Display device with multilayer film between LCD and backlight

• US 6,147,723 A
• Filed: 03/01/1996
• Issued: 11/14/2000
• Est. Priority Date: 12/22/1992
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Mochizuki, Noritaka
• Primary Examiner(s): Parker, Kenneth
• Application Number:
  US08/609,213
• Time in Patent Office: 1,719 Days
• Field of Search: 359/50, 349/62, 349/65, 349/105, 349/106, 349/104
• US Class Current: 349/62
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00

Abstract

A substrate provided with a multi-layer film, the reflectance of which is incidence angle dependency is disposed between a planar light emitting body and a liquid crystal panel. Rays of light within a predetermined angle from the light emitting body are selectively caused to enter the liquid crystal panel through the substrate provided with the multi-layer film.

Claims

1. A display device comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source with an air layer interposed therebetween and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

2. An information processing apparatus comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source with an air layer interposed therebetween and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

3. A display device comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

4. An information processing apparatus comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

5. A display device comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, and wherein said light source includes a transparent plate having a scattering surface on a front surface, a reflection surface on a rear surface, and a lamp, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

6. An information processing apparatus comprising:

a liquid crystal light valve; and

illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, and wherein said light source includes a transparent plate having a scattering surface on a front surface, a reflection surface on a rear surface, and a lamp, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

7. A display device comprising:

a liquid crystal light valve; and

an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

8. An information processing apparatus comprising:

a liquid crystal light valve; and

an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

9. An illuminating device comprising:

a wave guide plate type planar light source; and

a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with

said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

10. A display device comprising:

a liquid crystal light valve; and

an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

11. An information processing apparatus comprising:

a liquid crystal light valve; and

an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.

12. An illuminating device comprising:

a light source;

a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.