Capacitive touch-pad devices with dynamic bias

Details Capacitive touch-pad devices with dynamic bias Capacitive touch-pad devices with dynamic bias

1977-05-23

1979-01-23

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307360, 361280, 361330, H03K 326, H03K 5153, H01G 504

Patent

active

041362918

ABSTRACT:
A dynamic biasing capacitance is formed between a transmitting electrode and a receiving electrode of a capacitive touch-pad device to couple a portion of the scan voltage signal into the sense node of a voltage comparator circuit, coupled to the receiving electrode, to offset the comparator circuit threshold voltage. The dynamic biasing capacitance may be formed by overlapping portions of the electrodes, with a dielectric layer positioned therebetween, or by the parasitic capacitance between aligned end surfaces of the two electrodes, with the magnitude of the dynamic biasing capacitance being adjusted by variation of interelectrode geometries.

REFERENCES:
patent: 3826979 (1974-07-01), Steinmann
patent: 3986110 (1976-10-01), Overall et al.
patent: 4016490 (1977-04-01), Weckenmann et al.

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