Cover Window Curved Portion Segmentation for Adhesive Bonding
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Solution Overview
Problem
Conventional display devices with curved cover windows experience defects such as bubbles and peeling due to steep curved angles, which affect the bonding process and lead to quality issues.
Innovation Solution
A cover window design with a curved portion divided into multiple sections, each with varying radii of curvature and angles, optimized to minimize stress on the adhesive layer and prevent defects, featuring a flat portion and a curved portion with specific section configurations to reduce peel defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the curved angle of the curved portion becomes steep to achieve a more curved design, then the curvature effect is enhanced, but the radius of curvature decreases causing bubbles and peeling defects in the bonding process
Solution Approach 1:
The curved portion is divided into multiple sections (first, second, third, fourth sections) with progressively varying radii of curvature. This segmentation allows the overall curved shape to be achieved while each section maintains an optimized radius that prevents bonding defects.
Solution Approach 2:
Different sections of the curved portion have different radius of curvature values tailored to their specific positions and functional requirements. The first section has a larger radius to ensure reliable bonding, while subsequent sections have progressively smaller radii to achieve the desired curved aesthetic, with each section's radius optimized for its local conditions.
2Shape
If the radius of curvature is reduced to achieve a sharper curve, then the curved effect is enhanced, but stress concentration increases causing peeling defects
Solution Approach 1:
The curved portion is segmented into multiple sections with progressively varying radii. This prevents sudden stress concentration that would occur with a single sharp curve, as each section transitions smoothly to the next with controlled stress distribution.
Solution Approach 2:
The radius of curvature parameter is changed progressively across different sections rather than being uniform or abruptly changed. The first section has a larger radius to reduce stress, while subsequent sections have progressively smaller radii to achieve the curved effect, creating a smooth parameter transition that minimizes stress concentration.
3Ease of manufacture
If a single radius of curvature is used for the entire curved portion to simplify manufacturing, then the manufacturing process is simplified, but bonding defects occur due to stress concentration
Solution Approach 1:
The curved portion is divided into multiple sections with different radius values. While this increases manufacturing complexity compared to a single radius, each section can be manufactured using standard processes, and the segmentation itself is achieved through conventional molding techniques with multi-stage curvature formation.
Solution Approach 2:
Different sections have different radius values optimized for their specific positions. The first section uses a larger radius for reliable bonding, while subsequent sections use progressively smaller radii for the curved effect. This local optimization maintains bonding reliability while achieving the desired overall curved shape through manageable local variations.
Data Source
AI summary
A cover window including a flat portion and a curved portion extending from an end of the flat portion. The curved portion of the cover window includes a first section, a second section, and a third section, where the second section is disposed between the first section and the third section, an inner surface of the cover window contacts with an adhesive layer, a first radius of curvature having an average value of a radius of curvature of the inner surface of the cover window in the first section is greater than a second radius of curvature having an average value of a radius of curvature in the second section, and a third radius of curvature having an average value of a radius of curvature of the inner surface of the cover window in the third section is greater than the second radius of curvature.