Flexible Micro-Battery for Powering Smart Contact Lens

Abstract

In this paper, we demonstrate the first attempt of encapsulating a flexible micro battery into a contact lens to implement an eye-tracker. The paper discusses how to scale the battery to power various circuits embedded in the contact lens, such as ASIC, photodiodes, etc., as well as how to combine the battery with external harvested energy sources. The fabricated ring battery has a surface area of 0.75 cm2 yielding an areal capacity of 43 µAh·cm−2 at 20C. Based on simulated 0.35-µm CMOS ASIC power consumption, this value is large enough to allow powering the ASIC for 3 minutes. The functioning of the micro battery is demonstrated by powering an orange LED.

Electronic Contact Lens: A Platform for Wireless Health Monitoring Applications

“…To ensure uninterrupted operation, energy supply to the electronic contact lens needs careful consideration. For example, Nasreldin et al have investigated the use of flexible batteries that are integrated on the lenses . However, battery lifetime and replacement become an issue.…”

“…Moreover, antenna design in electronic contact lenses is very important. Previous designs that relied on a serpentine structure for power transfer and communications might impede eyesight, since the eyeball's physical structure is not carefully considered. Therefore, our design was based on a spiral coil antenna, which was fabricated on a polyimide flexible substrate and encapsulated with polydimethylsiloxane (PDMS) .…”

Direct Pre-lithiation of Electropolymerized Carbon Nanotubes for Enhanced Cycling Performance of Flexible Li-Ion Micro-Batteries

“…Zhang et al demonstrated that electrodeposition can be used to prepare NiCo 2 O 4 /graphene [13], while Chen et al prepared graphene hybrid nanosheet arrays via a one-pot procedure [14]; these synthesized graphene electrodes delivered good electrochemical performances. More recently, rapid research progress has been made in exploring flexible anode materials delivering high storage capacity and remarkable long-term cyclability [15][16][17]. As an allotrope of carbon, CNT electrodes offer several outstanding properties, such as excellent flexibility, fast charge transport, large surface-to-volume ratio, good chemical stability, high electrical conductivity and high reversible capacity [18][19][20][21][22][23][24][25][26].…”

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

“…The flexibility of the substrates is one of the major breakthroughs in the design of new generation sensor systems and other electronic devices [11][12][13][14][15]. Due to this reason, in our following studies, we obtained gas sensors using flexible Kapton HN®polyimide films (from DuPont™).…”