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We have evaluated wireless power transmission to thin-film devices. First, we measured the frequency characteristics of the receiving coil fabricated using thin-film electrodes in the actual experiment to find the resonance frequency. Next, we evaluated the frequency characteristics of the transmitting coil in the simulation and actual experiment to match the resonance frequency. Finally, we achieved...
We are developing artificial retinas using poly-Si thin-film transistors (TFTs), which is suitable for the epiretinal implant on the curved human eyeballs. In this study, we have evaluated the wireless power supply to the artificial retinas using poly-Si TFTs. From simulation, it is found that the transmission efficiency can be 0.43 % currently. This value should be improved but acceptable because...
We are developing artificial retinas using poly-Si thin-film transistors (TFTs), which is suitable for the epiretinal implant on the curved human eyeballs. In this study, we confirmed stimulus performance of poly-Si TFTs in in-vitro experiment for artificial retinas. It is found that correct output waveforms are observed using a CMOS inverter and ring oscillator. This means the stimulus performance...
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 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.
A promising photodevice, called p/i/n thin-film phototransistor, has been characterized from the viewpoint of operation condition and device behavior. It is found that the detected current becomes maximal when the control voltage is equal to the applied voltage. This is because a depletion layer is widely formed, and generated carriers are transported through an electron channel with high conductance...
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