JP5314618B2 - Manufacturing method of liquid crystal display device - Google Patents

Abstract

Disclosed is a liquid crystal display device wherein a problem of having a possibility of scratching a polarization film in the manufacture steps, i.e., from the step of forming a module to the step of manufacturing a final product, is eliminated. Also disclosed is a method for manufacturing the liquid crystal display device. In the liquid crystal display device (1), a protection film (4) is bonded to the polarization film (3) such that the four corners (end portions) of the protection film (4) are positioned further inside of the polarization film (3) than the four corners (end portions) of the polarization film (3), more specifically, the width (W0) is 6-11 mm corresponding to the width (size) of the frame (5). Thus, a gap (W1) of 1 mm is formed between the frame (5) and the end portion of the protection film (4). Therefore, in the manufacture steps, i.e., the steps to the step of manufacturing the final product after being subjected to various assembly steps, a state wherein the protection film (4) is bonded to the polarization film (3) can be maintained, and the protection film (4) can be removed from the polarization film (3) at the end of the manufacture steps.

Description

  The present invention relates to a liquid crystal display device in which a polarizing plate is attached to a liquid crystal panel, and a method for manufacturing the liquid crystal display device.

  Polarizing films are widely used as polarized light supplying elements or polarized light detecting elements in liquid crystal display devices mounted on mobile devices such as notebook personal computers and mobile phones, and in various products such as large televisions. . For the purpose of protecting the surface of the polarizing film during the production of the liquid crystal display device, a protective film is bonded via an adhesive layer.

  For example, Patent Documents 1 and 2 describe a polarizing plate in which a protective film is bonded to the entire surface of a polarizing film.

  A liquid crystal display device in which a polarizing plate is attached to a liquid crystal panel is modularized by attaching a frame made of metal or resin to its four sides (peripheral portions), and further, various wirings and the like are made on the casing. By being assembled, the final product is a notebook personal computer, a mobile device such as a mobile phone, and a large television.

  When a frame is attached to the four sides of the liquid crystal display device to form a module, the four sides of the polarizing film are formed on the four sides of the frame body in order to prevent deterioration of the display screen due to light leaking from the peripheral portion of the liquid crystal display device. Attach the frame so that it is hidden inside. That is, when the polarizing film is modularized, its four sides (peripheral parts) are covered with a frame body with a width of about 5 to 10 mm.

Patent No. 4079716 (issued April 23, 2008) Patent No. 4307510 (issued on August 5, 2009) JP 2009-271516 A (released on November 19, 2009) JP 2009-271519 A (released on November 19, 2009)

  In the polarizing plates described in Patent Documents 1 and 2, a protective film is bonded to the entire surface of the polarizing film. For this reason, when attaching a frame to the four sides of a liquid crystal display device in which a polarizing plate is attached to a liquid crystal panel to form a module, it is necessary to peel off the protective film from the polarizing film in advance. That is, since the four sides (peripheral part) of the polarizing film are covered by the frame when modularized, the four sides (peripheral part) of the protective film are also covered in the same manner. The protective film cannot be peeled off. Therefore, in the polarizing plates described in Patent Documents 1 and 2, it is necessary to peel the protective film from the polarizing film before modularization.

  However, if the protective film is peeled off from the polarizing film before modularization, the polarizing film is exposed. For this reason, the liquid crystal display device is modularized, and further, there is a high possibility that the polarizing film is damaged in the manufacturing process from various assembly processes to the final product. When the polarizing film is damaged, it is necessary to replace the liquid crystal display device. In other words, in the conventional liquid crystal display device, there is a risk of scratching the polarizing film in the manufacturing process from modularization to the final product, which reduces the productivity and yield of the final product (the defect rate increases). )) Cannot be avoided.

  The present invention has been made in view of the above-mentioned problems, and its main purpose is to avoid the problem that the polarizing film may be damaged in the manufacturing process from modularization to the final product. An object of the present invention is to provide a liquid crystal display device that can be used and a method for manufacturing the liquid crystal display device.

  In order to solve the above-mentioned problems, the liquid crystal display device according to the present invention is a liquid crystal display device in which a polarizing plate in which a protective film is bonded to a polarizing film is bonded to a liquid crystal panel, and the protective film The end of is located inside the polarizing film with respect to the end of the polarizing film.

  In the liquid crystal display device according to the present invention, the end of the protective film is preferably located 6 to 11 mm inside the end of the polarizing film.

  The manufacturing method of the liquid crystal display device according to the present invention includes an attaching step of attaching a polarizing film to a liquid crystal panel, and an end portion of the protective film rather than an end portion of the polarizing film in order to solve the above-described problem. And a bonding step of bonding the protective film to the polarizing film so that the direction is located on the center side of the polarizing film.

  Moreover, it is preferable that the manufacturing method of the liquid crystal display device which concerns on this invention performs a bonding process after a sticking process.

  Moreover, as for the manufacturing method of the liquid crystal display device which concerns on this invention, it is preferable that the said sticking process is a process of sticking to a liquid crystal panel, cutting a long polarizing film.

  Moreover, as for the manufacturing method of the liquid crystal display device which concerns on this invention, it is preferable that the said bonding process is a process of bonding to a polarizing film, cutting a long protective film.

  According to said structure, the edge part of a protective film is located inside the said polarizing film rather than the edge part of a polarizing film. For this reason, even after the frame is attached to the four sides of the liquid crystal display device and modularized, that is, after the four sides (peripheral part) of the polarizing film are covered by the frame, the four sides (peripheral part) of the protective film ) Is not covered by the frame, the protective film can be peeled from the polarizing film. That is, when the frame is attached to the four sides of the liquid crystal display device to form a module, there is no need to peel off the protective film from the polarizing film in advance. In the manufacturing process up to, the state where the protective film is bonded to the polarizing film can be maintained. That is, the protective film can be peeled from the polarizing film at the end of the manufacturing process. This provides a liquid crystal display device capable of avoiding the problem that the polarizing film may be damaged in the manufacturing process from modularization to final product, and a method for manufacturing the liquid crystal display device can do.

  According to the liquid crystal display device and the manufacturing method thereof according to the present invention, since the end portion of the protective film is located inside the polarizing film rather than the end portion of the polarizing film, after modularizing the liquid crystal display device, Furthermore, the state which bonded the protective film to the polarizing film can be maintained in the manufacturing process from various assembly steps to the final product. That is, even after the four sides (peripheral part) of the polarizing film are covered with the frame, the protective film is peeled off from the polarizing film at the end of the manufacturing process because the four sides (peripheral part) of the protective film are not covered with the frame. be able to.

  Therefore, according to the liquid crystal display device and the manufacturing method thereof according to the present invention, there is no possibility that the polarizing film is damaged in the manufacturing process from modularization to the final product. Can be increased (the defective rate can be decreased).

1 is a plan view showing a schematic configuration of a liquid crystal display device according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows an example of the manufacturing method of the liquid crystal display device which concerns on this invention, and shows the structure of the outline of a manufacturing apparatus.

  The liquid crystal display device according to the present invention is a liquid crystal display device in which a polarizing plate formed by bonding a protective film to a polarizing film is bonded to a liquid crystal panel, and an end portion of the protective film is formed of the polarizing film. It is the structure located inside the said polarizing film rather than an edge part. Moreover, the manufacturing method of the liquid crystal display device according to the present invention includes an attaching step of attaching a polarizing film to a liquid crystal panel, and the end of the protective film at the center of the polarizing film rather than the end of the polarizing film. It is the structure including the bonding process of bonding the said protective film to a polarizing film so that it may be located in the side.

  An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. However, the present invention is not limited to this, and can be implemented in a mode in which various modifications are added within the range described.

[Liquid Crystal Display]
An example of the configuration of the liquid crystal display device according to the present invention will be described. As shown in FIG. 1, in the liquid crystal display device 1 according to the present embodiment, a polarizing film 3 and a protective film 4 are laminated in this order on the front and back surfaces of a liquid crystal panel 2 (in FIG. 1, the liquid crystal panel is shown). The polarizing film and the protective film on the back surface of 2 are omitted without being shown).

  A known liquid crystal panel is preferably used as the liquid crystal panel 2. More specifically, the liquid crystal panel 2 includes a known liquid crystal panel that includes a pair of substrates such as a glass substrate and a liquid crystal layer, and an alignment film is disposed between the substrate and the liquid crystal layer.

  As the polarizing film 3, a known polarizing film is preferably used. More specifically, as the polarizing film 3, protective films are attached to both surfaces of the polarizer film, and an adhesive layer is formed on the protective film on the side attached to at least the liquid crystal panel 2. The well-known polarizing film is mentioned. The pressure-sensitive adhesive layer is formed in order to bond a release film (described later) to the polarizing film 3 and to attach the polarizing film 3 to the liquid crystal panel 2.

  Examples of the polarizer film include, for example, polyvinyl alcohol, partially formalized polyvinyl alcohol, partially saponified ethylene-vinyl acetate copolymer, a film made of hydrophilic polymer such as cellulose, uniaxial stretching, and pigment such as iodine. And a film subjected to various processes such as hue adjustment. However, the manufacturing method of a polarizer film is not limited to said manufacturing method, A well-known polarizer film is used suitably.

  Examples of the protective film include TAC (triacetylcellulose) film, cycloolefin resin film, cellulose acetate resin film such as diacetylcellulose, polyester resin film such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resin film, Known films such as an acrylic resin film and a polypropylene resin film can be used.

  Although the thickness of the polarizing film 3 is not specifically limited, Generally it is 10 micrometers or more and 300 micrometers or less. The polarizing film 3 may further include other layers in addition to the three layers (a protective layer, a polarizer film, and a protective layer) as long as there is no practical problem. Specifically, for example, the polarizing film 3 may further include a pressure-sensitive adhesive layer (may be an adhesive layer) that adheres the polarizer film and the protective film.

  The polarizing film 3 is adhered to both surfaces of the liquid crystal panel 2 so as to cover the entire display area of the liquid crystal panel 2 (the entire part of the display screen).

  As the protective film 4, a known protective film is suitably used. More specifically, examples of the protective film 4 include known protective films such as a polyester film, a polyethylene terephthalate film, a polyethylene film, a polypropylene film, and a polystyrene film.

  In the protective film 4, an adhesive layer is formed on the surface to be bonded to the polarizing film 3. The pressure-sensitive adhesive layer is formed in order to bond the protective film 4 to the polarizing film 3. The thickness of the protective film 4 is not particularly limited, but is generally 10 μm or more and 100 μm or less.

  In the liquid crystal display device 1 according to the present embodiment, the polarizing film 3 and the protective film 4 are laminated in this order on the front and back surfaces of the liquid crystal panel 2, and as shown in FIG. A frame 5 made of metal or resin is attached to the periphery) to form a module (in FIG. 1, the three-sided frame 5 is not shown but not shown). That is, when the frame 5 is attached to the four sides of the liquid crystal display device 1 to form a module, the polarizing film 3 is prevented from being deteriorated by preventing leakage of light from the peripheral edge of the liquid crystal display device 1. The frame body 5 is attached so that the four sides are hidden inside the frame body 5. Although depending on the width of the frame body 5, when the polarizing film 3 is modularized, its four sides (peripheral portions) are covered with the frame body 5 by about 5 to 10 mm in width.

Therefore, in the liquid crystal display device 1 according to the present embodiment, more specifically, the four sides (ends) of the protective film 4 are positioned inside the polarizing film 3 rather than the four sides (ends) of the polarizing film 3. Specifically, the protective film 4 is bonded to the polarizing film 3 so that the width W ₀ is 6 to 11 mm according to the width (size) of the frame body 5. The width W ₀ refers to the distance from the end of the polarizing film 3 to the adjacent end of the protective film 4. More specifically, when the peripheral portion of the polarizing film 3 is covered by the frame 5 with a width of 5 mm, the protective film 4 is bonded to the polarizing film 3 so that the width W ₀ is 6 mm. When the peripheral portion of the polarizing film 3 is covered by the body 5 with a width of 10 mm, the protective film 4 is bonded to the polarizing film 3 so that the width W ₀ is 11 mm. In addition, a polarizing plate is formed by bonding the protective film 4 to the polarizing film 3.

Thus, when modularized, a gap W1 of about ₁ mm is formed between the frame 5 and the adjacent end of the protective film 4. That is, the width W ₀ is set such that the gap W ₁ is formed by about ₁ mm according to the width of the frame 5. Therefore, it is possible to maintain the state in which the protective film 4 is bonded to the polarizing film 3 in the manufacturing process from various assembly steps to the final product. That is, in the liquid crystal display device 1 according to the present embodiment, the end portion of the protective film 4 is located inside the polarizing film 3 relative to the end portion of the polarizing film 3, so that the liquid crystal display device 1 is a module. In the manufacturing process until the final product is obtained through various assembly processes after the conversion, the state in which the protective film 4 is bonded to the polarizing film 3 can be maintained. That is, even after the four sides (peripheral part) of the polarizing film 3 are covered with the frame body 5, the four sides (peripheral part) of the protective film 4 are not covered with the frame body 5. The protective film 4 can be peeled from 3. Therefore, since there is no possibility that the polarizing film 3 is damaged, the productivity and yield of the final product can be increased (the defective rate is decreased).

The gap W ₁ is not limited to the exemplified 1 mm, and may be provided so that the protective film 4 can be peeled from the polarizing film 3 at the end of the manufacturing process. In view of the purpose of protection, it is desirable to be as narrow as possible.

Since the width W ₀ in accordance with the width of the frame body 5 is set, the width W ₀ of the four sides of the protective film 4 may be the same as each other or may be different. Therefore, the shape of the protective film 4 and the shape of the polarizing film 3 may be different from each other, or may be similar (that is, so-called slightly smaller dimensions).

  In the liquid crystal display device 1 according to the present embodiment, the size (area) of the protective film 4 is smaller than the size (area) of the polarizing film 3. Therefore, since the usage-amount of the protective film 4 with respect to the polarizing film 3 becomes smaller than before, cost can be reduced.

  In addition, since the peripheral part of the polarizing film 3 is in a state where the surface is not protected by the protective film 4, there is a risk of scratches. However, the peripheral portion of the polarizing film 3 is covered with the frame body 5 by attaching the frame body 5 to the four sides of the liquid crystal display device 1 to form a module. That is, even if the peripheral edge portion of the polarizing film 3 is damaged, it is covered with the frame 5 so that no substantial adverse effect occurs. For this reason, there is no possibility that the quality of the display screen of the liquid crystal display device 2 will deteriorate.

[Manufacturing method of liquid crystal display device]
An example of the configuration of a manufacturing apparatus that employs the method for manufacturing a liquid crystal display device according to the present invention will be described. As shown in FIG. 2, the liquid crystal display device manufacturing apparatus 10 according to the present embodiment is a manufacturing apparatus that employs a so-called roll to panel method for continuously manufacturing the liquid crystal display device 1. It has a two-stage structure in which a film conveyance mechanism 20 is provided in the part and a panel conveyance mechanism 30 is provided in the upper (second floor) part. Thereby, space saving of the manufacturing apparatus 10 can be achieved.

  The film transport mechanism 20 unwinds the long polarizing film original fabric 3a wound up in a roll shape and transports it to the sticking unit 31, and winds the long release film 3b that is no longer needed. 21 and a protective film transport mechanism 22 that unwinds the long protective film raw material 4a wound up in a roll shape and transports it to the bonding section 32, and winds up the long release film 4b that is no longer necessary. I have. And the said polarizing film conveyance mechanism 21 and the protective film conveyance mechanism 22 are arrange | positioned at linear form.

  The said polarizing film original fabric 3a is a film laminated body comprised from the polarizing film 3, the adhesive layer, and the peeling film 3b, and the surface of the polarizing film 3 by which the liquid crystal panel 2 is affixed on an adhesive layer ( A release film 3b that can be peeled off via an adhesive layer) is bonded. The pressure-sensitive adhesive layer is not particularly limited, and is configured by applying a known pressure-sensitive adhesive (or adhesive) used in the technical field. What is necessary is just to set the thickness of an adhesive layer suitably.

  The release film (also referred to as a protective film or a separator) 3b does not damage the surface of the polarizing film 3 (the surface that is attached to the liquid crystal panel 2) until the polarizing film 3 is attached to the liquid crystal panel 2. The polarizing film 3 is peeled from the polarizing film 3 when the polarizing film 3 is attached to the liquid crystal panel 2. As the release film 3b, for example, a film of polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, or the like can be used. The thickness of the release film 3b is not particularly limited, but is generally 10 μm or more and 100 μm or less. Moreover, the width | variety of the polarizing film original fabric 3a, ie, the width | variety of the polarizing film 3, is about 300-1500 mm in general.

  In addition, in the polarizing film original fabric 3a, although the peeling film 3b is bonded by one surface of the polarizing film 3, the protective film is not bonded by the other surface. However, since the polarizing film original fabric 3a is wound up in a roll shape, the surface of the polarizing film 3 on the side where the release film is not bonded is covered with the overlapped release film 3b and is damaged. There is no fear.

  The said protective film raw fabric 4a is a film laminated body comprised from the protective film 4, the adhesive layer, and the peeling film 4b, and the adhesive layer ( A release film 4b that can be peeled off via an adhesive layer may be bonded. The pressure-sensitive adhesive layer is not particularly limited, and is configured by applying a known pressure-sensitive adhesive (or adhesive) used in the technical field. What is necessary is just to set the thickness of an adhesive layer suitably.

  The release film (also referred to as a protective film or a separator) 4b protects the adhesive layer from dust until the protective film 4 is bonded to the polarizing film 3, and the protective film 4 is polarized. It peels from the protective film 4 when bonding to the film 3. As the release film 4b, for example, a film of polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, or the like can be used. The thickness of the release film 4b is not particularly limited, but is generally 10 μm or more and 100 μm or less. Further, the width of the protective film original fabric 4a, that is, the width of the protective film 4 is set to be 12 to 22 mm narrower than the width of the polarizing film 3 in accordance with the width of the frame 5 (FIG. 1). .

  The polarizing film transport mechanism 21 located on the upstream side in the transport direction of the liquid crystal panel 2 includes an unwinding unit 21a, a winding unit 21b, a half cutter (not shown), a knife edge 21c, and a roller group 21d. A long polarizing film original fabric 3a is installed in the unwinding portion 21a, and the polarizing film original fabric 3a is unwound. The said polarizing film original fabric 3a is wound up by the unwinding part 21a so that the direction of the absorption axis of the polarizing film 3 may be located in the conveyance direction. The winding part 21b winds up the long release film 3b. The polarizing film transport mechanism 21 is provided with an unwinding portion 21a and a winding portion 21b so that when the remaining amount of the polarizing film original fabric 3a decreases, it can be switched to a new polarizing film original fabric in a short time. You may have two.

  The half cutter is provided on the upstream side (the unwinding portion 21a side) from the knife edge 21c, and half-cuts the polarizing film original fabric 3a to cut the polarizing film 3 and the adhesive layer. That is, the half cutter cuts the long polarizing film 3 to a predetermined length without cutting the release film 3b. As the half cutter, a known cutter such as a blade or a laser cutter is preferably used.

  The knife edge 21c peels the peeling film 3b from the polarizing film 3 cut into a predetermined length. The pressure-sensitive adhesive layer formed between the polarizing film 3 and the release film 3b remains on the polarizing film 3 side after the release film 3b is released.

  21 d of roller groups are provided so that fixed tension | tensile_strength may be applied to the polarizing film original fabric 3a, and the said polarizing film original fabric 3a may be conveyed.

  The protective film transport mechanism 22 located on the downstream side in the transport direction of the liquid crystal panel 2 has the same configuration as the polarizing film transport mechanism 21, and includes an unwinding part 22a, a winding part 22b, a half cutter (not shown), A knife edge 22c and a roller group 22d are provided. A long protective film original fabric 4a is installed in the unwinding portion 22a, and the protective film original fabric 4a is unwound. The winding portion 22b is configured to wind up the long release film 4b. In addition, the protective film conveyance mechanism 22 sets the unwinding part 22a, the winding part 22b, etc. so that it can switch to a new protective film original fabric in a short time when the remaining amount of the protective film original fabric 4a decreases. You may have two.

  The half cutter is provided on the upstream side (the unwinding portion 22a side) from the knife edge 22c, and the protective film original fabric 4a is half-cut to cut the protective film 4 and the adhesive layer. That is, the half cutter cuts the long protective film 4 to a length shorter by 12 to 22 mm than the length of the polarizing film 3 without cutting the release film 4b. As the half cutter, a known cutter such as a blade or a laser cutter is preferably used.

  The knife edge 22c peels the peeling film 4b from the protective film 4 cut into a predetermined length. The pressure-sensitive adhesive layer formed between the protective film 4 and the release film 4b remains on the protective film 4 side after the release film 4b is peeled off.

  21 d of roller groups are provided so that fixed tension | tensile_strength may be applied to the protective film original fabric 4a, and the said protective film original fabric 4a may be conveyed.

  The panel transport mechanism 30 includes a sticking unit 31, a bonding unit 32, and a plurality of transport rollers (not shown). The panel transport mechanism 30 transports the sheet-like liquid crystal panel 2 by driving the transport roller and sticks. The polarizing film 3 and the protective film 4 unwound by the film transport mechanism 20 by the unit 31 and the bonding unit 32 are bonded and bonded to the surface of the liquid crystal panel 2 (that is, a polarizing plate is bonded). It has become. The panel transport mechanism 30 rectifies downflow (supply of clean air) from above the liquid crystal panel 2, thereby transporting, sticking, and pasting the liquid crystal panel 2 in a stable state. Be able to.

  The panel transport mechanism 30 transports the liquid crystal panel 2 along the polarizing film transport mechanism 21 and the protective film transport mechanism 22 arranged in a straight line. That is, the manufacturing apparatus 10 has a transport direction center line of the liquid crystal panel 2 transported by the panel transport mechanism 30 and a transport direction center line of the polarizing film 3 transported by the polarizing film transport mechanism 21 when viewed from above. Each transport mechanism is arranged so that the center line in the transport direction of the protective film 4 transported by the protective film transport mechanism 22 coincides. Therefore, the manufacturing apparatus 10 has a structure in which each transport mechanism is arranged in a straight line and is not arranged in a complicated shape such as an L-shape, so that the installation is very simple and the area efficiency is excellent. ing.

  The sticking part 31 is composed of a pair of nip rolls 31a and 31a forming a nip part, and has a function of sticking the polarizing film 3 to the surface of the liquid crystal panel 2 via an adhesive layer. And the polarizing film 3 conveyed to the sticking part 31 is aligned with the liquid crystal panel 2 (more specifically, the conveying direction) so as to cover the entire display area of the liquid crystal panel 2 (the entire surface of the display screen). Is aligned to the liquid crystal panel 2. As the nip rolls 31a and 31a, known nip rolls such as a pressure roll and a pressure roll are preferably used. Further, the nip rolls 31a and 31a can appropriately adjust the pressure (nip pressure) and temperature of the nip portion as necessary.

  The bonding part 32 is composed of a pair of nip rolls 32 a and 32 a that form a nip part, and has a function of bonding the protective film 4 to the surface of the polarizing film 3 via an adhesive layer. And as for the protective film 4 conveyed by the sticking part 32, the edge part (more specifically, the front-end | tip part of a conveyance direction) is the edge part (more specifically, the front-end | tip of a conveyance direction) of the said polarizing film 3. Part) is aligned so as to be located inside the polarizing film 3 and bonded to the polarizing film 3. As the nip rolls 32a and 32a, known nip rolls such as a pressure-bonding roll and a pressure roll are preferably used. Further, the nip rolls 32a and 32a can appropriately adjust the pressure (nip pressure) and temperature of the nip portion as necessary. In addition, a polarizing plate is formed by bonding the protective film 4 to the polarizing film 3.

  The manufacturing apparatus 10 includes a pair of film transport mechanisms 20 and a turning reversal mechanism that turns and reverses the liquid crystal panel 2 so that the polarizing film 3 can be attached to both surfaces of the liquid crystal panel 2. (In FIG. 2, one of the film transport mechanisms 20 and the turning inversion mechanism are not shown in the figure). The turning reversing mechanism includes, for example, a suction mechanism that sucks and turns the liquid crystal panel 2 and a robot arm mechanism that turns the liquid crystal panel 2 with the liquid crystal panel 2 interposed therebetween, and turns (turns) the liquid crystal panel 2 by 90 °. ) And 180 degrees (turn over). Therefore, after the polarizing film 3 and the protective film 4 are bonded and bonded to one surface by the first film transport mechanism 20, the liquid crystal panel 2 is swung and reversed by the swivel reversing mechanism. The polarizing film 3 and the protective film 4 are bonded and bonded to the other surface by the eye film transport mechanism 20 to obtain the liquid crystal display device 1.

  Further, the manufacturing apparatus 10 includes a control unit (not shown) that controls the operation of each of the transport mechanisms. That is, the control unit controls the transport speed of the liquid crystal panel 2 in the panel transport mechanism 30, the transport speed of the polarizing film original fabric 3 a between the unwinding section 21 a and the winding section 21 b in the polarizing film transport mechanism 21, and the polarizing film 3 by a half cutter. Cutting timing (setting of the length in the conveyance direction of the polarizing film 3), the conveyance speed of the protective film original 4a between the unwinding portion 22a and the winding portion 22b in the protective film conveyance mechanism 22, and the protective film 4 by a half cutter Cutting timing (setting of the length in the transport direction of the protective film 4), sticking timing of the polarizing film 3 to the liquid crystal panel 2 by the sticking part 31 (positioning of the polarizing film 3 with respect to the liquid crystal panel 2), and bonding Timing of attaching the protective film 4 to the polarizing film 3 by the portion 32 (polarizing film Positioning of the protective film 4 against), and nip roll 31a · 31a, and 32a · 32a of the pressure (nip pressure) various manufacturing conditions such as regulation and temperature control and to control. And what kind of control a control part performs concretely is inputted (instructed) in advance by a user such as an operator.

  In addition, the polarizing film 3 is stuck on both surfaces of the liquid crystal panel 2 by changing the arrangement (and the number) of the polarizing film conveying mechanism 21 and the protective film conveying mechanism 22 and the turning inversion mechanism in the pair of film conveying mechanisms 20. Then, the protective film 4 can be bonded. That is, the first polarizing film transport mechanism 21, the turning inversion mechanism, the second polarizing film transport mechanism 21, the first protective film transport mechanism 22, the turning inversion mechanism, and the second protective film transport mechanism 22 The liquid crystal display device 1 can also be manufactured by arranging in this order. In this case, the liquid crystal panel 2 is rotated and reversed by the turning reversing mechanism after the polarizing film 3 is adhered to one surface by the first polarizing film transport mechanism 21, and then the second polarizing film After the polarizing film 3 and the protective film 4 are pasted and bonded to the other surface by the film transport mechanism 21 and the first protective film transport mechanism 22, they are swung and reversed again by the swivel reversing mechanism. The protective film 4 is bonded to the one surface by the second protective film transport mechanism 22, whereby the liquid crystal display device 1 is obtained.

  A method for manufacturing the liquid crystal display device 1 using the manufacturing apparatus 10 having the above configuration will be described. The manufacturing process of the liquid crystal display device 1 mainly includes a transport process, a sticking process, a bonding process, and the like.

  First, as a transport process, the liquid crystal panel 2 is transported at a constant speed by driving a plurality of transport rollers in the panel transport mechanism 30. This conveyance process is also performed while performing the sticking process and the bonding process. That is, the conveyance process is performed throughout the manufacturing process.

  Next, while driving the unwinding part 21a and the winding part 21b in the polarizing film transporting mechanism 21, the polarizing film original fabric 3a is transported, and the long polarizing film 3 is cut into a set length by a half cutter. To do. And while peeling the peeling film 3b from the polarizing film 3 with the knife edge 21c, and aiming at the timing of sticking of the polarizing film 3 with respect to the liquid crystal panel 2, that is, aligning the polarizing film 3 with respect to the liquid crystal panel 2, The polarizing film 3 is conveyed to the nip part of the sticking part 31. Then, the polarizing film 3 is stuck on the liquid crystal panel 2 while applying a predetermined pressure (nip pressure) at the sticking portion 31 in the panel transport mechanism 30 (sticking step). Therefore, the sticking step is a step of sticking to the liquid crystal panel 2 while cutting the long polarizing film 3.

  Subsequently, the protective film original fabric 4a is conveyed by driving the unwinding portion 22a and the winding portion 22b in the protective film conveying mechanism 22, and the long protective film 4 is cut into a set length by a half cutter. To do. And while peeling the peeling film 4b from the protective film 4 with the knife edge 22c, while aiming at the timing of bonding of the protective film 4 with respect to the polarizing film 3, ie, performing alignment of the protective film 4 with respect to the polarizing film 3, The said protective film 4 is conveyed to the nip part of the bonding part 32. FIG. Thereafter, the protective film 4 is bonded to the polarizing film 3 while applying a predetermined pressure (nip pressure) at the bonding portion 32 in the panel transport mechanism 30 (bonding step). That is, the protective film 4 is bonded to the polarizing film 3 so that the end of the protective film 4 is located closer to the center of the polarizing film 3 than the end of the polarizing film 3. Therefore, the bonding step is a step of bonding to the polarizing film 3 while cutting the long protective film 4. Moreover, the polarizing plate was formed by bonding the protective film 4 to the polarizing film 3.

  Thereafter, as the turning inversion step, the liquid crystal panel 2 having the polarizing film 3 and the protective film 4 attached and bonded to one surface (that is, the polarizing plate attached) is turned and inverted by the turning inversion mechanism. . Next, the polarizing film 3 and the protective film 4 are bonded and bonded to the other surface of the liquid crystal panel 2 by performing the same bonding process and bonding process as the above-described bonding process and bonding process (that is, A polarizing plate is attached). Thereby, the liquid crystal display device 1 according to the present embodiment is manufactured.

  According to the method for manufacturing a liquid crystal display device according to the present invention, the end portion of the protective film 4 in the manufactured liquid crystal display device 1 is positioned inside the polarizing film 3 relative to the end portion of the polarizing film 3. For this reason, after the liquid crystal display device 1 is modularized, the state in which the protective film 4 is bonded to the polarizing film 3 can be maintained in the manufacturing process from various assembly processes to the final product. That is, even after the four sides (peripheral part) of the polarizing film 3 are covered with the frame body 5, the four sides (peripheral part) of the protective film 4 are not covered with the frame body 5. The protective film 4 can be peeled from 3. Therefore, since there is no possibility that the polarizing film 3 is damaged, the productivity and yield of the final product can be increased (the defective rate is decreased).

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention. For example, the number of roller groups in the manufacturing apparatus or the arrangement of each transport mechanism including the unwinding unit and the winding unit is not limited to the illustrated number and arrangement. Moreover, it is good also as a structure which supplies a protective film with a sheet | seat (chip) instead of supplying with a roll.

  According to the liquid crystal display device and the manufacturing method thereof according to the present invention, there is no risk of scratching the polarizing film in the manufacturing process from modularization to the final product, so the productivity and yield of the final product are increased. (Defect rate can be reduced). Therefore, the liquid crystal display device and the manufacturing method thereof according to the present invention can be widely used in various industries that manufacture mobile devices such as notebook personal computers and mobile phones, and large televisions.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 3 Polarizing film 3a Polarizing film original fabric 3b Release film 4 Protective film 4a Protective film original fabric 4b Release film 5 Frame body 10 Manufacturing apparatus 20 Film conveyance mechanism 21 Polarizing film conveyance mechanism 22 Protective film conveyance mechanism 30 Panel transport mechanism 31 Adhering part 32 Adhering part

Claims (3)

An attaching step of attaching a polarizing film to the liquid crystal panel;
A bonding step of bonding the protective film to the polarizing film such that the end of the protective film is positioned closer to the center of the polarizing film than the end of the polarizing film ,
The said bonding process is a process of bonding to a polarizing film, cutting a long protective film, The manufacturing method of the liquid crystal display device characterized by the above-mentioned . The method for manufacturing a liquid crystal display device according to claim 1, wherein a bonding step is performed after the bonding step. The method for manufacturing a liquid crystal display device according to claim 1 , wherein the sticking step is a step of sticking to a liquid crystal panel while cutting a long polarizing film.

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