Rollable Display Adhesive with Local Modulus Control
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Solution Overview
Problem
Rollable display devices face deformation issues due to stress applied during folding or rolling, which can damage the display panel and deteriorate display quality.
Innovation Solution
A display device design featuring a supporter with metal layers spaced apart, surrounded by a cushion layer, and an adhesive layer with distinct modulus areas, where the second area not overlapping the metal layers has a higher modulus than the first area, preventing deformation during rolling by increasing the strength of the adhesive layer through UV irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive layer has uniform modulus throughout, then the manufacturing process is simple, but the display panel deforms during rolling due to insufficient stress resistance in certain areas
Solution Approach 1:
The adhesive layer is designed with different moduli in different areas: the first area (overlapping metal layers) has lower modulus for flexibility, while the second area (between metal layers) has higher modulus for stress resistance. This local differentiation allows each region to perform its specific function optimally without requiring a completely complex multi-layer structure.
Solution Approach 2:
The adhesive layer is segmented into distinct first and second areas with different mechanical properties. The first area provides flexibility where metal layers are present, while the second area provides enhanced strength in the gaps between metal layers, preventing deformation during rolling operations.
2Stability of the object's composition
If the adhesive layer has high modulus throughout to prevent deformation, then the display panel maintains shape stability, but the flexibility required for rolling is reduced
Solution Approach 1:
Different regions of the adhesive layer have different moduli tailored to local requirements: the second area (between metal layers) has high modulus to maintain shape stability and prevent deformation, while the first area (overlapping metal layers) has lower modulus to allow flexibility and enable rolling operations.
Solution Approach 2:
The adhesive layer is divided into functional segments where the first area enables flexibility for rolling by having lower modulus, while the second area ensures shape stability by having higher modulus, thus simultaneously achieving both stability and adaptability.
3Reliability
If the modulus difference between first and second areas of adhesive layer is large (2-10 times), then deformation prevention is effective, but the manufacturing precision required to achieve this modulus difference increases
Solution Approach 1:
The modulus of the adhesive layer is controlled through parameter changes in the curing process. By adjusting UV irradiation conditions, temperature, or curing time in different areas, the patent achieves a modulus difference of 2-10 times between the first and second areas, effectively preventing deformation while maintaining feasible manufacturing precision.
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 effectively prevents deformation of the display device during the rolling process, maintaining display quality by ensuring the adhesive layer's modulus is enhanced in areas prone to deformation, thereby reducing stress on the display panel.
Implementation Method 1
curing a portion of the adhesive layer by irradiating ultraviolet irradiation from a surface of the supporter
Data Source
AI summary
A display device includes a display panel; a supporter disposed on a surface of the display panel; and an adhesive layer disposed between the supporter and the display panel, wherein the supporter includes metal layers spaced apart from each other; and a cushion layer surrounding the metal layers, the adhesive layer includes a first area overlapping the metal layers in a vertical direction to the display panel; and a second area not overlapping the metal layers in the vertical direction to the display panel, and a modulus of the second area of the adhesive layer is larger than a modulus of the first area of the adhesive layer.