Liquid crystal display with multi-domains
US5623354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1994 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Feb 10, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133788
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display with an array of pixels comprises a liquid crystal layer having transparent electrodes on either side thereof with an alignment layer disposed on each of the electrodes and in contact with opposite surfaces of the liquid crystal layer. The alignment layers are capable of inducing a predetermined pre-tilt angle on the molecules of the liquid crystal. The pre-tilt angle inducing ability of at least one of the alignment layers, which is formed with only one alignment direction, has been selectively altered so that pre-tilt angle inducing ability in the altered area differs in the magnitude of the angle from the pre-tilt angle inducing ability of the unaltered area. With the liquid crystal molecules having at least two different pre-tilt angles, more than one domain is created when voltage is applied across the electrodes. The change in the pre-tilt angle inducing ability in the altered areas is achieved by exposure to a beam, such as ultra violet light, of sufficient energy. In the preferred embodiment, the display is an active type with twisted nematic liquid crystals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.