Multi-domain liquid-crystal display device

Details Multi-domain liquid-crystal display device Multi-domain liquid-crystal display device

1998-06-02

1999-08-10

Dang, Hung Xuan

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 88, 349179, 349187, G02F 11337

Patent

active

059366923

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.

REFERENCES:
patent: 5204763 (1993-04-01), Hokmet
patent: 5262882 (1993-11-01), Hokmet
patent: 5623354 (1997-04-01), Lien et al.
patent: 5757455 (1998-05-01), Sugiyama et al.
patent: 5831700 (1998-11-01), Li et al.

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