Normally white mode twisted nematic liquid crystal display device having improved viewing angle characteristics
US6208396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1997 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Oct 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/66
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A normally white mode twisted nematic liquid crystal display devices having significantly improved viewing angle characteristics of display contrast and gray scale inversion comprising an about 90.degree. twisted nematic liquid crystal cell and a first and a second light polarizing film separately disposed on two sides of said liquid crystal cell, a first and a second optical compensation layer which each comprises at least one optical compensation layer and has almost no refractive index anisotropy in-plane of the optical compensation layer A and has a characteristic wherein a refractive index in the thickness direction of the optical compensation layer A is lower than that in-plane of the optical compensation layer A, and a first and second optical compensation layer B, which each comprises at least one optical compensation layer and has optically positive refractive index anisotropy and has a characteristic wherein a principal optic axis of the optical compensation layer B is tilted 20 to 70.degree. from the normal direction of the optical compensation layer B, wherein said liquid crystal cell, said light polarizing films and said optical compensation layers A and B are laminate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.