Projection-type color display device with light valves positioned at unequal distances from the light source
First Claim
1. A projection-type display device comprising:
- a light source for producing light having a plurality of colors;
segregating means for segregating the light into the plurality of colors including at least a first color and a second color; and
liquid crystal light valve means including at least a first light valve and a second light valve, said first light valve positioned to receive said first color and said second light valve positioned to receive said second color;
wherein the optical lengths from the light source to the first light valve and from the light source to the second light valve are unequal and are based on the luminous intensities of the first color and the second color, respectively.
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Accused Products
Abstract
A projection-type display device for producing a well balanced color image without the use of a neutral density filter. The device includes three liquid crystal light valves associated with the three primary colors and two dichroic mirrors. A light source generates colored light. The optical length between the light source and the light valve associated with the primary color of the colored light having the highest level of luminous intensity is greater than the optical lengths between the light source and each of the other two light valves. One of the three liquid crystal light valves is driven by circuitry to produce an image which is a mirror image of the images produced by the other two light valves.
67 Citations
51 Claims
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1. A projection-type display device comprising:
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a light source for producing light having a plurality of colors; segregating means for segregating the light into the plurality of colors including at least a first color and a second color; and liquid crystal light valve means including at least a first light valve and a second light valve, said first light valve positioned to receive said first color and said second light valve positioned to receive said second color; wherein the optical lengths from the light source to the first light valve and from the light source to the second light valve are unequal and are based on the luminous intensities of the first color and the second color, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for displaying an image projected from a liquid crystal display device which includes a first liquid crystal light valve, a second liquid crystal light valve and a third liquid crystal light valve, comprises:
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segregating light produced by a light source into its primary colors; positioning segregating means within the device so that the optical lengths between the light source and the three liquid crystal light valves are unequal and based on the luminous intensity of the primary color associated with the respective light valve produced by the light source; producing a first image from the first liquid crystal valve, a second image from the second liquid crystal liquid valve and a third image from the third liquid crystal light valve; and controlling the images produced by the liquid crystal light valves whereby the first image is a mirror image of the second image and the third image.
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Specification