Flexible Display Module Transition Holes for Bending Stress Relief
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Solution Overview
Problem
Flexible electronic devices, such as screens in cell phones or tablets, suffer from screen failure and reduced lifespan due to excessive bending stress, leading to cracking and delamination issues.
Innovation Solution
A flexible display module design featuring a substrate layer with a bending area, transition areas, and non-bending areas, incorporating strip-shaped target through-holes with a length-to-width ratio greater than 50:1, which deform to manage internal stress during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If micro-mesh holes are arranged on the ultra-thin stainless steel substrate, then the substrate provides flexibility and bending capability, but the screen cracks and delaminates due to excessive internal stress during bending
Solution Approach 1:
The patent applies local quality by creating through-holes specifically in the transition areas where bending stress is most concentrated, rather than uniformly distributing holes across the entire substrate. This localized approach allows the transition areas to have different mechanical properties (stress relief) compared to the bending and non-bending areas, effectively reducing internal stress and preventing cracking and delamination while maintaining overall flexibility
Solution Approach 2:
The patent changes the geometric parameters of the through-holes by specifying a length-to-width ratio greater than 50:1, which fundamentally alters how stress is distributed and relieved in the transition areas. This parameter change enables the holes to effectively accommodate dimensional changes during bending without causing screen failure, thereby improving reliability while preserving bending capability
2Area of stationary object
If the size of the display layer increases, then the display area and functionality are improved, but the internal stress generated during bending increases, reducing lifespan
Solution Approach 1:
The patent addresses this contradiction by locally modifying the substrate structure in the transition areas through the addition of elongated through-holes. This local modification allows larger display panels to accommodate bending stresses without proportionally increasing overall stress levels, thereby extending lifespan while maintaining large display area
Solution Approach 2:
The patent segments the substrate into distinct functional areas (bending area, transition areas with through-holes, and non-bending areas). This segmentation allows the transition areas to specifically handle stress relief for larger display panels, enabling the overall structure to support increased display area without compromising lifespan
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
The design effectively reduces internal stress, preventing cracking and delamination, thereby extending the lifespan and improving user experience of flexible electronic devices.
Implementation Method 1
A strip-shaped target through-hole is formed in a transition area and has a length-to-width ratio greater than 50:1. The target through-hole deforms in response to the flexible display module bending.
Data Source
AI summary
A flexible display module includes a display layer and a substrate layer. The substrate layer is attached to the display layer and includes a bending area in the middle, two transition areas arranged on two sides of the bending area, and two non-bending areas on outer sides of the two transition areas. A strip-shaped target through-hole is formed in a transition area and has a length-to-width ratio greater than 50:1. The target through-hole deforms in response to the flexible display module bending.