Low Modulus Support Film for Bendable Display Adhesion
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Solution Overview
Problem
Existing display devices face challenges in maintaining adhesiveness and mechanical integrity when bent or slid, leading to potential detachment of segments from the adhesive layer due to uneven stress distribution and high elastic modulus differences between support films and adhesive layers.
Innovation Solution
A display device design featuring a support film with an elastic modulus of 5 MPa or less, made from thermosetting polymers, and a first adhesive layer with an adhesiveness of 500 gf/inch or greater, where the support film absorbs deformation and secures the adhesiveness of the adhesive layer, preventing segment detachment during bending and sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a support film with high elastic modulus is used to maintain structural stability, then the mechanical strength is improved, but the adhesive layer experiences high stress during bending causing segment detachment
Solution Approach 1:
The patent changes the elastic modulus parameter of the support film from high to low (5 MPa or less) to reduce stress transmission to the adhesive layer during bending, while maintaining structural stability through the low-modulus material properties
Solution Approach 2:
The patent uses composite material structure combining a low elastic modulus support film made of thermosetting polymer with an adhesive layer having high adhesiveness (500 gf/inch or greater), creating a composite system that balances flexibility and bonding strength
2Adaptability or versatility
If the display panel is made flexible to enable bending and sliding, then the adaptability is improved, but the mechanical integrity deteriorates due to stress concentration at bend locations
Solution Approach 1:
The patent changes the elastic modulus parameter of the support film to 5 MPa or less, enabling the display panel to bend and slide while maintaining mechanical integrity by reducing stress concentration at bend locations
Solution Approach 2:
The patent employs a flexible support film made of thermosetting polymer that can accommodate bending and sliding motions, allowing the display panel to change configuration while maintaining structural coherence
3Strength
If the adhesive layer has high adhesiveness to prevent segment detachment, then the bonding strength is improved, but the material selection and manufacturing complexity increase
Solution Approach 1:
The patent specifies an adhesiveness parameter of 500 gf/inch or greater for the adhesive layer, ensuring strong bonding while working with the low elastic modulus support film to maintain overall system compatibility
Solution Approach 2:
The patent applies high adhesiveness specifically at the adhesive layer where bonding is critical, while the support film provides flexibility elsewhere, creating localized optimization of material properties
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 ensures increased reliability by reducing stress on the adhesive layer, maintaining adhesiveness, and preventing segment detachment, even at varying temperatures, thus enhancing the mechanical integrity and durability of the display device.
Implementation Method 1
the support film has a smaller elastic modulus than the first adhesive layer... the support film has a strain magnitude of 5% or greater at the maximum bend location
Data Source
AI summary
A display device is provided. A display device includes a display panel with bendable portions; a support film attached on a bottom surface of the display panel; a first adhesive layer disposed on a bottom surface of the support film; and a plurality of segments disposed on a bottom surface of the first adhesive layer and spaced apart from one another in a first direction, wherein the support film has a smaller elastic modulus than the first adhesive layer.