Display panel and method of manufacturing the same

1 . A display panel comprising:

a base layer;

a pixel definition layer disposed on the base layer and including a first light emitting opening passing through the pixel definition layer;

a bank disposed on the pixel definition layer and including a first bank opening passing through the bank and overlapping the first light emitting opening; and

a first light emitting element disposed in the first bank opening, the first light emitting element including

a first anode including at least a portion exposed through the first light emitting opening,

a first cathode that is in contact with the bank, and

a first light emitting pattern layer disposed between the first anode and the first cathode,

wherein the bank includes,

a first layer comprising an AlNiLa alloy; and

a second layer disposed on the first layer, the second layer comprising a MoTa alloy oxide.

2 . The display panel of claim 1 , wherein the first layer comprises an Al x Ni phase.

3 . The display panel of claim 2 , wherein the first cathode is in contact with the Al x Ni phase.

4 . The display panel of claim 1 , wherein

the AlNiLa alloy of the first layer is an aluminum-based alloy doped with nickel (Ni) and lanthanum (La),

a content of the nickel (Ni) is equal to or greater than about 0.5 at % and equal to or smaller than about 3.0 at %, and

a content of lanthanum (La) is equal to or greater than about 0.1 at % and equal to or smaller than about 0.5 at %.

5 . The display panel of claim 1 , wherein the second layer has a reflectance equal to or smaller than about 30%.

6 . The display panel of claim 1 , wherein

the MoTa alloy oxide of the second layer is a molybdenum-based alloy oxide doped with tantalum (Ta), and

a content of the tantalum (Ta) is equal to or greater than about 1.0 at % and equal to or smaller than about 15.0 at %.

7 . The display panel of claim 1 , wherein

the first layer has a thickness equal to or greater than about 6,000 angstroms and equal to or smaller than about 100,000 angstroms, and

the second layer has a thickness equal to or greater than about 400 angstroms and equal to or smaller than about 800 angstroms.

8 . The display panel of claim 1 , further comprising:

a driving voltage line providing a bias voltage,

wherein at least a portion of the driving voltage line is covered by the first layer.

9 . The display panel of claim 8 , wherein the driving voltage line and the first anode have a same structure.

10 . The display panel of claim 1 , wherein

the first layer comprises a first inner side surface that defines a first area of the first bank opening,

the second layer comprises a second inner side surface that defines a second area of the first bank opening,

the first inner side surface of the first layer is disposed inwardly of the second inner side surface of the second layer, and

the first cathode is in contact with the first inner side surface of the first layer.

11 . The display panel of claim 1 , further comprising:

a second light emitting element including

a second anode,

a second cathode that is in contact with the bank, and

a second light emitting pattern layer disposed between the second anode and the second cathode, wherein

the pixel definition layer includes a second light emitting opening passing through the pixel definition layer to expose at least a portion of the second anode,

the bank includes a second bank opening passing through the bank and overlapping the second light emitting opening, and

the second light emitting element is disposed in the second bank opening.

12 . The display panel of claim 1 , further comprising:

a first dummy pattern layer disposed on the bank and spaced apart from the first light emitting pattern layer, the first dummy pattern layer and the first light emitting pattern layer comprising a same material;

a second dummy pattern layer disposed on the first dummy pattern layer and spaced apart from the first cathode, the second dummy pattern layer and the first cathode comprising a same material; and

a lower encapsulation inorganic pattern layer overlapping the first light emitting opening and disposed on the first light emitting element, the first dummy pattern layer, and the second dummy pattern layer.

13 . A method of manufacturing a display panel, comprising:

providing a preliminary display panel comprising a base layer, an anode disposed on the base layer, and a preliminary pixel definition layer disposed on the base layer and covering the anode;

forming a first layer comprising an AlNiLa alloy on the preliminary pixel definition layer;

forming a second layer comprising a MoTa alloy oxide on the first layer;

patterning the first layer and the second layer to form a bank including a bank opening;

forming a light emitting pattern layer in the bank opening; and

forming a cathode in the bank opening to be in contact with the bank.

14 . The method of claim 13 , wherein the forming of the first layer is performed by a deposition process at a temperature equal to or greater than about 200 degrees Celsius and equal to or smaller than about 250 degrees Celsius.

15 . The method of claim 14 , wherein the forming of the second layer is performed by a deposition process at a temperature equal to or greater than about 200 degrees Celsius and equal to or smaller than about 250 degrees Celsius.

16 . The method of claim 14 , wherein an Al x Ni phase is formed on the first layer in the forming of the first layer or the forming of the second layer.

17 . The method of claim 13 , wherein

the patterning of the first layer and the second layer includes,

dry etching the first layer and the second layer to form a preliminary bank opening passing through the first layer and the second layer; and

wet etching the first layer and the second layer to form the bank opening from the preliminary bank opening,

the first layer comprises a first inner side surface that defines a first area of the bank opening,

the second layer comprises a second inner side surface that defines a second area of the bank opening, and

the first inner side surface is disposed inwardly of the second inner side surface in the wet etching of the first layer and the second layer.

18 . The method of claim 13 , further comprising:

dry etching the preliminary pixel definition layer to form a pixel definition layer including a light emitting opening overlapping the bank opening after the patterning of the first layer and the second layer and before the forming of the light emitting pattern layer.

19 . The method of claim 18 , further comprising:

wet etching a sacrificial pattern layer of the preliminary display panel, wherein

the sacrificial pattern layer is disposed on the anode and covered by the preliminary pixel definition layer in the providing of the preliminary display panel, and

the wet etching of the sacrificial pattern layer is performed to form a sacrificial opening overlapping the light emitting opening passing through the sacrificial pattern layer after the dry etching of the preliminary pixel definition layer and before the forming of the light emitting pattern layer.

20 . The method of claim 13 , wherein

a first dummy pattern layer is spaced apart from the light emitting pattern layer, the first dummy pattern layer is disposed on the bank, and the first dummy pattern layer is formed in the forming of the light emitting pattern layer,

the first dummy pattern layer and the light emitting pattern layer comprise a same material,

a second dummy pattern layer is spaced apart from the cathode, the second dummy pattern layer is disposed on the bank, and the second dummy pattern layer is formed in the forming of the cathode, and

the second dummy pattern layer and the cathode comprise a same material.

21 . An electronic device comprising:

a display panel; and

an input sensor,

the display panel comprising:

a base layer;

a pixel definition layer disposed on the base layer and including a first light emitting opening passing through the pixel definition layer;

a bank disposed on the pixel definition layer and including a first bank opening passing through the bank and overlapping the first light emitting opening; and

a first light emitting element disposed in the first bank opening, the first light emitting element including

a first anode including at least a portion exposed through the first light emitting opening,

a first cathode that is in contact with the bank, and

a first light emitting pattern layer disposed between the first anode and the first cathode,

wherein the bank includes,

a first layer comprising an AlNiLa alloy; and

a second layer disposed on the first layer, the second layer comprising a MoTa alloy oxide.