# US 12,193,298 B2 · Organic light emitting display apparatus

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- Number: US 12,193,298 B2
- Document ID: US12193298B2
- Status: Granted
- Kind: B2
- Application number: 17/548,198
- Filed: 2021-12-10
- Published: 2022-06-16
- Granted: 2025-01-07
- Earliest claimed: 2020-12-11
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: HyeonHoon Shin; Heejae Park; Taehoon Lee
- Web page: https://patentgrep.com/patent/US12193298B2

## CPC

- H10K 59/352: {the areas of the RGB subpixels being different}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers}
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- H10K 2102/3026: {Top emission}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light emitting display apparatus includes an organic light emitting device provided in each of a plurality of subpixels, and a color shift prevention structure on the organic light emitting device.

## Claims

### Claim 1

An organic light emitting display apparatus comprising:
a display panel including a plurality of subpixels;
an organic light emitting device provided in each of the plurality of subpixels; and
a color shift prevention structure on the organic light emitting device,
wherein the color shift prevention structure includes a first capping layer on the organic light emitting device and second capping layers on the first capping layer, and
wherein the second capping layers are differently provided for each of the plurality of subpixels.

### Claim 2 (depends on 1)

The organic light emitting display apparatus of claim 1 wherein the first capping layer is an organic film, and the second capping layers are an inorganic film.

### Claim 3 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein the first capping layer contacts an upper portion of a cathode of the organic light emitting device.

### Claim 4 (depends on 3)

The organic light emitting display apparatus of claim 3, wherein the first capping layer directly covers the upper portion of the cathode of the organic light emitting device.

### Claim 5 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein the second capping layers have a same shape as a shape of an anode of the organic light emitting device.

### Claim 6 (depends on 5)

The organic light emitting display apparatus of claim 5, wherein an area of the second capping layer is approximately 50% to 90% of an area of the anode of the organic light emitting device.

### Claim 7 (depends on 5)

The organic light emitting display apparatus of claim 5, wherein an area of a second capping layers corresponding to a subpixel for emitting blue light is wider than an area of a second capping layers corresponding to a subpixel for emitting green light, and
the area of the second capping layer corresponding to the subpixel for emitting the green light is wider than an area of a second capping layer corresponding to a subpixel for emitting red light.

### Claim 8 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein one of the second capping layers has an area which is enlarged as a wavelength of light emitted from a corresponding subpixel is shortened.

### Claim 9 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein the second capping layers are semispherical.

### Claim 10 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein an interface between the first capping layer and the second capping layers has a roughness.

### Claim 11 (depends on 1)

The organic light emitting display apparatus of claim 1, wherein the organic light emitting apparatus includes a first region including at least one of the plurality of subpixels, where the second capping layers are disposed at an upper portion thereof, at a first ratio, and a second region including at least one of the plurality of subpixels, where the second capping layers are disposed at an upper portion thereof, at a second ratio, and
wherein the second ratio is different from the first ratio.

### Claim 12 (depends on 11)

The organic light emitting display apparatus of claim 11, wherein the second ratio is greater than the first ratio.

### Claim 13 (depends on 11)

The organic light emitting display apparatus of claim 11, wherein a second viewing angle, at which a user looks at the second region, is greater than a first viewing angle at which the user looks at the first region.