Shift Register Circuit Noise Reduction for Display Panel Stability
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Solution Overview
Problem
In Gate Driver On Array (GOA) circuits, unstable gate driving signals are amplified, leading to distorted signals and abnormal operation of display panels due to the continuous activation of noise reduction transistors, which causes severe drift in threshold voltage and instability in the gate driving circuit.
Innovation Solution
A shift register circuit with a noise reduction sub-circuit and a pull-down node control sub-circuit is implemented, where the noise reduction sub-circuit controls the potential of the pull-down node to alternate between levels, turning the noise reduction transistor on and off to compensate for threshold voltage drift and stabilize the gate driving signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the noise reduction transistor is continuously turned on to reduce noise, then the noise reduction effect is improved, but the threshold voltage drift increases and the transistor becomes unstable
Solution Approach 1:
The patent applies periodic action by controlling the noise reduction transistor to operate in periodic cycles rather than continuously. The transistor alternates between an on-state (reducing noise) and an off-state (allowing threshold voltage recovery), creating a rhythmic operation pattern that balances noise reduction with transistor stability. This is achieved through periodic switching signals that regulate the transistor's conduction periods.
Solution Approach 2:
The patent implements dynamics by making the noise reduction transistor's operating state changeable rather than fixed. The transistor dynamically transitions between different operational states (on and off) based on timing signals and circuit conditions. This dynamic control allows the system to adapt the transistor's behavior to different operational phases, preventing continuous conduction and its associated threshold voltage drift while maintaining noise reduction effectiveness.
2Length of stationary object
If the gate driving signal is transmitted stage by stage to extend the driving range, then the coverage is improved, but the unstable signal is amplified and distortion increases
Solution Approach 1:
The patent applies feedback by implementing a circuit mechanism where the output signal state influences the input signal generation. The shift register circuit monitors its own output and uses this information to regulate subsequent signal transmission stages. This feedback loop allows the circuit to detect and correct signal degradation, preventing the amplification of instability that would normally occur during multi-stage transmission and extending the reliable driving range.
Data Source
AI summary
A shift register circuit includes a noise reduction sub-circuit and a pull-down node control sub-circuit. A control end of the noise reduction sub-circuit is connected to a pull-down node, the noise reduction sub-circuit is connected to a first voltage input end. The pull-down node control sub-circuit includes a first pull-down node control sub-circuit and a second pull-down node control sub-circuit. The second pull-down node control sub-circuit controls the pull-down control node to be connected to a first clock signal input end when the first clock signal input end inputs a first level, the pull-down node to be connected to the first clock signal input end when a potential of the pull-down control node is at the first level, so that the potential of the pull-down node is at a first level and a noise reduction transistor included in the noise reduction sub-circuit is turned off.