公开(公告)号：US20190064999A1

公开(公告)日：2019-02-28

申请号：US16058150

申请日：2018-08-08

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Tae-gil Kang ,  Jay Wang

IPC: G06F3/041 ,  G06F3/044

Abstract: A capacitive panel is scanned with an AC signal having pulses at a first frequency to produce a first frame of mutual capacitance data and pulses at a second frequency, different from the first frequency, to produce a second frame of mutual capacitance data. If neither the first nor second frames of mutual capacitance data is perturbed by noise, then data of the first and second frames of mutual capacitance data is averaged. The averaged data is then used in centroid processing.

公开(公告)号：US10795493B2

公开(公告)日：2020-10-06

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 ,  G06F3/0488 ,  G06F3/047 ,  G06F3/044

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.

公开(公告)号：US20190050079A1

公开(公告)日：2019-02-14

申请号：US16055922

申请日：2018-08-06

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Jay Wang ,  Tae-gil Kang

IPC: G06F3/044 ,  H03K17/96

CPC classification number: G06F3/041662 ,  G06F3/0418 ,  G06F3/044 ,  G06F3/0443 ,  G06F3/0446

Abstract: A data frame in a touch capacitive sensing circuit includes both mutual capacitance data and self capacitance data. The mutual capacitance data and self capacitance data of the frame are filtered to define mutual capacitance and self capacitance islands. Centroids of the mutual capacitance and self capacitance islands are calculated and then processed in a weighted mixing operation to produce a hybrid centroid that more accurately locates the coordinates of a detected touch/hover.