公开(公告)号：US20200153399A1

公开(公告)日：2020-05-14

申请号：US16184778

申请日：2018-11-08

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Supriya Raveendra HEGDE ,  Hugo GICQUEL

IPC: H03F3/45

Abstract: A feedback stage for an integrator circuit is provided. The integrator receives a first input current and a second input current that include respective measurement current components and an offset current component. The integrator integrates the first input current and the second input current and generates a first output voltage and a second output voltage. The feedback stage including a transconductance amplifier detects a difference between the first output voltage and the second output voltage and sinks or sources a first output current and a second output current based on the difference between the first output voltage and the second output voltage. The first output current is additively combined with the first input current and the second output current is additively combined with the second input current to mitigate the offset current component at an input of the integrator.

公开(公告)号：US10599276B2

公开(公告)日：2020-03-24

申请号：US16162925

申请日：2018-10-17

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Praveesh Chandran ,  Lokesh Kumar Korapati ,  Mythreyi Nagarajan

IPC: G06F3/044 ,  G06F3/041

Abstract: The present disclosure is directed to a system and method to remove common mode noise projected onto a touch sensor array from a display. The system is configured to activate two rows of electrodes at the same time, while coupling remaining rows of electrodes to ground. A first one of the two activated rows is used for detection of a touch and a second one of the two activated rows is used to detect common mode noise from the display. The common mode noise detected by the second row is removed from signals received from a plurality of columns of the touch sensor array.

公开(公告)号：US10540040B2

公开(公告)日：2020-01-21

申请号：US15199332

申请日：2016-06-30

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Yannick Guedon

IPC: G06F3/041 ,  G06F1/32 ,  G06F3/044 ,  G06F1/16 ,  G06F1/3234

Abstract: Dual power supply and energy recovery techniques are used in a capacitive touch panel that employs a concurrent drive scheme. A dual supply output buffer boosts a capacitor from an intermediate voltage level to a high voltage level. Energy recovery exchanges stored energy between a capacitor and an inductor. When both techniques are used together, power consumption of a capacitive touch panel drive circuit can be reduced dramatically, by as much as about 80%. Such high efficiency touch panels have wide application to ultra-thin touch screens, including those suitable for use in mobile devices and flexible displays.

公开(公告)号：US10534489B2

公开(公告)日：2020-01-14

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

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：US10481731B2

公开(公告)日：2019-11-19

申请号：US15386291

申请日：2016-12-21

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Leonard Liviu Dinu ,  Hugo Gicquel

IPC: G06F3/041 ,  G06F3/044

Abstract: Disclosed herein is an electronic device including a sensing layer including a plurality of sense lines, and a plurality of single ended charge converter circuits each receiving input from a corresponding one of the plurality of sense lines. The electronic device also includes a plurality of current mirror circuits, each respectively mirroring output from one of the plurality of single ended charge converter circuits so as to produce two substantially identical outputs for each of the plurality of single ended charge converter circuits. There may be a plurality of subtractor circuits coupled to the plurality of current mirror circuits, with each of the plurality of subtractor circuits configured to output a voltage that is a function of a difference between outputs from two of the plurality of current mirror circuits associated with adjacent ones of the sense lines.

公开(公告)号：US20190220142A1

公开(公告)日：2019-07-18

申请号：US15873973

申请日：2018-01-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Kusuma Adi Ningrat ,  Ade Putra

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/0414 ,  G06F3/044

Abstract: Disclosed herein is a touch screen controller operable with a touch screen having force lines and sense lines. The touch screen controller includes drive circuitry driving the force lines with a force signal in a touch data sensing mode and not driving the force lines in a noise sensing mode. Sense circuitry senses data at the sense lines in the touch data sensing mode and the noise sensing mode. Processing circuitry samples the data, multiplies the data by a sine multiplier to produce imaginary data, sums the imaginary data, multiplies the data by a cosine multiplier to produce real data, sums the real data, and determines magnitude values of the data as a function of the imaginary data and the real data.

公开(公告)号：US10303299B2

公开(公告)日：2019-05-28

申请号：US15397340

申请日：2017-01-03

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041

Abstract: Disclosed herein is a touch screen controller operable with a touch screen. The touch screen controller includes input circuitry configured to receive touch data from the touch screen, and processing circuitry. The processing circuitry is configured to identify an island in the touch data, determine whether a horizontal groove is present in the island, determine whether a vertical groove is present in the island, and determine whether a diagonal groove is present in the island. The processing circuitry determines the island to indicate a single elongated touch where a diagonal groove is present in the island but horizontal and vertical grooves are not present in the island.

公开(公告)号：US20190121488A1

公开(公告)日：2019-04-25

申请号：US16223428

申请日：2018-12-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh CHANDRAN ,  Manivannan PONNARASU ,  Mythreyi NAGARAJAN

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

Abstract: A touch screen controller identifies an island in a matrix of acquired touch data values. A first sharpness of the island is calculated and a second sharpness of the island is calculated if the calculated first sharpness is greater than a sharpness threshold. A dynamic strength threshold is then determined as a function of the second sharpness if a variance of the island is greater than a dynamic variance threshold. A determination is then made that the identified island is a valid stylus island if a peak strength of the island is greater than the dynamic strength threshold.

公开(公告)号：US10185454B2

公开(公告)日：2019-01-22

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 ,  G06F3/038 ,  G06F3/041

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：US20180373364A1

公开(公告)日：2018-12-27

申请号：US16117277

申请日：2018-08-30

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Baranidharan Karuppusamy ,  Chaochao Zhang ,  Kusuma Adi Ningrat

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0418

Abstract: Disclosed herein is a touch screen controller for controlling touch sensing in a touch screen display, the touch screen display having a display layer controlled as a function of horizontal sync and vertical sync signals and a capacitive touch array comprised of drive lines and sense lines. The touch screen controller includes a driver and control circuitry. The control circuitry is configured to cause the driver to generate a driving signal on the drive lines during assertion of the horizontal sync signal, and cause the driver to generate the driving signal on the drive lines during assertion of the vertical sync signal. Analog touch sensing circuitry is configured to generate analog touch data as a function of signals on the sense lines resulting from generation of the drive signal on the drive lines.