US 11,990,565 B2
Display device using semiconductor light-emitting diodes
Jungsub Kim, Seoul (KR); Sunghyun Moon, Seoul (KR); Younghak Chang, Seoul (KR); and Jina Jeon, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/266,406
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Aug. 29, 2018, PCT No. PCT/KR2018/009958
§ 371(c)(1), (2) Date Feb. 5, 2021,
PCT Pub. No. WO2020/032313, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 10-2018-0091461 (KR), filed on Aug. 6, 2018.
Prior Publication US 2021/0313490 A1, Oct. 7, 2021
Int. Cl. H01L 21/78 (2006.01); H01L 25/075 (2006.01); H01L 33/38 (2010.01); H01L 33/40 (2010.01); H01L 33/44 (2010.01)
CPC H01L 33/38 (2013.01) [H01L 21/7806 (2013.01); H01L 25/0753 (2013.01); H01L 33/40 (2013.01); H01L 33/44 (2013.01); H01L 2933/0016 (2013.01); H01L 2933/0025 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A display device comprising:
a plurality of semiconductor light-emitting diodes,
wherein at least one of the plurality of semiconductor light-emitting diodes comprises:
a first conductive electrode and a second conductive electrode;
a first conductive semiconductor layer on which the first conductive electrode is disposed;
a second conductive semiconductor layer that overlaps with the first conductive semiconductor layer, and the second conductive electrode being disposed on the second conductive semiconductor layer;
an active layer disposed between the first conductive semiconductor layer and the second conductive semiconductor layer;
an undoped semiconductor layer disposed on the second conductive semiconductor layer; and
protrusions formed of a porous material allowing electropolishing, and on the undoped semiconductor layer,
wherein a surface on the undoped semiconductor layer has a first region, and a second region that is disposed inward of the first region,
wherein the second region contains the protrusions, and
wherein a surface roughness of the second region is greater than that of the first region.