Light-emitting apparatus and method for forming the same
US7122958B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2004 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | May 13, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24355
Abstract
In a bottom emission type light-emitting apparatus, a face of a substrate, which is opposite from a light-emitting device, is an uneven surface having a plurality of asperities. The mean spacing Sm of adjacent asperities or the mean spacing S of peaks of adjacent projections of the asperities is no less than three times the longest wavelength of light generated by the light-emitting layer and no more than two hundred times the longest wavelength. The arithmetic mean slope Δa of the uneven surface is in a range between 3° and 20°, inclusive. Therefore, the apparatus substantially has higher extraction efficiency and a higher brightness in a specific direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.