Transmission-type display device with a heat-dissipating glass plate external to at least one liquid crystal substrate

• US 5,757,443 A
• Filed: 10/11/1996
• Issued: 05/26/1998
• Est. Priority Date: 10/13/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kobayashi, Mikiya
• Primary Examiner(s): GROSS, ANITA P
• Application Number:
  US08/730,014
• Time in Patent Office: 592 Days
• Field of Search: 349/122, 349/158, 349/161, 349/5
• US Class Current: 349/5
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers

Abstract

A transmission-type display device including: a first transparent substrate having pixel electrodes and switching elements formed thereon, each of the pixel electrodes being connected to the respective switching element; a second transparent substrate having a counter electrode formed thereon and being positioned opposite to the first transparent substrate in such a manner as to leave a gap therebetween; a liquid crystal layer held in the gap between the first transparent substrate and the second transparent substrate; and a heat-dissipating glass plate of a thermal conductivity of 1 W/m·K or more and a thickness of 1 mm or more arranged at the outer surface of at least the first transparent substrate constructed in such a manner that picture quality does not deteriorate even if dust becomes attached to the liquid crystal panel or lens. Instead, the heat-dissipating glass plate can be bonded to the outer surface of the first transparent substrate in such a manner as to leave a gap of width of 2 mm or less between the heat-dissipating glass plate and the first transparent substrate.

Claims

1. A transmission-type display device comprising:

a first transparent substrate having pixel electrodes and switching elements formed thereon, each of said pixel electrodes being connected to the respective switching element;

a second transparent substrate having a counter electrode formed thereon and being positioned opposite to said first transparent substrate in such a manner as to leave a gap therebetween;

a liquid crystal layer held in said gap; and

a heat-dissipating glass plate of a thermal conductivity of 1 W/m·

K or more and a thickness of 1 mm or more arranged at the outer surface of at least said first transparent substrate.

2. A transmission-type display device according to claim 1, wherein there is only one heat-dissipating glass plate, and said heat-dissipating glass plate is adhered to the outer surface of said first transparent substrate.

3. A transmission-type display device according to claim 1, wherein there are two heat-dissipating glass plates, and said heat-dissipating glass plates are adhered to the outer surfaces of said first and second transparent substrates respectively.

4. A transmission-type displaying device according to claim 3, wherein a light-polarizing plate is arranged at the outer surface of said heat-dissipating glass plate adhered to the outer surface of said first transparent substrate.

5. A transmission-type displaying device according to claim 3, wherein a light-polarizing plate is arranged between said first transparent substrate and said heat-dissipating glass plate adhered to the outer surface of said first transparent substrate.

6. A transmission-type display device according to claim 1, wherein each said heat-dissipating glass plate is comprised of either quartz glass or heat-resistant glass.

7. A transmission-type display device according to claim 1, wherein there is only one heat-dissipating glass plate, and said heat-dissipating glass plate is bonded to the outer surface of said first transparent substrate in such a manner as to leave a gap of width 2 mm or less between said heat-dissipating glass plate and said first transparent substrate.

8. A transmission-type display device according to claim 7, wherein said heat-dissipating glass plate has an antireflection film formed on each side thereof.

9. A transmission-type display device according to claim 1, wherein there are two heat-dissipating glass plates, and said heat-dissipating glass plates are bonded to the outer surfaces of said first and second transparent substrates in such a manner as to leave gaps of width 2 mm or less between said heat-dissipating glass plates and said first and second transparent substrates respectively.

10. A liquid-crystal projector comprising:

a liquid-crystal panel comprising a first transparent substrate having pixel electrodes and switching elements formed thereon, each of said pixel electrodes being connected to the respective switching element, a second transparent substrate having a counter electrode formed thereon and being positioned opposite to said first transparent substrate in such a manner as to leave a gap therebetween, a liquid crystal layer held in said gap, and a heat-dissipating glass plate of a thermal conductivity of 1 W/m·

K or more and a thickness of 1 mm or more arranged at the outer surface of at least said first transparent substrate; and

optical means for providing a light incident on said liquid-crystal panel and for enlarging and projecting light transmitted from said liquid-crystal panel.

11. A liquid-crystal projector according to claim 10, wherein said optical means has a light source for providing said light incident on said liquid-crystal panel and a projecting lens for projecting said light transmitted from said liquid-crystal panel.

12. A liquid-crystal projector according to claim 10, wherein there is only one heat-dissipating glass plate, and said heat-dissipating glass plate is adhered to the outer surface of said first transparent substrate.

13. A liquid-crystal projector according to claim 10, wherein there is only one heat-dissipating glass plate, and said heat-dissipating glass plates are adhered to the outer surface of said first and second transparent substrates respectively.

14. A liquid-crystal projector according to claim 10, wherein there is only one heat-dissipating glass plate, and said heat-dissipating glass plate is bonded to the outer surface of at least said first transparent substrate in such a manner as to leave a gap of width 2 mm or less between said heat-dissipating glass plate and said first transparent substrate.

15. A liquid-crystal projector according to claim 10, wherein there are two heat-dissipating glass plates, and said heat-dissipating glass plates are bonded to the outer surfaces of said first and second transparent substrates in such a manner as to leave gaps of width 2 mm or less between said heat-dissipating glass plates and said first and second transparent substrates respectively.

16. A liquid-crystal projector according to claim 15, wherein each of said heat-dissipating glass plates has an antireflection film formed on each side thereof.