ANTI-ALIASING PHOTODETECTOR SYSTEM

摘要

An anti-aliasing photodetector system for a powered ophthalmic device, such as a contact lens, may be utilized for any number of functions. The anti-aliasing photodetector system converts current from an array of photodetectors into a voltage for use in other aspects of the powered ophthalmic device. The anti-aliasing photodetector system comprises a photodiode array including a plurality of individual photodiodes, an integrate-and-hold circuit, including a capacitor and switch to convert current to voltage, and an analog-to-digital converter. The anti-aliasing photodetector system provides for low power consumption, a wide dynamic range, noise rejection, and is capable of detecting incident ambient visible light as well as incident infrared light.

主权项

1. A powered ophthalmic device comprising:
a first sensor including one or more photodiodes producing a first output current; and a first integrator receiving the first output current and converting it to a first output voltage, wherein the first integrator comprises a first switch and a first capacitor, and is configured to integrate the first output current over a predetermined integration period of time.