Cover Panel Bonding Layout for Thermal-Stress Display Supports
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Solution Overview
Problem
Existing transmissive liquid crystal display devices face challenges in maintaining the cover panel securely attached to the support, particularly due to differences in thermal expansion and stress concentrations at the junctions, leading to potential peeling and cracking of the adhesive.
Innovation Solution
A display device design featuring a support structure with adhesive tape and adhesive placement that strategically avoids stress-prone areas, utilizing a thermoplastic adhesive on long side portions and adhesive tape on short side portions to enhance bonding strength and prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is provided between the short side portions and the cover panel, then bonding strength is improved, but stress concentration causes adhesive peeling and cracking
Solution Approach 1:
The patent extracts the adhesive from the short side portions where it would cause harm, while maintaining adhesive on the long side portions where it provides benefit. This selective removal eliminates stress concentration and peeling at the short sides without compromising overall bonding strength.
Solution Approach 2:
The patent applies different adhesive configurations to different regions: adhesive is provided on the long side portions for strong bonding, while deliberately omitted from the short side portions to avoid stress concentration. This local differentiation optimizes both bonding strength and reliability.
2Strength
If adhesive tape and adhesive are provided on all side portions, then bonding strength is improved, but thermal expansion differences cause stress concentration
Solution Approach 1:
The patent converts the harmful effect of thermal expansion differences into a beneficial design by identifying which regions (short sides) are most susceptible to stress and deliberately excluding adhesive from those regions, while maintaining adhesive on regions (long sides) less affected by thermal stress.
3Strength
If adhesive is provided between the long side portions and the cover panel, then bonding strength is improved, but stress concentration may occur at junctions
Solution Approach 1:
The patent segments the adhesive application into two distinct regions: long side portions where adhesive is provided for bonding, and short side portions where adhesive is omitted to avoid stress. This segmentation allows the system to achieve both strong bonding and reduced stress concentration.
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 reduces the likelihood of adhesive peeling and cracking by distributing adhesive application to minimize stress concentrations, ensuring the cover panel remains securely attached to the support.
Implementation Method 1
an adhesive tape and an adhesive bonding the cover panel to the support
Data Source
AI summary
A display device includes a cover panel having a display area and a peripheral area that differs from the display area, a display panel facing at least the display area of the cover panel, a support having a plurality of side walls that support the peripheral area of the cover panel, and an adhesive tape and an adhesive bonding the cover panel to the support. The side walls of the support are rectangular having a pair of long side portions provided along a long side and a pair of short side portions provided along a short side, the adhesive tape and the adhesive are provided between the long side portions and the cover panel, and the adhesive tape is provided and the adhesive is not provided between the short side portions and the cover panel.