Invention Application
- Patent Title: NOISE CANCELLATION TECNIQUE FOR CAPACITIVE TOUCHSCREEN CONTROLLER USING DIFFERENTIAL SENSING
- Patent Title (中): 使用差分感测的电容式触控控制器的噪声消除特性
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Application No.: US13934496Application Date: 2013-07-03
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Publication No.: US20160209947A1Publication Date: 2016-07-21
- Inventor: Ashutosh R. Joharapurkar , Jean C. Le , Natarajan Viswanathan , Patrick Chan
- Applicant: Qualcomm Technologies, Inc.
- Main IPC: G06F3/044
- IPC: G06F3/044 ; G06F3/041

Abstract:
A differential sensing scheme provides a means for detecting one or more touch events on a touch sensitive device in the presence of incident noise. Instead of sensing one touch sensitive channel, such as a row, column, or single touch sensor, multiple touch sensitive channels are sampled at a time. By sampling two nearby channels simultaneously and doing the measurement differentially, noise common to both channels is cancelled. The differential sensing scheme is implemented using simple switch-capacitor AFE circuitry. The originally sensed data on each individual channel is recovered free of common-mode noise. The recovered sensed data is used to determine the presence of one or more touch events and if present the location of each touch event on the touch sensitive device.
Public/Granted literature
- US09442610B2 Noise cancellation technique for capacitive touchscreen controller using differential sensing Public/Granted day:2016-09-13
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