科研之友
微信
新浪微博
Facebook
分享链接
摘要
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 0.021 mm(2), and the stimulus level up to 354 mu A was measured with the threshold ranging from 400 lx to 13120 lx.
- 出版日期2017-2-17
