Adaptive Tuning of Contact Lens Resonant Circuit
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Solution Overview
Problem
The efficiency of power transfer in augmented reality systems using contact lens displays is compromised due to fluctuations in resonant frequency caused by changes in the wearer's environment, such as blinking or temperature variations, which affect the inductive coupling between the necklace-based energy source and the contact lens resonant circuit.
Innovation Solution
The contact lens display incorporates a tunable capacitive circuit that adjusts its resonant frequency to match the source frequency by periodically modifying its capacitance, using a feedback mechanism to maintain efficient energy transfer despite environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed resonant circuit is used in the contact lens display, then the circuit structure is simple, but the power transfer efficiency deteriorates due to resonant frequency fluctuations caused by environmental changes
Solution Approach 1:
The patent implements a tunable resonant circuit where the capacitance value can be dynamically adjusted based on environmental conditions. The circuit transitions from a fixed configuration to a dynamic one that adapts its resonant frequency to maintain optimal power transfer efficiency when environmental factors like temperature or wear conditions change.
Solution Approach 2:
The patent changes the electrical parameter (capacitance) of the resonant circuit to adapt to environmental variations. By adjusting the capacitance value, the resonant frequency of the circuit is tuned to match the source frequency, thereby maintaining efficient power transfer under different operating conditions.
2Reliability
If the capacitance is continuously adjusted to track resonant frequency changes, then the power transfer efficiency is maintained, but the energy consumption increases
Solution Approach 1:
Instead of continuous adjustment, the patent employs periodic tuning of the resonant circuit. The capacitance is adjusted at specific intervals or under specific conditions to maintain resonant frequency alignment, thereby reducing the energy consumption associated with constant monitoring and adjustment while still maintaining power transfer consistency.
Solution Approach 2:
The patent implements a feedback mechanism that monitors the power transfer efficiency or resonant frequency alignment and triggers capacitance adjustment only when necessary. This feedback-based approach ensures that the circuit maintains optimal performance while minimizing unnecessary energy expenditure on continuous adjustment.
3Adaptability or versatility
If a tunable capacitive circuit is added to the contact lens display, then the adaptability to environmental changes is improved, but the device complexity increases
Solution Approach 1:
The patent achieves environmental adaptability by implementing a tunable capacitive element that can change its electrical parameter (capacitance) in response to environmental conditions. This allows the resonant circuit to adapt its frequency characteristics to maintain optimal power transfer efficiency across varying operating conditions.
Solution Approach 2:
The patent enables the resonant circuit to self-adjust its capacitance based on environmental feedback, reducing the need for complex external control systems. The circuit automatically tunes itself to maintain resonant frequency alignment, thereby achieving adaptability while minimizing the addition of external control complexity.
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
This solution ensures consistent and efficient power transfer to the contact lens display, maintaining maximum voltage and efficiency even during changes in the wearer's environment, such as blinking or temperature fluctuations.
Implementation Method 1
a capacitive circuit (520) configured to change a capacitance of the capacitive circuit (520)
Implementation Method 2
resonant circuit (510) comprising an inductor (L0) and the capacitive circuit (520)
Implementation Method 3
energy is inductively coupled to the resonant circuit
Data Source
AI summary
An augmented reality system including a source and a contact lens display can be used to project information from the contact lens display onto the retina of the wearer's eye. The source provides energy to the contact lens display and operates at a source frequency. The source includes a source circuit including a conductive coil. The contact lens display includes a resonant circuit including another conductive coil and a capacitive circuit. The resonant circuit receives energy from the conductive coil of the source via a magnetic field inductively coupling the conductive coils. The contact lens display additionally includes a feedback circuit to adjust the capacitance of the capacitive circuit to control a resonant frequency of the resonant circuit. The feedback circuit can control the capacitive circuit to maintain the resonant frequency of the resonant circuit near the source frequency as the wearer's eye blinks.