Patent ID: 8022908

Claim:
A display apparatus, comprising: control means for controlling the display of pixels constituting a screen display based on input data, wherein the screen display has a plurality of small areas; a correction memory storing correction data for eliminating unevenness in brightness among respective pixels, wherein the correction data includes (i) brightness irregularity correction data for each small area consisting of a plurality of pixels on the screen display and (ii) compression data calculated based on correction data of each pixel and the brightness irregularity correction data for each small area, wherein the compression data are entropy coded data; and correcting means for correcting brightness irregularities based on the data stored in the memory and the input data, wherein the correcting means is configured to expand the compression data and to calculate correction values based on (i) brightness irregularity correction data of at least one of the small areas stored in the correction memory and (ii) the expanded data, wherein the correcting means is configured to calculate correction values according to Equations (i) and (ii): Zo ( m,n )= zo ( m,n )− xo ( m )− yo ( n ), Equation (i): Zg ( m,n )= zg ( m,n )/( xg ( m )× yg ( n )), Equation (ii): wherein Zo(m,n) represents residual offset correction data of the pixel positioned at coordinates (m,n), zo(m,n) represents offset correction data of the pixel, xo(m) represents an average of offset correction data obtained from the pixels aligned along a vertical line at a horizontal position m, yo(n) represents an average of offset correction data obtained from the pixel aligned along a horizontal line at a vertical position n, Zg(m,n) represents residual gain correction data of the pixel, zg(m,n) represents gain correction data of the pixel, xg(m) represents an average of gain correction data obtained from the pixels aligned along a vertical line at a horizontal position m, and yg(n) represents an average of gain correction data obtained from the pixels aligned along a horizontal line at a vertical position n, where m and n are integers greater than or equal to 1.