JP6861140B2 - Method for manufacturing polarizing plate, image display device and polarizing plate - Google Patents

Description

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

The polarizing plate is one of the optical components constituting an image display device such as a liquid crystal television, an organic EL television, or a smartphone. The polarizing plate includes a film-shaped polarizing element and an optical film (for example, a protective film) that overlaps the polarizing element. Due to the design of the image display device, a cut-out portion may be formed at the end of the polarizer. For example, Patent Document 1 below describes that a notch is formed at an end of a polarizer as an injection port for a liquid crystal.

Japanese Unexamined Patent Publication No. 2000-155325

The polarizer expands or contracts as the temperature changes. As a result of the research by the present inventors, it has been found that cracks are formed in the notch due to the contraction of the polarizer due to the temperature change. In particular, cracks are likely to be formed due to thermal shock (rapid temperature change).

The present invention has been made in view of the above circumstances, and is a polarizing plate capable of suppressing cracks caused by a temperature change in a notched portion of a polarizing element, an image display device including the polarizing plate, and a polarizing plate. It is an object of the present invention to provide the manufacturing method of.

The polarizing plate according to one aspect of the present invention includes a film-shaped polarizer, concave notches are formed at the ends of the polarizer, and reference lines L are located at both ends of the notches. When defined as a straight line connecting a pair of corners, the reference line L is not orthogonal to the absorber's absorption axis A, Wc is the width of the notch in the direction parallel to the reference line L, and W is. It is the width of the entire polarizer in the direction parallel to the reference line L, and Wc / W is 0.05 or more and less than 1.0. In other words, the angle θ formed by the reference line L with the absorption axis A of the polarizer is 0 ° or more and less than 90 °. The angle θ formed by the reference line L with the absorption axis A may be 0 ° or more and 30 ° or less.

In one aspect of the invention, the polarizer may have a first end and a second end located on the opposite side of the first end, with a notch at the first end. It may be formed, the notch may extend from the first end to the second end, and the direction E in which the notch extends does not have to be parallel to the absorption axis A of the polarizer. In other words, the angle α formed by the direction E in which the notch extends extends with the absorption axis A of the polarizer may be larger than 0 ° and 90 ° or less.

The method for producing a polarizing plate according to one aspect of the present invention includes a step of producing a first laminated body including a polarizing element film and at least one optical film overlapping the polarizing element film, and processing the first laminated body. A step of forming a second laminated body having a first end portion not orthogonal to the absorption axis A of the polarizing element film, and a step of forming a concave notch in the first end portion of the second laminated body. When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch, Wc is the width of the notch in a direction parallel to the reference line L, and W Is the width of the entire polarizing film in the direction parallel to the reference line L, and Wc / W is adjusted to 0.05 or more and less than 1.0. The angle formed by the first end of the second laminated body with the absorption axis A may be adjusted to 0 ° or more and 30 ° or less.

In the method for manufacturing a polarizing plate according to one aspect of the present invention, the second laminated body may have a second end portion located on the opposite side of the first end portion, and a notch portion may be formed from the first end portion. The direction E may be extended toward the second end portion and the notch portion may be extended in a direction not parallel to the absorption axis A. In other words, the angle α formed by the direction E in which the notch extends extends with the absorption axis A of the polarizer film (polarizer) may be adjusted to be greater than 0 ° and 90 ° or less.

The polarizing plate according to another aspect of the present invention includes a film-shaped polarizing element, and the polarizing element has a first end portion and a second end portion located on the opposite side of the first end portion. A concave notch is formed at the first end, the notch extends from the first end toward the second end, and the direction E in which the notch extends is the polarizer. Wc is the width of the notch in the direction parallel to the first end, and W is the width of the entire polarizer in the direction parallel to the first end. / W is 0.05 or more and less than 1.0. In other words, in the polarizing plate according to the other aspect of the present invention, the angle α formed by the direction E in which the notch extends with the absorption axis A of the polarizer is larger than 0 ° and 90 ° or less.

The method for producing a polarizing plate according to another aspect of the present invention includes a step of producing a first laminated body including a polarizing element film and at least one optical film overlapping the polarizing element film, and processing the first laminated body. Then, a step of producing a second laminated body having a first end portion and a second end portion located on the opposite side of the first end portion, and a step of forming a concave notch portion in the first end portion. The notch is extended from the first end to the second end, and the direction E in which the notch extends is adjusted in a direction not parallel to the absorption axis A. The width of the notch in the direction parallel to the end, W is the width of the entire polarizing film in the direction parallel to the first end, and Wc / W is adjusted to 0.05 or more and less than 1.0. To do. In other words, the angle α formed by the direction E in which the notch extends is the absorption axis A of the polarizing film (polarizer) is adjusted to be greater than 0 ° and 90 ° or less. The angle formed by the first end of the second laminated body with the absorption axis A may be adjusted to 0 ° or more and 30 ° or less.

In any of the above aspects of the present invention, a protective film or a protective layer may be in close contact with both surfaces of the polarizer.

In any of the above aspects of the present invention, the protective film or protective layer may be in close contact with only one of the two surfaces of the polarizer. In any of the above aspects of the invention, the deep portion of the notch may be chamfered.

The image display device according to any one of the above aspects of the present invention includes the above polarizing plate.
The polarizing plate according to the first aspect of the present invention includes a film-shaped polarizing element, concave notches are formed at the ends of the polarizer, and reference lines L are located at both ends of the notches. When defined as a straight line connecting a pair of corners, the reference line L is not orthogonal to the absorber's absorption axis A, Wc is the width of the notch in the direction parallel to the reference line L, and W is. The width of the entire polarizer in the direction parallel to the reference line L, Wc / W is 0.05 or more and less than 1.0, and the thickness of the polarizer is 1 μm or more and 10 μm or less.
The polarizing plate according to the second side surface of the present invention is provided with a film-shaped polarizer, concave notches are formed at the ends of the polarizer, and reference lines L are located at both ends of the notches. When defined as a straight line connecting a pair of corners, the reference line L is not orthogonal to the absorber's absorption axis A, Wc is the width of the notch in the direction parallel to the reference line L, and W is. , The width of the entire polarizing element in the direction parallel to the reference line L, Wc / W is 0.05 or more and less than 1.0, and a protective film or a protective layer is in close contact with both surfaces of the polarizing element. The protective film or layer that adheres to one surface of the child contains triacetyl cellulose or a cyclic olefin polymer resin.
In the second aspect of the present invention, the protective film or protective layer that adheres to one surface of the polarizer may contain triacetyl cellulose, and the protective film or protective layer that adheres to the other surface of the polarizer is cyclic. An olefin polymer-based resin may be included.
The polarizing plate according to the third side surface of the present invention is provided with a film-shaped polarizer, concave notches are formed at the ends of the polarizer, and reference lines L are located at both ends of the notches. When defined as a straight line connecting a pair of corners, the reference line L is not orthogonal to the absorber's absorption axis A, Wc is the width of the notch in the direction parallel to the reference line L, and W is. , The width of the entire polarizer in the direction parallel to the reference line L, Wc / W is 0.05 or more and less than 1.0, and a protective film or protective layer is applied only to one of both surfaces of the polarizer. The protective film or protective layer contains triacetyl cellulose or a cyclic olefin polymer resin.
In the third aspect of the present invention, the adhesive layer may be in close contact with the other surface of the polarizer.
The polarizing plate according to the fourth side surface of the present invention is provided with a film-shaped polarizer, concave notches are formed at the ends of the polarizer, and reference lines L are located at both ends of the notches. When defined as a straight line connecting a pair of corners, the reference line L is not orthogonal to the absorber's absorption axis A, Wc is the width of the notch in the direction parallel to the reference line L, and W is. , The width of the entire polarizer in the direction parallel to the reference line L, Wc / W is 0.05 or more and less than 1.0, and a protective film or a protective layer is in close contact with one surface of the polarizer. , The adhesive layer is in close contact with the other surface of the polarizer.
In the second to fourth aspects of the present invention, the thickness of the polarizer may be 1 μm or more and 10 μm or less.
In the first to fourth aspects of the present invention, the polarizer may have a first end portion and a second end portion located on the opposite side of the first end portion, and the notch portion is the first. It may be formed at the end, the notch may extend from the first end to the second end, and the direction E in which the notch extends is not parallel to the absorber's absorption axis A. It's okay.
In the first to fourth aspects of the present invention, the angle θ formed by the reference line L with the absorption axis A may be 0 ° or more and 60 ° or less.
In the first to fourth aspects of the present invention, the angle θ formed by the reference line L with the absorption axis A may be 0 ° or more and 30 ° or less.
In the first to fourth side surfaces of the present invention, the deep portion of the notch portion may be linear on the upper surface of the polarizer, and the deep portion of the notch portion may be parallel to the reference line L.
In the first to fourth side surfaces of the present invention, the shape of the notch may be quadrangular.
In the first to fourth aspects of the present invention, the deep portion of the notch may be chamfered.
In the first to fourth aspects of the present invention, the polarizer may be exposed at the notch.
In the first to fourth aspects of the present invention, Wc / W may be 0.05 or more and 0.78 or less.
In the first to fourth aspects of the present invention, the polarizer may be rectangular, and a notch may be formed on only one of the four sides of the polarizer.
In the first to fourth side surfaces of the present invention, the depth Dc of the notch portion in the direction perpendicular to the reference line L may be 1 mm or more and 30 mm or less, and the length of the entire polarizer in the direction perpendicular to the reference line L. The D may be 70 mm or more and 600 mm or less.
The polarizing plate according to the first to fourth aspects of the present invention may be used in an image display device.
The image display device according to one aspect of the present invention may include the above-mentioned polarizing plate.
The method for producing a polarizing plate according to one aspect of the present invention is the method for producing the above-mentioned polarizing plate, which comprises a first laminated body including a polarizing element film and at least one optical film overlapping the polarizing element film. The step of producing, the step of processing the first laminate to produce a second laminate having a first end portion not orthogonal to the absorption axis A of the polarizing element film, and the step of producing a concave notch portion at the first end. When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch, Wc is the notch in a direction parallel to the reference line L. W is the width of the entire polarizing film in the direction parallel to the reference line L, and Wc / W is adjusted to 0.05 or more and less than 1.0.
In the method for manufacturing a polarizing plate according to one aspect of the present invention, the second laminated body may have a second end portion located on the opposite side of the first end portion, and a notch portion may be formed from the first end portion. The direction E extending toward the second end and extending the notch may be adjusted in a direction not parallel to the absorption axis A.

According to the present invention, there is provided a polarizing plate capable of suppressing cracks caused by a temperature change in a notch portion of a polarizing element, an image display device including the polarizing plate, and a method for manufacturing the polarizing plate.

It is a schematic perspective view of the polarizing plate which concerns on 1st Embodiment of this invention. FIG. 2A is a top view of the polarizer included in the polarizing plate shown in FIG. 1, and FIG. 2B is a top view of the polarizing element shown in FIG. 2A. This is a modified example. It is a top view of the polarizer included in the polarizing plate shown in FIG. 1, and is an enlarged view of (a) in FIG. It is a schematic diagram of the cross section of the image display device (liquid crystal display device) which concerns on the 1st Embodiment of this invention. It is a schematic perspective view of the polarizing plate which concerns on 2nd Embodiment of this invention. It is a schematic diagram of the cross section of the image display device (liquid crystal display device) which concerns on the 2nd Embodiment of this invention. FIG. 7A is a top view of a polarizing plate included in a polarizing plate according to another embodiment of the present invention, and FIG. 7B is a top view of a polarizing plate according to another embodiment of the present invention. It is a top view of the polarizer provided in FIG. 7, and (c) in FIG. 7 is a top view of the polarizing element included in the polarizing plate according to another embodiment of the present invention. FIG. 8A is a top view of a polarizing plate included in a polarizing plate according to another embodiment of the present invention, and FIG. 8B is a top view of a polarizing plate according to another embodiment of the present invention. It is a top view of the polarizer provided in FIG. 8, and (c) in FIG. 8 is a top view of the polarizing element included in the polarizing plate according to the embodiment of the present invention. It is a top view of the polarizer included in the polarizing plate according to another embodiment of the present invention. It is a top view of the polarizer included in the polarizing plate according to another embodiment of the present invention. It is a schematic perspective view of the polarizing plate which concerns on the comparative example of this invention. It is a top view of the polarizer included in the polarizing plate shown in FIG. It is a top view of the polarizer provided in the polarizing plate which concerns on a part of Examples of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, equivalent components are designated by the same reference numerals. The present invention is not limited to the following embodiments. X, Y and Z shown in each figure mean three coordinate axes orthogonal to each other. The direction indicated by each coordinate axis is common to all drawings.

(First Embodiment)
The first embodiment will be described with reference to FIGS. 1 and 2, FIG. 2 (a), FIG. 2 (b), and FIG. The polarizing plate 1A according to the first embodiment includes a film-shaped polarizing element 7 and a plurality of optical films (3, 5, 9, 13) overlapping the polarizing element 7. Both the polarizer 7 and the plurality of optical films (3, 5, 9, 13) are quadrangular. The “optical film” means a film-like member (excluding the polarizer itself) that constitutes a polarizing plate. The optical film may be paraphrased as a layer or an optical layer. Optical films include, for example, protective films and release films. In the first embodiment, the plurality of optical films (3, 5, 9, 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, the polarizing plate 1A includes a polarizing element 7, a first protective film 5, a second protective film 9, a third protective film 3, and a release film 13. The polarizing plate 1A also includes an adhesive layer 11 located 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 films (protective layers) are in close contact with both surfaces of the polarizer 7. The third protective film 3 overlaps the first protective film 5. That is, the first protective film 5 is located between the polarizer 7 and the third protective film 3. The release film 13 overlaps the second protective film 9 via the adhesive layer 11. In other words, the second protective film 9 is located 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. The notch portion 7C is formed by the polarizing element 7 and the optical film (3,5,9,13) in the stacking direction (Z-axis direction) of the polarizer 7, the optical film (3,5,9,13) and the adhesive layer 11. ) And all of the adhesive layer 11. That is, on the end face of the polarizing plate 1A, a concave notch portion common to all of the polarizing elements 7, the optical films (3, 5, 9, 13) and the adhesive layer 11 constituting the polarizing plate 1A is formed. .. The shape of the notch portion 7C of the polarizer 7 viewed from the stacking direction (Z-axis direction) may be the same as or similar to the shape of the notch portion of the polarizing plate 1A viewed from the stacking direction. The shape of the notch portion of the polarizing plate 1A seen from the stacking direction may be regarded as the shape of the notch portion 7C of the polarizing element 7 seen from the stacking direction. In the following, not only the notch portion 7C of the polarizer 7 but also the notch portion of the polarizing plate 1A including the notch portion 7C may be referred to as “notch portion 7C”. The notch portion 7C is, for example, a rectangle.

The reference line L is defined as a straight line connecting a pair of corner portions 7C1 and 7C2 located at both ends of the notch portion 7C. The reference line L may be rephrased as a straight line connecting the pair of corner portions 7C1 and 7C2 in the direction perpendicular to the stacking direction (Z-axis direction). This reference line L is not orthogonal to the absorption axis A of the polarizer 7. In other words, the angle θ formed by the reference line L of the notch portion 7C with the absorption axis A of the polarizer 7 is 0 ° or more and less than 90 °. The absorption axis A may be rephrased as, for example, a straight line substantially parallel to the orientation direction of the polyvinyl alcohol (PVA) molecule in the polarizer 7. The absorption axis A may be rephrased as, for example, a straight line substantially parallel to the orientation direction of the dye molecule (for example, polyiodine or organic dye) adsorbed on polyvinyl alcohol in the polarizer 7. It can be said that a large number of carbon atoms constituting one PVA molecule are bonded to each other 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, the PVA molecules are bonded to each other by a cross-linking bond via a cross-linking agent (for example, boric acid). In other words, in the direction substantially perpendicular to the absorption axis A, the hydroxy group of each PVA molecule forms a hydrogen bond or an oxygen-boron bond (OB bond) with boric acid located between the PVA molecules. PVA molecules are crosslinked with each other. 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 a direction substantially parallel to the absorption axis A is higher than the mechanical strength of the polarizer 7 in a direction substantially perpendicular to the absorption axis A. In other words, the heat shrinkage of the polarizer 7 in a direction substantially parallel to the absorption axis A is less likely to cause cracks than the heat shrinkage of the polarizer 7 in a direction substantially perpendicular to the absorption axis A.

When the reference line L is orthogonal to the absorption axis A (when the angle θ is 90 °) as in the conventional polarizing plate 1C shown in FIGS. 11 and 12, the PVA molecule is in the direction parallel to the reference line L. A weak cross-linking bond is formed as compared with the CC bond in the inner. Therefore, when the reference line L is orthogonal to the absorption axis A and the deep portion (inner portion) of the notch portion 7C contracts in a direction substantially parallel to the reference line L, a crack 7cr is formed in the deep portion of the notch portion 7C. easy.

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 formed by the reference line L with 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-linking bond between the PVA molecules, enhances the mechanical strength of the polarizer 7 in the direction parallel to the reference line L. As a result, even if the deep portion of the notch portion 7C contracts in a direction substantially parallel to the reference line L, it is difficult for the crack 7cr to be formed in the deep portion of the notch portion 7C. In particular, when the reference line L is parallel to the absorption axis A (when the angle θ is 0 °), CC bonds in most of the PVA molecules constituting the polarizer 7 are formed along the absorption axis A. Has been done. 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 the formation of the crack 7cr in the notch portion 7C is remarkably suppressed. ..

The smaller the angle θ formed by the reference line L with the absorption axis A, the more difficult it is for the crack 7cr to be formed in the notch portion 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 the notch portion 7C is formed, and a second end portion 17e located on the opposite side of the first end portion 7e. In the first embodiment, both the first end portion 7e and the second end portion 17e are linear, and the first end portion 7e is parallel to the second end portion 17e. The notch portion 7C extends from the first end portion 7e toward the second end portion 17e. The direction E in which the notch portion 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 notch portion 7C extends with the absorption axis A is larger than 0 ° and 90 ° or less. In the first embodiment, the angle α is 90 °. In the first embodiment, the direction E in which the notch portion 7C extends is equal to the longitudinal direction of the notch portion 7C. That is, the longitudinal direction of the notch portion 7C is along the direction E in which the notch portion 7C extends.

Since the direction E in which the notch 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-linking bond between the PVA molecules, is in the direction perpendicular to the direction E. Increases the mechanical strength of the polarizer 7. As a result, even if the deep portion of the notch portion 7C contracts in a direction substantially perpendicular to the direction E, it is difficult for the crack 7cr to be formed in the deep portion of the notch portion 7C. The larger the angle α formed by the direction E with the absorption axis A, the more difficult it is for the crack 7cr to be formed in the notch portion 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 formed perpendicular to the direction E. Has been done. 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 the formation of the crack 7cr in the notch portion 7C is remarkably suppressed.

The width Wc of the notch portion 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 rephrased as the width of the notch portion 7C in the direction parallel to the end portion (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 entire polarizing element 7 may be rephrased as the width of the entire polarizing plate 1A in the direction parallel to the reference line L. The width W may be rephrased as the width of the entire polarizer 7 in the direction parallel to the first end portion 7e. The width Wc of the notch portion 7C may be, for example, less than the width W of the entire polarizer 7. When the width Wc of the notch portion 7C is 5 mm or more and 30 mm or less, the width W of the entire polarizer 7 (width of the entire polarizing plate 1A) is larger than 20 mm and 160 mm or less, preferably larger than 25 mm and 130 mm or less, more preferably. It may be larger than 30 mm and 100 mm or less, more preferably more than 30 mm and 70 mm or less (however, Wc <W). The ratio Wc / W of the width Wc of the notch portion 7C to the width W of the entire 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. 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, still more preferably 0.30 or more and less than 1.0, 0.33 or more and less than 1.0, or 0 It may be .40 or more and less than 1.0. The 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. The ratio Wc / W can be rephrased as the ratio of the width Wc of the notch portion 7C to the width W of the entire polarizing plate 1A. When the ratio Wc / W is in the above range, cracks in the notch portion 7C are likely to be suppressed. The reason is as follows. As the width Wc of the notch portion 7C is smaller than the width W of the entire polarizer 7, the force for expanding the width Wc of the notch portion 7C is likely to be generated due to the contraction of the entire polarizer 7 due to the temperature change, and the notch portion is formed. Cracks are likely to occur in 7C. That is, the smaller the Wc / W, the more likely the notch 7C is to crack. On the other hand, the larger the Wc / W (the smaller the width W of the entire polarizer 7), the smaller the amount of contraction of the entire polarizer 7 due to the temperature change. That is, the smaller the width W of the entire width W of the polarizer 7, the smaller the absolute value of the amount of change in the width W of the entire polarizer 7. Since the amount of contraction of the entire polarizer 7 due to the temperature change is reduced, it is difficult to generate a force for expanding the width Wc of the notch portion 7C, and cracks in the notch portion 7C are likely to be suppressed.

The length Dc of the notch portion 7C in the direction perpendicular to the reference line L may be, for example, 1 mm or more and 30 mm or less. The length Dc can be rephrased as the depth of the notch portion 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 total length D of the polarizer 7 may be rephrased as the total length of the polarizing plate 1A in the direction perpendicular to the reference line L. 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 method for producing the polarizing plate 1A includes at least a bonding step and a processing step. In the bonding step, a long strip-shaped polarizing film and a plurality of long strip-shaped optical films are bonded to prepare a laminated body (first laminated body). The long strip-shaped polarizer film is the polarizer 7 before processing and 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, 13) before processing and molding. In the subsequent processing step, the first laminate is processed to produce a plurality of laminates (second laminates) having a desired size and shape. Similar to the above-mentioned polarizing plate 1A, the second laminated body has a first end portion 7e that is not orthogonal to the absorption axis A of the polarizing element film (polarizer 7) and a second one located on the opposite side of the first end portion 7e. It has two ends 17e and. In the processing step, for example, the first laminated body may be cut in a direction not orthogonal to the absorption axis A of the polarizing element film to form a first end portion not orthogonal to the absorption axis A. In the processing step, for example, the second laminated body may be produced by cutting the first laminated body with a cutting tool. In the processing step, for example, the second laminated body may be produced by punching the first laminated body. In the processing step, for example, the second laminated body may be produced by cutting the first laminated body with a laser. The laser may be, for example, a CO ₂ laser or an excimer laser. In the processing step, for example, cutting using the above-mentioned blade, punching processing, and cutting using a laser may be combined to prepare a second laminated body. The first laminated body is processed by the above-mentioned processing method to adjust the size of the first laminated body to be larger than a predetermined size, and then the end portion of the first laminated body is cut and polished with a milling cutter to obtain the second laminated body. May be produced.

In the processing step, a concave notch portion 7C may be formed in the first end portion 7e of the second laminated body by, for example, punching processing or cutting using a cutting tool or a laser. When forming the notch portion 7C in the machining step, the notch portion 7C is extended from the first end portion 7e to the second end portion 17e, and the direction E in which the notch portion 7C extends is not parallel to the absorption axis A. Adjust in the direction. After producing the second laminated body in which the notch portion 7C is formed in the processing step, the end processing step may be performed. In the end processing step, for example, an end mill may be used to cut and polish the end face of the second laminated body including the notch portion 7C. An end mill is a type of milling cutter for cutting. The end mill is, for example, a blade located on a side surface substantially parallel to the rotation axis thereof, and cuts and polishes the end face of the second laminated body including the notch portion 7C. As a result, the end face of the second laminated body including the notch portion 7C is finished smoothly. By using this end mill, it is possible to mold the second laminated body into the polarizing plate 1A having a desired shape and size in a short time. That is, the productivity of the polarizing plate 1A is improved. In the processing step, the first laminated body may be punched out to produce the second laminated body, and in the subsequent end processing step, the end face of the second laminated body may be cut and polished by an end mill. As a result, the margin of the end portion removed from the second laminated body in the end processing step is reduced, the generation of foreign matter such as polishing debris in the end processing step is suppressed, and the foreign matter product (polarizing plate 1A). ) Is suppressed.

The cutout portion 7C may not be formed in the machining step, and the concave notch portion 7C may be formed in the first end portion 7e of the second laminated body in the end machining step following the machining step. When forming the notch portion 7C in the end processing step, the notch portion 7C is extended from the first end portion 7e to the second end portion 17e, and the direction E in which the notch portion 7C extends is the absorption axis A. Adjust in a direction that is not parallel to. In the end processing step, for example, the cutout portion 7C may be formed in the second laminated body by irradiating the end portion of the second laminated body with the above laser to cut a part or all of the end portion. .. The cutout portion 7C may be formed in the second laminated body by the end processing step using the above end mill. Further, in either the above processing step or the end processing step, Wc / W is adjusted to 0.05 or more and less than 1.0.

The direction of the absorption axis A of the polarizer 7 included in the second laminate is already known at the time of the machining step and the end machining step. Therefore, for example, as described above, the direction of punching or cutting of the first laminated body is adjusted to adjust the angle formed by the first end portion 7e of the second laminated body with the absorption axis A to 0 ° or more and less than 90 °. By doing so, the angle θ formed by the reference line L with 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 notch portion 7C is formed in the first end portion 7e of the second laminated body, the direction α of the notch portion 7C is adjusted so that the angle α formed by the direction E with the absorption axis A can be obtained. , It can be freely controlled within a range of 90 ° or less, which is larger than 0 °. As described above, the relative positional relationship between the reference line L and the absorption axis A is controlled by the direction of punching or cutting of the first laminated body and the position of forming the notch portion 7C in the second laminated body. The relative positional relationship between the direction E and the absorption axis A is controlled by the position of forming the notch portion 7C in the second laminated body and the orientation of the notch portion 7C. The direction itself of the absorption axis A in the polarizing film (polarizer 7) is adjusted and controlled by the stretching direction and stretching ratio of the PVA film performed before the machining step and the edge machining step.

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

For example, first, the PVA film is stretched in the uniaxial direction or the biaxial direction. The bicolor ratio of the polarizer 7 stretched in the uniaxial direction tends to be high. Following stretching, the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye using a dye solution. The staining solution may contain boric acid, zinc sulfate, or zinc chloride. The PVA film may be washed with water before dyeing. Washing with water removes stains and anti-blocking agents from the surface of the PVA film. Further, as a result of the PVA film swelling due to washing with water, dyeing spots (non-uniform dyeing) are likely to be suppressed. The dyed PVA film is treated with a solution of a cross-linking agent (eg, an aqueous solution of boric acid) for cross-linking. After treatment with a cross-linking agent, the PVA film is washed with water and then dried. The polarizer 7 is obtained through the above procedure. The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin. The polyvinyl acetate-based resin is, for example, polyvinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer (for example, an ethylene-vinyl acetate copolymer). Good. Other monomers copolymerizing with vinyl acetate may be unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides having an ammonium group, in addition to ethylene. 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-based resin may be a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol or a dehydrochlorinated product of polyvinyl chloride. Staining may be performed before stretching, or stretching may be performed in a dyeing solution. The length of the stretched polarizer 7 may be, for example, 3 to 7 times the length before stretching.

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. The thinner the polarizer 7, the more the contraction of the polarizer 7 due to the temperature change is suppressed, and the change in the dimensions of the polarizer 7 itself is suppressed. As a result, stress is less likely to act on the polarizer 7, and cracks in the polarizer 7 are likely to be suppressed.

The first protective film 5 and the second protective film 9 may be any translucent thermoplastic resin, and may be optically transparent thermoplastic resin. The resins constituting the first protective film 5 and the second protective film 9 include, for example, a chain polyolefin resin, a cyclic olefin polymer resin (COP resin), a cellulose ester resin, a polyester resin, and a polycarbonate resin. Meta) It may be an acrylic resin, a polystyrene resin, or a mixture or a copolymer thereof. The composition of the first protective film 5 may be exactly the same as the composition 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 kinds of chain olefins.

The cyclic olefin polymer-based resin (cyclic polyolefin-based resin) may be, for example, a ring-opening (co) polymer of cyclic olefin or an addition polymer of cyclic olefin. The cyclic olefin polymer-based resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (for example, a random copolymer). The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer resin may be a graft polymer obtained by modifying the above polymer with an unsaturated carboxylic acid or a derivative thereof, or a hydride thereof. 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 cellulosic ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate or cellulose dipropionate. These copolymers may be used. A cellulosic ester resin in which a part of the hydroxyl group is modified with another substituent may be used.

A polyester resin other than the cellulose ester resin may be used. The polyester resin may be, for example, a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. The polyvalent carboxylic acid or a derivative thereof may be a dicarboxylic acid or a derivative thereof. The polyvalent carboxylic acid or a derivative thereof 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 resin may be, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethylterephthalate, or polycyclohexanedimethylnaphthalate. ..

The polycarbonate-based resin is a polymer in which a polymerization unit (monomer) is bonded via 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 is, for example, a poly (meth) acrylic acid ester (for example, polymethyl methacrylate (PMMA)); a methyl methacrylate- (meth) acrylic acid copolymer; a methyl methacrylate- (meth) acrylic. Acid ester copolymer; Methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (for example, MS resin); methyl methacrylate and alicyclic hydrocarbon It may be a copolymer with a compound having a group (for example, a methyl methacrylate-cyclohexyl methacrylate copolymer, a methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.).

At least one of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 may contain triacetyl cellulose (TAC). At least one of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 may contain a cyclic olefin polymer-based resin (COP-based resin). At least one of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 may contain polymethyl methacrylate (PMMA). Both of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 may contain triacetyl cellulose. One of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 contains triacetyl cellulose, and the other film of the pair of optical films sandwiching the polarizer 7 is , Cyclic olefin polymer may be included. One of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 contains triacetyl cellulose, and the other film of the pair of optical films sandwiching the polarizer 7 is , Polymethylmethacrylate may be included. One of the pair of optical films (first protective film 5 and second protective film 9) sandwiching the polarizer 7 contains a cyclic olefin polymer resin, and the other of the pair of optical films sandwiching the polarizer 7 The film may contain polymethylmethacrylate. When the polarizer 7 is sandwiched between a pair of optical films (first protective film 5 and second protective film 9), the optical film (protective film) is in close contact with the polarizing element 7, and the polarizer 7 is accompanied by a temperature change. Since the expansion or contraction of the polarizing element 7 is suppressed, cracks in the polarizer 7 are unlikely to occur. For example, when the polarizer 7 is sandwiched between the first protective film 5 made of TAC and the second protective film 9 made of COP-based resin, cracks in the polarizer 7 are unlikely to occur.

The first protective film 5 or the second protective film 9 is at least one selected from the group consisting of lubricants, plasticizers, dispersants, heat stabilizers, ultraviolet absorbers, infrared absorbers, antistatic agents, and antioxidants. Additives may be included.

The thickness of the first protective film 5 may 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 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, by stretching a film made of the above-mentioned thermoplastic resin or forming a liquid crystal layer or the like on the film, a retardation film to which an arbitrary retardation value is given can be obtained.

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

The active energy ray-curable resin is a resin that is cured by being irradiated with active energy rays. The active energy ray may be, for example, ultraviolet light, visible light, electron beam, or X-ray. The active energy ray-curable resin may be an ultraviolet curable resin.

The active energy ray-curable resin may be a kind of resin and may contain a plurality of kinds of resins. For example, the active energy ray-curable resin may contain a cationically polymerizable curable compound or a radically polymerizable curable compound. The active energy ray-curable resin may contain a cationic polymerization initiator or a radical polymerization initiator for initiating the curing reaction of the curable compound.

The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in the molecule) or an oxetane compound (a compound having at least one oxetane ring in the molecule). The radically polymerizable curable compound may be, for example, a (meth) acrylic compound (a compound having at least one (meth) acryloyloxy group in the molecule). The radically polymerizable curable compound may be a vinyl compound having a radically polymerizable double bond.

The active energy ray-curable resin can be used as a cationic polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow conditioner, a plasticizer, and a defoaming agent, if necessary. It may contain agents, antistatic agents, leveling agents, solvents and the like.

The pressure-sensitive adhesive layer 11 may include, for example, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or a urethane-based 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 resin listed as the resin constituting the first protective film 5 or the second protective film 9. The thickness of the third protective film 3 may be, for example, 5 μm or more and 200 μm or less.

The resin constituting the release film 13 may be the same as the above-mentioned resin listed 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, an organic EL display device, or the like. For example, as shown in FIG. 4, the liquid crystal display device 30A according to the first embodiment is a polarizing plate 1Aa (first polarizing plate) that overlaps the liquid crystal cell 10 and one surface (first surface) of the liquid crystal cell 10. And another polarizing plate 1Ab (second polarizing plate) that overlaps the other surface (second surface) of the liquid crystal cell 10. The second surface may be rephrased as the back surface of the first surface. The polarizing plates 1Aa and 1Ab shown in FIG. 4 are the same as the polarizing plates 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 attached to the first surface of the liquid crystal cell 10 via the adhesive layer 11. The polarizing plate 1Aa (first polarizing plate) includes an adhesive layer 11 that overlaps the first surface of the liquid crystal cell 10, a second protective film 9 that overlaps the adhesive layer 11, a polarizer 7 that overlaps the second protective film 9, and polarized light. It has a first protective film 5 that overlaps the child 7. Another polarizing plate 1Ab (second polarizing plate) is attached 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 that overlaps the second surface of the liquid crystal cell 10, a second protective film 9 that overlaps the adhesive layer 11, and a polarizer 7 that overlaps the second protective film 9. A first protective film 5 that overlaps the polarizer 7. The liquid crystal cell 10 and a pair of polarizing plates 1Aa and 1Ab form 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 in FIG.

(Second Embodiment)
Hereinafter, the second embodiment of the present invention shown in FIGS. 5 and 6 will be described. Also in the second embodiment, cracks due to a temperature change can be suppressed in the notch portion of the polarizer by the same mechanism as in the case of the first embodiment. Hereinafter, matters specific to the second embodiment (differences 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 according to the second embodiment includes a third protective film 3, a first protective film 5, a polarizing element 7, an adhesive layer 11, and a release film 13. In the second embodiment, the first protective film 5 is in close contact with one of the surfaces of the polarizer 7, and the third protective film 3 is overlapped with the first protective film 5. The adhesive layer 11 is directly adhered to the other surface of the polarizer 7 instead of the second protective film 9. That is, the adhesive layer 11 is sandwiched between the polarizing element 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 polarizing plate 1B according to the second embodiment is not provided. In other words, only one side of the polarizing element 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 polarizing element 7 is protected by the protective film (protective layer). It has not been. Generally, compared to a polarizing element whose both surfaces are protected by a protective form (protective layer), a polarizer in which only one side is protected by a protective film (protective layer) cuts cracks due to temperature changes. It is easy to form in the notch. 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 crack 7cr in the notch portion 7C is suppressed. Further, in the second embodiment, as in the first embodiment, since the direction E in which the notch portion 7C extends is not parallel to the absorption axis A, the formation of the crack 7cr in the notch portion 7C is likely to be suppressed.

As shown in FIG. 6, the liquid crystal display device 30B according to the second embodiment includes a liquid crystal cell 10, a polarizing plate 1Ba (first polarizing plate) overlapping one surface (first surface) of the liquid crystal cell 10, and a liquid crystal. It includes another polarizing plate 1Bb (second polarizing plate) that overlaps the other surface (second surface) of the cell 10. The polarizing plates 1B and 1Bb shown in FIG. 6 are the same as the polarizing plates 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 attached to the first surface of the liquid crystal cell 10 via the adhesive layer 11. The polarizing plate 1Ba (first polarizing plate) has an adhesive layer 11 that overlaps the first surface of the liquid crystal cell 10, a polarizer 7 that overlaps the adhesive layer 11, and a first protective film 5 that overlaps the polarizing element 7. Another polarizing plate 1Bb (second polarizing plate) is attached 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 that overlaps the second surface of the liquid crystal cell 10, a polarizing element 7 that overlaps the adhesive layer 11, and a first protective film 5 that overlaps the polarizing element 7. Have. The liquid crystal cell 10 and a pair of polarizing plates 1Ba and 1Bb form 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.

(Other embodiments)
Although the first embodiment and the second embodiment of the present invention have been described above, the present invention is not limited to the above embodiment.

For example, as long as the reference line L connecting the pair of corners located at both ends of each notch is not orthogonal to the absorption axis A of the polarizer, a plurality of notches may be formed on the polarizing plate.

The shape of each of the polarizing plate and the notch may be various depending on the application. For example, as shown in FIG. 7A, the width of the notch portion 7C in the direction parallel to the reference line L may be larger than the depth of the notch portion in the direction perpendicular to the reference line L. As shown in FIG. 7B, the shape of the notch portion 7C may be a semicircle. As shown in (c) in FIG. 7, the shape of the notch portion 7C may be a triangle. The shape of the notch portion 7C may be a polygon other than a quadrangle and a triangle. The shapes of the polarizers 7 shown in (a) in FIG. 7, (b) in FIG. 7, and (c) in FIG. 7 are regarded as the shapes of the polarizing plates having the respective polarizers 7. You can. In other words, the shape of the notch 7C formed in each of the polarizing elements 7 shown in (a) in FIG. 7, (b) in FIG. 7, and (c) in FIG. 7 is the shape of each polarizing element. It may be regarded as the shape of the notch formed in the polarizing plate provided with 7.

As shown in (a) in FIG. 8, the outer edge (first end portion 7e and second end portion 17e) of the polarizer 7 may be circular. As shown in FIG. 8B, a chamfered part 7C3 and a chamfered portion 7C4 may be formed in a deep portion (corner portion) of the notch portion 7C. The corners 7C1 and 7C2 located at both ends of the notch 7C may also be chamfered. When the corners 7C1 and 7C2 located at both ends of the notch 7C are chamfered, the reference line L may be rephrased as a straight line tangent to the corners 7C1 and 7C2. The outer corner CR1, the outer corner CR2, the outer corner CR3, and the outer corner CR4 located on the outer edge of the polarizer 7 may also be chamfered. The above chamfering is possible, for example, by cutting and polishing the notch and the outer edge used in the end mill. The shapes of the polarizers 7 shown in (a) in FIG. 8, (b) in FIG. 8 and (c) in FIG. 8 are regarded as the shapes of the polarizing plates having the respective polarizers 7. You can. In other words, the shape of the notch 7C formed in each of the polarizing elements 7 shown in (a) in FIG. 8, (b) in FIG. 8 and (c) in FIG. 8 is the shape of each polarizing element. It may be regarded as the shape of the notch formed in the polarizing plate provided with 7. As shown in FIG. 13, the chamfered portion 7C3 may be formed in the deep portion (innermost portion) of the triangular notch portion 7C. The shape of the notch portion 7C formed in the polarizer 7 shown in FIG. 13 may be regarded as the shape of the notch portion formed in the polarizing plate including the polarizing element 7. As shown in (b) and FIG. 13 in FIG. 8, since the deep portion of the notch portion 7C is chamfered, cracks in the notch portion 7C are easily suppressed. The chamfered portion 7C3 and the chamfered portion 7C4 shown in FIG. 8B may be rephrased as a curved deep portion (corner portion) of the notched portion. The chamfered portion 7C3 shown in FIG. 13 may also be rephrased as a curved deep portion (corner portion) of the notched portion. The larger the radius of curvature of the curved deep portion (corner portion) of the notch portion 7C, the easier it is to suppress cracks in the notch portion 7C. For example, when the radius of curvature of the curved deep portion (corner portion) of the notch portion 7C is 0.07 mm or more, cracks in the notch portion 7C are likely to be suppressed. The radius of curvature of the curved deep portion (corner portion) of the notch portion 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 and 10 mm. It may be as follows.

A part of the outer edge of the polarizer may be linear, and the rest of the outer edge of the polarizer may be curved. A part of the first end of the polarizer may be linear, and the rest 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 first end of the polarizing plate may consist only of a curved line. A part of the second end of the polarizer may be linear, and the rest of the second end 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 second end of the polarizing plate may consist only of a curved line. 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 ellipse. 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 notch portion 7C is formed does not have to be parallel to the second end portion 17e. As shown in FIG. 9, when the first end portion 7e is not parallel to the second end portion 17e and the deep portion 7Cd (bottom portion) of the notch portion 7C is linear, the “direction in which the notch portion 7C extends” "E" may be defined as a direction parallel to a straight line that bisects the line segment S connecting the pair of corner portions 7C1 and 7C2 and bisects the linear deep portion 7Cd of the notch portion 7C. When the pair of corner portions 7C1 and 7C2 are chamfered, the line segment S may be a line segment tangent to both of the pair of corner portions 7C1 and 7C2. As shown in FIG. 10, when the first end portion 7e is not parallel to the second end portion 17e and the deep portion 7Cd of the notch portion 7C is curved, the “direction E in which the notch portion 7C extends” is , The direction parallel to the straight line connecting the deep portion 7Cd (deepest portion) of the notch portion 7C and the midpoint Sc of the line segment S may be defined. If the deep portion 7Cd of the curved notch portion 7C is branched into a plurality of branches, the “direction E in which the notch portion 7C extends” is a line segment with each of the plurality of deep portions (deepest portions) of the notch portion 7C. It may be defined as a direction parallel to the straight line connecting the midpoint Sc of S. Since the direction E corresponding to each of the plurality of deep portions (deepest portions) of the notch portion 7C is not parallel to the absorption axis A, cracks in each deep portion are suppressed.

The type, number, and stacking order of the optical films constituting the polarizing plate are not limited. For example, a modified example of the polarizing plate according to the second embodiment may include a third protective film 3, a polarizer 7, a second protective film 9, an adhesive layer 11, and a release film 13. That is, the third protective film 3 may be in close contact with one of the surfaces of the polarizer 7 instead of the first protective film 5. The second protective film 9 may be in close contact with the other surface of the polarizer 7, and the release film 13 may be overlapped with the second protective film 9 via the adhesive layer 11. As described above, the modified example of the polarizing plate according to the second embodiment may be different from the polarizing plate 1B according to the second embodiment in that the first protective film 5 is not provided and the second protective film 9 is provided. ..

The number of optical films included in the polarizing plate may be one. For example, the modified example of the polarizing plate 1A shown in FIG. 1 may not include both the first protective film 5 and the second protective film 9. For example, one or both of the polarizing plate 1Aa (first polarizing plate) and the polarizing plate 1b (second polarizing plate) shown in FIG. 4 includes the first protective film 5 and / or the second protective film 9. It does not have to be.

The polarizing plate 1A may not include one or both of the third protective film 3 and the release film 13. For example, the third protective film 3 may be peeled off and removed from the polarizing plate 1A in the manufacturing process of the image display device. That is, the third protective film 3 may be a temporary protective film. The release film 13 may also be peeled off and removed from the polarizing plate 1A in the manufacturing process of the image display device.

Instead of the first protective film 5 or the second protective film 9, a thinner protective layer may be laminated directly 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 active energy rays, a protective layer thinner than a conventional protective film is directly formed on the surface of the polarizer. Will be done. In other words, a thin protective layer may be formed from the active energy ray-curable resin itself used for adhering the polarizer to the protective film.

The release film may be arranged on both sides of the polarizing plate via the adhesive layer.

The optical film included in the polarizing plate is a reflective polarizing film, a film with an antiglare function, a film with a surface antireflection function, a reflection film, a transflective reflective film, a viewing angle compensation film, an optical compensation layer, a touch sensor layer, and an antistatic layer. Alternatively, it may be an antifouling layer.

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 first protective film 5 may be located between the hard coat layer and the polarizer 7, and the hard coat layer is the first protective film 5 and the first protective film. (3) It may be located between the protective film 3 and the protective film 3. In this case, the first protective film 5 may contain triacetyl cellulose.

The hard coat layer is, for example, a layer made of an acrylic resin film having a fine uneven shape on the surface. The hard coat layer may be formed from, for example, a coating film containing organic fine particles or inorganic fine particles. A method of pressing this coating film against a roll having an uneven shape (for example, an embossing method or the like) may be used. 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 and the like. Further, the organic fine particles (resin particles) may be, for example, crosslinked polyacrylic acid particles, crosslinked methyl methacrylate / styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethylmethacrylate particles, silicone resin particles, polyimide particles and the like. .. The binder component for dispersing the inorganic fine particles or the organic fine particles may be selected from a material having a high hardness (hard coat). The binder component may be, for example, an ultraviolet curable resin, a thermosetting resin, an electron beam curable resin, or the like. From the viewpoint of productivity, hardness and the like, an ultraviolet curable resin is preferably used as the 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.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1)
A rectangular first laminated body composed of a polarizer film (polarizer 7 before cutting), four optical films (3, 5, 9, 13) and a pressure-sensitive adhesive layer 11 was produced. The first laminate includes a release film 13, an adhesive layer 11 that overlaps the release film 13, a second protective film 9 that overlaps the adhesive layer 11, and a polarizer film (7) that overlaps the second protective film 9. A first protective film 5 that overlaps the polarizer film (7) and a third protective film 3 that overlaps the first protective film 5 are provided. As the polarizer film (7), stretched and dyed film-like polyvinyl alcohol was used. As the first protective film 5, a triacetyl cellulose (TAC) film was used. As the second protective film 9, a film composed of a cyclic olefin polymer resin (COP resin) was used. As the third protective film 3, a PET protect film was used. A PET separator was used as the release film 13. The thickness of the release film 13 was 38 μm. The thickness of the adhesive layer 11 was 20 μm. The thickness of the second protective film 9 was 13 μm. The thickness of the polarizer 7 was 7 μm. The thickness of the first protective film 5 was 25 μm. The thickness of the third protective film 3 was 58 μm.

The first laminated body was cut with a cutter to prepare a second laminated body having a horizontal side length of 170 mm and a vertical side length of 100 mm. When cutting the first laminated body, by adjusting the cutting direction of the first laminated body, the angle θ formed by the lateral side (first end portion) of the second laminated body with the absorption axis A of the polarizer 7 is set. , Adjusted to the angle shown in Table 1 below. The absorption axis A of the polarizer 7 was parallel to the stretching direction of the polarizer film (7).

The second laminate was adsorbed on the stage and fixed. By irradiating the outer edge of the fixed second laminated body with a CO ₂ laser, a concave notch was formed on the lateral side (first end portion) of the second laminated body. Through the above steps, the polarizing plate of Example 1 was obtained. 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 the shape of the polarizer 7 shown in FIG. 8 (c). That is, the polarizer 7 shown in FIG. 8 (c) is a polarizing element included in the polarizing plate produced by the above procedure. The shape of the notch portion 7C formed in the first end portion 7e (horizontal side of the second laminated body) of the polarizer 7 was substantially a semicircle. When the reference line L is defined as a straight line connecting the corner portions 7C1 and the corner portions 7C2 located at both ends of the notch portion 7C, the angle formed by the reference line L with the absorption axis A was equal to the above angle θ. The width Wc of the notch 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. The depth of the notch 7C in the direction perpendicular to the reference line L was 10 mm. The width W of the first end portion 7e of the polarizer 7 on which the notch portion 7C was formed was 150 mm. That is, the length of the lateral side of the polarizing plate (width W of the polarizing plate) was 150 mm. The length of the vertical side of the polarizing plate (vertical width of the polarizing plate) was 80 mm. Wc / W was 20 mm / 150 mm, that is, 0.13.

The release film 13 was peeled off from the adhesive layer 11 of the polarizing plate, and the polarizing plate was attached to the glass plate via the adhesive layer 11. Further, the third protective film 3 was peeled off from the polarizing plate. By such a procedure, a sample composed of a glass plate and a polarizing plate bonded 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: The step of heating the sample in an atmosphere of 85 ° C. for 30 minutes.
Step 2: The step of cooling the sample in an atmosphere of −40 ° C. for 30 minutes.

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

(Examples 2 to 8, Comparative Example 1)
The same method as in Example 1 except that the angle θ formed by the lateral side (first end portion) of the second laminated body with the absorption axis A of the polarizer 7 is adjusted to the angle shown in Table 1 below. The polarizing plates of Examples 2 to 8 and Comparative Example 1 were individually prepared. That is, in the production of the polarizing plates of Examples 2 to 8 and Comparative Example 1, the angle θ formed by the reference line L with the absorption axis A was adjusted to the angle shown in Table 1 below. Similar to the case of Example 1, a heat cycle test was performed using the polarizing plates of Examples 2 to 8 and Comparative Example 1.

The results of the heat cycle tests of Examples 1 to 8 and Comparative Example 1 are shown in Table 1 below. “A” in the table means that there were no cracks in the notch portion 7C of the polarizer 7. “B” means that a minute crack was formed in the notch portion 7C of the polarizer 7. “C” means that a crack larger than that in the case of “B” was formed in the notch portion 7C of the polarizer 7. The “B” described in the row of Comparative Example 1 means that a crack having a length of about 1 mm was formed. “B” in the row of Example 1 means that a crack having a length of about 10 mm has been formed.

(Examples 9 and 10, Comparative Example 2)
The polarizing plates of Examples 9 and 10 and Comparative Example 2 were individually prepared in the same manner as in Example 1 except that the shape and angle θ of the notch portion 7C were changed.

The shapes of the polarizers of Examples 9 and 10 and Comparative Example 2 were the same as the shapes of the polarizer 7 shown in FIG. That is, in the cases of Examples 9 and 10 and Comparative Example 2, the shape of the notch portion 7C formed in the first end portion 7e (horizontal side of the second laminated body) of the polarizer 7 was substantially triangular. .. The shapes of the polarizing plates of Examples 9 and 10 and Comparative Example 2 were the same as the shape of the polarizer 7 shown in FIG. 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 cases of Examples 9 and 10 and Comparative Example 2, the width Wc of the notch 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 cases of Examples 9 and 10 and Comparative Example 2, the length Dc (depth) of the notch portion 7C in the direction perpendicular to the reference line L was 10 mm. In the cases of Examples 9 and 10 and Comparative Example 2, the chamfered portion 7C3 was formed in the deep portion (corner portion) of the notch portion 7C. The radius of curvature of the chamfered portion 7C3 of the notched portion 7C was 0.1 mm. In the cases of Examples 9 and 10 and Comparative Example 2, the width W of the first end portion 7e of the polarizer 7 in which the notch portion 7C was formed was 150 mm. That is, the length of the lateral side of the polarizing plate (width W of the polarizing plate) was 150 mm. In the case of Examples 9 and 10 and Comparative Example 2, the length of the vertical side of the polarizing plate (vertical width of the polarizing plate) was 80 mm. Wc / W was 20 mm / 150 mm, that is, 0.13.

Similar to the case of Example 1, a heat cycle test was performed using the polarizing plates of Examples 9 and 10 and Comparative Example 2. The results of the heat cycle tests of Examples 9 and 10 and Comparative Example 2 are shown in Table 2 below.

(Examples 11 to 17)
In the preparation of the polarizing plates of Examples 11 to 17, the angle θ was adjusted to 45 °.

The shape of each of the polarizers of Examples 11 to 17 was the same as the shape of the polarizer 7 shown in FIG. That is, in the case of Examples 11 to 17, the shape of the notch portion 7C formed in the first end portion 7e (horizontal side of the second laminated body) of the polarizer 7 was substantially triangular. The shape of each of the polarizing plates of Examples 11 to 17 was the same as the shape of the polarizer 7 shown in FIG.

In the case of Examples 11 to 17, the width W of the first end portion 7e of the polarizer 7 in which the notch portion 7C was formed was adjusted to the value shown in Table 3 below. The width W can be rephrased as the length of the lateral side of the polarizing plate (the width of the polarizing plate).

In the case of Examples 11 to 17, the width Wc of the notch 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 11 to 17, Wc / W was the value shown in Table 3 below. In the case of Examples 11 to 17, the length Dc (depth) of the notch portion 7C in the direction perpendicular to the reference line L was 10 mm. In the case of Examples 11 to 17, the chamfered portion 7C3 was formed in the deep portion (corner portion) of the notched portion 7C. The radius of curvature of the chamfered portion 7C3 of the notched portion 7C was 0.1 mm. In the case of Examples 11 to 17, the length of the vertical side of the polarizing plate (vertical width of the polarizing plate) was 70 mm.

The polarizing plates of Examples 11 to 17 were individually prepared in the same manner as in Example 1 except for the above items.

Similar to the case of Example 1, a heat cycle test using the polarizing plates of Examples 11 to 17 was performed. In each of the heat cycle tests of Examples 11 to 17, one surface of the polarizer 7 is covered with a second protective film 9 (a film composed of a COP-based resin), and the other surface of the polarizer 7 is covered. Was covered with a first protective film 5 (TAC film). The results of the heat cycle tests of Examples 11 to 17 are shown in Table 3 below.

(Examples 18 to 20)
In the preparation of the first laminated body of Examples 18 to 20, the third protective film 3 (PET protective film) was directly laminated on the polarizer 7 without using the first protective film 5 (TAC film).

In the preparation of the polarizing plates of Examples 18 to 20, the angle θ was adjusted to 45 °.

The shape of each of the polarizers of Examples 18 to 20 was the same as the shape of the polarizer 7 shown in FIG. That is, in the case of Examples 18 to 20, the shape of the notch portion 7C formed in the first end portion 7e (horizontal side of the second laminated body) of the polarizer 7 was substantially triangular. The shape of each of the polarizing plates of Examples 18 to 20 was the same as the shape of the polarizer 7 shown in FIG.

In the case of Examples 18 to 20, the width W of the first end portion 7e of the polarizer 7 in which the notch portion 7C was formed was adjusted to the value shown in Table 3 below. The width W can be rephrased as the length of the lateral side of the polarizing plate (the width of the polarizing plate).

In the case of Examples 18 to 20, the width Wc of the notch 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 the value shown in Table 3 below. In the case of Examples 18 to 20, the length Dc (depth) of the notch portion 7C in the direction perpendicular to the reference line L was 10 mm. In the case of Examples 18 to 20, the chamfered portion 7C3 was formed in the deep portion (corner portion) of the cutout portion 7C. The radius of curvature of the chamfered portion 7C3 of the notched portion 7C was 0.1 mm. In the case of Examples 18 to 20, the length of the vertical side of the polarizing plate (vertical width of the polarizing plate) was 70 mm.

The polarizing plates of Examples 18 to 20 were individually prepared in the same manner as in Example 1 except for the above items.

Similar to the case of Example 1, a heat cycle test was performed using the polarizing plates of Examples 18 to 20 respectively. As described above, each of the polarizing plates of Examples 18 to 20 did not include the first protective film 5 (TAC film). Therefore, in each of the heat cycle tests of Examples 18 to 20, one surface of the polarizer 7 was covered with the second protective film 9 (a film composed of a COP-based resin), but the other of the polarizers 7 was covered. The surface of the surface was exposed without being covered with the first protective film 5 (TAC film). The results of the heat cycle tests of Examples 18 to 20 are shown in Table 3 below.

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

The shapes of the polarizers of Examples 21 to 23 and Comparative Example 3 are the polarizers 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 had the same shape as 7.

The width W of the entire polarizer 7 can be rephrased as the width of the entire polarizer 7 in the direction parallel to the reference line L. The width W of the entire polarizer 7 may be rephrased as the width of the entire polarizer 7 in the direction parallel to the first end portion 7e. In both Examples 21 to 23 and Comparative Example 3, the width W of the entire polarizer 7 in the direction parallel to the reference line L was 170 mm. The vertical width D of the entire polarizer 7 can be rephrased as the width of the entire polarizer 7 in the direction perpendicular to the reference line L. In both Examples 21 to 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 both Examples 21 to 23 and Comparative Example 3, the notch portion 7C formed in the first end portion 7e (horizontal side of the second laminated body) of the polarizer 7 The shape was rectangular. In the case of Examples 21 to 23 and Comparative Example 3, the width Wc of the notch portion 7C in the direction parallel to the reference line L was a value shown in Table 4 below. In the case of Examples 21 to 23 and Comparative Example 3, Wc / W was the value shown in Table 4 below. In both Examples 21 to 23 and Comparative Example 3, the length Dc (depth) of the notch portion 7C in the direction perpendicular to the reference line L was 5 mm.

The polarizing plates of Examples 21 to 23 and Comparative Example 3 were individually prepared in the same manner as in Example 1 except for the above items.

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

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

1A, 1Aa, 1Ab, 1B, 1Ba, 1Bb, 1C ... Polarizing plate, 3 ... Third protective film, 5 ... First protective film, 7 ... Polarizer, 7C ... Notch, 7C1, 7C2 ... Notch 7C A pair of corners located at both ends, 7e ... Polarizer end (first end), 7cr ... Crack, 9 ... Second protective film, 7Cd ... Notch 7C deep, 10 ... Liquid crystal cell, 11 ... Adhesive layer, 13 ... Release film, 17e ... Second end of polarizer, 20A, 20B ... Liquid crystal panel, 30A, 30B ... Liquid crystal display device (image display device), L ... Reference line, A ... Absorption axis, E: the direction in which the notch 7C extends, S: the line connecting the pair of corners 7C1 and 7C2, Sc: the midpoint of the line S, θ: the angle formed by the reference line L with the absorption axis A, α: the notch. The angle at which the direction E in which the portion C extends is formed with the absorption axis A of the polarizer.

Claims (17)

Equipped with a film-like polarizer,
A concave notch is formed at the end of the polarizer.
The polarizer has a quadrangular shape, and the notch portion is formed on only one of the four sides of the polarizer.
When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch,
The reference line L is not orthogonal to the absorption axis A of the polarizer,
Wc is the width of the notch in the direction parallel to the reference line L.
W is the width of the entire polarizer in the direction parallel to the reference line L.
Wc / W is 0.10 or more and 0.45 or less ,
The angle θ formed by the reference line L with the absorption axis A is 0 ° or more and 60 ° or less.
The depth Dc of the notch in the direction perpendicular to the reference line L is 1 mm or more and 10 mm or less.
The length D of the entire polarizer in the direction perpendicular to the reference line L is 100 mm or more and 600 mm or less.
The thickness of the polarizer is 1 μm or more and 10 μm or less.
Polarizer. Equipped with a film-like polarizer,
A concave notch is formed at the end of the polarizer.
The polarizer has a quadrangular shape, and the notch portion is formed on only one of the four sides of the polarizer.
When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch,
The reference line L is not orthogonal to the absorption axis A of the polarizer,
Wc is the width of the notch in the direction parallel to the reference line L.
W is the width of the entire polarizer in the direction parallel to the reference line L.
Wc / W is 0.10 or more and 0.45 or less ,
The angle θ formed by the reference line L with the absorption axis A is 0 ° or more and 60 ° or less.
The depth Dc of the notch in the direction perpendicular to the reference line L is 1 mm or more and 10 mm or less.
The length D of the entire polarizer in the 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 protective film or protective layer in close contact with one surface of the polarizer contains a triacetyl cellulose or a cyclic olefin polymer resin.
Polarizer. The protective film or protective layer in close contact with one surface of the polarizer contains triacetyl cellulose and contains triacetyl cellulose.
The protective film or protective layer in close contact with the other surface of the polarizer contains a cyclic olefin polymer resin.
The polarizing plate according to claim 2. Equipped with a film-like polarizer,
A concave notch is formed at the end of the polarizer.
The polarizer has a quadrangular shape, and the notch portion is formed on only one of the four sides of the polarizer.
When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch,
The reference line L is not orthogonal to the absorption axis A of the polarizer,
Wc is the width of the notch in the direction parallel to the reference line L.
W is the width of the entire polarizer in the direction parallel to the reference line L.
Wc / W is 0.10 or more and 0.45 or less ,
The angle θ formed by the reference line L with the absorption axis A is 0 ° or more and 60 ° or less.
The depth Dc of the notch in the direction perpendicular to the reference line L is 1 mm or more and 10 mm or less.
The length D of the entire polarizer in the 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 of the two surfaces of the polarizer.
The protective film or the protective layer contains a triacetyl cellulose or a cyclic olefin polymer resin.
Polarizer. An adhesive layer is in close contact with the other surface of the polarizer.
The polarizing plate according to claim 4. Equipped with a film-like polarizer,
A concave notch is formed at the end of the polarizer.
The polarizer has a quadrangular shape, and the notch portion is formed on only one of the four sides of the polarizer.
When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch,
The reference line L is not orthogonal to the absorption axis A of the polarizer,
Wc is the width of the notch in the direction parallel to the reference line L.
W is the width of the entire polarizer in the direction parallel to the reference line L.
Wc / W is 0.10 or more and 0.45 or less ,
The angle θ formed by the reference line L with the absorption axis A is 0 ° or more and 60 ° or less.
The depth Dc of the notch in the direction perpendicular to the reference line L is 1 mm or more and 10 mm or less.
The length D of the entire polarizer in the 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.
An adhesive layer is in close contact with the other surface of the polarizer.
Polarizer. The thickness of the polarizer is 1 μm or more and 10 μm or less.
The polarizing plate according to any one of claims 2 to 6. The polarizer has a first end portion and a second end portion located on the opposite side of the first end portion.
The notch portion is formed in the first end portion, and the notch portion is formed.
The notch extends from the first end to the second end.
The direction E in which the notch extends is not parallel to the absorption axis A of the polarizer.
The polarizing plate according to any one of claims 1 to 7. The angle θ formed by the reference line L with the absorption axis A is 0 ° or more and 30 ° or less.
The polarizing plate according to any one of claims 1 to 8. On the upper surface of the polarizer, the deep portion of the notch is linear.
The deep part of the notch is parallel to the reference line L.
The polarizing plate according to any one of claims 1 to 9. The shape of the notch is a quadrangle.
The polarizing plate according to any one of claims 1 to 10. The deep part of the notch is chamfered,
The polarizing plate according to any one of claims 1 to 9. The polarizer is exposed in the notch.
The polarizing plate according to any one of claims 1 to 12. Used in image display devices,
The polarizing plate according to any one of claims 1 to 13. The polarizing plate according to any one of claims 1 to 14 is included.
Image display device. The method for producing a polarizing plate according to any one of claims 1 to 14.
A step of producing a first laminate containing a polarizer film and at least one optical film that overlaps the polarizer film.
A step of processing the first laminate to produce a second laminate having a first end portion that is not orthogonal to the absorption axis A of the polarizer film.
A step of forming a concave notch in the first end portion, and
With
When the reference line L is defined as a straight line connecting a pair of corners located at both ends of the notch,
Wc is the width of the notch in the direction parallel to the reference line L.
W is the width of the entire polarizing film in the direction parallel to the reference line L.
Adjust Wc / W to 0.10 or more and 0.45 or less,
Method for manufacturing a polarizing plate. The second laminate has a second end located on the opposite side of the first end.
The notch is extended from the first end to the second end, and the direction E in which the notch extends is adjusted in a direction not parallel to the absorption axis A.
The method for manufacturing a polarizing plate according to claim 16.

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