![]() For this type of smartphone, fingerprint sensors, formerly located under the home button, have to be positioned on the back or side of the smartphone. 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.įull-screen smartphones with extremely thin bezels without physical buttons on the front have become the mainstream in the smartphone industry in recent years. 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. The range is narrowed for an experimental evaluation, which is used to finally determine the sensor design. To search for appropriate patterns, a numerical calculation is carried out over wide ranges of pitches and rotation angles. It is necessary to find an appropriate sensor pattern that minimizes the Moiré pattern, while maintaining the signal sensitivity. The interference between periodic display pixel arrays and sensor patterns can lead to the Moiré phenomenon. Even at this high transmittance, the electrodes can degrade the display quality when they are placed on the display. and a transmittance of ~94% (~86% with the substrate effect) in the visible wavelength range, and assembled onto a display panel. On-screen fingerprint sensors are fabricated using an indium tin oxide transparent conductor with a sheet resistance of ~10 Ω/sq.
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