Illumination system using polarization conversion
US7387388B2 · kind B2 · utility
7Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2005 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Jun 20, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method is discloses for providing a substantially uniform, homogenous, polarized light. A beam of substantially un-polarized light is provided by a conventional light source. The un-polarized light is converted to at least four real images by using a light pipe and appropriate lensing. Each of the real images have a light region and one more dark regions at a first image plane. A portion of light from a light region in each real image is directed to one or more dark regions in each of the real images in a polarization dependent manner and the altered image is into a single image of substantially polarized light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.