Lightweight optical device for augmented reality using state change optical element

A lightweight optical device for augmented reality using a state change optical element, the lightweight optical device comprising:

• an optical means configured to transmit at least part of real object image light therethrough toward a pupil of an eye of a user;
• a reflective unit disposed inside the optical means, and configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, toward the pupil of the eye of the user by reflecting the augmented reality image light, thereby providing the image for augmented reality to the user;
• and
• a light transmission adjustment means disposed on an outer surface or inner surface of a first surface of the optical means on which the real object image light is incident;
• wherein the reflective unit is formed of a state change optical element whose reflectance for reflection of light and transmittance are changed in response to a control signal of the controller;
• and
• wherein the light transmission adjustment means is formed of a state change optical element whose reflectance for reflection of light and transmittance are changed in response to a control signal of a controller.