公开(公告)号：US09886142B2

公开(公告)日：2018-02-06

申请号：US14095007

申请日：2013-12-03

Applicant: PIXART IMAGING INC.

Inventor： Kei-Tee Tiew

IPC: G06F3/045 ,  G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416

Abstract: There is provided a capacitive touch sensing system including a touch panel, a plurality of amplification units, an analog signal processing unit and an AD converter. The touch panel includes a plurality of driving electrodes intersecting with a plurality of sensing electrodes. Each of the amplification units is coupled to one of the sensing electrodes so as to output an amplified sensing signal. The analog signal processing unit demodulates a differential signal of the amplified sensing signals outputted by two adjacent amplification units or demodulates the amplified sensing signal outputted by the amplification units to generate a dc signal. The AD converter converts the dc signal to a digital signal.

公开(公告)号：US10831321B2

公开(公告)日：2020-11-10

申请号：US15957726

申请日：2018-04-19

Applicant: PixArt Imaging Inc.

Inventor： Kok-Siang Tan ,  Yu-Han Chen ,  Meng-Lin Yu ,  Kei-Tee Tiew

IPC: G06F3/044

Abstract: There is provided a parallel sensing touch control device including a capacitive sensor array processed by differential unit. In one detection interval, the device is concurrently conducting more than one sensing electrode of the capacitive sensor array so as to reduce a scanning interval of the capacitive sensor array. The differential unit performs a differential operation on detected signals to cancel out common mode noise.