Reinforced Patterned Glass for Foldable Displays
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Solution Overview
Problem
Existing display devices with foldable or curved screens face challenges in maintaining visibility and structural integrity due to changes in volume and refractive index during the folding process.
Innovation Solution
A window made of reinforced patterned glass with a groove pattern, featuring a base layer and compressive stress layers on both surfaces, which maintains a compressive stress between 150 MPa and 350 MPa and has a compressive stress layer thickness between 1% and 5.5% of the non-patterned portion thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If patterned glass is used to facilitate folding operation, then flexibility and foldability are improved, but volume change and refractive index change occur causing visibility degradation
Solution Approach 1:
The patent applies different properties to different parts of the glass: the patterned portion has grooves for flexibility while the non-patterned portion maintains optical quality. The compressive stress layer is selectively applied with different thicknesses - thinner (1-5.5% of non-patterned thickness) on patterned areas to minimize volume/refractive index changes, and thicker on non-patterned areas for structural strength. This local differentiation resolves the contradiction between foldability and optical consistency.
Solution Approach 2:
The patent changes physical parameters of the glass structure: controlling compressive stress between 150-350 MPa, setting compressive stress layer thickness at 1-5.5% of non-patterned portion thickness, and maintaining groove depth at 1-10 μm. These parameter optimizations minimize volume change and refractive index change in the patterned portion while preserving foldability, thus resolving the visibility degradation issue.
2Strength
If compressive stress is increased to enhance structural durability, then strength is improved, but volume change and refractive index change increase causing visibility issues
Solution Approach 1:
The patent applies local quality by differentiating the compressive stress layer thickness between patterned and non-patterned portions. The patterned portion has a thinner compressive stress layer (1-5.5% of non-patterned thickness) to minimize volume change and refractive index change, while the non-patterned portion has a thicker layer for structural durability. This resolves the contradiction between strength and volume consistency.
Solution Approach 2:
The patent optimizes the compressive stress parameter to be between 150-350 MPa, which is sufficient for structural durability but controlled to minimize volume change. The compressive stress layer thickness is precisely controlled at 1-5.5% of the non-patterned portion thickness in the patterned area, balancing strength requirements with optical consistency.
3Ease of operation
If groove pattern depth is increased to improve folding flexibility, then ease of operation is improved, but volume change increases causing refractive index change and visibility degradation
Solution Approach 1:
The patent precisely controls the groove depth parameter within 1-10 μm. This optimized depth range provides sufficient folding flexibility while minimizing the volume displacement that causes refractive index changes. The controlled parameter ensures both ease of operation and optical consistency without excessive groove depth.
4Strength
If compressive stress layer thickness is increased to enhance strength, then durability is improved, but volume change and refractive index change increase degrading visibility
Solution Approach 1:
The patent applies local quality by setting the compressive stress layer thickness in the patterned portion at 1-5.5% of the non-patterned portion thickness. This thinner local thickness in the patterned area minimizes volume change and refractive index change for visibility, while the overall structure maintains durability through the stress layer in non-patterned areas and the controlled stress distribution.
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 solution enhances visibility and structural durability by minimizing volume and refractive index changes in the patterned portion, allowing for improved folding reliability and image clarity in display devices.
Implementation Method 1
a window including foldable, chemically strengthened patterned glass
Implementation Method 2
the reinforced patterned glass includes a base layer, and a compressive stress layer disposed on a top surface and a bottom surface of the base layer
Implementation Method 3
with little changes in a volume and in a refractive index of a patterned portion
Data Source
AI summary
A window includes a reinforced patterned glass including a patterned portion, in which a groove pattern is defined, and a non-patterned portion adjacent to the patterned portion, where the reinforced patterned glass includes a base layer, and a compressive stress layer disposed on a top surface and a bottom surface of the base layer. A compressive stress at a surface of the reinforced patterned glass measured by an ASTM C770-16 method is equal to or greater than about 150 MPa and equal to or less than about 350 MPa, and a thickness of the compressive stress layer is equal to or greater than about 1% of a thickness of the non-patterned portion and equal to or less than about 5.5% of the thickness of the non-patterned portion.