US 12,170,308 B2
Light emitting display apparatus
Dongmyung Lee, Paju-si (KR); Yonghoon Choi, Paju-si (KR); Sookang Kim, Paju-si (KR); and Jintae Kim, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG DISPLAY CO., LTD., Seoul (KR)
Filed on Dec. 8, 2021, as Appl. No. 17/545,336.
Claims priority of application No. 10-2020-0179574 (KR), filed on Dec. 21, 2020.
Prior Publication US 2022/0199680 A1, Jun. 23, 2022
Int. Cl. H01L 27/15 (2006.01); H01L 33/38 (2010.01); H01L 33/50 (2010.01); H01L 33/62 (2010.01)
CPC H01L 27/156 (2013.01) [H01L 33/38 (2013.01); H01L 33/50 (2013.01); H01L 33/62 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A light emitting display apparatus, comprising:
a substrate including a plurality of pixels each including an emission area;
a light extraction pattern including a plurality of concave portions in the emission area; and
a light emitting portion over the light extraction pattern,
wherein at least one of the plurality of concave portions has a curvature of 0.217 μm−1 to 0.311 μm−1,
wherein the light extraction pattern further comprises a plurality of protruding portions, each of the plurality of protruding portions is on respective adjacent sides of each of the plurality of concave portions,
wherein the protruding portion comprises:
a plurality of peak portions respectively provided between three adjacent concave portions; and
a plurality of ridge portions connecting two adjacent peak portions and/or being provided between two adjacent concave portions, and
wherein a height of each of the peak portions from a center point of an adjacent concave portion is less than a curvature radius at said center point of said adjacent concave portion.