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1. 发明授权

US10942601B2 Mutual hover protection for touchscreens 有权
公开(公告)号：US10942601B2
公开(公告)日：2021-03-09
申请号：US16532872
申请日：2019-08-06
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Gee-Heng Loh , Ravi Bhatia , Ys On
IPC分类号： G09G5/00 , G06F3/041 , G06F3/044
摘要： 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.

2. 发明授权

US10175807B2 Support of narrow tip styluses on touch screen devices 有权
公开(公告)号：US10175807B2
公开(公告)日：2019-01-08
申请号：US14974299
申请日：2015-12-18
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Manivannan Ponnarasu , Mythreyi Nagarajan
IPC分类号： G06F3/041 , G06F3/0354 , G06F3/044
摘要： 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.

3. 发明授权

US09791985B2 Cross hatch ITO sensor pattern for touchscreens 有权
公开(公告)号：US09791985B2
公开(公告)日：2017-10-17
申请号：US14803190
申请日：2015-07-20
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Ravi Bhatia
IPC分类号： G06F3/044 , H05K1/02 , H05K1/09
CPC分类号： G06F3/044 , G06F2203/04111 , H05K1/0296 , H05K1/09
摘要： 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.

4. 发明授权

US09229576B2 Apparatus and method for preventing false touches in touch screen systems 有权
标题翻译：用于防止触摸屏系统中的假触摸的装置和方法
公开(公告)号：US09229576B2
公开(公告)日：2016-01-05
申请号：US13648149
申请日：2012-10-09
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD (SINGAPORE)
发明人： HonSiong Ng , Praveesh Chandran , Mythreyi Nagarajan , Ravi Bhatia
IPC分类号： G06F3/041
CPC分类号： G06F3/0418
摘要： 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.
摘要翻译：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。

5. 发明申请

US20180074619A1 SYSTEM AND METHOD OF COMMUNICATION BETWEEN A CAPACITIVE TOUCH SCREEN AND AN ACTIVE STYLUS 审中-公开
公开(公告)号：US20180074619A1
公开(公告)日：2018-03-15
申请号：US15813906
申请日：2017-11-15
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Baranidharan Karuppusamy , Giuseppe Noviello , Chee Weng Cheong , Leonard Liviu Dinu , Dianbo Guo , Kien Beng Tan , Chaochao Zhang
IPC分类号： G06F3/044 , G06F3/0354 , G06F3/041 , G06F3/038
CPC分类号： G06F3/044 , G06F3/03545 , G06F3/0383 , G06F3/0416
摘要： 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.

6. 发明授权

US09703946B2 Secure pairing method, circuit and system for an intelligent input device and an electronic device 有权
公开(公告)号：US09703946B2
公开(公告)日：2017-07-11
申请号：US14231360
申请日：2014-03-31
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD
发明人： Praveesh Chandran , Ravi Bhatia
IPC分类号： H04L29/06 , G06F21/44 , G06F3/041 , G09G5/12
CPC分类号： G06F21/44 , G06F3/03545 , G06F3/0383 , G06F3/0416 , G06F21/445 , G06F2203/0384 , G09G5/12 , G09G2354/00
摘要： 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.

7. 发明申请

US20170075469A1 MUTUAL HOVER PROTECTION FOR TOUCHSCREENS 审中-公开
标题翻译：触摸屏的互换保护
公开(公告)号：US20170075469A1
公开(公告)日：2017-03-16
申请号：US14852847
申请日：2015-09-14
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Gee Heng Loh , Ravi Bhatia , Ys On
IPC分类号： G06F3/041 , G06F3/044
CPC分类号： G06F3/0416 , G06F3/044 , G06F2203/04108
摘要： 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.
摘要翻译：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。

8. 发明授权

US10599276B2 Common mode noise reduction in capacitive touch sensing 有权
公开(公告)号：US10599276B2
公开(公告)日：2020-03-24
申请号：US16162925
申请日：2018-10-17
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD
发明人： Praveesh Chandran , Lokesh Kumar Korapati , Mythreyi Nagarajan
IPC分类号： G06F3/044 , G06F3/041
摘要： The present disclosure is directed to a system and method to remove common mode noise projected onto a touch sensor array from a display. The system is configured to activate two rows of electrodes at the same time, while coupling remaining rows of electrodes to ground. A first one of the two activated rows is used for detection of a touch and a second one of the two activated rows is used to detect common mode noise from the display. The common mode noise detected by the second row is removed from signals received from a plurality of columns of the touch sensor array.

9. 发明授权

US10185454B2 System and method of communication between a capacitive touch screen and an active stylus 有权
公开(公告)号：US10185454B2
公开(公告)日：2019-01-22
申请号：US15813906
申请日：2017-11-15
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Baranidharan Karuppusamy , Giuseppe Noviello , Chee Weng Cheong , Leonard Liviu Dinu , Dianbo Guo , Kien Beng Tan , Chaochao Zhang
IPC分类号： G06F3/044 , G06F3/0354 , G06F3/038 , G06F3/041
摘要： 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.

10. 发明授权

US10120509B2 Common mode noise reduction in capacitive touch sensing 有权
公开(公告)号：US10120509B2
公开(公告)日：2018-11-06
申请号：US14982349
申请日：2015-12-29
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD
发明人： Praveesh Chandran , Lokesh Kumar Korapati , Mythreyi Nagarajan
IPC分类号： G06F3/044 , G06F3/041 , G06F11/00
摘要： The present disclosure is directed to a system and method to remove common mode noise projected onto a touch sensor array from a display. The system is configured to activate two rows of electrodes at the same time, while coupling remaining rows of electrodes to ground. A first one of the two activated rows is used for detection of a touch and a second one of the two activated rows is used to detect common mode noise from the display. The common mode noise detected by the second row is removed from signals received from a plurality of columns of the touch sensor array.

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