Alignment film, a method for producing the alignment film and a liquid crystal display device using the alignment film
US5786041A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133711
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An alignment-film in which the pretilt angle is changed by ultraviolet irradiation, a material for forming the same, a liquid crystal display device using the alignment film, a method for producing an alignment-film formation material, and a method for producing an alignment film. Ultraviolet irradiation causes large changes in pretilt angle but few changes in electrical characteristics, and a liquid crystal display device free from deterioration of the liquid crystal, image sticking, or the occurrence of flicker results. A first polymer forms the underlying principal layer and a second polymer forms thereon a surface layer thinner than the principal layer. The first polymer may exhibit a small change in electrical characteristics due to ultraviolet radiation and the second polymer may exhibit a large change in pretilt angle due to ultraviolet radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.