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.

公开(公告)号：US10120509B2

公开(公告)日：2018-11-06

申请号：US14982349

申请日：2015-12-29

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Praveesh Chandran ,  Lokesh Kumar Korapati ,  Mythreyi Nagarajan

IPC: G06F3/044 ,  G06F3/041 ,  G06F11/00

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：US10088965B2

公开(公告)日：2018-10-02

申请号：US15381489

申请日：2016-12-16

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Baranidharan Karuppusamy ,  Chaochao Zhang ,  Kusuma Adi Ningrat

IPC: G06F3/044 ,  G06F3/041

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.

公开(公告)号：US20180232071A1

公开(公告)日：2018-08-16

申请号：US15953017

申请日：2018-04-13

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng CHEONG ,  Leonard Liviu DINU ,  Dianbo GUO ,  Kien Beng TAN

IPC: G06F3/0354 ,  G06F3/041 ,  G06F3/038 ,  H04L27/00

CPC classification number: G06F3/03545 ,  G06F3/038 ,  G06F3/041 ,  G06F3/0416 ,  G06F2203/0384 ,  H04L2027/0097

Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals. Further, the detection window duration and start times may be adjusted based on previously detected (or undetected) synchronization signals in order to compensate for noise overshadowing synchronization signals.

公开(公告)号：US20180188878A1

公开(公告)日：2018-07-05

申请号：US15397340

申请日：2017-01-03

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418

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：US20180173357A1

公开(公告)日：2018-06-21

申请号：US15384494

申请日：2016-12-20

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Dylan Park ,  John Serge Georges Nankoo

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0416 ,  G06F3/044 ,  G06F2203/04101 ,  G06F2203/04111

Abstract: The present disclosure provides a capacitive sensing structure for detecting a force touch in a touchscreen application. Performance uniformity of the force touch sensor is improved by providing a capacitive force touch structure having dot-pattern sensing electrodes of varying thickness, wherein the variation in electrode thickness corresponds to a relative displacement potential of portions of the sensing electrode. This variation in thickness improves performance uniformity of the force sensor by compensating for the displacement potential (i.e., flexibility) of the sensing electrodes so that a force touch applied to the touch surface is measured consistently regardless of the location of the force touch on the touch surface.

公开(公告)号：US20180173336A1

公开(公告)日：2018-06-21

申请号：US15381489

申请日：2016-12-16

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.