Flexible imagers can be placed in direct contact with a person’s skin, allowing vital signs to be monitored continuously. However, developing flexible imagers that offer both high definition and high speed has proved challenging. Here we show that a combination of polycrystalline silicon thin-film transistor readout circuits and organic photodiodes with high sensitivity in the near-infrared region can be used to create a conformable imager with a resolution of 508 pixels per inch, a speed of 41 frames per second and a total thickness of only 15 μm. The imager can read out a photocurrent of less than 10 pA with low noise, and can obtain static biometric signals, including images of fingerprints and veins, via soft contact with the skin. It can also be used to map a pulse wave, electronically selecting the best measurement location by analysing the area distribution.

灵活的成像仪可以直接与人的皮肤接触，从而可以连续监测生命体征。然而，开发提供高清晰度和高速的灵活成像仪已被证明具有挑战性。在这里，我们展示了多晶硅薄膜晶体管读出电路和在近红外区域具有高灵敏度的有机光电二极管的组合，可用于创建分辨率为 508 像素/英寸、速度为 41 帧/英寸的适形成像器。其次，总厚度仅为 15 μm。该成像仪可​​以低噪声读出小于10 pA的光电流，并通过与皮肤的软接触获得静态生物特征信号，包括指纹和静脉图像。它也可以用来绘制脉搏波，