公开(公告)号：US11295105B2

公开(公告)日：2022-04-05

申请号：US16765295

申请日：2019-05-28

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Shengji Yang ,  Xue Dong ,  Xiaochuan Chen ,  Hui Wang ,  Pengcheng Lu ,  KuanTa Huang

IPC: G06K9/00 ,  G06F3/041

Abstract: An ultrasonic sensing circuitry is disclosed which includes an ultrasonic sensor circuit, an input circuit, a reset circuit, a storage circuit, a selection circuit, a source follower, and a compensation circuit. The ultrasonic sensor circuit generates a sensing voltage corresponding to a received ultrasonic signal to provide the sensing voltage to a first node. The input circuit provides the voltage of the first node to a second node. The reset circuit resets the voltage of the second node. The storage circuit stores a voltage difference between the second node and a second supply voltage terminal. The selection circuit provides a third supply voltage to a third node. The source follower outputs a current corresponding to a voltage between a first electrode and a control electrode via an output terminal. The compensation circuit provides a compensated sensing voltage to a control electrode of the source follower.