Non-adhesive member reduces stress in folding display adhesive
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Solution Overview
Problem
Flexible display apparatuses face challenges in maintaining durability and display quality due to stress accumulation and deformation in the folding area during repeated folding and unfolding, which affects their shape and image display.
Innovation Solution
A display apparatus design featuring a display module with a folding area, support members, and an adhesive member, where non-adhesive members are strategically placed to reduce coupling strength between the adhesive and support members, particularly in the folding area, using materials like fluorine or titanium, and varying adhesive strengths to distribute stress and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive member is made strong and rigid to support the display module, then the structural strength is improved, but stress concentration and deformation occur in the folding area during repeated folding
Solution Approach 1:
The adhesive member is designed with spatially varying adhesive strength: high adhesive strength in non-folding areas to provide structural support, and low adhesive strength in the folding area to reduce stress concentration. This local differentiation allows the adhesive member to simultaneously achieve structural strength and durability through targeted adhesive properties in different regions.
2Stability of the object's composition
If the support member is made rigid to maintain shape, then the shape stability is improved, but deformation occurs in the folding area during repeated folding operations
Solution Approach 1:
The support member is designed with spatially varying rigidity: high rigidity in non-folding areas to maintain shape stability, and low rigidity in the folding area to accommodate repeated folding without deformation. This local differentiation enables the support member to provide overall structural stability while allowing controlled flexibility in the folding region.
3Strength
If the adhesive member is made uniformly strong across all areas, then the bonding strength is improved, but stress distribution becomes uneven causing deformation in the folding area
Solution Approach 1:
The adhesive member features non-uniform adhesive strength distribution: strong bonding in non-folding areas and weakened bonding in the folding area. This spatial variation in adhesive properties ensures strong overall attachment while preventing stress concentration that would cause deformation, thereby maintaining display quality and preventing image distortion.
Data Source
AI summary
A display apparatus includes a display module configured to display an image, and defining a folding area that is in-foldable about an imaginary folding axis, and a plurality of non-folding areas adjacent respective sides of the folding area in a plane, a support member having a plate shape under the display module, an adhesive member between the display module and the support member, and at least one first non-adhesive member overlapping with the folding area and located between the adhesive member and the support member.