Active Dimming Lens Structure for AR Antenna Decoupling
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Solution Overview
Problem
Augmented reality (AR) glasses with active dimming layers, which use transparent conductive oxides, suffer from antenna efficiency degradation due to coupling between the conductive layers and antennas, leading to reduced performance.
Innovation Solution
Increasing the distance between the conductive layers and antennas, enhancing the surface resistance of the conductive layers, and cutting microscopic slits in the active dimming material to reduce coupling and prevent power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active dimming layers with transparent conductive oxides are used in AR glasses lenses, then active dimming functionality is achieved, but antenna efficiency degrades due to coupling between conductive layers and antennas
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the antenna and the active dimming layer. This dielectric layer acts as a mediator that reduces the harmful coupling effect while allowing the active dimming layer to maintain its light modulation function. The dielectric material provides electrical isolation between the conductive antenna and the transparent conductive oxide layer, thereby improving antenna efficiency without sacrificing dimming capability.
Solution Approach 2:
The patent extracts or removes portions of the active dimming layer in specific regions where antennas are located. By taking out the conductive material from areas close to the antenna, the harmful coupling is eliminated or reduced. This selective removal allows the antenna to operate efficiently while preserving the active dimming functionality in other regions of the lens.
2Device complexity
If conductive layers are placed close to antennas for structural integration, then device complexity is reduced, but power dissipation increases due to coupling
Solution Approach 1:
The dielectric layer serves as a mediator that enables close structural integration of the active dimming layer with the antenna while preventing harmful electromagnetic coupling. This intermediary layer allows the conductive layers to be positioned near the antenna for simplified device structure, but blocks the energy transfer that would cause power dissipation, thus resolving the contradiction between integration and energy loss.
Solution Approach 2:
The patent changes the electrical parameters of the interface between the antenna and active dimming layer by introducing the dielectric layer. This parameter change (adding dielectric properties) modifies the electromagnetic field distribution and reduces the coupling coefficient, thereby decreasing power dissipation while maintaining the structural integration benefits.
3Reliability
If distance between conductive layers and antennas is increased to reduce coupling, then antenna efficiency improves, but device compactness deteriorates
Solution Approach 1:
The dielectric layer acts as a space-efficient mediator that provides electrical isolation without requiring large physical separation distances. By using the dielectric material's inherent insulating properties, the patent achieves effective decoupling while maintaining compact device dimensions, thus resolving the contradiction between antenna efficiency and device compactness.
Solution Approach 2:
The patent employs a thin dielectric film or layer to achieve the necessary electrical isolation between the antenna and active dimming layer. This thin film approach provides effective coupling reduction while occupying minimal space, thereby maintaining device compactness while improving antenna efficiency.
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
Improves antenna radiation efficiency by minimizing power absorption in the conductive layers, allowing for better performance without compromising the active dimming functionality.
Implementation Method 1
a dielectric layer is disposed between the antenna and the active dimming layer
Data Source
AI summary
The disclosed system may include a support structure, a lens mounted to the support structure, where the lens includes at least one conductive layer that includes conductive material, and an antenna disposed on the support structure within a specified maximum distance from the lens. Various characteristics of the lens or the antenna may be modified to reduce coupling between the antenna and the layer of conductive material in the lens. Various other wearable devices, apparatuses, and methods of manufacturing are also disclosed.