Liquid crystal display device
US7176999B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Jun 26, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1393
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positive uniaxial film 14 with a retardation of Rp [nm] in an in-plane direction is provided between a vertical alignment mode liquid crystal cell 11 and a polarizing plate 12, and a negative uniaxial film 15 with a retardation of Rn [nm] in a thickness direction is provided between the liquid crystal cell 11 and a polarizing plate 13. Further, when a parameter α1 [nm] relative to Rp is: α1=135−0.7×Rtac; and a parameter β1 [nm] relative to Rn is: β1=Rlc−65−1.4×Rtac, where Rtac [nm] is a retardation in a thickness direction of the respective triacetyl cellulose films 12b and 13b of polarizing plates 12 and 13, the retardations Rp and Rn are set to be values greater than 90% but smaller than 110% with reference to the parameters α1 and β1, respectively. This makes it possible to surely provide a vertical alignment mode liquid crystal display device which can maintain a high contrast when viewed from an oblique direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.