Flexible Display Crack Detection via Inspection Pattern
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Solution Overview
Problem
Flexible display devices face challenges in detecting cracks in their bending portions, which can lead to malfunctions due to excessive stress, as existing methods fail to reliably identify cracks until they become significant, causing defects and inconvenience to users.
Innovation Solution
Incorporating an inspection part with a semiconductor material inspection pattern and a detection system that applies an inspection signal and compares output signals to detect cracks in the bending portion, allowing the driving circuit board to control the display panel's operation and prevent further stress by turning it off when cracks are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made flexible to enable bending, then adaptability and ease of transport are improved, but the reliability deteriorates due to crack formation in bending portions
Solution Approach 1:
The inspection part is formed in advance during the manufacturing process, incorporating an inspection pattern made of semiconductor material that will serve as a stress indicator. This preliminary action enables future detection of crack-prone areas before actual usage stress occurs.
Solution Approach 2:
The inspection pattern utilizes optical property changes (analogous to color changes) to indicate stress and crack formation. When the display panel bends, the inspection pattern's optical properties change, providing visual or detectable signals of stress concentration and potential crack locations.
2Device complexity
If existing inspection methods are used, then device complexity is minimized, but measurement precision deteriorates as cracks are not detected until they become significant
Solution Approach 1:
The inspection pattern is pre-formed during manufacturing with specific geometric features that amplify stress responses. This preliminary structuring enables early detection of stress concentration before actual cracks form, significantly improving measurement precision without adding complex external inspection equipment.
Solution Approach 2:
The inspection pattern is strategically placed in specific locations where stress concentration is most likely to occur during bending. By concentrating inspection resources in these critical local areas, the system achieves high measurement precision for crack detection while maintaining overall system simplicity.
3Measurement precision
If the inspection pattern width is increased to improve detection sensitivity, then measurement precision is improved, but manufacturing precision requirements worsen due to larger pattern dimensions
Solution Approach 1:
The inspection pattern utilizes changes in optical parameters (such as reflectivity, absorption, or interference patterns) rather than relying solely on dimensional parameters. This allows the pattern to maintain a manageable size for manufacturing while still providing high detection sensitivity through optical property variations that amplify stress responses.
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 enables early detection of potential defects in the display panel's bending portion, preventing malfunctions and user inconvenience by predicting and addressing cracks before they cause significant issues, ensuring the display panel operates safely and effectively.
Implementation Method 1
The detector may detect a crack occurring in the inspection part based on a resistance of the inspection part, the detector determining the resistance of the inspection part based on the inspection signal and the output signal
Data Source
AI summary
A flexible display device includes a display panel, at least one inspection part, and a detector. The display panel includes at least one bending portion and a display area. The inspection part is located on the bending portion and bends in a manner similar to the bending portion. The detector applies an inspection signal to the inspection part and receives an output signal from the inspection part. A crack in the inspection part is then determined based on a comparison of the inspection and output signals.