Optical laminate and image display device

Patent metadata

Field	Value
Publication number	US-12552992-B2
Application number	US-202318184342-A
Country	US
Kind code	B2
Filing date	Mar 15, 2023
Priority date	Mar 22, 2022
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

Provided is an optical laminate that has excellent uniformity and is capable of suppressing a change in tint of reflected light during black display in a case where the optical laminate is used for an image display device, and an image display device formed of the optical laminate. The optical laminate includes a light absorption anisotropic layer containing a dichroic substance, a photo-alignment film, and a base material in order, in which the photo-alignment film contains a specific compound having a refractive index of 1.55 to 1.70, and the base material has a glass transition temperature of 150° C. or higher.

First claim

What is claimed is:

1 . An optical laminate comprising:
a light absorption anisotropic layer containing a dichroic substance; a photo-alignment film; and a base material in order, wherein the photo-alignment film contains a specific compound having a refractive index of 1.55 to 1.70, wherein the base material has a glass transition temperature of 150° C. or higher, and wherein the specific compound is a compound represented by any of Formulae (1) to (3),
B-(G-A) n -G-B  (1)

in Formula (1), n represents an integer of 0 or greater, B represents an acyl group having at least one aromatic ring, where a plurality of B's may be the same as or different from each other, G represents an alkylene glycol residue, an aryl glycol residue, or an oxyalkylene glycol residue, where in a case where n represents an integer of 1 or greater, a plurality of G's may be the same as or different from each other, and A represents an alkylene dicarboxylic acid residue or an aryl dicarboxylic acid residue, where in a case where n represents an integer of 2 or greater, a plurality of A's may be the same as or different from each other,

in Formula (2),
R 1 , R 2 , R 3 , R 4 , and R 5 each independently represent a hydrogen atom, a halogen atom, a nitro group, a hydroxy group, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an aryl group which may have a substituent, an alkoxy group which may have a substituent, an acyloxy group which may have a substituent, an aryloxy group which may have a substituent, an alkylthio group which may have a substituent, an arylthio group which may have a substituent, a mono- or dialkylamino group which may have a substituent, an acylamino group which may have a substituent, or a 5- to 6-membered heterocyclic group, where R 4 and R 5 may be bonded to each other to form a 5- to 6-membered carbon ring,

in Formula (3),
R 6 , R 7 , R 8 , and R 9 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkoxy group which may have a substituent, a phenyl group which may have a substituent, a cycloalkyl group which may have a substituent, an alkylcarbonyl group which may have a substituent, an alkylsulfonyl group which may have a substituent, or a —CO(NH) m-1 -D group, D represents an alkyl group which may have a substituent, an alkenyl group which may have a substituent, or a phenyl group which may have a substituent, and m represents 1 or 2.

2 . The optical laminate according to claim 1 ,
wherein B in Formula (1) represents a group represented by Formula (4),

in Formula (4),
“*” represents a bonding position, and
R 10 represents a hydrogen atom, an alkyl group which may have a substituent, a carboxy group, or a hydroxy group.

3 . The optical laminate according to claim 1 ,
wherein A in Formula (1) represents a dicarboxylic acid residue represented by Formula (5),

in Formula (5),
“*” represents a bonding position, and
R 11 represents a hydrogen atom, an alkyl group which may have a substituent, a carboxy group, or a hydroxy group.

4 . The optical laminate according to claim 2 ,
wherein A in Formula (1) represents a dicarboxylic acid residue represented by Formula (5),

in Formula (5),
“*” represents a bonding position, and
R 11 represents a hydrogen atom, an alkyl group which may have a substituent, a carboxy group, or a hydroxy group.

5 . The optical laminate according to claim 1 ,
wherein a content of the specific compound contained in the photo-alignment film is in a range of 0.1 to 150 mg/cm 3 .

6 . An optical laminate comprising:
a light absorption anisotropic layer containing a dichroic substance; a photo-alignment film; and a base material in order, wherein the photo-alignment film contains a specific compound having a refractive index of 1.55 to 1.70, wherein the base material has a glass transition temperature of 150° C. or higher, and wherein the base material consists of a cellulose acylate-based film that satisfies at least one of Condition 1 or Condition 2, Condition 1: the cellulose acylate-based film contains 1% to 20% by mass of a compound represented by Formula (1) Condition 2: the cellulose acylate-based film contains 0.1% to 10% by mass of a compound represented by Formula (2) or (3)
B-(G-A) n -G-B  (1)

in Formula (1), n represents an integer of 0 or greater, B represents an acyl group having at least one aromatic ring, where a plurality of B's may be the same as or different from each other, G represents an alkylene glycol residue, an aryl glycol residue, or an oxyalkylene glycol residue, where in a case where n represents an integer of 1 or greater, a plurality of G's may be the same as or different from each other, and A represents an alkylene dicarboxylic acid residue or an aryl dicarboxylic acid residue, where in a case where n represents an integer of 2 or greater, a plurality of A's may be the same as or different from each other,

in Formula (2),
R 1 , R 2 , R 3 , R 4 , and R 5 each independently represent a hydrogen atom, a halogen atom, a nitro group, a hydroxy group, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an aryl group which may have a substituent, an alkoxy group which may have a substituent, an acyloxy group which may have a substituent, an aryloxy group which may have a substituent, an alkylthio group which may have a substituent, an arylthio group which may have a substituent, a mono-or dialkylamino group which may have a substituent, an acylamino group which may have a substituent, or a 5- to 6-membered heterocyclic group, where R 4 and R 5 may be bonded to each other to form a 5- to 6-membered carbon ring,

in Formula (3),
R 6 , R 7 , R 8 , and R 9 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkoxy group which may have a substituent, a phenyl group which may have a substituent, a cycloalkyl group which may have a substituent, an alkylcarbonyl group which may have a substituent, an alkylsulfonyl group which may have a substituent, or a —CO(NH) m-1 -D group, D represents an alkyl group which may have a substituent, an alkenyl group which may have a substituent, or a phenyl group which may have a substituent, and m represents 1 or 2.

7 . The optical laminate according to claim 6 ,
wherein a distribution of a content of at least one of a sodium ion or a potassium ion contained in the base material in a thickness direction is a distribution in which a content in a surface layer portion corresponding to 1% of a thickness from a surface of the base material on a side of the photo-alignment film is three or more times a content in a central portion of the base material in the t

Assignees

• Fujifilm Corp

Inventors

• Maeda Yoshinori

Classifications

• G02F1/133528

  Polarisers · CPC title

• G02F2413/01

  Number of plates being 1 · CPC title

• G02F2202/08

  glass transition temperature · CPC title

• G02F1/133638

  Waveplates, i.e. plates with a retardation value of lambda/n · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title