US 11,988,829 B2
Waveguide type display apparatus
Changkun Lee, Seoul (KR); Seokil Moon, Suwon-si (KR); Geeyoung Sung, Daegu (KR); Bongsu Shin, Seoul (KR); and Hongseok Lee, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Jul. 8, 2021, as Appl. No. 17/370,667.
Claims priority of application No. 10-2020-0175833 (KR), filed on Dec. 15, 2020.
Prior Publication US 2022/0187599 A1, Jun. 16, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 1/00 (2006.01); G02B 5/00 (2006.01); G02B 5/32 (2006.01)
CPC G02B 27/0101 (2013.01) [G02B 1/002 (2013.01); G02B 5/003 (2013.01); G02B 5/32 (2013.01); G02B 6/0026 (2013.01); G02B 6/005 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A waveguide type display apparatus comprising:
a first waveguide comprising a front surface and a rear surface;
a first coupler provided on the front surface of the first waveguide and configured to input light corresponding to an image into the first waveguide through the front surface of the first waveguide;
a second coupler provided on the front surface of the first waveguide and configured to output the light propagating through the first waveguide to outside of the first waveguide; and
an optical element provided on entirety of the rear surface of the first waveguide and comprising a volume grating configured to reduce leakage light from being emitted to an outside through the rear surface of the first waveguide, the leakage light being light that passes through the rear surface of the first waveguide without total internal reflection, among the light propagating inside the first waveguide.