FORM 2
The Patents Act 1970
(39 of 1970) &
The Patent Rules 2003 COMPLETE SPECIFICATION
(See Section 10 and rule 13)
TITLE OF THE INVENTION:
DISPLAY DEVICE FOR BA TTERY OFERATED BREAKER TESTING
DEVICES

APPLICANT:
LARSEN & TOUBRO LIMITED
L&T House, Ballard Estate, P.O. Box, No. 278,
Mumbai, 400 001, Maharashtra . INDIA.
PREAMBLE OF THE DESCRIPTION:
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED


A) TECHNICAL FIELD
[0001] The present invention generally relates to display devices and particularly to graphical display devices in portable, hand held devices such as testing devices. The present invention more particularly relates to graphical display devices in battery operated testing devices such as handheld testing devices for switching devices like circuit breakers.
B) BACKGROUND OF THE INVENTION
[0002] In the portable handheld devices which are basically battery operated, the power consumption is a main concern. The use of display unit in such devices limits its operation time, as it increases the power consumption. The display devices used in the portable handheld devices and in the portable electronic appliances; consume a large fraction of the total power expended to operate them. For these reasons, the designers and the manufacturers of the electronic information display devices seek methods for managing the power consumption of the display devices in the information processing devices more efficiently. More over they search for less expensive and simpler designs that avoid unnecessary use of battery to support a particular feature and component.
[0003] The power conservation is always desirable in any form and in any equipment. But with the handheld devices and the battery operated devices, its importance has increased immensely. The length of time that a battery will last depends on how much power is consumed by its receiver. The Longer the battery life, the lesser is the
2

operating cost. When the life of the battery used in the hand held devices are increased, the portable battery operated hand held devices may be used for long time thereby increasing the convenience of the users. Thus it is critical for the successful marketing of the display units in handheld devices that it consumes a minimum amount power for display.
[0004] The hand held circuit breaker testing devices are carried to the field. The display unit in the testing devices plays an important part as it provides user interface to select test parameters manually. The adjustment of the intensity of the display devices frequently in the testing units requires relatively high consumption of battery power. The consequence of increased power consumption is that the hand held testing device must be replaced and/or recharged more frequently than desirable. Hence there is a need to reduce the power consumption by the display unit to increase the display life and also to enhance the operating time of the device
[0005] The Korean Patent numbered KR 4094646A discloses a method for reducing power consumption of a graphic accelerator and a display, particularly for reducing power consumption of a battery caused by different elements of a display circuit while a device display is in a standby mode or in a partial display mode.
[0006] The US Patent numbered US 5089928 discloses a processor controlled circuit breaker trip system having reliable status display. It includes a battery as a secondary power source after a trip terminates the power to the system. The battery provides power to the latch and the LCD so that the cause of the trip may be displayed during a power fault.
3

[0007] Thus none of the prior art devices and currently available devices discloses a method for efficient power management for the display unit in the portable hand held devices, circuit breaker test instruments.
[0008] Moreover a display unit in the battery operated testing devices consumes large power even if any key is not pressed for a long period of time. More over the operator of these testing units takes too much time to access the menu keys and select the particular parameter. Hence there is a need to develop an improved method to reduce the power consumption of the display unit when the display is not in use continuously for longer period of time. Also there is a need to display the graphical image of the electrical signals when used with testing devices and to make the user interface easier to save the menu access time.
C) OBJECTS OF THE INVENTION
[0009] The primary object of the present invention is to provide a low powered graphical display unit for portable handheld battery operated circuit breaker testing devices to reduce the power consumption by the display units.
[0010] Another object of the present invention is to provide a graphical display unit with selectable display intensity property to reduce power consumption in a battery operated circuit breaker testing device.
4

[0011] Yet another object of the present invention is to provide a graphical display unit with a graphical screen saver mode to increase the display period thereby increasing the life of the battery in a battery operated circuit breaker testing devices.
[0012] Yet another object of the present invention is to provide a graphical display unit with a facility to reduce the intensity of the display, when the display is not used continuously for long period of time.
[0013] Yet another object of the present invention is to provide a graphical display unit with a facility to select sleep mode to reduce power consumption thereby increasing the life of the display and the battery.
[0014] Yet another object of the present invention is to provide a graphical display unit with a key to wake up the display unit.
[0015] Yet another object of the present invention is to provide a graphical display unit with an enhanced viewing angle to enable the user to observe the data easily.
[0016] Yet another object of the present invention is to provide a graphical display unit in a battery operated hand held testing device to enable the graphical representation of the generated waveforms in the display unit.
[0017] Yet another object of the present invention is to provide a graphical display unit in a battery operated circuit breaker testing devices with a touch screen display to enable the user to draw arbitrary waveforms manually on the touch screen display.
5

[0018] Yet another object of the present invention is to provide a graphical display unit in a battery operated circuit breaker testing devices with a waveform format selection facility to enable the user to select the shape of a waveform for generating and feeding into the device to be tested.
[0019] Yet another object of the present invention is to provide a graphical display unit in a battery operated circuit breaker testing device with soft keys for navigating shorter menu to select waveforms and programmable parameters quickly.
[0020] Yet another object of the present invention is to provide a graphical display unit in battery operated circuit breaker testing device with a facility to select the programmable signal parameters from the predefined list of signals.
[0021] Yet another object of the present invention is to provide a graphical display unit in battery operated circuit breaker testing device with an indicator to show the selected external storage device.
[0022] Yet another object of the present invention is to provide a graphical display unit in battery operated circuit breaker testing device to enable a user to select a file command easily and efficiently.
[0023] Yet another object of the present invention is to provide a graphical display unit in battery operated circuit breaker testing device to indicate the battery charging condition.
6

[0024] Yet another object of the present invention is to provide a graphical display unit in battery operated circuit breaker testing device to indicate the test results in real time.
[0025] These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
D) SUMMARY OF THE INVENTION
[0026] The abovementioned shortcomings, disadvantages and problems are addressed herein and which will be understood by reading and studying the following specification.
[0027] The various embodiments of the present invention provide a graphical display unit for a hand held battery operated testing device for a circuit breaker. According to one embodiment of the present invention, a control and processing unit is connected to a key board through a control/data line to receive the user input to regulate a display driver to operate and display a data in a touch screen display. The user selects a menu through the key board. The display unit is supplied with an electric power from a battery. When any key is not pressed for a preset period, which may be arbitrarily set by the user, the controller will activate a screen saver mode to change the display mode of the touch display screen to screen saver mode thereby reducing the intensity of the screen to reduce the power consumption to enhance the life of a
7

battery and display. Further when any key is not pressed or the display is not used continuously for a longer period of time, which may be selected and set by the user, the controller switches off the display module.
[0028] A battery condition monitoring unit is connected to the control and processing unit and to the battery to detect the residual battery level and to transmit the detection result to the control and processing unit. The control and processing unit adjusts the power consumption by the display unit based on the received residual battery condition and adjusting the intensity of the display screen by selecting a suitable and appropriate a power down mode. A real time clock is provided to display the current time in hours-min-seconds format. A system interface is installed to communicatively connect the external device with the display unit. A touch screen is provided to enable the user to draw any arbitrary waveform so that a test signal with the input waveform may be generated by a test kit.
[0029] Thus the present invention reduces the power consumption of the display unit by controlling the intensity of display and selecting the power down modes when the display is not in use. Thus it not only increases the display life but also enhances the operating time of the device. The display unit also enables the user to display the graphical image of the electrical signals. Since the display may be used with the testing devices, it can show the generated waveform on the screen.-
[0030] The present invention simplifies the user interface. The display unit provides graphic screen where the user can select any waveform and signal parameters from the predefined list of signals. The present invention provides soft key to shorten the
8

menu navigation time thereby saving the menu access time. The display system has touch screen whereby the user can draw any arbitrary waveform so that a signal with the input waveform is selected and used for testing a circuit breaker to be generated by test kit.
[0031] The various embodiments of the present invention provide low powered display unit for the battery operated testing devices. The display device enables the user to select a suitable display intensity to reduce the power consumption. The display device has a screen saver mode to reduce the intensity of the display thereby increasing the life of the display and battery operating time. The display also has a sleep mode to reduce the power consumption of the display when not in use and a display wake up function to activate the display when required. The display has a wide viewing angle to enable the user to observe the data at any angle without strain and difficulty. The display provides an indication of the selected external storage device, battery charging condition and real time. The display device enables the user to select a file command from the displayed menu easily.
[0032] These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
E) BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:
9

[0034] FIG.l illustrates a functional block diagram of the display unit used in the battery operated hand held testing devices for circuit breakers according to one embodiment of the present invention.
[0035] Although specific features of the present invention are shown in some drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention.
F) DETAILED INSCRIPTION OF THE INVENTION
[0036] In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense.
[0037] The various embodiments of the present invention provide a graphical display unit for a hand held battery operated testing device for a circuit breaker. According to one embodiment of the present invention, a control and processing unit is connected to a key board through a control/data line to receive the user input to regulate a display driver to operate and display a data in a touch screen display. The user selects
10

a menu through the key board. The display unit is supplied with a power from a battery.
[0038] The key board has an UP arrow key, DOWN arrow key, ENTER key, ESC (escape) key, SOFT key and display OFF key. When any key is not pressed for a preset period, which may be arbitrarily set by the user, the controller will activate a screen saver mode to change the display mode of the touch display screen to screen saver mode thereby reducing the intensity of the screen to reduce the power consumption to enhance the life of a battery. Further when any key is not pressed or the display is not used continuously for a longer period of time which may be selected and set by the user, the controller switches off the display module. A soft key is pressed to reduce the menu tree to enable the user to select an option from the displayed menu list easily.
[0039] A battery condition monitor is connected to the control and processing unit and to the battery to detect the residual battery level and to transmit the detection result to the control and processing unit. The control and processing unit adjusts the power consumption by the display unit based on the received residual battery condition and adjusting the intensity of the display screen by selecting a suitable and appropriate a power down mode. The detected battery condition is also displayed on the display screen to enable the user to recognize the actual battery condition to enable or prompt the user to take suitable action. A real time clock is provided to display the current time in hours-min-seconds format. The real time clock is used to time stamp the test time and the results of the test process so that the results are stored in a memory like external storage memory with the time. The external memory also
11

stores the trip records that include not only the cause of the trip but also the trip time, count, time stamp etc. A system interface is installed to communicatively connect the external device with the display unit. The system interface is used to select the signal parameters for testing the circuit breakers easily. A touch screen is provided to enable the user to draw any arbitrary waveform so that a test signal with the input waveform may be generated by a test kit.
[0040] The display screen is formed with Organic Light Emitting Diodes (OLED) so that the need for the back light is eliminated thereby reducing the power consumption. The display has better light intensity and viewing angle due to the use of OLED.
[0041] FIG.l illustrates a functional block diagram of the display unit used in the battery operated hand held testing devices for circuit breakers according to one embodiment of the present invention. With respect to FIG.l, the display device has a control and processing unit 8 connected to a key board 6 through a control/data line 9 to receive the user input to regulate a display driver 7 to operate and display a data in a touch screen display 1. The user selects a menu through the key board 6. The display unit is supplied with a power from a battery 2.
[0042] The key board.6 has an UP arrow key, DOWN arrow key, ENTER key, ESC (escape) key, SOFT key and display OFF key. When any key is not pressed for a preset period, which may be arbitrarily set by the user, the control and processing unit 8 will activate a screen saver mode to change the display mode of the touch display screen 1 to screen saver mode thereby reducing the intensity of the screen 1 to reduce the power consumption to enhance the life of a battery 2. Further when any key is not
12

pressed or the display is not used continuously for a longer period of time which may be selected and set by the user, the control and processing unit 8 switches off the touch screen display 1. A soft key is pressed to reduce the menu tree to enable the user to select an option from the displayed menu list easily.
[0043] A battery condition monitor 3 is connected to the control and processing unit 8 and to the battery 2 to detect the residual battery level and to transmit the detection result to the control and processing unit 8. The control and processing unit 8 adjusts the power consumption by the display unit 1 based on the received residual battery condition and adjusting the intensity of the display screen 1 by selecting a suitable and appropriate a power down mode. The detected battery condition is also displayed on the display screen 1 to enable the user to recognize the actual battery condition to enable or prompt the user to take suitable action. A real time clock 4 is provided to display the current time in hours-min-seconds format. The real time clock 4 is used to time stamp the test time and the results of the test process so that the results are stored in a memory 5 like external storage device with the time. The external memory 5 also stores the trip records that include not only the cause of the trip but also the trip time, count, time stamp etc. A system interface 10 is installed to communicatively connect the external device with the display unit 1. The system interface 10 is used to select the signal parameters for testing the circuit breakers easily. A touch screen 1 is provided to enable the user to draw any arbitrary waveform so that a test signal with the input waveform may be generated by a test kit.
[0044] Thus the present invention provides a simple user interface to enable the user to select the signal parameters for testing the circuit breaker easily. The power
13

consumption of the display unit is reduced by controlling the intensity of display and selecting the power down modes when the display is not in use. Thus it not only increases the display life but also enhances the operating time of the device. The display unit also enables the user to display the graphical image of the electrical signals. Since the display may be used with the testing devices, it can show the generated waveform on the screen.
[0045] The present invention simplifies the user interface. The display unit provides graphic screen where the user can select any waveform and signal parameters from the predefined list of signals. The present invention provides soft key to shorten the menu navigation time thereby saving the menu access time. The display system has touch screen whereby the user can draw any arbitrary waveform so that a signal with the input waveform is selected and used for testing a circuit breaker to be generated by test kit.
[0046] The various embodiments of the present invention provide low powered display unit for the battery operated testing devices. The display device enables the user to select a suitable display intensity to reduce the power consumption. The display device has a screen saver mode to reduce the intensity of the display thereby increasing the life of the display and battery operating time. The display also has a sleep mode to reduce the power consumption of the display when not in use and a display wake up function to activate the display when required. The display has a wide viewing angle to enable the user to observe the data at any angle without strain and difficulty. The display provides an indication of the selected external storage
14

device, battery charging condition and real time. The display device enables the user to select a file command from the displayed menu easily.
G) ADVANTAGES OF THE INVENTION
[0047] Thus the present invention provides a simple user interface to enable the user to select the signal parameters for testing the circuit breaker easily. The power consumption of the display unit is reduced by controlling the intensity of display and selecting the power down modes when the display is not in use. Thus it not only increases the display life but also enhances the operating time of the device. The display unit also enables the user to display the graphical image of the electrical signals. Since the display may be used with the testing devices, it can show the generated waveform on the screen.
[0048] The present invention simplifies the user interface. The display unit provides graphic screen where the user can select any waveform and signal parameters from the predefined list of signals. The present invention provides soft key to shorten the menu navigation time thereby saving the menu access time. The display system has touch screen whereby the user can draw any arbitrary waveform so that a signal with the input waveform is selected and used for testing a circuit breaker to be generated by test kit.
[0049] The various embodiments of the present invention provide low powered display unit for the battery operated testing devices. The display device enables the user to select a suitable display intensity to reduce the power consumption. The
15

display device has a screen saver mode to reduce the intensity of the display thereby increasing the life of the display and battery operating time. The display also has a sleep mode to reduce the power consumption of the display when not in use and a display wake up function to activate the display when required. The display has a wide viewing angle to enable the user to observe the data at any angle without strain and difficulty. The display provides an indication of the selected external storage device, battery charging condition and real time. The display device enables the user to select a file command from the displayed menu easily.
[0050] Although the invention is described with various specific embodiments, it will be obvious for a person skilled in the art to practice the invention with modifications. However, all such modifications are deemed to be within the scope of the claims.

[0051] It is also to be understood that the following claims are intended to cover all of the generic and specific features of the present invention described herein and all the statements of the scope of the invention which as a matter of language might be said to fall there between.
Date: August 29, 2008. RAKESH PRABHU
Place: Bangalore. Patent Attorney
16

CLAIMS
WHAT IS CLAIMED IS:
1. A display device for testing devices, the device comprises:
A display screen;
A control and processing block connected to said display screen to regulate the
operation of said display screen;
A Keyboard connected to said control and processing block and to receive an
input from a user;
Wherein said control and processing block regulates the intensity of the
display screen based on the received input through the Key board.
2. The display device according to claim 1, wherein the control and processing block reduces the intensity of the display screen, when any key in the keyboard is not pressed for preset period of time.
3. The display device according to claim 1, wherein the control and processing block activates a screen saver mode, when any key in the key board is not pressed for preset period of time.
4. The display device according to claim 1, wherein the control and processing block activates the screen saver mode to reduce the intensity of the display screen.
17

5. The display device according to claim 1, wherein the control and processing block switches off the display screen, when any key is not pressed for a predetermined period.
6. The display device according to claim 1, wherein the control and processing block activates a power down mode in the display screen, when the "DIPLAY OFF" key in the key board is activated.
7. The display device according to claim 1, wherein the display screen is touch screen display.
8. The display device according to claim 7, wherein the touch screen display enables the user to draw waveforms with arbitrary shapes so that a signal with the drawn waveform shape is generated and used for testing.
9. The display device according to claim 1, wherein the key board includes Up arrow key, Down arrow key. ENTER key, escape (esc) key, soft key and display off key.
10. The display device according to claim 9, wherein the soft key in the key board is pressed to shorten menu navigation process thereby reducing the menu tree to enable the user to select an option quickly.
11. The display device according to claim 1, further comprises a user interface to provide connectivity between an external device find a display module.
18

12. The display device according to claim 1, wherein the display screen comprises organic light emitting diode (OLED).
Dated this the 29th day of August, 2008

Rakesh Prabhu,
Patent Agent, ALMT Legal,
No.2, Lavelle Road, Bangalore-560 001, INDIA

To,
The Controller of Patents,
The Patent office,

19