Light-emitting device having grating for aligning light-emissive layer
US7250710B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2004 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | May 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/342
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light-emitting device includes a substrate, a light-emissive layer disposed over the substrate, and a grating for aligning the light-emissive layer. The grating aligns molecules of the emissive layer, so that the device emits polarised. The grating also reduces wave guiding effects in the device, so increasing the useful light output of the device. The light-emitting device may be an organic light-emitting device (OLED). The grating may align substantially the entire area of the light-emissive layer in a first direction. In this case, substantially the entire emissive area of the device will emit layer of a single polarisation. Alternatively, the grating may align a first region of the light-emissive layer in a first direction and may align a second region of the light-emissive layer in a second direction different from the first direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.