Crystalline-Amorphous Glass Window for Curved Display Transparency
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Solution Overview
Problem
Existing windows for electronic devices, such as mobile phones and smart watches, face challenges in achieving high light transparency, small thickness, and high strength while maintaining a curved shape for improved operability and aesthetics.
Innovation Solution
A three-dimensional window design featuring a flat portion made of crystalline glass and a curved portion made of amorphous glass, joined through plasma fusion bonding, where the flat portion has high light transmittance and the curved portion offers improved processability and ductility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If glass is manufactured in a curved shape to improve operability and aesthetics, then the window achieves better visibility and design flexibility, but light transmittance decreases and manufacturing complexity increases
Solution Approach 1:
The window is divided into multiple regions with different curvature radii: a first region with a first curvature radius and a second region with a second curvature radius. This segmentation allows different parts of the window to have different optical and mechanical properties, enabling the curved shape to maintain aesthetics and operability while minimizing the impact on light transmittance by having flatter regions for display areas.
Solution Approach 2:
Different regions of the window are assigned different local properties through varying curvature radii. The first region has optimized curvature for structural strength and operability, while the second region has different curvature characteristics that balance aesthetics and light transmission. This local differentiation resolves the contradiction by ensuring that curvature is applied where needed without uniformly compromising light transmittance across the entire window.
2Length of moving object
If glass thickness is reduced to achieve small thickness and ease of movement, then the window becomes more portable and aesthetically pleasing, but strength and impact resistance decrease
Solution Approach 1:
The window is segmented into multiple regions with different curvature radii, where the first region has optimized curvature for structural reinforcement. This segmentation allows thin glass to maintain strength by concentrating structural support in specific curved regions while keeping other areas thin for portability and aesthetics.
Solution Approach 2:
The window utilizes controlled curvature with different radius values in different regions. The curved surfaces provide structural reinforcement through geometric strengthening, allowing thin glass to achieve both reduced thickness and improved strength. The specific curvature profiles are designed to distribute stress effectively while maintaining a sleek, thin appearance.
3Shape
If glass is made thinner and curved to improve aesthetics and operability, then the window achieves better design flexibility, but manufacturing precision and processability worsen
Solution Approach 1:
The manufacturing process is segmented into multiple steps: forming a first curved surface with a first curvature radius, then forming a second curved surface with a second curvature radius. This segmentation of the manufacturing process into discrete, controlled steps improves precision by allowing each curvature to be optimized and controlled independently, rather than attempting to create a complex single-curvature shape in one step.
Solution Approach 2:
The invention employs controlled spherical or curved surface formation with specific radius parameters. By defining precise curvature radii for different regions, the manufacturing process achieves high aesthetic quality while maintaining processability through standardized curved surface formation techniques that can be replicated with precision.
4Ease of manufacture
If a single glass material is used throughout the window to simplify manufacturing, then production processability improves, but the ability to optimize both light transmittance and structural strength in different regions is lost
Solution Approach 1:
The window structure is segmented into multiple regions with different curvature characteristics, allowing optimization of light transmittance and structural properties in each region. The first region and second region have different curvature radii that are tailored to their specific functional requirements, enabling differentiated optimization without changing material composition.
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 design provides enhanced light transmittance, impact resistance, and flexibility, allowing for multi-surface display and improved manufacturing processability.
Implementation Method 1
joining the flat portion and the curved portion to form a joining area along the joining line through a plasma fusion bonding process
Data Source
AI summary
A window for a display device includes a flat portion including a crystalline glass, and a curved portion including glass having a crystallinity degree lower than a crystallinity degree of the flat portion and coupled to the flat portion, where the curved portion is curved with respect to the flat portion, and a front surface of the curved portion includes a curved surface, and a front surface of the flat portion includes only a flat surface.