Liquid crystal device including an alignment grating with...

Details Liquid crystal device including an alignment grating with... Liquid crystal device including an alignment grating with...

2011-02-08

2011-02-08

Caley, Michael H (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S124000, C349S130000, C349S160000

Reexamination Certificate

active

07884905

ABSTRACT:
This invention relates to a liquid crystal device wherein the surface profile of a surface alignment grating stabilizes at least one stable state. The invention involves the introduction or breaks (34, 36, 38) or discontinuities into the grating (10) to divide the grating into a plurality of groove segments. The breaks are discontinuities in the grating in the groove direction, the grating having substantially the same groove direction on each side of the break. The introduction of breaks prevent free movement of defects along the groove of the grating and therefore help to stabilize the desired liquid crystal configuration, either a Defect state or a Continuous state. Suitable breaks involve gaps (34) in the groove ridges (30), necks (36) between the groove ridges (30) and slips or relative displacement (38) of the grating.

REFERENCES:
patent: 4370194 (1983-01-01), Shaver et al.
patent: 5438421 (1995-08-01), Kano et al.
patent: 6249332 (2001-06-01), Brown et al.
patent: 6665041 (2003-12-01), Liao et al.
patent: WO 9918474 (1999-04-01), None
patent: 02/08825 (2002-01-01), None
International Search Report of PCT/GB2004/000519, mailed Jul. 6, 2004.

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