Projection-type display apparatus
US7066609B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2003 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Oct 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a projection-type display apparatus that directs light from a light source through the illumination optical system to a display panel so that an image displayed on the display panel illuminated by the light directed thereto is projected through a projection optical system onto a screen, an illumination optical system is used that has a light intensity uniformizing device of which the entrance surface is located at a first conjugate position substantially conjugate with the light source and of which the exit surface has a shape geometrically similar to the panel surface of the display panel and a reflection optical system for forming an image of the exit surface of the light intensity uniformizing device on the panel surface of the display panel. In the reflection optical system, every surface having an optical power is a reflective surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.