KR102377345B1 - Polarizing plate, image display device and method for preparing polarizing plate - Google Patents

Abstract

This invention provides the polarizing plate which can suppress the crack resulting from a temperature change in the notch of a polarizer.
The polarizing plate 1A is provided with the film-shaped polarizer 7, the recessed part 7C is formed in the edge part 7e of the polarizer 7, and the reference line L is the cut-out part 7C. When defined as a straight line connecting a pair of corner portions 7C1 and 7C2 positioned at both ends of It is the width of the notch 7C in the direction parallel to , W is the width of the whole polarizer 7 in the direction parallel to the reference line L, and Wc/W is 0.05 or more and less than 1.0.

Description

A polarizing plate, an image display apparatus, and the manufacturing method of a polarizing plate TECHNICAL FIELD

The present invention relates to a polarizing plate, an image display device, and a method for manufacturing a polarizing plate.

A polarizing plate is one of the optical components which comprise image display apparatuses, such as a liquid crystal television, an organic electroluminescent television, or a smart phone. A polarizing plate is equipped with a film-type polarizer, and the optical film (for example, protective film) which overlaps with the polarizer. For design reasons of the image display apparatus, there are cases where a cut-out portion is formed at the end of the polarizer. For example, in Patent Document 1 below, it is described that a cutout is formed at an end of a polarizer as an injection port of a liquid crystal.

Patent Document 1: Japanese Patent Laid-Open No. 2000-155325

A polarizer expands or contracts according to a change in temperature. As a result of the study by the present inventors, it became clear that cracks were formed in the cutouts due to the shrinkage of the polarizer according to the temperature change. In particular, cracks are easily formed by thermal shock (abrupt temperature change).

This invention was made in view of the said circumstances, WHEREIN: It is an object of providing the polarizing plate which can suppress the crack resulting from a temperature change, the image display apparatus containing this polarizing plate, and the manufacturing method of a polarizing plate. do it with

A polarizing plate according to an aspect of the present invention includes a film-type polarizer, a concave cutout is formed at an end of the polarizer, and a reference line (L) connects a pair of corners positioned at both ends of the cutout When defined as a straight line, the reference line L is not perpendicular to the absorption axis A of the polarizer, Wc is the width of the cutout in the direction parallel to the reference line L, and W is the reference line L It is the width|variety of the whole polarizer in a parallel direction, and Wc/W is 0.05 or more and less than 1.0. In other words, the angle θ between the reference line L and the absorption axis A of the polarizer is 0° or more and less than 90°.

In one aspect of the present invention, the polarizer may have a first end and a second end positioned opposite to the first end, and a cutout may be formed in the first end, and the cutout is at the first end. It may extend toward the 2nd end part, and the direction (E) in which a notch part extends does not need to be parallel to the absorption axis line (A) of a polarizer. In other words, the angle α formed by the direction E in which the cutout extends with the absorption axis A of the polarizer may be greater than 0° and less than or equal to 90°.

A method of manufacturing a polarizing plate according to an aspect of the present invention includes a process of manufacturing a first laminate including a polarizer film and at least one optical film overlapping the polarizer film, and processing the first laminate, the polarizer film A method comprising: forming a second laminate having a first end that is not perpendicular to the absorption axis A; and forming a concave cutout in the first end of the second laminate, the reference line L ) is defined as a straight line connecting a pair of corners located at both ends of the cutout, Wc is the width of the cutout in a direction parallel to the reference line L, and W is parallel to the reference line L It is the width|variety of the whole polarizer in one direction, and Wc/W is adjusted to 0.05 or more and less than 1.0.

In the method of manufacturing a polarizing plate according to an aspect of the present invention, the second laminate may have a second end positioned opposite to the first end, and a cutout portion may extend from the first end toward the second end. Further, the direction (E) in which the notch extends may be adjusted in a direction not parallel to the absorption axis (A). In other words, the angle α formed by the direction E in which the cutout extends with the absorption axis A of the polarizer film (polarizer) may be adjusted to be greater than 0° and less than or equal to 90°.

A polarizing plate according to another aspect of the present invention includes a film-type polarizer, the polarizer has a first end and a second end positioned opposite to the first end, and a concave cutout is formed at the first end, wherein the cutout extends from the first end toward the second end, the direction E in which the cutout extends is not parallel to the absorption axis A of the polarizer, and Wc is parallel to the first end It is the width of the notch in in, W is the width of the whole polarizer in the direction parallel to a 1st edge part, and Wc/W is 0.05 or more and less than 1.0. In other words, in the polarizing plate according to another aspect of the present invention, the angle α formed by the direction (E) in which the cutout extends with the absorption axis (A) of the polarizer is greater than 0° and less than or equal to 90°.

A method for manufacturing a polarizing plate according to another aspect of the present invention includes a step of manufacturing a first laminate including a polarizer film and at least one optical film superimposed on the polarizer film, and processing the first laminate, the first end and a step of manufacturing a second laminate having a second end positioned opposite to the first end, and forming a concave cutout in the first end, wherein the cutout is formed from the first end to the second end. extended toward the end, and the direction (E) in which the cutout extends is adjusted to a direction not parallel to the absorption axis (A), Wc is the width of the cutout in a direction parallel to the first end, W It is the width of the whole polarizer in the direction parallel to a 1st edge part, and Wc/W is adjusted to 0.05 or more and less than 1.0. In other words, the angle α formed by the direction E in which the cutout extends with the absorption axis A of the polarizer film (polarizer) is adjusted to be greater than 0° and less than or equal to 90°.

In any of the said aspects of this invention, the protective film or protective layer may be closely_contact|adhered to both surfaces of a polarizer.

In any of the said aspects of this invention, the protective film or protective layer may be closely_contact|adhered to only one surface among the both surfaces of a polarizer. In any of the said aspects of this invention, the deep part of a cutout may be chamfered.

The image display device according to any one of the above aspects of the present invention includes the polarizing plate.

ADVANTAGE OF THE INVENTION According to this invention, in the notch of a polarizer, the polarizing plate which can suppress the crack resulting from a temperature change, the image display apparatus containing this polarizing plate, and the manufacturing method of a polarizing plate are provided.

1 is a schematic perspective view of a polarizing plate according to a first embodiment of the present invention.
(a) of FIG. 2 is a top view of a polarizer included in the polarizing plate shown in FIG. 1, and (b) is a modified example of the polarizer shown in (a).
FIG. 3 is a top view of a polarizer included in the polarizing plate shown in FIG. 1 , and is an enlarged view of FIG. 2A .
4 is a schematic diagram of a cross section of an image display device (liquid crystal display device) according to a first embodiment of the present invention.
5 is a schematic perspective view of a polarizing plate according to a second embodiment of the present invention.
6 is a schematic diagram of a cross section of an image display device (liquid crystal display device) according to a second embodiment of the present invention.
7 (a) is a top view of a polarizer provided with a polarizing plate according to another embodiment of the present invention, (b) is a top view of a polarizer provided with a polarizing plate according to another embodiment of the present invention, (c) is this view It is a top view of the polarizer with which the polarizing plate which concerns on another embodiment of the invention is equipped.
8 (a) is a top view of a polarizer provided with a polarizing plate according to another embodiment of the present invention, (b) is a top view of a polarizer provided with a polarizing plate according to another embodiment of the present invention, (c) is this view It is a top view of a polarizer provided with a polarizing plate according to an embodiment of the present invention.
9 is a top view of a polarizer included in a polarizing plate according to another embodiment of the present invention.
10 is a top view of a polarizer included in a polarizing plate according to another embodiment of the present invention.
11 is a schematic perspective view of a polarizing plate according to a comparative example of the present invention.
12 is a top view of a polarizer included in the polarizing plate shown in FIG. 11 .
13 is a top view of a polarizer included in a polarizing plate according to some embodiments of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described, referring drawings. In the drawings, equal reference numerals are given to equal components. The present invention is not limited to the following embodiments. X, Y, and Z shown in each figure mean three mutually orthogonal coordinate axes. The direction indicated by each coordinate axis is common to all drawings.

(First embodiment)

A first embodiment will be described based on Figs. 1, 2(a), 2(b) and Fig. 3 . A polarizing plate 1A according to the first embodiment includes a film-shaped polarizer 7 and a plurality of optical films 3 , 5 , 9 , 13 overlapping the polarizer 7 . The polarizer 7 and the plurality of optical films 3, 5, 9, 13 are all quadrangular. An "optical film" means the film-shaped member (excluding the polarizer itself) which comprises a polarizing plate. The optical film may also be referred to as a layer or an optical layer. Optical film includes, for example, a protective film and a release film. In the first embodiment, the plurality of optical films 3 , 5 , 9 and 13 are the first protective film 5 , the second protective film 9 , the third protective film 3 , and the release film 13 . (separator). That is, 1 A of polarizing plate is equipped with the polarizer 7, the 1st protective film 5, the 2nd protective film 9, the 3rd protective film 3, and the release film 13. As shown in FIG. The polarizing plate 1A also includes an adhesive layer 11 positioned between the second protective film 9 and the release film 13 . The first protective film 5 is overlapped on one surface of the polarizer 7 , and the second protective film 9 is overlapped on the other surface of the polarizer 7 . That is, the protective film (protective layer) is closely_contact|adhered to both surfaces of the polarizer 7 . The third protective film 3 is superimposed on the first protective film 5 . That is, the first protective film 5 is positioned between the polarizer 7 and the third protective film 3 . The release film 13 is superposed on the second protective film 9 through the adhesive layer 11 . In other words, the second protective film 9 is positioned between the polarizer 7 and the adhesive layer 11 .

A concave cut-out portion 7C (concave cut-out portion) is formed at an end portion (first end portion 7e) of the polarizer 7 . This notch 7C is the polarizer 7 and the optical film 3 in the lamination|stacking direction (Z-axis direction) of the polarizer 7, the optical films 3, 5, 9, 13, and the adhesion layer 11. , 5 , 9 , 13 ) and the adhesive layer 11 . That is, in the end face of the polarizing plate 1A, a concave cutout common to all of the polarizer 7 constituting the polarizing plate 1A, the optical films 3, 5, 9, 13, and the adhesive layer 11 is provided. is formed The shape of the cut-out portion 7C of the polarizer 7 viewed from the lamination direction (Z-axis direction) may be the same as or similar to the shape of the cut-out portion of the polarizing plate 1A viewed from the lamination direction. You may consider the shape of the cut-out part of 1 A of polarizing plate seen from the lamination direction to be the shape of the cut-out part 7C of the polarizer 7 seen from the lamination|stacking direction. Hereinafter, not only the cutout 7C of the polarizer 7 but also the cutout of the polarizing plate 1A including the cutout 7C may be referred to as "the cutout 7C". The cutout 7C is rectangular, for example.

The reference line L is defined as a straight line connecting a pair of corner portions 7C1 and 7C2 positioned at both ends of the cut-out portion 7C. The reference line L may be referred to as a straight line connecting the pair of corner portions 7C1 and 7C2 in a direction perpendicular to the above-described stacking direction (Z-axis direction). This reference line L is not perpendicular to the absorption axis A of the polarizer 7 . In other words, the angle θ between the reference line L of the cutout 7C and the absorption axis A of the polarizer 7 is 0° or more and less than 90°. The absorption axis line A may be changed to be, for example, a straight line substantially parallel to the orientation direction of the polyvinyl alcohol (PVA) molecules in the polarizer 7 . The absorption axis line A may be changed to be, for example, a straight line substantially parallel to the orientation direction of the dye molecules (eg, polyiodine or organic dye) adsorbed to polyvinyl alcohol in the polarizer 7 . It can be said that a plurality of carbon atoms constituting one PVA molecule are mutually bonded by a covalent bond (CC bond) along the absorption axis (A). On the other hand, in the direction substantially perpendicular to the absorption axis A, PVA molecules are bonded to each other by crosslinking through a crosslinking agent (eg, boric acid). In other words, in the direction substantially perpendicular to the absorption axis A, the hydroxyl group of each PVA molecule forms a hydrogen bond or an oxygen-boron bond (OB bond) with boric acid located between the PVA molecules, so that PVA molecules are mutually exclusive. is cross-linked. The CC bond formed along the absorption axis (A) is stronger than the crosslinked bond formed along the direction substantially perpendicular to the absorption axis (A). Therefore, the mechanical strength of the polarizer 7 in the direction substantially parallel to the absorption axis A is higher than the mechanical strength of the polarizer 7 in the direction substantially perpendicular to the absorption axis A. In other words, the thermal contraction of the polarizer 7 in a direction substantially parallel to the absorption axis A is less likely to cause cracks than the thermal contraction of the polarizer 7 in a direction substantially perpendicular to the absorption axis A .

Like the conventional polarizing plate 1C shown in FIGS. 11 and 12 , when the reference line L is orthogonal to the absorption axis A (when the angle θ is 90°), it is parallel to the reference line L In the direction, weak cross-links are formed compared to the CC bonds in the PVA molecule. Therefore, when the reference line L is orthogonal to the absorption axis A, the deep portion (inner portion) of the cut-out portion 7C contracts in a direction substantially parallel to the reference line L, the cut-out portion 7C A crack 7cr is likely to be formed in the deep part of the

On the other hand, in the first embodiment, the reference line L is not orthogonal to the absorption axis A of the polarizer 7 . In other words, the angle θ between the reference line L and the absorption axis A is 0° or more and less than 90°. Therefore, the CC bond in the PVA molecule, which is stronger than the cross-linkage between the PVA molecules, increases the mechanical strength of the polarizer 7 in the direction parallel to the reference line L. As a result, even if the deep part of 7C of cutouts shrinks in the direction substantially parallel to the reference line L, the crack 7cr is hard to form in the deep part of 7C of cutouts. In particular, when the reference line L is parallel to the absorption axis A (when the angle θ is 0°), the CC bonds in most of the PVA molecules constituting the polarizer 7 follow the absorption axis A is being formed Therefore, when the reference line L is parallel to the absorption axis A, the mechanical strength of the polarizer 7 in the direction parallel to the reference line L is remarkably high, and cracks 7cr in the cutout 7C ) formation is significantly suppressed.

The smaller the angle θ between the reference line L and the absorption axis A is, the more difficult it is to form the crack 7cr in the cutout 7C. The angle θ may be 0° or more and 75° or less, or 0° or more and 60° or less.

The polarizer 7 has a first end portion 7e in which a cutout portion 7C is formed, and a second end portion 17e positioned opposite to the first end portion 7e. In the first embodiment, both the first end 7e and the second end 17e are straight, and the first end 7e is parallel to the second end 17e. The cutout 7C extends from the first end 7e toward the second end 17e. The direction E in which the cutout 7C extends is not parallel to the absorption axis A of the polarizer 7 . In other words, the angle α formed by the direction E in which the cutout 7C extends with the absorption axis A is greater than 0° and less than or equal to 90°. In the first embodiment, the angle α is 90°. In the first embodiment, the direction E in which the cut-out portion 7C extends is the same as the longitudinal direction of the cut-out portion 7C. That is, the longitudinal direction of the notch 7C is along the direction E in which the notch 7C extends.

Since the direction (E) in which the cutout portion (7C) extends is not parallel to the absorption axis (A) of the polarizer (7), the CC bond in the PVA molecule, which is stronger than the cross-linkage between the PVA molecules, is in the direction (E) The mechanical strength of the polarizer 7 in the direction perpendicular|vertical to is raised. As a result, even if the core of the cut-out 7C contracts in the direction substantially perpendicular to the direction E, the crack 7cr is hardly formed in the deep section of the cut-out 7C. The larger the angle α between the direction E and the absorption axis A, the more difficult it is to form the crack 7cr in the cutout 7C. In particular, when the direction E is perpendicular to the absorption axis A (when the angle α is 90°), the CC bonds in most of the PVA molecules constituting the polarizer 7 are perpendicular to the direction E. is being formed with Therefore, when the direction E is perpendicular to the absorption axis A, the mechanical strength of the polarizer 7 in the direction perpendicular to the direction E is remarkably high, and cracks 7cr in the cutout 7C ) formation is significantly suppressed.

The width Wc of the cutout 7C in the direction parallel to the reference line L may be, for example, 2 mm or more and less than 600 mm, or 5 mm or more and 30 mm or less. The width Wc may be referred to as the width of the cut-out portion 7C in a direction parallel to the end portion (the first end portion 7e) of the polarizer 7 . The width W of the entire polarizer 7 in the direction parallel to the reference line L may be, for example, 30 mm or more and 600 mm or less. The width W of the whole polarizer 7 may be said to be the width|variety of the whole polarizing plate 1A in the direction parallel to the reference line L in other words. The width W may be said to be the width of the entire polarizer 7 in a direction parallel to the first end portion 7e. The width Wc of the notch 7C should just be less than the width W of the polarizer 7 whole, for example. When the width Wc of the cutout 7C is 5 mm or more and 30 mm or less, the overall width W of the polarizer 7 (the overall width of the polarizing plate 1A) is greater than 20 mm and 160 mm or less, preferably may be greater than 25 mm and less than or equal to 130 mm, more preferably greater than 30 mm and less than or equal to 100 mm, still more preferably greater than 30 mm and less than or equal to 70 mm (provided that Wc<W). Ratio Wc/W of the width Wc of 7C of cutouts and the width W of the whole polarizer 7 is 0.05 or more and less than 1.0. The ratio Wc/W is 0.08 or more and less than 1.0, 0.10 or more and less than 1.0, or 0.13 or more and less than 1.0, preferably 0.15 or more and less than 1.0, or 0.17 or more and less than 1.0, more preferably 0.20 or more and less than 1.0, or 0.22 or more and less than 1.0; More preferably, 0.30 or more and less than 1.0, 0.33 or more and less than 1.0, or 0.40 or more and less than 1.0 may be sufficient. Ratio Wc/W may be 0.05 or more and 0.90 or less, 0.05 or more and 0.80 or less, 0.05 or more and 0.78 or less, or 0.05 or more and 0.45 or less. Ratio Wc/W may be said in other words as ratio of the width Wc of 7 C of cutouts, and the width W of 1 A of polarizing plate whole. When the ratio (Wc/W) is in the above-described range, cracks in the cut-out portion 7C are easily suppressed. The reason for this is as follows. As the width Wc of the cutout 7C is smaller than the overall width W of the polarizer 7, the width Wc of the cutout 7C is widened by the shrinkage of the entire polarizer 7 according to the temperature change. It is easy to generate a force, and it is easy to produce a crack in 7 C of cutouts. That is, cracks are more likely to occur in the cut-out portion 7C, so that Wc/W is smaller. On the other hand, as Wc/W is large (the overall width W of the polarizer 7 is small), the amount of shrinkage of the entire polarizer 7 according to the temperature change is reduced. That is, the absolute value of the change amount of the width W of the whole polarizer 7 is reduced, so that the width W of the whole polarizer 7 is small. When the amount of shrinkage of the whole polarizer 7 accompanying a temperature change is reduced, it is hard to produce the force which widens the width Wc of 7 C of cutouts, and it is easy to suppress the crack in 7C of cutouts.

The length Dc of the cutout 7C in the direction perpendicular to the reference line L may be, for example, 1 mm or more and 30 mm or less. In other words, the length Dc may be referred to as the depth of the notch 7C in the direction perpendicular to the reference line L. The length D of the entire polarizer 7 in the direction perpendicular to the reference line L may be, for example, 30 mm or more and 600 mm or less. The length D of the polarizer 7 whole may be said to be the length of the whole polarizing plate 1A in the direction perpendicular|vertical to the reference line L in other words. The thickness of the polarizing plate 1A may be, for example, 10 µm or more and 1200 µm or less, 10 µm or more and 500 µm or less, 10 µm or more and 300 µm or less, or 10 µm or more and 200 µm or less.

The manufacturing method of 1 A of polarizing plate is provided with a bonding step and a processing step at least. In a bonding step, a laminated body (1st laminated body) is produced by bonding a long strip|belt-shaped polarizer film and a long strip|belt-shaped some optical film. The elongate strip-shaped polarizer film is the polarizer 7 before processing and shaping|molding. The absorption axis of the polarizer film may be the same as the absorption axis A of the polarizer 7 after processing and molding. The plurality of long strip-shaped optical films are optical films 3, 5, 9, and 13 before processing and molding. In the subsequent processing step, the first laminate is processed to produce a plurality of laminates (second laminate) having desired dimensions and shapes. This second laminate has a first end 7e that is not orthogonal to the absorption axis A of the polarizer film (polarizer 7) and the opposite side of the first end 7e, similarly to the above-described polarizing plate 1A. and a second end 17e located at In the processing step, for example, in a direction not orthogonal to the absorption axis A of the polarizer film, the first laminate may be cut to form a first end portion not orthogonal to the absorption axis A. In a processing step, you may produce a 2nd laminated body by cutting|disconnecting a 1st laminated body with a cutter, for example. In the processing step, for example, the second laminate may be produced by punching the first laminate. In the processing step, for example, the second laminate may be produced by cutting the first laminate with a laser. The laser may be, for example, a CO ₂ laser or an excimer laser. In the processing step, for example, the second laminate may be produced by combining the aforementioned cutting using a cutting tool, punching processing, and cutting using a laser. After processing the first laminate by the above-described processing method to adjust the dimension of the first laminate to be larger than a predetermined dimension, the end of the first laminate is milled and polished to produce a second laminate, also good

In the processing step, for example, the concave cutout 7C may be formed in the first end 7e of the second laminate by punching or cutting using a knife or laser. In the case of forming the cut-out portion 7C in the machining step, the cut-out portion 7C is extended from the first end portion 7e toward the second end portion 17e, and further, the direction E in which the cut-out portion 7C extends. ) is adjusted in a direction that is not parallel to the absorption axis (A). After producing the 2nd laminated body in which 7 C of cutouts were formed in a processing step, you may perform an edge processing step. In the end machining step, for example, using an endmill, the end face of the second laminate including the cut-out portion 7C may be cut and polished. An end mill is a type of milling for cutting. An end mill is, for example, a blade located on a side surface substantially parallel to the rotation axis, and cuts and grinds the end surface of the 2nd laminated body containing 7C of cutouts. As a result, the end face of the second laminate including the cut-out portion 7C is finished smooth. By using this end mill, a 2nd laminated body can be shape|molded into 1 A of polarizing plates which have a desired shape and dimension in a short time. That is, the productivity of the polarizing plate 1A improves. In the processing step, the first laminate may be punched larger than in the prior art to produce the second laminate, and in the subsequent end processing step, the end face of the second laminate may be cut and polished with an end mill. As a result, the margin of the edge part removed from the 2nd laminated body in an edge processing step is reduced, generation|occurrence|production of foreign materials, such as grinding|polishing scum, in an edge processing step is suppressed, and a foreign material product (polarizing plate 1A) ) is inhibited.

Instead of forming the cutout 7C in the machining step, the concave cutout 7C may be formed in the first end 7e of the second laminate in the end machining step following the machining step. Also in the case of forming the cut-out portion 7C in the end processing step, the cut-out portion 7C is extended from the first end portion 7e toward the second end portion 17e, and the direction in which the cut-out portion 7C extends. Adjust (E) in a direction not parallel to the absorption axis (A). In the end processing step, for example, the notch 7C may be formed in the second laminate by irradiating the above-described laser to the end of the second laminate to cut a part or all of the end. You may form the cutout part 7C in the 2nd laminated body by the end processing step using the said end mill. In addition, Wc/W is adjusted to 0.05 or more and less than 1.0 in any of the above processing steps or end processing steps.

The direction of the absorption axis A of the polarizer 7 contained in the 2nd laminated body is already grasped|ascertained at the time of a processing step and an edge processing step. Therefore, for example, as described above, by adjusting the punching or cutting direction of the first laminate, the angle between the first end 7e of the second laminate and the absorption axis A is set to 0° or more and less than 90°. By adjusting, the angle θ between the reference line L and the absorption axis A can be freely controlled within a range of 0° or more and less than 90°. Further, as described above, when the cut-out portion 7C is formed in the first end portion 7e of the second laminate, by adjusting the direction of the cut-out portion 7C, the direction E is changed to the absorption axis line A. It is also possible to freely control the angle α formed with the ? As described above, the relative positional relationship between the reference line L and the absorption axis A depends on the direction of punching or cutting of the first laminate and the position at which the cutout 7C is formed in the second laminate. Controlled. The relative positional relationship between the direction E and the absorption axis A is controlled by the position at which the cutout 7C is formed in the second laminate and the direction of the cutout 7C. The direction itself of the absorption axis A in the polarizer film (polarizer 7) is adjusted and controlled by the stretching direction and the stretching ratio of the PVA film performed before the processing step and the end processing step.

The polarizer 7 may be a film-type polyvinyl alcohol-based resin (PVA film) produced by processes such as stretching, dyeing and crosslinking. The details of the polarizer 7 are as follows.

For example, the PVA film is first stretched in the uniaxial direction or the biaxial direction. The dichroic ratio of the polarizer 7 stretched in the uniaxial direction tends to be high. Following stretching, using a dyeing solution, the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye. The dyeing solution may contain boric acid, zinc sulfate or zinc chloride. The PVA film may be washed with water before dyeing. By washing with water, dirt and antiblocking agent are removed from the surface of the PVA film. Moreover, as a result of which a PVA film swells by water washing, it is easy to suppress the unevenness of dyeing (non-uniform dyeing|dyeing). The dyed PVA film is treated with a solution of a crosslinking agent (eg, aqueous solution of boric acid) for crosslinking. After treatment with a crosslinking agent, the PVA film is washed with water and then dried. The polarizer 7 can be obtained through the above procedure. Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. The polyvinyl acetate-based resin may be, for example, polyvinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer (eg, ethylene-vinyl acetate copolymer). The other monomer copolymerized with vinyl acetate may be, other than ethylene, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides having an ammonium group. The polyvinyl alcohol-based resin may be modified with aldehydes. The modified polyvinyl alcohol-based resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal or polyvinyl butyral. The polyvinyl alcohol-type resin may be a polyene-based oriented film such as a dehydration treatment product of polyvinyl alcohol or a dehydrochloric acid treatment product of polyvinyl chloride. Dyeing may be performed before extending|stretching, and you may extend|stretch in a dyeing solution. The length of the extended polarizer 7 may be 3 to 7 times the length before extending|stretching, for example.

The thickness of the polarizer 7 may be, for example, 1 µm or more and 50 µm or less, 1 µm or more and 10 µm or less, 1 µm or more and 8 µm or less, 1 µm or more and 7 µm or less, or 4 µm or more and 30 µm or less. As the polarizer 7 is thinner, the shrinkage of the polarizer 7 itself according to the temperature change is suppressed, and the dimensional change of the polarizer 7 itself is suppressed. As a result, stress hardly acts on the polarizer 7, and cracks in the polarizer 7 are easily suppressed.

The first protective film 5 and the second protective film 9 may be formed of a translucent thermoplastic resin, and may be an optically transparent thermoplastic resin. The resin constituting the first protective film 5 and the second protective film 9 is, for example, a chain polyolefin-based resin, a cyclic olefin polymer-based resin (COP-based resin), a cellulose ester-based resin, a polyester-based resin, or a polycarbonate. Resin, (meth)acrylic resin, polystyrene resin, or a mixture or copolymer thereof may be used. The composition of the first protective film 5 may be completely the same as that of the second protective film 9 . The composition of the first protective film 5 may be different from the composition of the second protective film 9 .

The chain polyolefin resin may be, for example, a homopolymer of a chain olefin such as a polyethylene resin or a polypropylene resin. The chain polyolefin resin may be a copolymer composed of two or more chain olefins.

The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a ring-opened (co)polymer of a cyclic olefin or an addition polymer of a cyclic olefin. The cyclic olefin polymer resin may be, for example, a copolymer (eg, a random copolymer) of a cyclic olefin and a chain olefin. The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer-type resin may be the graft polymer which modified|denatured the said polymer with unsaturated carboxylic acid or its derivative(s), or these hydrides may be sufficient as it. The cyclic olefin polymer-based resin may be, for example, a norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer.

The cellulose ester-based resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate or cellulose dipropionate. You may use these copolymers. A cellulose ester-based resin in which a part of the hydroxyl group is modified with another substituent may be used.

You may use polyester-type resin other than a cellulose-ester-type resin. The polyester-based resin may be, for example, a polycondensate of a polyhydric carboxylic acid or a derivative thereof and a polyhydric alcohol. Dicarboxylic acid or its derivative(s) may be sufficient as polyhydric carboxylic acid or its derivative(s). The polyhydric carboxylic acid or its derivative may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate or dimethyl naphthalenedicarboxylic acid. The polyhydric alcohol may be, for example, a diol. The polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentyl glycol or cyclohexanedimethanol.

The polyester-based resin is, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate or polycyclohexanedimethyl or A phthalate may be sufficient.

The polycarbonate-based resin is a polymer in which a polymerization unit (monomer) is bonded through a carbonate group. The polycarbonate-based resin may be a modified polycarbonate having a modified polymer skeleton, or may be a copolymerized polycarbonate.

The (meth)acrylic resin includes, for example, poly(meth)acrylic acid ester (eg polymethyl methacrylate (PMMA)); methyl methacrylate-(meth)acrylic acid copolymer; methyl methacrylate-(meth)acrylic acid ester copolymer; methyl methacrylate-acrylic acid ester-(meth)acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (eg MS resin); A copolymer of methyl methacrylate and a compound having an alicyclic hydrocarbon group (eg, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-(meth) acrylate norbornyl copolymer, etc.) may be used.

At least one optical film of a pair of optical films (1st protective film 5 and 2nd protective film 9) with the polarizer 7 interposed therebetween may contain triacetyl cellulose (TAC). At least one optical film of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 7 sandwiched therebetween contains a cyclic olefin polymer-based resin (COP-based resin), also good At least one optical film among a pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 7 interposed therebetween may contain polymethyl methacrylate (PMMA). . Both of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 7 sandwiched therebetween may contain triacetyl cellulose. One of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 7 interposed therebetween contains triacetyl cellulose and has the polarizer 7 interposed therebetween. The other film among a pair of optical films may contain a cyclic olefin polymer. One of the pair of optical films (the first protective film 5 and the second protective film 9) with the polarizer 7 interposed therebetween contains triacetyl cellulose, and the polarizer 7 is interposed therebetween. The other film among a pair of placed optical films may contain polymethyl methacrylate. One film of a pair of optical films (1st protective film 5 and 2nd protective film 9) which sandwiched the polarizer 7 contains a cyclic olefin polymer resin, and the polarizer 7 is interposed Among the pair of optical films placed in , the other film may contain polymethyl methacrylate. When the polarizer 7 is sandwiched between a pair of optical films (the first protective film 5 and the second protective film 9), the optical film (protective film) adheres to the polarizer 7 and resists temperature changes. In order to suppress the expansion or contraction of the polarizer 7 which followed, the crack in the polarizer 7 is hard to produce. For example, when the polarizer 7 is pinched|interposed between the 1st protective film 5 which consists of TAC, and the 2nd protective film 9 which consists of COP-type resin, the crack in the polarizer 7 is hard to produce.

The first protective film 5 or the second protective film 9 includes at least one additive selected from the group consisting of a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant. you can do it

The thickness of the 1st protective film 5 may be 5 micrometers or more and 90 micrometers or less, 5 micrometers or more and 80 micrometers or less, or 5 micrometers or more and 50 micrometers or less, for example. The thickness of the second protective film 9 may also be, for example, 5 µm or more and 90 µm or less, 5 µm or more and 80 µm or less, or 5 µm or more and 50 µm or less.

The first protective film 5 or the second protective film 9 may be a film having an optical function, such as a retardation film or a brightness improving film. For example, the retardation film to which arbitrary retardation values were provided can be obtained by extending|stretching the film which consists of the said thermoplastic resin, or forming a liquid crystal layer etc. on the film.

The first protective film 5 may be bonded to the polarizer 7 via an adhesive layer. The second protective film 9 may also be bonded to the polarizer 7 via an adhesive layer. The adhesive layer may contain aqueous adhesives, such as polyvinyl alcohol, and may contain the active energy ray-curable resin mentioned later.

Active energy ray-curable resin is resin hardened|cured by irradiating an active energy ray. The active energy rays may be, for example, ultraviolet rays, visible rays, electron rays, or X rays. The active energy ray-curable resin may be an ultraviolet-curable resin.

One type of resin may be sufficient as active energy ray-curable resin, and several types of resin may be included. For example, active energy ray-curable resin may contain a cationically polymerizable sclerosing|hardenable compound or radically polymerizable sclerosing|hardenable compound. Active energy ray-curable resin may contain the cationic polymerization initiator or radical polymerization initiator for starting the hardening reaction of the said curable compound.

The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in its molecule) or an oxetane compound (a compound having at least one oxetane ring in its molecule). The radically polymerizable curable compound may be, for example, a (meth)acrylic compound (a compound having at least one (meth)acryloyloxy group in its molecule). The radically polymerizable sclerosing|hardenable compound may be a vinyl-type compound which has a radically polymerizable double bond.

The active energy ray-curable resin may contain, if necessary, a cationic polymerization accelerator, an ion trap agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, an antifoaming agent, an antistatic agent, a leveling agent or a solvent. may be included.

The pressure-sensitive adhesive layer 11 may contain, for example, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, or a urethane pressure-sensitive adhesive. The thickness of the adhesive layer 11 may be, for example, 2 µm or more and 500 µm or less, 2 µm or more and 200 µm or less, or 2 µm or more and 50 µm or less.

The resin constituting the third protective film 3 may be the same as the above-mentioned resins listed as the resin constituting the first protective film 5 or the second protective film 9 . The thickness of the 3rd protective film 3 may be 5 micrometers or more and 200 micrometers or less, for example.

The resin constituting the release film 13 may be the same as the resins listed above as the resin constituting the first protective film 5 or the second protective film 9 . The thickness of the release film 13 may be, for example, 5 µm or more and 200 µm or less.

The image display device according to the present invention may be, for example, a liquid crystal display device or an organic EL display device. For example, as shown in FIG. 4 , a liquid crystal display device 30A according to the first embodiment includes a liquid crystal cell 10 and a polarizing plate 1Aa superposed on one surface (first surface) of the liquid crystal cell 10 . ) (first polarizing plate) and another polarizing plate 1Ab (second polarizing plate) superposed on the other surface (second surface) of the liquid crystal cell 10 are provided. The second surface may be referred to as a back surface of the first surface. Polarizing plates 1Aa and 1Ab shown in FIG. 4 are the same as those of polarizing plate 1A shown in FIG. 1 except that the release film 13 and the third protective film 3 are not provided. The polarizing plate 1Aa (first polarizing plate) is adhered to the first surface of the liquid crystal cell 10 via the adhesive layer 11 . Polarizing plate 1Aa (first polarizing plate) includes an adhesive layer 11 superposed on the first surface of the liquid crystal cell 10 , a second protective film 9 superposed on the adhesive layer 11 , and a second protection It has a polarizer 7 superposed on the film 9 , and a first protective film 5 superposed on the polarizer 7 . Another polarizing plate 1Ab (second polarizing plate) is adhered to the second surface of the liquid crystal cell 10 via the adhesive layer 11 . Another polarizing plate 1Ab (second polarizing plate) includes an adhesive layer 11 superposed on the second surface of the liquid crystal cell 10 , a second protective film 9 superposed on the adhesive layer 11 , and a second It has a polarizer 7 superposed on the protective film 9 , and a first protective film 5 superposed on the polarizer 7 . A liquid crystal cell 10 and a pair of polarizing plates 1Aa and 1Ab constitute a liquid crystal panel 20A. The liquid crystal panel 20A and the backlight (surface light source device) and other members constitute the liquid crystal display device 30A. The backlight and other members are omitted from FIG. 4 .

(Second embodiment)

A second embodiment of the present invention shown in Figs. 5 and 6 will be described below. Also in 2nd Embodiment, by the same mechanism as the case of 1st Embodiment, the notch part of a polarizer WHEREIN: The crack accompanying a temperature change can be suppressed. Hereinafter, matters unique to the second embodiment (the difference between the first embodiment and the second embodiment) will be described. In matters not described below, the second embodiment is common to the first embodiment.

The polarizing plate 1B which concerns on 2nd Embodiment is equipped with the 3rd protective film 3, the 1st protective film 5, the polarizer 7, the adhesion layer 11, and the release film 13. In 2nd Embodiment, the 1st protective film 5 is closely_contact|adhered to one surface among the both surfaces of the polarizer 7, and the 3rd protective film 3 is overlapped with the 1st protective film 5. As shown in FIG. Not the 2nd protective film 9 but the adhesion layer 11 is closely_contact|adhered to the other surface of the polarizer 7 directly. That is, the adhesive layer 11 is sandwiched between the polarizer 7 and the release film 13 . As described above, the polarizing plate 1B according to the second embodiment is different from the polarizing plate 1A according to the first embodiment in that the second protective film 9 is not provided. In other words, only one surface of the polarizer 7 included in the polarizing plate 1B according to the second embodiment is protected by the first protective film 5 (protective layer), and the other surface of the polarizer 7 is protected It is not protected by a film (protective layer). In general, compared to a polarizer in which both surfaces are protected by a protective film (protective layer), in a polarizer in which only one surface is protected by a protective film (protective layer), cracks due to temperature change are less likely to be formed in the notch easy. However, in the second embodiment, as in the first embodiment, since the reference line L is not orthogonal to the absorption axis A, the formation of the cracks 7cr in the cutout 7C is suppressed. Further, in the second embodiment, as in the first embodiment, since the direction E in which the cut-out 7C extends is not parallel to the absorption axis A, cracks 7cr in the cut-out 7C formation is likely to be suppressed.

As shown in FIG. 6 , a liquid crystal display device 30B according to the second embodiment includes a liquid crystal cell 10 and a polarizing plate 1Ba superimposed on one surface (first surface) of the liquid crystal cell 10 . (1st polarizing plate) and the other polarizing plate 1Bb (2nd polarizing plate) superimposed on the other surface (2nd surface) of the liquid crystal cell 10 are provided. Polarizing plates 1Ba and 1Bb shown in FIG. 6 are the same as that of polarizing plate 1B shown in FIG. 5 except that the release film 13 and the third protective film 3 are not provided. The polarizing plate 1Ba (first polarizing plate) is adhered to the first surface of the liquid crystal cell 10 through the adhesive layer 11 . The polarizing plate 1Ba (first polarizing plate) has an adhesive layer 11 superposed on the first surface of the liquid crystal cell 10 , a polarizer 7 superposed on the adhesive layer 11 , and a polarizer 7 superposed on the polarizer 7 . has a first protective film (5). Another polarizing plate 1Bb (second polarizing plate) is adhered to the second surface of the liquid crystal cell 10 via the adhesive layer 11 . Another polarizing plate 1Bb (second polarizing plate) includes an adhesive layer 11 superposed on the second surface of the liquid crystal cell 10 , a polarizer 7 superposed on the adhesive layer 11 , and a polarizer 7 . It has the 1st protective film 5 which overlaps. The liquid crystal cell 10 and a pair of polarizing plates 1Ba and 1Bb constitute a liquid crystal panel 20B. The liquid crystal panel 20B and the backlight (surface light source device) and other members constitute the liquid crystal display device 30B. The backlight and other members are omitted in FIG. 6 .

(Other embodiment)

As mentioned above, although 1st Embodiment and 2nd Embodiment of this invention were described, this invention is not limited to the said embodiment.

For example, a plurality of cutouts may be formed in the polarizing plate as long as the reference line L connecting the pair of corners positioned at both ends of each cutout is not perpendicular to the absorption axis A of the polarizer.

The shape of each of a polarizing plate and a cutout may be various according to a use. For example, as shown in Fig. 7(a), the width of the cut-out portion 7C in the direction parallel to the reference line L may be larger than the depth of the cut-out portion in the direction perpendicular to the reference line L. . As shown in Fig. 7(b), the shape of the cut-out portion 7C may be a semicircle. As shown in FIG.7(c), the shape of 7C of cutouts may be triangular. The shape of the cut-out portion 7C may be a polygon other than a square and a triangle. The shape of each of the polarizers 7 shown in FIGS. 7(a), 7(b) and 7(c) may be regarded as the shape of a polarizing plate provided with each of the polarizers 7 . In other words, the shape of the cutout portion 7C formed in each polarizer 7 shown in Figs. It may be regarded as the shape of the cutout.

As shown to Fig.8 (a), the outer edge (the 1st end part 7e and the 2nd end part 17e) of the polarizer 7 may be circular. As shown in FIG.8(b), the chamfered part 7C3 and the chamfered part 7C4 may be formed in the deep part (corner part) of 7C of cutouts. The corner portion 7C1 and the corner portion 7C2 located at both ends of the cutout portion 7C may also be chamfered. When the corner portions 7C1 and 7C2 located at both ends of the cut-out portion 7C are chamfered, the reference line L is a straight line in contact with the corner portion 7C1 and the corner portion 7C2. also good An outside corner portion CR1, an outer corner portion CR2, an outer corner portion CR3, and an outer corner portion CR4 located on the outer edge of the polarizer 7 may also be chamfered. The above-described chamfering is possible, for example, by cutting and grinding the notch and the outer edge used in the end mill. The shape of each of the polarizers 7 shown in FIGS. In other words, the shape of the cutout portion 7C formed in each polarizer 7 shown in Figs. It may be regarded as the shape of the cutout. As shown in FIG. 13, the chamfer 7C3 may be formed in the deep part (innermost part) of 7 C of triangular cutouts. The shape of the cutout 7C formed in the polarizer 7 shown in FIG. 13 may be regarded as the shape of the cutout formed in the polarizing plate provided with the polarizer 7 . As shown in FIG.8(b) and FIG.13, the crack in 7C of cutouts is easy to suppress because the deep part of 7C of cutouts is chamfered. The chamfered part 7C3 and the chamfered part 7C4 shown in FIG.8(b) may be changed to the curved-surface-shaped core part (corner part) of a cut-out part. The chamfered portion 7C3 shown in Fig. 13 may also be referred to as a curved core (corner portion) of the cut-out portion. The larger the radius of curvature of the curved core (corner portion) of the notch 7C is, the easier the crack in the notch 7C is to be suppressed. For example, when the radius of curvature of the curved core (corner portion) of the notch 7C is 0.07 mm or more, cracks in the notch 7C are easily suppressed. The radius of curvature of the curved core (corner) of the cutout C is, for example, 0.07 mm or more and 30 mm or less, or 0.07 mm or more and 10 mm or less, preferably 0.09 mm or more and 30 mm or less, or 0.09 mm or more 10 mm or less.

A part of the outer edge of a polarizer may be linear, and a curved shape may be sufficient as the remainder of the outer edge of a polarizer. A part of the first end of the polarizer may be linear, and the remainder of the first end of the polarizer may be curved. The first end of the polarizer may consist of only one or more straight lines (one or more sides). The 1st edge part of a polarizing plate may consist only of a curve. A part of the second end portion of the polarizer may be linear, and the remainder of the second end portion of the polarizer may be curved. The second end of the polarizer may consist of only one or more straight lines (one or more sides). The 2nd edge part of a polarizing plate may consist only of a curve. The shape of each of the polarizer and the polarizing plate may be a polygon other than a quadrangle. The shape of each of the polarizer and the polarizing plate may be, for example, an elliptical shape. The shape of each optical film 3 , 5 , 9 , 13 may be substantially the same as the shape of the polarizer 7 .

As shown in Fig. 9, the first end portion 7e in which the cut-out portion 7C is formed may not be parallel to the second end portion 17e. As shown in Fig. 9, when the first end 7e is not parallel to the second end 17e, and the core 7Cd (bottom) of the cut-out 7C is straight, the "cut-out ( The direction E in which 7C) extends" is a straight line that bisects the line segment S connecting the pair of corner portions 7C1 and 7C2 and bisects the straight core portion 7Cd of the cut-out portion 7C. It may be defined in a parallel direction. When the pair of corner portions 7C1 and 7C2 is chamfered, the line segment S may be a line segment that is in contact with both sides of the pair of corner portions 7C1 and 7C2. As shown in Fig. 10, when the first end 7e is not parallel to the second end 17e and the core 7Cd of the cut-out 7C is curved, "the cut-out 7C extends The "direction E" may be defined as a direction parallel to the straight line connecting the deep part 7Cd (the deepest part) of the notch 7C and the midpoint Sc of the line segment S. If the deep part 7Cd of the curved cutout 7C is divided into multiple parts, the "direction E in which the cutout 7C extends" is a plurality of deep parts (the deepest part) of the cutout 7C. It may be defined in a direction parallel to the straight line connecting each and the midpoint Sc of the line segment S. When the direction E corresponding to each of the plurality of deep portions (the deepest portions) of the notch 7C is not parallel to the absorption axis A, cracks in each of the deep portions are suppressed.

The type, number, and lamination order of the optical films constituting the polarizing plate are not limited. For example, the modified example of the polarizing plate which concerns on 2nd Embodiment may be equipped with the 3rd protective film 3, the polarizer 7, the 2nd protective film 9, the adhesion layer 11, and the release film 13. That is, not the 1st protective film 5 but the 3rd protective film 3 may be closely_contact|adhered to one surface of both surfaces of the polarizer 7 . The second protective film 9 may be closely adhered to the other surface of the polarizer 7 , and the release film 13 may be superposed on the second protective film 9 via the adhesive layer 11 . As mentioned above, the modification of the polarizing plate which concerns on 2nd Embodiment is not equipped with the 1st protective film 5, but is equipped with the 2nd protective film 9, The polarizing plate 1B which concerns on 2nd embodiment It is good even if it is different from

One piece may be sufficient as the number of sheets of the optical film with which a polarizing plate is equipped. For example, the modified example of 1 A of polarizing plate shown in FIG. 1 may not be equipped with both the 1st protective film 5 and the 2nd protective film 9. As shown in FIG. For example, either or both of the polarizing plate 1Aa (first polarizing plate) and polarizing plate 1b (second polarizing plate) shown in FIG. 4 are provided with the first protective film 5 and/or the second protective film 9 . no need to

The polarizing plate 1A does not need to be equipped with one or both of the 3rd protective film 3 and the release film 13. For example, the 3rd protective film 3 may peel and remove from 1 A of polarizing plates in the manufacturing process of an image display apparatus. That is, the 3rd protective film 3 may be a virtual protective film. The release film 13 may also peel and be removed from 1 A of polarizing plates in the manufacturing process of an image display apparatus.

Instead of the first protective film 5 or the second protective film 9, a thinner protective layer may be directly superimposed on the polarizer. For example, when a coating film containing an active energy ray-curable resin is formed on the surface of a polarizer and the coating film is cured by irradiation with an active energy ray, a protective layer thinner than a conventional protective film is directly formed on the surface of the polarizer. In other words, you may form a thin protective layer by the active energy ray-curable resin itself used for adhesion|attachment of a polarizer and a protective film.

A release film may be arrange|positioned on both surfaces of a polarizing plate through an adhesion layer.

The optical film provided with the polarizing plate is a reflective polarizing film, a film having an anti-glare function, a film having a surface anti-reflection function, a reflective film, a transflective reflective film, a viewing angle compensation film, an optical compensation layer, a touch sensor layer, an antistatic layer, or An antifouling layer is also good.

The polarizing plate may further include a hard coat layer. For example, in the modified example of the polarizing plate 1A shown in FIG. 1, the 1st protective film 5 may be located between the hard-coat layer and the polarizer 7, and a hard-coat layer is 1st protective film 5 and It may be located between the 3rd protective films 3 . In this case, the 1st protective film 5 may contain triacetyl cellulose.

A hard-coat layer is a layer comprised from the acrylic resin film in which the fine uneven|corrugated shape was formed in the surface, for example. The hard coat layer may be formed of, for example, a coating film containing organic fine particles or inorganic fine particles. You may use the method (for example, embossing method etc.) which presses this coating film to the roll which has an uneven shape. After forming a coating film containing no organic fine particles or inorganic fine particles, a method of pressing the coating film against a roll having an uneven shape may be used. The inorganic fine particles may be, for example, silica, colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate, or the like. The organic fine particles (resin particles) may be, for example, crosslinked polyacrylic acid particles, methyl methacrylate/styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, silicone resin particles, polyimide particles, or the like. The binder component for dispersing the inorganic microparticles or organic microparticles|fine-particles should just be selected from the material used as high hardness (hard coat). The binder component may be, for example, an ultraviolet curable resin, a thermosetting resin, or an electron beam curable resin. From viewpoints of productivity, hardness, etc., an ultraviolet curable resin is used preferably as a binder component. The thickness of the hard coat layer may be, for example, 2 µm or more and 30 µm or less, or 3 µm or more and 30 µm or less.

[ Example ]

Hereinafter, the present invention will be described in more detail by way of Examples, but the present invention is not limited to these Examples.

(Example 1)

The rectangular 1st laminated body comprised with the polarizer film (polarizer 7 before cutting), the optical films 3, 5, 9, 13 of 4 sheets, and the pressure-sensitive adhesive layer 11 was produced. The first laminate includes a release film 13 , an adhesive layer 11 superposed on the release film 13 , a second protective film 9 superposed on the adhesive layer 11 , and a second protective film ( The polarizer film 7 superimposed on 9), the 1st protective film 5 superimposed on the polarizer film 7, and the 3rd protective film 3 superimposed on the 1st protective film 5 were provided. . As the polarizer film 7, stretched and dyed film-type polyvinyl alcohol was used. As the first protective film 5, a triacetyl cellulose (TAC) film was used. As the 2nd protective film 9, the film comprised from cyclic olefin polymer type resin (COP type resin) was used. As the 3rd protective film 3, the PET protection film was used. As the release film 13, a PET separator was used. The thickness of the release film 13 was 38 m. The thickness of the adhesive layer 11 was 20 m. The thickness of the 2nd protective film 9 was 13 micrometers. The thickness of the polarizer 7 was 7 m. The thickness of the 1st protective film 5 was 25 micrometers. The thickness of the 3rd protective film 3 was 58 micrometers.

The above-described first laminate was cut with a cutter to prepare a second laminate having a horizontal side length of 170 mm and a vertical side length of 100 mm. When cutting the first laminate, by adjusting the cutting direction of the first laminate, the horizontal side (first end) of the second laminate and the absorption axis A of the polarizer 7 make an angle ( θ ), It adjusted to the angle shown in Table 1 below. Moreover, the absorption axis line A of the polarizer 7 was parallel to the extending|stretching direction of the polarizer film 7 .

The second laminate was adsorbed to the stage and fixed. By irradiating the outer edge of the fixed second laminate with a CO ₂ laser, a concave notch was formed on the transverse side (first end) of the second laminate. The polarizing plate of Example 1 was obtained through the above process. The output of the CO ₂ laser was set to 20 W. The oscillation wavelength of the CO ₂ laser was 10.4 μm.

The shape of the obtained polarizing plate was the same as that of the polarizer 7 shown in FIG.8(c). That is, the polarizer 7 shown in FIG. 8(c) is a polarizer provided with the polarizing plate manufactured in the above-described procedure. The shape of the cutout 7C formed in the first end 7e (the transverse side of the second laminate) of the polarizer 7 was almost a semicircle. When the reference line L is defined as a straight line connecting the corner portions 7C1 and 7C2 positioned at both ends of the cut-out portion 7C, the angle between the reference line L and the absorption axis A is It was equal to one angle ( θ ). The width Wc of the cutout 7C in the direction parallel to the reference line L was 20 mm. That is, the distance between the corner portion 7C1 and the corner portion 7C2 was 20 mm. The depth of the cutout 7C in the direction perpendicular to the reference line L was 10 mm. The width W of the first end 7e of the polarizer 7 in which the cutout 7C was formed was 150 mm. That is, the length of the horizontal side of the polarizing plate (the horizontal width W of the polarizing plate) was 150 mm. The length of the longitudinal side of the polarizing plate (vertical width of the polarizing plate) was 80 mm. Wc/W was 20 mm/150 mm, ie 0.13.

The release film 13 was peeled from the adhesion layer 11 of a polarizing plate, and the polarizing plate was bonded to the glass plate through the adhesion layer 11. Moreover, the 3rd protective film 3 was peeled from the polarizing plate. By such a procedure, the sample which consists of a glass plate and the polarizing plate joined to the glass plate was prepared. A heat cycle test was performed using this sample. In the heat cycle test, a cycle consisting of the following Step 1 and Step 2 following Step 1 was repeated.

Step 1: Heating the sample in an atmosphere of 85° C. for 30 minutes.

Step 2: Cooling the sample in an atmosphere of -40°C for 30 minutes.

At each time point in which the cycle described above was repeated a predetermined number of times shown in Table 1, the notch 7C formed in the polarizer 7 included in the sample was observed with an optical microscope.

(Examples 2 to 8, Comparative Example 1)

In the same manner as in Example 1, except that the angle θ between the horizontal side (first end) of the second laminate and the absorption axis A of the polarizer 7 was adjusted to the angle shown in Table 1 below. , Examples 2 to 8 and Comparative Example 1 Each polarizing plate was produced individually. That is, in the production of each of the polarizing plates of Examples 2 to 8 and Comparative Example 1, the angle θ between the reference line L and the absorption axis A was adjusted to the angle shown in Table 1 below. Similar to the case of Example 1, the heat cycle test using each polarizing plate of Examples 2-8 and Comparative Example 1 was done.

The results of each heat cycle test in Examples 1 to 8 and Comparative Example 1 are shown in Table 1 below. "A" in the table means that there was no crack in the cutout 7C of the polarizer 7 . "B" means that minute cracks were formed in the cutout 7C of the polarizer 7 . "C" means that the crack larger than the case of "B" was formed in 7C of cutouts of the polarizer 7. "B" described in the row of Comparative Example 1 means that a crack having a length of about 1 mm was formed. "B" described in the row of Example 1 means that a crack having a length of about 10 mm was formed.

(Examples 9, 10, Comparative Example 2)

Polarizing plates of Examples 9, 10 and Comparative Example 2 were individually produced in the same manner as in Example 1, except that the shape and angle θ of the cut-out portion 7C were changed.

The shape of each polarizer of Examples 9, 10 and Comparative Example 2 was the same as that of the polarizer 7 shown in FIG. 13 . That is, in the case of Examples 9 and 10 and Comparative Example 2, the shape of the cutout 7C formed in the first end 7e (the horizontal side of the second laminate) of the polarizer 7 was substantially triangular. The shape of each polarizing plate of Examples 9, 10 and Comparative Example 2 was the same as that of the polarizer 7 shown in FIG. 13 . In the case of Examples 9 and 10 and Comparative Example 2, the angle ( θ ) was adjusted to the value shown in Table 2 below.

In the case of Examples 9 and 10 and Comparative Example 2, the width Wc of the cut-out portion 7C in the direction parallel to the reference line L was 20 mm. That is, the distance between the corner portion 7C1 and the corner portion 7C2 was 20 mm. In the case of Examples 9 and 10 and Comparative Example 2, the length Dc (depth) of the cutout 7C in the direction perpendicular to the reference line L was 10 mm. In the case of Examples 9 and 10 and Comparative Example 2, the chamfered portion 7C3 was formed in the deep portion (corner portion) of the notch 7C. The radius of curvature of the chamfer 7C3 of the cut-out 7C was 0.1 mm. In Examples 9 and 10 and Comparative Example 2, the width W of the first end 7e of the polarizer 7 in which the cutout 7C was formed was 150 mm. That is, the length of the horizontal side of the polarizing plate (the horizontal width W of the polarizing plate) was 150 mm. In Examples 9 and 10 and Comparative Example 2, the length of the longitudinal side of the polarizing plate (vertical width of the polarizing plate) was 80 mm. Wc/W was 20 mm/150 mm, ie 0.13.

Like the case of Example 1, the heat cycle test using each polarizing plate of Examples 9, 10, and Comparative Example 2 was done. The results of each heat cycle test of Examples 9, 10 and Comparative Example 2 are shown in Table 2 below.

(Examples 11-17)

In preparation of each polarizing plate of Examples 11-17, angle ( theta ) was adjusted to 45 degrees.

The shape of each polarizer of Examples 11-17 was the same as that of the polarizer 7 shown in FIG. That is, in the case of Examples 11-17, the shape of the cutout part 7C formed in the 1st edge part 7e (the horizontal side of a 2nd laminated body) of the polarizer 7 was substantially triangular. The shape of each polarizing plate of Examples 11-17 was the same as that of the polarizer 7 shown in FIG.

In the case of Examples 11-17, the width W of the 1st edge part 7e of the polarizer 7 with 7 C of cutouts was adjusted to the value shown in following Table 3. The width W can be changed to the length of the horizontal side of the polarizing plate (the horizontal width of the polarizing plate).

In the case of Examples 11-17, the width Wc of the cut-out part 7C in the direction parallel to the reference line L was 20 mm. That is, the distance between the corner portion 7C1 and the corner portion 7C2 was 20 mm. In the case of Examples 11 to 17, Wc/W was a value shown in Table 3 below. In the case of Examples 11-17, the length Dc (depth) of the notch 7C in the direction perpendicular|vertical to the reference line L was 10 mm. In the case of Examples 11-17, the chamfer 7C3 was formed in the deep part (corner part) of 7C of cutouts. The radius of curvature of the chamfer 7C3 of the cut-out 7C was 0.1 mm. In the case of Examples 11-17, the length of the longitudinal side of a polarizing plate (vertical width of a polarizing plate) was 70 mm.

Except for the above, each polarizing plate of Examples 11 to 17 was individually produced in the same manner as in Example 1.

Similar to the case of Example 1, the heat cycle test using each polarizing plate of Examples 11-17 was done. In each heat cycle test of Examples 11-17, one surface of the polarizer 7 is covered with the 2nd protective film 9 (film comprised from COP-type resin), and the other surface of the polarizer 7 was covered with the 1st protective film 5 (TAC film). The results of each heat cycle test of Examples 11 to 17 are shown in Table 3 below.

(Examples 18-20)

In preparation of the 1st laminated body of Examples 18-20, the 3rd protective film 3 (PET protection film) was directly superimposed on the polarizer 7 without using the 1st protective film 5 (TAC film). .

In preparation of each polarizing plate of Examples 18-20, angle ( theta ) was adjusted to 45 degrees.

The shape of each polarizer of Examples 18-20 was the same as that of the polarizer 7 shown in FIG. That is, in the case of Examples 18-20, the shape of the cutout part 7C formed in the 1st end part 7e (the horizontal side of a 2nd laminated body) of the polarizer 7 was substantially triangular. The shape of each polarizing plate of Examples 18-20 was the same as that of the polarizer 7 shown in FIG.

In the case of Examples 18-20, the width W of the 1st edge part 7e of the polarizer 7 with 7 C of cutouts was adjusted to the value shown in following Table 3. The width W can be changed to the length of the horizontal side of the polarizing plate (the horizontal width of the polarizing plate).

In the case of Examples 18 to 20, the width Wc of the cut-out portion 7C in the direction parallel to the reference line L was 20 mm. That is, the distance between the corner portion 7C1 and the corner portion 7C2 was 20 mm. In the case of Examples 18 to 20, Wc/W was a value shown in Table 3 below. In the case of Examples 18 to 20, the length Dc (depth) of the cutout 7C in the direction perpendicular to the reference line L was 10 mm. In the case of Examples 18-20, the chamfer 7C3 was formed in the deep part (corner part) of 7C of cutouts. The radius of curvature of the chamfer 7C3 of the cut-out 7C was 0.1 mm. In the case of Examples 18-20, the length of the longitudinal side of a polarizing plate (vertical width of a polarizing plate) was 70 mm.

Except for the above, each polarizing plate of Examples 18 to 20 was individually produced in the same manner as in Example 1.

Similar to the case of Example 1, the heat cycle test using each polarizing plate of Examples 18-20 was done. As mentioned above, each polarizing plate of Examples 18-20 was not equipped with the 1st protective film 5 (TAC film). Therefore, in each heat cycle test of Examples 18-20, although the surface of one side of the polarizer 7 was covered with the 2nd protective film 9 (film comprised from COP-type resin), the other side of the polarizer 7 The surface of was exposed without being covered with the 1st protective film 5 (TAC film). The results of each heat cycle test in Examples 18 to 20 are shown in Table 3 below.

(Examples 21 to 23, Comparative Example 3)

In the production of each of Examples 21 to 23 and Comparative Example 3 polarizing plate, angle ( θ ) was adjusted to 45°.

The shape of each of the polarizers of Examples 21 to 23 and Comparative Example 3 is shown in FIG. 3 except that the width W of the entire polarizer 7 is longer than the vertical width D of the entire polarizer 7 It was the same as the shape of the polarizer 7 .

The width W of the whole polarizer 7 may be said to be the width|variety of the whole polarizer 7 in the direction parallel to the reference line L. The width W of the whole polarizer 7 may be said to be the width|variety of the whole polarizer 7 in the direction parallel to the 1st edge part 7e. In any case of Examples 21-23 and Comparative Example 3, the width W of the whole polarizer 7 in the direction parallel to the reference line L was 170 mm. The vertical width D of the whole polarizer 7 can be said in other words to the width of the whole polarizer 7 in the direction perpendicular to the reference line L. In any case of Examples 21-23 and Comparative Example 3, the width D of the entire polarizer 7 in the direction perpendicular to the reference line L was 100 mm.

As shown in Fig. 3, in any of Examples 21 to 23 and Comparative Example 3, the shape of the cutout 7C formed in the first end 7e (the horizontal side of the second laminate) of the polarizer 7 was a rectangle. In Examples 21 to 23 and Comparative Example 3, the width Wc of the cutout 7C in the direction parallel to the reference line L was a value shown in Table 4 below. In Examples 21 to 23 and Comparative Example 3, Wc/W was a value shown in Table 4 below. In any case of Examples 21-23 and Comparative Example 3, the length Dc (depth) of the cutout 7C in the direction perpendicular to the reference line L was 5 mm.

In the same manner as in Example 1 except for the above, each of Examples 21 to 23 and Comparative Example 3 was individually produced.

Similar to the case of Example 1, the heat cycle test using each polarizing plate of Examples 21-23 and Comparative Example 3 was done. In each heat cycle test of Examples 21-23 and Comparative Example 3, one surface of the polarizer 7 is covered with the second protective film 9 (film composed of COP-based resin), and the polarizer 7 The surface of the other side of was covered with the 1st protective film 5 (TAC film). The results of each heat cycle test of Examples 21 to 23 and Comparative Example 3 are shown in Table 4 below.

The polarizing plate according to the present invention is adhered to, for example, a liquid crystal cell or an organic EL device, and is applied as an optical component constituting an image display apparatus such as a liquid crystal television, an organic EL television, or a smartphone.

1A, 1Aa, 1Ab, 1B, 1Ba, 1Bb, 1C: Polarizing plate;
3: a third protective film;
5: first protective film;
7: Polarizer,
7C: cutout;
7C1, 7C2: a pair of corner portions located at both ends of the cut-out portion 7C;
7e: end (first end) of the polarizer;
7cr: crack,
9: a second protective film;
7Cd: the deep part of the cut-out (7C);
10: liquid crystal cell;
11: adhesive layer,
13: release film;
17e: the second end of the polarizer;
20A, 20B: liquid crystal panel;
30A, 30B: liquid crystal display device (image display device);
L: baseline,
A: absorption axis,
E: the direction in which the cut-out portion 7C extends;
S: a line segment connecting a pair of corner parts (7C1, 7C2);
Sc: midpoint of the line segment (S),
θ : the angle between the reference line (L) and the absorption axis (A),
α: The angle formed by the direction (E) in which the cutout portion (C) extends and the absorption axis (A) of the polarizer.

Claims (27)

A film-type polarizer is provided,
A concave cutout is formed at the end of the polarizer,
The polarizer has a rectangular shape, and the cutout is formed on only one side of the quadrilateral of the polarizer,
When the reference line (L) is defined as a straight line connecting a pair of corner portions located at both ends of the cut-out portion,
The reference line (L) is not perpendicular to the absorption axis (A) of the polarizer,
Wc is the width of the cutout in a direction parallel to the reference line L;
W is the width of the entire polarizer in a direction parallel to the reference line L,
Wc/W is 0.10 or more and 0.45 or less,
The angle ( θ ) between the reference line (L) and the absorption axis (A) is 0° or more and 60° or less,
A depth (Dc) of the cutout in a direction perpendicular to the reference line (L) is 1 mm or more and 10 mm or less,
A length (D) of the entire polarizer in a direction perpendicular to the reference line (L) is 100 mm or more and 600 mm or less,
A polarizing plate having a thickness of the polarizer of 1 μm or more and 10 μm or less. A film-type polarizer is provided,
A concave cutout is formed at the end of the polarizer,
The polarizer has a rectangular shape, and the cutout is formed on only one side of the quadrilateral of the polarizer,
When the reference line (L) is defined as a straight line connecting a pair of corner portions located at both ends of the cut-out portion,
The reference line (L) is not perpendicular to the absorption axis (A) of the polarizer,
Wc is the width of the cutout in a direction parallel to the reference line L;
W is the width of the entire polarizer in a direction parallel to the reference line L,
Wc/W is 0.10 or more and 0.45 or less,
The angle ( θ ) between the reference line (L) and the absorption axis (A) is 0° or more and 60° or less,
A depth (Dc) of the cutout in a direction perpendicular to the reference line (L) is 1 mm or more and 10 mm or less,
A length (D) of the entire polarizer in a direction perpendicular to the reference line (L) is 100 mm or more and 600 mm or less,
A protective film or protective layer is in close contact with both surfaces of the polarizer,
The polarizing plate of which the said protective film or the said protective layer closely_contact|adhered to the one surface of the said polarizer contains triacetyl cellulose or a cyclic olefin polymer type resin. The method according to claim 2, wherein the protective film or the protective layer in close contact with one surface of the polarizer contains triacetyl cellulose,
The polarizing plate that the said protective film or the said protective layer closely_contact|adhered to the other surface of the said polarizer contains a cyclic olefin polymer type resin. A film-type polarizer is provided,
A concave cutout is formed at the end of the polarizer,
The polarizer has a rectangular shape, and the cutout is formed on only one side of the quadrilateral of the polarizer,
When the reference line (L) is defined as a straight line connecting a pair of corner portions located at both ends of the cut-out portion,
The reference line (L) is not perpendicular to the absorption axis (A) of the polarizer,
Wc is the width of the cutout in a direction parallel to the reference line L;
W is the width of the entire polarizer in a direction parallel to the reference line L,
Wc/W is 0.10 or more and 0.45 or less,
The angle ( θ ) between the reference line (L) and the absorption axis (A) is 0° or more and 60° or less,
A depth (Dc) of the cutout in a direction perpendicular to the reference line (L) is 1 mm or more and 10 mm or less,
A length (D) of the entire polarizer in a direction perpendicular to the reference line (L) is 100 mm or more and 600 mm or less,
A protective film or protective layer is in close contact with only one surface of both surfaces of the polarizer,
The polarizing plate wherein the protective film or the protective layer comprises triacetyl cellulose or a cyclic olefin polymer-based resin. The polarizing plate according to claim 4, wherein the adhesive layer is in close contact with the other surface of the polarizer. A film-type polarizer is provided,
A concave cutout is formed at the end of the polarizer,
The polarizer has a rectangular shape, and the cutout is formed on only one side of the quadrilateral of the polarizer,
When the reference line (L) is defined as a straight line connecting a pair of corner portions located at both ends of the cut-out portion,
The reference line (L) is not perpendicular to the absorption axis (A) of the polarizer,
Wc is the width of the cutout in a direction parallel to the reference line L;
W is the width of the entire polarizer in a direction parallel to the reference line L,
Wc/W is 0.10 or more and 0.45 or less,
The angle ( θ ) between the reference line (L) and the absorption axis (A) is 0° or more and 60° or less,
A depth (Dc) of the cutout in a direction perpendicular to the reference line (L) is 1 mm or more and 10 mm or less,
A length (D) of the entire polarizer in a direction perpendicular to the reference line (L) is 100 mm or more and 600 mm or less,
A protective film or protective layer is in close contact with one surface of the polarizer,
A polarizing plate in which an adhesive layer is in close contact with the other surface of the polarizer. The polarizing plate according to any one of claims 2 to 6, wherein the polarizer has a thickness of 1 µm or more and 10 µm or less. 7. The method of any one of claims 1 to 6, wherein the polarizer has a first end and a second end located opposite the first end,
The cut-out portion is formed at the first end,
The cut-out portion extends from the first end toward the second end,
A polarizing plate in which the direction (E) in which the cutouts extend is not parallel to the absorption axis (A) of the polarizer. The polarizing plate according to any one of claims 1 to 6, wherein the angle ( θ ) between the reference line (L) and the absorption axis (A) is 0° or more and 30° or less. The method according to any one of claims 1 to 6, wherein in the upper surface of the polarizer, the core of the cut-out is straight,
A polarizing plate in which the deep part of the cut-out is parallel to the reference line (L). The polarizing plate according to any one of claims 1 to 6, wherein the shape of the cut-out portion is a quadrangle. The polarizing plate according to any one of claims 1 to 6, wherein the core of the cutout is chamfered. The polarizing plate according to any one of claims 1 to 6, wherein the polarizer is exposed in the cutout. The polarizing plate in any one of Claims 1-6 used for an image display apparatus. The image display apparatus containing the polarizing plate in any one of Claims 1-6. As a method of manufacturing the polarizing plate according to any one of claims 1 to 6,
A step of producing a first laminate including a polarizer film and at least one optical film superposed on the polarizer film;
processing the first laminate to produce a second laminate having a first end that is not orthogonal to the absorption axis A of the polarizer film;
A step of forming a concave cutout in the first end
and, when the reference line (L) is defined as a straight line connecting a pair of corner portions located at both ends of the cut-out portion,
Wc is the width of the cutout in a direction parallel to the reference line L;
W is the width of the entire polarizer film in a direction parallel to the reference line L;
The manufacturing method of the polarizing plate which adjusts Wc/W to 0.10 or more and 0.45 or less. 17. The method of claim 16, wherein the second laminate has a second end opposite the first end;
The cut-out portion extends from the first end toward the second end, and a direction (E) in which the cut-out portion extends is adjusted in a direction not parallel to the absorption axis line (A), a method of manufacturing a polarizing plate . delete delete delete delete delete delete delete delete delete delete

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