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[IEEE 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - Dallas, TX, USA (2019.8.4-2019.8.7)] 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - A CMOS 256-Pixel Self-Photovoltaics-Powered Subretinal Prosthetic Chip with Wide Image Dynamic Range and Shared Electrodes and Its In Vitro Experimental Results on Rd1 Mice
摘要： A self-photovoltaics-powered CMOS 256-pixel implantable chip with wide image dynamic range and shared electrodes is proposed and fabricated for subretinal prostheses. The infra-red (IR) light is incident only on photovoltaic cells of the chip whereas the visible light is mainly incident on pixels. The proposed adaptive background cancellation circuit (ABCC) is adopted to increase the image dynamic range so that the subretinal chip can adapt for different surrounding illuminances. Moreover, the bi-directional sharing electrodes (BDSEs) is used to increase electrode size under the same chip area and boost the stimulation charges to 11.4 nC. The functions of the chip have been successfully validated with both electrical measurement and in vitro patch clamp experiments with the retinas of Rd1 mice.
关键词： subretinal prostheses,CMOS image sensor,implantable chip
更新于2025-09-19 17:13:59
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[IEEE 2018 Conference on Emerging Devices and Smart Systems (ICEDSS) - Tiruchengode, India (2018.3.2-2018.3.3)] 2018 Conference on Emerging Devices and Smart Systems (ICEDSS) - Comparison Studies of Planar and Bulk Hetero Junction Nano Photo Diodes using Carbon Nano Tube's (CNT) and Graphene for Sub-retinal implant
摘要： Age related Macula Degeneration (AMD) and Retinitis Pigmentosa (RP) are the two major diseases that that influence the elderly individuals broadly around the world. This paper aims to develop a simple device that helps the recovery of the vision. Nano Photo Diode Arrays (NPDA) are photovoltaic cells using nano-materials like CNT’s and Graphene. They can generate stimulating electrical pulses under incident light which stimulate the photoreceptor cells in the retina thus enabling the restoration of vision. In this work, the authors have attempted to compare the Bilayer or Planar hetero junction (PHJ) and Bulk Hetero Junction (BHJ) photodiodes and optimize that would form the NPDA for subretinal implants. The simulations are carried out to compare and study the PHJ and BHJ based nano photodiodes by varying the thickness of anode layer, active layer, and cathode layer.
关键词： PHJ,Photo diode,Nano Photodiode Array (NPDA),subretinal prostheses,BHJ
更新于2025-09-09 09:28:46