Semi-Transparent Mirror Dielectric Stack for Dual Optical-Electronic Function
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Solution Overview
Problem
Mirrors with dielectric layers face challenges in maintaining desirable reflectance and transmittance properties, which can affect their ability to provide accurate reflections and aesthetic appeal, especially when used as both mirrors and electronic devices.
Innovation Solution
A semi-transparent mirror is developed with a specific coating stack comprising multiple dielectric layers, including ZnSnO, TiO2, and SiAlO, applied in precise thickness ranges to achieve optimal reflectance and transmittance properties, along with protective layers to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dielectric layers are applied to a mirror, then the mirror can be used simultaneously as an electronic device, but the reflectance and transmittance of light in the visible light wavelength are altered such that the mirror may not be able to carry out its intended purpose of providing accurate reflections
Solution Approach 1:
The patent applies dielectric layers with specific refractive indices and controlled thicknesses to the mirror substrate. By precisely controlling the optical parameters (refractive index, layer thickness) of the dielectric coatings, the reflectance and transmittance properties are tuned to maintain accurate reflections while enabling electronic device functionality. The layered dielectric structure modifies light interaction parameters to achieve both optical accuracy and electronic integration.
Solution Approach 2:
The patent creates a composite structure combining a reflective substrate with multiple dielectric layers having different refractive indices. This composite material system allows the mirror to simultaneously exhibit optical reflection properties and electronic device characteristics. The combination of different materials (substrate + dielectric layers) enables dual functionality while maintaining optical performance through careful material selection and layer design.
2Adaptability or versatility
If dielectric layers are applied to a mirror, then the mirror can serve dual purposes, but the aesthetic appearance may be compromised due to altered light transmission properties
Solution Approach 1:
The patent optimizes the optical parameters of dielectric layers, specifically controlling their thickness and refractive index values. By adjusting these parameters, the coating achieves desired reflectance and transmittance characteristics that maintain aesthetic appearance. The parameter optimization ensures that light interaction preserves visual quality while enabling electronic functionality.
Solution Approach 2:
The patent applies dielectric layers with spatially varying properties or selective positioning. Different regions or layers have optimized characteristics for specific functions - some layers prioritize reflectance for aesthetic appearance, while others enable electronic device operation. This localized optimization of layer properties allows simultaneous achievement of visual quality and functional versatility.
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 coated mirror achieves a light reflectance of at least 50% in the visible spectrum with specific color reflectance and transmittance values, ensuring both functional and aesthetic performance.
Implementation Method 1
A coated article comprises a substrate, a first dielectric layer over at least a portion of the substrate, a second dielectric layer over at least a portion of the first dielectric layer, a third dielectric layer over at least a portion of the second dielectric layer
Implementation Method 2
The coated article has a light reflectance of at least 50% in the visible light spectrum
Implementation Method 3
The first dielectric layer comprises ZnSnO or TiO2, the second dielectric layer comprises SiAlO, the third dielectric layer comprises ZnSnO or TiO2
Data Source
AI summary
A semi-transparent mirror and method of producing the same are disclosed. An exemplary embodiment includes a coated article comprising a substrate, a first dielectric layer over at least a portion of the substrate, a second dielectric layer over at least a portion of the first dielectric layer, a third dielectric layer over at least a portion of the second dielectric layer, a fourth dielectric layer over at least a portion of the third dielectric layer, and a protective layer over at least a portion of the fourth dielectric layer.