Edge-lit back light unit with improved efficiency
US11668975B2 · kind B2 · utility
3Cited by
2References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2021 |
| Grant date | Jun 6, 2023 |
| Priority date | — |
| Expiry date | Dec 16, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133615
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An edge-lit back light unit for a backlit display includes a reflector, an edge-lit light guide film, a diffuser film, and a pair of crossed brightness enhancement films with increased efficiency. The diffuser film has an angular light distribution output that is matched to light acceptance angles of the pair of crossed brightness enhancement films to provide increased on-axis brightness without having to increase power to the edge-lit back light unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.