Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-05-17
1998-05-05
Saras, Steven
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 89, 345148, 345149, G09G 336
Patent
active
057481636
ABSTRACT:
Shaded or color images are simulated using frame modulation techniques on flat panel displays having an array of binary display elements, i.e., display elements that have only two display states, an ON state and an OFF state. The timing of ON/OFF and OFF/ON state transitions of picture elements within predetermined neighborhoods through the array of display elements is coordinated such that the state transitions occur substantially uniformly in space and time during a multi-frame display sequence. Using a multi-frame sequence 16 frames in duration, 16 shades of gray may be realized on a monochrome display. The number of shades may be increased to 64 using dynamic dithering. Dithering is applied by causing the multi-frame sequence to be 64 frames in duration and dividing the multi-frame sequence into four sub-sequences each 16 frames in duration with the duty cycle of each display element during each of the four 16-frame sub-sequences being allowed to assume one of two adjacent values only such that display noise is minimized. The method may be applied to color displays in which pixel locations have illumination elements each of a different color, for example a red illumination element, a green illumination element and a blue illumination element.
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Alford William
Cirrus Logic Inc.
Saras Steven
Shaw Steven A.
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