Glass Substrate Connecting Surface Pores for Edge Impact Resistance
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Solution Overview
Problem
The existing techniques for enhancing edge impact resistance of glass substrates for in-vehicle display devices, while maintaining appearance quality, fail to prevent cracking from oblique impacts and impair the linearity and color consistency of printing or functional layers due to surface smoothness issues.
Innovation Solution
A glass substrate design with a connecting surface featuring a plurality of pores, where the difference in 50% particle diameter between 20 μm distant from the main surface and the edge surface is 10 μm or less, along with specific curvature and angle ranges, to enhance edge impact resistance and maintain printing layer linearity and functional layer color consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connecting surface is configured with a plurality of concave portions to enhance edge impact resistance, then the edge impact resistance is improved, but the linearity of the printing layer is deteriorated and the appearance is impaired
Solution Approach 1:
The patent applies a porous structure to the connecting surface, where the surface includes pores with a total area ratio of 5% to 20% relative to the entire connecting surface. This porous configuration absorbs impact energy while maintaining a relatively smooth overall surface that preserves the linearity of printing layers and functional layers, thus resolving the contradiction between edge impact resistance and appearance quality.
Solution Approach 2:
The patent implements local quality by creating pores specifically at the connecting surface between the main surface and side surface, while keeping other surfaces smooth. The pore distribution is controlled to be localized to the connecting surface region, allowing enhanced impact resistance at the vulnerable edge area without affecting the linearity and appearance of printing layers on the main surface.
2Strength
If the connecting surface is configured with a plurality of concave portions to enhance edge impact resistance, then the edge impact resistance is improved, but the color tint uniformity of the functional layer is deteriorated
Solution Approach 1:
The controlled porous structure with 5% to 20% total area ratio provides impact absorption while maintaining sufficient surface continuity for uniform functional layer deposition. The pore size and distribution are optimized to prevent significant variations in optical path length, ensuring uniform color tint across the functional layer while still providing edge impact resistance.
Solution Approach 2:
The patent optimizes specific parameters of the porous structure, including pore size (0.1 μm to 10 μm), total area ratio (5% to 20%), and depth, to achieve a balance between impact resistance and optical uniformity. By controlling these parameters, the surface provides mechanical protection without creating significant optical interference that would cause color tint variations.
3Manufacturing precision
If the connecting surface is made smooth to maintain appearance quality, then the printing layer linearity is improved, but the edge impact resistance is reduced
Solution Approach 1:
The porous structure provides a compromise solution by creating a surface that appears relatively smooth to the human eye (maintaining printing layer linearity) while containing sufficient micro-structure to absorb impact energy (providing edge impact resistance). The pore size and distribution are controlled to be imperceptible visually but effective mechanically.
4Manufacturing precision
If the connecting surface is made smooth to maintain appearance quality, then the functional layer color uniformity is improved, but the edge impact resistance is reduced
Solution Approach 1:
The optimized porous structure provides sufficient surface continuity for uniform functional layer deposition (maintaining color uniformity) while containing micro-structural features that absorb impact energy (providing edge impact resistance). The total pore area ratio of 5% to 20% ensures adequate mechanical protection without creating significant optical interference.
Data Source
AI summary
A glass substrate includes a pair of main surfaces including a first main surface and a second main surface opposed to the first main surface; an edge surface arranged along a direction orthogonal to the pair of main surfaces; and a connecting surface arranged between the first main surface and the edge surface. The connecting surface has a plurality of pores. A difference between a 50% particle diameter of the pores in a portion 20 μm distant from the first main surface and a 50% particle diameter in a portion 20 μm distant from the edge surface is 10 μm or less.