System and method for improving contrast in an electro-optical imaging system
US6536903B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 2001 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | May 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An off-axis projection system includes a polarizer, a reflective light modulator, an analyzer, and an aberration compensation element. The polarizer polarizes an illumination beam to form a polarized illumination beam. The reflective light modulator receives the polarized illumination beam along a first optical path, modulates the polarized illumination beam to form an imaging beam, and reflects the imaging beam along a second optical path not parallel to the first optical path. The aberration compensation element is disposed in either or both of the polarized illumination beam and the imaging beam. The separation of the illumination beam and the imaging beam provided by the off-axis architecture facilitates the use single-pass aberration compensation elements, including liquid crystal compensation films and wave retarders. A multi-color projection system is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.