Shift Register Anti-Leakage Circuit for Display Panels
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Solution Overview
Problem
In flat-panel display panels, the pull-up nodes in shift register units experience electricity leakage due to the characteristics of oxide thin film transistors, leading to instability in the gate ON signal output.
Innovation Solution
A shift register unit is designed with an input circuit, a reset circuit, a first anti-leakage circuit, and an output circuit, where the first anti-leakage circuit connects the pull-up node to the first and second nodes, reducing the internal potential difference and preventing leakage current, thereby stabilizing the signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oxide thin film transistors of depletion type are used in the shift register unit, then the aesthetic design and integration can be achieved, but electricity leakage occurs at the pull-up node due to large potential difference
Solution Approach 1:
The shift register unit is divided into multiple functional modules: input circuit, reset circuit, anti-leakage circuit, and output circuit. Each module handles specific functions to isolate and control the potential difference at the pull-up node, preventing electricity leakage while maintaining the integrated design.
Solution Approach 2:
The anti-leakage circuit acts as an intermediary between the pull-up node and other circuits. It monitors and controls the potential difference at the pull-up node, preventing electricity leakage by intervening when the potential difference becomes too large, thus ensuring signal stability.
2Power
If the potential difference at the pull-up node is increased to improve signal output, then the gate ON signal can be strengthened, but electricity leakage through oxide thin film transistors increases
Solution Approach 1:
The anti-leakage circuit dynamically adjusts its operation based on the potential difference at the pull-up node. When the potential difference exceeds a threshold, the anti-leakage circuit activates to prevent electricity leakage, allowing the system to maintain strong signal output without excessive energy loss.
Solution Approach 2:
The anti-leakage circuit provides feedback control by monitoring the potential difference at the pull-up node and adjusting its conduction state accordingly. This feedback mechanism ensures that the signal output remains strong while preventing electricity leakage that would cause energy loss.
Data Source
AI summary
A shift register unit and a driving method therof, a gate drive circuit and a display device are disclosed. The shift register unit includes an input circuit, a reset circuit, a first anti-leakage circuit and an output circuit. Because the signal of the pull-up node is provided to the first node and the second node by the first anti-leakage circuit, internal potential difference among the input circuit, the reset circuit, and the first anti-leakage circuit is relatively small, the input circuit is connected with the pull-up node, the reset circuit is connected with the pull-up node and the second node simulatneously, and the first anti-leakage circuit is connected with the first node, the pull-up node and the second node simultaneously.