Patterned Adhesive Layer for Flexible Display Decoupling
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Solution Overview
Problem
Portable electronic apparatuses with display panels suffer from decoupling issues when bent due to differences in stress applied to the display panel and functional plates, leading to reduced flexibility and increased bending stiffness.
Innovation Solution
A portable electronic apparatus with a patterned first adhesive layer between the display panel and functional plate, and optionally an auxiliary adhesive layer, to reduce overall bending stiffness and maintain flexibility by varying adhesive area distribution across the panel, including island and stripe patterns that intersect or hybrid shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform adhesive layer is used between the display panel and functional plate, then the adhesive force is evenly distributed, but decoupling occurs when the portable electronic apparatus is bent due to uneven stress distribution
Solution Approach 1:
The adhesive layer is applied non-uniformly with different adhesive forces at different locations. The central portion has a first adhesive force while the edge portion has a second adhesive force that is different from the first. This local differentiation allows the adhesive layer to accommodate stress variations during bending, preventing decoupling while maintaining flexibility.
Solution Approach 2:
The adhesive force parameter is changed across different spatial locations of the adhesive layer. By varying the adhesive force from the central portion to the edge portion, the system adapts to the stress distribution pattern that occurs during bending, resolving the contradiction between maintaining adhesion and preserving flexibility.
2Reliability
If the adhesive layer is made stronger to prevent decoupling, then reliability improves, but the bending stiffness increases and flexibility is reduced
Solution Approach 1:
Different regions of the adhesive layer have different adhesive forces tailored to their specific functional requirements. The central portion and edge portion have differentiated adhesive characteristics, allowing the structure to bend flexibly while maintaining reliable adhesion where needed, thus preventing decoupling without excessive increase in overall bending stiffness.
3Reliability
If the adhesive layer area is increased at the central portion compared to the edge portion, then adhesion at the central area is improved, but the overall flexibility may be compromised
Solution Approach 1:
The adhesive layer is designed with spatially varying properties where the central portion has different adhesive characteristics compared to the edge portion. This localized differentiation optimizes adhesion at the central area while preserving flexibility in the edge regions, resolving the contradiction between improved central adhesion and overall flexibility.
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 solution effectively reduces the risk of decoupling and maintains flexibility by distributing stress evenly, allowing the apparatus to be bent without defects and maintaining image quality by minimizing distortion.
Implementation Method 1
a first adhesive layer that is patterned and is disposed between the display panel and the functional plate or between the functional plate and the window
Data Source
AI summary
A portable electronic apparatus includes a display panel which is flexible and thus prevents or protects a defect from occurring when the portable electronic apparatus is bent. The portable electronic apparatus includes: a display panel configured to display an image; a window that is disposed over an image display surface of the display panel; a functional plate that is disposed between the display panel and the window; and a first adhesive layer that is patterned and is disposed between the display panel and the functional plate or between the functional plate and the window.