DOI: https://doi.org/10.15368/theses.2015.53
Available at: https://digitalcommons.calpoly.edu/theses/1387
Date of Award
6-2015
Degree Name
MS in Electrical Engineering
Department/Program
Electrical Engineering
Advisor
Tina Smilkstein
Abstract
This thesis designed and fabricated various devices that were interfaced to an IC for an active contact lens that notifies the user of an event by detection of an external wireless signal. The contact lens consisted of an embedded antenna providing communication with a 2.4GHz system, as well as inductive charging at an operating frequency of 13.56 MHz. The lens utilized a CBC005 5µAh thin film battery by Cymbet and a manufactured graphene super capacitor as a power source. The custom integrated circuit (IC) was designed using the On Semiconductor CMOS C5 0.6 µm process to manage the battery and drive the display. A transparent, flexible, single cell display was developed utilizing electrochromic ink to indicate to the user of an event. Assembly of the components, encapsulation, and molding were implemented to create the final product. The material properties of the chosen substrate were analyzed for their clearness, flexibility, and biocompatibility to determine its suitability as a contact lens material. Finally, the two different fabrication techniques (microfabrication and screen printing) that were employed to make the devices are compared to determine the favorable process for each part of the system.
Included in
Biomedical Commons, Biomedical Devices and Instrumentation Commons, Electrical and Electronics Commons, Electronic Devices and Semiconductor Manufacturing Commons, Other Biomedical Engineering and Bioengineering Commons, Systems and Communications Commons, VLSI and Circuits, Embedded and Hardware Systems Commons