公开(公告)号：US20180204036A1

公开(公告)日：2018-07-19

申请号：US15406109

申请日：2017-01-13

Applicant: SYNAPTICS INCORPORATED

Inventor： Arash AKHAVAN FOMANI ,  Kirk HARGREAVES ,  Patrick SMITH

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/047

Abstract: Embodiments herein describe an input device that includes a rectangular array of sensor electrodes connected to sensor modules that measure capacitive sensing signals corresponding to the electrodes. During a charge stage, the input device applies a charging voltage to neighboring sensor electrodes in the array. The input device then drives the neighboring sensor electrodes to a reference voltage and measures the amount of charge accumulated on at least one of the sensor electrodes. Because of the parasitic capacitance between the neighboring electrodes, driving these electrodes (even the ones not being measured) to the same charging and reference voltages reduces the effect of the parasitic capacitance on the capacitive sensing measurement. Thus, during the read stage, the measured charge is affected primarily by the capacitance between the sensor electrodes and an input object (e.g., a finger).

公开(公告)号：US20170006223A1

公开(公告)日：2017-01-05

申请号：US14788390

申请日：2015-06-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Kirk HARGREAVES ,  Patrick SMITH ,  Joseph Kurth REYNOLDS ,  Stephen L. MOREIN

IPC: H04N5/232 ,  H04N5/225 ,  G06K9/00

CPC classification number: G06K9/38 ,  G06K9/00067

Abstract: This disclosure generally provides a fingerprint sensor that derives a fingerprint by measuring capacitive sensing signals while modulating a reference voltage rail used to power the fingerprint sensor. In one embodiment, the fingerprint sensor is integrated into an electronic device which may include other components such as a display, I/O devices, speakers, and the like. To power these components, the electronic device may include a DC power supply which outputs reference voltages. When transmitting the reference voltages to the fingerprint sensor, the electronic device may modulate the voltages using a modulating signal. Because the reference voltages are used to power the components in the fingerprint sensor, modulating the rail voltages also causes the components coupled to the reference voltages to also modulate. While this modulation occurs, the fingerprint sensor measures resulting signals using a plurality of sensor electrodes which are then processed to derive a fingerprint.

Abstract translation: 本公开通常提供一种指纹传感器，其通过测量电容性感测信号而导出指纹，同时调制用于为指纹传感器供电的参考电压轨。 在一个实施例中，指纹传感器被集成到电子设备中，其可以包括诸如显示器，I / O设备，扬声器等的其他组件。 为了对这些组件供电，电子设备可以包括输出参考电压的直流电源。 当将参考电压传送到指纹传感器时，电子设备可以使用调制信号来调制电压。 由于参考电压用于为指纹传感器中的组件供电，所以调制轨道电压也会使耦合参考电压的组件也进行调制。 当这种调制发生时，指纹传感器使用多个传感器电极来测量所得到的信号，然后处理它们以导出指纹。