	US 12,336,421 B2
	Electroluminescence display including banks with different heights
Dohong Kim, Paju-si (KR); and Howon Choi, Paju-si (KR)
Assigned to LG Display Co., Ltd., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Nov. 17, 2021, as Appl. No. 17/528,935.
Claims priority of application No. 10-2020-0184728 (KR), filed on Dec. 28, 2020.
Prior Publication US 2022/0208902 A1, Jun. 30, 2022
Int. Cl. H10K 59/88 (2023.01); H10K 50/82 (2023.01); H10K 50/844 (2023.01); H10K 59/122 (2023.01); H10K 59/131 (2023.01); H10K 59/80 (2023.01)

CPC H10K 59/88 (2023.02) [H10K 50/82 (2023.02); H10K 50/844 (2023.02); H10K 59/122 (2023.02); H10K 59/131 (2023.02); H10K 59/80521 (2023.02); H10K 59/873 (2023.02)]

20 Claims

1. An electroluminescence display comprising:

a transistor;

a planarization layer on the transistor;

a first bank on the planarization layer and having a first height with respect to an upper surface of the planarization layer and a second bank having a second height with respect to the upper surface of the planarization layer that is less than the first height where the first bank and second bank define an emission area on a substrate, an upper surface of the first bank extending from an upper surface of the second bank;

an anode electrode disposed at the emission area;

a light emitting layer disposed on the anode electrode in the emission area;

a dummy light emitting layer disposed on the upper surface of the second bank;

a cathode electrode disposed on the light emitting layer and the dummy light emitting layer;

a first protective layer disposed on the cathode electrode,

wherein the cathode electrode is disposed on the upper surface of the second bank, except on the upper surface of the first bank,

wherein the cathode electrode is in contact with the dummy light emitting layer on the second bank, except on the upper surface of the first bank,

wherein the first protective layer is in contact with the cathode electrode, except on the upper surface of the first bank, and

wherein portions of the cathode electrode disposed in the emission area are connected across an entirety of the substrate through portions of cathode electrode disposed on the upper surface of the second bank.

12. An electroluminescence display comprising:

a plurality of anode electrodes arrayed in a matrix on a substrate;

a plurality of banks defining an emission area on each of the plurality of anode electrodes, the plurality of banks including a plurality of protrusions that extend from an upper surface of one bank from the plurality of banks and have a first height and a plurality of depressions having a second height, each of the plurality of depressions between a pair of protrusions from the plurality of protrusions;

a light emitting layer disposed at the emission area and the plurality of depressions;

a cathode electrode disposed on an upper surface of each of the plurality of depressions and the light emitting layer but not on an upper surface of each of the plurality of protrusions; and

an encapsulation layer disposed on the plurality of protrusions and the cathode electrode,

wherein portions of the cathode electrode disposed in the emission area are connected across an entirety of the substrate through portions of cathode electrode disposed on the plurality of depressions, and

wherein the encapsulation layer is in contact with the upper surface of each of the plurality of protrusions, except the upper surface of each of the plurality of depressions.