Light control systems with a circular polarizer and a twisted nematic liquid crystal having a minimum path difference of .lambda./2
US5319478A · kind A · utility
196Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jun 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133543
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A new mode of operation is proposed for light control systems consisting of a combination of liquid crystal cells and polarizers. The direct operation of liquid crystal cells with circularly-polarized light is advantageous in many respects. The circularly-polarized light is produced either with conventional circular polarizers or with monomeric or polymeric cholesteric liquid crystals. The new mode of operation is possible under certain conditions for all liquid crystal cells which hitherto had to be operated with linearly-polarized light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.