TW201532787A - Continuous manufacturing method of optical display panels and continuous manufacturing system of optical display panels - Google Patents

Abstract

This manufacturing method involves: a first bonding step in which a first polarizing film is supplied from a first optical film roll and, while optical cells are conveyed, is bonded to the visible surface of the optical cells along the supply direction of the first polarizing film from a pair of opposite sides of the optical cell; and a second bonding step in which a second optical film is removed and supplied from a storage unit storing the second optical film in sheet form, and, while the optical cells are conveyed, is bonded to the back surface of the optical cells along the supply direction of the second film either from the aforementioned pair of opposite sides of the optical cell, or from another pair of opposite sides.

Description

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

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

A continuous manufacturing method of a liquid crystal display panel (so-called roll-to-face system (RTP)) is disclosed in which a first strip having an absorption axis in the longitudinal direction is successively sent from the first optical film roll. The polarizing film is bonded to the surface of the back surface side of the liquid crystal cell by cutting the strip-shaped first polarizing film in the width direction, and is fed out from the second optical film roll. a second polarizing film having a strip-shaped second polarizing film having an absorption axis in the longitudinal direction and having the strip-shaped second polarizing film cut in the widthwise direction is bonded to the viewing side of the liquid crystal cell Face (for example, refer to Patent Document 1). According to the RTP system, a liquid crystal display panel can be continuously produced.

In addition, as a liquid crystal display panel having a high light utilization efficiency, it is disclosed that a first optical film including a polarizing film is bonded to a surface on a viewing side of the liquid crystal cell, and a polarized film is laminated on the surface of the back surface side of the liquid crystal cell. A liquid crystal display panel obtained by a film and a second optical film of a linear polarization separation film (see, for example, Patent Document 2). It is required to continuously produce such a liquid crystal display panel.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent No. 4405034

Patent Document 2: Japanese Patent Laid-Open Publication No. 2002-196141

Patent Document 3: Japanese Patent Laid-Open Publication No. 2004-250213

However, usually, the transmission axes of the polarizing film and the linear polarization separation film are orthogonal to each other. That is, generally, the polarizing film has an absorption axis in the longitudinal direction, and the linear polarization separation film has a reflection axis in the broad direction. Therefore, such a polarizing film and a linear polarization separation film cannot be continuously laminated in a state of a strip-shaped film by a roll-to-roll method or the like, and an optical film roll for an RTP system cannot be manufactured.

For example, in the method of the method described in the patent document 3, the strip-shaped polarizing film laminated from the polarizing film roll is cut into a linear polarizing separation film of a specific size, and then directly wound without being cut by a single piece. Thereby an optical film roll is produced and supplied to the RTP system. However, in this case, as shown in FIG. 4, the boundary line region F of the linear polarization separation film 902 is necessarily generated in the strip-shaped polarizing film 901. Here, considering the adhesion precision and half-cut position accuracy of the linear polarization separation film, the length (gap) of the boundary line region F is about 5 mm (in FIG. 4, the bonding of the strip-shaped polarizing film 901 and the linear polarization separation film 902) The directions are orthogonal to each other, but when the bonding direction is parallel, the length (gap) of the boundary line region F is also about 5 mm. Therefore, if the optical film roll obtained in this manner is directly supplied to the RTP system, in order to separate the polarizing film 901 of the boundary line region F from the product region in the RTP system, it is necessary to perform two half cuts in the broad side direction, and also The step of removing the polarizing film 901 of the boundary line region F is required to make the station time which is an advantage of the RTP system largely sacrificed. Further, since the unnecessary film portion is involved in the bonding step and must be removed, the paste remains when the foreign matter is formed or removed, and the adjacent film is defective due to the residue of the paste. The increase in yield is improved.

Such a problem is not limited to the liquid crystal display panel in which the polarizing film and the linear polarization separation film are laminated on the back side of the liquid crystal cell, and is also intended to continuously produce an optical film which is generally not laminated in a state of a strip film. Optical display of one side of an optical unit New problems arising from the situation of the panel.

The present invention has been made in view of the above problems, and an object thereof is to provide a method and a manufacturing system for an optical display panel capable of producing an optical film in which an area layer of an optical unit cannot be continuously laminated in a state of a strip-shaped film with high yield and continuous production. .

The present invention relates to a method of continuously manufacturing an optical display panel having a first polarizing film on an area of a viewing side of an optical unit, and sequentially arranging a second polarizing film on a surface on the back side of the optical unit. And a linear polarization separation film, the continuous production method comprising: a first bonding step of supplying a first polarizing film having a band shape having an absorption axis in a longitudinal direction from a first optical film roll to a wide side The first polarizing film obtained by cutting in the direction is transported to the optical unit, and the first polarizing film is supplied from the pair of side faces of the optical unit along the supply direction of the first polarizing film. a second bonding film that is attached to the viewing side of the optical unit; and a second bonding step that accommodates a second polarizing film having an absorption axis in the longitudinal direction and a reflection axis in the width direction The accommodating portion of the second optical film in a single state in which the second polarizing film and the linear polarizing separation film are laminated, which are obtained by the strip-shaped linear polarizing separation film, is taken out and supplied to the second optical film, and the optical device is transported. unit, The second optical film is bonded to the back surface side of the optical unit along the supply direction of the second optical film from one side of the opposite direction of the optical unit or the other side of the opposite side of the optical unit.

According to this configuration, the first polarizing film is continuously supplied from the roller and bonded to the viewing side of the optical unit, and the second polarizing film and the linear polarizing film are laminated in a proper arrangement from the accommodating portion. The second optical film in the sheet state is bonded to the back side of the optical unit, and the optical display panel can be produced at high yield and continuously.

In the above invention, the order of the first bonding step and the second bonding step may be Performing either step may be performed simultaneously or partially before and after the attachment process.

An embodiment of the present invention further includes the step of using a second polarizing film having an absorption axis in the longitudinal direction and a band having a reflection axis in the broad direction before the second bonding step. In the linear polarization separation film, a second optical film in a single state in which the second polarizing film and the linear polarization separation film are laminated is formed.

According to this configuration, the effects of the present invention can be preferably obtained. As a method of producing the second optical film in a single sheet state, a conventionally known method such as the method described in JP-A-2004-250213 can be used.

In one embodiment of the invention, the first bonding step and the second bonding step are performed by transporting the optical unit and the optical display panel one of the series of transport units.

According to this configuration, since the first bonding step and the second bonding step can be performed on a series of conveying portions, the optical display panel can be efficiently produced.

According to one embodiment of the invention, in the first bonding step, the bonding direction of the first polarizing film with respect to the optical unit and the second optical film in the second bonding step are opposite to the optical unit The fitting direction is parallel.

In this configuration, for example, when the first polarizing film is bonded to the "one side of the optical unit", the second optical film is bonded to the "one side of the optical unit." By thus making the bonding direction in the first bonding step parallel to the bonding direction of the second optical film (including linear), the tension or stress of the front and back of the optical unit can be balanced, and the optical display panel can be suppressed. Warp.

As an embodiment of the invention, it is preferable that the thickness of the second optical film is larger than the thickness of the first polarizing film. In other words, it is preferable to laminate a film having a larger thickness by a sheet-to-face method (a method in which an optical film formed in a single sheet is bonded to an optical unit, hereinafter also referred to as "STP method"). . The STP method performs the bonding of the optical film by the adsorption of the optical film and the subsequent release thereof, so that the optical film is not subjected to a large tension. Line fit (incorrectly, no greater tension can be applied to the optical film). On the other hand, the RTP method is easy to apply tension because it is a continuous roll film, and conversely, if the film is not subjected to tension (for example, no tension), the problem of occurrence of bubbles or offset is likely to occur, so that it is preferable. The bonding is performed while applying tension to the film. Thus, by relatively thin (stress-concentrated) optical film is attached to one side of the optical unit by STP, and while controlling the tension, the relatively thin (stress-not concentrated) optical film is RTP-based. Bonding to the other side of the optical unit further suppresses warpage of the optical display panel.

According to an embodiment of the invention, the optical unit is a liquid crystal cell of a VA (Vertical Alignment) mode or an IPS (In-Plane Switching) mode.

The invention is particularly suitable for high yield and continuous production of high contrast VA mode or IPS mode liquid crystal display panels.

Further, another aspect of the invention provides a system for continuously manufacturing an optical display panel, wherein the optical display panel has a first polarizing film on an area of the viewing side of the optical unit, and sequentially stacks on the back side of the optical unit. a polarizing film and a linear polarization separation film, the continuous manufacturing system comprising: a series of conveyance units that convey the optical unit and the optical display panel; and a first optical film supply unit that is supplied from the first optical film roll a first polarizing film obtained by cutting a first polarizing film having an absorption axis in a longitudinal direction in a widthwise direction; and a first bonding portion that conveys the above-described one conveyed by the conveying unit In the optical unit, the first polarizing film supplied from the first optical film supply unit is attached to the optical unit from the pair of side faces of the optical unit along the supply direction of the first polarizing film. The second optical film supply unit is provided with a second polarizing film having a band shape having an absorption axis in the longitudinal direction and a linear polarizing band having a reflection axis in the broad side direction. The accommodating portion of the second optical film in a single state in which the second polarizing film and the linear polarizing separation film are laminated, which are obtained by the film separation, is taken out and supplied to the second optical film; and the second bonding portion is conveyed by one surface The optical unit that is transported by the transport unit is configured such that the second optical film supplied from the second optical film supply unit is sideways from the opposite side of the optical unit or opposite to the other side of the optical unit. The supply direction of the second optical film is bonded to the surface on the back side of the optical unit.

According to this configuration, the first polarizing film is continuously supplied from the roller and bonded to the viewing side of the optical unit, and the second polarizing film and the linear polarizing film are laminated in a proper arrangement from the accommodating portion. The second optical film in the sheet state is bonded to the back side of the optical unit, and the optical display panel can be produced at high yield and continuously.

In the above invention, the treatment of the first bonding portion and the processing of the second bonding portion may be performed first, or may be performed simultaneously or repeatedly before and after the attaching process.

In one embodiment of the invention, the first bonding unit and the second bonding unit are disposed on the transport unit that transports the optical unit and the optical display panel.

According to this configuration, since the first bonding portion is disposed on the upper side of the transport portion and the second bonding portion is disposed on the other side, the installation space of the entire device can be reduced.

In one embodiment of the invention, the bonding direction of the first polarizing film to the optical unit and the second optical film of the second bonding portion in the first bonding portion are opposite to the optical unit The fitting direction is parallel.

In this configuration, for example, when the first polarizing film is bonded to the "one side of the optical unit", the second optical film is bonded to the "one side of the optical unit." By thus making the bonding direction in the first bonding step parallel to the bonding direction of the second optical film (including linear), the tension or stress of the front and back of the optical unit can be balanced, and the optical display panel can be suppressed. Warp.

According to an embodiment of the invention, it is preferable that a film thickness of the second optical film is larger than a film thickness of the first polarizing film.

According to an embodiment of the invention, the optical unit is a liquid crystal cell of a VA mode or an IPS mode.

The invention is particularly suitable for high yield and continuous production of high contrast VA mode or IPS mode liquid crystal display panels.

Moreover, another aspect of the invention provides a method of manufacturing an optical display panel having a first optical film on one of the optical unit regions and a second optical film on another area of the optical unit. The manufacturing method includes: In the first bonding step, the first optical film obtained by cutting the strip-shaped first optical film in the width direction is supplied from the first optical film roll, and the optical unit is transported while the optical unit is being transported. The first optical film is bonded to one surface of the optical unit from a pair side of the optical unit in a direction in which the first optical film is supplied; and In the second bonding step, the second optical film is taken out from the accommodating portion of the second optical film in a single sheet in which the optical film of the two or more layers which are not continuously laminated in the state of the strip film is contained, and is supplied to the second optical film. While the optical unit is being transported, the second optical film is bonded to the second optical film in the direction in which the second optical film is supplied from one side of the opposite side of the optical unit or the other side of the opposite side of the optical unit. The other side of the optical unit.

Further, another aspect of the invention is a system for manufacturing an optical display panel having a first optical film on one area layer of the optical unit and a second optical film on another area layer of the optical unit, and the manufacturing system includes a first bonding unit that supplies the first optical film obtained by cutting the strip-shaped first optical film in the width direction from the first optical film roll, and transports the optical unit while The first optical film is bonded to one surface of the optical unit from a pair of side faces of the optical unit along a direction in which the first optical film is supplied; and the second bonding portion cannot be stacked with a layer. The accommodating portion of the second optical film in a single sheet in which the optical film of the two or more layers is continuously laminated in the state of the strip film is taken out and supplied to the second optical film, and the optical unit is transported from the optical unit. Correct The second optical film is bonded to the other surface of the optical unit along the supply direction of the second optical film toward the side of one of the groups or the other side of the pair.

According to the above-described manufacturing method or manufacturing system, the first optical film is continuously supplied from the roll and bonded to one surface of the optical unit, and the layer is not continuously laminated in the state of the strip film by being supplied in an appropriate arrangement relationship from the accommodating portion. The second optical film in a single state in which two or more optical films are formed is bonded to the other surface of the optical unit, and the optical display panel can be produced at high yield and continuously.

In the present invention, for example, a method of supplying an optical film from an optical film roll may be exemplified by the following methods: (1) feeding of an optical film formed by laminating a strip-shaped optical film on a carrier film from an optical film roll. An optical film obtained by laminating an optical film and cutting a strip-shaped optical film in a broad direction; (2) a film from an optical film (an optical film roll with a slit) is successively fed on a carrier film in a broad direction A strip-shaped laminated optical film formed by forming a strip-shaped optical film of a plurality of dicing lines is supplied to the optical film; either method can be used.

1‧‧‧Optical film roll

10‧‧‧1st laminated optical film

11‧‧‧1st polarizing film

11a‧‧‧ membrane body

11b‧‧‧Adhesive

12‧‧‧1st carrier film

21‧‧‧2nd optical film

41‧‧‧1st cut-off

41a‧‧‧ Cut off the device

41b‧‧‧Adsorption device

51‧‧‧1st tension adjustment department

61‧‧‧1st peeling section

71‧‧‧1st Volume

81, 82‧‧‧Fitting Department

81a, 81b‧‧‧ affixing rolls

82a‧‧‧Finishing roller

82b‧‧‧Adsorption Department

82c‧‧‧ drive roller

100‧‧‧Continuous Manufacturing System

101‧‧‧1st Optical Film Supply Department

101a‧‧‧1st volume

101b‧‧‧Transporting roller

102‧‧‧2nd optical film supply unit

102c‧‧‧Receiving Department

111‧‧‧1st polarizing film

211‧‧‧Linear polarized separation membrane

212‧‧‧2nd polarizing film

213‧‧‧Adhesive

214‧‧‧ release film

901‧‧‧ polarizing film

902‧‧‧Linear polarized separation membrane

F‧‧‧ Junction line area

LD‧‧‧LCD panel

P‧‧‧Liquid Crystal Unit

Pa‧‧‧faced side

Pb‧‧‧ face on the back side

X‧‧‧Transport Department

X1‧‧‧Transport roller

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

Fig. 2 is a view showing a first bonding portion in the first embodiment;

Fig. 3 is a view showing a second bonding portion in the first embodiment;

Fig. 4 is a view showing the process of laminating a linear polarizing separation film in a strip-shaped polarizing film.

<Embodiment 1>

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

In the present embodiment, a liquid crystal cell having a laterally rectangular shape will be described as an example of the optical unit. As the optical display panel, a liquid crystal display panel having a rectangular rectangular shape will be described as an example. As the optical film roll, as shown in Figure 1, Figure 2, Figure 3 By. In other words, as the first optical film roll 1, a first laminated optical film 10 in a strip shape is used, and the strip-shaped first laminated optical film 10 is laminated on the first carrier film 12 in the longitudinal direction. The first polarizing film 11 (corresponding to the first optical film) having a band shape of the absorption axis has a width corresponding to the short side of the liquid crystal cell P.

The second optical film 21 in a single-piece state is produced 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 broad direction. Specifically, as a method of producing the second optical film in a single sheet state, a conventionally known method such as the method described in JP-A-2004-250213 or the like can be used. For example, a method in which each of the second polarizing film and the linear polarized film is formed in a single-piece state and laminated is used, or either one of them is in a single-piece state in advance, and the other is a strip-shaped film. A method of laminating a film in a strip shape in a single sheet state. When bonded to the liquid crystal cell, the absorption axes of the first polarizing film 111 and the second polarizing film 212 are mutually orthogonally polarized.

Further, in the present embodiment, as shown in FIG. 2, the strip-shaped first polarizing film 11 includes a strip-shaped film main body 11a and an adhesive 11b. As shown in FIG. 3, the second optical film 21 in a single-piece state is laminated with a linear polarization separation film 211, a second polarizing film 212, and an adhesive 213, and a release film 214 as a protective agent for the adhesive 213 is temporarily adhered.

As shown in FIG. 1 , the continuous manufacturing system 100 of the liquid crystal display panel of the present embodiment includes a transport unit X for transporting the liquid crystal cell P and the liquid crystal display panel LD, a first optical film supply unit 101, and a first bonding unit 81. The second optical film supply unit 102 and the second bonding unit 82 are provided.

(transport department)

The transport unit X transports the liquid crystal unit P and the liquid crystal display panel LD. The conveying unit X includes a plurality of conveying rollers X1, an adsorption plate, and the like.

(first optical film supply unit)

The first optical film supply unit 101 supplies the first polarizing film 111 from the first optical film roll 1 to the first bonding unit 81, and the first optical film roll 1 has a short side corresponding to the liquid crystal cell P. The strip-shaped first polarizing film 11 having a width is obtained by cutting in the width direction in accordance with the length corresponding to the long side of the liquid crystal cell P. Therefore, in the first embodiment, the first optical film supply unit 101 includes the first winding unit 101a, the first cutting unit 41, the first tension adjusting unit 51, the first peeling unit 61, and the first winding unit 71, And a plurality of conveying roller portions 101b.

The first unwinding portion 101a includes a winding shaft that is provided with the first optical film roll 1, and the first laminated optical film 10 is sequentially fed from the first optical film roll 1. Further, the first winding portion 101a may include two winding shafts. Thereby, the film of the roller provided on the other winding shaft can be quickly attached without replacing the roller 1 with a new one.

The first cutting portion 41 includes the cutting device 41a and the adsorption device 41b, and the strip-shaped first laminated optical film 10 is half-cut in the width direction in accordance with the length corresponding to the long side of the liquid crystal cell P (the first laminated optical film 10 is not cut. The carrier film 12 is used to cut the strip-shaped first polarizing film 11) in the width direction. In the present embodiment, the first cut-off portion 41 is used to cut and fix the strip-shaped first laminated optical film 10 from the first carrier film 12 side by using the adsorption device 41b, and cut the tape in the widthwise direction using the cutting device 41a. In the first polarizing film 11 (the film main body 11a and the adhesive 11b), the first polarizing film 111 having a size corresponding to the liquid crystal cell P is formed on the first carrier film 12. Further, examples of the cutting device 41a include a cutter, a laser device, a combination thereof, and the like.

The first tension adjusting portion 51 has a function of maintaining the tension of the strip-shaped first laminated optical film 10. In the present embodiment, the first tension adjusting unit 51 includes a dancer roller, but the present invention is not limited thereto.

The first peeling portion 61 is formed by folding back the strip-shaped first laminated optical film 10 with the first carrier film 12 being inside, and peeling off the first polarizing film 111 from the first carrier film 12 . Examples of the first peeling portion 61 include a wedge member, a roller, and the like.

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 portion 71 includes a take-up shaft for providing a roller for winding the first carrier film 12.

(1st bonding part)

The first bonding portion 81 is such that the longitudinal direction of the liquid crystal cell P is parallel to the transport direction. The first polarizing film 111 supplied from the first optical film supply unit 101 (separated by the first peeling portion 61) is transported from the short side of the liquid crystal cell P along the liquid crystal cell P transported by the transport unit X. The supply direction of the first polarizing film 111 (the longitudinal direction of the liquid crystal cell P) is bonded to the surface Pa of the liquid crystal cell P on the viewing surface side via the adhesive 11b. Further, the first bonding portion 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 second optical film supply unit 102 takes out the second optical film 21 in a single state from the container 102c in which the second optical film 21 is placed in a single state, and supplies it to the bonding position of the second bonding portion 82. In the present embodiment, the second bonding unit 82 is used to take out and supply the second bonding unit 82.

(2nd bonding part)

The second bonding film 82 is configured to transport the liquid crystal cell P transported by the transport unit X so that the longitudinal direction of the liquid crystal cell P is parallel to the transport direction, and the second optical film supplied from the second optical film supply unit 102 is supplied. 21 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 portion (not shown) that moves the second optical film 21 in a single state from the accommodating portion 102c to the bonding position, and the peeling portion (not shown) from the single-chip state. The second optical film 21 peels off the release film 214 in a single sheet state; the adsorption portion 82b adsorbs the second optical film 21 in a single sheet state; the bonding roller 82a; and the driving roller 82c which is in surface contact with the liquid crystal cell P The liquid crystal unit P is transported.

The accommodating portion 102c is not limited to the embodiment described in FIGS. 1 and 3, and may have another shape. For example, the accommodating portion 102c may be a container having a mounting table for placing the second optical film 21 in a single piece state, and the mounting table is also Can be covered around it.

The moving portion is moved to the second optical film 21 placed in a single state of the accommodating portion 102c, and the surface of the second optical film 21 is adsorbed by the adsorption portion 82b, and moved to the bonding position.

The peeling portion peels the release film 214 in a single sheet state from the second optical film 21 in a single sheet state. For example, an adhesive tape can be used for the peeling portion, and the adhesive tape can be attached to the surface of the release film 214 and adhered. The belt is moved to thereby peel off the release film 214.

The second optical film 21 in a single state, which is adsorbed on the adsorption portion 82b, is fed to the bonding roller 82a at the distal end position, and the bonding roller 82a is rotated to bond the second optical film 21 to the liquid crystal from the short side. On the back side Pb of the unit P. At this time, the liquid crystal cell P and the second optical film 21 are inserted into the downstream side by the drive roller 82c and the bonding roller 82a. Further, the driving roller 82c and the bonding roller 82a may both be driving mechanisms, and the driving roller 82c may be a driven mechanism.

In the present embodiment, the first optical film supply unit and the second optical film supply unit are disposed 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, so that the device can be reduced. Occupy the space. Further, in the present embodiment, the bonding direction of the first polarizing film 111 with respect to the liquid crystal cell P in the first bonding portion 81 and the second optical film 21 in the second bonding portion 82 are opposed to the liquid crystal cell P. Since the bonding direction is parallel, the warpage of the liquid crystal cell P after bonding can be preferably suppressed.

(Another embodiment of the first embodiment)

In the present embodiment, the first bonding portion and the second bonding portion are arranged in this order along the transport direction of the liquid crystal cell P depending on the transport unit X, but the present invention is not limited thereto. The order of the first bonding portion and the second bonding portion may be reversed.

In the first embodiment, the first bonding portion is bonded to the first polarizing film from the lower side of the liquid crystal cell, and the second bonding portion is bonded to the second optical film from the upper side of the liquid crystal cell. However, the second bonding film is not limited thereto. The first bonding portion may be bonded to the first polarizing film from the upper side of the liquid crystal cell, and the second bonding portion may be bonded to 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 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, and the second optical film is attached. 21 is bonded to the surface Pb of the back surface side of the liquid crystal cell P from the short side of the liquid crystal cell P along the supply direction of the second optical film, but the absorption axis of each of the polarizing films on the viewing side and the back side of the liquid crystal cell is positive. It is not limited to this in the form of cross-nicol bonding. The first polarizing film 111 can be bonded to the long side of the liquid crystal cell P from the long side of the liquid crystal cell P When the second optical film 21 is bonded, the first polarizing film 111 can be bonded to the long side of the liquid crystal cell P, and the second optical film 21 can be bonded from the short side of the liquid crystal cell P, or can be short from the liquid crystal cell P. The first polarizing film 111 is bonded to the side, and the second optical film 21 is bonded to the long side of the liquid crystal cell P. However, the width and the cut size of the second optical film are set in accordance with bonding from the long side of the liquid crystal cell or by bonding the second optical film from the short side.

(Continuous manufacturing method of optical display panel)

The continuous manufacturing method of the optical display panel of the first embodiment is a method of continuously manufacturing an optical display panel having a first polarizing film on the area of the viewing side of the optical unit and facing the back side of the optical unit. The second polarizing film and the linear polarizing separation film are sequentially laminated, and the continuous manufacturing method includes: The first bonding step is a step of supplying the first polarizing film obtained by cutting the first polarizing film having an absorption axis in the longitudinal direction from the first optical film roll in the width direction. While the optical unit is being transported, the first polarizing film is bonded to the viewing side of the optical unit along the supply direction of the first polarizing film from the side opposite to the optical unit; and a bonding step obtained by accommodating a 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 broad direction. The accommodating portion of the second optical film in a single state in which the second polarizing film and the linear polarizing separation film are taken out and supplied to the second optical film, and the optical unit is transported, and the optical unit is opposed to the optical unit. The second optical film is bonded to the surface on the back side of the optical unit along the supply direction of the second optical film on the side or the other side of the pair.

Further, the first bonding step and the second bonding step are performed by transporting the optical unit and one of the optical display panels. Further, in the first bonding step, the bonding direction of the first polarizing film with respect to the optical unit is parallel to the bonding direction of the second optical film with respect to the optical unit in the second bonding step.

(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 linear polarization separation film are laminated, but the invention is not limited thereto. As the second optical film, a laminated optical film in which a broadband retardation film and a polarizing film are laminated is exemplified. The wide-band retardation film is exemplified by a film in which a λ/4 retardation film and a λ/2 retardation film are laminated.

(variation of the first embodiment)

In the first embodiment, the optical film roll is used in a strip-shaped laminated optical film in which a belt-shaped optical film is wound around a carrier film. However, the configuration of the optical film roll is not limited thereto. For example, a strip-shaped laminated optical film (an optical film roll with a slit) in which a belt-shaped optical film in which a plurality of slit lines are formed in a broad direction is wound around a carrier film can be suitably used. Further, in the optical film supply portion to which the optical film roll having the slit is supplied to the optical film, the cut portion is not required.

In the first embodiment, the cut portion is formed by cutting a strip-shaped optical film in the width direction, thereby forming an optical film having a size corresponding to the optical unit on the carrier film, but in terms of improving yield, The strip-shaped optical film is cut (jump-cut) in a wide-side direction so as to avoid the defective portion of the strip-shaped optical film, and an optical film having a size corresponding to the optical unit is formed on the carrier film (adhered to In addition to the optical film of the optical unit, the optical film containing the defective portion may be formed smaller than the optical unit (more preferably, as small as possible). In the present invention, as each of the optical film rolls, a strip-shaped optical film in which a plurality of slit lines are formed in a wide-side direction so as to be formed by laminating on the carrier film to avoid the defective portion is formed on the carrier film. An optical film of a size corresponding to the optical unit (an optical film bonded to a good optical unit) is also wound to form a strip containing a defective portion in a smaller size than the optical unit (more preferably, as small as possible) The laminated optical film (the optical film roll with a slit) can also effectively improve the yield. Further, the optical film including the defective portion is preferably peeled off from the carrier film and discharged, or taken up together with the carrier film to the winding portion or the like without being attached to the optical unit. The same applies to the case of using a slit film of an optical film roll or the use of a full cut of a strip-shaped laminated optical film in the width direction.

In the first embodiment, an optical unit and an optical display panel having a laterally rectangular shape will be described as an example. However, the shape of the optical unit and the optical display panel may be such that they have a pair of opposite sides and a pair of opposite sides. There is no particular limitation.

(optical film)

The film main body of the polarizing film is formed with, for example, a polarizing element (having a thickness of usually about 1 to 80 μm) and a protective film for a polarizing element (having a thickness of usually about 1 to 500 μm), and the protective film of the polarizing element is attached to one side or both sides of the polarizing element. It is formed with or without an adhesive. The polarizing element usually extends in the direction of the absorption axis. A polarizing film including a long-length polarizing element having an absorption axis in the longitudinal direction is also referred to as an "MD (Machine Direction) polarizing film", and also includes a long-length polarizing element having an absorption axis in the broad-side direction. The polarizing film is called a "TD (Transverse Direction) polarizing film". Examples of the other film constituting the film main body include a retardation film (having a thickness of usually 10 to 200 μm) such as a λ/4 plate or a λ/2 plate, a viewing angle compensation film, a brightness enhancement film, and a surface protection film. The thickness of the laminated optical film is, for example, in the range of 10 μm to 500 μm.

The polarizing element is obtained, for example, by dyeing, crosslinking, stretching, and drying a polyvinyl alcohol-based film. The respective processes of dyeing, cross-linking, and stretching of the polyvinyl alcohol-based film need not be carried out separately or simultaneously, and the order of the respective treatments may be arbitrary. Further, as the polyvinyl alcohol-based film, a polyvinyl alcohol-based film which has been subjected to swelling treatment can also be used. In general, a polyvinyl alcohol-based film is immersed in a solution containing iodine or a dichroic dye, and is dyed by adsorbing iodine or a dichroic dye, and is extended by 3 times to 7 times in a solution containing boric acid or borax. After the magnification is uniaxially stretched, it is washed and dried.

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

(bearing film)

As the carrier film, for example, a conventionally known film such as a plastic film (for example, a polyethylene terephthalate film or a polyolefin film) can be used. Further, if necessary, a coating agent such as a polyfluorene-based or long-chain alkyl-based, fluorine-based or molybdenum-containing molybdenum may be used as appropriate according to the prior art. Further, the carrier film is also commonly referred to as a release film (spacer film). The release film 214 of the first embodiment can be the same as the carrier film.

(linear polarized separation film)

The film main body of the linear polarization separation film is, for example, a reflective polarizing film having a multilayer structure of a reflection axis and a transmission axis. The reflective polarizing film is obtained, for example, by alternately laminating a plurality of polymer films A and B of two different materials and extending them. In the extending direction, only the refractive index of the material A changes and exhibits birefringence, and the direction in which the refractive index difference at the material AB interface extends is the reflection axis, and the direction in which the refractive index difference does not occur (non-extension direction) becomes the transmission axis. The reflective polarizing film has a transmission axis in the longitudinal direction thereof and a reflection axis in the short side direction (wide direction). As the reflective polarizing film, a commercially available product can be used as it is, or a commercially available product can be used twice (for example, extended). As a commercial item, the brand name DBEF by 3M company, and the brand name APF by 3M company are mentioned, for example.

(liquid crystal cell, liquid crystal display panel)

The liquid crystal cell has a configuration in which a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side) Pa) and a second substrate (back surface) Pb). The liquid crystal cell can be of any type, but in order to achieve high contrast, a liquid crystal cell of a vertical alignment (VA) mode or a transverse electric field effect (IPS) mode is preferably used. The liquid crystal display panel is attached to a single side or both sides of the liquid crystal cell with a polarizing film, and the driving circuit is incorporated as needed.

(Organic EL (electroluminescence) unit, organic EL display panel)

The organic EL unit is configured by sandwiching an electric field light-emitting layer between a pair of electrodes. The organic EL unit can use, for example, a top illumination method, a bottom illumination method, and a two-way illumination (double- Elevation type and other types. The organic EL display panel is attached to a single side or both sides of the organic EL unit to which a polarizing film is attached, and the driving circuit is incorporated as needed.

81, 82‧‧‧Fitting Department

100‧‧‧Continuous Manufacturing System

101‧‧‧1st Optical Film Supply Department

102‧‧‧2nd optical film supply unit

LD‧‧‧LCD panel

P‧‧‧Liquid Crystal Unit

X‧‧‧Transport Department

X1‧‧‧Transport roller

Claims (2)

A method of manufacturing an optical display panel, wherein the optical display panel has a first optical film on one area layer of the optical unit and a second optical film on another area layer of the optical unit, and the manufacturing The method includes a first bonding step of supplying the first optical film obtained by cutting a strip-shaped first optical film in a widthwise direction from a first optical film roll, and transporting the optical unit And attaching the first optical film to one side of the optical unit from the side opposite to the optical unit, and attaching it to one surface of the optical unit; and the second bonding step The accommodating portion of the second optical film in a single sheet in which the optical film of the two or more layers which are continuously laminated in the state of the strip film is taken out and supplied to the second optical film, and the optical unit is transported while The second optical film is bonded to the other surface of the optical unit along the supply direction of the second optical film in the direction in which the optical unit is opposed to one side or the other side. A manufacturing system for an optical display panel, which is a system for manufacturing an optical display panel, wherein the optical display panel has a first optical film on one area layer of the optical unit and a second optical film on another area layer of the optical unit, and the manufacturing The system includes a first bonding unit that supplies the first optical film obtained by cutting the strip-shaped first optical film in the width direction from the first optical film roll, and transports the optical unit. The first optical film is bonded to one side of the optical unit from a pair side of the optical unit in a direction in which the first optical film is supplied, and the second bonding unit is provided with a layer. It is not possible to take out and supply the second optical film in the accommodating portion of the second optical film in a single sheet in which the optical film of two or more layers is continuously laminated in the state of a strip film, and transport the optical unit from the light. The second optical film is bonded to the other surface of the optical unit along the supply direction of the second optical film on one side of the pair or the other side of the opposite direction.