Brightness correction method and system utilizing the same

• US 7,746,364 B2
• Filed: 12/20/2005
• Issued: 06/29/2010
• Est. Priority Date: 06/17/2005
• Status: Expired due to Fees

• Current Assignee: Getac Technology Corporation
• Original Assignee: Getac Technology Corporation
• Inventors: Yang, Chih-Fu, Shen, Chang-Han
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Sheng; Tom V
• Application Number:
  US11/313,887
• Publication Number:
  US 20060284898A1
• Time in Patent Office: 1,652 Days
• Field of Search: 345/63, 345/77, 345/88, 345/89, 345/98, 345/690, 345/207, 348/674, 348/675, 348/E5.074, 348/E9.054
• US Class Current: 345/690
• 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 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309

Abstract

A brightness correction method for a display panel, comprising showing a plurality of image areas in the display panel, wherein the image areas display different colors, each color has a plurality of luminance values according to a plurality of gray values, and wherein each gray value corresponds to a gamma voltage; detecting the luminance values; and adjusting the gamma voltages according to the detected luminance values.

Claims

1. A brightness correction method for a display panel, comprising:

providing a plurality of gray values in a sequence, wherein each gray value corresponds to a gamma voltage;

for each gray value provided, showing in turn a plurality of image areas in the display panel, wherein the plurality of image areas are defined according to an input signal group, wherein the display panel receives the input signal group, and wherein the image areas display different colors, and each color has a luminance value according to the provided gray value;

detecting in turn the luminance values of the colors showing in the image areas for each gray value provided; and

adjusting the gamma voltages according to the detected luminance values.

2. The brightness correction method as claimed in claim 1, wherein the positions of the image areas and colors displayed in the image areas are defined by the input signal group.

3. The brightness correction method as claimed in claim 2, wherein the external device is coupled to the display panel through a digital visual interface (DVT).

4. The brightness correction method as claimed in claim 1, wherein the input signal group is provided by an external device.

5. The brightness correction method as claimed in claim 1, wherein the input signal group is provided by a control device of the display panel.

6. The brightness correction method as claimed in claim 1, wherein the luminance values are detected by a test apparatus comprising a plurality of test terminals, and wherein each test terminal directly contacts each image area.

7. The brightness correction method as claimed in claim 1, wherein the luminance values are detected by a test apparatus comprising a plurality of test terminals, and wherein each image area indirectly contacts each test terminal.

8. The brightness correction method as claimed in claim 1, wherein the adjusted gamma voltages are stored in a correction table.

9. The brightness correction method as claimed in claim 8, wherein the correction table is recorded in a storage device.

10. The brightness correction method as claimed in claim 9, wherein the storage device is located in the display panel.

11. The brightness correction method as claimed in claim 9, wherein the storage device is an EEPROM.

12. The brightness correction method as claimed in claim 1, wherein the colors shown in the image areas are red, green, and blue, respectively.

13. A software, embodied in a computer readable storage medium, for executing the brightness correction method as claimed in claim 1.

14. A brightness correction system comprising:

a display panel for showing a plurality of image areas, wherein the image areas have different colors, each color has a plurality of luminance values according to a plurality of gray values provided in a sequence, wherein each gray value corresponds to a gamma voltage;

a brightness detector detecting in turn the luminance values of the colors showing in the image areas for each gray value provided; and

a processor adjusting the gamma voltages according to the detected luminance values, wherein the processor provides an input signal group to the display panel for defining the image areas.

15. The brightness correction system as claimed in claim 14, wherein the input signal group defines positions of the image areas and colors displayed in the image areas.

16. The brightness correction system as claimed in claim 14, wherein the processor is coupled to the display panel through a DVI interface.

17. The brightness correction system as claimed in claim 14, wherein the display panel comprises a control device for providing the input signal group.

18. The brightness correction system as claimed in claim 14, wherein the brightness detector comprises a plurality of test terminals for detecting the luminance values and wherein each test terminal directly contacts each image area.

19. The brightness correction system as claimed in claim 14, wherein the brightness detector comprises a plurality of test terminals for detecting the luminance values and each test terminal indirectly contacts each image area.

20. The brightness correction system as claimed in claim 14, wherein the display panel further comprises a storage device for storing the adjusted gamma voltages.

21. The brightness correction system as claimed in claim 20, wherein the storage device is an EEPROM.

22. The brightness correction system as claimed in claim 14, wherein the colors shown in the image areas are red, green, and blue, respectively.