Optical system for liquid crystal projector
First Claim
1. An optical system for a liquid crystal projector, comprising:
- a light source of high luminance for emitting a light;
a polarized light prism for separating the light into polarized light of visible rays of three components having been emitted from said light source by reflection and transmitting the light in accordance with the polarized light of visible rays of three components, said polarized light prism being disposed at a front of said light source and spaced apart from said light source by a predetermined distance;
first reflecting means for selectively reflecting one component of the polarized light of visible rays of three components from said polarized light prism and allowing the two remaining components to pass therethrough;
second reflecting means for reflecting one of the two remaining components of the polarized light of visible rays of three components from said polarized light prism toward a first liquid crystal display panel by a first reflection mirror and reflecting the other of the two remaining components toward said polarized light prism by a second liquid crystal display panel;
composing means for composing the incident light having been reflected by said first and second reflecting means thereto into a composed color image; and
projecting means for projecting said composed color image on a screen, said projecting means being arranged at a side of said polarized light prism;
said first reflecting means including,a first liquid crystal display for transmitting a polarized light transmitted from said polarized light prism, anda reflection mirror for transmitting a component besides a predetermined color component and reflecting a predetermined color component of the polarized light transmitted from said liquid crystal display, said reflection mirror being disposed at a rear surface of said liquid crystal display.
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Accused Products
Abstract
An optical system of a liquid crystal projector includes a metal halide lamp as a light source of a high luminance, a polarized light prism for separating the light from the metal halide lamp into respective light elements of the visible rays in accordance with spectral characteristics of the light, a heat absorption filter for filtering off other rays except for the visible rays from the light in order to remove heat which is generated from the other rays, reflection liquid crystal panels which are each arranged at the front side or at a side of the polarized light prism and having a red, green or blue light reflection mirror mounted on the rear surface thereof, and a projection lens for composing the incident light elements from the liquid crystal panels into a composed color image and then projecting the composed color image on a screen. The light source emits a light having spectral characteristics in that the radiation of the red light element thereof is less intense than those of the green and the blue light elements, for thereby improving the color tone of the image. The polarized light prism and the reflection liquid crystal panels causes the optical path of the optical system to be shorter, for thereby improving the resolution of the color of the image and for also simplifying the construction of the optical system.
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Citations
5 Claims
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1. An optical system for a liquid crystal projector, comprising:
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a light source of high luminance for emitting a light; a polarized light prism for separating the light into polarized light of visible rays of three components having been emitted from said light source by reflection and transmitting the light in accordance with the polarized light of visible rays of three components, said polarized light prism being disposed at a front of said light source and spaced apart from said light source by a predetermined distance; first reflecting means for selectively reflecting one component of the polarized light of visible rays of three components from said polarized light prism and allowing the two remaining components to pass therethrough; second reflecting means for reflecting one of the two remaining components of the polarized light of visible rays of three components from said polarized light prism toward a first liquid crystal display panel by a first reflection mirror and reflecting the other of the two remaining components toward said polarized light prism by a second liquid crystal display panel; composing means for composing the incident light having been reflected by said first and second reflecting means thereto into a composed color image; and projecting means for projecting said composed color image on a screen, said projecting means being arranged at a side of said polarized light prism; said first reflecting means including, a first liquid crystal display for transmitting a polarized light transmitted from said polarized light prism, and a reflection mirror for transmitting a component besides a predetermined color component and reflecting a predetermined color component of the polarized light transmitted from said liquid crystal display, said reflection mirror being disposed at a rear surface of said liquid crystal display. - View Dependent Claims (2, 3, 4, 5)
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Specification