Protective Member Shrinkage for Curved Display Corner Adhesion
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Solution Overview
Problem
Display devices experience adhesion failure and buckling defects at corners due to deformation and curvature, leading to cracks and disconnections.
Innovation Solution
A display device design incorporating a protection member with specific material properties, including a contraction rate of 20% or more and an elastic modulus of 4 GPa or less in a temperature range of 50 to 150 degrees Celsius, is used to prevent adhesion failure and buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a protection member with high rigidity is used to maintain structural stability, then structural stability is improved, but adhesion failure occurs at corners due to inability to accommodate deformation
Solution Approach 1:
The protection member uses a polymer material with specific mechanical parameters: elastic modulus of 4 GPa or less and contraction rate of 20% or more at glass transition temperature. This parameter optimization allows the material to be rigid enough for structural stability while flexible enough to accommodate corner deformation and maintain adhesion.
Solution Approach 2:
The protection member is designed to attach to all surfaces including front surface, side surfaces, and corner sections. The material properties enable different regions to respond differently to stress - maintaining rigidity on flat surfaces while accommodating deformation at curved corner sections, thus preventing adhesion failure at critical locations.
2Reliability
If the protection member has high contraction rate to relieve strain at corners, then adhesion reliability is improved, but structural stability deteriorates
Solution Approach 1:
The elastic modulus is controlled at 4 GPa or less and contraction rate at 20% or more within the glass transition temperature range. This balanced parameter selection ensures the protection member can contract sufficiently to relieve corner strain while maintaining enough structural integrity for overall stability.
3Reliability
If the elastic modulus is reduced to prevent adhesion failure, then adhesion reliability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The specific elastic modulus range (4 GPa or less) and contraction rate (20% or more) at glass transition temperature provide predictable material behavior during manufacturing. This allows precise control of the attachment process while ensuring the protection member maintains sufficient rigidity for 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 solution effectively prevents adhesion failure and buckling defects, maintaining the structural integrity of the display panel by relieving strain at corners with double curvatures.
Implementation Method 1
a protection member disposed under the display area of the display panel, wherein the protection member has an elastic modulus of 4 GPa or less in a range of glass transition temperature, and a contraction rate of 20% or more in a temperature range of 50 to 150 degrees Celsius
Implementation Method 2
the protection member has an elastic modulus of 4 GPa or less in a range of glass transition temperature
Data Source
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AI summary
A display device according to an embodiment of the present invention comprises: a display panel including a display area; a cover window disposed on the display panel; and a protective member disposed under the display area of the display panel, wherein the protective member has an elastic modulus of 4 GPa or less in a glass transition temperature range, and has a shrinkage rate of 20% or more in a temperature range of 50 degrees to 150 degrees.