Tunable oscillating CMOS pixel for subretinal implants

Partial visual capabilities for some kind of blindness are still possible through direct electrical stimulation of retinal tissue. In this work, tunable implantable silicon CMOS pixel are presented and experimentally validated. Pulse width, stimulating output current and light sensibility may be regulated by external voltages, making this solution suitable for an auto-adapting artificial retina. Power consumption due to light detection and conversion is absolutely negligible compared to dissipation required for stimulating photoreceptors. The pixel pitch of around 70mum makes it among the smallest reported to-date