Patent ID: 6271825
Filing Date: 2001-08-07
Classification: G09G,H04N

Abstract:
A method for correcting spatial non-uniformities in luminance outside of a predetermined luminance variation detection range in order to provide a tiled, color flat-panel display with the appearance of having a uniform brightness, said method comprising the steps of:a) providing a tiled, color, flat-panel display capable of displaying moving images at a predetermined refresh rate, comprising a plurality of individual display tiles having seams therebetween, each of said individual display tiles comprising an array of color pixel elements, each pixel element comprising an individual color space having color coordinate and being adapted to receive a data stream and altering its color characteristics in response thereto, said color, flat-panel display exhibiting gradual non-uniformities or abrupt non-uniformities in luminance;b) measuring the primary luminance variations between at least two of said individual color spaces associated with at least two of said color pixels of said tiled, color, flat-panel display;c) determining tristimulus values associated with said measured luminance variations of step (b);d) electronically storing values representative of said tristimulus values;e) using luminance scaler/adder means operatively connected to said tiled, color, flat-panel display to receive a continuous video input signal and to recompute color coordinates, in accordance with said electronically stored values, at substantially said predetermined refresh rate to produce a normalized data stream; andf) selectively applying said normalized data stream to display controller means operatively connected to at least one of: row driver means and column driver means, operatively connected to at least one of said pixels, thereby adjusting primary luminances of color spaces associated with said pixels in said tiled, color, flat-panel display which will result in matching of the luminances of said two pixels thereby correcting spatial non-uniformities in the luminance between said pixels of said tiled, color flat panel display in accordance with a gradient rule, whereby spatial non-uniformities in luminance are reduced below said predetermined detection range.