Patent ID: 6894670

Claim:
A liquid crystal display apparatus for displaying an image on a liquid crystal cell through a liquid crystal driver driven by a predetermined number of bits by inputting image data in which one pixel is represented with a plurality of sub-pixels, comprising: memory for storing information about an offset for converting gray level coordinates of a gamma characteristic spaced evenly according to said number of bits into gray level coordinates spaced unevenly, so that the gray levels coordinates of at least one sub-pixel are spaced at a higher density between the gray level coordinates of another sub-pixel; a gray level adjustment portion for performing a calculation on particular input sub-pixel data based on information about said offset stored in said memory; and a pseudo-gray-level-expansion portion for applying pseudo gray level expansion to said sub-pixel data calculated by said gray level adjustment portion, wherein said pseudo-gray-level-expansion portion converts sub-pixel data which is converted by said gray level adjustment portion and has a larger number of bits than said number of bits of said liquid crystal driver into data which has said number of bits of said liquid crystal driver and is equivalent to data having said larger number of bits, and wherein said sub-pixel data to which the pseudo gray level expansion is applied by said pseudo-gray-level-expansion portion is supplied to said liquid crystal driver to display the image on said liquid crystal cell, whereby the number of gray scale levels which can be displayed is increased.