Light Transmissive Member Antireflection and Antistatic Layer Design
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Solution Overview
Problem
Light transmissive members with antireflection layers are prone to electrification, leading to adhesion of foreign substances and reduced visibility and appearance issues.
Innovation Solution
A light transmissive member with an antistatic layer comprising a transparent electrically conductive film layer and a refractive index layer stack, including silicon nitride and silicon oxide, is formed on one surface, while an antireflection layer with alternating high and low refractive index layers is formed on the other surface, enhancing visibility and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an antireflection layer is formed on the light transmissive member to enhance visibility, then visibility is improved, but the light transmissive member becomes easily electrified causing foreign substances to adhere to the surface
Solution Approach 1:
The invention divides the functional layers into two separate locations: an antireflection layer on one surface to improve visibility, and an antistatic layer on the opposite surface to prevent electrification. This segmentation allows each surface to independently perform its specific function without interfering with the other, resolving the contradiction between visibility enhancement and electrification prevention.
Solution Approach 2:
The invention applies different functional properties to different surfaces of the light transmissive member. One surface has antireflection properties (low refractive index) optimized for visibility, while the opposite surface has antistatic properties (electrically conductive) optimized for preventing electrification. This local differentiation of quality allows each surface to address its specific requirement without compromising the other.
2Strength
If silicon oxide is deposited on the outermost layer to provide high hardness and scratch resistance, then scratch resistance is improved, but the layer becomes more prone to electrification
Solution Approach 1:
The invention separates the scratch resistance function from the antistatic function by placing them on opposite surfaces. The silicon oxide layer providing hardness and scratch resistance is on one surface, while the electrically conductive antistatic layer is on the opposite surface, eliminating the electrification problem caused by the silicon oxide coating.
Solution Approach 2:
The invention introduces an electrically conductive layer as an intermediary on the outermost surface to counteract the electrification tendency of the silicon oxide layer. This conductive layer acts as a mediator that dissipates static electricity while allowing the silicon oxide layer beneath to maintain its scratch resistance properties.
3Illumination intensity
If multiple layers with different refractive indices are stacked to form the antireflection layer, then antireflection performance is improved, but the device complexity increases
Solution Approach 1:
The invention segments the optical functions from the electrical functions, placing the multilayer antireflection structure on one surface and the simpler single-layer or thin-film antistatic layer on the opposite surface. This segmentation allows the complex antireflection stacking to be confined to one area while keeping the overall device structure manageable and the other surface relatively simple.
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 effectively prevents electrification, reduces adhesion of foreign substances, and improves visibility and scratch resistance, while maintaining high antireflection and antifouling properties.
Implementation Method 1
forming the antistatic layer including the transparent electrically conductive film layer on the other surface of the substrate, electrification of the light transmissive member can be prevented
Implementation Method 2
an antireflection layer formed on one surface of the substrate... consisting of thin-film layers having a high refractive index alternating with thin-film layers having a low refractive index
Implementation Method 3
the visibility is enhanced by the antireflection layer formed on one surface of the substrate
Implementation Method 4
the layer composed of silicon nitride has an extremely high hardness and the layer composed of silicon oxide has a relatively high hardness, and therefore, the scratch resistance of the antireflection layer can be improved
Implementation Method 5
the deposition thereof is easily performed using general-purpose equipment
Data Source
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AI summary
A light transmissive member includes a substrate having a light transmission property, wherein on one surface of the substrate, an antireflection layer in which a low-refractive index layer composed mainly of silicon oxide (SiO2) and a high-refractive index layer composed mainly of silicon nitride (SiN) are alternately stacked is formed, and on the other surface of the substrate, an antistatic layer including at least a transparent electrically conductive film layer is formed.