LED-illumination-type DMD projector and optical system thereof
US6644814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Dec 19, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A DMD projector of small size, lightweight and long life, which employs LED arrays as a light source for brighter screen. According to the projector, projection light from sets of a LED array, a first fly-eye lens appressed thereto, and a second fly-eye lens disposed at a distance therefrom, which are prepared for red, green and blue, enters into three entrance planes of a XDP, and a synthesized light of red, green and blue is projected from the exit plane of the XDP to illuminate a DMD panel. At this point, rays reflected from on-pixels of the DMD panel makes images on a screen via a projection lens using an optical system in which extended images of the same number as the elements of the LED arrays, the images being obtained through exit pupils of respective element lenses of the first fly-eye lenses, the corresponding element lenses of the second fly-eye lenses, and the subsequent illumination lenses, are focused and superposed on the DMD panel. In addition, the projector projects images in color by synchronizing on/off signals of red, green and blue with on/off signals of the pixels on the DMD panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.