Resin Composition for Display Adhesive Cleanability
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Solution Overview
Problem
Current display apparatuses face challenges in achieving improved cleanability to ethanol and compatibility with optically clear resins, particularly in the adhesive layers used between the display panel and the cover window, which affects their durability and reliability.
Innovation Solution
A resin composition is developed that includes specific weight ratios of acrylamide-based, ester-based, and acrylate-based compounds, along with an initiator, which are used in the second adhesive layer to enhance the adhesive properties and compatibility with ethanol, while the first adhesive layer has a lower Young's modulus for stress relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single adhesive layer with high adhesive strength is used, then bonding strength between display panel and cover window is improved, but cleanability to ethanol deteriorates and compatibility with optically clear resin is reduced
Solution Approach 1:
The adhesive member is divided into two distinct adhesive layers: a first adhesive layer in contact with the display panel and a second adhesive layer in contact with the cover window. Each layer has different compositional characteristics - the first layer prioritizes adhesive strength with higher content of acrylamide-based compound and ester-based compound, while the second layer prioritizes cleanability to ethanol with higher content of acrylate-based compound. This segmentation allows each layer to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the adhesive member (first adhesive layer vs. second adhesive layer) are assigned different material compositions tailored to their specific functional requirements. The first adhesive layer near the display panel has composition optimized for bonding strength, while the second adhesive layer near the cover window has composition optimized for ethanol cleanability and OCR compatibility, creating local quality variations throughout the adhesive structure.
2Strength
If adhesive layer with high crosslinking density is used, then adhesive strength and impact resistance are improved, but compatibility with optically clear resin deteriorates
Solution Approach 1:
The adhesive member is segmented into two layers with different crosslinking densities. The first adhesive layer has higher crosslinking density achieved through higher content of acrylamide-based compound and ester-based compound, providing superior adhesive strength. The second adhesive layer has lower crosslinking density with higher content of acrylate-based compound, ensuring compatibility with optically clear resin and preventing yellowing or degradation.
Solution Approach 2:
The adhesive member functions as a composite material system where two different adhesive compositions are layered together. This composite structure combines the advantages of high crosslinking density materials (strength, impact resistance) with low crosslinking density materials (OCR compatibility, optical clarity), achieving overall performance that neither single material could provide alone.
3Strength
If thick adhesive layer is used, then stress relief and impact resistance are improved, but manufacturing precision and optical quality deteriorate
Solution Approach 1:
The thick adhesive layer is segmented into two functional sub-layers. The first adhesive layer (thicker, 30-80 μm) provides stress relief and impact resistance through its composition and thickness. The second adhesive layer (thinner, 5-30 μm) maintains optical quality by being thin enough to minimize optical interference while still providing adequate bonding to the cover window. This segmentation allows the overall adhesive member to be thick for strength while maintaining optical precision.
Solution Approach 2:
The solution transitions from a single-dimensional (uniform thickness) adhesive layer to a two-dimensional (graded thickness) structure where thickness varies by function. The first adhesive layer is positioned closer to the display panel with greater thickness for mechanical support, while the second adhesive layer is positioned closer to the cover window with lesser thickness for optical quality, creating a thickness gradient that optimizes both strength and optical properties.
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 resin composition improves the cleanability to ethanol, maintains compatibility with optically clear resins, and enhances the impact resistance and durability of the display apparatus by optimizing the adhesive properties and layer thickness.
Implementation Method 1
a resin composition including an acrylamide-based compound, an ester-based compound, an acrylate-based compound, and an initiator
Data Source
AI summary
Provided is a display apparatus including a display panel having a display element therein, a cover window on the display panel, and an adhesive member between the display panel and the cover window and including a first adhesive layer and a second adhesive layer on the first adhesive layer, wherein the second adhesive layer includes a resin composition including an acrylamide-based compound, an ester-based compound, an acrylate-based compound, and an initiator, the ester-based compound including a first ester-based compound and a second ester-based compound, the first ester-based compound including a heterocycloalkyl group, and the second ester-based compound including an aryl group, and the acrylate-based compound including a urethane acrylate-based compound, a first acrylate-based compound, and a second acrylate-based compound, the first acrylate-based compound including a bicyclic compound, and the second acrylate-based compound including a linear alkyl group.