Shift registering unit, shift register and display device

Abstract

The invention provides a shift registering unit which comprises a first driving signal input end, a first driving signal output end, a first clock signal input end, a first pull-up transistor, a first output pull-down transistor, a switch transistor, a reset transistor and a bootstrapping capacitor. The shift registering unit further comprises a pull-down unit, wherein a first end of the pull-down unit is connected with the grid electrode of the switch transistor, a second end of the pull-down unit is connected with the grid electrode of the reset transistor, and a third end of the pull-down unit is connected with the grid electrode of first output pull-down transistor. The source electrode of the reset transistor is connected with a second low-level input end, and the source electrode of the first output pull-down transistor is connected with a third low-level input end. The invention further provides a shift register comprising the shift registering unit, a grid driver comprising the shift register, and a display device comprising the grid driver. A depletion mode transistor can be used in the shift registering unit.

Description

technical field [0001] The present invention relates to the display field, in particular to a shift register unit, a shift register including the shift register unit, and a display device including the shift register. Background technique [0002] With the development of flat panel display, high resolution and narrow bezel have become the trend of development, and integrating gate drive circuits on the display panel is the most important solution to realize high resolution and narrow bezel display. [0003] figure 1 Shown in is the circuit diagram of the existing basic shift register unit, such as figure 1 As shown, the basic shift register unit includes a pull-up transistor T100, an output pull-down transistor T200, a bootstrap capacitor C1, a pull-up control transistor T300, a pull-down control transistor T400, a first clock signal input terminal CLK, a pull-down unit 13, a drive Signal input terminal OUT(n-1) and drive signal output terminal OUT(n). [0004] exist fig...

AI Technical Summary

Problems solved by technology

However, oxide thin film transistors have depletion-type characteristics, such as figure 2 As shown by the dotted line in the middle, the oxide thin film transistor as a depletion mode thin film transistor is directly applied to figure 1 does not work properly when the circuit shown in

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