A visual information processing device having a neural network function and capable of visual information processing comprises a semiconductor integrated circuit device section equipped with a plurality of neuronic circuit regions realizing a neuron function included in the neural network function, and first and second molecular film sections provided on the integrated circuit device section. The first molecular film section comprises a light-receiving molecular film section including Tij input elements having a photoelectric function and to which coupling strength levels (Tij) between the plurality of neuronic circuit regions are optically written to realize electric connection between the neuronic circuit regions and image input elements for sensing visual images, each neuronic circuit region corresponding to one pixel. The second molecular film section comprises a light-emitting molecular film section including Tij signal output elements having a light emitting function to output Tij matrix signals as matrix light emission patterns.
Visual information processing devices