Display Device Adhesive Structure for Air Penetration Prevention
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Solution Overview
Problem
Conventional display devices face issues with adhesive detachment due to material property differences, leading to cover plate separation and air penetration, which deteriorates image quality.
Innovation Solution
A display device design featuring a back plate, display panel, elastic layer, light guide plate, and adhesive layer with a main body portion and edge reinforcing portion, where the adhesive layer uses adhesive bodies with different adhesion and an edge reinforcing portion to enhance bonding strength and prevent air penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive bodies with different materials are used to bond the cover plate and display panel, then the bonding strength is improved, but the adhesive bodies are easily partially detached with temperature changes
Solution Approach 1:
The adhesive layer is designed with different adhesion properties in different regions: the first adhesive body has lower adhesion to accommodate thermal expansion differences, while the second adhesive body has higher adhesion to ensure strong bonding. This local differentiation resolves the contradiction by allowing each region to perform its specific function optimally under temperature changes.
Solution Approach 2:
The adhesive layer combines multiple adhesive bodies with different material properties to create a composite adhesive structure. This composite design allows the adhesive layer to simultaneously provide strong bonding and accommodate thermal stress, resolving the contradiction between bonding strength and detachment resistance.
2Strength
If the cover plate is firmly fixed to prevent detachment, then the bonding strength is improved, but external air easily penetrates into the adhesive body
Solution Approach 1:
The elastic layer acts as a flexible sealing element between the cover plate and display panel. It maintains the sealing effect while accommodating thermal expansion, preventing air penetration without compromising bonding strength. The elastic layer's flexibility allows it to adapt to dimensional changes while maintaining the barrier function.
3Object-affected harmful factors
If the adhesive layer is tightly compressed to prevent air penetration, then the sealing performance is improved, but the adhesive bodies with different adhesion properties experience stress concentration
Solution Approach 1:
The adhesive layer is designed with different adhesion properties in different regions: the first adhesive body has lower adhesion to accommodate thermal expansion differences, while the second adhesive body has higher adhesion to ensure strong bonding. This local differentiation resolves the contradiction by allowing each region to perform its specific function optimally under temperature changes.
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 air penetration and improves image quality by tightly sandwiching the adhesive layer between the light guide plate and cover plate, enhancing bonding strength and quickly expelling air, thereby improving product yield.
Implementation Method 1
The elastic layer is compressed between the back plate and the display panel. The compressed elastic layer is able to push against the light guide plate to be tightly against the adhesive layer
Implementation Method 2
The adhesive layer is disposed between the light guide plate and the cover plate, wherein the adhesive layer includes a main body portion and an edge reinforcing portion
Data Source
AI summary
A display device includes a back plate, a display panel, an elastic layer, a light guide plate, a cover plate and an adhesive layer. The display panel is opposite to an installing surface of the back plate. The elastic layer is compressed between the back plate and the display panel. The light guide plate is between the elastic layer and the adhesive layer. The adhesive layer is between the light guide plate and the cover plate, and includes a main body portion and an edge reinforcing portion surrounding the main body portion and connected to the light guide plate and the cover plate. The main body portion includes a first adhesive body disposed on the light guide plate and a second adhesive body stacked on the first adhesive body and the cover plate. An adhesion of the first adhesive body is different from an adhesion of the second adhesive body.