TW201400933A - Method for continuously producing optical display panel and system for continuously producing optical display panel - Google Patents

Abstract

The present invention suppresses warping of an optical display panel after pasting together while reducing air bubble defects that easily arise between an optical film and an optical cell at the initial period of pasting. The method for continuously producing an optical display panel includes: a carrier film conveyance step wherein a carrier film is conveyed; a peeling step wherein the optical film is peeled from the carrier film; and a pasting step wherein, until a point in time partway from the pasting start time at which the optical film is started to be pasted to the optical cell to the pasting completion time at which the pasting is completed, the pasting speed of the optical film to the optical cell is set in a manner so as to be greater than the speed of conveyance of the carrier film from which the optical film has been peeled, setting is performed in a manner so that after the partway point in time, a period of time is provided during which the speed of pasting and the speed of conveyance match, or a period of time is provided during which the speed of conveyance is greater than the speed of pasting, and the optical film is pasted to the optical cell with an adhesive therebetween while conveying the optical cell, thus forming an optical display panel.

Description

Continuous manufacturing method of optical display panel and continuous manufacturing system of optical display panel

The present invention relates to a continuous manufacturing method and an optical display panel manufacturing system for forming an optical display panel of an optical display panel by bonding an optical film from which a carrier film is peeled off to an optical unit via an adhesive.

There is known a continuous manufacturing system for an optical display panel in which a carrier film formed with an optical film via an adhesive is placed on the inside while the rotation speed of the take-up roll of the carrier film and the bonding roll are synchronized and at the same speed. The optical film is peeled off together with the adhesive from the carrier film, and the peeled optical film is continuously bonded to the optical unit via an adhesive (for example, see Patent Document 1).

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

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2004-338408

[Patent Document 2] Japanese Patent Laid-Open No. 2011-197280

However, in Patent Document 1, there is a concern that bubbles are generated between the optical unit and the optical film due to instability of device control at the initial stage of bonding.

On the other hand, in Patent Document 2, the optical film is bonded to the optical unit while the optical film is always subjected to a strong tension, and the tension applied to the optical film in the entire bonding step is continuously increased. There is a concern that warpage occurs on the optical display panel after bonding.

The present invention has been made in view of the above-mentioned problems, and provides an optical display panel capable of reducing bubble defects which are easily generated between an optical unit and an optical film at the initial stage of bonding, and suppressing warpage of the bonded optical display panel. Continuous manufacturing method and continuous manufacturing system of optical display panel.

In order to solve the above problems, intensive research has been carried out, and as a result, it has been found that a speed difference (bonding speed > transport speed) is set between the bonding speed of the optical film on the optical unit and the transport speed of the carrier film at the initial stage of bonding. Thereafter, a period in which the bonding speed is synchronized with the conveying speed of the carrier film (consistent) or a period in which the conveying speed is greater than the bonding speed is provided, whereby generation of bubbles and occurrence of warpage of the optical display panel can be suppressed.

The continuous manufacturing method of the optical display panel of the present invention comprises the steps of: carrying a film transporting step of transporting a carrier film formed by laminating an optical film containing an adhesive through the adhesive; and a peeling step of passing through the carrier film The carrier film conveyed in the transfer step is folded inside, and the optical film is peeled off from the carrier film; and a bonding step is performed at the bonding start time when the optical film is bonded to the optical unit as described above. The filming speed of the optical film to the optical film is set to be higher than the transport speed of the optical film peeled off by the optical film until the halfway time in the period from the completion of the bonding completion time point, and After the intermediate time point, the optical unit is transported via the adhesive while the optical unit is transported while the bonding speed is set to coincide with the transport speed or when the transport speed is greater than the bonding speed. The optical film peeled off from the carrier film is attached to the optical film by a peeling step The unit forms an optical display panel.

In this configuration, it is possible to achieve a bonding stability at the initial stage of bonding by suppressing the initial speed difference (transporting speed of the carrier film <adhesion speed) due to a change in the conveyance speed of the carrier film or the like. The generation of bubbles. Further, it is possible to prevent the tension applied to the optical film from increasing over the entire bonding step by the period in which the bonding speed is set to coincide with the conveyance speed or the period in which the conveyance speed is larger than the bonding speed in the subsequent bonding period. Therefore, warpage of the optical display panel can be suppressed.

According to an embodiment of the invention, the bonding step includes a first bonding step of bonding the first optical film to the first surface of the optical unit in the first bonding direction, and a second bonding step; The bonding step is to bond the second optical film to the second surface of the optical unit in a second bonding direction which is a direction orthogonal to the first bonding direction.

In this configuration, since the optical film bonded to one surface and the optical film bonded to the other surface are orthogonal to each other due to the tension applied during the bonding, the shrinkage stress cannot be offset from each other. . That is, in the case of such a case, according to the present invention, since the shrinkage stress of the optical film itself is made small, warpage of the optical display panel can be preferably suppressed.

In one embodiment of the invention, the carrier speed of the carrier film is zero and the bonding speed is greater than the initial stage of the bonding time from the time when the bonding is started to the time when the bonding is completed. Zero speed relationship.

In an embodiment of the invention, the setting period (region) in which the bonding speed is higher than the transport speed of the carrier film depends on the size of the optical film, but preferably, for example, the optical film is on the optical unit. The bonding length is 2/3 or less, more preferably 1/2 or less, and still more preferably 1/3 or less.

According to this configuration, by setting one or more of the bonding regions of the optical unit (initial bonding), the bonding speed is set to be higher than the conveying speed of the carrier film, and the generation of bubbles in the initial stage of bonding can be improved, and Post-laying stickers in a wider range of fit areas The warpage of the optical display panel is improved during the period in which the speed is matched with the transport speed of the carrier film or during which the transport speed is set to be higher than the bonding speed.

In one embodiment of the invention, the bonding step is configured such that the bonding speed is greater than zero from the bonding start time point to the bonding completion time point, and the carrier film is configured before the bonding is completed. The transport speed is zero.

In this configuration, the bonding speed can be made greater than zero by the self-adhesive start time point to the bonding completion time point, and the bonding can be stably performed. Further, the transport speed of the carrier film can be made zero before the bonding is completed, thereby preventing the optical film attached to the optical unit from being wound up.

Further, a continuous manufacturing system for an optical display panel according to another aspect of the invention includes: a carrier film transporting unit that transports a carrier film formed by laminating an optical film containing an adhesive via the adhesive; and a peeling portion through which the carrier is to be carried The carrier film conveyed by the film transporting portion is folded inside, and the optical film is peeled off from the carrier film; and the bonding portion transfers the optical unit while the optical unit is transferred from the carrier by the peeling portion via the adhesive. The optical film of the film peeling is bonded to the optical unit to form an optical display panel, and the drive control unit drives and controls the bonding portion as follows, and drives and controls the carrier film conveying unit: The optical film is bonded to the optical unit at a time point from the bonding start time point of the optical unit to the time when the bonding completion time is completed, and the bonding speed of the optical film to the optical unit is greater than the optical a conveying speed of the film which is peeled off by the film, and a period in which the bonding speed is equal to the conveying speed after the intermediate time point is set or The transport speed is greater than the speed during the bonding.

In this configuration, the initial setting speed difference (the transport speed of the carrier film <the bonding speed) due to the change in the transport speed of the carrier film or the like is likely to occur, and the initial bonding can be realized. The stability of the period is combined to suppress the generation of bubbles. Moreover, the period in which the bonding speed is set to match the conveyance speed or the period in which the conveyance speed is larger than the bonding speed is set in the subsequent bonding period, and the tension applied to the optical film is prevented from increasing throughout the bonding step. The warpage of the optical display panel can be suppressed.

In one embodiment of the invention, the bonding unit includes: a first bonding portion that bonds the first optical film to the first surface of the optical unit in the first bonding direction; and a second bonding portion The second optical film is bonded to the second surface of the optical unit in a second bonding direction which is a direction orthogonal to the first bonding direction.

In this configuration, the direction in which the contraction stress is applied due to the tension at the time of bonding is orthogonal to the optical film bonded to one of the optical films and the optical film bonded to the other surface, so that the shrinkage stress cannot be prevented from each other. That is, in this case, according to the present invention, the shrinkage stress of the optical film itself is made small, so that the warpage of the optical display panel can be preferably suppressed.

In one embodiment of the invention, the setting period (region) in which the bonding speed is higher than the transport speed of the carrier film depends on the size of the optical film, but preferably, for example, the optical film is on the optical unit. The bonding length is 2/3 or less, more preferably 1/2 or less, and still more preferably 1/3 or less.

In one embodiment of the invention, the drive control unit preferably drives and controls the bonding unit such that the bonding speed is greater than zero from the bonding start time point to the bonding completion time point. Before the completion of the bonding, the carrier film conveying unit is driven and controlled such that the conveying speed of the carrier film is zero.

According to an embodiment of the invention, it is preferable that the drive control unit drives the control bonding unit and drives the bonding speed and the transport speed of the carrier film to zero before the next bonding start time point. The carrier film conveying unit is controlled.

According to an embodiment of the invention, the bonding unit includes: a bonding roller that presses the optical film to the optical unit surface; and a backup roller that is disposed to face the bonding roller; Holding and transporting the optical film between the bonding roller and the backup roller And the optical unit, wherein the optical film is bonded to the optical unit surface; and the drive control unit drives and controls the bonding roller and/or the support roller.

In one embodiment of the invention, the carrier film conveying unit is disposed on the upstream side of the transporting side of the peeling unit, and conveys the upstream film supply unit (feeding roller) of the belt-shaped carrier film and/or the downstream side of the transporting portion of the peeling unit. The downstream side film supply unit (feeding roller) of the belt-shaped carrier film is conveyed, and the drive control unit drives and controls the upstream side film supply unit and/or the downstream side film supply unit to transport the carrier film.

In one embodiment of the invention, the carrier film transport unit is configured to have a take-up unit that winds up the carrier film after the optical film has been peeled off, and the drive control unit drives the control take-up unit to transport the carrier film. Moreover, the carrier film conveying unit may be configured to have one or more of the upstream side film supply unit, the downstream side film supply unit, and the winding unit.

1‧‧‧1st roll

11‧‧‧1st laminated optical film

12‧‧‧1st carrier film

13‧‧‧1st polarizing film (an example of an optical film)

13a‧‧‧film body

13b‧‧‧Adhesive layer

20‧‧‧1st cutting department

21‧‧‧Adsorption Department

30‧‧‧1st dancer roll

40‧‧‧1st peeling section

50a‧‧‧1st bonding roll

50b‧‧‧1st drive roller

60‧‧‧1st Volume

60a‧‧‧Winding roller

80‧‧‧Transporting roller

101‧‧‧1st carrier film transport unit

102‧‧‧1st liquid crystal cell transport unit

103‧‧‧1st fitting department

104‧‧‧Second liquid crystal cell transport unit

110‧‧‧First Drive Control Department

131‧‧‧1st polarizing film (an example of an optical film)

M1‧‧‧ motor

M2‧‧‧ motor

P‧‧‧Liquid Crystal Unit (a case of optical unit)

Q‧‧‧Fit position

T1‧‧‧ fitting start time

T2‧‧‧ take-up start time

T3‧‧‧ Midway time point (speed synchronization point)

T4‧‧‧ speed difference generation time

T5‧‧‧ fitting completion time

V1‧‧‧Winding speed (transport speed of carrier film, feed rate of polarizing film)

V2‧‧‧Finishing speed (transport speed of liquid crystal cell, pull-in speed of polarizing film)

Y‧‧‧Liquid LCD panel (an example of an optical display panel)

Fig. 1 is a schematic view showing an example of a continuous manufacturing system of an optical display panel.

Fig. 2A is a view for explaining the operation of the drive control unit.

Fig. 2B is a view for explaining the operation of the drive control unit.

Fig. 2C is a view for explaining the operation of the drive control unit.

Fig. 2D is a view for explaining the operation of the drive control unit.

Fig. 2E is a view for explaining the operation of the drive control unit.

Fig. 3 is a view showing the relationship between the bonding speed and the winding speed in the embodiment.

Fig. 4A is a view showing the speed condition of the first embodiment.

Fig. 4B is a view showing the speed condition of the second embodiment.

Fig. 4C is a view showing the speed condition of the third embodiment.

Fig. 4D is a view showing the speed condition of the fourth embodiment.

Fig. 4E is a view showing the speed condition of the fifth embodiment.

Fig. 5A is a view showing the speed condition of Comparative Example 1.

Fig. 5B is a view showing the speed condition of Comparative Example 2.

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 comprised by being wound into a roll shape. Examples of the roller include the following: (1) A laminated optical film having a carrier film and a belt-shaped optical film formed on the carrier film via an adhesive is wound into a roll shape. In this case, the continuous manufacturing system of the optical display panel has a cutting portion for retaining the optical film from the strip-shaped optical film, and the cutting portion retains the carrier film without cutting the carrier film, and cuts the strip-shaped optical film at specific intervals. And adhesive (half-cut laminated optical film).

Further, examples of the roller include (2) a laminated optical film having a carrier film and an optical film formed on the carrier film via an adhesive, which is wound into a roll shape (so-called cut) Roll of laminated optical film). In addition, 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 of these optical films.

For example, in the first roll 1 shown in FIG. 1, the first laminated optical film 11 having the first carrier film 12 and the first polarizing film (an example of the optical film) 13 laminated on the first carrier film 12 is wound into a roll. Shaped. The first polarizing film 13 includes a film main body 13a and an adhesive layer 13b.

The polarizing film is formed, for example, by a polarizing element (having a thickness of about 1.5 to 80 μm) and a single-sided or double-sided polarizing element protective film (having a thickness of usually about 1 to 500 μm) of the polarizing element via an adhesive or without an adhesive. . Examples of the other film constituting the first laminated optical film 11 include a retardation film such as a λ/4 plate or a λ/2 plate (having a thickness of usually 10 to 200 μm), a viewing angle compensation film, a brightness enhancement film, and a surface protection film. Wait. The thickness of the laminated optical film is, for example, in the range of 10 μm to 500 μm. The adhesive to be interposed between the polarizing film and the carrier film is not particularly limited, and examples thereof include an acrylic adhesive, a polyoxygen adhesive, and a urethane adhesive. The layer thickness of the adhesive is, for example, preferably in the range of 10 μm to 50 μm. The peeling force of the adhesive and the carrier film is, for example, 0.15 (sample of N/50 mm width), but is not limited thereto. The peeling force was measured in accordance with JIS Z0237.

As the carrier film, for example, a conventionally known film such as a plastic film (for example, a polyethylene terephthalate film or a polyolefin film) can be used. Further, if necessary, those which have been subjected to coating treatment by a suitable release agent such as polyoxymethylene or a long-chain alkyl group, fluorine-based or molybdenum sulfide, etc., may be suitable as before.

The optical display panel is formed by bonding at least an optical film to one surface or both surfaces of the optical unit via an adhesive, and may be incorporated into the driving circuit as needed. Examples of the optical unit include a liquid crystal cell and an organic EL (electroluminescence) unit. For the liquid crystal cell, for example, any type such as a Vertical Alignment (VA) type or an IPS (In-Plane Switching) type can be used. As the organic EL unit, for example, any type such as a top emission method, a bottom emission method, or a double-sided emission method 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 (the first substrate Pa and the second substrate Pb) disposed opposite to each other.

<Embodiment 1>

Hereinafter, the continuous manufacturing system of the optical display panel of the present embodiment will be specifically described with reference to Figs. 1 to 3, but the present invention is not limited to the embodiment. The liquid crystal cell is exemplified as an optical unit, and a polarizing film is exemplified 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. 1 is a schematic view of a continuous manufacturing system of an optical display panel, and FIG. 2 is a view for explaining an operation of a drive control unit. Fig. 3 is a graph showing the relationship between the bonding speed and the winding speed.

The continuous manufacturing system of the optical display panel of the present embodiment includes the first carrier film transport unit 101, the first peeling unit 40, the first liquid crystal cell transport unit 102, and the first bonding unit 103 (the first bonding roller 50a, the first 1 drive roller 50b), first drive control unit 110, second liquid crystal cell transfer unit 104, second carrier film transfer unit, second peeling unit, and second bonding unit (second bonding roller, second driving roller) The second drive control unit and the 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 (the back surface is reversed, if necessary rotated by 90°), and the liquid crystal cell is attached to the upper side of the liquid crystal cell. The light film, but the polarizing film may be attached from the lower side of the liquid crystal cell, and the liquid crystal cell may be turned over, and the polarizing film may be attached from the lower side of the liquid crystal cell, or the polarizing film may be attached from the upper side of the liquid crystal cell, and the liquid crystal is not allowed. The unit is turned over, and the polarizing film is attached to the lower side of the liquid crystal unit, and the polarizing film may be attached from the lower side of the liquid crystal unit, so that the liquid crystal unit is not turned over, and the polarizing film is attached from the upper side of the liquid crystal unit.

The first liquid crystal cell transport unit 102 supplies and transports the liquid crystal cell P to the first bonding unit 103. In the present embodiment, the first liquid crystal cell transport unit 102 is configured to include a transport roller unit 80, an adsorption plate, and the like. The liquid crystal cell P is transported to the downstream side of the production line by rotating the transport roller 80 or by transferring the adsorption plate. In the bonding process of the first polarizing film 131, the first liquid crystal cell transport unit 102 is controlled by the first drive control unit 110 described below, and the liquid crystal cell P is transported to the bonding position of the first bonding unit 103.

The first carrier film transport unit 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 conveying unit 101 includes a first cutting unit 20 for sequentially feeding the first laminated optical film 11 from the first roller 1 and cutting the strip-shaped first polarizing film at a predetermined interval. On the first carrier film 12, a first polarizing film 131 is formed. The polarizing film 131 is peeled off from the first carrier film by the first peeling portion 40 described later, and is supplied to the first bonding portion 103. Therefore, the first carrier film conveying unit 101 includes the first cutting unit 20 , the first dancer roller 30 , and the first winding unit 60 . In addition, the first carrier film conveying unit 101 may include a feeding roller that conveys the first carrier film 12 (the first laminated optical film 11) to the upstream side or the downstream side of the first peeling unit 40 (not shown). Show).

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

The first dancer roller 30 (corresponding to the tension adjusting portion) has a function of maintaining the tension of the first carrier film 12 in each of the conveyance process and the bonding process. By the first dancer roller 30, At the initial stage of the bonding, the tension is applied to the first polarizing film 131 more reliably. The first carrier film conveying unit 101 conveys the first carrier film 12 via the first dancer roller 30 .

When the first polarizing film 131 is bonded to the liquid crystal cell P, the first peeling portion 40 is folded inside at the front end of the first carrier film 12, and is first folded from the first carrier film 12. The polarizing film 131 (including an adhesive) is peeled off. In the present embodiment, the first peeling portion 40 is a sharp blade portion at its tip end, but the present invention is not limited thereto.

The first winding unit 60 has a take-up roll 60a, and the first carrier film 12 from which the first polarizing film 131 has been peeled off is taken up to the take-up roll 60a. In the present embodiment, the winding speed V1(t) of the first carrier film 12 of the first winding unit 60 corresponds to the first polarizing film 131 during the bonding process (process) of the first polarizing film 131. The conveying speed of the peeled carrier film. The first winding unit 60 is driven and controlled (drive start, stop, rotation speed, etc.) by the first drive control unit 110 described below. The first drive control unit 110 controls the motor M1 that rotationally drives the take-up roller 60a of the first winding unit 60, for example.

The first bonding unit 103 bonds the first polarizing film 131 peeled off from the first carrier film 12 to the liquid crystal cell P via the adhesive while the liquid crystal cell P is being transferred, thereby forming an optical display panel. In the present embodiment, the first bonding unit 103 includes a first bonding roller 50a and a first driving roller (support roller) 50b. In the bonding period (process) of the first polarizing film 131, the rotational speed of the first driving roller 50b corresponds to the bonding speed V2(t), and the first driving roller 50b is driven and controlled by the following driving control unit 110. (drive start, stop, rotation speed, etc.). Further, the first bonding roller 50a is a driven mechanism by the driving of the first driving roller 50b. However, the first bonding roller 50a is not limited thereto, and may be a mechanism that drives the opposite of the driving, or both of them may be driving mechanisms. The first drive control unit 110 controls the motor M2 that rotatively drives, for example, the first drive roller 50b.

The first polarizing film 131 is transported to the bonding position Q by the winding of the first carrier film 12 of the first winding unit 60 (or by the above-described feeding roller). On the other hand, the liquid crystal cell P is transported 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 while being transported.

At this time, the first polarizing film 131 has a function of feeding the first winding unit 60 (or the feed roller) and sandwiching the first driving roller 50b and the first bonding roller 50a. Hold and pull in. In other words, when the pulling action (adhesion speed V2) is larger than the feeding action (winding speed V1 or conveying speed by the feed roller), there is a liquid crystal display panel after the tension is increased. On the other hand, in the case where the warpage is caused, the first polarizing film 131 is bent and shaken, and the bubble is bad at the initial stage of bonding. Therefore, in the present embodiment, the above problem is solved by controlling the first winding unit 60 (winding speed V1) and the first bonding unit 50 (bonding speed V2) as follows.

The first drive control unit 110 controls the first winding unit 60 and the first driving roller 50b, respectively, and drives the winding speed V1 of the first carrier film 12 during the bonding processing of the first polarizing film 131 ( The transport speed of the carrier film, the feed speed of the polarizing film, and the bonding speed V2 (the transport speed of the liquid crystal cell and the pull-in speed of the polarizing film) of bonding the first polarizing film 131 to the liquid crystal cell P. Fig. 3 shows the relationship between the winding speed V1 and the bonding speed V2 during the entire bonding process.

In FIG. 3, the first polarizer film 131 is peeled off from the first carrier film 12 at the front end of the peeling process, and the first polarizing film 131 is transported to the bonding position Q (see FIG. 2A, V1>0). At this time, the first polarizing film 131 is transported to the bonding position Q by the winding roller 60a or by feeding the upstream side or the downstream feeding roller by the first peeling unit 40. The first polarizing film 131 reaches the bonding position Q, and the feeding is temporarily stopped (the winding roller 60a is stopped (see FIG. 2B, V1=0).

Then, the bonding process is started. At the initial stage of bonding, the winding roller 60a, the first driving roller 50b, and the first bonding roller 50a are rotated at the bonding start time point T1 (and the winding start time point T2). The bonding speed V2 of the first polarizing film 131 on the liquid crystal cell P is set to be larger than the half point T3 in the period from the bonding start time point T1 to the bonding completion time point T5. 1 The take-up speed V1 of the carrier film 12 (V2 > V1 > 0). In this After the midway time point (the time point at which the speed is synchronized) T3, the bonding speed V2 is made to coincide with the winding speed V1 (V2 = V1). The first polarizing film 131 and the liquid crystal cell P are sandwiched between the first driving roller 50b and the first bonding roller 50b, and the first polarizing film 131 is bonded to the liquid crystal cell P surface (see the figure). 2C).

Then, in the middle of the bonding, the winding speed V1 is also matched with the bonding speed V2 (V1 = V2). Then, at the end of the bonding, the first polarizing film 131 bonded at the current time point is completely peeled off from the first carrier film 12, and thereafter, in order to stop the winding roller 60a, the speed difference occurrence time point T4 is caused. The take-up speed V1 is decelerated, and the rotation of the take-up roller 60a is stopped before the completion of the bonding (V1 = 0, see Fig. 2D). Thereafter, the rotation of the first driving roller 50b is decelerated (the bonding speed is decelerated), and the bonding of the first polarizing film 131 to the liquid crystal cell P is completed (the bonding completion time point T5, see FIG. 2E). After the completion of the bonding, the rotation of the first driving roller 50b is stopped (V2 = 0). Thereafter, move to the next fit.

In the above, the relationship between the bonding speed V2 and the winding speed V1 is from the bonding start time point T1 to the intermediate time point T3. When the speed relationship is concerned, the first polarizing film 131 is on the liquid crystal cell P. The bonding period (area) is 1/2 or less of the bonding length.

Moreover, it is preferable that the first drive control unit 110 performs drive control so as to have a speed relationship of V2 > V1 at least until the bonding is completed.

In addition, the first drive control unit 110 drives and controls the first drive roller 50b so that the bonding speed V2 is greater than zero from the bonding start time point T1 to the bonding completion time point T5, and before the bonding is completed, The winding roller 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 drives and controls the winding of the first drive roller 50b and the first winding unit 60 so that V2(t)=0 and V1(t)=0 before the next bonding start time point. Roller 60a.

In addition, the first drive control unit 110 may be configured to control a feed roller (not shown) provided on the downstream side of the first peeling unit 40 and upstream of the first winding unit 60 instead of the first peeling unit 40. Controlling the first winding unit 60 (or in addition to controlling the first winding unit 60), thereby controlling the 1 The transport speed of the carrier film 12.

In addition, the first drive control unit 110 may be configured to control the feed roller (not shown) provided on the upstream side of the first peeling unit 40 in addition to the first take-up unit 60. This controls the transport speed of the first carrier film 12.

The first drive control unit 110 may be configured by a dedicated device or a dedicated circuit, or may be configured by a computer and a cooperative operation of a program for executing the above-described control programs, or may be configured by firmware.

Further, in the above-described embodiment, the relationship between the bonding speed V2 and the winding speed V1 is set from the bonding start time point T1 to the intermediate time point T3, and the bonding speed V2 is set after the intermediate time point T3. The period during which the take-up speed V1 is the same. In another embodiment, the relationship may be such that the bonding speed V2 > the winding speed V1 is from the bonding start time point T1 to the intermediate time point T3, and the winding conveyance speed V1 is set after the intermediate time point T3. A period greater than the bonding speed V2.

(second liquid crystal cell transfer unit)

The second liquid crystal cell transport unit 104 transports and supplies the liquid crystal cell P to which the first polarizing film 131 is bonded by the first bonding unit 103 to the second bonding unit. The second liquid crystal cell transport unit 104 includes a rotating mechanism (not shown) that horizontally rotates the liquid crystal cell P to which the first polarizing film 131 is bonded, and an inverting mechanism that bonds the first polarized light The liquid crystal cell P of the film 131 is turned upside down. In the first bonding unit 103, the first polarizing film 131 is bonded to the first surface of the liquid crystal cell P in the first bonding direction, and the first bonding portion is bonded to the first bonding portion. The second polarizing film is bonded to the second surface of the liquid crystal cell P in the second bonding direction in the direction orthogonal to the direction.

As described above, various mechanisms for bonding the polarizing film to the other surface of the liquid crystal cell P can use the various mechanisms, devices, and the like described above. The second carrier film conveying unit may be configured by the same device as the first carrier film conveying unit, and the second bonding unit may be configured by the same device as the first bonding unit. For example, the second dancer roller may be configured by the same device as the first dancer roller 30, and the second winding portion may be configured by the same device as the first winding unit 60, and the second bonding roller. The second drive roller system can be configured by the same mechanism as the first bonding roller 50a and the first driving roller 50b. Further, the second drive control unit is configured to have the same function as that of the first drive control unit 110.

The optical display panel transport unit (not shown) is configured by a transport roller, an adsorption plate, or the like, and transports the liquid crystal display panel Y produced by the second bonding unit downstream. Further, a detecting device for detecting the liquid crystal display panel Y may be provided on the downstream side of the transport. The detection purpose and detection method of the detection device are not particularly limited.

(continuous manufacturing method)

The continuous manufacturing method of the optical display panel of the present embodiment includes a carrier film transport step of transporting the first carrier film 12 in which the first polarizing film 131 including the adhesive is laminated via the adhesive, and a peeling step. The first carrier film 12 conveyed by the carrier film transporting step is placed inside and folded, and the first polarizing film 131 is peeled off from the first carrier film 12; and the bonding step is performed The first polarizing film is set up from the time when the first polarizing film 131 is bonded to the liquid crystal cell P from the bonding start time point to the time when the bonding completion time is completed. The bonding speed of the liquid crystal cell P is higher than the transport speed of the first carrier film 12, and after the intermediate time point, the period in which the bonding speed is set to match the transport speed or the transport speed is set to be larger than the sticker When the liquid crystal cell P is transported, the first polarizing film 131 peeled off from the first carrier film 12 by the peeling step is bonded to the liquid crystal cell P while being set. The liquid crystal cell P, so as to form an optical display panel.

In the bonding step, the period (region) set so that the bonding speed is larger than the transport speed of the first carrier film 12 is 1/2 of the bonding length of the polarizing film 131 on the liquid crystal cell P. the following. Further, in the bonding step, the bonding speed is greater than zero from the bonding start time point to the bonding completion time point, and The transport speed of the carrier film 12 before the completion of the bonding is zero.

Further, when the polarizing film 131 is also bonded to the other substrate of the liquid crystal cell P, there is a step of swirling the liquid crystal cell P to be rotated and turned upside down. In the swirling step, the liquid crystal cell P to which the first polarizing film 131 is bonded is horizontally rotated by 90° and turned upside down. Further, as the swirling step, the liquid crystal cell P may be inverted such that the positional relationship between the long side and the short side of the liquid crystal cell P may be reversed so as not to be parallel to one of the long side and the short side. Further, the second bonding step of bonding the second polarizing film is the same as the first bonding step. In other words, in the first bonding step, the first optical film is bonded to the first surface of the optical unit in the first bonding direction, and in the second bonding step, in the direction orthogonal to the first bonding direction. That is, the second optical film is bonded to the second surface of the optical unit in the second bonding direction.

<Another embodiment>

In the above embodiment, the laminated optical film which is successively fed out from the rolls is cut at a predetermined interval (half cut), but the present invention is not limited to this configuration. For example, it is also possible to perform defect detection on the laminated optical film which is successively fed out from the roller, and perform cutting (so-called skip cutting) so as to avoid the defect based on the detection result. Further, it is also possible to read the defect information previously attached to the laminated optical film, and perform cutting based on the defect information so as to avoid the defect. The defect information can also be marked by the way the defect location is known.

Further, in the above embodiment, the bonding process is started once the first polarizing film has reached the bonding position, but such a process may be omitted.

Further, the first polarizing film of the first roller may be formed on the first carrier film by cutting in advance. That is, as the first roll, a roll of a so-called laminated optical film having a cut mark can be used. In this case, since the first cutting mechanism and the second cutting mechanism are not required, the process time can be shortened. Similarly to the first roll, the second roll may be a roll of a laminated optical film having a cut.

Further, in the above embodiment, the optical film is bonded to both surfaces of the optical unit, but the optical film may be bonded only to one surface of the optical unit.

<Example>

In the continuous manufacturing system of FIG. 1, the substrate on one side of the rectangular liquid crystal cell in which the liquid crystal layer is sealed between the oppositely disposed alkali-free glass substrates (manufactured by Corning Incorporated) is long on the short side thereof. The polarizing film (VEG1724DU manufactured by Nitto Denko Corporation) was attached to the side direction, and then bonded to the other side from the long side in the short side direction. In the examples and the comparative examples, the bonding speed V2 and the winding speed V1 (the conveying speed of the carrier film) were set and bonded together as follows.

In the first embodiment, when the bonding is started, the winding roller and the first driving roller are simultaneously rotated to start bonding. The winding speed V1 <the bonding speed V2 is set from the bonding start time point T1 to the halfway time point T3, and V1=V2 is obtained from the initial stage of the bonding after the intermediate time point T3 to the end of the bonding. The speed condition of Example 1 is shown in Fig. 4A. In addition, the bonding time differs depending on the bonding on one side (the first time) and the bonding on the other side (the second time), but this aspect has been appropriately adjusted.

The second embodiment is the same as the first embodiment except that it is in the initial region and has a speed condition of V1 < V2. 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 also set in the initial region and the medium-term rise. The speed conditions of Example 3 are shown in Fig. 4C.

The fourth embodiment is the same as the first embodiment except that it is a speed condition of V1 < V2 in the initial region, the medium-term rising period, and the medium-term region. The speed condition of Example 4 is shown in Fig. 4D.

In the fifth embodiment, V1 < V2 is set in the middle region and the middle portion is raised, and V1 > V2 is set in the fixed period from the time point T3 in the middle region, and thereafter V1 is set to V2. The same as in the first embodiment. The speed conditions of Example 5 are shown in Fig. 4E.

In Comparative Example 1, V1 = V2 was set from the start of the bonding to the end of the 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 the bonding to the end of the bonding. The speed condition of Comparative Example 2 is shown in Fig. 5B.

The presence or absence of bubbles in the front portion (the portion to which the initial bonding was applied) between the polarizing film and the liquid crystal cell after bonding and the warpage of the liquid crystal display panel were evaluated by visual inspection.

In the first to fifth embodiments, there was no bubble failure and warpage failure. However, in Comparative Example 1, since V1 = V2 was obtained throughout the entire period, bubble defects were found especially in the front portion of the optical film, and Comparative Example 2 was found. Since V1 < V2 was made throughout the entire period, warpage was found on the liquid crystal display panel.

1‧‧‧1st roll

11‧‧‧1st laminated optical film

12‧‧‧1st carrier film

13‧‧‧1st polarizing film (an example of an optical film)

13a‧‧‧film body

13b‧‧‧Adhesive layer

20‧‧‧1st cutting department

21‧‧‧Adsorption Department

30‧‧‧1st dancer roll

40‧‧‧1st peeling section

50a‧‧‧1st bonding roll

50b‧‧‧1st drive roller

60‧‧‧1st Volume

80‧‧‧Transporting roller

101‧‧‧1st carrier film transport unit

102‧‧‧1st liquid crystal cell transport unit

103‧‧‧1st fitting department

104‧‧‧Second liquid crystal cell transport unit

110‧‧‧First Drive Control Department

131‧‧‧1st polarizing film (an example of an optical film)

P‧‧‧Liquid Crystal Unit (a case of optical unit)

Y‧‧‧Liquid LCD panel (an example of an optical display panel)

Claims (4)

A continuous manufacturing method of an optical display panel, comprising the steps of: carrying a film transporting step of transporting a carrier film formed by laminating an optical film containing an adhesive through the adhesive; and a peeling step, which is carried out by the carrying The carrier film conveyed by the film transfer step is folded inside, and the optical film is peeled off from the carrier film; and a bonding step is performed at the bonding start time of bonding the optical film to the optical unit as described above. The point is set to a halfway time in the period from the completion of the bonding completion time point, and the bonding speed of the optical film to the optical unit is set to be larger than the transport speed of the optical film through which the optical film is peeled off, and After the intermediate time point, the optical unit is transported via the adhesive while the optical unit is transported while the bonding speed is set to coincide with the transport speed or when the transport speed is greater than the bonding speed. The optical film peeled off from the carrier film in the peeling step is bonded to the optical unit to form an optical display panel. The continuous manufacturing method of the optical display panel of claim 1, wherein the bonding step includes a first bonding step of bonding the first optical film to the first surface of the optical unit in the first bonding direction; And a second bonding step of bonding the second optical film to the second surface of the optical unit in a second bonding direction which is a direction orthogonal to the first bonding direction. A continuous manufacturing system for an optical display panel, comprising: a carrier film transporting portion that transports a carrier film formed by laminating an optical film containing an adhesive through the adhesive; and a peeling portion that is transported by the carrier film The carrier film conveyed on the inside is folded inside, and the optical film is peeled off from the carrier film; a bonding unit that bonds the optical film that has been peeled off from the carrier film by the peeling portion to the optical unit via the adhesive, thereby forming an optical display panel; and a drive control unit; And driving and controlling the bonding portion as follows, and driving and controlling the carrier film conveying portion: a bonding completion time from the start of bonding of the optical film to the optical unit from the beginning to the completion of bonding The bonding speed of the optical film to the optical unit is higher than the transport speed of the optical film peeled off from the film at the midway point in the period until the dot is set, and the bonding speed is set after the intermediate time point The period in which the conveyance speeds match is set or the period in which the conveyance speed is larger than the attachment speed. The continuous manufacturing system of the optical display panel of claim 3, wherein the bonding portion includes: a first bonding portion that bonds the first optical film to the first surface of the optical unit in the first bonding direction; And a second bonding portion that bonds the second optical film to the second surface of the optical unit in a second bonding direction that is orthogonal to the first bonding direction.