Moisture Impermeable Layer in Liquid Crystal Display Sealant
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Solution Overview
Problem
Liquid crystal display devices with reduced frame widths face challenges in maintaining durability and preventing water penetration due to the limitations of conventional sealants, which have low moisture permeability but cannot completely shield against water, especially when the frame width is minimized.
Innovation Solution
The implementation of a moisture impermeable layer between the resin layer and the sealant, ensuring that the end portion of the resin layer is not exposed to the outside atmosphere, and the sealant overlaps with the resin layer, providing additional protection against water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the frame width is reduced to meet market demand for smaller displays, then the device size is reduced and portability is improved, but the sealing region width is reduced making it difficult to secure sufficient protection against water penetration
Solution Approach 1:
The invention transitions from a single-layer sealant structure to a multi-layer structure by adding a resin layer above the sealant. This dimensional addition creates overlapping regions where the resin layer extends beyond the sealant edges, providing water resistance in a new spatial dimension without increasing the overall frame width.
Solution Approach 2:
The invention combines multiple materials with different properties: the sealant provides primary sealing and moisture resistance, while the resin layer adds supplementary protection and structural support. This composite structure achieves enhanced water resistance that neither material could provide alone in a reduced frame width configuration.
2Device complexity
If a single-layer sealant structure is used to simplify manufacturing, then the device complexity is reduced, but the water penetration protection is insufficient when frame width is minimized
Solution Approach 1:
The sealing function is segmented into two distinct layers: the sealant layer for primary sealing and the resin layer for supplementary protection. This segmentation allows each layer to be optimized for its specific function while working together to provide comprehensive water resistance.
Solution Approach 2:
The resin layer is formed to extend beyond the sealant edges before final assembly, creating a pre-positioned protective barrier. This preliminary action ensures that water is blocked at multiple points before it can reach critical internal components.
Data Source
AI summary
An active matrix liquid crystal display device including a counter substrate and an element substrate firmly attached with each other with a sealant, and a liquid crystal layer between the counter substrate and the element substrate is provided. The counter substrate is provided with at least a resin layer. An outer end portion of the resin layer is not exposed to the outside atmosphere. The resin layer and the sealant at least partly overlap with each other when seen from a cross section of the liquid crystal display device. A moisture impermeable layer is formed between the resin layer and the sealant.