CN207780408U - Film sticker - Google Patents

Abstract

The utility model provides a film sticking device, which sticks a film (20) to a display panel (10), and has a first workbench (600) for holding the display panel (10) and a second workbench for holding the film (20). stage (700), the second worktable (700) can slide on the surface of the film (20), and the display panel (10 ) is in pressure contact with the film (20), and the part where the roller (800) is initially in pressure contact with the display panel (10) and the film (20) is located at a position other than the ends of the display panel (10) and the film (20). After the roller (800) moves toward the end of the display panel (10) or the film (20) while pressing, the roller (800) is moved in the opposite direction to bond the display panel (10) and the film (20). With this film sticking device, it is possible to accurately bond the display panel and the film.

Description

Film sticking device

technical field

The utility model particularly relates to a method and a film pasting device for pasting a film on a display device or the like.

Background technique

Organic EL display devices and liquid crystal display devices are formed by bonding films such as polarizers, support substrates, and touch panels to a display panel. In this case, it is important to align the positions of the display panel and the polarizer. Patent Documents 1 and 2 describe methods and devices for accurately aligning a display panel with a film to be bonded.

On the other hand, if air bubbles are introduced during bonding, this part will become a screen defect, so it is important not to introduce air bubbles during bonding. Similarly, if the film is wrinkled at the time of pasting, the display area becomes defective. Patent Documents 3 and 4 describe a film sticking method and a sticking device for countermeasures against air bubbles and wrinkles.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2003-276091

Patent Document 2: Japanese Patent Laid-Open No. 2013-186315

Patent Document 3: Japanese Patent Laid-Open No. 2004-358856

Patent Document 4: Japanese Patent Laid-Open No. 2005-321582

Technical problems to be solved by utility models

In the case of sticking the film on the display panel, the position of the display panel and the film is usually aligned using alignment marks, and the display panel or the end of the film is pasted with a roller.

However, even if the display panel and the film are aligned, there is a problem that the film and the display panel to be bonded in the traveling direction of the roller are displaced from each other when the film is pasted by the roller. In addition, as the film shifts in the traveling direction of the roller, a phenomenon in which the display panel also shifts occurs.

When the film is pasted on the display panel, for example, it is vacuum-adsorbed by a panel suction table. In this case, if the display panel is shifted relative to the panel suction table, there will be a problem that the display panel will be detached from the panel suction table.

Utility model content

The utility model solves the above-mentioned problems, and realizes a bonding method and a bonding device for bonding a film to a display panel with high precision.

Technical means used to solve problems

The utility model overcomes the problems referred to above, and the representative technical means are as follows.

(1) A film sticking device for bonding a film to a display panel, comprising: a first workbench holding the above-mentioned display panel; slide on the surface of the film, and the above-mentioned film sticking device further includes: a mechanism for pressing the above-mentioned film and the above-mentioned display panel by using a roller on the part of the above-mentioned film that does not overlap with the above-mentioned second workbench; a mechanism in which the portion of the panel and the above-mentioned film is provided at a position other than the end of the above-mentioned display panel and the above-mentioned film; A mechanism that moves to the ends of the display panel and the film, and after the rollers press-contact the ends of the display panel and the film, moves the rollers in the opposite direction to bond the display panel and the film.

(2) The film sticking apparatus as described in (1) which has the mechanism which sets the distance of the position where the said roller and the said film contact first, and the edge part of the said film to more than the radius of the said roller.

According to the present invention, the film can be attached to the display panel with high precision.

Description of drawings

FIG. 1 is a plan view of an organic EL display device.

Fig. 2 is an A-A sectional view of Fig. 1 .

3 is a plan view of a liquid crystal display device.

Fig. 4 is a B-B sectional view of Fig. 3 .

Fig. 5 is a plan view showing a main substrate.

Fig. 6 is a cross-sectional view showing a state where a film is attached to a main substrate.

Fig. 7 is a cross-sectional view showing a conventional example of a sticking device.

Fig. 8 is a cross-sectional view showing details of a conventional example of the pasting device.

Fig. 9 is a cross-sectional view showing the sticking device of the present invention.

Fig. 10 is a cross-sectional view showing details of the sticking device of the present invention.

Fig. 11 is a cross-sectional view showing other details of the sticking device of the present invention.

Fig. 12 is a cross-sectional view showing yet another detail of the sticking device of the present invention.

Explanation of reference signs

10...Main substrate, 11...Organic EL unit, 12...Separation line, 20...Film, 50...Support substrate, 60...Display area, 100...TFT substrate, 101...Lower polarizer, 110...Array layer, 120...Organic EL layer, 130...protective layer, 150...terminal part, 160...seal, 170...flexible wiring board, 200...counter substrate, 201...upper polarizer, 300...liquid crystal, 400...anti-reflection polarizer, 500...backlight source, 600...panel suction table, 601...suction hole, 610...stopper, 700...slide table, 800...roller.

Detailed ways

Below, the content of this invention is demonstrated in detail using an Example.

(Example 1)

FIG. 1 is a plan view showing an example of an organic EL display device to which the present invention is applied, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 . 1 and 2, an array layer 110 comprising TFT (Thin Fim Transistor, thin film transistor) and wiring is formed on a flexible substrate 100, an organic EL layer 120 comprising a light-emitting layer is formed thereon, and a covering organic EL layer is formed. 120 of protective layer 130 .

In the organic EL display device, a reflective film is formed in the display region 60 to improve the utilization efficiency of light from the organic EL layer 120 . In order to prevent the screen from becoming difficult to see due to external light reflected by the reflective film, the anti-reflection polarizer 400 is attached to the protective layer 130 . In the TFT substrate 100, the portion where the polarizer 400 is not attached serves as a terminal portion 150, and is connected to a flexible wiring board 170 that supplies power and signals to the organic EL display device.

Since the TFT substrate 100 of the organic EL display device is formed of a thin polyimide substrate or the like, the strength of the display device may not be sufficient. In addition, when the organic EL display device is bent, plastic deformation may occur. In order to prevent this, a support substrate 50 is pasted under the TFT substrate 100 .

FIG. 3 is a plan view showing an example of a liquid crystal display device to which the present invention is applied, and FIG. 4 is a B-B sectional view of FIG. 3 . In FIGS. 3 and 4 , the TFT substrate 100 on which the TFTs and pixel electrodes are formed is bonded to the counter substrate 200 using the sealant 160 formed on the periphery. A display area 60 is formed in an area surrounded by the sealing material 160 . Liquid crystal is interposed between the TFT substrate 100 and the counter substrate 200 .

A lower polarizer 101 is pasted under the TFT substrate 100 , and an upper polarizer 201 is pasted on the opposite substrate 200 . A single part of the TFT substrate 100 is a terminal portion 150, which is connected to a flexible wiring board 170 that supplies power and signals to the liquid crystal display device. The liquid crystal display panel does not emit light by itself, so a backlight 500 is arranged on the back of the liquid crystal display panel.

In this way, various films represented by polarizers are attached to both organic EL display devices and liquid crystal display devices. Organic EL display devices and liquid crystal display devices are inefficient if manufactured one by one, so a large number of organic EL units or liquid crystal units are formed on a main substrate, and each organic EL unit or liquid crystal unit is separated after the main substrate is completed.

Hereinafter, an organic EL display device will be described as an example. FIG. 5 is a plan view showing the main substrate 10 . The size of the main substrate 10 is, for example, 680 mm×880 mm. In FIG. 5 , 7×5=35 organic EL units 11 are formed on the main substrate 10 . After the main substrate 10 is completed, it is separated into individual organic EL units 11 along separation lines 12 by laser cutting or the like.

Organic EL display devices are often used as flexible display devices, so the TFT substrate 100 is formed of a polyimide substrate or the like, and has a thickness of approximately 10 μm to 20 μm. Since rigidity is insufficient with such a substrate thickness, the film 20 is pasted under the main substrate 10 during the manufacturing process.

FIG. 6 is a cross-sectional view showing this state. In FIG. 6 , organic EL units 11 are formed on a main substrate 10 formed of a polyimide substrate. After the main substrate 10 is completed, the organic EL units 11 are separated into individual organic EL units 11 by dicing with separation lines 12 shown by dotted lines. Since such a main substrate 10 is thin, its rigidity is low, and the manufacturing process cannot be performed. Therefore, the film 20 made of resin is generally pasted.

As shown in FIG. 6 , the film 20 is attached to the main substrate 10 and therefore has a large size. Therefore, air bubbles are easily taken in, and the pressure of the roller when pasting with a roller is also large.

Fig. 7 is a cross-sectional view showing a conventional pasting device. In (a) of FIG. 7 , the main substrate 10 is held on the panel suction table 600 by vacuum suction. Here, when the main substrate 10 is held on the panel suction table 600 , the main substrate 10 is held with the panel suction table 600 as the lower side in order to improve operability. Then, after the main substrate 10 is fixed to the panel suction table 600 by vacuum suction, the panel suction table 600 is reversed so that the main substrate 10 is on the lower side.

In (a) of FIG. 7 , the film 20 is held on a slide table 700 . Suction holes are formed in the slide table 700, and the held film 20 is fixed to the slide table 700 by vacuum suction. The film 20 fixed on the slide table 700 is moved to a predetermined position, and is aligned with the main substrate 10 held on the panel suction table 600 using an alignment mark and a camera.

As shown in FIG. 7( b ), after the main substrate 10 and the film 20 are aligned, the film 20 is pressed against the main substrate 10 with a roller 800 and pasted together. The roller 800 advances in the direction of the hollow arrow while rotating, so that the film 20 and the main substrate 10 are bonded together. The slide table 700 is also moved corresponding to the travel of the roller 800 so that the film 20 can be bonded to the main substrate 10 .

The slide table 700 absorbs and fixes the film 20 by vacuum suction until it moves to a predetermined position, but the vacuum suction is released when the film 20 is bonded by the roller 800 , and the slide table 700 can slide on the film 20 . Therefore, both the main substrate 10 and the film 20 are supported by the vacuum suction of the panel suction stage 600 during the bonding of the film 20 to the main substrate 10 using the roller 800 .

Fig. 8 is a cross-sectional view showing a problem of the bonding method shown in Fig. 7 . In FIG. 8 , the main substrate 10 is fixed to the panel suction table 600 by vacuum suction. That is, the main substrate 10 is vacuum-suctioned from the suction hole 601 of the panel suction table 600 as indicated by arrow ab, and fixed to the panel suction table 600 .

In FIG. 8 , the roller 800 comes into contact with the main substrate 10 and the ends of the film 20 , and then adheres the film 20 to the main substrate 10 while moving in the direction of the hollow arrow. However, the pressure is greatest when the roller 800 initially contacts the membrane 20 . Then, the film 20 moves in the direction of the hollow arrow from the end of the film 20 , so that the film 20 generates an offset stress as shown by the arrow f1 with respect to the main substrate 10 . Therefore, an offset occurs between the main substrate 10 and the film 20 . Therefore, it is difficult to accurately bond the main substrate and the film.

Another problem with the conventional bonding method is that when the roller 800 contacts the end of the film 20 and moves in the direction of the hollow arrow, the main substrate 10 is also given an offset stress as shown by the arrow f2, thereby , sometimes the main substrate will move in the direction of the arrow f2. That is, when the roller 800 is initially in contact with the film 20 , the maximum offset stress in the plane direction is applied on the film 20 and the main substrate 10 . Then, the main substrate 10 is displaced from the suction hole, the main substrate 10 is not fixed to the panel suction table 600 , the main substrate 10 is bent, or the main substrate 10 may fall from the panel suction table 600 in some cases.

The pasting device of the present utility model is used to solve the above problems. Fig. 9 is a diagram showing a sticking device and steps of the present invention. In (a) of FIG. 9 , the main substrate 10 is held on the panel suction stage 600 by vacuum suction. When the main substrate 100 is held on the panel suction table 600 , the main substrate 10 is held with the panel suction table 600 on the lower side in order to improve operability. Also, after the main substrate 10 is fixed to the panel suction table 600 by vacuum suction, the panel suction table 600 is reversed so that the main substrate is on the lower side, which is the same as in the conventional art. In (a) of FIG. 9 , a protruding stopper 610 is formed at the front end of the panel suction table 600 .

In (a) of FIG. 9 , the film 20 is held on the slide table 700 . Suction holes are formed in the slide table 700, and the held film 20 is fixed to the slide table 700 by vacuum suction. The film 20 fixed on the slide table 700 is moved to a predetermined position, and is aligned with the main substrate 10 held on the panel suction table 600 using an alignment mark and a camera.

The main difference between the present invention and the conventional example is that the first contact point of the roller 800 with the film 20 is not the end of the film 20 , but the inner side of the end. The details are shown in FIG. 10 . In FIG. 10 , the roller 800 moves in the direction of the arrow, and presses the film 20 against the main substrate 10 . The portion where the roller 800 first comes into contact with the film 20 is not the end of the film 20 .

Therefore, as shown in FIG. 10 , when the roller 800 comes into contact with the film, the slide table 700 has retreated, and the portion of the film 20 not covered by the slide table is the region b2. On the other hand, in FIG. 8 which shows a conventional example, the part of the film 20 which is not covered by the slide table 700 is area|region b1, and b2>b1. In b1 of FIG. 8 , it is only necessary to have a distance not in contact with the slide table 700. On the other hand, in b2 of FIG. 20 the distance the tip moves.

The main difference between FIG. 10 and FIG. 8 is that the center of the roller 800 is located inside the end of the main substrate 10 or the film 20 in plan view. That is, from the end of the main substrate 10 to the center of the roller 800 is d2 in the inner direction of the main substrate 10 . On the other hand, in FIG. 8 , the center of the roller 800 is located on or outside the end of the main substrate 10 by a distance d1 from the end of the main substrate 10 . This is because, in FIG. 8 , the bonding starts from the end of the film 20 and the end of the main substrate 10 .

Returning to FIG. 9( a ), FIG. 9( a ) shows a state where the roller 800 presses the film 20 toward the main substrate 10 side. Since the film 20 is thin, it bends on the roller 800 side. The characteristic point of FIG. 9 is that when the roller 800 comes into contact with the film 20 initially, the film 20 is pressed in a direction perpendicular to the plane of the main substrate 10 as indicated by the dotted arrow in FIG. 9( a ). That is, when the film 20 is in contact with the main substrate 10 , no force in the plane direction acts on the film 20 or the main substrate 10 , and only force in a direction perpendicular to the plane of the main substrate 10 or the film 20 acts.

Therefore, since there is no force for shifting the film 20 in the planar direction to the main substrate 10 , it is possible to avoid shifting of the main substrate 10 and the film 20 due to pasting. And, since there is no force to deviate the main substrate 10 in the planar direction, there is no force in the direction to deviate the main substrate 10 relative to the panel suction table 600, so the main substrate 10 will not be released from the panel suction table 600. The suction hole 601 of 600 is offset.

As shown in FIG. 9( a ), after the roller 800 presses the film 20 in a direction perpendicular to the main substrate 10 , it temporarily moves toward the end of the main substrate 10 as indicated by the hollow arrow. This is for bonding the end of the main substrate 10 to the end of the film 20 . Next, the roller 800 rotates and presses the film 20 against the main substrate 10 . However, the main substrate 10 and the film 20 are already bonded at this time, so the main substrate 10 and the film 20 do not deviate from each other.

In addition, since the roller 800 sticks the film 20 while pressing the film 20 against the main substrate 10 , the main substrate 10 is not displaced in the planar direction from the panel suction table 600 . In the conventional example, when the roller 800 is first brought into contact with the end of the film 20 or the end of the main substrate 10, force is also applied to the main substrate 10 in the planar direction, so the main substrate 10 is shifted from the panel adsorption stage 600. probability increases. In contrast, in the present invention, there is no planar force when the roller 800 first contacts the film 20 or the main substrate 10 , so the main substrate 10 will not be displaced from the panel adsorption table 600 in the planar direction.

Thereafter, as shown in FIG. 9( b ), the roller 800 moves to the end of the film 20 and the main substrate 10 , and after bonding the film 20 and the end of the main substrate 10 , rotates to the opposite side. Thereafter, as shown in FIG. 9( c ), the film 20 is bonded to the main substrate 10 while moving the slide table 700 . The process is the same as the prior art. At this time, the angle θ between the panel suction table 600 and the slide table 700 is 5 degrees to 10 degrees. This is for removing air bubbles when the film 20 is press-bonded by the roller 800 .

FIG. 11 is a cross-sectional view showing a state when the roller 800 is first brought into contact with the film 20 or the main substrate 10 . In FIG. 11 , d2 is the distance from the point where the roller 800 initially contacts the main substrate 10 to the end of the main substrate 10 . In the present invention, the roller 800 needs to temporarily move to the end of the main substrate 10 after initially contacting the main substrate 10, so a distance for this is required, which is d2. d2 is preferably equal to or greater than the radius of the roller 800 . When d2 is too large, as will be described later, the deflection of the film 20 increases, so d2 is preferably equal to or less than the diameter of the roller 800 .

In the present invention, when the film 20 is first brought into contact with the main substrate 10 by the roller 800 , it is necessary to have a large area where the film 20 is not supported by the slide table 700 . Membrane 20 is generally thin so would deflect if slide table 700 were not present. When the deflection becomes large, the accuracy of aligning the end of the film 20 with the end of the main substrate 10 deteriorates.

That is, when the ends of the main substrate 10 and the film 20 are detected by the camera, it is difficult to detect by the camera if the end of the main substrate 10 and the end of the film 20 are far apart. This is because the position alignment of the edge part of the main board|substrate 10 and the edge part of the film 20 needs to be performed beforehand also in this invention before the sticking operation of a roll. In addition, it is necessary to detect, for example, whether the roller 800 has moved to the end of the main substrate 10 or the film 20, but when detecting it with a camera or the like, if the end of the main substrate 10 is far from the end of the film 20, it is difficult to detect. Check with a camera.

As shown in FIG. 11 , even if the film 20 is bent, as long as the front end of the film 20 exists on the upper side than the center of the roller 800, that is, on the side of the main substrate 10, the end of the main substrate 10 and the end of the film 20 can be detected by a camera. The detection does not cause major problems. In addition, when the radius of the roller is r, 1/4 of the circumference is πr/2. That is, even when the film 20 is very easily deflected to follow the outer circumference of the roller 800, the distance from the center of the roller 800 to the end of the film 20 may be πr/2. However, in practice, the film 20 does not bend to such an extent, and there is no problem as long as the distance from the center of the roller 800 to the end of the film is at most the diameter of the roller 800 in the worst case.

FIG. 12 is a cross-sectional view showing a state where the roller 800 has come to the end of the main substrate 10 or the film 20 . In FIG. 12 , the center of the roller 800 coincides with the end of the main substrate 10 or the film 20 in plan view. Near the end of the main substrate 10 or the film 20, the main substrate 10 and the film 20 have been bonded together. A stopper 610 is formed at the front end of the panel suction stand 600 in FIG. 12 . Depending on the situation, the stopper 610 can be used as an alignment guide for the main substrate 10 and the film 20 . In this case, the height t1 of the stopper 610 is preferably greater than or equal to the thickness t2 of the total thickness of the main substrate 10 and the film 20 .

In addition, in FIG. 12 , the stopper 610 is not used as a guide for aligning the main substrate 10 with the film 20 . In FIG. 12 , before bonding the main substrate 10 and the film 20 , the ends of the main substrate 10 and the film 20 are aligned with a camera or the like. In this case, the stopper 610 leaves a gap of Δx from the end of the main substrate 10 or the film 20 . This is to secure a movement margin between the stopper 610 and the main substrate 10 or the film 20 when aligning the main substrate 10 and the film 20 .

As described above, according to the present invention, the bonding of the film 20 and the main substrate 10 can be performed with high precision and high yield.

In the above description, the bonding between the main substrate and the film has been mainly described, but the present invention is not limited thereto, and can also be applied to other bonding, such as bonding between a polarizer and a display device, and between a supporting substrate and a display device. bonding etc.

Claims (8)

1. A film bonding device for bonding a film to a display panel, characterized in that it has: a first table holding the display panel; and a second bench holding the membrane, said second table is capable of sliding on the surface of said membrane, The film sticking device further has a roller located on the opposite side of the film to the display panel, and the roller is configured to be able to hold the film on a portion of the film that does not overlap with the second table. crimped with the display panel, The portion where the roller initially press-contacts the display panel and the film is provided at a portion other than the ends of the display panel and the film, The roller moves toward the end of the display panel and the film while crimping the display panel or the film after initially crimping the display panel or the film. The ends of the display panel and the film are then reversed to bond the display panel and the film. 2. The film sticking device according to claim 1, characterized in that: The distance between the position where the roller and the film first contact and the edge of the film is equal to or greater than the radius of the roller. 3. The film sticking device according to claim 1, characterized in that: The distance between the position where the roller and the film first contact and the end of the film is equal to or less than the diameter of the roller. 4. The film sticking device according to claim 1, characterized in that: A distance between the end of the display panel and the end of the film when the roller initially bonds the film and the display panel is equal to or less than a radius of the roller. 5. The film sticking device according to claim 1, characterized in that: The first table has a convex portion near the end portion of the display panel and the end portion of the film, and the height of the convex portion is equal to or greater than the sum of the thicknesses of the display panel and the film. . 6. The film sticking device according to any one of claims 1 to 5, characterized in that: The second table moves corresponding to the movement of the rollers. 7. The film sticking device according to any one of claims 1 to 5, characterized in that: The first workbench holds the display panel by vacuum suction. 8. The film sticking device according to any one of claims 1 to 5, characterized in that: A detection mechanism is provided to detect whether the roller is in contact with the film or the end of the display panel.