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1. 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.

2. 发明申请

US20150253799A1 TEMPERATURE INSENSITIVE TRANSIENT CURRENT SOURCE 有权
标题翻译：温度敏感瞬态电流源
公开(公告)号：US20150253799A1
公开(公告)日：2015-09-10
申请号：US14201590
申请日：2014-03-07
申请人： STMicroelectronics Asia Pacific Pte. Ltd.
发明人： CheeWeng Cheong , Kien Beng Tan , Dianbo Guo
IPC分类号： G05F3/16
CPC分类号： G05F3/16 , G05F3/262
摘要： A current source includes a first current path including a first current mirror transistor and an input current source coupled in series, a second current path including a second current minor transistor, wherein control terminals of the first and second current minor transistors are connected, a first circuit configured to provide a controlled auxiliary current in the second current path, and a second circuit configured to provide a controlled output current in the second current path when or after the auxiliary current has reached steady state. The current source may include one or more cascode transistors in the first current path and one or more cascode transistors in the second current path. The first circuit may be activated before the second circuit is activated.
摘要翻译：电流源包括包括串联耦合的第一电流镜晶体管和输入电流源的第一电流路径，包括第二电流次级晶体管的第二电流路径，其中连接第一和第二电流次级晶体管的控制端，第一电路，被配置为在第二电流路径中提供受控的辅助电流;以及第二电路，被配置为在辅助电流达到稳定状态时或之后提供第二电流路径中的受控输出电流。电流源可以包括第一电流路径中的一个或多个共源共栅晶体管和第二电流路径中的一个或多个共源共栅晶体管。第一电路可以在第二电路被激活之前被激活。

3. 发明申请

US20140312919A1 CONFIGURABLE ANALOG FRONT-END FOR MUTUAL CAPACITANCE SENSING AND SELF CAPACITANCE SENSING 有权
标题翻译：可配置模拟前端用于电容传感和自检电感
公开(公告)号：US20140312919A1
公开(公告)日：2014-10-23
申请号：US14322244
申请日：2014-07-02
申请人： STMICROELECTRONICS ASIA PACIFIC PTE LTD , STMICROELECTRONICS S.R.L.
发明人： Kien Beng Tan , Ernesto Lasalandra , Tommaso Ungaretti , Yannick Guedon , Dianbo Guo , Paolo Angelini , Giovanni Carlo Tripoli
IPC分类号： G01R27/26 , G06F3/044
CPC分类号： G01R27/2605 , G06F3/0416 , G06F3/044 , G06F2203/04104
摘要： Capacitance sensing circuits and methods are provided. A dual mode capacitance sensing circuit includes a capacitance-to-voltage converter having an amplifier and an integration capacitance coupled between an output and an inverting input of the amplifier, and a switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitive to voltage converter in a mutual capacitance sensing mode and responsive to self mode control signals for controlling signals supplied from the capacitive touch matrix to the capacitance-to-voltage converter in a self capacitance sensing mode, wherein the capacitance sensing circuit is configurable for operation in the mutual capacitance sensing mode or the self capacitance sensing mode.
摘要翻译：提供电容感测电路和方法。双模电容感测电路包括具有放大器和耦合在放大器的输出和反相输入端之间的积分电容的电容 - 电压转换器，以及响应于从模拟信号提供的控制信号的相互模式控制信号的开关电路电容式触摸矩阵到互电容感测模式中的电容到电压转换器，并且响应于用于在自电容感测模式中控制从电容式触摸矩阵提供给电容 - 电压转换器的信号的自模式控制信号，其中电容感测电路可配置为在互电容感测模式或自身电容感测模式下工作。

4. 发明授权

US10534489B2 Capacitive discharge circuit for touch sensitive screen 有权
公开(公告)号：US10534489B2
公开(公告)日：2020-01-14
申请号：US15838675
申请日：2017-12-12
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
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.

5. 发明授权

US10185454B2 System and method of communication between a capacitive touch screen and an active stylus 有权
公开(公告)号：US10185454B2
公开(公告)日：2019-01-22
申请号：US15813906
申请日：2017-11-15
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Baranidharan Karuppusamy , Giuseppe Noviello , Chee Weng Cheong , Leonard Liviu Dinu , Dianbo Guo , Kien Beng Tan , Chaochao Zhang
IPC分类号： G06F3/044 , G06F3/0354 , G06F3/038 , G06F3/041
摘要： An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

6. 发明授权

US09870113B2 Capacitive discharge circuit for touch sensitive screen 有权
公开(公告)号：US09870113B2
公开(公告)日：2018-01-16
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.

7. 发明授权

US09846520B2 System and method of communication between a capacitive touch screen and an active stylus 有权
公开(公告)号：US09846520B2
公开(公告)日：2017-12-19
申请号：US15616294
申请日：2017-06-07
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Baranidharan Karuppusamy , Giuseppe Noviello , Chee Weng Cheong , Leonard Dinu , Dianbo Guo , Kien Beng Tan , Chaochao Zhang
IPC分类号： G06F3/045 , G06F3/044 , G06F3/041 , G06F3/038 , G06F3/0354
CPC分类号： G06F3/044 , G06F3/03545 , G06F3/0383 , G06F3/0416
摘要： An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

8. 发明授权

US09772726B2 Capacitive discharge circuit for touch sensitive screen 有权
公开(公告)号：US09772726B2
公开(公告)日：2017-09-26
申请号：US14531631
申请日：2014-11-03
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.

9. 发明授权

US09703433B2 System and method of communication between a capacitive touch screen and an active stylus 有权
公开(公告)号：US09703433B2
公开(公告)日：2017-07-11
申请号：US14461977
申请日：2014-08-18
申请人： STMicroelectronics Asia Pacific Pte Ltd
发明人： Praveesh Chandran , Baranidharan Karuppusamy , Giuseppe Noviello , Chee Weng Cheong , Leonard Dinu , Dianbo Guo , Kien Beng Tan , Chaochao Zhang
IPC分类号： G06F3/045 , G06F3/044 , G06F3/0354 , G06F3/038 , G06F3/041
CPC分类号： G06F3/044 , G06F3/03545 , G06F3/0383 , G06F3/0416
摘要： An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

10. 发明授权

US09675368B2 Touch panel scanning method, circuit and system 有权
公开(公告)号：US09675368B2
公开(公告)日：2017-06-13
申请号：US14272455
申请日：2014-05-07
申请人： STMicroelectronics Asia Pacific PTE LTD
发明人： Dianbo Guo , Praveesh Chandran , Lokesh Kumar Korapati
IPC分类号： G06F3/041 , A61B17/22 , A61B18/24 , A61B18/26 , A61H23/00 , G06F3/044
CPC分类号： A61B17/22022 , A61B18/245 , A61B18/26 , A61B2017/22051 , A61B2017/22079 , A61H23/008 , G06F3/0416 , G06F3/044 , G06F2203/04108
摘要： A touch panel includes a plurality of drive lines, a plurality of orthogonal sense lines, and a plurality of sensors. A method of controlling the touch panel to detect touches includes simultaneously applying a drive signal to each of a group of drive lines of the touch panel. Each of the drive signals is applied to a corresponding drive line in the group during a time slot and all the applied drive signals having the same electrical characteristics over the time slot. The method includes sensing sense signals generated on the sense lines in response to the applied drive signals and processing the sense signals to detect touches of the touch panel.

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