Lightguides having light extraction structures providing regional control of light output
US8322874B2 · kind B2 · utility
7Cited by
54References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 2, 2008 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Jul 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Lightguides, devices incorporating lightguides, and processes for making lightguides are described. A lightguide includes light extractors arranged in a pattern on a surface of the lightguide. The pattern of light extractors is arranged to enhance uniformity of light output across a surface of the lightguide and to provide enhanced defect hiding. The efficiency of the light extractors is controlled by a shape factor. The areal density of the light extractors across the surface of the lightguide may be substantially constant or may decrease along the direction of propagation of light from the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.