Light guide device and backlight module therewith
US7661833B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 17, 2006 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Jan 29, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0056
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide device (52) includes a light guide substrate (520) and a sub-wavelength grating (527). The light guide substrate has a light input surface (521), a light output surface (522) adjacent to the light input surface (521), a bottom surface (523) opposite to the light output surface (522). In the light guide plate, stress-induced birefringence is introduced to achieve the polarization state conversion. The SWG 527 located on the light output surface includes a top layer (525) and a bottom layer (526). The SWG 527 is configured to work as a reflective polarizing beam splitter, consistent with the principle of rigorous coupled-wave theory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.