Optical projection engine device having a polarizing beam splitter and a control providing modulation instructions to modulation imagers
US8134109B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2009 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Oct 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/365
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical projection engine device uses a symmetrical wire grid polarizing beam splitter (PBS) that splits incident illumination to a symmetrical pair of polarized light beams in two orthogonal polarization states, one by reflection and the other by transmission, for illuminating a pair of reflective modulation imagers respectively. In identical geometric configuration, the two synchronized reflective modulation imagers polarization modulate polarized light beams as received, and reflect them back towards the PBS, which through transmission and reflection respectively, combines and projects two modulated light beams through a projection lens system to form a pair of spatially overlapped illumination images of aligned pixels with the same image in two orthogonal polarization states on a projection screen. The device jointly provides improvement optical efficiency and expanded function to three dimensional stereoscopic displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.