Polarizing plate and liquid crystal display apparatus using the same
US7704570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2006 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Feb 25, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/031
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polarizing plate includes two transparent supports A and B; and a polarizer sandwiched between the two transparent supports A and B; wherein (i) the transparent support A is a stretched cellulose ester film (a) which contains a non-phosphoric acid ester plasticizer and substantially does not contain a phosphoric acid ester plasticizer, and wherein (ii) the transparent support B is a stretched cellulose ester film (b) which has a retardation value R0 of from 0 nm to 10 nm and a retardation value Rt of from −30 nm to 20 nm, and the retardation value R0 and the retardation value Rt are defined by the following formulas (I) and (II):Ro=(nx−ny)×d Formula (I):Rt={(nx+ny)/2−nz}×d. Formula (II):
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.