Flexible Display Protection Film with Segmented Adhesive Dots
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Solution Overview
Problem
Current display devices, such as OLED and liquid crystal displays, face limitations in curvature radius when bent for larger screens, due to constraints in protection film design, which affects user preference and manufacturing flexibility.
Innovation Solution
A display device with a protection film featuring a carrier film and an adhesive layer with non-continuous adhesive dots, allowing for controlled curvature and improved flexibility, where the carrier film can be treated to have hydrophobic and hydrophilic regions, and the adhesive layer is formed using a non-continuous spray method to enhance adhesion and reduce force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection film is used to protect the display panel, then the display panel is protected from damage, but the curvature radius control becomes difficult and flexibility is reduced
Solution Approach 1:
The adhesive layer is segmented into discrete adhesive dots rather than a continuous adhesive layer. This segmentation allows the protection film to maintain protection capability while improving flexibility and curvature radius control, as the discrete adhesive dots can accommodate bending without creating continuous stress that would restrict curvature.
Solution Approach 2:
The carrier film is treated to create local hydrophobic and hydrophilic regions, with adhesive dots positioned specifically in the hydrophobic regions. This local quality differentiation enables precise control of adhesion characteristics in different areas, allowing the film to maintain protection where needed while providing flexibility in other areas for curvature control.
2Strength
If the adhesive layer is made continuous to ensure strong adhesion, then adhesion strength is improved, but the protection film becomes rigid and curvature control becomes difficult
Solution Approach 1:
The continuous adhesive layer is divided into discrete adhesive dots arranged in a pattern. This segmentation maintains sufficient adhesion strength through concentrated bonding points while dramatically improving flexibility and curvature control by eliminating the continuous rigid structure that would restrict bending.
Solution Approach 2:
Instead of applying adhesive across the entire surface (excessive action), adhesive is applied only at specific discrete locations (partial action). This partial adhesion approach provides sufficient bonding strength for protection while leaving gaps that enable flexibility and curvature control.
3Adaptability or versatility
If the protection film is made more flexible to improve curvature control, then curvature radius control is improved, but the protection capability and adhesion strength are reduced
Solution Approach 1:
The carrier film surface is treated to create local hydrophobic and hydrophilic regions, with adhesive dots positioned in the hydrophobic regions. This local quality differentiation ensures that adhesion is concentrated at specific points where it is most needed for protection, while other regions maintain flexibility for curvature control.
Solution Approach 2:
The protection film uses a composite structure combining a carrier film with a patterned adhesive layer. The carrier film provides the flexible substrate for curvature control, while the discrete adhesive dots provide concentrated protection and adhesion, creating a composite system that achieves both flexibility and protection capability.
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 enables easy control of curvature radius and improved flexibility in display devices, reducing the risk of damage and enhancing manufacturing capabilities by absorbing impacts and maintaining adhesion during bending.
Implementation Method 1
an adhesive layer on the carrier film and including a plurality of adhesive dots separated from each other
Implementation Method 2
The carrier film may include a hydrophobic region and a hydrophilic region, and the plurality of adhesive dots may be at the hydrophobic region or the hydrophilic region
Data Source
AI summary
A flexible display device includes a protection film and a display panel, and the protection film includes a carrier film and an adhesive layer on the carrier film and including a plurality of adhesive dots separated from each other.