Patent ID: 11892633
Assignee: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A display apparatus comprising:
an image providing device configured to provide an image; and
a combiner configured to combine light containing the image, which is emitted from the image providing device, and light containing an external landscape,
wherein the combiner comprises:
a transparent substrate; and
a plurality of volume gratings on the transparent substrate, the plurality of volume gratings being configured to diffract the light containing the image emitted from the image providing device,

wherein each volume grating of the plurality of volume gratings has a first surface and a second surface facing each other,
wherein each volume grating of the plurality of volume gratings is configured to diffract light incident on the first surface and transmit therethrough light incident on the second surface without diffraction, and
wherein a distance between two adjacent volume gratings of the plurality of volume gratings is greater than or equal to a width of each volume grating of the plurality of volume gratings.