公开(公告)号：US20180373381A1

公开(公告)日：2018-12-27

申请号：US16011941

申请日：2018-06-19

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Tae-gil KANG ,  Jay WANG

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/047 ,  G06F3/0488

Abstract: A touch screen controller includes input circuitry receiving touch data from the touch screen. Processing circuitry acquires touch data from the input circuitry in a self-capacitance sensing mode, locates a force island and locates a sense island. A length of the force island and a length of the sense island is calculated. If the length of the force island is greater than a threshold force length and if the length of the sense island is greater than a threshold sense length, then the product of the lengths is calculated, and if greater than a threshold size, designated a valid area. Touch data in the valid area is then acquired in mutual-capacitance sensing mode, and represents palm touch if a maximum strength value in the valid area is less than a maximum area threshold and if a minimum strength value in the valid area is greater than a minimum area threshold.