US 11,892,662 B2
Diffraction light guide plate and method of manufacturing diffraction light guide plate
Jung Hwan Yoon, Daejeon (KR); Bu Gon Shin, Daejeon (KR); Jeong Ho Park, Daejeon (KR); Eun Kyu Her, Daejeon (KR); and So Young Choo, Daejeon (KR)
Assigned to LG CHEM LTD., Seoul (KR)
Appl. No. 16/644,144
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Oct. 23, 2018, PCT No. PCT/KR2018/012545
§ 371(c)(1), (2) Date Mar. 3, 2020,
PCT Pub. No. WO2019/083247, PCT Pub. Date May 2, 2019.
Claims priority of application No. 10-2017-0138685 (KR), filed on Oct. 24, 2017.
Prior Publication US 2020/0408969 A1, Dec. 31, 2020
Int. Cl. G02B 5/18 (2006.01); F21V 8/00 (2006.01); G02B 27/01 (2006.01); G03F 1/00 (2012.01); B23K 26/00 (2014.01)
CPC G02B 5/1857 (2013.01) [B23K 26/00 (2013.01); G02B 5/18 (2013.01); G02B 6/0016 (2013.01); G02B 27/0172 (2013.01); G03F 1/00 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A diffraction light guide plate, comprising:
a first diffraction substrate; and
a second diffraction substrate provided on the first diffraction substrate,
wherein the first diffraction substrate includes a first diffraction grating layer in direct contact with one surface of the first diffraction substrate and a second diffraction grating layer in direct contact with an opposite surface of the first diffraction substrate,
wherein the second diffraction substrate includes a third diffraction grating layer in direct contact with one surface of the second diffraction substrate and a stress compensation layer in direct contact with an opposite surface of the second diffraction substrate,
wherein the first diffraction grating layer separates light having a wavelength of 550 nm or more and 700 nm or less,
wherein the second diffraction grating layer separates light having a wavelength of 400 nm or more and 550 nm or less,
wherein the third diffraction grating layer separates light having a wavelength of 450 nm or more and 650 nm or less, and
wherein the stress compensation layer has stress in a same direction as a direction of stress of the third diffraction grating layer.