Touch sensitive liquid crystal switch

Details Touch sensitive liquid crystal switch Touch sensitive liquid crystal switch

Filed on

1982-11-10

Date issued

1985-07-16

Examiner

Groody, James J.

Patent Class

Communications: electrical

SubClass

Audible indication

SubSubClass

Percussion-type sound producer

Other Related Categories

200DIG1, 340712, 340784, 340765, G06F 302, G09G 318

Type

Patent

Status

active

Patent number

045299684

Description

ABSTRACT:
A touch sensitive switch with a liquid crystal cell and a circuit for measuring capacitive changes when the cell is deformed by touch. The cell has 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 cells extra sensitivity is achieved by maintaining a voltage across the cell between a critical and saturation value.

REFERENCES:
patent: 3482241 (1969-12-01), Johnson
patent: 3815127 (1974-06-01), Blumke
patent: 4224615 (1980-09-01), Penz
patent: 4290061 (1981-09-01), Serrano
patent: 4313108 (1982-01-01), Yoshida

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