Display Wiring Stress Distribution via Segmented Hole Patterns
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Solution Overview
Problem
Existing display apparatuses face manufacturing defects and reduced lifespan when bent, due to stress concentration and potential cracking in the wiring units at the bending regions.
Innovation Solution
Incorporating a substrate with a bending region and using a first and second wiring unit with distinct bending portions, including a pattern of holes with different shapes and orientations, to distribute stress and prevent disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display apparatus is bent to improve visibility and reduce non-display region area, then the visibility and area efficiency are improved, but manufacturing defects and reduced lifespan occur due to stress concentration in wiring units
Solution Approach 1:
The wiring unit is divided into multiple segments by introducing holes that split the continuous wiring structure. This segmentation allows the wiring to better accommodate bending stress by distributing it across multiple smaller sections rather than one continuous path, preventing stress concentration and cracking at any single location.
Solution Approach 2:
The hole pattern in the wiring unit is specifically designed with varying densities and orientations in different regions. Areas experiencing higher stress during bending have different hole configurations compared to lower-stress areas, optimizing each local region's ability to withstand mechanical stress while maintaining overall electrical connectivity.
2Adaptability or versatility
If the wiring unit is made flexible to allow bending, then the display apparatus can be bent, but stress concentration causes cracking and disconnection
Solution Approach 1:
By introducing holes that segment the wiring unit, the structure becomes more adaptable to bending while maintaining integrity. The segmented structure can flex more easily without concentrating stress at any single point, thus preventing cracking and disconnection during bending operations.
Solution Approach 2:
The hole pattern is designed with curved or rounded features rather than sharp angles, which helps distribute stress more evenly during bending. The curved geometry of the holes and wiring paths prevents stress concentration at sharp corners, reducing the risk of cracking while allowing flexible bending.
3Ease of manufacture
If a simple wiring structure is used, then the manufacturing process is simpler, but stress concentration occurs during bending
Solution Approach 1:
The wiring unit incorporates holes that segment it into multiple sections, which prevents stress concentration during bending. This segmented structure is still manufacturable using standard fabrication processes, balancing manufacturing simplicity with improved reliability during bending operations.
Solution Approach 2:
The wiring unit's physical parameters, such as hole size, spacing, and orientation, are optimized to prevent stress concentration. These parameter changes are implemented through standard manufacturing processes, achieving improved bending reliability without significantly complicating the fabrication process.
Data Source
AI summary
A display apparatus includes a substrate having a bending region between a first region and a second region, the bending region being configured to be bent about a bending axis that extends in one direction; a display unit on the substrate; a first wiring unit at the bending region, the first wiring unit including a first bending portion having a plurality of first holes; and a second wiring unit spaced apart from the first wiring unit and at the bending region, the second wiring unit including a second bending portion having a different shape from the first bending portion.