公开(公告)号：US10416802B2

公开(公告)日：2019-09-17

申请号：US14852847

申请日：2015-09-14

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Gee-Heng Loh ,  Ravi Bhatia ,  Ys On

IPC: G06F3/041 ,  G06F3/044

Abstract: Disclosed is a touch sensor and method for detecting a touch in a capacitive touchscreen application, wherein the touch sensor is capable of distinguishing between a finger hovering above the touch sensor and a touch from a stylus having a small contact surface area without having to adjust the sensitivity of the touch sensor. The touch sensor includes a first sensing electrode, a transmit electrode, and a second sensing electrode, wherein the second sensing electrode is positioned substantially around the perimeter of the inner circuitry (i.e., transmit electrode and first sensing electrode). A touch is detected by sensing changes in a first capacitance between the transmit electrode and first sensing electrode and a second capacitance between the transmit electrode and second sensing electrode. The changes in the first and second capacitances are compared to determine whether the changes in the capacitances are due to a finger hover or a touch.

公开(公告)号：US20170177136A1

公开(公告)日：2017-06-22

申请号：US14974299

申请日：2015-12-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041 ,  G06F3/0354 ,  G06F3/044

CPC classification number: G06F3/0416 ,  G06F3/03545 ,  G06F3/044 ,  G06F2203/04106

Abstract: An electronic device disclosed herein includes a touch screen controller to identify an island i.e., a matrix of acquired touch data values, the island including adjacent touch data values indicating a potential touch of a touch sensitive screen. A first sharpness of the island is calculated using a first normalization type and not a second normalization type. A second sharpness of the island is calculated using the first and second normalization types if the first sharpness is greater than the sharpness threshold. A dynamic variance threshold is determined as a function of the second sharpness. A dynamic strength threshold is determined as a function of the second sharpness if a variance of the island is greater than the dynamic variance threshold, and the island is determined to be a valid stylus island if the peak strength is greater than the dynamic strength threshold.

公开(公告)号：US09626049B2

公开(公告)日：2017-04-18

申请号：US14269295

申请日：2014-05-05

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Chee Yu Ng

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416 ,  G06F2203/04101

Abstract: A capacitive touch panel includes a first sensor pattern and second sensor pattern. The first sensor pattern supports mutual-capacitance detection and the second sensor pattern supports self-capacitance detection. The first sensor pattern includes row conductors and column conductors which intersect each other at mutual-capacitance sensing locations. The second sensor pattern includes island conductors. The island conductors are grouped in clusters of conductors, each cluster providing a self-capacitance sensing location. Control circuitry coupled to the first and second sensor patterns functions to make touch/hover position detections by sensing changes in capacitance at the mutual-capacitance and self-capacitance nodes. The row and column conductors include openings, and the island conductors are positioned in vertical alignment with corresponding openings in the conductors.

公开(公告)号：US09335876B2

公开(公告)日：2016-05-10

申请号：US14218079

申请日：2014-03-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran

IPC: G06F1/16 ,  G06F3/044

CPC classification number: G06F3/044 ,  G06F2203/04111

Abstract: A capacitive sensing structure comprises a plurality of first sensors electrically coupled to each other in a first direction, each first sensor comprising: a first arm extending along the first direction, and a second arm extending along a second direction perpendicular to the first direction and bisecting the first arm to form open regions at least partially defined by the first and second arm; a plurality of second sensors electrically coupled to each other in the second direction, each second sensor comprising: a first arm extending along the second direction, and a second arm extending along the first direction and bisecting the first arm to form open regions at least partially defined by the first and second arm; and a plurality of single electrically conductive and electrically floating structures, each disposed within open regions of adjacent first and second sensors.

Abstract translation: 电容感测结构包括在第一方向上彼此电耦合的多个第一传感器，每个第一传感器包括：沿第一方向延伸的第一臂和沿垂直于第一方向的第二方向延伸的第二臂， 所述第一臂形成至少部分地由所述第一臂和所述第二臂限定的开放区域; 多个第二传感器在第二方向上彼此电耦合，每个第二传感器包括：沿着第二方向延伸的第一臂，以及沿第一方向延伸的第二臂，将第一臂平分，以至少部分地形成开放区域 由第一和第二臂限定; 以及多个单个导电和电浮置结构，每个结构设置在相邻的第一和第二传感器的开放区域内。

公开(公告)号：US09178545B2

公开(公告)日：2015-11-03

申请号：US13861057

申请日：2013-04-11

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Hon Siong Ng ,  Kusuma Adi Ningrat ,  Praveesh Chandran

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04B1/10

CPC classification number: H04B1/1027 ,  H03H17/0294 ,  H03H17/04

Abstract: A digital filter receives a sequence of input signal values. A filtering block performs a filtering operation on sequence of input signal values that is controlled by filter coefficients. A control block also receives the sequence of input signal values. The control block evaluates detected changes over time with respect to the sequence of input signal values and selects values for the filter coefficients based on the detected changes. The detected change over time provides an indication of the whether the sequence of input signal values is changing signal state. If so, the filter coefficients are selected to emphasize signal response time over signal noise filtering for the filtering operation. Otherwise, the filter coefficients are selected to emphasize signal noise filtering over signal response time for the filtering operation.

Abstract translation: 数字滤波器接收输入信号值的序列。 滤波块对由滤波器系数控制的输入信号值的序列执行滤波操作。 控制块还接收输入信号值的序列。 控制块根据输入信号值的序列来评估随时间的检测到的变化，并且基于检测到的变化来选择滤波器系数的值。 检测到的随时间的变化提供输入信号值的序列是否正在改变信号状态的指示。 如果是这样，则选择滤波器系数以强调针对滤波操作的信号噪声滤波的信号响应时间。 否则，滤波器系数被选择为强调用于滤波操作的信号响应时间的信号噪声滤波。

公开(公告)号：US20140307840A1

公开(公告)日：2014-10-16

申请号：US13861057

申请日：2013-04-11

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE. LTD.

Inventor： Hon Siong Ng ,  Kusuma Adi Ningrat ,  Praveesh Chandran

IPC: H04B1/10

CPC classification number: H04B1/1027 ,  H03H17/0294 ,  H03H17/04

Abstract: A digital filter receives a sequence of input signal values. A filtering block performs a filtering operation on sequence of input signal values that is controlled by filter coefficients. A control block also receives the sequence of input signal values. The control block evaluates detected changes over time with respect to the sequence of input signal values and selects values for the filter coefficients based on the detected changes. The detected change over time provides an indication of the whether the sequence of input signal values is changing signal state. If so, the filter coefficients are selected to emphasize signal response time over signal noise filtering for the filtering operation. Otherwise, the filter coefficients are selected to emphasize signal noise filtering over signal response time for the filtering operation.

Abstract translation: 数字滤波器接收输入信号值的序列。 滤波块对由滤波器系数控制的输入信号值的序列执行滤波操作。 控制块还接收输入信号值的序列。 控制块根据输入信号值的序列来评估随时间的检测到的变化，并且基于检测到的变化来选择滤波器系数的值。 检测到的随时间的变化提供输入信号值的序列是否正在改变信号状态的指示。 如果是这样，则选择滤波器系数以强调针对滤波操作的信号噪声滤波的信号响应时间。 否则，滤波器系数被选择为强调用于滤波操作的信号响应时间的信号噪声滤波。