US4826294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting device for a liquid crystal display device
Assignee: Citizen Watch Co Ltd
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Filing: 1988-03-04
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Granted: 1989-05-02
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Expires: 2008-03-04
Abstract
Abstract A device for back-lighting a liquid crystal display device has a lamp having a light emitting straight portion and a reflector plate. The reflector plate has a central portion provided under the light emitting straight portion and a pair of inclined side portions adjacent both sides of the central portion, the central portion having a total reflection surface, and each the side portion having a diffuse reflection surface.
Inventors
- 👤 Satoshi Imoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133605; G02F1/133604; G02F2201/00; G02F2201/46; G02F2201/465
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A lighting device for a liquid crystal display device having a liquid crystal display panel, comprising: a lamp having a light emitting straight portion and provided under the liquid crystal display panel; and a reflector plate having a central portion provided under the light emitting straight portion and a pair of side portions adjacent both sides of the central portion, the central portion having a substantially total reflection surface, and each the side portion having a diffuse reflection surface.
Claim 2
Dependent Claim
79 words
A lighting device for a liquid crystal display device having a liquid crystal display panel, comprising: a lamp having a light emitting straight portion and provided under the liquid crystal display panel; and a reflector plate having a central portion provided under the light emitting straight portion and a pair of side portions adjacent both sides of the central portion, the central portion having a substantially total reflection surface, and each the side portion having a diffuse reflection surface.
Claim 3
Dependent Claim
25 words
The lighting device according to claim 1 wherein the reflector plate is curved so as to surround the light emitting straight portion of the lamp.
Claim 4
Dependent Claim
28 words
The lighting device according to claim 2 wherein ratio of the area of the total reflection surface to the total area of the diffuse reflection surfaces is 1:2.
Claim 5
Dependent Claim
40 words
The lighting device according to claim 1 wherein the reflector plate has a flat portion in parallel with the liquid crystal display panel and a pair of side portions which are upwardly bent at both sides of the flat portion.
Claim 6
Dependent Claim
29 words
The lighting device according to claim 3 wherein the total reflection surface is provided on the flat portion and the diffuse reflection portions are provided on the side portions.
Claim 7
Dependent Claim
28 words
The lighting device according to claim 5 wherein ratio of the area of the total reflection surface to the total area of the diffuse reflection surfaces is 1:2.
Claim 8
Dependent Claim
31 words
The lighting device according to claim 1 wherein the reflector plate is a flexible plate having a diffuse reflection surface, and the total reflection surface is formed by attaching mirror material.
Claim 9
Dependent Claim
28 words
The lighting device according to claim 7 wherein ratio of the area of the total reflection surface to the total area of the diffuse reflection surfaces is 1:2.
Claim 10
Dependent Claim
36 words
The lighting device according to claim 1 wherein the reflector plate is a flexible plate having a total reflection surface, and each diffuse reflection surface is formed by attaching a plate having a diffuse reflection surface.
Claim 11
Dependent Claim
16 words
The lighting device according to claim 1 further comprising a holder for holding the reflector plate.
Claim 12
Dependent Claim
28 words
The lighting device according to claim 1 wherein ratio of the area of the total reflection surface to the total area of the diffuse reflection surfaces is 1:2.
Claim 13
Dependent Claim
18 words
The lighting device according to claim 1 wherein the lamp has a plurality of light emitting straight portions.
Claim 14
Dependent Claim
28 words
The lighting device according to claim 12 wherein ratio of the area of the total reflection surface to the total area of the diffuse reflection surfaces is 1:2.
References Cited (Backward Citations)
US4334734A
Cited
US4618216A
Cited
US4562517A
Cited
US4646158A
Cited
US4748546A
Cited
JPH05313166A
Cited
JPH06227329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |