Necklace TVMF Field Shaping for Contact Lens Power
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Solution Overview
Problem
Augmented reality systems face challenges in minimizing energy absorption by the human body while providing a high-quality viewing experience, particularly with untethered systems that require wireless power delivery to contact lens displays.
Innovation Solution
A necklace-based energy source that generates a time-varying magnetic field (TVMF) using a conductive coil and a shaping system with bucking loops to optimize energy transfer to the contact lens display, reducing energy absorption by the wearer while increasing power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power delivery is increased to provide sufficient power to the contact lens display, then power delivery capability is improved, but energy absorption by the human body increases
Solution Approach 1:
The magnetic field generation is segmented into multiple independent coils arranged in an array. Each coil can be individually controlled to generate magnetic fields that collectively shape the overall field distribution, allowing concentrated power delivery to the display while dispersing energy away from the body
Solution Approach 2:
The magnetic field intensity is made non-uniform through the coil array configuration, creating regions of high field strength at the contact lens display location and low field strength at the body interface. This local quality variation enables selective power delivery without proportional body exposure
Solution Approach 3:
The system performs preliminary field shaping by configuring the coil array geometry and current distribution before power delivery occurs. This pre-shaping of the magnetic field ensures that energy is directed toward the display while minimizing body absorption from the outset
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 decreases the specific absorption rate (SAR) in the human body, allowing for safer and more efficient energy transfer to the contact lens display, enhancing the usability of augmented reality systems as everyday accessories.
Implementation Method 1
A necklace-based energy source that generates a time-varying magnetic field (TVMF) using a conductive coil
Implementation Method 2
The contact lens display receives energy from the source to provide power to elements of the contact lens display (e.g., a femtoprojector)
Data Source
AI summary
An augmented reality system including a necklace and a contact lens display can be used to project information from the contact lens display onto the retina of the wearer's eye. In one example, the necklace generates a time-varying magnetic field (TVMF) that provides energy and information to the contact lens display via inductive coupling. The necklace can be configured to decrease the amount of energy absorbed by the body of the wearer and increase power transfer to the contact lens display. The necklace includes a conductive loop and one or more bucking loops that are positioned to increase transmitted energy while reducing the amount of energy absorbed by the human body. The amount of current travelling in one direction through the loops of the necklace is greater than the amount of current travelling in the opposite direction through the loops of the necklace. The necklace can include any number of signal generators and winding patterns for the loops.