Electrophoretic Display Double-Layer Sealant Waterproofing
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Solution Overview
Problem
Conventional electrophoretic display structures lack effective waterproofing, allowing water vapor infiltration during assembly, and high viscosity sealants fail to fill gaps properly, leading to bubble or hole formations.
Innovation Solution
A double-layered sealant structure is introduced, with a first sealant of lower viscosity filling the gaps between the activation and protective layers and a second sealant of higher viscosity covering the outer side, forming a frame-like structure to prevent water vapor infiltration, where the water vapor transmission rate of the first sealant is higher than the second sealant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low viscosity sealant is used, then the gap can be easily filled, but water vapor infiltration occurs
Solution Approach 1:
The sealant is divided into two distinct layers with different viscosities and functions. The first layer (lower viscosity) fills the gap between the electrophoretic display layer and protective layer, while the second layer (higher viscosity) provides the waterproof sealing function. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The solution uses a composite sealant structure combining two materials with different properties. The first sealant material has lower viscosity for easy gap filling, while the second sealant material has higher viscosity for effective waterproofing. This composite approach resolves the contradiction by integrating the advantages of both material types into a single sealing system.
2Reliability
If high viscosity sealant is used, then waterproofing ability is improved, but the gap cannot be easily filled and bubbles form
Solution Approach 1:
The sealing process is segmented into two sequential steps: first applying the lower viscosity sealant to fill the gap, then applying the higher viscosity sealant for waterproofing. This eliminates the need to choose between the two conflicting properties in a single material application.
Solution Approach 2:
The lower viscosity sealant is applied first as a preliminary action to fill the gap and remove air bubbles before the higher viscosity waterproofing sealant is applied. This preliminary filling action prepares the structure for the subsequent waterproofing step, ensuring no bubbles are trapped.
3Device complexity
If single layer sealant is used, then device complexity is reduced, but both gap filling and waterproofing cannot be achieved simultaneously
Solution Approach 1:
The sealant function is segmented into two distinct layers, each with specific viscosity ranges and functions. This segmentation is necessary to simultaneously achieve both gap filling and waterproofing, as a single layer cannot optimize both properties.
Solution Approach 2:
Different regions of the sealant structure have different qualities: the first layer has lower viscosity suited for gap filling, while the second layer has higher viscosity suited for waterproofing. This local differentiation of material properties allows each region to perform its specific function optimally.
Data Source
AI summary
An electrophoretic display structure includes a substrate, an activation layer, an electrophoretic display layer, a protective layer, a first sealant, and a second sealant. The activation layer is disposed on the substrate while the electrophoretic display layer is disposed on the activation layer. The electrophoretic display layer has a plurality of electrophoretic display elements and a waterproof layer disposed on the electrophoretic display elements. The protective layer is disposed on the electrophoretic display elements. The protective layer is disposed on the waterproof layer, and the first sealant is disposed between the activation layer and the protective layer to fill in the sides of the electrophoretic display layer. The second sealant covers the outer side of the first sealant and connects with the activation layer and the protective layer. The viscosity of the first sealant in liquid state is lower than the viscosity of the second sealant in liquid state.