US 12,147,041 B2
Diffraction light guide plate
Seong Min Park, Daejeon (KR); Jeong Ho Park, Daejeon (KR); Sang Choll Han, Daejeon (KR); and Bu Gon Shin, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/436,559
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Mar. 2, 2020, PCT No. PCT/KR2020/002961
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/184885, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 10-2019-0028514 (KR), filed on Mar. 13, 2019.
Prior Publication US 2022/0206300 A1, Jun. 30, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 27/42 (2006.01); G02B 27/44 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0176 (2013.01); G02B 27/4205 (2013.01); G02B 27/44 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A diffraction light guide plate comprising first and second diffraction optical elements, wherein the first diffraction optical element is an element capable of receiving light incident onto the first diffraction optical element and outputting the received light toward the second diffraction optical element, and the second diffraction optical element is an element capable of emitting light therefrom out of the incident light from the first diffraction optical element, and
wherein the first diffraction optical element comprises a linear diffraction grating extending in a first direction,
the second diffraction optical element comprises first and second regions, and a third region existing between the first and second regions,
the first region comprises a linear diffraction grating extending in a second direction different from the first direction,
the second region comprises a linear diffraction grating extending in a third direction different from the first and second directions,
the third region comprises a diffraction grating in the form that the linear diffraction gratings of the first and second regions overlap, and
the first to third regions are disposed such that light incident from the first diffraction optical element is incident onto the first region without passing through the second and third regions, that light incident from the first diffraction optical element is incident onto the second region without passing through the first and third regions, and that light incident from the first diffraction optical element is incident onto the third region without passing through the first and second regions.