Electro-optical Device Dual Seal Member Moisture Protection
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Solution Overview
Problem
Existing electro-optical devices face challenges in preventing moisture intrusion due to the limitations of current seal member configurations, which lead to degradation of the electro-optical material, particularly when using inorganic encapsulating layers and desiccants like silica gel micropowder or porous silicon oxide, as these methods either fail to effectively block moisture or increase the viscosity of the seal member, making proper application difficult.
Innovation Solution
The electro-optical device incorporates a second seal member with a specific composition of first and second particles of different diameters, where the first particles are located between the substrates and the second particles are on the outer side, increasing the migration distance of moisture and preventing its intrusion, along with an inorganic layer covering the exposed surface of the second seal member to further suppress moisture entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic encapsulating layer is formed on the second seal member, then moisture permeation is blocked, but moisture can still reach the internal area through the seal member once the encapsulating layer is permeated
Solution Approach 1:
The patent employs a composite seal member comprising a resin-based material mixed with inorganic particles (such as silica gel micropowder or porous silicon oxide). This composite structure provides both the flexibility of the resin and the moisture-blocking properties of the inorganic particles, creating an effective moisture barrier without requiring a separate encapsulating layer
Solution Approach 2:
The patent utilizes porous inorganic particles (silica gel micropowder or porous silicon oxide) dispersed within the resin-based seal member. These porous materials provide hygroscopic effects to absorb moisture and create a tortuous path that increases moisture migration distance, effectively blocking moisture permeation through the seal member
2Reliability
If silica gel micropowder or porous silicon oxide is added to the seal member, then moisture absorption is enhanced, but the seal member viscosity increases making application difficult
Solution Approach 1:
The patent carefully controls the particle size, shape, and concentration of the inorganic filler particles to optimize the balance between moisture absorption capability and seal member viscosity. By adjusting these parameters, the patent achieves effective moisture protection while maintaining manageable viscosity for proper application
Solution Approach 2:
The patent distributes the inorganic particles non-uniformly within the resin-based seal member, concentrating them in regions where moisture absorption is most critical while maintaining lower concentrations in areas where viscosity control is paramount. This localized distribution optimizes both moisture protection and applicability
3Reliability
If a high ratio of filler is used in the seal member, then moisture protection is improved, but the viscosity increases making it difficult to apply the seal member
Solution Approach 1:
The patent optimizes the filler-to-resin ratio and particle size distribution to achieve the minimum effective filler content that provides adequate moisture protection while keeping viscosity within manageable limits for application. This parameter optimization resolves the contradiction between protection effectiveness and applicability
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
This configuration effectively prevents moisture intrusion into the electro-optical device, thereby reducing material degradation and maintaining the seal member's viscosity at a manageable level, facilitating easier application without the need for excessive filler content.
Implementation Method 1
moisture is prevented from permeating through the second seal member because the particles contained therein serve to increase the migration distance of moisture
Implementation Method 2
an inorganic layer covering the exposed surface of the second seal member to further suppress moisture entry
Data Source
AI summary
In an electro-optical device, an electro-optical material is doubly sealed with a first seal member and a second seal member. In the second seal member, first particles are located in a gap between a first substrate and a second substrate, and second particles are located outside of the gap between the first substrate and the second substrate, so as to cover the opening of the gap.