Title :
Retinal prosthesis device based on pulse-frequency-modulation vision chip
Author :
Ohta, Jun ; Kagawa, Keiichiro ; Tokuda, Takashi ; Nunoshita, Masahiro
Author_Institution :
Graduate Sch. of Mater. Sci., Nara Inst. of Sci. & Technol., Japan
Abstract :
We describe a retinal prosthesis device that uses an image sensor based on a pulse frequency modulation (PFM) photosensor array. A PFM-based photosensor converts light intensity into the frequency of an output electrical pulse stream, and thus is suitable for stimulating retinal cells. We demonstrate various circuit improvements for image preprocessing and packaging techniques and present the results of an electrophysiology experiment.
Keywords :
CMOS image sensors; eye; image processing; prosthetics; pulse frequency modulation; sensory aids; visual evoked potentials; CMOS image sensor; electrophysiology experiment; image preprocessing; image sensor; light intensity; packaging techniques; photosensor array; pulse-frequency-modulation vision chip; retinal cell stimulation; retinal prosthesis; subretinal implant; Circuits; Frequency conversion; Frequency modulation; Image converters; Image sensors; Prosthetics; Pulse modulation; Retina; Sensor arrays; Streaming media;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465239
