Cooling device for liquid crystal projectors

• US 6,523,959 B2
• Filed: 12/14/2001
• Issued: 02/25/2003
• Est. Priority Date: 03/22/2001
• Status: Active Grant

• Current Assignee: Display Vectors LLC (Jeffrey M. Gross)
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chang, Yuan-Jen, Lee, Wen-Tsung
• Primary Examiner(s): DOWLING, WILLIAM C
• Application Number:
  US10/014,437
• Publication Number:
  US 20020135741A1
• Time in Patent Office: 438 Days
• Field of Search: 353/52, 353/54, 353/61, 353/57, 353/60, 349/161
• US Class Current: 353/52
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating

Abstract

A cooling device of liquid crystal projector is utilized to cool a liquid crystal panel and polarizer of an optical system in a liquid crystal projector; when the optical system of the present invention is heated by a light projection, coolant will carry the heat of the liquid crystal panel and polarizer of the optical system away, and a flow guiding device is used to lead the coolant to flow so as to cool the high temperature coolant by means of a heat dissipating device, then the heat is dissipated to outside environment thereby. After the temperature of the coolant is lowered, it is led to flow through the liquid crystal panel and polarizer again by means of the flow-guiding device, so as to repeat a cooling cycle.

Claims

1. A cooling device of liquid crystal projector, comprising:

a container, having a upper wall, a lower wall and a front and rear wall enabling light to penetrate through it, and transmitting fluid is filled in said container, the front side of said upper wall, connecting with said front wall face, having a plurality of grooves separated by a plurality of protruding parts, and a place of said lower wall corresponding to the front side of said upper wall having a plurality of grooves separated by said protruding parts;

a flow guiding system, disposed in said container, comprising an inlet flow guiding plate and exit flow guiding plate at the front side of said wall face;

a optical system, disposed in said container, comprising a liquid crystal panel, a light synthesizer prism and a light examining polarizer, wherein said liquid crystal panel is disposed between said inlet flow guiding plate and exit flow guiding plate, said light synthesizer prism is disposed at a proper place of said container, and said examining polarizer is disposed between said exit flow guiding plate and light synthesizer prism; and

a heat dissipation system, disposed in said container, comprising a plurality of heat pipes disposed at the two flank sides of said liquid crystal panel, and one end of said heat pipe being disposed at a heat dissipating unit outside said container, and another end being disposed at a heat absorbing unit inside said container.

2. The device of claim 1, wherein said upper wall face comprises a plurality of grooves disposed outside said upper wall face.

3. The device of claim 1, wherein said lower wall face comprises a platform disposed inside said lower wall face.

4. The device of claim 1, wherein said flow guiding system further comprises a plurality of stirrers in said grooves.

5. The device of claim 1, wherein said optical system further comprises a linear polarization polarizer disposed outside the front wall of said container and corresponding to said liquid crystal panel.

6. The device of claim 1, wherein said heat dissipation system further comprises a plurality of heat radiating fins disposed outside said upper wall.

7. A cooling device of liquid crystal projector, comprising:

a container, having a upper wall, a lower wall and a plurality of wall at four sides enabling light to penetrate through them, and a plurality of sides of said upper wall having a plurality of grooves separated by a plurality of protruding parts, and a place of said lower wall corresponding to the front side of said upper wall face having a plurality of grooves separated by said protruding parts;

a flow guiding system, disposed in said container, comprising an inlet flow guiding plate and exit flow guiding plate at the front side of said wall face;

a optical system, disposed in said container, comprising liquid crystal panels, a light synthesizer prism and a light examining polarizers, wherein said liquid crystal panels are disposed between said inlet flow guiding plate and exit flow guiding plate, said light synthesizer prism is disposed at a proper place of said container, and said examining polarizers are disposed between said exit flow guiding plate and light synthesizer prism; and

a heat dissipation system, disposed in said container, comprising a plurality of heat pipes disposed at the two flank sides of said liquid crystal panel, and one end of said heat pipe being disposed at a heat dissipating unit outside said container, and another end being disposed at a heat absorbing unit inside said container.

8. The device of claim 7, wherein said upper wall comprises a plurality of grooves disposed outside said upper wall.

9. The device of claim 7, wherein said lower wall face comprises a platform disposed inside said lower wall face.

10. The device of claim 7, wherein said flow guiding system further comprises a plurality of stirrers in said grooves.

11. The device of claim 7, wherein said optical system further comprises linear polarization polarizers disposed outside the front wall face of said container and corresponding to said liquid crystal panel.

12. The device of claim 7, wherein said heat dissipation system further comprises a plurality of heat radiating fins disposed outside said upper wall.

13. A cooling device of liquid crystal projector, comprising:

a container, having an upper wall, a lower wall and a plurality of walls at four sides enabling light to penetrate through them;

a flow guiding system, disposed in said container, comprising an inlet flow guiding plate and exit flow guiding plate at the front side of said wall face;

a optical system, disposed in said container, comprising liquid crystal panels, a light synthesizer prism and a light examining polarizers, wherein said liquid crystal panels are disposed between said inlet flow guiding plate and exit flow guiding plate, said light synthesizer prism is disposed at a proper place of said container, and said examining polarizers are disposed between said exit flow guiding plate and light synthesizer prism; and

a heat dissipation system, disposed in said container, comprising a plurality of heat pipes disposed at the upper side of said liquid crystal panel.

14. The device of claim 13, wherein said upper wall comprises a plurality of grooves disposed outside said upper wall.

15. The device of claim 13, wherein said lower wall comprises a platform disposed inside said lower wall.

16. The device of claim 13, wherein said optical system further comprises a linear polarization polarizer disposed outside the front wall face of said container and corresponding to said liquid crystal panel.

17. The device of claim 13, wherein said heat dissipation system further comprises a plurality of heat radiating fins disposed outside said upper wall.