KR102584064B1 - Method for manufacturing polarizing plate - Google Patents

Abstract

The object of the present invention is to provide a method for manufacturing a polarizing plate and a method for manufacturing a liquid crystal panel that can manufacture a polarizing plate whose absorption axis is more accurately oriented in the design direction.
A method of manufacturing a polarizing plate according to an embodiment is a method of manufacturing a polarizing plate 1 having an absorption axis S _A , wherein the first strip-shaped polarizing plate 10 is cut at a plurality of locations in the width direction to form a first strip-shaped polarizing plate 10. A cutting process for obtaining a plurality of second strip-shaped polarizers (12 ₁ to 12 _N ) (N is an integer of 2 or more) having a width narrower than the width of the polarizer, and a polarizer area in the second strip-shaped polarizer corresponding to the polarizer to be manufactured (31), based on the direction of the absorption axis in the second strip-shaped polarizer, the direction of the absorption axis in the polarizer region is a polarizer region in which the direction of the absorption axis in the polarizer to be manufactured is toward the design direction of the absorption axis in the polarizer to be manufactured. It includes a processing step of obtaining a polarizing plate by processing and taking out a strip-shaped polarizing plate.

Description

Manufacturing method of polarizer {METHOD FOR MANUFACTURING POLARIZING PLATE}

The present invention relates to a method of manufacturing a polarizing plate and a method of manufacturing a liquid crystal panel.

As a polarizing plate, a linear polarizing plate is known, which has an absorption axis and a transmission axis orthogonal to the absorption axis, absorbs light vibrating in the absorption axis direction, and transmits light vibrating in the transmission axis direction. Such a polarizing plate is manufactured, for example, by cutting a strip-shaped polarizing plate into a predetermined size (see Patent Documents 1 and 2). Here, the strip-shaped polarizing plate is manufactured, for example, by laminating a protective film on both sides or one side of a strip-shaped polarizer film. A strip-shaped polarizer film is usually manufactured by uniaxially stretching a strip-shaped raw material resin film in the longitudinal direction. In this manufacturing method, the direction of the absorption axis of the strip-shaped polarizing plate is parallel to the direction in which the raw material resin film is stretched in uniaxial stretching. Since the uniaxial stretching of the raw material resin film is performed in the longitudinal direction, it is assumed that the longitudinal direction of the strip-shaped polarizing plate coincides with the absorption axis direction. Therefore, a polarizing plate is manufactured using a strip-shaped polarizing plate so that the absorption axis of the polarizing plate faces a predetermined direction within the polarizing plate based on the longitudinal direction of the strip-shaped polarizing plate. Conventionally, polarizing plates manufactured in this way were practical even when applied to liquid crystal display devices, for example.

Patent Document 1: Japanese Patent Publication No. Heisei 11-231129 Patent Document 2: Japanese Patent Publication No. Heisei 11-2724

When manufacturing a polarizing plate assuming that the longitudinal direction of the strip-shaped polarizing plate is the direction of the absorption axis, in reality, there is a slight deviation (for example, 0.2°) between the predetermined direction of the absorption axis required for the product polarizing plate and the direction of the absorption axis of the actual polarizing plate. It was found that there were cases where (about ∼0.3°) occurred. This discrepancy is thought to be due to a discrepancy that occurs between the stretching direction when the raw material resin film is uniaxially stretched in the manufacture of the strip-shaped polarizer that is to be used as a polarizer, and the longitudinal direction of the strip-shaped polarizer. Meanwhile, in recent years, for example, displays for small and medium-sized portable devices, etc., higher contrast has been required. As contrast increases in displays, etc., and there is a slight discrepancy between the predetermined direction of the absorption axis required for the product polarizer and the direction of the absorption axis of the actual polarizer, there is a risk that image quality may deteriorate due to the discrepancy.

Therefore, the purpose of the present invention is to provide a method of manufacturing a polarizing plate and a method of manufacturing a liquid crystal panel that can manufacture a polarizing plate whose absorption axis is more accurately oriented in the design direction.

A method of manufacturing a polarizing plate according to one aspect of the present invention is a method of manufacturing a polarizing plate having an absorption axis, wherein a first strip-shaped polarizing plate is cut at a plurality of places in the width direction, and a plurality of strips having a width narrower than the width of the first strip-shaped polarizing plate are manufactured. A cutting process for obtaining a second strip-shaped polarizer, and a polarizer area in the second strip-shaped polarizer corresponding to the polarizer to be manufactured, based on the direction of the absorption axis in the second strip-shaped polarizer, the absorption axis in the polarizer area. A processing step is provided to obtain a polarizing plate by processing each second strip-shaped polarizing plate and extracting a region of the polarizing plate whose direction faces the design direction of the absorption axis of the polarizing plate to be manufactured.

In this method, the first strip-shaped polarizing plate is cut at a plurality of places in the width direction to obtain a second strip-shaped polarizing plate having a width narrower than the width of the first strip-shaped polarizing plate, and then a polarizing plate is manufactured from each of the second strip-shaped polarizing plates.

Since the width of each second strip-shaped polarizer is narrower than the width of the first strip-shaped polarizer, the variation in the absorption axis direction in the width direction of each second strip-shaped polarizer is the absorption axis in the width direction of the first strip-shaped polarizer. It is smaller than the variation in direction. Since the polarizer is manufactured by processing each second strip-shaped polarizer and extracting the polarizer area in each second strip-shaped polarizer, the absorption axis is more accurately oriented in the design direction required for the polarizer as a product. can be manufactured.

In one embodiment, in the cutting process, the first disk roll in which the first strip-shaped polarizing plate is wound in a roll shape is cut at a plurality of locations in the width direction, and the second disk roll in which a plurality of second strip-shaped polarizing plates are each wound in a roll configuration is cut. As such, a plurality of second strip-shaped polarizing plates may be obtained.

In this case, the first raw roll is cut at multiple locations in the width direction to obtain the second raw roll. Therefore, for example, the process of winding up a plurality of second strip-shaped polarizers obtained from the first strip-shaped polarizer into a roll can be omitted, and the polarizing plate can be manufactured while feeding the second strip-shaped polarizer from each obtained second original roll. . Therefore, it is possible to efficiently manufacture a polarizing plate.

In one embodiment, in the above processing step, at least one second strip-shaped polarizer among a plurality of second strip-shaped polarizers may be cut and processed to cut a polarizing plate area from the at least one second strip-shaped polarizer.

In this case, the polarizer can be directly manufactured using at least one second strip-shaped polarizer. Therefore, a polarizing plate can be manufactured efficiently.

In one embodiment, the processing process includes an intermediate cutting process of cutting a polarizer intermediate including a polarizer region from at least one second strip-shaped polarizer among a plurality of second strip-shaped polarizers, and processing the polarizer intermediate cut out in the intermediate cutting process. By doing so, you may have an intermediate processing step of extracting the polarizing plate region from the polarizing plate intermediate.

In this form, a polarizing plate intermediate is cut from at least one second strip-shaped polarizing plate, and a polarizing plate is manufactured from the polarizing plate intermediate.

In the intermediate processing step, the polarizing plate area may be carved out from the polarizing plate intermediate by processing the end surface of the polarizing plate intermediate.

When processing the end surface of the polarizer intermediate in order to carve out the polarizer region from the polarizer intermediate, it is easy to correct the deviation of the direction of the absorption axis with respect to the longitudinal direction of the first strip-shaped polarizer due to the influence of bowing, etc.

In one embodiment, in the cutting process, at least three second strip-shaped polarizing plates may be obtained from the first strip-shaped polarizing plate.

If at least three second strip-shaped polarizers are obtained from the first strip-shaped polarizer, the variation in the absorption axis direction in the width direction can be reduced in each of the second strip-shaped polarizers. Therefore, it is easy to manufacture a polarizing plate whose absorption axis is more accurately oriented in the design direction.

In one embodiment, in the cutting process, the direction of the absorption axis of each second strip-shaped polarizing plate to be obtained is within an allowable range with respect to the direction of the reference absorption axis of each second strip-shaped polarizing plate. The first strip-shaped polarizing plate may be cut at multiple locations in the width direction based on axis angle data showing the distribution of the direction of the absorption axis in the width direction.

In this case, the absorption axis direction in each second strip-shaped polarizing plate can be made substantially the same. Therefore, it is easy to manufacture a polarizer whose absorption axis is more accurately oriented in the design direction.

In one embodiment, the width of the first strip-shaped polarizer may be 1000 mm or more.

If the width of the first strip-shaped polarizer is 1000 mm or more, the influence of boing is likely to increase. Therefore, the above-described manufacturing method that can manufacture a polarizing plate whose absorption axis direction more accurately faces the design direction is effective.

In one embodiment, the planar view shape of the polarizing plate is rectangular or square, and the diagonal length of the polarizing plate may be 350 mm or less, and is usually 12.5 mm or more, preferably 50 mm or more.

Such polarizers tend to be used in small and medium-sized displays that require high contrast. Therefore, the above-described manufacturing method that can manufacture a polarizing plate whose absorption axis direction more accurately faces the design direction is effective.

In one embodiment, the polarizing plate may be a VA type or IPS type polarizing plate for a liquid crystal panel.

In VA type or IPS type liquid crystal display devices, image display with high contrast is possible, and for this reason, there is a tendency for image display with even higher contrast to be required. Therefore, the above-mentioned manufacturing method is effective for obtaining a polarizing plate whose absorption axis direction is precisely oriented in the design direction.

In the method of manufacturing a liquid crystal panel according to another aspect of the present invention, a liquid crystal panel is manufactured by manufacturing a polarizing plate according to the method of manufacturing a polarizing plate according to an aspect of the present invention and bonding the obtained polarizing plate to a liquid crystal cell.

The polarizing plate bonded to the liquid crystal cell using the liquid crystal panel manufacturing method is manufactured using the polarizing plate manufacturing method according to one aspect of the present invention. Therefore, in the manufactured polarizing plate, the absorption axis direction more accurately faces the design direction. Therefore, when displaying images on a liquid crystal panel, image quality can be improved.

According to the present invention, it is possible to provide a method of manufacturing a polarizing plate and a method of manufacturing a liquid crystal panel that can manufacture a polarizing plate whose absorption axis is directed in the design direction.

1 is a perspective view of a polarizing plate schematically showing the configuration of a polarizing plate manufactured by a method of manufacturing a polarizing plate according to an embodiment.
FIG. 2 is a schematic diagram of a first strip-shaped polarizer for manufacturing the polarizer shown in FIG. 1.
FIG. 3(a) shows a process of obtaining a plurality of second disk rolls by cutting the first disk roll on which the first strip-shaped polarizer shown in FIG. 2 is wound at a plurality of locations in the width direction in the method of manufacturing a polarizing plate. It is a drawing, and FIG. 3(b) is a figure showing the state in which the 1st raw material roll is divided into a plurality of 2nd original material rolls by the process shown in FIG. 3(a).
Figure 4(a) is a schematic diagram showing the intermediate cutting process of cutting the polarizer intermediate from the roll on which the second strip-shaped polarizer shown in Figure 3(b) is wound, and Figure 4(b) is shown in Figure 4(a). It is a diagram schematically showing the polarizing plate intermediate cut in the shown intermediate cutting process and the polarizing plate area in the polarizing plate intermediate.
FIG. 5 is a diagram schematically showing the configuration of a liquid crystal panel manufactured by a liquid crystal panel manufacturing method according to an embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention will be described with reference to the drawings. Identical elements are given the same symbol. Redundant explanations are omitted. The dimensional ratios in the drawings do not necessarily match those in the description. In the explanation, words indicating directions such as “up” and “down” are convenient words based on the states shown in the drawings.

(First Embodiment)

The polarizing plate 1 according to one embodiment schematically shown in FIG. 1 has an absorption axis S _A and a transmission axis S _T orthogonal to the absorption axis S _A . The polarizing plate 1 is an optical element with linear polarization characteristics that absorbs light vibrating in the absorption axis ( _SA ) direction and selectively passes light vibrating in the transmission axis (S _T ) direction.

The polarizing plate 1 is applied to, for example, a liquid crystal display device. For example, the polarizer 1 may be bonded to both sides of the liquid crystal cell in an orthogonal Nicol state to form part of the liquid crystal panel. An example of the planar view shape (shape seen in the thickness direction) of the polarizing plate 1 is a rectangle as shown in FIG. 1 or a quadrangular shape called a square. The absorption axis S _A direction of the polarizing plate 1 faces a predetermined direction in the polarizing plate 1.

The predetermined direction of the absorption axis S _A in the polarizing plate 1 is the direction of the absorption axis S _A required in a device (for example, a liquid crystal display device) to which the polarizing plate 1 is applied, and the polarizing plate 1 ) is the design direction of the absorption axis (S _A ), which is designed in advance at the design stage.

The predetermined direction is a direction at a predetermined angle θ from one side of the polarizing plate 1 as a reference side. For example, when the planar shape of the polarizer 1 is rectangular, the predetermined direction is based on the long side, the direction of a predetermined angle (θ = 0°) (i.e., the direction parallel to the long side), and the predetermined angle ( A direction of θ=45°) and a diagonal direction may be exemplified. For simplicity of explanation, hereinafter, unless otherwise specified, the shape of the polarizing plate 1 will be described, which has a rectangular shape in plan view and has a predetermined direction along the long side.

In FIG. 1, for the sake of illustration, the thickness of the polarizing plate 1 is shown to be relatively large. However, usually, the thickness of the polarizing plate 1 is sufficiently smaller than the length of the long and short sides in the plane view of the polarizing plate 1, and the polarizing plate 1 is in a film form.

The size of the polarizer 1 may be set according to the device in which the polarizer 1 is used. An example of the size of the polarizing plate 1 is a polarizing plate whose diagonal length is 12.5 mm to 350 mm, that is, a length corresponding to the so-called 0.5 type to 12 type. When the polarizer 1 is applied to a liquid crystal display device, the liquid crystal panel to which the polarizer 1 is bonded is not particularly limited, but includes, for example, VA (Vertical Alignment) type and IPS (In-Place) type capable of displaying images with high contrast. -Switching type liquid crystal panel and high-definition liquid crystal panel are examples. A high-definition liquid crystal panel is, for example, a liquid crystal panel with a pixel count of 200 ppi (pixel per inch) or more.

The polarizing plate 1 is a laminate having a polarizer film 2a as a polarizing layer that selectively passes light vibrating in one direction. An example of the polarizer film 2a is a film in which a dichroic dye is adsorbed and oriented on a uniaxially stretched resin film. The polarizer film 2a is not particularly limited as long as it is a resin film having linear polarization characteristics, and any one used in a known linear polarizing plate may be used.

Examples of the resin film of the polarizer film 2a include polyvinyl alcohol (hereinafter sometimes referred to as “PVA”)-based resin film, polyvinyl acetate resin film, and ethylene/vinyl acetate (hereinafter sometimes referred to as “EVA”). Yes) Includes resin film, polyamide resin film, and polyester resin film. Usually, PVA-based resin films, especially PVA films, are used from the viewpoint of adsorption and orientation of the dichroic dye. Hereinafter, unless otherwise specified, the resin film included in the polarizer film 2a is described as a PVA film.

The dichroic dye is oriented and adsorbed to the uniaxially stretched resin film in the stretching direction. As a result, the polarizer film 2a has dichroism, that is, polarization characteristics, by absorbing light in the orientation direction of the dichroic dye (i.e., the long axis direction of the molecule) and transmitting light in the direction perpendicular to the orientation direction. Examples of dichroic dyes are iodine and dichroic organic dyes. An example of the thickness of the polarizer film 2a is 1 μm to 30 μm.

On both sides of the polarizer film 2a, protective films 2b and 2c are bonded as protective layers for protecting the polarizer film 2a. Examples of the protective films 2b and 2c include triacetylcellulose (hereinafter also referred to as “TAC”)-based film, polyethylene terephthalate film, nylon film, polycarbonate film, and polyethylene film. Usually, TAC-based films with small optical anisotropy, especially TAC films, are used. Examples of the thickness of the protective films 2b and 2c are 10 μm to 200 μm. The protective films 2b and 2c are usually laminated on the polarizer film 2a through an adhesive layer.

The polarizer 1 is not limited to a form in which the protective films 2b and 2c are laminated on the polarizer film 2a, and a protective film (e.g., protective film 2b) is placed on one of both sides of the polarizer film 2a. It would be good if it was laminated.

A surface protection film (or protection film) 2d that protects the protective film 2b may be bonded to the protective film 2b. An example of the thickness of the surface protection film 2d is 30 μm to 100 μm. Examples of materials for the surface protection film 2d are polyethylene, polypropylene, and polyester.

Additionally, an adhesive layer 2e for bonding the polarizing plate 1 as a product to another member such as a liquid crystal cell may be bonded to the protective film 2c. An example of the thickness of the adhesive layer 2e is 3 μm to 30 μm. Examples of adhesives constituting the adhesive layer 2e include acrylic adhesives, urethane adhesives, and silicone adhesives.

In the form in which the adhesive layer 2e is bonded, a separate film 2f may be bonded in a peelable manner on the adhesive layer 2e. The separate film 2f is a film to prevent other areas of the first strip-shaped polarizer 10 and dust from attaching to the adhesive layer 2e until the polarizer 1 as a product is used. An example of the thickness of the separate film 2f is 30 μm to 100 μm.

The adhesive layer 2e and the separate film 2f are provided on the protective film 2c, for example, by bonding the separate film 2f with the adhesive layer 2e formed on the surface to the protective film 2c.

The polarizing plate 1 is manufactured from the first strip-shaped polarizing plate 10 shown in FIG. 2. FIG. 2 is a schematic diagram of a first strip-shaped polarizer for manufacturing the polarizer shown in FIG. 1.

An example of the length of the first strip-shaped polarizing plate 10 in the longitudinal direction is 100 m to 3000 m, and the first strip-shaped polarizing plate 10 is wound in a roll shape. The first strip-shaped polarizing plate roll in which the first strip-shaped polarizing plate 10 is wound around the core C, which is the winding axis, is called the first disk roll 11. An example of the width of the first strip-shaped polarizer 10 is 1000 mm or more. Usually, the width of the first strip-shaped polarizer 10 is 3000 mm or less.

The first strip-shaped polarizing plate 10 has the same layer structure as the polarizing plate 1 shown in FIG. 1. That is, the first strip-shaped polarizer 10 has a polarizer film 2a, and protective films 2b and 2c as protective layers for protecting the polarizer film 2a are bonded to both sides of the polarizer film 2a. . A surface protection film 2d may be bonded to the protective film 2b. Additionally, an adhesive layer 2e is formed on the protective film 2c, and a separate film 2f may be bonded on the adhesive layer 2e in a peelable manner.

The first strip-shaped polarizer 10 is manufactured as follows, for example. A strip-shaped raw material resin film is uniaxially stretched in its longitudinal direction (stretching process). An example of a raw resin film is a PVA film that is unstretched, that is, has no orientation. An example of a stretching ratio is 4 to 5 times. The method of uniaxial stretching may be either a dry uniaxial stretching method or a wet uniaxial stretching method. Uniaxial stretching can be realized, for example, by stretching the raw material resin film by adding tension in the longitudinal direction while contacting the raw material resin film with a heat roll.

After the raw material resin film is uniaxially stretched, the PVA film, which is the raw material resin film after uniaxial stretching, is immersed in an aqueous solution containing a dichroic dye (dyeing process). In this way, the dichroic dye is adsorbed and oriented on the PVA film to dye the PVA film. In this way, the polarizer film 2a is obtained by going through the stretching process and dyeing process. Therefore, the stretching process and dyeing process constitute a polarizer film manufacturing process.

Next, the protective films 2b and 2c are respectively bonded to both sides of the polarizer film 2a (protective film lamination process). Thereafter, the first strip-shaped polarizing plate 10 is obtained by laminating the surface protection film 2d, the adhesive layer 2e, and the separate film 2f according to the layer structure of the polarizing plate 1 to be manufactured.

In the illustrated method of manufacturing the first strip-shaped polarizing plate 10, the dichroic dye is adsorbed and oriented in the PVA film after uniaxially stretching the raw material resin film. However, the raw material resin film may be uniaxially stretched while or after the dichroic dye is being adsorbed and oriented.

The polarizer film 2a of the first strip-shaped polarizer 10 is uniaxially stretched in the longitudinal direction of the first strip-shaped polarizer 10. Therefore, in the first strip-shaped polarizer 10, the absorption axis S _A direction substantially coincides with the longitudinal direction of the first strip-shaped polarizer 10.

However, when uniaxially stretched, bowing may occur in which the edge portion in the width direction is slightly curved inward. Therefore, as illustrated in FIG. 2 , in the width direction of the first strip-shaped polarizer 10, the absorption axis S _A direction may deviate from the longitudinal direction. The magnitude of the shift angle from the longitudinal direction in the absorption axis S _A direction is, for example, about 0.2° to 0.3°. In Figure 2, this shift angle is drawn exaggerated. The shift angle with respect to the longitudinal direction of the absorption axis S _A due to bowing tends to change continuously in the width direction of the first strip-shaped polarizer 10.

Normally, in the manufacturing process of the first strip-shaped polarizer 10, the shift angle from the longitudinal direction in the width direction of the absorption axis S _A as described above is detected, and the absorption axis S in the width direction is detected. _A ) It is acquired as axis angle data. The axis angle data is information about the distribution in the width direction of the first strip-shaped polarizer 10 of the inclination angle of the absorption axis (S _A ) direction with respect to the reference direction called the longitudinal direction.

In this way, when acquiring the axis angle data of the absorption axis (S _A ), in manufacturing the first strip-shaped polarizer 10, a detection process of the absorption axis direction for acquiring the axis angle data of the absorption axis (S _A ) is performed. have This detection process may be performed, for example, after producing the polarizer film 2a but before the process of bonding the protective films 2b and 2c to the polarizer film 2a. ) may be performed after the joining process.

Next, a method for manufacturing the polarizing plate 1 shown in FIG. 1 using the first strip-shaped polarizing plate 10 shown in FIG. 2 will be described.

When manufacturing the polarizing plate 1, as shown in (a) of FIG. 3, the first raw roll 11 is cut at a plurality of locations in the width direction of the first raw roll 11, As shown in (b), a plurality of second raw rolls 13 ₁ , 13 ₂ , ..., 13 _N (N is an integer of 2 or more) are obtained (cutting process). In Fig. 3(a), the cutting position of the first disk roll 11 is schematically indicated by a two-dashed chain line. In FIGS. 3(a) and 3(b), the first disk roll 11 is cut at four locations to form five second disk rolls 13 ₁ , 13 ₂ , 13 ₃ , 13 ₄ , and 13 _5. ) is an example of the form of obtaining.

For example, the first raw roll 11 may be cut while sequentially moving the cutting blade 20 (see Fig. 3(a)) to the cutting position. Alternatively, the first disk roll 11 may be cut at a time with a plurality of cutting blades 20 arranged according to the cutting position. The cutting blade 20 in Figure 3(a) is schematically shown, and an example of the cutting blade 20 is a chip saw.

The second raw rolls 13 ₁ , 13 ₂ , …, 13 _N obtained in the cutting process of cutting the first raw roll 11 in the width direction have a width narrower than the width of the first strip-shaped polarizing plate 10. It is a second strip-shaped polarizer roll on which 2 strip-shaped polarizers (12 ₁ , 12 ₂ , ..., 12 _N ) are wound. When cutting the first raw roll 11, the core C, which is the axis of winding the first strip polarizer 10, may be cut together, or the core C may be cut without cutting the first strip polarizer 10. ) may be cut only. In Figure 3(b), the core C is omitted.

The cutting width when cutting the first raw roll 11 is the width of the second strip-shaped polarizing plate 12 ₁ to 12 _N that must be divided from the first raw roll 11, and is equal to the width of the first strip-shaped polarizing plate 10. It is narrower than the width and is a width that can include the area that should be the polarizer 1 so that the polarizer 1 can be manufactured with the second strip-shaped polarizer 12 ₁ to 12 _N. The area that should become the polarizer 1 may be the polarizer area 31, which will be described later. The cutting width, that is, the width of the second disk rolls 13 ₁ to 13 _N , may be different from each other.

The cutting width when cutting the first raw roll 11 is based on the axis angle data, which is data of the angle distribution in the direction of the absorption axis S _A in the width direction of the first strip-shaped polarizing plate 10. In the second strip-shaped polarizers 12 ₁ to 12 _N , the directions of the absorption axes S _A are set to substantially coincide.

That the directions of the absorption axes S _A are substantially identical means that, for example, as shown in FIG. 3(b), in each of the second strip-shaped polarizers 12 ₁ to 12 _N , the absorption axis ( It means that the angular distribution of the direction of the absorption axis (S _A ) with respect to the direction S _A ) [hereinafter also referred to as the reference absorption axis (S _{A_B} )] is within the allowable range. The allowable range may be determined depending on the polarizer 1 to be manufactured, but is, for example, approximately ±0.1° relative to the reference absorption axis (S _{A_B} ).

For example, when cutting the first raw roll 11, the direction of the absorption axis _S A at a plurality of predetermined positions in the width direction of the first strip-shaped polarizer 10 is the reference absorption axis S _{A_B} direction. , and the width of the area where the variation angle width in the absorption axis (S _A ) direction with respect to the reference absorption axis (S _{A_B} ) direction is within the allowable range can be set as the cutting width.

As described above, the cutting width of the first raw roll 11 is a width that includes the area that must be the polarizing plate 1 so that the polarizing plate 1 can be manufactured with the second strip-shaped polarizing plate 12 ₁ to 12 _N. Therefore, the distance between adjacent predetermined positions in the plurality of predetermined positions that set the reference absorption axis (S _{A_B} ) direction is the size in the width direction of the first raw roll 11 in the polarizing plate area 31 to be described later [polarizing plate The length of the region 31 projected in the width direction] or more.

After obtaining a plurality of second raw rolls 13 ₁ to 13 _N , the second strip-shaped polarizing plates 12 ₁ to 12 _N constituting the second raw rolls 13 ₁ to 13 _N are processed to obtain a polarizing plate as a product ( 1) Perform the processing process to manufacture. This processing process will be described as an example of manufacturing the polarizing plate 1 with the second raw roll 13 ₁ .

As shown in Fig. 4(a), the second strip-shaped polarizing plate 12 ₁ is fed from the second disk roll 13 ₁ and the polarizing plate intermediate 30 is cut (intermediate cutting process). The polarizing plate intermediate 30 is conveyed in the feeding direction (longitudinal direction) of the second strip-shaped polarizing plate 12 ₁ , according to the size of the polarizing plate 1 manufactured from the second strip-shaped polarizing plate 12 ₁ . (12 ₁ ) is cut by cutting a predetermined position in the longitudinal direction with the cutting blade 21.

The polarizer intermediate 30 may be of a size that includes the polarizer region 31 corresponding to the product size of the polarizer 1, as schematically shown by the broken line in Figure 4 (b), as described later. It may be a size that includes a processing allowance due to side surface processing.

After that, the polarizing plate intermediate 30 is processed, and the polarizing plate region 31 is taken out to obtain the polarizing plate 1. An intermediate processing step is performed. Taking out the polarizer region 31 from the polarizer intermediate 30 means separating or deleting regions other than the polarizer region 31 of the polarizer intermediate 30 from the polarizer region 31.

Hereinafter, an end surface processing process as an example of the intermediate processing process will be described. In the end surface processing process, the end surfaces 30a, 30b, 30c, and 30d of the polarizer intermediate 30 are processed (end surface processing), and the polarizer region 31 is shaved from the polarizer intermediate 30, thereby reducing the product size. Obtain a polarizer (1). An example of end surface processing is cutting processing to cut the end surfaces 30a to 30d, and the cutting processing also includes polishing processing to polish the end surfaces 30a to 30d.

The polarizing plate area 31 is set so that the direction of the absorption axis S _A of the polarizing plate area 31 is the design direction (predetermined direction) of the absorption axis S _A in the polarizing plate 1. Therefore, for example, like the second strip-shaped polarizer 12 ₁ , the direction of the absorption axis S _A is relative to the longitudinal direction of the second strip-shaped polarizer 12 ₁ (the direction indicated by the dashed line in Fig. 4(b)). When tilted at a certain angle, the polarizer region 31 is also tilted with respect to the longitudinal direction of the polarizer intermediate 30, as shown in FIG. 4(b). Therefore, the width of the second strip-shaped polarizing plate 12 ₁ is at least longer than the width of the polarizing plate area 31 (short side direction in Fig. 4(a)).

The direction of the absorption axis S _A used to set the polarizer area 31 is the direction of the absorption axis S _A of the second strip polarizer 12 ₁ , for example, the second strip polarizer 12 ₁ ) may be the direction of the reference absorption axis (S _{A_B} ). As described above, the second raw roll 13 ₁ is the first raw roll 11 based on the axis angle data of the absorption axis S _A in the width direction of the first strip-shaped polarizer 10, It is cut and manufactured so that the absorption axis (S _A ) direction is substantially consistent. Therefore, the direction of the absorption axis S _A used to set the polarizing plate area 31 is known.

In the end surface machining process of processing the end surfaces 30a to 30d of the polarizer intermediate 30, the end surfaces 30a to 30d of the polarizer intermediate 30 are cut or polished with a cutting blade to form the polarizer intermediate 30. ), the polarizing plate 1 as a product is obtained by cutting off the polarizing plate area 31. In the end surface processing step, for example, the end surface processing of the plurality of polarizing plate intermediates 30 may be performed integratedly using a laminate formed by stacking the plurality of polarizing plate intermediates 30.

Although the method of manufacturing the polarizing plate 1 with the second raw roll 13 ₁ has been described, the case of manufacturing the polarizing plate 1 with other second raw rolls 13 ₂ , 13 ₃ , ..., 13 _N is the same. do. The size and shape of the polarizing plate 1 manufactured from each of the second raw rolls 13 ₁ to 13 _N may be different. Therefore, the cutting width when dividing the second film rolls 13 ₁ to 13 _N from the first film roll 11 is that of the polarizing plate 1 manufactured from the second film rolls 13 ₁ to 13 _N. It is set based on the size, shape, and axis angle data of the absorption axis S _A in the first strip-shaped polarizer 10.

In the first strip-shaped polarizing plate 10 constituting the first raw roll 11, distribution in the direction of the absorption axis S _A is generated in the width direction due to the influence of bowing, as illustrated in FIG. 2 . For example, in the central portion of the first strip-shaped polarizer 10 in the width direction, the absorption axis S _A direction is approximately parallel to the longitudinal direction of the first strip-shaped polarizer 10, while in the vicinity of the edge portion, the first strip-shaped polarizer 10 A slight deviation (for example, 0.2° to 0.3°) occurs with respect to the longitudinal direction of the polarizing plate 10.

In the above manufacturing method, the first raw roll 11 is cut at multiple locations in the width direction to produce second strip-shaped polarizing plates 12 ₁ to 12 _N having a width narrower than the width of the first strip-shaped polarizing plate 10. I'm doing it. And, based on the absorption axis _SA direction in each of the second strip-shaped polarizers 12 ₁ to 12 _N , the absorption axis _SA direction is a predetermined direction required for the polarizer 1 as a product. The polarizer 1 is manufactured to face the (design direction).

Since the width of the second strip-shaped polarizers 12 ₁ to 12 _N is narrower than the width of the first strip polarizer 10, the absorption axis S _A direction in each of the second strip polarizers 12 ₁ to 12 _N The change in is small. And, since the polarizing plate 1 is manufactured with each of the second strip-shaped polarizing plates 12 ₁ to 12 _N based on the respective absorption axis _SA directions, the absorption required for the polarizing plate 1 as a product is achieved. It is possible to manufacture the polarizing plate 1 in which the absorption axis S _A is oriented with greater precision with respect to the predetermined direction of the axis S _A.

In the above-described manufacturing method, the cutting width when cutting the first raw roll 11 into a round shape is set based on the axis angle data of the absorption axis S _A in the width direction of the first strip-shaped polarizing plate 10. I'm doing it. Specifically, the cutting width is set so that the variation width in the absorption axis S _A direction is within the allowable range with respect to the plurality of reference absorption axis S _{A_B} directions using axis angle data. Therefore, the directions of the absorption axes S _A in each of the second strip-shaped polarizers 12 ₁ to 12 _N are likely to substantially coincide. Therefore, it is easy to manufacture the polarizing plate 1 in which the absorption axis S _A faces a predetermined direction with higher precision.

The second strip-shaped polarizers 12 ₁ to 12 _N are formed by cutting the first disk roll 11 into a round shape, thereby forming the second disk rolls 13 ₁ to 13 in which the second strip polarizers 12 ₁ to 12 _N are already wound. _N ) is produced as. Therefore, the polarizing plate 1 can be manufactured using the second disk rolls 13 ₁ to 13 _N without going through the process of rewinding the second strip-shaped polarizing plate 12 ₁ to 12 _N into a roll shape. Therefore, the polarizing plate 1 can be manufactured more efficiently. In addition, since a device for rewinding the second strip-shaped polarizing plates 12 ₁ to 12 _N into a roll is not necessary, the manufacturing cost of the polarizing plate 1 can be reduced.

In the above manufacturing method, when the polarizing plate 1 is cut out from the polarizing plate intermediate 30, the absorption axis S _A in the polarizing plate area 31 is in the design direction of the absorption axis S _A in the polarizing plate 1. The polarizer area 31 is set to face . As a result, the deviation from the longitudinal direction of the first strip-shaped polarizer 10 in the absorption axis S _A direction due to bowing can be corrected more reliably. As a result, it is possible to manufacture _{a polarizing plate 1 in which the deviation between the direction of the absorption axis S A and} the predetermined direction required for the polarizing plate 1 as a product is smaller.

In the polarizing plate 1 applied to VA type and IPS type liquid crystal panels capable of displaying images with high contrast, the absorption axis S _A direction is aligned with the direction of the polarizing plate 1 for displaying images with high contrast. It has been demanded that it matches the design direction (predetermined direction) with high precision. Therefore, the above manufacturing method capable of manufacturing the polarizing plate 1 in which the absorption axis S _A direction can more accurately match the design direction is effective for manufacturing polarizing plates for VA type and IPS type liquid crystal panels. . If the liquid crystal panel is VA type, it may be ASV (Advanced Super View) type.

Similarly, a polarizing plate applied to a liquid crystal panel capable of displaying high-definition images is required to have the direction of the absorption axis S _A match the predetermined direction required for the polarizing plate 1 as a product with high precision. Therefore, the above manufacturing method, which can manufacture the polarizing plate 1 whose absorption axis ( _SA ) direction can more accurately match the design direction, is effective for manufacturing a polarizing plate used in a liquid crystal panel capable of displaying high-definition images. do.

Unlike large-screen TVs with large screen sizes, displays for small and medium-sized portable devices of 12 inches (diagonal length 350 mm) or less require high contrast because users tend to view the screen from a close distance. Therefore, the above manufacturing method, which can manufacture the polarizing plate 1 whose absorption axis S _A direction can more accurately match the design direction, is effective for manufacturing a polarizing plate used in displays for small and medium-sized portable devices.

When viewed from the plane of the polarizer 1, the shape is rectangular or square, and the diagonal length is 12.5 mm to 350 mm, so-called 0.5 to 12 types, and the length corresponding to type 2 (diagonal length 50 mm) or more. In this case, the polarizing plate 1 is easily used in displays for small and medium-sized portable devices, etc. Therefore, the above manufacturing method capable of manufacturing the polarizing plate 1 whose absorption axis (S _A ) direction can more accurately match the design direction has a rectangular or square shape in plan view and a diagonal length of 12.5 mm to 350 mm. It is effective for polarizers measuring ㎜.

In a form in which the width of the first strip-shaped polarizer 10 is 1000 mm or more, the influence of the boing described above tends to increase. Therefore, when manufacturing a polarizer with the first strip-shaped polarizer 10 having a width of 1000 mm or more, usually 3000 mm or less, the direction of the absorption axis S _A can more accurately match the design direction. The manufacturing method of (1) is effective.

(Second Embodiment)

As a second embodiment, a method for manufacturing a liquid crystal panel using the polarizing plate 1 will be described. Hereinafter, for convenience of explanation, in the polarizing plate 1 having the layer structure shown in FIG. 1, the polarizing plate 1 from which the separate film 2f has been peeled is also referred to as the polarizing plate 1A.

As schematically shown in FIG. 5 , the liquid crystal panel 3 is configured by bonding a polarizing plate 1A obtained by peeling a separate film 2f from the polarizing plate 1 to both surfaces of the liquid crystal cell 4 . The liquid crystal cell 4 may be any one used in known liquid crystal panels. For example, the liquid crystal cell 4 may be one in which a transparent electrode, an alignment film, a liquid crystal, an alignment film, a transparent electrode, a color filter, and a glass substrate are provided in that order on a glass substrate. Examples of driving methods for the liquid crystal cell 4 are VA type and IPS type. An example of the number of pixels of the liquid crystal cell 4 is 100 ppi or more.

The liquid crystal panel 3 is manufactured as follows, for example. That is, the polarizing plate 1 is manufactured according to the polarizing plate manufacturing method described in the first embodiment (polarizing plate manufacturing process). Next, the polarizing plate 1 is bonded to both sides of the liquid crystal cell 4 to obtain the liquid crystal panel 3 (polarizing plate bonding process).

In the polarizing plate bonding process, the separate film 2f of each polarizing plate 1 is peeled, and the polarizing plate 1A from which the separate film 2f has been peeled is bonded to the liquid crystal cell 4 through the adhesive layer 2e. When bonding the polarizing plate 1 to both sides of the liquid crystal cell 4, the two polarizing plates 1A are bonded to the liquid crystal cell 4 so that the two polarizing plates 1 are in an orthogonal Nicol state.

In the manufacturing method of the liquid crystal panel 3, the polarizing plate 1 that becomes the polarizing plate 1A of the liquid crystal panel 3 is manufactured by the manufacturing method illustrated in the first embodiment. Therefore, in the polarizing plate 1, the absorption axis S _A is oriented more accurately in the predetermined direction of the absorption axis S _A required by the liquid crystal panel 3. Therefore, when displaying images in the manufactured liquid crystal panel 3, image quality can be improved.

Additionally, when the liquid crystal cell 4 used in manufacturing the liquid crystal panel 3 is either a VA type liquid crystal cell 4 or an IPS type liquid crystal cell 4, image display with high contrast is possible. Therefore, by applying the polarizing plate 1A in which the direction of the absorption axis S _A is oriented more accurately in the predetermined direction required for the liquid crystal panel 3, the image quality in the liquid crystal panel 3 can be further improved. It can be promoted. Similarly, when the number of pixels in the liquid crystal cell 4 is 200 ppi or more, a high-definition image can be displayed. Therefore, by applying the polarizing plate 1A in which the direction of the absorption axis S _A is oriented more accurately in the predetermined direction required for the liquid crystal panel 3, the image quality in the liquid crystal panel 3 can be further improved. It can be promoted.

The polarizing plate 1 manufactured according to the polarizing plate manufacturing method described in the first embodiment may have at least one of the polarizer film 2a and the protective films 2b and 2c. However, the polarizing plate 1 usually has an adhesive layer 2e for bonding to the liquid crystal cell 4. When the polarizing plate 1 manufactured according to the method for manufacturing a polarizing plate described in the first embodiment does not have the adhesive layer 2e, the polarizing plate 1 and the liquid crystal cell 4 may be bonded, for example, with an adhesive, and the liquid crystal cell ( 4) An adhesive layer may be provided on the side.

Although various embodiments of the present invention have been described above, it is not limited to the various embodiments illustrated, but is indicated by the claims, and all changes within the meaning and scope of equivalence to the claims are included. It is intended.

For example, in the method for manufacturing the polarizing plate 1 illustrated in the first embodiment, end surface processing was performed on the polarizing plate intermediate 30 to manufacture the polarizing plate 1 as a product. However, the area other than the polarizing plate area 31 may be directly extracted from the second strip-shaped polarizing plate 12 ₁ to 12 _N by separating or deleting it from the polarizing plate area 31. For example, a cutting process of directly cutting the polarizing plate area 31 from the second strip-shaped polarizing plates 12 ₁ to 12 _N may be performed on the second strip-shaped polarizing plates 12 ₁ to 12 _N. Examples of cutting processing methods when performing such cutting processing include punching with a blade mold and laser cutting using a laser beam.

The intermediate cutting process, which is a process for taking out the polarizing plate 1 from the polarizing plate intermediate 30, is not limited to end surface processing using cutting processing (including polishing processing), and punching into a blade mold and laser beam processing. You may also use laser cutting. In addition, in the process of cutting the polarizing plate intermediate 30 from the second strip-shaped polarizing plate 12 ₁ to 12 _N , for example, laser cutting may be used.

The method of manufacturing the polarizing plate 1 from the second strip-shaped polarizing plates 12 ₁ to 12 _N does not need to be the same for all the second strip-shaped polarizing plates 12 ₁ to 12 _N. For example, the polarizer 1 is manufactured by cutting the polarizer area 31 directly from at least one of the second strip-shaped polarizers 12 ₁ to 12 _N , while the polarizer 1 is manufactured by cutting the polarizer area 31 directly from at least one of the second strip-shaped polarizers 12 ₁ to 12 _N. ) After producing the polarizing plate intermediate 30 with the remaining second strip-shaped polarizing plate, the polarizing plate 1 may be taken out from the polarizing plate intermediate 30.

For example, at the central portion in the width direction of the first strip-shaped polarizer 10, the absorption axis S _A direction is substantially the longitudinal direction. Therefore, it may be said that the width of the second strip-shaped polarizer cut from the central portion in the width direction of the first strip-shaped polarizer 10 is equal to the width of the polarizer region 31.

In this case, in the processing step of obtaining the polarizing plate 1 by processing the plurality of second strip-shaped polarizers 12 ₁ to 12 _N , at least the polarizer region 31 among the plurality of second strip-shaped polarizers 12 ₁ to 12 _N For the second strip-shaped polarizer having a width equal to that of Among the second strip-shaped polarizers 12 ₁ to 12 _N , the second strip-shaped polarizer having a width longer than the width of the polarizer region 31 is formed by using the second strip-shaped polarizer as the polarizer 1 in the same manner as illustrated so far. ) is good to manufacture.

The polarizing plate area 31 set in the width direction of the second strip-shaped polarizing plate 12 ₁ to 12 _N is not limited to one. A plurality of polarizing plate regions 31 may be set in the width direction of the second strip-shaped polarizing plates 12 ₁ to 12 _N.

3(a) and 3(b) illustrate a form in which the first disk roll 11 is divided into five second disk rolls 13 ₁ to 13 5, but the second disk roll 13 is divided into five second disk rolls 13 1 to 13 ₅ . The number is not limited to 5 (i.e., N=5). The first disk roll 11 may be formed of a plurality of second disk rolls whose width is narrower than that of the first disk roll 11 . For example, by cutting the first raw roll 11 with a constant cutting width from each of both edge portions in the width direction of the first raw roll 11, the vicinity of both edge portions in the width direction of the first raw roll 11 You may produce two second disk rolls and one second disk roll between them. In this case, three second disk rolls are manufactured from one first disk roll 11.

As schematically shown in FIG. 2, in the width direction of the first strip-shaped polarizer 10, the influence of bowing is greater near both edges than near the center. Therefore, in the width direction of the first strip-shaped polarizer 10, the deviation between the direction of the absorption axis S _A near the center and the direction of the absorption axes S _A near both edges increases.

However, the variation in the direction of the absorption axis S _A in the area near the center and the variation in the direction of the absorption axis S _A in the area near both edges are small. Therefore, if the first strip-shaped polarizer 10 is divided in the width direction into three second strip-shaped polarizers near both edges and near the center, there are three second strip-shaped polarizers with small variations in the direction of the absorption axis in the width direction. It is possible to obtain a second strip-shaped polarizer.

The greater the number of second strip-shaped polarizers divided from the first strip-shaped polarizer 10, that is, the larger the number of cut points in the width direction of the first strip-shaped polarizer 10, the more the second strip-shaped polarizer with the absorption axis direction coincides. can be obtained. From this point of view, it is preferable to have five or more second strip-shaped polarizers.

When obtaining a plurality of second strip-shaped polarizers 12 ₁ to 12 _N from the first strip-shaped polarizer 10, the first disk roll 11 was cut into circles to obtain second disk rolls 13 ₁ to 13 _N. . However, the first strip-shaped polarizer 10 is fed from the first raw roll 11, and the first strip-shaped polarizer 10 is cut into slits at a plurality of locations in the width direction of the first strip-shaped polarizer 10, A plurality of second strip-shaped polarizing plates 12 ₁ to 12 _N may be obtained.

In this case, usually, the obtained second strip-shaped polarizing plate 12 ₁ to 12 _N is wound again into a roll to produce a second disk roll 13 ₁ to 13 _N . In this way, when the second raw rolls 13 ₁ to 13 _N are manufactured, the process after production of the second raw rolls 13 ₁ to 13 _N is the process described using FIG. 4(a). Same as

The determination of the direction of the absorption axis S _A used when setting the polarizing plate area 31 is, for example, not limited to that based on the axis angle data of the absorption axis S _A in the first strip-shaped polarizing plate 10. Alternatively, the direction of the absorption axis S _A in the polarizing plate intermediate 30 may be detected, and the direction may be based on the detection result. Alternatively, it may be determined based on the empirical distribution of the absorption axis ( _SA ) direction in the first strip-shaped polarizer 10.

When manufacturing the polarizer 1 by processing each of the second strip-shaped polarizers (12 ₁ to 12 _N ), for example, the polarizer intermediate 30 is cut from each of the second strip-shaped polarizers (12 ₁ to 12 _N ) to form the polarizer intermediate. The polarizing plate (1) may be manufactured by processing (30).

The cutting width when dividing the first strip polarizer 10 into a plurality of second strip polarizers 12 ₁ to 12 _N is the axis angle data in the absorption axis S _A direction of the first strip polarizer 10. It doesn't have to be based on . By dividing the first strip polarizer 10 into a plurality of second strip polarizers 12 ₁ to 12 _N , the absorption axis S _A in the width direction of each second strip polarizer 12 ₁ to 12 _N Since the variation in direction is smaller than the variation in the direction of the absorption axis (S _A ) in the first strip-shaped polarizer (10), it is possible to manufacture a polarizing plate (1) with the absorption axis (S _A ) facing the desired direction with higher precision. You can.

In this case, when manufacturing the first strip-shaped polarizer 10, it is not necessary to detect the axis angle data of the absorption axis S _A. In addition, when manufacturing the polarizer 1 with the second strip-shaped polarizer (12 ₁ to 12 _N ), the direction of the absorption axis (S _A ) of the second strip-shaped polarizer (12 ₁ to 12 _N ) is detected, and the detection result may be used as the direction of the absorption axis S _A of the polarizer region 31.

The planar shape of the polarizing plate 1 is exemplified as a rectangular or square shape, but it is not limited to a square shape and may be circular.

Examples of the driving method of the liquid crystal panel to which the polarizer 1 is applied are not limited to the VA type and the IPS type. For example, the driving method of the liquid crystal panel to which the polarizer 1 is applied may be a TN (Twisted Nematic) method.

One… Polarizer, 10… First strip polarizer, 11... First disk roll, 12 ₁ to 12 _N ... Second strip polarizer, 13 ₁ to 13 _N ... Second disk roll, 30... Polarizer intermediate, 30a∼30d… End surface of polarizer intermediate, 31... Polarizer area, 3… Liquid crystal panel, 4… Liquid crystal cell.

Claims (11)

As a method of manufacturing a polarizer having an absorption axis,
A cutting step of cutting the first strip polarizing plate at a plurality of places in the width direction to obtain a plurality of second strip polarizing plates having a width narrower than the width of the first strip polarizing plate;
A polarizer region in the second strip polarizer corresponding to the polarizer to be manufactured, wherein the direction of the absorption axis in the polarizer region is based on the direction of the absorption axis in the second strip polarizer. A processing process of obtaining a polarizing plate by processing each of the second strip-shaped polarizing plates and extracting the area of the polarizing plate facing the design direction of the absorption axis.
Including,
The processing process is,
An intermediate cutting process of cutting a polarizer intermediate including the polarizer region from at least one second strip-shaped polarizer among the plurality of second strip-shaped polarizers;
An intermediate processing process of extracting the polarizer region from the polarizer intermediate by processing the polarizer intermediate cut in the intermediate cutting process.
With
In the intermediate cutting process, the polarizing plate intermediate is cut by cutting at least one second strip-shaped polarizing plate at a predetermined position in the longitudinal direction,
In the intermediate processing step, the polarizing plate area is shaved off from the polarizing plate intermediate by processing an end surface of the polarizing plate intermediate. According to paragraph 1,
In the cutting process, the first film roll in which the first strip-shaped polarizing plate is wound in a roll shape is cut at a plurality of locations in the width direction, and the plurality of second strip-shaped polarizing plates are formed as second film rolls in which each strip-shaped polarizing plate is wound in a roll shape. 2. Method for manufacturing a polarizing plate to obtain a strip-shaped polarizing plate. delete delete delete According to claim 1 or 2,
In the cutting process, at least three of the second strip-shaped polarizing plates are obtained from the first strip-shaped polarizing plate. According to claim 1 or 2,
In the cutting process, the direction of the absorption axis of each of the second strip-shaped polarizers to be obtained is within an allowable range with respect to the direction of the reference absorption axis of each of the second strip-shaped polarizers, in the width direction of the first strip-shaped polarizer. A method of manufacturing a polarizing plate, wherein the first strip-shaped polarizing plate is cut at a plurality of locations in the width direction based on axis angle data showing the distribution of the direction of the absorption axis. According to claim 1 or 2,
A method of manufacturing a polarizing plate, wherein the width of the first strip-shaped polarizing plate is 1000 mm or more. According to claim 1 or 2,
The planar shape of the polarizer is rectangular or square,
A method of manufacturing a polarizing plate, wherein the diagonal length of the polarizing plate is 350 mm or less. According to claim 1 or 2,
A method of manufacturing a polarizing plate, wherein the polarizing plate is a polarizing plate for a VA type or IPS type liquid crystal panel. A method for manufacturing a liquid crystal panel, wherein a liquid crystal panel is manufactured by manufacturing a polarizing plate according to the manufacturing method of the polarizing plate according to claim 1 or 2, and bonding the obtained polarizing plate to a liquid crystal cell.