Organic electroluminescence display device comprising auxiliary wiring
View Patent ↗An organic electroluminescence display device is provided. The organic electroluminescence display device includes plural organic electroluminescence elements. Each organic electroluminescence element includes: (A) a lower electrode; (B) an insulating layer having an opening, in which a lower electrode is exposed at the bottom of the opening; (C) an auxiliary wiring; (D) a stacked structure provided from a portion over the lower electrode exposed at the bottom of the opening to a portion of the insulating layer surrounding the opening, including a light emitting layer made of an organic light-emitting material; and (E) an upper electrode. At least one layer of the stacked structure partially contacts the auxiliary wiring. The insulating layer and the auxiliary wiring are provided in common to the plurality of organic EL elements. The upper electrode covers the whole surface of the stacked structures and the auxiliary wiring.
1. An organic electroluminescence display device comprising a plurality of organic electroluminescence elements, each organic electroluminescence element including:
(A) a lower electrode;
(B) an insulating layer having an opening, in which a lower electrode is exposed at the bottom of the opening;
(C) an auxiliary wiring;
(D) a stacked structure provided from a portion over the lower electrode exposed at the bottom of the opening to a portion of the insulating layer surrounding the opening, including a light emitting layer made of an organic light-emitting material; and
(E) an upper electrode, wherein a portion of the upper electrode positioned over the auxiliary wiring is electrically connected to the auxiliary wiring through a two-layer structure layer including a charge injection layer and a charge transport layer, wherein the insulating layer and the auxiliary wiring are provided in common to plural organic EL elements, and wherein the upper electrode covers the stacked structures and the two-layer structure layer forming the plural organic EL elements without touching the insulating layer, and wherein the upper electrode partially contacts the light emitting layer of the stacked structure, and partially contacts the two-layer structure layer.
2. The organic electroluminescence display device according to claim 1 , wherein the two-layer structure layer extends also between the stacked structure positioned over the lower electrode and the upper electrode.
3. The organic electroluminescence display device according to claim 1 ,
wherein at least one layer of the stacked structure has a portion connected to the auxiliary wiring.
4. The organic electroluminescence display device according to claim 1 ,
wherein voltage falling between the auxiliary wiring and the upper electrode is equal to or less than 5 V when the current density of electric current flowing between the auxiliary wiring and the upper electrode is equal to or less than 10A/cm 2 .
5. The organic electroluminescence display device according to claim 1 ,
wherein the upper electrode is made of a conductive material including magnesium and the thickness of the upper electrode ranges from 4 nm to 20 nm.