Method of driving flat panel display apparatus for multi-gradation display
First Claim
1. A method of driving a flat panel display apparatus for multi-gradation display whereinsetting each of a plurality of subfield periods to a pixel lighting period in accordance with a relative brightness ratio in one field period constituted of said plurality of subfield periods to display a desired brightness,dividing multiple gradations into a plurality of gradation groups between a lower brightness and a higher brightness, determining to which of said plurality of gradation groups a brightness level indicated by original image data belongs,selecting either one of a plurality of subfield period groups which are prepared by combining predetermined subfield periods of said plurality of subfield periods, by determining to which one of said plurality of gradation groups said original image data belongs, so that a difference in brightness between gradations in a gradation group on a lower brightness side among said plurality of gradation groups is smaller than a difference in brightness between gradations in a gradation group on a higher brightness side,associating said original image data with the respective subfield periods in said selected subfield period group, and performing the multi-gradation display by controlling lighting and non-lighting of each pixel in the subfield period.
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Abstract
There is proposed is a method of controlling a flat panel display apparatus for multi-gradation display in which a data determination portion and a subfield control portion are provided. Based on a most significant bit or an upper bit of original image data, it is determined in which one of two or more divided gradation groups the original image data is included, to select a combination of subfields in accordance with a gradation-brightness characteristic of the belonging gradation group. Using a complementary relationship with human visibility, a difference in brightness between the gradations in a low-order brightness region is reduced, and a difference in brightness between the gradations in a high-order brightness region is enlarged. Therefore, a density of brightness is uniformly recognized visually over all the brightness regions, and a good quality of display can be obtained.
74 Citations
10 Claims
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1. A method of driving a flat panel display apparatus for multi-gradation display wherein
setting each of a plurality of subfield periods to a pixel lighting period in accordance with a relative brightness ratio in one field period constituted of said plurality of subfield periods to display a desired brightness, dividing multiple gradations into a plurality of gradation groups between a lower brightness and a higher brightness, determining to which of said plurality of gradation groups a brightness level indicated by original image data belongs, selecting either one of a plurality of subfield period groups which are prepared by combining predetermined subfield periods of said plurality of subfield periods, by determining to which one of said plurality of gradation groups said original image data belongs, so that a difference in brightness between gradations in a gradation group on a lower brightness side among said plurality of gradation groups is smaller than a difference in brightness between gradations in a gradation group on a higher brightness side, associating said original image data with the respective subfield periods in said selected subfield period group, and performing the multi-gradation display by controlling lighting and non-lighting of each pixel in the subfield period.
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3. A method of driving a flat panel display apparatus wherein
setting each of a plurality of subfield periods to a pixel lighting period in accordance with a relative brightness ratio in one field period constituted of a plurality of subfield periods to display a desired brightness, and controlling lighting and non-lighting of each pixel in said plurality of subfield periods, thereby controlling the total lighting time of each pixel in said one field period to perform multi-gradation display, multiple gradations being divided into a plurality of gradation groups between a lower brightness and a higher brightness, and a difference in brightness between gradations in a gradation group on a lower brightness side being made smaller than a difference in brightness between gradations in a gradation group on a higher brightness side.
Specification