VIDEO PROCESSING CIRCUIT, VIDEO PROCESSING METHOD, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC APPARATUS

• US 20110205208A1
• Filed: 02/07/2011
• Published: 08/25/2011
• Est. Priority Date: 02/25/2010
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: IISAKA, Hidehito, HOSAKA, Hiroyuki
• Granted Patent: US 8,466,866 B2
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A video processing circuit used in a liquid crystal panel, includes: a first boundary detector that analyzes a video signal of a present frame to detect a boundary between a first pixel and a second pixel; a second boundary detector that analyzes a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel; a correction portion that corrects an applied voltage to a liquid crystal device corresponding to a second pixel which is adjacent to a portion of the boundary detected by the first boundary detector, which is changed from the boundary detected by the second boundary detector from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.

Claims

1. A video processing circuit used in a liquid crystal panel in which a liquid crystal is interposed between a first substrate on which a pixel electrode is provided so as to correspond to each of a plurality of pixels and a second substrate on which a common electrode is provided, and a liquid crystal device is formed of the pixel electrode, the liquid crystal, and the common electrode,

the video processing circuit inputting video signals that specify an applied voltage to the liquid crystal device for each of the pixels and defining each of the applied voltages to the liquid crystal devices based on processed video signals, comprising:

a first boundary detector that analyzes a video signal of a present frame to detect a boundary between a first pixel of which the applied voltage specified by the video signal is lower than a first voltage and a second pixel of which the applied voltage is equal to or higher than a second voltage higher than the first voltage;

a second boundary detector that analyzes a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel;

a correction portion that corrects an applied voltage to a liquid crystal device corresponding to a second pixel which is adjacent to a portion of the boundary detected by the first boundary detector, which is changed from the boundary detected by the second boundary detector from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.

2. The video processing circuit according to claim 1,

wherein the correction portion corrects the applied voltages to liquid crystal devices corresponding to the second pixel adjacent to the changed portion and a second pixel continuous to the second pixel to the voltage equal to or higher than the first voltage and lower than the second voltage.

3. The video processing circuit according to claim 2,

wherein the correction portion corrects the applied voltages to liquid crystal devices corresponding to the first pixel adjacent to the changed portion and a first pixel continuous to the first pixel from the applied voltage specified by the video signal of the present frame to the voltage equal to or higher than the first voltage and lower than the second voltage and lower than the applied voltages to liquid crystal devices corresponding to the second pixels adjacent to the changed portion disposed therebetween a second pixel continuous to the second pixels.

5. The video processing circuit according to claim 3,

wherein the correction portion corrects the applied voltage to a liquid crystal device corresponding to the first pixel continuous to the first pixel adjacent to the changed portion from the applied voltage specified by the video signal of the present frame to a voltage higher than the applied voltage to a liquid crystal device corresponding to a first pixel in which the applied voltage is not corrected and lower than the applied voltage to the first pixel adjacent to the changed portion.

6. The video processing circuit according to claim 2,

wherein the correction portion corrects the applied voltage to a liquid crystal device corresponding to the second pixel continuous to the second pixel adjacent to the changed portion from the applied voltage specified by the video signal of the present frame to a voltage higher than the applied voltage to a liquid crystal device corresponding to a second pixel in which the applied voltage is not corrected and lower than the applied voltage to the second pixel adjacent to the changed portion.

9. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 1.

10. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 2.

11. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 3.

13. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 5.

14. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 6.

15. An electronic apparatus having the liquid crystal display device according to claim 9.

16. An electronic apparatus having the liquid crystal display device according to claim 10.

17. An electronic apparatus having the liquid crystal display device according to claim 11.

19. An electronic apparatus having the liquid crystal display device according to claim 13.

20. An electronic apparatus having the liquid crystal display device according to claim 14.

4. A video processing circuit used in a liquid crystal panel in which a liquid crystal is interposed between a first substrate on which a pixel electrode is provided so as to correspond to each of a plurality of pixels and a second substrate on which a common electrode is provided, and a liquid crystal device is formed of the pixel electrode, the liquid crystal, and the common electrode,

the video processing circuit inputting video signals that specify an applied voltage to the liquid crystal device for each of the pixels and defining each of the applied voltages to the liquid crystal devices based on processed video signals, comprising:

a first boundary detector that analyzes a video signal of a present frame to detect a boundary between a first pixel of which the applied voltage specified by the video signal is lower than a first voltage and a second pixel of which the applied voltage is equal to or higher than a second voltage higher than the first voltage;

a second boundary detector that analyzes a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel;

a correction portion that corrects an applied voltage to liquid crystal devices corresponding to a first pixel which is adjacent to a portion of the boundary detected by the first boundary detector, which is changed from the boundary detected by the second boundary detector and a first pixel continuous to the first pixel from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.

12. A liquid crystal display device comprising:

a liquid crystal panel having a liquid crystal device in which a liquid crystal is interposed between a pixel electrode provided on a first substrate so as to correspond to each of a plurality of pixels and a common electrode provided on a second substrate; and

the video processing circuit according to claim 4.

18. An electronic apparatus having the liquid crystal display device according to claim 12.

7. A video processing method used in a liquid crystal panel in which a liquid crystal is interposed between a first substrate on which a pixel electrode is provided so as to correspond to each of a plurality of pixels and a second substrate on which a common electrode is provided, and a liquid crystal device is formed of the pixel electrode, the liquid crystal, and the common electrode, the video processing method inputting video signals that specify an applied voltage to the liquid crystal device for each of the pixels and defining each of the applied voltages to the liquid crystal devices based on processed video signals, comprising:

analyzing a video signal of a present frame to detect a boundary between a first pixel of which the applied voltage specified by the video signal is lower than a first voltage and a second pixel of which the applied voltage is equal to or higher than a second voltage higher than the first voltage;

analyzing a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel;

correcting an applied voltage to a liquid crystal device corresponding to a second pixel which is adjacent to a portion of the boundary detected in the present frame, which is changed from the boundary detected in the frame one frame before the present frame from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.

8. A video processing method of inputting video signals that specify an applied voltage to a liquid crystal device for each pixels and defining each of the applied voltages to the liquid crystal devices based on processed video signals, comprising:

analyzing a video signal of a present frame to detect a boundary between a first pixel of which the applied voltage specified by the video signal is lower than a first voltage and a second pixel of which the applied voltage is equal to or higher than a second voltage higher than the first voltage;

analyzing a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel;

correcting an applied voltage to liquid crystal devices corresponding to a first pixel which is adjacent to a portion of the boundary detected in the present frame, which is changed from the boundary detected in the frame one frame before the present frame and a first pixel continuous to the first pixel from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.