Foldable Display Window Bonding Member for Film Removal Control
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Solution Overview
Problem
Foldable display devices experience defective film removal due to stress during repeated folding operations, which compromises the adhesive properties of the bonding layers.
Innovation Solution
A display device with a window bonding member having a modulus of 1 MPa to 10 MPa and a thickness of 300 micrometers or less is used to manage adhesive properties and prevent defective film removal, ensuring durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bonding member with high modulus is used to ensure strong adhesion, then bonding strength is improved, but film removal occurs during repeated folding operations
Solution Approach 1:
The patent applies parameter changes by precisely controlling the modulus of the bonding member to be within 1-10 MPa and the thickness to be 300 μm or less. This parameter optimization allows the bonding member to maintain sufficient adhesion strength while accommodating stress during folding operations, preventing film removal defects.
Solution Approach 2:
The patent employs composite materials by combining the bonding member with specific thickness (300 μm or less) and controlled modulus (1-10 MPa) properties. This composite approach creates a bonding structure that integrates both strength requirements and flexibility needs, resolving the contradiction between strong adhesion and stress accommodation during folding.
2Strength
If the bonding member thickness is increased to improve structural integrity, then bonding strength is improved, but flexibility during folding is reduced
Solution Approach 1:
The patent resolves this contradiction by changing the thickness parameter to 300 μm or less while simultaneously optimizing the modulus to 1-10 MPa. This parameter combination ensures the bonding member remains thin enough for flexibility during folding while maintaining sufficient structural integrity and bonding strength.
3Adaptability or versatility
If repeated folding operations are performed to achieve foldable display function, then device functionality is improved, but adhesive properties of bonding layers deteriorate
Solution Approach 1:
The patent addresses this contradiction by optimizing the bonding member parameters (modulus: 1-10 MPa, thickness: 300 μm or less) to create a material that can withstand repeated folding operations. These parameter changes enable the bonding member to maintain its adhesive properties over thousands of folding cycles while supporting the foldable display function.
Data Source
AI summary
A display device includes a display panel, a polarization member facing the display panel, a cover window including an inorganic material and facing the display panel with the polarization member therebetween, and a window bonding member which is between the cover window and the polarization member attaches the cover window to the polarization member. The window bonding member which attaches the cover window to the polarization member has a modulus of about of 1 MPa to about 10 MPa.