Image display apparatus and image display method

Abstract

When displaying moving images by using liquid crystal panels and others, a problem exists in that tail streaks occur, and image degradation is resultantly caused. To solve this problem, an echo suppression circuit divides a video signal into a pair composed of two successive frames for comparison between these two frames in signal level for the purpose of suppressing an echo phenomenon occurring when a liquid crystal panel displays video signals including moving images. If these two frames are not the same in signal level, the signal is accordingly corrected so as to equalize the signal level of these frames. Based on the video signals and others corrected by the echo suppression circuit, a controller operates the liquid crystal panel with AC drive through a source driver and a gate driver. As such, the drive voltage used to operate the liquid crystal panel with AC drive is adjusted so as to be balanced between positive and negative. In this manner, the tail streaks are prevented when displaying moving images.

1 - 24 . (canceled) 
     
     
         25 . A liquid crystal display apparatus for displaying an image based on an input video signal, said liquid crystal display apparatus comprising:
 a display device for outputting image lights according to a voltage to be applied; and   a drive unit for driving said display device by switching a drive voltage applied across a pixel liquid crystal between positive and negative for application based on the input video signal, wherein   said drive unit is operable to drive said display device by dividing one vertical scanning period of the input video signal into a first sub period and a second sub period, and   said drive unit is operable to output the input video signal in the first sub period, and output a compensation signal in the second sub period.   
     
     
         26 . The liquid crystal display apparatus according to  claim 25 , wherein the second sub period is shorter than the first sub period. 
     
     
         27 . The liquid crystal display apparatus according to  claim 25 , wherein the drive voltage in the second sub period is a voltage of a pedestal level or lower when said display device is a normally black type, and is a voltage of the pedestal level or higher when said display device is a normally white type. 
     
     
         28 . The liquid crystal display apparatus according to  claim 25 , wherein said display device is a normally black type, and the drive voltage in said second sub period is OV. 
     
     
         29 . The liquid crystal display apparatus according to  claim 25 , wherein the drive voltage in the second sub period is applied to a plurality of scanning lines at one time. 
     
     
         30 . An image display method for displaying an image by driving a display device based on an input video signal, said method comprising:
 driving the display device by switching a drive voltage applied across a pixel liquid crystal between positive and negative for application based on the input video signal, and by dividing one vertical scanning period of the input video signal into a first sub period and a second sub period, wherein   said driving includes outputting the input video signal in the first sub period, and outputting a compensation signal in the second sub period.