KR101717830B1 - Method for continuously producing optical display panel and system for continuously producing optical display panel - Google Patents

Abstract

INDUSTRIAL APPLICABILITY The present invention suppresses deflection of an optical display panel after bonding while reducing bubble defects that may easily occur between an optical cell and an optical film at the initial stage of bonding. A continuous manufacturing method of an optical display panel includes a carrier film transporting step of transporting a carrier film, a peeling step of peeling the optical film from the carrier film, a peeling step of peeling the optical film from the carrier film, The bonding speed of the optical film with respect to the optical cell is set to be larger than the transporting speed of the peeled carrier film until the completion point of time and the bonding speed and the transporting speed are matched And a bonding step of forming an optical display panel by bonding the optical film to the optical cell via a pressure sensitive adhesive while transporting the optical cell.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [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 an optical display panel manufacturing system in which an optical film peeled from a carrier film is bonded to an optical cell via an adhesive to form an optical display panel.

The carrier film on which the optical film is formed is folded back to the peeling means while the rotational speed of the take-up roll of the carrier film and the rotational speed of the joining roll are synchronized and the same speed is carried out. There is known a continuous manufacturing system of an optical display panel in which a peeled optical film is peeled off and a peeled optical film is continuously bonded to an optical cell via a pressure sensitive adhesive (for example, refer to Patent Document 1).

On the other hand, there is disclosed a continuous manufacturing method of a liquid crystal display device in which a transporting speed of a liquid crystal panel is made higher than a transporting speed of an optical film, and an optical film is bonded to an optical cell (for example, see Patent Document 2).

Japanese Patent Application Laid-Open No. 2004-338408 Japanese Patent Application Laid-Open No. 2011-197280

However, in Patent Document 1, it is feared that air bubbles are generated between the optical cell and the optical film due to instability of device control, particularly at the beginning of bonding.

On the other hand, in Patent Document 2, since an optical film is bonded to an optical cell while a strong tension is always applied to the optical film, the tensile force applied to the optical film is increased throughout the bonding process, Is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a continuous manufacturing method of an optical display panel capable of suppressing warpage of an optical display panel after bonding while reducing bubble defects that may occur between an optical cell and an optical film at the beginning of bonding And a continuous manufacturing system of the optical display panel.

As a result of intensive studies to solve the above problems, it has been found that a speed difference (bonding speed> transporting speed) is set between the bonding speed of the optical film to the optical cell and the carrying speed of the carrier film at the beginning of bonding, It has been found that the generation of bubbles and the occurrence of warping of the optical display panel can be suppressed by providing a period in which the speed is synchronized with the conveying speed of the carrier film or a period in which the conveying speed is higher than the joining speed.

A method of continuously manufacturing an optical display panel of the present invention comprises:

A carrier film transporting step of transporting a carrier film in which an optical film containing a pressure sensitive adhesive is laminated via the pressure sensitive adhesive,

A peeling step of peeling the optical film from the carrier film by folding back the carrier film conveyed by the carrier film conveying step inward;

The bonding speed of the optical film with respect to the optical cell is higher than the bonding speed between the optical film and the optical cell until the optical film is peeled off The carrier speed of the carrier film is set to be larger than the conveyance speed of the carrier film, and a period in which the bonding speed coincides with the conveying speed is provided after the middle point of time, or a period in which the conveying speed is higher than the bonding speed, And a bonding step of bonding the optical film peeled off from the carrier film in the peeling step to the optical cell via the adhesive to form an optical display panel while conveying the cell.

In this configuration, by setting the speed difference (the conveying speed of the carrier film <the joining speed) at the beginning of joining in which fluctuations such as the conveying speed of the carrier film tend to occur, the joining stability at the initial joining can be realized and the generation of bubbles can be suppressed . It is also possible to prevent the tension applied to the optical film from increasing throughout the bonding process by providing a period in which the bonding speed and the conveying speed coincide with each other in the subsequent bonding period or by providing a period in which the conveying speed is higher than the bonding speed The warping of the optical display panel can be suppressed.

In one embodiment of the present invention, the joining step includes a first joining step of joining the first optical film to the first surface of the optical cell in the first joining direction, and a second joining step of joining the first optical film to the second surface in the second joining direction, And a second bonding step of bonding the second optical film to the second surface of the optical cell in the bonding direction.

In this configuration, in the optical film bonded to one side and the optical film bonded to the other side, shrinkage stress due to the tension at the time of bonding is orthogonal, so that shrinkage stresses can not be offset. Even in such a case, according to the present invention, since the shrinking stress of the optical film itself is reduced, warpage of the optical display panel can be appropriately suppressed.

In one embodiment of the present invention, a speed relationship in which the conveying speed of the carrier film is zero and the joining speed is greater than zero may be set at an early stage of joining at a time point from a joining start point to a joining completion point.

In the embodiment of the present invention, the period (region) in which the bonding speed is set faster than the conveying speed of the carrier film varies depending on the dimensions of the optical film. For example, More preferably not more than 2/3, more preferably not more than 1/2, still more preferably not more than 1/3.

With this configuration, it is possible to improve the generation of bubbles at the initial stage of bonding by setting the bonding speed to be larger than the conveying speed of the carrier film at half or less of the bonding area of the optical cell (initial bonding) Warping of the optical display panel can be improved by providing a period in which the speed and the conveying speed of the carrier film coincide or a period in which the conveying speed is higher than the joining speed.

In one embodiment of the present invention, the joining step has a configuration in which the joining speed is greater than zero from the joining start point to the joining completion point, and the carrier velocity of the carrier film is zero before the joining is completed.

In this configuration, the bonding speed can be made steeper than zero by increasing the bonding speed from the bonding start time to the bonding completion time. Further, by reducing the conveying speed of the carrier film to zero before the completion of the bonding, curling of the optical film bonded to the optical cell can be prevented next.

Further, another continuous inventive manufacturing system 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 unit folded back with the carrier film conveyed by the carrier film conveying unit inward to peel off the optical film from the carrier film;

A bonding portion for carrying the optical cell and bonding the optical film peeled off from the carrier film in the peeling portion to the optical cell via the adhesive to form an optical display panel;

The bonding speed of the optical film with respect to the optical cell is lower than the bonding speed between the optical film and the optical cell until the bonding time between the beginning of the bonding of the optical film to the optical cell and the completion of bonding The bonding portion is driven so as to provide a period in which the bonding speed and the conveying speed coincide with each other or a period during which the conveying speed is higher than the bonding speed, And a drive control section for drivingly controlling the carrier film carry section.

In this configuration, by setting the speed difference (the conveying speed of the carrier film <the joining speed) at the beginning of joining in which fluctuations such as the conveying speed of the carrier film tend to occur, the joining stability at the initial joining can be realized and the generation of bubbles can be suppressed . It is also possible to prevent the tension applied to the optical film from increasing throughout the bonding process by providing a period in which the bonding speed and the conveying speed coincide in the subsequent bonding period or providing a period in which the conveying speed is higher than the bonding speed The warping of the optical display panel can be suppressed.

In one embodiment of the present invention, the bonding portion includes a first bonding portion for bonding the first optical film to the first surface of the optical cell in the first bonding direction, and a second bonding portion for bonding the first optical film to the first surface of the optical cell in the second bonding direction And a second junction joining the second optical film to the second surface of the optical cell.

In this configuration, in the optical film bonded to one side and the optical film bonded to the other side, shrinkage stress due to the tension at the time of bonding is orthogonal, so that shrinkage stresses can not be offset. Even in such a case, according to the present invention, since the shrinking stress of the optical film itself is reduced, warpage of the optical display panel can be appropriately suppressed.

In the embodiment of the present invention, the period (region) in which the bonding speed is set faster than the conveying speed of the carrier film varies depending on the dimensions of the optical film. For example, More preferably not more than 2/3, more preferably not more than 1/2, still more preferably not more than 1/3.

According to an embodiment of the present invention,

It is preferable that the bonding film is driven and controlled so that the bonding speed becomes greater than zero from the start of the bonding to the completion of bonding until the carrier film is transported at a zero speed before the bonding is completed Do.

According to an embodiment of the present invention,

It is preferable that the bonding portion is driven and controlled so that the bonding speed and the conveying speed of the carrier film become zero immediately before the start of the next bonding, and the driving of the carrier film carrying portion is controlled.

The bonding portion may be provided with a bonding roller which presses the optical film onto the optical cell surface and a receiving roller which is disposed opposite to the bonding roller, and the optical film is sandwiched between the bonding roller and the receiving roller, And the optical film is bonded to the optical cell surface while the optical cell is supported and held,

And the drive control section drives and controls the joining roller and / or the receiving roller.

In one embodiment of the present invention, the carrier film conveying portion includes an upstream-side film feed portion (feed roller) disposed upstream of the peeling portion for conveying the strip-shaped carrier film and / or a strip- (Feed roller) for conveying the carrier film of the upstream side film supply section and the downstream side film supply section (feed roller), and the drive control section drives and controls the upstream side film supply section and / or the downstream side film supply section to transport the carrier film.

In one embodiment of the present invention, the carrier film conveying section has a winding section for winding up the carrier film after the optical film is peeled off, and the drive control section drives and controls the winding section to convey the carrier film. Further, the carrier film conveying section may have at least one of an upstream-side film supply section, a downstream-side film supply section, and a winding section.

1 is a schematic view showing an example of a continuous manufacturing system of an optical display panel;
2A is a diagram for explaining an operation of a drive control section;
FIG. 2B is a diagram for explaining the operation of the drive control unit; FIG.
FIG. 2C is a diagram for explaining the operation of the drive control section; FIG.
FIG. 2D is a diagram for explaining the operation of the drive control section; FIG.
FIG. 2E is a view for explaining the operation of the drive control section; FIG.
3 is a view showing a speed relationship between a joining speed and a winding speed in the embodiment;
4A is a view showing a speed condition of Embodiment 1. Fig.
4B is a view showing a speed condition of Embodiment 2. Fig.
4C is a view showing the speed condition of Embodiment 3. Fig.
4 (d) is a view showing the speed condition of the embodiment 4. Fig.
Fig. 4E is a view showing the speed condition of Embodiment 5. Fig.
5A is a view showing a speed condition of Comparative Example 1. Fig.
5B is a view showing the speed condition of Comparative Example 2. Fig.

In the present embodiment, the form in which the optical film is formed on the carrier film is not particularly limited. For example, it may be configured to be wound in a roll shape. Examples of the rolls include (1) a roll of a laminated optical film having a carrier film and a band-shaped optical film formed on the carrier film with a pressure-sensitive adhesive interposed therebetween. In this case, in order to form an optical film from a strip-shaped optical film, the continuous production system of the optical display panel leaves the carrier film without cutting, and the strip-shaped optical film and the pressure- Cut in half).

As the roll, for example, (2) a roll of a laminated optical film having a carrier film and an optical film formed on the carrier film with a pressure-sensitive adhesive interposed therebetween (roll of the so-called perforated line insertion laminated optical film) have. Examples of the optical film include a polarizing film, a brightness enhancement film, a retardation film, and an optical film obtained by laminating two or more thereof.

1 includes a first carrier film 12 and a first polarizing film (an example of an optical film) 13 laminated on the first carrier film 12 The first laminated optical film 11 is wound in a roll form. The first polarizing film 13 has a film body 13a and a pressure-sensitive adhesive layer 13b.

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 without an adhesive or an adhesive. As the other films constituting the first laminated optical film 11, for example, a retardation film such as a? / 4 plate and a? / 2 plate (thickness is generally 10 to 200 占 퐉), a viewing compensation film, And surface protective films. The thickness of the laminated optical film may range, for example, from 10 탆 to 500 탆. The pressure-sensitive adhesive interposed between the polarizing film and the carrier film is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, silicone pressure-sensitive adhesives, and urethane pressure-sensitive adhesives. The layer thickness of the pressure-sensitive adhesive is preferably in the range of, for example, 10 탆 to 50 탆. The peeling force between the pressure-sensitive adhesive and the carrier film is, for example, 0.15 (N / 50 mm wide sample), but is not limited thereto. The peel force is measured in accordance with JIS Z0237.

As the carrier film, conventionally known films such as a plastic film (for example, a polyethylene terephthalate film, a polyolefin film, etc.) can be used. Further, if necessary, a suitable one conventionally used may be used, such as one obtained by coating with a suitable releasing agent such as a silicone type, a long chain alkyl type, a fluorine type or molybdenum sulfide.

In an optical display panel, at least an optical film is bonded to one side or both sides of an optical cell via an adhesive, and a driving circuit is incorporated as necessary. The optical cell includes, for example, a liquid crystal cell and an organic EL cell. The liquid crystal cell may be of any type, for example, a vertically aligned (VA) type, an in-plane switching (IPS) type or the like. As the organic EL cell, for example, any types such as a top emission type, a bottom emission type, and a double emission type can be used. The liquid crystal cell P shown in Fig. 1 has a structure in which a liquid crystal layer is sealed between a pair of substrates arranged opposite to each other (a first substrate Pa and a second substrate Pb).

&Lt; Embodiment 1 >

Hereinafter, a continuous manufacturing system of the optical display panel according to the present embodiment will be described in detail with reference to Figs. 1 to 3, but the present invention is not limited to the aspect of the present embodiment. A liquid crystal cell will be described as an optical cell, and a polarizing film will be described as an optical film. Hereinafter, a liquid crystal cell in which a polarizing film is bonded to both surfaces is referred to as a liquid crystal display panel. Fig. 1 is a schematic view of a continuous manufacturing system of an optical display panel, and Fig. 2 is a view for explaining the operation of a drive control section. Fig. 3 is a view showing the relationship between the joining speed and the winding speed.

The continuous manufacturing system of an optical display panel according to the present embodiment is provided with a first carrier film transferring section 101, a first peeling section 40, a first liquid crystal cell transferring section 102, a first joining section 103 (The first bonding roll 50a and the first driving roll 50b), the first driving control unit 110, the second liquid crystal cell conveying unit 104, the second carrier film conveying unit, and the second A peeling section, a second joining section (second joining roll, second driving roll), a second driving control section, and an optical display panel conveying section. In this embodiment mode, a polarizing film is bonded from the upper side of the liquid crystal cell, and then the liquid crystal cell to which the polarizing film is bonded is reversed (front-to-back reversal, The polarizing film may be bonded from the lower side of the liquid crystal cell and the polarizing film may be bonded from the lower side of the liquid crystal cell by inverting the liquid crystal cell and the polarizing film may be bonded from the upper side of the liquid crystal cell, The polarizing film may be bonded from the lower side and the polarizing film may be bonded from the upper side of the liquid crystal cell without reversing the liquid crystal cell by bonding the polarizing film from the lower side of the liquid crystal cell.

The first liquid crystal cell conveying portion 102 feeds the liquid crystal cell P to the first bonding portion 103 and conveys it. In the present embodiment, the first liquid crystal cell conveying section 102 is constituted by a conveying roller section 80 and an attracting plate. The liquid crystal cell P is conveyed to the downstream of the production line by rotating the conveying roller 80 or conveying the attracting plate. The first liquid crystal cell transport section 102 is controlled by a first drive control section 110 to be described later and the liquid crystal cell P is bonded to the first junction section 103 Position.

The first carrier film transport section 101 transports the first carrier film 12 in which the strip-shaped first polarizing film including the adhesive is laminated via the adhesive. In the present embodiment, the first carrier film transport section 101 unwinds the first laminated optical film 11 from the first roll 1, cuts the strip-shaped first polarizing film at predetermined intervals, (20) for forming a film (131) on the first carrier film (12). The polarizing film 131 is peeled from the first carrier film in the first peeling section 40 to be described later and supplied to the first bonding section 103. Therefore, the first carrier film carry section 101 has the first cut section 20, the first dancer roll 30, and the first takeup section 60. The first carrier film transport section 101 is provided with a feed roll 12 for transporting the first carrier film 12 (the first laminated optical film 11) on the transport upstream side or the transport downstream side from the first peeling section 40, (Not shown).

The first cut portion 20 fixes the first laminated optical film 11 from the first carrier film 12 side in the adsorption portion 21 and fixes the first polarized film in a strip shape to the liquid crystal cell P corresponding to the liquid crystal cell P And the first polarizing film 131 is formed on the first carrier film 12. [ Examples of the first cut portion 20 include a cutter and a laser device.

The first dancer roll 30 (corresponding to the tension adjusting portion) has a function of maintaining the tension of the first carrier film 12 in each process such as a transporting process and a bonding process. With this first dancer roll 30, tension can be more reliably given to the first polarizing film 131 from the beginning of the bonding. The first carrier film transport section 101 transports the first carrier film 12 via the first dancer roll 30.

The first peeling section 40 is folded back with the first carrier film 12 inward at the front end thereof when the first polarizing film 131 is bonded to the liquid crystal cell P to form the first carrier film 12, The first polarizing film 131 (including the adhesive) is peeled off. In the present embodiment, a sharp knife edge portion is used as the first peeling portion 40, but the present invention is not limited to this.

The first winding section 60 has a winding roller 60a and winds the first carrier film 12 on which the first polarizing film 131 has been peeled off to the winding roller 60a. In this embodiment, the winding speed V1 (t) of the first carrier film 12 by the first winding section 60 is the first polarizing film 131 in the bonding period (process) of the first polarizing film 131, The film 131 corresponds to the conveying speed of the peeled carrier film. The first winding section 60 is driven by the first drive control section 110 to be described later (start, stop, rotation speed, etc.). The first drive control section 110 controls the motor M1 for rotating the take-up roller 60a of the first take-up section 60, for example.

The first bonding portion 103 bonds the first polarizing film 131 peeled off from the first carrier film 12 to the liquid crystal cell P via the adhesive agent while the liquid crystal cell P is being transported, . In the present embodiment, the first bonding portion 103 is composed of a first bonding roller 50a and a first driving roller (supporting roller) 50b. The rotation speed of the first driving roller 50b corresponds to the bonding speed V2 (t) and the first driving roller 50b corresponds to the driving speed V2 (Drive start, stop, rotation speed, and the like) by the control unit 110. The first joining roller 50a is driven by the first drive roller 50b, but is not limited thereto. The mechanism may be a mechanism in which the drive and the follower are opposite to each other, It may be a mechanism. The first drive control unit 110 controls the motor M2 for rotating the first drive roller 50b, for example.

The first polarizing film 131 is fed to the bonding position Q by winding the first carrier film 12 by the first winding section 60 (or by the feed roller not shown). On the other hand, the liquid crystal cell P is conveyed by the rotation of the first driving roller 50b and the first joining roller 50a, and the first polarizing film 131 is bonded to the liquid crystal cell surface at the same time of this conveyance.

At this time, the first polarizing film 131 is sandwiched between the first driving roller 50b and the first joining roller 50a by the feeding action by the first winding portion 60 (or the feed roller) An incoming incoming action is occurring. That is, when the pulling action (bonding speed V2) is larger than the conveying action (the conveying speed by the take-up speed V1 or the feed roller), a warpage occurs in the liquid crystal display panel after the bonding by the increase in tension In contrast, in the case where the first polarizing film 131 is warped due to warping, bubble defects may occur at the beginning of the bonding. Therefore, in the present embodiment, the above problem is solved by controlling the first winding portion 60 (winding speed V1) and the first bonding portion 50 (bonding speed V2) as follows.

The first driving control section 110 controls the first winding section 60 and the first driving roll 50b and controls the first driving film 50 and the second driving film 50 in the bonding process of the first polarizing film 131, (Conveying speed of the carrier film, feeding speed of the polarizing film) of the first polarizing film 131 and the bonding speed V2 (the conveying speed of the liquid crystal cell, The feeding speed of the polarizing film). Fig. 3 shows the speed relationship of the winding speed V1 and the bonding speed V2 in the whole period of the bonding treatment.

3, the peeling start of the first polarizing film 131 from the first carrier film 12 is started and the first polarizing film 131 is sent to the bonding position Q See Fig. 2a, V1 > 0). At this time, the first polarizing film 131 is sent to the bonding position Q by the take-up roller 60a, or by the feed roller on the upstream side of the conveying or the downstream side of the conveying from the first separating portion 40. The first polarizing film 131 reaches the bonding position Q and once the feeding is stopped (the winding roll 60a is stopped (see Fig. 2B, V1 = 0)).

Subsequently, the bonding process is started. The winding roll 60a, the first driving roller 50b and the first joining roller 50a are rotated at the joining start time T1 (and also the winding start time T2) at the beginning of joining. The bonding speed V2 of the first polarizing film 131 with respect to the liquid crystal cell P is lower than the bonding speed V2 of the first polarizing film 131 between the bonding start point T1 and the bonding completion point T5, , And the winding speed V1 of the first carrier film 12 (V2 > V1 > 0). (V2 = V1), the joining speed V2 and the winding speed V1 are made to coincide with each other at the time of the middle point (time at which the speed is synchronized) (T3). The first polarizing film 131 and the liquid crystal cell P are sandwiched between the rolls of the first driving roller 50b and the first joining roller 50b and the first polarizing film 131 is conveyed to the liquid crystal cell P (See Fig. 2C).

Subsequently, the winding speed V1 and the bonding speed V2 are matched (V1 = V2) even in the middle of joining. In order to stop the winding roll 60a after the first polarizing film 131 is completely peeled off from the first carrier film 12 at the present joining boom, The winding speed V1 is reduced to the fourth speed T4 and the rotation of the winding roll 60a is stopped before completion of the bonding (V1 = 0, see Fig. 2d). Thereafter, the bonding of the first polarizing film 131 to the liquid crystal cell P is completed while the rotation of the first driving roll 50b is decelerated (the bonding speed is reduced) (the bonding completion time T5, 2e). After the completion of the bonding, the rotation of the first driving roll 50b is stopped (V2 = 0). Thereafter, the process proceeds to the preparation for next bonding.

In the above description, the relationship between the bonding speed V2 and the winding speed V1 is from the bonding start point T1 to the middle point T3. In this speed relationship, the first polarizing film 131 The period (region) to be bonded to the liquid crystal cell P is 1/2 or less of the length of the junction.

Further, it is preferable that the first drive control section 110 performs drive control so as to attain a speed relationship of V2 > V1 at least immediately before the completion of the bonding.

The first drive control section 110 drives and controls the first drive roller 50b so that the joining speed V2 becomes greater than zero from the joining start time T1 to the joining completion time T5, The winding roll 60a of the first winding section 60 is driven and controlled so that the winding speed V1 is zero beforehand. The first drive control section 110 controls the first drive roller 50b and the first takeup section 60 such that V2 (t) = 0 and V1 (t) = 0 immediately before the start of the next joint, (60a).

The first drive control unit 110 may be provided on the downstream side of the first peeling unit 40 instead of the first takeup unit 60 (or in addition to the first takeup unit 60) The feed speed of the first carrier film 12 may be controlled by controlling a feed roller (not shown) provided on the upstream side of the first carrier film 12.

The first drive control unit 110 controls the feed roller (not shown) provided upstream of the first peeling unit 40 in addition to the first take-up unit 60 so that the first carrier film 12 May be controlled.

The first drive control section 110 may be constituted by a dedicated device or a dedicated circuit, or may be constituted by cooperation between a computer and a program for executing each control procedure, or may be constituted by firmware.

In the above embodiment, the relationship between the joining speed V2 and the winding speed V1 is from the joining start time T1 to the middle time point T3, and the joining speed V2 is set after the time T3. And the winding speed V1 coincide with each other. In another embodiment, the relationship between the joining speed V2 and the winding speed V1 is from the joining start point T1 to the middle point T3, and after the point in time T3, May be provided so as to be longer than the bonding speed V2.

(Second liquid crystal cell conveying portion)

The second liquid crystal cell conveying section 104 conveys the liquid crystal cell P to which the first polarizing film 131 is bonded by the first joining section 103 and supplies the liquid crystal cell P to the second joining section. The second liquid crystal cell conveying section 104 is provided with a rotation mechanism (not shown) for horizontally rotating the liquid crystal cell P to which the first polarizing film 131 is bonded by 90 degrees, And an inversion mechanism for inverting the liquid crystal cell P in the up and down direction. That is, in the first bonding portion 103, the first polarizing film 131 is bonded to the first surface of the liquid crystal cell P in the first bonding direction, and in the second bonding portion, And the second polarizing film is bonded to the second surface of the liquid crystal cell (P) in the second joining direction.

As described above, various means for bonding the polarizing film to the other surface of the liquid crystal cell P can be used. The second carrier film conveying section can be constituted by the same device as the first carrier film conveying section and the second joining section can be constituted by the same device as the first joining section. For example, the second dancer roll may be constructed in the same manner as the first dancer roll 30, and the second winding portion may be constructed in the same manner as the first winding portion 60, The roller and the second drive roller can be configured by the same mechanism as the first contact roller 50a and the first drive roller 50b. In addition, the second drive control unit has the same function as the first drive control unit 110.

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

(Continuous manufacturing method)

The continuous manufacturing method of the optical display panel according to the present embodiment includes a carrier film transporting step of transporting a first carrier film 12 in which a first polarizing film 131 including a pressure sensitive adhesive is laminated via the pressure sensitive adhesive,

A peeling step of peeling the first polarizing film (131) from the first carrier film (12) while folding back the first carrier film (12) conveyed by the carrier film transport step;

The first polarizing film 131 and the second polarizing film 131 are bonded to the liquid crystal cell P from the starting point of the bonding of the first polarizing film 131 to the end of the bonding completion of the bonding, The joining speed for the cell P is set to be faster than the conveying speed of the first carrier film 12 and a period in which the joining speed and the conveying speed coincide after the middle point of time is provided, The first polarizing film 131 peeled off from the first carrier film 12 in the peeling step is peeled off from the first polarizing film 131 in the peeling step while the liquid crystal cell P is being conveyed, And joining to the liquid crystal cell (P) to form an optical display panel.

The bonding step is performed so that a period (area) in which the bonding speed is set to be larger than the conveying speed of the first carrier film 12 is 1 / 2 or less. Further, in the joining step, the joining speed is greater than zero from the joining start time to the joining completion time, and the conveying speed of the carrier film 12 is zero before the joining is completed.

When the polarizing film 131 is bonded to the other substrate of the liquid crystal cell P, the liquid crystal cell P has a pivoting step of rotating and vertically inverting the liquid crystal cell P. The pivoting step is a step of horizontally rotating and vertically inverting the liquid crystal cell P to which the first polarizing film 131 is bonded by 90 degrees. Further, as the pivoting process, the liquid crystal cell P may be reversed about one axis which is not parallel to either the long side or the short side so that the positional relationship between the long side and the short side of the liquid crystal cell P is reversed. The second bonding step for bonding the second polarizing film is the same as the first bonding step. That is, in the first bonding step, the first optical film is bonded to the first surface of the optical cell in the first bonding direction, and in the second bonding step, in the second bonding direction The second optical film is bonded to the second surface of the optical cell.

<Other Embodiments>

In the above embodiment, the laminated optical films unwound from the rolls are cut at predetermined intervals (half cut), but the present invention is not particularly limited to this configuration. For example, a laminated optical film that has been loosened from a roll may be subjected to defect inspection and cut (so-called skip cut) so as to avoid defects based on the inspection result. It is also possible to read the defect information previously given to the laminated optical film, and to cut off defects based on the defect information. The defect information may be marked so that the defect position can be known.

In the above embodiment, the joining process is started after the first polarizing film has once reached the joining position, but such a process may be omitted.

Further, the first polarizing film of the first roll may be previously cut and formed on the first carrier film. That is, as the first roll, a roll of a so-called perforated line insertion laminated optical film may be used. In this case, since the first cutting means and the second cutting means are unnecessary, the tact time can be shortened. The second roll may be a roll of the perforated line insertion laminated optical film like the first roll.

In the above embodiment, the optical film is bonded to both surfaces of the optical cell, but the optical film may be bonded only to one surface of the optical cell.

<Examples>

In the continuous manufacturing system of Fig. 1, a polarizing film (VEG1724DU manufactured by Nitto Denka Kogyo K.K.) was placed between a non-alkali glass substrate (Corning) on one side of a rectangular liquid crystal cell in which a liquid crystal layer was sealed In the direction of the long side from the short side, and then joined to the other side in the short side direction from the long side. In the examples and the comparative examples, the bonding speed V2 and the winding speed V1 (conveying speed of the carrier film) were set as follows and bonded.

In Example 1, at the start of bonding, the winding roller and the first driving roller were simultaneously rotated to start bonding. The winding speed V1 <the bonding speed V2 from the bonding start time T1 to the middle time point T3 and V1 = V2 from the beginning of the bonding after the time point T3 in the middle to the bonding end. The speed conditions of Example 1 are shown in FIG. 4A. In addition, the joining time for one side (first time) and for the other side (second time) were different, but the point was appropriately adjusted.

The second embodiment is the same as the first embodiment except that the speed condition of V1 < V2 is set even in the initial region. The speed conditions of Example 2 are shown in FIG. 4B.

The third embodiment is the same as the first embodiment except that the speed condition of V1 < V2 is set also in the initial region and the middle-term rise. The speed conditions of Example 3 are shown in Figure 4c.

The fourth embodiment is similar to the first embodiment except that the speed condition is set to V1 < V2 even in the initial region, the middle-term acceleration and the middle region. The speed conditions of Example 4 are shown in Fig.

In the fifth embodiment, V1 < V2 is set in the initial region and mid-term rise, V1 > V2 is set in the middle period from the time T3, This is similar to the example 1. The velocity conditions of Example 5 are shown in Figure 4e.

In Comparative Example 1, V1 = V2 was set from the start of bonding to the end of bonding. The speed conditions of Comparative Example 1 are shown in Fig.

In Comparative Example 2, V1 < V2 was set from the start of bonding to the end of bonding. The speed condition of Comparative Example 2 is shown in Fig. 5B.

The presence or absence of bubbles in the front portion between the polarizing film and the liquid crystal cell after the bonding (the portion to be bonded at the beginning of the bonding) and the warpage of the liquid crystal display panel were evaluated by visual inspection.

In Examples 1 to 5, bubble defects and warp defects were not present. In Comparative Example 1, however, since V1 = V2 in all the periods, bubble defects were observed particularly in the front portion of the optical film. In Comparative Example 2, V1 &Lt; V2, the liquid crystal display panel showed defective deflection.

11: First laminated optical film
12: first carrier film
131: first polarizing film (an example of optical film)
30: 1st dancer roll
40: First peel portion
50a: first joining roller
50b: first drive roller
60: Book 1 Installation
60a: take-up roller
101: First carrier film conveying section
102: first liquid crystal cell conveying part
103: first connection
110: first drive control section
P: Liquid crystal cell (example of optical cell)
Y: liquid crystal display panel (an example of the optical display panel)

Claims (4)

A carrier film transporting step of transporting a carrier film in which an optical film containing a pressure sensitive adhesive is laminated via the pressure sensitive adhesive,
A peeling step of peeling the optical film from the carrier film by folding back the carrier film conveyed by the carrier film conveying step inward;
The joining speed of the optical film with respect to the optical cell is lower than the joining speed of the optical film with respect to the optical cell from the start point of the joining to the optical cell until the joining completion point The carrier speed of the carrier film is set to be larger than the conveyance speed of the carrier film, and a period in which the bonding speed coincides with the conveying speed is provided after the middle point of time, or a period in which the conveying speed is higher than the bonding speed, And a bonding step of bonding the optical film peeled off from the carrier film in the peeling step to the optical cell via the adhesive to form an optical display panel. The method according to claim 1, wherein the joining step comprises a first joining step of joining the first optical film to the first surface of the optical cell in the first joining direction, and a second joining step of joining the first optical film to the first surface of the optical cell, And a second bonding step of bonding the second optical film to the second surface of the optical cell in the direction of the first bonding. 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 unit folded back with the carrier film conveyed by the carrier film conveying unit inward to peel off the optical film from the carrier film;
A bonding portion for carrying the optical cell and bonding the optical film peeled off from the carrier film in the peeling portion to the optical cell via the adhesive to form an optical display panel;
The bonding speed of the optical film with respect to the optical cell is lower than the bonding speed between the optical film and the optical cell until the bonding time between the beginning of the bonding of the optical film to the optical cell and the completion of bonding The bonding portion is driven so as to provide a period in which the bonding speed and the conveying speed coincide with each other or a period during which the conveying speed is higher than the bonding speed, And a drive control section for driving and controlling the carrier film conveyance section. The optical element according to claim 3, wherein the bonding portion includes a first bonding portion for bonding the first optical film to the first surface of the optical cell in the first bonding direction, and a second bonding portion for bonding the first optical film to the first surface in the second bonding direction And a second joint joining the second optical film to the second surface of the optical cell.

Images