公开(公告)号：US20160209947A1

公开(公告)日：2016-07-21

申请号：US13934496

申请日：2013-07-03

Applicant: Qualcomm Technologies, Inc.

Inventor： Ashutosh R. Joharapurkar ,  Jean C. Le ,  Natarajan Viswanathan ,  Patrick Chan

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/0418 ,  G06F3/0416 ,  G06F3/044 ,  H03K17/96 ,  H03K2217/96062

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.

Abstract translation: 差分感测方案提供了用于在存在入射噪声的情况下检测触敏装置上的一个或多个触摸事件的装置。 代替检测一个触敏通道（例如行，列或单触摸传感器），一次对多个触摸敏感通道进行采样。 通过同时采样两个附近的通道并进行差分测量，两个通道共同的噪声被取消。 差分感测方案采用简单的开关电容AFE电路实现。 每个独立通道上的原始感测数据被恢复，没有共模噪声。 恢复的感测数据用于确定一个或多个触摸事件的存在，并且如果存在触摸敏感设备上的每个触摸事件的位置。