Flexible Display Crack Prevention Pattern Design
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Solution Overview
Problem
Flexible display devices with bending areas are prone to cracks due to mechanical stresses, which can damage wirings and induce defects as cracks progress from the bending area's end to its center.
Innovation Solution
A flexible display device design incorporating a substrate with a non-bending and bending area, featuring a crack prevention pattern of varying crack prevention lines densities and numbers across different stress zones within the bending area to mitigate crack progression, including the use of organic and inorganic materials for the pattern and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bending area is introduced to enable flexible display devices to be bendable, rollable, or foldable, then adaptability and versatility are improved, but cracks occur due to mechanical stresses
Solution Approach 1:
The patent applies local quality by introducing a crack prevention pattern specifically in the bending area where cracks are most likely to occur, while leaving other areas unchanged. The pattern density varies locally according to stress distribution, with higher density in high-stress regions and lower density in low-stress regions, optimizing crack prevention where needed without affecting other areas.
Solution Approach 2:
The crack prevention pattern segments the bending area into multiple zones with different pattern densities based on stress levels. The bending area is divided into a first area (high stress), second area (medium stress), and third area (low stress), with corresponding variations in crack prevention line density to address crack prevention needs in each segment.
2Reliability
If crack prevention patterns are added to the bending area, then crack resistance is improved, but device complexity increases
Solution Approach 1:
The crack prevention pattern is applied locally only in the bending area where cracks occur, rather than throughout the entire device. This localized application minimizes the increase in device complexity while effectively addressing the crack resistance issue in the critical bending region.
3Reliability
If the number of crack prevention lines is increased in high stress areas, then crack resistance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements different crack prevention line densities in different areas according to stress distribution. The first area (high stress) has a higher density of crack prevention lines, the second area (medium stress) has medium density, and the third area (low stress) has lower density. This graduated approach optimizes crack resistance while managing manufacturing precision requirements by matching pattern density to actual stress levels.
Data Source
AI summary
A flexible display device includes a substrate including a non-bending area and a bending area adjacent to the non-bending area, and a crack prevention pattern disposed in the bending area. The bending area includes a first area having a first stress when bending, a second area having a second stress less than the first stress when bending, and a third area having a third stress less than the second stress when bending. The crack prevention pattern includes a plurality of crack prevention lines. The number of the crack prevention lines in the first area is greater than the number of the crack prevention lines in the third area.