Computer graphics processing and selective visual display system – Plural display systems – Tiling or modular adjacent displays
Patent
1996-11-05
2000-03-28
Brier, Jeffery
Computer graphics processing and selective visual display system
Plural display systems
Tiling or modular adjacent displays
345 88, 348655, 348675, 348744, G09G 500, G09G 336, H04N 5202, H04N 564
Patent
active
060437979
ABSTRACT:
A liquid crystal display ("LCD") projection unit (12) employs a luminance and color balance system having a lookup table (100) storing multiple sets of gain and/or gamma corrected responses (92-99) for color balance and luminance control. The lookup table values are determined by measuring an S-curve response (90) of an LCD array (40) for each of a set of R, G, and B input data values, converting the S-curve responses to a corresponding set of gamma responses, and scaling the gamma responses to generate red ("R"), green ("G"), and blue ("B") families of gain and gamma corrected values. Color balance is adjusted by selecting the particular R, G, and B families of gain and gamma corrected values that cause the LCD projection unit to match a predetermined ratio of maximum R, G, and B luminance values. Luminance is adjusted by selecting families of lookup table values that adjust the transmittance of the LCD while maintaining the color balance. The LCD projection unit achieves a uniform luminance and color balance that renders it suitable for use in a multiscreen display system (10).
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Clifton Benjamin R.
Fogarty John P.
Gulick Paul E.
Brier Jeffery
Clarity Visual Systems, Inc.
Lewis David L.
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