Scratch-Resistant Cover Glass Coating for 3D Curved Displays
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Solution Overview
Problem
Scratches on the glass cover plate of electronic devices due to contact with hard objects reduce mechanical strength and impact resistance, affecting the device's appearance and aesthetics.
Innovation Solution
A housing structure with a scratch-resistant layer composed of mixed high and low refractive index materials, integrated with an underlayer to enhance adhesion and an optical adjustment layer to maintain optical performance, is applied to the glass cover plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glass cover plate is used to protect the display panel, then mechanical strength and wear resistance are improved, but scratches appear on the surface over time which affects appearance and reduces impact resistance
Solution Approach 1:
The patent applies a composite scratch-resistant layer composed of multiple materials including silicon oxide, silicon nitride, and aluminum oxide in specific thickness ranges (50-200nm, 200-500nm, and 500-1000nm respectively). This multi-material composite structure provides enhanced scratch resistance while maintaining optical properties, directly addressing the problem of surface scratches on glass cover plates.
Solution Approach 2:
The patent optimizes specific parameter ranges for each layer thickness and material composition to achieve the desired balance between scratch resistance and optical performance. By controlling the thickness parameters and material ratios, the solution prevents scratches while maintaining the aesthetic appearance and light transmission properties of the glass cover plate.
2Object-affected harmful factors
If a protective structure is added to improve scratch resistance, then scratch resistance is improved, but light transmittance and light reflectance are affected causing appearance color changes
Solution Approach 1:
The patent carefully controls the thickness parameters of each layer within specific ranges (silicon oxide: 50-200nm, silicon nitride: 200-500nm, aluminum oxide: 500-1000nm) to optimize the balance between scratch resistance and optical performance. These parameter optimizations ensure that the protective structure maintains high light transmittance while providing effective scratch protection.
Solution Approach 2:
The multi-material composite structure with specific thickness control for each layer allows the patent to achieve both high scratch resistance and maintained light transmittance. The combination of different materials with varying optical properties enables the protective layer to be transparent while providing the necessary mechanical protection.
3Object-affected harmful factors
If the scratch-resistant layer has high refractive index material for scratch resistance, then scratch resistance is improved, but refractive index mismatch causes appearance color difference and optical performance degradation
Solution Approach 1:
The patent uses a composite structure with silicon nitride (high refractive index) and silicon oxide (low refractive index) in specific thickness ratios. This composite approach balances the high scratch resistance provided by the high refractive index material with the optical performance maintained by the low refractive index material, eliminating appearance color differences.
Solution Approach 2:
By controlling the thickness parameters of each material layer within specific ranges, the patent optimizes the optical interference effects to minimize appearance color changes while maintaining high scratch resistance. The parameter optimization ensures that the refractive index differences do not cause visible optical performance degradation.
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 high scratch resistance and maintains the appearance and optical performance of the glass cover plate, preventing color inconsistencies and film layer detachment.
Implementation Method 1
The at least one high refractive index material and the at least one low refractive index material are mixed to form the scratch-resistant layer, so that a refractive index of the scratch-resistant layer is the same as or close to that of the substrate
Implementation Method 2
since the scratch-resistant layer includes the high refractive index material, and the high refractive index material is dense and has a thickness ranging from 300 nm to 5000 nm, the scratch-resistant layer has high scratch resistance
Implementation Method 3
a first underlayer located between the substrate and the scratch-resistant layer, and configured to improve adhesion between the substrate and the scratch-resistant layer
Data Source
AI summary
This disclosure provides a housing structure, a display module, and an electronic device. The housing structure can improve scratch resistance of cover plate glass. When the housing structure is applied to a 3D curved display panel, there is no appearance color difference in a 3D cambered display area. The housing structure includes a substrate and a scratch-resistant layer located on a side of the substrate. The scratch-resistant layer includes at least two materials, and the at least two materials include at least one high refractive index material and at least one low refractive index material. The scratch-resistant layer has a thickness greater than or equal to 300 nm and less than or equal to 5000 nm. The low refractive index material has a refractive index less than or equal to a refractive index of the substrate, and the high refractive index material has a refractive index greater than 1.6.