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：US20170031493A1

公开(公告)日：2017-02-02

申请号：US14811884

申请日：2015-07-29

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu ,  Leo Lee

IPC: G06F3/041

CPC classification number: G06F3/0416 ,  G06F3/0418

Abstract: An electronic device includes a processor that acquires touch data values corresponding to different locations of a touch display, and identifies an island in the touch data that has touch data values acquired from adjacent locations of the touch display that indicate a potential touch. A first area of the island is determined from touch data values that exceed a first threshold value, and a second area of the island is determined from touch data values that exceed a second threshold value. If the first area is less than a multiple of the second area, coordinates of a location of the island are determined from the touch data values indicating the potential touch. If the first area is at least the multiple of the second area, coordinates of a location of the island are determined from the touch data values indicating the potential touch that exceed a third threshold value.

Abstract translation: 电子设备包括获取与触摸显示器的不同位置相对应的触摸数据值的处理器，并且识别触摸数据中具有从指示潜在触摸的触摸显示器的相邻位置获取的触摸数据值的岛。 从超过第一阈值的触摸数据值确定岛的第一区域，并且从超过第二阈值的触摸数据值确定岛的第二区域。 如果第一区域小于第二区域的倍数，则从指示潜在触摸的触摸数据值确定岛的位置的坐标。 如果第一区域是至少第二区域的倍数，则从指示超过第三阈值的潜在触摸的触摸数据值确定岛的位置的坐标。

公开(公告)号：US10481723B2

公开(公告)日：2019-11-19

申请号：US15337167

申请日：2016-10-28

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041

Abstract: Disclosed herein is a touch screen controller that calculates a variance of an island in acquired touch data values. Where the variance exceeds a variance threshold, the island is validated as a representing touch. Where the variance does not exceed the variance threshold, whether the island represents a touch or a hover is determined by calculating a sharpness by applying weights to nodes of the island, where neighboring nodes adjacent to a peak node are weighted less than non-neighboring nodes not adjacent to the peak node. An island strength threshold is determined as a function of a product of the variance and the sharpness. It is determined that the island represents a touch where a highest touch data value of the island is greater than the island strength threshold, and a hover where the highest touch data value of the island is less than the island strength threshold.

公开(公告)号：US20190250731A1

公开(公告)日：2019-08-15

申请号：US15893207

申请日：2018-02-09

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu

IPC: G06F3/044 ,  G06F3/041

Abstract: Disclosed herein is a touch screen controller operable with a touch screen. The touch screen controller includes input circuitry to receive touch data from the touch screen, and processing circuitry. The processing circuitry acquires mutual capacitance touch strength values from the touch screen, determines when the mutual capacitance touch strength values define a pre-validated donut touch pattern, and reads self capacitance touch strength values for lines that are contained within bounds of the pre-validated donut touch pattern. If the self capacitance touch strength values for lines contained within bounds of the pre-validate donut touch pattern contain a singular peak value, the processing circuitry validates the pre-validated donut touch pattern as representing a single touch.

公开(公告)号：US10365764B2

公开(公告)日：2019-07-30

申请号：US15207105

申请日：2016-07-11

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Lokesh Kumar Korapati ,  Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041 ,  G06F3/044

Abstract: A method of foreign matter rejection for multi-touch capacitive touch screens includes performing touch detection in both self-capacitance mode and mutual capacitance mode. By combining information from both modes, a distinction is identified between wanted touches, such as by a finger or stylus, and unwanted touches such as by foreign matter.

公开(公告)号：US10175807B2

公开(公告)日：2019-01-08

申请号：US14974299

申请日：2015-12-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Manivannan Ponnarasu ,  Mythreyi Nagarajan

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

Abstract: An electronic device disclosed herein includes a touch screen controller to identify an island i.e., a matrix of acquired touch data values, the island including adjacent touch data values indicating a potential touch of a touch sensitive screen. A first sharpness of the island is calculated using a first normalization type and not a second normalization type. A second sharpness of the island is calculated using the first and second normalization types if the first sharpness is greater than the sharpness threshold. A dynamic variance threshold is determined as a function of the second sharpness. A dynamic strength threshold is determined as a function of the second sharpness if a variance of the island is greater than the dynamic variance threshold, and the island is determined to be a valid stylus island if the peak strength is greater than the dynamic strength threshold.

公开(公告)号：US20180210607A1

公开(公告)日：2018-07-26

申请号：US15412824

申请日：2017-01-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/044

Abstract: A touch screen controller includes input circuitry receiving touch data from a touch screen, and processing circuitry. The processing circuitry determines first coordinates of a touch at a first time, based upon the received touch data. A first threshold window is set about the first coordinates, with the first threshold window having a central point at the first coordinates, and a second threshold window is set about the first coordinates, with the second threshold window having a central point at the first coordinates and being larger than the first threshold window. Second coordinates of the touch are determined at a second time, based upon the received touch data, and where the second coordinates are not within the first threshold window but are within the second threshold window, the second coordinates are corrected based upon a distance between the second coordinates and the central point of the second threshold window.

公开(公告)号：US20180121010A1

公开(公告)日：2018-05-03

申请号：US15337167

申请日：2016-10-28

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Manivannan Ponnarasu ,  Mythreyi Nagarajan

IPC: G06F3/041 ,  G06F3/044

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

Abstract: Disclosed herein is a touch screen controller that calculates a variance of an island in acquired touch data values. Where the variance exceeds a variance threshold, the island is validated as a representing touch. Where the variance does not exceed the variance threshold, whether the island represents a touch or a hover is determined by calculating a sharpness by applying weights to nodes of the island, where neighboring nodes adjacent to a peak node are weighted less than non-neighboring nodes not adjacent to the peak node. An island strength threshold is determined as a function of a product of the variance and the sharpness. It is determined that the island represents a touch where a highest touch data value of the island is greater than the island strength threshold, and a hover where the highest touch data value of the island is less than the island strength threshold.