Wacom Co., Ltd.

Jui Min Liu

Shigeyuki Sano

Yuhi Hatano

Yoshio Nomura

Thilo Naoki Hornung

Kazuhiro Miyoshi

Chin-Chuan Chou

Chengliang Hsieh

Masafumi Utsugi

A touch detecting method includes determining a size of a first touch surface area in which each of first capacitances exceeds a first threshold value, and determining that a detected indicator is a stylus or a finger based on a size of the first touch surface area. In response to determining that the detected indicator is the stylus, obtaining second capacitances by processing the first capacitances, and deriving coordinates indicating a stylus position based on a second touch surface area in which each of the second capacitances exceeds a second threshold value larger than the first threshold value. In response to determining that the detected indicator is the finger, deriving coordinates indicating a finger position based on a third touch surface area in which in which each of the first capacitances exceeds a third threshold value larger than the first threshold value.

Touch detecting method and touch detecting device

A position detection circuit for detecting, by using a touch sensor, a position indicated by a passive pointer to a touch surface disposed on the touch sensor. The position detection circuit includes a detection circuit that detects a touch of the passive pointer to the touch surface, a calculation circuit that calculates a total value of capacitance values in a calculation region surrounding at least part of a touch region indicating a region of the touch, and an output circuit that outputs an indicated position that is indicated by the touch, based on the total value of the capacitance values. The output circuit outputs the indicated position when the total value is equal to or less than a threshold value, and does not output the indicated position or invalidates the indicated position and outputs the indicated position that has been invalidated, when the total value exceeds the threshold value.

Position detection circuit, position detection method, and position

A touch detecting method includes determining a kind of a detected indicator based on a first area on a touch surface, obtaining a plurality of second capacitances formed by emphasizing a peak in comparison with a plurality of first capacitances by processing the plurality of first capacitances by a first filter in a case where the determining determines that the detected indicator is a stylus, deriving coordinates indicating a position of the stylus on the touch surface based on a second area on the touch surface, and deriving coordinates indicating a position of a finger on the touch surface based on a third area on the touch surface.

An interface device includes an on-panel pad and a sensor controller. The interface device is used to perform an input to an electronic device in response to an operation by a user on a capacitive touch panel display of the electronic device. The on-panel pad causes sensor electrodes included in the touch panel display to generate a two-dimensional pattern of capacitance while the on-panel pad is on the touch panel display. When the two-dimensional pattern generated while the on-panel pad is on the touch panel display has been detected, the sensor controller generates or outputs data including operation information in response to a change in capacitance in a region that is associated with the two-dimensional pattern and that receives an operation of the on-panel pad, the operation information indicating an operation state of the on-panel pad.

Interface device and on-panel pad

A coordinate detection method includes detecting coordinates corresponding to a position of a pen tip electrode of a pen by detecting distribution of signal levels in a plane of a touch surface through use of a plurality of linear electrodes disposed in the plane of the touch surface; detecting tilt data indicating a tilt of the pen; and acquiring a correction amount corresponding to a combination of the coordinates and the tilt data by referencing a correction table defining a correspondence between correction amounts and combinations of coordinates and tilt data.

Growing community of inventors

Saitama, Japan

Jui Min Liu