Television – Video display – Color sequential
Patent
1996-06-13
1998-06-30
Lee, Michael H.
Television
Video display
Color sequential
348771, H04N 912
Patent
active
057741964
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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08/371,348 "DMD Modulated Continuous Wave Light Source for Zerographic Printer" Filed Jan. 11, 1995.
08/373,692 "Monolithic Programmable Format Pixel Array" filed Jan. 17, 1995.
08/414,707 "Spatial Light Imaging System with Synchronized and Modulated Light Source" filed Mar. 31, 1995.
Desir Jean W.
Donaldson Richard L.
Kesterson James C.
Klinger Robert C.
Lee Michael H.
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