Liquid crystal display using circular polarized light and light emitting screen
US6104456A · kind A · utility
4Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 19, 1998 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Oct 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133543
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display makes use of circularly polarised activation light; to this end it comprises a liquid crystal cell (7) acting as a half-wave plate so as to reverse the handedness of incident light in one setting and not to affect the handedness in another, and a filter (9) such as a cholesteric mirror for passing only that part of the light from the liquid crystal that has a predetermined handedness. When the light is passed by the filter (9), it strikes a photoluminescent screen (12), causing it to emit visible light for the display. The nematic cell is easy to produce and to switch, and the display does not need polarisers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.