JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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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)
  • Received : 2016.10.14
  • Accepted : 2017.01.31
  • Published : 2017.02.28
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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.

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References

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