# US 2017/0256752 A1 · Display panel and manufacturing method of the same

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- Number: US 2017/0256752 A1
- Document ID: US20170256752A1
- Status: Published application
- Kind: A1
- Application number: 15/505,481
- Filed: 2015-08-18
- Published: 2017-09-07
- Earliest claimed: 2014-08-29
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Moon Bae GEE; Han Sun PARK; Su Hyeon KIM
- Web page: https://patentgrep.com/patent/US20170256752A1

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K 59/8793: {Arrangements for polarized light emission (H10K59/8791 takes precedence)}
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Disclosed herein is a display panel including a polarizing emission layer. An organic light emitting device is formed on a first substrate. A polarizing emission layer are formed on a second substrate facing the first substrate. The polarizing emission layer is formed in a subpixel area corresponding to the organic light emitting device. The polarizing emission layer includes quantum rods. The quantum rods are aligned in one direction to be polarized. Accordingly, loss of transmitting light in the display panel including the polarizing layer may be minimized. In addition, since colors are implemented by the quantum rods included in the polarizing emission layer, color filters can be replaced by the quantum rods, and loss of light resulting from the color filters may be minimized.

## Claims

### Claim 1

A display panel comprising:
a first substrate having a plurality of subpixel areas defined to constitute one unit pixel;
a second substrate facing the first substrate;
an organic light emitting device corresponding to the subpixel areas on the first substrate; and
a polarizing emission layer on the organic light emitting device, and corresponding to at least one of the subpixel areas.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein the organic light emitting device comprises a driving device, a pixel electrode, an organic emission layer and a common electrode.

### Claim 3 (depends on 2)

The display panel according to claim 2, wherein the organic emission layer is a blue organic emission layer.

### Claim 4 (depends on 2)

The display panel according to claim 2, wherein the organic emission layer is an ultraviolet (UV) organic emission layer capable of emitting light of a UV wavelength.

### Claim 5 (depends on 2)

The display panel according to claim 2, wherein the common electrode is a transparent electrode.

### Claim 6 (depends on 1)

The display panel according to claim 1, further comprising a plurality of dummy electrodes within the polarizing emission layer, wherein the dummy electrodes are transparent electrodes.

### Claim 7 (depends on 6)

The display panel according to claim 6, wherein the dummy electrodes are disposed to correspond to the polarizing emission layer.

### Claim 8 (depends on 1)

The display panel according to claim 1, wherein the polarizing emission layer comprises quantum rods.

### Claim 9 (depends on 8)

The display panel according to claim 8, wherein the quantum rods are selected from red quantum rods, blue quantum rods and green quantum rods.

### Claim 10 (depends on 1)

The display panel according to claim 1, further comprising a polarizing layer on the second substrate.

### Claim 11 (depends on 10)

The display panel according to claim 10, wherein a polarization direction of the polarizing emission layer coincides with a polarization direction of the polarizing layer.

### Claim 12

A method for manufacturing a display panel, the method comprising:
forming an organic light emitting device on a first substrate;
forming a plurality of dummy electrodes on a second substrate; and
forming a polarizing emission layer on the second substrate,
wherein the forming the polarizing emission layer on the second substrate comprises:
applying current to the dummy electrodes to secure polarization of the polarizing emission layer; and
attaching the first substrate to the second substrate.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the forming the dummy electrodes comprises performing dry etching using a mask.

### Claim 14 (depends on 12)

The method according to claim 12, wherein the forming the dummy electrodes comprises patterning the dummy electrodes to have a comb pattern.

### Claim 15 (depends on 12)

The method according to claim 12, wherein the forming the polarizing emission layer comprises applying quantum rods mixed with a volatile solvent.