公开(公告)号：US10942601B2

公开(公告)日：2021-03-09

申请号：US16532872

申请日：2019-08-06

Applicant: STMicroelectronics Asia Pacific Pte Ltd

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

IPC: G09G5/00 ,  G06F3/041 ,  G06F3/044

Abstract: A capacitive sensing structure includes a first sensing electrode located in a first layer for sensing a first capacitance and producing a first sense signal indicative of the sensed first capacitance. A transmit electrode is located in the first layer and positioned surrounding 90%+ of a perimeter of the first sensing electrode. A second sensing electrode is located in the first layer and positioned surrounding 90%+ of a perimeter of the transmit electrode, the second sensing electrode to sense a second capacitance and produce a second sense signal indicative of the sensed second capacitance. Controller circuitry receives the first and second sense signals, compares a change in the sensed first capacitance to a change in the sensed second capacitance, and produces an output signal indicative of a user touch based upon the comparison between the change in the sensed first capacitance and the change in the sensed second capacitance.

公开(公告)号：US10175807B2

公开(公告)日：2019-01-08

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

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：US09791985B2

公开(公告)日：2017-10-17

申请号：US14803190

申请日：2015-07-20

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Ravi Bhatia

IPC: G06F3/044 ,  H05K1/02 ,  H05K1/09

CPC classification number: G06F3/044 ,  G06F2203/04111 ,  H05K1/0296 ,  H05K1/09

Abstract: In one implementation, a capacitive sensing structure comprises rows of first sensors electrically coupled together and columns of second sensors electrically coupled together, wherein the first sensors include: a first arm extending in a first direction and having a first plurality of finger structures extending therefrom, a second arm extending in the first direction and having a second plurality of finger structures extending therefrom, and an end portion connecting the arms, wherein the first sensors define open regions that are occupied by the second sensors. In a second implementation, a capacitive sensing structure comprises rows of first sensors and columns of second sensors, wherein each of the first sensors includes an elongated portion having finger structures extending therefrom, and wherein each of the second sensors includes a primary portion connected to secondary portions via arms, wherein the secondary portions occupy gaps defined by the finger structures of the first sensors.

公开(公告)号：US09229576B2

公开(公告)日：2016-01-05

申请号：US13648149

申请日：2012-10-09

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD (SINGAPORE)

Inventor： HonSiong Ng ,  Praveesh Chandran ,  Mythreyi Nagarajan ,  Ravi Bhatia

IPC: G06F3/041

CPC classification number: G06F3/0418

Abstract: A method comprises during a frame period finding a first EFT noise influenced sensor of a touch screen panel, determining whether the first EFT noise influenced sensor is located at a last transmitting/driving line of the touch screen panel, designating the frame period as a noise influenced frame period using an absolute value threshold if the first EFT noise influenced sensor is not located at the last transmitting/driving line and designating the frame period as the noise influenced frame period using a percentage threshold if the first EFT noise influenced sensor is located at the last transmitting/driving line.

Abstract translation: 一种方法包括在帧周期期间找到触摸屏面板的第一EFT噪声影响传感器，确定所述第一EFT噪声影响传感器是否位于所述触摸屏面板的最后发射/驱动线上，将所述帧周期指定为噪声 如果第一EFT噪声影响传感器不位于最后的发射/驱动线路，并且如果第一EFT噪声影响传感器位于位置时，使用百分比阈值指定帧周期作为噪声影响帧周期，则使用绝对值阈值 最后一个发射/行驶线。

公开(公告)号：US20180074619A1

公开(公告)日：2018-03-15

申请号：US15813906

申请日：2017-11-15

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Liviu Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/044 ,  G06F3/0354 ,  G06F3/041 ,  G06F3/038

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

公开(公告)号：US09703946B2

公开(公告)日：2017-07-11

申请号：US14231360

申请日：2014-03-31

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Praveesh Chandran ,  Ravi Bhatia

IPC: H04L29/06 ,  G06F21/44 ,  G06F3/041 ,  G09G5/12

CPC classification number: G06F21/44 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416 ,  G06F21/445 ,  G06F2203/0384 ,  G09G5/12 ,  G09G2354/00

Abstract: A method of pairing an intelligent input device with an electronic device includes transmitting a start pairing identifier and receiving a unique identifier that identifies the intelligent input device. The method further includes authenticating the unique identifier using authentication information stored in the electronic device and transmitting a pairing successful identifier responsive to the unique identifier being authenticated to thereby pair the intelligent input device and the electronic device.

公开(公告)号：US20170075469A1

公开(公告)日：2017-03-16

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

CPC classification number: G06F3/0416 ,  G06F3/044 ,  G06F2203/04108

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.

Abstract translation: 公开了用于检测电容式触摸屏应用中的触摸的触摸传感器和方法，其中触摸传感器能够区分在触摸传感器上方悬停的手指和具有小接触表面积的触针的触摸，而不必调整 触摸传感器的灵敏度。 触摸传感器包括第一感测电极，发射电极和第二感测电极，其中第二感测电极基本上围绕内部电路（即发射电极和第一感测电极）的周边定位。 通过感测发射电极和第一感测电极之间的第一电容的变化以及发射电极和第二感测电极之间的第二电容来检测触摸。 比较第一和第二电容的变化，以确定电容的变化是由于手指悬停还是触摸。

公开(公告)号：US20170269740A1

公开(公告)日：2017-09-21

申请号：US15616294

申请日：2017-06-07

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/044 ,  G06F3/038 ,  G06F3/0354 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

公开(公告)号：US20170024033A1

公开(公告)日：2017-01-26

申请号：US14803190

申请日：2015-07-20

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Praveesh Chandran ,  Ravi Bhatia

IPC: G06F3/044 ,  H05K1/02 ,  H05K1/09 ,  G06F1/16

CPC classification number: G06F3/044 ,  G06F2203/04111 ,  H05K1/0296 ,  H05K1/09

Abstract: In one implementation, a capacitive sensing structure comprises rows of first sensors electrically coupled together and columns of second sensors electrically coupled together, wherein the first sensors include: a first arm extending in a first direction and having a first plurality of finger structures extending therefrom, a second arm extending in the first direction and having a second plurality of finger structures extending therefrom, and an end portion connecting the arms, wherein the first sensors define open regions that are occupied by the second sensors. In a second implementation, a capacitive sensing structure comprises rows of first sensors and columns of second sensors, wherein each of the first sensors includes an elongated portion having finger structures extending therefrom, and wherein each of the second sensors includes a primary portion connected to secondary portions via arms, wherein the secondary portions occupy gaps defined by the finger structures of the first sensors.

Abstract translation: 在一个实施方式中，电容感测结构包括电耦合在一起的第一传感器行和电耦合在一起的第二传感器列，其中第一传感器包括：沿第一方向延伸并具有从其延伸的第一多个指状结构的第一臂， 第二臂，沿着所述第一方向延伸并具有从其延伸的第二多个指形结构，以及连接所述臂的端部，其中所述第一传感器限定由所述第二传感器占据的开放区域。 在第二实施例中，电容感测结构包括第一传感器行和第二传感器列，其中每个第一传感器包括具有从其延伸的指状结构的细长部分，并且其中每个第二传感器包括连接到次级 部分经由臂，其中次要部分占据由第一传感器的手指结构限定的间隙。

公开(公告)号：US20160048234A1

公开(公告)日：2016-02-18

申请号：US14461977

申请日：2014-08-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/044 ,  G06F3/0354

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

Abstract translation: 有源触笔电容耦合到用于通信的电容式触摸面板。 活动的笔在等待模式下操作以从面板接收初始通信。 响应于这样的接收，活动触针与实现时分复用的重复通信帧同步。 从活动手写笔到面板的通信包括：信息通信; 专用于面板的列和/或行的同步通信和通信。 从面板到活动手写笔的通信可以唯一地被寻址到手写笔，或者通常被发送到一组触控笔。