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http://dx.doi.org/10.5573/JSTS.2017.17.1.035

A Multi-photodiode Array-based Retinal Implant IC with On/off Stimulation Strategy to Improve Spatial Resolution  

Park, Jeong Hoan (Department of Electrical and Computer Engineering, Seoul National University)
Shim, Shinyong (Department of Electrical and Computer Engineering, Seoul National University)
Jeong, Joonsoo (Department of Electrical and Computer Engineering, Seoul National University)
Kim, Sung June (Department of Electrical and Computer Engineering, Seoul National University)
Publication Information
JSTS:Journal of Semiconductor Technology and Science / v.17, no.1, 2017 , pp. 35-41 More about this Journal
Abstract
We propose a novel multi-photodiode array (MPDA) based retinal implant IC with on/off stimulation strategy for a visual prosthesis with improved spatial resolution. An active pixel sensor combined with a comparator enables generation of biphasic current pulses when light intensity meets a threshold condition. The threshold is tuned by changing the discharging time of the active pixel sensor for various light intensity environments. A prototype of the 30-channel retinal implant IC was fabricated with a unit pixel area of $0.021mm^2$, and the stimulus level up to $354{\mu}A$ was measured with the threshold ranging from 400 lx to 13120 lx.
Keywords
Photodiode; neural stimulator; retinal implant; on/off stimulation; spatial resolution;
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