US4033672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal devices
Assignee: TIM SpA
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Filing: 1975-09-18
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Granted: 1977-07-05
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Expires: 1995-09-18
Abstract
Abstract This invention relates to liquid crystal display devices. One aspect of the invention concerns the electrolytic growing of projections on one plate of the device so that the projections register with the tin-oxide segment array on the other plate; another aspect concerns utilizing similar projections as internally placed spacers. An insulative sheet is deposited over the segment array in order to filter D.C. components, according to a third aspect of the invention, and, according to a fourth aspect, a spacing technique is disclosed which utilizes alumina particles in a glass matrix as an edge spacer. Further, a light concentration technique, utilizing a one-way mirror and a prism or fiber optic assembly, is disclosed.
Inventors
- 👤 Claudio Dalmasso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133524; G02F1/1339; G02F1/13392
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A liquid crystal display arrangement having a light transmissive liquid crystal display device having a front surface and a rear surface and further including: means disposed opposite said rear surface for redirecting ambient light rays from a first direction to a second direction passing from the rear surface toward the front surface, which is opposite an observer, to illuminate said front surface from the rear surface; and a one-way mirror disposed between said redirecting means and said rear surface and positioned to pass therethrough redirected light from said redirecting means traveling in said second direction and wherein said mirror is spaced apart from said rear surface to receive ambient light to additionally reflect same into said rear surface to further illuminate said front surface.
Claim 2
Dependent Claim
124 words
A liquid crystal display arrangement having a light transmissive liquid crystal display device having a front surface and a rear surface and further including: means disposed opposite said rear surface for redirecting ambient light rays from a first direction to a second direction passing from the rear surface toward the front surface, which is opposite an observer, to illuminate said front surface from the rear surface; and a one-way mirror disposed between said redirecting means and said rear surface and positioned to pass therethrough redirected light from said redirecting means traveling in said second direction and wherein said mirror is spaced apart from said rear surface to receive ambient light to additionally reflect same into said rear surface to further illuminate said front surface.
Claim 3
Dependent Claim
13 words
An arrangement according to claim 1 wherein said redirecting means is a prism.
Claim 4
Dependent Claim
15 words
An arrangement according to claim 1 wherein said redirecting means is an optical fiber arrangement.
Claim 5
Dependent Claim
28 words
An arrangement according to claim 1, wherein said first direction is substantially parallel to said front surface and said second direction is substantially perpendicular to said front surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |