# US 10,312,477 B2 · Light emitting structure, display device including a light emitting structure and method of manufacturing a display device including a light emitting structure

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- Number: US 10,312,477 B2
- Document ID: US10312477B2
- Status: Granted
- Kind: B2
- Application number: 15/953,342
- Filed: 2018-04-13
- Published: 2018-08-23
- Granted: 2019-06-04
- Earliest claimed: 2011-06-29
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Sung-Soo Lee; Ok-Keun Song; Se-Il Kim
- Web page: https://patentgrep.com/patent/US10312477B2

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/126: Shielding, e.g. light-blocking means over the TFTs
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 50/13: comprising stacked EL layers within one EL unit
- H10K 50/181: {Electron blocking layers}
- H10K 59/1201: {Manufacture or treatment}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 71/18: using non-liquid printing techniques, e.g. thermal transfer printing from a donor sheet
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A light emitting structure includes a first hole injection layer, a first organic light emitting layer, a charge generation layer, a second hole injection layer, a second organic light emitting layer, an electron transfer layer, and a blocking member. The light emitting structure has first, second, and third sub-pixel regions. The first organic light emitting layer may be on the first hole injection layer. The charge generation layer may be on the first organic light emitting layer. The second hole injection layer may be on the charge generation layer. The second organic light emitting layer may be on the second hole injection layer. The electron transfer layer may be on the second organic light emitting layer. The blocking member may be at at least one of the first to the third sub-pixel regions.

## Claims

### Claim 1

A light emitting structure having a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, comprising:
an optical distance controlling layer at only the first sub-pixel region and the second sub-pixel region;
a first organic light emitting layer on the optical distance controlling layer; and
a second organic light emitting layer on the first organic light emitting layer,
wherein the optical distance controlling layer is completely offset from the third sub-pixel region in a stacking direction of the first organic light emitting layer and the optical distance controlling layer.

### Claim 2 (depends on 1)

The light emitting structure of claim 1, wherein the optical distance controlling layer has different thicknesses in adjacent ones of the sub-pixel regions.

### Claim 3 (depends on 1)

The light emitting structure of claim 1, further comprising:
a hole injection layer between the optical distance controlling layer and the first organic light emitting layer.

### Claim 4 (depends on 3)

The light emitting structure of claim 3, wherein the optical distance controlling layer comprises a material that is the same as that of the hole injection layer.

### Claim 5

A light emitting structure having a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region, comprising:
an optical distance controlling layer at at least one of the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region;
a first organic light emitting layer on the optical distance controlling layer;
a second organic light emitting layer on the first organic light emitting layer; and
a blocking member at only the first sub-pixel region,
wherein the blocking member is completely offset from the second sub-pixel region and the third sub-pixel region in a stacking direction of the first organic light emitting layer and the optical distance controlling layer.

### Claim 6 (depends on 5)

The light emitting structure of claim 5,
wherein the blocking member is between the first organic light emitting layer and the second organic light emitting layer.

### Claim 7 (depends on 5)

The light emitting structure of claim 5, wherein the blocking member is on the second organic light emitting layer.

### Claim 8 (depends on 5)

The light emitting structure of claim 5, wherein the blocking member is between the optical distance controlling layer and the first organic light emitting layer.

### Claim 9 (depends on 1)

The light emitting structure of claim 1, wherein one of the first organic light emitting layer and the second organic light emitting layer is configured to emit a blue light.

### Claim 10

A display device comprising:
a substrate having a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region;
a first electrode on the substrate;
an optical distance controlling layer on the first electrode at only the first sub-pixel region and the second sub-pixel region;
a light emitting structure on the optical distance controlling layer, the light emitting structure comprising a first organic light emitting layer and a second organic light emitting layer on the first organic light emitting layer; and
a second electrode on the light emitting structure,
wherein the optical distance controlling layer is completely offset from the third sub-pixel region in a stacking direction of the first organic light emitting layer and the optical distance controlling layer.

### Claim 11 (depends on 10)

The display device of claim 10, wherein the optical distance controlling layer has different thicknesses in adjacent ones of the sub-pixel regions.

### Claim 12 (depends on 10)

The display device of claim 10, wherein the light emitting structure further comprises a hole injection layer between the optical distance controlling layer and the first organic light emitting layer.

### Claim 13 (depends on 10)

The display device of claim 10, further comprising:
a blocking member between the optical distance controlling layer and the second electrode.

### Claim 14 (depends on 13)

The display device of claim 13, wherein a blocking member is at only the first sub-pixel region.