Light valve image projection apparatus
First Claim
1. A light valve image projection apparatus for projecting an optical image of a video signal, said apparatus comprising:
- light valve means for forming an optical image from a video signal and for adjusting the degree to which the formed image can be transmitted therefrom by light rays;
a light source which irradiates the optical image formed by said light valve means with light rays; and
projection lens means for projecting the optical image transmitted from said light valve means onto a projection screen in an expanded projection manner, said projection lens means having an optical axis, a group of lenses each concentric to the optical axis, and a stop forming the aperture of the projection lens means at a position decentered from the optical axis of said projection lens means.
1 Assignment
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Accused Products
Abstract
A light valve image projection apparatus includes a light source, field lens, liquid crystal panel, a projection lens assembly, and projection screen. The projection lens has a stop forming an aperture of the lens assembly decentered from the optical axis of the lenses of the projection lens assembly in the vertical scanning direction of the liquid crystal panel. Principal rays are approximately parallel to each other within the effective field angle on the side of the liquid crystal cell. In the light valve image projection apparatus principal rays, parallel to each other, are irradiated on the liquid crystal panel at an angle resulting in the highest contrast ratio to produce a projected image having uniformity and high contrast.
43 Citations
27 Claims
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1. A light valve image projection apparatus for projecting an optical image of a video signal, said apparatus comprising:
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light valve means for forming an optical image from a video signal and for adjusting the degree to which the formed image can be transmitted therefrom by light rays; a light source which irradiates the optical image formed by said light valve means with light rays; and projection lens means for projecting the optical image transmitted from said light valve means onto a projection screen in an expanded projection manner, said projection lens means having an optical axis, a group of lenses each concentric to the optical axis, and a stop forming the aperture of the projection lens means at a position decentered from the optical axis of said projection lens means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light valve image projection apparatus for projecting an optical image of a video signal, said apparatus comprising:
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a light valve consisting of three image forming panel means each for forming an optical image from a video signal and for adjusting the degree to which the formed image can be transmitted therefrom by light rays; a light source which irradiates the optical image formed by each of the panel means of said light valve with light rays; color separating means for separating the light rays radiating from said light source into three light rays of the primary colors, respectively, and for directing the three rays to the three image forming panel means, respectively; color combining means for combining the optical images formed by said light valve; and projection lens means for projecting the optical image transmitted form said light valve onto a projection screen in an expanded projection manner, said projection lens means having an optical axis, a group of lenses each concentric to the optical axis, and a stop forming the aperture of the projection lens means at a position decentered from the optical axis of said projection lens means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A light valve image projection apparatus for projecting an optical image of a video signal, said apparatus comprising:
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a light valve consisting of three image forming panel means each for forming an optical image from a video signal and for adjusting the degree to which the formed image can be transmitted therefrom by light rays; a light source which irradiates the optical image formed by each of the panel means of said light valve with light rays; color separating means for separating the light rays radiating from said light source into three light rays of the primary colors, respectively, and for directing the three rays to the three image forming panel means, respectively; and projection lens means for projecting the optical image transmitted form said light valve onto a projection screen in an expanded projection manner, said projection lens means having an optical axis, a group of lenses each concentric to the optical axis, and a stop forming the aperture of the projection lens means at a position decentered from the optical axis of said projection lens means. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification