US4660936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement to minimize reflected ambient light in a display
Assignee: RCA Corp
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Filing: 1986-08-20
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Granted: 1987-04-28
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Expires: 2006-08-20
Abstract
Abstract A display comprises means for changing the polarization of light, such as a liquid crystal cell, and has a means for analyzing light on one side thereof. A means for diffusing light is disposed between the cell and the analyzing means. This arrangement results in a higher contrast ratio for the display than for the prior art arrangement having the analyzing means disposed between the cell and the diffusing means.
Inventors
- 👤 Richard W. Nosker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133504
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
41 words
A display comprising means for changing the polarization of light having first and second opposing sides; first means for analyzing light disposed adjacent to said first side; and means for diffusing light disposed between said first side and said analyzing means.
Claim 2
Dependent Claim
41 words
A display comprising means for changing the polarization of light having first and second opposing sides; first means for analyzing light disposed adjacent to said first side; and means for diffusing light disposed between said first side and said analyzing means.
Claim 3
Dependent Claim
19 words
The display of claim 1 further comprising means for illuminating said polarization changing means disposed adjacent said second side.
Claim 4
Dependent Claim
27 words
The display of claim 2 wherein said illuminating means comprises a light source, and means for polarizing light disposed between said light source and said second side.
Claim 5
Dependent Claim
17 words
The display of claim 3 wherein said light source comprises a lamp and a reflector adjacent thereto.
Claim 6
Dependent Claim
21 words
The display of claim 4 wherein said light source further comprises a Fresnel lens disposed at the aperature of said reflector.
Claim 7
Dependent Claim
12 words
The display of claim 4 wherein said lamp comprises a line source.
Claim 8
Dependent Claim
12 words
The display of claim 4 wherein said reflector comprises a parabolic reflector.
Claim 9
Dependent Claim
13 words
The display of claim 3 wherein said polarizing means comprises a sheet polarizer.
Claim 10
Dependent Claim
13 words
The display of claim 2 wherein said illumination means comprises a Fresnel lens.
Claim 11
Dependent Claim
15 words
The display of claim 1, wherein said polarization changing means comprises a liquid crystal cell.
Claim 12
Dependent Claim
14 words
The display of claim 10 wherein said cell comprises twisted nematic liquid crystal material.
Claim 13
Dependent Claim
14 words
The display of claim 1 wherein said diffusing means comprises a first lenticular array.
Claim 14
Dependent Claim
20 words
The display of claim 12 wherein said diffusing means further comprises a second lenticular array disposed adjacent said first array.
Claim 15
Dependent Claim
13 words
The display of claim 1 wherein said analyzing means comprises a sheet polarizer.
Claim 16
Dependent Claim
22 words
The display of claim 1 further comprising a second means for analyzing light disposed between said first side and said diffusing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |