![]() ![]() This process is the opposite of scotopic adaptation, which is called photopic adaptation." In contrast, if you come out of a dark movie theater on a sunny day, you feel very dazzled at first and it takes a while to see the surrounding scenery. "This phenomenon is called scotopic adaptation. "For example, when you enter a darkened movie theater from a bright hall, you can hardly see anything initially, but after a while in the theater, it becomes easier to see," Chai explained. This ultimately allows the human eye to gradually adapt to different levels of illumination, to see well in both dark and bright environments, a capability known as " visual adaptation." When perceiving external light signals, the human retina adjusts the photosensitivity of its photoreceptors (i.e., rods and cones) according to the intensity of the signals. The intensity of natural light can vary significantly, with an overall range of 280 dB. "Our new study builds on all of our previous efforts." "In 2020, we examined the concept of near-sensor and in-sensor computing paradigms and provided our perspective in this field," Chai said. Specifically, this new device could sense the environment, store information in its memory, and perform neuromorphic visual pre-processing operations. One year later, the team presented a new optoelectronic resistive random-access memory device with three different capabilities. In 2018, Chai and his colleagues published their first paper on optoelectronic memories, where they introduced a resistive switching memory device, which could perform both photo-sensing and logic operations. "This emerging device can output light-dependent and history-dependent signals, which enables image integration, weak signal accumulation, spectrum analysis and other complicated image processing functions, integrating the multifunction of sensing, data storage and data processing in a single device." ![]() "Our research team started the research on optoelectronic memory five years ago," Yang Chai, one of the researchers who developed the sensor, told TechXplore. This bio-inspired sensor, presented in a paper published in Nature Electronics, was fabricated using phototransistors made of molybdenum disulfide. Researchers at Hong Kong Polytechnic University, Peking University, Yonsei University and Fudan University have recently created a new sensor that can collect data in various illumination conditions, employing a mechanism that artificially replicates the functioning of the retina in the human eye.
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