Gate Driving Circuit Pair With Coupling Isolation For GOA Faults
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Solution Overview
Problem
Large liquid crystal display panels face issues with short-circuit faults in GOA circuits, leading to abnormal displays or black screens, and insufficient charging of pixel capacitors due to inadequate gate turning on, causing display abnormalities.
Innovation Solution
A gate driving unit circuit pair with dual-side simultaneous driving, where each gate driving unit circuit includes an input sub-circuit, reset sub-circuit, output sub-circuits, and a coupling and isolation sub-circuit, utilizing a first capacitor to isolate and bootstrap signals, ensuring normal output even with short-circuit faults and faulty gate driving unit circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional GOA circuit is used to drive liquid crystal display panels, then the manufacturing cost is reduced and narrow bezel requirements are met, but short-circuit faults occur leading to abnormal displays or black screens
Solution Approach 1:
The gate driving circuit is divided into multiple independent gate driving unit circuits, each capable of independently driving a pixel circuit. This segmentation isolates faults to individual units, preventing short-circuit faults from propagating to other units and causing complete display failure.
Solution Approach 2:
The coupling and isolation sub-circuit is configured in advance to isolate signals between different gate driving unit circuits. When a short-circuit fault occurs, the isolation mechanism is already in place to prevent fault propagation, ensuring display stability without requiring post-fault intervention.
2Device complexity
If a conventional GOA circuit is used, then the gate driver IC is eliminated, but insufficient charging of pixel capacitors occurs due to inadequate gate turning on
Solution Approach 1:
The coupling and isolation sub-circuit acts as an intermediary between different gate driving unit circuits. It ensures proper signal coupling while maintaining isolation, enabling sufficient gate turning on for pixel capacitor charging without requiring a complex gate driver IC.
3Adaptability or versatility
If gate driving unit circuits are connected in cascade, then the driving capability is extended, but short-circuit faults affect upper and lower level circuits
Solution Approach 1:
The cascade-connected gate driving unit circuits are segmented into electrically isolated units by the coupling and isolation sub-circuits. This allows the driving capability to be extended across multiple units while preventing fault propagation between them, maintaining system reliability.
Solution Approach 2:
The coupling and isolation sub-circuit serves as an intermediary that enables signal transmission between cascade-connected gate driving unit circuits while simultaneously providing electrical isolation. This dual function allows extended driving capability without compromising fault isolation.
4Productivity
If dual-side simultaneous driving is implemented, then the charging efficiency of pixel capacitors is improved, but the circuit complexity increases
Solution Approach 1:
The dual-side simultaneous driving function is merged into the basic gate driving unit circuit structure through the coupling and isolation sub-circuit. This allows two gate driving unit circuits to simultaneously drive the same pixel circuit, improving charging efficiency while maintaining a relatively simple circuit structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents short-circuit faults from affecting upper and lower level gate driving unit circuits, maintains the integrity of cascade connections, and ensures proper charging of pixel capacitors, thereby preventing abnormal displays and black screens.
Implementation Method 1
the coupling and isolation sub-circuit comprises a first capacitor, wherein a first terminal of the first capacitor is coupled to the second output terminal, and a second terminal of the first capacitor is coupled to the first output terminal
Data Source
AI summary
A gate driving unit circuit pair and a driving method thereof, a gate driving circuit and a display device are provided. The gate driving unit circuit pair includes two gate driving unit circuits, each of which includes a first output sub-circuit, a second output sub-circuit, and a coupling and isolation sub-circuit. The coupling and isolation sub-circuit is configured to: if the first output sub-circuit outputs signal, isolate the signal of the first output terminal from the signal of the second output terminal; or else, couple the signal of the first output terminal to the second output terminal.