Low-Reflectance Electro-Optic Electrode With Index-Matched Layers
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Solution Overview
Problem
Electro-optic elements experience undesirable reflections at optical transitions due to refractive index differences between materials, particularly at the interface of electrodes and electro-optic media, which are problematic for applications requiring high optical quality like eyewear.
Innovation Solution
Incorporation of intermediate layers with tailored refractive indices between the electrode and electro-optic medium to minimize reflections, using conductive materials like TiO2 and AZO to maintain electrical conductivity while reducing reflectance, and employing a quarter wave optical thickness for these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode is placed between the substrate and electro-optic medium, then electrical conductivity is achieved, but reflections increase due to refractive index differences
Solution Approach 1:
The patent introduces intermediate layers with graded refractive indices between the electrode and electro-optic medium. These intermediate layers act as mediators that gradually transition the refractive index, reducing the abrupt interface and minimizing reflections while preserving electrical conductivity through the use of conductive materials in the intermediate layers.
Solution Approach 2:
The patent changes the refractive index parameter gradually across multiple intermediate layers rather than having a single abrupt interface. By using layers with progressively changing refractive indices (from higher to lower), the system minimizes reflections at each interface while maintaining overall electrical conductivity through the stack.
2Object-generated harmful factors
If intermediate layers are added to reduce reflections, then optical quality improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by making specific regions of the electrode structure have different properties. The intermediate layers are localized at the interfaces where reflections occur most strongly, while other regions maintain their original structure. This targeted approach reduces reflections without unnecessarily complicating the entire device.
Solution Approach 2:
The patent uses composite structures combining multiple materials with different refractive indices and conductive properties. The intermediate layers are composed of conductive materials that provide both optical transition functionality and electrical conductivity, creating a composite structure that achieves multiple functions simultaneously rather than adding separate components.
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
Significantly reduces reflections at the electrode-electro-optic medium interface, maintaining optical quality and conductivity, suitable for applications such as eyewear.
Implementation Method 1
Functionally, the addition of the proper intermediate index material(s) serves to reduce reflectance through destructive interference caused by optical phase change in the intermediate layer(s)
Implementation Method 2
the addition of the proper intermediate index material(s) serves to reduce reflectance through destructive interference caused by optical phase change in the intermediate layer(s)
Data Source
AI summary
The present disclosure is directed to an electro-optic element having an electrode with a reduced reflectance construction. The electro-optic element may comprise a first substrate, a second substate disposed substantially parallel the first substate, a first electrode associated with the first substate, a second electrode associated with the second substate, and an electro-optic medium disposed between the first and second electrodes. Additionally, the electrode having the reduced reflectance construction may have a first transparent conductive oxide layer, and a high refractive index layer disposed such the first transparent conductive oxide layer is between the high refractive index layer and the electro-optic medium. The high refractive index layer comprising titanium di-oxide.