Foldable Display Adhesive Integration for Curvature Accommodation
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Solution Overview
Problem
Foldable display devices face issues with separation between the foldable display panel and the support member due to differences in curvature, leading to visual defects and increased processing time and cost, as the adhesive member is not formed on the folded portion of the support member.
Innovation Solution
A support member with a coating layer on non-adhesive areas and an adhesive member integrally formed on adhesive areas, where the coating layer has a lower adhesive strength than the adhesive member, allowing for seamless folding and unfolding without visible steps and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adhesive member is not formed on the folded portion of the support member, then the curvature difference between the foldable display panel and support member is accommodated, but separation occurs between the panel and support member
Solution Approach 1:
The support member is divided into adhesive and non-adhesive areas with distinct properties. The non-adhesive area on the folded portion allows curvature accommodation, while the adhesive area ensures reliable bonding. This local differentiation resolves the contradiction by allowing separation of functions in different spatial regions.
2Adaptability or versatility
If the adhesive member is not formed on the folded portion, then curvature difference is accommodated, but a step is generated between the folding area and adjacent area
Solution Approach 1:
A coating layer is introduced as an intermediary between the support member and adhesive member in the non-adhesive area. This coating layer has different adhesive strength characteristics, allowing it to bridge the curvature difference and prevent step formation while maintaining the non-adhesive functionality for curvature accommodation.
3Reliability
If separate adhesive members are used for adhesive and non-adhesive areas, then bonding reliability is improved, but device complexity and processing cost increase
Solution Approach 1:
The adhesive member is designed as a single integrated component that covers both adhesive and non-adhesive areas of the support member. The coating layer on the non-adhesive area provides the necessary functional differentiation, eliminating the need for separate adhesive members and reducing overall device complexity.
4Shape
If a coating layer is added on the non-adhesive area, then surface flatness is improved, but manufacturing process complexity increases
Solution Approach 1:
The coating layer is designed with specific material properties (adhesive strength parameters) that enable it to function with minimal thickness. By optimizing the adhesive strength parameter of the coating layer material, the layer can be made thin enough that its addition does not significantly complicate the manufacturing process while still achieving the surface flatness improvement.
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 eliminates the step difference between adhesive and non-adhesive areas, improves visibility, reduces manufacturing costs, and simplifies the bonding process by using a thin coating layer and integrally formed adhesive member, ensuring smooth operation of the foldable display device.
Implementation Method 1
a coating layer on the non-adhesive area of the support member... an adhesive member integrally on the adhesive area of the support member and the coating layer... an adhesive strength between the adhesive member and the coating layer may be less than an adhesive strength between the adhesive member and the foldable display module
Data Source
AI summary
A foldable display device according to example embodiments includes a support member including a first support portion, a second support portion, and a hinge portion connected between the first support portion and the second support portion, the support member being divided into an adhesive area and a non-adhesive area, a coating layer on the non-adhesive area of the support member, an adhesive member integrally on the adhesive area of the support member and the coating layer, and a foldable display module attached on the adhesive member.