Display Device Crack Detection Wiring with Segmented Resistance
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Solution Overview
Problem
Existing display devices with crack detection wiring lines formed of a single wire cannot accurately assess the severity or propagation propensity of cracks, leading to incorrect classification of non-defective products and increased manufacturing costs due to decreased yield.
Innovation Solution
A display device with a pair of inspection terminals and multiple crack detection wiring lines, where each line has distinct resistance values and connections, allowing for the determination of crack severity and propagation by measuring resistance values through the terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wire crack detection wiring line is used, then the detection structure is simple, but the crack severity and propagation propensity cannot be detected
Solution Approach 1:
The single crack detection wiring line is divided into multiple separate wiring lines (first crack detection wiring line and second crack detection wiring line). Each wiring line is configured to detect cracks in specific regions or with different characteristics, enabling differentiated detection of crack severity and propagation propensity while maintaining relatively simple individual line structures.
2Measurement precision
If multiple crack detection wiring lines with different resistance values are used, then crack severity and propagation can be detected, but the device complexity increases
Solution Approach 1:
Different crack detection wiring lines are assigned different resistance values tailored to their specific detection functions. The first crack detection wiring line has a first resistance value optimized for detecting crack severity, while the second crack detection wiring line has a second resistance value optimized for detecting propagation propensity. This localized optimization of resistance characteristics enables precise crack assessment without requiring complex overall device architecture.
3Ease of operation
If cracks are detected using a single wire, then the detection process is simple, but non-defective products are incorrectly classified leading to decreased yield
Solution Approach 1:
The inspection system uses the resistance values measured from multiple crack detection wiring lines to provide feedback about crack characteristics. By comparing the resistance values and their changes, the system can accurately distinguish between acceptable cracks and fatal defects, enabling correct classification of products and improving yield by avoiding unnecessary rejection of non-defective products.
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
Improves the yield and reduces manufacturing costs by accurately classifying defects and identifying non-defective products through precise crack detection and propagation assessment.
Implementation Method 1
each having a different resistance value, and in which a resistance value of each of the plurality of crack detection wiring lines is measured through the pair of inspection terminals
Data Source
AI summary
A display device includes a display region;a frame region around a periphery of the display region; a terminal portion including a first terminal and a second terminal, and a plurality of input terminals provided between the first terminal and the second terminal and connected respectively to a plurality of first signal lines extending from the display region and in a signal line formation region of the frame region; and a plurality of crack detection wiring lines provided in the frame region, the plurality of crack detection wiring lines each including a first end and a second end disposed on either side of the signal line formation region, wherein each first end of the plurality of crack detection wiring lines is electrically connected to the first terminal, and each second end of the plurality of crack detection wiring lines is electrically connected to the second terminal.