Optically anisotropic film comprising an absorption intensity ratio of 1.02 or more, laminate, circularly polarizing plate, and display device

Patent metadata

Field	Value
Publication number	US-11353750-B2
Application number	US-202117400752-A
Country	US
Kind code	B2
Filing date	Aug 12, 2021
Priority date	Feb 27, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Provided is an optically anisotropic film exhibiting reverse wavelength dispersibility with excellent thickness-direction phase differences, a laminate, a circularly polarizing plate, and a display device. The optically anisotropic film of an embodiment of the present invention satisfies the following Requirements 1 to 4. Requirement 1: In a case of irradiation with P-polarized light and S-polarized light, which are linearly polarized light perpendicular to each other, from a direction inclined by 45° from a normal direction of a film surface of the optically anisotropic film, an absorption intensity ratio in a case of irradiation with S-polarized light to an absorption intensity in a case of irradiation with P-polarized light is 1.02 or more in an absorption intensity at a wavelength having a largest absorption in a wavelength range of 700 to 900 nm. Requirement 2: Re(550)<10 nm, Requirement 3: Re(800)<10 nm. Requirement 4: Rth(450)/Rth(550)<1.

First claim

What is claimed is:

1. An optically anisotropic film satisfying the following Requirements 1 to 4:
Requirement 1: in a case of irradiation with P-polarized light and S-polarized light, which are linearly polarized light perpendicular to each other, from a direction inclined by 45° from a normal direction of a film surface of the optically anisotropic film, an absorption intensity ratio in a case of irradiation with S-polarized light to an absorption intensity in a case of irradiation with P-polarized light is 1.02 or more in an absorption intensity at a wavelength having a largest absorption in a wavelength range of 700 to 900 nm,
Requirement 2: Re(550)<10 nm,
Requirement 3: Re(800)<10 nm, and
Requirement 4: Rth(450)/Rth(550)<1,
in the formulae, Rth(450) represents a thickness-direction retardation of the optically anisotropic film at a wavelength of 450 nm, Rth(550) represents a thickness-direction retardation of the optically anisotropic film at a wavelength of 550 nm, and Re(550) represents an in-plane retardation of the optically anisotropic film at a wavelength of 550 nm.

2. The optically anisotropic film according to claim 1 ,
wherein the optically anisotropic film is formed of a composition including a liquid crystal compound or a polymer, and an infrared absorbing coloring agent.

3. The optically anisotropic film according to claim 2 ,
wherein the infrared absorbing coloring agent is a compound represented by Formula (1),

in the formula, R 11 and R 12 each independently represent a hydrogen atom or a substituent, at least one of R 11 or R 12 is an electron-withdrawing group, and R 11 and R 12 may be bonded to each other to form a ring, R 13 's each independently represent a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substitutional boron, or a metal atom, and may be covalently bonded or coordinately bonded with R 11 , and R 14 's each independently represent a group having a mesogenic group.

4. The optically anisotropic film according to claim 1 ,
wherein a liquid crystal compound is included, and
the liquid crystal compound is vertically aligned and thus fixed.

5. A laminate comprising:
the optically anisotropic film according to claim 1 ; and
another optically anisotropic film different from the optically anisotropic film.

6. The laminate according to claim 5 ,
wherein the other optically anisotropic film is a λ/4 plate.

7. A circularly polarizing plate comprising:
the optically anisotropic film according to claim 1 ;
a λ/4 plate; and
a polarizer.

8. A display device comprising:
a display element; and
the optically anisotropic film according to claim 1 , arranged on the display element.

9. The optically anisotropic film according to claim 2 ,
wherein a liquid crystal compound is included, and
the liquid crystal compound is vertically aligned and thus fixed.

10. A laminate comprising:
the optically anisotropic film according to claim 2 ; and
another optically anisotropic film different from the optically anisotropic film.

11. The laminate according to claim 10 ,
wherein the other optically anisotropic film is a λ/4 plate.

12. A circularly polarizing plate comprising:
the optically anisotropic film according to claim 2 ;
a λ/4 plate; and
a polarizer.

13. A display device comprising:
a display element; and
the optically anisotropic film according to claim 2 , arranged on the display element.

14. The optically anisotropic film according to claim 3 ,
wherein a liquid crystal compound is included, and
the liquid crystal compound is vertically aligned and thus fixed.

15. A laminate comprising:
the optically anisotropic film according to claim 3 ; and
another optically anisotropic film different from the optically anisotropic film.

16. The laminate according to claim 15 ,
wherein the other optically anisotropic film is a λ/4 plate.

17. A circularly polarizing plate comprising:
the optically anisotropic film according to claim 3 ;
a λ/4 plate; and
a polarizer.

18. A display device comprising:
a display element; and
the optically anisotropic film according to claim 3 , arranged on the display element.

19. A laminate comprising:
the optically anisotropic film according to claim 4 ; and
another optically anisotropic film different from the optically anisotropic film.

20. The laminate according to claim 19 ,
wherein the other optically anisotropic film is a λ/4 plate.

Assignees

• Fujifilm Corp

Inventors

• Nishikawa Hideyuki
• Goto Ryoji
• FUJINO Yuuta
• ARAYASU Mirei
• Nakamura Yuki

Classifications

• H10K59/8791

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

• G02F1/13363 Primary

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/133631 Primary

  with a spatial distribution of the retardation value · CPC title

• H05B33/02

  Details · CPC title

• G02F1/133632

  with refractive index ellipsoid inclined relative to the LC-layer surface · CPC title