JP5711833B2 - Display panel device having touch input function, optical unit for the display panel device, and manufacturing method thereof - Google Patents

Description

  The present invention relates to a display panel device having a touch input function, an optical unit including a touch input function unit for constituting the display panel device, and a manufacturing method thereof. In particular, the present invention relates to a display panel device and an optical unit having a capacitive touch input function, and a manufacturing method thereof.

  Display panels having a touch panel for touch input are disclosed in many documents. For example, in Japanese Patent Application Laid-Open No. 2002-40243 (Patent Document 1), Japanese Patent Application Laid-Open No. 2002-55780 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2002-156920 (Patent Document 3), the touch panel is touched above the display panel plate. A display panel device in which a touch panel for input is arranged is disclosed. The touch panels described in these patent documents are both of the resistive film type, and two transparent electrodes are arranged to face each other with a gap between them, and one transparent electrode arranged on the viewing side of the display panel device is pushed to the other. By touching the transparent electrode, touch input is sensed. In these patent documents, since there is an air gap between two electrodes, there is a problem that the reflected light on the electrode surface is transmitted to the viewing side of the display panel device to deteriorate the display quality. In the above-mentioned patent document, in order to cope with this problem of internal reflection, it is taught that a circularly polarizing element is arranged on the viewer side from the touch panel. Specifically, in these patent documents, it is proposed that a linearly polarizing layer and a 1 / 4λ phase difference layer are arranged in this order from the viewing side of the display panel, and a touch panel is arranged thereunder. Patent Document 1 shows a configuration in which a touch panel is combined with a reflective liquid crystal display device, and Patent Document 2 shows that it can be applied to both a liquid crystal display device and an organic EL display device. Patent Document 3 shows an example of an organic EL display device.

  Japanese Patent Laying-Open No. 2010-198103 (Patent Document 4) discloses a capacitive touch input device. The touch sensor described in Patent Document 4 has a conductor layer patterned on both sides of a base film configured as a single body. A touch sensor having a similar laminated structure is also described in FIG. 5 of Japanese Patent Application Laid-Open No. 2009-76432 (Patent Document 5). Furthermore, in Patent Document 5, a transparent electrode layer is formed on one surface of a film substrate via an undercoat layer, and the other surface of the film substrate is bonded to a second film substrate via an adhesive layer. And the double-sided electrode type touch sensor which formed the 2nd transparent electrode layer in the 2nd film base material via the 2nd undercoat layer is described in FIG. Moreover, the pattern formation of the transparent electrode used for a touch sensor is described in detail in International Publication WO2006 / 126604.

JP 2002-40243 A JP 2002-55780 A JP 2002-156920 A JP 2010-198103 A JP 2009-76432 A WO2006 / 126604

Although not described in any of the above-mentioned patent documents, in the conventional display device, border printing with a predetermined width is performed on the back surface of the display window along the edge. And the member located in the lower layer of a window is joined to this window by the adhesive bond layer along the back side of this border printing. Since the conventional display device has such a configuration, an air gap exists between the window and the lower layer member, and internal reflection occurs due to the air gap. As described, even when the circularly polarizing element is arranged close to the viewing side, the internally reflected light passes through the window and deteriorates the display quality.
Moreover, in the structure shown in patent document 4, since one conductor layer of a touch panel sensor exists in the position close | similar to the protective cover which is a window, the internal reflection in this conductor layer appears in a display part, and display quality falls. Let In Patent Document 5, there is no teaching or suggestion as to how to deal with the problem of internal reflection.
It is a first object of the present invention to prevent display quality from being degraded by internal reflection of light as much as possible in a display panel device having a capacitive touch input function.
Furthermore, the configuration of the touch panel described in FIG. 5 of Patent Document 4 and Patent Document 5 is not easy to manufacture, and the configuration described in FIG. 7 of Patent Document 5 does not solve the difficulty in manufacturing.
Therefore, another object of the present invention is to make a configuration for capacitive touch input easy and practical.
Still another object of the present invention is to easily transfer a unit having a laminate for a touch input function to the next process for combination with a display panel board, and more easily than a conventional device. A thin layer structure is used.

  In order to solve the above problems, the present invention, in one form thereof, provides an optical unit comprising a combination of a touch panel laminate and a polarization functional laminate for a display panel device having a capacitive touch input function. To do. The touch panel laminate in this optical unit includes an optically transparent first base material layer laminated on one surface of an optically transparent adhesive layer, and a first side opposite to the adhesive layer. A first transparent conductive layer laminated on the surface of the base material layer via a first undercoat layer, and an optically transparent second base material layer laminated on the other surface of the adhesive layer And a second transparent conductive layer laminated via a second undercoat layer on the surface of the second base material layer opposite to the adhesive layer. These first and second transparent conductive layers are patterned in a predetermined pattern. The polarizing functional laminate includes a layer including at least a circularly polarizing element, and an optically transparent adhesive layer is provided on the surface having one of the first and second transparent conductive layers of the touch panel laminate. Are stacked. Furthermore, a release liner is detachably bonded to the surface having the other of the first and second transparent conductive layers through the optically transparent adhesive layer in the touch panel laminate. The adhesive layer that joins the release liner to the touch panel laminate is attached to the release liner with a weak adhesive force so as to remain in the form of a layer on the touch panel laminate side when the release liner is peeled off.

  In the configuration according to this aspect of the present invention, the first and second undercoat layers are disposed on both sides of the dielectric layer composed of the first and second base material layers and the adhesive layer disposed therebetween, The first and second transparent conductive layers are respectively formed to constitute an integral touch input sensor unit. A polarizing functional laminate is laminated on one surface of the integrated touch input sensor unit via an optically transparent adhesive layer. That is, the polarizing functional laminate is bonded to the touch input sensor unit by the adhesive layer over the entire surface. Furthermore, since the release liner is bonded to the other surface of the touch input sensor unit via an adhesive layer, the optical unit further includes a base film and a hard coat layer on the outside as in the conventional touch input sensor. Without providing, it can have sufficient rigidity to transfer to the next process. Therefore, it is possible to reduce the number of layers as a whole in a state where the display panel device is assembled, and the device can be thinned.

  In the case of providing a transparent conductive layer on both sides of the base film, an apparatus different from the conventional apparatus is required to form a conductor layer on both sides. For example, when the conductive layer is formed by sputtering, a special apparatus for performing sputtering on both sides is required. However, in the optical unit according to this aspect of the present invention, the first transparent conductive layer is formed on the first base material layer, and the second transparent conductive layer is formed on the second base material layer. Since the first and second base material layers can be bonded by the adhesive layer, it is possible to form a conductive layer by a conventional process using a conventional sputtering apparatus.

  The touch input sensor unit configured as described above in the optical unit of the present invention further brings a manufacturing advantage. More specifically, when the first and second conductive layers are formed on the first and second substrate layers via the first and second undercoat layers, respectively, these substrate layers are used. Are available only in thicknesses standardized by the raw material supplier. Also, in the process of forming a conductive layer on the base film constituting the base layer via an undercoat layer, the thinner the base film, the higher the production efficiency and the stable quality product is obtained. It is done. Therefore, in the optical unit according to the above aspect of the present invention, a thin film is selected as a base film from a standard thickness material film available from a raw material supplier, and the dielectric constant required for the touch input sensor is determined by the material of the adhesive layer. And it becomes possible to adjust by a flexible method by selecting thickness and thickness suitably.

  The touch input sensor unit which constitutes a part of the optical unit according to the above aspect of the present invention can be formed by, for example, the following method. That is, first, an adhesive sheet in which a release film is releasably bonded to both sides of an adhesive formed in a layer form is prepared, and a first undercoat layer is laminated on one side of the first substrate. The first transparent conductive layer is deposited on the first undercoat layer, the second undercoat layer is laminated on one surface of the second substrate, and the second undercoat layer is formed. A second transparent conductive layer is adhered and formed on the adhesive layer, and the adhesive layer exposed by peeling off the release film is peeled off from the surface of one side of the adhesive layer. The adhesive layer exposed by peeling off the release film while sequentially bonding to the other surface of the substrate of 1 and peeling off the release film from the surface on the other side of the adhesive layer, Adopting a method comprising the step of sequentially joining to the other surface of the substrate Door can be. Alternatively, the adhesive formed in a layer form can be peeled to one side of the release film by applying the adhesive solution to one side of the one release film while continuously feeding one of the release films. A bonded adhesive sheet was formed, a first undercoat layer was laminated on one surface of the first base material, and a first transparent conductive layer was deposited on the first undercoat layer. The first laminate is continuously bonded to the adhesive layer of the adhesive sheet that is continuously fed, and a second undercoat layer is laminated on one surface of the second substrate, Adhesive exposed by peeling off the release film while peeling off the release film from the adhesive layer on the second laminate in which the second transparent conductive layer is formed on the second undercoat layer. Comprising the step of sequentially bonding to a layer of It can also be due.

  As the adhesive forming the adhesive layer, for example, an adhesive such as an acrylic adhesive, a silicone adhesive, a polyester adhesive, a rubber adhesive, and a polyurethane adhesive can be used. An adhesive agent can be used individually or in combination of 2 or more types. Among them, an acrylic polymer having a main monomer component of (meth) acrylic acid alkyl ester [(meth) acrylic acid C1-18 alkyl ester] having 1 to 18 carbon atoms in the alkyl group is contained as a main component or base polymer. Preferred is an acrylic adhesive. Examples of the (meth) acrylic acid C1-18 alkyl ester include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, Isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, (meth) acryl (Meth) acrylates such as octyl acid, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate ) C1-18 alkyl ester of acrylic acid. These (meth) acrylic acid C1-18 alkyl esters can be used alone or in admixture of two or more.

  In the acrylic polymer, a monomer component (copolymerizable monomer) having a copolymerizability with the (meth) acrylic acid C1-18 alkyl ester may be used. In particular, when the acrylic polymer is cross-linked, it is preferable that a monomer for modifying the acrylic pressure-sensitive adhesive is used as the copolymerizable monomer. As such a modifying monomer, for example, any of various monomers known as modifying monomers for acrylic pressure-sensitive adhesives can be used. A copolymerizable monomer can be used individually or in combination of 2 or more types. Specifically, examples of the copolymerizable monomer include vinyl esters such as vinyl acetate; cyano group-containing copolymerizable monomers such as (meth) acrylonitrile; (meth) acrylamide, N, N-dimethyl (meth) acrylamide. Amide group-containing copolymerizable monomers such as 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, etc. Copolymerizable monomer; epoxy group-containing copolymerizable monomer such as glycidyl (meth) acrylate; amino group-containing copolymerizable monomer such as N, N-dimethylaminoethyl (meth) acrylic acid alkyl ester; (meth) acrylic acid; Crotonic acid, itaconic acid, maleic acid, maleic anhydride Copolymerizable monomers (functional group-containing copolymerizable monomers) having various functional groups (particularly polar groups) such as carboxyl group-containing copolymerizable monomers such as inacid and fumaric acid, and styrene such as styrene Α-olefin monomers such as ethylene and propylene. As the modifying monomer, the functional group-containing copolymerizable monomer can be used, and among these, a hydroxyl group-containing copolymerizable monomer and a carboxyl group-containing copolymerizable monomer are preferable, and acrylic acid is particularly preferable. . The acrylic polymer can be crosslinked using a functional group (particularly a polar group) derived from the modifying monomer. Polymerization methods for obtaining acrylic polymers include solution polymerization methods using emulsion initiators such as azo compounds and peroxides, emulsion polymerization methods and bulk polymerization methods, and light and radiation using photoinitiators. A polymerization method performed by irradiation may be employed.

  Especially as a crosslinking agent, a polyfunctional melamine compound, a polyfunctional epoxy compound, and a polyfunctional isocyanate compound are preferable. A crosslinking agent can be used individually or in mixture of 2 or more types. Examples of the polyfunctional melamine compound include methylated trimethylol melamine and butylated hexamethylol melamine. Moreover, as a polyfunctional epoxy compound, diglycidyl aniline, glycerol diglycidyl ether, etc. are mentioned, for example. The amount of the polyfunctional melamine compound and / or polyfunctional epoxy compound used is, for example, in the range of 0.001 to 10 parts by weight, preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the polymer. . Examples of the polyfunctional isocyanate compound include tolylene diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate duplex, reaction product of trimethylolpropane and tolylene diisocyanate, and trimethylol. A reaction product of propane and hexamethylene diisocyanate, polyether polyisocyanate, polyester polyisocyanate and the like can be mentioned. The usage-amount of a polyfunctional isocyanate compound is 0.01-20 weight part with respect to 100 weight part of said polymers, Preferably it is the range of 0.05-15 weight part.

As the release liner, a release liner obtained by subjecting the surface of a plastic film (particularly PET film) having a smooth surface to a release treatment can be suitably used. The release force of the release liner is preferably 0.05 to 1.00 N / 50 mm.
<Measurement of peel strength of release liner>
The peelable force of the release liner was measured when the optical member with a release liner cut to a size of 50 mm in width and 100 mm in length was peeled off at a tensile speed of 300 mm / min (peeling angle 180 °) with a universal tensile testing machine. . The measurement was performed in an environment of 23 ° C. × 50% RH.

The adhesive layer preferably has high transparency. For example, the total light transmittance (according to JIS K 7136) in the visible light wavelength region is 85% or more (preferably 87% or more, more preferably 90). % Or more) is desirable.
The haze of the double-sided pressure-sensitive adhesive sheet 1 (according to JIS K 7136) can be selected from a range of 2.0% or less (preferably 1.0% or less, more preferably 0.5% or less), for example. it can.

  The first and second base material layers are preferably formed of a polyethylene terephthalate (PET) film. However, other materials can be used. The undercoat layer is intended to prevent internal reflection, and usable materials and antireflection functions are described in detail in Patent Document 5. Also in this invention, the material described in patent document 5 can be used for an undercoat layer.

The polarizing functional laminate includes at least a circularly polarizing element. More specifically, the polarizing functional layered product has a configuration in which a polarizer layer that generates linearly polarized light and a ¼λ phase difference element are stacked in this order as viewed from the viewing side of the display device in which the optical unit is incorporated. If a 1 / 2λ phase difference element is further added to the 1 / 4λ phase difference element, circularly polarized light with high fidelity can be obtained. The configuration and action of the circularly polarizing element are described in detail in Patent Document 3.
When the optical unit of the present invention is incorporated in a display panel device, in one aspect, the release liner is peeled off. At this time, the release liner is peeled off leaving the transparent adhesive layer in the form of a layer on the touch panel laminate side. Next, the window is bonded to the touch panel laminate by the adhesive layer left in the layer shape. The window is subjected to border printing along the edge, and a step due to the border printing is filled with an adhesive layer. Therefore, no air gap remains on the window side, and internal reflection at this position is suppressed. In this aspect, the display panel board is bonded to the polarization functional laminate. The display panel board can be a liquid crystal display panel board or an organic EL element board.
In another aspect, a display panel board is joined to the adhesive bond layer left on the touch panel laminate side by peeling off the release liner. In this case, the polarizing functional laminate side becomes the viewing side. A window can be bonded to the outer surface of the polarizing functional laminate through an optically transparent adhesive layer, though it is optional.

  In another embodiment of the present invention, the optical unit is formed in a long shape and is used for manufacturing a display panel device in a state of being wound in a roll shape. Therefore, this invention provides the manufacturing method of the display panel apparatus which manufactures a display panel using the roll of an above-described optical unit. According to this method, in one aspect, the display panel plate including the optical display element is sequentially fed to the bonding position, the optical unit is fed from the roll, and the optical unit corresponds to the feed direction length of the display panel plate. The sheet of the optical unit is formed by cutting the length in the feed direction, and the sheet of the optical unit is fed so that the polarizing functional laminate in the sheet of the optical unit overlaps the display panel plate at the bonding position. The method includes a step of bonding the sheet to the display panel plate via an optically transparent adhesive.

  In another method, the display panel plate including the optical display element is sequentially fed to the bonding position, the optical unit is unwound from the roll, and the portion of the optical unit excluding the release liner is fed to the display panel plate. The optical unit sheet is formed by cutting into a length in the feed direction corresponding to the direction length, and the optical unit sheet is peeled off from the release liner of the optical unit at the bonding position, and the polarization functional layering on the optical unit sheet is performed. The sheet of the optical unit is fed so that the surface opposite to the body overlaps the display panel plate, and the sheet of the optical unit is displayed on the display panel plate by the optically transparent layered adhesive to which the release liner is bonded. It consists of a stage to paste.

  When the method using the long optical unit according to this aspect of the present invention is used, the optical unit can be continuously attached directly to the display panel plate from the roll, and the manufacturing process becomes efficient.

  According to still another aspect of the present invention, in an optical unit comprising a combination of a touch panel laminate and a polarization functional laminate for a display panel device having a capacitive touch input function, the touch panel laminate is An optically transparent first base material layer laminated on one surface of the optically transparent adhesive layer, and a first surface on the surface of the first base material layer opposite to the adhesive layer A first transparent conductive layer laminated via an undercoat layer, an optically transparent second base material layer laminated on the other surface of the adhesive layer, and the adhesive layer A second transparent conductive layer laminated on the surface of the second base material layer on the opposite side via a second undercoat layer. The first and second transparent conductive layers are patterned in a predetermined pattern. The polarizing functional laminate includes a layer including at least a circularly polarizing element, and an optically transparent adhesive layer is provided on the surface having one of the first and second transparent conductive layers of the touch panel laminate. Are stacked. In the touch panel laminate, a transparent window is bonded to the surface having the other of the first and second transparent conductive layers via an optically transparent adhesive layer.

  Furthermore, in an optical unit comprising a combination of a touch panel laminate and a polarization functional laminate for a display panel device having a capacitive touch input function according to another embodiment of the present invention, the touch panel laminate is optical. An optically transparent first base material layer laminated on one side of the transparent adhesive layer, and a first underlayer on the surface of the first base material layer opposite to the adhesive layer A first transparent conductive layer laminated via a coating layer; an optically transparent second base material layer laminated on the other surface of the adhesive layer; and the side opposite to the adhesive layer And a second transparent conductive layer laminated on the surface of the second base material layer via a second undercoat layer. The first and second transparent conductive layers are patterned in a predetermined pattern. The polarizing functional laminate includes a layer including at least a circularly polarizing element, and an optically transparent adhesive layer is provided on the surface having one of the first and second transparent conductive layers of the touch panel laminate. Are stacked.

  According to still another aspect of the present invention, in an optical unit composed of a combination of a touch panel laminate and a polarization functional laminate for a display panel device having a capacitive touch input function, the touch panel laminate comprises: An optically transparent first base material layer laminated on one surface of the optically transparent adhesive layer, and a first base material surface opposite to the adhesive layer on the first surface A first transparent conductive layer laminated via an undercoat layer, an optically transparent second base material layer laminated on the other surface of the adhesive layer, and the adhesive layer opposite A second transparent conductive layer laminated on the surface of the second base layer on the side through a second undercoat layer, and the first and second transparent conductive layers have a predetermined pattern A pattern is formed. The polarization functional laminate includes a layer including at least a circularly polarizing element, and is laminated via an optically transparent adhesive layer on the surface having one of the first and second transparent conductive layers of the touch panel laminate. Is done. A first release liner is releasably bonded to the touch panel laminate through the optically transparent adhesive layer on the surface having the other of the first and second transparent conductive layers. Furthermore, a second release liner is releasably bonded to the polarization functional laminate on the surface opposite to the touch panel laminate via an optically transparent adhesive layer. The adhesive layer that joins the liner is attached to the first and second release liners with a weak adhesive force so as to remain in layers on the polarizing functional laminate side and the touch panel laminate side when the release liner is peeled off. .

  In the optical unit of the present invention comprising a combination of a touch panel laminate and a polarization functional laminate for a display panel device having a capacitive touch input function according to another embodiment, the touch panel laminate is optical. An optically transparent first base material layer laminated on one side of the transparent adhesive layer, and a first underlayer on the surface of the first base material layer opposite to the adhesive layer A first transparent conductive layer laminated via a coating layer; an optically transparent second base material layer laminated on the other surface of the adhesive layer; and the side opposite to the adhesive layer A second transparent conductive layer laminated on the surface of the second base material layer via a second undercoat layer, and the first and second transparent conductive layers are formed in a predetermined pattern. A pattern is formed. The polarization functional laminate includes a layer including at least a circularly polarizing element, and is laminated via an optically transparent adhesive layer on a surface having one of the first and second transparent conductive layers of the touch panel laminate. Is done. In the touch panel laminate, a hard coat film is bonded to the surface having the other of the first and second transparent conductive layers through an optically transparent adhesive layer. The release liner is releasably bonded to the polarizing functional laminate through an optically transparent adhesive layer, and the adhesive layer that bonds the release liner to the polarizing functional laminate peels the release liner. Then, it adheres to the release liner with a weak adhesive force so as to remain in a layered state on the polarizing functional laminate side.

  Furthermore, as another embodiment of the present invention, the touch panel laminate includes an optically transparent first base material layer laminated on one surface of an optically transparent adhesive layer, and the adhesive layer. A first transparent conductive layer laminated on the surface of the first base material layer on the opposite side via a first undercoat layer, and an optically transparent layer laminated on the other surface of the adhesive layer A second substrate layer, and a second transparent conductive layer laminated on the surface of the second substrate layer opposite to the adhesive layer via a second undercoat layer, The first and second transparent conductive layers are patterned in a predetermined pattern, the polarization functional laminate includes a layer including at least a circularly polarizing element, and the first and second of the touch panel laminate. In an optical unit laminated with an optically transparent adhesive layer on a surface having one of the transparent conductive layers of In the active laminate, a transparent window is bonded to the surface having the other of the first and second transparent conductive layers through an optically transparent adhesive layer, and the polarizing functional laminate is provided in the touch panel laminate. A hard coat film can be bonded to the opposite surface via an optically transparent adhesive layer.

  The present invention further provides a display panel device including an optical unit composed of a combination of a touch panel laminate and a polarization functional laminate for capacitive touch input. In this display panel device, the touch panel laminate of the optical unit is opposite to the optically transparent first base material layer laminated on one surface of the optically transparent adhesive layer and the adhesive layer. A first transparent conductive layer laminated on the surface of the first substrate layer on the side through a first undercoat layer, and an optically transparent first layer laminated on the other surface of the adhesive layer. 2 base material layers, and a second transparent conductive layer laminated via a second undercoat layer on the surface of the second base material layer opposite to the adhesive layer, The first and second transparent conductive layers are patterned in a predetermined pattern, the polarization functional laminate includes a layer including at least a circularly polarizing element, and the first and second of the touch panel laminate. It is laminated on the surface having one of the transparent conductive layers via an optically transparent adhesive layer. In addition, a transparent window is bonded to the touch panel laminate through the optically transparent adhesive layer on the surface having the other of the first and second transparent conductive layers. The display panel board is joined to the surface opposite to the touch panel laminate via an optically transparent adhesive layer.

  As described above, according to the configuration of the present invention, in a display panel device having a capacitive touch input function, it is possible to prevent display quality from being degraded due to internal reflection of light as much as possible. Furthermore, according to the present invention, it is possible to obtain a configuration for capacitive touch input that is easy to manufacture and practical. In addition, it is easy to transfer a unit having a laminate for a touch input function to the next process for combination with a display panel board, and the layer configuration is simpler and thinner than conventional devices. can do.

It is a schematic sectional drawing which shows the optical unit by one Embodiment of this invention in relation to a window and a display panel board. It is a schematic sectional drawing similar to FIG. 1 which shows the optical unit by other embodiment of this invention. It is sectional drawing similar to FIG. 1 which shows other embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows other embodiment of this invention. It is process drawing which shows the process of manufacturing the sheet | seat containing an optically transparent adhesive bond layer. The coating and bonding apparatus for the process shown in FIG. 5 is shown, (a) is the schematic of the whole apparatus, (b) is a schematic sectional drawing of the adhesive laminated body after bonding. The process for manufacturing a polarizer laminated body is shown, (a) is the schematic of the whole apparatus, (b) is a schematic sectional drawing of the polarizer laminated body obtained. The manufacturing process of a polarizing function laminated body is shown, (a) is a block diagram of the whole process, (b) is a schematic sectional drawing which shows the laminated body obtained. The process which forms an undercoat layer in the base material used as the constituent material of a touch-panel laminated body is shown, (a) is a schematic block diagram of the process, (b) shows the base material by which the undercoat layer was coated. It is sectional drawing. The process which forms a conductive layer in the base material which has an undercoat layer is shown, (a) is a block diagram of a process, (b) is sectional drawing of the electroconductive laminated body obtained, (c) is electroconductive lamination It is sectional drawing of the electroconductive laminated body with an adhesive layer obtained by laminating | stacking an adhesive bond layer on a body. (A) is the schematic of the process of forming an electroconductive laminated body, (b) is the schematic which shows the process of laminating | stacking the electroconductive laminated body with an adhesive layer on an electroconductive laminated body, (c) is the touchscreen lamination | stacking obtained It is sectional drawing which shows the example of a body. The process which forms an optical unit is shown, (a) is the schematic of the process of attaching an adhesive bond layer to a touch-panel laminated body, (b) is the schematic of the process of bonding a polarizing function laminated body. The process of joining a display panel board to an optical unit is shown, (a) is a perspective view for demonstrating an outline | summary, (b) is sectional drawing. It is a perspective view which shows roughly the continuous process which joins an optical unit to a display panel board.

  Referring to FIG. 1, an optical unit 1 according to an embodiment of the present invention includes a touch panel laminate 3 and a polarization functional laminate 5. The touch panel laminate 3 is optically transparent bonded to both sides of an optically transparent adhesive layer 31 via optically transparent first and second oligomer prevention layers 32 and 33, respectively. First and second base material layers 34 and 35 are provided. An optically transparent undercoat layer 36 is bonded to the surface of the first base layer 34 opposite to the oligomer prevention layer 32, and the optically transparent first first layer is bonded to the undercoat layer 36. The conductive layer 37 is formed by sputtering, for example. Similarly, an optically transparent undercoat layer 38 is bonded to the surface of the second base layer 35 opposite to the oligomer prevention layer 33, and the optically transparent layer is formed on the undercoat layer 38. A second conductive layer 39 is deposited by sputtering, for example. This touch panel laminate 3 constitutes a touch input sensor unit. As is well known in the art, the first and second conductive layers 37, 38 are patterned into a desired pattern.

  On one surface of the touch panel laminate 3 constituting the touch input sensor unit, that is, the surface having the second conductive layer 39, the above-described polarization functional laminate 5 is provided via an optically transparent adhesive layer 7. Be joined. The polarizing functional laminate 5 is composed of a polarizer film 51 located on the side facing the adhesive layer 7 and a quarter-wave retardation film 52 bonded to the polarizer film 51, and a circularly polarizing element. Form. In addition to the 1 / 4λ retardation film 52, a 1 / 2λ retardation film (not shown) may be provided as taught in Patent Document 3.

  The release liner 11 is bonded to the other surface of the touch panel laminate 3, that is, the surface having the first conductive layer 37 through the optically transparent adhesive layer 9. The adhesive force of the release liner 11 to the adhesive layer 9 is such that when the release liner 11 is peeled off, the pattern of the first conductive layer 37 and the pattern of the first conductive layer 37 in which the adhesive layer 9 is patterned. It is assumed that the layer remains on the first undercoat layer 36 exposed from between.

  In the layer arrangement of the optical unit 1 shown in FIG. 1, the display panel board 13 is bonded to the polarization functional laminate 5 through an optically transparent adhesive layer (not shown). In the illustrated example, the display panel plate 13 includes an organic EL element, but may be a liquid crystal display panel plate.

  Further, the release liner 11 is peeled off, and the transparent window 15 is joined to the touch panel laminate 3 by the adhesive layer 9. That is, the window 15 is bonded to the touch panel laminate 3 by the adhesive layer 9 over the entire surface. As shown in FIG. 1, the window 15 is provided with a border print 17 along the edge of the inner surface thereof, and the border print 17 forms a stepped portion as can be seen from the drawing. However, according to the configuration of FIG. 1, since the entire surface of the window 15 is bonded to the touch panel laminate 3 via the adhesive layer 9, the stepped portion due to the border printing 17 is filled with the adhesive of the adhesive layer 9. become. Therefore, according to the embodiment shown in FIG. 1, an air gap is not generated between the window 15 and the touch panel laminate 3, and internal reflection due to the air gap can be suppressed.

  FIG. 2 shows another embodiment of the present invention. In this embodiment, constituent elements corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted. The configuration of FIG. 2 is a configuration obtained by inverting the configuration of FIG. 1 upside down. Be joined. Therefore, the polarizing functional laminate 5 side is the viewing side. In this optical unit 1, the polarizer film 51 of the polarization functional laminate 5 is bonded to the window 15 through an optically transparent adhesive layer (not shown). A display panel plate 13 is bonded to the adhesive layer 9 exposed by peeling off the release liner 11.

  FIG. 3 is a sectional view similar to FIG. 1 showing a modified embodiment of the optical unit 1 according to the present invention shown in FIG. In the embodiment shown in FIG. 3, an optically transparent release liner 23 is bonded to the outer surface of the polarizing functional laminate 5 via an optically transparent adhesive layer 21. Also in the configuration of the optical unit 1, the adhesive force of the release liner 23 to the adhesive layer 21 is such that the adhesive layer 21 remains layered on the polarizing functional laminate 5 when the release liner 23 is peeled off. And The pasting of the window 15 is the same as in the embodiment shown in FIG. In the embodiment of FIG. 3, the display panel is peeled off the release liner 23 and bonded to the polarizing functional laminate 5 by the adhesive layer 21.

  FIG. 4 is a cross-sectional view similar to FIG. 2 showing a modification corresponding to the embodiment shown in FIG. In this embodiment, a release liner 23 is bonded to the polarizer film 51 of the polarizing functional laminate 5 via an optically transparent adhesive layer 21. The adhesive force of the release liner 23 to the adhesive layer 21 is the same as in the embodiment shown in FIG. A hard coat layer 27 is bonded to the surface of the touch panel laminate 3 opposite to the polarizing functional laminate 5 via an optically transparent adhesive layer 25. The window 15 is bonded to the optical unit 1 by the adhesive layer 21 exposed by peeling off the release liner 23. The hard coat layer 27 is bonded to the display panel board 13 through an optically transparent adhesive layer (not shown).

  Below, an Example is described in detail about each layer used for manufacture of the optical unit of the present invention.

(Formation of optically transparent adhesive layer)
FIG. 5 is a process diagram showing an example of a method for forming an optically transparent adhesive layer used in the present invention. First, a monomer as a basic constituent material of an adhesive and a polymerization initiator were mixed and stirred together with a solvent. As the monomer component, a mixture composed of 70 parts by weight of 2-methoxyethyl acrylate, 29 parts by weight of 2-ethylhexyl acrylate, and 1 part by weight of 4-hydroxybutyl acrylate was used. As a polymerization initiator, 0.2 part by weight of 2,2′-azobisisobutyronitrile was used, and as a polymerization solvent, 100 parts by weight of ethyl acetate was used. These materials were put into a separable flask and stirred for 1 hour while introducing nitrogen gas (S5-1). After removing oxygen in the polymerization system in this way, the temperature was raised to 63 ° C. and reacted for 10 hours (S5-2), and toluene was added to obtain an acrylic polymer solution with a solid content concentration of 25% by weight. (S5-3). This acrylic polymer solution may be referred to as “acrylic polymer solution A”. Moreover, the acrylic polymer contained in this acrylic polymer solution A may be called the acrylic polymer A, and the weight average molecular weight Mw was 1.5 million. The weight average molecular weight Mw can be measured by a gel permeation chromatograph (GPC) method. Specifically, the product name “HLC-8120GPC” manufactured by Tosoh Corporation can be used as the GPC measurement device, and the weight average molecular weight Mw can be determined by measurement under the following GPC measurement conditions using polystyrene conversion values.
GPC measurement conditions Sample concentration: 0.2% by weight (tetrahydrofuran solution)
Sample injection volume: 10 μl
Eluent: Tetrahydrofuran (THF)
Flow rate (flow rate): 0.6 ml / min Column temperature (measurement temperature): 40 ° C
Column: Trade name “TSKgelSuperHM-H / H4000 / H3000 / H2000 (Tosoh Corporation)
Detector: Differential refractometer (RI)
A cross-linking agent and an additive were blended into the acrylic polymer after polymerization to obtain an adhesive composition (S5-4). As a cross-linking agent, 0.3 part by weight of a polyfunctional isocyanate compound (trade name “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd.) is added to 100 parts by weight of acrylic polymer solution A (100 parts by weight of acrylic polymer A). A solution-like adhesive composition was prepared. The adhesive composition thus obtained was applied to a release liner (S5-5). FIG. 6A is a schematic view showing this coating process. The release liner 60 is prepared in a roll form 60 a and is sent to a dryer 62 through a guide roll 61. On the release liner 60 fed out from the roll 60a, the adhesive solution adjusted in the above-described process is applied in a layer form by the coating device 63 on the way to the guide roll 61. In this example, as the release liner 60, a film of 38 μm thick polyethylene terephthalate (PET) whose surface was release-treated was used. The adhesive solution was applied to the release treatment surface of the release liner 60 so that the thickness after drying was 25 μm. The release liner 60 to which the adhesive solution has been applied is passed through a dryer 62 to evaporate the solvent of the adhesive solution. The release liner 60 exiting the dryer 62 is passed through a pair of nip rolls 64a and 64b. Further, the second release liner 65 fed from the second roll 66 is sent to the nip rolls 64a and 64b so as to overlap the layered adhesive formed on the first release liner 60, and the nip rolls are fed. 64a and 64b are pressed and bonded to the adhesive layer. The second release liner 65 is composed of the same film as the first release liner 60, but the adhesive layer has a lighter peeling force than that in the first release liner 60. A mold release treatment is performed on the surface to be bonded to.

The laminate that has exited the first nip rolls 64a and 64b has a structure in which the first and second release liners 60 and 63 are bonded to both sides of the adhesive layer 67 as shown in FIG. It is wound up as a roll 68. In FIG. 5, the drying process is shown in step S5-6, and the bonding process of the second release liner 65 is shown in step S5-7. The manufactured adhesive laminate 69 is shipped through product inspection (S5-8) (S5-9).
(Formation of polarizer film)
FIG. 7 is a schematic view showing the manufacturing process of the polarizer film. The film 71 as a raw material is made of a polymer material mainly composed of polyvinyl alcohol (PVA) resin, and is prepared in the form of a roll 72. The PVA film 71 fed out from the roll 72 is immersed in water in the water tank 73 and swollen with water. Next, the PVA film 71 swollen with water is passed through a dyeing tank 74 having a dyeing solution containing iodine, and the tank 74 is impregnated with iodine. The PVA film 71 impregnated with iodine is then passed through first and second crosslinking tanks 75 and 76. A crosslinking bath containing potassium iodide and boric acid is formed in the crosslinking tanks 75 and 76, and the crosslinking treatment proceeds here. In the course of this crosslinking treatment, the PVA film 71 is stretched. This stretching is performed by setting the driving speed of the roll for feeding the PVA film 71 through the crosslinking tanks 75 and 76 so that the outlet side is higher than the inlet side. The PVA film 71 that has undergone the stretching process is washed with a water washing tank 77, and protective films 78a and 78b are bonded to both surfaces to form a laminate 79 as shown in FIG. 7b.
(Formation of retardation film)
The retardation film can be adjusted by controlling the stretching ratio and stretching temperature of the resin film. The draw ratio can be appropriately determined according to the desired retardation, the thickness of the film necessary for optical compensation of the retardation film, the type of resin used, the thickness of the film used, the stretching temperature, and the like. The production of such a retardation film is well known. The quarter-wave retardation film used in the present invention is adjusted by using this known method so that a phase difference corresponding to a quarter-lambda phase is generated.
(Formation of polarization functional laminate)
The λλ retardation film formed as described above is bonded to the polarizer laminate 79 shown in FIG. 7B to obtain the polarization functional laminate used in the present invention. FIG. 8A shows a bonding process of the polarizer laminate 79 and the ¼λ retardation film. First, a dyeing process in which a PVA film serving as a substrate of the polarizer film is dyed with iodine. Through (S8-1) and the stretching step (S8-2), the polarizer film 71 shown in FIG. 7 is obtained and sent to the bonding step (S8-3) for bonding to the protective films 78a and 78b. In the bonding step (S8-3), the protective films 78a and 78b are bonded to both surfaces of the polarizer film 71. Next, an adhesive is applied to one surface of the polarizer film 71 (S8-4). The polarizer film 71 to which the adhesive is applied is cut into a dimension corresponding to the dimension of the optical unit in which the polarizer film is used, for example, by punching (S8-5). When the optical unit is in the form of a long roll and is used for a continuous bonding process with the display panel board, this cutting process is omitted.

The quarter-wave retardation film is subjected to adhesive coating (S8-6) and then cut into a dimension corresponding to the dimension of the optical unit (S8-7). As in the case of the polarizer film laminate 79, when the optical unit is used in the form of a long roll, this cutting step is omitted. As for the retardation film cut | judged as needed, the surface which is not adhesive-coated is joined to this laminated body 79 by the adhesive bond layer on the polarizer film laminated body 79 (S8-8). The obtained product is subjected to necessary finishing processing such as edge forming (S8-9), and after product inspection (S8-10), is sent to the next step. FIG. 8B shows the obtained polarizing functional laminate 81, and the polarizer film laminate 79 is bonded to the 1 / 4λ retardation film 80 via the adhesive layer 79a. An adhesive layer 80 a exists on the outer surface of the ¼λ retardation film 80. If necessary, a release liner (not shown) is bonded to the adhesive layer 80a on the outer surface of the 1 / 4λ retardation film 80. This polarizing functional laminate 81 has a circularly polarizing function by combining the polarizer film laminate 79 and the 1 / 4λ retardation film 80 in this order as viewed from the viewing side.
(Formation of touch panel laminate)
The basic constituent layers of the touch panel laminate 3 are a transparent substrate layer, an undercoat layer, an adhesive layer, and a transparent conductive layer. There is no restriction | limiting in particular as a material which comprises a base material layer, The various plastic film which has transparency can be used. Examples of the material for the base layer include polyester resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, and polyvinyl chloride resins. , Polyvinylidene chloride resin, polystyrene resin, polyvinyl alcohol resin, polyarylate resin, polyphenylene sulfide resin and the like. Among these, particularly preferred materials are polyester resins, polycarbonate resins, and polyolefin resins. Regarding the material of the base material layer, Patent Document 5 describes in detail, and any of the materials described herein can be used, but a polyethylene terephthalate (PET) film is generally used. As a commercially available PET film, there is a film manufactured by Mitsubishi Polyester Co., Ltd., which has a width of 1085 mm and a thickness of 23 μm and a thickness of 50 μm. A PET film provided with an oligomer prevention layer for preventing oligomers generated by heat received during the lamination process is available. In the configuration in which the touch panel laminate is disposed inside the polarizing functional laminate as viewed from the viewing side, the base material layer is preferably formed of polycarbonate or norbornene resin material instead of PET.

  The undercoat layer can be formed by any of the methods described in Patent Document 5. FIG. 9A shows an undercoat layer coating process. As a material for the undercoat layer, for example, a mixture in which a melamine resin, an alkyd resin, and an organosilane condensate are mixed at a weight ratio of 2: 2: 1 is used. This mixture has a solids weight ratio of 30% and is available from Momentive Performance Materials under the trade name SHC900. A liquid solvent for dilution is added to the undercoat raw material mixture, and the mixture is diluted and stirred (S9-1). For example, the solvent may be a mixture of cyclopentanone, toluene, and methyl ethyl ketone in a weight ratio of 4: 3: 3. The mixing ratio of the solvent is determined so that the solid content of the undercoat raw material mixture is 1.5% by weight. The diluted undercoat raw material mixture is applied to the surface of the PET film in which the oligomer prevention layer is previously formed on one side where the oligomer prevention layer is not formed (S9-2). By this step, as shown in FIG. 9B, an undercoat laminate 90 in which the oligomer prevention layer 92 is formed on one surface of the PET film 91 and the undercoat layer 93 is formed on the other surface is formed. If necessary, a second undercoat layer can be formed on the undercoat layer 93. In FIG. 9B, reference numerals 93a and 93b are shown in parentheses in order to represent an undercoat layer composed of two layers.

  A sputtering process for forming a conductive layer is performed on the undercoat laminate 90 formed as described above. FIG. 10A is a block diagram showing an example of this sputtering process. Sputtering of 90% by weight of indium oxide and 10% by weight of tin oxide in a vacuum atmosphere with respect to the surface of the undercoat layer 93b outside the undercoat laminate 90 formed by the process of FIG. 9A. The target material is sputtered in a plasma state with an introduced gas composed of 98 vol% argon and 2 vol% oxygen (S10-1). In this way, the conductive laminate 100 in which the conductive layer 101 shown in FIG. 10B is formed on the outer undercoat layer 93b is obtained. A release liner is bonded to the conductive laminate 100 with an adhesive layer (S10-2). FIG. 10C shows the conductive layer laminate 104 with an adhesive layer obtained by this step. As shown in FIG. 10 (c), the conductive layer laminate 104 with the adhesive layer has a first undercoat layer 93a and a second undercoat layer 93b in this order on one surface of the base material layer 91. The conductive layer 101 is further formed on the second undercoat layer 93b, and the release liner 103 is formed on the surface of the base material layer 91 opposite to the undercoat layer 93a via the adhesive layer 102. It is the laminated structure joined.

Fig.11 (a) is a figure which shows the bonding process of the adhesive bond layer 102 in FIG. In FIG. 11A, the conductive laminate 100 and the adhesive laminate 69 formed in the step shown in FIG. 6 are unwound from each roll and passed between a pair of nip rolls 110a and 110b. The conductive laminate 100 is supplied from a roll so that the oligomer prevention layer 92 faces the adhesive laminate 69. The adhesive laminate 69 is similarly prepared in a roll form, and the exposed adhesive layer 67 faces the conductive laminate 100 while the release liner 60 provided on one side is peeled off by the release roll 111. It is supplied between the nip rolls 110a and 110b. Thus, the conductive layer laminated body 104 with an adhesive layer shown in FIG.10 (c) is obtained. The conductive laminate 104 with the adhesive layer is wound in a roll shape as shown in FIG. The conductive laminate 100 shown in FIG. 10B is bonded to the adhesive-attached laminate 104 to form the touch panel laminate 3. FIG. 11B is a schematic view showing the bonding step. In FIG.11 (b), the electroconductive laminated body 100 is prepared with a roll form. The conductive laminate 100 is fed from the roll and sent between the pair of nip rolls 112a and 112b in a state where the oligomer prevention layer 92 on the base material layer 91 is on the lower side. The conductive laminate 104 with adhesive is fed out from the roll with the release liner 103 on the upper side, and the release liner 103 is peeled off by the release roll 113, so that the exposed adhesive layer 102 becomes the conductive laminate 100. In a state of facing the nip, it is fed between the nip rolls 112a and 112b. The laminates 100 and 104 are pressed and joined to each other by the nip rolls 112a and 112b to form a touch panel laminate. The conductive layers 101 on both surfaces of the touch panel laminate are heated and crystallized by a method such as passing through a drying oven, and then patterned into a desired pattern by a known etching process. The process of forming a pattern is well known and is described in detail in, for example, Patent Document 6, and detailed description thereof is omitted here. The touch panel laminated body 3 used for the optical unit shown in FIGS. 1 to 4 is obtained by forming a pattern on the conductive layer. A cross section of this touch panel laminate is shown in FIG.
(Formation of optical unit)
FIGS. 12A and 12B show a process according to an embodiment in which the polarizing functional laminate 5 is bonded to the touch panel laminate 3 to form the optical unit 1 of FIG. In the step shown in FIG. 12A, the touch panel laminate 3 is prepared in the form of a roll 121, and is fed out from the roll 121 and fed into the nips of a pair of nip rolls 122a and 122b. The adhesive laminate 69 shown in FIG. 6 is prepared in the form of a roll 123, is fed out from the roll 123, and one of the release liners 60 is peeled off by the release roll 124, and then exposed by peeling off the release liner 60. With the adhesive layer 67 thus applied facing the touch panel laminate 3, it is fed into the nip between the nip rolls 122a and 122b. The adhesive layer 67 constitutes the adhesive layer 9 in the configuration of FIG. 2, and the release liner 63 that remains without being peeled becomes the release liner 11 in the configuration of FIG. The touch panel laminate 3 and the adhesive laminate 67 are pressed and bonded to each other between the nip rolls 122a and 122b to form the laminate 125. This laminated body 125 is wound up in the form of a roll 126. Next, the laminated body 125 is fed out from the roll 126 and fed into the nip between the pair of nip rolls 127a and 127b with the side where the conductive layer is exposed facing up.

  The polarizing functional laminate 81 shown in FIG. 8B is an example in which a release liner 81a is bonded to the adhesive layer 80a, and is prepared in the form of a roll 128. The polarizing functional laminate 81 is fed into the nip between the pair of nip rolls 127a and 127b while the release liner 129 is peeled off by the release roll 129 with the adhesive layer 80a facing the laminate 125 on the laminate 125. The laminated body 125 and the polarization functional laminated body 81 are pressed and joined to each other by the nip rolls 127a and 127b to form the optical unit 1 shown in FIG. Here, the adhesive layer 80a in the laminate 81 becomes the adhesive layer 7 of the optical unit 1 in the structure of FIG. 2, and the polarization functional laminate 81 becomes the polarization functional laminate 5 in the structure of FIG.

When the optical unit 1 shown in FIG. 1 is formed, an adhesive layer corresponding to the adhesive layer 7 in the structure of FIG. 1 is formed on the polarizer film laminate 79 side, and polarized light is passed through this adhesive layer. The functional laminate is bonded to the touch panel laminate 3.
(Lamination of window or display panel board)
The optical unit 1 formed by the process of FIG. 12 has the layer configuration shown in FIG. 2, and the display panel plate 13 is bonded to the adhesive layer 9 of the optical unit 1. FIGS. 13A and 13B show the process. The optical unit 1 is sequentially placed at the bonding position as a sheet of the optical unit 1 in a state of being cut to a predetermined dimension corresponding to the display panel plate 13. Sent. The display panel board 13 is sent to the bonding position in synchronization with the sheet of the optical unit 1. Immediately before the bonding position, the release liner 11 is peeled off from the optical unit 1 and bonded to the display panel plate 13. As shown in FIG. 13B, the optical unit 1 is sucked and held by the vacuum suction table 131 in a state where the adhesive layer 7 faces the display panel plate 13 and is superposed on the display panel plate 13. It is fed into the nip between the pair of nip rolls 132a and 132b. The optical unit 1 and the display panel plate 13 are bonded to each other by the adhesive layer 7 by passing through the nip between the rolls 132a and 132b. By the same process, the window 15 can be bonded to the polarization functional laminate 5 over the entire surface thereof via an adhesive layer (not shown). In the display panel device obtained by the configuration shown in FIG. 2, the polarizing functional laminate 5 is disposed immediately below the window 15, so that the reflected light at the inner layer interface inside the polarizing functional laminate 5 is external to the window 15. Can be prevented.

  The optical unit 1 shown in FIG. 1 can also be bonded to the display panel board 13 and the window 15 in the same process. In this case, the polarizing functional laminate 5 is bonded to the display panel plate 13 over the entire surface via an adhesive layer (not shown). The polarization functional laminate 5 prevents the reflected light on the surface of the display panel board 13 from coming out of the window 15.

  FIG. 14 is a schematic view showing a system for bonding the optical unit 1 to the display panel plate 13 by a continuous process. In this example, the optical unit 1 is formed as a long continuous body and is prepared in the form of a roll 141. The optical unit 1 fed out from the roll 141 is driven and fed by a pair of feed rolls 142a and 142b, and passes through a guide roll 143, a dancer roll 144 that can be moved up and down with a predetermined tension, and a guide roll 145. Then, after passing through the notch forming position 146, it is sent to the bonding position 150 via the guide roll 147, dancer roll 148 and guide roll 149. At the cut formation position 146, the feeding of the optical unit 1 is temporarily stopped, and the slit 1a is formed in the width direction of the unit 1 by the cut blade 146a with an interval corresponding to the length or the width direction dimension of the display panel plate 13. It is formed. While the feeding of the unit 1 is stopped at the cut forming position, the feeding by the rolls 142a and 142b is continued, and during that time, the dancer roll 144 moves downward so that the unit 1 does not become slack. Adjust automatically. Further, the feeding is continued even at the bonding position 150, but here, the dancer roll 148 performs the adjusting function.

  In the configuration of the optical unit 1 shown in FIG. 2, the incision at the incision forming position is performed from the polarization functional laminate 5 side to a depth reaching the adhesive layer 7. That is, the release liner 11 is left without being cut. Thereby, the part except the release liner 11 of the optical unit 1 becomes an optical unit on a sheet cut to a length corresponding to the dimension of the display panel plate 13. At the stage where the slit 1 a is formed, the sheet of the optical unit 1 adheres to the release liner 11 and is sent together with the release liner 11. Such cut formation is referred to herein as “half cut”. The optical unit 1 in which the slits 1a are formed is peeled off from the release liner 11 by turning the release liner 11 acutely at a bonding position 150 with a wedge-shaped release blade 151. Here, the adhesive layer 7 of the optical unit 1 is exposed.

  In order to wind up the peeled release liner 11, feed rolls 152 a and 152 b are provided, and the release liner 11 is wound up as a roll 153. The sheet of the optical unit 1 peeled off from the release liner 11 is sent in the feeding direction at the bonding position 150 by a pair of bonding rolls 154a and 154b. The display panel 13 is fed to the laminating position 150 in synchronization with the feeding of the sheet of the optical unit 1, and is superimposed on the sheet of the optical unit 1 and passed through the nips of the laminating rolls 154a and 154b. Thereby, a display panel device in which the sheet of the optical unit 1 is bonded to the display panel plate 13 is formed.

  While the present invention has been illustrated and described in detail with reference to specific embodiments, the scope of protection of the present invention is not limited to the details of the illustrated embodiments, but is defined by the scope of the claims. It is determined by.

1: Optical unit 3: Touch panel laminate 5: Polarization functional laminate 7, 9, 31: Adhesive layer 11, 13: Release liner 13: Display panel board 15: Window 17: Border printing 32, 33: Oligomer prevention layer 34 , 35: transparent substrate layer 36, 38: undercoat layer 37, 39: transparent conductive layer 51: polarizer film 52: 1 / 4λ retardation film

Claims (6)

Optics formed as a long continuous body, wound around a roll, consisting of a combination of a touch panel laminate and a polarizing functional laminate for continuously producing a display panel device having a capacitive touch input function A roll of units,
The touch panel laminate includes an optically transparent first base material layer laminated on one surface of an optically transparent adhesive layer, and the first base material opposite to the adhesive layer. A first transparent conductive layer laminated on the surface of the layer via a first undercoat layer; an optically transparent second base material layer laminated on the other surface of the adhesive layer; Formed as a long continuous body comprising a second transparent conductive layer laminated via a second undercoat layer on the surface of the second base material layer opposite to the adhesive layer; The first and second transparent conductive layers are patterned in a predetermined pattern,
The polarization functional laminate is a long continuous body including a layer including at least a circularly polarizing element, and is optically transparent on a surface having one of the first and second transparent conductive layers of the touch panel laminate. Are bonded through a layer of adhesive
In the touch panel laminate, a release liner is detachably bonded to the surface having the other of the first and second transparent conductive layers through an optically transparent adhesive layer,
The adhesive layer that joins the release liner to the touch panel laminate is attached to the release liner with a weak release force so as to remain in the form of a layer on the touch panel laminate side when the release liner is peeled off,
A roll of an optical unit, wherein the optical unit of a long continuous body constituted by the touch panel laminate, the polarization functional laminate, and the release liner bonded to each other is wound around a roll. Optics formed as a long continuous body, wound around a roll, consisting of a combination of a touch panel laminate and a polarizing functional laminate for continuously producing a display panel device having a capacitive touch input function A roll of units,
The touch panel laminate includes an optically transparent first base material layer laminated on one surface of an optically transparent adhesive layer, and the first base material opposite to the adhesive layer. A first transparent conductive layer laminated on the surface of the layer via a first undercoat layer; an optically transparent second base material layer laminated on the other surface of the adhesive layer; Formed as a long continuous body comprising a second transparent conductive layer laminated via a second undercoat layer on the surface of the second base material layer opposite to the adhesive layer; The first and second transparent conductive layers are patterned in a predetermined pattern,
The polarization functional laminate is a long continuous body including a layer including at least a circularly polarizing element, and is optically transparent on a surface having one of the first and second transparent conductive layers of the touch panel laminate. Are bonded through a layer of adhesive
In the touch panel laminate, a hard coat film is bonded to the surface having the other of the first and second transparent conductive layers via an optically transparent adhesive layer,
A release liner is detachably bonded to the polarizing functional laminate through an optically transparent adhesive layer,
The adhesive layer that joins the release liner to the polarizing functional laminate is attached to the release liner with a weak adhesive force so as to remain in the form of a layer on the polarizing functional laminate side when the release liner is peeled off. ,
The optical unit of an elongated continuous body constituted by the touch panel laminate, the polarizing functional laminate, the hard coat film, and the release liner bonded to each other is wound around a roll. roll. Optics formed as a long continuous body, wound around a roll, consisting of a combination of a touch panel laminate and a polarizing functional laminate for continuously producing a display panel device having a capacitive touch input function A roll of units,
The touch panel laminate includes an optically transparent first base material layer laminated on one surface of an optically transparent adhesive layer, and the first base material opposite to the adhesive layer. A first transparent conductive layer laminated on the surface of the layer via a first undercoat layer; an optically transparent second base material layer laminated on the other surface of the adhesive layer; Formed as a long continuous body comprising a second transparent conductive layer laminated via a second undercoat layer on the surface of the second base material layer opposite to the adhesive layer; The first and second transparent conductive layers are patterned in a predetermined pattern,
The polarization functional laminate is a long continuous body including a layer including at least a circularly polarizing element, and is optically transparent on a surface having one of the first and second transparent conductive layers of the touch panel laminate. Bonded through an adhesive layer
In the touch panel laminate, a first release liner is detachably bonded to the surface having the other of the first and second transparent conductive layers through an optically transparent adhesive layer,
A second release liner is releasably bonded to the polarizing functional laminate on the surface opposite to the touch panel laminate via an optically transparent adhesive layer,
The adhesive layer that joins the first and second release liners has a weak adhesive force so as to remain in a layered manner on the polarizing functional laminate side and the touch panel laminate side when the release liner is peeled off. And attached to the second release liner,
An optical unit in which the optical unit of a long continuous body composed of the touch panel laminate, the polarization functional laminate, and the first and second release liners bonded to each other is wound around a roll. Rolls. A roll of the optical unit described in any one of claims 1 to 3, wherein the polarization functional laminate, characterized in that it comprises at least a linear polarization element layer and a 1 / 4.lamda retardation element layer An optical unit roll. A display panel device manufacturing method for manufacturing a display panel device using a roll of an optical unit according to any one of claims 1 , 3 and 4 .
The display panel board including the optical display element is sequentially sent to the bonding position,
Unwind the optical unit from the roll,
The portion excluding the release liner joined to the touch panel laminate of the optical unit is cut into a length in the feed direction corresponding to the length of the display panel plate in the feed direction, and joined to the touch panel laminate. Form a plurality of optical unit sheets supported in a continuous manner on a release liner,
At the bonding position, the sheet of the optical unit is peeled from the release liner bonded to the touch panel laminate of the optical unit, and the surface of the optical unit sheet opposite to the polarizing functional laminate is the display. Send the optical unit sheet so that it overlaps the panel plate,
A method of manufacturing a display panel, comprising: bonding the sheet of the optical unit to the display panel plate with an optically transparent adhesive that has adhered the peeled release liner. A display panel device manufacturing method for manufacturing a display panel device using a roll of an optical unit according to any one of claims 2 , 3 and 4 .
The display panel board including the optical display element is sequentially sent to the bonding position,
Unwind the optical unit from the roll,
A portion of the optical unit excluding the release liner bonded to the polarization functional laminate is cut into a length in the feed direction corresponding to the length of the display panel plate in the feed direction, and joined to the polarization functional laminate. Forming a sheet of a plurality of optical units supported continuously on the release liner;
At the bonding position, the sheet of the optical unit is peeled off from the release liner bonded to the polarizing functional laminate of the optical unit, and the surface of the optical unit sheet on the side of the polarizing functional laminate is the display. Send the optical unit sheet so that it overlaps the panel plate,
A method of manufacturing a display panel, comprising: bonding the sheet of the optical unit to the display panel plate with an optically transparent adhesive that has adhered the peeled release liner.

Images