Liquid crystal projector

• US 20040114249A1
• Filed: 09/25/2003
• Published: 06/17/2004
• Est. Priority Date: 08/27/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nagaya, Michio, Uno, Naoko, Akaike, Yosufumi, Nishihara, Shizuo
• Granted Patent: US 6,834,964 B2
• Time in Patent Office: Days
• US Class Current: 359/617
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G03B 21/006 using LCD's
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10
• CPC Class Codes: H04N 9/3144 Cooling systems cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16

Abstract

The present invention provides a liquid crystal projector including a plurality of liquid crystal panels (1) for modulating a plurality of color lights respectively, a prism (2) for compositing thus modulated plural color lights to generate a color image, and an optical system for magnifying and projecting thus generated color image, wherein the liquid crystal panels (1) are directly adhered to metal hold plates (3), and the metal hold plates (3) are fixed to the prism (2) such that the emergent surfaces of the liquid crystal panels (1) face the incident surfaces of the prism (2). The liquid crystal panels (1) have glass sheets (7) having thermal conductivity fixed to the incident surfaces thereof. Radiation fins (8) are fixed to the prism (2) with the metal hold plates (3) and the glass sheets (7) having thermal conductivity brought into contact with the fins (8). A closed space is provided between the incident surfaces of the prism (2) and the emergent surfaces of the liquid crystal panels (1) so as to prevent air flow.

Claims

1. A liquid crystal projector, comprising:

a plurality of liquid crystal panels for modulating a plurality of color lights, respectively;

a prism for compositing thus modulated plural color lights to generate a color image; and

an optical system for magnifying and projecting thus generated color image;

wherein

the liquid crystal panels are directly adhered to metal hold plates, and

the metal hold plates are fixed to the prism such that the emergent surfaces of the liquid crystal panels face the incident surfaces of the prism.

2. The liquid crystal projector as set forth in claim 1, wherein the liquid crystal panels have glass sheets having thermal conductivity fixed to the incident surfaces thereof.

3. The liquid crystal projector as set forth in claim 1, wherein radiation fins are fixed to the prism with the metal hold plates and the glass sheets having thermal conductivity brought into contact with the fins.

4. The liquid crystal projector as set forth in claim 1, wherein a closed space is provided between the incident surfaces of the prism and the emergent surfaces of the liquid crystal panels, and at least polarizing plates are arranged in the closed space.

5. The liquid crystal projector as set forth in claim 4, wherein the polarizing plates are arranged at the incident sides of the prism, and thermal conduction members for absorbing heat generated in the polarizing plates are arranged in the closed space provided between the incident surfaces of the prism and the emergent surfaces of the liquid crystal panels.