Touch sensitive switches

Details Touch sensitive switches Touch sensitive switches

G - Physics

08

B

340/124.2

G08B 1/08 (2006.01) H03K 17/96 (2006.01)

Patent

CA 1196985

ABSTRACT OF THE DISCLOSURE A touch sensitive switch comprises a liquid crystal cell and means for measuring capacitive changes when the cell is deformed by touch. The cell comprises a layer of a liquid crystal material between slides bearing electrodes, Capacitive changes are detected for example by a comparator or by a bridge circuit which includes one or more cells. Touching one cell unbalances the bridge. The area of cell that is touched may be coincident with or separate from a display area. For some types of cell extra sensitivity is achieved by maintaining a voltage across the cell between a critical and saturation value.

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