KR101649083B1 - Continuous production method for producing optical display panel and continuous production system for producing optical display panel - Google Patents

Abstract

The present invention provides a continuous manufacturing method of an optical display panel and a system for stably achieving high junction accuracy when an optical film is bonded to an optical cell. This method comprises the steps of transporting a carrier film 12 in which an optical film 13 is laminated via a pressure-sensitive adhesive, and a step of folding the carrier film 12 carried inward to form an optical film 13 , Peeling the optical film (13) with the adhesive, transporting the optical cell (P), joining the optical film (13) peeled off from the carrier film (12) to the optical cell (P) via an adhesive, and peeling The carrier film 12 is peeled off until the front end of the optical film 13 reaches the feeding position 61 ahead of the detection position 62 for alignment and then the front end portion of the optical film 13 is moved to the detection position 62 ). ≪ / RTI >

Description

TECHNICAL FIELD [0001] The present invention relates to a continuous manufacturing method of an optical display panel and a continuous manufacturing system of an optical display panel,

The present invention relates to a continuous manufacturing method of an optical display panel and a continuous manufacturing system of an optical display panel in which an optical display panel is formed by bonding an optical film peeled off from a carrier film to an optical cell via a pressure sensitive adhesive.

As a method of bonding an optical film such as a polarizing film to an optical cell via a pressure-sensitive adhesive, the following methods are known. The optical film is folded on the carrier film with the carrier film inward at the front end portion of the peeling portion in a state in which the optical film is formed with the pressure-sensitive adhesive interposed therebetween. Thereby, the optical film is peeled together with the adhesive agent from the carrier film. Then, the peeled optical film is bonded to the optical cell via the adhesive.

Here, when bonding the optical film to the target position of the optical cell, it is important to perform alignment. As a position alignment method, the following methods have been disclosed (see Patent Document 1).

In the method described in Patent Document 1, first, the edge portion of the front end portion of the optical film supplied to the bonding position is confirmed by the peeling portion using the edge inspection apparatus, and the peeling portion detects the edge portion of the optical film fed in the conveying direction and the transverse direction (X, y, &thetas;). Then, based on the calculated data, the optical cell is turned by θ and aligned and then sent to the bonding position, and the bonding is performed while peeling the optical film from the carrier film in the peeling section.

Japanese Patent No. 4377964 Specification

However, in recent years, optical display panels such as liquid crystal display panels are becoming smaller, thinner, and lighter, and along with this, miniaturization around the display area, so-called narrowing of the frame width, is progressing. In order to realize narrowing of the frame width, a higher precision is required for bonding of the optical cell and the optical film.

However, according to the conventional continuous manufacturing method of an optical display panel, there is a possibility that such higher junction accuracy can not be satisfied.

In the conventional method, the position of the front end portion of the optical film is detected when the front end portion of the optical film exists on the peeling portion. After the position of the optical cell is corrected based on the position information, the front end of the optical film and the front end of the optical cell are transported to the bonding position, respectively.

In the optical film in this conveying process, the conveying amount fluctuates due to the force to be exerted on the film at the time of peeling or the tensile force at the time of conveyance. Further, in the optical cell, the amount of conveyance also varies due to slippage between the optical cell and the conveying roller at the time of conveyance. Therefore, when the front end portion of the optical film and the front end portion of the optical cell have reached the joining position, one or both positions may deviate from a target originally intended position. At this time, when the optical film and the optical cell are bonded, a displacement occurs. At present, it is difficult to precisely adjust the conveyance amount of these, and therefore, it is difficult to achieve the above-mentioned high level of joining accuracy in the conventional method.

Therefore, in order to realize a high bonding accuracy, it is preferable that the alignment of the optical film and the optical cell is performed as close as possible to the bonding position. For example, a method of detecting the front end portion of the optical film at the front end of the peeling portion is conceivable. However, even when this method is used, it is found that there are the following problems.

At the tip of the peeling section, the optical film is peeled off from the carrier film. The optical film may be deformed by the adhesive force of the pressure-sensitive adhesive at the R portion of the front end portion of the peeling portion at the time of peeling. In order to suppress the fluctuation of the peeling point, the feeding operation of the front end portion of the optical film is usually performed for each bonding. However, the deformation state of the optical film at the peeling section tip differs from one junction to another. As a result, the position of the front end portion of the optical film is varied for each feeding, and the focus of the camera is shifted, so that alignment can not be performed accurately. This point will be described with reference to Figs. 5A to 5C.

5A, 5B, and 5C schematically show a step of peeling an optical film together with a pressure-sensitive adhesive from a carrier film. 5C is a schematic enlarged view of the vicinity of the tip end 40a of the peeling section 40 of FIG. 5B.

The optical film 13 is composed of an optical film main body 13a and a pressure sensitive adhesive 13b and is laminated on the carrier film 12. [ The optical film 13 formed on the carrier film 12 moves in the D1 direction along the surface of the peeling section 40 by winding the carrier film 12 by the winding section 60. [ The peeling section 40 has a thin distal end portion 40a and the optical film 13 is peeled from the carrier film 12 together with the adhesive. The optical film 13 is bonded to the optical cell P which has moved in the direction D2 on the panel line PL.

When the optical film 13 is fed as shown in Fig. 5B, the feeding angle of the optical film 13 varies at the tip end 40a of the peeling section 40 (13, 13x, 13y). This means that deviations occur in the position of the optical film 13 with respect to the carrying direction D2 of the optical panel P (delta 1, delta 2). This deviation is considered to be caused by deformation of the optical film main body 13a due to the adhesive force F of the pressure-sensitive adhesive 13b as shown in Fig. 5C.

As described above, since the position of the leading end portion of the fed optical film 13 is changed, time is required for alignment for bonding to the optical cell P. In addition, deviation of the camera focus for detecting the position of the front end portion of the optical film 13 occurs, and the alignment accuracy is deteriorated. This suggests that a high bonding accuracy can not be obtained stably.

In view of the above problems, it is an object of the present invention to provide a continuous manufacturing method of an optical display panel and a system thereof, which can stably realize a high bonding accuracy when bonding an optical film to an optical cell.

According to another aspect of the present invention, there is provided a method of continuously manufacturing an optical display panel,

A step of transporting a carrier film on which an optical film is laminated via an adhesive,

Folding the conveyed carrier film inward, peeling the optical film from the carrier film together with the pressure-sensitive adhesive,

A step of returning the front end of the optical film to the detection position after peeling the carrier film until the front end of the optical film reaches the feeding position ahead of the detection position for alignment by the peeling process;

Detecting a front end portion of the optical film at the detection position and performing alignment of the optical film based on the detection result,

And bonding the optical film after the alignment to the optical cell to be transported via the pressure-sensitive adhesive.

According to the present invention, the front end of the optical film is fed until reaching the feeding position ahead of the detection position, and once forcibly peeled from the carrier film with respect to the feeding portion, the front end portion of the optical film is returned to the detection position . As a result, the optical film is peeled from the carrier film at almost the same position in the feeding operation, and is then set at the detection position. Therefore, the peeling position is not changed in each bonding operation.

Therefore, the positional deviation due to the deformation of the optical film resulting from the adhesive force of the pressure-sensitive adhesive is alleviated. Therefore, according to the present method, the alignment time for bonding is shortened and the accuracy is greatly improved.

The step of returning the front end portion of the optical film to the detection position may be carried out once or plural times in order to reverse the conveying direction of the carrier film.

In the above method, it is preferable that, after the front end of the optical film is returned to the detection position, the optical film peeled off from the carrier film is bonded to the optical cell at the detection position. Thus, high joining accuracy can be stably realized.

Further, in the continuous manufacturing system of the optical display panel of the present invention,

A carrier film conveying section for conveying a carrier film in which an optical film containing a pressure sensitive adhesive is laminated via the pressure sensitive adhesive,

A peeling section for folding the carrier film conveyed by the carrier film conveying section inward from the folding section and peeling the optical film from the carrier film;

An optical cell conveyance section for conveying the optical cell,

A bonding portion joining the optical film peeled off from the carrier film in the peeling section to the optical cell carried by the optical cell carrier section via the adhesive,

And a drive control section capable of controlling the conveying direction of the carrier film,

The drive control section performs control to return the front end portion of the optical film to the detection position at the stage where the front end of the optical film reaches the feeding position ahead of the detection position for alignment,

The junction is characterized in that after the front end portion of the optical film is returned to the detection position, the optical film aligned at the detection position is bonded to the optical cell.

With this system, the positional deviation caused by the deformation of the optical film resulting from the adhesive force of the pressure-sensitive adhesive is alleviated, the alignment time for bonding is shortened, and the precision is greatly improved.

In addition to the above-described configuration, the present system further comprises a drive roller for transporting the carrier film on which the optical film is laminated, toward the peeling section, on the upstream side of the folding section,

And the drive control unit performs control to invert the transport direction of the carrier film to return the front end of the optical film to the detection position by performing control to invert the rotational direction of the drive roller.

Further, in addition to the above-described configuration, the optical film peeled from the carrier film may be bonded to the optical cell at the detection position.

According to the constitution of the present invention, the position shift due to the deformation of the optical film resulting from the adhesive force of the pressure-sensitive adhesive is alleviated, the alignment time for bonding is shortened, and the precision is greatly improved.

1 is a schematic diagram showing an embodiment of a continuous manufacturing system of an optical display panel.
2A is a schematic view showing a step of peeling an optical film together with a pressure-sensitive adhesive from a carrier film.
2B is a schematic view showing a step of peeling the optical film from the carrier film together with the adhesive.
2C is a schematic diagram showing a step of peeling the optical film together with the adhesive from the carrier film.
3 is a schematic diagram for explaining an experimental method of the embodiment.
FIG. 4A is a diagram showing an experimental result. FIG.
And Fig. 4B is a view showing the result of the experiment.
5A is a schematic view showing a step of peeling the optical film from the carrier film together with the adhesive.
5B is a schematic diagram showing a step of peeling the optical film from the carrier film together with the adhesive.
5C is a schematic diagram showing a step of peeling the optical film from the carrier film together with the adhesive.

An embodiment of a continuous manufacturing method of an optical display panel and an optical display panel continuous manufacturing system according to the present invention will be described with reference to the drawings. Hereinafter, it is abbreviated as "this method" and "this system" as appropriate.

[Overall configuration of system]

1 is a schematic diagram of a first embodiment of the present system. The system 100 includes a carrier film transport section 101, a peeling section 40, a first optical cell transport section 102, a bonding section 103, a second optical cell transport section 104 and a drive control section 110, And the like.

The carrier film carrying section 101 carries a laminated optical film 11 in which an optical film 13 including a pressure sensitive adhesive is laminated on the carrier film 12. [ The first optical cell conveying section 102 conveys the optical cell P. The peeling section (40) peels the optical film (13) containing the adhesive from the laminated optical film (11). The joining portion 103 joins the optical film 13 on one side of the optical cell P conveyed from the first optical cell conveying portion 102 via an adhesive. The second optical cell conveying section 104 further conveys the optical cell P to which the optical film 13 is bonded on one surface to the downstream side.

Although not shown in Fig. 1, the configuration of the apparatus on the downstream side of the second optical cell conveying unit 104 is omitted. In the present system 100, the optical film 13 is bonded to both surfaces of the optical cell P to manufacture an optical display panel Or the like. In this case, the present system 100 further includes another carrier film conveying portion, a joining portion, a peeling portion, and an optical display panel conveying portion on the downstream side of the second optical cell conveying portion 104. Hereinafter, in order to distinguish the elements constituting the present system 100 from the upstream side or the downstream side of the second optical cell conveying section 104, the former is referred to as the "first" and the latter is referred to as the "second" May be added. Using this expression method, the optical cell P having the optical film 13 bonded to one side thereof in the first junction 103 is reversed (inversion of the front side and the rear side) on the downstream side of the second optical cell conveying section 104, Another optical film is bonded to the other surface to which the optical film 13 is not bonded, at the second bonding portion. As a result, the optical film is bonded to both surfaces of the optical cell P to produce an optical display panel.

In addition, various methods can be employed as the method for bonding the optical film to the optical cell P. [ In one example, the optical cell P is arranged parallel to the horizontal plane, and the first junction 103 joins the optical film to the upper surface of the optical cell P from above. Then, the front and back surfaces of the optical cell P are reversed so that the surface on which the optical film is not bonded is directed upward, and another optical film is bonded from above in the second junction.

Of course, the optical film may be bonded from below the optical cell P. In this case, the optical films may be bonded from below in both the first bonding portion 103 and the second bonding portion, or the bonding directions of the two may be different. In the latter case, after the optical film is bonded from above the optical cell P in the first bonding portion 103, the optical film is bonded from below the optical cell P at the second bonding portion without inversion of the optical cell P Can be adopted. Naturally, the joining direction of the first joining portion 103 and the second joining portion may be reversed.

In particular, when the optical cell P is a liquid crystal cell and the optical film is a polarizing film, it is necessary to make the polarizing directions of the polarizing films bonded to both surfaces of the liquid crystal cell P orthogonal to each other. Therefore, in the first bonding portion 103, the (first) optical film is bonded to the first surface of the optical cell P in the first joining direction, and in the second joining portion, And the (second) optical film is bonded to the second surface of the optical cell in the second joining direction.

Hereinafter, each element constituting the system 100 will be described in detail.

[Film and roll]

As described above, the carrier film carrying section 101 carries a laminated optical film 11 in which an optical film 13 including a pressure-sensitive adhesive is laminated on the carrier film 12. 1, the laminated optical film 11 is formed by laminating an optical film 13 on a carrier film 12. As shown in Fig. The optical film 13 includes the optical film main body 13a and the pressure-sensitive adhesive 13b.

1 shows a mode in which the carrier film conveying section 101 conveys the laminated optical film 11 fed out from the roll 1. As shown in Fig. In the roll 1, the laminated optical film 11 is wound in a roll form, but more specifically, the following forms are possible.

The roll 1 is configured such that a laminated optical film 11 having a band-like (long) optical film 13 formed on the carrier film 12 and the carrier film 12 with a pressure-sensitive adhesive interposed therebetween is wound in a roll form . In this case, the present system 100 includes a cut-out portion 20, which cuts the band-shaped optical film and the pressure-sensitive adhesive at predetermined intervals while leaving the carrier film 12 from the band-shaped optical film. That is, the laminated optical film 11 is half-cut by the cut portion 20. In this cutting section 20, for example, cutting may be performed so as to distinguish the good optical film from the defective optical film on the basis of the inspection result of the defect inspection apparatus in the continuous manufacturing system.

Alternatively, the roll 1 may be configured such that the laminated optical film 11 having the carrier film 12 and the optical film 13 formed on the carrier film 12 with the adhesive being interposed therebetween is wound in the form of a roll have. That is, in this case, in the laminated optical film 11, a perforated line is formed in the upper layer portion of the carrier film 12 in units of optical films (sheet flat portions) to be bonded to the optical cells P. In this case, the present system 100 does not necessarily have to be provided with the cut portion 20.

As an example of the optical film 13, a polarizing film can be used. The polarizing film is formed, for example, with a polarizer (thickness of about 1.5 to 80 占 퐉) and a polarizer protective film (thickness of about 1 to 500 占 퐉) on one surface or both surfaces of the polarizer with or without an adhesive.

As another example of the optical film 13, a retardation film such as a lambda / 4 plate or a lambda / 2 plate (thickness is generally from 10 to 200 mu m), a time compensation film, a brightness enhancement film and a surface protective film can be used. The optical film 13 may be formed as a laminated film in which two or more of these films including a polarizing film are laminated.

An example of the thickness of the laminated optical film 11 can be set within a range of 10 탆 to 500 탆. As the adhesive 13b interposed between the optical film main body 13a and the carrier film 12, various materials such as acrylic adhesive, silicone adhesive, and urethane adhesive can be used. The thickness of the pressure-sensitive adhesive 13b may be within a range of 10 to 50 占 퐉. The peeling force between the pressure-sensitive adhesive 13b and the carrier film 12 can be set to 0.15 (N / 50 mm wide sample) as an example, but not limited thereto. The peeling force is measured in accordance with JIS Z0237 standard.

As the carrier film 12, a known plastic film including a polyethylene terephthalate film, a polyolefin film, and the like can be used. If necessary, a release agent formed by a silicone system, a long-chain alkyl system, a fluorine system, molybdenum sulfide, or the like may be used.

[Carrier film conveying section]

The carrier film transport section 101 transports the carrier film 12 to the downstream side. In this embodiment, the carrier film carry section 101 has the cut section 20. The cut portion 20 cuts the laminated optical film 11 fed out from the roll 1 at a predetermined interval while leaving the carrier film 12 thereon. As a result, an optical film 13 corresponding to the size of the optical cell P is formed on the carrier film 12. The optical film 13 is peeled from the carrier film 12 in the peeling section 40 and supplied to the bonding section 103. In the present embodiment, the carrier film carrying section 101 has a cutting section 20, a dancer roll 30, a winding section 60, and an upstream film supply section 90.

The cut portion 20 cuts the band-shaped optical film 13 to a size corresponding to the optical cell P while fixing the laminated optical film 11 from the side of the carrier film 12 in the suction portion 21, , The sheet-like optical film 13 is formed. Examples of the cut portion 20 include a cutter and a laser device.

The upstream-side film supply portion 90 is disposed upstream of the peeling portion 40 in the transport direction. More specifically, the upstream-side film supply unit 90 includes a drive roller 90a that is rotationally driven by a motor (not shown), and a drive roller 90b which is disposed opposite to the drive roller 90a and faces the drive roller 90a (E.g., a compression spring, a leaf spring, or the like). The driving roller 90a is rotated while the laminated optical film 11 is sandwiched between the driving roller 90a and the driven roller 90b so that the driven roller 90b is driven to rotate and the laminated optical film 11 ) To the downstream peeling section (40).

The material used for the driving roller 90a and the driven roller 90b constituting the upstream-side film supply unit 90 may be, for example, metal, rubber or resin. These materials may be used throughout the roll, or at least on the outer surface of the roll.

As will be described later, in the present embodiment, the driving roller 90a of the upstream-side film supply unit 90 has a configuration in which rotation control is performed by the drive control unit 110. [ More specifically, the drive control section 110 drives and controls, for example, a motor that drives the rotation of the drive roller 90a. The drive control unit 110 controls the rotation direction, the number of revolutions, the rotation start, and the rotation stop of the motor.

The dancer roll 30 has a function of maintaining the tension of the carrier film 12 in each process such as a conveying process and a bonding process. By this dancer roll 30, tension can be more reliably given to the optical film 13 from the beginning of the bonding. As shown in Fig. 1, the carrier film carrying section 101 conveys the carrier film 12 to the joining section 103 at the downstream side via the dancer roll 30.

The winding portion 60 has a winding roller 60a for winding the carrier film 12 on which the optical film 13 has been peeled off from the peeling portion 40. [

[Peeling section]

The peeling section 40 is provided upstream of the joining section 103 and is folded with the carrier film 12 inward from the leading end section 40a so that the optical film 13 containing the adhesive from the carrier film 12 Peel off. The distal end portion 40a corresponds to a folding portion, and hereinafter may be referred to as " folding portion 40a " as appropriate. 1, the peeling section 40 has a sharp knife edge portion at its tip, but the present invention is not limited to this configuration.

[First Optical Cell Carrying Section]

The first optical cell conveying section 102 feeds and conveys the optical cell P to the joining section 103. In the present embodiment, the first optical cell conveying section 102 has a conveying roller 80 and an attracting plate or the like, and conveys the optical cell P to the downstream side of the production line by rotation of the conveying roller 80 or conveyance of the attracting plate do. When the optical cell P is transported to the bonding position of the bonding portion 103 by the first optical cell transporting portion 102, the bonding processing of the optical film 13 is performed.

[copula]

The bonding portion 103 bonds the optical film 13, which has been peeled off from the carrier film 12, to the optical cell P via an adhesive to form an optical display panel. The joining portion 103 is composed of a joining roller 50a and a driving roller (supporting roller) 50b. In this embodiment, the bonding operation in the bonding portion 103 is performed in the following procedure.

First, in the folding section 40a of the peeling section 40, the optical film 13 peeled off from the carrier film 12 is fed. This feeding operation is performed until the front end reaches the feeding position described later. Thereafter, the optical film 13 is back-fed, and the front end portion of the optical film 13 is returned to the detection position on the peeling section 40 side from the feeding position.

At this detection position, when the front end portion of the optical film 13 is detected by the detection portion 70 constituted by a CCD camera or the like, alignment with respect to the optical film 13 is performed based on the detection result. Thereafter, the optical film (13) is brought into contact with the bonding surface of the optical cell (P). After the contact, the optical film 13 is bonded to the optical cell P by being pressed by both rollers 50a and 50b provided in the joining portion 103. [

The bonding operation is preferably performed at the detection position, but may be performed at a position shifted from the detection position to the front and rear in the carrying direction.

The driving roller 50b is rotationally driven by a motor (not shown). The mechanism is not limited to the mechanism in which the joining roller 50a is driven by the driving roller 50b, but may be a mechanism in which the driving and the follower are opposite to each other, or both may be the driving mechanism.

[Second Optical Cell Carrier and Its Downstream Side]

The second optical cell conveying section 104 conveys the optical cell P to which the optical film 13 is bonded on one side by the first joining section 103 to the downstream side. On the downstream side, a reversing mechanism for inverting the optical cell P in the front and back direction, and a rotation mechanism for rotating the optical cell P horizontally by 90 degrees as needed. After the direction of the optical cell P is adjusted through the inversion mechanism or the rotation mechanism, another optical film is bonded at the second junction.

In addition, as the various means for bonding the optical film to the other surface of the optical cell P on the downstream side of the second optical cell conveying section 104, the same means as the various means and apparatuses described above can be used. That is, the second carrier film conveying portion can be constituted by the same device as the first carrier film conveying portion, and the second joining portion can be constituted by the same device as the first joining portion.

The optical display panel carrying section (not shown) is composed of a conveying roll, an attracting plate, and the like, and conveys the optical display panel manufactured by the second joining section to its downstream side. An inspection device for inspecting the optical display panel may be provided on the downstream side of the conveyance. The inspection purpose and inspection method of the inspection apparatus are not particularly limited.

[Driving Control Section]

As described above, in this embodiment, the rotation of the driving roller 90a of the upstream-side film supply unit 90 is controlled. Thus, the drive control section 110 can adjust the conveying speed / conveying direction of the carrier film 12 toward the peeling section 40.

In the present embodiment, the drive control unit 110 temporarily drives the drive roller 90a in the reverse rotation state while the optical film 13 is fed from the carrier film 12 in the peeling unit 40, The carrier film 12 located at the upstream side of the portion 40a is controlled to be back-fed. This is a control for the purpose of preventing deformation of the optical film main body 13a due to the adhesive force of the pressure-sensitive adhesive 13b.

It is preferable that the back feed of the carrier film 12 performed under the control of the drive control section 110 is a stage before bonding treatment to each optical cell P and is performed sequentially. At this time, a series of operations of bonding the optical film 13 to the optical cell P after repeating the back feed operation for a small amount of time while feeding the optical film 13 is repeated.

[Explanation of mechanism]

The reason why deformation of the optical film main body 13a can be prevented by feeding back the carrier film 12 located upstream of the folding section 40a will be described with reference to Figs. 2A to 2C.

2A to 2C are schematic diagrams showing a step of peeling the optical film 13 from the carrier film 12 together with the adhesive. In this embodiment, first, as shown in Fig. 2A, the optical film 13 is fed in the folding section 40a of the peeling section 40. Fig. At this time, the feeding is performed to the front of the detection position 62 for alignment of the bonding (feeding position 61) with respect to the carrying direction D2 of the optical cell P. [ That is, the feeding is performed until the front end portion of the optical film 13 reaches the feeding position 61.

2B, the carrier film 12 on the upstream side of the folding section 40a is back-fed in the D1r direction so that the front end portion of the optical film 13 is moved to the detection position 62 in the transport direction D2, .

By performing this process, the optical film 13 fed at the time of FIG. 2A is forcibly peeled off from the carrier film 12, and then returns to the detection position 62. That is, according to the present method, since the optical film 13 is peeled off from the carrier film 12 at substantially the same position in the feeding operation and then set at the detection position 62, the peeling position is changed every bonding operation There is no work. As a result, as shown in Fig. 2C, the deformation caused by the adhesive force of the pressure-sensitive adhesive 13b is greatly alleviated at the time when the leading end portion is reset to the detection position 62. [

Therefore, by performing alignment with respect to the optical film 13 at the detection position 62 after the backfeed operation, the fluctuation of the front end portion of the optical film 13 is reduced, so that the time required for alignment is shortened. In addition, since the position of the front end portion of the optical film 13 is detected, the deviation of the focus of the camera is extremely reduced. Then, by performing the joining operation thereafter, the degree of deviation of the joining position is suppressed, and the joining accuracy is greatly improved.

[Continuous Production Method]

With the above-described system 100, the method of continuously manufacturing the optical display panel (the present method) is realized by the following respective steps.

(1) The method has a step of transporting the carrier film 12 in which the optical film 13 is laminated via the pressure-sensitive adhesive 13b by the carrier film carrying section 101.

(2) In this method, the carrier film 12 carried by the peeling section 40 is folded inward from the folding section 40a, and the optical film 13 is peeled off from the carrier film 12 together with the adhesive .

(3) The method has a step of transporting the optical cell P by the optical cell conveying unit 102. And a step of bonding the optical film (13) peeled off from the carrier film (12) to the optical cell (P) carried by the bonding portion (103) via an adhesive to form an optical display panel.

(4) In this method, the carrier film 12 is peeled off by the peeling unit 40 until the front end of the optical film 13 reaches the feeding position 61 ahead of the alignment detecting position 62 for alignment , And a step of performing control to return the front end portion of the optical film 13 to the detection position 62 by the drive control section 110 (back feed step).

In the present embodiment, as described above, by the rotation control of the drive roller 90a of the upstream-side film supply unit 90 by the drive control unit 110, the upstream side of the folding unit 40a The carrier film 12 may be backfilled by way of example. As another example, it is also possible to provide a conveying roller between the dancer roll 30 and the peeling unit 40, and perform a backfeed operation by controlling the rotation of the roller.

Further, in the backfeeding step, until the front end reaches the feeding position 61, the optical film 13 is transported and then returned to the detection position 62. In the feeding operation in the transport direction, May be combined once or plural times.

It is preferable that the front end portion of the optical film 13 is returned to the detection position 62 and then the optical cell 13 is bonded to the optical cell P at that position. By doing so, the bonding operation can be performed while maintaining a high alignment accuracy, so that the effect of reducing the bonding displacement can be further enhanced.

The carrier film 12 may be back-fed by controlling the wind-up roller 60a located downstream of the folding section 40a or the drive roller 95a of the downstream-side film supply section in reverse rotation.

Example

[Experimental Method]

The experimental method will be described with reference to Fig.

The case where the backfeed operation is performed before the bonding is taken as an example and the case where the backfeed operation is not performed is taken as a comparative example. In both the examples and the comparative examples, the thickness of the film (corresponding to the optical film 13) to be peeled was set to two patterns of 75 mu m and 38 mu m.

In the Comparative Example it was measured for the angle θ to the horizontal plane from the 20㎜ by feeding the leading end, and an optical film 13 from the leading end of the folded portion (40a) of the separation unit 40 (the angle is called a θ ₁ box). At this time,? ₁ corresponds to the feeding angle of the optical film 13 when the front end portion 13t of the optical film 13 is transported to the detection position 62 without performing the backfeed operation. Thereafter, bonding to the optical cell P was performed, and the bonding position was measured.

In the embodiment, the optical film 13 is fed by 30 mm from the leading end of the folding section 40a of the peeling section 40, and then the back feeding operation of 10 mm is carried out to adjust the feeding length to 20 Mm. In this situation, the angle? Is measured (this angle is referred to as? ₂ ). At this time,? ₂ is the optical film 13 at the time when the back feed operation is performed after returning to the feeding position 61 ahead of the detection position 62 and the front end portion 13t is returned to the detection position 62 again. Respectively. Thereafter, bonding to the optical cell P was performed, and the bonding position was measured by the same method as the comparative example.

The materials used in the experiment are as follows.

MRF75CK (thickness 75 占 퐉) and MRF38CK (thickness 38 占 퐉) manufactured by Mitsubishi Heavy Industries Ltd. were used as (1) the film to be peeled (hereinafter referred to as "film A" Respectively. In Example 1 and Comparative Example 1, those having a thickness of 75 占 퐉 were used, and in Example 2 and Comparative Example 2, those having a thickness of 38 占 퐉 were used.

(2) MRF38CK (thickness 38 mu m) manufactured by Mitsubishi Rayon Co., Ltd. was used as a transport film (hereinafter referred to as "film B" and corresponds to the carrier film 12).

(3) Film A and film B both had a width of 100 mm.

Other experimental conditions are as follows.

(1) The feeding speed of the film A was 2 m / sec.

(2) The curvature radius R of the tip portion 40a of the peeling portion 40 was 1 mm.

(3) The number of samples was 3.

[Experiment result]

Experimental results performed under the above experimental conditions will be described with reference to FIGS. 4A and 4B.

4A shows the average value and the degree of fluctuation of the feeding angle? In each experiment in the examples and the comparative examples. In Fig. 4A, in Comparative Example 1, the average value of the feeding angle? Is 18.2 占 and the variation is 17.6 占 to 19.4 占. On the other hand, in Example 1, the average value of the feeding angle? Is 17.6 占 and the variation thereof is 17.4 占 to 18.1 占. As a result, it can be seen that the variation of Example 1 is smaller than that of Comparative Example 1. Likewise, it can be seen that the variation of Example 2 is small even when the comparison example 2 and the example 2 are compared. That is, even in all cases where the thickness of the optical film 13 is 75 탆 and 38 탆, the variation in the examples is smaller than that in the comparative example.

Fig. 4B shows the average value and degree of fluctuation of bonding positions in each experiment in the examples and comparative examples. Fig. Even in this experiment, even in all cases where the thickness of the optical film 13 is 75 탆 and 38 탆, the variation in the examples is smaller than that in the comparative example.

It is assumed that the thinner the thickness of the optical film 13, the more easily the optical film 13 is deformed by the influence of the adhesive force of the pressure-sensitive adhesive, and the feeding angle tends to vary. However, according to the experimental results, even when the thickness is reduced to 38 占 퐉, the effect of reducing the variation can be obtained.

As a result of the backfeed operation being carried out before bonding, the fluctuation of the feeding angle is alleviated, so that the effect of reducing the variation of the bonding position can be obtained.

1: roll
11: laminated optical film
12: Carrier film
13, 13x, 13y: optical film
13a: Optical film body
13b: Adhesive
20:
21:
30: Dancer roll
40:
40a: a tip portion of the peeling portion (folding portion)
50a: drive roller
50b: receiving roller
60:
60a: take-up roller
61: Feeding position
62: Detection position
70:
80: Target joint position
90: Upstream film feeder
90a: a driving roller of the upstream-
90b: a driven roller of the upstream-side film supply section
95: downstream-side film supply unit
95a: drive roller of the downstream-side film supply unit
95b: a driven roller of the downstream-side film supply unit
100, 100a, 100b, 100c: Continuous manufacturing system of optical display panel
101: Carrier film conveying section
102: first optical cell conveying section
103:
104: second optical cell conveying section
110:
F: Adhesion
P: optical cell
PL: panel line

Claims (6)

A step of transporting a carrier film on which an optical film is laminated via an adhesive,
Folding the conveyed carrier film inward, peeling the optical film from the carrier film together with the pressure-sensitive adhesive,
A step of returning the front end of the optical film to the detection position after peeling the carrier film until the front end of the optical film reaches the feeding position ahead of the detection position for alignment by the peeling process;
Detecting a front end portion of the optical film at the detection position and performing alignment of the optical film based on the detection result,
And bonding the optical film after the alignment to the optical cell to be conveyed, via the pressure-sensitive adhesive. The continuous manufacturing method of an optical display panel according to claim 1, wherein the front end portion of the optical film is returned to the detection position by performing a back feed operation for reversing the carrying direction of the carrier film once or plural times. The optical film according to claim 1 or 2, wherein after the front end of the optical film is returned to the detection position, the optical film peeled from the carrier film is bonded to the optical cell at the detection position A continuous manufacturing method of an optical display panel. A carrier film conveying section for conveying a carrier film in which an optical film containing a pressure sensitive adhesive is laminated via the pressure sensitive adhesive,
A peeling section for folding the carrier film conveyed by the carrier film conveying section inward from the folding section and peeling the optical film from the carrier film;
An optical cell conveyance section for conveying the optical cell,
A bonding portion joining the optical film peeled off from the carrier film in the peeling section to the optical cell carried by the optical cell carrier section via the adhesive,
And a drive control section capable of controlling the conveying direction of the carrier film,
The drive control section performs control to return the front end portion of the optical film to the detection position at the stage where the front end of the optical film reaches the feeding position ahead of the detection position for alignment,
Wherein the bonding portion joins the optical film aligned at the detection position to the optical cell after the front end portion of the optical film is returned to the detection position. The image forming apparatus according to claim 4, further comprising: a driving roller that is provided on the upstream side of the folding section and conveys the carrier film on which the optical film is stacked,
Wherein the drive control unit performs control to invert the transport direction of the carrier film to return the front end of the optical film to the detection position by performing control to invert the rotational direction of the drive roller Continuous manufacturing system. The continuous manufacturing system for an optical display panel according to claim 4 or 5, wherein the bonding portion joins the optical film peeled off from the carrier film to the optical cell at the detection position.

Images