P‐76: Adaptive Phase‐Correction Scheme for Enhancing the Sensing Image Quality of an Ultrasonic Fingerprint‐Sensor Integrated OLED System

Abstract

In this work, we proposed the modified phase correction approach to enhance the fingerprint image quality of the ultrasonic fingerprint sensor on display (FoD). The mechanical wave is diffracted at the boundary between the finger and display panel so that the interference pressure is captured by the sensor. Diffracted waves play a critical role in enhancing sensing images. To correct the diffracted patterns, the corresponding point spread function (PSF) based convolution has been generally required in the conventional approach. In this study, we proposed a modified phase correction method using the sinusoidal implicit typed function, which is derived from the desired magnitude and phase spectrum based on the analyzed pressure distribution. The proposed approach is available for the multi‐physical structure such as acoustic, elastic and viscoelastic mediums in the multi‐layered structure. We verified the proposed approach to be a useful process for diffraction correction in comparison with the numerical and experimental results.