Dispersing and polarizing light filter
US7354164B2 · kind B2 · utility
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Key dates
| Filing date | Apr 18, 2005 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Sep 27, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical filter includes an array of light-transmissive beads in a matrix of opaque binder that surrounds one portion of the beads to provide light entrances and exit apertures for incident light to pass substantially only through the beads. A polarizing layer is disposed between the apertures and the viewing surface of the filter for improved rejection of ambient light. The polarizing layer transmits linearly polarized image light aligned with the polarization axis while attenuating randomly or orthogonally polarized ambient light, resulting in improved image contrast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.