Curved Display Adhesive Bonding for Corner Bubble Prevention
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Solution Overview
Problem
Existing display apparatuses face challenges in attaching a cover window to a display panel with curved portions, particularly in the corner areas, where bubbles or wrinkles can occur due to the varying curvature radius, leading to poor adhesion and potential visibility issues.
Innovation Solution
The use of different adhesive members, where a solid or semi-solid first adhesive member is applied to the main and subsidiary display areas, and a liquid second adhesive member is injected into the corner areas through an injection hole in the first adhesive member, allowing for flexible attachment and filling of the curved spaces without empty spaces, thereby ensuring proper adhesion and minimizing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single type of adhesive member is used to attach the cover window to the display panel, then the manufacturing process is simple, but bubbles or wrinkles occur in the corner areas with curved portions
Solution Approach 1:
The patent applies different types of adhesive members to different regions of the display panel. Specifically, a first adhesive member is used for the main display area with flat or gentle curvature, while a second adhesive member with different viscosity or composition is used for the corner display areas with higher curvature. This local differentiation ensures optimal adhesion in each region without causing bubbles or wrinkles in the corner areas.
2Reliability
If the adhesive member is applied to cover the entire display panel including corner areas, then the adhesion is comprehensive, but the curvature variation causes poor adhesion and visibility issues
Solution Approach 1:
The patent divides the display panel into different regions (main display area and corner display areas) and applies adhesive members with locally optimized properties. The first adhesive member covers the main display area, while the second adhesive member specifically targets the corner areas with higher curvature. This regional differentiation maintains comprehensive adhesion coverage while ensuring uniform adhesion quality across all areas by matching adhesive properties to local curvature requirements.
3Reliability
If a liquid adhesive member is used to fill curved spaces, then the adhesion in corner areas improves, but the manufacturing complexity increases due to injection requirements
Solution Approach 1:
The patent segments the adhesive application system into two parts: a first adhesive member applied to the main display area, and a second adhesive member injected into the corner display areas through injection holes. This segmentation allows the liquid second adhesive member to specifically fill the curved corner spaces and improve adhesion in those areas, while the first adhesive member provides base coverage. The injection holes are formed in the first adhesive member to enable controlled injection of the second adhesive member.
Solution Approach 2:
The first adhesive member serves as an intermediary structure that facilitates the injection of the second adhesive member into the corner areas. The injection holes are formed in the first adhesive member, allowing the liquid second adhesive member to be injected through these holes and reach the corner display areas. This intermediary approach enables the liquid adhesive to fill curved spaces effectively while maintaining a structured application process.
Data Source
AI summary
A display apparatus and a method of manufacturing a display apparatus are provided. The display apparatus includes: a display panel including at least one curved portion; a cover window covering one surface of the display panel; and a plurality of different adhesive members arranged between the display panel and the cover window. One of the plurality of different adhesive members is arranged to correspond to at least a portion of the curved portion of the display panel, and another of the plurality of different adhesive members is arranged to correspond to the rest of the display panel.