System and method for total light extraction from flat-panel light-emitting devices
US7535171B2 · kind B2 · utility
19Cited by
7References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2007 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Jun 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2211/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system and method for improving light extraction from luminescent devices such as light-emitting flat-panel displays (for example, light-emitting diode (OLED) flat-panel displays) or flat panel lamps. The system includes a material with negative index of refraction, preferably with n=−1. The presence of such material on the exit surface of the electro-optic devices such as flat panel display or lamp with light-generating medium sandwiched between materials with refractive index n>1 fully removes TIR and results in light outcoupling efficiency of about 100%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.