US 12,438,132 B2
Unit pixel for LED display and LED display apparatus having the same
Jong Min Jang, Ansan-si (KR); and Sung Hyun Lee, Ansan-si (KR)
Assigned to SEOUL VIOSYS CO., LTD., Ansan-si (KR)
Filed by SEOUL VIOSYS CO., LTD., Ansan-si (KR)
Filed on Apr. 12, 2022, as Appl. No. 17/719,323.
Claims priority of provisional application 63/174,769, filed on Apr. 14, 2021.
Prior Publication US 2022/0336427 A1, Oct. 20, 2022
Int. Cl. H01L 25/075 (2006.01); H01L 23/00 (2006.01); H10H 20/01 (2025.01); H10H 20/84 (2025.01)
CPC H01L 25/0756 (2013.01) [H01L 24/29 (2013.01); H01L 24/32 (2013.01); H01L 24/33 (2013.01); H10H 20/018 (2025.01); H10H 20/84 (2025.01); H01L 24/03 (2013.01); H01L 24/05 (2013.01); H01L 24/06 (2013.01); H01L 24/13 (2013.01); H01L 24/14 (2013.01); H01L 2224/039 (2013.01); H01L 2224/05558 (2013.01); H01L 2224/05573 (2013.01); H01L 2224/06179 (2013.01); H01L 2224/13006 (2013.01); H01L 2224/13013 (2013.01); H01L 2224/13023 (2013.01); H01L 2224/13082 (2013.01); H01L 2224/13109 (2013.01); H01L 2224/13144 (2013.01); H01L 2224/13147 (2013.01); H01L 2224/14179 (2013.01); H01L 2224/29082 (2013.01); H01L 2224/29186 (2013.01); H01L 2224/2919 (2013.01); H01L 2224/32148 (2013.01); H01L 2224/33181 (2013.01); H01L 2224/83005 (2013.01); H01L 2224/8393 (2013.01); H01L 2924/05442 (2013.01); H10H 20/013 (2025.01)] 19 Claims
OG exemplary drawing
 
1. A unit pixel, comprising:
a first light emitting stack;
a second light emitting stack disposed under the first light emitting stack, and having an area greater than that of the first light emitting stack;
a third light emitting stack disposed under the second light emitting stack, and having an area greater than that of the second light emitting stack; and
a first upper contact electrode disposed on the first light emitting stack,
wherein at least one of the first through third light emitting stacks includes a side surface having an inclination angle within a range of about 30 degrees to about 70 degrees with respect to a first plane parallel to a top surface of the third light emitting stack, and
wherein the first upper contact electrode includes a side surface including a first region with a first inclination angle within a range of about 20 degrees to about 70 degrees with respect to the first plane, and a second region with a second inclination angle within a range of about 20 degrees to about 70 degrees with respect to the first plane, wherein the second region is disposed above the first region and the second inclination angle is less than the first inclination angle.