Encapsulated electronics

Abstract

An eye-mountable device includes an electrochemical sensor embedded in a polymeric material configured for mounting to a surface of an eye. The electrochemical sensor includes a working electrode and a reference electrode that reacts with an analyte to generate a sensor measurement related to a concentration of the analyte in a fluid to which the eye-mountable device is exposed. An example assembly process includes: forming a sacrificial layer on a working substrate; forming a first layer of a bio-compatible material on the sacrificial layer; providing an electronics module on the first layer of the bio-compatible material, forming a second layer of the bio-compatible material to cover the electronics module; and annealing the first and second layers of the bio-compatible material together to form an encapsulated structure having the electronics module fully encapsulated by the bio-compatible material.

1 - 20 . (canceled) 
     
     
         21 . An eye-mountable device comprising:
 a transparent polymeric material having a concave surface and a convex surface, wherein the concave surface is configured to be mounted over a corneal surface and the convex surface is configured to be compatible with eyelid motion when the concave surface is so mounted;   a liquid crystal material embedded within the transparent polymeric material;   a ring-shaped structure embedded in the polymeric material, wherein the ring-shaped structure comprises electronic components encapsulated within a bio-compatible material, wherein the bio-compatible material includes a first layer and a second layer in which the electronic components are interposed between the first and second layers, wherein the electronic components include an antenna, a light sensor, and a controller, wherein the controller is coupled to the antenna, the light sensor, and the liquid crystal material.   
     
     
         22 . The eye-mountable device of  claim 21 , wherein the controller is configured to engage in wireless communication via the antenna. 
     
     
         23 . The eye-mountable device of  claim 21 , wherein the controller is configured to harvest energy from radio frequency radiation received by the antenna. 
     
     
         24 . The eye-mountable device of  claim 21 , wherein the electronic components further include one or more light sources coupled to the controller. 
     
     
         25 . The eye-mountable device of  claim 21 , wherein the controller comprises an integrated circuit. 
     
     
         26 . The eye-mountable device of  claim 21 , wherein the antenna comprises a loop of conductive material. 
     
     
         27 . The eye-mountable device of  claim 21 , wherein portions of the first and second layers are annealed together. 
     
     
         28 . The eye-mountable device of  claim 21 , wherein the ring-shaped structure includes a conductor that is not encapsulated within the bio-compatible material. 
     
     
         29 . The eye-mountable device of  claim 21 , wherein the bio-compatible material comprises a dichlorodi-p-xylylene polymer.