Shift Register Unit for Display Gate Driving Circuit
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Solution Overview
Problem
The operating performance of gate driving circuits in display technology is affected by the drift of threshold voltages in transistors over time, leading to issues with node voltage control and noise reduction in GOA (Gate driver On Array) technology.
Innovation Solution
A shift register unit is designed with multiple control circuits and voltage-stabilizing circuits that manage node voltages and bias states to stabilize threshold voltages, ensuring consistent operation by alternating between different bias states for the noise reduction and control transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control circuits and voltage-stabilizing circuits are added to stabilize threshold voltages, then transistor threshold voltage stability is improved, but circuit complexity increases
Solution Approach 1:
The shift register unit is divided into multiple functional modules: input circuit, output circuit, first control circuit, second control circuit, first noise reduction control circuit, second noise reduction control circuit, first voltage-stabilizing circuit, and second voltage-stabilizing circuit. Each module performs a specific function, allowing the complex threshold voltage stabilization task to be broken down into manageable segments that can be designed and analyzed independently.
Solution Approach 2:
The patent implements dynamic bias state switching for the noise reduction control circuits. The first and second noise reduction control circuits are alternately switched between different bias states based on control signals, creating a dynamic operation mode that stabilizes transistor threshold voltages while managing circuit complexity through controlled temporal variation rather than static complexity.
2Reliability
If noise reduction control circuits are switched between different bias states, then threshold voltage drift is reduced, but control circuit complexity increases
Solution Approach 1:
The noise reduction control circuits operate in periodic cycles, alternating between first and second bias states according to control signals. This periodic switching creates a rhythmic operation pattern that effectively counters threshold voltage drift accumulation while maintaining relatively simple control logic based on timing and state transitions.
Solution Approach 2:
The bias states of the noise reduction control circuits are dynamically adjusted based on operational requirements. By transitioning between different bias states rather than maintaining a fixed state, the circuit adapts to changing conditions and stabilizes threshold voltages without requiring permanently complex control structures.
3Reliability
If voltage-stabilizing circuits are used to maintain node voltages, then operating performance consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The voltage-stabilizing circuits are designed to automatically maintain node voltages within acceptable ranges without requiring external intervention or complex manufacturing processes. The circuits self-regulate by detecting voltage deviations and applying corrective actions through the available control signals, reducing the need for precision manufacturing while ensuring consistent operating performance.
Solution Approach 2:
The voltage-stabilizing circuits are configured to proactively maintain node voltages before significant drift occurs. By implementing preventive voltage stabilization rather than corrective action after drift, the system achieves consistent operating performance with simpler manufacturing requirements, as the stabilization mechanism operates within normal operational parameters rather than requiring specialized manufacturing tolerances.
Data Source
AI summary
A shift register unit and a driving method thereof, a gate driving circuit, and a display device are provided. In the shift register unit, the input circuit inputs an input signal to a first node; the output circuit outputs an output signal to an output terminal; the first control circuit performs a first control on a level of a first control node; the first noise reduction control circuit controls a level of a second node; the second control circuit performs a second control on a level of a second control node; the second noise reduction control circuit controls a level of a third node; the first voltage-stabilizing circuit performs a third control on the level of the second control node, and the second control and the third control cause at least part of the second noise reduction control circuit to be in different bias states.