Wedge shaped light guide providing enhanced polarized light to a backlight liquid crystal display
US6124906A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0056
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention is intended to reduce the weight of the entire unit, make it compact and prevent the emitted light from being in dark and bright stripes in a light guide unit for a back light of a liquid crystal display device. Further, this invention allows a prism sheet having a larger apex angle to be used. To this end, the light guide unit comprises a plurality of light guide films laminated on the light guide member. The sloped surface which is opposite to the incident surface of the light guide unit is formed with grooves each having an inclination of an angle related to Brewster angle. A prism sheet is further disposed with the side having apexes oriented to the light guide unit to deflect the light emitted from the light guide unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.