Electronic device and control method thereof

An electronic device comprising:

• a display generating light;
• a first optical lens including:
• a first surface facing the display, the first surface provided with the light from the display;
• and
• a second surface opposite to the first surface;
• a second optical lens including:
• a first surface facing the second surface of the first optical lens, the first surface of the second optical lens provided with the light from the first optical lens;
• and
• a second surface opposite to the first surface;
• a light guide including:
• an incidence surface facing the second surface of the second optical lens, the incidence surface provided with the light from the second surface of the second optical lens;
• a transmission surface spaced apart from the incidence surface, the transmission surface transmitting the light toward an outside of the light guide;
• and
• a reflector facing both the incidence surface and the transmission surface;
• a wearing sensor configured to sense whether the electronic device is worn on a user;
• and
• a controller electrically connected to the wearing sensor and the second optical lens, the controller is configured to provide the second optical lens with a control signal based on a sensed value from the wearing sensor,
• wherein the second optical lens is positioned between the first optical lens and the light guide,
• wherein the incidence surface is positioned between the first optical lens and the transmission surface, and
• wherein a shape of the second optical lens is changed when the control signal is changed.