US4973137A
Expired / Lapsed
US
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Liquid crystal display device with compensation layers
Assignee: Sharp Corp
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Filing: 1988-10-31
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Granted: 1990-11-27
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Expires: 2008-10-31
Abstract
Abstract A liquid crystal display device which comprises first and second electrode substrates spaced a predetermined distance from each other, a nematic liquid crystal layer added with an optically active material and having a positive dielectric anisotropy, which layer is sandwiched between the first and second electrode substrates such that the liquid crystal molecules exhibit a helical structure in which they are twisted in a predetermined twist angle in a direction across the thickness of the liquid crystal layer, a light detecting element positioned on one side of the first electrode substrate remote from the liquid crystal layer, a polarizing element positioned on one side of the second electrode substrate remote from the liquid crystal layer, and a film-like sheet having a birefringence and disposed between the light detecting element and the first electrode substrate, and/or between the polarizing element and the second electrode substrate.
Inventors
- 👤 Shyuichi Kozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397; C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; G02F1/1333; G02F1/1335; G02F1/13363; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/01; G02F2413/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
188 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a film-like sheet having a birefringence and disposed between the light detecting element and the first substrate, said film-like sheet exhibiting an anisotropic differential index of refractive Δn' and a layer thickness d', the value of Δn'·d' being 0.24 μm.
Claim 2
Dependent Claim
188 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a film-like sheet having a birefringence and disposed between the light detecting element and the first substrate, said film-like sheet exhibiting an anisotropic differential index of refractive Δn' and a layer thickness d', the value of Δn'·d' being 0.24 μm.
Claim 3
Dependent Claim
188 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a film-like sheet having a birefringence and disposed between the light detecting element and the second substrate, said film-like sheet exhibiting an anisotropic differential index of refraction Δn' and a layer thickness d', the value of Δn'·d' being 0.24 μm.
Claim 4
Dependent Claim
188 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a film-like sheet having a birefringence and disposed between the light detecting element and the second substrate, said film-like sheet exhibiting an anisotropic differential index of refraction Δn' and a layer thickness d', the value of Δn'·d' being 0.24 μm.
Claim 5
Dependent Claim
237 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a first film-like sheet having a birefringence and disposed between the light detecting element and the first substrate, said first film-like sheet exhibiting an anisotropic differential index of refractive Δn' and a layer thickness d', the value of Δn'·d' being within the range of 0.1 to 0.9 μm; a second film-like sheet having a birefringence and disposed between the light detecting element and the second substrate, said second film-like sheet exhibiting an anisotropic differential index of refraction Δn'and a layer thickness d', the value of Δn·d' being 0.24 μm.
Claim 6
Dependent Claim
237 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having an optically active material added thereto, said nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and a first film-like sheet having a birefringence and disposed between the light detecting element and the first substrate, said first film-like sheet exhibiting an anisotropic differential index of refractive Δn' and a layer thickness d', the value of Δn'·d' being within the range of 0.1 to 0.9 μm; a second film-like sheet having a birefringence and disposed between the light detecting element and the second substrate, said second film-like sheet exhibiting an anisotropic differential index of refraction Δn'and a layer thickness d', the value of Δn·d' being 0.24 μm.
Claim 7
Dependent Claim
26 words
The liquid crystal display device of claim 1, wherein said film-like sheet is selected from a group consisting of polyester, polyvinyl alcohol, polypropylene, nylon and acetate.
Claim 8
Dependent Claim
26 words
The liquid crystal display device of claim 2 wherein said film-like sheet is selected from a group consisting of polyester, polyvinyl alcohol, polypropylene, nylon and acetate.
Claim 9
Dependent Claim
26 words
The liquid crystal display device of claim 3 wherein said film-like sheet is selected from a group consisting of polyester, polyvinyl alcohol, polypropylene, nylon and acetate.
Claim 10
Dependent Claim
169 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and wavelength-dependent contrast variation compensation means for inhibiting the transmission of wavelength-dependent contrast variation, including a film-like sheet having a birefringence and disposed adjacent one of said substrates opposite said nematic liquid crystal layer.
Claim 11
Dependent Claim
169 words
A liquid crystal display device comprising: first and second substrates spaced a predetermined distance from each other and having electrodes formed thereon; a nematic liquid crystal layer having a positive dielectric anisotropy, said nematic liquid crystal layer being sandwiched between the first and second substrates such that the liquid crystal molecules thereof exhibit a helical structure in which they are twisted a predetermined twist angle in a direction across the thickness of the liquid crystal layer, said liquid crystal layer exhibiting an anisotropic differential index of refraction Δn and a layer thickness d, the value of Δn·d being 0.65 μm; a light detecting element positioned on one side of the first substrate remote from the liquid crystal layer; a polarizing element positioned on one side of the second substrate remote from the liquid crystal layer; and wavelength-dependent contrast variation compensation means for inhibiting the transmission of wavelength-dependent contrast variation, including a film-like sheet having a birefringence and disposed adjacent one of said substrates opposite said nematic liquid crystal layer.
Claim 12
Dependent Claim
32 words
The liquid crystal display device of claim 7 wherein said film-like sheet exhibits an anisotropic differential index of refraction Δn' and a layer thickness d', the value of Δn'·d' being 0.24 μm.
Claim 13
Dependent Claim
26 words
The liquid crystal display device of claim 8 wherein said film-like sheet is selected from a group consisting of polyester, polyvinyl alcohol, polypropylene, nylon and acetate.
Claim 14
Dependent Claim
19 words
The liquid crystal display device of claim 7 wherein said film-like sheet is disposed adjacent said light detecting element.
Claim 15
Dependent Claim
18 words
The liquid crystal display device of claim 7 wherein said film-like sheet is disposed adjacent said polarizing element.
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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) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |