Organic light-emitting display device

• US 10,224,377 B2
• Filed: 05/25/2017
• Issued: 03/05/2019
• Est. Priority Date: 07/05/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Sungkook, Kim, Minwoo, Kim, Woongsik
• Primary Examiner(s): Ahmadi, Mohsen
• Application Number:
  US15/605,307
• Publication Number:
  US 20180012940A1
• Time in Patent Office: 649 Days
• CPC Class Codes: H01L 27/14627 Microlenses
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• 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 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

An organic light-emitting display device with improved light efficiency includes a plurality of pixel electrodes each corresponding one of at least a first, second, or third pixel; a pixel-defining layer covering an edge and exposing a central portion of the pixel electrodes; an intermediate layer over the pixel electrode and including an emission layer; an opposite electrode over the intermediate layer; and a lens layer over the opposite electrode and including a plurality of condensing lenses each having a circular lower surface. An area of the portion of the pixel electrode exposed by the pixel-defining layer is A, and an area of the lower surface of the condensing lens is B. For the first pixel, a ratio B/A ranges from about 1.34 to about 2.63. For the second pixel, B/A ranges from about 1.43 to about 3.00, For the third pixel, B/A ranges from about 1.30 to about 2.43.

Claims

1. An organic light-emitting display device comprising:

a plurality of pixel electrodes, each corresponding to one of at least a first pixel, a second pixel, and a third pixel;

a pixel-defining layer covering an edge of each of the pixel electrodes and exposing a central portion of each of the pixel electrodes;

an intermediate layer over the pixel electrode, the intermediate layer comprising an emission layer;

an opposite electrode over the intermediate layer; and

a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses each having a circular lower surface,

wherein an area of the central portion of a pixel electrode corresponding to the first pixel and exposed by the pixel-defining layer is Ar, an area of the lower surface of a condensing lens over the first pixel is Br, and the ratio Br/Ar ranges from about 1.34 to about 2.63;

wherein an area of the central portion of a pixel electrode corresponding to the second pixel and exposed by the pixel-defining layer is Ag, an area of the lower surface of a condensing lens over the second pixel is Bg, and the ratio Bg/Ag ranges from about 1.43 to about 3.00;

wherein an area of the central portion of a pixel electrode corresponding to the third pixel and exposed by the pixel-defining layer is Ab, an area of the lower surface of a condensing lens over the third pixel is Bb, and the ratio Bb/Ab ranges from about 1.30 to about 2.43; and

wherein the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the opposite electrode, the second lens layer having a refractive index less than the refractive index of the first lens layer, wherein the second lens layer comprises a concave portion concave in a direction toward the opposite electrode, the first lens layer fills the concave portion, and the area of the lower surface of the condensing lens is an area of the concave portion of the second lens layer in a surface in a direction to the first lens layer.

2. The display device of claim 1, wherein the ratio Br/Ar is about 1.62, the ratio Bg/Ag is about 1.77, and the ratio Bb/Ab is about 1.55.

3. The display device of claim 1, wherein the concave portion has a depth of about ⅖

to about ⅗

of a thickness of a non-concave portion of the second lens layer.

4. The display device of claim 1, wherein the second lens layer comprises a photoresist.

5. The display device of claim 1, wherein the second lens layer comprises acrylate.

6. The display device of claim 1, wherein the first lens layer or the second lens layer comprises a material cured by irradiation of an ultraviolet ray.

7. The display device of claim 1, wherein the first lens layer comprises siloxane and at least one of zirconium oxide, aluminum oxide, and titanium oxide.

8. The display device of claim 1 further comprising an encapsulation layer including at least one inorganic encapsulation layer and at least one organic encapsulation layer, wherein the lens layer is directly disposed on the encapsulation layer.

9. An organic light-emitting display device comprising:

a plurality of pixel electrodes, each corresponding to one of at least a red pixel, a green pixel, and a blue pixel;

a pixel-defining layer covering an edge of each of the pixel electrodes and exposing a central portion of each of the pixel electrodes;

an intermediate layer over the pixel electrode, the intermediate layer including an emission layer;

an opposite electrode over the intermediate layer; and

a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses each having a quadrangular lower surface,

wherein an area of the central portion of a pixel electrode corresponding to the red pixel and exposed by the pixel-defining layer is Ar, an area of the lower surface of a condensing lens over the red pixel is Br, and the ratio Br/Ar ranges from about 1.71 to about 3.36;

wherein an area of the central portion of a pixel electrode corresponding to the green pixel and exposed by the pixel-defining layer is Ag, an area of the lower surface of a condensing lens over the green pixel is Bg, and the ratio Bg/Ag ranges from about 1.83 to about 3.82;

wherein an area of the central portion of a pixel electrode corresponding to the blue pixel and exposed by the pixel-defining layer is Ab, an area of the lower surface of a condensing lens over the blue pixel is Bb, and the ratio Bb/Ab ranges from about 1.66 to about 3.09; and

wherein the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the opposite electrode, the second lens layer having a refractive index less than the refractive index of the first lens layer, wherein the second lens layer comprises a concave portion concave in a direction toward the opposite electrode, the first lens layer fills the concave portion, and an area of the lower surface of the condensing lens is an area occupied by the concave portion in a surface of the second lens layer in a direction of the first lens layer.

10. The display device of claim 9, wherein the ratio Br/Ar is about 2.07, the ratio Bg/Ag is about 2.26, and the ratio Bb/Ab is about 1.98.

11. The display device of claim 9, wherein the concave portion has a depth of about ⅖

to about ⅗

of a thickness of a non-concave portion of the second lens layer.

12. The display device of claim 9, wherein the second lens layer comprises a photoresist.

13. The display device of claim 9, wherein the second lens layer comprises acrylate.

14. The display device of claim 9, wherein the first lens layer or the second lens layer comprises a material cured by irradiation of an ultraviolet ray.

15. The display device of claim 9, wherein the first lens layer comprises siloxane and at least one of zirconium oxide, aluminum oxide, and titanium oxide.

16. An organic light-emitting display device comprising:

a plurality of pixel electrodes, each corresponding to one of at least a red pixel, a green pixel, and a blue pixel;

a pixel-defining layer covering an edge of each of the pixel electrodes and exposing a central portion of each of the pixel electrodes;

an intermediate layer over the pixel electrode, the intermediate layer including an emission layer;

an opposite electrode over the intermediate layer; and

a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses each having a polygonal lower surface,

wherein an area of the central portion of a pixel electrode corresponding to the red pixel and exposed by the pixel-defining layer is Ar, an area of a biggest circle that would fit inside the polygonal lower surface of a condensing lens over the red pixel is Br, and the ratio Br/Ar ranges from about 1.34 to about 2.63;

wherein an area of the central portion of a pixel electrode corresponding to the green pixel and exposed by the pixel-defining layer is Ag, an area of a biggest circle that would fit inside the polygonal lower surface of a condensing lens over the green pixel is Bg, and the ratio Bg/Ag ranges from about 1.43 to about 3.00;

wherein an area of the central portion of a pixel electrode corresponding to the blue pixel and exposed by the pixel-defining layer is Ab, an area of a biggest circle that would fit inside the polygonal lower surface of a condensing lens over the blue pixel is Bb, and the ratio Bb/Ab ranges from about 1.30 to about 2.43; and

wherein the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the opposite electrode, the second lens layer having a refractive index less than the refractive index of the first lens layer, wherein the second lens layer comprises a plurality of concave portions each concave in a direction toward the opposite electrode, the first lens layer fills the concave portions, and each of the areas Br, Bg, and Bb is an area of a circle of a maximum size inside a corresponding concave portion in a surface of the second lens layer in a direction to the first lens layer.

17. The display device of claim 16, wherein the ratio Br/Ar is about 1.62, the ratio Bg/Ag is about 1.77, and the ratio Bb/Ab is about 1.55.