Method and apparatus for improving the viewing angle of an LCD screen by twisting the polarizers and compensating structures
US6642980B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2000 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Oct 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133634
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display device with a liquid crystal cell including a layer of twisted nematic liquid crystal placed between two polarizers and including, between the liquid crystal layer and each of the polarizers, a structure for compensating for cell contrast variations according to the observation angle which has an orientation in the plane of the cell. The pass directions of the polarizers are separated by an angle of 90+A degrees, in which A is not zero, and the orientations of the two compensation structures are separated by an angle of 90+B degrees, in which B is not zero. Such a structure may find particular application to a liquid crystal screen, especially for avionics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.