US 12,069,889 B2
White organic light emitting device comprising reflective layer and display apparatus including the same
Sunghoon Lee, Seoul (KR); Wonjae Joo, Seongnam-si (KR); Sunjin Song, Seoul (KR); Hyun Koo, Seongnam-si (KR); and Sunghyun Han, Pohang-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Jan. 21, 2021, as Appl. No. 17/154,314.
Claims priority of application No. 10-2020-0031306 (KR), filed on Mar. 13, 2020.
Prior Publication US 2021/0288290 A1, Sep. 16, 2021
Int. Cl. H10K 50/856 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/17 (2023.01)
CPC H10K 50/856 (2023.02) [H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/171 (2023.02)] 23 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a first electrode;
a white organic light emission structure provided on the first electrode;
a second electrode provided on the white organic light emission structure; and
a reflective layer provided on an opposite side of the first electrode from the white organic light emission structure, the reflective layer comprising a first reflective region, a second reflective region, and a third reflective region having different heights from one another and forming different separation distances from the second electrode,
wherein a plurality of recesses are formed on an upper surface of the reflective layer in at most two of the first reflective region, the second reflective region, and the third reflective region, and
wherein the first electrode is provided on the upper surface of the reflective layer,
wherein for each recess of the plurality of recesses, a diameter of a top portion of the recess is substantially equal to a diameter of a bottom portion of the recess, and wherein a period between each of the recesses is constant in the at most two of the first reflective region, the second reflective region, and the third reflective region in which the plurality of recesses are formed.