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    System and method for improved synchronization between devices
    41.
    发明授权
    System and method for improved synchronization between devices 有权

    公开(公告)号：US10394349B2

    公开(公告)日：2019-08-27

    申请号：US15953017

    申请日：2018-04-13

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Chee Weng Cheong ,  Leonard Liviu Dinu ,  Dianbo Guo ,  Kien Beng Tan

    IPC: G06F3/038 ,  G06F3/041 ,  H04L27/00 ,  G06F3/0354

    Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals. Further, the detection window duration and start times may be adjusted based on previously detected (or undetected) synchronization signals in order to compensate for noise overshadowing synchronization signals.

    Dead zone compensation for touch screens
    42.
    发明授权
    Dead zone compensation for touch screens 有权

    公开(公告)号：US10209831B2

    公开(公告)日：2019-02-19

    申请号：US15847266

    申请日：2017-12-19

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Rooney Kim ,  Lokesh Kumar Korapati

    IPC: G06F3/041 ,  G06F3/044

    Abstract: A method of compensated touch data values disclosed herein includes acquiring touch data values about a dead sensing zone of a touch screen, and determining a peak value of those touch data values. Then, a new peak value is calculated as a function of an average of the peak value and another value of the touch data value, and a sharpness value for the dead sensing zone is generated if a second highest value of the touch data values is less than the new peak value. Thereafter, compensated touch data values are generated for the dead sensing zone if the second highest value is greater than the new peak value.

    Suppression of display noise in touch screen controllers
    44.
    发明授权
    Suppression of display noise in touch screen controllers 有权

    公开(公告)号：US10156945B2

    公开(公告)日：2018-12-18

    申请号：US14936166

    申请日：2015-11-09

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Leonard Liviu Dinu ,  Chao Chao Zhang

    IPC: G06F3/041 ,  G06F3/044

    Abstract: An electronic device includes a touch screen controller. The touch screen controller is configured to asynchronously measure a capacitance between a sense line and a drive line of a sensing layer with respect to a horizontal sync signal of a display layer. In addition, the touch screen controller is also configured to disconnect from the sense line for a given period of time following a rising edge of the horizontal sync signal so as to reduce capacitive coupling of display noise from the horizontal sync signal to the sensing layer.

    Compact touch screen controller having multiplexed sense lines
    45.
    发明授权
    Compact touch screen controller having multiplexed sense lines 有权

    公开(公告)号：US10152161B2

    公开(公告)日：2018-12-11

    申请号：US14736317

    申请日：2015-06-11

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Leonard Dinu

    IPC: G06F3/041 ,  G06F3/044

    Abstract: A touch screen controller is for a drive line emitting a periodic signal and capacitively intersecting sense lines. A selection circuit, for each of a number of portions of the periodic signal equal to a number of the sense lines, couples a first subset of the sense lines to a first output path, and couples a second subset of the sense lines to a second output path, the second subset being sense lines not included in the first subset. Processing circuitry, for each portion of the periodic signal, measures a capacitance of the first output path, measures a capacitance of the second output path, and sums the capacitance of the first output path and the capacitance of the second output path. The processing circuitry determines a capacitance between each sense line of the first and second subsets and the drive line as a function of the sums.

    CAPACITIVE TOUCH SCREEN WITH TIME OVERLAPPED CONCURRENT SCANNING OPERATION USING CODED DRIVE SIGNALS
    46.
    发明申请
    CAPACITIVE TOUCH SCREEN WITH TIME OVERLAPPED CONCURRENT SCANNING OPERATION USING CODED DRIVE SIGNALS 审中-公开

    公开(公告)号：US20180329540A1

    公开(公告)日：2018-11-15

    申请号：US16042055

    申请日：2018-07-23

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Kien Beng Tan

    IPC: G06F3/044 ,  G06F3/041

    CPC classification number: G06F3/044 ,  G06F3/0416

    Abstract: A capacitive sensing system includes a capacitive sensing panel with drive lines and sense lines. Each drive line includes a drive circuit. A code generator operates to generate modulation codes. A drive controller generates drive signals wherein each drive signal is modulated by one of the modulation codes. The generated drive signals are applied to the drive lines through the drive circuits. The drive controller operates to simultaneously generate the drive signals for application to a corresponding group of drive lines during a drive period. Separate groups of drive lines are sequentially driven with the same drive signals during drive periods that only partially overlap.

    FREQUENCY DETECTION TO PERFORM ADAPTIVE PEAK CURRENT CONTROL
    47.
    发明申请
    FREQUENCY DETECTION TO PERFORM ADAPTIVE PEAK CURRENT CONTROL 审中-公开

    公开(公告)号：US20180294722A1

    公开(公告)日：2018-10-11

    申请号：US16004253

    申请日：2018-06-08

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Kong Yin LEONG

    IPC: H02M3/158 ,  H02M1/088 ,  H02M1/00

    CPC classification number: H02M3/158 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0009 ,  H02M2001/0019

    Abstract: The amount of power being output to the load is sensed by sampling the frequency of the pulse width modulation signal that is controlling the switch that is providing the power to the load. If the pulse width modulation signal has a high frequency, then it will be providing higher power to the load. As the power drawn by the load decreases, the frequency of the pulse width modulation power supply signal will decrease. By sensing and periodically sampling the frequency of the pulse width modulation signal that is providing power, the demand of the load can be quickly and accurately determined. As the power demand of the load decreases, the peak current that the power supply switch can provide also decreases. The permitted peak current dynamically changes to adapt to the power drawn by the load.

    Self-sensing touch panel
    49.
    发明授权
    Self-sensing touch panel 有权

    公开(公告)号：US10031620B2

    公开(公告)日：2018-07-24

    申请号：US15199792

    申请日：2016-06-30

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Hugo Gicquel ,  EngJye Ng

    IPC: G06F3/044 ,  G06F3/041

    Abstract: A method of differential self-capacitance measurement is used to enhance a signal-to-noise ratio of sense lines in a touch panel display, thereby improving touch sensor accuracy. The differential self-capacitance measurement is implemented for a touch panel using charge sharing between adjacent sense lines of the touch panel matrix. Sequential differential self-capacitance measurements can be compared with one another by computing the difference |CS1−CS2|−|CS2−CS1| to sense a change caused by an intervening event. By scanning the entire touch panel matrix, events can be tracked across the touch panel.

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