3) OBJECTS OF THE INVENTION:

The proposed invention is a method of implementation of 3D technology in the True Colour LED Video Displays for enabling 3D viewing on the LED screen. 3D viewing is a unique experience by itself. The uniqueness will be accentuated in respect of TV viewing, in movie applications and also in video conferencing and other mass communication applications.

4) BACKGROUND ART or PRIOR ART:

True colour LED displays are proven medium for Event coverage, Theatre backdrops, Advertisements, Mass communication and various other audio- visual applications for both indoor and outdoor environments. LED TVs in the real sense are bound to be a reality, especially for OOH applications. Similarly LED screens can be deployed for outdoor applications in drive-in theatres and for very large scale viewing.

The true colour LED displays are presently being utilized as 2D devices.

The following co-pending patent applications by the inventor describe the processes in detail for 2 typical applications of the true colour LED Displays viz. LED DigiPoster and LED TV :

Intelligent LED 'Poster' System - LED DigiPoster 2621/CHE/2008 dt 28.10.2008

LED TV 2141/CHE/2009 dt 04.09.2009

In another application, the True Colour LED Video Displays have been modularly integrated in such a way to visualize 3D effect by physical imputation of the third (depth) dimension. The LED screens function as back drops for Theatre applications, simulating 3D effects. The following co-pending patent application by the inventor describes the processes in detail for this typical application:

A 3D display / video backdrop comprising of

LED display for theatre stage or TV/FILM

Production studio 2523/CHE/2010A dt 30.08.2010

LCD and Plasma display devices are also being enhanced for 3D technology for home entertainment with limited view angle and viewing distance.

The present invention addresses larger screen sizes employing LED pixels with associated technological advantages of LEDs like high intensity, brightness, colour, contrast, sharpness of image, viewability from a distance, daylight visibility and wider view angles for 3D upgradation through this scheme.

5) SUMMARY OF THE INVENTION:

In this invention, the 3D viewing experience in respect of true colour LED displays is contemplated by deploying 'polarised' passive filters, both at the display as well as at the eye glasses.

The 3D viewing effect is brought about by hardware and software related to the display, content and auxiliaries like viewing glasses and the special purpose optical film / sheet that provides the auto- stereoscopic effect.

The perception of 'Depth' by the human opthalmic system is because of the fact that images of the object as perceived by the left eye and the right eye are distinctly different. The 'absorption' of these distinctly different images continuously by the human sensory system provides the feeling of depth and the 3D effect for all the objects of the world as we see them every moment of our lives.

In order to realise the '3D effect', the 'content' also needs to be specially prepared with special cameras. The principle behind this special content is true delineation of the images for select viewing by the left and right eyes with true attentive viewing at defined and designated speeds.

6) DESCRIPTION

True Colour LED display is organised in the form of rectangular matrix of LED pixels made up of either 3-in-l chip LED or a cluster of 3 or 4 leaded LEDs. Basically the Display enables text, animated graphics and videos to be viewed in 2D. By means of a suitable scheme, 2 orthogonally polarised films are affixed on alternate rows or columns enabling 3D visualization of the same through a pair of similarly polarised viewing glasses. The left eye sees rows covered with one film while the right eye sees those covered with the second film. This is the line interleaving polarization format in which the left and right images are reproduced on alternating lines. When viewed with the help of the polarised glasses, the 3D content is displayed in 3D and viewed in 3D.

The arrangement is shown in the Photographs / Pictures in the following section wherein the LED pixels are seen covered by the polarised film on columns.

7) INPUT FORMATS:

Three common formats are in use for 3D inputs:

Side-by-side 3D (Reduction of horizontal resolution): The screen of resolution 1280*720 will be having two 640*720 frames for the left and right eyes when it is horizontally polarized.

Top / Bottom 3D (Reduction of vertical resolution): It is a vertical resolution that is reduced by half as the images for the left and right eye are stored on top of each other in a single frame; the screen of resolution 1280*720 will be having two 1280*360 frames for the left and right eyes when it is vertically polarized.

Frame sequential (Reduction of temporal resolution or page flip): It consists of alternating frames wherein each successive frame carries the image meant for the one or the other eye.

Passive glasses are used for Side-by-side or Top / Bottom 3D inputs while Active glasses or shutter technology will be ideally suited for Frame sequential inputs.

Video processing

The video signal captured by different input interfaces is processed for de-interlacing; scaling, including sharpness improvement; and the frame rate conversion. This is followed by the display-signal-processing technologies, such as contrast, brightness and saturation. Finally display-specific signal processing functions are carried out.

8) PHOTOGRAPHS / PICTURES:

A rectangular screen of 6' (W) X 4' (H) with 6mm pitch and 288 X 192 pixel resolution with orthogonally polarised film affixed on alternate columns

9) TARGETED SPECIFICATIONS:

1. Indoors - Out Of Home (OOH)
Sizes Modular - Ranging from 51" up to 110" (for LED
TV configurations) or larger
Pixel 3-in-l chip LED (SMD)
Pixel Pitch 9mm, 6mm, 4mm and 3mm
Resolution (Typical) 288 x 192 6mm pixels on 6'x 4'board (85 "diagonal)
NoofchipLEDs 55296

2. Inputs Live 3D Camera , Cable or Stored 3Dcontent

3. Audio Supports Commercial Sound Systems

4. Installation Indoors : Uni-pole or Bi-Pole mounted

5. Content 3D content fed to display

6. Power Operates on 230V AC / Generator

The pixels of the LED display are made up of 3-in-l chip LEDs (surface mount devices -SMD) facilitating the fixing of the polarised film on the rows or columns convenient. With the availability of the SMD 3-in-l chip LEDs for indoor use only, the method is described with respect to indoor applications; however, the scope of this invention is not limited and for those skilled in the art, the same may be extended for outdoor applications as and when SMD chip LEDs are available for outdoor use.

10) CLAIMS:

We Claim:

1. A method of viewing 3D content on the conventional 2D True Colour LED Video Displays deploying polarised filtering films at both the display and the eye glasses.

2. The method of claim 1, wherein the conventional 2D True Colour LED Video Display is suitably modified by means of two orthogonally polarised films affixed on alternate rows or columns.

3. The method of claim 1, wherein the conventional 2D True Colour LED Video Display, with the attachment made as above, presents two different images to the viewer.

4. The method of claim 1, wherein a pair of polarised eye-glasses are deployed for viewing the display in 3D.

5. The method of claim 1, wherein the pair of polarised eye-glasses are similarly (orthogonally) polarised as on the display.

6. The method of claim 1, wherein the input to the display device is 3D content.

7. The method of claim 1, wherein, the pixels of the LED display are made up of 3-in-1 SMD chip LEDs facilitating the fixing of the polarised film on the rows or columns convenient.

8. The method of claim 1, wherein, with the present availability of the SMD 3-in-l chip LEDs for indoor use only, the method is described with respect to indoor applications; however, the scope of this invention is not limited and the same may be extended for outdoor applications as and when SMD chip LEDs are available for outdoor use.

9. The method of claim 1, summarises the scheme to experience 3D viewing on the True colour LED Video displays with passive polarised filters.