Phase error control for color wheel

Details Phase error control for color wheel Phase error control for color wheel

1995-06-13

1997-11-25

Peng, John K.

Television

Video display

Color sequential

348514, 348524, 348537, H04N 912, H04N 9475

Patent

active

056917805

ABSTRACT:
A motor control unit (15c) for synchronizing a color wheel (15) to an incoming video signal and for re-synchronizing the color wheel after a channel change. The motor control unit (15c) has an error control unit (31), which detects an out-of-phase condition, and derives a color wheel sync signal from the pixel sample clock adjusted by any phase error. A drive unit (33) phase locks this sync signal to an index signal provided by the color wheel. The result is a tightly controlled re-synchronization that minimizes perceived effects.

REFERENCES:
patent: 2645678 (1953-07-01), Christensen
patent: 5079544 (1992-01-01), Demond
patent: 5138454 (1992-08-01), Parulski
patent: 5365283 (1994-11-01), Doherty et al.
patent: 5367337 (1994-11-01), Pyle et al.
patent: 5448314 (1995-09-01), Heimbuch
patent: 5452024 (1995-09-01), Sampsell
patent: 5526051 (1996-06-01), Gove

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