Claims
- 1. A liquid crystal display device, comprising:a liquid crystal display including a reflector; and an illumination device arranged at the front side of the liquid crystal display, the illumination device comprising: a light-guide plate with transparency having a first face on which a optical extraction structure is formed and a second face being opposite to the first face; and a light source facing the second face of the light guide plate so as to introduce light in the light-guide, wherein the second face is adapted to face the liquid crystal display, wherein the optical extraction structure include a plurality of convex elements.
- 2. The illumination device according to claim 1, wherein the elements are distributed relatively sparsely in the vicinity of the light source and progressively more densely going away from the light source.
- 3. The illumination device according to claim 1, wherein a light illuminated from the light source is output through the second face, is reflected by the reflector, passes through the light-guide plate, and is output from the first face.
- 4. The illumination device according to claim 1, wherein the optical extraction structure includes an inclined face of less than 30°.
- 5. The illumination device according to claim 1, wherein the light source is selected from a group consisting of an LED, a light bulb and a fluorescent light.
- 6. The illumination device according to claim 1, wherein the diameter of a bottom face of the optical extraction structure is more than 5 μm and less than 300μ in size.
- 7. The illumination device according to claim 1, further comprising a reflector provided on at least one end of the light-guide plate other than the end where the light source faces.
- 8. The illumination device according to claim 1, further comprising a transparent plate provided at the first face, wherein a gap is formed between the first face and the transparent plate.
- 9. The illumination device according to claim 1, wherein the light source faces an end face of the light-guide plate.
Priority Claims (7)
Number |
Date |
Country |
Kind |
8-252094 |
Sep 1996 |
JP |
|
8-303389 |
Nov 1996 |
JP |
|
8-342224 |
Dec 1996 |
JP |
|
8-350199 |
Dec 1996 |
JP |
|
9-001586 |
Jan 1997 |
JP |
|
9-023862 |
Feb 1997 |
JP |
|
9-063658 |
Mar 1997 |
JP |
|
Parent Case Info
This is a Continuation of application Ser. No. 09/068,931 filed May 21, 1998 now abandoned (U.S. National Stage of PCT/JP97/03388, filed Sep. 24, 1997). The entire disclosure of the prior application is hereby incorporated by reference herein in its entirety.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
06324331 |
Nov 1994 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/068931 |
|
US |
Child |
10/431541 |
|
US |