Iris authentication method and device using display information

An electronic device for performing iris authentication, comprising:

• an image sensor;
• a display;
• and
• a control unit, comprising a processor configured to:
• display an object on the display;
• obtain at least a first partial region from an eye image obtained through the image sensor;
• adjust output characteristics of the display based on a result obtained based on a size of the at least the first partial region and a size of a region required for iris authentication;
• obtain at least a second partial region from another eye image obtained through the image sensor after the output characteristics of the display are adjusted;
• and
• perform the iris authentication by using an iris image included in the at least the second partial region and an object image that corresponds to the object displayed on the display and is included in the at least the second partial region.