Patent ID: 11892630
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 16:
17. The augmented reality device of claim 12, wherein the optical system comprises a fourth beam expanding unit, the fourth beam expanding unit comprising:
a light guide plate including an entrance surface to which the light from the light source is incident and an exit surface which is opposite to the entrance surface and which emits the incident light toward the display device;
a first input lattice formed on the light guide plate and diffracting the light such that the light from the light source is totally reflected in an inside of the light guide plate and travels in a first direction;
a second input lattice formed on the light guide plate and diffracting the light such that the light traveling in the first direction through the first input lattice is totally reflected in the inside of the light guide plate and travels in a second direction that is different from the first direction; and
an output lattice formed on the light guide plate, diffracting the light traveling to the inside of the light guide plate through the second input lattice and expanded in the second direction in a direction toward an outside of the light guide plate, and outputting the light.