Electronic apparatus and controlling method thereof

An electronic apparatus comprising:

• memory storing instructions;
• at least one processor including processing circuitry;
• an image output module;
• a variable polarization film;
• and
• an illumination sensor,
• wherein the instructions, when executed by the at least one processor individually or collectively, cause the electronic apparatus to:
• obtain first timing information to display a first test image and a second test image,
• obtain second timing information to control a change in the state of the variable polarization film based on the first timing information,
• alternately output, through the image output module, the first test image and the second test image based on the first timing information,
• alternately change, based on the second timing information, the variable polarization film to a first state configured to transmit a light oriented in a first direction or a second state configured to transmit a light oriented in a second direction,
• while the first test image or the second test image is being output, obtain, through the illumination sensor, a first illumination value group including a plurality of illumination values, and
• determine whether to correct one of the first timing information or the second timing information based on the first illumination value group.