Method of Implementing Global Illumination With OLED Displays

• US 20160284265A1
• Filed: 03/28/2016
• Published: 09/29/2016
• Est. Priority Date: 03/26/2015
• Status: Abandoned Application

• Current Assignee: eMagin Corporation (Samsung Electronics Co. Ltd.)
• Original Assignee: eMagin Corporation (Samsung Electronics Co. Ltd.)
• Inventors: Prache, Olivier
• Application Number:
  US15/082,869
• Publication Number:
  US 20160284265A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2203/12 spatial light modulator
• CPC Class Codes: G09G 2320/10 Special adaptations of display systems for operation with variable images
• CPC Class Codes: G09G 2380/12 Avionics applications
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays

Abstract

A method of implementing global illumination in an organic light emitting diode (OLED) display device utilizing an external shutter to reduce visual artifacts and motion blurring. The display device has a screen for displaying image data and a plurality of pixels each including an organic light-emitting diode. The method includes controlling emission of light from each light emitting diode along a path from the pixel to the screen. The shutter is coupled to the display device and has an on-time state, permitting light to pass therethrough, and an off-time state, blocking light from passing therethrough. The method includes loading image data into the plurality of pixels in raster scan order while the shutter is in the off-time state. The shutter is then switched to the on-time state to simultaneously allow emission of light from each pixel to pass therethrough. During the brief on-time state, image data is simultaneously displayed on the screen for the plurality of pixels thereby displaying the full image all at once.

Claims

1. A method of controlling emission of light in a display device which receives image data from a video source, the display device having a screen and comprising a plurality of pixels each including a light emitting element configured to emit light along a path from the pixel to the screen, the steps comprising:

a) providing a shutter disposed on the display device and operated to block emission of light from all pixels during a first portion video frame;

b) loading image data into each one of the plurality of pixels and controlling the light emitting element of each pixel based on the image data received during the first portion video frame; and

c) simultaneously enabling emission of light from each pixel through the shutter during a second portion video frame.

2. The method of claim 1 wherein the light-emitting element comprises an organic light emitting diode.

3. The method of claim 1 wherein the shutter is a mechanical light shutter.

4. The method of claim 1 wherein the shutter is an electro-optical light shutter.

5. The method of claim 4 wherein the electro-optical light shutter is a liquid crystal light valve.

6. The method of claim 5 wherein the liquid crystal light valve is a ferroelectric liquid crystal light valve.

7. The method of claim 1 wherein the shutter includes an off-time state during the first portion video frame and an on-time state during the second portion video frame.

8. The method of claim 7 wherein the off-time state of the shutter is non-transparent or closed.

9. The method of claim 7 wherein the on-time state of the shutter is transparent or open.

10. The method of claim 1 wherein the display is a microdisplay.

11. The method of claim 1 wherein the display is active matrix or passive matrix.

12. The method of claim 1 wherein the image data is loaded into the pixels in raster scan order.

13. The method of claim 1 further comprising a frame including the first portion video frame and the second portion video frame.

14. The method of claim 13 wherein the frame is 1/60 of a second.

15. A method of operating a display system in communication with a video source for receiving image data, comprising:

providing a display device having a screen for displaying image data, the display device having a plurality of pixels each including a light-emitting diode;

emitting light from each light emitting diode along a path from the pixel to the screen;

providing a shutter coupled to the display device having an on-time state and an off-time state, wherein the on-time state allowing transmission of light to pass therethrough and the off-time state blocking transmission of light from passing therethrough;

loading image data into the plurality of pixels in raster scan order until a full image is loaded;

switching the shutter from off-time state to the on-time state to simultaneously allow emission of light from each pixel to pass through the shutter; and

displaying the full image on the screen by simultaneously displaying image data for each of the plurality of pixels.

16. The method of claim 15 wherein the plurality of pixels comprise active-matrix organic light-emitting diodes.

17. The method of claim 15 wherein the shutter is a mechanical light shutter.

18. The method of claim 15 wherein the shutter is an electro-optical light shutter.

19. The method of claim 18 wherein the electro-optical light shutter is a liquid crystal light valve.

20. The method of claim 19 wherein the liquid crystal light valve is a ferroelectric liquid crystal light valve.