Image display apparatus

• US 20080122832A1
• Filed: 11/29/2006
• Published: 05/29/2008
• Est. Priority Date: 11/29/2006
• Status: Abandoned Application

• Current Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Chen, Shou Lung, Tsai, Chen-Jung
• Application Number:
  US11/605,526
• Publication Number:
  US 20080122832A1
• Time in Patent Office: Days
• US Class Current: 345/214
• CPC Class Codes: G09G 2310/0221 with use of split matrices G09G3/3644 and G09G3/3666 take precedence
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

Methods and apparatuses for image display are disclosed. There is provided an image display apparatus. The apparatus includes a plurality of display modules including display elements manufactured from different bins; a plurality of driving circuits providing different driving conditions for the display modules, at least one driving circuit for each display module; and a control circuit controlling the driving circuits to compensate each display module for variation of characteristics amongst modules of bins. The driving control circuit may include a look up table storing information about one or more characteristics of each display module.

Claims

1. An image display apparatus comprising:

a plurality of display modules consisting of display elements manufactured from different bins;

a plurality of driving circuits providing different driving conditions for said display modules, at least one driving circuit for each display module; and

a control circuit controlling said driving circuits to compensate each display module for variation of characteristics amongst display modules manufactured from different bins.

2. An image display apparatus of claim 1, wherein said control circuit comprises a look up table storing information about one or more characteristics of each display module.

3. An image display apparatus of claim 1, further comprising a circuit for dynamically controlling said display modules dependent on the operating conditions of said display modules.

4. An image display apparatus of claim 3, wherein said operating conditions are selected from the group of conditions consisting of wavelength of emitted light, intensity of emitted light, working temperature, and operation time.

5. An image display apparatus of claim 1, wherein each display element is a light emitting diode.

6. An image display apparatus of claim 1, wherein one or more characteristics of said display elements is selected from the group of characteristics consisting of wavelength of emitted light, intensity of emitted light, and biasing current-voltage relationship.

7. An image display apparatus of claim 1, wherein a driving condition provided by each driving circuit is selected from the group of driving conditions consisting of biasing current and biasing voltage.

8. An image display apparatus of claim 1 is either a display apparatus for LCD backlight or LED display panel.

9. An image display apparatus of claim 8 wherein said apparatus provides uniform, white-balance back lighting or a special pattern composed of different colors.

10. A process for manufacturing an image display apparatus comprising steps of:

characterizing and inspecting manufactured display elements from different bins;

assembling display modules, each having display elements from a single bin, to form a large display array, at least two modules comprising display elements from different bins;

determining the driving conditions for each bin based on the characteristics obtained from characterizing and inspecting said display elements to achieve a desired performance; and

providing compensated driving circuit for each display module with said respective determined driving condition determined to produce light of substantially uniform wavelength or intensity from said large display array.

11. The process according to claim 10, further comprising step of manufacturing a plurality of bins of display elements.

12. The process according to claim 10, further comprising step of creating display modules using display elements selected from a single bin for each display module.

13. The process according to claim 10, wherein each display element is a light emitting diode.

14. The process according to claim 10, wherein one or more characteristics of said display element is selected from the group of characteristics consisting of wavelength of emitted light, intensity of emitted light, and biasing current-voltage relationship.

15. The process according to claim 10, wherein a driving condition provided by each driving circuit is selected from the group of driving conditions consisting of biasing current and biasing voltage.

16. A method of displaying an image, said method comprising the steps of:

providing a plurality of display modules comprising display elements manufactured from different bins;

providing different driving conditions for said display modules, at least one driving condition being provided for each display module; and

controlling said driving conditions to compensate each display module for variation of characteristics amongst modules of bins.

17. The method according to claim 16, wherein controlling step comprises storing information about one or more characteristics of each display module in a look up table.

18. The method according to claim 16, wherein said display modules are controlled dynamically dependent on the operating conditions of said display modules.

19. The method according to claim 18, wherein said operating conditions are selected from the group of conditions consisting of wavelength of emitted light, intensity of emitted light, working temperature, and operation time.

20. The method according to claim 16, wherein each display element is a light emitting diode.

21. The method according to claim 16, wherein one or more characteristics of said display element is selected from the group of characteristics consisting of wavelength of emitted light, intensity of emitted light, and biasing current-voltage relationship.

22. The method according to claim 16, wherein a provided driving condition is selected from the group of driving conditions consisting of biasing current and biasing voltage.

23. The method according to claim 16, wherein said method provides LCD backlighting or displays an image in a LED display panel.

24. The method according to claim 23, wherein said method provides uniform, white-balance back lighting or a special pattern composed of different colors.