ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20150311473A1
• Filed: 01/16/2015
• Published: 10/29/2015
• Est. Priority Date: 04/25/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Nam-Hee, Kim, Kwang-Min, Park, Jong-Ryuk, Lee, Kyung Jin, Lee, Sang Shin, Lee, Keun Soo, Lee, Sun Youl, Kim, Mi Kyung, Kim, Yang Wan, Yi, Sang Min
• Granted Patent: US 9,508,778 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 59/8723 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 71/166 using selective deposition, e.g. using a mask

Abstract

An organic light emitting device includes: a first substrate; a plurality of electrodes on the first substrate; a pixel definition layer on the plurality of electrodes and including a plurality of openings and respectively exposing the plurality of electrodes; and a spacer on the pixel definition layer, wherein the pixel definition layer includes a first opening and a second opening adjacent to each other along a first direction by an interval for each pixel, and a third opening adjacent to the first opening and the second opening by an interval along a second direction crossing the first direction, and wherein the spacer is at a crossing point of a first imaginary line extending in the first direction and passing between the first opening and the third opening and a second imaginary line extending in the second direction and passing between the first opening and the second opening.

Claims

1. An organic light emitting device comprising:

a first substrate;

a plurality of electrodes on the first substrate;

a pixel definition layer on the plurality of electrodes and comprising a plurality of openings and respectively exposing the plurality of electrodes; and

a spacer on the pixel definition layer,

wherein the pixel definition layer comprises a first opening and a second opening adjacent to each other along a first direction by an interval for each pixel, and a third opening adjacent to the first opening and the second opening by an interval along a second direction crossing the first direction, and

wherein the spacer is at a crossing point of a first imaginary line extending in the first direction and passing between the first opening and the third opening and a second imaginary line extending in the second direction and passing between the first opening and the second opening.

2. The organic light emitting device of claim 1, wherein

a first organic emission layer is at the first opening of the pixel definition layer where a first organic emission material is located, a second organic emission layer is at the second opening of the pixel definition layer where a second organic emission material is located, and a third organic emission layer is at the third opening of the pixel definition layer where a third organic emission material is located.

3. The organic light emitting device of claim 2, wherein

at least one of the first organic emission material, the second organic emission material, or the third organic emission material is on the pixel definition layer or the spacer.

4. The organic light emitting device of claim 1, wherein

the first imaginary line passes between the first opening and the third opening in one pixel, the second imaginary line passes between the first opening and the second opening respectively in pixels adjacent to each other in the first direction and adjacent to each other, and

the spacer comprises a first spacer at a crossing point of the first imaginary line and the second imaginary line.

5. The organic light emitting device of claim 4, further comprising

a third imaginary line extending in the first direction and passing between the first opening and the third opening in the pixels adjacent to each other in the second direction and adjacent to each other, and

the spacer comprises a second spacer at the crossing point of the second imaginary line and the third imaginary line.

6. The organic light emitting device of claim 5, wherein

the first spacer and the second spacer are alternately arranged for each pixel along the first direction.

7. The organic light emitting device of claim 5, wherein

the first spacer and the second spacer are alternately arranged for each pixel along the second direction.

8. The organic light emitting device of claim 5, wherein

the first spacer and the second spacer face away from each other with the third opening interposed therebetween and protrude in opposite directions to each other.

9. The organic light emitting device of claim 1, wherein

the spacer has a plane shape of a triangle.

10. The organic light emitting device of claim 9, wherein

the spacer has a first side extending in the first direction, and a first apex facing the first side protrudes toward a region between the first opening and the second opening.

11. The organic light emitting device of claim 1, wherein

the spacer has a first side extending in the first direction, and has a plane shape of a polygon having a protrusion facing the first side and protruding toward a region between the first opening and the second opening.

12. The organic light emitting device of claim 11, wherein

the spacer has a protrusion respectively protruding toward a region between the first opening and the second opening, and a region between the first opening or the second opening and the third opening.

13. The organic light emitting device of claim 1, wherein

the first imaginary line passes between the first opening and the third opening in one pixel,

further comprising a fourth imaginary line extending in the second direction and passing between the first opening and the second opening in one pixel, and

the spacer is at the crossing point of the first imaginary line and the fourth imaginary line.

14. The organic light emitting device of claim 13, wherein

the spacer is alternately arranged for one pixel along the first direction.

15. The organic light emitting device of claim 13, wherein

the spacer is alternately arranged for one pixel along the second direction.

16. The organic light emitting device of claim 13, wherein

the spacer has a plane shape of a triangle.

17. The organic light emitting device of claim 16, wherein

the spacer has a first side extending in the first direction, and a first apex facing the first side protrudes toward a region between the first opening and the second opening.

18. The organic light emitting device of claim 13, wherein

the spacer has a first side extending in the first direction and has a plane shape of a polygon having a protrusion facing the first side and protruding toward a region between the first opening and the second opening.

19. The organic light emitting device of claim 18, wherein

the spacer has a protrusion respectively protruding toward a region between the first opening and the second opening and a region between the first opening or the second opening and the third opening.

20. The organic light emitting device of claim 1, wherein,

in the spacer, a cross-sectional thickness of a center on the plane is greater than a cross-sectional thickness of an edge on the plane.

21. A method for manufacturing an organic light emitting device, the method comprising:

forming a plurality of electrodes on a first substrate;

forming a pixel definition layer to cover the plurality of electrodes on the first substrate;

forming a plurality of openings in the pixel definition layer to correspond to a plurality of electrodes to expose the plurality of electrodes;

forming a spacer on the pixel definition layer;

mounting a deposition mask having a mask opening corresponding to the opening of the pixel definition layer on the spacer; and

depositing an organic emission material through the mask opening,

wherein the pixel definition layer comprises a first opening and a second opening adjacent to each other along a first direction by an interval for each pixel, and a third opening adjacent to the first opening and the second opening by an interval along a second direction crossing the first direction,

wherein the spacer is at a crossing point of a first imaginary line extending in the first direction and passing between the first opening and the third opening and a second imaginary line extending in the second direction and passing between the first opening and the second opening, and

wherein an edge of the mask opening is separated from a top end of the spacer.

22. The method of claim 21, wherein

the edge of the mask opening has a corner formed with a curve.

23. The method of claim 21, wherein

the depositing of the organic emission material comprises

forming a first organic emission layer by depositing a first organic emission material at the first opening of the pixel definition layer, forming a second organic emission layer by depositing a second organic emission material at the second opening of the pixel definition layer, and forming a third organic emission layer by depositing a third organic emission material at the third opening of the pixel definition layer.