Gate Driving Circuit With Independent Pull-Down Node Control
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Solution Overview
Problem
Conventional gate driving circuits experience charging delays in the pull-up node due to insufficient potential to turn on the pull-down control transistor, leading to a collision state where the pull-up node is both pulled high and pulled down.
Innovation Solution
A gate driving circuit with multiple cascaded gate driving units in a multi-stage series, each stage including a pull-up control module, a pull-up node, a pull-down control module, a pull-down node, and a pull-down module. The pull-down control module is connected to the scanning signal input terminal of a previous stage gate driving unit, allowing the potential of the pull-down node to be controlled independently of the pull-up node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull-down control transistor is used to pull down the pull-down node, then the potential control function is achieved, but charging delay occurs in the pull-up node due to insufficient potential
Solution Approach 1:
The gate driving unit is divided into independent modules: pull-up control module, pull-down control module, and pull-down module. Each module independently controls specific nodes, allowing the pull-down node to be controlled separately from the pull-up node, thus resolving the charging delay issue while maintaining reliable potential control.
Solution Approach 2:
A dedicated pull-down module is introduced as an intermediary component that is controlled by the pull-down control module. This intermediary structure enables precise control of the pull-down node without directly affecting the pull-up node charging process, eliminating the collision state and charging delay.
2Ease of operation
If the pull-up node and pull-down node are interconnected through control transistors, then the gate driving function is achieved, but a collision state occurs where the pull-up node is both pulled high and pulled down
Solution Approach 1:
The control architecture is segmented into separate control paths: the pull-up control module controls the pull-up node while the pull-down control module controls the pull-down node. This segmentation prevents the collision state by ensuring independent control of each node, maintaining both operational functionality and potential stability.
Solution Approach 2:
The pull-down control module is designed to activate the pull-down module in advance or independently of the pull-up control, ensuring that the pull-down node is ready to respond without waiting for pull-up node conditions. This preliminary action prevents the collision state by decoupling the control timing of the two nodes.
Data Source
AI summary
A gate driving circuit and a display panel are provided. A gate driving unit in the gate driving circuit includes a pull-up control module, a pull-up node, a pull-down control module, a pull-down node, and a pull-down module. The pull-up control module is electrically connected to the pull-up node. The pull-down control module is electrically connected to the pull-down node. The pull-down control module is electrically connected to a scanning signal input terminal of a previous one stage gate driving unit or a scanning signal input terminal of a previous two stage gate driving unit. The pull-down module is electrically connected to the pull-up node and the pull-down node.