Display Panel Testing Lines for Defect Detection
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Solution Overview
Problem
Existing methods for detecting defects in liquid crystal displays (LCDs) fail to effectively identify damaged pixels when adjacent data lines are short-circuited, leading to reduced yield rates and manufacturing costs.
Innovation Solution
The implementation of a display panel design with first and second testing lines electrically connected to sub-signal lines on different layers, allowing for the detection of defects by isolating and testing each set of sub-signal lines independently, thereby preventing short circuit effects and improving defect identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adjacent data lines are electrically connected to pixels and tested using related art methods, then the testing process is simple, but damaged pixels connected to short-circuited data lines cannot be effectively detected
Solution Approach 1:
The signal lines are divided into multiple sets of sub-signal lines (first sets and second sets) that are alternatively arranged and formed on different layers. Each set can be independently tested through dedicated testing lines, allowing defects in specific line segments to be identified without interference from adjacent lines that may be short-circuited.
Solution Approach 2:
Sub-signal lines are formed on different layers (first layer and second layer) instead of being coplanar. This vertical separation in the third dimension prevents short circuits between adjacent data lines while maintaining the electrical connection to pixels, enabling independent testing of each layer's signal lines.
2Reliability
If sub-signal lines are formed on different layers with alternative arrangement, then short circuit effects are prevented and defect detection is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The signal line system is segmented into multiple independent sets of sub-signal lines on different layers. Each set can be manufactured and tested separately, allowing for targeted process optimization and defect identification without requiring complete re-manufacturing of the entire signal line system.
Solution Approach 2:
The alternatively arranged sub-signal lines on different layers serve multiple functions: they provide independent signal transmission paths, enable separate testing of each layer, and prevent short circuits between adjacent lines. This multi-functional design improves reliability without proportionally increasing manufacturing complexity.
Data Source
AI summary
A display panel includes a first substrate, a plurality of pixel units, a plurality of first signal lines, a first testing line and a second testing line. The first signal lines are disposed on a peripheral area and electrically connected to corresponding pixel units. The first signal lines include a plurality of first sets of signal lines and a plurality of second sets of signal lines alternatively arranged. The first and second sets of signal lines are formed on different layers. The first testing line is electrically connected to the first sets of signal lines. The second testing line is electrically connected to the second sets of signal lines.