Display Dam Structure for Blocking Filler-Curing Air Bubbles
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Solution Overview
Problem
Existing display devices face issues with air bubbles forming in the peripheral area during the curing of the filler, which can lead to lifting of the common electrode and/or capping layer, and non-filling defects, affecting display quality and reliability.
Innovation Solution
The display device incorporates a dam structure with a specific angle configuration and cover layers that prevent air bubbles from moving into the display area by blocking their movement during the curing process, while ensuring effective filling of the space between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is used to bond the first substrate and the second substrate, then the substrates are securely bonded, but air bubbles form in the peripheral area during filler curing, causing lifting defects and non-filling issues
Solution Approach 1:
The patent divides the peripheral area into multiple segments by introducing first and second dams that partition the space between substrates. This segmentation prevents air bubbles from coalescing and moving freely, confining them to specific regions away from the display area, thus resolving the contradiction between secure bonding and air bubble formation.
Solution Approach 2:
The patent introduces dams as intermediary structures between the sealant and the display area. These dams act as barriers that mediate the interaction between the filler material and the display area, allowing the sealant to bond substrates securely while preventing air bubbles from reaching critical regions, thereby resolving the harmful effect of air bubble formation.
2Object-affected harmful factors
If the dam structure is designed with specific angle configurations, then air bubble movement is blocked effectively, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by designing dams with specific angle configurations only in critical regions where air bubble blocking is most needed. The first dam has a first angle configuration facing the sealant and a second angle configuration facing the display area, while the second dam has similar angular variations. This localized angular design provides effective air bubble blocking without unnecessarily complicating the entire dam structure, thus resolving the contradiction between blocking effectiveness and manufacturing complexity.
3Object-affected harmful factors
If cover layers are added on the dams to protrude toward the sealant, then air bubbles are blocked more effectively, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extends the dam structure into a third dimension by adding cover layers that protrude from the dam surfaces toward the sealant. This dimensional extension creates an additional barrier against air bubble movement without significantly increasing planar complexity. The cover layers are strategically positioned to block air bubbles while maintaining a relatively simple overall structure, thus resolving the contradiction between blocking effectiveness and device complexity.
Data Source
AI summary
A display device includes a first substrate including a display area and a peripheral area, a circuit element layer and a light emitting element layer in the display area, a second substrate facing the light emitting element layer and defining a space therebetween, a sealant which in the peripheral area and bonding the first and second substrates to each other, a filler inside of the sealant and filling the space, and a dam which is in the peripheral area and between the light emitting element layer and the sealant. The dam includes a first side surface which faces the sealant and a second side surface which faces the light emitting element layer, and an angle between the first side surface and a lower surface of the dam which is greater than an angle between the second side surface and the lower surface of the dam.