Polarization separation element, a polarization conversion system, an optical element, and a projection display system
US6621533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Oct 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/285
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a polarization separation element comprising a first array of prisms having a wedge-shaped cross-section, and a second array of prisms also having a wedge-shaped cross section. One of the prism arrays is an array of birefringent prisms.The present invention also provides a polarization conversion system having a polarization separation element of the above type for directing light having a first polarization in a first direction and for directing light having a second polarization different from the first polarization in a second direction different from the first direction; and one or more polarization conversion elements for converting light having the first and second polarizations to light having a substantially common output polarization. The polarization conversion system of the invention is suitable for use in a projection display system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.