Display apparatus capable of laterally shifting image

An augmented reality (AR) apparatus comprising:

• an image forming optical system configured to form an image to be displayed;
• an eyepiece optical system configured to provide the image formed by the image forming optical system to a pupil of an observer;
• an image shifting optical system disposed on an optical path between the image forming optical system and the eyepiece optical system, the image shifting optical system being configured to move in a direction perpendicular to an optical axis to shift the image formed by the image forming optical system in the direction perpendicular to the optical axis,
• an eye tracker comprising at least one processor configured to track a position of the pupil of the observer;
• a controller comprising at least one processor configured to control a position of the image shifting optical system based on a change of the position of the pupil of the observer provided from the eye tracker;
• and
• an actuator configured to move the image shifting optical system in the direction perpendicular to the optical axis based on a control of the controller.