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Electrostatic capacity type touch sensor

  • US 9,041,683 B2
  • Filed: 02/17/2011
  • Issued: 05/26/2015
  • Est. Priority Date: 02/18/2010
  • Status: Active Grant
First Claim
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1. An electrostatic capacity type touch sensor, comprising:

  • a touch sensor pad;

    a sensor line connected to the touch sensor pad;

    a charge amplifier having a first input connected to the sensor line and outputting an output voltage corresponding to a change of a capacitance at the touch sensor pad;

    a signal line disposed adjacent to the sensor line that connects a vibration motor associated with the touch sensor pad that indicates touch detection to a drive transistor that drives the signal line between a first potential and a second potential in correspondence with the output voltage of the charge amplifier, wherein the vibration motor is connected between the first potential and the signal line;

    a parasitic capacitor formed between the sensor line and the signal line; and

    a bias resistor connected in parallel with the vibration motor associated with the touch sensor pad that biases the signal line to a first potential so as to avoid floating of the signal line.

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