Organic EL Sealing Adhesive Pattern for Bubble-Free Lamination
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Solution Overview
Problem
Conventional methods for sealing organic electroluminescence (EL) elements, such as the dropping of hardening resin onto substrates, often result in bubble formation and moisture ingress, leading to reduced display quality and reliability due to the creation of closed spaces, which impede uniform adhesive spreading and increase the distance between substrates, affecting color chromaticity and yield.
Innovation Solution
A method involving the application of an adhesive in a shape with straight line portions and protruding segments on one substrate, allowing it to spread and push out spaces during pressing, preventing bubble formation and ensuring uniform sealing without closed spaces, thereby maintaining the desired distance between substrates for optimal display quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hardening resin in liquid form is dropped onto a substrate to seal organic EL elements, then sealing is achieved, but bubbles are created and display quality deteriorates
Solution Approach 1:
The adhesive is applied in a predetermined pattern (straight line portions and protruding portions) before sealing, allowing air to be pushed out systematically rather than trapped randomly. This preliminary arrangement of adhesive prevents bubble formation during the sealing process.
Solution Approach 2:
The adhesive application pattern is segmented into straight line portions and protruding portions, creating a structured approach to adhesive distribution. This segmentation allows controlled air evacuation paths while maintaining uniform sealing.
2Reliability
If adhesive is applied to seal organic EL elements, then sealing is achieved, but closed spaces are created that trap moisture and reduce reliability
Solution Approach 1:
The adhesive pattern is designed in advance with straight line and protruding portions that create open structures rather than closed spaces. This preliminary design ensures moisture cannot be trapped in bubbles, maintaining reliability while providing protection.
3Ease of manufacture
If conventional adhesive dropping is used, then sealing process is simple, but uniform adhesive spreading is impeded and substrate distance becomes non-uniform
Solution Approach 1:
The adhesive is applied in a predetermined pattern before sealing, establishing uniform spacing and spreading characteristics in advance. This preliminary pattern ensures uniform substrate distance while maintaining process simplicity.
Solution Approach 2:
The adhesive application features local variations (protruding portions vs. straight line portions) that serve different functions: protruding portions push out air while straight line portions maintain uniform spacing. This local differentiation achieves uniform substrate distance.
Data Source
AI summary
An adhesive is applied in a shape having a straight line portion and protruding portions protruding in the direction crossing the straight line portion to the surface of one of a first substrate where organic electroluminescence elements have been formed and a second substrate for sealing the organic electroluminescence elements, and the first and second substrates are pressed together in such a manner that the first and second substrates face and approach each other, and thereby, the adhesive is spread between the first and second substrates so that the organic electroluminescence elements are sealed.