Display device and method of anti-spoofing of the display device

A method of a display device including a fingerprint recognition sensor having a pixel array and a display panel with a plurality of display pixels, the method comprising:

• training a main processor by sequentially inputting a user fingerprint and a fake fingerprint to the fingerprint recognition sensor while a portion of display pixels, from among the plurality of display pixels, emit light, the portion of display pixels corresponding to a fingerprint recognition window of the display panel;
• generating, by the main processor, learning data comprising a fingerprint image signal and a fingerprint phase signal based on the training;
• generating, by the fingerprint recognition sensor, an input fingerprint image signal and an input fingerprint phase signal based on an input fingerprint;
• and
• authenticating, by the main processor, the input fingerprint by comparing the input fingerprint image signal and the input fingerprint phase signal with the learning data.

A display device comprising:

• a display panel comprising a plurality of display pixels;
• a fingerprint recognition sensor comprising an image sensor disposed under a first surface of the display panel at a location spatially corresponding to a fingerprint recognition window of the display panel;
• and
• a main processor configured to control the display panel and the fingerprint recognition sensor,
• wherein a portion of display pixels among the plurality of display pixels are configured to emit light in a fingerprint recognition mode, the portion of display pixels corresponding to the fingerprint recognition window,
• wherein the image sensor comprises a pixel array with a plurality of pixels, at least a portion of the plurality of pixels comprises phase detection pixels and the image sensor is configured to generate a fingerprint image signal and a fingerprint phase signal based on reflected light of a fingerprint, received through the fingerprint recognition window while the portion of display pixels emit light, and
• wherein the main processor is further configured to:
• perform any one or any combination of an anti-spoofing operation and a fingerprint authentication operation based on the fingerprint image signal and the fingerprint phase signal, the anti-spoofing operation being associated with determining whether the fingerprint is counterfeited;
• perform training to generate learning data based on a first fingerprint image signal and a first fingerprint phase signal generated by the image sensor according to a user fingerprint, and based on a second fingerprint image signal and a second fingerprint phase signal generated by the image sensor according to a fake fingerprint;
• and
• perform the anti-spoofing operation by comparing the fingerprint image signal and the fingerprint phase signal corresponding to the fingerprint with the learning data.