Shift register, driving method thereof, scanning driving circuit and display device

Abstract

The embodiment of the invention provides a shift register, a driving method thereof, a scanning driving circuit and a display device, and relates to the technical field of display. The shift registerprovided by the embodiment of the invention comprises a first node control module, a second node control module and an output control module; the first node control module is used for controlling thelevel of a first node according to an input signal, a first clock signal and a second clock signal; the second node control module is used for controlling the level of a second node according to the first clock signal, the second clock signal, a low level signal and a high level signal; and the output control module is used for enabling the output end to output the high level or the low level according to the level of the first node, the level of the second node and the second clock signal. According to the technical scheme, the competition risk of the shift register can be avoided, and normaloutput of the output end is guaranteed.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a shift register, a driving method thereof, a scan driving circuit and a display device. Background technique [0002] With the vigorous development of flat panel display technology, organic light emitting display devices (Organic Light Emitting Display, OLED for short) are more and more widely used due to their excellent characteristics such as self-illumination, high brightness, wide viewing angle, and fast response. [0003] In order to drive the organic light-emitting device in the organic light-emitting display device to emit light, the organic light-emitting display panel includes a scan driving circuit, and the scan driving circuit includes a multi-stage cascaded shift register. The circuit structure of the shift register and the corresponding working sequence are as follows: figure 1 and figure 2 as shown, figure 1 The circuit structure diagram of the shift register p...

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Problems solved by technology

[0004] The inventors found that when the shift register has figure 1 and figure 2 When the circuit structure and working sequence are shown, when the output terminal OUT outputs a low level, the output terminal OUT will feed back to the control terminal of the transistor M3, so that the transistor M3 is turned on, and the high-level signal VGH is written into the node N1, so that the node N1 N1 is at a high level, thereby turning off transistor M5; if in the next stage, node N1 is not written high in time, there is a risk of contention in the shift register, resulting in an error in the output at the output terminal

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