Organic light-emitting display device

• US 10,714,539 B2
• Filed: 01/31/2019
• Issued: 07/14/2020
• 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, Moshen
• Application Number:
  US16/264,312
• Publication Number:
  US 20190165053A1
• Time in Patent Office: 530 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;

an encapsulation layer over the opposite electrode;

a lens layer over the encapsulation layer, the lens layer comprising a plurality of condensing lenses; and

a touch electrode layer disposed between the encapsulation layer and the lens layer,

wherein the lens layer comprises a first lens layer and a second lens layer between the first lens layer and the encapsulation layer, the second lens layer having a refractive index less than the refractive index of the first lens layer, and wherein the second lens layer comprises a concave portion concave in a direction toward the encapsulation layer and a non-concave portion located outside the concave portion, and the first lens layer comprises a filling portion filling the concave portion and a non-filling portion located outside the filling portion,

wherein each of the non-concave portion of the second lens layer and the non-filling portion of the first lens layer overlaps the pixel-defining layer,

wherein each of the non-concave portion of the second lens layer and the non-filling portion of the first lens layer does not overlap the central portion of each of the pixel electrodes exposed by the pixel-defining layer,

wherein the encapsulation layer comprises at least one inorganic encapsulation layer and at least one organic encapsulation layer, wherein the lens layer is directly disposed on the encapsulation layer.

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

to about ⅗

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

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

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

5. 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.

6. 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.

7. The display device of claim 1, wherein each of the plurality of condensing lenses has a circular lower surface.

8. The display device of claim 7, 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; and

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.

9. The display device of claim 8, 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.

10. The display device of claim 1, wherein each of the plurality of condensing lenses has a quadrangular lower surface.

11. The display device of claim 10, 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 1.71 to about 3.36;

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 1.83 to about 3.82; and

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 1.66 to about 3.09.

12. The display device of claim 11, 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.

13. The display device of claim 1, wherein each of the plurality of condensing lenses has a polygonal lower surface.

14. The display device of claim 13, 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 a biggest circle that would fit inside the polygonal 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 a biggest circle that would fit inside the polygonal 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; and

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 a biggest circle that would fit inside the polygonal 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.

15. The display device of claim 14, 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.

16. An organic light-emitting display device comprising:

a plurality of pixel electrodes;

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;

an encapsulation layer over the opposite electrode; and

a lens layer over the opposite electrode, the lens layer comprising a plurality of condensing lenses, wherein the encapsulation layer comprises at least one inorganic encapsulation layer and at least one organic encapsulation layer and the lens layer is directly disposed on the encapsulation layer,

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 encapsulation layer and a non-concave portion located outside the concave portion, and the first lens layer comprises a filling portion filling the concave portion and a non-filling portion located outside the filling portion,

a touch electrode layer between the encapsulation layer and the lens layer;

wherein each of the non-concave portion of the second lens layer and the non-filling portion of the first lens layer overlaps the pixel-defining layer, and

wherein each of the non-concave portion of the second lens layer and the non-filling portion of the first lens layer does not overlap the central portion of each of the pixel electrodes exposed by the pixel-defining layer.

17. The display device of claim 16, wherein each of the plurality of pixel electrodes corresponds to one of at least a first pixel, a second pixel, and a third pixel;

wherein each of the plurality of condensing lenses has 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; and

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.

18. The display device of claim 16, wherein each of the plurality of pixel electrodes corresponds to one of at least a first pixel, a second pixel, and a third pixel;

wherein each of the plurality of condensing lenses has a quadrangular 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 1.71 to about 3.36;

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 1.83 to about 3.82; and

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 1.66 to about 3.09.

19. The display device of claim 16, wherein each of the plurality of pixel electrodes corresponds to one of at least a first pixel, a second pixel, and a third pixel;

wherein each of the plurality of condensing lenses has a polygonal 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 a biggest circle that would fit inside the polygonal 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 a biggest circle that would fit inside the polygonal 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; and

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 a biggest circle that would fit inside the polygonal 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.