DISPLAY DEVICE AND MANUFACTURING METHOD OF DISPLAY DEVICE

1 . A display device comprising:

a substrate;

a lower electrode provided above the substrate;

a rib formed of an inorganic insulating material and comprising an aperture overlapping the lower electrode;

a partition comprising a lower portion provided on the rib, and an upper portion provided on the lower portion and protruding from a side surface of the lower portion;

an organic layer provided on the lower electrode in the aperture, overlapping the rib, spaced apart from the partition and including a light emitting layer;

a sealing layer formed of an inorganic insulating material, provided above the organic layer and being in contact with the lower portion of the partition; and

an etching stopper layer provided between the rib and the sealing layer, and covering the rib between the organic layer and the partition, wherein

the etching stopper layer is formed of a material different from the sealing layer, and

an etching rate of the etching stopper layer is less than an etching rate of the sealing layer.

2 . The display device of claim 1 , wherein

the rib and the sealing layer are formed of silicon nitride.

3 . The display device of claim 1 , wherein

the etching stopper layer is in contact with the lower portion of the partition.

4 . The display device of claim 3 , further comprising an upper electrode provided on the organic layer, wherein

the etching stopper layer is the upper electrode.

5 . The display device of claim 4 , wherein

the upper electrode is formed of an alloy of magnesium and silver.

6 . The display device of claim 1 , further comprising:

an upper electrode provided on the organic layer;

a transparent layer provided on the upper electrode; and

an inorganic layer provided on the transparent layer, wherein

the etching stopper layer is the inorganic layer.

7 . The display device of claim 6 , wherein

the inorganic layer is formed of lithium fluoride or silicon oxide.

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

an upper electrode provided on the organic layer;

a transparent layer provided on the upper electrode; and

an inorganic layer provided on the transparent layer, wherein

the etching stopper layer is the upper electrode and the inorganic layer.

9 . A manufacturing method of a display device, comprising:

preparing a processing substrate by forming, above a substrate, a lower electrode, a rib comprising an aperture overlapping the lower electrode, and a partition including a lower portion provided on the rib and an upper portion provided on the lower portion and protruding from a side surface of the lower portion;

forming an organic layer on the lower electrode in the aperture;

forming an etching stopper layer on the organic layer and on the rib between the organic layer and the partition;

forming a sealing layer on the etching stopper layer;

forming a patterned resist on the sealing layer; and

applying dry etching to the sealing layer using the resist as a mask, wherein

when the dry etching is applied to the sealing layer, an etching rate of the etching stopper layer is less than an etching rate of the sealing layer.

10 . The manufacturing method of claim 9 , wherein

in an evaporation device which forms the etching stopper layer, an extension direction of a first evaporation source is inclined with respect to a normal of the substrate, and a material emitted from the first evaporation source is deposited on the processing substrate while the processing substrate is conveyed in one direction.

11 . The manufacturing method of claim 10 , wherein

in an evaporation device which forms the etching stopper layer, an extension direction of a second evaporation source is inclined with respect to the normal of the substrate, and a material emitted from the second evaporation source is deposited on the processing substrate while the processing substrate is conveyed in one direction,

the extension direction of the first evaporation source is different from the extension direction of the second evaporation source, and

the material emitted from the first evaporation source is same as the material emitted from the second evaporation source.

12 . The manufacturing method of claim 11 , wherein

the processing substrate is introduced into a single chamber which accommodates the first evaporation source and the second evaporation source.

13 . The manufacturing method of claim 11 , wherein

the processing substrate is introduced into a second chamber which accommodates the second evaporation source after the processing substrate is introduced into a first chamber which accommodates the first evaporation source.

14 . The manufacturing method of claim 9 , wherein

the rib and the sealing layer are formed of silicon nitride.

15 . The manufacturing method of claim 9 , wherein

after the organic layer is formed, an upper electrode as the etching stopper layer is formed on the organic layer.

16 . The manufacturing method of claim 15 , wherein

the upper electrode is formed of an alloy of magnesium and silver.

17 . The manufacturing method of claim 9 , further comprising:

forming an upper electrode on the organic layer after the organic layer is formed;

forming a transparent layer on the upper electrode; and

subsequently, forming an inorganic layer as the etching stopper layer on the transparent layer.

18 . The manufacturing method of claim 17 , wherein

the inorganic layer is formed of lithium fluoride or silicon oxide.

19 . The manufacturing method of claim 9 , further comprising:

forming an upper electrode as the etching stopper layer on the organic layer after the organic layer is formed;

forming a transparent layer on the upper electrode; and

subsequently, forming an inorganic layer as the etching stopper layer on the transparent layer.

20 . The manufacturing method of claim 19 , wherein

the upper electrode is formed of an alloy of magnesium and silver, and

the inorganic layer is formed of lithium fluoride or silicon oxide.