Screen Protector Edge Undercut for Strength and Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing screen protectors for electronic devices lack mechanical strength at the edges, which are prone to damage from contact with rough surfaces, corners, and small objects, leading to premature failure and the need for replacement, while also compromising on transparency and mechanical properties.
Innovation Solution
A screen protector design featuring a glass-based substrate with a thickness between 100 micrometers to 1,000 micrometers and an adhesive, where the edge comprises an undercut surface and a peripheral portion that extends outward, providing enhanced mechanical properties such as edge strength and crush resistance, maintaining transparency and desired mechanical properties across the entire surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent material is used to protect electronic devices, then transparency is maintained, but mechanical properties at the edge deteriorate
Solution Approach 1:
The patent applies local quality by creating a peripheral portion with different geometric properties than the bulk material. The edge features an undercut geometry where the material thickness varies, creating a localized structural reinforcement at the vulnerable edge region while maintaining the transparency of the overall material.
Solution Approach 2:
The patent introduces a geometric dimensionality change at the edge by creating an undercut surface that extends in multiple directions. This three-dimensional edge geometry provides mechanical reinforcement through increased material distribution and stress dispersion, rather than relying solely on material composition.
2Strength
If transparent material with desirable mechanical properties is used, then edge strength improves, but transparency is compromised
Solution Approach 1:
The reinforcement is localized to the edge region through the peripheral portion with undercut geometry, while the central bulk material maintains its original transparent properties. This allows the edge to have enhanced mechanical properties without compromising the overall transparency of the screen protector.
3Strength
If material thickness is increased to improve edge strength, then mechanical properties improve, but device compatibility and optical properties deteriorate
Solution Approach 1:
Instead of uniformly increasing thickness, the patent locally modifies the edge geometry with an undercut peripheral portion. This provides edge reinforcement while keeping the overall thickness within acceptable ranges for device compatibility and optical performance.
Solution Approach 2:
The patent compensates for reduced thickness by introducing geometric complexity at the edge through the undercut structure. This dimensional approach allows thinner overall construction while maintaining edge strength through optimized material distribution.
Data Source
AI summary
A screen protector comprises a glass-based substrate and an adhesive. The glass-based substrate comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface comprises a first planar portion and a peripheral portion extending outwardly from the first planar portion. The second major surface comprises a second planar portion opposite the first planar portion and is parallel to the first planar portion. The edge comprises an outer peripheral surface that intersects the peripheral portion of the first major surface. The adhesive comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface of the adhesive is adhered to the second major surface of the glass-based substrate.