scan drive circuit

Abstract

The invention discloses a scanning driving circuit, which includes several scanning driving units connected in sequence, each scanning driving unit includes a scanning signal output terminal, which outputs a high or low level scanning signal; a pull-up circuit controls the output of a high level scanning signal. signal; the downlink circuit, which outputs a high-level level transmission signal; the pull-up control circuit, which charges the pull-up control signal point to pull the potential up to a high level; the pull-down maintenance circuit, maintains the pull-up control signal point and The low level of the scanning signal; the bootstrap circuit increases the potential of the pull-up control signal point to prevent leakage, thereby preventing the negative threshold voltage from causing the scanning drive circuit to fail.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a scanning driving circuit. Background technique [0002] The GOA (Gate Driver on Array) technology is beneficial to the narrow frame design and cost reduction of the display screen, and has been widely used and researched. Indium Gallium Zinc Oxide (IGZO) has high mobility and good device stability, which can reduce the complexity of the scan drive circuit. Due to the high mobility of IGZO, the size of the thin film transistor in the scan drive circuit is relatively small, which is beneficial to The production of narrow-frame displays; secondly, due to the device stability of IGZO, the number of power supply and thin-film transistors used to stabilize the performance of thin-film transistors can be reduced, so that the circuit is simple and the power consumption is low. However, due to the characteristics of the IGZO material itself, the initial threshold voltage Vth tends to ...

AI Technical Summary

Problems solved by technology

Indium Gallium Zinc Oxide (IGZO) has high mobility and good device stability, which can reduce the complexity of the scan drive circuit. Due to the high mobility of IGZO, the size of the thin film transistor in the scan drive circuit is relatively small, which is beneficial to The production of narrow-frame displays; secondly, due to the device stability of IGZO, the number of power supply and thin-film transistors used to stabilize the performance of thin-film transistors can be reduced, so that the circuit is simple and the power consumption is low. However, due to the characteristics of the IGZO material itself, the initial threshold voltage Vth is easy to be negative, and the influence of light will cause serious negative drift of the threshold voltage Vth, which may cause the scanning drive circuit to fail

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