Window with Localized Crystal Layer for Impact Resistance
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Solution Overview
Problem
Conventional windows used in display devices lack sufficient durability against external impacts, necessitating a method to enhance their strength and resistance.
Innovation Solution
A window design featuring a base glass with a crystal layer containing P2O5, ZrO2, or TiO2, where the crystal layer overlaps the exterior region, including corner regions, and has a different crystal content and thermal expansion coefficient than the base glass, combined with a manufacturing method involving ion implantation and thermal treatment to form a crystalline layer for improved strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ion implantation is used to form a crystal layer in the exterior region, then impact resistance and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by forming a crystal layer only in the exterior region of the glass substrate through ion implantation, while the central region maintains its original glass structure. This localized treatment enhances impact resistance where it is most needed (at the edges and corners more susceptible to damage) without unnecessarily complicating the entire manufacturing process or altering the properties of the central display area.
Solution Approach 2:
The manufacturing process is segmented into distinct stages: forming the base glass substrate, applying mask to protect the central region, performing ion implantation only on the exterior region, and conducting thermal treatment. This segmentation allows the complex ion implantation process to be applied only where needed, reducing overall manufacturing complexity while achieving the desired strength enhancement.
2Strength
If a crystal layer with different thermal expansion coefficient is added, then fracture toughness is improved, but thermal stability may be compromised
Solution Approach 1:
The crystal layer with different thermal expansion coefficient is applied only to the exterior region, not the entire glass substrate. This localized approach allows the crystal layer to provide enhanced fracture toughness at the edges and corners where it is most needed, while the central region maintains the original thermal properties of the glass, thus preserving overall thermal stability.
Solution Approach 2:
The patent creates a composite structure by combining the original glass substrate with a crystal layer containing P2O5, ZrO2, and TiO2. This composite material approach allows the crystal layer to provide enhanced mechanical strength and fracture toughness while the underlying glass substrate maintains thermal stability, achieving a balance between the two properties.
3Strength
If the crystal layer thickness is increased to improve strength, then impact resistance increases, but light transmittance decreases
Solution Approach 1:
The crystal layer is applied only to the exterior region of the glass substrate, not the entire surface. This localized application ensures that the thickness of the crystal layer (20-100 μm) provides sufficient impact resistance at the edges and corners without creating a uniformly thick layer across the entire glass, which would significantly reduce light transmittance for the display area.
Solution Approach 2:
The patent applies partial action by treating only the exterior region with ion implantation and forming a crystal layer only where needed for impact protection. This partial treatment provides adequate strength enhancement without the excessive thickness that would be required if the entire glass substrate were converted to crystal, thereby maintaining good light transmittance properties.
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 window exhibits enhanced durability and impact resistance, with improved thermal stability and fracture toughness, maintaining high light transmittance and surface strength.
Implementation Method 1
forming a preliminary crystal layer by implanting a nucleating agent into the base glass through ion implantation
Implementation Method 2
performing a thermal treatment on the preliminary crystal layer
Implementation Method 3
a coefficient of thermal expansion of the base glass may be different from a coefficient of thermal expansion of the crystal layer
Data Source
AI summary
A window includes a base glass including a central region, and an exterior region surrounding the central region, and a crystal layer disposed on the base glass and overlapping the exterior region, where the crystal layer includes at least one selected from P2O5, ZrO2, and TiO2, and a crystal content of the base glass is different from a crystal content of the crystal layer.