Electrophoretic Display Panel Sealing Using Low-Surface-Energy Additive
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Solution Overview
Problem
Existing flexible electrophoretic display panels suffer from insufficient bonding strength at liquid-liquid interfaces, leading to instability and complex packaging structures due to weak adhesive forces between the dams and the sealing layer.
Innovation Solution
Incorporating a first additive with a surface energy lower than the electrophoretic medium into the sealing layer and electrophoretic medium, enhancing the interface bonding strength by forming a centrally raised interface and increasing the contact area between the sealing layer and dams, and utilizing chemical reactions to form bonding layers and hardened layers for improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive materials are used between the sealing layer and dams, then the packaging structure can be maintained, but the bonding strength at liquid-liquid interfaces is insufficient
Solution Approach 1:
The patent changes the surface energy parameter of the electrophoretic medium by adding a low surface energy additive, which modifies the interfacial properties between the sealing layer and the electrophoretic medium. This parameter change enables stronger bonding at the liquid-liquid interface without requiring complex packaging structures.
Solution Approach 2:
The low surface energy additive acts as an intermediary substance that mediates the bonding between the sealing layer and the electrophoretic medium. By introducing this intermediary component with specific surface energy properties, the adhesive force is enhanced while maintaining a simple packaging structure.
2Reliability
If the adhesive force to dams is weak, then the packaging structure remains simple, but the weather fastness and sealability are compromised
Solution Approach 1:
By changing the surface energy parameter of the electrophoretic medium through additive incorporation, the patent achieves improved weather fastness and sealability while maintaining a simple packaging structure. The parameter modification directly enhances interfacial bonding without requiring structural complexity.
Solution Approach 2:
The patent creates a composite electrophoretic medium by combining the base medium with a low surface energy additive. This composite material provides both the desired bonding properties for weather fastness and the simplicity of the original structure, avoiding the need for complex packaging designs.
3Strength
If a low surface energy additive is added to the electrophoretic medium, then the bonding strength between sealing layer and dams is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent modifies the electrophoretic medium by adjusting its surface energy parameter through additive incorporation. This parameter change improves interface bonding strength while the manufacturing process remains relatively simple, as it only requires mixing the additive into the electrophoretic medium before assembly.
Solution Approach 2:
The low surface energy additive is incorporated into the electrophoretic medium in advance, before the assembly process. This preliminary action ensures that the bonding properties are already optimized when the sealing layer is formed, simplifying the overall manufacturing process by avoiding post-assembly bonding adjustments.
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 significantly enhances the bonding strength between the sealing layer and electrophoretic display layer, improving the sealability and structural reliability of flexible packaging without affecting the display performance.
Implementation Method 1
a surface energy of the first additive is less than a surface energy of the electrophoretic medium
Implementation Method 2
utilizing chemical reactions to form bonding layers and hardened layers for improved adhesion
Data Source
AI summary
Provided are a display panel and a display apparatus including the same. The display panel includes: a first substrate and a second substrate provided opposite to each other; an electrophoretic display layer located between the first substrate and the second substrate, where the electrophoretic display layer includes dams and accommodating cavities defined by the dams, and an electrophoretic medium is provided in the accommodating cavities; and a sealing layer located between the electrophoretic display layer and the first substrate; where the electrophoretic medium includes a first additive, and a surface energy of the first additive is less than a surface energy of the electrophoretic medium. In the display panel and the display apparatus, the adhesive force of the sealing layer to the dams can be increased, improving a bonding strength of liquid-liquid interface contact, which is conducive to improving the sealability of flexible packaging.