Liquid crystal display device with compensation for viewing angle dependency and optical anisotropic element used therein
US6411355B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1996 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Aug 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a liquid crystal display device having a driving liquid crystal cell interposed between two polarizers 1 and 4, the cell having a liquid crystal layer 3e held between two substrates 3a and 3b, the layer having a twisted molecular alignment when no voltage is applied, and the liquid crystal cell performing optical control, using the optical anisotropy of liquid crystal, there is provided with an optical anisotropic element 2 between the polarizer and the driving liquid crystal cell, the optical anisotropic element 2 comprising an optical anisotropic substance layer 2c in which the optical rotatory power is minimal in the direction of layer thickness and the optical anisotropy is negative. The angle of the optical axis of the optical anisotropic element 2 varies continuously or in stages in the direction of layer thickness of the optical anisotropic element as against the surface of the optical anisotropic element. Furthermore, optical anisotropic element with negative optical anisotropy can be combine to the anisotropically negative element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.