Gate Driving Shift Register for Stable AMOLED Output
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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 instability and disturbance in the output signal.
Innovation Solution
A shift register unit is designed with multiple subcircuits that control connections based on the potential of clock and power supply signals, preventing direct writing and stabilizing node potentials, including input, control, and output subcircuits with transistors and capacitors to manage signal flow and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If signal potentials are directly written to output nodes, then signal transmission speed is improved, but step phenomena and floating voltages occur causing output instability
Solution Approach 1:
The patent introduces intermediate control nodes and control transistors between the signal input and output nodes. These intermediaries prevent direct writing of signal potentials that cause step phenomena, while still enabling efficient signal transmission through controlled pathways.
Solution Approach 2:
The shift register unit is divided into multiple subcircuits including input subcircuit, first control subcircuit, second control subcircuit, output subcircuit, and fourth control subcircuit. Each subcircuit performs specific functions to collectively prevent step phenomena and floating voltages while maintaining signal transmission speed.
2Reliability
If multiple control subcircuits are added to prevent step phenomena, then output stability is improved, but device complexity increases
Solution Approach 1:
The control transistors and nodes in the patent serve multiple functions simultaneously. For example, the first control subcircuit not only prevents step phenomena but also controls connection between different nodes, manages signal flow, and stabilizes voltages across multiple operating conditions.
Solution Approach 2:
Multiple control functions are merged into integrated subcircuits rather than using separate components for each function. The first control subcircuit and second control subcircuit combine multiple control operations into unified structures, reducing overall device complexity while maintaining output stability.
3Reliability
If node connections are controlled based on multiple potential conditions, then floating voltages are prevented, but control circuit complexity increases
Solution Approach 1:
The control subcircuits are designed to preemptively manage node connections based on anticipated signal conditions. By controlling connections in advance based on clock signal potentials and power supply potentials, the circuit prevents floating voltages before they occur, rather than reacting to them.
Solution Approach 2:
The control transistors continuously monitor potential conditions at different nodes and adjust connections accordingly. The control logic uses feedback from clock signal potentials and power supply potentials to dynamically control which nodes are connected, preventing floating voltages through adaptive control.
Data Source
AI summary
The present disclosure provides a display device, a gate driving circuit, and a shift register unit. The shift register unit includes an input subcircuit, a first control subcircuit, a second control subcircuit, a fourth control subcircuit and an output subcircuit. The fourth control subcircuit includes a fourth transistor and a first capacitor, where a first electrode of the fourth transistor is connected to the second clock signal terminal, and a second electrode of the fourth transistor is connected to a seventh node; the first capacitor is connected between a control electrode of the fourth transistor and the seventh node.