Display Window Module Replacement Using Hot Melt Adhesive
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Solution Overview
Problem
Display devices are prone to damage from external impacts, necessitating a method for simple and economical replacement of damaged window modules without harming the display panel.
Innovation Solution
A display device structure comprising a display panel, a thin glass layer, a hot melt adhesive layer, and functional films allows for the replacement of window modules by melting the adhesive layer to detach and reattach a new module, using adhesive layers with a melting temperature of 85°C or higher and optical transmittance of 80% or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a window module is damaged by external impact, then the display device requires replacement of the damaged layer, but conventional replacement methods may cause damage to the display panel
Solution Approach 1:
The window module is segmented into distinct layers (thin glass layer, functional films, hot melt adhesive layer) that can be independently replaced. The hot melt adhesive layer acts as a separable bonding interface, allowing the window module to be detached and reattached without damaging the display panel underneath.
Solution Approach 2:
The hot melt adhesive layer undergoes parameter changes through temperature control - it is heated above its melting point (85°C or higher) to become liquid for easy removal and reattachment, then cooled to solidify and bond the new window module to the display panel, enabling damage-free replacement.
2Strength
If the adhesive layer uses high melting temperature material (85°C or higher), then the bonding strength is improved, but the energy required for heating increases
Solution Approach 1:
The hot melt adhesive layer utilizes phase transition between solid and liquid states. Heating above 85°C melts the adhesive (solid to liquid transition) for easy detachment, and cooling below this temperature solidifies it for strong bonding, providing controllable bonding strength through temperature control.
3Illumination intensity
If the hot melt adhesive layer has high optical transmittance (80% or higher), then the image quality is maintained, but the adhesive performance may be compromised
Solution Approach 1:
The hot melt adhesive layer is formulated as a composite material that simultaneously achieves high optical transmittance (80% or higher) for maintaining image quality and sufficient adhesive performance through its molecular structure and bonding mechanisms, resolving the trade-off between optical and mechanical 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
Enables easy and cost-effective replacement of damaged window modules, protecting the display panel and maintaining image quality.
Implementation Method 1
heating a display device including a display panel, a window module, and a first hot melt adhesive layer, which bonds the display panel and the window module, to melt the first hot melt adhesive layer
Implementation Method 2
The second hot melt adhesive layer is consolidated to bond the display panel and the new window module
Data Source
AI summary
A display device includes a display panel, a thin glass layer disposed on the display panel, a hot melt adhesive layer disposed between the display panel and the thin glass layer, and a functional film disposed between the hot melt adhesive layer and the thin glass layer.