Video processing circuit, video processing method, electro-optical device, and electronic apparatus

1. A video processing circuit comprising:

a boundary detection unit that detects a boundary between a first pixel to which an application voltage which is a first voltage is applied, and a second pixel to which an application voltage which is a second voltage higher than the first voltage is applied, based on a video signal which designates the application voltage for each pixel of a liquid crystal panel having a plurality of pixels for each unit frame, and indicates a video which alternately switches between a first video and a second video which is obtained by moving in parallel with the first video for each unit frame;

a first determination unit that determines whether or not a boundary detected by the boundary detection unit in a kth (k is a natural number) unit frame exists in a (k−2)th unit frame;

a second determination unit that determines whether or not the boundary detected in the kth unit frame is a boundary which is moved from a (k−1)th unit frame to the kth unit frame;

a correction unit that sets as a correction target pixel a pixel which is in contact with a boundary that is determined not to exist in the (k−2)th unit frame by the first determination unit and that is determined to have moved from the (k−1)th unit frame to the kth unit frame by the second determination unit, among the boundaries detected in the kth unit frame, and corrects the application voltage in such a manner that a fringe electric field occurring at the boundary is decreased; and

an output unit that outputs a signal according to a video signal in which the application voltage is corrected by the correction unit, in such a manner that the liquid crystal panel is driven based on the signal.

2. The video processing circuit according to claim 1 , wherein the second determination unit determines that, when the boundary detected in the kth unit frame is in contact with a pixel which is changed from the first pixel to the second pixel, from the (k−1)th unit frame to the kth unit frame, the boundary is moved.

3. The video processing circuit according to claim 2 , wherein the second determination unit determines that, when the boundary is in contact with the changed pixel, and the boundary is detected at opposite side to the kth unit frame with the changed pixel interposed therebetween, in the (k−1)th unit frame, the boundary is moved.

4. The video processing circuit according to claim 1 , wherein the correction unit determines that a pixel which is in contact with the boundary that is not the moved boundary, among the boundaries detected in the kth unit frame, is set as the correction target pixel, when the boundary is detected at opposite side to the frame with the pixel interposed therebetween, in the (k−2)th unit frame.

5. A video processing method comprising:

detecting a boundary between a first pixel to which an application voltage which is a first voltage is applied, and a second pixel to which an application voltage which is a second voltage higher than the first voltage is applied, based on a video signal which designates the application voltage for each pixel of a liquid crystal panel having a plurality of pixels and indicates a video which alternately switches between a first video and a second video which is obtained by moving in parallel with the first video for each unit frame;

determining whether or not a boundary detected by a boundary detection unit in a kth (k is a natural number) unit frame exists in a (k−2)th unit frame;

determining whether or not the boundary detected in the kth unit frame is a boundary which is moved from a (k−1)th unit frame to the kth unit frame;

setting as a correction target pixel a pixel which is in contact with a boundary that is determined not to exist in the (k−2)th unit frame by a first determination unit and is determined to have moved from the (k−1)th unit frame to the kth unit frame by a second determination unit, among the boundaries detected in the unit frame k, and correcting the application voltage in such a manner that a fringe electric field occurring at the boundary is decreased; and

outputting a signal according to a video signal in which the application voltage is corrected, in such a manner that the liquid crystal panel is driven based on the signal.

6. An electro-optical device comprising:

a liquid crystal panel having a plurality of pixels;

a boundary detection unit that detects a boundary between a first pixel to which an application voltage which is a first voltage is applied, and a second pixel to which an application voltage which is a second voltage higher than the first voltage is applied, based on a video signal which designates the application voltage for each pixel of a liquid crystal panel, and indicates a video which alternately switches between a first video and a second video which is obtained by moving in parallel with the first video for each unit frame;

a first determination unit that determines whether or not a boundary detected by the boundary detection unit in a kth (k is a natural number) unit frame exists in a (k−2)th unit frame;

a second determination unit that determines whether or not the boundary detected in the kth unit frame is a boundary which is moved from a (k−1)th unit frame to the kth unit frame;

a correction unit that sets as a correction target pixel a pixel which is in contact with a boundary that is determined not to exist in the (k−2)th unit frame by the first determination unit and that is determined to have moved from the (k−1)th unit frame to the kth unit frame by the second determination unit, among the boundaries detected in the kth unit frame, and corrects the application voltage in such a manner that a fringe electric field occurring at the boundary is decreased; and

a drive circuit that drives the liquid crystal panel, based on a video signal in which the application voltage is corrected by the correction unit.

7. The electro-optical device according to claim 6 , further comprising:

an optical path shift unit that shifts an optical path of light which is modulated by the liquid crystal panel; and

a shift control circuit that controls the optical path shift unit, according to a video signal which is used for driving the liquid crystal panel and displays any one of the first video and the second video.

8. An electronic apparatus comprising the electro-optical device according to claim 6 .

9. The video processing circuit according to claim 2 , wherein the correction unit determines that a pixel which is in contact with the boundary that is not the moved boundary, among the boundaries detected in the kth unit frame, is set as the correction target pixel, when the boundary is detected at opposite side to the frame with the pixel interposed therebetween, in the (k−2)th unit frame.

10. The video processing circuit according to claim 3 , wherein the correction unit determines that a pixel which is in contact with the boundary that is not the moved boundary, among the boundaries detected in the kth unit frame, is set as the correction target pixel, when the boundary is detected at opposite side to the frame with the pixel interposed therebetween, in the (k−2)th unit frame.

11. An electronic apparatus comprising the electro-optical device according to claim 7 .