College of Physics and Mathematics and Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, University of Science and Technology Beijing, Beijing, 100083, China.
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
Adv Mater. 2018 Feb;30(7). doi: 10.1002/adma.201705400. Epub 2018 Jan 8.
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.
为了模拟人类的视觉记忆，一个突出的挑战是如何通过电子设备检测和存储图像信息，这需要多功能的集成，以便像眼睛一样感知光线，并像大脑一样通过将光学信号转换为电子设备可以识别的电信号来记忆图像信息。虽然当前的图像传感器可以实时感知简单的图像，但当外部图像刺激消失时，图像信息也会消失。现有图像传感器和视觉记忆系统之间的差距，激发了图像传感器和存储设备的逻辑集成，以实现对光信息的传感和记忆过程，从而实现对人类视觉记忆的仿生设计。因此，通过采用紫外线激励的忆阻器，设计了一种简单的架构来构建人工柔性视觉记忆系统。视觉记忆阵列可以实现带有图案图像的紫外线分布的检测和存储过程，可以长时间保留，并且存储的图像信息可以通过负电压扫描重置，并重新编程为相同或其他图像分布，证明了其有效的可重复使用性。这些结果为人类视觉记忆的模拟提供了新的机会，并使柔性视觉记忆设备能够应用于未来的可穿戴电子设备、电子眼、多功能机器人以及视觉障碍辅助设备。
