Compensation for edge effects and cell gap variation in tiled flat-panel, liquid crystal displays
AssigneeRainbow Displays, Inc.
InventorsRaymond G. Greene, J. Peter Krusius, Dean W. Skinner, Boris Yost
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Abstract
The present invention features procedures for correcting discoloration and brightness variations due to liquid crystal cell gap variations or other optical, electro-optical, ambient light, electronic, mechanical, and materials anomalies arising in tiled, flat-panel displays. The purpose of these corrections is to achieve a visually seamless appearance. Absolute, relative and/or smoothing corrections are implemented by performing pixel data video processing with correction data acquired from memory. Techniques for determining and applying these corrections are described.
Claims11
A method for correcting luminance and chromaticity variations caused by tile edge effects in tiled, flat-panel liquid crystal displays (LCDs), the steps comprising:
- a) providing at least two LCD tiles arranged adjacent one another with a seam therebetween, each of said tiles having an edge proximate said seam and an interior region with a plurality of pixels disposed therein, said pixels being adapted to modify transmitted light upon stimulation by respective pixel stimulation signals;
- b) mapping at least one region of said pixels in said LCD tiles, each of said pixels in said region having a similar effective T-V curve in an LCD tile;
- c) determining a transfer function for said mapped region to change one of said effective T-V curves to a predetermined, reference effective T-V curve;
- and
- d) applying an inverse of said transfer function to said pixel stimulation signals so that said pixels in said region appear to exhibit said predetermined, reference effective T-V curve.
Dependencies are inferred from the claim text.