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    • 6. 发明授权
    • Capacitive circuit array for fingerprint sensing
    • 用于指纹感测的电容电路阵列
    • US06429666B1
    • 2002-08-06
    • US09550626
    • 2000-04-17
    • Gregory S. Um
    • Gregory S. Um
    • G01R2708
    • G01R27/2605
    • A compact sensor which maps fingerprints for identification purposes. The sensor consists of an array of pixels with each pixel configured with one or more pickup conductive electrodes surrounded by voltage electrodes of different phases. This configuration performs capacitive differencing to eliminate the large background capacitance without the need for complex sensor circuitry. In addition, the readout lines are electrically shielded from the input voltage lines by an intermediate grounded conductive layer, thereby eliminating the parasitic capacitance and allowing the detection of minute capacitance variation of the finger surface.
    • 一种紧凑型传感器,用于识别目的的指纹。 传感器由像素阵列组成,每个像素配置有一个或多个由不同相位的电压电极围绕的拾音器导电电极。 该配置执行电容差分以消除大的背景电容,而不需要复杂的传感器电路。 此外,读出线通过中间接地导电层与输入电压线电屏蔽,从而消除寄生电容并允许检测手指表面的微小电容变化。