Scanning backlight for flat-panel display
US8581831B2 · kind B2 · utility
98Cited by
8References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2011 |
| Grant date | Nov 12, 2013 |
| Priority date | — |
| Expiry date | Oct 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0233
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illuminator for a flat-panel display comprises a tapered slab waveguide 1 co-extensive with the display, a light source 2-4 arranged to inject light into an edge of the waveguide so that it emerges over the face of the waveguide, and means for scanning the light injected into the wedge so that different areas of the panel are illuminated in turn. Preferably the light source is a set of rows of LEDs, each row injecting light at a different range of angles so that it emerges over different areas of the waveguide 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.