Light-emitting display and method of manufacturing the same
View Patent ↗A light-emitting display capable of maintaining low power consumption and improving display quality irrespective of the configuration of an auxiliary wiring. A second electrode and an auxiliary wiring are electrically connected to each other through a conductive contact section. Moreover, only a part of the auxiliary wiring is connected to the contact section. Even if the surface of the auxiliary wiring is oxidized, an increase in connection resistance is prevented. Moreover, a restriction on layout is not imposed at the time of forming the contact section.
1. A light-emitting display comprising a plurality of drive elements and a first wiring layer electrically connected to the drive elements,
the light-emitting display comprising:
a first electrode respectively corresponding to one of the drive elements, and positioned over the drive element and the first wiring layer;
a light emission section over the first electrode;
a common second electrode formed of a material allowing light from the light emission section to pass therethrough and arranged over the light emission section;
a second wiring layer; and
a conductive contact layer electrically connecting the common second electrode and the second wiring layer, a portion of the common second electrode being in direct contact with the conductive contact layer, and a portion of the second wiring layer being positioned above and in direct contact with the conductive contact layer.
2. The light-emitting display of claim 1 , wherein the second wiring layer has a resistance lower than that of the common second electrode.
3. The light-emitting display of claim 1 , wherein the first wiring layer and the conductive contact layer are formed from one conductive layer.
4. The light-emitting display of claim 3 , wherein the common second electrode and the second wiring layer are partially connected to each other through the conductive contact layer.
5. The light-emitting display of claim 3 , wherein:
(a) the conductive layer is a multilayer film, the multilayer film including
a low etching selectivity film in at least an uppermost layer of the multilayer film and made of a material having relatively low etching selectivity with respect to the first electrode, and
a high etching selectivity film in a layer lower than the low etching selectivity film and made of a material having relatively high etching selectivity with respect to the first electrode, and
(b) the low etching selectivity film in the conductive contact layer is partially removed.
6. The light-emitting display of claim 5 , wherein:
a planarization insulating layer and an interelectrode insulating layer, each having an aperture in a region corresponding to the conductive contact layer, are between the conductive contact layer and the common second electrode, and
the interelectrode insulating layer is on the planarization insulating layer, and the aperture of the interelectrode insulating layer is inside of the aperture of the planarization insulating layer.
7. The light-emitting display of claim 3 , wherein:
the conductive layer is made of a material with relatively low etching selectivity with respect to the first electrode, and
an upper layer portion of the conductive contact layer is partially removed.
8. The light-emitting display according to claim 7 , wherein:
a planarization insulating layer and an interelectrode insulating layer each having an aperture in a region corresponding to the conductive contact layer are between the conductive contact layer and the common second electrode, and
the interelectrode insulating layer is on the planarization insulating layer, and the aperture of the interelectrode insulating layer is inside of the aperture of the planarization insulating layer.
9. The light-emitting display according to claim 1 , wherein:
an insulating layer having an aperture in a region corresponding to the conductive contact layer is between the conductive contact layer and the common second electrode, and
a side surface of the aperture has a step-like shape with a relatively wide top and a narrow bottom.
10. The light-emitting display according to claim 1 , wherein the conductive contact layer is made of a material having relatively high etching selectivity with respect to the first electrode.