Alternating Sealant Segments for OLED Encapsulation Adhesion
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Solution Overview
Problem
Display devices, such as OLEDs, face issues with reduced lifespan and deteriorated light emission efficiency due to moisture and oxygen ingress, which can lead to electrode oxidation and peeling, affecting adhesion reliability and overall strength.
Innovation Solution
A display device design featuring a sealant with alternating expanded and non-expanded parts around the edges of the encapsulation substrate, ensuring strong adhesion without overlapping the voltage transmission electrode to prevent defects and enhance sealing, thereby improving the strength and reliability of the sealing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealant is applied continuously around the encapsulation substrate to ensure complete sealing, then the sealing effectiveness is improved, but the adhesion reliability deteriorates due to electrode oxidation and peeling
Solution Approach 1:
The sealant is divided into multiple segments alternating between expanded parts and non-expanded parts around the encapsulation substrate. This segmentation allows the sealant to provide complete sealing coverage while creating spacing that prevents electrode oxidation and peeling, thus resolving the contradiction between sealing effectiveness and adhesion reliability.
2Strength
If the sealant width is increased to improve sealing strength, then the adhesion reliability is improved, but the bezel area increases
Solution Approach 1:
The sealant is segmented into alternating expanded and non-expanded parts, which allows the sealing function to be distributed across multiple segments rather than requiring a single wide continuous sealant. This maintains sealing strength while reducing the overall bezel area.
Solution Approach 2:
The sealant has different widths at different locations: expanded parts provide strong adhesion and sealing where needed, while non-expanded parts reduce the overall bezel area. This local variation in quality resolves the contradiction between sealing strength and bezel area.
3Reliability
If the sealant is applied to cover the voltage transmission electrode to ensure complete sealing, then the sealing effectiveness is improved, but electrode defects occur due to oxidation and peeling
Solution Approach 1:
The sealant is segmented into alternating expanded and non-expanded parts, creating spacing that prevents the sealant from completely covering the voltage transmission electrode. This segmentation allows sealing effectiveness while preventing electrode oxidation and peeling by avoiding direct contact between the sealant and electrode in certain areas.
Data Source
AI summary
A display device includes: a lower substrate including a display area including a plurality of pixels and peripheral areas around the display area; an encapsulation substrate facing the lower substrate, and including a plurality of edges facing different directions; a sealant between the lower substrate and the encapsulation substrate, the sealant being at the peripheral areas; a voltage transmission line at the peripheral area and being configured to transmit a common voltage; and a voltage transmission electrode at the peripheral area and connected to the voltage transmission line to form at least one contact part, in which the sealant includes a first expanded part and a first non-expanded part having a smaller width than a width of the first expanded part, and the contact part and the first expanded part are alternately arranged.