Optical sheet and light emitting apparatus
US9203054B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2014 |
| Grant date | Dec 1, 2015 |
| Priority date | — |
| Expiry date | Dec 4, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K59/879
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical sheet includes a light scattering layer that scatters at least a part of light incident thereon by diffraction and that includes first and second areas. Each first area is a projection. Each second area is a recess. Each of at least the projections or the recesses has a tapered shape. When a center wavelength of the light incident on the light scattering layer is λ and a refractive index of a layer that is in contact with the light scattering layer at a light emission side is n, spatial frequency components of a pattern formed by the first and second areas have a maximum peak at a spatial frequency in a range of 0.068/(λ×n) or more and 2.8/(λ×n) or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.