Folding Display Adhesive Modulus for Impact Resistance
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Solution Overview
Problem
Flexible display devices face challenges in maintaining protection and durability during folding and bending operations without compromising their functionality, as existing solutions often fail to balance impact resistance and flexibility effectively.
Innovation Solution
An electronic device design featuring a display module with a folding display unit, non-folding display units, a support member with patterned folding and non-folding parts, and an adhesive layer between the display module and support member, where the adhesive layer has a modulus of about 1 MPa to 1500 MPa at −20°C, providing a balance between impact resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid support structure is used to protect the display module, then impact resistance is improved, but folding flexibility deteriorates
Solution Approach 1:
The support member is divided into multiple regions with different structural characteristics: a folding part corresponding to the folding display unit and non-folding parts corresponding to the non-folding display units. This segmentation allows each region to have optimized properties for its specific function.
Solution Approach 2:
The support member exhibits local quality through having a folding part with different mechanical properties than the non-folding parts. The folding part is designed with patterns (grooves, openings, or resin portions) that provide flexibility where needed, while the non-folding parts maintain rigidity for impact protection.
2Strength
If a thick adhesive layer is used to cushion impacts, then impact resistance is improved, but folding operation smoothness deteriorates
Solution Approach 1:
The adhesive layer's mechanical properties are precisely controlled by specifying its modulus within the range of 1 MPa to 1500 MPa at -20°C. This parameter optimization allows the adhesive to provide adequate impact cushioning while maintaining sufficient flexibility for smooth folding operations.
Solution Approach 2:
The adhesive layer acts as a composite element between the rigid support member and the flexible display module, combining the benefits of both rigid support and flexible connection to achieve both impact resistance and folding smoothness.
3Adaptability or versatility
If a thin support member is used to maintain flexibility, then folding flexibility is improved, but impact resistance deteriorates
Solution Approach 1:
The support member is segmented into a folding part and non-folding parts, allowing the overall structure to be thin enough for flexibility while the non-folding parts provide localized impact protection where full rigidity is needed.
Solution Approach 2:
The support member includes patterns (grooves, openings, or resin portions) that modify its structural dimensions and distribution of material, enabling a thin overall thickness while maintaining localized strength through strategic material placement.
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 enhances the electronic device's folding properties and impact resistance, preventing damage to the display module from external impacts while maintaining flexibility for folding operations.
Implementation Method 1
an adhesive layer disposed between the display module and the support member, wherein the adhesive layer has a modulus of about 1 megapascal (MPa) to about 1500 MPa at −20 degrees Celsius (° C.)
Data Source
AI summary
An electronic device includes a display module including a folding display unit which extends in a first direction and be foldable with reference to a folding axis and a first non-folding display unit and a second non-folding display unit which are spaced apart from each other with the folding display unit therebetween; a support member disposed below the display module, and including a folding part having a plurality of patterns defined therein and corresponding to the folding display unit and a first non-folding part and a second non-folding part respectively corresponding to the first non-folding display unit and the second non-folding display unit; and an adhesive layer disposed between the display module and the support member. The adhesive layer has a modulus of about 1 megapascal (MPa) to about 1500 MPa at −20 degrees Celsius) (° C.).