Flat display device including an overflow barrier

1. A flat display device, comprising:

a substrate;

a first electrode on the substrate;

a second electrode above the first electrode;

a pixel region comprising a light emitting layer interposed between the first electrode and the second electrode; and

barriers formed on the substrate at a periphery portion of the pixel region and with at least one layer, each of the barriers having a groove formed in at least one side thereof, the groove being arranged between adjacent first electrodes,

wherein the groove has a depth less than 0.1 μm.

2. The device of claim 1 , wherein the grooves have a striped pattern.

3. The device of claim 2 , wherein neighboring pixel regions are separated by the barriers with the grooves and include different light-emitting layers.

4. The device of claim 3 , wherein the barriers surround one or more pixel regions.

5. The device of claim 1 , wherein the barrier is formed from a photo-resist.

6. The device of claim 5 , wherein the photo-resist in an inkjet printing substrate is composed of a material selected from the group consisting of a Novolak basis, an acrylic laquer, an epoxy laquer, and a polyamide laquer.

7. The device of claim 1 , wherein the barrier has a height less than 1 μm.

8. The device of claim 1 , wherein the light-emitting portion further comprises a charge carrier layer interposed between either the first electrode layer and the light-emitting layer or the light-emitting layer and the second electrode layer.

9. The device of claim 1 , wherein the barriers are formed such that neighboring pixels are symmetrical about each of the barriers.

10. The device of claim 9 , wherein the groove is arranged in the middle of the barrier.

11. The device of claim 1 , wherein the substrate is composed of a material selected from the group consisting of glass, a synthetic material, and silicon.

12. The device of claim 1 , wherein the barrier comprises:

a first barrier layer neighboring the first electrode layer and defining the pixel regions;

a second barrier layer having the groove formed thereon.

13. The device of claim 12 , wherein the second barrier layer is formed of a photo-resist.

14. The device of claim 13 , wherein, the photo-resist is composed of a material selected from the group of a conventional photo-resist on a Novolak basis, an acrylic laquer, an epoxy laquer, or a polyamid laquer.

15. The device of claim 1 , wherein the light-emitting portion is an organic electroluminescent portion.

16. A flat display device, comprising:

a substrate;

a first electrode on the substrate;

a second electrode above the first electrode;

a pixel region comprising a light emitting layer interposed between the first electrode and the second electrode; and

barriers formed on a periphery portion of the pixel region and with at least one layer, each of the barriers having a groove formed in at least one side thereof,

wherein the grooves have a mesh pattern and have a depth less than 0.1 μm.

17. The device of claim 16 , wherein at least one of the pixel regions is surrounded by identical mesh grooves and includes light-emitting layers emitting identical colors.

18. A flat display device, comprising:

a substrate;

a first electrode on the substrate;

a second electrode above the first electrode;

a pixel region comprising a light emitting layer interposed between the first electrode and the second electrode; and

barriers formed on a periphery portion of the pixel region and with at least one layer, each of the barriers having a groove formed on at least one side thereof,

wherein the groove has a depth of less than 0.1 μm.