Optical cellulose acylate film, polarizing plate and liquid crystal display
US7927672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2005 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Aug 16, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1393
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cellulose acylate film is provided and is excellent in increasability of an in-plane retardation and a retardation in a thickness direction, from which an additive does not bleed out, and which is excellent in surface properties. The cellulose acylate film has a thickness of 40 μm to 180 μm and contains no retardation increasing agent. Retardation values Re and Rth of the cellulose acylate film meet the following formulae (III) to (V):46≦Re≦100 (III)Rth=a−5.9Re (IV)520≦a≦670 (V)A polarizing plate and a VA mode liquid crystal display having wide viewing angle characteristics and small changes in color, which are using the cellulose acylate film, are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.