Foldable Display Adhesive Thickness Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable electronic apparatuses face a trade-off between flexibility and impact resistance, as increased flexibility for bending or folding reduces reliability against external impacts.
Innovation Solution
The use of adhesive members with specific thickness ratios between the display panel and window member, where the first adhesive member's thickness exceeds 20% of the maximum thickness and the second adhesive member's thickness is less than 125 micrometers, provides a balanced structure for improved flexibility and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the external members are made flexible to enable curving, bending, or folding, then the flexibility is improved, but the reliability against external impacts is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of adhesive members to resolve the contradiction between flexibility and impact resistance. The first adhesive member has a thickness of 1 micrometer to 125 micrometers, while the second adhesive member has a thickness of 1 micrometer to 50 micrometers. This specific parameter control allows the external members to maintain both flexibility for folding and sufficient impact resistance, as the adhesive thickness directly influences the mechanical properties of the stacked structure.
Solution Approach 2:
The patent employs composite materials by creating a stacked structure consisting of multiple different members (display panel, optical members, adhesive members, and external members) with distinct material properties. This composite structure combines the flexibility of certain layers with the rigidity of others, achieving both adaptability for folding and reliability against impacts through the synergistic combination of different materials in the stack.
2Reliability
If the adhesive member thickness is increased to improve impact resistance, then the reliability is improved, but the flexibility is reduced
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific thickness ranges for different adhesive members. The first adhesive member (1-125 micrometers) and second adhesive member (1-50 micrometers) have controlled thicknesses that balance impact resistance and flexibility. This precise parameter control ensures that the structure maintains sufficient rigidity for impact protection while preserving the flexibility needed for folding operations.
Solution Approach 2:
The patent applies local quality by assigning different thickness specifications to different adhesive members in the stack. The first adhesive member has a larger thickness range (1-125 micrometers) compared to the second adhesive member (1-50 micrometers), creating localized variations in mechanical properties. This local differentiation allows specific regions to provide impact resistance while other regions maintain flexibility, resolving the overall contradiction.
3Reliability
If the stacked structure has high rigidity to resist external impacts, then the impact resistance is improved, but the stress from folding increases
Solution Approach 1:
The patent uses composite materials to create a stacked structure where different members contribute different mechanical properties. The combination of rigid components (display panel, optical members, external members) with flexible adhesive layers creates a composite structure that resists external impacts while accommodating folding stresses. The layered composite design allows the structure to maintain overall rigidity for impact protection while the adhesive layers provide stress relief during folding.
Solution Approach 2:
The patent applies parameter changes by controlling the thickness parameters of adhesive members to optimize the balance between rigidity and folding stress resistance. The specific thickness ranges (first adhesive: 1-125 micrometers, second adhesive: 1-50 micrometers) create an optimal mechanical balance, providing sufficient rigidity for impact resistance while maintaining flexibility to relieve folding stresses, preventing the contradiction from manifesting.
Data Source
AI summary
An electronic apparatus includes a display panel having a display element and being configured to be folded or unfolded about a folding axis extending in a first direction, a window member disposed on the display panel, a first optical member disposed between the display panel and the window member, and a plurality of adhesive members disposed between the display panel and the window member. The adhesive members include a first adhesive member disposed on a surface of the display panel and having a first thickness and a second adhesive member disposed on a surface of the first optical member. The first thickness exceeds about 20% of a thickness of an adhesive member having a maximum thickness of the plurality of adhesive members, and the second thickness is smaller than about 125 micrometers.