Liquid crystal display device with birefringence compensator and volume hologram
US7176998B2 · kind B2 · utility
0Cited by
22References
20Claims
0Family size
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Key dates
| Filing date | Aug 14, 2001 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Sep 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133632
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display device comprising a liquid-crystal cell element (20) placed between two polarizers (23, 28) comprising at least one optical structure for compensating for the variations in birefringence of said liquid crystal according to the viewing angle. The optical compensation structure comprises at least one oblique-axis film (25, 26) of polymerized liquid-crystal type suitable for at least partly compensating for the undesirable effects of the natural birefringence of the liquid crystal, combined with a volume hologram (24, 27) of small retardation suitable for improving the compensatability of said film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.