An ultra-low power CMOS oscillating pixel array for retina implantation

Abstract

A light-controlled oscillating array for retina prosthesis is presented. The unique advantage of the circuit is that it has a lower voltage and ultra-low power consumption. And it has some other features as below: it is applicable to the natural light illumination and each pixel is an independent oscillator whose frequency is proportional to the intensity of the incident light. The fundamental characteristics of the circuit are analyzed. It is fabricated with a standard 0.6 μm CMOS technology. The experimental results indicate that the proposed circuit can be used for retina implantation, taking the place of the suffered photoreceptor in the retina of the blind and partially recovering the blind’s eyesight.

Keywords

Retina / Incident Light Intensity / Schmitt Trigger / Retinal Prosthesis / Prototype Chip

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This work has been supported by the National Natural Science Foundation of China (Nos. 30470469 and 60702007).