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Patent US5291322A successfully refreshed from Google Patents.
US5291322A
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Supertwisted, nematic liquid crystal display device with LC birefringence at least 0.2 and LC retardation at least 1 micrometer
Assignee: Panasonic Liquid Crystal Display Co Ltd
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Filing: 1992-03-25
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Granted: 1994-03-01
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Expires: 2012-03-25
Abstract
Abstract A liquid crystal display device is disclosed, which comprises a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to the first substrate, and a nematic liquid crystal layer disposed between the first substrate and the second substrate; a first polarizer disposed outside of the first substrate; a second polarizer disposed outside of the second substrate; and at least one optically anisotropic layer disposed at least one of between the first substrate and the first polarizer and between the second substrate and the second polarizer. The twist angle of the nematic liquid crystal layer is greater than 180°; and the following conditions are fulfilled: ##EQU1## where Δn LC represents a birefringence of the nematic liquid crystal; d LC a thickness of the nematic liquid crystal layer; Δn i a birefringence of the optically anisotropic layer; d i a thickness of the optically anisotropic layer; and m a number of optically anisotropic layers.
Inventors
- 👤 Osamu Itoh
- 👤 Katsumi Kondo
- 👤 Jun-ichi Hirakata
- 👤 Naoki Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/02
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
162 words
A liquid crystal display device comprising: a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to the first substrate, and a nematic liquid crystal layer disposed between said first substrate and said second substrate; a first polarizer disposed outside of said first substrate; a second polarizer disposed outside of said second substrate; and at least one optically anisotropic layer disposed at least one of between said first substrate and said first polarizer and between said second substrate and said second polarizer; wherein a twist angle of said nematic liquid crystal layer is greater than 180°; and the following conditions are fulfilled: ##EQU9## where Δn LC represents a birefringence of said nematic liquid crystal; d LC a thickness of said nematic liquid crystal layer; Δn i a birefringence of said optically anisotropic layer; d i a thickness of said optically anisotropic layer; and m a number of optically anisotropic layers.
Claim 2
Dependent Claim
162 words
A liquid crystal display device comprising: a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to the first substrate, and a nematic liquid crystal layer disposed between said first substrate and said second substrate; a first polarizer disposed outside of said first substrate; a second polarizer disposed outside of said second substrate; and at least one optically anisotropic layer disposed at least one of between said first substrate and said first polarizer and between said second substrate and said second polarizer; wherein a twist angle of said nematic liquid crystal layer is greater than 180°; and the following conditions are fulfilled: ##EQU9## where Δn LC represents a birefringence of said nematic liquid crystal; d LC a thickness of said nematic liquid crystal layer; Δn i a birefringence of said optically anisotropic layer; d i a thickness of said optically anisotropic layer; and m a number of optically anisotropic layers.
Claim 3
Dependent Claim
27 words
A liquid crystal display device according to claim 1, wherein said twist angle of said nematic liquid crystal layer is in a region between 180° and 300°.
Claim 4
Dependent Claim
20 words
A liquid crystal display device according to claim 1, wherein a condition (Δn LC .d LC )≦2.5 μm, is fulfilled.
Claim 5
Dependent Claim
17 words
A liquid crystal display device according to claim 1, wherein a condition Δn LC ≦0.3 is fulfilled.
Claim 6
Dependent Claim
35 words
A liquid crystal display device according to claim 1, wherein said first substrate has a third electrode, said second substrate has a fourth electrode, and said first, second, third and fourth electrodes form a matrix.
Claim 7
Dependent Claim
48 words
A liquid crystal display device according to claim 1, wherein an absorbing axis of said first polarizer and an absorbing axis of said second polarizer form an angle between 60° and 90°, viewed in a direction of a normal to surfaces of said first and said second substrates.
Claim 8
Dependent Claim
47 words
A liquid crystal display device according to claim 1, wherein a fast axis of said optically anisotropic layer forms an angle between 60° and 90° with an alignment direction of the one of said first and said second substrates, to which said optically anisotropic layer is closet.
Claim 9
Dependent Claim
49 words
A liquid crystal display device according to claim 1, wherein absorbing layers are disposed at a part where said first electrode does not exist on a surface of said first substrate and at a part where said second electrode does not exist on a surface of said second substrate.
Claim 10
Dependent Claim
17 words
A liquid crystal display device according to claim 1, wherein said nematic liquid crystal layer contains torans.
Claim 11
Dependent Claim
49 words
A liquid crystal display device according to claim 1, wherein in a case where said liquid crystal cell is normally open, a pointer is displayed in a dark state and in a case where said liquid crystal cell is normally closed, said pointer is displayed in a bright state.
Claim 12
Dependent Claim
226 words
A liquid crystal display device comprising: a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to said first substrate, and a nematic liquid crystal layer disposed between said first substrate and said second substrate; a first polarizer disposed outside of said first substrate; a second polarizer disposed outside of said second substrate; and at least one optically anisotropic layer disposed at least one of between said first substrate and said first polarizer and between said second substrate and said second polarizer; wherein said liquid crystal display device has characteristics that, in the case where a first driving voltage V 1 , which is higher than a threshold voltage which is a driving voltage, in the neighborhood of which alignment of a molecular axis of said nematic liquid crystal varies sharply, is applied between said first electrode and said second electrode, transmittance of said liquid crystal display device is smaller than 2% and in the case where a second driving voltage V 2 , which is higher than said threshold voltage, is applied between said first electrode and said second electrode, transmittance of said liquid crystal display device is greater than 12%, where said first driving voltage V 1 and said second driving voltage V 2 have a relationship 0.87≦(V 1 /V 2 )≦1.15.
Claim 13
Dependent Claim
226 words
A liquid crystal display device comprising: a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to said first substrate, and a nematic liquid crystal layer disposed between said first substrate and said second substrate; a first polarizer disposed outside of said first substrate; a second polarizer disposed outside of said second substrate; and at least one optically anisotropic layer disposed at least one of between said first substrate and said first polarizer and between said second substrate and said second polarizer; wherein said liquid crystal display device has characteristics that, in the case where a first driving voltage V 1 , which is higher than a threshold voltage which is a driving voltage, in the neighborhood of which alignment of a molecular axis of said nematic liquid crystal varies sharply, is applied between said first electrode and said second electrode, transmittance of said liquid crystal display device is smaller than 2% and in the case where a second driving voltage V 2 , which is higher than said threshold voltage, is applied between said first electrode and said second electrode, transmittance of said liquid crystal display device is greater than 12%, where said first driving voltage V 1 and said second driving voltage V 2 have a relationship 0.87≦(V 1 /V 2 )≦1.15.
Claim 14
Dependent Claim
42 words
A liquid crystal display device according to claim 11, wherein in displaying a pointer on the liquid crystal display device, the minimum value of the driving voltage applied between said first electrode and said second electrode is higher than said threshold voltage.
Claim 15
Dependent Claim
129 words
A liquid crystal display device according to claim 11, wherein it is characterized in that, denoting values of Stokes' parameters of a polarized state of transmitted light when said first driving voltage V 1 is applied thereto by (S 1 , S 2 , S 3 ) and values of Stokes' parameters of the polarized state of said transmitted light when said second driving voltage V 2 is applied thereto by (S 1 ', S 2 ', S 3 '), in the case where the polarized state of said transmitted light immediately before the light is injected into the polarizer located on the ejection side is expressed by Stokes' parameters, the parameters fulfill a condition 0.5≦0.5 (1-S 1 S 1 '-S 2 S 2 '-S 3 S 3 ').
Claim 16
Dependent Claim
46 words
A liquid crystal display device according to claim 11, further comprising means for applying said first driving voltage V 1 between said first electrode and said second electrode and means for applying said second driving voltage V 2 between said first electrode and said second electrode.
Claim 17
Dependent Claim
77 words
A liquid crystal display device according to claim 14, wherein a twist angle of said nematic liquid crystal layer is greater than 180°; and the following conditions are fulfilled: ##EQU10## where Δn LC represents a birefringence of said nematic liquid crystal; d LC a thickness of said nematic liquid crystal layer; Δn i a birefringence of said optically anisotropic layer; d i a thickness of said optically anisotropic layer; and m a number of optically anisotropic layers.
Claim 18
Dependent Claim
27 words
A liquid crystal display device according to claim 15, wherein said twist angle of said nematic liquid crystal layer is in a region between 180° and 300°.
Claim 19
Dependent Claim
20 words
A liquid crystal display device according to claim 15, wherein a condition (Δn LC .d LC )≦2.5 μm is fulfilled.
Claim 20
Dependent Claim
16 words
A liquid crystal display device according to claim 15, wherein a following condition is fulfilled: ##EQU11##
Claim 21
Dependent Claim
17 words
A liquid crystal display device according to claim 15, wherein a condition Δn LC ≦0.3 is fulfilled.
Claim 22
Dependent Claim
35 words
A liquid crystal display device according to claim 15, wherein said first substrate has a third electrode, said second substrate has a fourth electrode, and said first, second, third and fourth electrodes form a matrix.
Claim 23
Dependent Claim
48 words
A liquid crystal display device according to claim 15, wherein an absorbing axis of said first polarizer and an absorbing axis of said second polarizer form an angle between 60° and 90°, viewed in a direction of a normal to surfaces of said first and said second substrates.
Claim 24
Dependent Claim
48 words
A liquid crystal display device according to claim 15, wherein a fast axis of said optically anisotropic layer forms an angle between 60° and 90° with an alignment direction of the one of said first and or said second substrates, to which said optically anisotropic layer is closet.
Claim 25
Dependent Claim
47 words
A liquid crystal display device according to claim 15, wherein absorbing layers are disposed at a part where said first electrode doesn't exist on a surface of said first substrate and at a part where said second electrode doesn't exist on a surface of said second substrate.
Claim 26
Dependent Claim
17 words
A liquid crystal display device according to claim 15, wherein said nematic liquid crystal layer contains torans.
Claim 27
Dependent Claim
49 words
A liquid crystal display device according to claim 15, wherein in a case where said liquid crystal cell is normally open, a pointer is displayed in a dark state and in a case where said liquid crystal cell is normally closed, said pointer is displayed in a bright state.
Claim 28
Dependent Claim
77 words
A liquid crystal display device according to claim 14, wherein a twist angle of said nematic liquid crystal layer is greater than 180°; and the following conditions are fulfilled: ##EQU12## where Δn LC represents a birefringence of said nematic liquid crystal; d LC a thickness of said nematic liquid crystal layer; Δn i a birefringence of said optically anisotropic layer; d i a thickness of said optically anisotropic layer; and m a number of optically anisotropic layers.
Claim 29
Dependent Claim
27 words
A liquid crystal display device according to claim 26, wherein said twist angle of said nematic liquid crystal layer is in a region between 180° and 300°.
Claim 30
Dependent Claim
20 words
A liquid crystal display device according to claim 26, wherein a condition (Δn LC .d LC )≦2.5 μm is fulfilled.
Claim 31
Dependent Claim
16 words
A liquid crystal display device according to claim 26, wherein a following condition is fulfilled: ##EQU13##
Claim 32
Dependent Claim
17 words
A liquid crystal display device according to claim 26, wherein a condition Δn LC ≦0.3 is fulfilled.
Claim 33
Dependent Claim
35 words
A liquid crystal display device according to claim 26, wherein said first substrate has a third electrode, said second substrate has a fourth electrode, and said first, second, third and fourth electrodes form a matrix.
Claim 34
Dependent Claim
48 words
A liquid crystal display device according to claim 26, wherein an absorbing axis of said first polarizer and an absorbing axis of said second polarizer form an angle between 60° and 90°, viewed in a direction of a normal to surfaces of said first and said second substrates.
Claim 35
Dependent Claim
48 words
A liquid crystal display device according to claim 26, wherein a fast axis of said optically anisotropic layer forms an angle between 60° and 90° with an alignment direction of the one of said first and or said second substrates, to which said optically anisotropic layer is closet.
Claim 36
Dependent Claim
49 words
A liquid crystal display device according to claim 26, wherein absorbing layers are disposed at a part where said first electrode does not exist on a surface of said first substrate and at a part where said second electrode does not exist on a surface of said second substrate.
Claim 37
Dependent Claim
17 words
A liquid crystal display device according to claim 26, wherein said nematic liquid crystal layer contains torans.
Claim 38
Dependent Claim
49 words
A liquid crystal display device according to claim 26, wherein in a case where said liquid crystal cell is normally open, a pointer is displayed in a dark state and in a case where said liquid crystal cell is normally closed, said pointer is displayed in a bright state.
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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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |