DESCRIPTION
Title of Invention: IMAGE DISPLAY SYSTEM, DISPLAY DEVICE AND
SHUTTER GLASSES
Technical Field
[000l]
The present invention relates to an image display
system, a display device and shutter glasses which are
configured to combine a display device displaying multiple
images different from each other in a time-sharing manner
with shutter glasses worn by a viewer, and which presents a
stereoscopic image to the viewer in synchronization with
switchover of the images in the display device side and by
opening and closing left and right shutter lenses of the
shutter glasses, and particularly relates to an image
display system, a display device and shutter glasses which
control opening and closing timing of the shutter lenses by
allowing intermittent communication between the display
device and the shutter glasses.
Background Art
[0002]
It is possible to present a stereoscopic image
displayed stereoscopically to a viewer by displaying an
image having a parallax to left and right eyes. One method
of presenting the stereoscopic image includes those which
present the image with the parallax to both eyes after the
viewer wears glasses having special optical characteristics.
[0003]
For example, a time-sharing stereoscopic image display
system are configured to combine a display device displaying
multiple images different from each other in a time-sharing
manner with shutter glasses worn by a viewer. The display
device alternately displays a right eye image and a left eye
image on a screen in a very short cycle. In contrast, the
shutter glasses worn by the viewer include a shutter
mechanism configured to have liquid crystal lenses
respectively for a left eye portion and a right eye portion.
While the left eye image is displayed, in the shutter
glasses, the left eye portion of the shutter glasses
transmits light and the right eye portion blocks the light.
In addition, while the right eye image is displayed, the
right eye portion of the shutter glasses transmits light and
the left eye portion blocks the light (for example, refer to
PTLs 1 to 3). That is, the display device displays the left
eye image and the right eye image in a time-sharing manner
and the shutter glasses select the image using the shutter
mechanism in synchronization with display switchover of the
display device so as to present the stereoscopic image to
the viewer.
[0004]
In the time-sharing stereoscopic image display system,
when displaying the left eye image and the right eye image
in the time-sharing manner, it is necessary to separate the
left eye image and the right eye image from each other so as
not to cause crosstalk. In general, the display device
notifies the shutter glasses of switchover timing of the
left eye image and the right eye image such that based on
the notification, the shutter glasses switch over the images
and synchronize opening and closing of the left and right
shutter lenses (for example, refer to'PTL 4).
[ooos]
Considering that a user views a stereoscopic image in
the user's favorite indoor place, it is preferable that the
shutter glasses be a wireless type, in other words, a
battery drive type. In wireless communication between the
display device and the shutter glasses, it is possible to
use infrared communication or a wireless network such as
IEEE802.15.4. The latter wireless network is a two-way
communication, which also enables data communication from
the shutter glasses to the display device. For example,
Japanese Patent Application No. 2009-276948 already assigned
to the present applicant discloses an image display system
using the wireless network.
[0006]
The wireless network needs high power consumption as
compared to the infrared communication. For this reason, a
battery is under excessive burden if the display device
notifies the timing at every opening and closing of the
shutter lenses and the shutter glasses always wait for
reception of the notification. In contrast, a method can be
considered in which the shutter glasses periodically receive
a packet for synchronization processing from the display
device so as to synchronize the opening and closing of the
shutter lenses with the timing of the packet reception. In
this case, the shutter glasses, without waiting for the
reception at all times, performs reception processing only
at the timing before and after receiving the packet, and
stops the reception operation during the other period, which
enables reduction in power consumption.
[0007]
However, during the period when the shutter glasses
stop the reception operation, even if the packet is
transmitted from the display device, there is a problem in
that the shutter glasses cannot receive the packet. For
example, when the display device switches over display modes
from a 3D display to a 2D display, it is necessary to notify
the shutter glasses of the display mode switchover and to
leave both of the left and right shutter lenses in an open
state. If the shutter glasses intermittently receive the
notification, the display mode switchover cannot be notified
immediately most of the time. That is, the display device
has no choice but to wait until the shutter glasses perform
the next reception operation so as to notify the shutter
glasses of the display mode switchover. As a result, the
notification is not given to the shutter glasses until the
display mode is switched over in the display device side,
the operation of the shutter glasses remains not to be
switched over, whereby causing the viewer wearing the
shutter glasses to be unable to view a normal display image.
[0008]
Of course, in a case where the display mode is switched
over from a 2D display to a 3D display in the display device
side, or even when it is switched over to a display mode
other than 2D and 3D, similar problems arise.
Citation List
Patent Literature
[0009]
PTL 1: Japanese Unexamined Patent Application
Publication No. 9-138384
PTL 2: Japanese Unexamined Patent Application
Publication No. 2000-36969
PTL 3: Japanese Unexamined Patent Application
Publication No. 2003-45343
PTL 4: Japanese Unexamined Patent Application
Publication No. 2010-287956
Summary of Invention
Technical Problem
[OOlO]
An object of the present invention is to provide an
image display system, a display device and shutter glasses
which are excellent and capable of preferably presenting a
stereoscopic image to a viewer by opening and closing left
and right shutter lenses of the shutter glasses in
synchronization with switchover of images in the display
device side.
[OOll]
Another object of the present invention is to provide
an image display system, a display device and shutter
glasses which are excellent and capable of preferably
presenting a stereoscopic image to a viewer wearing the
shutter glasses by allowing intermittent communication
between the display device and the shutter glasses so as to
synchronize opening and closing timing of shutter lenses
with image switchover.
[0012]
Still another object of the present invention is to
provide an image display system, a display device and
shutter glasses which are excellent and enable a viewer
wearing the shutter glasses to view an appropriate display
image by notifying the shutter glasses intermittently
receiving the notification without delay in display mode
switchover, when the display mode is switched over in the
display device side.
Solution to Problem
[0013]
This application is made in view of the above problems.
According to the invention of claim 1, there is provided an
image display system including
shutter glasses having shutter lenses, a communication
unit, and a controller controlling an opening and closing
operation of the shutter lenses according to a display mode
of an image to be viewed through the shutter lenses; and
a display device having a display unit with a plurality
of display modes, and a communication unit communicating
with the shutter glasses,
in which the display device, when recognizing in
advance that the display mode is to be switched over in the
display unit, commands the shutter glasses to perform a
reception operation, and transmits a packet notifying
switchover of the display mode to the shutter glasses at the
point of time when the display mode is switched over in the
display unit, and
in which the shutter glasses perform reception
processing using the communication unit according to the
command from the display device, and start control of the
opening and closing operation of the shutter lenses in
response to the display mode which has been switched over,
according to the received packet notifying that the display
mode has been switched over.
[0014]
Note that, herein the term "system" refers to one in
which a plurality of devices (or functional modules for
realizing specific functions) are logically aggregated, and
it does not matter whether or not each of the devices or the
functional modules are present inside a single housing.
[0015]
According to the invention of claim 2, in the image
display system according to claim 1, the shutter glasses
cause the communication unit to perform intermittent
reception. The display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, using a period when the shutter glasses cause the
communication unit to perform a reception operation,
transmits a packet commanding the shutter glasses to perform
the reception operation to the shutter glasses, and in
contrast the shutter glasses, when receiving the command
packet, start continuous reception or shorten a cycle of the
intermittent reception.
[0016]
- 9 -
SP316980
According to the invention of claim 3, in the image
display system according to claim 2, the shutter glasses
restart the intermittent reception on the original cycle
after starting the continuous reception or shortening the
cycle of the intermittent reception, when receiving the
packet notifying the switchover of the display mode from the
display device, or when the packet cannot be received within
a predetermined period.
[0017 1
According to the invention of claim 4, in the image
display system according to claim 1, the display device,
when recognizing in advance timing when the display mode is
to be switched over in the display unit, commands the
shutter glasses to perform the reception operation in
response to the timing, and in contrast the shutter glasses
perform the reception operation of the communication unit in
response to the timing, according to the command received
from the display device.
[0018]
According to the invention of claim 5, in the image
display system according to claim 1, the shutter glasses
cause the communication unit to intermittently perform
reception. The display device, when the display unit
displays a stereoscopic image, using a reception period of
intermittent reception in the shutter glasses side,
transmits a synchronization packet including information
required for the opening and closing operation of the
shutter lenses in synchronization with display of the
stereoscopic image, and in contrast the shutter glasses
control the opening and closing operation of the shutter
lenses based on content described in the synchronization
packet. In addition, the display device, when recognizing
in advance that the display mode is to be switched over in
the display unit, transmits the synchronization packet
including the command of the reception operation to the
shutter glasses, using a period when the shutter glasses
cause the communication unit to perform the reception
operation.
[0019]
According to the invention of claim 6, in the image
--
display system according to claim 5, the display device
describes information related to the current display mode of
the display unit, in the synchronization packet, and in
contrast the shutter glasses start controlling the opening
and closing operation of the shutter lenses in response to
the display mode indicated by the received synchronization
packet.
[0020]
In addition, according to the invention of claim 7,
there is provided a display device including
a display unit having a plurality of display modes; and
a communication unit communicating with shutter glasses,
in which the display device, when recognizing in
advance that the display mode is to be switched over in the
display unit, command the shutter glasses to perform a
reception operation, and
the display device transmits a packet notifying
switchover of the display mode to the shutter glasses at the
point of time when the display mode is switched over in the
display unit.
[0021]
According to the invention of claim 8, the shutter
glasses cause the communication unit to intermittently
perform reception. The display device in the display device
according to claim 7, when recognizing in advance that the
display mode is to be switched over in the display unit,
uses a period when the shutter glasses cause the
communication unit to perform a reception operation, and
transmits a packet commanding the shutter glasses to perform
the reception operation to the shutter glasses.
[0022]
According to the invention of claim 9, the shutter
glasses cause the communication unit to intermittently
perform reception. Then, the display device in the display
device according to claim 7, when the display unit displays
a stereoscopic image, using a reception period of
intermittent reception in the shutter glasses side,
transmits a synchronization packet including information
required for the opening and closing operation of the
shutter lenses in synchronization with display of the
stereoscopic image. In addition, the display device, when
recognizing in advance that the display mode is to be
switched over in the display unit, transmits the
synchronization packet including the command of the
reception operation with respect to the shutter glasses,
using a period when the shutter glasses cause the
communication unit to perform the reception operation.
[0023]
According to the invention of claim 10, the display
device according to claim 9, describes information related
to the current display mode of the display unit, in the
synchronization packet.
[0024]
In addition, according to the invention of claim 11,
there are provided shutter glasses including
shutter lenses;
a communication unit and;
shutter glasses including a controller controlling an
opening and closing operation of the shutter lenses
according to a display mode in a display device, which is
viewed through the shutter lenses,
in which the shutter glasses perform reception
operation using the communication unit according to
notification from the display device in advance that the
display mode is to be switched over, and start control of
the opening and closing operation of the shutter lenses in
response to the display mode which has been switched over,
according to the received packet notifying that the display
mode has been switched over from the display device.
[0025]
According to the invention of claim 12, the shutter
glasses according to claim 11 cause the communication unit
to perform intermittent reception, and the communication
unit starts continuous reception or shortens a cycle of the
intermittent reception according to the notification from
the display device in advance that the display mode is to be
switched over.
[0026]
According to the invention of claim 13, the
communication unit in the shutter glasses according to claim
12 restarts the intermittent reception on the original cycle
after starting the continuous reception or shortening the
cycle of the intermittent reception, when receiving the
packet notifying the switchover of the display mode from the
display device, or when the packet cannot be received within
a predetermined period.
[0027]
According to the invention of claim 14, in the shutter
glasses according to claim 11, the controller, during a
reception period of the intermittent reception using the
communication unit, receives a synchronization packet
including information required for the opening and closing
operation of the shutter lenses in synchronization with
display of a stereoscopic image, from the display device,
and controls the opening and closing operation of the
shutter lenses based on content described in the
synchronization packet. In addition, the communication unit
starts continuous reception or shortens a cycle of the
intermittent reception according to the reception of the
synchronization packet containing the information notifying
in advance that the display mode is to be switched over.
[0028]
According to the invention of claim 15, information
related to the current display mode of the display unit is
described in the synchronization packet. The controller in
the shutter glasses according to claim 14 starts control of
the opening and closing operation of the shutter lenses in
response to the display mode indicated by the received
synchronization packet.
Advantageous Effects of Invention
[0029]
According to the present invention, it is possible to
provide an image display system, a display device and
shutter glasses which are excellent and capable of
preferably presenting a stereoscopic image to a viewer
wearing the shutter glasses by controlling opening and
closing timing of shutter lenses by allowing intermittent
communication between the display device and the shutter
glasses.
[0030]
In addition, according to the present invention, it is
possible to provide an image display system, a display
device and shutter glasses which are excellent and enable a
viewer wearing the shutter glasses to view an appropriate
display image, the shutter glasses intermittently receiving
the notification without any delay in display mode
switchover in the display device side.
[0031]
Other objects, features and advantages of the present
invention will become apparent from more detailed
description based on embodiments to be described later and
the accompanying drawings.
Brief Description of Drawings
[0032]
[Fig. 11 Fig. 1 is a diagram schematically illustrating
a configuration example of an image display system.
[Fig. 21 Fig. 2 is a diagram illustrating an internal
configuration example of a display device 11.
[Fig. 31 Fig. 3 is a diagram illustrating an internal
configuration example of shutter glasses 13.
[Fig. 4A] Fig. 4A is a diagram illustrating a control
operation of the shutter glasses 13 in synchronization with
a display period of a left eye image L of the display device
11.
[Fig. 4B] Fig. 4B is diagram illustrating a control
operation of the shutter glasses 13 in synchronization with
a display period of a right eye image R of the display
device 11.
[Fig. 51 Fig. 5 is a timing chart illustrating an
operation example in a case where control of the shutter
glasses 13 is delayed in switchover of a display mode in the
display device 11 side.
[Fig. 61 Fig. 6 is a timing chart illustrating an
operation example in a case where the display device 11
recognizes switchover of a display mode in advance, and
commands the shutter glasses 13 to perform continuous
reception.
[Fig. 71 Fig. 7 is a timing chart illustrating an
operation example in a case where the display device 11
recognizes switchover of a display mode in advance, and
notifies the shutter glasses 13 of timing of commanding the
switchover of the display mode.
[Fig. 81 Fig. 8 is a timing chart illustrating an
operation example in a case where the display device 11
recognizes switchover of a display mode in advance, and
commands the shutter glasses 13 to shorten a cycle of
intermittent reception.
[Fig. 91 Fig. 9 is a flowchart illustrating a
processing procedure for the display device 11 to transmit a
synchronization packet to the shutter glasses 13.
[Fig. 101 Fig. 10 is a flowchart illustrating a
processing procedure for the display device 11 to command
the shutter glasses 13 to switch over to a display mode.
[Fig. 11A] Fig. 11A is a flowchart illustrating a
processing procedure for the shutter glasses 13 to receive a
synchronization packet from the display device 11.
[Fig. 11B] Fig. 11B is a flowchart illustrating a
processing procedure for the shutter glasses 13 to receive a
synchronization packet from the display device 11.
[Fig. 11C] Fig. 11C is a flowchart illustrating a
processing procedure for the shutter glasses 13 to receive a
synchronization packet from the display device 11.
Description of Embodiments
[0033]
Hereinafter, embodiments of the present invention will
be described in detail with reference to the drawings.
[0034]
Fig. 1 schematically illustrates a configuration
example of an image display system. The image display
system is formed from a display device 11 corresponding to a
three-dimensional display (stereoscopic view) in combination
with shutter glasses 13 having a shutter mechanism,
respectively in a left eye portion and a right eye portion.
Radio signal are transmitted and received between a
communication unit 12 built in a main body of the display
device 11 and the shutter glasses 13.
[0035]
Infrared communication is frequently used in
communication between the display device and the shutter
glasses, but in the present embodiment, a wireless network
by way of radio communication such as IEEE802.15.4 is used.
In a system configuration example illustrated in Fig. 1, the
display device 11 and the shutter glasses 13 perform
communication one-to-one, but the communication unit 12 of
the display device 11 is operated as an access point,! and it
is possible to accommodate multiple shutter glasses
respectively operated as a terminal station. Since the
wireless network is a two-way communication, data
communication can be performed from the shutter glasses 13
to the display device 11 and thereby an available service
through the system can be broadened. The image display
system using the wireless network is disclosed in Japanese
Unexamined Patent Application Publication No. 2009-276948
that is already assigned to the present applicant, for
example.
[0036]
The display device 11 used in a stereoscopic image
display is not limited to a particular method. For example,
in addition to the traditional cathod ray tube (CRT) display,
plasma display panels (PDP), liquid crystal displays (LCD)
and electro-luminescence (EL) panels can be used. Among
them, in the liquid crystal displays, an active matrix type
is general in which a thin file transistor (TFT) is arranged
for every pixel. In TFT liquid crystal displays, each pixel
is driven by writing a video signal for each scanning line
from the top of a screen to the bottom and the display is
performed by blocking or transmitting light emitted from
Backlight using each pixel.
[0037]
Fig. 2 illustrates an internal configuration example of
the display device 11. Herein, each unit will be described.
[0038]
An antenna 204 supplies received broadcast signals to a
tuner circuit 205. In the present embodiment, broadcast
waves received by the antenna 204 are subject to an MPEG2-TS
system. On the assumption that the MPEG2-TS is applied to
an environment where a data transmission error occurs in
broadcasting or communication networks, it has also been
adopted in Japanese domestic digital broadcasting (digital
satellite broadcasting, digital terrestrial broadcasting,
digital cable television (CATV)). In the MPEG2-TS, multiple
transport stream (TS) packets having the fixed length of 188
bytes are aggregated to configure a transport stream. The
transport stream includes packets of information described
in a section type table, such as program specific
information (PSI) and service information (SI). Out of
these, the PSI is information required (control information
for tuning) in a system which receives the information by
selecting a desired broadcasting channel, and there are
sections such as a program association table (PAT), program
map table (PMT), network information table (NIT) and
condition access table (CAT). PID of video, audio and
additional data, and a program clock reference (PCR)
included in the corresponding program is described in the
PMT .
[0039]
In accordance with command from a CPU 219, the tuner
circuit 205 performs tuning, that is, channel selection, on
broadcasting waves of a predetermined channel, and outputs
the received data to a subsequent moving picture expert
group (MPEG) decoder 206.
[0040]
First, the MPEG decoder 206 demodulates the received
data which has been digitally modulated, obtains the (abovedescribed)
transport stream, interprets the transport stream,
divides it into AV data compressed by means of MPEG2 and
program information, and transmits the later to the CPU 219
via an internal bus 218. Subsequently, the MPEG decoder 206
divides real-time AV data compressed by means of an MPEG2
system into compressed video data and compressed audio data.
Then, the MPEG decoder 206 reproduces the original video
signal through extension processing by means of MPEG2 with
respect to the video data, and performs pulse code
modulation (PCM) decode with respect to the audio data so as
to combine them with an additional sound for a reproduced
audio signal.
[0041]
A reproduced video signal is input to a video signal
processing circuit 207, and required signal processing is
performed. Thereafter, on-screen display information
generated by a graphic generation circuit 208 when necessary
is superimposed thereon, and is output for display on a
display panel 210 using a panel drive unit 209. Signal
processing performed by a video signal processing circuit
207 includes image correction processing (to be described
later) such as chromaticity point correction and brightness
reduction. In addition, the reproduced audio signal is
input to an audio signal processing circuit 211,. and
required signal processing is performed. Thereafter, the
signal is amplified in a desired audio level using an audio
amplifying circuit 212 so as to drive a speaker 213.
[0042]
As an available route for AV data of the display device
11 other than broadcasting waves, it is possible to
exemplify an external source device (not illustrated)
connected to a high-definition multimedia interface (HDMI)
terminal 214 which is a digital interface, or a case where
stereoscopic vision content distribution is received via the
Internet. An HDMI reception circuit 215 allocates an input
signal from the external source device connected to the HDMI
terminal 214 to the video signal processing circuit 207 and
the audio signal processing circuit 211. In addition, a
signal received from a network terminal 217 is input to the
MPEG decoder 206 via a communication processing circuit 216
of the Ethernet (registered trademark) interface. The MPEG
decoder 206 extracts the video signal and the audio signal
from the received signal (hereinafter, the same).
[0043]
The video signal processing circuit 207, upon
processing the video signal, generates a frame switchover
signal required for controlling the opening and closing of
shutter lenses in the shutter glasses 13, and inputs it to a
control circuit 224. The control circuit 224, based on
timing of the input frame switchover signal, generates a
synchronization packet including synchronization information
for synchronizing the opening and closing timing of left and
right shutter lenses in the shutter glasses 13 side with a
display image. As the synchronization information, for
example, information in synchronization with a clock and a
value of a counter for counting display frames are described.
The synchronization packet is wirelessly transmitted from a
communication unit 203 to the shutter glasses 13 using radio
wave communication.
[0044]
A control code infrared-transmitted in such a manner
that a user remotely manipulates the display device 11 using
a remote controller 223 is received by a remote controller
reception unit 222. In an example illustrated in Fig. 2, an
infrared communication method is used in the remote
manipulation, but the above-described communication unit 203
may be shared in use for the remote manipulation.
[0045]
In order to entirely control the display device 11,
circuit components are provided such as a central processing
unit (CPU) 219, a flash read only memory (ROM) 220 and a
dynamic random access memory (DRAM) 221. The control code
received by the remote controller reception unit 222 (or
communication unit 203) is transferred to the CPU 219 via
the internal bus 218. The CPU 219 controls an operation of
the display device 11 by decoding the control code. In
addition, the CPU 219 interprets the program information
sent by the MPEG decoder 206 via the internal bus 218. In
the present embodiment, switchover timing of the display
mode in the video signal is described in a descriptor under
PMT control within PSI (to be described later). The CPU 219,
when interpreting the descriptor and obtaining the
switchover timing of the display mode, notifies the control
circuit 224 of the result via the internal bus 281. The
control circuit 224, when the switchover timing of the
display mode is notified, generates control information
commanding the shutter glasses 13 to switch over the mode,
and transmits it from the communication unit 203 to the
shutter glasses 13 by containing it in the (above-described)
synchronization packet, for example.
[0046]
Fig. 3 illustrates an internal configuration example of
the shutter glasses 13. The shutter glasses 13 include a
communication unit 305 transmitting and receiving a radio
signal to and from the display device 11 using the radio
wave communication, a controller 306, left eye shutter lens
308 and right eye shutter lens 309 which are respectively
formed from liquid crystal materials, a shutter drive
circuit 307 and a self-propulsion clock 310 configured to
have a crystal oscillator.
[0047]
The synchronization packet is wirelessly transmitted
from the display device 11 to the shutter glasses 13. Each
synchronization packet includes control information which
commands the switchover of the display mode in addition to
information related to the opening and the closing timing of
the left and right shutter lenses 308 and 309 in the shutter
glasses 13 side. The communication unit 305, when receiving
the synchronization packet, inputs it to the controller 306.
The controller 306 interprets content described in the
synchronization packet, synchronizing clock frequency of the
self-propulsion clock 310 with the display device 11 side,
and matches a value of the counter used for opening and
closing the shutter lenses 308 and 309. Then, the
controller 306 determines the opening and closing timing of
the respective left and right shutter lenses 308 and 309,
based on the values of the clock and the counter, until the
subsequent synchronization packet is received, and controls
the opening and closing operation of the respective left and
right shutter lenses 308 and 309 via the shutter drive
circuit 307.
[0048]
The shutter glasses 13 are driven by a battery (not
illustrated) as a main power source. For each instance when
the capacity of the battery is reduced, it is necessary to
replace the battery or to charge the battery. The
communication unit 305 is configured to perform an
intermittent reception operation so as not to waste power
for signal reception.
[0049]
Fig. 4A illustrates a control operation of the shutter
glasses 13 in synchronization with a display period of a
left eye image L of the display device 11. As illustrated
in Fig. 4A, during the display period of the left eye image
L, if the left eye shutter lens 308 is set to an open state
and the right eye shutter lens 309 is set to a closed state
according to the synchronization packet wirelessly
transmitted from the display device 11 side, display light
LL based on the left eye image L reaches only the left eye
of a viewer. In addition, Fig. 4B illustrates a control
operation of the shutter glasses 13 in synchronization with
a display period of a right eye image R. As illustrated in
Fig. 4B, during the display period of the right eye image R,
if the right eye shutter lens 309 is set to an open state
and the left eye shutter lens 308 is set to a closed state,
display light RR based on the right eye image R reaches only
the right eye of a viewer.
[0050]
The display device 11 alternately displays the left eye
image L and the right eye image R for each field when in a
3D display mode. In the shutter glasses 13 side, the left
and right shutter lenses 308 and 309 alternately perform the
opening and closing operation in synchronization with image
switchover for each field of the display device 11. The
image displayed by the display device 11 is stereoscopically
recognized by the viewer since the left eye image L is
combined with the right eye image R.
[0051]
In addition, when in a 2D display mode, the display
device 11 does not perform the switchover between the left
eye image L and the right eye image R. Then, in the shutter
glasses 13 side, a shutter clear state, that is, an open
state of both of the left and right shutter lenses 308 and
309 is maintained.
[0052]
As described above, the wireless network such as
IEEE802.15.4 is used for the communication between the
display device 11 and the shutter glasses 13. With regard
to the communication protocol of a logical layer or above in
IEEE802.15.4, Zigbee Alliance performs the formulation of
the specification.
[0053]
The wireless network needs higher power consumption as
compared to the infrared communication. If the display
device 11 performs the notification of the timing for every
opening and closing of the shutter lenses 308 and 309, and
the shutter glasses 13 cause the communication unit 305 to
always wait for the reception power consumption for the
signal reception is increased, which results in frequent and
inconvenient replacement or charging of the battery.
[0054]
Therefore, in the present embodiment, the
synchronization packet is transmitted from the display
device 11 to the shutter glasses 13, with a longer interval
than the opening and closing cycle of the shutter lenses 308
and 309, and the shutter glasses 13 stops the reception
operation for most of the non-reception period of the
synchronization packet, whereby reducing the power
consumption. The synchronization packet contains
information related to the timing, cycle, phase, and opening
and closing time of the shutter lenses which serve as a
reference for the opening and closing control of the shutter
lenses. In the shutter glasses 13 side, the controller 306
synchronizes with the self-propulsion clock 310 based on the
content described in the synchronization packet. Then, the
opening and closing of the shutter lenses are controlled
using the self-propulsion clock 310 until the subsequent
synchronization packet is received.
[0055]
Herein, in order to prevent crosstalk, it is necessary
to suppress a phase shift between the switchover timing of
the image in the display device 11 and the opening and
closing timing of the shutter lenses 308 and 309 in the
shutter glasses 13, to 100 microseconds or less. Accuracy
available with a general crystal oscillator is 30 ppm and
deviation of maximum 30 microseconds occurs in one second.
Therefore, after the synchronization is implemented by the
synchronization packet, the synchronization of the selfpropulsion
clock 310 can be maintained in the shutter
glasses 13 side for three seconds. Accordingly, it is
sufficient if the display device 11 would transmit the
synchronization packet once in three seconds. However, when
considering that a packet reception error may occur for some
reason, or when the synchronization packet is transmitted to
multiple shutter glasses in the broadcasting manner, a
retransmission request cannot be made even if the shutter
glasses 13 fail to receive the packet. For these reasons,
it is considered that the transmission cycle of the
synchronization packet is reasonably set to a maximum of one
second. It is sufficient if the shutter glasses 13 perform
the intermittent reception in the cycle of one second so as
to receive the synchronization packet.
[0056]
In addition, the display device 11 has some display
modes and the shutter glasses 13 has to control the opening
and closing operation of the shutter lenses 308 and 309 in
response to the display mode. In a case of the 3D display
mode where the left eye image and the right eye image are
displayed in the time-sharing manner, the opening and
closing operation of the shutter lenses 308 and 309 have
opposite phases in the shutter glasses 13 side (For example,
refer to Figs. 4A and 4B). In addition, in a case of the 2D
display mode, both of the shutter lenses 308 and 309 are
kept in a shutter clear state, that is, in an open state, in
the shutter glasses 13 side. Further, the display device 11
has a dual view mode which changes a display for each
looking direction at a screen. In this case, in the shutter
glasses 13 side, the shutter lenses 308 and 309 have to be
in the same phase in an odd number of screens or the shutter
lenses 308 and 309 have to be in the same phase in an even
number of screens.
[0057]
The display device 11 transmits the control information
notifying the switchover of the display mode to the shutter
glasses 13 and thereby controls the opening and closing of
the shutter lenses 308 and 309 in the shutter glasses 13
side. If the control information is contained in the
synchronization packet, the shutter glasses 13 are not
necessarily provided with an individual reception period in
order to acquire the synchronization information and the
control information, which can lengthen a period during
which reception operation can be stopped.
[0058]
However, if the shutter glasses 13 perform the
intermittent reception and stop the reception operation most
of the time, the control information cannot be notified
until the subsequent reception period even if the display
mode is switched over in the meantime in the display device
11 side. Since the notification is not available in the
cycle of a maximum of one second, there is a possibility
that the control of the shutter glasses 13 may be delayed.
In this case, the viewer wearing the shutter glasses 13 can
no longer view a normal display image.
[0059]
Fig. 5 illustrates an operation example in a case where
the control of the shutter glasses 13 is delayed in the
switchover of the display mode in the display device 11 side.
[0060]
The broadcasting wave received by the antenna 240 and
the tuner circuit 205 of the display device 11 is a
transport stream where TS packets such as PMT are
multiplexed to the video (refer to the above).
[0061]
As illustrated in Fig. 5, the display mode is switched
over from 3D to 2D in the middle of the video signal. A
case where the display mode is switched over from 3D to 2D
in the video signal, for example, includes the end time of a
3D broadcast program and the time of an inserted 2D display
CM during the 3D broadcast program. In addition, if the CM
ends, it is contemplated that the display mode returns to 3D.
The digital broadcasting standards can be formulated such
that the information about the switchover timing of the
display mode in the video signal is described in the
descriptor under the PMT control.
[0062]
In the display device 11, if the above-described
transport stream is received, the MPEG decoder 206 divides
it into the AV data and the program information, further
divides the AV data into the compressed video data and the
compressed audio data, and reproduces the original video
signal through the extension processing by means of MPEG2
with respect to the video data. If the video signal is
switched over from 3D to 2D, after only the delay time
(decode delay) resulting from the decoding in the MPEG
decoder 206, the display on the display panel 210 is
switched over from 3D to 2D.
[0063]
In addition, the shutter glasses 13 perform the
intermittent reception by providing the reception period at
intervals of several times per second. The display device
11 transmits the synchronization packet in response to the
timing of the reception period.
[0064]
From the time when the video signal is switched over
from 3D to 2D, the display device 11 can recognize the
change in the display mode after the delay time. However,
since the shutter glasses 13 perform the intermittent
reception, if the display device 11 does not wait for the
timing which causes the shutter glasses 13 to perform the
reception operation, the display device 11 cannot command
the shutter glasses 13 to switch over to the display mode.
The command can be performed by superimposing it on the
synchronization packet.
[0065]
The shutter glasses 13, upon receiving the command of
the switchover to 2D display mode, enter the shutter clear
state in response to the 2D display. After the 3D display
is switched over to the 2D display on the display panel 210
of the display device 11, the shutter glasses 13 cannot
enter the shutter clear state until the timing when the
shutter glasses perform the subsequent reception operation.
Thus, a mismatch period may occur between the shutter
opening and closing operation of the shutter glasses 13 and
the screen display. During the mismatch period, the viewer
wearing the shutter glasses 13 cannot view a normal display
image.
[0066]
Therefore, in order not to cause such a mismatch period
to occur, the present inventors propose a method where the
display device 11 recognizes the switchover timing of the
display mode in advance and commands the shutter glasses 13
to perform the continuous reception. Since the shutter
glasses 13 start the continuous reception in advance, even
if the display device 11 transmits the packet commanding the
switchover of the display mode at any timing when the
display is switched over from 3D to 2D on the display panel
210, the shutter glasses 13 can receive the packet and can
switch over to the appropriate shutter opening and closing
control.
[0067]
The shutter glasses 13, if the continuous reception is
commanded using the synchronization packet, start the
continuous reception and wait for the signal reception from
the display device 11. Then, the shutter glasses 13, upon
receiving the packet commanding the switchover of the
display mode, immediately switch over to the shutter opening
and closing control in response to the display mode. In
addition, the shutter glasses 13, upon receiving the packet
commanding the switchover of the display mode, stop the
continuous reception and return to the original state of the
intermittent reception.
[0068]
Here, the packet commanding the switchover of the
display mode may have the same format as the periodically
transmitting synchronization packet or may have a different
format. Alternately, the switchover of the display mode may
be notified by setting a flag commanding the switchover of
the display mode in the synchronization packet.
[0069]
As the error processing, the shutter glasses 13, when
the packet does not come from the display device 11, even if
the continuous reception is continued for a certain period
only, may stop the continuous reception and may return to
the original state of the intermittent reception.
[0070]
In addition, for the error processing purpose, the
display device 11 may be configured to insert the
information indicating the current display mode into the
periodically transmitting synchronization packet. The
shutter glasses 13, upon receiving the synchronization
packet, check whether or not the shutter opening and closing
control currently performed by the shutter glasses 13
matches the display mode indicated in the packet. Then, in
a case of the mismatch, the shutter glasses 13 immediately
switch over to the shutter opening and closing control in
response to the display mode. Although time lag occurs in
the switchover of the shutter opening and closing operation,
the shutter glasses 13 can follow the switchover of the
display mode within a cycle of the intermittent reception.
[0071]
Fig. 6 illustrates an operation example in a case where
the display device 11 recognizes the switchover of the
display mode in advance, and commands the shutter glasses 13
to perform the continuous reception.
[0072]
The broadcasting wave received by the antenna 240 and
the tuner circuit 205 of the display device 11 is the
transport stream where TS packets such as PMT are
multiplexed to the video (described above). As illustrated
in Fig. 6, the display mode is switched over from 3D to 2D
in the middle of the video signal. A case where the display
mode is switched over from 3D to 2D in the video signal, for
example, includes the end time of a 3D broadcast program and
the time of an inserted 2D display CM during the 3D
broadcast program. In addition, if the CM ends, it is also
contemplated that the display mode returns to 3D (the same
as above) .
[0073]
The digital broadcasting standards can be formulated
such that the information about the switchover timing of the
display mode in the video signal is described in the
descriptor under the PMT control. Furthermore, in other
words, the digital broadcasting standards can be formulated
such that information (hereinafter, referred to as "advance
display mode change information") notifying the switchover
of the display mode in advance is described in the
descriptor under the PMT control, before only a
predetermined period of time (for example, several seconds)
when the display mode of the video signal is switched over.
[0074]
In the display device 11, if the above-described
transport stream is received, the MPEG decoder 206 divides
it into the video signal and the program information such as
the PMT. Then, the content described in the descriptor
under the PMT control is interpreted by the CPU 219, and
based on the above-described advance display mode change
information, it is possible to recognize in advance that the
video signal is switched over from the 3D display mode to
the 2D display mode after a predetermined period of time has
elapsed from the current time. However, the method where
the display device 11 recognizes in advance the switchover
of the display mode of the video signal is not limited to a
particular method, and the method of using the descriptor
under the PMT control is only an example.
[0075]
On the other hand, the shutter glasses 13 perform the
intermittent reception by providing the reception period at
intervals of several times per second. The display device
11, upon recognizing in advance that the video signal is
switched over from the 3D display mode to the 2D display
mode after a predetermined period of time has elapsed from
the current time, transmits the synchronization packet
containing the command of the continuous reception (or an
advance notification of the switchover of the display mode)
in response to the timing when the shutter glasses 13
perform the subsequent reception operation. Then, the
shutter glasses 13, if the continuous reception is commanded
using the synchronization packet (or if the switchover of
the display mode is notified in advance), start the
continuous reception and wait for the signal reception from
the display device 11.
[0076]
Thereafter, in the display device 11, the MPEG decoder
206 continues to perform the decoding of the AV data divided
from the transport stream and reproduces the original video
signal through the extension processing by means of MPEG2
with respect to the video data. Then, if the video signal
is switched over from 3D to 2D, after only the delay time
resulting from the decoding in the MPEG decoder 206, the
display on the display panel 210 is switched over from 3D to
At this time, the shutter glasses 13 perform the
continuous reception. Therefore, the display device 11,
upon recognizing the change in the display mode after the
above-described delay time following the switchover from 3D
to 2D in the video signal, can transmit the packet
commanding the shutter glasses 13 to immediately switch over
to the display mode. The packet commanding the switchover
of the display mode may have the same format as the
periodically transmitting synchronization packet or may have
a different format. Alternately, the switchover of the
display mode may be notified by setting a flag commanding
the switchover of the display mode in the synchronization
packet.
[0078]
The shutter glasses 13, upon receiving the command of
the switchover to 2D display mode, enter the shutter clear
state in response to the 2D display. That is, almost
simultaneously with the switchover of the display from 3D to
2D on the display panel 210 in the display device 11 side,
the shutter glasses 13 enter the shutter clear state.
Accordingly, unlike the operation example illustrated in Fig.
5, the mismatch period does not occur between the shutter
opening and closing operation of the shutter glasses 13 and
the screen display. Therefore, the viewer wearing the
shutter glasses 13 can always view a normal display image
even if the switchover of the display mode occurs.
[0079]
The shutter glasses 13, upon receiving the packet
commanding the switchover of the display mode, stop the
continuous reception and return to the original state of the
intermittent reception, which reduces the power consumption
due to the signal reception.
[0080]
Fig. 9, in the operation example illustrated in Fig. 6,
illustrates a processing procedure for the display device 11
to transmit the synchronization packet to the shutter
glasses 13, in a flowchart manner. The illustrated
processing procedure can be realized, for example, in a form
where the CPU 11 executes a predetermined program code.
[0081]
The display device 11, using timer interrupt, enters a
waiting state (WAIT) for the transmission of the
periodically transmitting synchronization packet (Step S91).
The timer interrupt is assumed to occur immediately before
the timing of transmitting the synchronization packet.
[0082]
Then, ih the control circuit 224, generation processing
of the payload of the synchronization packet is performed
(Step S92).
[0083]
Subsequently, it is checked whether or not the advance
information on performing the switchover of the display mode
is present (Step S93). The CPU 219 may interpret the
program information transferred from the MPEG decoder 206
and may check whether or not the advance display mode change
information is described in the descriptor under the PMT
control (described above) .
[0084]
Herein, in a case where the advance information is
present in which the switchover of the display mode is to be
performed (Yes in Step S93), in the control circuit 224, the
command of the continuous reception (or information
notifying in advance that the display mode is to be switched
over) is included inside the payload of the synchronization
packet generated in Step S92 (Step S94). In addition, in a
case where the advance information is not present in which
the switchover of the display mode is to be performed (No in
Step S93), the process in Step S94 is skipped.
[0085]
Then, in the control circuit 224, the generated payload
is packetized in the synchronization manner by attaching
header information or the like (Step S95), and then the
synchronization packet is transmitted from the communication
unit 203 to the shutter glasses 13 (Step S96).
[0086]
In addition, Fig. 10, in the operation example
illustrated in Fig. 6, illustrates a processing procedure
for the display device 11 to command the shutter glasses 13
to switch over to the display mode, in a flowchart manner.
The illustrated processing procedure can be realized, for
example, in a form where the CPU 11 executes a predetermined
program code.
[0087]
If the video signal is switched over from 3D to 2D,
after only the delay time resulting from the decoding in the
MPEG decoder 206, the display device 11 side recognizes that
the display mode is switched over, and the display on the
display panel 210 is switched over from 3D to 2D.
[0088]
In response to this, the control circuit 224 generates
the packet commanding the switchover of the display mode
(Step SlOl), and the packet is transmitted from the
communication unit 203 to the shutter glasses 13 (Step S102).
[0089]
In addition, Figs. 11A to 11C, in the operation example
illustrated in Fig. 6, illustrate a processing procedure for
the shutter glasses 13 to receive the synchronization packet
from the display device 11, in a flowchart manner. The
illustrated processing procedure can be realized, for
example, in a form where the controller 306 executes a
predetermined program code.
[0090]
The shutter glasses 13, using the timer interrupt,
enter the waiting state (WAIT) for the synchronization
packet by periodically providing the reception period (Step
S1101). The timer interrupt is assumed to occur immediately
before the timing of transmitting the synchronization packet.
[0091]
Subsequently, the shutter glasses 13 set the timer in
order to end the reception period (Step 51102) and start the
reception operation in the communication unit 305 (Step
S1103). Then, until the timer set in Step S1102 is timed
out (No in Step S1105), the shutter glasses 13 cause the
communication unit 305 to wait for the reception.
[0092]
When the synchronization packet cannot be received
until the time-out (No in Step S1104, Yes in Step S1105),
the reception operation of the communication unit 305 is
stopped (Step S1106) and the process returns to Step SllOl
so as to wait for the timing of the subsequent periodical
reception.
[0093]
In addition, when the synchronization packet can be
received until the time-out (Yes in Step S1104), after the
reception operation of the communication unit 305 is stopped
(Step SllOI), the synchronization processing with the
display device 11 is performed, based on the information
described in the synchronization packet (Step S1108). In
the synchronization processing, the synchronization of the
self-propulsion clock 310 is implemented, based on the
content described in the synchronization packet. As a
result, the timing, cycle and phase for opening and closing
the shutter lenses 308 and 309 are configured to
appropriately meet the timing when the left eye image and
the right eye image are switched over on the display panel
210 of the display device 11 side.
[0094]
Subsequently, the shutter glasses 13 check whether or
not the command of the continuous reception is contained in
the received synchronization packet (Step S1109).
[0095]
If the command of the continuous reception is not
contained in the received synchronization packet (No (1) in
Step S1109), the process returns to Step SllOl so as to wait
for the timing of the subsequent periodical reception.
[0096]
Alternatively, if the command of the continuous
reception is not contained in the received synchronization
packet (No (2) in Step S1109), with reference to the
information indicating the current display mode inserted
into the synchronization packet, it is checked whether or
not a change in the display mode occurs in the display
device 11 side (Step S1110). Then, when the change in the
display mode occurs (Yes in Step SlllO), the shutter glasses
13 perform the processing corresponding thereto (Step S1111)
and then the process returns to Step SllOl so as to wait for
the timing of the subsequent periodical reception. For
example, in a case of the switchover from the 3D display
mode to the 2D display mode, the shutter glasses 13 enter
the open mode from the normal mode.
[0097]
In addition, if the command of the continuous reception
is contained in the received synchronization packet (Yes in
Step S1109), the shutter glasses 13 set the timer in order
to end the waiting for the command reception of the
switchover of the display mode (Step S1112) and start the
continuous reception operation in the communication unit 305
(Step S1113). Then, until the timer set in Step S1102 is
timed out (No in Step S1115), the shutter glasses 13 cause
the communication unit 305 to wait for the reception.
[00981
When the switchover command of the display mode cannot
be received until the time-out (No in Step S1114, Yes in
Step S1115), the continuous reception operation of the
communication unit 305 is stopped (Step S1117) and the
process returns to Step SllOl so as to wait for the timing
of the subsequent periodical reception.
[0099]
In addition, when the switchover command of the display
mode can be received until the time-out (Yes in Step S1114),
after the continuous reception operation of the
communication unit 305 is stopped (Step S1116) and the
shutter glasses 13 perform the processing corresponding to
the display mode after the switchover (Step S1111). For
example, in a case of the switchover from the 3D display
mode to the 2D display mode, the shutter glasses 13 enter
the open mode from the normal mode. Thereafter, the shutter
glasses 13, returning to Step S1101, wait for the timing of
the subsequent periodical reception.
[OlOO]
As an alternative method illustrated in Fig. 6, a
method is considered in which the display device 11
recognizing the switchover of the display mode in advance
notifies the shutter glasses 13 of the timing when
commanding the shutter glasses 13 to switch over to the
display mode. Fig. 7 illustrates an operation example in a
case where the display device 11 recognizes the switchover
of the display mode in advance and notifies the shutter
glasses 13 of the timing when commanding the shutter glasses
13 to switch over to the display mode.
[OlOl]
The display device 11, upon recognizing in advance that
similarly to the above-described example, the video signal
is switched over from the' 3D display mode to the 2D display
mode, transmits the synchronization packet containing the
notification of the switchover timing of the display mode to
the shutter glasses 13 in response to the timing when the
shutter glasses 13 perform the subsequent reception
operation.
[0102]
In contrast, the shutter glasses 13, if the
synchronization packet notifies the switchover timing of the
display mode, start the reception operation in response to
the timing and wait for the reception.
[0103]
Thereafter, if the video signal is switched over from
3D to 2D, in the display device 11, after only the delay
time resulting from the decoding in the MPEG decoder 206,
the display on the display panel 210 is switched over from
3D to 2D.
[0104]
The shutter glasses 13 perform the reception operation
in response to the timing when the display mode is switched
over. Therefore, the display device 11, upon recognizing
the change in the display mode after the above-described
delay time from the point when the video signal is switched
over from 3D to 2D, can transmit the packet commanding the
shutter glasses 13 to immediately switch over to the display
mode.
[0105]
The shutter glasses 13, upon receiving the switchover
command to the 2D display mode, enter the shutter clear
state in response to the 2D display. That is, almost
simultaneously with the switchover of the display from 3D to
2D on the display panel 210 in the display device 11 side,
the shutter glasses 13 enter the shutter clear state.
Accordingly, similarly to the operation example illustrated
in Fig. 6, the mismatch period does not occur between the
shutter opening and closing operation of the shutter glasses
13 and the screen display. Therefore, the viewer wearing
the shutter glasses 13 can always view a normal display
image even if the switchover of the display mode occurs.
[0106]
Thereafter, the shutter glasses 13 continue to perform
the intermittent reception, which reduces the power
consumption due to the signal reception.
[0107]
In addition, as an alternative method illustrated in
Fig. 6, a method is considered in which the display device
11 recognizing the switchover of the display mode in advance
commands the shutter glasses 13 to shorten the cycle of the
intermittent reception. Fig. 8 illustrates an operation
example in a case where the display device 11 recognizes the
switchover of the display mode in advance and commands the
shutter glasses 13 to shorten the cycle of the intermittent
reception.
[0108]
The display device 11, upon recognizing in advance that
similarly to the above-described example, the video signal
is switched over from the 3D display mode to the 2D display
mode, transmits the synchronization packet containing the
command to shorten the cycle of the intermittent reception
(or the advance notification of the switchover of the
display mode) to the shutter glasses 13 in response to the
timing when the shutter glasses 13 perform the subsequent
reception operation.
[0109]
In contrast, the shutter glasses 13, when receiving the
command to shorten the cycle of the intermittent reception
in the packet (or if the switchover of the display mode is
notified in advance), shorten the cycle and perform the
intermittent reception.
[OllO]
Thereafter, if the video signal is switched over from
3D to 2D, in the display device 11, after only the delay
time resulting from the decoding in the MPEG decoder 206,
the display on the display panel 210 is switched over from
3D to 2D.
[Olll]
Since the shutter glasses 13 perform the intermittent
reception in a short cycle, the display device 11, upon
recognizing the change in the display mode, can transmit the
packet commanding the shutter glasses 13 to switch over to
the display mode within a shorter period of time than that
in the operation example illustrated in Fig. 5.
[0112]
The shutter glasses 13, upon receiving the switchover
command to the 2D display mode, enter the shutter clear
state in response to the 2D display. That is, if the
display on the display panel 210 is switched over from 3D to
2D in the display device 11 side, the shutter glasses 13
enter the shutter clear state within a relatively short
period of time. Unlike the operation examples in Figs. 6
and 7, the mismatch period occur between the shutter opening
and closing operation of the shutter glasses 13 and the
screen display, but the mismatch period is shorter than that
of the operation example illustrated in Fig. 5.
[0113]
Thereafter, the shutter glasses 13 return the cycle of
the intermittent reception to the original state, which
reduces the power consumption due to the signal reception.
[0114]
The open mode for keeping the left and right shutter
lenses 308 and 309 in the open state is the same as the
state in which the power supply of the shutter glasses 13 is
turned off. A modification example may be considered in
which when the video signal is switched over from the 3D
display mode to the 2D display mode, the display device 11
command the shutter glasses 13 to switch off the power
supply rather than to command the open mode. However, in
some cases, such as a case where the CM of the 2D display
mode ends and the main television program restarts, the
display mode returns to the 3D display mode thereafter.
However, if the power supply is switched off, the shutter
glasses 13 cannot return to the normal mode. Therefore, the
descriptor under the PMT control may have the description as
to whether the video signal has either the ended 3D display
mode or the temporary 2D display mode, together with the
information about the timing when the video signal is
switched over to the 2D display mode. When the video signal
is switched over from the 3D display mode to the 2D display
mode, the display device 11 may command the shutter glasses
13 to switch off the power supply if it is the former ended
3D display mode, and may command the shutter glasses 13 to
have the open mode if it is the latter temporary 2D display
mode.
[0115]
A disadvantage, as illustrated in Fig. 5, that the
mismatch period may occur between the shutter opening and
closing operation of the shutter glasses 13 and the screen
display can be solved in such a manner as the operation
examples illmtrated in Figs. 6 to 8, the shutter glasses 13
are kept in the reception waiting state at the timing when
the display mode of the video signal is switched over, so as
to be capable of receiving the command of the display mode
switchover from the display device 11.
[0116]
The display device 11 interprets the descriptor under
the PMT control, which is multiplexed into the received
transport stream or otherwise using any other method,
recognizes, in advance before a predetermined period of time
(for example, several seconds), that the display mode of the
video signal is to be switched over, and on this basis,
keeps the shutter glasses 13 in the reception waiting state.
Then, if the display mode of the video signal is actually
switched over, the display device 11 can command the shutter
glasses 13 to immediately switch over to the display mode.
[0117]
The shutter glasses 13, upon receiving the advance
command from the display device 11, start the continuous
reception, or shorten the cycle of the intermittent
reception, or otherwise wait for the designated timing to
start the reception operation. Then, the shutter glasses 13
switch over the operation mode of the shutter lenses 308 and
309 in response to the display mode switchover command
received from the display device 11. In addition, the
shutter glasses 13, upon receiving the display mode
switchover command received from the display device 11, stop
the operation of the continuous reception or the
intermittent reception in the short cycle, and restart the
intermittent reception in the original cycle.
[0118]
In the operation examples illustrated in Figs. 6 to 8,
it may be determined in view of the maximum cycle of
transmitting the synchronization packet how earlier the
display device 11 has to recognize the switchover of the
display mode before the display mode of the video signal is
switched over. In addition, the timing when the display
device 11 recognizes that the display mode of the video
signal has been switched over, and commands the shutter
glasses 13 to switch over to the display mode may be
determined in view of the timing of advance acquisition of
the switchover information or the synchronization packet
transmission cycle for each device and its processing period
of time.
[0119]
In Figs. 6 to 8, a case is exemplified where the video
signal is switched over from the 3D display mode to the 2D
display mode and in response thereto, the shutter glasses 13
are switched over from the normal mode in which the left and
right shutter lenses 308 and 309 are alternately opened and
closed to the shutter clear state, that is, the open mode in
which the left and right shutter lenses 308 and 309 are kept
in the open state. Conversely, similarly even in a case
where the video signal is switched over from the 2D display
mode to the 3D display mode and in response thereto, the
shutter glasses 13 are caused to return from the open mode
to the normal mode, the display device 11 recognizing the
switchover of the display mode in advance may perform the
timing notification commanding the shutter glasses 13 to
perform the continuous reception and to switch over to the
display mode, or may perform the command to shorten the
cycle of the intermittent reception. Furthermore, the
operations described using Figs. 6 to 8 can be similarly
applied to a case of the switchover to the dual mode or
returning from the dual mode.
Industrial Applicability
[0120]
Hitherto, with reference to the specific embodiments,
the present invention has been described. However, it is
apparent that those skilled in the art can modify or
substitute the embodiments in the range without departing
from the gist of the present invention.
[0121]
In the present specification, as the display device
displaying the mutually different multiple images in the
time-sharing manner, the embodiments using the liquid
crystal display have been mainly described, but the gist of
the present invention is not limited thereto. For example,
in addition to the traditional cathod ray tube (CRT) display,
the plasma display panel (PDP) and the electro-luminescence
(EL) panel can be used.
In addition, in the present specification, as
communication means for connecting the shutter glasses and
the display device, for example, the embodiments adopting
the wireless network such as IEEE802.15.4 have been mainly
described, but the gist of the present invention is not
limited thereto. If the two-way communication is available
between the shutter glasses and the display device, it is
also possible to adopt other radio communication
technologies or wired communication technologies.
[0123]
A series of processing in the embodiments described in
the present specification can be performed by either
hardware or software. In a case where the processing is
realized by the software, a computer program in which the
processing procedure in the software is described in a
computer-readable format is installed and executed in a
predetermined computer. In addition, the computer program
can also be incorporated into products such as the liquid
crystal display.
[0124]
In short, the present invention has been disclosed by
way of example, and the described content of the present
specification cannot be limitedly construed. In order to
determine the gist of the present invention, it has to refer
to claims.
Reference Signs List
[0125]*
11 display device
12 communication unit
13 shutter glasses
203 communication unit
antenna
tuner circuit
MPEG decoder
video signal processing circuit
graphic generation circuit
panel drive unit
display panel
audio signal processing circuit
audio amplifier circuit
speaker
HDMI terminal
HDMI reception circuit
communication processing circuit
network terminal
inner bus
CPU
flash ROM
DRAM
remote controller reception unit
remote controller
communication unit
controller
shutter drive circuit
left eye shutter
right eye shutter
310 self-propulsion clock

- 59 -
CLAIMS
[Claim 1]
An image display system comprising:
shutter glasses having shutter lenses, a communication
unit, and a controller controlling an opening and closing
operation of the shutter lenses according to a display mode
of an image to be viewed through the shutter lenses; and
a display device having a display unit with a plurality
of display modes, and a communication unit communicating
with the shutter glasses,
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, commands the shutter glasses to perform a reception
operation, and transmits a packet notifying switchover of
the display mode to the shutter glasses at the point of time
when the display mode is switched over in the display unit,
and
wherein the shutter glasses perform reception
processing using the communication unit according to the
command from the display device, and start control of the
opening and closing operation of the shutter lenses in
response to the display mode which has been switched over,
according to the received packet notifying that the display
mode has been switched over.
[Claim 2]
The image display system according to claim 1,
wherein the shutter glasses cause the communication
unit to perform intermittent reception,
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, uses a period when the shutter glasses cause the
communication unit to perform a reception operation, and
transmits a packet commanding the shutter glasses to perform
the reception operation to the shutter glasses, and
wherein the shutter glasses, when receiving the command
packet, start continuous reception or shorten a cycle of the
intermittent reception.
[Claim 3]
The image display system according to claim 2,
wherein the shutter glasses restart the intermittent
reception on the original cycle after starting the
continuous reception or shortening the cycle of the
intermittent reception, when receiving the packet notifying
the switchover of the display mode from the display device,
or when the packet cannot be received within a predetermined
period.
[Claim 4]
The image display system according to claim 1,
wherein the display device, when recognizing in advance
timing when the display mode is to be switched over in the
display unit, commands the shutter glasses to perform the
reception operation in response to the timing, and
wherein the shutter glasses perform the reception
operation of the communication unit in response to the
timing, according to the command received from the display
device.
[Claim 5]
The image display system according to claim 1,
wherein the shutter glasses cause the communication
unit to intermittently perform reception,
wherein the display device, when the display unit
displays a stereoscopic image, using a reception period of
intermittent reception in the shutter glasses side,
transmits a synchronization packet including information
required for the opening and closing operation of the
shutter lenses in synchronization with display of the
stereoscopic image, and the shutter glasses control the
opening and closing operation of the shutter lenses based on
content described in the synchronization packet, and
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, transmits the synchronization packet including the
command of the reception operation to the shutter glasses,
using a period when the shutter glasses cause the
communication unit to perform the reception operation.
[Claim 6]
The image display system according to claim 5,
wherein the display device describes information
related to the current display mode of the display unit, in
the synchronization packet, and
wherein the shutter glasses start controlling the
opening and closing operation of the shutter lenses in
response to the display mode indicated by the received
synchronization packet.
[Claim 7]
A display device comprising:
a display unit having a plurality of display modes; and
a communication unit communicating with shutter glasses,
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, commands the shutter glasses to perform a reception
operation, and
wherein the display device transmits a packet notifying
switchover of the display mode to the shutter glasses at the
point of time when the display mode is switched over in the
display unit.
[Claim 8]
The display device according to claim 7,
wherein the shutter glasses cause the communication
unit to intermittently perform reception, and
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, uses a period when the shutter glasses cause the
communication unit to perform a reception operation, and
transmits a packet commanding the shutter glasses to perform
the reception operation to the shutter glasses.
[Claim 9]
The display device according to claim 7,
wherein the shutter glasses cause the communication
unit to intermittently perform reception,
wherein the display device, when the display unit
displays a stereoscopic image, using a reception period of
intermittent reception in the shutter glasses side,
transmits a synchronization packet including information
required for the opening and closing operation of the
shutter lenses in synchronization with display of the
stereoscopic image, and
wherein the display device, when recognizing in advance
that the display mode is to be switched over in the display
unit, transmits the synchronization packet including the
command of the reception operation with respect to the
shutter glasses, using a period when the shutter glasses
cause the communication unit to perform the reception
operation.
[Claim 10]
The display device according to claim 9,
wherein the display device describes information
related to the current display mode of the display unit, in
the synchronization packet.
[Claim 11]
Shutter glasses comprising:
shutter lenses;
a communication unit; and
shutter glasses including a controller controlling an
opening and closing operation of the shutter lenses
according to a display mode in a display device, which is
viewed through the shutter lenses,
wherein the shutter glasses perform reception operation
using the communication unit according to notification from
the display device in advance that the display mode is to be
switched over, and start control of the opening and closing
operation of the shutter lenses in response to the display
mode which has been switched over, according to the received
packet notifying that the display mode has been switched
over from the display device.
[Claim 12]
The shutter glasses according to claim 11, which cause
the communication unit to perform intermittent reception,
wherein the communication unit starts continuous
reception or shortens a cycle of the intermittent reception
according to the notification from the display device in
advance that the display mode is to be switched over.
[Claim 13]
The shutter glasses according to claim 12,
wherein the communication unit restarts the
intermittent reception on the original cycle after starting
the continuous reception or shortening the cycle of the
intermittent reception, when receiving the packet notifying
the switchover of the display mode from the display device,
or when the packet cannot be received within a predetermined
period.
[Claim 14]
The shutter glasses according to claim 11,
wherein the controller, during a reception period of
the intermittent reception using the communication unit,
receives a synchronization packet including information
required for the opening and closing operation of the
shutter lenses in synchronization with display of a
stereoscopic image, from the display device, and controls
the opening and closing operation of the shutter lenses
based on content described in the synchronization packet,
and
wherein the communication unit starts continuous
reception or shortens a cycle of the intermittent reception
according to .reception of the synchronization packet
containing the information notifying in advance that the
display mode is to be switched over.
[Claim 15]
The shutter glasses according to claim 14,
wherein information related to the current display mode
of the display unit is described in the synchronization
packet, and
wherein the controller starts control of the opening
and closing operation of the shutter lenses in response to
the display mode indicated by the received synchronization
packet.