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US4913530A
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Liquid crystal display
Assignee: JNC Corp
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Filing: 1988-11-10
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Granted: 1990-04-03
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Expires: 2008-11-10
Abstract
Abstract A liquid crystal display comprising two substrates and a nematic liquid crystal present between said two substrates, wherein each of said substrates comprises a glass plate, an electrode thereon and an aligning layer subjected to a molecular aligning treatment for a pretilt angle of 1° to 30° on the electrode, wherein an optically active material is added to the nematic crystal which has a positive dielectric anisotropy, wherein the average alignment direction in the longer direction of said liquid crystal molecule is twisted at an angle φ of 210° to 300° to impart a spiral structure to the liquid crystal and a ratio d/p of the spiral pitch p of the liquid crystal molecule and the liquid crystal thickness d are (φ/360-1/4)<d/p<φ/360; an improvement being present in that the nematic liquid crystal contains one or more compounds represented by the following formula (I) in an amount of not less than 10% by weight: ##STR1## wherein n 1 and n 2 are each respectively a natural number of not more than 10.
Inventors
- 👤 Yukiko Ichimura
- 👤 Shuichi Kozaki
- 👤 Fumiaki Funada
- 👤 Hideo Saito
- 👤 Kenji Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
176 words
A liquid crystal display comprising two substrates and a positive dielectric anisotropy nematic liquid crystal present between said two substrates, wherein each of said substrates comprises a glass plate, an electrode thereon and an aligning layer subjected to a molecular aligning treatment for a pretilt angle of 1° to 30° on the electrode, wherin an optically active material is added to said nematic crystal, and wherein the average alignment direction in the longer direction of said liquid crystal molecule is twisted at an angle φ of 210° to 300° to impart a spiral structure to said liquid crystal and a ratio d/p of the spiral pitch p of said liquid crystal molecule and the liquid crystal thickness d are (φ/360-1/4)<d/p<φ/360; wherein said nematic liquid crystal further contains one or more compounds represented by the following formula (I) in a total amount of not less than 10% by weight based on the total amount of the nematic liquid crystal: ##STR70## wherein n 1 and n 2 are each respectively a natural number of not more than 10.
Claim 2
Dependent Claim
176 words
A liquid crystal display comprising two substrates and a positive dielectric anisotropy nematic liquid crystal present between said two substrates, wherein each of said substrates comprises a glass plate, an electrode thereon and an aligning layer subjected to a molecular aligning treatment for a pretilt angle of 1° to 30° on the electrode, wherin an optically active material is added to said nematic crystal, and wherein the average alignment direction in the longer direction of said liquid crystal molecule is twisted at an angle φ of 210° to 300° to impart a spiral structure to said liquid crystal and a ratio d/p of the spiral pitch p of said liquid crystal molecule and the liquid crystal thickness d are (φ/360-1/4)<d/p<φ/360; wherein said nematic liquid crystal further contains one or more compounds represented by the following formula (I) in a total amount of not less than 10% by weight based on the total amount of the nematic liquid crystal: ##STR70## wherein n 1 and n 2 are each respectively a natural number of not more than 10.
Claim 3
Dependent Claim
69 words
The liquid crystal display according to claim 1, wherein said nematic liquid crystal contains, in addition to the compound (I), one or more compounds represented by the following formula (II) in a total amount of not less than 10% by weight based on the total amount of the nematic liquid crystal: ##STR71## wherein n 3 and n 4 are each respectively a natural number of not more than 10.
Claim 4
Dependent Claim
72 words
The liquid crystal display according to claim 1, wherein said nematic liquid crystal contains, in addition to the compound (I), one or more compounds represented by the following formula (III) in a total amount of not less than 5% by weight based on the total amount of the nematic liquid crystal: ##STR72## wherein n 5 , n 6 and n 7 are each respectively a natural number of not more than 10.
Claim 5
Dependent Claim
72 words
The liquid crystal display according to claim 2, wherein said nematic liquid crystal contains, in addition to the compound (I), one or more compounds represented by the following formula (III) in a total amount of not less than 5% by weight based on the total amount of the nematic liquid crystal: ##STR73## wherein n 5 , n 6 and n 7 are each respectively a natural number of not more than 10.
Claim 6
Dependent Claim
25 words
The liquid crystal display according to claim 1, wherein the total amount of the compounds of formula (I) is from 10% to 40% by weight.
Claim 7
Dependent Claim
25 words
The liquid crystal display according to claim 1, wherein the total amount of the compounds of formula (I) is from 10% to 20% by weight.
Claim 8
Dependent Claim
25 words
The liquid crystal display according to claim 2, wherein the total amount of the compounds of formula (I) is from 10% to 40% by weight.
Claim 9
Dependent Claim
25 words
The liquid crystal display according to claim 2, wherein the total amount of the compounds of formula (I) is from 10% to 20% by weight.
Claim 10
Dependent Claim
25 words
The liquid crystal display according to claim 3, wherein the total amount of the compounds of formula (I) is from 10% to 40% by weight.
Claim 11
Dependent Claim
25 words
The liquid crystal display according to claim 3, wherein the total amount of the compounds of formula (I) is from 10% to 20% by weight.
Claim 12
Dependent Claim
25 words
The liquid crystal display according to claim 4, wherein the total amount of the compounds of formula (I) is from 10% to 40% by weight.
Claim 13
Dependent Claim
25 words
The liquid crystal display according to claim 4, wherein the total amount of the compounds of formula (I) is from 10% to 20% by weight.
Claim 14
Dependent Claim
25 words
The liquid crystal display according to claim 2, wherein the total amount of the compounds of formula (II) is from 10% to 30% by weight.
Claim 15
Dependent Claim
25 words
The liquid crystal display according to claim 3, wherein the total amount of the compounds of formula (III) is from 5% to 15% by weight.
Claim 16
Dependent Claim
25 words
The liquid crystal display according to claim 4, wherein the total amount of the compounds of formula (II) is from 10% to 30% by weight.
Claim 17
Dependent Claim
25 words
The liquid crystal display according to claim 15, wherein the total amount of the compounds of formula (III) is from 5% to 15% by weight.
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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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |