Display device and mobile terminal including the same

A mobile terminal, comprising:

• a display panel configured to display an input image, and including a first pixel area and a second pixel area, the second pixel area including a plurality of sub-pixels and one or more light transmitting parts disposed between the plurality of sub-pixels;
• a display panel driver configured to write pixel data of the input image to pixels of the display panel;
• a cover glass disposed on a front surface of the display panel and extending to cover the entire second pixel area;
• a light source disposed under a rear surface of the display panel to face the second pixel area, and configured to generate infrared light which is to pass through one of the one or more light transmitting parts;
• a diffractive optical element formed on at least one of a thin film layer of a circuit layer or at least one of a thin film layer of a light emitting element layer included in the display panel,
• wherein the diffractive optical element is located within the cover glass and disposed only at a position facing the one of the one or more light transmitting parts of the second pixel area, the diffractive optical element configured to separate the infrared light from the light source into a plurality of dot beams;
• an infrared camera disposed under the rear surface of the display panel, and configured to convert the infrared light incident through the display panel into an electrical signal to output facial pattern data;
• and
• a host system configured to transmit the pixel data of the input image to the display panel driver, and process user authentication with respect to the facial pattern data received from the infrared camera.