Smetic liquid crystal devices

Details Smetic liquid crystal devices Smetic liquid crystal devices

G - Physics

02

F

345/59

G02F 1/137 (2006.01) G02F 1/141 (2006.01)

Patent

CA 1281404

A B S T R A C T SMECTIC LIQUID CRYSTAL DEVICES A liquid crystal display (1, 20) is arranged to provide very low minimum light transmittion in one of its two switchable states. This makes it useful for a shutter (Figure 1) and for high contrast digital displays (Figure 2). A layer 14 of a chiral smectic liquid crystal material is contained between two cell walls (9, 10) carrying electrode structures (11, 12). The liquid crystal material has the following phases with temperature:- isotropic Image cholesteric Image chiral smectic Image solid. The cholesteric pitch is large. The cell walls are surface treated to provide a parallel alignment of liquid crystal molecules. Crossed polarisers (2, 3) are arranged either side of the cell walls, one (2) aligned with its optical axis parallel to the surface alignment of the adjacent cell wall (9). The device is switched (5, 5) by means of +/- d.c. voltage pulses and utilises the ferro electric effect.

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