公开(公告)号：US20010028426A1

公开(公告)日：2001-10-11

申请号：US09740260

申请日：2000-12-20

Applicant: The Secretary of State for Defence

Inventor： Guy Peter Bryan-Brown ,  Carl Vernon Brown ,  John Clifford Jones

IPC: G02F001/1337

CPC classification number: G02F1/13378 ,  G02F1/139 ,  G02F1/1391 ,  G02F1/1392 ,  G02F1/1396 ,  G02F2001/133765

Abstract: A bistable nematic liquid crystal device cell is provided with a surface alignment grating on at least one cell wall and a surface treatment on the other wall. Such treatment may be a homeotropic alignment or a planar alignment with or without an alignment direction, and zero or a non zero pretilt. The surface profile on the monograting is asymmetric with its groove height to width selected to give approximately equal energy within the nematic material in its two allowed alignment arrangements. The monograting may be formed by a photolithographic process or by embossing of a plastics material. The cell is switched by dc pulses coupling to a flexoelectric coefficient in the material, or by use of a two frequency addressing scheme and a suitable two frequency material. Polarisers either side of the cell distinguish between the two switched states. The cell walls may be rigid or flexible, and are coated with electrode structures, e.g. in row and column format giving an x,y matrix of addressable pixels on the cell.

Abstract translation: 双稳向列型液晶器件单元在至少一个单元壁上设置有表面对准光栅并在另一个壁上具有表面处理。 这种处理可以是垂直排列或具有或不具有取向方向的平面对准，以及零或非零预倾斜。 在单一研磨中的表面轮廓是不对称的，其槽高度被选择为在其两个允许的对准装置中在向列型材料内产生大致相等的能量。 单晶化可以通过光刻工艺或通过塑料材料的压花形成。 电池通过耦合到材料中的柔性电系数的直流脉冲或通过使用双频寻址方案和合适的两频率材料来切换。 电极的两侧的极化器区分两个切换状态。 细胞壁可以是刚性的或柔性的，并且涂覆有电极结构，例如， 以行和列格式给出单元格上的可寻址像素的x，y矩阵。