# US 2014/0191215 A1 · Organic el display device

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- Number: US 2014/0191215 A1
- Document ID: US20140191215A1
- Status: Published application
- Kind: A1
- Application number: 14/146,783
- Filed: 2014-01-03
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Toshio TOJO
- Web page: https://patentgrep.com/patent/US20140191215A1

## CPC

- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/8792: {comprising light absorbing layers, e.g. black layers}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic EL display device ensures brightness and improves a contrast ratio by a reduction in external light reflection. The organic EL display device includes a wavelength selective absorption filter that absorbs a light in a given absorption spectrum uniform in a display region. An absorption spectrum has a negative correlation with an outgoing spectrum in which respective spectrums of R pixels, G pixels, and B pixels are synthesized together.

## Claims

### Claim 1

An organic EL display device in which pixels of plural colors are arranged in a display region, each of the pixels having a light emitting unit of organic electroluminescence and emitting light from the light emitting unit, the light having a spectrum and a wavelength band which correspond to one of the plural colors, the wavelength band being different from a wavelength band corresponding to another of the plural colors,
the organic EL display device comprising:
an absorption filter that absorbs a light in a given absorption spectrum uniform in the display region,
wherein the absorption spectrum has a negative correlation with an outgoing spectrum obtained by synthesizing spectrums which are different from each other, and
each of the spectrums corresponds to each of the plural colors.

### Claim 2 (depends on 1)

The organic EL display device according to claim 1,
wherein the each of the spectrums has a peak wavelength at which each of the spectrums is a maximum intensity, the peak wavelength corresponding to the each of the plural colors,
the absorption spectrum has one or more spectral peaks,
one of the spectral peaks is in correspondence with a spectral valley of the spectrums of the light emitting units, and
a position of the one of the spectral peaks is between two of the peak wavelengths which correspond to two of the plural colors and are adjacent each other.

### Claim 3 (depends on 2)

The organic EL display device according to claim 2,
wherein the spectral valley is included in the outgoing spectrum obtained by the synthesizing spectrums.

### Claim 4 (depends on 2)

The organic EL display device according to claim 2,
wherein the spectral peaks causes a reduction in transmittance of light, and
a peak of the reduction corresponds to the spectral valley.

### Claim 5 (depends on 2)

The organic EL display device according to claim 2,
wherein the two of the plural colors are blue and green.

### Claim 6 (depends on 1)

The organic EL display device according to claim 1, further comprising: an anti-reflective film stuck on a surface of the display region through an adhesive layer,
wherein the absorption filter consists of the adhesive layer containing pigments that absorb the light therein.

### Claim 7 (depends on 1)

The organic EL display device according to claim 1, further comprising: a sealing film stacked above the light emitting unit and sealing the light emitting unit,
wherein the sealing film is formed of a silicon nitride film and absorbs a shorter wavelength band than a wavelength band which is absorbed by the absorption filter.

### Claim 8 (depends on 7)

The organic EL display device according to claim 7,
wherein the wavelength band which is absorbed by the absorption filter includes a peak wavelength of blue.

### Claim 9 (depends on 1)

The organic EL display device according to claim 1, further comprising: a sealing film stacked on a light emission layer that generates organic electroluminescence, which is disposed in the light emitting unit, and sealing the light emission layer,
wherein the sealing film is formed of a silicon nitride film and absorbs a shorter wavelength band than a wavelength band which is absorbed by the absorption filter.

### Claim 10 (depends on 9)

The organic EL display device according to claim 9,
wherein the wavelength band which is absorbed by the absorption filter includes a peak wavelength of blue.