Patent ID: 9322862
Filing Date: 2016-04-26
CPC Classification: G01R,G06F,H01L,H03K

Claim Text:
1. A fingerprint capacitive sensing array device with high sensitivity, comprising: sensing electrodes separately arranged in an array, wherein each of the sensing electrodes and an object form a sensing capacitor; a shielding conductor layer disposed below the sensing electrodes; a constant voltage source providing a constant voltage to the shielding conductor layer so that a vertical parasitic capacitor is formed between the shielding conductor layer and each of the sensing electrodes; and switch modules each electrically connected to the constant voltage source via a corresponding one of the sensing electrodes, when one of the sensing electrodes is selected to perform sensing, the switch module corresponding to the selected sensing electrode is configured as an open-circuited state such that the selected sensing electrode is disconnected from the constant voltage source, while the other sensing electrodes are electrically connected to the constant voltage source via the other corresponding switch modules configured as short-circuited states, so that a horizontal parasitic capacitor is formed between the selected sensing electrode and the other sensing electrodes, wherein the sensing electrodes, and the shielding conductor layer are on the same side of a package substrate.