Variable-Thickness Cover Glass for Bending Uneven Display Assemblies
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Solution Overview
Problem
Glass substrates with varying thicknesses face challenges in bending and assembly to uneven structures, leading to potential defects due to difficulty in deforming the connection portion between thin and thick portions.
Innovation Solution
A glass substrate design with specific curvature radii and thicknesses for connection surfaces, allowing easy bending and assembly to uneven structures, including chemically strengthened glass for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If glass sheet portions having different sheet thicknesses are connected to each other to form a glass substrate, then the glass substrate can be assembled to an uneven structure, but the connection portion becomes difficult to bend
Solution Approach 1:
The patent applies local quality by creating a thickness gradient in the connection portion, where the sheet thickness transitions from the thin portion to the thick portion. This gradual thickness change (with curvature radius ≥400 μm) makes the connection portion more flexible and easier to bend while maintaining the overall uneven structure adaptability of the glass substrate.
2Strength
If the connection portion is difficult to bend, then structural integrity is maintained, but defects occur in the assembly when assembled to an uneven structure
Solution Approach 1:
The patent changes the geometric parameter of the connection portion by specifying a curvature radius of more than or equal to 400 μm for the first connection surface. This parameter change allows the connection portion to bend properly during assembly to uneven structures, preventing assembly defects while the overall glass substrate structure maintains its integrity.
3Ease of operation
If the sheet thickness of the connection portion is reduced to improve bendability, then the connection portion becomes easier to deform, but the strength of the connection portion decreases
Solution Approach 1:
The patent applies curvature by designing the first connection surface with a curvature radius of ≥400 μm. This curved surface geometry enables the connection portion to bend smoothly and easily while distributing stresses, thereby maintaining adequate strength despite the thickness reduction needed for flexibility.
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
Facilitates easy bending of the connection portion, reducing the risk of debonding and enhancing impact resistance, particularly suitable for in-vehicle display devices.
Implementation Method 1
the thin portion of the glass substrate is assembled to the uneven structure with the thin portion elastically deformed according to a shape of the uneven structure
Implementation Method 2
the glass substrate is a chemically strengthened glass
Data Source
AI summary
A glass substrate includes a thin portion having a first surface and a second surface opposed to the first surface, a thick portion having a first surface and a second surface opposed to the first surface and having a sheet thickness t3 that is larger than a sheet thickness t2 of the thin portion, a connection portion having a first connection surface and a second connection surface, the first connection surface connecting the first surface of the thin portion to the first surface of the thick portion, the second connection surface connecting the second surface of the thin portion to the second surface of the thick portion. The first connection surface has a curvature radius of more than or equal to 400 μm.