GOA Detection Circuit for Display Panel Signal Interference
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Solution Overview
Problem
In the development of larger and higher-resolution display panels, such as LCDs and OLEDs, the working status of Gate-on-Array (GOA) drive circuits is critical for production yield and visual quality, but existing technologies face challenges in accurately detecting abnormalities and inter-stage signal interference, which hinders efficient manufacturing and repair processes.
Innovation Solution
A GOA detection circuit is introduced, featuring a data collection wire and unilateral conduction TFTs acting as diodes to block signal interference between stages, along with a time signal control system for abnormality detection, enabling rapid identification of faults and multi-pulse position determination through a testing method that includes a GOA circuit module and detection signal collection module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a GOA drive circuit is formed on substrate around display area to replace external IC, then device integration is improved, but signal interference between different stages occurs
Solution Approach 1:
The patent introduces a detection circuit as an intermediary component between the GOA drive circuit stages. This detection circuit includes detection wires and control transistors that act as mediators to monitor and identify signal interference without disrupting the integrated GOA drive functionality. The intermediary detection mechanism allows the system to maintain high integration while actively managing and detecting harmful signal interference.
2Device complexity
If traditional GOA stage-transmission circuit is used, then device complexity is reduced, but abnormality detection precision deteriorates
Solution Approach 1:
The patent segments the GOA drive circuit into multiple detectable stages by introducing individual detection wires and control transistors for each stage. This segmentation allows the complex integrated circuit to be divided into monitorable units, enabling precise identification of which specific stage is experiencing abnormalities without requiring a complete redesign of the entire circuit architecture.
Solution Approach 2:
The detection circuit implements a feedback mechanism where detection wires monitor the output of each GOA stage and feed this information back through control transistors to a detection node. This feedback system enables continuous monitoring and precise detection of signal abnormalities, allowing the system to maintain simple overall structure while achieving high detection precision through active monitoring loops.
3Area of stationary object
If multiple GOA units are cascaded to drive scanning lines, then scanning coverage is improved, but mutual interference between stages increases
Solution Approach 1:
The patent places detection wires and control transistors as intermediary elements between cascaded GOA units. These intermediaries monitor the signal transitions between stages, allowing the system to maintain extensive scanning coverage through multiple cascaded units while detecting and managing any mutual interference that occurs between adjacent stages.
4Ease of manufacture
If yield determination and fault detection are performed manually, then manufacturing cost is reduced, but productivity deteriorates
Solution Approach 1:
The detection circuit enables the GOA drive circuit to self-diagnose abnormalities through built-in detection wires and control transistors. During manufacturing testing, the circuit automatically identifies faults and determines yield without requiring complex external testing equipment or manual inspection, thereby maintaining low manufacturing costs while significantly improving testing speed and productivity.
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
This solution allows for rapid determination of GOA unit yield and accurate fault localization, facilitating repair and design improvements in display panels by effectively blocking signal interference and detecting abnormalities, thereby enhancing manufacturing efficiency.
Implementation Method 1
Each of the unilateral conduction component is configured to prevent mutual interference between output signals of different stages of GOA units
Data Source
AI summary
The present disclosure provides a gate on array (GOA) detection circuit and a detection method. The GOA detection circuit includes a GOA circuit module and a detection signal collection module. The GOA circuit module includes a plurality of scanning lines, a GOA circuit, a plurality of common control thin film transistors (TFT), and a plurality of single-stage control TFTs. An output end of each scanning line is connected to a signal collection line. A gate of each common control TFT is connected to a detection signal control wire of the detection signal collection module, and a source of each common control TFT is connected to the signal collection line. A test point for detecting an electrical signal is disposed on the signal collection line.