Projector using guest-host liquid crystal cells for improved color purity
US4838655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Jan 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133533
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The disclosure relates to a projector having an arrangement of polarizers and liquid crystal cells aligned on the axis of light in the order a first color polarizer colored in red, a first twisted nematic liquid crystal cell, a second twisted nematic liquid crystal cell, a second color polarizer colored in a green, a third twisted nematic liquid, a neutral polarizer and Guest-Host type colored in blue. Since, according to this, a polarizer having inferior color characteristics can be replaced by a Guest-Host type liquid crystal cell, the excitation purity and the scope of color reproduction are improved. Further, since the mixture of color is additive, the brightness of the reproduced color is also much improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.