Patent ID: 6310371
Filing Date: 2001-10-30
Classification: G06K

Abstract:
A fingerprint sensor chip formed on a semiconductor wafer, the semiconductor wafer comprising a first dielectric layer, the fingerprint sensor chip comprising:a plurality of rectangular sensor areas arranged in a matrix format on the semiconductor wafer, each of the sensor areas being surrounded by electric conductors;a second dielectric layer covered on the sensor areas and the conductors, the surface of the second dielectric layer positioned above each of the sensor areas being formed as a protruding rectangular platform with a shallow trench surrounding the platform, the shallow trench being positioned above the conductors around the sensor area;a rectangular metal plate positioned on the top end of each of the rectangular platforms which is used as a sensor plate of the fingerprint sensor chip; anda protective layer positioned on the surface of the semiconductor wafer for covering and protecting each of the metal plates and the second dielectric layer.