TWI472752B - The layered layer of polarizing plate and the laminated system of polarizing plate - Google Patents

Description

Multilayer method of polarizing plate and laminated system of polarizing plate Field of invention

The present invention relates to a method of manufacturing a liquid crystal display device and a device for manufacturing a liquid crystal display device, and more particularly to a method of manufacturing a liquid crystal display device in which a liquid crystal cell and an optical film are attached to manufacture a liquid crystal display device And a manufacturing device of the liquid crystal display device.

Background of the invention

The liquid crystal display device is a liquid crystal display panel (liquid crystal display unit) which is configured by attaching a polarizing plate (polarizing member) to both sides of a liquid crystal cell formed by holding a liquid crystal layer on a pair of glass substrates. In the related art, a method of attaching a polarizing plate to a liquid crystal cell is known, as described in Patent Documents 1 to 3 below, in which a liquid crystal cell and a polarizing plate are fed between a pair of attaching rollers, and a polarizing plate is attached. The method of liquid crystal cells.

However, as described above, after the polarizing plate is bonded to both surfaces of the liquid crystal cell and the liquid crystal display panel is formed, an inspection step for checking whether the bonding state is defective or whether there is a defect due to adhesion of dust or the like is performed (panel inspection step). . This inspection is performed, for example, by reflecting light when the light is irradiated on the surface of the liquid crystal display panel or by transmitting light when the inside of the liquid crystal display panel is irradiated with light, and imaging the image data by a CCD camera or the like, and performing image analysis or the like.

Patent literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-37416

Patent Document 2: Japanese Patent Laid-Open Publication No. 2005-37418

Patent Document 3: Japanese Laid-Open Patent Publication No. 2006-39238

However, when the liquid crystal display panel manufactured by the conventional attaching step performs the panel inspection step, the alignment state of the liquid crystal changes for some reason, and the influence may adversely affect the reflected light or the transmitted light. Regardless of whether the above-mentioned defects or shortcomings do not actually exist, it is judged that the defect or the defect may cause so-called erroneous detection, and the panel inspection step cannot be performed correctly.

In particular, as disclosed in Patent Document 1 or Patent Document 2, such a problem is more apparent when the polarizing plate is continuously and automatically attached to the liquid crystal cell to manufacture the liquid crystal display panel at a high speed. When erroneous detection occurs in the panel inspection step, it is necessary to perform re-inspection or re-processing of the liquid crystal display panel (the process of attaching other polarizing plates after peeling off the polarizing plate), which is a factor of a decrease in yield ratio or a decrease in productivity.

As described later, the present inventors have found that if the interval (pitch) between the step of attaching the polarizing plate and the step of inspecting the panel is increased, the above-mentioned problem of erroneous detection can be solved, but the time required is prolonged, and as in Patent Document 1, In the automatic attaching method of the polarizing plate, the high-speed continuous manufacturability is impaired.

Further, the inventors have found that the above-mentioned problem of erroneous detection can be solved by weakening the pressing force of the attaching roller attached to the polarizing plate as will be described later, but it is caused by weakening the pressing force of the attaching roller. Bubble mixing liquid Other problems between the cell and the polarizer.

The present invention has been made in view of the above problems, and an object of the invention is to provide a method for manufacturing a liquid crystal display device and a device for manufacturing a liquid crystal display device, which are obtained by attaching a polarizing plate to both sides of a liquid crystal cell to produce a liquid crystal. When the optical inspection of the liquid crystal display panel is performed after the display panel is performed, the change of the alignment state of the liquid crystal during the attachment of the polarizing plate is suppressed, and there is no adverse effect due to the change of the alignment state of the liquid crystal, and the inspection of the subsequent stage can be performed. By step, the erroneous detection in the panel inspection will not be incurred, and the time required can be shortened.

The inventors of the present invention have judged that the alignment state of the liquid crystal during the inspection is not uniform due to the charging of the liquid crystal cells in the attaching step (layering step) of the polarizing plate. Further, in further research, it was found that the order in which the polarizing plates are bonded to the substrate can be suppressed in a specific order, whereby the charging of the liquid crystal cells can be suppressed, and therefore, even if the time interval (pitch) between the lamination step and the inspection step is shortened, There is no adverse effect caused by the change of the alignment state of the liquid crystal, and the inspection step of the latter stage can be carried out. As a result, the erroneous detection of the panel inspection is not caused, and the required time can be shortened, so that the present invention can be completed.

That is, the present invention is a method of manufacturing a liquid crystal display device, comprising: a laminating step of a polarizing plate having the same or different layers of liquid crystal cells having a liquid crystal layer between the first substrate and the second substrate; The liquid crystal display panel is formed; and the inspection step is an optical inspection of the liquid crystal display panel, and the method of manufacturing the liquid crystal display device is characterized in that the step of laminating has the following steps: a first polarizing plate attaching step, Attaching the first polarizing plate to the first substrate that is difficult to be electrically attenuated after charging the second substrate; and the second polarizing plate attaching step, after the first polarizing plate attaching step, The second polarizing plate is attached to the second substrate which is easily attenuated by potential after being charged with the first substrate.

Preferably, in the method of manufacturing a liquid crystal display device, the first polarizing plate attaching step is: supplying a plurality of first polarizing plates cut at predetermined intervals in a peelable state and continuously forming along the long direction. a first strip on the first strip-shaped carrier film, and the first strip-shaped carrier film is folded back using a blade, and the first polarizer is sequentially stripped from the first strip-shaped carrier film, and the first polarized light is peeled off a step of attaching the board to the first substrate of the liquid crystal cell sequentially supplied; or supplying the long first polarizing plate longer than the liquid crystal cell in a peelable state on the first strip carrier film a strip-shaped body, and the first strip-shaped carrier film is folded back by using a blade to partially peel off the long first polarizing plate from the first strip-shaped carrier film, and the part of the elongated first polarizing plate is attached a step of attaching the first polarizing plate attaching step to the first substrate of the liquid crystal cell sequentially supplied, and then cutting the portion of the elongated first polarizing plate to be attached to the length corresponding to the liquid crystal cell Department: supply plurals cut at predetermined intervals The second polarizing plate is in a peelable state and is formed on the second strip-shaped carrier film continuously along the long direction, and the second strip-shaped carrier film is folded back by the blade to be followed by the second strip-shaped carrier film. Stripping the second polarizing plate, and attaching the peeled second polarizing plate to the second substrate of the liquid crystal cell to which the first polarizing plate is attached; or the supply is longer than the liquid crystal cell The long second polarizing plate is in a peelable state and formed on the second strip-shaped carrier film, and is used After the blade folds back the second strip-shaped carrier film, the long second polarizing plate is partially peeled off from the second strip-shaped carrier film, and the part of the stripped long second polarizing plate is attached to the sequential supply. a second substrate having liquid crystal cells of the first polarizing plate, and then cutting the portion of the elongated second polarizing plate that has been attached to the length corresponding to the length of the liquid crystal cell, wherein the checking step is After the two polarizing plate attaching steps, the steps of the transported liquid crystal display panel are optically checked in order.

In a preferred embodiment of the present invention, in the method of manufacturing a liquid crystal display device, the first polarizing plate attaching step is performed by overlapping at least one of the first polarizing plate and the liquid crystal cell. a state between the first pressing member pressed by the first polarizing plate side and the second pressing member pressed by the liquid crystal cell side, and the first polarizing plate and the liquid crystal cell are first added The pressing member and the second pressing member are relatively moved to perform.

Further, in the method of manufacturing a liquid crystal display device of the present invention, the second polarizing plate attaching step is performed by the liquid crystal cell to which the first polarizing plate is attached and the second polarizing plate At least one of the portions is overlapped with each other, and is held by the third pressing member pressed by the second polarizing plate side and the fourth pressing member pressed by the side of the first polarizing plate attached to the liquid crystal cell. In the meantime, the liquid crystal cell in which the first polarizing plate is laminated and the second polarizing plate are relatively moved to the third pressing member and the fourth pressing member.

Further, in the method of manufacturing a liquid crystal display device, the first substrate includes a circuit portion including a plurality of gate wirings and a plurality of gate wirings disposed perpendicularly to the plurality of gate wirings via an insulating film Source wiring person; a plurality of switching elements are provided in the foregoing plurality of gate wirings and front a plurality of pixel electrodes connected to the plurality of switching elements, wherein the second substrate has a common electrode facing the plurality of pixel electrodes, and the liquid crystal layer An electric field is applied between the pixel electrode and the common electrode in a direction substantially perpendicular to the substrate faces of the first substrate and the second substrate to drive the device.

Further, the present invention is preferably a method of manufacturing a liquid crystal display device, wherein the first substrate does not have a conductive member (preferably, a conductive member having a surface resistance value of 1.0 × 10 ¹² Ω/□ or less) And the second substrate has a pixel electrode and a common electrode for driving the liquid crystal layer by applying an electric field in a direction substantially parallel to the surface of the substrate.

Further, the present invention is preferably a method of manufacturing a liquid crystal display device, wherein the first polarizing plate has a conductive layer having a surface resistance value of 1.0 × 10 ¹² Ω/□ or less.

Moreover, the present invention provides a manufacturing apparatus for a liquid crystal display device, comprising: a layer stacking mechanism for forming the front and back sides of a liquid crystal cell having a liquid crystal layer between a first substrate and a second substrate, and stacking the same or different layers a polarizing plate is formed as a liquid crystal display panel; and an inspection mechanism is an optical inspection panel, and the manufacturing apparatus of the liquid crystal display device is characterized in that the laminating mechanism has the following mechanism: a first polarizing plate attaching mechanism Attaching the first polarizing plate to the first substrate that is less likely to be potential attenuated after being charged than the second substrate; and the second polarizing plate attaching mechanism is disposed after the first polarizing plate attaching mechanism a segment for attaching the second polarizing plate to the second substrate that is easily attenuated by the potential after the first substrate is charged.

Further, in the apparatus for manufacturing a liquid crystal display device of the present invention, the first polarizing plate attaching mechanism preferably has a blade that is folded back by the strip-shaped body to remove the first carrier film. The first strip-shaped carrier film sequentially peels off the first polarizing plate, and the plurality of first polarizing plates cut by the strip-shaped system at predetermined intervals are continuously formed on the first strip-shaped carrier film along the long direction in a peelable state. And the attaching mechanism, which is to attach the first polarizing plate that has been stripped to the first substrate of the liquid crystal cell sequentially supplied; or has the following: the blade is made by the first strip After the strip-shaped carrier film is folded back, the elongated first polarizing plate is partially peeled off from the first strip-shaped carrier film, and the first strip-shaped system is longer than the liquid crystal cell, and the elongated first polarizing plate is peelable. a state of being formed on the first strip-shaped carrier film; the attaching mechanism is a part of attaching the stripped elongated first polarizing plate to the first substrate of the sequentially supplied liquid crystal cell; and the cutting mechanism , the portion of the elongated first polarizing plate corresponds to the length of the liquid crystal cell In the cutting, the second polarizing plate attaching mechanism has a cutting edge, and the second strip-shaped carrier film is folded back by the strip-shaped body, and the second polarizing plate is sequentially peeled off by the second strip-shaped carrier film, and the foregoing a plurality of second polarizing plates cut at a predetermined interval in a peelable state are continuously formed on the second strip-shaped carrier film in a long direction; and an attaching mechanism is attached to the second polarizing plate which is peeled off Attached to the second substrate of the liquid crystal cell to which the first polarizing plate is attached; or having a blade edge, after the second strip-shaped carrier film is folded back by the second strip, the second The strip-shaped carrier film partially peels off the second polarizing plate, and the second strip-shaped system is longer than the liquid crystal cell, and the second polarizing plate is formed in a peelable state on the second strip-shaped carrier film; Institution, a long polarized second polarizing plate a portion attached to the second substrate of the liquid crystal cell to which the first polarizing plate is attached; and a cutting mechanism for the length of the second polarizing plate to correspond to the length of the liquid crystal cell In the case of cutting, the inspection means optically sequentially inspects the mechanism of the liquid crystal display panel to be conveyed in the subsequent stage of the second polarizing plate attaching mechanism.

Further, in the apparatus for manufacturing a liquid crystal display device of the present invention, the first polarizing plate attaching mechanism has a state in which at least one of the first polarizing plate and the liquid crystal cell overlap each other. Holding the first pressing member on the first polarizing plate side and the second pressing member on the liquid crystal cell side, and configuring the first polarizing plate and the liquid crystal cell to be opposite to the first pressing member and the second pressing member Moving to attach the first polarizing plate to the first substrate.

Further, in the above-described manufacturing apparatus of the liquid crystal display device, the second polarizing plate attaching mechanism preferably has a liquid crystal cell to which the first polarizing plate is attached and the second polarizing plate a third pressing member on the second polarizing plate side held by at least one of the overlapping portions and a fourth pressing member attached to the first polarizing plate side of the liquid crystal cell, and configured to have a laminated layer The liquid crystal cell of the polarizing plate and the second polarizing plate relatively move the third pressing member and the fourth pressing member to attach the second polarizing plate to the second substrate.

According to the manufacturing method and the manufacturing apparatus of the liquid crystal display device of the present invention, when the polarizing plate is attached to both surfaces of the liquid crystal cell to form a liquid crystal display panel, the liquid crystal cell in the attaching step (layering step) of the polarizing plate is suppressed. yuan Since the charging is performed, even if the time interval (pitch) between the lamination step and the inspection step is shortened, there is no adverse effect caused by the charging of the liquid crystal cell, and the inspection step of the latter stage can be performed, and the result is that the panel inspection step is not incurred. The erroneous detection can greatly shorten the time required to manufacture a liquid crystal display device. In particular, in the manner in which the polarizing plate is continuously and automatically attached to the liquid crystal cell, the effect of maintaining the high-speed continuous manufacturability of the liquid crystal display panel can be remarkably excellent.

Simple illustration

Fig. 1 is a cross-sectional schematic view showing a liquid crystal display panel manufactured in the first embodiment.

Fig. 2 is a flow chart showing an embodiment of a method of manufacturing a liquid crystal display device of the first embodiment.

Fig. 3 is a schematic block diagram showing a manufacturing apparatus of a liquid crystal display device of the first embodiment.

Fig. 4 is a schematic enlarged view showing the first polarizing plate original plate preparing step S1 and the second cutting step S5 in the third drawing.

Fig. 5 is a schematic enlarged view showing the second polarizing plate original plate preparing step S4 and the second cutting step S5 in the third drawing.

Fig. 6 is an enlarged view showing the inspection step S7 in the aforementioned third drawing.

Fig. 7 is a schematic cross-sectional view showing the configuration of a film having a first polarizing plate between the first polarizing plate original plate preparing step S1 and the first polarizing plate attaching step S3a.

Fig. 8 is a view showing a configuration of a film having a first polarizing plate between the second polarizing plate original plate preparing step S4 and the second polarizing plate attaching step S3b. Face mode diagram.

Fig. 9 is a cross-sectional schematic view showing a liquid crystal display panel manufactured in the second embodiment.

Fig. 10 is a graph showing the results of measuring the easiness of charging of a CF substrate and a TFT substrate.

Detailed description of the preferred embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Implementation type 1)

Fig. 1 is a cross-sectional schematic view of a liquid crystal display panel Y which is continuously manufactured at a high speed in the embodiment 1. As shown in FIG. 1, the liquid crystal display panel Y of the present embodiment includes: a liquid crystal cell 4 configured to hold the liquid crystal layer 43 located at the center by a pair of substrates 41 and 42; and a layer of the liquid crystal cell 4 a first polarizing plate 10 on a substrate 42 side; and a second polarizing plate 20 laminated on the second substrate 42 side of the liquid crystal cell 4. The liquid crystal cell 4 in this embodiment is a vertical alignment type (hereinafter referred to as "VA method").

The back surface side of the liquid crystal cell 4, that is, the substrate 41 disposed on the backlight side (hereinafter also referred to as a back side substrate) is provided on a transparent substrate 411 such as glass or plastic, and has a plurality of gate wirings and is interposed therebetween. a line portion of a plurality of source lines in which a plurality of gate lines and an insulating film are disposed orthogonally; a thin film transistor (TFT) 412 provided as a complex switching element at an intersection of the plurality of gate lines and the plurality of source lines; An interlayer insulating film 413 on a switching element (thin film transistor); disposed on the interlayer insulating film 413 and interposed with each of the plurality of switching elements formed in the connection hole of the interlayer insulating film 413 a plurality of transparent electrodes (pixel electrodes) 414 connected to the member 412; and an alignment film 415 disposed on the transparent electrode (pixel electrode) 414.

The thin film transistor 412 has a gate electrode, a semiconductor layer opposed to the gate electrode via a gate insulating film, and a source electrode and a drain electrode which are individually connected to the semiconductor layer. The gate wiring is connected to the gate electrode, the source wiring is connected to the source electrode, and the pixel electrode 414 is connected to the drain electrode.

The gate wiring, the gate electrode, the source wiring, the source electrode, and the drain electrode are made of a metal film such as titanium, chromium, aluminum, or molybdenum, or the alloy film thereof, or the laminated film thereof by sputtering or the like. After the film formation, it is formed by a method of patterning by photolithography or the like.

The semiconductor layer is formed by forming a semiconductor material such as amorphous germanium or polycrystalline germanium by a plasma CVD (Chemical Vapor Deposition) method or the like, and performing patterning by photolithography or the like.

The pixel electrode 414 is formed by a method of forming a transparent conductive material such as indium oxide (ITO), lead indium oxide, tin oxide, or lead oxide by a sputtering method or the like, and then performing patterning by photolithography or the like.

The alignment film 415 is formed by coating a polyimide film, and performing a polishing treatment.

On the other hand, the substrate 42 disposed on the image display surface side of the liquid crystal cell 4 (hereinafter also referred to as a display surface side substrate) is attached to a transparent substrate 421 such as glass or plastic, and has a color filter. a protective film layer (not shown) provided on the color filter 422; a transparent electrode (common electrode) 424 disposed on the protective film layer and disposed opposite to the plurality of pixel electrodes 414; An alignment film 425 on the transparent electrode (common electrode) 424.

Preferably, the color filter 422 is formed of a black matrix having light for shielding the gap of the colored pattern, and a color layer corresponding to red, green, and blue of each pixel.

The black matrix film is generally made of metallic chromium and has a film thickness of 100 to 150 nm.

Further, in the colored layer, a resin material is colored with a dye or a pigment, and the film thickness is generally 1 to 3 μm. The pixel pattern arrangement of the colored layer is a triangular arrangement, a mosaic arrangement, or a stripe arrangement.

Further, the protective film layer is made of an acrylic resin or an epoxy resin, and the film thickness is usually 0.5 to 2 μm.

The method of manufacturing the color filter 422 is not particularly limited, and a color filter manufactured by various conventionally known methods can be employed. Examples of the method for producing the color filter include a dyeing method, a pigment dispersion method, a printing method, and a plating method.

The common electrode 424 is formed by a method of forming a transparent conductive material such as indium oxide (ITO), lead indium oxide, tin oxide, or lead oxide by a sputtering method, and then performing patterning by a photolithography method or the like.

The liquid crystal layer 43 constituting the liquid crystal cell 4 is composed of, for example, nematic liquid crystal molecules 431 having a negative dielectric anisotropy (Δε < 0). The liquid crystal layer 43 is driven between the pixel electrode 414 of the back side substrate 41 and the common electrode 424 of the display surface side substrate 42 in a direction substantially perpendicular to the substrate surface. That is, when the voltage is less than the threshold voltage, as shown in FIG. 1, the long axis of the liquid crystal molecules is aligned substantially perpendicularly to the substrate surface, and the incident linear polarization from the back side is not subjected to the birefringence effect when passing through the liquid crystal layer 43. No pass The second polarizer 21 of the second polarizing plate 20 on the display side is passed. On the other hand, when the voltage is equal to or higher than the threshold voltage, the long axis of the liquid crystal molecules 431 is inclined to the substrate surface only at a predetermined angle depending on the magnitude of the voltage, so that the incident linear polarized light from the back side passes through the liquid crystal layer 43. It is changed to an elliptically polarized light by the birefringence effect, and a part of the light passes through the second polarizer 21 of the second polarizing plate 20 on the display surface side.

In the liquid crystal cell 4 of the first embodiment, the substrate on the back side of the substrate is a substrate that is easily charged, that is, a substrate that is less likely to be attenuated after charging. Therefore, when the liquid crystal cell of the VA method of the first embodiment is used, in the present invention, the back side substrate 41 is attached to the first substrate of the polarizing plate, and the display surface substrate 42 becomes the first. Two substrates.

The form of the liquid crystal cell 4 of the present invention is not particularly limited, and the back side substrate has a pixel electrode, the display surface side substrate has a common electrode, and the pixel electrode is common to the pixel electrode, except for the VA method described above. An electric field is applied between the electrodes in a direction substantially perpendicular to the surface of the substrate, thereby displaying the same in the TV (Twisted Nematic) method, the STN method (Super-teisted Nematic) method, and the OCB (Optically Compensated Birefringence) method for driving the liquid crystal layer. Therefore, similarly to the VA method described above, the back side substrate is the first substrate, and the display surface side substrate is the second substrate.

The first polarizing plate 10 has at least a first polarizer 11 . In this embodiment, the first inner protective film 13 and the first outer protective film 14 laminated on the inner and outer surfaces of the first polarizer 11 are laminated thereon. First inner protective film a first conductive layer 12 on the inner side of the first polarizing layer 10, a first adhesive layer 15 on the first substrate 41 of the liquid crystal cell 4, and a first adhesive layer 16 interposed therebetween The first surface of the outer protective film 14 protects the film 17.

The first polarizer 11 can be a well-known person, for example, a polyvinyl alcohol film which adsorbs an iodine complex or a dichroic dye is preferably used.

The first inner protective film 13 and the first outer protective film 14 are not particularly limited, and for example, it is preferably composed of a cellulose triacetate resin, a polyester resin, a polycarbonate resin, a cyclic polyolefin resin, or a (meth)acrylic resin. The film.

The first conductive layer 12 preferably has a surface resistance value of 1.0 × 10 ¹² Ω / □ or less, and preferably 1.0 × 10 ¹¹ Ω / □ or less. By providing the first conductive layer thus constituted, the charging of the liquid crystal display panel in the laminating step can be more effectively prevented, and the effect of making the alignment state of the liquid crystal molecules 431 more difficult to change greatly is obtained.

Further, the method of measuring the surface resistance value is as shown in the following examples.

The material of the first conductive layer 12 is not particularly limited, and a metal oxide such as ITO (Indium Tin Oxide) containing indium oxide as a main component and tin oxide added thereto, or polyacetylene, polypyrrole, or polythiophene may be used. A conductive polymer such as polyparaphenylene or a halogen or a halide added to the conductive polymer or an ionic surfactant.

Further, the film formation method of the first conductive layer 12 is not particularly limited. For example, in the case of a metal oxide, a vapor phase deposition method such as a sputtering method, a vacuum deposition method, an ion plating method, or a plasma CVD method can be suitably used. As the conductive polymer, a conventionally known coating method such as rod coating, blade coating, spin coating, reverse coating, die coating, or spray coating may be employed.

Further, the film thickness of the first conductive layer 12 is preferably 100 to 300 nm.

On the other hand, the second polarizing plate 20 has at least a second polarizer. In the embodiment, the second inner protective film 23 and the second outer protective film 24 are laminated on the inner and outer surfaces of the second polarizer 21. a second adhesive layer 25 for attaching the second polarizing plate 20 to the second substrate 42 of the liquid crystal cell 4, and a second layer of the second outer protective film 24 laminated via the second weak adhesive layer 26 Surface protection film 27.

The second polarizing plate 20 may not have a conductive layer, but it is preferable to have a conductive layer (second conductive layer) from the viewpoint of more reliably suppressing charging of the liquid crystal cell 4. The conductive layer can be formed in the same configuration as the first conductive layer described above.

Fig. 2 is a flow chart showing an embodiment of a method of manufacturing a liquid crystal display device of the present invention. As shown in Fig. 2, the method for manufacturing a liquid crystal display device of the present embodiment has the following steps: a first polarizing plate original plate preparing step S1, which is prepared by laminating a long first release film on a long first polarizing plate ( a first polarizing plate film formed by the first strip-shaped carrier film and rolled out; the first cutting step S2 cutting the long first polarizing light at a predetermined interval without cutting the first release film a first polarizing plate attaching step S3a, the first polarizing film peeling off the first release film and being cut is sequentially attached to the liquid crystal cell; the second polarizing plate original plate preparing step S4 is prepared to be long a second release film (second strip carrier film) is laminated on the long second polarizing plate, and then rolled out of the second polarizing plate original plate; and the second cutting step S5 does not cut the second release film And cutting the long second polarizing plate at a predetermined interval; the second polarizing plate attaching step S3b, and the second polarizing plate peeling off the second release film and cutting the second polarizing plate is attached to the first attached Liquid crystal cell of polarizing plate (liquid crystal cell layered body); and inspection step S7, The liquid crystal display panel produced by the steps is optically inspected sequentially. That is, the laminating step S3 has the first polarizing plate attaching step S3b and the second polarizing plate attaching step S3b.

On the other hand, FIG. 3 to FIG. 6 are schematic configuration diagrams of a manufacturing apparatus for manufacturing a liquid crystal display device of the present embodiment shown in FIG. Hereinafter, a method of manufacturing a liquid crystal display device and a manufacturing apparatus of the present embodiment will be specifically described with reference to FIGS. 3 to 6 .

As shown in FIG. 3, the manufacturing apparatus of the liquid crystal display device of the present embodiment has the following mechanism: a first polarizing plate original plate preparing mechanism (first polarizing plate original plate preparing step S1), which is used to roll out the long shape first. a first polarizing plate original plate 61 formed by laminating a long first release film 51 (first strip-shaped carrier film) on a polarizing plate; the first cutting mechanism (first cutting step S2) does not cut the first polarizing film 51 The first release film 51 is cut at a predetermined interval to cut the elongated first polarizing plate; the first polarizing plate attaching mechanism (the first polarizing plate attaching step S3a) is for peeling off the first release film 51 and the first polarizing plate cut off is sequentially attached to the liquid crystal cell 4; a winding mechanism (not shown) is used to rotate the liquid crystal cell 4 to which the first polarizing plate is attached in a horizontal direction. a second polarizing plate original plate preparing mechanism (second polarizing plate original plate preparing step S4) for preparing a long second release film 52 (second strip-shaped carrier film) laminated on the elongated second polarizing plate And the second polarizing plate original plate 62 is formed and rolled out; the second cutting mechanism (second cutting step S5) does not cut the second release film 62 Cutting the long second polarizing plate at a predetermined interval; the second polarizing plate attaching mechanism (the second polarizing plate attaching step S3b) is for peeling off the second release film and cutting the second The polarizing plate is sequentially attached to the liquid crystal cell to which the first polarizing plate is attached (liquid crystal cell layer And the inspection mechanism (inspection step S7), the liquid crystal display panel Y produced by the steps is optically inspected sequentially. That is, in the present embodiment, the laminating mechanism has the first polarizing plate attaching mechanism and the second polarizing plate attaching mechanism.

Specifically, the first polarizing plate original plate preparing mechanism (the first polarizing plate original plate preparing S1) is as shown in FIG. 4, and the first polarizing plate 10 having a long shape is laminated (Fig. 4) The first polarizing plate original plate 61, which is formed in the middle lower surface side and the long first release film 51 (the upper side in FIG. 4), is prepared to be wound into a roll shape and sequentially wound up.

Next, the first cutting mechanism (first cutting step S2) is configured to prepare the cutting mechanism 130 as shown in Fig. 4, and the elongated first polarizing plate 10 is used at predetermined intervals using the cutting mechanism 130. Cut and become a leaf body. However, the first release film 51 is not cut (so-called half cut), and the first polarizing plate 10 is cut into blade bodies, and then connected by the long first release film 51, and can be transported as a roller. The first strip (the first strips cut at a predetermined interval are continuously formed in a peelable state to be formed on the first strip of the first strip-shaped carrier film). Further, the interval of the cutting is due to the size of the liquid crystal cell (first substrate 41) to be bonded.

Next, the first polarizing plate attaching mechanism (first polarizing plate attaching step S3a) has a first pressing member and a second pressing member disposed opposite each other as shown in FIG. 4, and the first first The polarizing plate 10 is simultaneously fed between the pressing members and the liquid crystal cells 4 which are separately prepared (supplied), and sequentially attached (automatically attached) to the surface of the liquid crystal cell 4 to form a liquid crystal cell laminated body. Here, the first pressurizing member in the present embodiment is biased upward by the potential energy in the fourth pass. The attaching roller 150a of the first polarizing plate 10 is pressed, and the second pressing member abuts against the lower surface of the liquid crystal cell 4 to hold the first polarizing plate 10 and the liquid crystal with the first pressing member (the attaching roller 150a). The cell 4 is transported to the support roller 150b on the downstream side. Moreover, the first polarizing plate attaching mechanism (first polarizing plate attaching step S3a) has a blade 140, and the first release film 51 is used by the blade 140 before the attaching roller 150a and the supporting roller 150b. The polarizing plate 10 is peeled off, and the first polarizing plate 10 is attached to the liquid crystal cell 4 via the exposed first adhesive layer 15.

Moreover, the first polarizing plate 10 is attached to the first polarizing plate attaching step S3a, and the back side substrate (first substrate) 41 which is hard to be electrically attenuated after being charged is used.

On the other hand, as shown in FIG. 5, the second polarizing plate original plate preparing means (second polarizing plate original plate preparing step S4) is configured such that the long second polarizing plate 20 (the upper side in the fifth middle direction) and the long shape are formed. The second polarizing plate original plate 62, which is formed by laminating the two release films 52 (lower side in FIG. 5), is prepared in a state of being wound into a roll, and is sequentially wound up.

Next, the second cutting mechanism (second cutting step S5) is configured to have the cutting mechanism 230 as shown in Fig. 5, and the cutting mechanism 230 is used to cut the long second polarizing plate at predetermined intervals. 20, made into a leaf body. However, the second release film 52 is not cut (so-called half cut), and the second polarizing plate 20 is cut into a blade body, and is also connected by the long second release film 52 to be formed. The second strip-shaped body that can be conveyed by the roller (the plurality of second polarizing plates cut at predetermined intervals are continuously formed into a second strip-shaped body of the second strip-shaped carrier film in a peelable state). Further, the interval of the cutting is due to the size of the liquid crystal cell (second substrate 42) to be bonded.

Next, the second polarizing plate attaching mechanism (the second polarizing plate attaching step S3b) has the third pressing member and the fourth pressing member disposed opposite each other as shown in FIG. 5, and the second pressing member The polarizing plate 20 is simultaneously fed between the pressing members and the liquid crystal cell laminated body X produced through the first polarizing plate attaching step S3a, and the second polarizing plate 20 is sequentially attached (automatically attached). A liquid crystal display panel Y is formed on the surface of the liquid crystal cell laminate X. Here, the third pressing member in the present embodiment is a bonding roller 250a which is biased downward in the fifth drawing and is pressed against the second polarizing plate 20, and the fourth pressing member is laminated with the liquid crystal cell. The lower side of the body X is in contact with the third pressing member (attach roller 250a) to hold the second polarizing plate 10 and the liquid crystal cell laminated body X, and the supporting roller 250b is transported to the downstream side. Moreover, the second polarizing plate attaching mechanism (second polarizing plate attaching step S3b) has a blade 240, and the second release film 52 is used by the blade 240 before the attaching roller 250a and the supporting roller 250b. The two polarizing plates 20 are peeled off, whereby the second polarizing plate 20 is attached to the liquid crystal cell laminated body X via the exposed second adhesive layer 25. Further, in the second polarizing plate attaching step S3b, the second polarizing plate 20 is attached to the display surface side substrate (second substrate) 42 which is easily attenuated after charging.

The inspection mechanism (inspection mechanism S7) is a liquid crystal display for sequentially (automatically checking) the second stage of the second polarizing plate attaching mechanism (after the second polarizing plate attaching step S3b) as shown in FIG. The panel Y is specifically configured such that the light is vertically irradiated onto the lower surface of the liquid crystal display panel Y by the light source 310, and the transmitted light is captured by the CCD camera 330 to obtain image data, and the obtained image data is subjected to image analysis processing to determine Whether there are defects, and then judge the good or bad.

In order to shorten the required time, the inspection mechanism is disposed after the second polarizing plate attaching mechanism, that is, the interval between the inspection step S7 and the attaching step S3b is relatively short. Specifically, after the liquid crystal display panel Y is disposed through the second polarizing plate attaching step S3b, it is preferable to perform the inspection within 1 minute, preferably within 40 seconds, preferably within 20 seconds, especially within 10 seconds. optimal.

Figure 7 is a first step from the first polarizing plate original plate preparing step S1 to the first polarizing plate attaching step S3b between the first polarizing plate original plate preparing step S4 and the second polarizing plate attaching step S3b A cross-sectional schematic view of the structure of the film of the polarizing plate.

As shown in Fig. 7, in the first polarizing plate original plate preparing step S1, the first polarizing plate original plate 61 in which the long first polarizing plate 10 and the long first release film 51 are laminated is formed.

In the first cutting step S2, the cutting means 130 forms a cut mark on the first polarizing plate 10 at a predetermined interval, but the first release film is not cut and remains long (making the first strip-shaped body) ).

Next, in the first polarizing plate attaching step S3a, the first release film 51 is peeled off by the first polarizing plate 10, and only the first polarizing plate 10 is sequentially laminated on the liquid crystal cell 4 via the first adhesive layer 15. The first substrate 41 continuously manufactures the liquid crystal cell laminated body X.

On the other hand, as shown in Fig. 8, in the second polarizing plate original plate preparation step S4, the second polarizing plate original plate 62 in which the long second polarizing plate 20 and the long second release film 52 are laminated is formed.

Further, in the second cutting step S5, a cut mark is formed on the second polarizing plate 20 at a predetermined interval by the cutting mechanism 230, but the second release film 52 is formed. It is not cut and kept long (making a second strip).

Next, in the second polarizing plate attaching step S3b, the second release film 52 is peeled off by the second polarizing plate 20, and only the second polarizing plate 20 is sequentially laminated on the liquid crystal cell 4 via the second adhesive layer 25. The second substrate 42 continuously manufactures the liquid crystal display panel Y.

According to the manufacturing apparatus and the manufacturing method of the liquid crystal display device of the present embodiment, the first polarizing plate having the conductive layer is attached to the first substrate (back side substrate) which is difficult to be electrically attenuated after charging, and then the first polarizing plate having the conductive layer is attached The second polarizing plate (display surface side substrate) which is easily attenuated after charging is attached to the second polarizing plate, whereby the charging of the liquid crystal cell is suppressed, and the optical inspection step is performed even after the attaching step (layering step) It is also not affected by the electrification of the liquid crystal cell, and the inspection can be performed. Therefore, there is no erroneous detection and the required time can be shortened. As a result, the VA liquid crystal display panel can be continuously manufactured at a high speed, and the production efficiency can be greatly improved.

In the liquid crystal cell of the VA method of the present embodiment, the back side substrate (first substrate) is formed between the circuit portion such as the gate wiring and the pixel electrode. There is a switching element (thin film transistor), whereby it is difficult to attenuate the potential when temporarily charged, and when the liquid crystal cell is charged by friction with the supporting roller, the state of electrification continues.

Specifically, the charge stored on the surface of the substrate due to static induction upon charging will then move to the pixel electrode or the circuit portion, and both become in a state in which the charge is stored, but in the subsequent discharge, although the charge is quickly self-circuited from the circuit When the pixel electrode is in the non-driving state, the switching element (thin film transistor) is electrically disconnected from the circuit portion, so the charge is directed to the circuit portion side. In the state in which it is easy to be in a state of being stored, it is considered that the back side substrate in the above embodiment becomes difficult to be electrically attenuated after being charged.

According to the apparatus and method of the present embodiment, it is presumed that the polarizing plate is attached to the back side substrate (first substrate) in comparison with the display surface side substrate (second substrate), thereby preventing the first substrate and the like. The friction between the rollers is attached to suppress the charging of the liquid crystal cells.

Further, in the present embodiment, it is a matter of course that conventionally known technical matters can be suitably employed within the scope of not obscuring the effects of the invention.

For example, in the present embodiment, the case where the first conductive layer is provided between the first adhesive layer and the first inner protective film will be described. However, in the present invention, the position at which the first conductive layer is formed is not particularly limited. It is disposed at any position of the first polarizing plate, that is, from the first surface protective film to any position of the first adhesive layer.

Further, the first polarizing plate or the second polarizing plate may have any layer having other optical functions or physical functions, for example, a brightness improving layer, a retardation layer, an antireflection layer, or the like, in addition to the above layer.

Further, in the above-described embodiment, the long first release film and the long second release film are used, and the half-cut is used in the cutting step, and the polarizing plate as the blade body is connected by the release film. After the cutting step, it can be transported as a long body before being attached, but the present invention is not limited to this aspect.

For example, a strip-shaped body formed on a strip-shaped carrier film in a state in which a long polarizing plate longer than a liquid crystal cell is peeled off may be formed, and the strip-shaped carrier film may be folded back using a blade to form a strip-shaped carrier film. Partially stripped long polarized light The plate is attached to a substrate of the liquid crystal cell sequentially supplied to the substrate, and then the portion to which the long polarizing plate has been attached is cut to correspond to the length of the liquid crystal cell. The automatic attachment method is not particularly limited, and the method disclosed in Japanese Laid-Open Patent Publication No. 200537418 or the like can be employed. In the automatic attaching method, after the step (layering step) of manufacturing the liquid crystal display panel (after the lamination mechanism), when the inspection step (inspection mechanism) of the crystal display panel is provided, the technical idea of the present invention is applied. The effect of the present invention, which can shorten the required time without causing erroneous detection of the panel inspection, can be effectively utilized, and the high-speed continuous manufacturability of the liquid crystal display panel can be ensured.

Moreover, in the above-described embodiment, the pressing member is a bonding roller and a supporting roller, and the present invention is not limited thereto, and a plate-like body having elasticity or the like may be used as the pressing member.

Furthermore, in the manufacturing method of the above-described embodiment, the liquid crystal cell of the VA type is used as the liquid crystal cell to which the polarizing plate is attached. However, as described above, the present invention is not limited to this embodiment. Other methods of liquid crystal cells can also be applied.

Hereinafter, Embodiment 2 of the present invention in which a liquid crystal cell of an in-plane switching (IPS; In-Plane Switching) method is used will be specifically described.

(Embodiment 2)

Fig. 9 is a cross-sectional schematic view showing a liquid crystal display panel of an IPS type liquid crystal cell which is manufactured by high speed and continuously manufactured in the second embodiment. In the ninth embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in Fig. 9, the liquid crystal cell 4' of the IPS method used in the second embodiment is configured to sandwich the liquid crystal layer 43' between the pair of substrates 41' and 42' in the same manner as the other liquid crystal cells. Further, among the pair of substrates, the display surface side substrate 42' on the display surface side of the liquid crystal cell 4' does not have a conductive member such as a pixel electrode or a common electrode, and on the other hand, is located in the liquid crystal cell 4'. The back side substrate 41' on the back side has a configuration for driving the pixel electrode and the common electrode of the liquid crystal layer 43', and an electric field is applied between the pixel electrode and the common electrode, that is, in a direction substantially parallel to the surface of the substrate. The liquid crystal layer 43' is driven.

Specifically, the back side substrate 41 ′ is provided on a transparent substrate 411 such as glass or plastic, and has a circuit portion including a plurality of gate wirings and a plurality of common electrode wirings, and the plurality of gate wirings and the plurality of common electrodes a plurality of source wirings arranged orthogonally with an insulating film; a thin film transistor (TFT) 412 as a plurality of switching elements is provided at an intersection of the plurality of gate wirings and the plurality of source wirings; and a protective film 413 a plurality of switching elements (thin film transistors) 412 are provided in the plurality of switching elements (thin film transistors); the plurality of transparent electrodes (pixel electrodes) are provided on the protective film 413, and are connected to the plurality of through holes formed through the protective film. Each of the plurality of common electrode 416 is provided in the protective film 413, and is connected to each of the plurality of common electrode wirings via a through hole formed through the gate insulating film and the protective film; and the alignment film 415 The system is disposed on a plurality of transparent electrodes (pixel electrodes) 414 and a plurality of common electrodes 416.

The thin film transistor 412 has a gate electrode, a semiconductor layer that faces the gate electrode via a gate insulating film, and a source electrode and a drain electrode that are individually connected to the semiconductor layer.

On the other hand, the display surface side substrate 42' has a color filter 422, a protective film layer (not shown) provided on the color filter 422, and a transparent substrate 421 such as glass or plastic; An alignment film 425 on the coating layer.

The liquid crystal layer 43' constituting the liquid crystal cell 4' is generally composed of a nematic liquid crystal molecule 431' having a positive dielectric anisotropy (?? > 0). The liquid crystal layer 43' is driven between the pixel electrode 414 and the common electrode 416 in the back side substrate 41' by an electric field in a direction substantially parallel to the substrate surface. That is, if the voltage is less than the threshold voltage, since the long axis of the liquid crystal molecules 431' is parallel to the substrate surface and is parallel or orthogonal to the absorption axis of the first polarizer 11 of the first optical sheet 10, the incident linear polarization from the backlight side is The liquid crystal layer 43' is not subjected to the birefringence effect. On the other hand, when the voltage is above the threshold voltage, the long axis of most of the liquid crystal molecules 431' except for the vicinity of the substrate surface may be in a plane parallel to the substrate surface at a predetermined angle depending on the magnitude of the voltage. Rotation in the direction (inclination of the absorption axis of the first polarizer 11 of the first polarizing plate 10), so that the incident linear polarized light receives the birefringence effect and changes into elliptically polarized light. As a result, light which is quantified in response to one of the rotating legs of the liquid crystal molecules passes through the polarizer 11 of the first polarizing plate 10.

As described above, in the embodiment 2 of the liquid crystal cell using the IPS method, it is difficult to compare the display surface side 42' with the back surface side substrate 41' because it does not have a conductive member such as a pixel electrode or a common electrode. The potential decay after charging occurs. Therefore, in the second embodiment, the display surface side substrate 42' is the first substrate to which the polarizing plate should be attached first, and the back side substrate 41' is the second substrate.

As a result, the manufacturing method of the liquid crystal display device of the embodiment 2 and In the manufacturing apparatus, the display-side substrate is the first substrate, the polarizing plate on the display surface side is the first polarizing plate, the back-side substrate is the second substrate, and the polarizing plate on the back side is the second polarizing plate, but other configurations are the same as those described above. Since the manufacturing method and manufacturing apparatus of the type 1 are the same, description is abbreviate|omitted.

According to the method of manufacturing a liquid crystal display device of the second embodiment, the display surface side substrate 42' is a first substrate, and the first polarizing plate is attached to the first substrate, and then the back side is bonded. The substrate 41' is a second substrate, and the second polarizing plate is disposed on the second substrate, whereby the charging of the liquid crystal cell 4' is suppressed, and therefore, even if the optical inspection step of the liquid crystal display panel is performed after the attaching step, It is also not affected by the electrification of the liquid crystal cell, and inspection can be performed. As a result, no false detection can be performed, and the time required can be shortened. Therefore, the IPS liquid crystal display panel can be continuously manufactured at a high speed, and the production efficiency can be greatly improved.

The reason why the charging of the liquid crystal cell is suppressed is not determined. However, in the present embodiment 2 in which the liquid crystal cell of the IPS method is used, the display side substrate does not have a conductive member such as a pixel electrode or a common electrode, and thus is temporarily charged. It is difficult to attenuate the potential, and when the liquid crystal cell is charged due to friction with the attached roller, the charged state can be maintained.

Furthermore, in the IPS method, in addition to the erroneous detection of the inspection step, electrostatic breakdown of the switching element (thin film transistor) also becomes a problem. The destruction mechanism of the switching element in the liquid crystal cell of the IPO mode is considered to be excessive current flowing through the switching element when the electric charge stored on the display surface side substrate (first substrate) is discharged toward the back side substrate (second substrate). This destroys the switching element. According to the apparatus and method of this embodiment, it is speculated that the electrostatic breakdown of such a switching element will also suppressed.

Further, in the present invention, other mechanisms (steps) may be appropriately present between the respective steps (for example, the laminating mechanism (layering step)) and the inspection mechanism (inspection step) within a range that does not impair the effects of the present invention. ).

Example

Next, the present invention will be described in more detail by way of examples, but the invention is not limited thereto.

(Measurement of the easiness of charging of a liquid crystal cell substrate)

The CF substrate (substrate having a color filter) constituting the VA mode liquid crystal cell and the TFT substrate (substrate having a thin film transistor) were measured for easiness of charging. Specifically, after the both ends of the substrate were placed and fixed on a support table made of PTFE (polytetrafluoroethylene), a disk made of a disk made of PTFE and a disk made of SUS304 was wiped with a cloth (thickness: 0.8 mm, ψ 250mm) SUS304 is placed on the disc side several times and then charged, and the SUS304 disc is attached to the fixed substrate, and then the substrate is separated. Next, between the series of operations, the charge amount of the substrate was measured from the back side of the bonding surface of the substrate using a charge amount measuring device (manufactured by SMC, IZH10). The results are shown in Tables 1 and 10 below.

As shown in the first table and the tenth diagram, it is understood that the TFT substrate is temporarily charged in a state in which the disk made of PTFE is separated. In contrast, CF is known. The substrate is returned to the initial state after the PTFE disc is separated. That is to say, in the VA liquid crystal cell used in this test, it is known that the TFT substrate is easily charged, that is, it is difficult to charge the first substrate and the CF substrate which are hard to be electrically attenuated after charging, that is, it is easy to be charged. A second substrate whose potential is attenuated. Hereinafter, in the present examples and comparative examples, the TFT substrate was used as the first substrate, and the CF substrate was used as the second substrate.

<Example 1>

By using the apparatus described in the first embodiment, the first polarizing plate attaching step (S3a) of attaching the first polarizing plate to the rectangular liquid crystal cell by the long side is performed, and then the liquid crystal cell is rotated in the horizontal direction ( After the rotation is performed at 90 degrees, the alignment (alignment) is performed, and then the second polarizing plate attaching step (S3b) of attaching the second polarizing plate to the liquid crystal cell by the short side is performed, and the liquid crystal display panel of 2000 sheets is continuously manufactured. . The attachment speed of each polarizing plate and the transport speed of the liquid crystal cell were 200 mm/s. Further, the materials used and the specifications of the machine are as follows.

Further, the surface resistance value of the conductive layer contained in one portion of the original plate of the polarizing plate is determined in accordance with JIS K 6911 5.13. Specifically, the polarizing plate was cut into a size of 150 mm × 150 mm as a test piece, and Mitsubishi Chemical was used. High resistance/low power meter made by the company The surface resistance value of the test piece was measured by UP (trade name) (model: MCP-HT450) and probe (model: MCP-SWB01).

Moreover, the sticking speed was used as a measurement value of the speed of the polarizing plate and the liquid crystal cell by the following attachment roller and a support roller. That is, the attachment speed of the polarizing plate is the same as the transport speed of the liquid crystal cell.

(using materials and using machines)

‧ LCD cell: vertical alignment type (screen size 32 inches).

‧ First polarizing plate original plate and second polarizing plate original plate: manufactured by Nitto Denko Corporation, trade name "VEG1724DU-AC" (including conductive layer: surface resistance value 1.0 × 10 ¹¹ Ω / □, film thickness 150 μm)

‧ Attached roller (attach side): manufactured by Jiagui Roller Co., Ltd., model "LM4070E", made of conductive crystal, hardness 70°, surface resistance value 1.0×10 ⁶ Ω/□, roller diameter 100mm

‧Support roller (support side): manufactured by Jiagui Roller Co., Ltd., model "Black EC-N970", made of conductive urethane, hardness 70°, surface resistance value 1.0×10 ⁸ Ω/□, roller diameter 200mm

<Examples 2 to 4>

A liquid crystal display panel of 2,000 sheets was produced in the same manner as in Example 1 except that the attachment speed of the polarizing plate and the transport speed of the liquid crystal cell were 150 mm/s, 100 mm/s, and 50 mm/s, respectively.

<Comparative Example 1>

The order of attachment is the reverse of that of the first embodiment, that is, after the second polarizing plate attaching step (S3b) is performed, the first polarizing plate attaching step (S3a) is performed, and otherwise the same as in the first embodiment, the making is performed 2000. The liquid crystal display panel.

<Comparative Examples 2 to 4>

A liquid crystal display panel of 2,000 sheets was produced in the same manner as in Example 1 except that the attachment speed of the polarizing plate and the transport speed of the liquid crystal cell were 150 mm/s, 100 mm/s, and 50 mm/s, respectively.

<Comparative Example 5>

Measurement result based on the amount of charge of the liquid crystal cell substrate (1st, 10th) In the same manner as in Comparative Example 1, except that the time interval (pitch) between the second polarizing plate attaching step (S3b) and the first polarizing plate attaching step (S3a) was 600 seconds. 2000 LCD panels.

(Measurement of the amount of electricity)

In the examples and comparative examples, the charge amount measuring device is set after each attaching step ( The company manufactures, model SK-200), measures the charged amount of the attached battery, and calculates the average value for the 2000 liquid crystal display panels. The results are shown in Table 3 below.

(evaluation of inspection steps)

Further, in the liquid crystal display panel produced in the examples and the comparative examples, the inspection step was carried out by an optical inspection apparatus disposed on the downstream side of the attaching step of the subsequent stage. In the inspection step, light is irradiated from the lower surface side of the liquid crystal display panel, and the CCD camera disposed on the upper surface side detects the transmission state of the light that should be isolated, and performs image analysis processing based on the detection result.

Hereinafter, each of the attaching step and the inspecting step in the above-described examples and comparative examples, that is, the required time required between the steps, is shown in the second table below.

In the above-mentioned inspection step, it is considered that the misalignment of the liquid crystal molecules is not the cause of the erroneous detection, and even if one piece is present, the display is x, and the case where the erroneous detection does not occur is ○, and the result is as shown in the third table below.

As a result of the third table, it is considered that in the comparative examples 1 to 4 in which the CF substrate (second substrate) which is easily attenuated after charging is subjected to the attaching step S3b, erroneous detection occurs in the detecting step, but the charging is performed. TFT with low potential potential attenuation In the first to fourth embodiments in which the substrate (first substrate) was subjected to the attaching step S3a, erroneous detection did not occur in the inspection step.

Further, in Comparative Example 5, even if the CF substrate (second substrate) which is easily attenuated after charging is subjected to the attaching step S3b, the inspection step can be performed at intervals of 600 seconds to confirm the error prevention. However, at this time, in Examples 1 to 4, compared with Comparative Examples 1 to 4, the required time was extremely long, and the production efficiency was drastically lowered.

(Comparative examples 6 to 10)

Next, in the attaching step of the front and rear stages, the contact area between the substrate and the supporting roller can be changed by changing the gap (void) between the attaching roller (polarizing plate side) and the supporting roller (substrate side). The same lines of sight as in Example 1 and Comparative Example 1 were carried out. The test conditions and test results are as described in Table 4 below.

As a result of the fourth table, even when the attaching step S3b is performed on the CF substrate (second substrate) which is easily attenuated after charging, the contact area between the substrate and the roller can be reduced to suppress the liquid crystal cell. Charged (Comparative Example 9, 10) In this case, it is judged that the contact pressure between the substrate and the roller is lowered and the bubble has entered. On the contrary, by increasing the contact area between the substrate and the roller, increasing the contact pressure between the substrate and the roller, and suppressing the entry of the bubble (Comparative Examples 1, 6 to 8), it is determined that the liquid crystal cell is easily charged, and the inspection step has been generated. False detection.

On the other hand, in the first embodiment, it is judged that the contact area between the substrate and the roller is increased, the contact pressure between the substrate and the roller is increased, and the entry of the bubble is suppressed, and at the same time, the charging of the liquid crystal cell is suppressed, and the erroneous detection at the inspection step can be prevented. .

1‧‧‧Method of manufacturing liquid crystal display device

4,4’‧‧‧ LCD cells

10‧‧‧First polarizer

11‧‧‧First polarizer

12‧‧‧ Conductive layer

13‧‧‧First inner protective film

14‧‧‧First outer protective film

15‧‧‧First adhesive layer

16‧‧‧First weak adhesive layer

17‧‧‧First surface protection film

20‧‧‧Second polarizer

21‧‧‧Second polarizer

23‧‧‧Second inner protective film

24‧‧‧Second outer protective film

25‧‧‧Second Adhesive Layer

26‧‧‧Second weak adhesion layer

27‧‧‧Second surface protective film

41,41'‧‧‧ Back side substrate

42,42'‧‧‧ display side substrate

43,43'‧‧‧Liquid layer

51‧‧‧First release film

52‧‧‧Second release film

61‧‧‧ first polarizing plate original plate

62‧‧‧Second polarizing plate original plate

130‧‧‧cutting mechanism

140‧‧‧blade

150a‧‧‧ attached roller

150b‧‧‧Support roller

230‧‧‧ cutting mechanism with steps

240‧‧‧blade

250a‧‧‧ attached roller

250b‧‧‧Support roller

310‧‧‧Light source

330‧‧‧CCD camera

411,421‧‧‧ glass substrate

412‧‧‧TFT

413‧‧‧Interlayer insulating film

414,424‧‧‧Transparent electrode (pixel electrode)

415,425‧‧‧ alignment film

416‧‧‧Common electrode

422‧‧‧ color filter

431,431'‧‧‧ liquid crystal molecules

S1‧‧‧First polarizer original board preparation steps

S2‧‧‧First cutting step

S3‧‧‧ layering steps

S3a‧‧‧First Polarizer Sticking Steps

S3b‧‧‧Second polarizer attachment step

S4‧‧‧Second polarizer original board preparation

S5‧‧‧Second cutting step

S7‧‧‧Checking steps

X‧‧‧ liquid crystal cell layer

Y‧‧‧LCD panel

Fig. 1 is a cross-sectional schematic view showing a liquid crystal display panel manufactured in the first embodiment.

Fig. 2 is a flow chart showing an embodiment of a method of manufacturing a liquid crystal display device of the first embodiment.

Fig. 3 is a schematic block diagram showing a manufacturing apparatus of a liquid crystal display device of the first embodiment.

Fig. 4 is a schematic enlarged view showing the first polarizing plate original plate preparing step S1 and the second cutting step S5 in the third drawing.

Fig. 5 is a schematic enlarged view showing the second polarizing plate original plate preparing step S4 and the second cutting step S5 in the third drawing.

Fig. 6 is an enlarged view showing the inspection step S7 in the aforementioned third drawing.

Fig. 7 is a schematic cross-sectional view showing the configuration of a film having a first polarizing plate between the first polarizing plate original plate preparing step S1 and the first polarizing plate attaching step S3a.

Fig. 8 is a schematic cross-sectional view showing the configuration of a film having a first polarizing plate between the second polarizing plate original plate preparing step S4 and the second polarizing plate attaching step S3b.

Fig. 9 is a cross-sectional schematic view showing a liquid crystal display panel manufactured in the second embodiment.

Fig. 10 is a graph showing the results of measuring the easiness of charging of a CF substrate and a TFT substrate.

4‧‧‧LCD cells

41‧‧‧First substrate

42‧‧‧second substrate

51‧‧‧First release film

52‧‧‧Second release film

61‧‧‧ first polarizing plate original plate

62‧‧‧Second polarizing plate original plate

130‧‧‧cutting mechanism

140‧‧‧blade

150a‧‧‧ attached roller

150b‧‧‧Support roller

230‧‧‧ cutting mechanism with steps

240‧‧‧blade

250a‧‧‧ attached roller

250b‧‧‧Support roller

310‧‧‧Light source

330‧‧‧CCD camera

S1‧‧‧First polarizer original board preparation steps

S2‧‧‧First cutting step

S3‧‧‧ layering steps

S3a‧‧‧First Polarizer Sticking Steps

S3b‧‧‧Second polarizer attachment step

S4‧‧‧Second polarizer original board preparation

S5‧‧‧Second cutting step

S7‧‧‧Checking steps

X‧‧‧ liquid crystal cell layer

Y‧‧‧LCD panel

Claims (14)

A method for laminating a polarizing plate is a polarizing plate having the same or different laminated layers of a liquid crystal cell having a liquid crystal layer between a first substrate and a second substrate, and the liquid crystal cell is the liquid crystal display panel. The first substrate is less likely to be electrically attenuated after being charged than the second substrate, and the method of laminating the polarizing plate includes a first polarizing plate attaching step, which is wound into a reel shape and is elongated a first polarizing plate formed by laminating a first release film of a polarizing plate is pulled out by a reel, and the first long film is cut without cutting the long first release film to cut the first shape of the long shape at a predetermined interval a polarizing plate, sequentially forming a first cutting polarizing plate, and superposing each of the first cutting polarizing plates sequentially formed on the first substrate of the liquid crystal cells sequentially supplied, so as to overlap the first Cutting the polarizing plate and the liquid crystal cell between the first pressing member and the second pressing member, and passing between the first pressing member and the second pressing member, thereby disposing the first cutting polarized light The board is attached to the liquid crystal cell in sequence; and The second polarizing plate attaching step is a second polarizing plate formed by winding a second release film having a long shape in a roll shape and a long second polarizing plate after the first polarizing plate attaching step. The original plate is pulled out by the reel, and the long second polarizing film is cut at a predetermined interval without cutting the long second release film, and the second cutting polarizing plate is sequentially formed, and sequentially formed. The second cut polarizer Each of the second substrate on which the liquid crystal cell of the first cutting polarizing plate is attached is attached, and the second cutting polarizing plate and the liquid crystal cell that are overlapped are held by the third pressing member and the fourth adding Between the pressing members, and between the third pressing member and the fourth pressing member, the second cutting polarizing plate is sequentially attached to the liquid crystal cells. The method of laminating a polarizing plate according to claim 1, wherein the first polarizing plate attaching step folds the release film, and sequentially peels off the first cut polarizing plate from the release film, and The first cutting polarizing plate is sequentially attached to the first substrate of the liquid crystal cell sequentially supplied, and the second polarizing plate attaching step is to fold the release film from the release film. The second cutting polarizing plate is sequentially peeled off, and the second cutting polarizing plate is sequentially attached to the second substrate of the liquid crystal cell to which the first cutting polarizing plate is attached, which is sequentially supplied. step. The method of laminating a polarizing plate according to claim 1 or 2, wherein the first polarizing plate attaching step is performed by separating the first cut polarizing plate from the first release polarizing plate by the release film a first adhesive layer of the board, wherein the first cut polarizing plate is sequentially attached to the first substrate of the liquid crystal cell, and the second polarizing plate attaching step is separated from the release film by the aforementioned a second adhesive layer of the second cutting polarizing plate that is exposed by cutting the polarizing plate, and the second cutting polarizing plate is sequentially attached to the liquid crystal cell to which the first cutting polarizing plate is attached The aforementioned second base The steps of the board. The method of laminating a polarizing plate according to claim 1 or 2, wherein the first cut polarizing plate has a conductive layer. The method of laminating a polarizing plate according to claim 1 or 2, wherein the second cut polarizing plate has a conductive layer. The method for laminating a polarizing plate according to claim 1 or 2, wherein the surface resistivity of the conductive layer is 1.0 × 10 ¹² Ω / □ or less. The method of laminating a polarizing plate according to claim 1 or 2, wherein the switching element is a thin film transistor. A laminated system of a polarizing plate is characterized in that a first substrate is a surface of a liquid crystal cell having a liquid crystal layer between the first substrate and the second substrate, which is less likely to be electrically attenuated after charging, and is laminated on the first substrate. A polarizing plate of the same or different configuration, as a liquid crystal display panel, the laminated system of the polarizing plate includes: a first polarizing plate attaching device, which is wound into a reel shape and is long in a long first polarizing plate The first polarizing plate of the first release film is pulled out by the reel, and the long first polarizing plate is cut at predetermined intervals without cutting the long first release film, in order Forming a first cutting polarizing plate, and superposing each of the first cutting polarizing plates sequentially formed on the first substrate of the liquid crystal cells sequentially supplied, so as to overlap the first cutting polarizing plate and The liquid crystal cell is held between the first pressing member and the second pressing member, and passes between the first pressing member and the second pressing member, thereby sequentially attaching the first cutting polarizing plate In liquid crystal cells; And a second polarizing plate attaching device, which is disposed in a subsequent stage of the first polarizing plate attaching device, and is formed by winding a second release film having a long shape in a roll shape and a long second polarizing plate. The second polarizing plate original plate is pulled out by the reel, and the long second polarizing plate is cut at predetermined intervals without cutting the long second releasing film, and the second cutting polarizing plate is sequentially formed, and Each of the second cut polarizing plates sequentially formed is overlapped on the second substrate to which the liquid crystal cell of the first cut polarizing plate is attached, so that the second cut polarizing plate and the liquid crystal cell are overlapped And sandwiching between the third pressing member and the fourth pressing member, and passing between the third pressing member and the fourth pressing member, thereby sequentially attaching the second cutting polarizing plate to the liquid crystal Cell. The laminated system of the polarizing plate of claim 8, wherein the first polarizing plate attaching device is configured to fold the release film and sequentially peel the first cut polarizing plate from the release film, And the first cutting polarizing plate is sequentially attached to the first substrate of the liquid crystal cell sequentially supplied, and the second polarizing plate attaching device is configured to fold the release film and The release film is sequentially peeled off from the second cutting polarizing plate, and the second cutting polarizing plate is sequentially attached to the aforementioned liquid crystal cell to which the first cutting polarizing plate is attached. Two substrates. The laminated system of the polarizing plate of claim 8 or 9, wherein the first polarizing plate attaching device is configured to be separated from the release film The first adhesive layer of the first cutting polarizing plate exposed by the first cutting polarizing plate is peeled off, and the first cutting polarizing plate is sequentially attached to the first substrate of the liquid crystal cell, and the second The polarizing plate attaching device is configured to sequentially align the second cutting polarizing plate with the second adhesive layer exposed by the second cutting polarizing plate exposed by the release film The second substrate is attached to the liquid crystal cell to which the first polarizing plate is cut. The laminated system of the polarizing plate of claim 8 or 9, wherein the first cut polarizing plate has a conductive layer. The laminated system of the polarizing plate of claim 8 or 9, wherein the second cut polarizing plate has a conductive layer. The laminated system of the polarizing plate of claim 8 or 9, wherein the conductive layer has a surface resistance value of 1.0 × 10 ¹² Ω / □ or less. The laminated system of the polarizing plate of claim 8 or 9, wherein the switching element is a thin film transistor.