Invention Application
US20150324061A1 BACKGROUND NOISE MEASUREMENT AND FREQUENCY SELECTION IN TOUCH PANEL SENSOR SYSTEMS
有权
背景噪音测量和触摸面板传感器系统中的频率选择
- Patent Title: BACKGROUND NOISE MEASUREMENT AND FREQUENCY SELECTION IN TOUCH PANEL SENSOR SYSTEMS
- Patent Title (中): 背景噪音测量和触摸面板传感器系统中的频率选择
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Application No.: US14512512Application Date: 2014-10-13
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Publication No.: US20150324061A1Publication Date: 2015-11-12
- Inventor: Guozhong Shen , Ozan E. Erdogan , Syed T. Mahmud , Kenneth W. Knox
- Applicant: Qualcomm Technologies, Inc.
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G06F3/044

Abstract:
A touch panel sensor system that can dynamically measure noise and automatically switch to a frequency with minimal noise is described. The touch panel sensor system includes a sensor configured to detect a change in capacitance associated with a touch upon a touch panel. The system also includes a drive module configured to generate a drive signal having a first waveform characteristic (e.g., signal having a periodic waveform characteristic) during a first phase (e.g., sensor phase) and a second drive signal having a second waveform characteristic (e.g., constant voltage signal) during a second phase (e.g., noise detection phase). The first and second drive signals are configured to drive the sensor. The system also includes a measuring module coupled to the sensor that is configured to measure noise having the first waveform characteristic (e.g., periodic waveform characteristic) during the second phase.
Public/Granted literature
- US09552102B2 Background noise measurement and frequency selection in touch panel sensor systems Public/Granted day:2017-01-24
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