Dam Pattern Resin Overflow Control in Display Window
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Solution Overview
Problem
Existing display apparatuses face challenges in preventing the overflow and fluctuation of transparent polymer resin used in adhesive layers, which can reduce image brightness and affect display performance due to insufficient hardening or excessive coating.
Innovation Solution
The use of a window member with a base film, blocking pattern, and dam pattern, along with an adhesive layer containing a transparent polymer resin, where the dam pattern surrounds the light transmission area and includes a first and second pattern with specific dimensions and shapes to prevent resin overflow, and a polarization member to reduce light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a transparent polymer resin is used in the adhesive layer, then the adhesive layer provides bonding between the display panel and window member, but the resin may overflow and fluctuate due to insufficient hardening or excessive coating, reducing image brightness and affecting display performance
Solution Approach 1:
The window member is segmented into distinct functional areas: a light transmission area for image display and a blocking area surrounding it. The dam pattern is further segmented into a first pattern on the blocking area and a second pattern on the light transmission area, creating discrete barriers that control resin flow in different zones independently
Solution Approach 2:
The dam pattern acts as an intermediary structure between the adhesive layer and the window member base film. This intermediate dam structure provides a physical barrier that mediates the resin flow, preventing direct contact between excess resin and the light transmission area, thus protecting image brightness while allowing adequate adhesive bonding
2Reliability
If the adhesive layer is coated excessively to ensure complete bonding, then bonding reliability improves, but resin overflow increases, reducing image brightness and affecting display performance
Solution Approach 1:
The dam pattern is formed on the window member before applying the adhesive layer. This preliminary structure pre-establishes containment barriers that guide and limit resin flow during the subsequent adhesive coating process, allowing excessive resin to be contained and redirected away from the light transmission area before it can harm image brightness
Solution Approach 2:
The dam pattern converts the potentially harmful effect of excessive resin coating into a beneficial outcome by providing a controlled pathway for the excess resin. The resin that would otherwise overflow and reduce brightness is instead directed to flow along the dam structure and blockings area, where it does not interfere with the light transmission area and image brightness
3Illumination intensity
If the adhesive layer is coated insufficiently to prevent resin overflow, then image brightness is maintained, but bonding reliability decreases, affecting display performance
Solution Approach 1:
The blocking area with blocking pattern serves as an intermediary zone between the adhesive layer and the light transmission area. This intermediate blocking structure allows the adhesive resin to be contained and controlled, ensuring adequate bonding in the blocking area while preventing resin from reaching the light transmission area, thus maintaining both bonding reliability and image brightness
Data Source
AI summary
A display apparatus includes a display panel that displays an image, a window member, and an adhesive layer. The window member includes a base film that has a light transmission area that exposes the image of the display panel, the light transmission area is surrounded by a blocking area, a blocking pattern on the blocking area, and a dam pattern on the blocking pattern. The adhesive layer is between the display panel and the window member.