Laminate and window

• US 10,642,085 B2
• Filed: 01/30/2018
• Issued: 05/05/2020
• Est. Priority Date: 07/31/2015
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Yanai, Yujiro, Yamamoto, Akira
• Primary Examiner(s): Choudhury, Mustak
• Application Number:
  US15/883,731
• Publication Number:
  US 20180157068A1
• Time in Patent Office: 826 Days
• Field of Search: 35948501, 35948706, 35948915, 35948907, 35948903, 35949201, 428 11, 428336, 4284111, 428 13, 428 133, 428532, 427 66, 349 9, 349 96, 349102, 349117, 349118, 349121, 156324
• CPC Class Codes: G02B 1/00 Optical elements characterised by the material of which they are made; Optical coatings for optical elements
• CPC Class Codes: G02B 27/288 Filters employing polarising elements, e.g. Lyot or Solc filters G02B5/3016 takes precedence
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: 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
• CPC Class Codes: G02F 1/133368 Cells having two substrates with different characteristics, e.g. different thickness or material
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133538 with spatial distribution of the polarisation direction
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133631 with a spatial distribution of the retardation value

Abstract

Provided is a laminate including first and second patterned polarizers, a patterned optical anisotropic layer disposed between the first and second patterned polarizers, and an optically anisotropic layer disposed between the first patterned polarizer and the patterned optical anisotropic layer; in which an angle formed between an absorption axis of each of polarization regions of the second patterned polarizer and a slow axis of each of phase difference regions of the patterned optical anisotropic layer that is superposed on each of the polarization regions of the second patterned polarizer is 0°±5° or 90°±5°; an absolute value of Rth of the optically anisotropic layer is 50 to 150 nm; at least one of the first or second patterned polarizers is movable; and a white display state and a black display state are switched with each other. Also provided is a window.

Claims

1. A laminate comprising:

a first patterned polarizer;

a second patterned polarizer,

a patterned optical anisotropic layer disposed between the first patterned polarizer and the second patterned polarizer; and

an optically anisotropic layer disposed between the first patterned polarizer and the patterned optical anisotropic layer,

wherein the laminate comprises one sheet of the patterned optical anisotropic layer,

each of the first patterned polarizer and the second patterned polarizer has two or more polarization regions having different absorption axis directions in a plane of the first patterned polarizer or the second patterned polarizer,

the patterned optical anisotropic layer has two or more phase difference regions having different slow axis directions in a plane of the patterned optical anisotropic layer,

an angle formed between the absorption axis of each of the polarization regions of the second patterned polarizer and the slow axis of each of the phase difference regions of the patterned optical anisotropic layer that is superposed on each of the polarization regions of the second patterned polarizer is 0°

±

5°

or 90°

±

5°

,

an absolute value of a retardation Rth of the optically anisotropic layer at a wavelength of 550 nm in a film thickness direction of the optically anisotropic layer is 50 to 150 nm,

at least one of the first patterned polarizer or the second patterned polarizer is movable, and

a white display state, in which an angle formed between the absorption axis of each of the polarization regions of the first patterned polarizer and the absorption axis of each of the polarization regions of the second patterned polarizer that is superposed on each of the polarization regions of the first patterned polarizer is 0°

±

5° and

a transmittance obtained in a case where light incident on the first patterned polarizer exits from the second patterned polarizer is maximized, and a black display state, in which an angle formed between the absorption axis of each of the polarization regions of the first patterned polarizer and the absorption axis of each of the polarization regions of the second patterned polarizer that is superposed on each of the polarization regions of the first patterned polarizer is 90°

±

5° and

the transmittance obtained in a case where the light incident on the first patterned polarizer exits from the second patterned polarizer is minimized, are switched with each other.

2. The laminate according to claim 1,

wherein each of the first patterned polarizer and the second patterned polarizer has first polarization regions and second polarization regions which have different absorption axis directions in the plane of the first patterned polarizer or the plane of the second patterned polarizer and alternate with each other,

an angle formed between the absorption axis direction of each of the first polarization regions and the absorption axis direction of each of the second polarization regions is 90°

±

5°

,

the patterned optical anisotropic layer has first phase difference regions and second phase difference regions which have different slow axis directions in the plane of the patterned optical anisotropic layer and alternate with each other,

an angle formed between the slow axis direction of each of the first phase difference regions and the slow axis direction of each of the second phase difference regions is 90°

±

5°

, and

an angle formed between the absorption axis of each of the first polarization regions of the second patterned polarizer and the slow axis of each of the first phase difference regions of the patterned optical anisotropic layer that is superposed on each of the first polarization regions of the second patterned polarizer is 0°

±

5°

or 90°

±

5.

3. The laminate according to claim 1,

wherein each of the first patterned polarizer and the second patterned polarizer has three or more polarization regions which have different absorption axis directions within the plane of the first patterned polarizer or the second patterned polarizer and in which the absorption axis directions continuously change,

the patterned optical anisotropic layer has three or more phase difference regions which have different slow axis directions within the plane of the patterned optical anisotropic layer and in which the slow axis directions continuously change, and

an angle formed between the absorption axis of each of the polarization regions of the second patterned polarizer and the slow axis of each of the phase difference regions of the patterned optical anisotropic layer that is superposed on each of the polarization regions of the second patterned polarizer is 0°

±

5°

or 90°

±

5.

4. The laminate according to claim 1,

wherein the patterned optical anisotropic layer is a +A-plate in which a retardation Re(550) at a wavelength of 550 nm equals 110 to 160 nm in an in-plane direction of the patterned optical anisotropic layer, and

the optically anisotropic layer is a +C-plate in which a retardation Rth(550) at a wavelength of 550 nm equals −

50 to −

150 nm in the film thickness direction of the optically anisotropic layer.

5. The laminate according to claim 4,

wherein the +A-plate has reciprocal wavelength dispersion in which a retardation Re(450) at a wavelength of 450 nm in the in-plane direction of the +A-plate, the retardation Re(550) at a wavelength of 550 nm in the in-plane direction of the +A-plate, and a retardation Re(630) at a wavelength of 630 nm in the in-plane direction of the +A-plate satisfy Re(450)/Re(550)<

1 and Re(630)/Re(550)>

1.

6. The laminate according to claim 4,

wherein the +C-plate has reciprocal wavelength dispersion in which a retardation Re(450) at a wavelength of 450 nm in the in-plane direction of the +C-plate, the retardation Re(550) at a wavelength of 550 nm in the in-plane direction of the +C-plate, and the retardation Re(630) at a wavelength of 630 nm in the in-plane direction of the +C-plate satisfy Re(450)/Re(550)<

1 and Re(630)/Re(550)>

1.

7. The laminate according to claim 1,

wherein the patterned optical anisotropic layer is a −

A-plate in which a retardation Re(550) at a wavelength of 550 nm equals 110 to 160 nm in an in-plane direction of the patterned optical anisotropic layer, and the optically anisotropic layer is a −

C-plate in which a retardation Rth(550) at a wavelength of 550 nm equals 50 to 150 nm in the film thickness direction of the patterned optical anisotropic layer.

8. The laminate according to claim 1,

wherein in the optically anisotropic layer, the retardation Re(550) at a wavelength of 550 nm equals −

10 to 10 nm in the in-plane direction of the patterned optical anisotropic layer.

9. The laminate according to claim 1,

wherein the patterned optical anisotropic layer contains a liquid crystal compound.

10. A window comprising the laminate according to claim 1.