TWI524985B - A continuous manufacturing method of an optical display panel and a continuous manufacturing system for an optical display panel - Google Patents

A continuous manufacturing method of an optical display panel and a continuous manufacturing system for an optical display panel Download PDF

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Publication number
TWI524985B
TWI524985B TW102140736A TW102140736A TWI524985B TW I524985 B TWI524985 B TW I524985B TW 102140736 A TW102140736 A TW 102140736A TW 102140736 A TW102140736 A TW 102140736A TW I524985 B TWI524985 B TW I524985B
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TW
Taiwan
Prior art keywords
optical
optical film
film
unit
display panel
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Application number
TW102140736A
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Chinese (zh)
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TW201422415A (en
Inventor
Kazuya Hada
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Nitto Denko Corp
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Priority to JP2012247682A priority Critical patent/JP5782010B2/en
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of TW201422415A publication Critical patent/TW201422415A/en
Application granted granted Critical
Publication of TWI524985B publication Critical patent/TWI524985B/en

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    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1303Apparatus specially adapted to the manufacture of LCDs
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

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 (RTP) method) 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 widthwise 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).
In the above RTP system, when the optical film is bonded to the substrate, the bonding stress or the shrinkage stress of the film attached to the front surface and the back surface (the first surface and the second surface of the substrate) may be different. The liquid crystal display panel generates warpage. In recent years, there have been a large number of polarizing plates having asymmetrical front and back faces, and there has been a case where liquid crystal display panels are more likely to warp (see, for example, Patent Documents 3 and 4).
Prior technical literature Patent literature
Patent Document 1: Japanese Patent No. 4307510
Patent Document 2: Japanese Patent Laid-Open Publication No. 2009-271516
Patent Document 3: Japanese Patent Laid-Open Publication No. 2012-32559
Patent Document 4: Japanese Patent Laid-Open Publication No. 2012-53077
As a strategy for coping with the warpage of the above liquid crystal display panel, it is considered to control the warpage by controlling the tension at the time of attachment. That is, a method is considered in which the warp state at the time of attachment is warped in the direction opposite to the opposite side of the attachment surface, and the attachment is performed with excessive tension. However, in the case where the both sides of the liquid crystal cell are attached by RTP as before, a film having an absorption axis in the same direction is generally used, and in this case, the attachment direction with respect to the liquid crystal cell tends to be orthogonal. That is, since the attachment directions are not parallel, stress cannot be balanced on the front and back surfaces of the liquid crystal cell, and it is difficult to correct warpage.
On the other hand, when the optical film (optical sheet) in a single state is attached to both sides of the liquid crystal cell (hereinafter also referred to as a "STP (Sheet to Panel) method), the RTP method is used. Different, the degree of freedom is higher, and the attachment direction can be freely changed, so that the attachment directions of the front and back films are parallel. However, in the case of the STP method, the film is attached while adsorbing the film at the adsorption stage, so that a large tension cannot be applied, and the tension value cannot be freely controlled, and it can only be a natural tension value.
That is, it is presumed that when both surfaces of the liquid crystal cell are attached by the RTP method or the STP method, it is not suitable for applying a tension for balancing the stress required for warpage.
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 manufacturing an optical display panel for manufacturing an optical display panel in which warpage is generated.
The present invention is a method for continuously manufacturing an optical display panel having a first optical film on one area layer of an optical unit and a second optical film on another area layer of the optical unit, and the continuous manufacturing method includes : a first bonding step of supplying a first optical film in a strip shape from a first optical film roll The first optical film obtained by cutting in the width direction and carrying the optical unit, the first optical film is along the side of the optical unit from the side of the optical unit along the first optical film The supply direction is bonded to one surface of the optical unit, and the second bonding step is performed by taking out the second optical film from the accommodating portion of the second optical film in a single state, and transporting the optical unit. The second optical film is bonded to the other surface of the optical unit from the side opposite to the side of the optical unit along the supply direction of the second optical film.
According to this configuration, when an optical film (for example, a polarizing film) having the same optical axis (for example, an absorption axis) is attached to an optical unit (for example, a liquid crystal cell), it is attached by RTP on one side and STP on the other side. Attached, so that the attachment direction can be parallel (including the same). Further, by providing an RTP method capable of freely setting a single surface from no tension to excessive tension, the degree of freedom can be ensured for the bonding direction and the tension control, and the front surface of the optical unit can be easily realized. The balance of the stresses on the back surface (the first surface and the second surface) is uniform (substantially identical and substantially uniform), and the warpage of the optical display panel can be suppressed.
In the above invention, the order of the first bonding step and the second bonding step may be performed in any of the steps, or may be simultaneously performed or repeated before and after the attachment process.
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.
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 bond the optical film having a larger thickness in a sheet-to-face manner (the optical film previously formed in a single sheet is bonded to the optical unit, hereinafter also referred to as "STP method"). In the STP method, the optical film is bonded to and removed from the optical film, so that the optical film is not subjected to a large tension and is bonded (correctly, a large tension cannot 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 no tension is applied to the film (for example, no When the tension is applied, the problem of occurrence of bubbles or offset is likely to occur, so that the film is applied 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.
In an embodiment of the invention, the absorption axis of the first optical film bonded to one surface of the optical display panel and the absorption axis of the second optical film bonded to the other surface are orthogonal to each other, and are wound around the first optical In the state of the film roll, the absorption axis of the first optical film is located in the longitudinal direction, and the absorption axis of the strip-shaped second optical film for producing the second optical film in the monolithic state is located in the longitudinal direction.
With this configuration, it is possible to manufacture a high contrast optical display panel in which warpage is suppressed.
According to an embodiment of the invention, the optical unit is a liquid crystal cell of a VA mode or an IPS mode.
The present invention is particularly suitable for producing a high contrast VA mode or IPS mode liquid crystal display panel in which warpage is suppressed.
Furthermore, another aspect of the present invention provides a system for continuously manufacturing an optical display panel having a first optical film on one area of an optical unit and a second optical film on another area layer of the optical unit, and The continuous manufacturing system includes a series of conveyance units that convey the optical unit and the optical display panel, and a first optical film supply unit that supplies the first optical film in a strip shape from the first optical film roll to the wide side The first optical film obtained by cutting in the direction; the first bonding unit conveys the first optical film supplied from the first optical film supply unit while conveying the optical unit conveyed by the transfer unit Optical unit One of the pair of side faces is attached to one surface of the optical unit along the supply direction of the first optical film, and the second optical film supply unit is taken out from the accommodating part of the second optical film in which the single piece is accommodated. The second optical film is supplied to the second optical film, and the optical unit that is transported by the transport unit is transported, and the second optical film supplied from the second optical film supply unit is supplied from the optical unit. The opposite side of one of the groups is bonded to the other surface of the optical unit along the supply direction of the second optical film.
According to this configuration, when an optical film (for example, a polarizing film) having the same optical axis (for example, an absorption axis) is attached to an optical unit (for example, a liquid crystal cell), it is attached by RTP on one side and STP on the other side. Attached, so that the attachment direction can be parallel (including the same). Further, by adopting an RTP method capable of freely setting a single surface from no tension to excessive tension, the degree of freedom can be ensured for the bonding direction and the tension control, and the front and back sides of the optical unit can be easily realized. The balance of the stresses (the first surface and the second surface) of the first surface and the second surface is substantially uniform and substantially uniform, and the warpage of the optical display panel can be suppressed.
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.
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 an embodiment of the invention, the absorption axis of the first optical film bonded to one surface of the optical display panel and the absorption axis of the second optical film bonded to the other surface are orthogonal to each other, and are wound around the first optical The absorption axis of the first optical film in the state of the film roll is located in the longitudinal direction, and The absorption axis of the strip-shaped second optical film for producing the second optical film in the single-sheet state is located in the longitudinal direction.
According to an embodiment of the invention, the optical unit is a liquid crystal cell of a VA mode or an IPS mode.
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
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;
The continuous manufacturing system of the optical display panel of the present embodiment is a system for continuously manufacturing an optical display panel having a first optical film on one area layer of the optical unit and a second optical layer on the other area layer of the optical unit. a film, and the continuous manufacturing system includes: a series of conveyance units that convey the optical unit and the optical display panel; and a first optical film supply unit that supplies the first optical film in a strip shape from the first optical film roll The first optical film obtained by cutting the film in the widthwise direction and transporting the optical film conveyed by the transfer unit, the first optical film supplied from the first optical film supply unit from the optical One of the opposite sides of the unit is bonded to one surface of the optical unit along the supply direction of the first optical film, and the second optical film supply unit is provided with a second optical film containing unit in a single piece. Taking out and supplying the second optical film; and the second bonding portion, while transporting the optical unit carried by the transport unit, The second optical film supplied from the second optical film supply unit is bonded to the other surface of the optical unit along the supply direction of the second optical film from one side of the pair of optical units.
<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, those shown in Fig. 1, Fig. 2, and Fig. 3 were used. 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 strip-shaped first polarizing film 11 (corresponding to the first optical film) having an 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 is temporarily adhered thereto. The release film 214 is a protective agent of the adhesive 213.
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 peels off the first laminated optical film 10 from the first carrier film 12 by folding back the first laminated optical film 10 inside 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 unit 81 supplies 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 is supplied by the first optical film supply unit 101 (by the first peeling) The first polarizing film 111 of the portion of the liquid crystal cell P is bonded to the liquid crystal cell via the adhesive 11b from the short side of the liquid crystal cell P along the supply direction of the first polarizing film 111 (longitudinal direction of the liquid crystal cell P). The face Pa of the face of the face of P. 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 is a second optical film in a single piece. 21 is moved from the accommodating portion 102c to the bonding position; the peeling portion (not shown) is detached from the second optical film 21 in the single-piece state, and the release film 214 is peeled off in a single state; and the adsorption portion 82b is adsorbed in a single state. The second optical film 21; the bonding roller 82a; and the driving roller 82c are in surface contact with the liquid crystal cell P and transport the liquid crystal cell P.
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 moves 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, and the adhesive tape can be adhered to the surface of the release film 214, and the adhesive tape can be moved, and the release film 214 can be peeled off.
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. 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, warpage of the liquid crystal display panel 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. First bonding part, second sticker The order of the joints can also 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 surface is formed. The optical film 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 along the supply direction of the second optical film. However, the optical film 21 is absorbed by the polarizing film of the liquid crystal cell on the viewing side and the back side. The method of bonding in a cross-nicol manner is not limited thereto. The first polarizing film 111 may be bonded to the long side of the liquid crystal cell P, and the second optical film 21 may be 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. Further, the absorption axes of the respective polarizing films on the viewing side and the back side of the liquid crystal cell are bonded to each other in a cross-nicol manner.
(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 optical film on one area layer of the optical unit and a second optical layer on the other area layer of the optical unit The film, and the continuous production method includes a first bonding step of supplying the first optical film obtained by cutting a strip-shaped first optical film in a width direction from a first optical film roll. While the optical unit is being transported, the first optical film is bonded to one side of the optical unit from the pair of side faces of the optical unit along the supply direction of the first optical film; and the second bonding a step of taking out the second optical film from the accommodating portion of the second optical film in a single state and supplying the optical film, and moving the optical unit from the side of the pair of the optical unit The second optical film is bonded to the other surface of the optical unit in the supply direction of the second optical film.
Further, the absorption axis of the first optical film bonded to one surface of the optical display panel and the absorption axis of the second optical film bonded to the other surface are orthogonal to each other and are wound around the first optical film roll. The absorption axis of the first optical film is located in the longitudinal direction, and the absorption axis of the strip-shaped second optical film for producing the second optical film in the monolithic state is located in the longitudinal direction.
(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. The second optical film is exemplified by a wide-band retardation film, a laminated optical film in which a broadband retardation film and a polarizing film are laminated, and the like. 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. The optical film of the size corresponding to the optical unit (the optical film attached to the optical unit) is also wound to a smaller size than the optical unit (more preferably The small size can be formed by forming a strip-shaped laminated optical film including a defective portion (an optical film roll with a slit), whereby the yield can be improved as well. 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.
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 be, for example, any of a top emission method, a bottom emission method, and a double-emission method. 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 (6)

  1. A method for continuously manufacturing an optical display panel, which is a method for continuously producing an optical display panel having a first optical film on one area layer of an optical unit and a second optical layer on another area layer of the optical unit The film, and the continuous production method includes a first bonding step of supplying the first optical film obtained by cutting a strip-shaped first optical film in a width direction from a first optical film roll. While the optical unit is being transported, the first optical film is bonded to one side of the optical unit from the pair of side faces of the optical unit along the supply direction of the first optical film; and the second bonding a step of taking out the second optical film from the accommodating portion of the second optical film in a single state and supplying the optical film, and moving the optical unit from the side of the pair of the optical unit The second optical film is bonded to the other surface of the optical unit in the supply direction of the second optical film.
  2. The continuous manufacturing method of the optical display panel of claim 1, wherein the absorption axis of the first optical film bonded to one surface of the optical display panel and the absorption axis of the second optical film bonded to the other surface are orthogonal to each other The absorption axis of the first optical film in the state of the first optical film roll is located in the longitudinal direction, and the absorption axis of the second optical film for producing the second optical film in the single-piece state is long. Side direction.
  3. A continuous manufacturing method of an optical display panel according to claim 1 or 2, wherein the optical unit is a liquid crystal cell of a VA mode or an IPS mode.
  4. A continuous manufacturing system for an optical display panel, which is a system for continuously manufacturing an optical display panel having a first optical on an area layer of an optical unit a film having a second optical film in another area layer of the optical unit, wherein the continuous manufacturing system includes: a series of conveying units for conveying the optical unit and the optical display panel; and a first optical film supply unit; The first optical film roll is supplied with the first optical film obtained by cutting the strip-shaped first optical film in the width direction, and the first bonding unit conveys the optical unit carried by the transfer unit. And attaching the first optical film supplied from the first optical film supply unit to one side of the optical unit from the side opposite to the optical unit from the side of the first optical film; The optical film supply unit that takes out the second optical film from the accommodating portion of the second optical film in a single state and supplies the second optical film, and the second bonding unit that conveys the optical unit that is transported by the transport unit The second optical film supplied from the second optical film supply unit is bonded to the other surface of the optical unit along the supply direction of the second optical film from the side opposite to the optical unit.
  5. The continuous manufacturing system of the optical display panel of claim 4, wherein the absorption axis of the first optical film bonded to one surface of the optical display panel and the absorption axis of the second optical film bonded to the other surface are orthogonal to each other The absorption axis of the first optical film in the state of the first optical film roll is located in the longitudinal direction, and the absorption axis of the second optical film for producing the second optical film in the single-piece state is long. Side direction.
  6. A continuous manufacturing system of an optical display panel according to claim 4 or 5, wherein the optical unit is a liquid crystal unit of a VA mode or an IPS mode.
TW102140736A 2012-11-09 2013-11-08 A continuous manufacturing method of an optical display panel and a continuous manufacturing system for an optical display panel TWI524985B (en)

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