Normally white twisted nematic LCD with retardation films on opposite sides of liquid crystal material for improved viewing zone
US5570214A · kind A · utility
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43References
48Claims
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Key dates
| Filing date | Dec 15, 1993 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Dec 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A normally white twisted birefringent liquid crystal display having first and second retardation films having retardation values of about 80-200 nm on opposite sides of a liquid crystal layer for the purpose of expanding the viewing angles of the display. Also, the viewing zone of this normally white display can be shifted vertically by rotating the optical axes of the retardation films so as to position the viewing zone away from an inversion area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.