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We have evaluated characteristic deviation and characteristic degradation of poly-Si thin-film phototransistors. We found that the characteristic deviation is not negligible, which seems due to energy distribution of excimer-laser crystallization, and must be compensated for some applications. We found that the characteristic degradation is negligible, which is convenient for abovementioned applications.

We have evaluated photoconductivities in diode connections using n-ch, p-ch, and pin-ch poly-Si TFTs for photosensor application. It is found that the photoconductivities increase as the illuminance increases for all the TFTs, but they do not change so much as the applied voltage changes. Moreover, the photoconductivities are: p-ch TFT

We have evaluated an artificial retina using thin-film devices driven by wireless power supply. It is found that the illumination profile can be correctly detected as the output voltage profile even if it is driven using unstable wireless power supply. Particularly in this presentation, we confirm correct working of pattern recognition.

Retinal prostheses have been ardently desired to recover the sight sense for sight-handicapped people. In our study, we have proposed an retinal prosthesis using poly-Si thin-film transistors. Particularly in this presentation, we will report a retinal prosthesis of frequency modulation, which is preferable to interconnect neuron cells because the neuron cells transfer the signal by frequency modulation.

Artificial retinas have been ardently desired to recover the sight sense for sight-handicapped people. We have verified that an artificial retina using poly-Si TFTs can be driven by wireless power supply. It is confirmed that the irradiated light distribution can be reproduced as the output voltage distribution owing to the parameter optimization of the wireless power supply system.