Backlighting system including a specular partial reflector and a circular-mode reflective polarizer
US8427599B2 · kind B2 · utility
3Cited by
19References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2008 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Sep 21, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49002
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a display backlight (120, 220, 420) a specular partial reflector (250, 450) is placed between a circular-mode reflective polarizer (242, 442) and an illumination device (230, 430). The specular partial reflector (450) recycles otherwise unused polarized light (468L) reflected from the circular-mode reflective polarizer (442) which results in an optimized backlight brightness. The main application of the backlight (120) is in liquid crystal displays (100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.