An Artificial Flexible Visual Memory System Based on an UV‐Motivated Memristor

Abstract

For the mimicry of human visual memory, a prominent challenge is how to detect and store the image information by electronic devices, which demands a multifunctional integration to sense light like eyes and to memorize image information like the brain by transforming optical signals to electrical signals that can be recognized by electronic devices. Although current image sensors can perceive simple images in real time, the image information fades away when the external image stimuli are removed. The deficiency between the state-of-the-art image sensors and visual memory system inspires the logical integration of image sensors and memory devices to realize the sensing and memory process toward light information for the bionic design of human visual memory. Hence, a facile architecture is designed to construct artificial flexible visual memory system by employing an UV-motivated memristor. The visual memory arrays can realize the detection and memory process of UV light distribution with a patterned image for a long-term retention and the stored image information can be reset by a negative voltage sweep and reprogrammed to the same or an other image distribution, which proves the effective reusability. These results provide new opportunities for the mimicry of human visual memory and enable the flexible visual memory device to be applied in future wearable electronics, electronic eyes, multifunctional robotics, and auxiliary equipment for visual handicapped.

An Artificial Optoelectronic Synapse Based on a Photoelectric Memcapacitor

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away quickly when the light stimuli are removed. [6][7][8][9] For example, a bioinspired visual system comprising an In 2 O 3 nanowire photodetector connected in series with an Al 2 O 3 memristor was fabricated recently, which could capture a butterflyshaped image and store it for more than 1 week. To realize both detection and memory functions so as to better imitate the human visual system, researchers have attempted to integrate the photodetectors with the nonvolatile memory devices.

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“…[3][4][5] In other words, traditional photodetectors can detect the images like a retina, but they lack the memory function owned by the visual cortex (see schematic illustration of human visual system in Figure 1a). [9] In such integrated devices, however, the units responsible for detection, processing, and storage of optical information are physically separated, resulting in high power consumption for data transfer between different units (just as the Von Neumann bottleneck [10,11] ).A simple yet effective humanoid optoelectronic device emerging recently is the artificial optoelectronic synapse based on the photoelectric memristor, which can co-locate the detection and memory functions in a single unit. [6][7][8][9] For example, a bioinspired visual system comprising an In 2 O 3 nanowire photodetector connected in series with an Al 2 O 3 memristor was fabricated recently, which could capture a butterflyshaped image and store it for more than 1 week.…”

Memristors with organic‐inorganic halide perovskites

“…Studies have shown that light can control Ca 2+ concentration ([Ca 2+ ] i ) in intracellular with a light‐gated Ca 2+ ion channels to control the influx of Ca 2+ , thereby modulating the synaptic plasticity behaviors . Previously, diverse memristors that can be controlled by a light stimulation have been suggested and investigated . As remarkable light absorbing materials, OHP‐based memristors offer the the potential of high‐order tuning of the synaptic plasticity.…”

Recent Advances in Smart Wearable Sensing Systems

“…[3,[29][30][31] Among these polymer substrates, PI has high tensile strength, very low creep, and great flexibility which can also be used at a temperature of 452 °C. Various polymer films, including polycarbonate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyimide (PI), have been developed as substrates for electronic devices and soft electrodes because of their great mechanical, good chemical resistance, and thermal stability.…”