公开(公告)号：US20170139536A1

公开(公告)日：2017-05-18

申请号：US14941256

申请日：2015-11-13

Applicant: PIXART IMAGING INC.

Inventor： Hsin-Chia CHEN ,  Kenneth CRANDALL ,  Raman SAHGAL

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/0416 ,  G06F3/044

Abstract: A capacitive touch system including a capacitive touch panel, a storage element and a control chip is provided. The storage element is configured to store a lookup table which contains a plurality of mixing signals. The control chip concurrently drives the capacitive touch panel with a plurality of frequency division multiplexed drive signals to generate a plurality of detection signals, and determine a plurality pairs of mixing signals according to the lookup table for respectively modulating the detection signals to generate a plurality pairs of modulated detection signals, wherein the pair of mixing signals corresponding to different drive signals are different from one another.