Shen Guozhen's research team and Professor Chen Di from Institute of semiconductors, Chinese Academy of sciences have made new progress in the field of flexible artificial vision perception and storage system

Recently, the research team of researcher Shen Guozhen, National Key Laboratory of semiconductor superlattice, Institute of semiconductors, Chinese Academy of Sciences, has made new progress in the field of flexible artificial vision perception and storage system in cooperation with Professor Chen Di, School of mathematics and physics, Beijing University of science and technology The vision system of human body can not only be used to perceive the light information of the outside world, but also store the perceived information in the nervous system of the brain In recent years, researchers have made great progress in simulating human visual perception through the research of image sensor array However, although the current image sensor has realized the recognition ability for some simple graphics, when the external light disappears, the perceived graphics information will disappear immediately, and the storage function of the perceived information cannot be realized In order to make up for this defect and realize the bionic simulation of human visual system, it is an effective way to integrate image sensor and memristor reasonably Source: advanced materials (DOI: 10.1002 / ADMA 201705400) in order to realize the detection and memory function of integrated electronic devices for light information, a bionic flexible artificial vision perception and storage system was developed by cooperating with Dr Chen Shuai and assistant researcher Lou Zheng The system integrates an image sensor based on the micro line array of indium oxide semiconductor and an aluminum oxide resistor based on the atomic layer deposition The resistance state of image sensor will change from high resistance state to low resistance state by the excitation of ultraviolet light When the resistance is reduced to a certain value, the voltage at both ends of the series memristor will reach the opening voltage of the memristor, and then the excitation memristor will change from the high resistance state to the low resistance state, which corresponds to the off (1) and on (0) states in the logic circuit respectively In this way, when the ultraviolet light disappears, although the image sensor will return to its original state, the light information it perceives has been stored in the memory resistor in the form of binary In addition, the 10 × 10 vision memory array device assembled by expanding the pixel density of the device array can also realize the perception and storage function of the external image light distribution The artificial system shows a long-term information memory function, which can be stable for more than a week Moreover, by applying a negative voltage at both ends of the memristor, the stored light distribution information can be erased, and the light distribution information of other images can be stored again, so as to realize the reusability of the integrated device The flexible artificial vision system designed in this work has great application potential in wearable devices, electronic eyes, multi-functional robots and auxiliary devices for visually impaired people in the future, and provides new ideas for the design of new flexible multi-functional sensing and storage integrated devices such as tactile memory system and auditory memory system This work has been supported by the National Science Foundation for Distinguished Young Scholars, Beijing Natural Science Foundation and key research projects of Frontier Science of Chinese Academy of Sciences The research results were recently published in the Journal of advanced materials (DOI: 10.1002 / ADMA 201705400) Paper link: http://onlinelibrary.willey.com/doi/10.1002/adma.201705400/full personal profile of researcher Shen Guozhen: http://sourcedb.semi.cas.cn/zw/rczj/jcqn/201705/t20170512_.html personal profile of researcher Chen Di: http://shuli.ustb.edu.cn/? Info-9-114.html Professor Chen Di