Color phase control for projection display using spatial light modulator
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United States of America Patent
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-
Nov 15, 1994
Grant Date -
N/A
app pub date -
Jul 19, 1993
filing date -
Jul 19, 1993
priority date (Note) -
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status (Latency Note)
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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.
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