Organic el display device

Patent metadata

Field	Value
Publication number	US-2024085784-A1
Application number	US-202318475169-A
Country	US
Kind code	A1
Filing date	Sep 26, 2023
Priority date	Apr 22, 2021
Publication date	Mar 14, 2024
Grant date	—

Abstract

Provided is an organic EL display device that exhibits high luminance and high color reproducibility and has a color filter which exhibits excellent pixel adhesion and excellent pixel linearity in a development step even in a case of high colorant concentration. This organic EL display device comprises an organic EL layer and a color filter on a silicon substrate in which a driving element is formed. The color filter has pixels including specific red, green, and blue pixels. Each of the pixels is a cured product of a photosensitive coloring composition which contains a specific colorant (A), a photopolymerizable monomer (B), a photopolymerization initiator (C), and a resin (D). The photopolymerizable monomer (B) includes a compound represented by formula (1), and the photopolymerization initiator (C) includes an oxime ester photopolymerization initiator. Formula (1): [CH 2 ═CHC(═O)—(OC m H 2m ) n —OCH 2 ] 3 —CCH 2 CH 3 (Signs in formula (1) are according to those described in the description.)

First claim

1 . An organic EL display device, comprising an organic EL layer and a color filter on a silicon substrate on which a driving element is formed,
wherein the color filter has pixels including red pixels, green pixels, and blue pixels, wherein, when the film thickness of the pixel is 1.5 μm, for a spectral transmittance of the red pixel, a maximum transmittance of light in a wavelength range of 450 nm to 560 nm is 0.5% or less, a 50% half-value wavelength is 593 nm to 603 nm, and a maximum transmittance of light in a wavelength range of 600 nm to 700 nm is 80% or more and less than 100%, for the spectral transmittance of the green pixel, a maximum transmittance of light in a wavelength range of 400 nm to 470 nm is 2% or less, a maximum transmittance of light at a wavelength of 525 to 535 nm is 67% or more, a 50% half-value wavelength on the short wavelength side is 497 to 507 nm, and a 50% half-value wavelength on the long wavelength side is 554 to 581 nm, and for the spectral transmittance of the blue pixel, a maximum transmittance of light in a wavelength range of 500 nm to 560 nm is less than 20%, wherein the pixel is a cured product of a photosensitive coloring composition containing a colorant (A), a photopolymerizable monomer (B), a photopolymerization initiator (C) and a resin (D), wherein, in the red pixel, the colorant (A) contains Pigment Red 177 and other colorants, wherein, in the green pixel, the colorant (A) contains Pigment Yellow 185, and one or more selected from the group consisting of Pigment Green 36, Pigment Green 62, Pigment Green 63 and Pigment Green 59, and optionally contains other colorants, and a content of Pigment Yellow 185 in the colorant (A) of the green pixel is 49 weight % to 59 weight %, wherein the blue pixel contains Pigment Blue 15:6 and other colorants, wherein, in the red pixel, the other colorants include one or more selected from the group consisting of Pigment Red 254 and Pigment Yellow 139, wherein, in the green pixel, the other colorants include Pigment Blue 15:3, wherein, in the blue pixel, the other colorants include one or more selected from the group consisting of Pigment Violet 23 and a xanthene dye, wherein the photopolymerizable monomer (B) contains a compound represented by the following General Formula (1), and wherein the photopolymerization initiator (C) contains an oxime ester photopolymerization initiator:
[CH 2 ═CHC(═O)—(OC m H 2m ) n —OCH 2 ] 3 —CR  General Formula (1)

(in General Formula (1), m represents an integer of 1 to 3, n represents an integer of 0 to 2, and a plurality of m and n may be the same as or different from each other, and
R represents a substituent selected from among —CH 2 CH 3 , —CH 2 OH, and —CH 2 O(C═O)C═CH 2 ).

2 . The organic EL display device according to claim 1 ,
wherein a cured product constituting the red pixel contains a colorant (A-1) Pigment Red 177, a colorant (A-2) Pigment Red 254, and a colorant (A-3) Pigment Yellow 139, wherein, in the colorant (A) in the red pixel, a content of the colorant (A-1) is 55 weight % to 65 weight %, a content of the colorant (A-2) is 15 weight % to 25 weight %, and a content of the colorant (A-3) is 15 weight % to 25 weight %, wherein a cured product constituting the green pixel contains a colorant (A-4) Pigment Yellow 185, a colorant (A-5) Pigment Green 36, a colorant (A-6) Pigment Green 62, a colorant (A-11) Pigment Green 63, a colorant (A-12) Pigment Green 59, and a colorant (A-7) Pigment Blue 15:3 according to the following combinations (I) to (IV): (I) the colorant (A-4), the colorant (A-5) and the colorant (A-7) (II) the colorant (A-4) and the colorant (A-6) (III) the colorant (A-4) and the colorant (A-11) (IV) the colorant (A-4) and the colorant (A-12), wherein, in the colorant (A) in the green pixel, a content of the colorant (A-4) is 49 weight % to 59 weight %, a content of the colorant (A-5), the colorant (A-6), the colorant (A-11) or the colorant (A-12) is 33 weight % to 51 weight %, and a content of the colorant (A-7) is 0 weight % to 13 weight %, wherein a cured product constituting the blue pixel contains a colorant (A-8) Pigment Blue 15:6, a colorant (A-9) Pigment Violet 23, and a colorant (A-10) xanthene dye, and wherein, in the colorant (A) in the blue pixel a content of the colorant (A-8) is 58 weight % to 64 weight %, a content of the colorant (A-9) is 12 weight % to 20 weight %, and a content of the colorant (A-10) is 17 weight % to 25 weight %.

3 . The organic EL display device according to claim 1 ,
wherein a content of the compound represented by General Formula (1) with respect to a total amount of the photopolymerizable monomer (B) is 50 weight % or more.

4 . The organic EL display device according to claim 1 ,
wherein the oxime ester photopolymerization initiator is a compound represented by the following General Formula (2):

(in General Formula (2), Z represents a direct bond or a —C(═O)— group, R 1 represents an alkyl group which optionally has a substituent and has 1 to 20 carbon atoms, R 2 represents an alkyl group which optionally has a substituent and has 1 to 20 carbon atoms or an aryl group which optionally has a substituent, R 3 to R 10 each independently represent a hydrogen atom, an alkyl group which optionally has a substituent and has 1 to 20 carbon atoms, an aryl group which optionally has a substituent, a nitro group, or an R 11 —C(═O)— group, and R 11 represents an aryl group which optionally has a substituent).

5 . The organic EL display device according to claim 1 ,
wherein the oxime ester photopolymerization initiator is a compound represented by the following General Formula (3):

(in General Formula (3), W 1 and W 2 each independently represent a carbonyl bond (—CO—) or a single bond, and at least one of W 1 and W 2 is a carbonyl bond (—CO—), and
R a is an alkyl group having 2 to 6 carbon atoms, R b is an alkyl group having 4 to 10 carbon atoms, R c is a group which contains at least a hydrocarbon ring or a heterocycle and may additionally contain at least one divalent linking group selected from among an alkylene chain having 1 to 4 carbon atoms, a thioether bond (—S—), an ether bond (—O—), and a carbonyl bond (—CO—), R b and R c are substituents different from each other, and R d and R e are each independently an alkyl group having 1 to 6 carbon atoms).

6 . The organic EL display device according to claim 1 ,
wherein the resin (D) includes a photosensitive resin.

7 . The organic EL display device according to claim 6 ,
wherein the photosensitive resin contains a vinyl polymer having an aromatic carboxylic acid at terminal of the photosensitive resin.

8 . The organic EL display device according to claim 1 ,
wherein the photosensitive coloring composition further contains a solvent, and the solvent includes an ether ester solvent and an ether alcohol solvent.

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyo Visual Solutions Co Ltd
• Toppan Inc

Inventors

• KOGURE Taketo
• Hiki Kenji
• Nishida Kazufumi
• Tsunekawa Shinji
• Yamauchi Atsushi
• NAGATOME Hiroki

Classifications

• H10K59/00

  Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 · CPC title

• G03F7/0007 Primary

  Filters, e.g. additive colour filters; Components for display devices · CPC title

• G03F7/031 Primary

  Organic compounds not covered by group G03F7/029 · CPC title

• G03F7/0048

  characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title