Display Panel Crack Detection via Test Wiring
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Solution Overview
Problem
During the manufacturing of display panels, signal lines are prone to scratches and cracks, which can affect the touch-control and display functions, and existing methods fail to effectively detect such cracks before the panels enter the next process or reach the client.
Innovation Solution
A display panel design that includes a substrate with signal wiring and test wiring, where the test wiring is insulated and disposed on the side of the signal wiring facing away from the substrate, with test terminals connected to both ends of the test wiring, allowing for the detection of electrical signals such as resistance, capacitance, or voltage values to determine if cracks are present in the test wiring, thereby assessing the risk of cracks in the signal wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal wiring is disposed on the display panel to achieve touch-control or display function, then the display panel can perform touch-control or display function, but the signal wiring is at a risk of being scratched and cracked during manufacturing process
Solution Approach 1:
The test wiring is disposed on the display panel before the signal wiring in the stacking direction, allowing crack detection to be performed in advance during the manufacturing process. This preliminary arrangement enables detection of scratches or cracks that may occur during subsequent manufacturing steps, preventing defective panels from progressing further.
Solution Approach 2:
The test wiring serves as an intermediary element between the substrate and the signal wiring. By measuring electrical properties (resistance, capacitance, or voltage) of the test wiring, the system can indirectly detect cracks or scratches that would affect the signal wiring, without directly testing the signal wiring itself.
2Measurement precision
If test wiring is added to detect cracks in signal wiring, then crack detection capability is improved, but the device structure becomes more complex
Solution Approach 1:
The test wiring is designed to be insulated from the signal wiring but disposed on the same display panel, allowing a single additional wiring layer to serve multiple purposes: maintaining display functionality while enabling crack detection through electrical measurements. This multi-functional approach avoids the need for separate detection devices.
Solution Approach 2:
The test wiring performs self-detection by measuring its own electrical properties (resistance, capacitance, or voltage). When a crack or scratch occurs, the change in electrical properties of the test wiring itself indicates the defect, eliminating the need for external complex detection systems.
3Measurement precision
If test wiring is disposed on the side of signal wiring facing away from substrate, then crack detection is enabled, but the wiring structure becomes more complex
Solution Approach 1:
The test wiring is disposed in a different spatial dimension relative to the signal wiring - specifically on the side facing away from the substrate in the stacking direction. This dimensional arrangement allows the test wiring to detect cracks in the signal wiring without interfering with the signal wiring's function, while maintaining a relatively simple overall 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
This method enables early detection of signal wiring cracks, preventing defective panels from progressing further in the manufacturing process and ensuring the integrity of the display panels by using the test wiring as a protective structure and diagnostic tool.
Implementation Method 1
detecting a resistance value between the first test terminal and the second test terminal
Implementation Method 2
detecting a capacitance value generated by the second test terminal through the first test terminal
Implementation Method 3
detecting a voltage value between the first test terminal and the second test terminal
Data Source
AI summary
A display panel, a crack detection method and a display device are provided. The display panel includes a substrate, a signal wiring disposed over the substrate, and a test wiring insulated from the signal wiring and disposed on a side of the signal wiring facing away from the substrate. An orthographic projection of the test wiring on the substrate overlaps an orthographic projection of the signal wiring on the substrate. The display panel also includes a first test terminal disposed over the substrate and electrically connected with an end of the test wiring, and a second test terminal disposed over the substrate and electrically connected with another end of the test wiring.