公开(公告)号：US10509508B2

公开(公告)日：2019-12-17

申请号：US15673358

申请日：2017-08-09

Applicant: Synaptics Incorporated

Inventor： Nobukazu Tanaka ,  Takayuki Noto ,  Tetsuo Tanemura

IPC: G06F3/041 ,  G06F3/044

Abstract: Provided is a touch sensing circuit configured to sense an approach of a conductive object toward a sensor capacitor through measuring a sensor response signal generated by the sensor capacitor in response to a sensing wave signal applied to the sensor capacitor. The touch sensing circuit is connectable to a conversion circuit and a touch detection circuit. The conversion circuit calculates a response signal vector for a frequency component of the sensing wave signal by converting the response signal into a frequency domain representation. The touch sensing circuit includes a baseline vector manager circuit holding a baseline vector and a vector subtraction circuit, and calculates a delta vector which is the vector difference between the baseline vector and the response signal vector received from the conversion circuit. The touch detection circuit detects an approach of a conductive object towards the sensor capacitor on the basis of the calculated delta vector.

公开(公告)号：US10352731B2

公开(公告)日：2019-07-16

申请号：US15467332

申请日：2017-03-23

Applicant: SYNAPTICS INCORPORATED

Inventor： Nobukazu Tanaka ,  Takayuki Noto ,  Tetsuo Tanemura

IPC: G01D5/24 ,  G01R27/26 ,  G06F3/041 ,  G06F3/044 ,  H03K17/955

Abstract: A touch sensing circuit operable to sense a conductor approaching a sensor capacitance by measuring a response signal obtained from the sensor capacitance according to an applied detection signal includes an A/D converter and a Fourier transform device. The A/D converter samples the response signal with a predetermined cycle, followed by conversion to a digital value and outputs as time-series response data. The Fourier transform device calculates, from the time-series response data, a result of transformation at a detection frequency representing the reciprocal of a cycle of the detection signal and outputs it. The touch sensing circuit converts the response signal to the frequency domain, calculates only components (harmonics or others as needed) of a frequency equal to that of the detection signal required for touch sensing, and supplies them for a touch coordinate calculation process in a subsequent stage.

公开(公告)号：US09898148B2

公开(公告)日：2018-02-20

申请号：US14723218

申请日：2015-05-27

Applicant: SYNAPTICS INCORPORATED

Inventor： Tetsuo Tanemura ,  Wei Lu ,  Shunsuke Araki

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416 ,  G06F3/0418 ,  G06F2203/04108

Abstract: This disclosure generally provides an input device with near-field and far-field receiver electrodes. Using resulting signals captured by these receivers, the input device generates a near-field capacitive image and a far-field capacitive image. In one embodiment, the near-field capacitive image contains information identifying a location of an input object in a first plane in free space, while the far-field capacitive image contains information identifying a location of the input object in a second plane in free space. Further, the first and second planes may be parallel planes where the first plane is closer to an input surface of the input device than the second plane. In one embodiment, the input device compares the information in the near-field and far-field images in order to determine a state of the input object.