Ambient Light Rejection Integrated Circuit for Autonomous Adaptation on a Sub-Retinal Prosthetic System
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kang, Hosung | - |
dc.contributor.author | Choi, Hojong | - |
dc.contributor.author | Kim, Jungsuk | - |
dc.date.accessioned | 2021-09-06T00:41:12Z | - |
dc.date.available | 2021-09-06T00:41:12Z | - |
dc.date.created | 2021-08-27 | - |
dc.date.issued | 2021-08 | - |
dc.identifier.issn | 1424-8220 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82066 | - |
dc.description.abstract | This paper introduces an ambient light rejection (ALR) circuit for the autonomous adaptation of a subretinal implant system. The sub-retinal implants, located beneath a bipolar cell layer, are known to have a significant advantage in spatial resolution by integrating more than a thousand pixels, compared to epi-retinal implants. However, challenges remain regarding current dispersion in high-density retinal implants, and ambient light induces pixel saturation. Thus, the technical issues of ambient light associated with a conventional image processing technique, which lead to high power consumption and area occupation, are still unresolved. Thus, it is necessary to develop a novel image-processing unit to handle ambient light, considering constraints related to power and area. In this paper, we present an ALR circuit as an image-processing unit for sub-retinal implants. We first introduced an ALR algorithm to reduce the ambient light in conventional retinal implants; next, we implemented the ALR algorithm as an application-specific integrated chip (ASIC). The ALR circuit was fabricated using a standard 0.35-μm CMOS process along with an image-sensor-based stimulator, a sensor pixel, and digital blocks. As experimental results, the ALR circuit occu-pies an area of 190 µm2, consumes a power of 3.2 mW and shows a maximum response time of 1.6 sec at a light intensity of 20,000 lux. The proposed ALR circuit also has a pixel loss rate of 0.3%. The experimental results show that the ALR circuit leads to a sensor pixel (SP) being autonomously adjusted, depending on the light intensity. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | MDPI | - |
dc.relation.isPartOf | Sensors | - |
dc.title | Ambient Light Rejection Integrated Circuit for Autonomous Adaptation on a Sub-Retinal Prosthetic System | - |
dc.type | Article | - |
dc.type.rims | ART | - |
dc.description.journalClass | 1 | - |
dc.identifier.wosid | 000690062800001 | - |
dc.identifier.doi | 10.3390/s21165638 | - |
dc.identifier.bibliographicCitation | Sensors, v.21, no.16 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.scopusid | 2-s2.0-85113223850 | - |
dc.citation.title | Sensors | - |
dc.citation.volume | 21 | - |
dc.citation.number | 16 | - |
dc.contributor.affiliatedAuthor | Choi, Hojong | - |
dc.contributor.affiliatedAuthor | Kim, Jungsuk | - |
dc.type.docType | Article | - |
dc.subject.keywordAuthor | Active pixel sensor | - |
dc.subject.keywordAuthor | Ambient light | - |
dc.subject.keywordAuthor | Image sensor | - |
dc.subject.keywordAuthor | Retina implant | - |
dc.subject.keywordPlus | Integrated circuits | - |
dc.subject.keywordPlus | Ophthalmology | - |
dc.subject.keywordPlus | Timing circuits | - |
dc.subject.keywordPlus | Ambient light rejections | - |
dc.subject.keywordPlus | Application specific | - |
dc.subject.keywordPlus | Current dispersions | - |
dc.subject.keywordPlus | High power consumption | - |
dc.subject.keywordPlus | Image processing technique | - |
dc.subject.keywordPlus | Maximum response time | - |
dc.subject.keywordPlus | Retinal prosthetics | - |
dc.subject.keywordPlus | Subretinal implants | - |
dc.subject.keywordPlus | Pixels | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Instruments & Instrumentation | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Analytical | - |
dc.relation.journalWebOfScienceCategory | Engineering, Electrical & Electronic | - |
dc.relation.journalWebOfScienceCategory | Instruments & Instrumentation | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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