公开(公告)号：US20160291797A1

公开(公告)日：2016-10-06

申请号：US15176006

申请日：2016-06-07

Applicant: QUALCOMM Technologies, Inc.

Inventor： Ashutosh Ravindra Joharapurkar ,  Patrick Yin Chan ,  David Allen ,  Natarajan Viswanathan

IPC: G06F3/041 ,  G06F3/044 ,  H03K17/96

Abstract: Random sampling techniques include techniques for reducing or eliminating errors in the output of capacitive sensor arrays such as touch panels. The channels of the touch panel are periodically sampled to determine the presence of one or more touch events. Each channel is individually sampled in a round robin fashion, referred to as a sampling cycle. During each sampling cycle, all channels are sampled once. Multiple sampling cycles are performed such that each channel is sampled multiple times. Random sampling techniques are used to sample each of the channels. One random sampling technique randomizes a starting channel in each sampling cycle. Another random sampling technique randomizes the selection of all channels in each sampling cycle. Yet another random sampling technique randomizes the sampling cycle delay period between each sampling cycle. Still another random sampling technique randomizes the channel delay period between sampling each channel.

Abstract translation: 随机采样技术包括用于减少或消除诸如触摸面板的电容式传感器阵列的输出中的误差的技术。 周期性地对触摸面板的通道进行采样，以确定是否存在一个或多个触摸事件。 每个通道以循环方式单独采样，称为采样周期。 在每个采样周期期间，所有通道都被采样一次。 执行多个采样周期，使得每个通道被多次采样。 随机采样技术用于对每个通道进行采样。 一个随机采样技术将每个采样周期中的起始通道随机化。 另一种随机采样技术随机化了每个采样周期中所有信道的选择。 另一种随机抽样技术使每个采样周期之间的采样周期延迟周期随机化。 另一种随机采样技术使每个通道采样之间的通道延迟周期随机化。

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。