Patent ID: 7127089
Filing Date: 2006-10-24
Classification: G06K

Abstract:
1. An electrostatic capacitance detection device that reads surface contours of a target object by detecting electrostatic capacitance which changes according to a distance from the target object, the device comprising: an M number of individual power-supply lines, and an N number of individual output lines arranged in a matrix of M rows and N columns; an electrostatic capacitance detecting element formed at the intersection between the individual power-supply lines and the individual output lines, the electrostatic capacitance detecting element including a signal detection element and a signal amplifying element, the signal detection element including a capacitance detecting electrode and a capacitance detecting dielectric layer, and the signal amplifying element including an MIS thin-film semiconductor device for signal amplification, including a gate electrode, a gate insulator, and a semiconductor layer; a source region of the MIS thin-film semiconductor device for signal amplification being connected to the individual output line; a drain region of the MIS thin-film semiconductor device for signal amplification being connected to the individual power-supply line; the gate electrode of the MIS thin-film semiconductor device for signal amplification being connected to the capacitance detecting electrode; an element capacitance C the transistor capacitance C where L (μm) is the gate electrode length, W (μm) is the sate electrode width of the MIS thin-film semiconductor device for signal amplification, t the element capacitance C where S (μm