Display Cover Glass With Depth-Varied Stress for Impact Protection
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Solution Overview
Problem
The cover member in display devices needs to be strengthened to protect against impacts from collisions, such as those occurring during accidents, while maintaining optical properties and image clarity.
Innovation Solution
A display device comprising a chemically strengthened glass plate with a compressive stress layer of varying depth and an optical layer with specific particle configurations to enhance impact resistance and anti-glare properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of the cover member is increased to protect against impact, then impact resistance is improved, but the glass plate becomes more prone to spontaneous breakdown
Solution Approach 1:
The patent applies different compressive stress layer depths to different surfaces of the glass plate. The first surface (facing the display panel) has a compressive stress layer depth of 5-20 μm, while the second surface (facing outward) has a depth of 10-30 μm. This local differentiation allows the glass to have optimized strength characteristics: sufficient impact resistance on the outer surface while maintaining reliability and reducing spontaneous breakdown risk on the inner surface through the shallower stress layer.
Solution Approach 2:
The patent changes the parameter of compressive stress layer depth to resolve the contradiction. By controlling the depth of the compressive stress layer formed through chemical strengthening to be 5-20 μm on the first surface and 10-30 μm on the second surface, the glass plate achieves both high impact resistance and reduced spontaneous breakdown. This parameter optimization allows the glass to withstand impact forces while maintaining structural reliability.
2Strength
If a chemically strengthened glass plate is used to enhance strength, then impact resistance is improved, but image clarity and optical properties may deteriorate
Solution Approach 1:
The patent applies local quality by creating different compressive stress layer depths on different surfaces of the glass plate. The first surface has a depth of 5-20 μm and the second surface has a depth of 10-30 μm. This localized differentiation allows the glass to achieve high impact resistance through the outer surface's deeper stress layer while the inner surface's shallower stress layer maintains better optical transmission and image clarity, thus resolving the contradiction between strength enhancement and optical property preservation.
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 provides effective protection against impacts and maintains image clarity by using a chemically strengthened glass plate with a depth-varying compressive stress layer and an optical layer with aligned particles, enhancing both strength and anti-glare properties.
Implementation Method 1
a glass plate that is chemically strengthened and has a first surface and a second surface in which a depth of a compressive stress layer (dol) is larger than that in the first surface
Data Source
AI summary
A display panel according to the present invention includes a display panel and a cover member disposed on the display panel. The cover member includes a glass plate that is chemically strengthened and has a first surface and a second surface in which the depth of the compressive stress layer (dol) is larger than that in the first surface, and an optical layer that is layered on the second surface and faces the outside.