JPH10307207A - Manufacture of polarizing plate, and polarizing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacture of the polarizing plate which make easy and highly reliable the inspection of a foreign body and a defect and lowers a defective overlooking rate due to the overlooking of a foreign body and a defect. SOLUTION: When a polarizing plate for a liquid crystal display panel formed by sticking protection films on both the sides of a polarizing film 5 is manufactured, an opening part formation protection film 13 having an opening part 13 in an area corresponding to the effective area of the liquid crystal display panel is stuck on one surface and an opening part formation release film 12 having an opening part 12a in an area corresponding to the effective area of the liquid crystal panel is stuck on the other surface. Then while those films 12 and 13 are stuck, foreign body and defect inspection of the polarizing film between those films is performed. Then different protection films are stuck on those films 12 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a polarizing plate used for a liquid crystal display device and the like, and a polarizing plate.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing a polarizing plate of this type, for example, methods shown in FIGS. 3 (a) to 3 (f) are known. This manufacturing method is a method for manufacturing a polarizing plate provided with an antireflection film. First, as shown in FIG. 3A, a transparent cellulose triacetate film (hereinafter referred to as T
AC film 1a) and another TAC film 1b having a hard coat film 2 formed by hard coating with a transparent acrylic resin, and further containing polyiodine included in uniaxially stretched polyvinyl alcohol An iodine-based polarizer 3 composed of ions or a dye-based polarizer 3 composed of a water-soluble dichroic dye bonded to uniaxially stretched polyvinyl alcohol with its affinity is prepared. The TAC film 1a, the TAC film 1b on which the hard coat film 2 is formed, and the polarizer 3 are all prepared in a form wound in a roll.

[0003] Next, as shown in FIG.
Are pressed and bonded to each other in a state where they are sandwiched between TAC films 1a and 1b to form a polarizer 4. This polarizer 4
, A structure composed of three layers of a TAC film 1a, a polarizer 3, and a TAC film 1b is referred to as a polarizing film 5. Subsequently, the polarizer 4 obtained as shown in FIG.
Protective film 6 on the TAC film 1a side
a, and the protective film 6b is laminated on the hard coat film 2 on the TAC film 1b side.

Next, as shown in FIG. 3D, the protective film 6a on the TAC film 1a side is peeled off, and a release film 8 coated with an adhesive 7 on the TAC film 1a side is pressure bonded. Thus, an intermediate 9 of the polarizing plate to be manufactured is obtained. Subsequently, the intermediate body 9 of the polarizing plate thus formed is cut into a predetermined size, for example, 200 × 200 (mm) to obtain a large sheet (not shown). Next, the protective film 6b on the hard coat film 2 side of the large sheet
Is peeled off, and on the exposed hard coat film 2, FIG.
As shown in (e), an anti-reflection film (Anti-Reflection; hereinafter, referred to as an AR film) 10 is formed by a vapor deposition method or the like.

After the AR film 10 is formed in this manner,
An inspection is performed to determine whether foreign matter has entered or a defect has occurred in the steps up to this point. In this inspection, that is, in the foreign particle defect inspection, cracks in the hard coat film 2 and hard coat film 2
Defect due to foreign matter in the inside, foreign matter in the polarizer 3,
The presence or absence of foreign matter in the TAC films 1a and 1b, foreign matter between the polarizer 3 and the TAC film 1a (1b), and foreign matter between the hard coat film 2 and the AR film 10 are examined. In performing such a foreign matter defect inspection, reflected light and transmitted light of an appropriate amount and color are used, and the inspected object is irradiated with the reflected light and the transmitted light to inspect for defective items such as the presence of the above-mentioned defect or foreign matter. This is performed with the naked eye, a stereoscopic microscope, a projector, or the like, and a portion where a defect or a foreign substance is detected is marked with hydraulic ink or the like. When inspecting with a stereoscopic microscope, the magnification is about 3 to 10 times, and when inspecting with a projector, the magnification is about 6 to 10 times.

[0006] Next, as shown in FIG. 3 (f), a protective film 6 c is bonded on the AR film 10, and the obtained intermediate (not shown) is strip-shaped or chip-sized with predetermined dimensions, for example. Cut to 22.5 x 32.5 (mm). Then, from the obtained strip-size or chip-size intermediate body 11, those having a portion marked by the foreign matter defect inspection are removed, and the final inspection of the remaining intermediate body 11 for cut surfaces, foreign matter, defects, and the like is performed. Done, and after this,
Finally, a polarizing plate is obtained.

[0007]

However, such a manufacturing method has the following disadvantages. When a foreign matter defect inspection is performed, since the release film 8 is bonded to the inspection object shown in FIG. 3E, reflected light or transmitted light used for the inspection is scattered by the release film 8. In addition, foreign substances and defects are hard to be detected, and therefore, the outflow rate of defective products to the subsequent process due to oversight of foreign substances and defects increases. That is, since the release film 8 is usually made of a PET (polyethylene terephthalate) film, defects and scratches are generated during the manufacturing process and remain as it is, and this causes reflected light and transmitted light to be scattered. is there. In particular, in the case of the type in which the AR film 10 is formed as in the above-described example, or in the case of having a (1/2) λ retardation plate, the structure is complicated, so that it becomes more difficult to see and the outflow rate of defectives increases. .

In addition, the hard coat film 2 or A
Since the R film 10 is formed, the outer surface side of the AR film 10 becomes concave due to the compressive stress caused by the difference in thermal expansion coefficient between these films 2 and 10 and the polarizing film 5 and the release film 8. The test object is bent. Then, since the object to be inspected is a large sheet having a size of, for example, 200 × 200 mm, particularly when the reflected light and the transmitted light are irradiated, a portion where these lights are not irradiated at an appropriate angle occurs, thereby making the inspection difficult. As a result, the rate of defective outflow to the subsequent process due to oversight of foreign matter and defects increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make inspection of foreign substances and defects easy and highly reliable, thereby enabling a post-process by overlooking foreign substances and defects. It is an object of the present invention to provide a method of manufacturing a polarizing plate capable of lowering the defective outflow rate of a polarizing plate, and a polarizing plate obtained by the manufacturing method.

[0010]

Means for Solving the Problems Claim 1 of the present invention
In the method for manufacturing a polarizing plate according to the description, when manufacturing a polarizing plate for a liquid crystal display panel in which protective films are bonded to both sides of the polarizing film, in the polarizing film, an area corresponding to an effective area of the liquid crystal display panel An opening forming protective film having an opening is bonded to one surface, and an opening forming release film having an opening in a region corresponding to an effective region of the liquid crystal display panel is bonded to the other surface. Then, in a state where the opening-forming protective film and the opening-forming release film are bonded together, the gap between the opening of the opening-forming protective film and the opening of the opening-forming release film is bonded. Inspection of the foreign matter defect of the polarizing film in the above, after that, a separate protective film on the opening forming protective film and on the opening forming release film, respectively. It was the solution means of the serial task.

According to this method of manufacturing a polarizing plate, the opening of the opening-forming protective film and the opening of the opening-forming releasing film are bonded together with the opening-forming protective film and the opening-forming release film bonded together. Inspection of the foreign matter of the polarizing film between the part and the inspection part, the inspection is performed in a state where the release film and the protective film are not present in the inspection target part. There is no scattering of light, and there is no protective film. Therefore, there is no scattering of light. Therefore, it is possible to prevent the foreign matter and the defect from being hardly detected due to such scattering of light.

When the polarizing plate is formed by forming a hard coat film and an AR film on a polarizing film, a foreign material defect inspection of the polarizing film is performed by using the hard coat film and the AR film. Perform in a state where If the foreign substance defect inspection is performed in this manner, it is possible to inspect foreign substances and defects including the hard coat film and the AR film. In addition, if the polarizing film is inspected for foreign matter defects by using a flattening jig to make the polarizing film flat, even if the polarizing film is bent in a concave shape due to compressive stress caused by a hard coat film or an AR film in the polarizing plate, By flattening this, it becomes possible to irradiate light at an appropriate angle on the whole, thereby facilitating inspection and increasing its reliability.

A polarizing plate according to claim 17, which is a polarizing plate for a liquid crystal display panel in which protective films are bonded to both sides of a polarizing film, wherein the effective area of the liquid crystal display panel in the polarizing film. An opening forming protective film having an opening in an area corresponding to the above is bonded to one surface of the polarizing film, and an opening forming separation having an opening in an area corresponding to an effective area of the liquid crystal display panel. The solution to the above problem is that a mold film is bonded to the other surface of the polarizing film, and another protective film is bonded to the opening forming protective film and the opening release film. did.

According to this polarizing plate, an opening-forming protective film having an opening in a region of the polarizing film corresponding to the effective region of the liquid crystal display panel is bonded to one surface of the polarizing film, and Since the opening-forming release film having an opening in an area corresponding to the effective area of the liquid crystal display panel is bonded to the other surface of the polarizing film, in manufacturing the opening film, the opening-forming protection is required. Foreign matter of the polarizing film between the opening of the opening-forming protective film and the opening of the opening-forming releasing film in the state described above before bonding another protective film on the film and on the opening releasing film. If a defect inspection is performed, the inspection is performed without a release film or a protective film in the inspected portion, and thus the release mold is removed as in the conventional case. No scattering of light by Lum, further protective film even without scattering of light by this because it is not, therefore foreign substances and defects is prevented that hard to be detected by the scattering of such light.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
1 (a) to 1 (h) and 2 (a) to 2 (f) show a method for manufacturing a polarizing plate of the present invention, which is used for a liquid crystal display panel.
FIG. 7 is a diagram for explaining an embodiment of the present invention when applied to a method for manufacturing a polarizing plate having a film. In addition, FIG.
(H) and FIGS. 3 (a) to 3 (f) in FIGS.
The same components as those shown in (f) are denoted by the same reference numerals.

First, in the same manner as in the prior art, as shown in FIG. 1A, a transparent TAC film (protective layer) 1a having a thickness of about 75 μm and another TAC film having a hard coat film 2 formed thereon.
A film (protective layer) 1b is prepared, and a polarizer 3 made of polyvinyl alcohol is prepared. Here, the hard coat film 2 is formed by coating a transparent acrylic resin on the TAC film 1b and curing it by a UV (ultraviolet) irradiation curing method or a low-temperature curing method. Further, the polarizer 3 is one in which polyvinyl alcohol (PVA), which is uniaxially polarized under predetermined conditions, is dyed with iodine or a dye, thereby imparting polarization characteristics.

Next, in the same manner as in the prior art, the polarizer 3 is pressure-bonded with the polarizer 3 sandwiched between the TAC films 1a and 1b as shown in FIG. Subsequently, in the polarizer 4 obtained as shown in FIG. 1C, the protective film 6a is bonded to the surface on the TAC film 1a side, and the protective film 6b is formed on the hard coat film 2 on the TAC film 1b side. To form a polarizing plate intermediate (not shown). Here, the protective films 6a, 6
As b, a PET film with an adhesive or an adhesive tape is used.

Next, in the same manner as in the prior art, as shown in FIG. 1D, the protective film 6a on the TAC film 1a side is formed.
Is peeled off, and a release film 8 coated with an adhesive 7 is pressure-bonded to the surface on the TAC film 1a side to obtain a polarizing plate intermediate 9 to be produced. Subsequently, the thus-formed polarizing plate intermediate body 9 is cured for about 7 days in an environment of about 35 to 40 ° C. to increase the adhesive strength (adhesive strength) between the adhesive 7 and the TAC film 1a. Keep it. By thus increasing the adhesive strength, when the release film 8 is later peeled, the release film 8 can be peeled from the TAC film 1a while the adhesive 7 remains on the TAC film 1a. The interface between the release film 8 and the pressure-sensitive adhesive 7 is coated with a silicone release agent and subjected to a release treatment, whereby the release property of the release film 8 is enhanced.

Next, the thus formed intermediate 9
Is cut into a predetermined size, for example, 200 × 200 (mm),
It is a large sheet (not shown). Next, the protective film 6b on the hard coat film 2 side of the large sheet is peeled off, and an AR film 10 (anti-reflection film) is formed on the exposed hard coat film 2 by an evaporation method as shown in FIG. Formed by Here, the AR film 10 is made of an inorganic compound having various refractive indexes, for example, SiO ₂ , TiO ₂ , Z
rO ₂ is deposited to a thickness of about 0.1 to 0.2 μm, that is, a 波長 wavelength thickness, and is further formed by laminating a plurality of layers, or an inorganic or organic fluorine compound or the like. It is formed by coating a low refractive index material.

After the AR film 10 is formed in this manner,
The release film 8 on the TAC film 1a side was peeled off, and FIG.
As shown in (f), the opening-forming release film 12 prepared in advance on the adhesive 7 on the outer surface of the TAC film 1a is bonded and prepared on the outer surface of the AR film 10 in advance. The opening forming protective film 13 is bonded. The opening-forming release film 12 and the opening-forming protective film 13 have openings 12a (13a) in a region corresponding to an effective region of a liquid crystal display panel to which a polarizing plate obtained by the method of the present invention is attached. Have

That is, in this example, as shown in FIG. 1 (g), the release film 15 bonded through the adhesive 14 is used.
As shown in FIG. 1 (h), a laminated film 17 composed of a protective film 16 and a substantially rectangular area in a plan view corresponding to an effective area of the liquid crystal display panel is punched out to form openings 12a and 13a. By being formed, the opening forming release film 12 and the opening forming protective film 13 are formed at the same time. Then, the opening-forming release film 12 and the opening-forming protective film 13 formed by punching out in this way are separated from the adhesive 14 by the opening-forming release film 12 and the TAC film 1a as described above. On the other hand, the opening forming protective film 13 is bonded to the outer surface of the AR film 10 by the remaining adhesive 14 as described above.

In this manner, the opening-forming release film 1 is formed.
2 and the opening-forming protective film 13 are bonded by pressure bonding, and in this state, a portion to be inspected is formed between the opening 12a of the opening-forming release film 12 and the opening 13a of the opening-forming protective film. Inspection is performed to check whether foreign matter is mixed or a defect is not generated in the steps up to. Here, in this foreign matter defect inspection, cracks in the hard coat film 2, defects due to foreign matter entering into the hard coat film 2, foreign matter entering into the polarizer 3, TAC films 1a and 1
b, contamination of the polarizer 3 and the TAC film 1a (1
b) foreign matter mixed in between hard coat film 2 and AR film 1
A check is made to determine whether or not there is a foreign substance in the gap between zero. In performing such a foreign substance defect inspection, reflected light and transmitted light of an appropriate amount and color (for example, white light or green light) are used as shown by arrows in FIG. Irradiation is performed on the inspection object to inspect for defective items such as the presence or absence of the above-described defect or foreign matter by using a projector, a stereoscopic microscope, or naked eyes.
Then, a mark where a defect or a foreign substance is detected is marked with magic ink or dot ink.

In this foreign particle defect inspection, a state in which the opening-forming release film 12 and the opening-forming protective film 13 to be inspected are pressure-bonded is flattened using a flattening jig. Perform in the state. As the flattening jig, for example, a flat square frame-shaped frame body having one side adhered or coated with a double-sided tape or an adhesive, or a flat square transparent glass plate or a transparent hard resin plate A double-sided tape or a pressure-sensitive adhesive is adhered or coated on the four sides of one side of the substrate. Then, in order to perform the inspection using such a flattening jig, the four circumferences of one surface of the above-mentioned state are placed on the flattening jig,
Further, the four circumferences are fixed on a double-sided tape or an adhesive of a flattening jig to correct the concave bending of the large sheet and flatten it.

When the defect inspection is performed as described above, the opening-forming release film 12 and the opening-forming protective film 13 are bonded to a large sheet to be inspected, that is, the polarizer 4 on which the AR film 10 is formed. Fig. 3
Unlike the conventional case shown in (e), the release film 8 is provided between the opening 12a and the opening 13a which are the portions to be inspected.
Since there is no protective film 6a and no protective film 6a, there is no light scattering caused by the release film 8 and the protective film 6a. Therefore, such light scattering may make it difficult to detect a foreign substance or a defect. Can be prevented. In addition, since the large sheet is flattened using a flattening jig, the hard coat film 2 and the AR
Even if the film 10 is bent in a concave shape due to the compressive stress, light can be applied to the whole at an appropriate angle by flattening the film 10 with a flattening jig.

When the inspection for foreign matter defects is completed in this way, the large sheet is peeled off from the flattening jig, and FIG.
As shown in (a), a protective film 18a with an adhesive is pressure-bonded to the outer surface of the opening-forming release film 12, and a protective film 18b with an adhesive is pressure-bonded to the outer surface of the opening-forming protective film 13. Paste. At this time,
TAC film 1a or opening forming release film 1
2 and the protective film 18a, and between the AR film 10 or the opening-forming release film 13 and the protective film 18b.
Be very careful about the environment and work methods so that no foreign matter is caught in the space.

Next, in accordance with the size of the liquid crystal display panel, that is, including the openings 12a (13a) having a size corresponding to the effective area of the liquid crystal display panel, the size is slightly increased. 2 (a), the large sheet is cut at a position indicated by a dashed line, cut into a chip of a predetermined size, and as shown in FIG. 2 (b), an embodiment of the invention according to claim 7 in the present invention. A polarizing plate 19 serving as an example product is obtained. The polarizing plate 1 obtained in this manner was used.
9 out of which there is a portion marked in the above foreign matter defect inspection, and further, the remaining polarizing plate 19 is also subjected to a final inspection for a cut surface, foreign matter, defects, etc. As the polarizing plate 19.

Further, the polarizing plate 19 thus obtained is obtained.
In order to press-bond the adhesive on the liquid crystal display panel, as shown in FIG. 7, a panel 22 composed of a liquid crystal drive substrate 20 and a counter substrate 21 prepared in advance.
To the counter substrate 21 side. Regarding the positioning at this time, the opening forming release film 1 in the polarizing plate 19 is used.
2 opening 12a and opening forming protective film 13
The opening 13a is made to coincide with the effective area of the panel 22. Furthermore, the polarizing plate 19 is similarly bonded to the liquid crystal driving substrate 20 so as to match the absorption axis of the polarizing plate 19 on the counter substrate 21 side, but is not shown.

Further, the polarizing plate 19 thus obtained is obtained.
In the case of labeling, as shown in FIG.
A double-sided tape 24 is bonded in advance on the upper surface of the carrier tape 23 made of an ET film or the like, and FIG.
Is placed with the outer surface of the protective film 18a on the side of the TAC film 1a facing down, and bonded in that state. That is, as shown in FIG. 2E, a wide carrier tape 23 is prepared, and a pair of double-sided tapes 24, 24 are pasted in a rail shape along the length direction of the carrier tape 23. The polarizing plate 19 is placed and bonded in a state where the polarizing plate 19 is straddled.

When mounting directly on the carrier tape 23 without using the double-sided tape 24, FIG.
(B) The protective film 18a on the TAC film 1a side from the polarizing plate 19 shown in FIG.
Is peeled off, and the surface on the side of the adhesive 7 is bonded to the carrier tape 23 using the adhesive 7 remaining on the TAC film 1a. In this case, for example, a silicone-based release agent is applied to the surface of the carrier tape 23 and subjected to a release treatment, whereby the carrier tape 23 can be easily peeled off from the adhesive 7 remaining on the TAC film 1a. It has become.

In the method for manufacturing the polarizing plate 19, the opening 13a of the opening-forming protective film 13 and the opening 13a of the opening-forming protective film 13 are bonded together with the opening-forming protective film 13 and the opening-forming release film 12. Since the defect inspection of the polarizer 4 between the opening 12a of the opening-forming release film 12 and the opening 12a is performed, the release film (the opening-forming release film 12) and the protective film ( The inspection is performed in the absence of the opening-forming protective film 13), and therefore, there is no light scattering by the release film as in the conventional case, and further, since there is no protective film, there is no light scattering by this. Such scattering of light can prevent foreign substances and defects from being hardly detected. Therefore, according to such a manufacturing method, the TAC films 1a and 1b are formed in the polarizer 3 by the reflected light and the transmitted light.
It is easy to determine a defect such as a foreign substance in the inside, a foreign substance sandwiched between the polarizer 3 and the TAC films 1a and 1b, and discoloration, thereby reducing a defective product outflow rate to a subsequent process. Further, since the large sheet is flattened using the flattening jig, even if the large sheet is bent in a concave shape due to the compressive stress of the hard coat film 2 or the AR film 10 in the large sheet, this is fixed by the flattening jig. By flattening, light can be applied to the whole at an appropriate angle.

Further, the polarizing plate 19 thus obtained is obtained.
As described above, when manufacturing this as described above, the inspection of the inspected portion is performed without the release film and further the protective film, so that foreign matter and defects are detected by light scattering. It has been prevented from becoming difficult. Therefore, since the polarizing plate 19 is obtained through such an inspection, the quality of the polarizing plate 19 is high and the yield is good even in the manufacture thereof.

In the above embodiment, the method of manufacturing the polarizing plate provided with the anti-reflection film (AR film 10) and the polarizing plate 19 have been described. However, the present invention is not limited to this. It can also be applied to a method for manufacturing a general-purpose polarizing plate not provided, in which case, the step of forming the AR film 10 is omitted, and other steps, for example, inspection of foreign matter defects, etc., are performed in the same procedure as in the above embodiment. What should be done is:

[0033]

As described above, the method for manufacturing a polarizing plate of the present invention provides a method for manufacturing a polarizing plate in which an opening-forming protective film and an opening-forming release film are bonded to each other, and the opening and the opening of the opening-forming protective film are bonded together. In this method, the inspection is performed without the release film and further the protective film in the inspected portion, since the defect inspection of the polarizing film is performed between the opening of the part forming release film and the opening of the parting release film. Therefore, there is no light scattering due to the release film as in the related art, and there is no light scattering due to the absence of the protective film.Therefore, such light scattering makes it difficult for foreign substances and defects to be detected. Is prevented. Therefore, such light scattering makes it difficult to detect a foreign substance or a defect, thereby preventing an inspection from being overlooked.
As a result, it is possible to reduce the outflow rate of defective products to a subsequent process due to oversight of foreign matter and defects. Therefore, by reducing the outflow rate of defective products to the post-process, it is possible to improve the yield in the mounting process of the liquid crystal display device, the quality of the polarizing plate, the quality of the customer, and further reduce the cost. Can be. In addition, since there is no protective film and release film that are difficult to see during the inspection, it is easy to determine a defect, thereby reducing man-hours by shortening the inspection time, improving productivity by reducing the TAT, and reducing costs. it can.

As described above, when the polarizing plate of the present invention is manufactured, since the inspection is performed without a release film and further without a protective film, foreign matter or defects due to light scattering can be obtained. Since it has been prevented from becoming difficult to detect, this polarizing plate has a high quality and a good yield in the production thereof by being obtained through such an inspection. Therefore, even in the inspection of the polarizing plate after bonding to the liquid crystal display panel, it is possible to reduce the defect of the foreign matter. Therefore, it is possible to improve the yield, the quality and the productivity of the liquid crystal display panel and realize the cost reduction. Can be.

[Brief description of the drawings]

FIGS. 1 (a) to 1 (h) are cross-sectional views of a principal part for describing an embodiment of a method for manufacturing a polarizing plate of the present invention in the order of steps.

FIGS. 2 (a) to 2 (f) are views for explaining an embodiment of the method for producing a polarizing plate of the present invention, and are side cross-sectional views of essential parts for explaining steps following FIG. It is.

FIGS. 3 (a) to 3 (f) are cross-sectional views of essential parts for explaining an example of a conventional method for manufacturing a polarizing plate in the order of steps.

[Explanation of symbols]

1a, 1b Cellulose triacetate film (TAC film; protective layer) 2 Hard coat film 3 Polarizer 4 Polarizer
Reference Signs List 5 polarizing film 6a, 6b, 6c protective film 10 anti-reflection film (AR film) 12 opening forming release film 12a opening 13 opening forming protecting film 13a opening 18a, 18b protective film 19 polarizing plate

Claims (16)

[Claims] 1. A method of manufacturing a polarizing plate for a liquid crystal display panel comprising a polarizing film and protective films attached to both sides of the polarizing film, wherein an opening is formed in a region of the polarizing film corresponding to an effective area of the liquid crystal display panel. Along with bonding the opening forming protective film having one side to the surface, the opening forming release film having an opening in a region corresponding to the effective area of the liquid crystal display panel is bonded to the other side surface. Then, the polarizing film between the opening of the opening forming protective film and the opening of the opening forming release film in a state where these opening forming protective film and the opening forming release film are bonded together. And then bonding another protective film on the opening-forming protective film and on the opening-forming release film, respectively. Light plate manufacturing method. 2. The method for manufacturing a polarizing plate according to claim 1, wherein the polarizing film comprises a polarizer and a pair of protective layers bonded to the polarizer with the polarizer sandwiched therebetween. . 3. The polarizing plate, wherein a hard coat film is formed between one of the protective layers in the polarizing film and the protective film, and the opening-forming protective film is formed on the side of the hard coat film. Aside from the hard coat film side, the opening forming release film is bonded to the surface opposite to the hard coat film side, and the foreign matter defect inspection of the polarizing film is performed in a state where the antireflection film is formed. 3. The method for producing a polarizing plate according to claim 2, wherein: 4. The polarizing plate, wherein an anti-reflection film is formed between the hard coat film and the opening-forming protective film, wherein the polarizing film is inspected for foreign matter defects, and the anti-reflection film is The method for producing a polarizing plate according to claim 3, wherein the method is performed in a state where the polarizing plate is formed. 5. The method for manufacturing a polarizing plate according to claim 1, wherein the defect inspection of the polarizing film is performed by making the polarizing film flat using a flattening jig. 6. The method of manufacturing a polarizing plate according to claim 2, wherein the inspection of the foreign matter of the polarizing film is performed by using a flattening jig to make the polarizing film flat. 7. The method for manufacturing a polarizing plate according to claim 3, wherein the inspection for the foreign matter defect of the polarizing film is performed by making the polarizing film and the hard coat film flat using a flattening jig. 8. The polarizing plate according to claim 4, wherein the defect inspection of the polarizing film is performed by using a flattening jig to make the polarizing film, the hard coat film and the antireflection film flat. Manufacturing method. 9. The method according to claim 1, wherein the defect inspection of the polarizing film is performed using reflected light and transmitted light. 10. A foreign matter defect inspection of the polarizing film,
The method according to claim 2, wherein the method is performed using reflected light and transmitted light. 11. A foreign matter defect inspection of the polarizing film,
The method according to claim 3, wherein the method is performed using reflected light and transmitted light. 12. A foreign matter defect inspection of the polarizing film,
The method for producing a polarizing plate according to claim 4, wherein the method is performed using reflected light and transmitted light. 13. A polarizing plate for a liquid crystal display panel comprising a polarizing film and protective films attached to both sides thereof, wherein the polarizing film has an opening in a region corresponding to an effective area of the liquid crystal display panel. An opening forming protective film is bonded to one side of the polarizing film,
An opening-forming release film having an opening in an area corresponding to an effective area of the liquid crystal display panel is bonded to the other surface of the polarizing film. A polarizing plate, wherein another protective film is stuck on the film. 14. The polarizing plate according to claim 13, wherein the polarizing film comprises a polarizer and a pair of protective layers bonded to the polarizer while sandwiching the polarizer. 15. The polarizing plate, wherein a hard coat film is formed between one protective layer of the polarizing film and the protective film, and the opening forming protective film is formed on the side of the hard coat film. The polarizing plate according to claim 14, wherein the polarizing film is bonded to a surface of the polarizing plate, and the opening-forming release film is bonded to a surface on a side opposite to the hard coat film side. 16. The polarizing plate according to claim 15, wherein the polarizing plate is formed by forming an antireflection film between the hard coat film and the opening-forming protective film.