Comparison of pixel circuits in pig eyeball experiment of artificial retina using thin-film devices

An artificial retina is a biological stimulation device that reproduces vision by electrically stimulating a living retina. We have developed an artificial retina using thin-film devices. We drove the artificial retina implanted in a pig eyeball by wireless power transfer and observed stimulation current flowed in the pig eyeball. In particular in this presentation, the stimulation current flowing in the pig eyeball was compared from the viewpoint of the pixel circuit. Excellent results were obtained when an nin-type thin-film photo-transistor (TFPT) was used, and an n-type thin-film transistor (TFT) was connected to the Vdd side.