Optical compensatory sheet comprising a biaxially stretched cellulose acetate film, polarizing plate and liquid crystal display
US7084944B2 · kind B2 · utility
15Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 2001 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Jun 2, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical compensatory sheet comprises a cellulose acetate film. The film contains 100 weight parts of cellulose acetate having an acetic acid content of 59.0 to 61.5% and 0.01 to 20 weight parts of an aromatic compound having at least two aromatic rings. The cellulose acetate film has an Re retardation value measured at 550 nm (Re550) in the range of 0 to 200 nm and an Rth retardation value measured at 550 nm (Rth550) in the range of 70 to 400 nm. The cellulose acetate film further has a thickness in the range of 10 to 70 μm. The optical compensatory sheet is used in a liquid crystal display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.