JP2005148168A - Polarizing plate, its machining method, and liquid crystal display device and its machining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a liquid crystal display device capable of performing excellent display even when a foreign matter exists on a polarizing plate, and the polarizing plate. <P>SOLUTION: The machining method for the polarizing plate is a method for machining the polarizing plate 100 having a polarizing layer 111 inside, and includes a small-diameter hole part forming process for forming a hole part 130 on the polarizing plate 100 by laser beam machining on a faulty display area where the foreign matter 200 exists, a large-diameter hole part forming process for forming a large-diameter hole part 140 having a larger diameter than the hole part 130 formed in the small-diameter hole part forming process by removing a part which does not reach the layer 111 by the laser beam machining, and a light shielding forming process for embedding a light shielding member 150 in the hole parts formed in the respective processes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polarizing plate and a liquid crystal display device, and more particularly, for example, in a liquid crystal display device in which a polarizing plate is attached to a liquid crystal panel via an adhesive layer, and is suitable for a defect correction method when foreign matter is present. Is.

  Conventionally, after sticking a polarizing plate to a panel, it is inspected whether or not there is a foreign substance that becomes a bright spot. If there is a foreign substance that becomes a bright spot, the area where the foreign substance exists (defective display area) Are known so that the bright spot is not visible to the viewer by performing a surface treatment such as forming a light shielding film on the surface of the polarizing plate (see Patent Documents 1 to 3).

  According to such a method, foreign objects are not visually recognized when viewed from the front, but when viewed from an oblique direction, the foreign objects are visually recognized, resulting in a disadvantage that a good display cannot be obtained. .

In addition, there is a method in which a hole is formed in the polarizing plate in a region where foreign matter exists by laser processing, and a light shielding member is embedded in the hole (see Patent Documents 4 and 5). In this method, as shown in FIG. 6, a hole 130 is formed such that the foreign matter 200 of the polarizing plate 100 adhered to the panel P via the adhesive layer 120 is removed by laser processing, and the hole 130 is formed in the hole 130. Although the light shielding resin 150 is embedded, there is a case where sufficient display cannot be obtained even by this method. That is, when the foreign material 200 is below the polarizing layer 111 of the polarizing plate 100, it is necessary to penetrate the polarizing layer 111 by laser processing. When penetrating the polarizing layer 111, it is affected by laser processing. This is because the polarizing layer 111 around the hole 130 is damaged and light leaks from this portion.
JP-A-6-1775096 JP-A-7-181438 JP 11-31806 A JP-A-5-2160 JP 2001-255525 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of performing good display even when foreign matter is present on the polarizing plate, and polarized light There is to get a board.

  The processing method of a polarizing plate according to the present invention is a processing method of a polarizing plate having a polarizing layer therein, and a small-diameter hole forming procedure for forming a hole in the polarizing plate by laser processing in a defective display region, and the small diameter A large-diameter hole forming procedure for forming a large-diameter hole by removing a portion larger than the hole formed in the hole formation and reaching the polarizing layer by laser processing, and formed in each of the steps And a light shielding formation procedure for embedding a light shielding member in the hole.

  In addition, the processing method of the liquid crystal display device according to the present invention is a processing method of a liquid crystal display device in which a polarizing plate having a polarizing layer inside is attached to a panel, and is converted into a polarizing plate by laser processing in a defective display area. A small-diameter hole forming procedure for forming a hole, and a large-diameter hole by removing a portion larger than the hole formed in the small-diameter hole formation and not reaching the polarizing layer by laser processing. A radial hole forming procedure and a light shielding forming procedure for embedding a light shielding member in the hole formed in each of the above procedures are characterized.

  According to the processing method according to the present invention having the above-described configuration, when the hole is formed by laser processing through the polarizing layer in the small-diameter hole forming procedure, the polarization of the peripheral portion of the hole is formed by this laser processing. Although the layer is damaged, a hole having a larger diameter than the hole is formed in the large-diameter hole forming procedure, and a light shielding member is embedded in the large-diameter hole so that the damaged part of the polarizing layer is visually recognized. It can be prevented from being visually recognized by a person.

  In the processing method according to the present invention, the small-diameter hole forming procedure can be performed from the surface side of the polarizing plate (the side opposite to the surface to be bonded) after the polarizing plate is bonded to the panel. Moreover, it is also possible to perform the small diameter hole forming procedure before sticking the polarizing plate to the panel. In the latter case, laser processing is performed from the back side (surface to be adhered) of the polarizing plate, and laser processing is performed so that the hole does not penetrate to the surface (opposite surface to the surface to be adhered). It is preferable. The embedding of the light shielding member includes not only completely filling the hole with the light shielding member but also including a state in which the light shielding member is applied to the wall surface of the hole. In short, the hole is shielded by the light shielding member. It is enough if it is provided. Further, in the small diameter hole forming procedure, it is preferable to form the hole so as to remove the foreign matter in the polarizing plate, thereby reliably preventing the foreign matter in the polarizing plate from being viewed from an oblique direction. Can do.

  Further, in the processing method according to the present invention, in the large-diameter hole forming procedure, a larger hole is formed on the peripheral side at least 20 μm or more than the hole formed in the small-diameter hole forming procedure. More preferably, it is preferable to form it to 30 μm or more. Thereby, the damaged part of the polarizing layer can be made invisible from an oblique direction.

In the processing method according to the present invention, in the large diameter hole forming procedure, the distance from the polarizing layer is 30 μm.
It is preferable to form the hole portion within the range, more preferably within 10 μm. As described above, when the light shielding member embedded in the peripheral portion is close to the polarizing layer, the damaged portion of the polarizing layer can be made invisible from an oblique direction.

  Further, the polarizing plate according to the present invention has a polarizing layer inside, a small-diameter hole portion that penetrates the polarizing layer from one surface side to the other surface side, a diameter larger than the small-diameter hole portion, and does not reach the polarizing layer. A light-shielding member is embedded in the small-diameter hole and the large-diameter hole.

  Moreover, the liquid crystal display device according to the present invention is a liquid crystal display device in which a polarizing plate having a polarizing layer inside is attached to a panel, and the polarizing plate penetrates the polarizing layer from one side to the other side. And a large-diameter hole that has a larger diameter than the small-diameter hole and does not reach the polarizing layer, and a light-shielding member is embedded in the small-diameter hole and the large-diameter hole. It is characterized by.

  By adopting the above configuration, even if the small-diameter hole is provided through the polarizing layer and the polarizing layer around the small-diameter hole is damaged, the small-diameter hole has a larger diameter than the small-diameter hole and reaches the polarizing layer. Since the light shielding member is embedded in the non-large-diameter hole portion, the damaged portion of the polarizing layer can be prevented from being visually recognized by a viewer, and good display can be performed.

  In the present invention having the above-described configuration, the large-diameter hole is preferably larger than the small-diameter hole by at least 20 μm or more on the peripheral side, and more preferably by 30 μm or more. It is preferable. Thereby, the damaged part of the polarizing layer can be made invisible from an oblique direction.

  Moreover, it is preferable that the said large diameter hole part is provided in the distance with a polarizing layer within 30 micrometers, More preferably, it is preferable that it is provided within 10 micrometers. As described above, when the light shielding member embedded in the surrounding portion is close to the polarizing layer, the damaged portion of the polarizing layer can be prevented from being visually recognized from an oblique direction.

  As described above, according to the present invention, even if the small-diameter hole portion is formed by penetrating the polarizing layer at the location where the foreign substance exists, the peripheral portion of the small-diameter hole portion damaged during the formation is larger than the hole portion. Since it is shielded by the light shielding member embedded in the large-diameter hole portion formed in the diameter, the damaged portion of the polarizing layer can be prevented from being visually recognized by the viewer, and therefore, a good display can be performed. It has the effect.

  Hereinafter, a processing method of the liquid crystal display device according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view for explaining the processing method of the first embodiment. (A) shows a state in which foreign matter is mixed, and (B) shows a state after removing the foreign matter. (C) shows a state where a light shielding member is embedded in the formed hole. FIG. 2 is a front view for explaining the processing method of the first embodiment and shows a state in which the surrounding removal procedure is finished. 3 and 4 are schematic sectional views of other embodiments of the present invention, respectively. FIG. 5 is a schematic cross-sectional view of another embodiment of the present invention, where (A) shows a state after removing foreign matter, and (B) shows a light shielding member embedded in the formed hole. Indicates the state.

  The liquid crystal display device in Example 1 has a polarizing plate 100 attached to the surface of a liquid crystal panel P. The polarizing plate 100 includes a polarizing plate body 110 having a polarizing layer 111 therein, and the polarizing plate. The adhesive layer 120 is provided on the back surface of the main body 110, and is adhered to the liquid crystal panel P by the adhesive layer 120. The processing method (foreign matter removing method) of this example is good when the foreign matter 200 is mixed in the polarizing plate 100 of the liquid crystal display device as shown in FIG. It is for making a simple display. In the present embodiment, the polarizing plate body 110 is such that the polarizing layer 111 has a thickness of about 25 μm and the transparent resin layers 113 above and below each have a thickness of about 80 μm.

  The processing method of the present embodiment includes a foreign matter removing procedure (small diameter hole forming procedure) in which a hole 130 is formed in the polarizing plate 100 by laser processing in the presence region (defective display region) of the foreign material 200 and the foreign material 200 is removed. A peripheral removal procedure (large-diameter hole forming procedure) in which a portion having a diameter larger than the hole 130 formed in the procedure and not reaching the polarizing layer 111 is removed by laser processing to form the hole 140; A light shielding formation procedure for embedding the light shielding member 150 in the holes 130 and 140 formed in the procedure.

  First, in the foreign matter removing procedure, as shown in FIG. 1 (b), laser processing is performed from the surface side of the polarizing plate 100, and perforations 130 (hereinafter referred to as “small diameter holes”) Part)). As the laser used here, an ultraviolet laser is preferably used. In the illustrated example, the small-diameter hole portion 130 is formed through the polarizing plate body 110 to the adhesive layer 120. However, the small-diameter hole portion 130 is formed to a depth that allows the foreign matter 200 to be removed. It is also possible to perform laser processing so as not to occur. The depth of the small-diameter hole 130 can be adjusted by the number of laser shots and the energy per shot.

  Further, in the foreign matter removing procedure of the present embodiment, the small-diameter hole portion 130 is formed in a square shape in plan view and provided so that its diameter (one side) L1 is about 100 μm to 500 μm (see FIG. 2). In addition, the small diameter hole part 130 can also be provided in a substantially circular shape.

  The peripheral removal procedure is performed after the foreign matter removal procedure. The large-diameter hole 140 formed by the peripheral-removal procedure is provided larger on the peripheral side than the small-diameter hole 130. . Here, the large-diameter hole portion 140 is also formed in a square shape in plan view (see FIG. 2), and is formed to be 30 μm (L2) larger than the small-diameter hole portion 130. The large-diameter hole portion 140 is preferably provided so that the width is 600 μm or less as a whole. When the small diameter hole portion 130 is provided in a substantially circular shape, the large diameter hole portion 140 can also be provided in a substantially circular shape.

  Further, as shown in FIG. 1C, the depth of the large-diameter hole 140 does not reach the polarizing layer 111 and is provided so that the gap D with the polarizing layer 111 is 10 μm.

  The formation of the large-diameter hole 140 can be performed by laser processing similar to the formation of the small-diameter hole 130.

  In the place where the large diameter hole 140 and the small diameter hole 130 are formed as described above, the light shielding member 150 is embedded in the light shielding formation procedure. Here, as the light shielding member 150, for example, black ink made of carbon, a solvent, and a resin material (such as an acrylic vinyl resin or an epoxy resin) is preferably used. Note that the color of the material is not necessarily black as long as it has a light shielding function. Moreover, as this embedding method, an inkjet system or a dispenser system is preferably used.

  In the liquid crystal display device processed by the above processing method, the polarizing plate 100 has a small-diameter hole portion 130 that penetrates the polarizing layer 111 from the surface side to the panel P side, and a larger diameter than the small-diameter hole portion 130. The large-diameter hole portion 140 does not reach the polarizing layer 111, and the light-shielding member 150 is embedded in the small-diameter hole portion 130 and the large-diameter hole portion 140.

  According to the liquid crystal display device, it is possible to prevent the foreign matter 200 discovered after the polarizing plate 100 is bonded from being a bright spot and causing a defective display. Further, when the foreign matter 200 is removed, the polarizing layer 111 is damaged in a range of about 10 μm around the small-diameter hole 130 by laser processing, but the light-shielding member of the large-diameter hole 140 serves as the damaged polarizing layer 111. Therefore, a good display can be performed.

  In addition, since the said Example was comprised as mentioned above, it had the above-mentioned advantage, However, This invention is not limited to the structure of the said Example, The range which this invention intends The design can be changed appropriately.

  That is, in the above embodiment, the bottom of the large-diameter hole 140 is illustrated as being substantially parallel to the polarizing layer 111. However, the present invention is not limited to this, and for example, FIG. 3 and FIG. As shown in FIG. 5, it is also possible to change the design as appropriate to provide the bottom of the large-diameter hole 140 with an inclination with respect to the polarizing layer 111. Note that the large-diameter hole portion 140 shown in FIG. 3 has a shape that becomes shallower as it goes around, and the large-diameter hole portion 140 shown in FIG. 4 has a shape that becomes deeper as it goes around.

  Moreover, in the said Example, since the foreign material 200 was removed after affixing the polarizing plate 100 to the panel P, it had the advantage that the foreign material 200 adhering at the time of bonding could also be removed. However, it is also possible to employ the same processing method as described above before the polarizing plate 100 is attached to the panel P, that is, for example, in a state where the separator 300 is attached to the adhesive layer 120 of the polarizing plate 100. Each procedure such as a foreign matter removal procedure can also be performed (see FIG. 5). In this case, as shown in FIG. 5A, it is preferable to remove the foreign substance 200 from the polarizing plate 100 from the adhesive layer 120 side (separator 300 side). In this way, when the foreign matter removal procedure is performed by laser processing from the adhesive layer 120 side, the surrounding removal procedure is performed by laser processing from the adhesive layer 120 side as shown in FIG. The light shielding member 150 is preferably embedded in the large-diameter hole portion 140 and the small-diameter hole portion 130. In this light shielding formation procedure, it is preferable to embed the light shielding member 150 up to the adhesive layer 120 portion without embedding it in the separator portion.

  Furthermore, although the said Example demonstrated the thing in which the small diameter hole part 130 penetrates the polarizing plate 100, this invention is not limited to the thing in which the small diameter hole part 130 penetrates the polarizing plate 100. . In the above embodiment, the small diameter hole portion 130 is formed so as to remove the foreign matter 200. However, the removal of the foreign matter 200 is not an essential requirement in this small diameter hole portion forming procedure. It is sufficient that the portion 130 is formed in the defective display area.

  Further, in the above-described embodiment, the description has been made of the peripheral removal procedure after the foreign matter removal procedure. However, the small-diameter hole formation procedure can be performed first after the large-diameter hole formation procedure, or both procedures can be performed. It is also within the intended scope of the present invention to perform the laser processing once.

It is a schematic sectional drawing for demonstrating the processing method of Example 1 of this invention, (A) shows the state in which the foreign material was mixed, (B) shows the state after removing the foreign material, ) Shows a state in which a light shielding member is embedded in the formed hole. It is a front view for demonstrating the processing method of the Example 1, and shows the state which complete | finished the periphery removal procedure. It is a schematic sectional drawing of the liquid crystal display device of the other Example of this invention. It is a schematic sectional drawing of the liquid crystal display device of the other Example of this invention. It is a schematic sectional drawing for demonstrating the processing method of the other Example of this invention, (A) shows the state after removing a foreign material, (B) is a light shielding member in the formed hole. Shows the state of embedded. It is a schematic sectional drawing for demonstrating the conventional processing method, (A) shows the state before a process, (B) shows the state after a process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Polarizing plate 110 Polarizing plate main body 111 Polarizing layer 113 Resin layer 120 Adhesive layer 130 Small diameter hole part 140 Large diameter hole part 150 Light shielding member 200 Foreign material 300 Separator

Claims (14)

A method of processing a polarizing plate having a polarizing layer therein,
A small-diameter hole forming procedure for forming a hole in the polarizing plate by laser processing in the defective display area;
A large-diameter hole forming procedure for forming a large-diameter hole by removing a portion having a larger diameter than the hole formed in the small-diameter hole formation and not reaching the polarizing layer by laser processing;
A method for processing a polarizing plate, comprising: a light shielding formation procedure for embedding a light shielding member in the hole formed in each of the procedures. It is a processing method of the polarizing plate of Claim 1, Comprising:
The method for processing a polarizing plate, wherein, in the large-diameter hole forming procedure, a hole having a size larger than the hole formed in the small-diameter hole forming procedure is formed at least 20 μm or more on the peripheral side. It is a processing method of the polarizing plate of Claim 1 or 2, Comprising:
In the large-diameter hole forming procedure, the hole is formed up to a distance of 30 μm or less from the polarizing layer. A polarizing plate processed by the processing method according to claim 1. A polarizing plate having a polarizing layer therein,
A small-diameter hole that penetrates the polarizing layer from one side to the other side;
A large-diameter hole that has a larger diameter than the small-diameter hole and does not reach the polarizing layer;
A polarizing plate, wherein a light shielding member is embedded in the small diameter hole portion and the large diameter hole portion. The polarizing plate according to claim 5,
The large-diameter hole is larger than the small-diameter hole by at least 20 μm or more on the peripheral side. The polarizing plate according to claim 5 or 6,
The large-diameter hole is provided with a distance from the polarizing layer within 30 μm. A processing method of a liquid crystal display device in which a polarizing plate having a polarizing layer inside is adhered to a panel,
A small-diameter hole forming procedure for forming a hole in the polarizing plate by laser processing in the defective display area;
A large-diameter hole forming procedure for forming a large-diameter hole by removing a part larger than the hole formed in the small-diameter hole formation and reaching the polarizing layer by laser processing;
A processing method for a liquid crystal display device, comprising: a light shielding formation procedure for embedding a light shielding member in the hole formed in each of the procedures. A method for processing a liquid crystal display device according to claim 8,
The method for processing a polarizing plate, wherein, in the large-diameter hole forming procedure, a large hole is formed on the peripheral side at least 20 μm or more than the hole formed in the small-diameter hole forming procedure. A method of processing a liquid crystal display device according to claim 8 or 9,
In the large-diameter hole forming procedure, the hole is formed up to a distance of 30 μm or less from the polarizing layer. A liquid crystal display device processed by the method for processing a liquid crystal display device according to claim 8. A liquid crystal display device in which a polarizing plate having a polarizing layer inside is attached to a panel,
The polarizing plate has a small-diameter hole that penetrates the polarizing layer from one side to the other side, and a large-diameter hole that has a larger diameter than the small-diameter hole and does not reach the polarizing layer.
A liquid crystal display device, wherein a light shielding member is embedded in the small diameter hole portion and the large diameter hole portion. The liquid crystal display device according to claim 12,
The liquid crystal display device, wherein the large-diameter hole portion is larger than the small-diameter hole portion by at least 20 μm or more on the peripheral side. The liquid crystal display device according to claim 12 or 13,
The liquid crystal display device, wherein the large-diameter hole portion is provided with a distance from the polarizing layer within 30 μm.

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