Generating corrected gray-scale data to improve display quality

• US 7,705,816 B2
• Filed: 04/10/2007
• Issued: 04/27/2010
• Est. Priority Date: 04/10/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Optoelectronics (InnoLux Corporation)
• Inventors: Lin, Hung-Yu, Chen, Yu-Yeh, Lee, Chia-Hang
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): STEINBERG, JEFFREY S
• Application Number:
  US11/784,943
• Publication Number:
  US 20070236439A1
• Time in Patent Office: 1,113 Days
• Field of Search: 345/89, 345690-693
• US Class Current: 345/89
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 3/2007 Display of intermediate tones
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A method of displaying image data, which can mitigate a double-boundary problem and improve MPRT, includes the steps of: receiving a plurality of frame data of a pixel; correcting subframe data of two of the plurality frame data; and sequentially displaying each of the subframe data of the plurality frame data.

Claims

1. A method of improving image display quality, comprising:

receiving first frame data, second frame data and third frame data of a pixel, wherein each of the first frame data, the second frame data and the third frame data comprises high gray-scale subframe data and low gray-scale subframe data;

generating corrected low gray-scale subframe data of the first frame data and corrected high gray-scale subframe data of the second frame data according to the first frame data, the second frame data and the third frame data; and

sequentially displaying the high gray-scale subframe data of the first frame data, the corrected low gray-scale subframe data of the first frame data, the corrected high gray-scale subframe data of the second frame data, the low gray-scale subframe data of the second frame data, the high gray-scale subframe data of the third frame data and the low gray-scale subframe data of the third frame data.

2. The method according to claim 1, wherein a control voltage value corresponding to the corrected low gray-scale subframe data of the first frame data is greater than a control voltage value corresponding to the low gray-scale subframe data of the first frame data.

3. The method according to claim 1, wherein a control voltage value corresponding to the corrected high gray-scale subframe data of the second frame data is less than a control voltage value corresponding to the high gray-scale subframe data of the second frame data.

4. The method according to claim 3, wherein the control voltage value corresponding to the high gray-scale subframe data of the second frame data is a first over-drive voltage value, and the control voltage corresponding to the corrected high gray-scale is a second over-drive voltage value less than the first over-drive voltage value.

5. The method according to claim 1, wherein the high gray-scale subframe data and the low gray-scale subframe data of the first frame data have the same polarity, and the high gray-scale subframe data and the low gray-scale subframe data of the second frame data have the same polarity.

6. The method according to claim 1, wherein the first frame data and the second frame data have opposite polarities.

7. The method according to claim 1, further comprising:

generating the corrected low gray-scale subframe data of the first frame data according to at least one of the low gray-scale subframe data of the second frame data and the low gray-scale subframe data of the third frame data.

8. The method according to claim 1, further comprising:

generating the corrected high gray-scale subframe data of the second frame data according to the high gray-scale subframe data of the third frame data.

9. The method according to claim 1, wherein each of the frames includes a first subframe and a second subframe, wherein generating the corrected low gray-scale subframe data comprises adjusting a control voltage to provide a displayed luminance of a first subframe of the second frame equal to 50% to 100% of a displayed luminance of the first subframe of the third frame, and wherein generating the corrected high gray-scale subframe data comprises adjusting a control voltage to provide a displayed luminance of the second subframe of the second frame equal to 90% to 110% of a displayed luminance of the second subframe of the third frame.

10. A method of improving image display quality, comprising:

receiving first frame data, second frame data and third frame data of a pixel, wherein each of the first frame data, the second frame data and the third frame data comprises low gray-scale subframe data and high gray-scale subframe data;

generating corrected low gray-scale subframe data of the second frame data and corrected high gray-scale subframe data of the second frame data according to the second frame data and the third frame data; and

sequentially displaying the low gray-scale subframe data of the first frame data, the high gray-scale subframe data of the first frame data, the corrected low gray-scale subframe data of the second frame data, the corrected high gray-scale subframe data of the second frame data, the low gray-scale subframe data of the third frame data, and the high gray-scale subframe data of the third frame data.

11. The method according to claim 10, wherein a control voltage value corresponding to the corrected low gray-scale subframe data of the second frame data is greater than a control voltage value corresponding to the low gray-scale subframe data of the second frame data.

12. The method according to claim 10, wherein a control voltage value corresponding to the corrected high gray-scale subframe data of the second frame data is less than a control voltage value corresponding to the high gray-scale subframe data of the second frame data.

13. The method of claim 12, wherein the control voltage value corresponding to the high gray-scale subframe data of the second frame data is a first over-drive voltage values, and the control voltage corresponding to the corrected high gray-scale is a second over-drive voltage value less than the first over-drive voltage value.

14. The method according to claim 10, wherein the high gray-scale subframe data and the low gray-scale subframe data of the first frame data have the same polarity, and the high gray-scale subframe data and the low gray-scale subframe data of the second frame data have the same polarity.

15. The method according to claim 10, wherein the first frame data and the second frame data have opposite polarities.

16. The method according to claim 10, further comprising:

generating the corrected low gray-scale subframe data of the second frame data according to at least one of the low gray-scale subframe data of the first frame data and the low gray-scale subframe data of the third frame data.

17. The method according to claim 10, further comprising:

generating the corrected high gray-scale subframe data of the second frame data according to the high gray-scale subframe data of the third frame data.

18. The method according to claim 10, wherein each of the frames includes a first subframe and a second subframe, wherein generating the corrected low gray-scale subframe data comprises adjusting a control voltage to provide a displayed luminance of a second subframe of the second frame equal to 50% to 100% of a displayed luminance of the first subframe of the third frame, and wherein generating the corrected high gray-scale subframe data comprises adjusting a control voltage to provide a displayed luminance of the first subframe of the third frame equal to 90% to 110% of a displayed luminance of a first subframe of a frame after the third frame.

19. A display apparatus comprising:

a liquid crystal display panel;

a backlight module; and

a timing controller to;

receive first frame data, second frame data, and third frame data of a pixel, wherein each of the first frame data and the second frame data comprises high gray-scale subframe data and low gray-scale subframe data;

generate corrected low gray-scale subframe data of the first frame data and corrected high gray-scale subframe data of the second frame data according to the first frame data, the second frame data, and the third frame data; and

sequentially output the high gray-scale subframe data of the first frame data, the corrected low gray-scale subframe data of the first frame data, the corrected high gray-scale subframe data of the second frame data, and the low gray-scale subframe data of the second frame data.

20. The apparatus according to claim 19, wherein

the first frame data and the second frame data are for determining whether the low gray-scale subframe data of the first frame data and the high gray-scale subframe data of the second frame data have to be corrected;

and

the third frame data is for determining the corrected low gray-scale subframe data of the first frame data and the corrected high gray-scale subframe data of the second frame data.

21. A display apparatus comprising:

a liquid crystal display panel;

a backlight module; and

a timing controller to;

receive first frame data, second frame data and third frame data of a pixel, wherein each of the first frame data, the second frame data and the third frame data comprises high gray-scale subframe data and low gray-scale subframe data;

generate corrected low gray-scale subframe data of the second frame data and corrected high gray-scale subframe data of the second frame data according to the first frame data, the second frame data, and the third frame data; and

sequentially output the low gray-scale subframe data of the first frame data, the high gray-scale subframe data of the first frame data, the corrected low gray-scale subframe data of the second frame data, the corrected high gray-scale subframe data of the second frame data, the low gray-scale subframe data of the third frame data, and the high gray-scale subframe data of the third frame data.

22. The apparatus according to claim 21, wherein

the first frame data and the second frame data are for determining whether the low gray-scale subframe data of the second frame data and the high gray-scale subframe data of the second frame data have to be corrected;

and

the third frame data is for determining the corrected low gray-scale subframe data of the second frame data and the corrected high gray-scale subframe data of the second frame data.