Light absorption anisotropic film, laminate, and image display device

Patent metadata

Field	Value
Publication number	US-11960182-B2
Application number	US-202218060873-A
Country	US
Kind code	B2
Filing date	Dec 1, 2022
Priority date	Jun 5, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Provided is a light absorption anisotropic film capable of preparing an image display device having excellent display performance and excellent durability, and a laminate and an image display device formed of the light absorption anisotropic film. The light absorption anisotropic film is used for an image display device, which is formed of a liquid crystal composition containing a liquid crystal compound and a dichroic substance, in which in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1) 2.0≤Imax/Isur1.

First claim

What is claimed is:

1. A light absorption anisotropic film used for an image display device, which is formed of a liquid crystal composition containing a liquid crystal compound and a dichroic substance,
wherein in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1),
2.0≤Imax/Isur1  (I-1).

2. A light absorption anisotropic film used for an image display device, which is formed of a liquid crystal composition containing a liquid crystal compound and a dichroic substance,
wherein in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1), and
wherein a thickness between the surface of the light absorption anisotropic film on the viewing side of the image display device and a position where the maximum intensity Imax is exhibited is greater than 50 nm,
2.0≤Imax/Isur1  (I-1).

3. The light absorption anisotropic film according to claim 1 ,
wherein a thickness between the surface of the light absorption anisotropic film on the viewing side of the image display device and a position where the maximum intensity Imax is exhibited is greater than 60 nm.

4. A light absorption anisotropic film used for an image display device, which is formed of a liquid crystal composition containing a liquid crystal compound and a dichroic substance,
wherein in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1), and
wherein the liquid crystal composition further contains a surfactant, and
a difference between a log P value of the surfactant and a log P value of the liquid crystal compound is less than 3.1,
2.0≤Imax/Isur1  (I-1).

5. The light absorption anisotropic film according to claim 1 ,
wherein the liquid crystal composition further contains a surfactant, and
a difference between a log P value of the surfactant and a log P value of the liquid crystal compound is less than 1.4.

6. The light absorption anisotropic film according to claim 1 ,
wherein the liquid crystal composition further contains a surfactant, where a difference in a log P value between the surfactant and the liquid crystal compound is less than 1.4 and a surfactant, where a difference in a log P value between the surfactant and the liquid crystal compound is greater than or equal to 1.4.

7. A laminate used for an image display device, comprising in order:
a base material;
an alignment film; and
a light absorption anisotropic film,
wherein the light absorption anisotropic film is the light absorption anisotropic film according to claim 1 , and
in a signal derived from the dichroic substance detected by time-of-flight secondary ion mass spectrometry, a relationship between a maximum intensity Imax of the light absorption anisotropic film in a thickness direction and an intensity Isur1 in a surface of the light absorption anisotropic film on a viewing side of the image display device satisfies Expression (I-1),
2.0≤Imax/Isur1  (I-1).

8. The laminate according to claim 7 , further comprising:
a retardation plate provided on the light absorption anisotropic film,
wherein the retardation plate includes a plurality of optically anisotropic layers containing a liquid crystal compound, and
at least one of the plurality of optically anisotropic layers is an optically anisotropic layer containing a twistedly aligned liquid crystal compound having a helix axis in the thickness direction.

9. The laminate according to claim 7 , further comprising:
a surface protective material provided on the light absorption anisotropic film,
wherein the base material is a glass base material having a thickness of 100 μm or less.

10. The laminate according to claim 7 , further comprising:
a λ/4 plate provided on the light absorption anisotropic film.

11. An image display device comprising:
the light absorption anisotropic film according to claim 1 .

12. An image display device comprising:
the laminate according to claim 7 .

13. The light absorption anisotropic film according to claim 2 ,
wherein the liquid crystal composition further contains a surfactant, and
a difference between a log P value of the surfactant and a log P value of the liquid crystal compound is less than 3.1.

14. The light absorption anisotropic film according to claim 2 ,
wherein the liquid crystal composition further contains a surfactant, and
a difference between a log P value of the surfactant and a log P value of the liquid crystal compound is less than 1.4.

15. The light absorption anisotropic film according to claim 2 ,
wherein the liquid crystal composition further contains a surfactant, where a difference in a log P value between the surfactant and the liquid crystal compound is less than 1.4 and a surfactant, where a difference in a log P value between the surfactant and the liquid crystal compound is greater than or equal to 1.4.

16. A laminate used for an image display device, comprising in order:
a base material;
an alignment film; and
a light absorption anisotropic film,
wherein the light absorption anisotropic film is the light absorption anisotropic film according to claim 2 .

17. The laminate according to claim 16 , further comprising:
a retardation plate provided on the light absorption anisotropic film,
wherein the retardation plate includes a plurality of optically anisotropic layers containing a liquid crystal compound, and
at least one of the plurality of optically anisotropic layers is an optically anisotropic layer containing a twistedly aligned liquid crystal compound having a helix axis in the thickness direction.

18. The laminate according to claim 16 , further comprising:
a surface protective material provided on the light absorption anisotropic film,
wherein the base material is a glass base material having a thickness of 100 μm or less.

19. The laminate according to claim 16 , further comprising:
a λ/4 plate provided on the light absorption anisotropic film.

20. An image display device comprising:
the light absorption anisotropic film according to claim 2 .

Assignees

• Fujifilm Corp

Inventors

• Kato Yumi
• Koito Naoki
• Matsuyama Hiroshi
• Sugita Akihiro
• Kasahara Takehiro
• Yamada Naoyoshi

Classifications

• H10K59/8791

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

• G02F1/1351 Primary

  Light-absorbing or blocking layers · CPC title

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02F1/133354

  Arrangements for aligning or assembling substrates · CPC title

• G02F1/133509

  Filters, e.g. light shielding masks · CPC title