Gate Driving Circuit Inverter Module Pre-Charge Control
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Solution Overview
Problem
The pre-charge effect of a first node in a display panel is affected by a large coincidence voltage value during the potential rise and drop of a second node, leading to inefficiencies in the gate driving circuit.
Innovation Solution
A gate driving circuit comprising cascaded units with a pull-up control module, a node pull-down maintaining module, and an inverter module, where the inverter module transmits a first voltage signal to the second node based on the potential of the first node in the previous stage, reducing the overlapping voltage value by pulling down the second node's potential before the first node is pre-charged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the potential rise of the first node and potential drop of the second node occur simultaneously, then the pre-charge signal can be transmitted to the first node, but a large coincidence voltage value causes the transistor to turn on, affecting the pre-charge effect
Solution Approach 1:
The patent applies preliminary action by pulling down the second node's potential before the first node is pre-charged. The inverter module is activated in advance to ensure the second node is at a low potential state before the pre-charge signal reaches the first node, preventing the coincidence voltage issue during simultaneous potential changes.
2Productivity
If the coincidence voltage value is large during potential rise and drop, then the transistor may turn on, but this affects the pre-charge effect and reduces circuit efficiency
Solution Approach 1:
The inverter module performs preliminary action by establishing the correct potential state of the second node before the pre-charge operation begins. This ensures the transistor remains properly controlled during the pre-charge process, preventing energy loss from unintended conduction while maintaining efficient pre-charge operation.
3Duration of action of moving object
If the potential drop rate at the second node is slow, then the pre-charge process can complete, but a large coincidence voltage value may cause transistor turn-on
Solution Approach 1:
The patent ensures transistor off-state reliability by using the inverter module to pull down the second node's potential in advance before the pre-charge process begins. This preliminary action establishes the correct potential conditions, allowing the pre-charge process to complete without risking transistor turn-on due to coincidence voltage issues.
Data Source
AI summary
A gate driving circuit, a display panel, and a display device are disclosed. The gate driving circuit includes a plurality of gate driving units. At least one gate driving unit includes a second transistor configured to transmit a first voltage signal to a second node of the gate driving unit of the current stage according to a potential of a first node of the gate driving unit in a previous stage before transmitting a pre-charge signal to the first node of the gate driving unit in the current stage. Both the display panel and the display device include gate driving circuits.