ORGANIC LIGHT-EMITTING DISPLAY PANEL AND METHOD OF FABRICATING THE SAME

• US 20160133676A1
• Filed: 04/01/2015
• Published: 05/12/2016
• Est. Priority Date: 11/10/2014
• 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, Geun Tak
• Granted Patent: US 9,627,458 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 71/191 characterised by provisions for the orientation or alignment of the layer to be deposited

Abstract

An organic light-emitting display panel and a method of fabricating the same, the panel including a base substrate; a first electrode layer including a plurality of first electrodes arranged on the base substrate; a pixel-defining layer including partition walls that extend from the base substrate and that define a plurality of pixels; an organic light-emitting layer including a plurality of organic light-emitting patterns in the pixels, respectively; and a second electrode layer on the organic light-emitting layer, wherein the organic light-emitting layer includes a plurality of primer patterns, the plurality of primer patterns being respectively formed in the pixels, being separate from one another, and respectively overlapping the first electrodes, at least one of the primer patterns has an area different area from an area of the other primer patterns, and the primer patterns have an affinity for liquid that is higher than an affinity for liquid of the pixel-defining layer.

Claims

1. An organic light-emitting display panel, comprising:

a base substrate;

a first electrode layer including a plurality of first electrodes arranged on the base substrate;

a pixel-defining layer including partition walls that extend from the base substrate and that define a plurality of pixels;

an organic light-emitting layer including a plurality of organic light-emitting patterns in the pixels, respectively; and

a second electrode layer on the organic light-emitting layer,

wherein the organic light-emitting layer includes a plurality of primer patterns, the plurality of primer patterns;

being respectively formed in the pixels,

being separate from one another, and

respectively overlapping the first electrodes,

wherein at least one of the primer patterns has an area different area from an area of the other primer patterns, and

wherein the primer patterns have an affinity for liquid that is higher than an affinity for liquid of the pixel-defining layer.

2. The organic light-emitting display panel as claimed in claim 1, wherein:

the organic light-emitting layer includes first through third organic light-emitting patterns, which alternately appear at least once, and

at least one of the first through third organic light-emitting patterns has a thickness different from a thickness of the other organic light-emitting patterns.

3. The organic light-emitting display panel as claimed in claim 2, wherein a thickness of the first organic light-emitting pattern is represented by Equation (1):

L1=(λ

R/2)×

m 

 

(1)

in which L1 denotes the thickness of the first organic light-emitting pattern, λ

R denotes the wavelength of red light, and m is a natural number.

4. The organic light-emitting display panel as claimed in claim 2, wherein a thickness of the second organic light-emitting pattern is represented by Equation (2):

L2=(λ

G/2)×

m 

 

(2)

in which L2 denotes the thickness of the second organic light-emitting pattern, λ

G denotes the wavelength of green light, and m is a natural number.

5. The organic light-emitting display panel as claimed in claim 2, wherein a thickness of the third organic light-emitting pattern is represented by Equation (3):

L3=(λ

B/2)×

m 

 

(3)

in which L3 denotes the thickness of the second organic light-emitting pattern, λ

B denotes the wavelength of blue light, and m is a natural number.

6. The organic light-emitting display panel as claimed in claim 1, wherein the organic light-emitting layer further includes a hole injection layer between the primer patterns and the first electrodes.

7. The organic light-emitting display panel as claimed in claim 6, wherein, between the primer patterns and the second electrode layer, the organic light-emitting layer further includes at least one of an emission layer, a hole transport layer, an electron injection layer, and an electron transport layer.

8. The organic light-emitting display panel as claimed in claim 7, wherein at least one of the emission layer, the hole transport layer, the electron injection layer and the electron transport layer has liquid-philic properties.

9. The organic light-emitting display panel as claimed in claim 1, wherein:

the primer patterns include first through third primer patterns, which alternately appear at least once, and

the first through third primer patterns have areas that are different from one another.

10. The organic light-emitting display panel as claimed in claim 9, wherein at least one of the first through third primer patterns partially overlaps the pixel-defining layer in a cross-sectional view along a plane parallel to the base substrate.

11. The organic light-emitting display panel as claimed in claim 10, wherein:

two of the first through third primer patterns partially overlap the pixel-defining layer in a cross-sectional view along a plane parallel to the base substrate, and

one of the two primer patterns has a larger area of contact with the pixel-defining layer than the other primer pattern.

12. A method of fabricating an organic light-emitting display panel, the method comprising:

providing a base substrate including a plurality of first electrodes thereon;

forming a pixel-defining layer such that the pixel-defining layer includes partition walls that define a plurality of pixels and that extend from the base substrate that includes the plurality of first electrodes thereon;

forming an organic light-emitting layer such that the organic light-emitting layer includes a plurality of organic light-emitting patterns that are respectively formed in the pixels; and

forming a second electrode layer on the organic light-emitting layer,

wherein;

the organic light-emitting layer includes a plurality of primer patterns, which are formed separately in the pixels, respectively, and that overlap the first electrodes, respectively,

at least one of the primer patterns has an area that is different from an area of the other primer patterns, and

the primer patterns have an affinity for liquid that is higher than an affinity for liquid of the pixel-defining layer.

13. The method as claimed in claim 12, further comprising forming a hole injection layer such that the hole injection layer covers the first electrodes and the pixel-defining layer and is between the base substrate and the primer patterns.

14. The method as claimed in claim 12, wherein forming the organic light-emitting layer includes:

applying a primer layer that includes a liquid-philic material;

patterning the primer layer by using a mask, the mask including light-transmitting areas corresponding to the primer patterns; and

removing portions of the primer layer except for portions corresponding with the primer patterns.

15. The method as claimed in claim 12, wherein:

the organic light-emitting layer includes first through third organic light-emitting patterns, which alternately appear at least once, and

at least one of the first through third organic light-emitting patterns has a thickness different from a thickness of the other organic light-emitting patterns.

16. The method as claimed in claim 12, wherein forming the organic light-emitting layer includes forming, on the primer patterns, at least one of an emission layer, a hole transport layer, an electron injection layer, and an electron transport layer.

17. The method as claimed in claim 16, wherein forming the organic light-emitting layer further includes forming at least one of the emission layer, hole transport layer, electron injection layer, and the electron transport layer by using a single nozzle.

18. The method as claimed in claim 16, wherein:

the pixels are arranged in a matrix form, and

at least one of the hole transport layer, the electron injection layer, and the electron transport layer extends in a row direction or a column direction.

19. The method as claimed in claim 12, wherein:

the primer patterns include first through third primer patterns, which alternately appear at least once, and

at least one of the first through third primer patterns have an area that is different from an area of the other primer patterns.

20. The method as claimed in claim 19, wherein at least one of the first through third primer patterns partially overlaps the pixel-defining layer.