Choi Han Byul, Oh Jinwon, Kim Youngsoo, Pyatykh Mikhail, Chang Yang Jun, Ryu Seunghwa, Park Steve
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2020 Apr 8;12(14):16691-16699. doi: 10.1021/acsami.0c00267. Epub 2020 Mar 25.
The demand for display technology is expected to increase with the continuous spread of portable electronics and with the expected emergence of flexible, wearable, and transparent display devices. A touch screen is a critical component in display technology that enables user interface operations, and the future generation of touch screens, the so-called 3D touch screens, is expected to be able to detect multiple levels of pressure. To enable 3D touch screens, transparent pressure sensors with high linearity over a working range that encompasses the pressure range of human touch (10-100 kPa) are required. In this work, a transparent and linear capacitive pressure sensor is reported with a transmittance over 85% and high linearity ( = 0.995) over 5-100 kPa of pressure. To render the sensor transparent, a microstructured "hard" elastomer layer was filled in with a refractive index matching a "soft" elastomer layer, through which light scattering was minimized. High linearity was attained from the sensor's unique architecture that increases the effective area of the capacitor with applied pressure. These attributes render our sensor highly suitable for future 3D touch screen applications.
随着便携式电子产品的不断普及以及柔性、可穿戴和透明显示设备的预期出现，对显示技术的需求预计将会增加。触摸屏是显示技术中的关键组件，它能够实现用户界面操作，而新一代触摸屏，即所谓的3D触摸屏，预计将能够检测多个压力级别。为了实现3D触摸屏，需要在涵盖人类触摸压力范围（10 - 100 kPa）的工作范围内具有高线性度的透明压力传感器。在这项工作中，报道了一种透明且线性的电容式压力传感器，其在5 - 100 kPa压力范围内的透过率超过85%且线性度高（ = 0.995）。为使传感器透明，在微结构化的“硬”弹性体层中填充了与“软”弹性体层折射率匹配的材料，从而使光散射最小化。通过传感器独特的结构实现了高线性度，该结构随着施加压力增加电容器的有效面积。这些特性使我们的传感器非常适合未来的3D触摸屏应用。
