公开(公告)号：US20180101264A1

公开(公告)日：2018-04-12

申请号：US15838675

申请日：2017-12-12

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng Cheong ,  Dianbo Guo ,  Kien Beng Tan ,  Yannick Guedon

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/041 ,  G06F3/0418

Abstract: 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.

公开(公告)号：US20180074619A1

公开(公告)日：2018-03-15

申请号：US15813906

申请日：2017-11-15

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Liviu Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/044 ,  G06F3/0354 ,  G06F3/041 ,  G06F3/038

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: 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.

公开(公告)号：US09846665B2

公开(公告)日：2017-12-19

申请号：US14534091

申请日：2014-11-05

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chaochao Zhang ,  Chee Weng Cheong ,  Dianbo Guo

IPC: G06F13/364 ,  G06F5/06 ,  G06F13/42

CPC classification number: G06F13/364 ,  G06F5/065 ,  G06F13/4282 ,  G06F2205/067

Abstract: A master-slave circuit is disclosed that maintains synchronization between two integrated circuit chips, using minimal chip resources. In one embodiment, a single, bidirectional communication path is shared by the two chips. Meanwhile, only one I/O port on each chip is used to send and receive signals via the bidirectional communication path. The first chip to detect a signal event is designated the master and controls the bidirectional communication path. The master can communicate the status to the other chip by controlling the logic state of the I/O ports. When the second chip detects that the I/O port is controlled by the first chip, the second chip will logically deduce that it is now the slave. If both chips detect the signal event at substantially the same time, one of the two chips is pre-programmed to assume control of the I/O port as the master.

公开(公告)号：US09671910B2

公开(公告)日：2017-06-06

申请号：US14522098

申请日：2014-10-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Leonard Dinu ,  Chao Chao Zhang ,  Dianbo Guo ,  Chee Weng Cheong ,  Eng Jye Ng

IPC: G06F3/038 ,  G06F3/0354 ,  G06F3/041 ,  G06F3/044

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/038 ,  G06F3/0416 ,  G06F2203/04104 ,  G06F2203/04106

Abstract: An electronic device may include a first controller associated with some channels of a digitizer having channels configured to receive a signal from a stylus, and with each channel having a direction. A second controller may be associated with channels of the digitizer not associated with the first controller. The first controller may scan for the signal at each channel associated with the first controller, and based on acquisition of the signal at a given channel associated with the first controller, calculate a property of the signal. The first controller may send the calculated property and the direction of the given channel to the second controller. The first controller and the second controller may scan for the signal at each channel having the direction of the given channel, at acquisition intervals based upon the calculated property.

公开(公告)号：US09523994B2

公开(公告)日：2016-12-20

申请号：US14201590

申请日：2014-03-07

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： CheeWeng Cheong ,  Kien Beng Tan ,  Dianbo Guo

IPC: G05F3/26 ,  G05F3/16

CPC classification number: G05F3/16 ,  G05F3/262

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20160124541A1

公开(公告)日：2016-05-05

申请号：US14531631

申请日：2014-11-03

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng Cheong ,  Dianbo Guo ,  Kien Beng Tan ,  Yannick Guedon

IPC: G06F3/044 ,  G09G5/18

CPC classification number: G06F3/044 ,  G06F3/041 ,  G06F3/0418

Abstract: 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.

Abstract translation: 电容放电电路包括具有电容的线路，包括电容器的开关电容器电路，耦合到线路的开关电路以及耦合在开关电容器电路和开关电路之间的电压调节器。 控制器将开关电容器电路和开关电路在第一相中进行操作，通过在公共模式和电源之间耦合电容器对电容器进行充电，而在第二阶段，通过将电压调节器与 电源节点之间的电容器接地。 控制器还被配置为在第三阶段中，通过在公共模式和电源之间耦合电容器来对电容器进行充电，并且在第四阶段中，通过将电压调节器和电容器之间的耦合来在线路和电容器之间共享电荷 线与地之间的系列。

公开(公告)号：US20160117047A1

公开(公告)日：2016-04-28

申请号：US14522098

申请日：2014-10-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Leonard Dinu ,  Chao Chao Zhang ,  Dianbo Guo ,  Chee Weng Cheong ,  Eng Jye Ng

IPC: G06F3/041 ,  G06F3/038 ,  G06F3/044 ,  G06F3/0354

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/038 ,  G06F3/0416 ,  G06F2203/04104 ,  G06F2203/04106

Abstract: An electronic device may include a first controller associated with some channels of a digitizer having channels configured to receive a signal from a stylus, and with each channel having a direction. A second controller may be associated with channels of the digitizer not associated with the first controller. The first controller may scan for the signal at each channel associated with the first controller, and based on acquisition of the signal at a given channel associated with the first controller, calculate a property of the signal. The first controller may send the calculated property and the direction of the given channel to the second controller. The first controller and the second controller may scan for the signal at each channel having the direction of the given channel, at acquisition intervals based upon the calculated property.

Abstract translation: 电子设备可以包括与数字转换器的一些通道相关联的第一控制器，其具有被配置为从触控笔接收信号的通道，并且每个通道具有方向。 第二控制器可以与不与第一控制器相关联的数字转换器的通道相关联。 第一控制器可以扫描与第一控制器相关联的每个信道处的信号，并且基于在与第一控制器相关联的给定信道处获取信号，计算信号的属性。 第一控制器可以将计算的属性和给定信道的方向发送到第二控制器。 第一控制器和第二控制器可以基于计算的属性以采集间隔扫描具有给定信道的方向的每个信道处的信号。

公开(公告)号：US09268432B2

公开(公告)日：2016-02-23

申请号：US13656302

申请日：2012-10-19

Applicant: STMicroelectronics Asia Pacific PTE LTD.

Inventor： Dianbo Guo ,  KienBeng Tan

IPC: G06F3/041

CPC classification number: G06F3/0416

Abstract: In accordance with an embodiment, a method of operating a touch panel includes operating a slave touch panel controller by receiving a synchronization signal from a master touch panel controller of a display driver circuit, and polling a plurality of receive inputs coupled to outputs of an in-cell touch module based on an predetermined pattern.

Abstract translation: 根据实施例，一种操作触摸面板的方法包括通过从显示驱动器电路的主触摸面板控制器接收同步信号来操作从触摸面板控制器，并且轮询多个接收输入的接收输入 基于预定图案的单元触摸模块。

公开(公告)号：US20150286297A1

公开(公告)日：2015-10-08

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: G06F3/0354 ,  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.

Abstract translation: 提供了一种具有触摸屏面板的触摸屏设备和用于操作触摸屏设备的方法。 该方法包括在噪声监测阶段期间监测第一组通道的通道信号和触摸屏面板的第二组通道，响应于大于触针阈值的通道信号检测触针信号，并小于一个 手掌阈值，当在第一组信道的至少一个信道上检测到触笔信号时选择第一组信道，并且在第二组信道上未检测到第一组信道，并且当检测到触笔信号时选择第二组信道 在第二组信道的至少一个信道上，并且在第一组信道上未检测到。