Optical components and light emitting devices comprising asymmetric scattering domains
US8033674B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2010 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Aug 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/07
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a polarization-sensitive light homogenizer and a backlight and display using the same. The homogenizer improves the spatial luminance and color uniformity, increases the luminance in a direction normal to the homogenizer and provides increased luminance through polarized light recycling within the light homogenizer and backlight. In one embodiment, the homogenizer includes a polarization-sensitive anisotropic light-scattering (PDALS) region, a non-polarization-sensitive anisotropic light-scattering region, and a substantially non-scattering region. In a further embodiment, the non-scattering region is birefringent. The spatially non-uniform incident light flux from a backlight including one or more non-extended light emitting sources is scattered efficiently by the NPDASL region and is incident on the PDALS region which backscatters light orthogonal to the polarization state desired for efficient illumination of a liquid crystal display panel. The NPDASL and the PDALS form a multiple reflection cavity that will increase the spatial luminance while improving the light recycling of the appropriate polarization state. In a further embodiment the light ho…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.