Retina electrostimulation pixel circuit for artificial vision rehabilitation

Abstract

The invention discloses a retina electric stimulating picture element circuit for restoring artificial ocular, which comprises the following parts: one fotodiode, one CMOS inverter with Schmitt trigger function, one backfeed loop and one irritating electrode, wherein the extraneous visible illumination is carried in by fotodiode, which forms light current on the fotodiode; the anode of fotodiode connects to earth; the catelectrode of fotodiode connects to entry side of CMOS inverter with Schmitt trigger function; the backfeed loop links up between entry side of CMOS inverter and the catelectrode of fotodiode; the entry side of CMOS inverter connects to irritating electrode; the irritating electrode outputs retina electric stimulating signal; CMOS inverter with Schmitt trigger function is composed of three NMOS pipes and three PMOS pipes; the backfeed loop possesses one NMOS pipe and one PMOS pipe. The circuit simplifies the structure, which reduces the power consumption.

Description

technical field [0001] The invention belongs to artificial vision function restoration and photoelectric technology, in particular to a pixel circuit of a photodiode array used for retinal electrical stimulation to realize artificial vision restoration. Background technique [0002] Artificial visual function restoration technology is a kind of replacement of damaged photoreceptors in the retina by using externally implanted photosensitive devices, using the electrical signals generated by the photosensitive devices to stimulate or control other external electrical signals to stimulate retinal cells, so that the retinal cells caused by retinopathy Blind patients develop a "light perception". It involves the intersection of electronics, optics, biology, medicine and other disciplines. In recent years, many developed countries in the world are conducting research on artificial visual function restoration, especially some research institutions in the...

AI Technical Summary

Problems solved by technology

In the current solutions, there are problems of large pixel area (caused by adding a large capacitor next to the photodiode) and / or large power consumption (caused by the pixel structure), which are still difficult to meet practical applications, especially Requirements for applications under natural light conditions

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