1) TITLE OF THE INVENTION:

A proprietary 4-in-1 (R-G-B-Y) Chip LED for 3D True colour LED pixel displays

2 OWNER OF PRODUCT AND ADDRESS:

Owner:
MIC Electronics Limited A Public Limited Company

Address:
A - 4/11, Electronic Complex, Kushaiguda, Hyderabad - 500 062 INDIA.

Email: info@mic.co.in
Tel:+91 40 27122222 Fax:+91 40 27133333
Field of research:
4-in-1 chip LED for LED 3D displays f %

3) OBJECTS OF THE INVENTION:

The objective of this invention is to develop a proprietary LED die and package for use in the manufacture of LED pixel 3D Displays. This is a 4-in-1 chip LED, an SMD type of device. In the conventional 3-in-1 chip LED, the R-G-B sub-pixels carry the colour information; by contemplating an additional - fourth - Yellow sub-pixel to carry depth data, the 4-in-1 chip LED so devised, enables the 3D content to be displayed in 3D and viewed in 3D with the help of a pair of glasses with filters for colour on one eye and depth on the other.

4) PRIOR ART:
3-in-1 chip LEDs are employed for pixel formation in the True colour LED displays; the chip LED contains the three (RGB) sub-pixels. (Alternately, discrete, leaded RGB LEDs are also used to form a single pixel). The pixel primarily carries colour information and virtually 68 trillion colour combinations can be realised with a 12-bit colour processing scheme.

These displays are in extensive use for 2D applications like DigiPoster, Out of Home (OOH) LED TV, Passenger Information display at Bus stations, Railway stations and Airports etc.

By a suitable scheme of a physical re-arrangement of these 2D displays with intervening gaps between screen segments, virtual 3D effects have been simulated and realised, which find application as theatre backdrops for stage / reality shows.

3D viewing schemes have also been implemented by the inventor, on the conventional 2D displays with suitable external add-on components under the following methods:

- passive polarised filters used both at the display and on the eye wear,
- active shutters, synchronised, both at the display and on the eye wear and
- an autostereoscopic method for viewing 3D without the need for glasses

With 3D content at the input, the LED displays enable 3D viewing experience to the viewer.

The following co-pending patent applications by the inventor describe the processes in detail for these typical applications of the true colour LED Displays:

Intelligent LED 'Poster" System - LED Digi Poster 2621/CHE/2008dt:28.10.2008
LED TV 2141/CHE/2009 dt:04.09.2009

A 3D display / video backdrop comprising of LED
display for theatre stage or TV/FILM Production rj523/CHE/2010Adt:30.08.2010 studio

3D Viewing experience through true colour LED 3782/CHE/2010 dt:10.12.2010 displays using passive polarised glasses

3D Viewing experience through true colour LED 3783/CHE/2010dt:10.12.2010 displays using active shutter glasses

3D Viewing experience through autostereoscopic 442/CHE/2011 dt:05.02.2011 true colour LED displays without using glasses

5) SHORTCOMINGS:
LED displays employing conventional 3-in-1 RGB chip LEDs are primarily 2D. In order to visualise 3D images on these screens, it is necessary to equip with external add-on components like filters or films on the screens, in addition to eye wear where necessary.

The present invention eliminates the need for such add-on arrangements on the display. The new and proprietary 4-in-1 chip package is used in the module manufacturing - in place of 3-in-1 chip - and the display enables 3D viewing. The eye wear is however, still needed; with filters for RGB on one part of the lens and for Yellow on the other part of the lens.

In addition, the displays enable a simultaneous 3D / 2D viewing facility optionally.

6) SUMMARY OF THE INVENTION:
This invention is aimed at developing a proprietary LED package for use in the manufacture of LED pixel 3D Displays. This is a 4-in-1 chip LED, an SMD type of device. The chip LED package is a proprietary design (of the inventor) fabricated at Everlight Electronics Taiwan. The conventional 3-in-1 chip LED contains the colour information in the R-G-B sub-pixels. The addition of a fourth sub-pixel (yellow) carrying depth data is contemplated within the same package which enables the content to be displayed both in colour and depth - making it real 3D. High resolution applications can be realised with close spacing of the LEDs in the pixel. Further, the package is black coated for restricting light pollution and providing a high contrast; the chip is also available with IP65 rated (option) for outdoor use.

7) BRIEF DESCRIPTION
True colour LED Displays are made up of LED modules as basic building blocks and several such modules stacked together form a big screen. A module, in turn, is a matrix form of organisation of LED pixels. LED pixels are realised either with a cluster of individual leaded R-G-B LEDs (3 or 4) or with single 3-in-1 chip LEDs (SMD). The displays so made, are 2D displays which can be used in place of various other 2D media products like LCD TVs / displays. To view 3D content on 2D LED displays, techniques have been developed which typically include the use of passive polarised (colour glasses, active shutter glasses or an autosterioscopic method of viewing 3D avoiding glasses. These techniques present two separate images of the same still / video frame for the two eyes, which are mixed in the human brain and conceptualized / visualised as a 3D image, adding the third dimension of depth as a perception.

In this invention, the depth data is also contemplated along with the colour information in the RGB sub-pixels by means of an additional sub-pixel (yellow). A proprietary new 4-in-1 chip LED with the four colours - Red, Green, Blue and Yellow - packaged in a single chip is developed (for the inventor) at Everlight Electronics Taiwan and used in the basic module manufacturing process to realise True colour 3D LED Displays . This LED Display enables simultaneous 2D / 3D viewing facility. When the 3D content is displayed, 3D images can be viewed comfortably with the help of glasses. Without the glasses, images on the screen can be viewed in 2D with the same eye comfort. This option is a useful feature because with other methods, a screen showing 3D content can be visualised as 3D only by wearing glasses; and without glasses the display does not make any meaningful image.

The yellow sub-pixel has been accommodated along with the existing three sub-pixels RGB of the 3-in-1 chip LED. Further, the chip LED package is also designed for optional environmental protection to the grade of IP65 for use in outdoors. The package is black bodied to arrest light pollution and also result in a high contrast.

8) TARGETED APPLICATIONS:
This chip is designed for use in manufacture of True colour 3D LED Display boards for indoor (like Simulation, Training and remote monitoring in Aerospace and Medical applications, in movie theatres, OOH LED TVs in Corporate / Government offices, Clubs and resorts, shopping malls etc) or outdoor applications (like billboards, drive-in-theatres, mass communications applications for information / entertainment etc).

9) TARGETED SPECIFICATIONS -
Make custom built at Everlight
Package Size 3.2 mm X 3.2 mm square
Die size 2.2 mm X 2.2 mm
No of pins 6 (Dual in line Surface Mount type)

10) CLAIMS:
I/We Claim:

1. A proprietary make of a 4-in-1 (R-G-B-Y)chip LED, in surface mount device (SMD) package fabricated at Nichia corporation Japan, for use in the manufacture of the True colour LED 3D Displays employing 4 sub pixels - 3 for colour (RGB) and one for depth (Y).

2. The proprietary 4-in-1 (R-G-B-Y) chip LED of claim 1 facilitates a method for viewing 3D content on the True colour LED Displays, devised by using the proprietary Nichia make 4-in-1 chip LED, in place of the conventional 3-in-1 RGB chip LED containing the colour information in the R-G-B sub pixels.

3. The proprietary 4-in-1 (R-G-B-Y) chip LED of claim 1 where in the colour information of the image is contained in the RGB sub pixels while the depth data is contemplated by means of the Yellow sub-pixel.

4. The proprietary 4-in-1 (R-G-B-Y) chip LED of claim 1 where in the addition of a fourth sub pixel (yellow) with depth data enables enjoyable viewing of the 3D content on the display.

5. The proprietary 4-in-1 (R-G-B-Y)chip LED of claim 1 where in eye wear is needed for viewing the 3D display, with filters for RGB on one eye and for Yellow on the other eye.

6. The proprietary 4-in-1 (R-G-B-Y)chip LED of claim 1 where in simultaneous viewing option for 2D or 3D is possible with the True Colour LED display - 3D by wearing glasses and 2D without glasses, both with the same degree of eye comfort.

7. The proprietary make of the 4-in-1 (R-G-B-Y)chip LED of claim 1 where in, the chip LED package is also designed with option for IP65 environmental protection enabling its use for outdoor applications as well.

8. The proprietary 4-in-1 (R-G-B-Y)chip LED of claim 1 where in the True colour LED 3D Displays developed are deployed in several applications like Movie theatres, Clubs / resorts and Training / Simulation in medical / aerospace applications etc in indoors and Drive-in-theatres and Billboards for outdoors.

9. The proprietary 4-in-1 (R-G-B-Y)chip LED of claim 1 where in a Pixel Pitch of 9mm and resolution of 256 X 144 pixels are realisable on a 110" Diagonal (8'X 4.5') True colour LED Display in LED TV configuration with an Aspect Ratio of HD(16:9).

10. The proprietary 4-in-1 (R-G-B-Y)chip LED of claim 1 where in the present invention eliminates the need for additional work on the display screen like fixing filters etc to present 3D content to enable viewing in 3D.