Patent US4733949A successfully refreshed from Google Patents.
US4733949A
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US
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Liquid crystal display device
Assignee: Hitachi Ltd
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Filing: 1985-12-12
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Granted: 1988-03-29
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Expires: 2005-12-12
Abstract
Abstract In a liquid crystal display device produced by forming an orientation controlling film on each surface of upper and lower substrates having an electrode, placing a liquid crystal composition between said substrates, and then sealing the periphery of the substrate, the response times, particularly those at low temperatures can be reduced by using, as the aforesaid liquid crystal composition, a liquid crystal composition which is obtained by adding a material having a glass transition temperature (Tg) of -90 DEG C. or lower to a liquid crystal material base and has a Tg of -82 DEG C. or lower.
Inventors
- 👤 Hidetoshi Abe
- 👤 Akio Mukoh
- 👤 Teruo Kitamura
- 👤 Norimasa Kamezawa
- 👤 Yasuo Hanawa
- 👤 Mikio Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
162 words
A liquid crystal display device comprising upper and lower substrates, each of said substrates having an electrode and an orientation controlling film formed on a surface thereof, a layer of liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition is a liquid crystal composition having a T g of -90° C. or lower, the liquid crystal composition including an organic compound having a T g of -90° C. or lower, added to a liquid crystal material base, the organic compound having a T g of -90° C. or lower being a liquid crystalline substance, said liquid crystalline substance acting to improve the response time of the liquid crystal composition, as compared to that of the liquid crystal material base, to thereby provide a response time of said liquid crystal display device that is 0.5 seconds or less at a temperatue as low as -30° C.
Claim 2
Dependent Claim
162 words
A liquid crystal display device comprising upper and lower substrates, each of said substrates having an electrode and an orientation controlling film formed on a surface thereof, a layer of liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition is a liquid crystal composition having a T g of -90° C. or lower, the liquid crystal composition including an organic compound having a T g of -90° C. or lower, added to a liquid crystal material base, the organic compound having a T g of -90° C. or lower being a liquid crystalline substance, said liquid crystalline substance acting to improve the response time of the liquid crystal composition, as compared to that of the liquid crystal material base, to thereby provide a response time of said liquid crystal display device that is 0.5 seconds or less at a temperatue as low as -30° C.
Claim 3
Dependent Claim
36 words
A device according to claim 1, wherein the aforesaid liquid crystalline substance to be added to the liquid crystal material base is selected from the group consisting of 4-butoxy-benzylidene-4'-butylaniline, 4-hexyloxy-benzylidene-4'-butylaniline, trans-4-methyl-4'-(propoxymethylenepyhenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(trans-propoxymethylenecyclohexane)benzene and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
Claim 4
Dependent Claim
30 words
A device according to claim 2, wherein the amount of the aforesaid liquid crystalline substance to be added to the liquid crystal material base is 10 to 50% by weight.
Claim 5
Dependent Claim
38 words
A device according to claim 1, wherein the T g of the organic compound having a T g of -90° C. or lower to be added to the liquid crystal material base is -90° C. to -150° C.
Claim 6
Dependent Claim
148 words
A liquid crystal display device comprising upper and lower substrates, each of said substrates having an electrode and an orientation controlling film formed on a surface thereof, a layer of liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition is a liquid crystal composition having a T g of -90° C. or lower, the aforesaid liquid crystal composition being prepared by adding an organic compound of a liquid crystalline substance having a T g of -90° C. or lower, which acts to improve the response time of the liquid crystal composition, as compared to a liquid crystal material base, to the liquid crystal material base to thereby provide a response time of said liquid crystal display device that is 0.5 seconds or less at a temperature as low as -30° C.
Claim 7
Dependent Claim
148 words
A liquid crystal display device comprising upper and lower substrates, each of said substrates having an electrode and an orientation controlling film formed on a surface thereof, a layer of liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition is a liquid crystal composition having a T g of -90° C. or lower, the aforesaid liquid crystal composition being prepared by adding an organic compound of a liquid crystalline substance having a T g of -90° C. or lower, which acts to improve the response time of the liquid crystal composition, as compared to a liquid crystal material base, to the liquid crystal material base to thereby provide a response time of said liquid crystal display device that is 0.5 seconds or less at a temperature as low as -30° C.
Claim 8
Dependent Claim
34 words
A device according to claim 5, wherein the liquid crystal material base comprises a mixture of liquid crystals to provide a wide mesomorphic range from a low temperature side to a high temperature side.
Claim 9
Dependent Claim
19 words
A device according to claim 6, wherein said mixture of liquid crystals comprises at least three liquid crystal components.
Claim 10
Dependent Claim
52 words
A device according to claim 7, wherein said at least three liquid crystal components are liquid crystal materials selected from the group consisting of cyclohexylcyclohexane series, phenylcyclohexane series, biphenyl series, terphenyl series, cyclohexylcyclohexane-carboxylate series, phenylcyclohexane-carboxylate series, phenyl benzoate series, biphenylcyclohexane-carboxylate series, phenylbiphenyl-carboxylate series, phenylbenzothioate series, benzylidene-aniline series phenylpyrimidine series and phenyldioxane series.
Claim 11
Dependent Claim
22 words
A device according to claim 5, wherein the liquid crystal material base comprises a mixture of at least three liquid crystal components.
Claim 12
Dependent Claim
52 words
A device according to claim 9, wherein said at least three liquid crystal components are liquid crystal materials selected from the group consisting of cyclohexylcyclohexane series, phenylcyclohexane series, biphenyl series, terphenyl series, cyclohexylcyclohexane-carboxylate series, phenylcyclohexane-carboxylate series, phenyl benzoate series, biphenylcyclohexane-carboxylate series, phenylbiphenyl-carboxylate series, phenylbenzothioate series, benzylidene-aniline series, phenylpyrimidine series and phenyldioxane series.
Claim 13
Dependent Claim
26 words
A device according to claim 1, wherein said liquid crystal composition has a wide mesomorphic range from a low temperature side to a high temperature side.
Claim 14
Dependent Claim
23 words
A device according to claim 1, wherein said liquid crystal composition has a wide mesomorphic range and includes a mixture of liquid crystals.
Claim 15
Dependent Claim
34 words
A device according to claim 1, wherein the aforesaid liquid crystalline substance to added to the liquid crystal material base is selected from the group consisting of trans-4-methyl-4'-(propoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(transpropoxymethylenecyclohexane benzene and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
Claim 16
Dependent Claim
34 words
A device according to claim 1, wherein the aforesaid liquid crystalline substance to be added to the liquid crystal material base is selected from the group consisting of trans-4-methyl-4'-(propoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(transpropoxymethylenecyclohexane)benzene and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
Claim 17
Dependent Claim
37 words
A device according to claim 5, wherein said liquid crystalline substance added to the liquid crystal material base is at least one substance selected from the group consisting of 4-butoxy-benzylidene-4'-butylaniline, 4-hexyloxy-benzylidene-4'-butylaniline, trans-4-methyl-4'-(propoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(trans-propoxymethylenecyclohexane)benzene, and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
Claim 18
Dependent Claim
149 words
A liquid crystal display device comprising upper and lower substrates, each of said substances having an electrode and an orientation controlling film formed on a surface thereof, a layer of a liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition contains a liquid crystal material base and an additive of an organic compound having a glass transition temperature (T g ) of -90° C. or lower, said additive being a liquid crystalline substance, said liquid crystal composition having a T g of -90° C. or lower, said additive acting to improve the response time of the liquid crystal composition, as compared to that of the liquid crystal material base, to provide a response time of the liquid crystal composition to be 0.5 seconds or less at temperatures as low as -30° C.
Claim 19
Dependent Claim
149 words
A liquid crystal display device comprising upper and lower substrates, each of said substances having an electrode and an orientation controlling film formed on a surface thereof, a layer of a liquid crystal composition interposed between said substrates, and a sealing means disposed at the periphery of said substrates, the improvement wherein the aforesaid liquid crystal composition contains a liquid crystal material base and an additive of an organic compound having a glass transition temperature (T g ) of -90° C. or lower, said additive being a liquid crystalline substance, said liquid crystal composition having a T g of -90° C. or lower, said additive acting to improve the response time of the liquid crystal composition, as compared to that of the liquid crystal material base, to provide a response time of the liquid crystal composition to be 0.5 seconds or less at temperatures as low as -30° C.
Claim 20
Dependent Claim
34 words
A device according to claim 16, wherein the liquid crystal material base comprises a mixture of liquid crystals to provide a wide mesomorphic range from a low temperature side to a high temperature side.
Claim 21
Dependent Claim
38 words
A device according to claim 16, wherein the T g of the organic compound having a T g of -90° C. or lower to be added to the liquid crystal material base is -90° C. to -150° C.
Claim 22
Dependent Claim
27 words
A device according to claim 1, the device being selected from the group consisting of twisted nematic display device, phase-change display device and guest-host color display device.
Claim 23
Dependent Claim
27 words
A device according to claim 16, the device being selected from the group consisting of twisted nematic display device, phase-change display device and guest-host color display device.
Claim 24
Dependent Claim
27 words
A device according to claim 5, the device being selected from the group consisting of twisted nematic display device, phase-change display device and guest-host color display device.
Claim 25
Dependent Claim
53 words
A device according to claim 1, wherein said liquid crystal material base is at least one liquid crystal material selected from the group consisting of cyclohexylcylohexane series, phenylcyclohexane series, biphenyl series, terphenyl series, cyclohexylcyclohexane-carboxylate series, phenylcyclohexane-carboxylate series, phenyl benzoate series, biphenylcyclohexane-carboxylate series, phenylbiphenyl-carboxylate series, phenylbenzothioate series, benzylidene-aniline series, phenylpyrimidine series and phenyl-dioxane series.
Claim 26
Dependent Claim
36 words
A device according to claim 19, wherein the aforesaid liquid crystalline substance to be added to the liquid crystal material base is selected from the group consisting of 4-butoxy-benzylidene-4'-butylaniline, 4-hexyloxy-benzylidene-4'-butylaniline, trans-4-methyl-4'-(propoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(trans-propoxymethyelencyclohexane)benzene and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
Claim 27
Dependent Claim
61 words
A device according to claim 23, wherein the liquid crystal material base is a mixture of liquid crystals selected from the group consisting of (1) trans-4-propyl(4'-ethoxyphenyl)cyclohexane, trans-4-propyl(4'-cyanophenyl)cyclohexane, trans-4-propyl(4'-butoxyphenyl)-cyclohexane, trans-4-pentyl(4'-cyanophenyl)cyclohexane, trans-4-pentyl(4'-ethylbiphenyl)cyclohexane and 4-(trans-4-pentylcyclohexyl)4'-trans-4-propylcyclohexylbiphenyl; (2) trans-4-propyl(4'-cyanophenyl)cyclohexane, trans-4-pentyl(4'-cyanophenyl)cyclohexane, trans-4-propyl(4'-pentoxy)-cyclohexane, trans-4-pentyl(4-ethylbiphenyl)cyclohexane, trans-4-pentyl(4'-cyanobiphenyl)cyclohexane and 4-pentyl-4'-cyanoterphenyl; (3) trans-4-propyl(4'-cyanophenyl)cyclohexane, trans-4-pentyl(4'-cyanophenyl)cyclohexane, trans-4-heptyl(4''-cyanophenyl)-cyclohexane and trans-4-pentyl-(4'-cyanobipyhenyl)cyclohexane; (4) 4-pentyl-4'-cyanobiphenyl, 4-heptyl-4'-cyanobiphenyl, 4-pentoxy-4'-cyanobiphenyl and 4-pentyl-4'-cyanoterphenyl; and (5) 4-pentyl-4'-cyanobiphenyl, 4-pentoxy-4'-cyanobiphenyl, 4-pentyl-(4'-cyanophenyl)pyrimidine, 4-heptyl(4'-cyanophenyl)pyrimidine, 4-butyl)4'-cyanobiphenyl)pyrimidine and 4-pentyl-4'-cyanoterphenyl.
Claim 28
Dependent Claim
35 words
A device according to claim 24, wherein the aforesaid liquid crystalline substance to be added to the liquid crystal material base is selected from a group consisting of trans-4-methyl-4'-(propoxymethylenephenyl)cyclohexane, trans-4-pentyl-4'-(butoxymethlenephenyl)cyclohexane, trans-4-pentyl-4'-(pentoxymethylenephenyl)cyclohexane, 4-pentyl-4'-(trans-propoxymethylenecyclohexane) benzene and trans-4-pentyl-4'-(methoxymethylenephenyl)cyclohexane.
References Cited (Backward Citations)
US29349A
Cited
US3675987A
Cited
US3951845A
Cited
US3910682A
Cited
US4011173A
Cited
DE2418703A1
Cited
USRE29349E
Cited
US4000084A
Cited
US4082686A
Cited
US4090975A
Cited
US4059340A
Cited
JPS5188485A
Cited
US4068923A
Cited
US4173544A
Cited
US4180475A
Cited
US4147656A
Cited
DE2636684A1
Cited
US4198130A
Cited
US4227778A
Cited
JPS5616582A
Cited
US4328116A
Cited
JPS5668636A
Cited
US4410445A
Cited
JPS5734176A
Cited
EP0058981A2
Cited
US4564694A
Cited
US4464283A
Cited
US4469618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |