Protective Member Adhesive Stack for Curved Display Cut-Outs
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Solution Overview
Problem
Display devices with corner portions subjected to double curvature experience high strain, leading to potential lifting or unfilled defects in cut-out portions due to stress concentration.
Innovation Solution
A display device design incorporating a protective member with adhesive layers of varying creep characteristics and complementary shapes to fill the cut-out portions, ensuring secure adhesion and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single adhesive layer is used to bond the protective member to the display panel, then the structure is simple, but lifting or unfilled defects occur in cut-out portions due to stress concentration in corner portions
Solution Approach 1:
The adhesive layer is divided into multiple layers (first adhesive layer and second adhesive layer) with different creep characteristics. The first adhesive layer has lower creep and provides strong initial bonding, while the second adhesive layer has higher creep and fills cut-out portions effectively, preventing lifting defects
Solution Approach 2:
Different regions of the adhesive system are assigned different properties: the first adhesive layer uses a composition with lower creep for general bonding areas, while the second adhesive layer uses a composition with higher creep specifically for cut-out portions where stress concentration occurs, providing localized stress relief and filling
2Manufacturing precision
If adhesive layers with high creep characteristic are used to fill cut-out portions, then filling effectiveness improves, but adhesive force to the protective member decreases
Solution Approach 1:
The adhesive system is segmented into two layers with different creep characteristics. The second adhesive layer with higher creep fills the cut-out portions effectively, while the first adhesive layer with lower creep provides strong bonding to the protective member, thus both filling effectiveness and adhesive strength are achieved
Solution Approach 2:
The adhesive system uses a composite structure of two different adhesive compositions. The first coupling composition (first adhesive layer) provides strong adhesion to the protective member, while the second coupling composition (second adhesive layer) provides high creep for effective filling of cut-out portions, creating a composite adhesive system that combines both 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 solution prevents lifting or unfilled defects in the cut-out portions, securing adhesive force and enhancing visibility by filling the space effectively.
Implementation Method 1
The second adhesive layer has a creep characteristic greater than that of the first adhesive layer
Implementation Method 2
An adhesive force of the first coupling composition to the protective member is greater than an adhesive force of the second coupling composition to the protective member
Data Source
AI summary
A display device includes a display panel. A protective member is disposed below the display panel. A first adhesive layer is disposed on an upper surface of the protective member. The first adhesive layer includes a first coupling composition. A second adhesive layer is at least partially disposed between an upper surface of the first adhesive layer and a lower surface of the display panel. The second adhesive layer includes a second coupling composition different from the first coupling composition. The second adhesive layer has a creep characteristic greater than that of the first adhesive layer. An adhesive force of the first coupling composition to the protective member is greater than an adhesive force of the second coupling composition to the protective member.