US3981816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device
Assignee: Panasonic Holdings Corp
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Filing: 1975-09-15
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Granted: 1976-09-21
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Expires: 1995-09-15
Abstract
Abstract In a liquid crystal display device comprising two glass substrate plates positioned in parallel with each other at a nearly constant interval and a liquid crystal interposed between said glass substrate plates, an electrode being provided on each of the opposite surfaces of said glass substrate plates and a voltage being applied between said electrodes, "haze" which appears at the display surface can be removed by using a liquid crystal composition containing one or more additives capable of controlling the orientation of the liquid crystal molecules (namely, capable of forming a perpendicular orientation phase).
Inventors
- 👤 Akio Moriyama
- 👤 Masakazu Fukai
- 👤 Komei Asai
- 👤 Koshiro Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:23
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345; G02F1/1337; G02F1/133703; C09K2019/3422
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A liquid crystal display device employing a nematic liquid crystal composition containing at least one homeotropic aligning additive having the following general formula: ##EQU1## wherein R is an alkyl group having 10 - 24 carbon atoms.
Claim 2
Dependent Claim
36 words
A liquid crystal display device employing a nematic liquid crystal composition containing at least one homeotropic aligning additive having the following general formula: ##EQU1## wherein R is an alkyl group having 10 - 24 carbon atoms.
Claim 3
Dependent Claim
77 words
The liquid crystal display device of claim 1, wherein the nematic liquid crystal composition containing at least one of said additives is interposed between two glass substrate plates, the inner opposite surfaces of said plates being at least partially provided with transparent thin film metal or metal oxide electrodes with the remaining portions of said opposite surfaces not so provided with said electrodes being subjected to chemical treatment or being provided with electrically insulating vacuum evaporated film.
Claim 4
Dependent Claim
26 words
A liquid crystal display device according to claim 1, wherein as the nematic liquid crystal, an equal weight mixture of p-anisylidene-p-n-heptylaniline, p-ethoxybenzylidene-p-n-butylaniline and p-n-propoxybenzylidene-p-n-pentylaniline is used.
Claim 5
Dependent Claim
48 words
A liquid crystal display device according to claim 2, wherein the electrically insulating vacuum evaporated film is selected from magnesium fluoride, silicon oxide, aluminum oxide, barium oxide, berylium oxide, bismuth oxide, magnesium oxide, nickel oxide, antimony oxide, tellurium oxide, thorium oxide, zinc oxide, indium oxide and tin oxide.
References Cited (Backward Citations)
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |