Self-powered Flexible Devices: Piezo-sensor and microLED
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초록
내용
The first part will introduce a machine learning-based acoustic sensor by mimicking the basilar membrane of cochlear. Highly sensitive self-powered flexible piezoelectric acoustic sensor (f-PAS) with multi-resonant frequency band was employed for voice recognition. The speech waveforms were recorded by the f-PAS to obtain the characteristics of voice frequency. CNN was utilized for speaker recognition, showing a 97.5% recognition with the 75% reduction of error compared to that of MEMS microphone. The second part will discuss the flexible vertical GaAs/GaN microLED on plastic substrates using micro-vacuum transfer and anisotropic conductive film. The superb properties of the flexible inorganic LED enable the dramatic extension of flexible displays toward wearable phototherapy patches like hair growth and melanogenesis inhibition. Combining with optogenetic mouse models, flexible microLED stimulates the neurons of motor cortex for manipulating body movements and synchronized EMG signals.