Curved Glass Screen Protector Adhesion Without Air Gaps
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Solution Overview
Problem
Existing protective films for portable displays with both flat and curved areas face challenges in adhering uniformly due to variations in curvature, leading to potential air layers and deterioration of touch sensitivity and display characteristics.
Innovation Solution
A glass protective film with a flat area and curved extensions, using an adhesive composition with fluidity and photopolymerizable components, along with adhesion enhancing patterns and water-repellent/oil-repellent features, ensures stable adhesion across varying curvatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass protective film is molded to match the curved surface of a portable display, then the protective function is improved, but the adhesion stability deteriorates due to curvature variations between products
Solution Approach 1:
The glass protective film is divided into a flat area portion corresponding to the flat display area and a curved area portion corresponding to the curved display area. This local differentiation allows each portion to optimally match its corresponding display region, maintaining protective function while adapting to curvature variations across different products
Solution Approach 2:
The protective film is segmented into distinct flat and curved area portions with different geometric properties. This segmentation enables the film to accommodate curvature variations between products by having dedicated regions for different surface types, resolving the adhesion stability issue
2Adaptability or versatility
If a fluid adhesive composition is used to cover the entire lower surface, then adhesion to curved surfaces is improved, but adhesive leakage increases
Solution Approach 1:
A thin film adhesive layer is formed by spreading the fluid adhesive composition and curing it. This thin film structure provides flexibility to conform to curved surfaces while the film nature contains the adhesive, preventing leakage beyond the boundaries of the glass protective film
Solution Approach 2:
The adhesive composition undergoes a parameter change from fluid state to cured solid state. The fluid state allows spreading to cover the entire lower surface including curved areas, while the cured state provides structural integrity to prevent leakage
3Area of stationary object
If the adhesive composition is spread to the entire area, then coverage completeness is improved, but air layer formation worsens due to curvature mismatch
Solution Approach 1:
The glass protective film has locally differentiated geometry with a flat area portion and a curved area portion. This local quality matching ensures that when the adhesive spreads across the entire lower surface, it maintains intimate contact with the corresponding display areas, preventing air layer formation despite the curvature differences
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents air layers, maintains touch sensitivity, and enhances adhesion strength, ensuring uniform coverage and protection for both flat and curved display areas.
Implementation Method 1
an adhesive layer which is formed by spreading and curing the adhesive composition having fluidity between the entire area of the lower surface of the glass film member and the display area of the portable display
Data Source
AI summary
Disclosed is a glass protective film for covering a curved surface which protects display areas of a portable display including a flat display area and a curved display area. The glass protective film for covering the curved surface includes a glass film member having a flat area portion corresponding to the flat display area and a curved area portion corresponding to the curved display area and an adhesive layer adhering the entire area of the lower surface of the glass film member to the display area of the portable display.