Pulsed two lamp single light valve display system
First Claim
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1. An illumination system, comprising:
- a light valve modulating a light beam impinging thereon as a function of a video signal representing a series of video frames;
a first lamp and a second lamp generating a first light source and a second light source, respectively;
optics directing said first light source and said second light source to said light valve to form said light beam;
color means for coloring said first light source a first color and for alternately coloring said second light source a second color and a third color; and
a lamp driver circuit driving said first lamp when said color means colors said first light source said first color, said lamp driver circuit driving said second lamp when said color means alternately colors said second light source both said second color and said third color.
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Abstract
A pulse driven two lamp (40, 50) single light valve (62) imaging display system (10). The first lamp (40) is used to generate red light, and the second lamp (50) is used to generate blue and green light. A beam splitter (46) combines the white light of the two light sources, and directs the light to a color wheel (26). The first red lamp (40) is driven at a peak power being 3X the average power rating of the lamp for ⅓ of a video frame. The second blue-green lamp (50) is pulse driven at a peak power being 150% its average power rating for ⅔ of a video frame. The present invention achieves improved color balance and increased intensity, and is a simple and cost effective architecture.
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Citations
13 Claims
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1. An illumination system, comprising:
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a light valve modulating a light beam impinging thereon as a function of a video signal representing a series of video frames;
a first lamp and a second lamp generating a first light source and a second light source, respectively;
optics directing said first light source and said second light source to said light valve to form said light beam;
color means for coloring said first light source a first color and for alternately coloring said second light source a second color and a third color; and
a lamp driver circuit driving said first lamp when said color means colors said first light source said first color, said lamp driver circuit driving said second lamp when said color means alternately colors said second light source both said second color and said third color. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating an illumination system as a function of a video signal representing a series of video frames, comprising the steps of:
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a) driving a first lamp a first fraction of each said video frame to generate a first light source, and driving a second lamp a second fraction of each said video frame to generate a second light source;
b) coloring said first light source a first color, and alternately coloring said second light source both a second color and a third color;
c) directing said colored first light source and said colored second light source to a light valve; and
d) modulating said colored first light source and said second light source with said light valve to form an image. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification