GOA Drive Circuit Pre-Pulldown Unit for Node Voltage Stability
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Solution Overview
Problem
GOA drive circuits face instability in node voltages and operation timing due to component replacement difficulties and potential electric leakage, leading to timing errors and display faults.
Innovation Solution
The introduction of a pre-pulldown unit in each GOA drive unit stage, which disconnects the discharge path of voltage at point Q before it jumps from a low to a high electric potential, ensuring stable node voltages and reliable operation timing through a cascade connection of transmission units and transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the GOA drive circuit is directly arranged on the array substrate, then the amount of gate IC chip used can be saved and design of frameless display screen can be realized, but it is not convenient to replace components and voltage changes may occur leading to operation timing errors
Solution Approach 1:
The pre-pulldown unit performs preliminary action by disconnecting the discharge path of the first voltage signal before it jumps from low to high electric potential. This preventive measure ensures that voltage drift and electric leakage do not affect the stability of node voltages, thereby maintaining reliable operation timing while keeping the GOA drive circuit integrated on the array substrate.
2Device complexity
If the discharge path of the first voltage signal is not disconnected in advance, then the circuit structure remains simple, but voltage changes occur causing operation timing errors and display faults
Solution Approach 1:
The pre-pulldown unit is configured to disconnect the discharge path of the first voltage signal via the pull-down sustaining unit before the first voltage signal jumps from a low electric potential to a high electric potential. This preliminary disconnection prevents voltage drift and electric leakage from affecting subsequent operations, ensuring accurate operation timing without significantly increasing circuit complexity.
Data Source
AI summary
A GOA drive circuit includes a multiple stage of GOA drive units. A GOA drive unit includes a pre-pulldown unit which is configured to disconnect a discharge path of a first voltage signal via the pull-down sustaining unit before the first voltage signal jumps from a low electric potential to a high electric potential. In the GOA drive circuit, the voltage stability of the key nodes in a circuit and the reliability of the timing can be ensured; overall performance of the GOA drive circuit can be improved; and a service life of a display device can be prolonged.