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Scanning driving circuit with pull-down maintain module and liquid crystal display apparatus with the scanning driving circuit

  • US 10,262,609 B2
  • Filed: 01/30/2016
  • Issued: 04/16/2019
  • Est. Priority Date: 10/31/2015
  • Status: Active Grant
First Claim
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1. A scanning driving circuit, the scanning driving circuit comprising a first driving circuit and a second driving circuit, the first driving circuit and the second driving circuit comprising a plurality of driving units in cascade connections, and each of the plurality of driving units in the first driving circuit and the second driving circuit comprising:

  • a forward and reverse scanning module to output a forward scanning signal, a reverse scanning signal and a pull-down signal;

    a pull-down maintain module connected to the forward and reverse scanning module and to receive the pull-down signal from the forward and reverse scanning module and output a pull down signal according to the pull-down signal;

    a control module connected to the forward and reverse scanning module and the pull-down maintain module, and to receive the forward scanning signal and the reverse scanning signal from the forward and reverse scanning module and the pull down signal from the pull-down maintain module then output a high electrical level or a low electrical level scanning driving signal, wherein the control module comprises a seventh to tenth controllable switches and a capacitor, an output terminal of the seventh controllable switch is directly connected to a control terminal of the tenth controllable switch and an output terminal of the tenth controllable switch is directly connected to the scanning line, directly connected to an output terminal of the ninth controllable switch and directly connected to a reset module;

    a scanning line to transmit the scanning driving signal to the pixel unit; and

    the reset module connected to the pull-down maintain module and the control module to reset the electrical potential of the scanning line;

    wherein the forward and reverse scanning module further comprises a first controllable switch, and the reset module further comprises an eleventh controllable switch;

    a control terminal of the first controllable switch in a first driving unit of the first driving circuit is directly connected to a first driving terminal, the control terminal of the first controllable switch in each of the rest of the driving units the first driving circuit is connected to an upper level scanning line, the control terminals of the eleventh controllable switches in all the driving units of the first driving circuit are directly connected to a second driving terminal;

    the control terminal of the first controllable switch in a first driving unit of the second driving circuit is directly connected to the second driving terminal;

    the control terminal of the first controllable switch in each of the rest of the driving units of the second driving circuit is connected to the upper level scanning line, the control terminals of the eleventh controllable switches in all the driving units of the second driving circuit are directly connected to the first driving terminal;

    when the first driving terminal input a high electrical level signal and the second driving terminal inputs a low electrical level signal, all the driving units of the first driving circuit are conducted, and all the driving units of the second driving circuit are reset;

    when the touch scanning is finished, the first driving terminal inputs a low electrical level signal and the second driving terminal inputs a high electrical level signal, all the driving units of the second driving circuit are conducted, and all the driving units of the first driving circuit are reset.

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