Shift Register Potential Stabilizing Circuit for Display Gate Driving
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Solution Overview
Problem
Conventional gate driving circuits face instability issues due to floating states in pulling-up nodes and outputting signal terminals, leading to potential leakage and noise, which affects the stability of scanning signals in display panels.
Innovation Solution
A shift register unit is designed with a potential stabilizing circuit that receives a controlling signal to provide a reference signal to both the pulling-up node and outputting signal terminal, maintaining stability during discharging and resetting periods, thereby preventing noise and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors control output by switching between pulling-up and pulling-down nodes, then the shift register can output effective high-level and low-level scanning signals, but the pulling-up node and outputting signal terminal become floating after resetting, causing instability and leakage
Solution Approach 1:
A potential stabilizing circuit is introduced as an intermediary component between the resetting circuit and the pulling-up node/outputting signal terminal. This stabilizing circuit includes a stabilizing transistor that activates during a potential stabilizing period after resetting to prevent floating states, thereby eliminating leakage and noise without interfering with the normal switching operation of the output transistors
2Device complexity
If the pulling-up node is left floating after resetting, then the circuit structure remains simple, but the level at the gate of outputting transistors becomes unstable due to leakage from surrounding transistors
Solution Approach 1:
The potential stabilizing circuit activates in advance during a dedicated potential stabilizing period immediately after resetting. This preliminary action establishes stable potential levels at the pulling-up node and outputting signal terminal before the output transistors begin their normal operation, preventing any instability or leakage effects from occurring
Data Source
AI summary
Embodiments of the present disclosure provide a shift register unit and a driving method thereof, a gate driving circuit and a display device. The shift register unit comprises a shift register and a potential stabilizing circuit. The potential stabilizing circuit is configured to provide a signal from the reference signal terminal to the pulling-up node and the outputting signal terminal respectively, under a control of the potential stabilizing controlling terminal.