Projection image display apparatus
US5826959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1997 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | May 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide a simple image projection apparatus which prevents color shading. First, second and third dichroic mirrors are provided in parallel which separate light from a source into red, blue, and green components. First and second polarization beam splitters are provided with operative surfaces perpendicular to the dichroic mirrors for reflecting predetermined polarization light components of two colors to two reflection type liquid crystal devices. A third polarization beam splitter having an operative surface in parallel to the dichroic mirrors is provided for reflecting a predetermined polarized light component of the third color component to a third reflection type liquid crystal device. A cross dichroic prism device is provided for combining the modulated light from the three liquid crystal devices and transmitting the synthesized light for projection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.