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1. 发明授权

US10503326B2 Display noise compensation in touch screen display using capacitive dividers 有权
公开(公告)号：US10503326B2
公开(公告)日：2019-12-10
申请号：US15247106
申请日：2016-08-25
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Leonard Liviu Dinu , Chee Weng Cheong , Eng Jye Ng
IPC分类号： G06F3/044 , G06F3/041
CPC分类号： G06F3/044 , G06F3/0418
摘要： An electronic device disclosed herein includes a display layer generating display noise based on scanning thereof, and a sensing layer including a plurality of sense lines. A common voltage layer is coupled to the display layer and the sensing layer, with the common voltage layer capacitively coupling the display noise from the display layer to the each of the plurality of sense lines of the sensing layer via a different parasitic impedance. An amplitude of the display noise seen at an input to each sense line is a function of a location of that sense line. The electronic device includes a plurality of compensation impedances, with each compensation impedance coupled to a different one of the plurality of sense lines. Each of the plurality of compensation impedances has an impedance value such that an amplitude of the display noise at an output of each sense line is substantially equal.

2. 发明申请

US20170344158A1 CAPACITIVE DISCHARGE CIRCUIT FOR TOUCH SENSITIVE SCREEN 审中-公开
公开(公告)号：US20170344158A1
公开(公告)日：2017-11-30
申请号：US15679771
申请日：2017-08-17
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Chee Weng Cheong , Dianbo Guo , Kien Beng Tan , Yannick Guedon
IPC分类号： G06F3/044 , G06F3/041
CPC分类号： G06F3/044 , G06F3/041 , G06F3/0418
摘要： 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.

3. 发明授权

US10191589B2 Sampling frequency and accumulator sweeping in a touch screen controller 有权
公开(公告)号：US10191589B2
公开(公告)日：2019-01-29
申请号：US15235974
申请日：2016-08-12
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Hugo Gicquel , Chee Weng Cheong
IPC分类号： G06F3/00 , G06F3/041 , G06F3/044
摘要： A circuit described herein includes a charge to voltage converter circuit having an input coupled to receive a sense signal from a sense node associated with a mutual capacitance to be sensed, and an output. A reset switch is coupled between the output of the charge to voltage converter circuit and the input of the charge to voltage converter. An accumulator circuit is configured to accumulate voltages at the output of the charge to voltage converter circuit and to generate an accumulator output signal. Control circuitry is configured to generate control signals for the reset switch and accumulator circuit so as to reduce noise in the accumulator output signal.

4. 发明申请

US20180059818A1 DISPLAY NOISE COMPENSATION IN TOUCH SCREEN DISPLAY USING CAPACITIVE DIVIDERS 审中-公开
公开(公告)号：US20180059818A1
公开(公告)日：2018-03-01
申请号：US15247106
申请日：2016-08-25
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Leonard Liviu Dinu , Chee Weng Cheong , Eng Jye Ng
IPC分类号： G06F3/044 , G06F3/041
CPC分类号： G06F3/044 , G06F3/0418
摘要： An electronic device disclosed herein includes a display layer generating display noise based on scanning thereof, and a sensing layer including a plurality of sense lines. A common voltage layer is coupled to the display layer and the sensing layer, with the common voltage layer capacitively coupling the display noise from the display layer to the each of the plurality of sense lines of the sensing layer via a different parasitic impedance. An amplitude of the display noise seen at an input to each sense line is a function of a location of that sense line. The electronic device includes a plurality of compensation impedances, with each compensation impedance coupled to a different one of the plurality of sense lines. Each of the plurality of compensation impedances has an impedance value such that an amplitude of the display noise at an output of each sense line is substantially equal.

5. 发明申请

US20160378222A1 METHOD AND APPARATUS FOR BLOCKING ACCUMULATION OF ELECTRICAL FAST TRANSIENT (EFT) NOISE 有权
标题翻译：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
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Chee Weng Cheong , EngJye Ng , Dianbo Guo , Chaochao Zhang , Kusuma Adi Ningrat
IPC分类号： G06F3/044
CPC分类号： G06F3/044
摘要： 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.
摘要翻译：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。

6. 发明授权

US11387676B2 Dual-mode high-efficiency voltage regulator for wireless charging modules 有权
公开(公告)号：US11387676B2
公开(公告)日：2022-07-12
申请号：US17007225
申请日：2020-08-31
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Eng Jye Ng , Chee Weng Cheong , Huiqiao He
IPC分类号： H02J50/10 , H02M1/36 , H02M1/00 , H02J7/02 , H02M1/08
摘要： A system comprising includes a wireless power receiver generating a rectified voltage. A low dropout regulator (LDO) generates a first regulated output voltage from the rectified voltage, during a first phase. A first switch couples the first regulated output voltage to a voltage output node during the first phase. During a second phase, the LDO generates a second regulated output voltage from the rectified voltage. A switching regulator generates a third regulated output voltage during the second phase. A second switch couples the third regulated output voltage to the voltage output node during the second phase. During a third phase, the LDO is disabled, while the switching regulator continues to generate the third regulated output voltage. The first switch opens during the third phase while the second switch remains closed.

7. 发明授权

US11165286B1 Adaptive baseline correction for delta amplification 有权
公开(公告)号：US11165286B1
公开(公告)日：2021-11-02
申请号：US16899990
申请日：2020-06-12
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Teerasak Lee , Chee Weng Cheong , Yannick Guedon , Eng Jye Ng
IPC分类号： H01F27/42 , H01F37/00 , H01F38/00 , H02J50/80 , H03F1/02 , H02J50/10 , H02J50/00
摘要： A data demodulating circuit includes a sensing circuit sensing a power signal applied to a coil at first and second times, and outputting an analog value representing a difference in voltage of the power signal at the first and second times. An analog-to-digital converter digitizes the analog value output by the analog voltage differential sensing circuit to produce a digital code. A compensation circuit, over a period of time, compares a present value of the digital code to a first value of the digital code during the period, and subtracts a given value from the present value of the digital code if the present value is greater than the first value but add the given value to the present value of the digital code if the present value is less than the first value. An accumulator accumulates output of the compensation circuit, and a filter filters output of the accumulator.

8. 发明授权

US09990091B2 Method and apparatus for blocking accumulation of electrical fast transient (EFT) noise 有权
公开(公告)号：US09990091B2
公开(公告)日：2018-06-05
申请号：US14753129
申请日：2015-06-29
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Chee Weng Cheong , EngJye Ng , Dianbo Guo , Chaochao Zhang , Kusuma Adi Ningrat
IPC分类号： G06F3/045 , G06F3/044
CPC分类号： G06F3/044
摘要： 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.

9. 发明申请

US20180046320A1 SAMPLING FREQUENCY AND ACCUMULATOR SWEEPING IN A TOUCH SCREEN CONTROLLER 审中-公开
公开(公告)号：US20180046320A1
公开(公告)日：2018-02-15
申请号：US15235974
申请日：2016-08-12
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Hugo Gicquel , Chee Weng Cheong
IPC分类号： G06F3/041 , G06F3/044
CPC分类号： G06F3/0418 , G06F3/044 , G06F2203/04108
摘要： A circuit described herein includes a charge to voltage converter circuit having an input coupled to receive a sense signal from a sense node associated with a mutual capacitance to be sensed, and an output. A reset switch is coupled between the output of the charge to voltage converter circuit and the input of the charge to voltage converter. An accumulator circuit is configured to accumulate voltages at the output of the charge to voltage converter circuit and to generate an accumulator output signal. Control circuitry is configured to generate control signals for the reset switch and accumulator circuit so as to reduce noise in the accumulator output signal.

10. 发明授权

US09772696B2 System and method for phase error compensation in synchronized devices 有权
公开(公告)号：US09772696B2
公开(公告)日：2017-09-26
申请号：US14199510
申请日：2014-03-06
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD
发明人： Leonard Liviu Dinu , Chee Weng Cheong
IPC分类号： H04L7/00 , H04L25/00 , H04L25/40 , G06F3/0354 , G06F3/041 , H03L7/00
CPC分类号： G06F3/03545 , G06F3/041 , G06F3/0416 , G06F3/044 , G06F2203/0384 , H03L7/00
摘要： A system and method for compensating for detected phase errors during communications between synchronized devices. In an embodiment, the two devices may be a touch screen device and a synchronized stylus device. To this end, the touch screen device includes a controller configured to receive data signals from the stylus at specific time intervals. The touch screen device generates an internal control signal for receiving the incoming data signals at an expected frequency. The touch screen device further includes circuitry for measuring differences in the time a data signal is actually received against when the data signal was expected to be received and determines a time difference (e.g., a phase error). Then, the internal control signal may be adjusted to compensate for the accumulated phase error. Such a measurement and compensation helps ensure that communications remain in synchronization without having to reestablish synchronization through a cumbersome synchronization process.

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