Importance

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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.

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First Claim