Position detecting device and position detecting method
First Claim
1. A position detecting device comprising:
- a sensor in which a plurality of electrodes is disposed in at least a first direction;
a differential amplifier circuit that includes a first input terminal and a second input terminal and that outputs a differential signal based on signals supplied to the first input terminal and the second input terminal; and
an electrode selection circuit that selects electrodes for connection to the first input terminal and the second input terminal of the differential amplifier circuit from the plurality of electrodes disposed in the sensor,wherein a position indicated by a stylus pen that generates an electric field based on electric field coupling between the stylus pen and the sensor is detected based on the differential signal output from the differential amplifier circuit, andwherein if the differential signal output from the differential amplifier circuit corresponding to a first electrode selection pattern set by the electrode selection circuit satisfies a set predetermined condition, a second electrode selection pattern different from the first electrode selection pattern is set by the electrode selection circuit to detect the position indicated by the stylus pen,wherein whether or not the set predetermined condition is satisfied is determined based on the differential signal that is generated corresponding to a height of the stylus pen in a height direction relative to a sensor surface of the sensor and is output from the differential amplifier circuit.
1 Assignment
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Accused Products
Abstract
A position detecting device includes a sensor having electrodes that receive an alternating current (AC) signal from a capacitive stylus pen that transmits the AC signal. The position detecting device detects a position indicated by the stylus pen on the sensor. The position detecting device also includes: an electrode selection circuit that selects electrodes provided in the sensor for connection to a positive terminal and a negative terminal; a differential amplifier that amplifies and outputs a signal indicating a difference between signals generated at the positive terminal and the negative terminal; a height detector that obtains a height of the stylus pen relative to a sensor surface of the sensor; and a control unit that causes a selection pattern of the electrodes selected for connection to the positive terminal and the negative terminal by the electrode selection circuit to change according to the height obtained by the height detector.
20 Citations
14 Claims
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1. A position detecting device comprising:
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a sensor in which a plurality of electrodes is disposed in at least a first direction; a differential amplifier circuit that includes a first input terminal and a second input terminal and that outputs a differential signal based on signals supplied to the first input terminal and the second input terminal; and an electrode selection circuit that selects electrodes for connection to the first input terminal and the second input terminal of the differential amplifier circuit from the plurality of electrodes disposed in the sensor, wherein a position indicated by a stylus pen that generates an electric field based on electric field coupling between the stylus pen and the sensor is detected based on the differential signal output from the differential amplifier circuit, and wherein if the differential signal output from the differential amplifier circuit corresponding to a first electrode selection pattern set by the electrode selection circuit satisfies a set predetermined condition, a second electrode selection pattern different from the first electrode selection pattern is set by the electrode selection circuit to detect the position indicated by the stylus pen, wherein whether or not the set predetermined condition is satisfied is determined based on the differential signal that is generated corresponding to a height of the stylus pen in a height direction relative to a sensor surface of the sensor and is output from the differential amplifier circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A position detecting device comprising:
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a sensor in which a plurality of electrodes is disposed in at least a first direction; a differential amplifier circuit that includes a first input terminal and a second input terminal and that outputs a differential signal based on signals supplied to the first input terminal and the second input terminal; and an electrode selection circuit that selects electrodes for connection to the first input terminal and the second input terminal of the differential amplifier circuit from the plurality of electrodes disposed in the sensor, wherein a position indicated by a stylus pen that generates an electric field based on electric field couple between the stylus pen and the sensor is detected based on the differential signal output from the differential amplifier circuit, and wherein if the differential signal output from the differential amplifier circuit corresponding to a first electrode selection pattern set by the electrode selection circuit satisfies a set predetermined condition, a second electrode selection pattern different from the first electrode selection pattern is set by the electrode selection circuit to detect the position indicated by the stylus pen, wherein the first electrode selection pattern is a pattern formed by selecting a first predetermined number of electrodes in the sensor for connection to the first input terminal of the differential amplifier circuit and selecting a second predetermined number of electrodes in the sensor for connection to the second input terminal of the differential amplifier circuit. - View Dependent Claims (10)
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11. A position detecting method of a position detecting device including a sensor in which a plurality of electrodes is disposed in at least a first direction, a differential amplifier circuit that includes a first input terminal and a second input terminal and that outputs a differential signal based on signals supplied to the first input terminal and the second input terminal, and an electrode selection circuit that selects electrodes for connection to the first input terminal and the second input terminal of the differential amplifier circuit from the plurality of electrodes disposed in the sensor, the position detecting device detecting a position indicated by a stylus pen that generates an electric field based on electric field coupling between the stylus pen and the sensor based on the differential signal output from the differential amplifier circuit, the position detecting method comprising:
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selecting a first electrode to connect to the first input terminal of the differential amplifier circuit; and selecting a second electrode different from the first electrode to connect to the second input terminal of the differential amplifier circuit, wherein a distance between the first electrode and the second electrode is changed based on the differential signal output from the differential amplifier circuit. - View Dependent Claims (12, 13, 14)
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Specification