公开(公告)号：US09733293B1

公开(公告)日：2017-08-15

申请号：US14032346

申请日：2013-09-20

Applicant: Qualcomm Technologies, Inc.

Inventor： Guozhong Shen ,  Jon Pearson

IPC: G01R31/28 ,  G01R31/02

CPC classification number: G01R31/024 ,  G06F3/0418 ,  G06F3/044

Abstract: Techniques are described for testing a capacitive touch panel for the presence or absence of discontinuities. A pixel matrix is determined for a capacitive touch panel. The pixel matrix comprises pixel values representative of mutual capacitance of respective pixels of the capacitive touch panel. A difference matrix is generated from the pixel matrix. The difference matrix contains differences in pixel values for respective pixels of the capacitive touch panel with respect to pixel values of adjacent pixels. A determination may then be made from the difference matrix whether respective ones of the pixels of the capacitive touch panel contain a discontinuity.

公开(公告)号：US09921668B1

公开(公告)日：2018-03-20

申请号：US13749829

申请日：2013-01-25

Applicant: Qualcomm Technologies, Inc.

Inventor： Trishabh Chadda ,  Guozhong Shen ,  Jon Pearson

IPC: G06F3/041

CPC classification number: G06F3/041 ,  G06F3/0418 ,  G06F3/044

Abstract: A touch panel controller is disclosed herein. The controller includes output circuitry for driving a touch panel sensor and input circuitry for determining when an object performs a touch event over the touch panel sensor. The controller is configured to cause the output circuitry to generate drive signals having a different frequency characteristic when the controller determines noise present within the sensor is above a noise threshold. The controller communicates with a software device driver on a host processor to store signal baseline images for a range of frequencies during production test and power-up. The controller is configured to receive a signal baseline image from the host processor when the controller causes change to a different drive frequency. The controller is configured to cause change to the different drive frequency while the object is still performing the touch event over the touch panel sensor.