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公开(公告)号：US20200285384A1
公开(公告)日：2020-09-10
申请号：US16788417
申请日：2020-02-12
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Kusuma Adi NINGRAT , Ade PUTRA
Abstract: A touch screen controller includes driving circuitry coupled to a conductive line through a resistance and drives that conductive line with a driving signal passed through the resistance at a drive frequency. Sensing circuitry is coupled to that conductive line and senses a voltage at that conductive line, the voltage being a function of a capacitance seen by that conductive line. Analog to digital conversion circuitry is coupled to the sensing circuitry and samples the sensed voltage at a sampling frequency to produce samples. Processing circuitry is coupled to the analog to digital conversion circuitry and directly calculates a tangent of a phase shift of the voltage due to the resistance and the capacitance from the samples, and determines a self touch value for that conductive line as a function of the tangent of the phase shift of the voltage.
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192.发明授权公开(公告)号：US10725574B2
公开(公告)日：2020-07-28
申请号：US16220500
申请日：2018-12-14
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Cam Chung La , Kien Beng Tan
Abstract: A device includes a touch and pressure sensitive screen having touch pressure sensors and a controller. The controller acquires touch pressure data from the plurality of touch pressure sensors. For each touch pressure sensor, the controller determines whether the touch pressure data from that touch pressure sensor is indicative of abnormal operation of that touch pressure sensor. Where no abnormal operation is indicated, the controller sums the touch pressure data from each of the touch pressure sensors to produce a touch pressure output. Where abnormal operation is indicated, the controller sums the touch pressure data from each of the touch pressure sensors and multiply the sum by a correction factor to produce the touch pressure output.
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193.发明授权公开(公告)号：US10712883B2
公开(公告)日：2020-07-14
申请号：US15893207
申请日：2018-02-09
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Manivannan Ponnarasu
Abstract: Disclosed herein is a touch screen controller operable with a touch screen. The touch screen controller includes input circuitry to receive touch data from the touch screen, and processing circuitry. The processing circuitry acquires mutual capacitance touch strength values from the touch screen, determines when the mutual capacitance touch strength values define a pre-validated donut touch pattern, and reads self capacitance touch strength values for lines that are contained within bounds of the pre-validated donut touch pattern. If the self capacitance touch strength values for lines contained within bounds of the pre-validate donut touch pattern contain a singular peak value, the processing circuitry validates the pre-validated donut touch pattern as representing a single touch.
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194.发明申请公开(公告)号：US20200174597A1
公开(公告)日：2020-06-04
申请号：US16675950
申请日：2019-11-06
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Abhishek SINGH , Hugo GICQUEL
Abstract: Disclosed herein is a circuit including a driver circuit applying a received drive signal to a capacitive sensing line of a capacitive touch panel as a boosted drive signal, the driver circuit powered by a boosted supply voltage. A charge pump circuit receives an input supply voltage and output the boosted supply voltage, the charge pump circuit including a voltage sensing circuit to sense the boosted supply voltage and a comparison circuit to compare the sensed boosted supply voltage to a threshold and produce a comparison signal. A control circuit determines a ratio of a pulse width of the comparison signal to the drive signal, and tunes operation of the charge pump circuit to drive the ratio to match a performance threshold.
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公开(公告)号：US20200153399A1
公开(公告)日：2020-05-14
申请号：US16184778
申请日：2018-11-08
Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD
Inventor： Supriya Raveendra HEGDE , Hugo GICQUEL
IPC: H03F3/45
Abstract: A feedback stage for an integrator circuit is provided. The integrator receives a first input current and a second input current that include respective measurement current components and an offset current component. The integrator integrates the first input current and the second input current and generates a first output voltage and a second output voltage. The feedback stage including a transconductance amplifier detects a difference between the first output voltage and the second output voltage and sinks or sources a first output current and a second output current based on the difference between the first output voltage and the second output voltage. The first output current is additively combined with the first input current and the second output current is additively combined with the second input current to mitigate the offset current component at an input of the integrator.
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Patent Agency Ranking
公开(公告)号：US10599276B2
公开(公告)日：2020-03-24
申请号：US16162925
申请日：2018-10-17
Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD
Inventor： Praveesh Chandran , Lokesh Kumar Korapati , Mythreyi Nagarajan
Abstract: 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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公开(公告)号：US10540040B2
公开(公告)日：2020-01-21
申请号：US15199332
申请日：2016-06-30
Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD
Inventor： Yannick Guedon
IPC: G06F3/041 , G06F1/32 , G06F3/044 , G06F1/16 , G06F1/3234
Abstract: Dual power supply and energy recovery techniques are used in a capacitive touch panel that employs a concurrent drive scheme. A dual supply output buffer boosts a capacitor from an intermediate voltage level to a high voltage level. Energy recovery exchanges stored energy between a capacitor and an inductor. When both techniques are used together, power consumption of a capacitive touch panel drive circuit can be reduced dramatically, by as much as about 80%. Such high efficiency touch panels have wide application to ultra-thin touch screens, including those suitable for use in mobile devices and flexible displays.
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公开(公告)号：US10534489B2
公开(公告)日：2020-01-14
申请号：US15838675
申请日：2017-12-12
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Chee Weng Cheong , Dianbo Guo , Kien Beng Tan , Yannick Guedon
Abstract: A capacitive discharge circuit includes a line having a capacitance, a switched capacitor circuit including a capacitor, a switched circuit coupled to the line, and a voltage regulator coupled between the switched capacitor circuit and the switched circuit. A controller operates the switched capacitor circuit and switched circuit to in a first phase, charge the capacitor by coupling the capacitor between a common mode and a power supply, and in a second phase, discharge the capacitor by coupling the voltage regulator in series with the capacitor between the power supply node a ground. The controller is also configured to in a third phase, charge the capacitor by coupling the capacitor between the common mode and the power supply, and in a fourth phase, share charge between the line and the capacitor by coupling the voltage regulator and the capacitor in series between the line and the ground.
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公开(公告)号：US10481731B2
公开(公告)日：2019-11-19
申请号：US15386291
申请日：2016-12-21
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Leonard Liviu Dinu , Hugo Gicquel
Abstract: Disclosed herein is an electronic device including a sensing layer including a plurality of sense lines, and a plurality of single ended charge converter circuits each receiving input from a corresponding one of the plurality of sense lines. The electronic device also includes a plurality of current mirror circuits, each respectively mirroring output from one of the plurality of single ended charge converter circuits so as to produce two substantially identical outputs for each of the plurality of single ended charge converter circuits. There may be a plurality of subtractor circuits coupled to the plurality of current mirror circuits, with each of the plurality of subtractor circuits configured to output a voltage that is a function of a difference between outputs from two of the plurality of current mirror circuits associated with adjacent ones of the sense lines.
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200.发明申请公开(公告)号：US20190220142A1
公开(公告)日：2019-07-18
申请号：US15873973
申请日：2018-01-18
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Kusuma Adi Ningrat , Ade Putra
CPC classification number: G06F3/0418 , G06F3/0414 , G06F3/044
Abstract: Disclosed herein is a touch screen controller operable with a touch screen having force lines and sense lines. The touch screen controller includes drive circuitry driving the force lines with a force signal in a touch data sensing mode and not driving the force lines in a noise sensing mode. Sense circuitry senses data at the sense lines in the touch data sensing mode and the noise sensing mode. Processing circuitry samples the data, multiplies the data by a sine multiplier to produce imaginary data, sums the imaginary data, multiplies the data by a cosine multiplier to produce real data, sums the real data, and determines magnitude values of the data as a function of the imaginary data and the real data.
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