Foldable Display Wiring Layout for Stress-Resistant Bending
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Solution Overview
Problem
Existing display apparatuses face defects such as disconnection and reduced lifespan when bent, due to stress concentration on wiring units at the bending region, leading to poor image quality and manufacturing issues.
Innovation Solution
Incorporating a first wiring unit with a first bending portion and a second wiring unit with a second bending portion, both having different shapes and resistance values, to alleviate stress concentration and improve flexibility, with the second wiring unit having a lower resistance to ensure better power supply to the display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is bent to improve visibility or reduce non-display area, then adaptability and compactness are improved, but stress concentration occurs on wiring units leading to disconnection and reduced lifespan
Solution Approach 1:
The wiring unit is divided into multiple segments along its length, with each segment having different bending radii. This segmentation allows the wiring to flex at multiple points rather than concentrating stress at a single location, thereby maintaining electrical connection reliability while enabling the display apparatus to be bent.
Solution Approach 2:
Different portions of the wiring unit are designed with different local properties - specifically, different bending radii at different locations. The wiring has smaller bending radii at certain segments and larger bending radii at others, creating localized variations in flexibility and stress distribution that prevent disconnection during bending.
2Reliability
If the wiring unit is made rigid to ensure stable electrical connection, then connection reliability is improved, but flexibility and bending capability are reduced
Solution Approach 1:
The wiring unit is designed with dynamic bending characteristics, where different segments can bend at different angles and radii depending on the bending direction and magnitude. This dynamic flexibility allows the wiring to adapt to various bending scenarios while maintaining stable electrical connections through proper stress distribution.
Solution Approach 2:
The bending radius parameter is varied along the length of the wiring unit, creating a gradient of flexibility. By changing the bending radius parameter at different locations, the wiring achieves both the flexibility needed for bending and the stability required for reliable electrical connections.
3Ease of manufacture
If uniform wiring structure is used throughout the display apparatus, then manufacturing simplicity is maintained, but stress distribution during bending is poor leading to defects
Solution Approach 1:
The wiring unit employs an asymmetric structure where the left and right portions have different bending radii and geometric configurations. This asymmetric design creates more favorable stress distribution patterns during bending, reducing the likelihood of defects such as disconnection while remaining manufacturable through standard fabrication processes.
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.