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Touch scanning circuit and driving method thereof, touch driving circuit and touch panel

  • US 10,067,588 B2
  • Filed: 11/25/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 01/12/2016
  • Status: Active Grant
First Claim
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1. A touch scanning circuit, comprising:

  • an input sub-circuit, a first control sub-circuit, a second control sub-circuit, a shift output sub-circuit and a touch output sub-circuit, wherein;

    a first end of the input sub-circuit is connected with a shift input signal end, a second end is connected with a first reference signal end, a third end is connected with a second reference signal end, a fourth end is connected with a first node, and a fifth end is connected with a second node;

    the input sub-circuit is configured to provide a signal of the first reference signal end to the first node under control of the shift input signal end, and provide a signal of the second reference signal end to the first node under control of the second node;

    a first end of the first control sub-circuit is connected with the first node, a second end is connected with a first clock signal end, a third end is connected with a third node, and a fourth end is connected with a shift output end;

    the first control sub-circuit is configured to allow the first node and the third node to be in a connecting state under control of the first clock signal end, and allow a voltage difference between the first node and the shift output end to be kept stable when the first node is in a floating state;

    a first end of the second control sub-circuit is connected with the second node, a second end is connected with the shift input signal end, a third end is connected with the first clock signal end, and a fourth end is connected with the second reference signal end;

    the second control sub-circuit is configured to provide the signal of the second reference signal end to the second node under control of the shift input signal end, and provide a signal of the first clock signal end to the second node under control of the first clock signal end;

    a first end of the shift output sub-circuit is connected with the third node, a second end is connected with a second clock signal end, a third end is connected with the second node, a fourth end is connected with the second reference signal end, and a fifth end is connected with the shift output end;

    the shift output sub-circuit is configured to allow a voltage difference between the third node and the shift output end to be kept stable when the third node is in the floating state, provide a signal of the second clock signal end to the shift output end under control of the third node, and provide the signal of the second reference signal end to the shift output end under control of the second node;

    a first end of the touch output sub-circuit is connected with the shift output end, a second end is connected with a touch input signal end, a third end is connected with the second node, a fourth end is connected with a common signal end, a fifth end is connected with the first clock signal end, and a sixth end is connected with a touch output end; and

    the touch output sub-circuit is configured to provide a signal of the touch input signal end to the touch output end under control of the shift output end, and provide a signal of the common signal end to the touch output end under control of at least one of the second node or the first clock signal end.

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