Abstract
We demonstrated a multi-point stimulation system using CMOS chips designed for distributed implantable retinal prostheses. The CMOS chip integrates current sources and electrode selection circuits. This integration enables stimulation current control from multiple electrodes with minimal wires. In this study, we constructed a validation system with 49 electrodes capable of visually observing stimulation current outputs. The validation results show that it is possible to configure stimulation conditions in approximately 9.3 μs per electrode, and we demonstrated the ability to complete one frame, including the stimulation time, within approximately 11 ms. We also demonstrated parallel current stimulation from multiple electrodes using an in vitro experiment.
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