CN111373466A

CN111373466A - Method of manufacturing optical display device

Info

Publication number: CN111373466A
Application number: CN201980005783.3A
Authority: CN
Inventors: 藤原誓大; 大泽曜彰; 中村宜弘; 堤清贵; 秋山孝二
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2018-06-29
Filing date: 2019-06-05
Publication date: 2020-07-03
Also published as: TWI801606B; KR20210023790A; WO2020003931A1; JP6605662B1; JP2020003687A; TW202006432A

Abstract

The invention provides a method for manufacturing an optical display device by adhering a sheet-shaped optical functional film to a panel member without generating at least stripe-shaped deformation on an adhesive layer. The method comprises stopping the tip of an optical functional film sheet before peeling off on an adhesive layer of the optical functional film sheet peeled off from a carrier film at a stop position not protruding from the top of a peeling body having a top, feeding the tip of the optical functional film sheet from the stop position of the peeling body to a panel bonding position while peeling off the optical functional film sheet from the carrier film on the top of the peeling body by restarting winding the carrier film, and bonding the optical functional film sheet and the panel member by sandwiching them between a pair of bonding rollers which close and rotate a pair of bonding rollers in an open state without stopping while overlapping the panel member previously fed to the panel bonding position, thereby producing an optical display device without causing stripe-like distortion in the adhesive layer.

Description

Method of manufacturing optical display device

Technical Field

The present invention relates to a method for manufacturing an optical display device by an RTP method. More specifically, the present invention relates to a method for manufacturing an optical display device, in which, on an adhesive layer of a sheet-like optical functional film peeled from a carrier film, a tip portion of the sheet-like optical functional film before peeling is stopped at a stop position where a peeling body having a tip portion does not protrude from the tip portion, the sheet-like optical functional film is peeled from the carrier film by the tip portion of the peeling body by winding the carrier film again, the tip portion of the sheet-like optical functional film is conveyed from the stop position on the peeling body to a panel bonding position, and the sheet-like optical functional film is overlapped with a panel member conveyed to the panel bonding position without stopping, and is sandwiched and bonded by a pair of bonding rollers that are operated at least to open and close, whereby at least stripe-like deformation is not generated in the adhesive layer.

Background

In recent years, a roll-to-Roll (RTP) manufacturing apparatus and method have been used at the manufacturing site of an optical display device (for example, patent document 1). In the RTP method, an optical display device is generally manufactured as follows. First, a belt-shaped optical film laminate having a predetermined width is pulled out from a roll. The tape-shaped optical film laminate is composed of a tape-shaped carrier film, an adhesive layer formed on one surface of the carrier film, and an optical functional film (a protective film, a polarizer, a protective film, an adhesive layer, and a surface protective film) supported on the carrier film via the adhesive layer. By continuously forming the dicing lines in the width direction in the extracted tape-shaped optical film laminate and forming the sheet-shaped optical functional films between the adjacent dicing lines, the adjacent sheet-shaped optical functional films can be separated from each other by the stretching action.

In general, a normal material free from defects is peeled from a carrier film together with an adhesive layer by a peeling device disposed in the vicinity of a panel bonding position, and the sheet-like optical functional film continuously supported on the carrier film is sent to the panel bonding position. The sheet-like optical functional film that has reached the panel bonding position is laminated by being sandwiched between the corresponding bonding surfaces of the panel members that have been separately conveyed to the panel bonding position, by a bonding device such as a pair of upper and lower bonding rollers that are opened and closed.

In the peeling device, the carrier film side of the optical film laminate is wound on the top of a substantially wedge-shaped peeling device having a top portion opposed to the panel bonding position. The sheet-like optical functional film is peeled from the carrier film together with the adhesive layer by folding back and conveying the carrier film wound around the peeling device in a direction substantially opposite to the conveying direction of the sheet-like optical functional film toward the panel bonding position. In the present specification, a position at which the sheet-like optical functional film is peeled from the carrier film, that is, a position on the device is referred to as a peeling position, and the peeling position exists near the top of the peeling device.

In such an RTP-type manufacturing system, the sheet-like optical functional film on the carrier film may be fed to a bonding position where the sheet-like optical functional film is bonded to the panel member in a state where the posture of the sheet-like optical functional film is deviated from an ideal posture. In this case, it is necessary to bond the panel member and the sheet-like optical functional film after correcting the posture of the panel member in accordance with the state of misalignment of the sheet-like optical functional film (also referred to as "posture adjustment").

In the RTP manufacturing system, the adhesive layer may be deformed in a stripe shape. In the case of a conventional thick optical functional film, even if the adhesive layer is deformed in a stripe shape, it is difficult to consider the deformation to be a defect level on an image of an optical display device. However, due to the recent demand for high precision and high quality of optical display devices, the stripe-like deformation of the adhesive layer, which has not been recognized as a defect in the past, may also become a defect. Further, if the optical functional film is made thinner, the ratio of the thickness of the adhesive layer to the thickness of the optical functional film is increased as compared with the case of the conventional thick optical functional film. With the spread of such thin optical functional films, the stripe-like distortion formed in the adhesive layer may not be ignored as a defect in an image of an optical display device.

Patent document 1: japanese patent No. 6171041

Patent document 2: japanese patent No. 5452761

Patent document 3: japanese unexamined patent application publication No. 2004-361741

Patent document 4: japanese unexamined patent publication No. 2012-113060

Patent document 5: japanese patent No. 5452760

Patent document 6: japanese patent No. 5458212

Patent document 7: japanese patent No. 5458211

Disclosure of Invention

Technical problem to be solved by the invention

The present invention aims to provide a method for bonding a sheet-shaped optical functional film to a panel member so that the adhesive layer does not deform in a stripe shape when the sheet-shaped optical functional film peeled from a carrier film of a strip-shaped optical film laminate together with the adhesive layer is bonded to the panel member via the adhesive layer to manufacture an optical display device.

Patent document 1 describes that the stripe-like distortion generated on the adhesive layer of the sheet-like optical functional film in parallel with the feeding of the sheet-like optical functional film is eliminated. Specifically, a method is described in which while adjusting the conveyance speed of a bonding roller bonded to a panel member, the pressing force of the bonding roller is used to eliminate the stripe-like deformation that occurs in the adhesive layer when the sheet-like optical functional film peeled from the carrier film together with the adhesive layer is stopped in a state of running over from the top of the peeling apparatus.

Patent document 2 describes a carrier film transfer apparatus that, when a step of bonding a preceding optical film sheet, from which a carrier film is peeled together with an adhesive layer, to a preceding panel member is completed, accurately returns the leading end portion of an optical film sheet with an adhesive layer on a subsequent carrier film, which has once protruded from the top of a peeling body, to a predetermined position of the peeling body and stands by, and forward and reverse feed rollers are disposed in front of and behind the peeling body.

Patent document 3 describes a bonding apparatus as follows: the optical film having the adhesive layer is transferred to the substrate which is transferred to the pair of open bonding units in advance, and the optical film is bonded to the substrate through the adhesive layer by the bonding units which perform a closing operation when the optical film is in a head-up state. Patent document 4 describes that when a sheet peeled from a carrier film together with an adhesive layer is bonded to a liquid crystal panel, the bonding speed of a bonding roller is set to be higher than the transport speed of the carrier film to eliminate the deflection generated in the sheet.

Patent document 5 describes that since the top of a peeling body having a top of a device for sticking an optical film sheet to a panel member is closer to the sticking position of the device to improve the sticking accuracy, the rear end of the optical film sheet is read at a predetermined detection position so that the front end of the next optical film sheet is positioned at a predetermined sticking position with high accuracy.

Disclosure of Invention

However, the present inventors have conducted intensive studies and have achieved a method in which: an optical display device is manufactured by feeding a sheet-like optical functional film to a bonding position without causing stripe-like distortion on an adhesive layer of the sheet-like optical functional film, and bonding the sheet-like optical functional film to a panel member standing by at the bonding position via the adhesive layer without stripe-like distortion.

The embodiments of the present invention are as follows:

as shown in fig. 1, an optical display device is manufactured by a method in which, from a carrier film 2 of a belt-like optical film laminate 1 including the carrier film 2, an adhesive layer 4 formed on one surface of the carrier film 2, and a plurality of sheet-like optical functional films 3 continuously supported on the carrier film 2 via the adhesive layer 4, the sheet-like optical functional films 3 are peeled off together with the adhesive layer 4, and the tip end portions 32 of the sheet-like optical functional films 3 are fed to a panel bonding position 100 where a pair of

bonding rollers

51, 51 are opened, and are superposed on a panel member 5 fed to the panel bonding position 100 in advance without being stopped, and the sheet-like optical functional films 3 are sandwiched and bonded together with the panel member 5 by a pair of

bonding rollers

51, 52 which are closed by closing operation.

In the present method, as shown in fig. 2A (a1) and (a2), fig. 8A (a1) and (a2), fig. 10A (a1) and (a2), there are: step a of stopping the leading end portion 32 of the sheet-like optical functional film 3 supported on the carrier film 2 at the stop position 200 on the peeling body 60 without protruding from the top portion 61 of the peeling body 60 having the top portion 61 arranged at the position facing the panel bonding position 100, and step B of conveying the panel member 5 to the panel bonding position 100 where the pair of

bonding rollers

51 and 52 are opened, and stopping and waiting, as shown in fig. 2A (c1), (c2), fig. 8A (c1), (c2), fig. 10A (c1), and c2, are also described.

The method also comprises the following steps: a step C of conveying the carrier film 2 by folding back the top portion 61 of the peeling body 60 and conveying the carrier film as shown in fig. 2B (d1), (d2), fig. 8B (d1), (d2), fig. 10B (d1), and fig. 2, thereby peeling the sheet-like optical functional film 3 together with the adhesive layer 4 and conveying the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 on the peeling body 60 to the panel bonding position 100 where the pair of bonding rollers are opened, so as to be superposed on the standby panel member 5 without stopping; step D of switching the pair of

open pasting rollers

51 and 52 and performing a closing operation before the leading end portion 32 of the sheet-like optical functional film 3 is overlapped with the panel member 5 waiting at the panel pasting position 100 by detecting that the leading end portion 32 of the sheet-like optical functional film 3 sent without being stopped reaches the predetermined position 300 between the stop position 200 on the peeling body 60 and the panel pasting position 100 as shown in fig. 2B (e1) and (e2), fig. 8B (e1) and (e2), and fig. 10B (e1) and (e2) in the same manner; in the step E, as shown in fig. 2B (f1) and (f2), fig. 8B (f1) and (f2), and fig. 10B (f1) and (f2), the pair of

application rollers

51 and 52 performing the closing operation sandwich and apply the sheet-like optical functional film 3 together with the panel member 5 while the front end portion 32 of the sheet-like optical functional film 3 is superposed on the panel member 5.

The method also comprises the following steps: a step F of stopping the process when the next leading end portion 32 of the sheet-like optical functional film 3 supported by the support film 2 reaches the stop position 200 on the peeling body 60 as shown in fig. 2C (h1) and (h2), fig. 8C (h1) and (h2), and fig. 10C (h1) and (h2), and causing the stopped next leading end portion 32 of the sheet-like optical functional film 3 and the rear end portion 31C of the sheet-like optical functional film 3 fed to the panel member 5 to be bonded to each other by the pair of

bonding rollers

51 and 52 rotated by the closing operation and to be disconnected from each other; in the step G, as shown in fig. 2C (i1) and (i2), fig. 8C (i1) and (i2), and fig. 10C (i1) and (i2), after the pair of

application rollers

51 and 52 rotated by the closing operation have completed the adhesion of the sheet-like optical functional film 3 and the panel member 5, the pair of

application rollers

51 and 52 operated by the closing operation are opened.

As one embodiment of the present invention, as shown in fig. 2B (d1) and (e1), fig. 8B (d1) and (e1), and fig. 10B (d1) and (e1), the pair of

pasting rollers

51 and 52 that sandwich and laminate the sheet-like optical functional film 3 and the panel member 5 are rotated at the same speed as the pasting start speed v2 of the sheet-like optical functional film 3 when the front end portion 32 of the sheet-like optical functional film 3 is overlapped with the panel member 5 before sandwiching the sheet-like optical functional film 3 and the panel member 5.

As one embodiment of the present invention, as shown in fig. 2A (B1) and 2B (f1), fig. 8A (B1) and 8B (f1), and fig. 10A (B1) and 10B (f1), the present invention further includes a step H of detecting that the front end portion 32 of the sheet-like optical functional film 3 has reached the predetermined position 300 between the stop position 200 on the peeling body 60 and the panel bonding position 100 by monitoring the distance δ of the feed length of the rear end portion 31 of the sheet-like optical functional film 3.

As one embodiment of the present invention, as shown in fig. 2B (f1), 8B (f1), and 10B (f1), the method preferably includes the steps of: the front end portion 32 of the sheet-like optical functional film 3 is overlapped on the panel member 5, and the application start speed v2 of the sheet-like optical functional film 3 which is conveyed without stopping while being sandwiched by the pair of

application rollers

51, 52 which are closed is less than 10 mm/sec.

As another embodiment of the present invention, as shown in fig. 2C (g1) and (h1), fig. 8C (g1) and (h1), and fig. 10C (g1) and (h1), the present invention includes a step I of, when the bonding operation between the sheet-like optical functional film 3 and the panel member 5 reaches a predetermined length λ, switching the bonding speed of the pair of

bonding rollers

51 and 52 which are closed from the bonding start speed v2 to the bonding operation speed v3 which is higher than the bonding start speed v2, and further bonding the sheet-like optical functional film 3 and the panel member 5, while sandwiching the pair of

bonding rollers

51 and 52 which are closed.

As another embodiment of the present invention, as shown in [ s13] of fig. 3, [ s13] of fig. 9, and [ s13] of fig. 11, the method further includes a step I of feeding the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 on the peeling member 60 to the panel bonding position 100 at a feeding speed v1 adjusted to be higher than the bonding start speed v2, switching from the feeding speed v1 to the bonding start speed v2 before reaching the predetermined position 300 between the stop position 200 on the peeling member 60 and the panel bonding position 100, and further overlapping the leading end portion 32 on the panel member 5 on standby without stopping.

As still another aspect of the embodiment of the present invention, as shown in fig. 2C (g1), 8C (g1), 10C (g1), and [ s10], [ s12] and [ s17] of fig. 3, [ s10], [ s12] and [ s17] of fig. 9, and [ s10], [ s12] and [ s17] of fig. 11, it is preferable that the bonding start speed v2 switching the feeding speed v1 of the leading end portion 32 from the stop position 200 of the peeling body 60 to the panel bonding position 100 and the feeding speed v1 before reaching the predetermined position 300 between the stop position 200 on the peeling body 60 and the panel bonding position 100, and the bonding operation speed v3 switching the bonding speed of the pair of

bonding rollers

51 and 52 from the bonding start speed v 73727 when the bonding of the sheet-like optical functional film 3 and the panel member 5 reaches the predetermined length λ > and that the bonding operation speed v3 satisfies the relationship of v 3984, v 4642 > v 1.

Drawings

Fig. 1 is an enlarged schematic view of an apparatus for manufacturing an optical display device by bonding a sheet-like optical functional film and a panel member via an adhesive layer at a panel bonding position using a pair of bonding rollers. In fig. 1, the stop positions of the two-point moving type camera detection device for reading the rear end portion of the sheet-like optical functional film and the peeling body having the cross-sectional cone with the apex portion are located at the front end portion of the sheet-like optical functional film, and the two-point moving type camera detection device for reading the rear end portion of the sheet-like optical functional film to detect the position of the front end portion is represented by a movement distance δ in a reciprocating manner at the current position and the virtual position;

fig. 2A to 2C are schematic views showing steps (a1), (a2) to (i1) and (i2) of overlapping and sticking the sheet-like optical functional film onto the panel member waiting at the panel sticking position by moving the front end portion of the sheet-like optical functional film to the panel sticking position while peeling the sheet-like optical functional film from the carrier film shown in fig. 1. Fig. 2A to 2C show a two-point movement type camera detection device for reading a rear end portion of a sheet-like optical functional film for measuring a movement amount of a front end portion of the sheet-like optical functional film. FIG. 2A shows the steps of (a1) and (a2) to (c1) and (c 2);

FIG. 2B shows the steps (d1), (d2) and (f1) and (f2) after FIG. 2A;

FIG. 2C shows the steps (g1), (g2), (i1) and (i2) after FIG. 2B;

fig. 3 is a control flowchart showing detailed steps [ s1] to [ s20] of a manufacturing process of the apparatus for manufacturing an optical display device in which a pair of bonding rollers configured to be opened and closed in the vertical direction with respect to the feeding direction while performing a bonding operation shown in fig. 2A to 2C are operated;

FIG. 4 is a diagram showing examples and comparative examples in which a sheet-like optically functional film 3 having a thickness of 110 μm and an adhesive layer 4 having a thickness of 25 μm (total thickness: 135 μm) are bonded to a panel member 5, and the diagrams are composed of examples 1 to 6 and comparative examples 1 to 3. The evaluation items in the figure show the stop of the head, the film feeding speed v1, the sticking start speed v2, the sticking running speed v3, the offset of the adhesive marks, the sticking, the productivity, and the like;

fig. 5 is a schematic view showing a mode in which the tip end portion of the sheet-like optical functional film in a constant-cross-over state is detected from the top of the peeling body in comparative example 1 of fig. 4, the sheet-like optical functional film is fed from the detection position of the tip end portion to the panel bonding position, and the sheet-like optical functional film is bonded by being correctly aligned with the panel member;

fig. 6 is a schematic view showing a mode of bonding the front end portion of the next sheet-like optical functional film after the previous bonding step is completed, by fine-adjusting the front-back feeding of the sheet-like optical functional film and more accurately aligning the sheet-like optical functional film with the panel member, in the panel bonding position detection in comparative example 2 of fig. 4;

fig. 7 is a schematic view showing a mode of bonding the optical functional film sheet by winding the tip portion of the optical functional film sheet after the previous bonding step is completed around a feeding position provided on the upstream side of the top portion of the separator, detecting the tip portion, feeding the optical functional film sheet from the feeding position to the panel bonding position, and accurately aligning the optical functional film sheet with the panel member in comparative example 3 of fig. 4;

fig. 8A to 8C are schematic views showing steps (a1), (a2) to (i1) and (i2) of peeling the sheet-like optical functional film from the carrier film, advancing the front end of the sheet-like optical functional film to the panel bonding position, and laminating the sheet-like optical functional film by sandwiching the sheet-like optical functional film between the panel members waiting at the panel bonding position, as shown in fig. 1, similarly to fig. 2A to 2C. In fig. 8A to 8C, instead of the 2-dot movement type camera inspection device that reads the rear end portion of the sheet-like optical functional film arranged in fig. 2A to 2C, a wide-field single-body fixed type camera inspection device capable of alternately detecting two points to be read is provided. FIG. 8A shows the steps of (a1) and (a2) to (c1) and (c 2);

FIG. 8B shows the steps of (d1), (d2) to (f1) and (f2) following FIG. 8A;

FIG. 8C shows the steps of (g1), (g2), (i1) and (i2) following FIG. 8B;

fig. 9 is a control flowchart showing detailed steps [ s1] to [ s20] of a manufacturing process of the apparatus for manufacturing an optical display apparatus shown in fig. 8A to 8C, which operates a pair of bonding rollers configured to open and close in the up-down direction with respect to the feeding direction while performing a bonding operation;

fig. 10A to 10C are schematic diagrams showing steps (a1), (a2) to (i1) and (i2) in which the sheet-like optical functional film is peeled from the carrier film shown in fig. 1, the distal end portion of the sheet-like optical functional film is advanced to the panel bonding position, and the panel member standing by at the panel bonding position is sandwiched and bonded, as in fig. 2A to 2C. In fig. 10A to 10C, instead of the two-point-moving-type camera inspection device for reading the rear end portion of the sheet-like optical functional film provided in fig. 2A to 2C, a two-point-set type composite fixed camera inspection device for reading two points is provided, and fig. 10A shows the respective steps of (a1), and (a2) to (C1) and (C2);

FIG. 10B shows the steps of (d1), (d2) and (f1) and (f2) in succession to FIG. 10A;

FIG. 10C shows the steps (g1), (g2), (i1) and (i2) following FIG. 10B;

fig. 11 is a control flowchart showing the detailed steps [ s1] to [ s20] of the manufacturing process of the apparatus for manufacturing an optical display device in which the pair of bonding rollers configured to open and close in the vertical direction with respect to the feeding direction is operated while performing the bonding operation shown in fig. 10A to 10C.

Description of the reference numerals

2: carrier film

3: sheet-like optical functional film

31: rear end portion of sheet-like optical functional film

32: front end of sheet-like optical functional film

4: adhesive layer

5: panel member

10: apparatus for manufacturing optical display device by RTP system

51: pasting roller

52: pasting roller

60: stripping body

61: top of the stripper

70: camera detection device

71: camera detection device

72 a: camera detection device

72 b: camera detection device

8: feeding device for sheet-like optical functional film

80: forward and reverse rotation feed roller

81: forward and reverse rotation feed roller

82: tension roller

90: adsorption conveying device

91: detection device

100: position of panel

200: stop position

300: set position

500: front end position

600: position before pasting

800: control device

802: storage device

Detailed Description

The invention aims to provide a method for manufacturing an optical display device based on an RTP mode.

More specifically, there is provided a method for producing an optical display device by peeling off a sheet-like optical functional film 3 together with an adhesive layer 4 from a carrier film 2 of a belt-like optical film laminate 1 including the carrier film 2, the adhesive layer 4 formed on one surface of the carrier film 2, and a plurality of sheet-like optical functional films 3 continuously supported on the carrier film 2 via the adhesive layer 4, as shown in an enlarged schematic view of fig. 1, and feeding a leading end portion 32 of the sheet-like optical functional film 3 to a panel bonding position 100, overlapping the sheet-like optical functional film 3 with a panel member 5 fed to the panel bonding position 100 in advance, and sandwiching the sheet-like optical functional film 3 and the panel member 5 between a pair of

application rollers

51 and 52 which perform opening and closing operations, and applying the sheet-like optical functional film 3 to the panel member 5 so that the adhesive layer 4 does not deform in a stripe shape.

In examples 1 to 6 according to the embodiment of the present invention, as is clear from the items of "stop rail" and "glue line" shown in fig. 4, the top portion 61 of the release body 60 having the top portion 61 disposed at a position facing the panel bonding position 100 is stopped in a state where the front end portion 32 of the sheet-like optical functional film 3 is not rail-headed, and it is confirmed through experiments that the "glue line" is not generated on the adhesive layer 4 as indicated by the indication of "no" which is not stopped after rail-heading and the indication of "no glue line visually recognizable".

In comparative examples 1 to 3 compared with examples 1 to 6 according to the embodiment of the present invention, as is clear from the items of "stop rail" and "rib" shown in fig. 4, it was confirmed by experiments that the front end portion 32 of the sheet-like optical functional film 3 stopped after rail from the top portion 61 of the release body 60 having the top portion 61 disposed at the position facing the panel bonding position 100 as indicated by "yes" and that the "rib" was generated in the adhesive layer 4 as indicated by × marks such as "visible rib".

However, the prevention of the "striae" is not a technical problem in comparative examples 1 to 3 of fig. 4. As is clear from the item "offset" in FIG. 4, comparative examples 1 to 3 in FIG. 4 have achieved the "engineering capability index C_p"C of_pGood values > 1.67(n is 100) indicate the invention of the misalignment accuracy required for the sheet-like optical functional film and the panel member shown.

In addition, in C_pIn the case of not more than 1.67, the required misalignment accuracy cannot be achieved as indicated by ×, and it is understood that the problem of "striae" which is the technical problem of the present invention is solved in example 3 of the present invention, but the required misalignment accuracy has not been achieved as indicated by × of "misalignment".

Although the technical problem related to the accuracy of the sticking is not a component of the present invention, the speed at which the sheet-like optical functional film 3 at the distal end portion 32 of the sheet-like optical functional film 3 is pulled out from the stop position before the top portion 61 of the peeling body 60 starts running out is related to the speed, and therefore, the details are described in the description related to embodiment 3 of the present invention.

Embodiments including embodiments 1 to 6 of the present invention are described below with reference to the enlarged schematic view of fig. 1, schematic views showing the respective steps (a1), (a2), (i1) and (i2) of fig. 2A to 2C, fig. 8A to 8C and fig. 10A to 10C, and control flowcharts showing the detailed steps [1] to [ s20] of the manufacturing steps of the apparatus 10 for manufacturing the respective optical display devices of fig. 3, 9 and 11.

Fig. 1 is an enlarged schematic view of a panel bonding position 100 of an apparatus 10 for manufacturing an optical display device based on the RTP method. In fig. 1, the feeding device 8 of the sheet-like optical functional film 3 includes a carrier film feeding device that operates in conjunction with the carrier film 2 that is folded back inward on the other side of the top portion 61 of the peeling body 60 and wound around the peeling body 60 without slackening.

The feeding device 8 for the sheet-like optical functional film 3 may include forward and reverse

rotation feeding rollers

80, 81 disposed at least in the front and rear direction with the top portion 61 of the peeling body 60 interposed therebetween. In this case, the feeding device 8 of the sheet-like optical functional film 3 includes a tension roller 82 disposed between the forward and reverse rotation feeding roller 80 and the peeling body 60, another forward and reverse rotation feeding roller 81 serving as a film carrier feeding device, and the like. For example, the carrier film 2 can be wound or rewound without slackening by interlocking the control units 800 shown in fig. 3, 9, and 11. Therefore, by reading the rear end portion 31 of the sheet-like optical functional film 3 and measuring the position of the front end portion 32 of the sheet-like optical functional film 3 by the

camera detection device

70, 71 or 72a and 72b, the correct stroke of the sheet-like optical functional film 3 can be ensured.

Next, the steps and detailed steps common to each of the steps [ s1] to [ s20] common to the steps common to fig. 2A to 2C, fig. 8A to 8C, and fig. 10A to 10C and the steps common to fig. 3, fig. 9, and fig. 11 are shown in detail in fig. 2A to 2C and fig. 3, as follows.

Fig. 2A (a1) and (a2) show a process a in which the front end portion 32 of the sheet-like optical functional film 3 supported on the carrier film 2 is stopped at the stop position 20 on the peeling body 60 without running over the top portion 61 of the peeling body 60 having the top portion arranged at the position facing the panel bonding position 100, and the position and angle of the front end portion 32 of the sheet-like optical functional film 3 at the stop position 200 are confirmed by reading the rear end portion 31 of the sheet-like optical functional film 3.

This is indicated in fig. 3 as "s 1" in which the positional information x1 before the rail of the front end portion 32 of the sheet-like optical functional film 3 detected by the two-point movement type camera inspection device 70 shown in fig. 2A (a1) is measured, and "s 2" in which the positional information x1 is stored in the storage device 802 of the control device 800.

As is clear from fig. 2A (b1) and (b2) and particularly from fig. 2A (b2) or [ s3] of fig. 3, the panel member 5 is sucked and held by the suction-conveying device 90 at the pre-bonding position 600 of the panel member 5, which is prepared for conveying the panel member 5 to the panel bonding position 100.

This is a step of reading the front end position 500 of the panel member 5 held by the suction conveying device 90 detected by the detecting device 91 shown in fig. 1 as the position information x2 in [ s4] of fig. 3, and recording the position information x2 in the storage device 802 of the control device 800 in [ s5] of fig. 3.

In fig. 3, [ S6] is a step of calculating, for example, the offset width and the offset angle (y, θ) in the longitudinal direction by adjusting the position of the panel member 5 held by the suction-conveyance device 90 in advance with respect to the front end portion 32 of the sheet-like optical functional film 3 from the position information x1 before the top end 32 of the sheet-like optical functional film and the position information x2 of the front end position 500 of the panel member 5 recorded in the storage device 802, and [ S7] of fig. 3 is a step of adjusting the position of the panel member 5 held by the suction-conveyance device 90 at the position 600 before the bonding based on the calculation.

Fig. 2A (c1) and (c2) show a step B of stopping and waiting for conveying the panel member 5 to the panel bonding position 100 where the pair of

bonding rollers

51 and 52 are opened. In fig. 3, [ s8], the panel member 5, which has been adjusted in position in advance, is conveyed to the panel bonding position 100, and is stopped at the panel bonding position 100 where the pair of

bonding rollers

51 and 52 are opened.

In fig. 3, [ s9] is a step of moving the two-point-moving-type camera inspection device 70 for reading the rear end 31 of the sheet-like optical functional film 3 from the position for reading the rear end 31 corresponding to the stop position 200 of the front end 32 of the sheet-like optical functional film 3 to the position for reading the rear end 31 corresponding to the time when the front end 32 of the sheet-like optical functional film 3 reaches the predetermined position 300, as shown in fig. 2A (b1), in order to detect the front end 32 of the sheet-like optical functional film 3 reaching the predetermined position 300 between the stop position 200 and the panel bonding position 100, and the moving distance is δ.

Here, the respective steps of fig. 8A to 8C and the flowchart of fig. 9 in which one wide-field single-body fixed-type camera detection device 71 that alternately reads two points is used instead of the 2-point moving-type camera detection device 70 shown in fig. 2A to C will be described;

in the detailed steps of fig. 9, in order to detect the leading end portion 32 of the sheet-like optical functional film 3 that has reached the predetermined position 300 between the stop position 200 and the panel bonding position 100, there is no need to move the two-point movement type camera detection device 70 as shown in [ s9] of fig. 3. In the detailed procedure shown in fig. 9, the single fixed camera detection device 71 that alternately reads two points with a wide field of view switches the photographing between reading the rear end 31 of the front end 32 of the sheet-like optical functional film 3 stopped at the stop position 200 and reading the rear end 31 of the front end 32 reaching the predetermined position 300 to perform the detection. Therefore, the steps in fig. 8A to 8C do not include a step corresponding to [ s9] of fig. 3 in the mobile-unit-fixed-type camera detection device 71.

The respective steps of fig. 10A to 10C and the flowchart of fig. 11, in which the positions of two points are read by the fixed camera detection devices 72A and 72b of two composites provided apart by the distance δ instead of the two-point movement type camera detection device 70 shown in fig. 2A to 2C, will be described.

In the detailed steps of fig. 11, in order to detect the distal end portion 32 of the sheet-like optical functional film 3 that has reached the predetermined position 300 between the stop position 200 and the panel bonding position 100, there is no need to move the fixed

camera detection devices

72a and 72b of the composite body such that the two-point-movement-type camera detection device 70 shown in [ s9] of fig. 3 is moved. The procedure shown in fig. 11 uses the composite fixed

camera detection devices

72a, 72b that read two points, respectively, and first, the rear end portion 31 is read by the fixed camera detection device 72b in [ s1] of fig. 11 to confirm the front end portion 32 of the sheet-like optical functional film 3 stopped at the stop position 200 by the fixed camera detection device 72 b. Next, in fig. 11 [ s11], the fixed camera detection device 72a reads the rear end 31 of the sheet-like optical functional film 3 to confirm the front end 32 of the sheet-like optical functional film 3 reaching the predetermined position 300, and detects the respective positions of the front end 32. Therefore, the steps in fig. 10A to 10C do not include a step of moving the complex-immobilized-type

camera detection devices

72a and 72b as in [ s9] in fig. 3.

Returning to the steps of fig. 2A to 2C or the flowchart of fig. 3, hereinafter, examples 1 to 6 of the present invention will be described with reference to fig. 2A to 2C and 3, and examples 1 to 6 of the present invention include different camera detection devices such as a two-point moving type camera detection device 70, a wide-field single body fixed type

camera detection device

71, and 2 complex fixed type camera detection devices 72A and 72 b.

Both fig. 2B (d1) and fig. 2B (d2) show a step C of conveying the carrier film 2 while folding it back on the top portion 61 of the peeling body 60, thereby peeling the sheet-like optical functional film 3 together with the adhesive layer 4 and conveying the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 on the peeling body 60 to the panel bonding position 100 where the pair of

bonding rollers

51 and 52 are opened, so as to be superposed on the standby panel member 5 without stopping.

In fig. 3, [ s10] is a step of feeding the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 on the peeling member 60 to the panel member 5 waiting at the panel attachment position 100. As shown in fig. 4, the feeding speed v1 of the sheet-like optical functional film 3 for feeding the sheet-like optical functional film 3 is preferably 5mm/s to 10 mm/s. The front end portion 32 of the fed sheet-like optical functional film 3 is superposed on the panel member 5 on standby without stopping.

Fig. 2B (e1) and (e2) show a process H of detecting that the front end portion 32 of the sheet-like optical functional film 3 reaches the predetermined position 300 between the stop position 200 on the peeling body 60 and the panel bonding position 100 by monitoring the distance δ of the feed length of the rear end portion 31 of the sheet-like optical functional film 3. In fig. 3, [ s13], the step of bringing the distal end portion 32 of the sheet-like optical functional film 3 to the predetermined position 300 is shown. Fig. 2B (e1) or [ s14] of fig. 3 also shows a closing operation of the pair of

pasting rollers

51, 52 for starting the opening/closing operation.

As shown in [ s11] and [ s12] of fig. 3, the technical intention of switching the conveying speed of the optical functional film 3 from the feeding speed v1 to the bonding start speed v2 with the panel member 5 before the leading end portion 32 of the sheet-like optical functional film 3 reaches the predetermined position 300 before the panel bonding position is reached is that, since the closing operation of the

bonding rollers

51 and 52 is started with a signal that the leading end portion 32 of the sheet-like optical functional film 3 is detected at the predetermined position 300, the switching of the speed after the leading end portion 32 of the sheet-like optical functional film 3 is detected at the predetermined position 300 is canceled, and the leading end portion 32 of the sheet-like optical functional film 3 is reliably and stably superposed on the panel member 5 without stopping, and the leading end portion 32 of the sheet-like optical functional film 3 and the panel member 5 are sandwiched by the

bonding rollers

51 and 52.

The pasting start speed v2 is the feeding speed of the sheet-like optical functional film 3 when the front end portion 32 of the sheet-like optical functional film 3 overlaps the panel member 5, and as shown in example 3 or example 5 of fig. 4, it can be made the same as the feeding speed v1, but before the front end portion 32 of the sheet-like optical functional film 3 reaches the predetermined position 300 before the panel bonding position, as in example 1, example 2, example 4, or example 6, the pasting start speed v2 is preferably slower than the feeding speed v1, that is, v2< v 1.

More specifically, as shown in fig. 2B (f1), the application start speed v2 of the sheet-like optical functional film 3 sent while being nipped by the pair of

application rollers

51, 52 in the closing action is more preferably less than 10mm/sec because the leading end portion 32 of the sheet-like optical functional film 3 is overlapped on the panel member 5 without stopping.

It is preferable that the pair of

application rollers

51 and 52 rotate at the same speed as the application start speed v2 of the sheet-like optical functional film 3 before sandwiching the sheet-like optical functional film 3 and the panel member 5. By rotating at the same speed v2 from before the nip, a speed difference is less likely to occur at the moment when the

pasting rollers

51, 52 contact the sheet-like optical functional film 3 and the panel member 5, and the pasting accuracy can be further improved.

Fig. 2B (f1) and (f2) show a step I of feeding the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 on the peeling member 60 to the panel bonding position 5 at a feeding speed v1 adjusted to a speed higher than the bonding start speed v2, switching the feeding speed v1 to the bonding start speed v2 before reaching a predetermined position 300 between the stop position 200 on the peeling member 60 and the panel bonding position 5, and overlapping the sheet-like optical functional film on the panel member 5 on standby without stopping.

Fig. 2B (f1) also shows a step of moving back the position of the rear end 31 read by the two-point-moving camera inspection device 70 shown in fig. 2A (B1) from the position at which the front end 32 of the sheet-like optical functional film 3 reaches the predetermined position 300 to the position at which the rear end 31 corresponding to the stop position 200 of the front end 32 of the sheet-like optical functional film 3 is read by δ and returning to the position shown in fig. 2A (a1), which is a step shown in [ s15] of fig. 3.

Fig. 2C (g1) and (g2) show a step of sandwiching the sheet-like optical functional film 3 and the panel member between a pair of joining

rollers

51 and 52 rotating while the leading end portion 32 of the sheet-like optical functional film 3 is overlapped on the joining surface of the panel member 5 without stopping, and further joining the sheet-like optical functional film and the panel member at a joining start speed v 2;

as shown in fig. 2C (g1) and (h1), the leading end portion 32 of the sheet-like optical functional film 3 is nipped between the pair of joining

rollers

51, 52 that are closed, and when the joining of the sheet-like optical functional film 3 and the panel member 5 reaches the predetermined length λ, the joining speed of the pair of joining

rollers

51, 52 that are closed is switched from the joining start speed v2 to the joining operation speed v3 that is higher than the joining start speed v 2. This further improves the productivity of the bonding step of the sheet-like optical functional film 3 and the panel member 5. This is the step shown in s17 of fig. 3.

In the embodiment of the present invention, the relationship between the feeding speed v1, the pasting start speed v2, and the pasting operation speed v3 is as follows.

The feeding speed of the leading end portion 32 of the sheet-like optical functional film 3 from the stop position 200 of the peeling body 60 to the panel bonding position 100 is v 1. Preferably, the feeding speed v1 of the sheet-like optical functional film 3 is maintained until the tip end portion 32 reaches the predetermined position 300 between the stop position 200 on the separator 60 and the panel bonding position 100, and the speed is switched to the bonding start speed v2 before the predetermined position 300. More preferably, the application start speed v2 corresponding to the bonding speed of the pair of

application rollers

51 and 52 in the closing operation is maintained until the distance between the sheet-like optical functional film 3 and the panel member 5 reaches the predetermined length λ, and when the distance reaches the predetermined length λ, the operation speed is further switched to the application operation speed v 3.

Therefore, as shown in examples 1 to 6 of FIG. 4, the velocities of v1 to v3 have the relationship of v 1. gtoreq.v 2, v3> > v1, and preferably have the relationship of v1 > v2, v3> > v1 from the viewpoint of productivity.

Fig. 2C (h1) and (h2) show a step F of cutting the next leading end portion 32 of the sheet-like optical functional film 3 stopped being fed by the feeding device 8 shown in fig. 1 and the trailing end portion 31 of the preceding sheet-like optical functional film 3 conveyed on the panel member 5 by the pair of joining

rollers

51 and 52 rotated by the closing operation at the joining operation speed v3 from each other when the next leading end portion 32 of the sheet-like optical functional film 3 supported on the carrier film 2 joined to the next panel member 5 reaches the stop position 200 on the peeling body 60.

This is shown in fig. 3 as [ s18] in which the bonding operation of the sheet-like optical functional film 3 and the panel member 5 by the pair of

bonding rollers

51 and 52 rotating in the closing operation is continued, while the winding operation of the carrier film 2 is stopped by the feeding device 8 shown in fig. 1, the next leading end portion 32 of the sheet-like optical functional film 3 is stopped at the stop position 200 on the peeling body 60, and the preceding trailing end portion 31 and the next leading end portion 32 are separated by the reverse tension generated thereby.

Fig. 2C (i1) and (i2) show the final steps of the embodiment of the present invention, which are shown as steps [ s19] and [ s20] in fig. 3, and show a final step G of switching the pair of

bonding rollers

51, 52 in the closing operation to the opening operation when the pair of

bonding rollers

51, 52 in the closing operation are operated at the bonding operation speed v3 and the bonding of the sheet-like optical functional film 3 and the panel member 5 is completed as the previous panel member with the sheet-like optical functional film.

Therefore, the final step G is a state shown in fig. 2A (a1) and (a 2). That is, the position and angle of the leading end portion 32 of the next sheet-like optical functional film 3 stopped at the stop position 200 are confirmed by the two-point moving type camera detection device 70, while the pair of joining

rollers

51 and 52 located at the panel joining position 100 are opened, the next panel member 5 stands by at the pre-joining position 600, the pair of opened joining

rollers

51 and 52 are conveyed to the panel joining position 100 in the preparation step, and then the joining steps of the next sheet-like optical functional film 3 and the next panel member 5 are started.

Further, the steps [ s1] to [ s20] of the present invention are similarly performed on the other surface of the panel member with the sheet-like optical functional film obtained in [ s1] to [ s20] of the present invention, which is obtained by bonding the sheet-like optical functional film 3 to one surface of the panel member 5, thereby manufacturing an optical display device in which the sheet-like optical functional films 3 are bonded to both surfaces of the panel member 5.

Here, by again collating the example and the comparative example in fig. 4, the technical problem of the present invention shown in examples 1 to 6 is to prevent the adhesive layer 4 of the sheet-like optical functional film 3 from being deformed by the adhesive marks, and the technical means for achieving this is to stop the leading end portion 32 of the sheet-like optical functional film 3 at the stop position 200 on the release body 60 so as not to protrude from the top portion 61 of the release body 60, that is, so as not to cause a false head.

Next, the front end portion 32 of the sheet-like optical functional film 3 that has been temporarily fed out from the stop position 200 is overlapped on the panel member 5 waiting at the panel bonding position 100 without stopping, and is sandwiched and bonded by the pair of

bonding rollers

51 and 52 that perform the closing operation in conjunction with each other, and the continuous feeding operation is not stopped until the rear end portion 31 of the sheet-like optical functional film 3 is separated from the front end portion 32 of the next sheet-like optical functional film 3.

Further, it is preferable that the leading end portion 32 of the sheet-like optical functional film 3 sent out from the stop position 200 on the peeling body 60 is continuously conveyed at 3 stages at different speeds without stopping. The first speed is a feeding speed v1 that is a speed between a first stroke, i.e., a distance δ, from the stop position 200 on the peeling body 60 to the predetermined position 300 between the panel bonding positions 100.

Next, it is preferable to select the second speed v2 slower than the feeding speed v1 between the second stroke from the predetermined position 300 to the second stroke in which the bonding length between the sheet-like optical functional film 3 and the panel member 5 reaches the predetermined length λ. This technique is intended to overlap the leading end portion 32 of the sheet-like optical functional film 3 on the panel member 5 conveyed in advance to the panel bonding position 100 where the pair of

bonding rollers

51, 52 are opened without stopping, and to sandwich the sheet-like optical functional film 3 and the panel member 5 by the pair of

bonding rollers

51, 52 closed by the closing operation so far, and to bond the sheet-like optical functional film at the bonding start speed v2 without stopping the conveyance of the sheet-like optical functional film 3. If the paste start speed v2 is too fast, adjustment becomes more and more difficult.

When the sheet-like optical functional film 3 and the panel member 5 are bonded together to a predetermined length λ, the subsequent speed can be switched to the normal high-speed bonding operation speed v 3. This is because, as shown in fig. 4, the "offset" phenomenon due to this phenomenon does not occur.

The length δ of the first stroke is about 15 to 25mm, and the length η of the second stroke is composed of a length γ from the predetermined position 300 to the panel bonding position 100 and a predetermined length λ, where (γ + λ) is about 3 to 15mm, γ is about 1 to 5mm, and λ is about 1 to 10 mm.

In each example, example 1 deals with switching the feeding speed v1 to 10mm/s and the sticking start speed v2 to about one-third of 3mm/s before the predetermined position 300, and switching to a high speed of 200mm/s of the sticking operation speed v3 when the leading end portion 32 of the sheet-like optical functional film 3 reaches λ from the start of the sticking operation, that is, when it reaches the length η of the second stroke.

Example 2 also corresponds to the same thing, except that 3mm/s of the speed of the pasting start speed v2 is set to be slightly faster 5 mm/s. In addition, example 4 is also not greatly different from the above. The difference from example 1 is that 10mm/s of the feeding speed v1 was set to 7mm/s slightly slower, and 3mm/s of the pasting start speed v2 was set to 5mm/s slightly faster.

Both results show that no glue line occurs, the standard value of the sticking deviation is reached, and the productivity is good. In contrast, in example 3, since the bonding start speed v2 was too fast at 10mm/s, the front end portion 32 of the sheet-like optical functional film 3 was superimposed on the panel member 5 on standby at a speed v2, and the misalignment was likely to occur at the moment of being sandwiched between the pair of

bonding rollers

51 and 52, and the misalignment was not caused, but the misalignment was affected.

Example 5 confirmed that the productivity was affected to some extent by the feed speed v1 being as slow as 5 mm/s. Although no wrinkles were generated in example 6, the productivity was affected by using a low speed of 5mm/s, which is one-fourth lower than 200mm/s of the high-speed laminating running speed v3 used in the other examples.

In comparative examples 1 to 3 shown in fig. 4, in the method of manufacturing an optical display device by the RTP method, in order to achieve the required bonding accuracy, there is a technical problem how to accurately position the front end portion 32 of the sheet-like optical functional film 3 on the panel member 5, and therefore, as shown in fig. 5 to 7, the front end portion 32 of the sheet-like optical functional film 3 is stopped in a state of being protruded from the peeling body 60.

Specifically, fig. 5 shows a mode in which the tip end portion of the sheet-like optical functional film 3 stopped in a constant head-off state from the top portion 61 of the peeling body 60 is detected, the sheet-like optical functional film 3 is conveyed from the detection position of the tip end portion to the panel bonding position 100, and the sheet-like optical functional film is bonded to the panel member 5 by accurate alignment. Fig. 6 shows a mode in which the front end portion of the next sheet-like optical functional film 3 after the preceding bonding step is detected after the panel bonding position 100 is stopped in a running state, the forward and backward feeding of the sheet-like optical functional film 3 is finely adjusted, and the sheet-like optical functional film is bonded by more accurate position alignment with the panel member 5. Further, in fig. 7, the leading end portion of the next sheet-like optical functional film 3 after the previous bonding step is rolled back to the drawing position provided on the upstream side of the top portion 61 of the peeling body 60, the leading end portion is detected, the sheet-like optical functional film 3 is sent from the drawing position to the panel bonding position 100, and the sheet-like optical functional film is bonded by being aligned with the correct position of the panel member 5 after stopping in a running state.

In the case of the comparative examples shown in fig. 5 to 7, as shown in fig. 4, the accuracy of the sticking deviation was removed, but since all the operations were stopped after the head-off, it was difficult to avoid the deformation of the adhesive layer due to the adhesive marks.

Claims

1. A method for manufacturing an optical display device, wherein a belt-shaped optical film laminate comprising a carrier film, an adhesive layer formed on one surface of the carrier film, and a plurality of sheet-shaped optical functional films continuously supported on the carrier film via the adhesive layer is manufactured by peeling the sheet-shaped optical functional films from the carrier film of the belt-shaped optical film laminate together with the adhesive layer, feeding a leading end portion of the sheet-shaped optical functional films to a panel bonding position, overlapping the leading end portion with a panel member fed to the panel bonding position, and sandwiching and bonding the sheet-shaped optical functional films and the panel member by a pair of bonding rollers that are opened and closed, and the method for manufacturing an optical display device comprises the steps of:

a stop position at which a tip end portion of the sheet-like optically functional film supported by the carrier film is stopped on the peeling member without protruding from the top portion of the peeling member having the top portion arranged at a position facing the panel bonding position;

conveying the panel member to the panel bonding position where the pair of bonding rollers are opened, and stopping and waiting;

folding back and conveying the carrier film at the top of the peeling body, thereby peeling the sheet-like optical functional film together with the adhesive layer, and conveying a leading end portion of the sheet-like optical functional film from a stop position on the peeling body to the panel bonding position so as to overlap the sheet-like optical functional film without stopping the sheet-like optical functional film on the panel member on standby;

switching the pair of application rollers in an open state to perform a closing operation before the leading end portion of the sheet-like optical functional film is overlapped with the panel member waiting at the panel bonding position by detecting that the leading end portion of the sheet-like optical functional film conveyed without stopping reaches a predetermined position between a stop position of the peeling body and the panel bonding position;

the pair of bonding rollers performing a closing operation, while overlapping a leading end portion of the sheet-like optical functional film with the panel member, sandwich the sheet-like optical functional film and the panel member being conveyed without stopping, and bond the sheet-like optical functional film and the panel member;

stopping when the next leading end portion of the sheet-like optical functional film supported on the carrier film reaches the stop position on the peeling body, and separating the stopped next leading end portion of the sheet-like optical functional film and the trailing end portion of the sheet-like optical functional film conveyed while being bonded to the panel member by the rotation of the pair of bonding rollers that perform closing operation and rotate from each other;

after the bonding of the sheet-like optical functional film and the panel member is completed by the pair of bonding rollers, the pair of bonding rollers is opened.

2. The method of manufacturing an optical display device according to claim 1, wherein the pair of pasting rollers that sandwich and laminate the sheet-like optical functional film and the panel member rotate at the same speed as a feed speed of the sheet-like optical functional film when a leading end portion of the sheet-like optical functional film is overlapped with the panel member, before sandwiching the sheet-like optical functional film and the panel member.

3. The method of manufacturing an optical display device according to claim 1 or 2, wherein the arrival of the leading end portion of the sheet-like optical functional film at a predetermined position between a stop position on the peeling body and the panel attaching position is detected by monitoring a feeding distance of the trailing end portion of the sheet-like optical functional film.

4. The method for manufacturing an optical display device according to any one of claims 1 to 3, wherein a leading end portion of the sheet-like optical functional film is overlapped on the panel member, and a bonding start speed v2 of the sheet-like optical functional film conveyed while being nipped by a pair of bonding rollers is less than 10 mm/sec.

5. The method of manufacturing an optical display device according to claim 4, wherein the following steps are provided: and a step of switching the bonding speed of the pair of bonding rollers from the bonding start speed v2 to a bonding operation speed v3 higher than the bonding start speed v2 when the bonding between the sheet-shaped optical functional film and the panel member reaches a predetermined length while the pair of bonding rollers nip the sheet-shaped optical functional film, and the panel member is further bonded.

6. The method of manufacturing an optical display device according to claim 4 or 5, further comprising the steps of: the front end portion of the sheet-like optical functional film is fed from the stop position on the peeling body to the panel bonding position at a feeding speed v1 adjusted to a speed higher than the bonding start speed v2, and is switched from the feeding speed v1 to the bonding start speed v2 before reaching a predetermined position between the stop position on the peeling body and the panel bonding position, so that the front end portion is superimposed on the panel member on standby without stopping.

7. The method of manufacturing an optical display device according to claim 6, wherein the feeding speed v1 at which the leading end portion is fed from the stop position on the peeling body to the panel bonding position, the bonding start speed v2 at which the feeding speed v1 is switched before reaching a predetermined position between the stop position on the peeling body and the panel bonding position, and the bonding running speed v3 at which the bonding speed of the pair of bonding rollers is switched from the bonding start speed v2 when the bonding of the sheet-like optical functional film and the panel member reaches a predetermined length satisfy the following relationship: that is to say that the first and second electrodes,

V1≥V2、V3>>V1。