Timing circuit for video display having a spatial light modulato

Details Timing circuit for video display having a spatial light modulato Timing circuit for video display having a spatial light modulato

1994-01-27

1996-06-18

Metjahic, Safet

Television

Video display

Color sequential

348536, 348514, 348520, H04N 912

Patent

active

055283179

ABSTRACT:
A method and apparatus for synchronizing display timing in a digital television system with a pixel addressable display having a color wheel is disclosed. The display timing circuit 22 includes phase comparator 40, for comparing the phase of a wheel index signal generated by a color wheel 20 with the phase of a frame synchronization signal indicating that a complete frame is ready to be displayed. Display timing circuit 22 further comprises a color wheel synchronization generator 42 which generates a color wheel synchronization signal in response to a phase difference value produced by phase comparator 40. The color wheel synchronization signal is used to increase, decrease, or maintain the speed of color wheel 20 to achieve a known phase relationship between the frame synchronization signal and the wheel index signal. Display timing circuit 22 further comprises a clock generator applicable to generate a display master clock signal having a known frequency relation to the wheel index signal.

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T. J. Dennis, B. A., "Field-Sequential Colour Television Receiver." Wireless World, Sep. 1971, vol. 77, No. 1431, pp. 443-446.

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