Illumination apparatus and projection display apparatus
US7845802B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2007 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Mar 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination apparatus includes a plate-like separation optical element having a dichroic surface and a PBS surface. The dichroic surface reflects green component light and transmits yellow component light. The PBS surface transmits P polarization component light and reflects S polarization component light. The separation optical element combines red component light entering from a certain direction and transmitted through the dichroic surface, with yellow component light entering from a different direction and reflected by the PBS surface, and leads a combined light towards a red liquid crystal panel. The separation optical element combines green component light entering from the certain direction and reflected by the dichroic surface, with yellow component light entering from the different direction and transmitted through the PBS surface, and leads a combined light towards a green liquid crystal panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.