Optical compensation films based on stretched polymer films
US9011992B2 · kind B2 · utility
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33Claims
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Key dates
| Filing date | Aug 22, 2008 |
| Grant date | Apr 21, 2015 |
| Priority date | — |
| Expiry date | Nov 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3083
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides uniaxially stretched polymer films that have a refractive index profile suitable for use as negative A-plates or biaxial birefringent plates in a liquid crystal display (LCD) device. These wave plates can be used to compensate for the phase retardations existing in various modes of LCDs including TN (twisted nematic), VA (vertically aligned), IPS (in-plane switching), and OCB (optically compensated bend), and therefore improving the viewing quality of the displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.