Organic light emitting display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9515290-B2
Application number	US-201313747871-A
Country	US
Kind code	B2
Filing date	Jan 23, 2013
Priority date	Jul 6, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An organic light emitting display device includes a substrate, a thin film transistor on the substrate, an organic light emitting element including a first electrode connected to the thin film transistor, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer, and a pixel definition film disposed on the substrate to expose a part of the first electrode. The pixel definition film includes nanoparticles that change a path of light emitted from the organic light emitting layer.

First claim

What is claimed is:

1. An organic light emitting display device, comprising:
a substrate;
a thin film transistor on the substrate;
an organic light emitting element including a first electrode connected to the thin film transistor, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer; and
a pixel definition film disposed on the substrate to expose a part of the first electrode,
wherein the pixel definition film includes nanoparticles that change a path of light emitted from the organic light emitting layer, and
wherein a distribution of the nanoparticles is set depending on an inclination angle of the pixel definition film, such that:
when the inclination angle of the pixel definition film is equal to or smaller than 35 degrees, the nanoparticles are dispersed on the pixel definition film and neighboring an interface between the pixel definition film and one or more of the first electrode, the organic light emitting layer, or the second electrode, and
when the inclination angle of the pixel definition film is larger than 35 degrees, the nanoparticles are uniformly dispersed within the pixel definition film.

2. The organic light emitting display device of claim 1 , wherein:
the organic light emitting layer and the second electrode are on the pixel definition film, and
the nanoparticles are dispersed on the pixel definition film and neighboring an interface between the pixel definition film and the organic light emitting layer.

3. The organic light emitting display device of claim 1 , wherein functional groups of the nanoparticles are substituted with a molecular structure that lowers surface energy.

4. The organic light emitting display device of claim 3 , wherein the molecular structure is one of a carboxyl group, a sulfide group, a hydroxyl group, and a fluorate group.

5. The organic light emitting display device of claim 1 , wherein the nanoparticles are dispersed onto the pixel definition film in an amount of about 10 to about 50 wt % of a total weight of the pixel definition film.

6. The organic light emitting display device of claim 5 , wherein the nanoparticles are dispersed onto the pixel definition film in the amount of about 20 wt % of the total weight of the pixel definition film.

7. An organic light emitting display device, comprising:
a substrate;
a thin film transistor on the substrate;
an organic light emitting element including a first electrode connected to the thin film transistor, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer;
a projection structure disposed on the substrate to change a path of light emitted from the organic light emitting layer; and
a pixel definition film on the substrate to expose a part of the first electrode and to cover the projection structure, the projection structure changing the path of light to output the path of light from the pixel definition film,
wherein the pixel definition film includes nanoparticles that change the path of light emitted from the organic light emitting layer, and
wherein a distribution of the nanoparticles is set depending on an inclination angle of the pixel definition film, such that:
when the inclination angle of the pixel definition film is equal to or smaller than 35 degrees, the nanoparticles are dispersed on the pixel definition film and neighboring an interface between the pixel definition film and one or more of the first electrode, the organic light emitting layer, or the second electrode, and
when the inclination angle of the pixel definition film is larger than 35 degrees, the nanoparticles are uniformly dispersed within the pixel definition film.

8. The organic light emitting display device of claim 7 , wherein functional groups of the nanoparticles are substituted with a molecular structure that lowers surface energy.

9. The organic light emitting display device of claim 7 , further comprising a planarization film on the thin film transistor to planarize the thin film transistor,
wherein the projection structure is directly on the planarization film.

10. The organic light emitting display device of claim 7 , wherein the projection structure is made of a resin having a similar refractive index to the first electrode.

11. A method of manufacturing an organic light emitting display device, the method comprising:
forming a thin film transistor on a substrate;
forming a first electrode that is connected to the thin film transistor;
exposing a part of the first electrode, and coating, exposing, and developing a pixel definition film that includes nanoparticles;
hardening the pixel definition film; and
forming an organic light emitting layer on the first electrode and forming a second electrode on the organic light emitting layer, wherein:
the first electrode, the organic light emitting layer, and the second electrode constitute an organic light emitting element, and
the nanoparticles change a path of light emitted from the organic light emitting layer,
wherein a distribution of the nanoparticles is set depending on an inclination angle of the pixel definition film, such that:
when the inclination angle of the pixel definition film is equal to or smaller than 35 degrees, the nanoparticles are dispersed on the pixel definition film and neighboring an interface between the pixel definition film and one or more of the first electrode, the organic light emitting layer, or the second electrode, and
when the inclination angle of the pixel definition film is larger than 35 degrees, the nanoparticles are uniformly dispersed within the pixel definition film.

12. The method of manufacturing an organic light emitting display device of claim 11 , wherein the hardening of the pixel definition film includes moving and dispersing the nanoparticles to an interface between the pixel definition film and one or more of the first electrode, the organic light emitting layer, or the second electrode.

13. The method of manufacturing an organic light emitting display device of claim 12 , wherein the molecular structure is one of a carboxyl group, a sulfide group, a hydroxyl group, and a fluorate group.

14. The method of manufacturing an organic light emitting display device of claim 11 , wherein functional groups of the nanoparticles are substituted with a molecular structure that lowers surface energy.

Assignees

• Lim Jae Ik
• Park Won Sang
• Samsung Display Co Ltd

Inventors

• Lim Jae Ik
• Park Won Sang

Classifications

• H10K71/40

  Thermal treatment, e.g. annealing in the presence of a solvent vapour · CPC title

• H10K50/854

  comprising scattering means · CPC title

• H10K59/122 Primary

  Pixel-defining structures or layers, e.g. banks · CPC title

• H01L51/5265

  Electricity · mapped topic

• H01L51/5275

  Electricity · mapped topic