Projection display
US7267446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | Sep 11, 2007 |
| Priority date | — |
| Expiry date | Dec 1, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/315
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection display includes first through third light source units to radiate first through third light beams, respectively, having different colors, an X-cube prism to combine paths of the first through third light beams, an optical modulator to sequentially modulate the first through third light beams according to image information, and a projection lens unit to magnify and project the modulated light beams onto a screen. Each of the first through third light source units includes at least one optical module. The optical module includes a collimator having a first reflective surface in a parabolic shape, and a compact light source located in the vicinity of a focal point of the first reflective surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.