JP2010066283A - Optical film sticking device, optical film sticking method, and manufacturing method of display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stick an optical film such as a polarizing plate at high speed on a display device, without causing wrinkles or bubbles to be generated. <P>SOLUTION: A polarizing plate 2 is stuck and held on a large-diameter roller 10, having a surface on which a rubber 10b having an adhesive surface is formed, and the polarizing plate 2 is stuck on a liquid crystal panel 1. A part 10a, having a reduced adhesive strength, is formed on the surface 10b of the roller 10, corresponding to a part where contact of the polarizing plate 2 with the liquid crystal panel 1 is started, and after the polarizing plate 2 is stuck on the liquid crystal panel 1, the polarizing plate 2 can be readily separated from the roller 10. Consequently, the polarizing plate 2 can be stuck on the liquid crystal panel 1, in a state without the generation of bubbles or wrinkles. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical film sticking apparatus, an optical film sticking method, and a display panel for sticking an optical film such as a polarizing plate, a retardation film, and a light reducing film to a display panel such as a liquid crystal panel or a plasma panel. In particular, the present invention relates to an optical film application apparatus, an optical film application method, and a display panel manufacturing method that are suitable for attaching an optical film to a display panel after peeling the adhesive protective film from the optical film.

  In the manufacturing process of a liquid crystal display device, a liquid crystal panel is formed by sealing liquid crystal between a TFT (Thin Film Transistor) substrate and a color filter substrate, and then a polarizing plate is attached to the front and back surfaces of the liquid crystal panel. . At this time, there may be a case where a retardation plate is further attached, or a case where the retardation plate is integrated with a polarizing plate in advance.

  In a plasma display, in general, in order to reduce reflection on the phosphor surface due to disturbance light, a light-reducing film is attached to the surface of the plasma panel. In addition, an anti-scattering film may be stretched for safety.

Generally, a pasting apparatus is used for pasting these films. An adhesive is applied to one side of the polarizing plate and the light-reducing film, and an adhesive protective film is stretched for protecting the adhesive. In the film sticking apparatus, the pressure-sensitive adhesive protective film is peeled off and attached to a liquid crystal panel or a plasma panel. Examples of these methods include those described in Patent Document 1, Patent Document 2, and Patent Document 3.
JP 63-212903 A JP-A-6-255063 JP-A-8-262429

  The conventional method has a drawback that bubbles and wrinkles are likely to occur when the polarizing plate is attached. This tendency tends to become more prominent as the attaching speed is increased and the polarizing plate is made thinner.

  In the method described in Patent Document 1, after the front edge of the polarizing plate held by the polarizing plate holder is brought into contact with the liquid crystal panel, the polarizing plate is obtained while moving with pressure applied by a pressure roller while obtaining sufficient pressure. The air bubbles are avoided by pressing them against the LCD panel sequentially. However, in this method, the effect of the pressure roller cannot be obtained at the stage where the polarizing plate starts to contact the liquid crystal panel, and sticking starts in an incomplete pressure state, and bubbles are likely to be generated at the position where the sticking starts. It cannot be avoided. Further, at the end of the sticking, the polarizing plate is separated from the polarizing plate holder and suddenly comes into contact with the liquid crystal panel. Although this drawback is reduced by slowing the feed speed, in this case, productivity is lowered.

  In Patent Document 2, in addition to the method of Patent Document 1, it is intended to avoid wrinkles by keeping the angle between the liquid crystal panel and the optical film constant while applying a certain tension to the polarizing plate being attached. However, in this case as well, no consideration is given to the point that tension and angle cannot be maintained at the beginning and end of application, and the defect that bubbles and wrinkles are likely to occur at the start of application has not been improved. In the second embodiment of Patent Document 2, a method of sticking a polarizing plate to an arc-shaped polarizing plate holder by vacuum or weak adhesion is proposed, but sufficient suction force can be obtained up to the end by vacuum suction. In some cases, bubbles are easily generated. When giving weak adhesive strength, it is difficult to balance the adhesive strength. Further, in this embodiment, since the operation is intermittent, it is expected that high-speed operation becomes difficult.

  Compared with the vacuum suction of Patent Document 2, the method of Patent Document 3 is to uniformly form the vacuum suction holes with a large number of fine air intake holes and to spread the suction to every corner. In this method, in order to obtain a sufficient adsorption force, it is necessary to enlarge the intake holes or increase the density of the holes. In this case, most of the air is sucked from the vacant part after peeling, so that the adsorption force is difficult to increase. Further, when the suction hole is made larger, the roller surface becomes rough, and there may be a drawback that the polarizing plate is easily damaged.

  On the other hand, in the prior art, there was an idea of transporting a film-like polarizing plate using surface adhesive force such as a rubber roller, but in reality, the polarizing plate is composed of a plurality of layers, and a method for realizing appropriate adhesive force Is simply not possible.

  For example, in the case of the upper polarizing plate, it is composed of a number of layers such as a protective film for preventing scratches on the top, a gloss control layer on the surface layer, a surface layer carrier film, a polarizing material layer, a back surface carrier film, a back surface adhesive layer, and an adhesive protective film. ing. Therefore, it is necessary to hold the polarizing plate immediately before attaching the polarizing plate, peel off the adhesive protective film to expose the back surface adhesive layer, and apply it to the liquid crystal panel without delay. When the adhesive layer protective film is peeled off and applied to the liquid crystal panel for a long period of time, undesirable situations such as attachment of airborne foreign substances and deterioration due to moisture absorption of the adhesive are caused. A similar phenomenon occurs when a light-reducing film is attached to a plasma display panel.

  At this time, when the optical film such as the polarizing plate or the light-reducing film is not reliably held, the optical film may fall off when the adhesive layer protective film is peeled off. For this reason, a method of holding the optical film by vacuum suction is frequently used. However, when a vacuum suction hole is used, the optical film is sucked into the inside thereof, so that the flatness is impaired, and there is a possibility that air bubbles are caught between the optical film and the display panel. When fine holes are used, the flow resistance increases, and the suction force is suddenly lost at the start of peeling. Therefore, there is a possibility that the peeling force for peeling off the adhesive layer protective film cannot be withstood. Therefore, it is necessary to use a large number of fine adsorption holes, and a porous material may be used. In this case, since a large number of adsorption holes penetrate each other, it is difficult to switch between the adsorption area and the non-adsorption area. It becomes an obstacle to switch the size and shape.

  On the other hand, when using weak adhesive force for holding | maintenance of an optical film, the adhesive force of the holding member of an optical film needs to be weaker than the adhesive force of the back surface adhesive layer of an optical film. At the same time, the adhesive force of the holding member of the optical film needs to be stronger than the peeling force of the adhesive layer protective film of the optical film. When the former is not satisfied, naturally, the optical film cannot be delivered to the display panel after the optical film is attached. If the latter cannot be satisfied, the optical film may fall off in the step of peeling the adhesive layer protective film.

  Further, the presence of a scratch-protecting surface protective film generally complicates the problem. The surface protective film for preventing scratches is a product that is peeled off and discarded as a final product, and its adhesive strength is limited to a weak value. Since the surface protective film cannot be removed when attaching the optical film, the adhesive strength for holding the optical film must be stronger than the peel strength of the adhesive layer protective film and weaker than the peel strength of the surface protective film. Arise. There is a problem that it is difficult to obtain a holding force that satisfies these conditions simultaneously with various optical films.

  The present invention solves the problems of the prior art as described above. That is, the optical film sticking apparatus of the present invention uses a roller having adhesiveness on the surface as the optical film holding means, and holds the optical film such as a polarizing plate or a dimming film up to the end. Thereby, also when peeling the adhesive protective film of an optical film, reliable holding | maintenance can be performed.

  In addition, since the optical film is smoothly held on the holding means and touches the display panel, there is no sudden change in the pressing pressure at the start of sticking or a sudden change in the film traveling direction. It is hard to produce. Furthermore, a portion capable of partially weakening the adhesive force is provided at a portion where the end of the optical film of the holding means comes into contact, and after the pressurization to the display panel of the optical film is finished, the holding means smoothly The optical film peels off. For this reason, it is possible to avoid the dropping of the protective film for preventing surface scratches of the optical film, which is likely to occur when stickiness retention is used in the conventional method.

  Further, the optical film attaching method of the present invention is such that an optical film such as a polarizing plate or a light-reducing film is pressed and adhered to an adhesive roller that is a holding means for holding the optical film, and the end of the optical film Hold securely until. Thereby, even when the adhesive protective film of the optical film is peeled off, there is no fear that the optical film is peeled off.

  In addition, since the optical film is securely held by the holding means and is smoothly brought into contact with the display panel, it is not necessary to cause the optical film to undergo sudden pressure fluctuations or sudden rotations in the traveling direction at the start of application. Can be pasted without generating bubbles in the part. Furthermore, since the site | part which reduces adhesive force is previously provided in the site | part which the edge part of an optical film contacts, after pressing an optical film against a display panel, an optical film can be smoothly peeled from a roller. For this reason, there is no fear of dropping off the protective film for preventing surface scratches that is often provided on the surface of the optical film.

  According to the present invention, as the above-mentioned optical film holding method, an adhesive optical film holding method without the occurrence of bubbles and size switching is used, and the protective film for preventing surface scratches is not dropped off. Peeling of the layer protective film can be realized stably. For this reason, compared with the conventional optical film affixing method, a high-speed and stable film affixing becomes possible, and a significant improvement in productivity is expected.

  Hereinafter, the contents of the present invention will be described in detail using examples.

  A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of a pasting apparatus for realizing pasting of the present invention. The liquid crystal panel 1 is held and transported by transport rollers (not shown) on the front and back surfaces. On the other hand, the polarizing plate 2 is supplied until it contacts and adheres to the adhesive roller 10 by a feed mechanism (not shown). At this time, the polarizing plate 2 is pressed to a position where the leading edge is applied to the weakly adhesive portion 10 a provided in advance on the surface of the adhesive roller 10.

  Here, the adhesive roller 10 is formed by forming a butyl-based adhesive rubber around the metal roller 10c to form an adhesive rubber 10b, and a part thereof is subjected to weak adhesion treatment to form a weakly adhesive part 10a. The weak adhesion treatment is exemplified by a surface treatment with a fluororesin coat or the like. Thereafter, the polarizing plate 2 is propelled according to the rotation of the adhesive roller, is pressed against the surface of the adhesive roller 10 by the pressure roller 11, and is fixed to the adhesive rubber layer formed on the surface of the adhesive roller. When the adhesive roller 10 further rotates in this state, the leading edge of the polarizing plate 2 reaches the position of the peeling unit 12.

  The peeling unit 12 is composed of a part having an adhesive tape 12b wound around the surface of the roller 12a and having an adhesive layer on the outer surface. The peeling unit 12 contacts the adhesive roller 10 immediately before the leading edge of the polarizing plate 2 reaches the position of the peeling unit 12. Then, the pressure-sensitive adhesive tape on the surface of the peeling unit 12 winds up the pressure-sensitive adhesive protective film 2 a provided on the surface layer of the polarizing plate 2. At this time, since the adhesive force of the adhesive protective film 2a is smaller than the adhesive force of the surface of the adhesive roller 10, there is no possibility that the main body of the polarizing plate 2 is peeled off from the adhesive roller 10 together with the adhesive protective film 2a.

  After that, the wound adhesive protective film 2a shown in FIG. 6 is gripped by a chuck 12c (not shown in FIGS. 1 and 2) provided in the peeling unit 12, and the peeling unit 12 is attached to the adhesive roller. As it retreats from the vicinity of 10, the adhesive protective film 2a is peeled off. A perspective view of this state is shown in FIG. The liquid crystal panel 1 is close to the two adhesive rollers 10, and the leading edge of the polarizing plate 2 is also close to the contact portion of the two adhesive rollers 10.

  On the other hand, since the peeling unit 12 moves away from the pressure-sensitive adhesive roller 10 while holding the pressure-sensitive adhesive protective film 2a, the pressure-sensitive adhesive protective film 2a proceeds without being loosened. At this time, since the polarizing plate 2 is pressed by the pressure roller 11, the peeling of the adhesive protective film 2 a is limited to the place of the pressure roller 11, and there is no possibility of peeling off too much.

  Further, when the rotation of the adhesive roller 10 continues and the liquid crystal panel 1 advances, the liquid crystal panel 1 enters between the adhesive rollers 10 as shown in FIG. 3, and the polarizing plate 2 is pressed from both sides. Since the adhesive protective film 2a has been peeled off before this, the adhesive 2b shown in FIG. 6 is exposed on the surface of the polarizing plate 2 facing the liquid crystal panel 1.

  Since the adhesive 2b on the surface of the polarizing plate 2 contacts the liquid crystal panel 1 smoothly and at the same speed as the liquid crystal panel 1, the polarizing plate 2 starts to be attached to the liquid crystal panel 1 without entraining bubbles. On the other hand, the surface of the pressure-sensitive adhesive roller 10 facing the front edge of the scratch-preventing film 2e is a weakly-adhesive portion 10a, so that the liquid crystal is not peeled off by the surface of the pressure-sensitive adhesive roller 10 and is attached to the polarizing plate 2. Integrate with panel 1. The internal structure of the polarizing plate 2 is shown in FIG. Details of FIG. 6 will be described later.

  Thereafter, the adhesive roller 10 continues to rotate at a constant speed, and the liquid crystal panel 1 on which the polarizing plate 2 has been attached is discharged to the rear of the adhesive roller 10. On the other hand, shavings of the polarizing plate 2, sticking residue of the adhesive 2b, dust attached to the surface of the scratch preventing film 2e, and the like may adhere to the surface of the adhesive roller 10. If such foreign matter accumulates, the adhesiveness of the surface of the adhesive roller 10 is hindered, and in the extreme case, the polarizing plate 2 cannot be held smoothly as a protrusion on the surface, which may cause bubbles.

  Therefore, dust suction rollers 13 and 14 are disposed on the back side of the adhesive roller 10. The dust adsorbing roller 13 has an adhesive force stronger than that of the adhesive roller 10, and has a function of peeling off and collecting foreign matter adhering to the surface of the adhesive roller 10. Further, a dust adsorbing roller 14 having a stronger adhesive force is disposed on the back of the dust adsorbing roller 13, and foreign matters and contamination are finally collected on the dust adsorbing roller 14, and the adhesive roller 10 is cleaned. It can be retrieved and used for the next paste.

  The dust adsorbing rollers 13 and 14 are smaller in diameter than the adhesive roller 10 and have a strong adhesive force, and therefore are inferior in wear resistance. Therefore, it is not a good idea to always rotate in contact with the adhesive roller 10. Therefore, a separate clutch mechanism is provided for the dust adsorbing rollers 13 and 14 so that the adhesive roller 10 is cleaned every certain number of productions.

In this embodiment, the operation has been described by giving an example in which a polarizing plate is attached to a liquid crystal panel. However, the present invention can be used in a similar manner as long as the film is attached to an optical display panel having a large area. For example, when a light-reducing film for reducing external light reflection is pasted on the surface of a self-luminous display such as a plasma display panel, a field effect display panel, or an organic EL display panel,
For example, a surface protective film is applied to reinforce a thin display panel such as a liquid crystal panel or an organic EL display panel.

  Here, the characteristic that the film sticking method using this embodiment is less likely to generate bubbles at the start of sticking as compared with the conventional technique with the same purpose will be described in more detail. FIG. 4 is a side view of a main portion showing a state where a polarizing plate is attached in the conventional equivalent purpose technique. As shown in FIG. 4A, the liquid crystal panel 1 is mounted on a stage 101 as a moving means and is held by vacuum suction. The polarizing plate 2 held by the vacuum suction holding stage 102 approaches from the upper left in the drawing so as to come into contact with the attachment start position of the liquid crystal panel 1, and comes into contact with the liquid crystal panel 1 with the adhesive surface side down. In this state, since the polarizing plate does not have a sufficient contact area with the liquid crystal panel 1, in order to advance the polarizing plate 2 in synchronization with the liquid crystal panel 1, it is necessary to push in from the outside.

  Therefore, as shown in FIG. 4B, the vacuum suction stage 102 pushes the polarizing plate 2 from the back even after the polarizing plate 2 contacts. Despite the fact that the leading edge of the polarizing plate 2 has fallen obliquely from the upper left, it suddenly starts horizontal movement, and since it is pushed in while being a film, it cannot maintain a natural cross-sectional shape, Slightly meander.

  Immediately after this, as shown in FIG. 4 (c), the polarizing plate 2 is crushed by the surface rubber 103a of the pressure roller 103, but when the initial meandering is large, the adhesive sticks ahead with waviness. As a result, air is caught in the portion, so that even if it is crushed later, it does not become sufficiently flat, and an elongated bubble is produced. In the prior art, the following measures have been taken to avoid the bubbles.

  In other words, the invasion angle of the polarizing plate 2 is designed to be shallow, the pressing amount of the vacuum suction stage 102 is adjusted to the minimum, and the diameter of the pressure roller 103 is made as small as possible. By these, the room which meanders after the contact start of the polarizing plate 2 was minimized, and it has aimed at elimination of a bubble by pressurizing as quickly as possible. However, as is apparent from FIG. 4, it is extremely difficult in principle to completely avoid the bubble in this method, which has been a difficulty in the on-site adjustment work.

  For comparison with this, FIG. 5 shows a side view, which is a conceptual diagram for explaining the method of the present invention. Actually, both sides are attached together to reduce the equipment floor area. However, for comparison with the prior art, the liquid crystal panel 1 is described as being fixed by vacuum suction on a flat stage. In the present invention, the adhesive roller 10 is used as an adhesive rubber roller having a large diameter as compared with the prior art.

  As shown in FIG. 5A, the liquid crystal panel 1 is mounted and held on the moving means 101 and moves to the right in FIG. 5 at a constant speed. At this time, the adhesive roller 10b having the polarizing plate 2 adhered to the surface in advance is counterclockwise in FIG. 5 so that the front edge of the polarizing plate 2 is close to the attachment position of the liquid crystal panel 1 while synchronizing the peripheral speed with the liquid crystal panel. Turn around. Then, when the polarizing plate 2 and the liquid crystal panel 1 reach the pasting start position, they stop.

  In this state, when the adhesive roller 10 approaches the liquid crystal panel 1 and lands, the polarizing plate 2 comes into contact with the liquid crystal panel 1 as shown in FIG. At this time, since the front edge of the polarizing plate 2 is held by the adhesive rubber layer 10b formed on the surface of the adhesive roller 10, there is no room for meandering. Further, since the polarizing plate 2 starts to be pressed by the adhesive rubber layer 10b immediately after the start of contact, the pressure-sensitive adhesive does not shift without being pressed, and an excessive tension is applied to the contact site by a sudden pressure or an oblique pressing force. There is no twist.

  From this state, the adhesive roller 10 starts to turn and the pasting proceeds. Even if it progresses to the position of FIG. 5C, this situation does not change, and the polarizing plate 2 is sunk into the rubber by the amount of crushed adhesive rubber layer 10b, but the pasting progresses smoothly.

  As described above, since it is possible to realize a pasting method that can eliminate factors that obstruct the pasting of the polarizing plate, such as pressing the polarizing plate 2 in an unsupported state, a sudden change in the moving direction, and a sudden change in the applied pressure, High-speed polarizing plate can be realized without bubbles even in the area.

  Up to this point, it has been shown that bubbles are unlikely to occur when the polarizing plate of this method is attached. Next, after the polarizing plate 2 is attached to the liquid crystal panel 1 by this method, the adhesive roller 10 smoothly moves to the liquid crystal panel 1. Shows the situation where the paste moves.

  First, a basic internal structure of a general polarizing plate 2 is shown in FIG. The polarizing plate body 2c of the polarizing plate 2 is a structure in which a PVA polarizing layer is sandwiched and integrated with a TAC film, and may be considered as an integral plate-like material in normal use. The polarizing plate body 2c is coated with a strong adhesive 2b on the back surface (the surface facing the liquid crystal panel 1), and an adhesive protective film 2a, which is a thin PET film, is used to protect the adhesive 2b. It is pasted.

  The pressure-sensitive adhesive protective film 2a is adjusted so as to exhibit a relatively weak adhesive force with respect to the pressure-sensitive adhesive 2b. On the other hand, a scratch-preventing film 2e having a weak adhesive 2d applied to the back surface is attached to the surface of the polarizing plate body 2c. The scratch-preventing protective film 2e and the adhesive 2d thereof have a relatively strong adhesiveness to the polarizing plate body 2c, but have a property that can be removed without leaving a residue when peeled off before use.

  First, the polarizing plate 2 after peeling off the adhesive protective film 2a is pressed against the liquid crystal panel 1 as described above to generate an adhesive force. Thereafter, the leading edge of the polarizing plate 2 passes through the pressurization region by the surface layer 10 b of the adhesive roller 10 and begins to be separated from the surface of the liquid crystal panel 1 and the adhesive roller 10. This state is shown in FIG.

  Here, a weak adhesive portion 10 a having a weak adhesive force is provided at a position on the front edge of the polarizing plate 2. The adhesive strength of the adhesive rubber 10b to the polarizing plate 2 should originally be weaker than the adhesive strength of the adhesive 2d of the scratch preventing film 2e to the polarizing plate body 2c. For this reason, the adhesive strength of the adhesive rubber 10b is weaker than that described above, and is selected to be an adhesive strength sufficient to hold the polarizing plate 2 in the middle of application. However, the scratch-preventing film 2e is a member that is peeled off and discarded when used by the user, and the adhesive 2d also places an emphasis on cost reduction, and the quality control must be reduced compared to the adhesive 2b of the polarizing plate body 2c. There is a reality that cannot be obtained.

  If the scratch-preventing film 2e is insufficient in adhesive strength, the scratch-preventing film 2e may partially peel as shown in FIG. However, since the weak adhesive part 10a is provided in a part of the adhesive rubber 10b of the adhesive roller 10 and this is applied to the front edge of the polarizing plate 2, the scratch preventing film 2e does not peel off at this part. . Then, even if a part of the scratch preventing film 2e is peeled off, air does not flow into the lower space, so that a negative pressure region 2f is generated and peeling cannot proceed.

  Further, since the negative pressure region 2f does not allow air to enter from the outside, the internal gas is mainly composed of the volatile component of the adhesive 2d, and is naturally exposed to the atmospheric pressure after being applied to the atmospheric pressure after the pasting process. It can be expected that the bubbles are reabsorbed inside 2d and the bubbles disappear.

  Therefore, by providing the weakly adhesive portion 10a at the front edge portion of the polarizing plate 2, it is possible to avoid the scratch prevention film 2e from falling off while avoiding the generation of bubbles in the polarizing plate 2.

  Here, the shape of the weak adhesive portion 10a is not simply a rectangle, and the width of the weak adhesive portion 10a is changed in accordance with the position of the peeling unit 12 so as not to inhibit the peeling of the adhesive protective film 2a. The state is shown in FIG. Actually, since the adhesive roller 10 has a wide width and a large diameter and it is difficult to show the whole, FIG. 8 shows only the vicinity of one peeling unit 12 and the polarizing plate 2 is drawn as an elongated object only in this vicinity.

  The adhesive rubber 10b formed on the cored bar 10c of the adhesive roller 10 has an elongated weak adhesive portion 10a in a part thereof. The polarizing plate 2 is disposed at a position where the front edge of the polarizing plate 2 is applied to the weak adhesive portion 10a, and is adhered and held by the adhesive rubber 10b. On the other hand, in the peeling unit 12, a plurality of rollers 12a hold the adhesive tape 12b in a loop shape with the outside as an adhesive surface, and each roller 12a is fixed to the base plate 12d in a rotatable state.

  Further, a chuck 12 c is provided close to the roller 12 a that faces the front edge of the polarizing plate 2. When the adhesive roller 10 rotates counterclockwise in the drawing while the adhesive tape 12b of the peeling unit 12 is brought into contact with and adhered to the front edge of the polarizing plate 2, the front edge of the polarizing plate 2 passes under the front end roller 12a. Come out from the middle left. At this time, since the adhesive force of the adhesive tape 12b of the peeling unit 12 is stronger than the adhesive force of the adhesive protective film 2a, the adhesive protective film 2a is lifted together with the adhesive tape 12b as the polarizing plate 2 advances. . This state is the state shown in FIG.

  Here, the weak adhesion area 10a has a narrow width in the portion facing the peeling unit 12, and the adhesion holding of the polarizing plate 2 is stronger in this vicinity. For this reason, the holding force of the polarizing plate 2 by the adhesive roller 10 is superior to the adhesive force of the adhesive tape 12b, and there is little possibility that the entire polarizing plate 2 is peeled off from the adhesive roller 10. When the peeling progresses to the state of FIG. 8, the chuck 12c turns counterclockwise, and the adhesive protective film 2a is sandwiched and held between the tip of the chuck 12c and the roller 12a at the tip. Thereafter, the peeling unit 12 is detached from the pressure-sensitive adhesive roller 10 while holding the pressure-sensitive adhesive protective film 2a, so that the peeling proceeds stably.

  In this example, butyl rubber-based adhesive rubber, which has little influence on the process consistency with the liquid crystal sealing process, was selected as the material for the adhesive rubber. Naturally, it is possible to select an adhesive rubber or to use various natural rubbers oriented if quality control is appropriate.

  In the examples so far, as a method of forming the weak adhesion region 10a, a method of processing the fluororesin on the surface layer is exemplified. However, since the fluororesin coat is a process of covering the surface layer of the adhesive rubber in a film shape, There is a risk of losing the effect. Therefore, it is possible to take the following method.

  One is a method of terminating an unsaturated group of an adhesive rubber with a penetrating reactant. In this case, it is possible to react fluorine-based molecules in the termination treatment, and the adhesiveness can be lowered to the inside, so that the wear resistance is improved.

  One is a method of fitting the weak adhesive region 10a as an inlaid process for the adhesive rubber 10b. In this case, it is indispensable that the rubber hardness of the adhesive rubber 10b and the weakly adhesive region 10a is not changed extremely and that the processing is performed so as not to generate unnecessary voids at the seam. Therefore, it can be expected that the stability is increased as compared with a material whose surface adhesiveness is lowered by surface treatment. The weak adhesive region 10a in this state is shown in FIG.

  So far, in order to provide the weak adhesion region 10a, the method of changing at least the material properties of the surface has been disclosed, but the same effect can be obtained even if a rubber of the same quality as the adhesion rubber 10b is used. It is known that the adhesive force is affected by the properties of the adhesive, the material properties of the object, and the true adhesive area. Therefore, it is easy to provide the weak adhesive region 10a by providing fine irregularities on the surface of the adhesive rubber 10b and reducing the adhesive area. In this method, if the unevenness is made fine in order to obtain a weakly adhesive region 10a that is not sufficiently uneven, the unevenness is likely to be lost due to the wear of the adhesive rubber 10b, but it is easy to check regularly and manage on the line. It is. Furthermore, since no special treatment is required, the material price is reduced and the cost can be easily reduced.

  Further, as an alternative modification of this embodiment, since it can be used as the weak adhesive portion 10a if it is finer than the width of the adhesive tape 12b of the peeling unit 12, the width of the adhesive tape is 15 mm at a pitch of 2 mm in the area with respect to the width of 15 mm. There is also a method of providing a recess having a depth of 0.5 mm over the entire width. Details are shown in FIG. An elongated dent 10a1 is disposed in the weak adhesion region 10a. In the figure, only two dents 10a1 are shown on the front side for the sake of simplicity. In this case, since the unevenness becomes a stripe shape, there is little possibility that the adhesive force fluctuates with the progress of the roller, and since the dent is as narrow as 1 mm, there is little trouble in sticking the polarizing plate.

  As a modified example, there is a method in which the entire weakly adhesive region 10a is provided as a shallow dent provided by applying pressure to the adhesive rubber 10a to cause plastic deformation. In this case, the leading edge of the polarizing plate 2 cannot be widely applied to the weakly adhesive region 10a, and it is necessary to use only a region with a narrow boundary, but processing is easy, and even when it becomes shallow due to wear, it is added locally It is also possible to work.

  In the examples so far, the weak adhesive region 10a has always been provided as a region having a low adhesive force. However, when the peeling unit 12 is in use, the adhesive unit 10a is not weakly adhesive and needs to be weakened when the application is completed. There is also a method of weak adhesion only occasionally. FIG. 11 shows the structure. A series of movable pins 10a2 are provided in the weak adhesive region 10a inside the core metal 10c of the adhesive roller. Since the movable pin 10a2 is normally lowered to the lower end, the adhesive rubber 10a becomes flat, and the adhesive rubber 10b Shows similar adhesive properties. In this state, since the holding of the polarizing plate 2 does not cause a particularly weak portion, the operation of the peeling unit 12 is performed smoothly.

  Thereafter, when the pasting process proceeds safely and the front edge of the polarizing plate 2 is finished pressing the liquid crystal panel 1 and is about to be peeled off from the adhesive roller 10, the movable pin 10a2 moves to the upper end, and the weak adhesive region 10a A large number of minute protrusions are generated. As a result, partial push-up of the polarizing plate 2 occurs, and peeling can be supported by reducing the adhesive area.

  In the present embodiment, the adhesive force of the adhesive roller 10 can be partially lowered at any timing, so that there is an advantage that the stability of peeling of the adhesive protective film 2a and the sticking of the polarizing plate 2 can be improved. is there.

  In addition, in the Example so far, although the polarizing plate sticking with respect to a liquid crystal display was used as an example, the same process is a universal process in various flat displays, and is not necessarily a thing limited to polarizing plate sticking. . For example, when applying a light-reducing film used to reduce whiteness due to reflection of external light from a plasma display panel, or adjusting the protective film or chromaticity that protects thin glass on the surface from impact in an organic EL display When attaching a chromaticity adjustment film, optically applied to a flat display, such as when applying an anti-scattering film to prevent glass scattering during a vacuum explosion in a field-effect display, or a dimming film to improve contrast. It can be widely used in the process of applying uniform various functional films.

  The above embodiments have been described along with the attachment of the polarizing plate in the liquid crystal display device. FIG. 12 is a cross-sectional view of the liquid crystal display device. In FIG. 12, a TFT substrate 201 in which pixels having pixel electrodes and thin film transistors (TFTs) are formed in a matrix and a color filter 202 in which a color filter is formed are disposed to face each other, and the TFT substrate 201 and the color filter substrate 202 are arranged. A liquid crystal layer 240 is sandwiched therebetween. The liquid crystal layer 240 is sealed with a sealing material 210. An image is formed by controlling the transmittance of light indicated by an arrow from the backlight by the liquid crystal layer 240 for each pixel.

  Since the liquid crystal can control only polarized light, the light from the backlight is polarized into polarized light by the lower polarizing plate, and after being controlled by the liquid crystal layer 240, it is polarized (analyzed) again by the upper polarizing plate. The image is visually recognized by human eyes.

  Thus, the attaching of the polarizing plate is an important process in the manufacturing process of the liquid crystal display device. By applying the present invention, the yield of the polarizing plate attaching process can be significantly improved, and the manufacturing cost and quality of the liquid crystal display device can be reduced.

  The film attaching method according to the present invention can be applied not only to a liquid crystal display device but also to other display devices. FIG. 13 is a schematic sectional view of a plasma display panel. In FIG. 13, on the front substrate 302, an X electrode and a Y electrode serving as discharge electrodes extend in the first direction. The back substrate 301 is formed with address electrodes extending in a second direction perpendicular to the X or Y electrode. The front substrate 302 and the back substrate 301 are sealed with a sealing material 210. A partition wall 320 is formed on the rear substrate 301, and a discharge space 321 is defined by the partition wall 320 and pixels are defined. An image is formed by causing the phosphor formed for each pixel to emit light by ultraviolet rays generated by the discharge.

  A surface protective plate is formed on the front substrate 302 for the purpose of dimming effect for increasing contrast, chromaticity adjustment, prevention of charging, prevention of leakage of high frequency, and the like. The surface protection plate may be formed of glass or a film. When formed with a film, for example, it is hereinafter referred to as a light-reducing film 330. The light-reducing film 330 is formed of a film body, an adhesive layer for bonding the light-reducing film 330 to the front substrate 302, a protective film for protecting the film from scratches, and the like, similarly to the polarizing plate in the liquid crystal display device. The

  Therefore, the method for adhering the polarizing plate described in Example 1 to Example 4 can be applied to the method for adhering the light reducing film 330 to the front substrate 302 in the plasma display panel.

  FIG. 14 is a schematic cross-sectional view of an organic EL display device. In FIG. 14, on the element substrate 401, pixels formed of an organic EL layer and TFTs are arranged in a matrix. The TFT has a role of switching a signal applied to the organic EL layer. An image is formed by applying a video signal to the organic EL layer for each pixel.

  Since the organic EL layer is deteriorated by moisture, the organic EL layer is protected from moisture by disposing a sealing substrate 402 formed of glass so as to face the element substrate 401. The element substrate 401 and the sealing substrate 402 are sealed with a sealing material 210 at the periphery.

  Since an organic EL layer that emits red, green, and blue is formed for each pixel, in principle, full color display is possible, but the display color may be biased depending on the characteristics of the organic EL layer. In some cases, the white color temperature may be desired. In such a case, the chromaticity adjustment film 430 is formed on the sealing substrate 402 of the organic EL display device. This chromaticity adjusting film 430 is also formed of a main body, an adhesive layer for adhering to the sealing substrate 402, and a protective film for protecting from scratches and the like, similar to the polarizing plate in the liquid crystal display device. is there.

  Therefore, the present invention described in Examples 1 to 4 can be applied to the adhesion of the chromaticity adjusting film 430 in the organic EL display device. FIG. 14 shows a so-called top emission type organic EL display device that extracts light from the organic EL layer from the sealing substrate 402 side. In a bottom emission type organic EL display device that extracts light from the organic EL layer from the element substrate 401 side, the chromaticity adjusting film 430 may be bonded to the element substrate 401 side. Also in this case, the present invention described in the first to fourth embodiments can be applied.

  FIG. 15 is a schematic cross-sectional view of a field effect display panel. In FIG. 15, a cathode substrate 501 in which cathodes are formed in a matrix and an anode substrate 502 in which phosphors are formed corresponding to the cathodes are arranged to face each other with a sealing material 210 interposed therebetween. A space between the cathode substrate 501 and the anode substrate 502 is exhausted to a vacuum through an exhaust pipe 504 attached to the exhaust substrate 503.

  The field effect display panel can display full color, but the light-reducing film 530 may be used to improve contrast. In this case, the dimming film 530 is attached to the anode substrate 502 to cope with it. The dimming 530 in this case is also formed of a main body, an adhesive layer for bonding to the anode substrate 502, and a protective film for protecting from scratches, etc., as with the polarizing plate in the liquid crystal display device. .

  Accordingly, the method of the present invention described in Examples 1 to 4 can also be applied when the dimming film 530 is adhered to the field effect display panel.

  According to the present invention, for example, optical films such as polarizing plates on the front and back of a liquid crystal display can be attached at high speed without generating bubbles, and the manufacturing cost can be reduced, mainly reducing yield loss due to damage. There are advantages you can do.

It is a perspective view explaining operation | movement of the sticking apparatus of this invention. It is a perspective view explaining the operation | movement following FIG. 1 of the sticking apparatus of this invention. It is a perspective view explaining the operation | movement following FIG. 2 of the sticking apparatus of this invention. It is a schematic diagram which shows the bubble generation mechanism in the conventional polarizing plate sticking method. It is a schematic diagram which shows the polarizing plate sticking method of this invention. It is an exploded sectional view showing the internal structure of a general polarizing plate. It is sectional drawing which shows the function of a weak adhesion part. It is a perspective view which shows the relationship between a weak adhesion site | part and a peeling unit. FIG. 6 is a perspective view showing Example 2. 10 is a perspective view showing Example 3. FIG. 10 is a perspective view showing Example 4. FIG. It is sectional drawing of a liquid crystal display device. It is sectional drawing of a plasma display panel. It is sectional drawing of an organic electroluminescence display. It is sectional drawing of a field effect type | mold display panel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal panel, 2 ... Polarizing plate, 10 ... Adhesive roller, 11 ... Pressure roller, 12 ... Peeling unit, 13, 14 ... Cleaning roller, 201 ... TFT Substrate, 202 ... Color filter substrate, 210 ... Sealing material, 240 ... Liquid crystal layer, 301 ... Rear substrate, 302 ... Front substrate, 320 ... Partition, 321 ... Discharge Space, 330 ... Dimming film for plasma display panel, 401 ... Element substrate, 402 ... Sealing substrate, 430 ... Chromaticity adjustment film, 501 ... Cathode substrate, 502 ... Anode Substrate, 503... Exhaust substrate, 504... Exhaust pipe, 530.

Claims (14)

Supply means for supplying an optical film;
Holding means for holding the optical film;
An adhesive surface protective film peeling means for peeling the protective film of the glue surface from the optical film;
An optical film affixing device having a display panel contact means for bringing a display panel into contact with the optical film,
The holding means is composed of a cylindrical member having adhesiveness,
With the rotational movement of the holding means, the position where the optical film is adhesively held, the adhesive surface protective film peeling position of the optical film, and the optical film and the display panel contact position are sequentially arranged in the order that the optical film passes through. An optical film affixing device.   The optical film sticking apparatus according to claim 1, wherein the holding unit has an adhesive force reducing portion in the vicinity of the optical film sticking start position.   3. The optical film sticking apparatus according to claim 2, wherein the adhesive force reducing portion of the holding means is provided with unevenness on the portion of the surface of the cylindrical member having adhesiveness in advance.   The optical film sticking apparatus according to claim 2, wherein the adhesive strength reducing portion of the holding means is formed by inserting a member having low adhesive strength into the portion of the surface of the cylindrical member having adhesiveness in advance. .   The adhesive strength-reducing part of the holding means is formed by forming a low-adhesive film or penetrating a low-adhesive material in advance on the part of the surface of the cylindrical member having adhesiveness. 2. The optical film affixing device according to 2.   3. The optical device according to claim 2, wherein the adhesive force reducing portion of the holding means is formed by providing a movable portion inside the portion of the surface of the cylindrical member having adhesiveness in advance to reduce a contact area. Film pasting device.   In the adhesive force reduction part of the holding means, the adhesive force of the part provided at the position facing the adhesive surface protective film peeling means for peeling the protective film of the glue surface from the optical film on the surface of the cylindrical member, The optical film sticking device according to claim 2, wherein the adhesive strength is higher than the adhesive strength of other portions. An optical film is supplied by a supply means;
While holding the optical film by the holding means,
The adhesive surface protective film is peeled off from the optical film by the adhesive surface protective film peeling means,
Then, while holding the optical film by the holding means, the optical film affixing method to the display panel to contact the optical film to the display panel by the contact means,
Adhering and holding the optical film by a cylindrical member having adhesiveness,
An optical film affixing method to a display panel, wherein an optical film is passed in the order of an adhesive holding position, an adhesive surface protective film peeling position, and a display panel contact position by rotating an adhesive cylindrical member.   9. The optical film is attached by placing a front edge of the optical film in an overlapping manner on an adhesive force reducing portion provided in the vicinity of the attachment start position of the optical member of the cylindrical member. The optical film affixing method to the display panel of description.   The front edge of the optical film is placed on the movable part provided in the vicinity of the optical film pasting start position, and the front edge of the optical film is between the adhesive surface protective film peeling position and the display panel contact position. 10. The method for attaching an optical film to a display panel according to claim 9, wherein, when passing, the movable part is penetrated and adhesion is performed after partially reducing the adhesive force. A liquid crystal display device in which a liquid crystal layer is sandwiched between a TFT substrate on which pixel electrodes and TFTs are formed and a color filter substrate on which color filters are formed, and a polarizing plate is attached to the TFT substrate and the color filter substrate A manufacturing method of
The polarizing plate is supplied from the polarizing plate supply means and then held by an adhesive roller.
The adhesive surface protective film is peeled off from the polarizing plate by the adhesive surface protective film peeling means,
Thereafter, the polarizing plate is brought into contact with the TFT substrate and the color filter substrate by contact means,
Holding the polarizing plate by the adhesive roller, peeling the protective film, moving the polarizing plate to a position where the polarizing plate contacts the TFT substrate and the color filter substrate, rotate the adhesive roller. A method of manufacturing a liquid crystal display device, characterized in that: A method for manufacturing a plasma display panel, in which a discharge space is formed between a front substrate and a back substrate, and an image is formed by causing a phosphor formed in the discharge space to emit light by ultraviolet rays generated by discharge in the discharge space,
A light-reducing film is attached to the front substrate,
The light-reducing film is supplied from the light-reducing film supply means and then held by an adhesive roller.
The adhesive surface protective film is peeled off from the light-reducing film by the adhesive surface protective film peeling means,
Thereafter, the light-reducing film is brought into contact with the front substrate by contact means,
The light-reducing film is moved to the position where the light-reducing film is held by the adhesive roller, the protective film is peeled off, and the light-reducing film is brought into contact with the front substrate by rotating the pressure-sensitive adhesive roller. A method of manufacturing a plasma display panel. An organic EL display device manufacturing method in which an element substrate on which an organic EL element and a TFT are formed is sealed with a sealing substrate,
A chromaticity adjustment film is attached to the sealing substrate,
The chromaticity adjustment film is supplied from the chromaticity adjustment film supply means and then held by an adhesive roller.
The adhesive surface protective film is peeled off from the chromaticity adjusting film by the adhesive surface protective film peeling means,
Thereafter, the chromaticity adjusting film is brought into contact with the sealing substrate by a contact means,
The holding position of the chromaticity adjusting film by the adhesive roller, the peeling position of the protective film, and the movement of the chromaticity adjusting film to a position where the chromaticity adjusting film contacts the front substrate rotate the adhesive roller. The manufacturing method of the organic electroluminescent display device characterized by the above-mentioned. A method of manufacturing a field effect display panel in which a cathode substrate on which cathodes arranged in a matrix are formed and an anode substrate on which a phosphor is formed corresponding to the cathode are opposed to each other, and the inside is evacuated.
A light-reducing film is attached to the anode substrate,
The light-reducing film is supplied from the light-reducing film supply means and then held by an adhesive roller.
The adhesive surface protective film is peeled off from the light-reducing film by the adhesive surface protective film peeling means,
Thereafter, the light-reducing film is brought into contact with the anode substrate by contact means,
The light-reducing film is moved to the position where the light-reducing film is held by the adhesive roller, the protective film is peeled off, and the light-reducing film is brought into contact with the front substrate by rotating the pressure-sensitive adhesive roller. A method of manufacturing a field effect display panel.

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