Liquid crystal rotator
US4114990A · kind A · utility
38Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | May 4, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13787
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cholesteric filled liquid crystal cell has one surface homeotropically aligned and the opposite surface homogeneous parallel aligned. Plane polarized light incident upon the homogeneous parallel aligned surface with its polarization plane parallel with or orthogonal to the alignment direction has its plane of polarisation rotated by an amount controllable by the application of an electric potential across the cell. This forms the active element of a simulated rotating pointer meter display having no moving parts and only a single pair of electrical inputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.