Polarization optical system and projection-type liquid-crystal display device
US8345190B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2008 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jul 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polarization optical system includes a first polarization plate, arranged at the light incident side of a liquid-crystal light valve, for transmitting first polarized light (s-polarized light) included in light incident on the liquid-crystal light valve from an illumination optical system and a second polarization plate, arranged at the light exit side of the liquid-crystal light valve, for transmitting second polarized light (p-polarized light), different from the first polarized light (s-polarized light), included in imaging light emitted from the liquid-crystal light valve to a projection optical system, in which the second polarization plate is configured in such a way that its light-incident face is concave toward the liquid-crystal light valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.