JP2018141906A - Method for manufacturing polarizing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a polarizing plate with which a polarizing plate can be manufactured in which the direction of an absorption axis is directed more precisely in a designed direction, and a method for manufacturing a liquid crystal panel.SOLUTION: A method for manufacturing a polarizing plate according to one embodiment is a method for manufacturing a polarizing plate 1 having an absorption axis S, and includes: a cutting step of cutting a first belt-like polarizing plate 10 at a plurality of points in a width direction to obtain a plurality of second belt-like polarizing plates 12to 12(N is an integer of 2 or more) having a width smaller than the width of the first belt-like polarizing plate; and a processing step of processing each of the second belt-like polarizing plates to extract a polarizing plate area 31 in the second belt-like polarizing plate corresponding to a polarizing plate to be manufactured, the polarizing plate area in which the direction of the absorption axis in the polarizing plate area is directed in a designed direction of an absorption axis in the polarizing plate to be manufactured on the basis of the direction of the absorption axis in the second belt-like polarizing plate, to obtain the polarizing plate.SELECTED DRAWING: Figure 3

Description

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

  As a polarizing plate, a linear polarizing plate having an absorption axis and a transmission axis perpendicular to the absorption axis, absorbing light oscillating in the absorption axis direction and transmitting light oscillating in the transmission axis direction is known. Yes. 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 band-shaped polarizing plate is manufactured by, for example, laminating protective films on both sides or one side of a band-shaped polarizer film. A strip-shaped polarizer film is usually produced by uniaxially stretching a strip-shaped raw material resin film in the longitudinal direction. In such a manufacturing method, the direction of the absorption axis of the band-shaped polarizing plate is parallel to the direction in which the raw resin film is stretched in uniaxial stretching. And since uniaxial stretching of a raw material resin film is performed in a longitudinal direction, it is assumed that the longitudinal direction of a strip | belt-shaped polarizing plate corresponds with the absorption-axis direction. Therefore, a polarizing plate is manufactured from the strip-shaped polarizing plate so that the absorption axis of the polarizing plate faces a predetermined direction in the polarizing plate with respect to the longitudinal direction of the strip-shaped polarizing plate. Conventionally, the polarizing plate manufactured in this way has endured practical use even when applied to, for example, a liquid crystal display device.

JP-A-11-231129 Japanese Patent Laid-Open No. 11-2724

  When a polarizing plate is manufactured assuming that the longitudinal direction of the strip-shaped polarizing plate is the direction of the absorption axis, actually, the predetermined direction of the absorption axis required for the polarizing plate as a product and the actual absorption axis of the polarizing plate It has been found that there is a case where a slight deviation (for example, about 0.2 ° to 0.3 °) may occur between the first and second directions. Such a shift is considered to be caused by a shift generated between the stretching direction when the raw resin film is uniaxially stretched in the production of a strip-shaped polarizing plate to be a polarizing plate and the longitudinal direction of the strip-shaped polarizing plate. On the other hand, in recent years, for example, higher contrast is demanded in displays for small and medium-sized portable devices. When contrast increases in a display or the like, if there is a slight shift between the specified absorption axis direction required for the product polarizing plate and the actual absorption axis direction of the polarizing plate, this is caused by the shift. The image quality may be degraded.

  Then, an object of this invention is to provide the manufacturing method of the polarizing plate which can manufacture the polarizing plate in which the direction of an absorption axis has faced the design direction more correctly, and the manufacturing method of a liquid crystal panel.

  The method for producing a polarizing plate according to one aspect of the present invention is a method for producing a polarizing plate having an absorption axis, wherein the first strip-shaped polarizing plate is cut at a plurality of locations in the width direction, and the width of the first strip-shaped polarizing plate is obtained. Cutting step to obtain a plurality of second strip polarizing plates having a narrower width, and a polarizing plate region in the second strip polarizing plate corresponding to the polarizing plate to be manufactured, the direction of the absorption axis in the second strip polarizing plate Based on the above, a polarizing plate region in which the direction of the absorption axis in the polarizing plate region faces the design direction of the absorption axis in the polarizing plate to be manufactured is obtained by processing each second band-shaped polarizing plate and taking out the polarized light. And a processing step for obtaining a plate.

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

  Since the width of each second band-shaped polarizing plate is narrower than the width of the first band-shaped polarizing plate, the fluctuation width in the absorption axis direction in the width direction of each second band-shaped polarizing plate is the absorption axis direction in the width direction of the first band-shaped polarizing plate. Is less than the fluctuation range. And since the polarizing plate is manufactured by processing each 2nd strip | belt-shaped polarizing plate and taking out the said polarizing plate area | region in each 2nd strip | belt-shaped polarizing plate, it is in the design direction requested | required with the polarizing plate as a product. A polarizing plate having an absorption axis more accurately oriented can be produced.

  In one embodiment, in the cutting step, the first web roll in which the first strip 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 polarizing plates are respectively rolled. You may obtain a some 2nd strip | belt-shaped polarizing plate as the rolled 2nd original fabric roll.

  In this case, the 1st original fabric roll is cut in a plurality of places in the width direction, and the 2nd original fabric roll is obtained. Therefore, for example, the step of winding a plurality of second strip-shaped polarizing plates obtained from the first strip-shaped polarizing plate into a roll can be omitted, and while feeding the second strip-shaped polarizing plate from each obtained second original fabric roll, A polarizing plate can be manufactured. Therefore, a polarizing plate can be manufactured efficiently.

  In one embodiment, in the processing step, at least one second band-shaped polarizing plate may be cut out of the plurality of second band-shaped polarizing plates, and a polarizing plate region may be cut out from at least one second band-shaped polarizing plate. .

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

  In one embodiment, the processing step includes an intermediate cutting step of cutting out a polarizing plate intermediate including a polarizing plate region from at least one second striped polarizing plate among a plurality of second striped polarizing plates, and intermediate cutting out An intermediate body processing step of extracting a polarizing plate region from the polarizing plate intermediate body by processing the polarizing plate intermediate body cut out in the step.

  In this embodiment, a polarizing plate intermediate is cut out from at least one second band-shaped polarizing plate, and a polarizing plate is produced from the polarizing plate intermediate.

  In the intermediate processing step, the polarizing plate region may be cut out from the polarizing plate intermediate by processing the end face of the polarizing plate intermediate.

  Since the polarizing plate region is cut out from the polarizing plate intermediate, it is easy to correct the deviation of the absorption axis direction with respect to the longitudinal direction of the first strip polarizing plate due to the influence of bowing or the like when processing the end face of the polarizing plate intermediate .

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

  If at least three second strip polarizing plates are obtained from the first strip polarizing plate, the variation in the absorption axis direction in the width direction can be further reduced in each second strip polarizing plate. 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 step, the second axis-shaped polarizing plate to be obtained has an absorption axis direction within an allowable range with respect to the direction of the reference absorption axis in each second band-shaped polarizing plate. Based on the axial angle data indicating the distribution of the absorption axis direction in the width direction of the one-band polarizing plate, the first band-shaped polarizing plate may be cut at a plurality of locations in the width direction.

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

  In one embodiment, the width of the first strip polarizing plate may be 1000 mm or more.

  If the width of the first strip-shaped polarizing plate is 1000 mm or more, the influence of bowing tends to increase. Therefore, the above-described production method capable of producing a polarizing plate whose absorption axis direction is more accurately oriented in the design direction is effective.

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

  Such polarizing plates tend to be used for small and medium-sized displays for which high contrast has been required. Therefore, the above-described production method capable of producing a polarizing plate whose absorption axis direction is more accurately oriented in the design direction is effective.

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

  The VA type or IPS type liquid crystal display device can display an image with high contrast. For this reason, there is a tendency that image display with higher contrast is required. Therefore, the manufacturing method described above that can obtain a polarizing plate in which the direction of the absorption axis is accurately oriented in the design direction is effective.

  The manufacturing method of the liquid crystal panel which concerns on the other side surface of this invention manufactures a polarizing plate with the manufacturing method of the polarizing plate which concerns on one side surface of this invention, and pastes the obtained polarizing plate to a liquid crystal cell, and is liquid crystal Manufacture panels.

  The polarizing plate bonded to the liquid crystal cell by the method for producing a liquid crystal panel is produced by the method for producing a polarizing plate according to one aspect of the present invention. Therefore, in the manufactured polarizing plate, the absorption axis direction is more accurately in the design direction. Therefore, when an image is displayed on the liquid crystal panel, the image quality can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the polarizing plate which can manufacture the polarizing plate which the direction of an absorption axis has faced the design direction, and the manufacturing method of a liquid crystal panel can be provided.

FIG. 1 is a perspective view of a polarizing plate schematically showing the configuration of a polarizing plate produced by the method for producing a polarizing plate according to one embodiment. FIG. 2 is a schematic diagram of a first strip-shaped polarizing plate for producing the polarizing plate shown in FIG. FIG. 3A is a diagram illustrating a method for manufacturing a polarizing plate, in which a first raw roll on which the first strip-shaped polarizing plate shown in FIG. FIG. 3B is a view showing a state in which the first original roll is divided into a plurality of second original rolls by the process shown in FIG. 3A. Fig.4 (a) is a schematic diagram which shows the intermediate body cutting process which cuts out a polarizing plate intermediate body from the roll by which the 2nd strip | belt-shaped polarizing plate shown in FIG.3 (b) was wound, FIG.4 (b) is FIG. 5 is a drawing schematically showing a polarizing plate intermediate cut out in the intermediate cutting step shown in FIG. 4A and a polarizing plate region in the polarizing plate intermediate. FIG. 5 is a drawing schematically showing a configuration of a liquid crystal panel manufactured by a method for manufacturing a liquid crystal panel according to an embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same symbols are assigned to the same elements. A duplicate description is omitted. The dimensional ratios in the drawings do not necessarily match those described. In the description, words indicating directions such as “up” and “down” are convenient words based on the state shown in the drawings.

(First embodiment)
Polarizing plate 1 according to the schematically the embodiment shown in FIG. 1 has the absorption axis S _A, and a transmission shaft S _T perpendicular to the absorption axis S _A. The polarizing plate 1 is an optical element having linear polarization characteristics that absorbs light oscillating in the absorption axis S _A direction and selectively transmits light oscillating in the transmission axis S _T direction.

The polarizing plate 1 is applied to a liquid crystal display device, for example. For example, the polarizing plate 1 can be bonded to both surfaces of the liquid crystal cell in a crossed nicols state to constitute a part of the liquid crystal panel. The example of the planar view shape (shape seen from the thickness direction) of the polarizing plate 1 is a rectangle such as a rectangle or a square as shown in FIG. Absorption axis S _A direction of the polarizing plate 1 is oriented in a predetermined direction in the polarizer 1.

Predetermined direction absorption axis S _A in the polarizing plate 1, device polarizing plate 1 is applied (for example, a liquid crystal display device) is the direction of the absorption axis S _A required in such advance at the design stage of the polarizer 1 the design direction of the absorption axis S _a to be designed.

  The predetermined direction is a direction of a predetermined angle θ from the reference side with one side of the polarizing plate 1 as a reference side. For example, when the planar view shape of the polarizing plate 1 is a rectangle, the predetermined direction is a direction with a predetermined angle θ = 0 (that is, a direction parallel to the long side) and a predetermined angle θ = 45 ° with respect to the long side. And the diagonal direction can be exemplified. For simplification of description, unless otherwise specified, a configuration of the polarizing plate 1 in which the shape in plan view is a rectangle and the predetermined direction is the long side direction will be described below.

  In FIG. 1, the thickness of the polarizing plate 1 is shown to be relatively thick due to the illustrated relationship. However, the thickness of the polarizing plate 1 is usually sufficiently smaller than the lengths of the long side and the short side in the planar view shape of the polarizing plate 1, and the polarizing plate 1 has a film shape.

  The magnitude | size of the polarizing plate 1 should just be set according to the device in which the polarizing plate 1 is used. An example of the size of the polarizing plate 1 is a polarizing plate having a diagonal length of 12.5 mm to 350 mm, that is, a length corresponding to a so-called 0.5 type to 12 type. When the polarizing plate 1 is applied to a liquid crystal display device, the liquid crystal panel to which the polarizing plate 1 is bonded is not particularly limited. For example, a VA (Vertical Alignment) type capable of displaying an image with high contrast, and IPS ( In-Place-Switching) type liquid crystal panels and high-definition liquid crystal panels are exemplified. The high-definition liquid crystal panel is, for example, a liquid crystal panel having a pixel number of 200 ppi (pixel per inch) or more.

  The polarizing plate 12 is a laminate having a polarizer film 2a as a polarizing layer that selectively transmits light that vibrates 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 may be any film used for a known linear polarizing plate.

  Examples of the resin film that the polarizer film 2a has are polyvinyl alcohol (hereinafter also referred to as “PVA”) resin film, polyvinyl acetate resin film, and ethylene / vinyl acetate (hereinafter sometimes referred to as “EVA”). Including resin film, polyamide resin film and polyester resin film. Usually, a PVA-type resin film, especially a PVA film is used from a viewpoint of the adsorptivity and orientation of a dichroic dye. Hereinafter, unless otherwise specified, the resin film included in the polarizer film 2a will be described as a PVA film.

  The dichroic dye is oriented and adsorbed on the uniaxially stretched resin film in the stretching direction. Thereby, the polarizer film 2a absorbs light in the orientation direction (that is, the molecular long axis direction) of the dichroic dye and transmits light in the direction orthogonal to the orientation direction, that is, polarization characteristics. Have Examples of dichroic dyes are iodine and dichroic organic dyes. The example of the thickness of the polarizer film 2a is 1 micrometer-30 micrometers.

  Protective films 2b and 2c as protective layers for protecting the polarizer film 2a are bonded to both surfaces of the polarizer film 2a. Examples of the protective films 2b and 2c include a triacetyl cellulose (hereinafter also referred to as “TAC”) film, a polyethylene terephthalate film, a nylon film, a polycarbonate film, a polyethylene film, and the like. Usually, a TAC film having a small optical anisotropy, particularly a TAC film is used. The example of the thickness of the protective films 2b and 2c is 10 micrometers-200 micrometers. The protective films 2b and 2c are usually laminated on the polarizer film 2a via an adhesive layer.

  The polarizing plate 1 is not limited to the form in which the protective films 2b and 2c are laminated on the polarizer film 2a, and the protective film (for example, the protective film 2b) is laminated on one of both surfaces of the polarizer film 2a. Just do it.

  A surface protective film (or a protective film) 2d for protecting the protective film 12b may be bonded to the protective film 2b. An example of the thickness of the surface protective film 2d is 30 μm to 100 μm. Examples of the material of the surface protective film 2d are polyethylene, polypropylene, and polyester.

  Furthermore, 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. The example of the thickness of the adhesive layer 2e is 3 micrometers-30 micrometers. The example of the adhesive which comprises the adhesive layer 2e contains an acrylic adhesive, a urethane adhesive, and a silicone adhesive.

  In the form in which the pressure-sensitive adhesive layer 2e is bonded, the separate film 2f may be bonded to the pressure-sensitive adhesive layer 2e in a peelable manner. The separate film 2f is a film for preventing other regions of the first strip-shaped polarizing plate 10 and dust from adhering to the pressure-sensitive adhesive layer 2e until the polarizing plate 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 by, for example, bonding the separate film 2f having the adhesive layer 2e formed on the surface thereof to the protective film 2c.

  The polarizing plate 1 is manufactured from the 1st strip | belt-shaped polarizing plate 10 shown in FIG. FIG. 2 is a schematic diagram of a first strip-shaped polarizing plate for producing the polarizing plate shown in FIG.

  The example of the length of the longitudinal direction of the 1st strip | belt-shaped polarizing plate 10 is 100m-3000m, and the 1st strip | belt-shaped polarizing plate 10 is wound by roll shape. A first strip-shaped polarizing plate roll in which the first strip-shaped polarizing plate 10 is wound around a core C that is a winding axis is referred to as a first raw roll 11. The example of the width | variety of the 1st strip | belt-shaped polarizing plate 10 is 1000 mm or more. Usually, the width | variety of the 1st strip | belt-shaped polarizing plate 10 is 3000 mm or less.

  The 1st strip | belt-shaped polarizing plate 10 has the same layer structure as the polarizing plate 1 shown in FIG. That is, the 1st strip | belt-shaped polarizing plate 10 has the polarizer film 2a, and the protective films 2b and 2c as a protective layer for protecting the polarizer film 2a are bonded together on both surfaces of the polarizer film 2a. . A surface protective film 2d may be bonded to the protective film 2b. Moreover, the adhesive layer 2e is formed in the protective film 2c, and the separate film 2f may be peelably bonded on the adhesive layer 2e.

  The 1st strip | belt-shaped polarizing plate 10 is manufactured as follows, for example. A strip-shaped raw material resin film is uniaxially stretched in the longitudinal direction (stretching step). An example of the raw material resin film is a non-stretched PVA film having no orientation. The example of a draw ratio is 4 times-5 times. The uniaxial stretching method 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 resin film by applying tension in the longitudinal direction while bringing the raw resin film into contact with a hot roll.

  After uniaxially stretching the raw resin film, a PVA film that is the raw resin film after uniaxial stretching is immersed in an aqueous solution containing a dichroic dye (dyeing step). Thereby, the dichroic dye is adsorbed and oriented on the PVA film to dye the PVA film. Thus, the polarizer film 2a is obtained through the stretching process and the dyeing process. Therefore, the said extending process and dyeing | staining process comprise a polarizer film manufacturing process.

  Next, the protective films 2b and 2c are bonded to both surfaces of the polarizer film 2a (protective film laminating step). Then, according to the laminated constitution of the polarizing plate 1 to manufacture, the 1st strip | belt-shaped polarizing plate 10 is obtained by laminating | stacking the surface protective film 2d, the adhesive layer 2e, and the separate film 2f.

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

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

However, when uniaxially stretched, bowing may occur in which the edge in the width direction is slightly curved inward. Therefore, as illustrated in FIG. 2, in the width direction of the first belt-shaped polarizing plate 10, there may be cases where the absorption axis S _A direction is shifted from the longitudinal direction. The size of the offset angle from the longitudinal direction of the absorption axis _{S A} direction is, for example, approximately 0.2 ° to 0.3 °. In FIG. 2, this misalignment angle is exaggerated. Offset angle with respect to the longitudinal direction of the absorption axis S _A direction due to the bowing, in the width direction of the first belt-shaped polarizing plate 10, there is a tendency that a continuous change.

Usually, in the manufacturing process of the first band-shaped polarizing plate 10, the deviation angle from the longitudinal detected in the widthwise direction of the absorption axis S _A direction as described above, is obtained as the axis angle data of the absorption axis S _A in the width direction ing. Axial angle data is information in the first strip-shaped polarizing plate 10 with respect to the width direction distribution of the first belt-shaped polarizing plate 10 of the tilt angle of the absorption axis S _A direction with respect to the reference direction such longitudinal direction.

When acquiring the axis angle data of the thus absorption axis S _A, with the production of the first strip polarizer 10, the absorption axis direction of the detection process for obtaining axial angle data of the absorption axis S _A. This detection process may be performed, for example, after preparing the polarizer film 2a and before the process of bonding the protective films 2b and 2c to the polarizer film 2a, or the protective films 2b and 2c are bonded to the polarizer film 2a. You may perform after the process of bonding to.

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

When manufacturing the polarizing plate 1, as shown to Fig.3 (a), the 1st original fabric roll 11 was cut | disconnected in the multiple places in the width direction of the 1st original fabric roll 11, and it showed to FIG.3 (b) In this way, a plurality of second raw fabric rolls 13 ₁ , 13 ₂ ,..., 13 _N (N is an integer of 2 or more) is obtained (cutting step). In Fig.3 (a), the cutting position of the 1st original fabric roll 11 is typically shown with the dashed-two dotted line. In FIGS. 3 (a) and 3 (b), the first original fabric roll 11 is cut at four points, 1 five second original fabric roll _13, 13 _2, 13 _3, 13 4, 13 ₅ to obtain the form Is illustrated.

  What is necessary is just to cut | disconnect the 1st original fabric roll 11, for example, moving the cutting blade 20 (refer Fig.3 (a)) sequentially to a cutting position. Or you may cut | disconnect the 1st original fabric roll 11 at once with the some cutting blade 20 arrange | positioned according to a cutting position. The cutting blade 20 in FIG. 3A is schematically shown, and an example of the cutting blade 20 is a tip saw.

The second original fabric rolls 13 ₁ , 13 ₂ ,..., 13 _N obtained in the cutting step of cutting the first original fabric roll 11 in the width direction are narrower than the width of the first strip polarizing plate 10. 2 band polarizer _{12 1,} 12 2, ..., a second strip-shaped polarizer roll set around 12 _N. When the first raw roll 11 is cut, the core C, which is an axis for winding the first strip-shaped polarizing plate 10, may be cut together, or the core C is not cut and the first strip-shaped polarizing plate is cut. Only 10 may be cut. In FIG. 3B, illustration of the core C is omitted.

The cutting width when cutting the first original fabric roll 11 is such that the widths of the second strip polarizing plates 12 _{1 to} 12 _N to be divided from the first original fabric roll 11 are narrower than the width of the first strip polarizing plate 10. and a second strip-shaped polarizer 12 ₁ width, which may include a region that becomes the polarizer 1 as from to 12 _N that can produce a polarizing plate 1. The region to be the polarizing plate 1 may be a polarizing plate region 31 described later. The cutting width, that is, the widths of the second original fabric rolls 13 _{1 to} 13 _N may be different from each other.

Cutting width at the time of cutting the first original fabric roll 11 is based on the axial angle data is data of the angular distribution of the absorption axis S _A direction in the width direction of the first belt-shaped polarizing plate 10, the second strip-shaped polarizer direction of absorption axis _{S a} is set so as to substantially align in 12 ₁ to 12 _N.

For example, as shown in FIG. 3B, the direction of the absorption axis S _A is substantially aligned. For example, as shown in FIG. 3B, in each of the second strip-shaped polarizing plates 12 _{1 to} 12 _N , the absorption axis S _A ( Hereinafter, it means that the angular distribution in the direction of the absorption axis S _A with respect to the direction of the reference absorption axis S _{A — B} is within an allowable range. The allowable range may be determined depending on the polarizing plate 1 to be manufactured, and is, for example, about ± 0.1 ° with respect to the reference absorption axis S _{A — B.}

For example, when the first raw fabric roll 11 is cut, the direction of the absorption axis S _A at a plurality of predetermined positions in the width direction of the first strip-shaped polarizing plate 10 is set as the reference absorption axis S _{A — B} direction. fluctuation angular width of the absorption axis S _a direction relative to the absorption axis S _a _ _B direction may be the width of the region is within the allowable range as a cutting width.

Since the cutting width of the first raw fabric roll 11 is a width including the region to be the polarizing plate 1 so that the polarizing plate 1 can be manufactured from the second strip-shaped polarizing plates 12 _{1 to} 12 _N , as described above, The distance between the predetermined positions adjacent to each other 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 of the polarizing plate region 31 described later (the polarizing plate region 31). Is the length projected in the width direction) or more.

After obtaining a plurality of second original fabric roll ₁₃ 1 to 13 _N, processing the second band-shaped polarizing plate ₁₂ 1 to 12 _N constituting the second original fabric roll ₁₃ 1 to 13 _N, polarized as a product light plate 1 The manufacturing process to manufacture is performed. This processing step is described with the second original fabric roll 13 ₁ exemplifying the case of manufacturing the polarizing plate 1.

As shown in FIG. 4 (a), from the second original fabric roll 13 ₁ feeding a second strip-shaped polarizer 12 _1, it cuts out polarizing plate Intermediate 30 (Intermediate cutting step). Polarizer Intermediate 30, while conveying the second strip-shaped polarizer 12 ₁ the feeding direction (longitudinal direction), depending on the size of the polarizing plate 1 to produce from the second band-shaped polarizing plate 12 _1, a second band-shaped polarizing cut out by cutting the longitudinal position of the plate 12 ₁ in the cutting blade 21.

  The polarizing plate intermediate 30 only needs to have a size including a polarizing plate region 31 corresponding to the product size of the polarizing plate 1 as schematically shown by a broken line in FIG. It may be a size including a cutting surface due to processing.

  Thereafter, the intermediate body processing step of processing the polarizing plate intermediate 30 and taking out the polarizing plate region 31 to obtain the polarizing plate 1 is performed. Taking out the polarizing plate region 31 from the polarizing plate intermediate 30 means separating or deleting a region other than the polarizing plate region 31 in the polarizing plate intermediate 30 from the polarizing plate region 31.

  Hereinafter, an end face processing step as an example of the intermediate processing step will be described. In the end face processing step, the end faces 30 a, 30 b, 30 c, 30 d of the polarizing plate intermediate 30 are processed (end face processing), and the polarizing plate region 31 is cut out from the polarizing plate intermediate 30. obtain. An example of the end face processing is a cutting process for cutting the end faces 30a to 30d, and the cutting process includes a polishing process for polishing the end faces 30a to 30d.

The polarizing plate region 31 is set so that the absorption axis S _A direction of the polarizing plate region 31 is the design direction (predetermined direction) of the absorption axis S _A in the polarizing plate 1. Therefore, for example, as the second band-shaped polarizing plate 12 _1, at an angle with respect to the absorption axis S _A direction second strip-shaped polarizer 12 ₁ in the longitudinal direction (the direction indicated by the dashed line in FIG. 4 (b)) In the case of tilting, the polarizing plate region 31 is also tilted with respect to the longitudinal direction of the polarizing plate intermediate 30 as shown in FIG. Therefore, the second strip-shaped polarizer 12 _first width, from the width of the polarizing plate region 31 (the short side direction in FIG. 4 (a)), at least long.

Direction of absorption axis S _A used for the setting of the polarizing plate region 31 is the direction of the second band-shaped polarizing plate 12 ₁ of the absorption axis S _A, for example, the reference absorption axis of the second band-shaped polarizing plate 12 ₁ It can be in the direction of S _{A — B.} As described above, second original fabric roll 13 _1, the first original fabric roll 11 based on the axis angle data of the absorption axis S _A in the width direction of the first belt-shaped polarizing plate 10, the absorption axis S _A direction substantially It is cut and made so as to be aligned. Therefore, the direction of the absorption axis S _A to be used for setting the polarizing plate region 31 are known.

  In the end face processing step of processing the end faces 30 a to 30 d of the polarizing plate intermediate 30, the end faces 30 a to 30 d of the polarizing plate intermediate 30 are cut or polished with a cutting blade, and the polarizing plate region 31 is shaved from the polarizing plate intermediate 30. By taking out, the polarizing plate 1 as a product is obtained. In the end face processing step, for example, end face processing of the plurality of polarizing plate intermediate bodies 30 may be performed collectively using a laminated body in which a plurality of polarizing plate intermediate bodies 30 are stacked.

It has been described a method for producing the polarizing plate 1 from the second original fabric roll 13 _1, the other second original fabric roll _{13 2,} 13 3, ..., the same when manufacturing a polarizing plate 1 from 13 _N is there. The size and shape of the polarizer 1 for producing from each of the second original fabric roll 13 ₁ to 13 _N may be different. Therefore, the cutting width when the first original fabric roll 11 to divide the second original fabric roll ₁₃ 1 to 13 _N is the size and shape of the polarizer 1 for producing from the second original fabric roll ₁₃ 1 to 13 _N It will be set based on the axial angle data of the absorption axis S _a of the first belt-shaped polarizing plate 10.

The first band-shaped polarizing plate 10 constituting the first original fabric roll 11, by the effect of bowing as illustrated in FIG. 2, in the width direction, the distribution of the absorption axis S _A direction is generated. For example, in the central portion in the width direction of the first belt-shaped polarizing plate 10, while the absorption axis S _A direction is substantially parallel to the longitudinal direction of the first belt-shaped polarizing plate 10, the edge vicinity, of the first band-shaped polarizing plate 10 A slight deviation (for example, 0.2 ° to 0.3 °) occurs with respect to the longitudinal direction.

In the above manufacturing method, the first original fabric roll 11 is cut at a plurality of locations in the width direction, and to produce a second band-shaped polarizing plate 12 ₁ to 12 _N have a width less than the width of the first band-shaped polarizing plate 10. Then, based on the absorption axis S _A direction in each second strip-shaped polarizer 12 ₁ to 12 _N, the absorption axis S _A direction, to face the predetermined is required in the polarizing plate 1 as a product direction (design direction) The polarizing plate 1 is manufactured.

Width of the second band-shaped polarizing plate ₁₂ 1 to 12 _N, since the narrower than the width of the first strip-shaped polarizing plate 10, the variation of the absorption axis _{S A} direction in each second strip-shaped polarizer ₁₂ 1 to 12 _N is small. Then, based on the respective absorption axes S _A direction from the second band-shaped polarizing plate 12 ₁ to 12 _N, since it is manufactured polarizing plate 1, the absorption axis are required in the polarizing plate 1 as a product S it is possible to produce a polarizing plate 1 absorption axis S _a for a given direction of _a are more accurately directed.

In the illustrated manufacturing method, the cutting width at the time of the first original fabric roll 11 into round slices are set on the basis of the axis angle data of the absorption axis S _A in the width direction of the first belt-shaped polarizing plate 10. Specifically, the cutting width is set so that the fluctuation width in the absorption axis S _A direction is within the allowable range with respect to the plurality of reference absorption axes S _{A — B} using the shaft angle data. . Therefore, the absorption axis _{S A} direction in each second strip-shaped polarizer ₁₂ 1 to 12 _N is substantially aligned easily. Therefore, the absorption axis S _A is, to produce a polarizing plate 1 facing the predetermined direction with high accuracy easily.

Second strip-shaped polarizer ₁₂ 1 to 12 _N is by slicing the first original fabric roll 11, the second original fabric roll ₁₃ 1 to the second band-shaped polarizing plate ₁₂ 1 to 12 _N are already wound state _Produced as 13N. Therefore, the polarizing plate 1 can be manufactured using the 2nd original fabric rolls 13 _{1 to} 13 _N without passing through the process of rewinding the second strip-shaped polarizing plates 12 _{1 to} 12 _N into a roll shape again. Therefore, the polarizing plate 1 can be manufactured more efficiently. Further, since the second strip-shaped polarizer 12 ₁ to 12 _N are also unnecessary, such as re-wound back device into a roll, it is also possible to reduce the production cost of the polarizing plate 1.

In the above manufacturing method, when the polarizing plate Intermediate 30 cut out of the polarizing plate 1, so that the absorption axis S _A in the polarizer region 31 faces the design direction of the absorption axis S _A in the polarizing plate 1, a polarizing plate region 31 Is set. This may be more reliably correct the deviation from the longitudinal direction of the first belt-shaped polarizing plate 10 of the absorption axis S _A direction by Boeing. As a result, it is possible to the direction of the absorption axis S _A, displacement of the predetermined direction of the absorption axis S _A required in the polarizing plate 1 as a product to produce a smaller polarizing plate 1.

Image display capable VA type with high contrast, and the polarizing plate 1 is applied to a liquid crystal panel of the IPS type, for image display with high contrast, the absorption axis S _A direction, the design of the polarizer 1 The direction (predetermined direction) has been required to coincide with high accuracy. Therefore, the absorption axis S _A direction, more precisely can be manufactured a polarization plate 1, which may coincide with the designed direction the manufacturing method described above, VA type, and is effective to produce a polarizing plate for a liquid crystal panel of an IPS type is there. When the liquid crystal panel is a VA type, it may be an ASV (Advanced Super View) type.

Similarly, the polarizing plates high-definition image display is applied to a liquid crystal panel capable, that the absorption axis S _A direction is coincident with a predetermined direction with high accuracy required in the polarizing plate 1 as a product Is required. Therefore, the absorption axis S _A direction, more precisely designed direction with the production method can be produced a polarizing plate 1, which may coincide, for producing a polarizing plate high-definition image display is used in a liquid crystal panel capable It is effective for.

Unlike a large TV with a large screen size, a display for a small to medium size portable device of 12 type (diagonal length is 350 mm) or less is required to have high contrast because the user tends to view the screen from a short distance. Therefore, the absorption axis S _A direction, more precisely can be manufactured a polarization plate 1, which may coincide with the designed direction above manufacturing method is effective to produce a polarizing plate for use in small and medium-sized portable equipment for display.

The planar view shape of the polarizing plate 1 is a rectangle or a square, and the length of a diagonal line is 12.5 mm to 350 mm, which corresponds to a size of about 0.5 type to 12 type, and more than 2 type (diagonal length 50 mm). In the form which is length, the polarizing plate 1 is easy to be used for a display for small and medium-sized portable devices. Therefore, the absorption axis S _A direction, more precisely can be manufactured a polarization plate 1, which may coincide with the designed direction the manufacturing method described above, the length of the diagonal is the plan view shape rectangular or square in 12.5mm~350mm This is effective for a certain polarizing plate.

In the form in which the width of the first strip-shaped polarizing plate 10 is 1000 mm or more, the above-described bowing effect tends to increase. Therefore, more than 1000mm length in the width, usually making the polarizing plate from the first band-shaped polarizing plate 10, below 3000 mm, the absorption axis S _A of the polarizing plate 1 whose direction may coincide with more accurate design direction The manufacturing method 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 configuration shown in FIG. 1, the polarizing plate 1 from which the separate film 2f is peeled is also referred to as a polarizing plate 1A.

  As schematically shown in FIG. 5, the liquid crystal panel 3 is configured by laminating a polarizing plate 1 </ b> A obtained by peeling the separate film 2 f from the polarizing plate 1 on both surfaces of the liquid crystal cell 4. As the liquid crystal cell 4, any liquid crystal cell may be used as long as it is used for a known liquid crystal panel. For example, the liquid crystal cell 4 may be a glass substrate 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 sequentially provided. Examples of the driving method of the liquid crystal cell 4 are a VA type and an 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 by the polarizing plate manufacturing method described in the first embodiment (polarizing plate manufacturing step). Next, the polarizing plate 1 is bonded to both surfaces of the liquid crystal cell 4 to obtain the liquid crystal panel 3 (polarizing plate bonding step).

  In the polarizing plate bonding step, 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 via the adhesive layer 2e. When the polarizing plate 1 is bonded to both surfaces of the liquid crystal cell 4, the two polarizing plates 1 </ b> A are bonded to the liquid crystal cell 4 so that the two polarizing plates 1 are in a crossed Nicol state.

In the manufacturing method of the liquid crystal panel 3, the polarizing plate 1 to be the polarizing plate 1A included in the liquid crystal panel 3 is manufactured by the manufacturing method exemplified in the first embodiment. Therefore, in the polarizing plate 1, the absorption axis S _A is more accurately oriented in a predetermined direction of the absorption axis S _A required for the liquid crystal panel 3. Therefore, in the manufactured liquid crystal panel 3, when displaying an image, an image quality can be improved.

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

  The polarizing plate 1 manufactured by the manufacturing method of the polarizing plate demonstrated by 1st Embodiment should just 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 2 e for bonding to the liquid crystal cell 4. When the polarizing plate 1 manufactured by the manufacturing method of the polarizing plate described in the first embodiment does not have the pressure-sensitive adhesive layer 2e, the polarizing plate 1 and the liquid crystal cell 4 may be bonded together with an adhesive, for example. The pressure-sensitive adhesive layer may be provided on the liquid crystal cell 4 side.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the illustrated various embodiments, but is shown by the scope of the claims and all within the scope and meaning equivalent to the scope of the claims. Is intended to be included.

For example, in the manufacturing method of the polarizing plate 1 exemplified in the first embodiment, the polarizing plate intermediate 30 is subjected to end face processing to manufacture the polarizing plate 1 as a product. However, a region other than the polarizing plate region 31 may be separated from the polarizing plate region 31 or directly taken out from the second belt-shaped polarizing plates 12 _{1 to} 12 _N. For example the cutting for cutting the second strip-shaped polarizer ₁₂ 1 to 12 _N of the polarizing plate region 31 directly from, or may be performed on the second strip-shaped polarizer ₁₂ 1 to 12 _N. Examples of the cutting method in the case of performing such cutting processing include punching with a blade shape and laser cutting using a laser beam.

Also in the intermediate cutting process, which is a process for taking out the polarizing plate 1 from the polarizing plate intermediate 30, it is not limited to end face processing using cutting (including polishing), but punching with a blade shape and laser beam Laser cut by may be used. Also in step in the second band-shaped polarizing plate 13 ₁ to 13 _N cutting out the polarizing plates Intermediate 30, for example, may be used a laser cut.

Method for producing the polarizing plate 1 from the second band-shaped polarizing plate ₁₂ 1 to 12 _N may not be the same for all of the second band-shaped polarizing plate ₁₂ 1 to 12 _N. For example, while preparing the polarizing plate 1 is cut out polarizing plate region 31 directly from the at least one second strip-shaped polarizing plate of the second band-shaped polarizing plate ₁₂ 1 to 12 _N, the second strip-shaped polarizer ₁₂ 1 to 12 _N After preparing the polarizing plate intermediate body 30 from the remaining second strip-shaped polarizing plate, the polarizing plate 1 may be taken out from the polarizing plate intermediate body 30.

For example, in the central portion in the width direction of the first belt-shaped polarizing plate 10, the absorption axis S _A direction is substantially longitudinal. Therefore, the width of the second strip-shaped polarizing plate cut out from the center portion in the width direction of the first strip-shaped polarizing plate 10 may be the same as the width of the polarizing plate region 31.

In this case, the processing step of processing the plurality of second band-shaped polarizing plate ₁₂ 1 to 12 _N to obtain a polarizing plate 1, of the plurality of second band-shaped polarizing plate ₁₂ 1 to 12 _N, the width of at least the polarizing plate regions 31 For the second band-shaped polarizing plate having the same width as the first band-shaped polarizing plate, the second band-shaped polarizing plate is cut by the length of the polarizing plate region 31 in the longitudinal direction of the second band-shaped polarizing plate, and the polarizing plate 1 is manufactured. Among the plurality of second band-shaped polarizing plates 12 _{1 to} 12 _N , for the second band-shaped polarizing plate having a width longer than the width of the polarizing plate region 31, the second band-shaped polarized light is obtained by the method exemplified above. What is necessary is just to manufacture the polarizing plate 1 from a board.

The number of polarizing plate regions 31 set in the width direction of the second strip-shaped polarizing plates 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) exemplify the form in which the first original roll 11 is divided into _five second original rolls 13 _{1 to} 13 ₅ , the number of second original rolls Is not limited to five (ie, N = 5). A plurality of second original fabric rolls that are narrower than the first original fabric roll 11 may be produced from the first original fabric roll 11. For example, by cutting the first original fabric roll 11 with a constant cutting width from each of both edges in the width direction of the first original fabric roll 11, in the width direction of the first original fabric roll 11, You may produce two 2nd original fabric rolls and one 2nd original fabric roll between them. In this case, three second original fabric rolls are produced from one first original fabric roll 11.

As schematically shown in FIG. 2, in the width direction of the first strip-shaped polarizing plate 10, the influence of bowing is greater in the vicinity of both edges than in the vicinity of the center. Therefore, the direction of the absorption axis S _A of the central portion near at the width direction of the first belt-shaped polarizing plate 10, deviation between the direction of the absorption axis S _A near opposite edges increases.

However, the direction of the fluctuation width of the absorption axis S _A in the region of the fluctuation range and the both edges near the direction of the absorption axis S _A in the region of the central portion near the smaller, respectively. Therefore, if the first strip-shaped polarizing plate 10 is divided into three second strip-shaped polarizing plates near both edges in the width direction and near the center, the three variations in the direction of the absorption axis in the width direction are small. A two-band polarizing plate can be obtained.

  As the number of second band-shaped polarizing plates divided from the first band-shaped polarizing plate 10 increases, that is, the more the number of cut portions in the width direction of the first band-shaped polarizing plate 10 is, the second band-shaped polarized light whose absorption axis direction is aligned. A board can be obtained. From this viewpoint, the number of the second band-shaped polarizing plate is preferably five or more.

If the first strip-shaped polarizer 10 to obtain a plurality of second strip-shaped polarizer ₁₂ 1 to 12 _N, the first original fabric roll 11 is cut into round slices, it was to obtain a second original fabric roll ₁₃ 1 to 13 _N. However, the first strip-shaped polarizing plate 10 is fed out from the first raw fabric roll 11, and the first strip-shaped polarizing plate 10 is cut into slits at a plurality of locations in the width direction of the first strip-shaped polarizing plate 10, and a plurality of second strip-shaped polarizing plates are obtained. The plates 12 _{1 to} 12 _N may be obtained.

In this case, usually, the second band-shaped polarizing plate ₁₂ 1 to 12 _N obtained, again, to produce a second original fabric roll ₁₃ 1 to 13 _N that was wound into a roll. As described above, when the second original fabric rolls 13 _{1 to} 13 _N are produced, the steps after the production of the second original fabric rolls 13 _{1 to} 13 _N are the steps after the description with reference to FIG. It is the same.

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

When producing the polarizing plate 1 by processing the respective second strip-shaped polarizer ₁₂ 1 to 12 _N, for example, cutting out the polarizing plate Intermediate 30 from the second band-shaped polarizing plate ₁₂ 1 to 12 _N, the polarizing plate Intermediate 30 The polarizing plate 1 may be manufactured by processing.

Cutting width in the case of dividing the first strip polarizer 10 into a plurality of second strip-shaped polarizer 12 ₁ to 12 _N may not be based on the absorption axis S _A axis angle data in the first band-shaped polarizing plate 10 . A first band-shaped polarizing plate 10, by dividing into a plurality of second strip-shaped polarizer ₁₂ 1 to 12 _N, the variation width of the absorption axis _{S A} direction in the width direction of the second band-shaped polarizing plate ₁₂ 1 to 12 _N is smaller than the variation width of the absorption axis S _a direction in the first band-shaped polarizing plate 10, it is possible to produce a polarizing plate 1 absorption axis S _a is oriented in the desired direction with higher accuracy.

In this case, when manufacturing the first strip polarizer 10 may not detect the axial angle data of the absorption axis S _A. In the production of the polarizing plate 1 from the second band-shaped polarizing plate ₁₂ 1 to 12 _N, and detects the direction of the absorption axis _{S A} of the second band-shaped polarizing plate ₁₂ 1 to 12 _N, the polarizer area of the detection result 31 of it may be used as the direction of absorption axis S _a.

  The planar view shape of the polarizing plate 1 is illustrated as a rectangle such as a rectangle or a square, but is not limited to a rectangle and may be a circle.

  Examples of the driving method of the liquid crystal panel to which the polarizing plate 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 polarizing plate 1 is applied may be a TN (Twisted Nematic) method.

1 ... polarizing plate, 10 ... first band polarizer, 11 ... first original fabric roll, ₁₂ 1 to 12 N _... second band polarizer, ₁₃ 1 to 13 N _... second original fabric roll, 30 ... polarizer intermediate 30a-30d ... end face of polarizing plate intermediate, 31 ... polarizing plate region, 3 ... liquid crystal panel, 4 ... liquid crystal cell.

Claims (11)

A method for producing a polarizing plate having an absorption axis,
A cutting step of cutting the first strip polarizing plate at a plurality of locations 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 polarizing plate region in the second band-shaped polarizing plate corresponding to the polarizing plate to be manufactured, wherein the direction of the absorption axis in the polarizing plate region is based on the direction of the absorption axis in the second band-shaped polarizing plate. A processing step of obtaining a polarizing plate by processing and removing each of the second strip-shaped polarizing plates, the polarizing plate region facing the design direction of the absorption axis in the polarizing plate to be performed;
The manufacturing method of a polarizing plate provided with. In the cutting step, the first raw 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 respectively wound in a roll shape. Obtaining the plurality of second strip-shaped polarizing plates as a second raw fabric roll,
The manufacturing method of the polarizing plate of Claim 1. In the processing step, cutting at least one second band-shaped polarizing plate among the plurality of second band-shaped polarizing plates to cut out the polarizing plate region from the at least one second band-shaped polarizing plate,
The manufacturing method of the polarizing plate of Claim 1 or 2. The processing step is
An intermediate cutting step of cutting out a polarizing plate intermediate including the polarizing plate region from at least one second band-shaped polarizing plate among the plurality of second band-shaped polarizing plates;
An intermediate processing step of taking out the polarizing plate region from the polarizing plate intermediate by processing the polarizing plate intermediate cut out in the intermediate cutting step,
Having
The manufacturing method of the polarizing plate of Claim 1 or 2. In the intermediate processing step, by scraping the polarizing plate region from the polarizing plate intermediate by processing the end face of the polarizing plate intermediate,
The manufacturing method of the polarizing plate of Claim 4. In the cutting step, at least three second strip polarizing plates are obtained from the first strip polarizing plate.
The manufacturing method of the polarizing plate as described in any one of Claims 1-5. In the cutting step, the first strip shape is such that the direction of the absorption axis in each of the second strip polarizing plates to be obtained is within an allowable range with respect to the direction of the reference absorption axis in each of the second strip polarizing plates. Based on the axial angle data indicating the distribution of the direction of the absorption axis in the width direction of the polarizing plate, the first strip-shaped polarizing plate is cut at a plurality of locations in the width direction.
The manufacturing method of the polarizing plate as described in any one of Claims 1-6. The width of the first strip-shaped polarizing plate is 1000 mm or more.
The manufacturing method of the polarizing plate as described in any one of Claims 1-7. The planar view shape of the polarizing plate is rectangular or square,
The length of the diagonal line of the polarizing plate is 350 mm or less,
The manufacturing method of the polarizing plate as described in any one of Claims 1-8.   The said polarizing plate is a manufacturing method of the polarizing plate as described in any one of Claims 1-9 which is a polarizing plate for liquid crystal panels of a VA type or an IPS type. A polarizing plate is produced by the method for producing a polarizing plate according to any one of claims 1 to 10, and a liquid crystal panel is produced by bonding the obtained polarizing plate to a liquid crystal cell.
A method for manufacturing a liquid crystal panel.

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