High-Transmittance Sensor Module Integrates Fingerprint, Touch Functions

摘要

At a symposium at Display Week 2020 (SID2020), Japan Display Inc. (JDI) gave a presentation titled "Full-Screen Capacitive Fingerprint Sensor and Touch Sensor" (Paper No. 42.3). The contents of the presentation are discussed in this article. Fig. 1 shows the concepts of full-screen capacitive fingerprint sensor and touch sensor functions. The sensor is assumed to be used both as fingerprint sensor and touch sensor. In the touch sensing mode, the sensor exhibits fast sensing report rate and rough scan pitch. Meanwhile, in the fingerprint sensing mode, the scanning pitch is fine, and therefore, high-resolution image needs to be obtained. In addition, the sensor scan area for the fingerprint is limited to the touch area, leading to smaller image size and shorter scan time. The new sensor developed by JDI can achieve a frame scan time of 130msec or shorter in the fingerprint mode, when the scanning area is about 10×10mm.