Shift Register Unit Pull-Up Node Potential Control
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Solution Overview
Problem
Existing gate electrode driving circuits face issues with unstable output of driving signals due to the pull-up node's capacitance not contributing to the electric potential increase, leading to incorrect transistor shutdown and impacted signal output.
Innovation Solution
A shift register unit with an output circuit and storage circuit is designed to control the electric potential of the pull-up node, using a storage capacitor to maintain the electric potential during the gate electrode driving signal output stage, ensuring stable connection between the gate electrode driving signal output terminal and the output voltage signal input terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pull-up node and electrode plate are connected to low voltage terminal, then the capacitance of pull-up node can be held up, but the electric potential of pull-up node cannot contribute to increase, causing incorrect transistor shutdown
Solution Approach 1:
A storage capacitor is introduced as an intermediary component between the pull-up node and the output terminal. This storage capacitor maintains the electric potential of the pull-up node during the output stage, allowing the pull-up node's capacitance to contribute to the electric potential increase while preventing incorrect transistor shutdown. The storage capacitor acts as a mediator that resolves the conflict between maintaining capacitance and enabling proper voltage contribution.
2Productivity
If the output circuit connects gate electrode driving signal output terminal and output voltage signal input terminal, then gate electrode driving signal can be output, but the output becomes unstable due to pull-up node capacitance issues
Solution Approach 1:
The storage capacitor is charged in advance during the charging stage before the output stage begins. This preliminary action ensures that the pull-up node has sufficient electric potential when the output circuit connects to the output terminal, preventing output instability. The storage capacitor is pre-charged to maintain the necessary voltage level, allowing the output circuit to function reliably without transient instability.
3Reliability
If the electric potential of pull-up node is maintained during output stage, then output signal stability is improved, but device complexity increases due to additional storage circuit
Solution Approach 1:
The storage capacitor serves multiple functions: it maintains the electric potential of the pull-up node during the output stage, enables the pull-up node's capacitance to contribute to voltage increase, and prevents incorrect transistor shutdown. By making this single component multi-functional, the patent reduces the need for additional complex circuits while achieving stable output. The storage capacitor performs several critical roles that would otherwise require separate circuit elements.
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
This configuration maintains the electric potential of the pull-up node, preventing incorrect transistor shutdown and stabilizing the output voltage of the gate electrode driving signals, thus enhancing the reliability of the gate electrode driving signal output.
Implementation Method 1
the storage circuit is configured to control the electric potential of the pull-up node during the gate electrode driving voltage output stage
Data Source
AI summary
A shift register unit can include a storage circuit and an output circuit respectively connected to a pull-up node, a gate electrode driving signal output terminal, and an output voltage signal input terminal, and can connect or disconnect the gate electrode driving signal output terminal and the output voltage signal input terminal under the control of electric potential of the pull-up node; the storage circuit can be respectively connected to the pull-up node and the gate electrode driving signal output terminal and can control the electric potential of the pull-up node during the gate electrode driving signal output stage, such that the output circuit can connect the gate electrode driving signal output terminal and the output voltage signal input terminal. During a gate electrode driving signal output stage, the electric potential of the pull-up node can be maintained, such that gate electrode driving signals can be outputted normally.