Curved Cover Window Geometry for Grip and Stress Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in providing a good grip sense to users and are prone to damage due to stress concentration on curved display panels, especially when the cover window is attached.
Innovation Solution
A cover window design with varying curvature radii and thicknesses in its side portions, matched by corresponding molds for manufacturing, to distribute stress evenly and reduce damage, while enhancing user grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover window has a uniform thickness and curvature radius, then the manufacturing process is simple, but stress concentrates on curved display panels causing damage
Solution Approach 1:
The cover window employs different curvature radii for its inner and outer surfaces. Specifically, the inner surface has a first curvature radius while the outer surface has a second curvature radius that is greater than the first. This local differentiation of geometric properties allows stress to be distributed more evenly across the curved display panel, preventing stress concentration and potential damage while maintaining an aesthetically pleasing appearance.
2Ease of operation
If the cover window has a flat surface only, then the manufacturing is easy, but the user grip sense is poor
Solution Approach 1:
The cover window features a curved surface configuration where the inner surface has a first curvature radius and the outer surface has a second curvature radius greater than the first. This local differentiation creates ergonomic contours that enhance user grip sense and comfort while the precise control of dual curvature radii meets manufacturing precision requirements.
3Reliability
If the cover window has varying thickness, then stress is distributed evenly, but the manufacturing complexity increases
Solution Approach 1:
The cover window is designed with an asymmetric thickness profile resulting from the different curvature radii of its inner and outer surfaces. The inner surface has a first curvature radius while the outer surface has a second curvature radius that is greater, creating a thickness variation that distributes stress evenly across the structure. This design reduces the risk of damage while the mold manufacturing process is adapted to accommodate this controlled asymmetry.
Data Source
AI summary
A cover window includes a front portion including a flat surface; a first side portion extending from a first edge of the front portion and being bent about a first axis that is parallel to the first edge of the front portion; a second side portion extending from a second edge crossing the first edge of the front portion and being bent about a second axis that is parallel to the second edge of the front portion; and a corner portion between the first side portion to the second side portion, wherein the first side portion includes an outer surface and an inner surface opposite to the outer surface, and a curvature radius of the outer surface is different from a curvature radius of the inner surface.