Display Device Crack Detection Lines for Moisture Infiltration Prevention
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Solution Overview
Problem
Flexible display devices face challenges in detecting cracks during manufacturing, which can lead to moisture infiltration and reliability issues over time, as small cracks may not be easily detected and can grow, affecting device operation.
Innovation Solution
A display device design incorporating a substrate with a display area and non-display area, featuring first and second crack detection lines disposed in the non-display area, electrically connected to data lines, and configured to surround the display area, allowing for crack detection and identification of crack positions through resistance-based voltage testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple crack detection lines are added to detect cracks, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The crack detection lines are integrated with the existing data lines of the display device, allowing the data lines to serve dual functions: transmitting data signals to pixels and detecting cracks through resistance measurements. This multi-functionality approach improves crack detection capability without adding separate dedicated detection lines, thus avoiding increased device complexity
Solution Approach 2:
The patent combines the crack detection function with the data line structure by electrically connecting the crack detection lines to the data lines. This merging allows the detection system to utilize existing structural elements, improving measurement precision while minimizing the increase in device complexity
2Measurement precision
If crack detection lines are placed close to the display area, then detection sensitivity is improved, but manufacturing difficulty increases
Solution Approach 1:
The crack detection lines are strategically positioned in the non-display area at specific distances from the display area boundary. This local placement optimization allows the detection lines to be close enough to detect cracks with high sensitivity while being far enough to avoid interference with the manufacturing processes of the display area, thus balancing detection sensitivity with manufacturing ease
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
Enables effective detection and identification of cracks in the display device, improving yield and reliability by determining crack presence and position, thereby preventing moisture infiltration and maintaining device performance.
Implementation Method 1
configured to surround the display area, allowing for crack detection and identification of crack positions through resistance-based voltage testing
Data Source
AI summary
A display device including a substrate having a display area and a non-display area outside the display area, a plurality of pixels disposed on the substrate in the display area, an external circuit bonded on the substrate in the non-display area, a first signal line disposed on the substrate in the non-display area and surrounding at least a portion of the display area, the first signal line being electrically connected to the external circuit, and a second signal line disposed in the non-display area and surrounding at least a portion of the first signal line, the second signal line being electrically connected to the external circuits.