Correction methods for brightness in electronic display

A method for correcting spatial non-uniformities in luminance outside of a predetermined luminance variation detection range, said spatial non-uniformities being gradual non-uniformities, or abrupt non-uniformities arising in an electronic color, flat-panel display having a plurality of tiles comprising color pixels, each pixel comprising an individual color space and being adapted to vary a color characteristic in response to a varying drive signal, in order to provide the tiled, color, flat-panel display with the appearance of having a uniform brightness, said method comprising the steps of:

• a) measuring primary luminance variations across predetermined color spaces, each having color coordinates, associated with said color pixels of a tiled, color, flat-panel display;
• b) determining tristimulus values associated with said measured primary luminance variations of step (a);
• c) electronically storing values representative of said tristimulus values;
• d) modifying said electronically stored values by applying a gradient rule thereto, resulting in modified, electronically stored values;
• e) using luminance scaler/adder means operatively connected to said flat-panel display to receive a continuous video input signal and to recompute color coordinates, in accordance with said modified, electronically stored values, at a predetermined refresh rate associated with said flat-panel display to produce a normalized data stream;
• and
• f) selectively applying said normalized data stream to at least one of said pixels for adjusting primary luminances for pixels for adjusting primary luminances of color spaces associated with said pixels in said tiled, flat-panel display by adjusting said normalized data stream applied to color pixels in said tiled, color, flat-panel display, which will result in reducing spatial non-uniformities in the luminance of said tiled, color, flat-panel display to below said predetermined luminance variation detection range, thereby facilitating visually imperceptible seams between the tiles of said display.

A method for self-calibrating 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 luminance, said method comprising the steps of:

• a) providing a tiled, color flat-panel display comprising individual display tiles having seams therebetween, said individual display tiles comprising arrays of color pixels that vary a color characteristic in response to a data stream applied thereto to vary a display color, said color, flat-panel display exhibiting gradual non-uniformities or abrupt non-uniformities in luminance, said color, flat-panel display having built-in luminance calibration capability;
• b) measuring primary luminance variations across predetermined color pixels each having an individual color space associated therewith, of said tiled, flat panel color display;
• c) determining tristimulus values associated with said measured primary 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 modify a continuous video input signal in accordance with said electronically stored values, at a predetermined refresh rate to produce a normalized data stream;
• f) calibrating primary luminances for selected pixels in said tiled, color flat panel display by applying said normalized data stream to at least one of said color pixels, to calibrate spatial non-uniformities in the luminance of said tiled, color flat panel display.