GENERATING CORRECTED GRAY SCALE DATA TO IMPROVE DISPLAY QUALITY

• US 20100238204A1
• Filed: 04/26/2010
• Published: 09/23/2010
• Est. Priority Date: 04/10/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: CHEN, YU-YEH, LIN, HUNG-YU, LEE, CHIA-HANG
• Granted Patent: US 7,839,380 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• 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 circuit to drive signals in a display device, comprising:

an image signal generator to generate a first frame signal and a second frame signal in successive time periods;

a frame buffer register for storing the first frame signal;

a first look-up table, electrically coupled to the frame buffer register, to generate a first over-drive voltage and a second over-drive voltage according to the first frame signal and the second frame signal, respectively;

a comparator, electrically coupled to the first look-up table, to compare the first over-drive voltage with the second over-drive voltage to determine whether the first over-drive voltage and the second over-drive voltage are substantially the same; and

a look-up data structure, electrically coupled to the comparator, to respectively determine a corrected first over-drive voltage corresponding to the first over-drive voltage and a corrected second over-drive voltage corresponding to the second over-drive voltage according to a result of the comparison by the comparator.

2. The circuit according to claim 1, wherein the look-up data structure comprises a second look-up table and a third look-up table, wherein the second look-up table is to produce the corrected first over-drive voltage, and wherein the third look-up table is to produce the corrected second over-drive voltage.

3. The circuit according to claim 1, wherein the comparator is to determine whether the first and second over-drive voltages are substantially the same by determining whether the first and second over-drive voltages are within a predefined threshold.

4. The circuit according to claim 3, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is performed in response to the comparison result indicating that the first and second over-drive voltages are within the predefined threshold.

5. The circuit according to claim 4, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is bypassed in response to the comparison result indicating that the first and second over-drive voltages are not within the predefined threshold.

6. A display apparatus comprising:

a liquid crystal display panel;

a backlight module; and

a timing controller comprising a circuit to drive signals in a display device, the circuit comprising;

an image signal generator to generate a first frame signal and a second frame signal in successive time periods;

a frame buffer register for storing the first frame signal;

a first look-up table, electrically coupled to the frame buffer register, to generate a first over-drive voltage and a second over-drive voltage according to the first frame signal and the second frame signal, respectively;

a comparator, electrically coupled to the first look-up table, to compare the first over-drive voltage with the second over-drive voltage to determine whether the first over-drive voltage and the second over-drive voltage are substantially the same; and

a look-up data structure, electrically coupled to the comparator, to respectively determine a corrected first over-drive voltage corresponding to the first over-drive voltage and a corrected second over-drive voltage corresponding to the second over-drive voltage according to a result of the comparison by the comparator.

7. The display apparatus according to claim 6, wherein the look-up data structure comprises a second look-up table and a third look-up table, wherein the second look-up table is to produce the corrected first over-drive voltage, and wherein the third look-up table is to produce the corrected second over-drive voltage.

8. The display apparatus according to claim 6, wherein the comparator is to determine whether the first and second over-drive voltages are substantially the same by determining whether the first and second over-drive voltages are within a predefined threshold.

9. The display apparatus according to claim 8, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is performed in response to the comparison result indicating that the first and second over-drive voltages are within the predefined threshold.

10. The display apparatus according to claim 9, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is bypassed in response to the comparison result indicating that the first and second over-drive voltages are not within the predefined threshold.

11. A method of driving signals in a display device, comprising:

generating, by an image signal generator, a first frame signal and a second frame signal in successive time periods;

storing, by a frame buffer register, the first frame signal;

generating, by a first look-up table, a first over-drive voltage and a second over-drive voltage according to the first frame signal and the second frame signal, respectively;

comparing, by a comparator, the first over-drive voltage with the second over-drive voltage to determine whether the first over-drive voltage and the second over-drive voltage are substantially the same; and

determining, by a look-up data structure, a corrected first over-drive voltage corresponding to the first over-drive voltage and a corrected second over-drive voltage corresponding to the second over-drive voltage according to a result of the comparison by the comparator.

12. The method according to claim 11, wherein the look-up data structure comprises a second look-up table and a third look-up table, wherein the second look-up table produces the corrected first over-drive voltage, and wherein the third look-up table produces the corrected second over-drive voltage.

13. The method according to claim 11, wherein the comparator determines whether the first and second over-drive voltages are substantially the same by determining whether the first and second over-drive voltages are within a predefined threshold.

14. The method according to claim 13, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is performed in response to the comparison result indicating that the first and second over-drive voltages are within the predefined threshold.

15. The method according to claim 14, wherein production of the corrected first over-drive voltage and the corrected second over-drive voltage is bypassed in response to the comparison result indicating that the first and second over-drive voltages are not within the predefined threshold.