EP0350383A2
Expired / Lapsed
EP
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Twisted nematic liquid crystal display device
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1989-07-03
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Granted: —
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Expires: 2009-07-03
Abstract
Abstract A twisted nematic liquid crystal display device compensated for the anisotropy of the twisted nematic liquid crystal layer when oriented perpendicular to the substrate under an application of electric field by anisotropy compensating means comprising a uniaxial anisotropic film having an optically negative activity in the direction perpendicular to the substrate. This optically negative activity is so selected to compensate the positive optical anisotropy of the nematic liquid crystal when oriented perpendicular to the substrate in the presence of an electric field.
Inventors
- 👤 Tatsuo Uchida
- 👤 Kazuo Ariga
- 👤 Seiyu Kuniyasu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133634; G02F1/137; G02F1/139; G02F1/1396; G02F2413/00; G02F2413/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A twisted nematic liquid crystal display device comprising: a twisted nematic liquid crystal cell including a pair of parallel substrates provided with electrodes and a nematic liquid crystal layer sandwiched between the pair of substrates, the liquid crystal molecules being twisted gradually from one substrate to the other substrate according to the orientation on the substrates by 80-100 degrees, in the absence of electric field and being oriented substantially orthogonal to the substrate when a voltage is applied between the electrodes, thereby exhibiting a positive optical anisotropy; a pair of crossed polarizers sandwiching the twisted nematic liquid crystal cell and having polarization axes mutually crossing orthogonally; anisotropy compensating means disposed between the liquid crystal cell and at least one of the polarizers, including uniform uniaxial film having a negative optical anisotropy in the direction of the thickness which compensates the positive optical anisotropy of the liquid crystal layer, when the liquid crystal molecules are oriented normal to the substrate under the application of an electric field.
Claim 2
Dependent Claim
166 words
A twisted nematic liquid crystal display device comprising: a twisted nematic liquid crystal cell including a pair of parallel substrates provided with electrodes and a nematic liquid crystal layer sandwiched between the pair of substrates, the liquid crystal molecules being twisted gradually from one substrate to the other substrate according to the orientation on the substrates by 80-100 degrees, in the absence of electric field and being oriented substantially orthogonal to the substrate when a voltage is applied between the electrodes, thereby exhibiting a positive optical anisotropy; a pair of crossed polarizers sandwiching the twisted nematic liquid crystal cell and having polarization axes mutually crossing orthogonally; anisotropy compensating means disposed between the liquid crystal cell and at least one of the polarizers, including uniform uniaxial film having a negative optical anisotropy in the direction of the thickness which compensates the positive optical anisotropy of the liquid crystal layer, when the liquid crystal molecules are oriented normal to the substrate under the application of an electric field.
Claim 3
Dependent Claim
20 words
A twisted nematic liquid crystal display device according to claim 1, wherein said anisotropy compensating means comprises hot-pressed polymer sheet.
References Cited (Backward Citations)
No citation records indexed.
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