JP5868734B2 - Optical display panel continuous manufacturing method and optical display panel continuous manufacturing system - Google Patents

Description

  The present invention relates to an optical display panel continuous manufacturing method 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.

  From the carrier film, the carrier film on which the optical film is formed via the adhesive is turned inside by the peeling means while the rotation speed of the winding roll and the bonding roll of the carrier film is synchronized and the same speed. A continuous manufacturing system of an optical display panel is known in which an optical film is peeled together with an adhesive, and the peeled optical film is continuously bonded to an optical cell via the adhesive (see, for example, Patent Document 1).

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

JP 2004-338408 A JP 2011-197280 A

  However, in Patent Document 1, there is a concern that bubbles may be generated between the optical cell and the optical film due to instability of device control, etc., particularly in the initial stage of bonding.

  On the other hand, in Patent Document 2, the optical film is bonded to the optical cell while a strong tension is always applied to the optical film, and the tension applied to the optical film increases over the entire bonding process. There is a concern that the optical display panel after alignment is warped.

  The present invention has been made in view of the above problems, and suppresses warpage of the optical display panel after bonding while reducing bubble defects that are likely to occur between the optical cell and the optical film in the initial stage of bonding. An optical display panel continuous manufacturing method and an optical display panel continuous manufacturing system are provided.

  As a result of intensive studies to solve the above problems, a speed difference (bonding speed> conveying speed) between the bonding speed of the optical film to the optical cell and the conveying speed of the carrier film in the initial stage of bonding. By setting and then setting a period to synchronize (match) the bonding speed and the conveyance speed of the carrier film, or a period in which the conveyance speed is larger than the bonding speed, the generation of bubbles and the warpage of the optical display panel can be prevented. It was found that it can be suppressed.

The continuous manufacturing method of the optical display panel of the present invention is as follows.
A carrier film transporting step for transporting a carrier film in which an optical film containing an adhesive is laminated via the adhesive;
A peeling step of peeling the optical film from the carrier film by folding the carrier film conveyed by the carrier film conveying step inside;
The bonding speed of the optical film to the optical cell is the optical speed until the intermediate point between the bonding start time at which the optical film is bonded to the optical cell and the bonding completion time at which the bonding is completed. It is set so as to be larger than the conveyance speed of the carrier film from which the film has been peeled off, and after the intermediate point, a period in which the bonding speed coincides with the conveyance speed is provided or the conveyance speed is the bonding set to provide a larger period than the speed, while conveying the optical cell, the optical the optical film peeled from the carrier film by the peeling process by laminating the optical cell through the pressure-sensitive adhesive A bonding step of forming a display panel.

  In this configuration, by setting the speed difference (carrier film transport speed <bonding speed) at the initial stage of bonding, where fluctuations such as the carrier film conveyance speed are likely to occur, the initial bonding stability can be achieved. Generation of bubbles can be suppressed. Moreover, the tension | tensile_strength applied to an optical film over the whole bonding process by providing the period when a bonding speed and a conveyance speed correspond in a subsequent bonding period, or providing the period when a conveyance speed becomes larger than a bonding speed. Therefore, it is possible to prevent warping of the optical display panel.

  As one Embodiment of the said invention, the said bonding process is a 1st bonding direction, the 1st bonding process which bonds the 1st optical film to the 1st surface of the said optical cell, and the said 1st bonding direction. A second bonding step in which the second optical film is bonded to the second surface of the optical cell in a second bonding direction, which is a direction perpendicular to the first direction.

  In this configuration, the optical film bonded to one surface and the optical film bonded to the other surface are orthogonal to each other in the direction in which the shrinkage stress caused by the tension at the time of bonding is applied. Can not. Even in such a case, according to the present invention, since the shrinkage stress itself of the optical film is reduced, the warp of the optical display panel can be suitably suppressed.

  As one embodiment of the above invention, in the initial stage of bonding in the middle of the bonding completion time from the bonding start time to the completion of bonding, the carrier film transport speed is zero, and the bonding speed is greater than zero. It may be.

  As one embodiment of the invention, the period (region) in which the pasting speed is set faster than the transport speed of the carrier film depends on the dimensions of the optical film, for example, the optical film to the optical cell. It is preferably 2/3 or less of the pasting length, more preferably 1/2 or less, and even more preferably 1/3 or less.

  With this configuration, in the half or less of the bonding area of the optical cell (bonding initial stage), the bubble generation at the initial bonding stage is improved by setting the bonding speed to be higher than the conveying speed of the carrier film, and thereafter Warpage of the optical display panel can be improved by providing a period in which the bonding speed and the conveyance speed of the carrier film coincide with each other in a wide bonding area, or providing a period in which the conveyance speed is greater than the bonding speed.

  As one Embodiment of the said invention, the said bonding process is a structure from which the said bonding speed is larger than zero from the said bonding start time to the said bonding completion time, and the said carrier film before the said completion of bonding. This is a configuration in which the transport speed is zero.

  In this configuration, the bonding completion can be stably performed by increasing the bonding speed from zero from the bonding start time to the bonding completion time. Moreover, the conveyance speed of a carrier film is made into zero before completion of bonding, and the entrainment of the optical film bonded with an optical cell next can be prevented.

Moreover, the continuous manufacturing system of the optical display panel of another invention is as follows.
A carrier film transport unit that transports a carrier film in which an optical film containing an adhesive is laminated via the adhesive;
A peeling part for turning the carrier film conveyed by the carrier film conveying part inside and peeling the optical film from the carrier film;
While transporting the optical cell, a bonding portion that forms an optical display panel by bonding the optical film peeled from the carrier film at the peeling portion to the optical cell via the adhesive,
Until the intermediate point between the start of bonding and the completion of bonding until the completion of bonding, the bonding speed of the optical film to the optical cell is as described above. It becomes larger than the conveyance speed of the carrier film from which the optical film has been peeled off, and after the halfway point, a period in which the lamination speed and the conveyance speed coincide with each other is provided or the conveyance speed is larger than the lamination speed. A drive control unit that drives and controls the laminating unit and drives and controls the carrier film transport unit so as to provide a period.

  In this configuration, by setting the speed difference (carrier film transport speed <bonding speed) at the initial stage of bonding, where fluctuations such as the carrier film conveyance speed are likely to occur, the initial bonding stability can be achieved. Generation of bubbles can be suppressed. Moreover, the tension | tensile_strength applied to an optical film over the whole bonding process by providing the period when a bonding speed and a conveyance speed correspond in a subsequent bonding period, or providing the period when a conveyance speed becomes larger than a bonding speed. Therefore, it is possible to prevent warping of the optical display panel.

  As one Embodiment of the said invention, the said bonding part is a 1st bonding direction, the 1st bonding part which bonds the 1st optical film to the 1st surface of the said optical cell, and the said 1st bonding direction, It has the 2nd bonding part which bonds the 2nd optical film on the 2nd surface of the above-mentioned optical cell by the 2nd bonding direction which is an orthogonal direction.

  In this configuration, the optical film bonded to one surface and the optical film bonded to the other surface are orthogonal to each other in the direction in which the shrinkage stress caused by the tension at the time of bonding is applied. Can not. Even in such a case, according to the present invention, since the shrinkage stress itself of the optical film is reduced, the warp of the optical display panel can be suitably suppressed.

  As one embodiment of the invention, the period (region) in which the pasting speed is set faster than the transport speed of the carrier film depends on the dimensions of the optical film, for example, the optical film to the optical cell. It is preferably 2/3 or less of the pasting length, more preferably 1/2 or less, and even more preferably 1/3 or less.

As one embodiment of the invention, the drive control unit is
From the bonding start time to the bonding completion time, the bonding part is driven and controlled so that the bonding speed is greater than zero, and the carrier film transport speed is zero before the bonding is completed. It is preferable to drive-control the carrier film transport unit.

As one embodiment of the invention, the drive control unit is
Immediately before the next bonding start time point, it is preferable to drive-control the bonding part and drive-control the carrier film conveying part so that the bonding speed and the conveyance speed of the carrier film become zero.

As one embodiment of the invention, the bonding unit includes a bonding roller that presses the optical film against the optical cell surface, and a receiving roller that is disposed to face the bonding roller. Bonding the optical film to the optical cell surface while conveying the optical film and the optical cell while sandwiching the optical film between the combining roller and the receiving roller,
The drive control unit drives and controls the bonding roller and / or the receiving roller.

  As one embodiment of the above invention, the carrier film transport unit is arranged on the upstream side of the peeling unit and upstream of the upstream film supply unit (feed roller) that transports the belt-like carrier film and / or on the downstream side of the peeling unit. A downstream film supply unit (feed roller) that is disposed and conveys the belt-like carrier film, and the drive control unit conveys the carrier film, the upstream film supply unit and / or the downstream film supply unit Is controlled.

  As one embodiment of the invention, the carrier film transport unit is configured to include a winding unit that winds up the carrier film after the optical film is peeled off, and the drive control unit transports the carrier film. The drive of the winding unit is controlled. In addition, the carrier film transport unit may include one or more of an upstream film supply unit, a downstream film supply unit, and a winding unit.

Schematic which showed an example of the continuous manufacturing system of an optical display panel. The figure for demonstrating operation | movement of a drive control part. The figure for demonstrating operation | movement of a drive control part. The figure for demonstrating operation | movement of a drive control part. The figure for demonstrating operation | movement of a drive control part. The figure for demonstrating operation | movement of a drive control part. The figure which shows the speed relationship between the bonding speed | velocity | rate and winding speed of embodiment. FIG. 3 is a diagram illustrating speed conditions according to the first embodiment. FIG. 6 is a diagram illustrating speed conditions of the second embodiment. FIG. 6 is a diagram illustrating speed conditions of Example 3. FIG. 6 is a diagram illustrating speed conditions of Example 4. FIG. 10 is a diagram illustrating speed conditions of Example 5. The figure which shows the speed conditions of the comparative example 1. The figure which shows the speed conditions of the 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, you may be comprised by what was wound by roll shape. Examples of the roll include a roll of a laminated optical film having (1) a carrier film and a belt-like optical film formed on the carrier film via an adhesive. In this case, in order to form the optical film from the belt-shaped optical film, the continuous production system of the optical display panel leaves the carrier film without cutting and cuts the belt-shaped optical film and the adhesive at predetermined intervals (lamination). It has a cutting part for half-cutting an optical film.

  Moreover, as a roll, for example, a roll of a laminated optical film having (2) a carrier film and an optical film formed on the carrier film via an adhesive (a roll of a so-called cut laminated optical film) ). Examples of the optical film include a polarizing film, a brightness enhancement film, a retardation film, and an optical film in which two or more of these are laminated.

  For example, the 1st roll 1 shown in FIG. 1 rolls the 1st laminated | multilayer optical film 11 which has the 1st carrier film 12 and the 1st polarizing film (an example of an optical film) 13 laminated | stacked on the 1st carrier film 12. It is wrapped around. The first polarizing film 13 has a film body 13a and an adhesive layer 13b.

  Examples of the polarizing film include a polarizer (thickness is about 1.5 to 80 μm) and a polarizer protective film (thickness is generally about 1 to 500 μm) on one or both sides of the polarizer as an adhesive or an adhesive. Formed without. As another film constituting the first laminated optical film 11, for example, a retardation film (thickness is generally 10 to 200 μm) such as a λ / 4 plate and a λ / 2 plate, a viewing angle compensation film, a brightness enhancement film, A surface protective film etc. are mentioned. As for the thickness of a laminated optical film, the range of 10 micrometers-500 micrometers is mentioned, for example. The pressure-sensitive adhesive interposed between the polarizing film and the carrier film is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a urethane pressure-sensitive adhesive. The layer thickness of the pressure-sensitive adhesive is preferably in the range of 10 μm to 50 μm, for example. Examples of the peeling force between the pressure-sensitive adhesive and the carrier film include 0.15 (N / 50 mm width sample), but are not particularly limited thereto. The peeling force is measured according to JIS Z0237.

  As the carrier film, for example, a conventionally known film such as a plastic film (for example, a polyethylene terephthalate film, a polyolefin film, or the like) can be used. In addition, if necessary, an appropriate material according to the prior art such as a silicone-based, long-chain alkyl-based, fluorine-based or molybdenum sulfide-coated material may be used.

  In the 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 drive circuit is incorporated as necessary. Examples of the optical cell include a liquid crystal cell and an organic EL cell. As the liquid crystal cell, for example, an arbitrary type such as a vertical alignment (VA) type or an in-plane switching (IPS) type can be used. As the organic EL cell, for example, an arbitrary type such as a top emission method, a bottom emission method, a double emission method, or the like can be used. The liquid crystal cell P shown in FIG. 1 has a configuration in which a liquid crystal layer is sealed between a pair of substrates (a first substrate Pa and a second substrate Pb) arranged to face each other.

<Embodiment 1>
Hereinafter, a continuous production system for an optical display panel according to the present embodiment will be specifically described 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 example of an optical cell, and a polarizing film will be described as an example of 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 an optical display panel continuous manufacturing system, and FIG. 2 is a diagram for explaining the operation of a drive control unit. FIG. 3 is a diagram showing a speed relationship between the bonding speed and the winding speed.

  The continuous manufacturing system of the optical display panel which concerns on this embodiment is the 1st carrier film conveyance part 101, the 1st peeling part 40, the 1st liquid crystal cell conveyance part 102, and the 1st bonding part 103 (1st bonding). Roll 50a, first drive roll 50b), first drive control unit 110, second liquid crystal cell transport unit 104, second carrier film transport unit, second peeling unit, and second bonding unit (second A bonding roll, a second drive roll), a second drive control unit, and an optical display panel transport unit. In the present embodiment, the 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 (reversed from front to back, rotated by 90 ° as necessary) to move the upper side of the liquid crystal cell. The polarizing film may be bonded from the lower side of the liquid crystal cell, the polarizing film may be reversed 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. A polarizing film may be bonded from the lower side of the liquid crystal cell without attaching the film and the liquid crystal cell being inverted, and an upper side of the liquid crystal cell may be bonded without attaching the polarizing film from the lower side of the liquid crystal cell. Alternatively, a polarizing film may be attached.

  The 1st liquid crystal cell conveyance part 102 supplies the liquid crystal cell P to the 1st bonding part 103, and conveys it. In the present embodiment, the first liquid crystal cell transport unit 102 includes a transport roller unit 80 and a suction plate. The liquid crystal cell P is transported downstream of the production line by rotating the transport roller 80 or by transferring the suction plate. In the bonding process of the 1st polarizing film 131, the 1st liquid crystal cell conveyance part 102 is controlled by the 1st drive control part 110 mentioned later, and conveys the liquid crystal cell P to the bonding position of the 1st bonding part 103. FIG.

  The 1st carrier film conveyance part 101 conveys the 1st carrier film 12 with which the strip | belt-shaped 1st polarizing film containing an adhesive is laminated | stacked through the said adhesive. In this embodiment, the 1st carrier film conveyance part 101 unwinds the 1st lamination | stacking optical film 11 from the 1st roll 1, cut | disconnects a strip | belt-shaped 1st polarizing film at predetermined intervals, and makes the 1st polarizing film 131 a 1st carrier. It has the 1st cutting part 20 for forming on the film 12. FIG. The polarizing film 131 is peeled off from the first carrier film by the first peeling portion 40 described later and supplied to the first bonding portion 103. For this purpose, the first carrier film transport unit 101 includes a first cutting unit 20, a first dancer roll 30, and a first winding unit 60. The first carrier film transport unit 101 has a feed roll (not shown) that transports the first carrier film 12 (first laminated optical film 11) to the transport upstream side or transport downstream side of the first peeling unit 40. You may do it.

  The first cutting unit 20 cuts the strip-shaped first polarizing film into a size corresponding to the liquid crystal cell P while fixing the first laminated optical film 11 from the first carrier film 12 side by the adsorption unit 21, A first polarizing film 131 is formed on the carrier film 12. Examples of the first cutting unit 20 include a cutter and a laser device.

  The first dancer roll 30 (corresponding to a tension adjusting unit) has a function of maintaining the tension of the first carrier film 12 in each process such as a conveyance process and a bonding process. The first dancer roll 30 can more reliably apply tension to the first polarizing film 131 from the initial stage of bonding. The first carrier film transport unit 101 transports the first carrier film 12 via the first dancer roll 30.

  When the first polarizing film 131 is bonded to the liquid crystal cell P, the first peeling portion 40 is folded back with the first carrier film 12 inside at the tip, and the first polarizing film 131 (adhesive) (Including the agent). In the present embodiment, the first peeling portion 40 uses a sharp knife edge portion at the tip, but is not limited thereto.

  The first winding unit 60 includes a winding roller 60a, and winds the first carrier film 12 from which the first polarizing film 131 has been peeled off on the winding roller 60a. In this embodiment, in the bonding period (process) of the 1st polarizing film 131, the winding speed V1 (t) of the 1st carrier film 12 by the 1st winding part 60 was the 1st polarizing film 131 peeled. It corresponds to the conveyance speed of the carrier film. The first winding unit 60 is drive-controlled (drive start, stop, rotation speed, etc.) by a first drive control unit 110 described later. For example, the first drive control unit 110 controls the motor M1 that rotationally drives the winding roller 60a of the first winding unit 60.

  The 1st bonding part 103 bonds the 1st polarizing film 131 peeled from the 1st carrier film 12 to the liquid crystal cell P via an adhesive, conveying the liquid crystal cell P, and forms an optical display panel. In this embodiment, the 1st bonding part 103 is comprised by the 1st bonding roller 50a and the 1st drive roller (receiving roller) 50b. In the bonding period (process) of the first polarizing film 131, the rotation speed of the first drive roller 50b corresponds to the bonding speed V2 (t), and the first drive roller 50b is driven by the drive control unit 110 described later. Control (drive start, stop, rotation speed, etc.) is performed. In addition, although it is a mechanism in which the 1st bonding roller 50a follows according to the drive of the 1st drive roller 50b, it is not restrict | limited to this, The mechanism in which a drive and a follow are reverse may be sufficient, and both are drive mechanisms. Also good. For example, the first drive control unit 110 controls the motor M2 that rotationally drives the first drive roller 50b.

  The first polarizing film 131 is fed to the bonding position Q by winding the first carrier film 12 by the first winding unit 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 bonding roller 50a, and the first polarizing film 131 is bonded to the liquid crystal cell surface simultaneously with the conveyance.

  At this time, the first polarizing film 131 is fed by the first winding unit 60 (or the feed roller) and is drawn by being sandwiched between the first driving roller 50b and the first laminating roller 50a. Has occurred. That is, when the pulling action (bonding speed V2) is larger than the feeding action (winding speed V1 or the conveying speed by the feed roller), warpage occurs in the liquid crystal display panel after bonding due to the increase in tension. On the other hand, in the opposite case, the first polarizing film 131 is bent and fluttered, and there is a concern that bubble defects may occur in the initial stage of bonding. Then, in this embodiment, the said subject is solved by controlling the 1st winding part 60 (winding speed V1) and the 1st bonding part 50 (bonding speed V2) as follows.

  The 1st drive control part 110 controls the above-mentioned 1st winding part 60 and the 1st drive roll 50b, respectively, and the winding speed V1 of the 1st carrier film 12 in the bonding process period of the 1st polarizing film 131 ( The carrier film conveyance speed, the polarizing film feeding speed), and the bonding speed V2 (the liquid crystal cell conveyance speed, the polarizing film drawing speed) for bonding the first polarizing film 131 to the liquid crystal cell P are controlled. In FIG. 3, it shows about the speed relationship of the winding speed V1 in the whole period of a bonding process, and the bonding speed V2.

  In FIG. 3, during the peeling start period, the leading edge of the first polarizing film 131 starts to peel from the first carrier film 12 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 winding roller 60a or by a feed roller on the upstream side or the downstream side of the first peeling unit 40. The first polarizing film 131 reaches the bonding position Q and temporarily stops feeding (the winding roll 60a is stopped (see FIG. 2B, V1 = 0)).

  Then, the bonding process is started. In the initial stage of bonding, the winding roll 60a, the first drive roller 50b, and the first bonding roller 50a are rotated at the bonding start time T1 (and also the winding start time T2). The bonding speed V2 of the first polarizing film 131 to the liquid crystal cell P is from the first carrier film 12 until the time T3 in the middle between the bonding start time T1 and the bonding completion time T5. It is set larger than the winding speed V1 (V2> V1> 0). After this halfway point (time point at which the speeds are synchronized) T3, the bonding speed V2 and the winding speed V1 are matched (V2 = V1). The first polarizing film 131 and the liquid crystal cell P are conveyed while being sandwiched between rolls of the first driving roller 50b and the first bonding roller 50b, and the first polarizing film 131 is bonded to the surface of the liquid crystal cell P (see FIG. 2C). .

  Next, the winding speed V1 and the bonding speed V2 are also matched in the middle stage of bonding (V1 = V2). Then, at the final stage of bonding, the first polarizing film 131 bonded at the present time is completely peeled off from the first carrier film 12, and then wound at a speed difference generation time T4 in order to stop the winding roll 60a. The take-up speed V1 is decelerated and the rotation of the take-up roll 60a is stopped before the bonding is completed (V1 = 0, see FIG. 2D). Then, bonding of the 1st polarizing film 131 to liquid crystal cell P is completed, decelerating rotation of the 1st drive roll 50b (bonding speed is reduced) (refer to bonding completion time T5 and Drawing 2E). After the bonding is completed, the rotation of the first drive roll 50b is stopped (V2 = 0). Then, it moves to the next bonding preparation.

  Moreover, in the above, it has the relationship of the bonding speed V2> winding speed V1 from the bonding start time T1 to the middle time T3, and the 1st polarizing film 131 is bonded to the liquid crystal cell P at this speed relationship. The period (area) to be applied is 1/2 or less of the bonding length.

  Moreover, it is preferable that the 1st drive control part 110 controls drive so that it may become a speed relationship of V2> V1 at least just before the completion of bonding.

  Moreover, the 1st drive control part 110 carries out drive control of the 1st drive roller 50b from pasting start time T1 to pasting completion time T5 so that pasting speed V2 may become larger than zero, and before pasting completion The winding roll 60a of the first winding unit 60 is driven and controlled so that the winding speed V1 is zero. The first drive control unit 110 winds the first drive roller 50b and the first winding unit 60 so that V2 (t) = 0 and V1 (t) = 0 immediately before the next bonding start time. The roll 60a is driven and controlled.

  Further, the first drive control unit 110 replaces the first winding unit 60 (or in addition to the first winding unit 60), and is upstream of the first winding unit 60 on the downstream side of the first peeling unit 40. You may comprise so that the conveyance speed of the 1st carrier film 12 may be controlled by controlling the feed roller (not shown) installed in the side.

  In addition to the first winding unit 60, the first drive control unit 110 controls a feed roller (not shown) installed upstream of the first peeling unit 40 to control the first carrier film. You may comprise so that the conveyance speed of 12 may be controlled.

  The first drive control unit 110 may be configured by a dedicated device or a dedicated circuit, may be configured by a cooperative action of a computer and a program that executes each of the above control procedures, or configured by firmware. May be.

  In the above embodiment, the bonding speed V2> the winding speed V1 from the bonding start time T1 to the intermediate time T3, and after the intermediate time T3, the bonding speed V2 and the winding speed V1 are set. It was the structure which provided the period which corresponds. As another embodiment, the winding conveyance speed V1 is higher than the bonding speed V2 in the relationship of the bonding speed V2> the winding speed V1 from the bonding start time T1 to the intermediate time T3 and after the intermediate time T3. The structure which provides may be sufficient.

(Second liquid crystal cell transfer unit)
The 2nd liquid crystal cell conveyance part 104 conveys the liquid crystal cell P with which the 1st polarizing film 131 was bonded by the 1st bonding part 103, and supplies it to a 2nd bonding part. The second liquid crystal cell transport unit 104 includes a rotation mechanism (not shown) for horizontally rotating the liquid crystal cell P to which the first polarizing film 131 is bonded by 90 °, and the liquid crystal cell P to which the first polarizing film 131 is bonded. Is provided with a reversing mechanism for vertically reversing. That is, in the 1st bonding part 103, the 1st polarizing film 131 is bonded to the 1st surface of the liquid crystal cell P by the 1st bonding direction, and in this 2nd bonding part, the direction orthogonal to a 1st bonding direction. The second polarizing film is bonded to the second surface of the liquid crystal cell P in the second bonding direction.

  As described above, the various means and devices described above can be used as various means for attaching the polarizing film to the other surface of the liquid crystal cell P. A 2nd carrier film conveyance part can be comprised with the apparatus similar to a 1st carrier film conveyance part, and a 2nd bonding part can be comprised with the apparatus similar to a 1st bonding part. For example, the second dancer roll can be configured with the same device as the first dancer roll 30, the second winding unit can be configured with the same device as the first winding unit 60, the second laminating roller and the second driving roller. Can be configured by the same mechanism as the first laminating roller 50a and the first driving roller 50b. The second drive control unit is configured to have the same function as the first drive control unit 110.

  The optical display panel transport unit (not shown) can be composed of a transport roller, a suction plate, etc., and transports the liquid crystal display panel Y produced by the second bonding unit downstream. An inspection device for inspecting the liquid crystal display panel Y may be installed on the downstream side of the conveyance. The inspection purpose and inspection method of this inspection apparatus are not particularly limited.

(Continuous manufacturing method)
The continuous manufacturing method of the optical display panel which concerns on this embodiment is a carrier film conveyance process which conveys the 1st carrier film 12 by which the 1st polarizing film 131 containing an adhesive is laminated | stacked through the said adhesive,
A peeling step in which the first polarizing film 131 is peeled off from the first carrier film 12 by folding the first carrier film 12 conveyed in the carrier film conveying step inside;
To the liquid crystal cell P of the first polarizing film 131 until the intermediate point between the start of bonding and the completion of bonding after the first polarizing film 131 is bonded to the liquid crystal cell P. Is set faster than the conveying speed of the first carrier film 12, and after the intermediate point, a period in which the bonding speed coincides with the conveying speed is provided or the conveying speed is The first polarizing film 131 peeled off from the first carrier film 12 in the peeling step is set via the pressure-sensitive adhesive while the liquid crystal cell P is transported while being set to provide a period that is greater than the bonding speed. And a bonding step of forming an optical display panel by bonding to the liquid crystal cell P.

  In the pasting step, the period (region) set so that the pasting speed is higher than the transport speed of the first carrier film 12 is the length of the pasting of the polarizing film 131 to the liquid crystal cell P. 1/2 or less. Moreover, the said bonding process WHEREIN: The said bonding speed is larger than zero from the said bonding start time to the said bonding completion time, and the conveyance speed of the said carrier film 12 is zero before the said bonding completion.

  In addition, when the polarizing film 131 is bonded to the other substrate of the liquid crystal cell P, the liquid crystal cell P has a turning process of rotating and upside down. The turning step is a step in which the liquid crystal cell P to which the first polarizing film 131 is bonded is horizontally rotated 90 ° and turned upside down. In the turning process, the liquid crystal cell P may be inverted about one axis that 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. And the 2nd bonding process of bonding a 2nd polarizing film is the same as said 1st bonding process. 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 the second bonding step is a direction orthogonal to the first bonding direction. The second optical film is bonded to the second surface of the optical cell in the two bonding directions.

<Another embodiment>
In the above embodiment, the laminated optical film fed from the roll is cut (half cut) at a predetermined interval, but the present invention is not particularly limited to this configuration. For example, the laminated optical film fed out from the roll may be inspected for defects and cut (so-called skip cut) so as to avoid the defects based on the inspection results. Moreover, the defect information previously attached | subjected to the laminated optical film may be read, and it may cut | disconnect so that a defect may be avoided based on the said defect information. The defect information may be marked so that the position of the defect can be understood.

  Moreover, in the said embodiment, after making the 1st polarizing film reach a bonding position once, the bonding process was started, but such a process may be abbreviate | omitted.

  Moreover, the 1st polarizing film of the 1st roll may be cut | disconnected previously, and may be formed in the 1st carrier film. That is, a roll of a so-called cut laminated optical film may be used as the first roll. In this case, the first cutting means and the second cutting means are not necessary, and the tact time can be shortened. Similarly to the first roll, the second roll may be a roll of a laminated optical film with cuts.

  Moreover, in the said embodiment, although the optical film was bonded on both surfaces of the optical cell, you may bond an optical film only on the single side | surface of an optical cell.

<Example>
In the continuous production system of FIG. 1, a liquid crystal layer is sealed on one side of a non-alkali glass substrate (manufactured by Corning) on which a polarizing film (VEG1724DU manufactured by Nitto Denko Corporation) is opposed. The substrate was bonded along the long side direction from the short side, and then bonded to the other side along the short side direction from the long side. In Examples and Comparative Examples, the bonding speed V2 and the winding speed V1 (carrier film transport speed) were set as follows and bonded together.

  In Example 1, at the start of bonding, the winding roller and the first drive roller were simultaneously rotated to start bonding. The winding speed V1 <the bonding speed V2 from the bonding start time T1 to the intermediate time T3, and V1 = V2 from the initial bonding to the final bonding after the intermediate time T3. The speed condition of Example 1 is shown in FIG. 4A. In addition, although the bonding time was different between the bonding to one side (first time) and the bonding to the other side (second time), this point was appropriately adjusted.

  The second embodiment is the same as the first embodiment except that the speed condition of V1 <V2 is set also in the initial region. The speed condition of Example 2 is 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 period rising. The speed condition of Example 3 is shown in FIG. 4C.

  The fourth embodiment is the same as the first embodiment except that the speed condition of V1 <V2 is set also in the initial region, the middle period rising time, and the middle period region. The speed condition of Example 4 is shown in FIG. 4D.

  Example 5 is the same as Example 1 except that V1 <V2 in the initial region and mid-term rise, V1> V2 for a certain period from time T3 in the middle region, and then V1 = V2. It is. The speed condition of Example 5 is shown in FIG. 4E.

  In Comparative Example 1, V1 = V2 was set from the start of bonding to the end of bonding. The speed condition of Comparative Example 1 is shown in FIG. 5A.

  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 air bubbles in the front part between the polarizing film and the liquid crystal cell after bonding (the part bonded at the initial stage of bonding) and the warpage of the liquid crystal display panel were evaluated by visual inspection.

  In Examples 1 to 5, there were no bubble defects and warp defects. However, in Comparative Example 1, V1 = V2 was set for the entire period, so that bubble defects were observed particularly in the front portion of the optical film. Since V1 <V2 was satisfied during the period, the liquid crystal display panel showed a warp defect.

11 First laminated optical film 12 First carrier film 131 First polarizing film (an example of an optical film)
30 1st dancer roll 40 1st peeling part 50a 1st bonding roller 50b 1st drive roller 60 1st winding part 60a Winding roller 101 1st carrier film conveyance part 102 1st liquid crystal cell conveyance part 103 1st bonding Unit 110 first drive control unit P liquid crystal cell (an example of an optical cell)
Y liquid crystal display panel (an example of an optical display panel)

Claims (4)

A carrier film transporting step for transporting a carrier film in which an optical film containing an adhesive is laminated via the adhesive;
A peeling step of peeling the optical film from the carrier film by folding the carrier film conveyed by the carrier film conveying step inside;
The bonding speed of the optical film to the optical cell is the optical speed until the intermediate point between the bonding start time at which the optical film is bonded to the optical cell and the bonding completion time at which the bonding is completed. It is set so as to be larger than the conveyance speed of the carrier film from which the film has been peeled off, and after the intermediate point, a period in which the bonding speed coincides with the conveyance speed is provided or the conveyance speed is the bonding set to provide a larger period than the speed, while conveying the optical cell, the optical the optical film peeled from the carrier film by the peeling process by laminating the optical cell through the pressure-sensitive adhesive The continuous manufacturing method of the optical display panel including the bonding process which forms a display panel.   The said bonding process is a 1st bonding direction, and is the 1st bonding process which bonds a 1st optical film to the 1st surface of the said optical cell, and the 2nd bonding which is a direction orthogonal to the said 1st bonding direction. The continuous manufacturing method of the optical display panel of Claim 1 including the 2nd bonding process of bonding a 2nd optical film on the 2nd surface of the said optical cell by a bonding direction. A carrier film transport unit that transports a carrier film in which an optical film containing an adhesive is laminated via the adhesive;
A peeling part for turning the carrier film conveyed by the carrier film conveying part inside and peeling the optical film from the carrier film;
While transporting the optical cell, a bonding portion that forms an optical display panel by bonding the optical film peeled from the carrier film at the peeling portion to the optical cell via the adhesive,
Until the intermediate point between the start of bonding and the completion of bonding until the completion of bonding, the bonding speed of the optical film to the optical cell is as described above. It becomes larger than the conveyance speed of the carrier film from which the optical film has been peeled off, and after the halfway point, a period in which the lamination speed and the conveyance speed coincide with each other is provided or the conveyance speed is larger than the lamination speed. A continuous manufacturing system for an optical display panel, comprising: a drive control unit that drives and controls the laminating unit and drives and controls the carrier film transport unit so as to provide a period of time.   The said bonding part is the 1st bonding direction, and is the 1st bonding part which bonds a 1st optical film to the 1st surface of the said optical cell, and the 2nd bonding which is a direction orthogonal to the said 1st bonding direction. The continuous manufacturing system of the optical display panel of Claim 3 which has a 2nd bonding part which bonds a 2nd optical film to the 2nd surface of the said optical cell in a joining direction.