Shift Register Voltage Stabilization for Stable OLED Gate Signals
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Solution Overview
Problem
The potential of the pull-up node in a shift register unit of a gate driving circuit is unstable, affecting the output signal and display performance in OLED display devices.
Innovation Solution
A shift register unit is designed with a voltage-stabilizing circuit that controls the potential of a voltage stabilizer node based on the pull-up node, incorporating transistors and capacitors to stabilize the pull-up node potential and include a sensing circuit to store and input control signals, along with a control circuit to manage the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register unit is used without additional voltage stabilization circuits, then the device complexity is low, but the potential of the pull-up node becomes unstable affecting output signal quality
Solution Approach 1:
A voltage stabilizer node is introduced as an intermediary between the input circuit and the pull-up node. This intermediate node receives the input signal and provides a stabilized voltage to the pull-up node, preventing direct voltage fluctuations from affecting the pull-up node potential. The voltage stabilizer node acts as a buffer that decouples the input signal variations from the pull-up node, thereby stabilizing the potential without requiring complex feedback mechanisms.
Solution Approach 2:
The voltage-stabilizing circuit implements feedback control by monitoring the potential of the pull-up node and adjusting the voltage stabilizer node accordingly. When the pull-up node potential deviates from the desired level, the voltage-stabilizing circuit detects this deviation and automatically adjusts the voltage stabilizer node to compensate, ensuring the pull-up node potential remains stable throughout operation.
2Reliability
If the potential of the pull-up node is stabilized using additional circuits, then the output signal stability improves, but the manufacturing complexity increases
Solution Approach 1:
The shift register unit is segmented into distinct functional modules: an input circuit, a voltage-stabilizing circuit, and an output circuit. Each module performs a specific function and can be independently designed, fabricated, and tested. The voltage-stabilizing circuit is separated as an independent module with dedicated transistors and capacitors, allowing for modular manufacturing and simplifying the overall production process while ensuring stable output signals.
3Object-generated harmful factors
If a voltage-stabilizing circuit is added to control the pull-up node potential, then leakage currents are prevented, but the device complexity increases
Solution Approach 1:
The voltage-stabilizing circuit performs preliminary action by proactively maintaining the voltage stabilizer node at the correct potential level before it can cause leakage currents to occur. The circuit continuously monitors and adjusts the voltage stabilizer node potential to prevent voltage differences that would drive leakage currents through the transistor gates. By preventing the harmful voltage conditions before they arise, the circuit effectively eliminates leakage currents without requiring complex active compensation mechanisms.
Data Source
AI summary
A shift register unit, a driving method thereof, and a gate driving circuit are disclosed. The shift register unit includes: an input circuit configured to receive an input signal from an input signal terminal and output the input signal to a voltage stabilizer node; a voltage-stabilizing circuit configured to input potential of the voltage stabilizer node to a pull-up node and control potential of the voltage stabilizer node; an output circuit configured to receive a clock signal from a clock signal terminal and provide an output signal to an output signal terminal based on the clock signal received under control of the potential of the pull-up node; and a control circuit configured to control potential of the output signal terminal under control of the potential of the pull-up node.