Optical device for augmented reality having improved light efficiency

An optical device for augmented reality having improved light efficiency, the optical device comprising:

• a reflector configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, to a pupil of an eye of a user by reflecting the augmented reality image light toward the pupil, thereby providing the image for augmented reality to the user;
• and
• an optical lens adapted such that the reflector is embedded and disposed therein, and configured to transmit at least part of real object image light, which is image light output from a real object, therethrough toward the pupil of the eye of the user;
• wherein the optical lens includes a first surface through which the augmented reality image light reflected from the reflector and at least part of the real object image light goes toward the pupil of the user and a second surface being opposite to the first surface and into which the real object image light enters;
• wherein the reflector includes a plurality of reflective units having a size of 4 mm or less that are embedded and arranged inside the optical lens to transfer the augmented reality image light, transferred to the reflector, to the pupil of the user by reflecting the augmented reality image light;
• wherein at least two reflective units of the plurality of reflective units are arranged closer to the second surface of the optical lens as a distance from the image output unit increases;
• and
• wherein, when the optical device for augmented reality is placed in front of the pupil of the user, assuming that a forward direction from the pupil is referred to as an x axis, any one of line segments being parallel to a vertical line between the image output unit and the x axis along the x axis and passing between the first and second surfaces of the optical lens is referred to as an y axis and a line segment perpendicular to both the x axis and the y axis is referred to as an z axis, then each of the plurality of reflective units is formed in bar shapes extending in a z-axis direction.

An optical device for augmented reality having improved light efficiency, the optical device comprising:

• a reflector configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, to a pupil of an eye of a user by reflecting the augmented reality image light toward the pupil, thereby providing the image for augmented reality to the user;
• and
• an optical lens adapted such that the reflector is embedded and disposed therein, and configured to transmit at least part of real object image light, which is image light output from a real object, therethrough toward the pupil of the eye of the user;
• wherein the optical lens includes a first surface through which the augmented reality image light reflected from the reflector and at least part of the real object image light go toward the pupil of the user, and a second surface being opposite to the first surface and into which the real object image light enters;
• wherein the reflector includes a plurality of reflective units having a size of 4 mm or less that are embedded and arranged inside the optical lens to transfer the augmented reality image light, transferred to the reflector, to the pupil of the user by reflecting the augmented reality image light;
• wherein the reflector includes a first reflective unit group comprising reflective units embedded and arranged inside the optical lens so that the reflective units are arranged closer to the first surface of the optical lens as a distance from the image output unit increases, and a second reflective unit group comprising reflective units embedded and arranged inside the optical lens so that the reflective units are arranged farther from the first surface of the optical lens as a distance from the image output unit increases;
• and
• wherein the first reflective unit group and the second reflective unit group are arranged such that a distance between the second reflective unit group and the image output unit is larger than a distance between the first reflective unit group and the image output unit.