Method and apparatus of aligning color modulation data to color wheel filter segments
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
Jun 13, 1996
filing date -
Jun 13, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus (10) of aligning color modulation data to color wheel filter segments (13) in a field sequential color spatial light modulator display system. A color wheel (12) having a plurality of colored segments (13) joined at spokes (14) is rotated before a narrow light beam (20). The colored light (22) is observed until light of a mixed color is detected, this light of mixed color corresponding to light of equal portions from the two segments adjacent the spoke. The time between a wheel marker (42) is detected and when the predetermined mixed color is observed is measured. Optical sensors (50) can be utilized to sense a mixed color, such as magenta derived from the combination of a red/blue transition, but also can be done manually by briefly illuminating the wheel to visually ascertain this predetermined color. By calibrating the display system to know precisely where the spokes (14) are, referenced in time to when a wheel marker (42) is detected, colored modulation data for each colored segment is only fed to the SLM (26) during the time the corresponding color filter is in the light path.
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