Contact Lens Sensor Temperature Compensation Circuit
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Solution Overview
Problem
Contact lens sensors face accuracy degradation due to temperature dependence, leading to human-induced errors in body and ambient temperature measurements.
Innovation Solution
A contact lens system with a substrate and circuit that includes sensors and a compensation circuit to adjust sensor output based on temperature readings, using a temperature component to sense and compensate for temperature-induced inaccuracies, thereby maintaining accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation is implemented using additional sensors and circuits, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The temperature compensation function is merged with the existing sensor output processing circuit. The compensation circuit receives both the sensor output signal and temperature sensor signal, and processes them together to produce compensated output. This integration approach improves measurement precision through temperature compensation while minimizing additional circuit complexity by sharing existing circuit resources.
Solution Approach 2:
The compensation circuit is designed to handle multiple functions: it processes the primary sensor output, receives temperature compensation signals, and generates compensated output. This multi-functional design allows a single circuit to address both measurement and temperature compensation needs, reducing overall device complexity while maintaining high measurement precision.
2Measurement precision
If temperature compensation processing is performed continuously, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The compensation circuit processes temperature compensation periodically rather than continuously. It receives temperature sensor signals and sensor output signals, performs compensation processing at appropriate intervals, and updates the compensated output accordingly. This periodic operation maintains measurement precision while significantly reducing power consumption compared to continuous processing.
3Measurement precision
If multiple sensors are integrated on the contact lens substrate, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Different sensors are positioned at specific locations on the contact lens substrate where they are most effective. The temperature sensor and primary sensor are disposed at different locations, with each sensor optimized for its specific measurement function. This spatial differentiation improves measurement precision while managing integration complexity through purposeful placement rather than uniform distribution.
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 system ensures accurate contact lens sensor output while minimizing power consumption and complexity, effectively addressing temperature-related inaccuracies in body and ambient temperature sensing.
Implementation Method 1
a temperature component disposed on or within the substrate and coupled to the one or more sensors and that outputs information indicative of a temperature of the one or more sensors
Implementation Method 2
a compensation circuit disposed on or within the substrate and coupled to the one or more sensors and that outputs information to the one or more sensors to adjust an output of the one or more sensors
Data Source
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AI summary
Apparatus, systems and methods employing contact lens sensors are provided. In some aspects, a contact lens includes a substrate and a circuit. The circuit can include: one or more sensors disposed on or within the substrate, that sense a feature associated with a wearer of the contact lens; and a compensation circuit disposed on or within the substrate, coupled to the sensor(s) and that outputs information to adjust an output of the sensor(s). The compensation circuit can include: a temperature component that senses the temperature of the sensor(s); and a communication component that outputs information indicative of the temperature of the sensor(s), and receives information associated with adjusting the output of the sensor(s). In other aspects, a contact lens includes a circuit that senses the body temperature, or ambient temperature outside of the body, of the contact lens wearer. Sensor fusion and/or calibration can be performed based on the information.