The need for touch based authentication is growing rapidly in smartphones and tablets. Historically, fingerprint
has served at its fullest capacity in establishing the uniqueness of an individual’s identity. In this paper
we present a novel design of capacitive in-cell TFT-LCDs that supports both fingerprint scan and touch sensing
by extending the in-cell capacitive sensing scheme. We discuss a novel readout circuit design that drives the
capacitive sensors for touch interactions in low resolution and for fingerprint scan at higher resolution. Furthermore,
we propose to enhance the low resolution fingerprint data with image super resolution. Evaluation results
show that with super resolution, the proposed touch-fingerprint in-cell TFT-LCD design can support fingerprint
verification with sensor pitch of 0.15mm.