Projector optical system having field lens changing optical angle of illuminated light
US8894212B2 · kind B2 · utility
1Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2011 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Jun 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/317
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector optical system is provided, the system including an illumination unit including illumination lenses illuminating light downwards, a display device receiving light illuminated from the illumination lenses to enable to realize an image, projection lenses downwardly projecting light emitted from the display device to a screen, and a field lens changing an optical angle of the light illuminated from the illumination lenses and emitting the light to the display device, and changing an optical angle by receiving an image light of the display device and emitting the light to the projection lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.