Curved Cover Window Geometry for Display Stress Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in providing a user with an excellent grip sense and reducing stress on curved display panels, which can lead to damage.
Innovation Solution
A cover window design with varying curvature radii and thicknesses in its side portions, matched by corresponding molds for manufacturing, to accommodate the display panel's curvature and reduce stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the cover window has a curved surface to match the display panel, then the aesthetic appeal and grip sense are improved, but stress concentration occurs leading to damage risk
Solution Approach 1:
The cover window employs different curvature radii at different locations: a first curvature radius at the side portion and a second curvature radius at the corner portion. This local differentiation allows the cover window to match the curved display panel surface for aesthetic appeal while strategically managing stress distribution to prevent concentration at vulnerable corner areas.
2Strength
If the cover window thickness is increased to reduce stress, then the structural integrity is improved, but the device becomes bulkier and less aesthetically appealing
Solution Approach 1:
The cover window has a thickness that varies locally: the side portion has a first thickness while the corner portion has a second thickness that is greater than or equal to the first thickness. This local thickening at corner portions provides enhanced structural integrity and stress resistance where needed most, while maintaining an overall thin and aesthetically pleasing profile.
3Ease of manufacture
If the cover window has uniform curvature radius, then the manufacturing process is simplified, but stress distribution becomes uneven causing damage
Solution Approach 1:
The cover window specifies different curvature radii for different portions: a first curvature radius for the side portion and a second curvature radius for the corner portion. This local differentiation optimizes stress distribution across the cover window surface, preventing stress concentration at corners while remaining achievable through conventional manufacturing processes like molding.
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.