Ceramic Stress-Control Cover Window for Hard-Coating Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cover windows for display devices are prone to deformation due to contraction and expansion of their components, compromising their hardness and protective capabilities.
Innovation Solution
A cover window structure comprising a window substrate, a stress control layer made of high-density ceramic, and a hard coating layer, designed to minimize deformation and enhance hardness by controlling stress from the hard coating layer's expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating layer is applied to increase hardness, then the protective capability is improved, but deformation occurs due to stress from expansion and contraction
Solution Approach 1:
A stress control layer is introduced as an intermediary between the window substrate and the hard coating layer. This intermediate layer absorbs and compensates for the stress generated during curing of the hard coating material, preventing deformation of the cover window while allowing the hard coating to provide its protective function.
Solution Approach 2:
The cover window is constructed as a composite structure with multiple layers: window substrate, stress control layer, and hard coating layer. Each layer is made of different materials with specific properties that complement each other, with the stress control layer specifically designed to manage thermal and mechanical stress between the substrate and hard coating.
2Strength
If the hard coating layer is made thicker to improve protection, then the hardness is enhanced, but the deformation and stress effects are amplified
Solution Approach 1:
The stress control layer acts as a buffer that can accommodate the increased stress from thicker hard coating layers, allowing the hard coating to be made thicker for enhanced protection without proportionally increasing deformation risk.
3Ease of manufacture
If conventional materials are used for the cover window, then the manufacturing is simpler, but the deformation susceptibility increases
Solution Approach 1:
The patent employs a composite structure with a specifically designed stress control layer that can be formed using conventional ceramic materials and manufacturing techniques. The multi-layer composite design adds minimal complexity to the manufacturing process while dramatically improving deformation resistance.
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 proposed structure significantly reduces deformation and enhances the hardness of the cover window, providing improved protection for display panels.
Implementation Method 1
contraction and expansion of members constituting the cover window
Implementation Method 2
a stress control layer on the window substrate and including a ceramic
Data Source
AI summary
A cover window, a display device, and a cover window manufacturing method are provided. The cover window includes a window substrate; a stress control layer on the window substrate and including a ceramic; and a hard coating layer on the stress control layer.