Display device and manufacturing method thereof

1. A display device, comprising:

a substrate including a display region and a non-display region, the display region including a plurality of first pixels of a first type, a plurality of second pixels of a second type, and a plurality of third pixels of a third type with each of the first to third pixels having:

an emission region from which light is to be emitted;

a light emitting element in the emission region; and

a pixel circuit area to drive the light emitting element;

a dummy pattern extending, in plan view, along an extending direction substantially parallel to pixels of one pixel type among the first to third pixels, the dummy pattern extending through a non-emission region of the substrate located in the display region between adjacent pixels and not through any emission region, and disposed directly on a pixel defining layer that includes openings exposing a portion of respective pixel electrodes; and

a thin film encapsulation layer covering the dummy pattern and each of the emission regions.

2. The display device as claimed in claim 1 , wherein the dummy pattern extends between pixels of the other two pixel types of the first to third pixels other than pixels of the one pixel type.

3. The display device as claimed in claim 2 , wherein the light emitting element in each of the first to third pixels includes:

a first electrode electrically connected to the pixel circuit area;

an emitting layer on the first electrode with the pixel defining layer exposing a portion of the first electrode; and

a second electrode on the emitting layer.

4. The display device as claimed in claim 3 , wherein the dummy pattern includes:

an organic pattern on the pixel defining layer to correspond to the non-emission region; and

a conductive pattern on the organic pattern.

5. The display device as claimed in claim 4 , wherein:

the organic pattern is in a same layer as the emitting layer, and

the conductive pattern is in a same layer as the second electrode.

6. The display device as claimed in claim 4 , wherein:

the light emitting element includes a common electrode over the second electrode, and

the common electrode is commonly provided throughout the first to third pixels.

7. The display device as claimed in claim 6 , further comprising:

an auxiliary electrode disposed on the pixel defining layer to correspond to the non-emission region, the auxiliary electrode being disposed so as to be space apart from the dummy pattern.

8. The display device as claimed in claim 7 , wherein the auxiliary electrode electrically connects the second electrode and the common electrode.

9. The display device as claimed in claim 2 , wherein each first pixel of the plurality of first pixels, each second pixel of the plurality of second pixels, and each third pixel of the plurality of third pixels are to emit light of different colors.

10. The display device as claimed in claim 9 , wherein:

each first pixel is to emit red light,

each second pixel is to emit green light,

each third pixel is to emit blue light, and

each second pixel is smaller than each of the first and third pixels.

11. The display device as claimed in claim 10 , wherein the second pixels are consecutively arranged along a first direction of the substrate and are repeatedly disposed for every two rows in a second direction intersecting the first direction.

12. The display device as claimed in claim 11 , wherein:

two first pixels that are to emit red light, with one second pixel therebetween, extend along a diagonal direction of the first direction, and

two third pixels that are to emit blue light, with the one second pixel therebetween, extend along a diagonal direction of the second direction.

13. The display device as claimed in claim 12 , wherein one first pixel and one third pixel are alternately disposed along the second direction to form one pixel column.

14. The display device as claimed in claim 13 , wherein the dummy pattern extends along the diagonal direction of the second direction in which the two third pixels extend in the non-emission region.

15. The display device as claimed in claim 14 , wherein each of the first pixel, the second pixel, and the third pixel have a rhombus shape.

16. The display device as claimed in claim 1 , wherein:

the pixel circuit area includes at least one transistor on the substrate,

the at least one transistor is electrically connected to a first electrode, and

the at least one transistor includes:

a semiconductor layer on the substrate;

a gate electrode on the semiconductor layer with a gate insulating layer therebetween; and

a source electrode and a drain electrode, each of the source electrode and the drain electrode being connected to the semiconductor layer.

17. The display device as claimed in claim 1 , wherein the dummy pattern is disposed on and over the pixel defining layer.

18. A method for manufacturing a display device, the method comprising:

preparing a substrate including a display region and a non-display region;

forming a plurality of first pixels of a first type, a plurality of second pixels of a second type, and a plurality of third pixels of a third type with each of the first to third pixels having:

an emission region from which light is to be emitted; and

a light emitting element in the emission region;

forming a pixel circuit area, in each of the first to third pixels, to drive the respective light emitting element in each of the first to third pixels;

forming a dummy pattern extending, in plan view, along an extending direction substantially parallel to pixels of one pixel type among the first to third pixels, the dummy pattern extending through a non-emission region of the substrate located in the display region between adjacent pixels and not through any emission region, and disposed directly on a pixel defining layer that includes openings exposing a portion of respective pixel electrodes; and

covering the dummy pattern and each of the emission regions with a thin film encapsulation layer.

19. The method as claimed in claim 18 , further comprising forming the pixel defining layer which distinguishes the emission region from the non-emission region.

20. The method as claimed in claim 18 , further comprising:

forming a sacrificial layer and a photoresist layer on the pixel defining layer;

forming a photoresist pattern having a first opening by patterning the photoresist layer; and

forming a sacrificial pattern having a second opening, the second opening being larger than the first opening.

21. The method as claimed in claim 20 , wherein the first opening of the photoresist pattern in the non-emission region and the second opening of the sacrificial pattern in the non-emission region form a trench, the trench to receive an etchant used in etching the sacrificial layer.

22. The method as claimed in claim 21 , wherein, before etching the sacrificial layer, forming the dummy pattern in the trench.