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Area of Science:

Biomedical Engineering
Electrical Engineering
Materials Science

Background:

Active contact lenses offer potential for advanced ocular applications.
Wireless power transfer is crucial for miniaturized, implantable electronic devices.
Integration of power harvesting and management systems is a key challenge for such devices.

Purpose of the Study:

To develop a wirelessly-powered active contact lens prototype.
To demonstrate efficient radio frequency (RF) power harvesting and management for a micro-LED.
To validate wireless power transfer capabilities at a practical distance.

Main Methods:

Fabrication of a transparent polymer substrate with integrated loop antenna, power harvesting integrated circuit (IC), and micro-LED.
Utilizing a 0.13 μm CMOS process for the fully integrated power harvesting and management system (die area: 0.2 mm²).
Employing an on-chip capacitor for energy storage to power the micro-LED pixel.

Main Results:

Successful fabrication of a compact, integrated system on a 0.2 mm² die.
Demonstration of wireless power transfer to the contact lens system at a 10 cm distance.
Successful illumination of a micro-LED pixel using harvested energy.

Conclusions:

The developed system represents significant progress toward functional, wirelessly-powered active contact lenses.
The integrated CMOS IC efficiently manages harvested RF energy for micro-LED activation.
This technology paves the way for future smart contact lens applications requiring wireless power.