AMOLED Gate Driving Shift Register for Stable Output Voltage
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Solution Overview
Problem
Existing gate driving circuits in Active Matrix Organic Light-Emitting Diode (AMOLED) displays suffer from issues such as direct writing of signal potentials causing step phenomena and floating voltages during output, leading to unstable display performance.
Innovation Solution
A shift register unit with enhanced control subcircuits and transistors is introduced, including input, first, second, third, and output subcircuits, along with capacitors and transistors, to control node connections based on clock and power supply potentials, preventing direct writing and stabilizing node potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing gate driving circuits use simple cascaded shift register units, then device complexity is reduced, but step phenomena occur due to direct writing of signal potentials
Solution Approach 1:
The patent introduces intermediate control circuits between the signal input terminal and the output terminal. These control circuits act as mediators that prevent direct writing of signal potentials, thereby eliminating step phenomena while maintaining circuit functionality. The control circuits include multiple transistors and capacitors that regulate the potential transfer process.
Solution Approach 2:
The gate driving circuit is divided into multiple functional modules: input subcircuit, first control subcircuit, second control subcircuit, third control subcircuit, and output subcircuit. Each module performs a specific function in the signal processing chain, allowing independent optimization and control of potential writing to prevent step phenomena.
2Manufacturing precision
If existing gate driving circuits use simple shift register units, then manufacturing precision requirements are reduced, but floating voltages occur during output leading to unstable display performance
Solution Approach 1:
The control circuits are configured to perform preliminary potential stabilization before signal output. The capacitors in the control subcircuits pre-charge or pre-discharge to predetermined potentials, ensuring that floating voltages are prevented before they can affect display performance. This preliminary action occurs in advance of the actual signal writing operation.
Data Source
AI summary
The present disclosure provides a display device, a gate driving circuit, a shift register unit and a driving method thereof. The shift register unit includes an input subcircuit, a first control subcircuit, a second control subcircuit, a third control subcircuit and an output subcircuit. The third control subcircuit is connected to the first node, the second clock signal terminal and the fifth node, and is configured to control a potential of the fifth node according to potentials of the first node and the second clock signal terminal.