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.

公开(公告)号：US09990091B2

公开(公告)日：2018-06-05

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: G06F3/045 ,  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.

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.

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。