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    Compensation for variations in a capacitive sense matrix
    21.
    发明授权
    Compensation for variations in a capacitive sense matrix 有权

    公开(公告)号：US10209844B2

    公开(公告)日：2019-02-19

    申请号：US15995340

    申请日：2018-06-01

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Yannick Guedon ,  Sze-Kwang Tan ,  Dianbo Guo

    IPC: G06F3/044 ,  G06F3/041

    Abstract: A readout device for a capacitive sense matrix includes a computer readable storage medium configured to store capacitance data. The capacitance data represents capacitance values of the capacitive sense matrix. The readout device also includes a readout circuit configured to receive a signal from the capacitive sense matrix, the readout circuit being configured based upon the capacitance data. Also described are a readout method and a method of compensating for variations in capacitance.

    Short circuit detection module
    25.
    发明授权
    Short circuit detection module 有权

    公开(公告)号：US09714973B2

    公开(公告)日：2017-07-25

    申请号：US14550415

    申请日：2014-11-21

    Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

    Inventor： Dianbo Guo ,  EngJye Ng ,  Abhishek Singh

    IPC: G01R31/08 ,  G01R31/28 ,  G01R31/02 ,  G06F3/041 ,  G06F3/044

    CPC classification number: G01R31/025 ,  G01R31/024 ,  G01R31/08 ,  G06F3/0418 ,  G06F3/044 ,  G06F2203/04111

    Abstract: A microelectronic short circuit detection module is disclosed that locates and distinguishes among different types of short circuits in touch screen panels. Individual short circuit detection circuits are coupled to force and sense lines throughout a wire matrix within the touch screen. If the line is shorted to a neighboring line or any other line carrying an opposite logic state, its logic state will be corrupted by the short and will be held at a value opposite that of the intended input signal. Comparing the input and the output therefore provides an indicator of a short circuit to another force or sense line in the wire matrix. A pair of pull up/down stages is engaged to detect whether the short is coupled to power or ground. A threshold resistor can be varied to adjust detection sensitivity. By conducting a serial test, matrix coordinates of the short circuit can be identified.

    Touch screen with palm rejection in the presence of charger noise
    26.
    发明授权
    Touch screen with palm rejection in the presence of charger noise 有权

    公开(公告)号：US09710104B2

    公开(公告)日：2017-07-18

    申请号：US14245915

    申请日：2014-04-04

    Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

    Inventor： CheeWeng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan

    IPC: G06F3/041

    CPC classification number: G06F3/0418

    Abstract: A touch screen device having a touch screen panel and a method for operating a touch screen device are provided. The method includes monitoring, during a noise monitoring phase, channel signals of a first set of channels and a second set of channel of the touch screen panel, detecting a stylus signal in response to a channel signal greater than a stylus threshold and less than a palm threshold, selecting the first set of channels when the stylus signal is detected on at least one channel of the first set of channels and is not detected on the second set of channels, and selecting the second set of channels when the stylus signal is detected on at least one channel of the second set of channels and is not detected on the first set of channels.

    METHOD AND APPARATUS FOR BLOCKING ACCUMULATION OF ELECTRICAL FAST TRANSIENT (EFT) NOISE
    27.
    发明申请
    METHOD AND APPARATUS FOR BLOCKING ACCUMULATION OF ELECTRICAL FAST TRANSIENT (EFT) NOISE 有权
    阻塞电气瞬态（EFT）噪声累积的方法和装置

    公开(公告)号：US20160378222A1

    公开(公告)日：2016-12-29

    申请号：US14753129

    申请日：2015-06-29

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Chee Weng Cheong ,  EngJye Ng ,  Dianbo Guo ,  Chaochao Zhang ,  Kusuma Adi Ningrat

    IPC: G06F3/044

    CPC classification number: G06F3/044

    Abstract: A charge sensing circuit generates a voltage in a sensing period that is indicative of sensed charge. The generated voltages are accumulated by an accumulator circuit over a number of sensing periods. A noise detection circuit senses when the voltage generated by the charge sensing circuit is outside of a boundary and generates a detection signal in response thereto. A control circuit, in response to the detection signal, controls the accumulator circuit to block accumulation of the voltages generated by the charge sensing circuit during at least the sensing period in which the detection signal is generated. An analog-to-digital converter circuit then converts an accumulated output voltage from the accumulator circuit to a digital value at the end of an accumulation time period that includes the sensing periods. The end of the accumulation time period is delayed by at least one sensing period in response to the detection signal.

    Abstract translation: 电荷感测电路在感测周期中产生指示感测电荷的电压。 所产生的电压在多个感测周期上由累加器电路累积。 噪声检测电路检测由电荷感测电路产生的电压何时在边界之外，并响应于此产生检测信号。 响应于检测信号，控制电路在至少产生检测信号的感测周期期间控制累加器电路阻止由电荷感测电路产生的电压的累积。 然后，模数转换器电路在包括感测周期的累积时间周期结束时将来自累加器电路的累积输出电压转换为数字值。 积累时间段的结束响应于检测信号延迟至少一个感测周期。

    System and method for improved synchronization between devices
    28.
    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.

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