Display panel and method for manufacturing the same

1 . A display panel comprising:

a base layer;

a pixel defining film disposed on the base layer, wherein a light-emitting opening is defined in the pixel defining film;

a partitioning wall which is disposed on the pixel defining film and in which a partitioning wall opening corresponding to the light-emitting opening is defined, the partitioning wall including:

a first partitioning wall layer disposed on the pixel defining film and defining a first portion of a first area of the partitioning wall opening;

a second partitioning wall layer disposed on the first partitioning wall layer and defining a second portion of the first area and a first portion of a second area of the partitioning wall opening; and

a third partitioning wall layer disposed on the second partitioning wall layer and defining a second portion of the second area of the partitioning wall opening;

a sacrificial pattern disposed between the anode and the pixel defining film, wherein a sacrificial opening overlapping the light-emitting opening is defined in the sacrificial pattern; and

a light-emitting element disposed in the partitioning wall opening, the light-emitting element including:

an anode;

a middle layer; and

a cathode contacting the partitioning wall.

2 . The display panel of claim 1 , wherein the first partitioning wall layer includes an indium zinc oxide.

3 . The display panel of claim 1 , wherein the second partitioning wall layer includes a molybdenum tantalum alloy oxide.

4 . The display panel of claim 1 , wherein the third partitioning wall layer includes an aluminum oxide.

5 . The display panel of claim 1 , wherein the third partitioning wall layer includes a material having a Young's modulus of about 300 gigapascals or greater.

6 . The display panel of claim 1 , wherein a thickness of the first partitioning wall layer is in a range of about 1000 angstroms to about 2500 angstroms.

7 . The display panel of claim 1 , wherein a thickness of the second partitioning wall layer is in a range of about 4000 angstroms to about 5000 angstroms.

8 . The display panel of claim 1 , wherein light transmittance of the second partitioning wall layer is about 0.5% or lower.

9 . The display panel of claim 1 , wherein a thickness of the third partitioning wall layer is in a range of about 500 angstroms to about 1000 angstroms.

10 . The display panel of claim 1 , wherein the partitioning wall has an undercut shape and the cathode contacts an inner side face of the first partitioning wall layer of the partitioning wall.

11 . The display panel of claim 1 , wherein the sacrificial pattern includes an azo compound.

12 . A display panel comprising:

a base layer;

a pixel defining film which is disposed on the base layer and in which a light-emitting opening is defined;

a partitioning wall which is disposed on the pixel defining film and in which a partitioning wall opening corresponding to the light-emitting opening is defined, the partitioning wall including:

a first partitioning wall layer disposed on the pixel defining film and including an indium zinc oxide;

a second partitioning wall layer disposed on the first partitioning wall layer and including a molybdenum-tantalum alloy oxide; and

a third partitioning wall layer disposed on the second partitioning wall layer, and including an aluminum oxide; and

a light-emitting element disposed in the partitioning wall opening, the light-emitting element including:

an anode;

a middle layer; and

a cathode contacting the partitioning wall.

13 . The display panel of claim 12 , wherein the first partitioning wall layer and a first portion of the second partitioning wall layer define a first area of the partitioning wall opening, and

wherein a second portion of the second partitioning wall layer and the third partitioning wall layer define a second area of the partitioning wall opening.

14 . The display panel of claim 12 , further comprising a sacrificial pattern disposed on the anode, wherein the sacrificial pattern includes an azo compound, wherein a sacrificial opening overlapping the light-emitting opening is defined in the sacrificial pattern.

15 . The display panel of claim 12 , wherein a thickness of the first partitioning wall layer is in a range of about 1000 angstroms to about 2500 angstroms,

wherein a thickness of the second partitioning wall layer is in a range of about 4000 angstroms to about 5000 angstroms, and

wherein a thickness of the third partitioning wall layer is in a range of about 500 angstroms to about 1000 angstroms.

16 . The display panel of claim 12 , wherein light transmittance of the second partitioning wall layer is about 0.5% or lower, and

wherein the third partitioning wall layer includes a material having a Young's modulus of about 300 gigapascals or greater.

17 . A method for manufacturing a display panel, the method comprising:

providing a pre-display panel, the pre-display panel including a base layer, an anode disposed on the base layer, and a pre-pixel defining film disposed on the base layer;

forming a first pre-partitioning wall layer including an indium zinc oxide on the pre-display panel;

forming a second pre-partitioning wall layer including a molybdenum-tantalum alloy oxide on the first pre-partitioning wall layer;

forming a third pre-partitioning wall layer including an aluminum oxide on the second pre-partitioning wall layer;

etching the first to third pre-partitioning wall layers and forming a partitioning wall in which a partitioning wall opening is defined; and

forming a light-emitting pattern and a cathode which contacts the partitioning wall in the partitioning wall opening.

18 . The method of claim 17 , wherein the etching the first to third pre-partitioning wall layers and the forming the partitioning wall in which the partitioning wall opening is defined include:

performing first etching of the first to third pre-partitioning wall layers; and

performing second etching of the first pre-partitioning wall layer and the second pre-partitioning wall layer and forming a first partitioning wall layer, a second partitioning wall layer, and a third partitioning wall layer,

wherein the first partitioning wall layer and a first portion of the second partitioning wall layer define a first area of the partitioning wall opening,

wherein a second portion of the second partitioning wall layer and the third partitioning wall layer define a second area of the partitioning wall opening, and

wherein the second area has a width different from a width of the first area.

19 . The method of claim 17 , wherein the pre-display panel further includes a pre-sacrificial pattern disposed between the anode and the pre-pixel defining film,

wherein the pre-sacrificial pattern includes an azo compound, and

wherein the method further comprises etching the pre-sacrificial pattern to form a sacrificial pattern in which a sacrificial opening overlapping the anode is defined.