Multi-primary color liquid crystal panel drive circuit, multi-primary color liquid crystal panel drive method, liquid crystal display device and overdrive setting method
First Claim
1. A multi-primary-color liquid crystal panel driver comprising:
- a multi-primary-color converter which performs a multi-primary-color conversion to convert the grayscale levels of an input video signal in each of a plurality of vertical scanning periods into grayscale levels of four or more primary colors;
an overdrive circuit which receives four or more color signals corresponding to the four or more primary colors and which sets, based on the grayscale levels that have been subjected to the multi-primary-color conversion in one vertical scanning period and on the grayscale levels that have been subjected to the multi-primary-color conversion in another vertical scanning period that is earlier than the one vertical scanning period by at least one period, the grayscale levels of the four or more primary colors in that one vertical scanning period;
an input terminal, through which the input video signal, which contains three or more color signals corresponding to only some of the four or more primary colors, is input; and
four or more bypass paths which respectively correspond to the four or more primary colors and which connect the input terminal to the overdrive circuit without passing through the multi-primary-color converter;
whereintwo of the four or more bypass paths are electrically connected together.
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Abstract
A multi-primary-color liquid crystal panel driver (100) according to the present invention includes: a multi-primary-color converter (110) which performs a multi-primary-color conversion to convert the grayscale levels of an input video signal in each of a plurality of vertical scanning periods into grayscale levels of four or more primary colors; and an overdrive circuit (120) which sets, based on the grayscale levels that have been subjected to the multi-primary-color conversion in one vertical scanning period and on the grayscale levels that have been subjected to the multi-primary-color conversion in another vertical scanning period that is earlier than the one vertical scanning period by at least one period, the grayscale levels of the four or more primary colors in that one vertical scanning period. The present invention provides a multi-primary-color liquid crystal panel that can improve the display quality even when the input video signal has varying grayscale levels.
23 Citations
15 Claims
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1. A multi-primary-color liquid crystal panel driver comprising:
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a multi-primary-color converter which performs a multi-primary-color conversion to convert the grayscale levels of an input video signal in each of a plurality of vertical scanning periods into grayscale levels of four or more primary colors; an overdrive circuit which receives four or more color signals corresponding to the four or more primary colors and which sets, based on the grayscale levels that have been subjected to the multi-primary-color conversion in one vertical scanning period and on the grayscale levels that have been subjected to the multi-primary-color conversion in another vertical scanning period that is earlier than the one vertical scanning period by at least one period, the grayscale levels of the four or more primary colors in that one vertical scanning period; an input terminal, through which the input video signal, which contains three or more color signals corresponding to only some of the four or more primary colors, is input; and four or more bypass paths which respectively correspond to the four or more primary colors and which connect the input terminal to the overdrive circuit without passing through the multi-primary-color converter;
whereintwo of the four or more bypass paths are electrically connected together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15)
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12. An overdrive driving setting method comprising the steps of:
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providing a liquid crystal display device which includes a multi-primary-color liquid crystal panel and a multi-primary-color liquid crystal panel driver to drive the multi-primary-color liquid crystal panel, the liquid crystal panel driver including a multi-primary-color converter and an overdrive circuit; making measurement on the display of the multi-primary-color liquid crystal panel while adjusting overdrive driving for the overdrive circuit by inputting four or more grayscale level adjustable test signals to the overdrive circuit without the four or more grayscale level adjustable test signals first passing through the multi-primary-color converter; and setting a mode of the overdrive driving to get done by the overdrive circuit based on a result of the measurement on the multi-primary-color liquid crystal panel;
whereintwo of the four or more grayscale level adjustable test signals have a same magnitude.
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Specification