Shift Register Set-Node Voltage Stabilization Against Transistor Drift
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Solution Overview
Problem
The large negative drift of transistors in shift register units due to voltage impact during operation reduces their service life.
Innovation Solution
A shift register unit with a voltage adjusting circuit that includes capacitors to stabilize the voltage of set nodes in response to clock signal terminals, reducing the negative drift and extending transistor life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shift register unit operates with standard voltage levels, then it achieves normal switching functionality, but large negative drift occurs in transistors reducing their service life
Solution Approach 1:
The voltage adjusting circuit proactively modifies the voltage level before it reaches the transistor, preventing the harmful voltage impact before it occurs. By adjusting the voltage in advance based on clock signal timing, the circuit ensures transistors operate at safe voltage levels throughout their service life.
Solution Approach 2:
The voltage adjusting circuit acts as an intermediary between the clock signal terminal and the transistor, mediating the voltage levels. This intermediate circuit buffers and conditions the voltage, protecting the transistor from direct exposure to harmful voltage spikes while maintaining proper switching functionality.
2Reliability
If voltage adjusting circuit is added to reduce negative drift, then transistor service life is prolonged, but device complexity increases
Solution Approach 1:
The voltage adjusting circuit is merged with the existing shift register unit structure, sharing common elements such as the clock signal terminal and integrating seamlessly with the set node. This combination approach adds voltage adjustment functionality without creating a completely separate complex subsystem.
Solution Approach 2:
The voltage adjusting circuit is designed to serve multiple functions: it adjusts voltage levels, reduces negative drift, and protects transistor reliability. By making this circuit multi-functional, the patent avoids needing separate dedicated circuits for each function, thereby reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The capacitors effectively mitigate voltage fluctuations at the set nodes, prolonging the service life of the transistors and ensuring stable operation of the shift register unit.
Implementation Method 1
a first terminal of the first capacitor is coupled to the first clock signal terminal, and a second terminal of the first capacitor is coupled to the pull-up node
Data Source
AI summary
A shift register unit, a gate driving circuit and a display device are disclosed. The shift register unit includes a shift register and a voltage adjusting circuit. The voltage adjusting circuit is coupled to a set node of the shift register. In a working process, the voltage adjusting circuit is configured to adjust a voltage of the set node in response to a signal of a first clock signal terminal.