Color phase control for projection display using spatial light m

Details Color phase control for projection display using spatial light m Color phase control for projection display using spatial light m

1993-07-19

1994-11-15

Powell, Mark R.

Television

Video display

Color sequential

348514, 348520, H04N 914, H04N 947

Patent

active

053652835

ABSTRACT:
A SLM-based projection display system (10) samples and processes video data for delivery to a spatial light modulator (SLM) (13c), and uses a color wheel (14a) to color the SLM-generated images. A frame memory (13b) provides data to the SLM (13c) and is managed so that, if the phase of the incoming video signal changes, a desired phase relationship between the color wheel position and the data available to the SLM (13c) can be maintained. Also, a motor control unit (15a) uses a horizontal sync signal to generate a drive signal for the color wheel motor (16a), which limits the transient time during phase-changing events, and which provides a means for adjusting the phase of the drive signal.

REFERENCES:
patent: 3821793 (1974-06-01), Carson
patent: 4197559 (1980-04-01), Gramling
patent: 4203135 (1980-05-01), Sasaki
T. J. Dennis, "Field-Sequential Colour Television Receiver", Wireless World, vol. 77, No. 1431, Sep. 1971.

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