Laser projection source with polarization diversity element for speckle reduction
US8287128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2009 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Jan 29, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging system (200), such as a scanned laser projection system, includes one or more laser sources (201) configured to produce one or more light beams (204), and a light modulator (203) configured to produce images (206) from the light beams (204). A polarization diversity element (221), which can be manufactured from a birefringent material or from a polymerized liquid crystal layer, is disposed within the imaging system (200). The polarization diversity element (221) is configured to alter the polarization of an incident beam to create a transmitted beam comprising diverse polarization patterns, thereby reducing speckle in projected images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.