US 12,114,519 B2
Light-emitting element and display device
Naoto Inoue, Sakai (JP); and Chie Toridono, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/423,826
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Feb. 21, 2019, PCT No. PCT/JP2019/006644
§ 371(c)(1), (2) Date Jul. 16, 2021,
PCT Pub. No. WO2020/170399, PCT Pub. Date Aug. 27, 2020.
Prior Publication US 2022/0115618 A1, Apr. 14, 2022
Int. Cl. H10K 50/15 (2023.01); G09G 3/3275 (2016.01); H10K 50/16 (2023.01)
CPC H10K 50/15 (2023.02) [G09G 3/3275 (2013.01); H10K 50/16 (2023.02); G09G 2310/027 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
a light-emitting layer;
an upper electrode provided on a first side of the light-emitting layer; and
a lower electrode provided on a second side of the light-emitting layer opposite the first side,
wherein the lower electrode comprises a first electrode and a second electrode including a first gap between the first electrode and the second electrode, the second electrode having an area larger than an area of the first electrode,
the upper electrode comprises a third electrode and a fourth electrode including a second gap between the third electrode and the fourth electorde, the third electrode facing the first electrode and the second electrode, the fourth electrode facing the second electrode and having an area smaller than an area of the third electrode,
a first charge transport layer and a second charge transport layer are provided between the lower electrode and the light-emitting layer,
a third charge transport layer facing the first charge transport layer and a fourth charge transport layer facing the second charge transport layer are provided between the upper electrode and the light-emitting layer,
a first region, where the first electrode and the third electrode overlap, includes the first charge transport layer, the light-emitting layer, and the third charge transport layer,
a second region, being a portion of a region where the second electrode and the third electrode overlap, includes the first charge transport layer, the light-emitting layer, and the third charge transport layer,
a third region, being another portion of the region where the second electrode and the third electrode overlap, includes the second charge transport layer, the light-emitting layer, and the fourth charge transport layer,
a fourth region, where the second electrode and the fourth electrode overlap, includes the second charge transport layer, the light-emitting layer, and the fourth charge transport layer,
the first charge transport layer and the fourth charge transport layer are transport layers of a first carrier,
the second charge transport layer and the third charge transport layer are transport layers of a second carrier different from the first carrier,
the first carrier is a positive hole,
the second carrier is an electron,
the first charge transport layer and the fourth charge transport layer are hole transport layers, and
the second charge transport layer and the third charge transport layer are electron transport layers.