Gate Driving Circuit Node Potential Stability
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Solution Overview
Problem
The stability of gate driving circuits in display panels is poor, which can affect the display effect of the panels.
Innovation Solution
A gate driving circuit is designed with a plurality of cascaded gate driving sub-circuits, each including an input circuit, an output circuit, a reset control circuit, and a pull-down holding circuit. These components work together to reset and maintain the potential of key nodes, improving circuit stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GOA technique integrates gate driving circuit on array substrate to reduce costs, then material cost and manufacturing complexity are reduced, but circuit stability deteriorates
Solution Approach 1:
The pull-down holding circuit pre-charges the first node to a first potential before the scanning signal is output, and then maintains this potential during the non-display period. This preliminary action ensures that the node is ready for the next scanning cycle, preventing instability without adding complex external circuitry.
Solution Approach 2:
The gate driving circuit operates in periodic cycles with distinct display periods and non-display periods. During the non-display period, the pull-down holding circuit activates to reset and maintain node potentials, preparing the circuit for the next display period. This periodic operation ensures stable repeated scanning while maintaining the simple integrated structure.
2Duration of action of moving object
If gate driving circuit operates continuously to maintain display function, then display continuity is ensured, but node potential drift and circuit instability increase
Solution Approach 1:
The circuit alternates between display periods (outputting scanning signals) and non-display periods (resetting and holding node potentials). This periodic cycling allows the circuit to maintain continuous display function while periodically resetting internal node potentials to prevent drift and instability accumulation.
Solution Approach 2:
Before each new display period begins, the pull-down holding circuit pre-charges the first node to the appropriate potential during the non-display period. This preliminary preparation ensures the circuit is ready for the next scanning cycle, preventing potential drift and ensuring stable continuous operation.
Data Source
AI summary
Gate driving circuits, display panels, and display devices are provided. The gate driving circuit includes cascaded gate driving units, each of which includes an input unit, an output unit, a reset control unit, and a pull-down holding unit. The input unit outputs a driving signal to a first node. The output unit outputs a scanning signal in response to the driving signal. The reset control unit outputs a reset control signal to a second node during a first period. The pull-down holding unit receives the reset control signal. The pull-down holding unit outputs a first voltage signal to the first node in response to the reset control signal to reset a potential of the first node during the first period, and outputs the first voltage signal to the first node to maintain the potential of the first node during a second period.