Projection-display apparatus and method providing improved brightness of projected color image
US5798819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods and apparatus are disclose for obtaining a bright projected color image. In a representative apparatus, polarized beam splitters (one for each primary color of an image to be projected) separate p-polarized light and s-polarized light for each of the primary colors. Each separated s- and p-polarized light for each color enters a respective spatial light modulator. For each primary color, modulated light fluxes produced by the two spatial light modulators, which perform modulation of the same image, are analyzed and integrated by the polarized beam splitters. The analyzed and integrated light fluxes for each primary color are color integrated, either by projection using separate projection lenses for each color, or by a cross-dichroic prism followed by projection using a single lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.