OLED Adhesive Layers with Reinforcing Particles for Folding Stress
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays face challenges in maintaining hardness and flexibility when folded, as the adhesive layers deform under stress, leading to reduced durability and potential damage.
Innovation Solution
Incorporating reinforcing materials such as transparent silicon beads or column spacers in the adhesive layers, specifically in non-folding areas, to enhance the hardness and minimize deformation due to folding stress, while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive layers are used to bond flexible panels together in an OLED display, then the display can be assembled with multiple functional layers, but the adhesive layers deform under folding stress leading to reduced durability
Solution Approach 1:
The adhesive layer is formed as a composite material by combining an adhesive resin with inorganic particles (such as silica, alumina, or boehmite particles with 0.1-10 μm diameter). This composite structure provides both the bonding capability of the adhesive and the mechanical reinforcement of the particles, enabling the adhesive layer to withstand folding stress while maintaining its bonding function between flexible panels
Solution Approach 2:
The viscosity of the adhesive resin is controlled within a specific range (10-1000 cP at 25°C) to optimize both the bonding performance and the ability to maintain structural integrity under stress. Additionally, the particle content is controlled at 1-50 wt% of the adhesive resin to provide sufficient reinforcement without compromising the adhesive's flexibility and bonding capability
2Adaptability or versatility
If the OLED display is made flexible to enable folding, then the display can be deformed into various shapes, but the adhesive layers lose hardness and deform under stress
Solution Approach 1:
Inorganic particles (silica, alumina, or boehmite) with 0.1-10 μm diameter are dispersed within the adhesive resin to create a composite adhesive layer. These particles act as reinforcing agents that maintain the hardness and structural stability of the adhesive layer even when the overall display structure is folded, while the adhesive resin maintains flexibility to accommodate the folding motion
Solution Approach 2:
The adhesive layer exhibits different properties at different scales: at the macro level, the adhesive layer remains flexible to allow folding; at the micro level, the inorganic particles provide localized hardness and stress distribution to prevent deformation and maintain structural integrity during folding operations
Data Source
AI summary
An organic light emitting diode display, which is foldable about a folding central axis, and in which a folding area including the folding central axis and a non-folding area except for the folding area are defined, the organic light emitting diode display including a first panel having flexibility; a second panel on the first panel and having flexibility; a third panel on the second panel and having flexibility; a first adhesive layer between the first panel and the second panel to bond the first panel and the second panel to each other; and a second adhesive layer between the second panel and the third panel to bond the second panel and the third panel to each other, wherein at least one of the first adhesive layer and the second adhesive layer includes a first reinforcing material.