JP2014095832A - Method and system for continuously manufacturing optical display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high-yield continuous manufacturing of an optical display panel comprising an optical film, which cannot be continuously laminated in a strip film state, laminated on one surface of an optical cell.SOLUTION: A continuous manufacturing method for an optical display panel includes: a first adhesion step in which a first polarizing film is fed from a first optical film roll and adhered on a viewing-side surface of an optical cell being conveyed, from a side of a pair of opposing sides of the optical cell in a feeding direction of the first polarizing film; and a second adhesion step in which a sheet of second optical film is taken out and fed from a storage unit storing sheets of the second optical film and adhered on a back-side surface of the optical cell being conveyed, from the side of the pair of opposing sides or from a side of another pair of opposing sides in a feeding direction of the second optical film.

Description

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

The first polarizing film obtained by feeding out a strip-shaped first polarizing film having an absorption axis in the longitudinal direction from the first optical film roll and cutting the strip-shaped first polarizing film in the width direction is used as the liquid crystal cell. The first obtained by pasting to the back side surface, feeding out a strip-shaped second polarizing film having an absorption axis in the longitudinal direction from the second optical film roll, and cutting the strip-shaped second polarizing film in the width direction. A continuous manufacturing method (a so-called Roll to Panel (RTP) system) of a liquid crystal display panel in which a two-polarized film is bonded to the surface on the viewing side of the liquid crystal cell is disclosed (for example, see Patent Document 1). According to this RTP system, liquid crystal display panels can be continuously produced.

By the way, as a liquid crystal display panel with high light utilization efficiency, a first optical film including a polarizing film is bonded to the surface on the viewing side of the liquid crystal cell, and a polarizing film and a linearly polarized light separating film are arranged in this order on the back surface of the liquid crystal cell. A liquid crystal display panel in which a laminated second optical film is bonded is disclosed (for example, see Patent Document 2). Such a liquid crystal display panel is also required to be continuously produced.

Patent No. 4406043 JP 2002-196141 A JP 2004-250213 A

  However, normally, the transmission axes of the polarizing film and the linearly polarized light separating film are orthogonal to each other. That is, normally, the polarizing film has an absorption axis in the longitudinal direction, and the linearly polarized light separating film has a reflection axis in the width direction. Therefore, such a polarizing film and a linearly polarized light separating film cannot be continuously laminated in a strip-like film state by a Roll to Roll method or the like, and an optical film roll for an RTP system cannot be manufactured.

For example, referring to the method described in Patent Document 3, after laminating a linearly polarized light separating film cut to a predetermined size on a band-shaped polarizing film fed out from a polarizing film roll, the sheet is cut as it is. It is not unthinkable to produce an optical film roll by winding and use it for an RTP system. However, in this case, as shown in FIG. 4, a boundary region F of the linearly polarized light separating film 902 is inevitably generated in the strip-shaped polarizing film 901. Here, the length (gap) of the boundary region F is about 5 mm in consideration of the accuracy of attaching the linearly polarized light separating film and the accuracy of the half-cut position (in FIG. 4, the band-shaped polarizing film 901 and the linearly polarized light separating film 902). The length (gap) of the boundary region F is about 5 mm in the same manner when the bonding directions are parallel to each other. Therefore, if the optical film roll obtained in this way is used as it is for the RTP system, in order to separate the polarizing film 901 in the boundary region F from the product region in the RTP system, it is necessary to make two half cuts in the width direction. In addition, a process for removing the polarizing film 901 in the boundary region F is also required, and the tact that is a merit of the RTP system is greatly sacrificed. In addition, since such unnecessary film portions need to intervene in the bonding process and need to be removed, bonded foreign matter is generated, or the adjacent non-defective film deteriorates due to adhesive residue or adhesive residue at the time of removal. The possibility that the yield will decrease increases.

  Such a problem is not limited to the liquid crystal display panel in which the polarizing film and the linearly polarized light separating film described above are laminated on the back side of the liquid crystal cell. This is a new problem that arises when trying to continuously produce an optical display panel laminated on one side.

  The present invention has been made in view of the above-described problems, and continuously produces an optical display panel in which an optical film that cannot be continuously laminated in the state of a belt-like film is laminated on one surface of an optical cell with high yield. An object of the present invention is to provide a manufacturing method and a manufacturing system capable of performing the above.

In the present invention, an optical display panel in which a first polarizing film is laminated on a surface on the viewing side of an optical cell and a second polarizing film and a linearly polarized light separating film are laminated in this order on a surface on the back side of the optical cell. The method of manufacturing automatically,
The first polarizing film obtained by cutting the strip-shaped first polarizing film having an absorption axis in the longitudinal direction in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first A first bonding step of bonding a polarizing film to a surface on the viewing side of the optical cell along a supply direction of the first polarizing film from a pair of sides facing the optical cell;
The second polarizing film obtained by using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linearly polarizing separation film having a reflection axis in the width direction are laminated. The second optical film is taken out and supplied from the storage unit in which the second optical film in a single wafer state is stored, and the optical cell is transported while the optical cell is transported. A second laminating step of laminating the second optical film to a surface on the back side of the optical cell along a supply direction of the second optical film from a set of sides.

  According to this configuration, the first polarizing film is continuously supplied from the roll and bonded to the viewing side of the optical cell, and the second polarizing film and the linearly polarized light separating film are laminated in advance in an appropriate arrangement relationship. By supplying the second optical film in a single wafer state from the housing unit and bonding it to the back side of the optical cell, it is possible to produce the optical display panel continuously with a high yield.

In the said invention, whichever may be performed first and the order of a 1st bonding process and a 2nd bonding process may be performed, and the simultaneous or pasting process period may overlap partially before and behind.

  As one embodiment of the invention, before the second bonding step, a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linearly polarized light separating film having a reflection axis in the width direction are used. The method further includes a step of producing a second optical film in a single wafer state in which the second polarizing film and the linearly polarized light separating film are laminated.

  According to this structure, the effect of this invention can be acquired suitably. As a method for producing the second optical film in a single wafer state, a conventionally known method such as a method described in JP-A-2004-250213 can be used.

  As one Embodiment of the said invention, a said 1st bonding process and a said 2nd bonding process are performed on a series of conveyance parts which convey the said optical cell and the said optical display panel.

  According to this structure, since a 1st bonding process and a 2nd bonding process can be performed on a series of conveyance parts, an optical display panel can be produced efficiently.

  As one Embodiment of the said invention, the bonding direction of the said 1st polarizing film in the said 1st bonding process with respect to the said optical cell and the bonding direction of the said 2nd optical film in a said 2nd bonding process are parallel. It is.

  In this configuration, for example, when the first polarizing film is bonded from “a pair of sides facing the optical cell”, the second optical film is also bonded from “a pair of sides facing the optical cell”. Thus, by making the bonding direction in the first bonding step and the bonding direction of the second optical film parallel (including linear shapes), it is possible to cancel tension and stress on the front and back surfaces of the optical cell. , Warpage of the optical display panel can be suppressed.

  As one embodiment of the above invention, the thickness of the second optical film is preferably larger than the thickness of the first polarizing film. That is, it is preferable to perform an optical film having a larger thickness by a sheet to panel method (a method in which an optical film that has been previously made into a single wafer is bonded to an optical cell, hereinafter also referred to as “STP method”). In the STP method, since the optical film is bonded through adsorption and release from the optical film, the optical film is bonded without applying a large tension. It is not possible to apply a large tension to it). On the other hand, since the RTP method is a continuous roll film, it is easy to apply tension, and conversely, if the film is bonded without applying tension (for example, free of tension), there is a problem of bubble generation and sticking displacement. Since it is likely to occur, it is preferable to perform bonding while applying tension to the film. Therefore, a relatively thick (stress accumulation) optical film is bonded to one surface of the optical cell by the STP method, and a relatively thin (stress accumulation difficult) optical film is optically controlled by the RTP method while controlling the tension. By bonding to the other surface of the cell, warpage of the optical display panel can be further suppressed.

  As one embodiment of the invention, the optical cell is a VA mode or IPS mode liquid crystal cell.

  The present invention is particularly suitable for continuously producing a high-contrast VA mode or IPS mode liquid crystal display panel with a high yield.

Another aspect of the present invention is an optical display in which a first polarizing film is laminated on the viewing side surface of an optical cell, and a second polarizing film and a linearly polarized light separating film are laminated in this order on the back side surface of the optical cell. A system for continuously manufacturing panels,
A series of transport units for transporting the optical cell and the optical display panel;
A first optical film supply section for supplying the first polarizing film obtained by cutting the strip-shaped first polarizing film having an absorption axis in the longitudinal direction from the first optical film roll;
While transporting the optical cell transported by the transport unit, the first polarizing film supplied by the first optical film supply unit is moved from the pair of sides facing the optical cell to the first polarizing film. A first bonding part to be bonded to the surface on the viewing side of the optical cell along the supply direction;
The second polarizing film obtained by using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linearly polarizing separation film having a reflection axis in the width direction are laminated. A second optical film supply unit that takes out and supplies the second optical film from a storage unit in which the second optical film in a single wafer state is stored;
While transporting the optical cell transported by the transport unit, the second optical film supplied by the second optical film supply unit is opposed to one set of sides of the optical cell or another set of facing. And a second bonding portion that is bonded to the back surface of the optical cell along the supply direction of the second optical film from the side.

  According to this configuration, the first polarizing film is continuously supplied from the roll and bonded to the viewing side of the optical cell, and the second polarizing film and the linearly polarized light separating film are laminated in advance in an appropriate arrangement relationship. By supplying the second optical film in a single wafer state from the housing unit and bonding it to the back side of the optical cell, it is possible to produce the optical display panel continuously with a high yield.

  In the said invention, either the process of a 1st bonding part and the process of a 2nd bonding part may be performed first, and the simultaneous or the bonding process period may partially overlap before and behind.

  As one Embodiment of the said invention, a said 1st bonding part and a said 2nd bonding part are arrange | positioned at the said conveyance part which conveys the said optical cell and the said optical display panel.

  According to this structure, since a 1st bonding part is arrange | positioned in the upper or lower one side of a conveyance part and a 2nd bonding part is arrange | positioned by the other side, the installation space of the whole installation can be made small.

  As one Embodiment of the said invention, the bonding direction of the said 1st polarizing film in a said 1st bonding part with respect to the said optical cell and the bonding direction of the said 2nd optical film in a said 2nd bonding part are parallel. It is.

  In this configuration, for example, when the first polarizing film is bonded from “a pair of sides facing the optical cell”, the second optical film is also bonded from “a pair of sides facing the optical cell”. Thus, by making the bonding direction in the first bonding step and the bonding direction of the second optical film parallel (including linear shapes), it is possible to cancel tension and stress on the front and back surfaces of the optical cell. , Warpage of the optical display panel can be suppressed.

  As one embodiment of the invention, it is preferable that the film thickness of the second optical film is larger than the film thickness of the first polarizing film.

  As one embodiment of the invention, the optical cell is a VA mode or IPS mode liquid crystal cell.

  The present invention is particularly suitable for continuously producing a high-contrast VA mode or IPS mode liquid crystal display panel with a high yield.

Another aspect of the present invention is a method of manufacturing an optical display panel in which a first optical film is laminated on one surface of an optical cell and a second optical film is laminated on the other surface of the optical cell,
The first optical film obtained by cutting the band-shaped first optical film in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first optical film is removed from the optical cell. A first bonding step of bonding to one surface of the optical cell along the supply direction of the first optical film from a pair of opposing sides;
The second optical film is taken out and supplied from a housing part in which a second optical film in a single wafer state in which two or more optical films that cannot be laminated continuously in a belt-like film state are laminated, and the optical cell is supplied. While transporting, the second optical film is attached to the other surface of the optical cell along the supply direction of the second optical film from one set of opposite sides of the optical cell or another set of opposite sides. A second bonding step to be combined.

Another aspect of the present invention is a system for manufacturing an optical display panel in which a first optical film is laminated on one surface of an optical cell and a second optical film is laminated on the other surface of the optical cell,
The first optical film obtained by cutting the band-shaped first optical film in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first optical film is removed from the optical cell. A first bonding portion to be bonded to one surface of the optical cell along the supply direction of the first optical film from a pair of opposing sides;
The second optical film is taken out and supplied from a housing part in which a second optical film in a single wafer state in which two or more optical films that cannot be laminated continuously in a belt-like film state are laminated, and the optical cell is supplied. While transporting, the second optical film is attached to the other surface of the optical cell along the supply direction of the second optical film from one set of opposite sides of the optical cell or another set of opposite sides. And a second bonding part to be combined.

  According to the manufacturing method or the manufacturing system described above, the first optical film is continuously supplied from a roll and bonded to one surface of the optical cell, and two or more optical films that cannot be continuously stacked in a belt-like film state An optical display panel can be produced at a high yield and continuously by supplying a second optical film in a single wafer state, which is appropriately laminated, from the housing unit and bonding the second optical film to the other surface of the optical cell.

  In this specification, as a method of supplying an optical film from an optical film roll, for example, (1) a belt-like laminated optical film in which a belt-like optical film is laminated on a carrier film is fed out from the optical film roll. A method of supplying an optical film obtained by cutting the optical film in the width direction, (2) From the optical film roll (notched optical film roll), a plurality of score lines in the width direction are formed on the carrier film. Examples of the method include a method of feeding a belt-shaped laminated optical film formed by laminating the formed belt-shaped optical film and supplying the optical film, and any of them can be used.

Schematic of the continuous manufacturing system of the optical display panel of Embodiment 1. The figure which shows the 1st bonding part of Embodiment 1. The figure which shows the 2nd bonding part of Embodiment 1. Diagram showing the process of laminating a linearly polarized light separating film on a band-shaped polarizing film

<Embodiment 1>
1 to 3 are schematic views of a continuous manufacturing system for an optical display panel according to the first embodiment. Hereinafter, the continuous manufacturing system of the optical display panel according to the present embodiment will be specifically described with reference to FIGS.

  In this embodiment, a horizontally long liquid crystal cell is used as an optical cell, and a horizontally long liquid crystal display panel is used as an example of an optical display panel. As the optical film roll, those shown in FIGS. 1, 2, and 3 are used. That is, as the first optical film roll 1, a strip-shaped first polarizing film 11 (corresponding to the first optical film) having an absorption axis in the longitudinal direction is laminated on the first carrier film 12, and the liquid crystal cell P The belt-shaped first laminated optical film 10 having a width corresponding to the short side is wound.

  The sheet-like second optical film 21 is manufactured using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linearly polarized light separating film having a reflection axis in the width direction. Specifically, as a method for producing the second optical film in a single wafer state, a conventionally known method such as a method described in JP-A No. 2004-250213 can be used. For example, a method in which each of the second polarizing film and the linearly polarized light separating film is laminated in a single sheet state in advance, or one of the second polarizing film and the linearly polarized light separating film is preliminarily formed into a single sheet state, and the other is used as a strip film. The method of laminating | stacking the film of a state is mentioned. When bonded to the liquid crystal cell, the absorption axes of the first polarizing film 111 and the second polarizing film 212 are in a crossed Nicols relationship.

  Furthermore, in this embodiment, the strip | belt-shaped 1st polarizing film 11 has a strip | belt-shaped film main body 11a and the adhesive 11b, as shown in FIG. As shown in FIG. 3, the second optical film 21 in a single wafer state is formed by laminating a linearly polarized light separating film 211, a second polarizing film 212, and an adhesive 213, and a release film 214 is temporarily attached to protect the adhesive 213. Has been.

  As shown in FIG. 1, the continuous manufacturing system 100 for a liquid crystal display panel according to the present embodiment includes a series of transport units X that transport the liquid crystal cells P and the liquid crystal display panel LD, a first optical film supply unit 101, 1 bonding part 81, the 2nd optical film supply part 102, and the 2nd bonding part 82 are included.

(Transport section)
The transport unit X transports the liquid crystal cell P and the liquid crystal display panel LD. The conveyance unit X includes a plurality of conveyance rollers X1, a suction plate, and the like.

(First optical film supply unit)
The first optical film supply unit 101 is obtained by cutting the strip-shaped first polarizing film 11 having a width corresponding to the short side of the liquid crystal cell P in the width direction with a length corresponding to the long side of the liquid crystal cell P. The first polarizing film 111 is supplied from the first optical film roll 1 to the first bonding unit 81. Therefore, in this embodiment, the 1st optical film supply part 101 is the 1st delivery part 101a, the 1st cutting part 41, the 1st tension adjustment part 51, the 1st peeling part 61, the 1st winding part 71, and several Transport roller portion 101b.

  The first feeding unit 101 a has a feeding shaft on which the first optical film roll 1 is installed, and feeds the strip-shaped first laminated optical film 10 from the first optical film roll 1. The first feeding unit 101a may be provided with two feeding shafts. Thereby, it is possible to quickly join the roll 1 to the roll film installed on the other feeding shaft without replacing the roll 1 with a new roll.

  The first cutting part 41 is configured to have cutting means 41a and suction means 41b, and half-cuts the strip-shaped first laminated optical film 10 in the width direction with a length corresponding to the long side of the liquid crystal cell P (first). 1) The band-shaped first polarizing film 11 is cut in the width direction without cutting the carrier film 12). In the present embodiment, the first cutting unit 41 uses the cutting unit 41a to fix the band-shaped first laminated optical film 10 from the first carrier film 12 side by using the suction unit 41b, and fixes the band-shaped first polarized light. The film 11 (the film body 11 a and the adhesive 11 b) is cut in the width direction, and the first polarizing film 111 having a size corresponding to the liquid crystal cell P is formed on the first carrier film 12. The cutting means 41a includes a cutter, a laser device, a combination thereof, and the like.

  The first tension adjusting unit 51 has a function of maintaining the tension of the belt-like first laminated optical film 10. In the present embodiment, the first tension adjusting unit 51 is configured to include a dancer roll, but is not limited thereto.

  The first peeling unit 61 peels the first polarizing film 111 from the first carrier film 12 by folding the belt-shaped first laminated optical film 10 with the first carrier film 12 inside. Examples of the first peeling portion 61 include a wedge-shaped member and a roller.

  The first winding unit 71 winds up the first carrier film 12 from which the first polarizing film 111 has been peeled off. The first winding unit 71 has a winding shaft on which a roll for winding the first carrier film 12 is installed.

(1st bonding part)
The 1st bonding part 81 was supplied by the 1st optical film supply part 101, conveying the liquid crystal cell P conveyed by the conveyance part X, making the long side direction parallel to a conveyance direction (1st peeling part). A surface Pa on the viewing surface side of the liquid crystal cell P from the short side of the liquid crystal cell P along the supply direction of the first polarizing film 111 (long side direction of the liquid crystal cell P). Are bonded together via an adhesive 11b. The first bonding unit 81 includes a pair of bonding rollers 81a and 81b, and at least one of the bonding rollers 81a and 81b includes a driving roller.

(Second optical film supply unit)
The 2nd optical film supply part 102 takes out the 2nd optical film 21 of a sheet | seat state from the container 102c in which the 2nd optical film 21 of the sheet | seat state was accommodated, and supplies it to the bonding position of the 2nd bonding part 82. . In this embodiment, it takes out and supplies using the 2nd bonding part 82 mentioned later.

(2nd bonding part)
The 2nd bonding part 82 is the 2nd optical film 21 supplied by the 2nd optical film supply part 102, conveying the liquid crystal cell P conveyed by the conveyance part X with the long side direction parallel to a conveyance direction. Is bonded to the surface Pb on the back side of the liquid crystal cell P from the short side of the liquid crystal cell P.

  The second bonding unit 82 includes a moving unit (not shown) that moves the sheet-shaped second optical film 21 from the housing unit 102c to the bonding position, and a sheet-fed release film 214 that has a sheet-fed state. 2 The liquid crystal cell P is conveyed in contact with the surface of the liquid crystal cell P, a peeling portion (not shown) that peels from the optical film 21, a suction portion 82b that adsorbs the second optical film 21 in a single wafer state, a bonding roller 82a. Drive roller 82c.

  The storage portion 102c is not limited to the form described in FIGS. 1 and 3 and may have other shapes, for example, a container having a mounting table for mounting the second optical film 21 in a single wafer state. The pedestal may be covered around it.

  A moving part moves to the 2nd optical film 21 of the sheet | seat state mounted in the accommodating part 102c, and adsorb | sucks the surface of the 2nd optical film 21 by the adsorption | suction part 82b, and moves to a bonding position.

  The peeling unit peels the single-sheet release film 214 from the single-sheet second optical film 21. The peeling unit may peel the release film 214 by bonding the adhesive tape to the surface of the release film 214 using, for example, an adhesive tape and moving the adhesive tape.

  The second optical film 21 in a single wafer state adsorbed by the adsorbing part 82b is sent to the laminating roller 82a at the tip position, and the laminating roller 82a is rotated to be on the surface Pb on the back side of the liquid crystal cell P. The second optical film 21 is bonded from the short side. At this time, the driving roller 82c and the bonding roller 82a sandwich the liquid crystal cell P and the second optical film 21 and convey them downstream. The driving roller 82c and the bonding roller 82a may be driven together, or the driving roller 82b may be driven.

  In the present embodiment, the first optical film supply unit and the second optical film supply unit are arranged in the transport unit X of the liquid crystal cell so that the supply directions of the first polarizing film and the second optical film are parallel to each other. Therefore, the space occupied by the apparatus can be reduced. Moreover, in this embodiment, the bonding direction of the 1st polarizing film 111 in the 1st bonding part 81 with respect to liquid crystal cell P and the bonding direction of the 2nd optical film 21 in the 2nd bonding part 82 are parallel. Therefore, warpage of the liquid crystal cell P after bonding can be suitably suppressed.

(Another embodiment of Embodiment 1)
In this embodiment, although the 1st bonding part and the 2nd bonding part are located in this order along the conveyance direction of the liquid crystal cell P by the conveyance part X, it is not restrict | limited to this. The order of a 1st bonding part and a 2nd bonding part may be reverse.

  In the present embodiment, the first bonding unit bonds the first polarizing film from the lower side of the liquid crystal cell, and the second bonding unit bonds the second optical film from the upper side of the liquid crystal cell. It is not limited to. The first bonding unit may bond the first polarizing film from the upper side of the liquid crystal cell, and the second bonding unit may bond the second optical film from the lower side of the liquid crystal cell.

  In the present embodiment, the first polarizing film 111 is bonded to the surface Pa on the viewing side of the liquid crystal cell P along the supply direction of the first polarizing film 111 from the short side of the liquid crystal cell P, and the second optical film 21. Is bonded to the surface Pb on the back side of the liquid crystal cell P along the supply direction of the second optical film from the short side of the liquid crystal cell P. As long as it is bonded so that the absorption axis is orthogonal (crossed Nicols), it is not limited to this. The first polarizing film 111 may be bonded from the long side of the liquid crystal cell P, the second optical film 21 may be bonded from the long side of the liquid crystal cell P, and the first polarizing film 111 may be bonded to the long side of the liquid crystal cell P. The second optical film 21 may be bonded from the short side of the liquid crystal cell P, the first polarizing film 111 may be bonded from the short side of the liquid crystal cell P, and the second optical film 21 may be bonded to the liquid crystal cell P. You may stick together from the long side. However, the width and cutting size of the second optical film are set according to whether the second optical film is bonded from the long side or the short side of the liquid crystal cell.

(Continuous manufacturing method for optical display panels)
In the continuous manufacturing method of the optical display panel of Embodiment 1, the first polarizing film is laminated on the viewing side surface of the optical cell, and the second polarizing film and the linearly polarized light separating film are formed on the back side surface of the optical cell. A method for continuously producing optical display panels laminated in order,
The first polarizing film obtained by cutting the strip-shaped first polarizing film having an absorption axis in the longitudinal direction in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first A first laminating step of laminating a polarizing film from a pair of opposing sides of the optical cell to a surface on the viewing side of the optical cell along the supply direction of the first polarizing film; and an absorption axis in the longitudinal direction. A sheet-shaped second polarizing film obtained by laminating the second polarizing film obtained by using a strip-shaped second polarizing film having a reflection axis in the width direction and a linear polarizing separation film. 2 The second optical film is taken out from the housing part containing the optical film and supplied, and the optical cell is conveyed while the optical cell is opposed to one set of sides or the other set of sides. And a second bonding step of bonding the second optical film along the feed direction of the second optical film on the back side surface of the optical cell.

  Moreover, a said 1st bonding process and a said 2nd bonding process are performed on a series of conveyance parts which convey the said optical cell and the said optical display panel. Moreover, the bonding direction of the said 1st polarizing film in the said 1st bonding process with respect to the said optical cell and the bonding direction of the said 2nd optical film in a said 2nd bonding process are parallel.

(Another example of the second optical film)
In the present embodiment, the second optical film is a laminated optical film in which a polarizing film and a linearly polarized light separating film are laminated, but is not limited thereto. Examples of the second optical film include a laminated optical film in which a broadband retardation film and a polarizing film are laminated. The broadband retardation film is exemplified by a film in which a λ / 4 retardation film and a λ / 2 retardation film are laminated.

(Modification of Embodiment 1)
In Embodiment 1, as the optical film roll, a roll-shaped laminated optical film obtained by laminating a band-shaped optical film on a carrier film is used, but the configuration of the optical film roll is not limited to this. For example, by appropriately using a belt-shaped laminated optical film formed by laminating a band-shaped optical film in which a plurality of score lines are formed in the width direction on a carrier film (a cut optical film roll). Also good. In addition, a cutting part becomes unnecessary in the optical film supply part which supplies an optical film from the optical film roll with a notch.

  In the first embodiment, the cutting unit cuts the band-shaped optical film in the width direction and forms the optical film having a size corresponding to the optical cell on the carrier film. However, from the viewpoint of improving the yield, the band-shaped optical film is formed. The band-shaped optical film is cut in the width direction (skip cut) so as to avoid the defective part of the optical film of the optical film of the size corresponding to the optical cell on the carrier film (the non-defective optical that is bonded to the optical cell) In addition to forming a film, an optical film including a defect portion may be formed in a size smaller than the optical cell (more preferably in a size as small as possible). In the present invention, as each optical film roll, a band-shaped optical film formed in the width direction so that a plurality of score lines avoid a defective portion is laminated on the carrier film, and corresponds to an optical cell on the carrier film. In addition to an optical film of a size (a non-defective optical film to be bonded to an optical cell), an optical film including a defective portion is formed in a size smaller than the optical cell (more preferably in a size as small as possible). Similarly, the yield can be effectively improved by using a roll-shaped laminated optical film (an optical film roll having a cut). In addition, it is preferable that the optical film including the defective portion is peeled off from the carrier film and discharged, or wound around the winding portion together with the carrier film so as not to be bonded to the optical cell. The same applies to the case where an optical film roll with cuts is used or the case where a full cut is used in the width direction of a band-shaped laminated optical film.

  In the first embodiment, a horizontally-long rectangular optical cell and an optical display panel have been described as examples. However, the shape of the optical cell and the optical display panel includes a pair of opposing sides and another pair of opposing sides. As long as it is a shape, it is not particularly limited.

(Optical film)
The film body of the polarizing film is, for example, a polarizer (thickness is generally about 1 to 80 μm) and a polarizer protective film (thickness is generally about 1 to 500 μm) attached to one or both sides of the polarizer. Formed without an agent or adhesive. A polarizer usually has an absorption axis in the stretching direction. A polarizing film including a long polarizer having an absorption axis in the longitudinal direction is also referred to as “MD polarizing film”, and a polarizing film including a long polarizer having an absorption axis in the width direction is also referred to as “TD polarizing film”. Other films constituting the film body include, for example, retardation films such as λ / 4 plates and λ / 2 plates (thickness is generally 10 to 200 μm), viewing angle compensation films, brightness enhancement films, surface protection films, etc. Is mentioned. As for the thickness of a laminated optical film, the range of 10 micrometers-500 micrometers is mentioned, for example.

  The polarizer is obtained, for example, by dyeing, crosslinking, stretching, and drying a polyvinyl alcohol film. Each treatment of dyeing, crosslinking and stretching of the polyvinyl alcohol film need not be performed separately and may be performed simultaneously, and the order of the treatments may be arbitrary. In addition, you may use the polyvinyl alcohol-type film which gave the swelling process as a polyvinyl-alcohol-type film. Generally, a polyvinyl alcohol film is immersed in a solution containing iodine or a dichroic dye, dyed by adsorbing iodine or a dichroic dye, and stretched 3 times in a solution containing boric acid or borax. After uniaxial stretching at ˜7 times, it is washed and dried.

  The pressure-sensitive adhesive is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a urethane pressure-sensitive adhesive. The layer thickness of the pressure-sensitive adhesive is preferably in the range of 10 μm to 50 μm, for example. Examples of the peeling force between the pressure-sensitive adhesive and the carrier film include 0.15 (N / 50 mm width sample), but are not particularly limited thereto. The peeling force is measured according to JIS Z0237.

(Carrier film)
As the carrier film, for example, a conventionally known film such as a plastic film (for example, a polyethylene terephthalate film, a polyolefin film, or the like) can be used. In addition, if necessary, an appropriate material according to the prior art such as a silicone-based, long-chain alkyl-based, fluorine-based or molybdenum sulfide-coated material may be used. The carrier film is generally called a release film (separator film). As the release film 214 of Embodiment 1, the same film as the carrier film can be used.

(Linear polarized light separation film)
As for the film main body of a linearly polarized light separation film, the reflective polarizing film of the multilayer structure which has a reflection axis and a transmission axis is mentioned, for example. The reflective polarizing film can be obtained, for example, by alternately laminating and stretching a plurality of polymer films A and B of two different materials. The refractive index of only material A increases and changes in the stretching direction, birefringence is developed, and the stretching direction having a difference in refractive index at the interface of material AB becomes the reflection axis, and the direction in which no refractive index difference occurs (non-stretching direction). It becomes the transmission axis. This reflective polarizing film has a transmission axis in its longitudinal direction and a reflection axis in its short direction (width direction). As the reflective polarizing film, a commercially available product may be used as it is, or a commercially available product may be used after secondary processing (for example, stretching). As a commercial item, 3M company brand name DBEF and 3M company brand name APF are mentioned, for example.

(Liquid crystal cell, liquid crystal display panel)
The liquid crystal cell has a structure in which a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side surface) Pa and a second substrate (back surface) Pb) disposed to face each other. Although any type of liquid crystal cell can be used, it is preferable to use a vertical alignment (VA) mode or in-plane switching (IPS) mode liquid crystal cell in order to achieve high contrast. A liquid crystal display panel has a polarizing film bonded to one or both sides of a liquid crystal cell, and a drive circuit is incorporated as necessary.

(Organic EL cell, organic EL display panel)
The organic EL cell has a configuration in which an electroluminescent layer is sandwiched between a pair of electrodes. As the organic EL cell, for example, an arbitrary type such as a top emission method, a bottom emission method, a double emission method, or the like can be used. The organic EL display panel has a polarizing film bonded to one or both sides of an organic EL cell, and a drive circuit is incorporated as necessary.

1 Optical film roll 81, 82 Bonding part P Liquid crystal cell LD Liquid crystal display panel

Claims (12)

A first polarizing film is laminated on the surface of the optical cell on the viewing side, and an optical display panel in which the second polarizing film and the linearly polarized light separating film are laminated in this order on the back surface of the optical cell is continuously manufactured. A method,
The first polarizing film obtained by cutting the strip-shaped first polarizing film having an absorption axis in the longitudinal direction in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first A first bonding step of bonding a polarizing film to a surface on the viewing side of the optical cell along a supply direction of the first polarizing film from a pair of sides facing the optical cell;
The second polarizing film obtained by using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linear polarizing separation film having a reflection axis in the width direction are laminated. The second optical film is taken out and supplied from the storage unit in which the second optical film in a single wafer state is stored, and the pair of sides facing the optical cell or facing each other while conveying the optical cell. A second bonding step of bonding the second optical film to a surface on the back side of the optical cell along the supply direction of the second optical film from another set of sides, and continuously manufacturing an optical display panel Method.   Before the second bonding step, the second polarizing film and the second polarizing film using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linearly polarized light separating film having a reflection axis in the width direction. The continuous manufacturing method of the optical display panel of Claim 1 which further includes the process of producing the 2nd optical film of the sheet | seat state formed by laminating | stacking a linearly polarized light separation film.   The manufacturing method of the optical display panel of Claim 1 or 2 with which a said 1st bonding process and a said 2nd bonding process are performed on a series of conveyance parts which convey the said optical cell and the said optical display panel. .   The bonding direction of the said 1st polarizing film in the said 1st bonding process with respect to the said optical cell and the bonding direction of the said 2nd optical film in a said 2nd bonding process are parallel, Claims 1-3. The manufacturing method of the optical display panel of any one of these.   The method of manufacturing an optical display panel according to claim 1, wherein the optical cell is a VA mode or IPS mode liquid crystal cell. A system for continuously manufacturing an optical display panel in which a first polarizing film is laminated on the surface of the optical cell on the viewing side, and a second polarizing film and a linearly polarized light separating film are laminated in this order on the back surface of the optical cell. Because
A series of transport units for transporting the optical cell and the optical display panel;
A first optical film supply section for supplying the first polarizing film obtained by cutting the strip-shaped first polarizing film having an absorption axis in the longitudinal direction from the first optical film roll;
While transporting the optical cell transported by the transport unit, the first polarizing film supplied by the first optical film supply unit is moved from the pair of sides facing the optical cell to the first polarizing film. A first bonding part to be bonded to the surface on the viewing side of the optical cell along the supply direction;
The second polarizing film obtained by using a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and a strip-shaped linear polarizing separation film having a reflection axis in the width direction are laminated. A second optical film supply unit that takes out and supplies the second optical film from the storage unit in which the second optical film in a single wafer state is stored;
While transporting the optical cell transported by the transport unit, the second optical film supplied by the second optical film supply unit is opposed to one set of sides of the optical cell or another set of facing. A continuous manufacturing system for an optical display panel, comprising: a second bonding portion that is bonded to a surface on the back side of the optical cell along a supply direction of the second optical film from the side.   The second polarizing film and the linearly polarized light separating film are laminated using a belt-like second polarizing film having an absorption axis in the longitudinal direction and a belt-like linearly polarized light separating film having a reflective axis in the width direction. The continuous production system for an optical display panel according to claim 6, further comprising a production unit for producing a second optical film in a single wafer state.   The said 1st bonding part and a said 2nd bonding part are the manufacturing systems of the optical display panel of Claim 6 or 7 arrange | positioned at the said conveyance part which conveys the said optical cell and the said optical display panel.   The bonding direction of the first polarizing film in the first bonding portion and the bonding direction of the second optical film in the second bonding portion with respect to the optical cell are parallel to each other. The manufacturing system of the optical display panel of any one of these.   The optical display panel manufacturing system according to any one of claims 6 to 9, wherein the optical cell is a VA mode or IPS mode liquid crystal cell. A method of manufacturing an optical display panel in which a first optical film is laminated on one side of an optical cell and a second optical film is laminated on the other side of the optical cell,
The first optical film obtained by cutting the band-shaped first optical film in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first optical film is removed from the optical cell. A first bonding step of bonding to one surface of the optical cell along the supply direction of the first optical film from a pair of opposing sides;
The second optical film is taken out and supplied from a housing part in which a second optical film in a single wafer state in which two or more optical films that cannot be laminated continuously in a belt-like film state are laminated, and the optical cell is supplied. While transporting, the second optical film is attached to the other surface of the optical cell along the supply direction of the second optical film from one set of opposite sides of the optical cell or another set of opposite sides. The manufacturing method of an optical display panel including the 2nd bonding process to match | combine. A system for manufacturing an optical display panel in which a first optical film is laminated on one side of an optical cell and a second optical film is laminated on the other side of the optical cell,
The first optical film obtained by cutting the band-shaped first optical film in the width direction is supplied from the first optical film roll, and while transporting the optical cell, the first optical film is removed from the optical cell. A first bonding portion to be bonded to one surface of the optical cell along the supply direction of the first optical film from a pair of opposing sides;
The second optical film is taken out and supplied from a housing part in which a second optical film in a single wafer state in which two or more optical films that cannot be laminated continuously in a belt-like film state are laminated, and the optical cell is supplied. While transporting, the second optical film is attached to the other surface of the optical cell along the supply direction of the second optical film from one set of opposite sides of the optical cell or another set of opposite sides. The manufacturing system of an optical display panel containing the 2nd bonding part to match | combine.