P‐77: LTPS TDDI with Full‐screen Fingerprint Recognition

Abstract

A method of FTDI (Fingerprint Touch Display Integration), namely LTPS TDDI with full‐screen optical multi‐points fingerprint recognition function, is proposed. Display driven circuit, touch function and fingerprint image sensor are designed in the same LTPS TFT glass substrate. Partitions image collection design combined with skip‐frame driving are adopted to realize multi‐points fingerprint image collection. Photoconversion characteristics together with noise characteristics of fingerprint system are also presented. By improving sensitivity of APS circuit and decreasing readout noise, the FTDI can get a false rejection ratio <1.0% when single point fingerprint recognition mode is used.