Television – Video display – Color sequential
Patent
1994-05-26
1995-06-27
Kostak, Victor R.
Television
Video display
Color sequential
348744, H04N 931
Patent
active
054284082
ABSTRACT:
A color correction system for a video projection system utilizing a single light valve for modulating light impinging thereon with a video signal and three projection lamps, one for each of the primary colors, which are activated sequentially. Positioned in the light path between two of the lamps and the light valve are occluders which block and unblock the light output from their associated lamp. The lamps which have the occluders are operated such that each lamp may be driven with a series of non-occluded pulses and occluded pulses. The occluded pulses occur when the occluder blocks the light output from the lamp. The more a desired reduction in light output in one of the colors is required, the non-occluded pulses are reduced and the corresponding occluded pulses are increased. This permits adjustment of the colorimetry of the system without adversely affecting the electrical properties of the lamp. As such, the electrical power input to each of the lamps remains within operational parameters but the light output of a particular color as seen by the light valve, and thus the viewer, may be reduced.
REFERENCES:
patent: 2530107 (1950-11-01), Webb
patent: 5233338 (1993-08-01), Surguy
Balconi-Lamica Michael J.
Flynn Nathan J.
Kostak Victor R.
Philips Electronics North America Corporation
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