Image display apparatus and image display method
First Claim
1. 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 display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, and said drive unit is operable to drive said liquid crystal display device by dividing one vertical scanning period of the input video signal into a first sub period and a second sub period.
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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.
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Citations
24 Claims
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1. A liquid crystal display apparatus for displaying an image based on an input video signal, said liquid crystal display apparatus comprising:
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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 display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, and said drive unit is operable to drive said liquid crystal display device by dividing one vertical scanning period of the input video signal into a first sub period and a second sub period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An image display method for displaying an image by driving a display device based on an input video signal, wherein said display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, said method comprising:
driving the liquid crystal 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. - View Dependent Claims (20, 21)
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22. An image display method for displaying an image by driving a display device based on an input video signal, wherein said display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, said method comprising:
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a drive step of driving said liquid crystal display device by switching a drive voltage applied across a pixel liquid crystal between positive and negative for application based on said input video signal, wherein said drive step scans, in an n-th frame, odd-numbered scanning lines for a data signal, and even-numbered scanning lines for a compensation signal, and scans, in an n+1-th frame, the odd-numbered scanning lines for the compensation signal, and the even-numbered lines for the data signal.
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23. An image display method for displaying an image by driving a display device based on an input video signal, wherein said display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, said method comprising:
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a drive step of driving said liquid crystal display device by switching a drive voltage applied across a pixel liquid crystal between positive and negative for application based on said input video signal, wherein during one vertical scanning period of said input video signal, after sequentially scanning either ones of odd-numbered scanning lines and even-numbered scanning lines, said drive step sequentially scans scanning lines other than said either ones of odd-numbered scanning lines and even-numbered scanning lines.
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24. An image display method for displaying an image by driving a display device based on an input video signal, wherein said display device is a liquid crystal display device including liquid crystal, a pixel electrode and a common electrode for applying the voltage to said liquid crystal, and said liquid crystal is driven by an electric field which is generated between said pixel electrode and said common electrode, and is almost parallel to a substrate, said method comprising:
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a drive step of driving said liquid crystal display device by switching a drive voltage applied across a pixel liquid crystal between positive and negative for application based on said input video signal, wherein said drive step applies the drive voltage of the same polarity without polarity reverse to at least any two successive frames.
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Specification