Back-lit displays with high illumination uniformity
US7478913B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2006 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Jul 9, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133507
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A directly illuminated display unit has a display panel and one or more light sources disposed behind the display panel. A diffuser is disposed between the light source unit and the display panel and a light diverting layer is disposed between the one or more light sources and the diffuser. The light diverting layer has light diverting members on a first side of the light diverting layer facing the diffuser. Surfaces of the light diverting members are disposed at more than one angle relative to a normal to the light diverting layer and also include one or more sharp changes of surface slope. The light diverting members spread the illumination light so as to be more uniform. Different light diverting members can have different apex angles. Also, different sides of a light diverting member can have best fit centers of curvature that are non-coincident.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.