# US 9,040,979 B2 · Organic electroluminescent display device

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- Number: US 9,040,979 B2
- Document ID: US9040979B2
- Status: Granted
- Kind: B2
- Application number: 14/519,964
- Filed: 2014-10-21
- Published: 2015-03-12
- Granted: 2015-05-26
- Earliest claimed: 2011-10-27
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Woo Chan Kim; Byung Chul Ahn; Hong Ki Park; Hyo Dae Bae; Yoon Heung Tak; Sung Goo Jung
- Web page: https://patentgrep.com/patent/US9040979B2

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/127: comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/80521: {characterised by their shape}
- H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers}
- H10K 71/50: Forming devices by joining two substrates together, e.g. lamination techniques
- H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic electroluminescent display device is disclosed which includes a lower substrate including a first substrate defined into red, green and blue sub-pixel regions, first and second switching elements formed in the red and green sub-pixel regions, first and second anodes each connected to the first and second switching elements, and a first organic light emission layer entirely formed on the first substrate provided with the first and second anodes; and an upper substrate including a second substrate, red and green color filter layers formed on the second substrate corresponding to the red and green sub-pixel regions, a third switching element formed on the second substrate corresponding to the blue sub-pixel region, a third anode connected to the third switching element, and a second organic light emission layer entirely formed on the second substrate provided with the red and green color filter layers and the third anode.

## Claims

### Claim 1

An organic electroluminescent display device comprising:
first through third switching elements formed in red, green and blue sub-pixel regions into which a substrate is defined, respectively;
a passivation layer entirely formed on the substrate which is provided with the first through third switching elements;
red and green color filter layers formed on the passivation layer corresponding to the red and green sub-pixel regions;
first through third anodes formed in the red, green and blue sub-pixel regions, respectively;
an organic light emission layer pattern formed on the substrate which is provided with the first through third anodes;
a first cathode formed on the organic light emission layer pattern;
an organic light emission layer formed on the substrate which is provided with the first cathode; and
a second cathode formed on the organic light emission layer.

### Claim 2 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the first and second anodes are formed on the red and green color filter layers, respectively.

### Claim 3 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the third anode is formed on the passivation layer corresponding to the blue sub-pixel region.

### Claim 4 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the first through third anodes are formed from a transparent conductive material such as one of indium-tin-oxide ITO, indium-zinc-oxide IZO and aluminum-zinc-oxide AZO.

### Claim 5 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the first and second cathodes are formed from one of magnesium Mg, calcium Ca, aluminum Al, silver Ag, lithium Li and alloys thereof.

### Claim 6 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the organic light emission layer pattern is formed on only the red and green color filters.

### Claim 7 (depends on 6)

The organic electroluminescent display device of claim 6, wherein the first cathode is formed on only the organic light emission layer pattern.

### Claim 8 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the organic light emission layer pattern is formed from an organic material adapted to generate a mixture of red light and green light.

### Claim 9 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the organic light emission layer is formed from an organic material adapted to generate blue light.

### Claim 10 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the organic light emission layer is formed on the third anode within the blue sub-pixel region.

### Claim 11 (depends on 1)

The organic electroluminescent display device of claim 1, wherein the organic light emission layer pattern and the organic light emission layer are formed on the first through third anodes in the same layer.