Multi-domain liquid-crystal display device
US5936692A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1998 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Jun 2, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2019/3095
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a multi-domain liquid-crystal display device comprising two substantially parallel substrates which are provided with an electrode layer and an orientation layer. A layer of a nematically ordered liquid-crystalline material comprising a chiral dopant is sandwiched between the substrates. The layer is structured in such a manner that the pixels of the layer are composed of at least two types of sub-pixels in which the twist senses of the liquid-crystalline material are mutually opposite. This construction in accordance with the invention is achieved by differentiating the composition of the chiral dopant in the different types of sub-pixels. This is attained by employing isomerizable chiral dopants and/or diffusion techniques in combination with local exposure of the liquid-crystal layer. The invention also provides methods of manufacturing such multi-domain liquid-crystal display devices. The multi-domain liquid-crystal display devices in accordance with the invention are easier to manufacture than display devices in which the orientation layers must be structured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.