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Touch sensor, display and electronic device using a timing control signal

  • US 9,927,925 B2
  • Filed: 05/26/2010
  • Issued: 03/27/2018
  • Est. Priority Date: 05/29/2009
  • Status: Active Grant
First Claim
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1. A touch sensor apparatus, comprising:

  • a first signal source generating a first drive signal;

    a first drive electrode receiving the first drive signal as a display drive signal doubling as a touch sensor drive signal from the first signal source;

    a first detection electrode located adjacent to the first drive electrode;

    a dielectric material located between the first drive electrode and the first detection electrode defining a first capacitive area, wherein the first detection electrode generates a first output signal driven by the first drive signal;

    a detection circuit electrically connected to the first detection electrode, the detection circuit sensing the first output signal, the detection circuit including;

    a detection signal line connected to the first detection electrode;

    an amplification section that amplifies the first output signal;

    a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and

    a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal;

    a plurality of pixel electrodes formed on a first substrate;

    a second substrate opposing the first substrate; and

    a liquid crystal layer arranged between the first substrate and the second substrate,wherein the first detection electrode is formed between the second substrate and a polarizing plate,wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of the first drive signal, and the timing immediately before the first drive signal is supplied to the first drive electrode or synchronized with the timing immediately before the first drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the first detection electrode to a ground voltage when the switch element is turned on, the switch element allows the first detection electrode to float when the switch element is turned off, andwherein the detection circuit determines a first detection result by comparing the first output signal to a signal threshold, the first detection result indicative of whether the first capacitive area was in a touch state.

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