Shift register unit, driving method, gate driving circuit and display device

Abstract

The invention discloses a shift register unit, a driving method, a gate driving circuit and a display device, and belongs to the technical field of display. The shift register unit includes an input circuit, an output circuit, a reset circuit, a first pull-down control circuit, a second pull-down control circuit, and a pull-down circuit. The first pull-down control circuit can control the potential of a pull-down control node to be an inactive potential under the control of a first input signal, prevent the second pull-down control circuit from controlling the potential of the pull-down node to be an effective potential under the control of a pull-down control node, prevent the pull-down circuit from affecting the charging of a pull-up node under the control of the pull-down node, and improve the charging efficiency of the pull-up node, so that when the refresh rate of the display device is high, the input circuit can also effectively charge the pull-up node. Moreover, since the firstpull-down control circuit directly controls the potential of the pull-down control node, the efficiency of controlling the pull-down node to the inactive potential is improved, and the problem that the pull-down circuit affects the potential of the pull-up node is further avoided.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a shift register unit, a driving method, a gate driving circuit and a display device. Background technique [0002] The shift register usually includes a plurality of cascaded shift register units, and each shift register unit is used to drive a row of pixel units. The plurality of cascaded shift register units can realize the step-by-step shifting of each row of pixel units in the display device. Line scan driver to display images. [0003] In the related art, the shift register unit mainly includes: an input circuit, an output circuit, a reset circuit and a pull-down circuit. In the input stage, the input circuit can charge the pull-up node according to the signal output by the shift register unit of the upper stage. When the pull-up node is charged to a certain potential, the pull-up node can control the pull-down circuit to pull down the potential of the pull-down node, th...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a shift register unit, a driving method, a gate driving circuit and a display device, which can solve the problem in the related art that the output circuit cannot output signals normally due to insufficient charging of the pull-up node. The technical solution is as follows:

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