Surface pressure input panel

Details Surface pressure input panel Surface pressure input panel

1994-10-07

1996-04-02

Chilcot, Richard

Measuring and testing

Dynamometers

Responsive to multiple loads or load components

73862041, G06K 900

Patent

active

055030297

ABSTRACT:
An active matrix surface pressure input panel comprises a flexible pressure sheet stacked onto a circuit base plate. The pressure sheet includes a conductive layer and the circuit base plate comprises an insulating plate with first and second groups of intersecting electrode lines and a multiplicity of detection elements formed thereon. Each detection element includes a contact plate coupled to the electrode lines by a switch, such as a thin film transistor or diode, and configured to generate an electrical signal when the overlying portion of the conductive layer contacts the contact plate. The electrode lines are coupled to an electrical circuit that determines the relative location of each electrical signal to map an overall surface pressure distribution. With this configuration, the surface pressure input panel exhibits high definition over a relatively large detection area so that complicated surfaces, such as fingerprints, can be accurately detected and reproduced.

REFERENCES:
patent: 4014217 (1977-03-01), Lagasse et al.
patent: 4547898 (1985-10-01), Tsikos
patent: 4577345 (1986-03-01), Abramov
patent: 4640137 (1987-02-01), Trull et al.
patent: 5010774 (1991-04-01), Kikuo et al.
patent: 5055838 (1991-10-01), Wise et al.
patent: 5060527 (1991-10-01), Burgess
patent: 5083467 (1992-01-01), Tabota
patent: 5225959 (1993-07-01), Stearns

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