Liquid crystal pixel correction using pixel boundary detection

摘要

A video processing circuit detects a risk boundary that is a part of a boundary between a dark pixel and a bright pixel, and is determined in accordance with the tilt azimuth of liquid crystal molecules from a boundary changed over the previous frame to the current frame and, for at least one side of dark pixels and bright pixels brought into contact with the detected risk boundary, corrects a video signal designating the application voltage of a liquid crystal element corresponding to the pixel of the frame brought into contact with the risk boundary out of a plurality of frames from the current frame to k frames (here, k is a natural number) following the current frame such that a lateral direction electric field generated between the dark pixel and the bright pixel decreases.

主权项

1. A method of processing a video in which an input video signal designating an application voltage of a liquid crystal element for each pixel is corrected, and the application voltage of the liquid crystal element is defined based on the corrected video signal, the method comprising:
detecting a boundary that changes over a frame that is one frame before a current frame to the current frame out of boundaries between a first pixel in which the application voltage is lower than a first voltage in the input video signal and a second pixel in which the application voltage is equal to or higher than a second voltage that is higher than the first voltage; detecting a risk boundary that is a part of the boundaries between the first pixel and the second pixel designated by the input video signal and is determined based on a tilt azimuth of the liquid crystal for each of a plurality of frames including the current frame to k frames (here, k is a natural number) following the current frame; and correcting the video signal designating the application voltage of the liquid crystal element corresponding to the pixel of a frame that is brought into contact with the risk boundary detected in the detecting of the risk boundary out of a plurality of frames such that a lateral direction electric field generated by the first pixel and the second pixel decreases for at least one of the first pixel and the second pixel that are brought into contact with the risk boundary detected in accordance with the video signal of the current frame in the detecting of a risk boundary out of the boundaries detected in the detecting of the boundary, wherein, in the correcting of the video signal, in a case where the application voltage of the liquid crystal element corresponding to the first pixel brought into contact with the risk boundary detected in accordance with the video signal of the frame that is brought into contact with the risk boundary is lower than a third voltage which is lower than the first voltage, the application voltage is corrected to be equal to or higher than the third voltage.