In this study, a mutual capacitive-type on-screen fingerprint sensor, which can recognize fingerprints on a display screen to provide smartphones with full-screen displays with a minimal bezel area, is fabricated. On-screen fingerprint sensors are fabricated using an indium tin oxide transparent conductor with a sheet resistance of ~10 Ω/sq. and a transmittance of ~94% (~86% with the substrate effect) in the visible wavelength range, and assembled onto a display panel. Even at this high transmittance, the electrodes can degrade the display quality when they are placed on the display. The interference between periodic display pixel arrays and sensor patterns can lead to the Moiré phenomenon. It is necessary to find an appropriate sensor pattern that minimizes the Moiré pattern, while maintaining the signal sensitivity. To search for appropriate patterns, a numerical calculation is carried out over wide ranges of pitches and rotation angles. The range is narrowed for an experimental evaluation, which is used to finally determine the sensor design. As the selected sensor pitches are too small to detect capacitance variations, three unit patterns are electrically connected to obtain a unit block generating a larger signal. By applying the selected sensor pattern and circuit driving by block, fingerprint sensing on a display is demonstrated with a prototype built on a commercial smartphone.

在这项研究中，制造了一种互电容式屏幕指纹传感器，它可以识别显示屏上的指纹，为智能手机提供具有最小边框面积的全屏显示。屏幕指纹传感器使用薄膜电阻约为 10 Ω/sq 的氧化铟锡透明导体制造。以及在可见光波长范围内的透射率为 ~94%（基板效应为 ~86%），并组装到显示面板上。即使在如此高的透射率下，电极放置在显示器上时也会降低显示质量。周期性显示像素阵列和传感器图案之间的干扰会导致莫尔现象。有必要找到合适的传感器图案，以最大限度地减少莫尔图案，同时保持信号灵敏度。为了寻找合适的模式，在广泛的节距和旋转角度范围内进行数值计算。该范围缩小用于实验评估，用于最终确定传感器设计。由于选定的传感器间距太小而无法检测电容变化，因此将三个单元图案电连接以获得产生更大信号的单元块。通过应用选定的传感器模式和按块驱动的电路，在商用智能手机上构建的原型展示了显示器上的指纹感应。三个单元图案电连接以获得产生更大信号的单元块。通过应用选定的传感器模式和按块驱动的电路，在商用智能手机上构建的原型展示了显示器上的指纹感应。三个单元图案电连接以获得产生更大信号的单元块。通过应用选定的传感器模式和按块驱动的电路，在商用智能手机上构建的原型展示了显示器上的指纹感应。