Projection type liquid crystal displaying device
First Claim
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1. A projection type liquid crystal displaying device comprising:
- an optical system for splitting the light emitted from a light source into beams of substantially parallel light of two groups which are orthogonal to each other;
a first reflection optical system for reflecting beams of the light of one group at a right angle so that they travel in the same direction as that of the other group;
a first liquid crystal panel provided on a light path extending from said first reflection optical system;
a first dichroic mirror orthogonally reflecting the light having specified wavelengths among beams of the light of the other group which come from said optical system and admitting the light having other wavelengths;
a second liquid crystal panel provided on a light path for the light reflected on said first dichroic mirror;
a second dichroic mirror admitting the light which passes through said first liquid crystal panel and reflecting the light which transmits said second liquid crystal panel so as to synthesize beams of such light;
a third liquid crystal panel provided on a light path for the light transmitting said first dichroic mirror;
a second reflection optical system for reflecting the light transmitting said third liquid crystal panel at a right angle;
a third dichroic mirror for synthesizing the reflected light from said second reflection optical system with the transmitted light from said second dichroic mirror; and
a projection lens system for projecting beams of the light which are synthesized by said third dichroic mirror.
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Abstract
A projection type liquid crystal display device includes a light source and condenser lenses for emitting two beams of light which are orthogonal to each other. One of the light beams passes through a liquid crystal panel of one color, and the other light beam is further divided into two light beams each of which passes through liquid crystal panels of other colors. The three light beams are then synthesized by dichroic mirrors and fed to a projection lens system.
75 Citations
1 Claim
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1. A projection type liquid crystal displaying device comprising:
- an optical system for splitting the light emitted from a light source into beams of substantially parallel light of two groups which are orthogonal to each other;
a first reflection optical system for reflecting beams of the light of one group at a right angle so that they travel in the same direction as that of the other group;
a first liquid crystal panel provided on a light path extending from said first reflection optical system;
a first dichroic mirror orthogonally reflecting the light having specified wavelengths among beams of the light of the other group which come from said optical system and admitting the light having other wavelengths;
a second liquid crystal panel provided on a light path for the light reflected on said first dichroic mirror;
a second dichroic mirror admitting the light which passes through said first liquid crystal panel and reflecting the light which transmits said second liquid crystal panel so as to synthesize beams of such light;
a third liquid crystal panel provided on a light path for the light transmitting said first dichroic mirror;
a second reflection optical system for reflecting the light transmitting said third liquid crystal panel at a right angle;
a third dichroic mirror for synthesizing the reflected light from said second reflection optical system with the transmitted light from said second dichroic mirror; and
a projection lens system for projecting beams of the light which are synthesized by said third dichroic mirror.
- an optical system for splitting the light emitted from a light source into beams of substantially parallel light of two groups which are orthogonal to each other;
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Current AssigneeSeiko Precision Incorporated (Seiko Group Corp.)
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Original AssigneeSeikosha Co., Ltd.
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InventorsTakahashi, Shingo, Takahashi, Tomoaki, Tanaka, Sakae, Yamaoka, Tadahiko
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Primary Examiner(s)Miller, Stanley D.
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Assistant Examiner(s)Phan, Trong Quang
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Application NumberUS07/070,789Time in Patent Office553 DaysField of Search350/337, 350/352, 350/397, 350/385, 350/408, 350/342, 353/34, 353/37US Class Current349/9CPC Class CodesG03B 21/006 using LCD'sH04N 9/3167 for polarizing the light be...
