LCD with a pair of retardation films on one side of normally white liquid crystal layer
US5594568A · kind A · utility
33Cited by
42References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1994 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Apr 29, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A normally white twisted nematic liquid crystal display is disclosed having a pair of retardation films disposed between the liquid crystal layer and an adjacent polarizer, both retardation films being on one side of the liquid crystal layer. Both retardation films, if uniaxial, have retardation values of from about 100-200 nm. Optionally, biaxial retarders (n.sub.X >n.sub.Y >n.sub.Z) may be used, such biaxial retarders having retardation values from about .DELTA..sub.ZX =-100 to -200 nm, and .DELTA..sub.ZY =-10 to -100 nm. Accordingly, inversion is reduced and contrast rations are improved at large viewing angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.