# US 8,541,935 B2 · Color filter and light-emitting display element

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- Number: US 8,541,935 B2
- Document ID: US8541935B2
- Status: Granted
- Kind: B2
- Application number: 13/378,824
- Filed: 2010-09-06
- Published: 2012-04-26
- Granted: 2013-09-24
- Earliest claimed: 2009-09-14
- Assignees: UDC Ireland Limited
- Applicants: Yosuke Takeuchi; Mitsuyoshi Ichihashi; Shinichi Morishima; Tomoki Tasaka
- Inventors: Yosuke Takeuchi; Mitsuyoshi Ichihashi; Shinichi Morishima; Tomoki Tasaka
- Web page: https://patentgrep.com/patent/US8541935B2

## CPC

- G02B 5/201: {in the form of arrays}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 85/342: {comprising iridium}
- H10K 85/346: {comprising platinum}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A color filter for use in a light-emitting display element which emits at least white light, the color filter including a circularly polarizing layer which includes a polarizing layer, the polarizing layer having an orientation layer and a liquid crystal compound layer, wherein the circularly polarizing layer is formed only in an optical path of the white light.

## Claims

### Claim 1

A color filter for use in a light-emitting display element which emits at least white light, the color filter comprising:
a filter layer comprising a plurality of filter portion including a white filter portion,
a circularly polarizing layer which comprises a polarizing layer, the polarizing layer having an orientation layer and a liquid crystal compound layer,
wherein the circularly polarizing layer is formed only in an optical path of the white light transmitted by the white filter portion.

### Claim 2 (depends on 1)

The color filter according to claim 1, wherein the circularly polarizing layer comprises the polarizing layer and a ¼ wavelength layer.

### Claim 3

A color filter for use in a light-emitting display element which emits at least white light, the color filter comprising:
a selective reflection layer,
a filter layer comprising a plurality of filter portion including a white filter portion, and
a circularly polarizing layer which comprises a polarizing layer,
the polarizing layer having an orientation layer and a liquid crystal compound layer,
wherein the circularly polarizing layer and the selective reflection layer are formed only in an optical path of the white light transmitted by the white filter portion.

### Claim 4 (depends on 3)

The color filter according to claim 3, wherein the selective reflection layer comprises a cholesteric liquid crystal compound.

### Claim 5 (depends on 1)

The color filter according to claim 1, wherein the color filter comprises a support, and the support is a transparent support.

### Claim 6 (depends on 5)

The color filter according to claim 5, wherein the support is the ¼ wavelength layer.

### Claim 7

A light-emitting display element comprising:
a color filter, and a light-emitting layer which emits at least white light,
wherein the color filter is a color filter for use in the light-emitting display element which emits the at least white light, the color filter comprising a circularly polarizing layer which comprises a polarizing layer, and a filter layer comprising a plurality of filter portion including a white filter portion,
the polarizing layer having an orientation layer and a liquid crystal compound layer, and
wherein the circularly polarizing layer is formed only in an optical path of the white light transmitted by the white filter portion.

### Claim 8 (depends on 7)

The light-emitting display element according to claim 7, wherein the light-emitting display element has an optical resonator structure.

### Claim 9 (depends on 7)

The light-emitting display element according to claim 7, wherein the light-emitting layer comprises at least one phosphorescent light-emitting material.