US4929062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light guide for LCD
Assignee: Motorola Solutions Inc
•
Filing: 1988-11-02
•
Granted: 1990-05-29
•
Expires: 2008-11-02
Abstract
Abstract A display system includes a liquid crystal display, a light guide behind the display, and light emitting diodes. The light guide is a molded slab of clear material with a front display surface a rear surface and six bordering surfaces with two planes depressed into its rear surface and having two hollow half cylindrical extensions integrally molded with closed top and bottom ends. The rear surface and bordering surfaces and outer surface of the extensions are coated with reflective white paint. These extensions receive light from surface mounted LED's which are positioned directly below the extensions to redirect the light into the light guide.
Inventors
- 👤 Andrzej T. Guzik
- 👤 James H. Curtis
- 👤 Faris S. Habbaba
- 👤 Kirit Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133615
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A liquid crystal display system, comprising in combination: a liquid crystal display; two surface mounted light sources, and a light guide having a display surface positioned behind said liquid crystal display, said light guide is made from a slab of transparent plastic material substantially uniform in thickness having a front surface adjacent said crystal liquid display, a rear surface, and six bordering surfaces perpendicular to said front and rear surface, two of the bordering surfaces are substantially mutually parallel and are located at opposite ends of the slab, the other four bordering surfaces are substantially arcuate in shape, said rear surface has two rectangular plane depressions; two generally half barrel shaped concave extensions, positioned over said light sources, being carried by said ends for receiving light emitted by said light sources, substantially perpendicular to the light guide and directing it into said light guide, said arcuate bordering surface, said rear surface, and said depressed planes including the means for reflecting light.
Claim 2
Dependent Claim
161 words
A liquid crystal display system, comprising in combination: a liquid crystal display; two surface mounted light sources, and a light guide having a display surface positioned behind said liquid crystal display, said light guide is made from a slab of transparent plastic material substantially uniform in thickness having a front surface adjacent said crystal liquid display, a rear surface, and six bordering surfaces perpendicular to said front and rear surface, two of the bordering surfaces are substantially mutually parallel and are located at opposite ends of the slab, the other four bordering surfaces are substantially arcuate in shape, said rear surface has two rectangular plane depressions; two generally half barrel shaped concave extensions, positioned over said light sources, being carried by said ends for receiving light emitted by said light sources, substantially perpendicular to the light guide and directing it into said light guide, said arcuate bordering surface, said rear surface, and said depressed planes including the means for reflecting light.
Claim 3
Dependent Claim
17 words
The display system of claim 1 wherein said two surface mounted light sources are light emitting diodes.
Claim 4
Dependent Claim
15 words
The display system of claim 1 wherein said means for reflecting light comprise white paint
Claim 5
Dependent Claim
117 words
A light guide having a display surface made from a slab of transparent plastic material substantially uniform in thickness having a front, and a rear surface, and six bordering surfaces perpendicular to said front and rear surface, two of the bordering surfaces are substantially mutually parallel and are located at opposite ends of the slab, the other four bordering surfaces are substantially arcuate in shape, said rear surface has two rectangular plane depressions; two generally half barrel shaped concave extensions being carried by said ends for receiving light, substantially perpendicular to the light guide and directing it into said light guide, said arcuate bordering surface, said rear surface, and said depressed planes including means for reflecting light.
Claim 6
Dependent Claim
117 words
A light guide having a display surface made from a slab of transparent plastic material substantially uniform in thickness having a front, and a rear surface, and six bordering surfaces perpendicular to said front and rear surface, two of the bordering surfaces are substantially mutually parallel and are located at opposite ends of the slab, the other four bordering surfaces are substantially arcuate in shape, said rear surface has two rectangular plane depressions; two generally half barrel shaped concave extensions being carried by said ends for receiving light, substantially perpendicular to the light guide and directing it into said light guide, said arcuate bordering surface, said rear surface, and said depressed planes including means for reflecting light.
Claim 7
Dependent Claim
13 words
The light guide of claim 4 wherein the reflective means comprise white paint.
References Cited (Backward Citations)
US4118111A
Cited
US4258643A
Cited
US4282560A
Cited
US4630895A
Cited
US4714983A
Cited
US4770499A
Cited
US4755035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |