Organic light emitting display apparatus

• US 10,644,266 B2
• Filed: 11/27/2017
• Issued: 05/05/2020
• Est. Priority Date: 09/01/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Yang, Jungjin, Song, Wonjun, Lee, Kwanhee
• Primary Examiner(s): Lu, Farun
• Application Number:
  US15/823,470
• Publication Number:
  US 20180083228A1
• Time in Patent Office: 890 Days
• CPC Class Codes: G02B 5/02 Diffusing elements; Afocal elements
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements

Abstract

An organic light emitting display apparatus includes a substrate, a plurality of organic light emitting elements on the substrate, an encapsulation substrate covering the organic light emitting elements, and a scattering layer including a resin, and a plurality of scattering particles distributed in the resin, and including a variety of particle sizes in a first range from about 500 nm to about 800 nm, wherein ones of the scattering particles having a first particle size include a highest concentration of the scattering particles, and wherein a concentration of other ones of the scattering particles is inversely proportional to a magnitude of a difference in particle size between the other ones of the scattering particles and the ones of the scattering particles having the first particle size.

Claims

1. An organic light emitting display apparatus comprising:

a substrate;

a plurality of organic light emitting elements on the substrate;

an encapsulation layer covering the organic light emitting elements; and

a scattering layer on the encapsulation layer, and separated from the plurality of organic light emitting elements, the scattering layer comprising;

a resin; and

a plurality of scattering particles distributed in the resin, and comprising a variety of particle sizes,

wherein concentrations of respective groups of similarly sized ones of the scattering particles satisfy a normal distribution,

wherein ones of the scattering particles having a first particle size comprise a highest concentration of the scattering particles, and

wherein a concentration of other ones of the scattering particles is inversely proportional to a magnitude of a difference in particle size between the other ones of the scattering particles and the ones of the scattering particles having the first particle size.

2. The organic light emitting display apparatus of claim 1, wherein the scattering layer faces the substrate such that the encapsulation layer is between the scattering layer and the substrate.

3. The organic light emitting display apparatus of claim 1, further comprising

a polarizing film on the scattering layer.

4. The organic light emitting display apparatus of claim 3, wherein the resin comprises a transparent adhesive material, and

wherein the scattering layer is attached to the polarizing film.

5. The organic light emitting display apparatus of claim 3, wherein the scattering layer has a thickness of about 50 micrometers or less.

6. The organic light emitting display apparatus of claim 3, wherein a concentration of the scattering particles with respect to the scattering layer is about 50% or less.

7. The organic light emitting display apparatus of claim 3, wherein the scattering particles comprise at least one of Al₂O₃, Zr or SiO₂.

8. The organic light emitting display apparatus of claim 1, wherein the plurality of scattering particles has a variety of particle sizes in a first range from about 500 nm to about 800 nm.

9. The organic light emitting display apparatus of claim 8, wherein the first particle size is about 650 nm, and

wherein a full-width half-maximum corresponding to a graph of concentration percentages of the scattering particles grouped by particle size as a function of the particle size is in a range from about 145 nm to about 155 nm.

10. The organic light emitting display apparatus of claim 8, wherein the scattering particles have a variety of particle sizes in a second range from about 560 nm to about 740 nm,

wherein the first particle size is about 650 nm, and

wherein a full-width half-maximum corresponding to a graph of concentration percentages of the scattering particles grouped by particle size as a function of the particle size is in a range from about 70 nm to about 80 nm.

11. The organic light emitting display apparatus of claim 8, wherein the scattering particles have a variety of particle sizes in a third range from about 605 nm to about 695 nm,

wherein the first particle size is about 650 nm, and

wherein a full-width half-maximum corresponding to a graph of concentration percentages of the scattering particles grouped by particle size as a function of the particle size is in a range from about 25 nm to about 35 nm.

12. The organic light emitting display apparatus of claim 8, wherein the scattering particles have a variety of particle sizes in a fourth range from about 515 nm to about 665 nm,

wherein the first particle size is about 590 nm, and

wherein a full-width half-maximum corresponding to a graph of concentration percentages of the scattering particles grouped by particle size as a function of the particle size is in a range from about 45 nm to about 55 nm.

13. An organic light emitting display apparatus comprising:

a substrate;

a plurality of organic light emitting elements on the substrate;

an encapsulation layer covering the organic light emitting elements;

a scattering layer below the encapsulation layer, and separated from the plurality of organic light emitting elements, the scattering layer comprising;

a resin; and

a plurality of scattering particles distributed in the resin, and comprising a variety of particle sizes,

wherein the scattering layer faces the encapsulation layer such that the substrate is between the scattering layer and the encapsulation layer,

wherein ones of the scattering particles having a first particle size comprise a highest concentration of the scattering particles, and

wherein a concentration of other ones of the scattering particles is inversely proportional to a magnitude of a difference in particle size between the other ones of the scattering particles and the ones of the scattering particles having the first particle size.

14. The organic light emitting display apparatus of claim 13, further comprising a polarizing film below the scattering layer,

wherein the plurality of scattering particles has a variety of particle sizes in a first range from about 500 nm to about 800 nm.

15. An organic light emitting display apparatus comprising:

a substrate;

a plurality of organic light emitting elements on the substrate;

an encapsulation layer covering the organic light emitting elements;

a scattering layer on the encapsulation layer, and separated from the plurality of organic light emitting elements, the scattering layer comprising;

a resin; and

a plurality of scattering particles distributed in the resin; and

a polarizing film on the scattering layer,

wherein the scattering particles have a variety of particle sizes,

wherein ones of the scattering particles having a first particle size comprise a highest concentration of the scattering particles, and

wherein a concentration of other ones of the scattering particles is inversely proportional to a magnitude of a difference in particle size between the other ones of the scattering particles and the ones of the scattering particles having the first particle size.

16. The organic light emitting display apparatus of claim 15, wherein the plurality of scattering particles has a variety of particle sizes in a first range from about 500 nm to about 800 nm, and

wherein the scattering layer has a thickness of about 50 micrometers or less.

17. The organic light emitting display apparatus of claim 15, wherein concentrations of respective ones of the scattering particles grouped according to a particle size satisfy a normal distribution.

18. The organic light emitting display apparatus of claim 15, wherein a concentration of the scattering particles with respect to the scattering layer is about 50% or less.