JP2007079102A - Information display member and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display member with flexibility which prevents increase of production processes, crack generation of a conductive protection layer by bending, in which degradation of wettability on the surface of a web-like base film and twist of the information display base film by passing through a high temperature drying furnace, which are generated in a conventional technique to form the conductive protection layer by using a conductive paste, in the information display member where at least an electrode layer, an image display layer and cover film are arranged in this order on the base film and the conductive protection layer is formed on the electrode layer of an electrode extraction part and a method for manufacturing the same. <P>SOLUTION: The information display member is characterized in that the conductive protection layer is 100nm or more and 300nm or less. In addition, the method for manufacturing the information display member is characterized in that the conductive protection layer is formed by a dry type film forming method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information display member used for a time display board of a train or bus or a bulletin board on a street as a display member for electronic books and a large information bulletin board, and a manufacturing method thereof. In particular, the present invention relates to an information display member divided from a continuous web-shaped information display material into a plurality of individual products and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, paper media printed with various information such as advertisements and exhibition events are hung, pasted, or electronically displayed on a bulletin board of a train, bus, or store using a liquid crystal display.

  However, when a printed paper medium is used to display the various information, the information is manually switched by suspending or peeling the paper medium and replacing it with a new paper medium. It was. Such an artificial work takes time and labor and is very expensive.

  In the case of a book, there is a drawback that it is bulky to carry and store a large amount of information. In addition, once printed information cannot be rewritten, a problem of environmental destruction has been pointed out.

  In the method of electronically displaying using a liquid crystal display, for example, in order to install a liquid crystal display, it cannot be installed on a curved wall surface or cannot be suspended, and the installation location is limited or installed. There is a problem that it is difficult to carry around because of its bulkiness.

  In recent years, as a solution to the above-mentioned problems, an electrode layer, an image display layer of a microcapsule containing a dye material and a dissolved substance, and a transparent electrode layer are formed on a base film and are thin and flexible. An electronic book using an information display member has been proposed (for example, Patent Document 1).

  FIG. 2 shows an example of a conventional information display member. (A) is the top view, (b) is the BB surface sectional drawing of (a). Such a thin and flexible information display member comprises an electrode layer (2) on a web-like base film (1) made of paper or plastic as shown in the side view of FIG. 2 (b). The image display layer (4) using microcapsules, the transparent electrode layer (5), the adhesive layer (6), and the outermost cover sheet (7) are sequentially formed.

  Such an information display member is continuously cut by a laser into a shape including an electrode extraction portion (8) as shown in the front view of FIG. Unnecessary portions (cover sheet, electrode layer, image display layer) on the electrode extraction portion (8) were removed with a laser, and the electrode extraction portion was exposed to obtain individual products.

  At this time, when removing unnecessary portions, there is a problem that it becomes difficult to control the energy of the laser due to variations in each layer during the formation of each layer, and the electrode layer is damaged, resulting in a defective product.

Therefore, as a method for solving this problem, Patent Document 2 discloses a method of providing a conductive protective layer having conductivity on the electrode extraction portion. In Patent Document 2, there is a method in which a conductive protective layer is formed by a screen printing method or the like using a conductive paste in which a conductive filler is dispersed in a polyester resin having excellent flexibility as a binder in the presence of an organic solvent. It is shown. By this method, when unnecessary portions are removed with a laser, it has become possible to easily carry out with a relatively powerful laser in a short time.
Japanese National Patent Publication No. 11-502950 JP 2004-086192 A

  However, when the conductive protective layer is formed on the electrode layer by screen printing using a conductive paste, the formed conductive protective layer has a thickness of about 3 to 10 μm, and the image display layer is applied in the next step. There is a problem that the display layer cannot be coated around the protective layer, so-called coating omission failure occurs.

  Further, when the web-shaped substrate is wound into a roll, the conductive protective layer is thick, so that the winding shift or the deformation of the substrate film occurs, and when the web-shaped substrate is wound into a roll, Along with the bending, there is a problem that a crack occurs in the conductive protective layer and the electrical conductivity deteriorates.

  Therefore, the conductive protective layer (3) could not be formed on the stripe. Therefore, a conductive protective layer as shown in FIG. 9 is formed to have a size approximately equal to the electrode processing size, and is patterned in accordance with a cutting processing size by a laser or the like to form the conductive protective layer. In this case, it takes time to determine the conditions for cutting with a laser or the like, and there is a problem that defective products frequently occur if the position accuracy of the pattern of the conductive protective layer and the cutting accuracy with a laser or the like are poor. FIG. 9 is a layout pattern diagram of a conductive protective layer of a conventional information display member.

  Further, when the conductive protective layer is formed of a conductive paste, the display member is passed through a high-temperature drying furnace in order to dry the conductive paste. Then, as the conductive paste is dried, the diluent solvent bleeds around the conductive protective layer, reducing the wettability around the conductive protective layer, and when applying the image display layer, coating such as repellency and unevenness is applied. There was a problem that defects occurred.

  In addition, when a conductive paste is used, it is necessary to provide a drying step in order to remove the organic solvent in the paste. By passing the web-shaped substrate through a high-temperature drying furnace, the web-shaped substrate film is twisted, and when coating the image display layer, uneven coating defects occur or when cutting with a laser or the like. However, there was a problem that processing accuracy was reduced and defective products were frequently generated. In addition, ITO and IZO used for the electrode layer have a problem that the crystal structure varies due to the heat of the drying furnace, and the water vapor barrier property of the web-like substrate film is lowered.

  In addition, when the conductive paste is insufficiently dried, or when stored in a hot and humid place or stored at normal temperature and humidity for a long period of one year or longer, the conductive protective layer is transferred to the back surface of the substrate. There was a problem.

  Furthermore, when the conductive protective layer is formed by the screen printing method, another manufacturing process increases, and as a result, material costs and labor costs increase, and further, the product yield decreases due to an increase in work processes. It was.

  The present invention solves such problems of the prior art, and increases the number of production processes and cracks in the conductive protective layer due to bending, which occur when the conductive protective layer is formed using the conventional conductive paste. Providing flexible information display members that prevent occurrence, decrease the wettability of the surface of the web-shaped substrate film, and prevent the information display substrate film from being twisted by passing it through a high-temperature drying furnace, and methods for producing the same The purpose is to do.

  In order to solve the above-described problem, the invention according to claim 1 is provided such that at least an electrode layer, an image display layer, and a cover film are disposed in this order on a base film, and the electrode is taken on the electrode layer in an electrode takeout portion. The information display member in which the protective layer was formed WHEREIN: The said conductive protective layer was 100 nm or more and 500 nm or less, It was set as the information display member characterized by the above-mentioned.

  The invention according to claim 2 provides the information display member according to claim 1, wherein the conductive protective layer is formed using any one of silver, copper, aluminum, and nickel.

  According to a third aspect of the present invention, there is provided the method for producing an information display member according to the first or second aspect, wherein the conductive protective layer is formed by a dry film forming method.

  According to a fourth aspect of the present invention, there is provided the method for producing an information display member according to the third aspect, wherein the conductive protective layer is patterned using a deposition preventing plate.

  The conductive protective layer can serve as an electrode extraction portion even if the electrode extraction portion is not exposed, and also includes an image display layer, an adhesive layer on the conductive protection layer by laser irradiation or wiping, and When the cover film is removed, it is possible to effectively protect the electrode extraction portion from damage.

  According to the present invention, the conductive protective layer has a thin film thickness of about 100 to 500 nm, and even when the web-like substrate film is wound into a roll, no cracks are generated in the conductive protective layer, and when the display layer is applied The coating was uniform without any obstacles. Also, when the electrode extraction part is formed by irradiating with laser, it is more likely to be damaged by laser irradiation compared to the conventional conductive paste, but it can be laser processed without being damaged by appropriately adjusting the laser output. did it.

  By using a metal having good electrical conductivity such as silver, copper, aluminum, or nickel, the conductive protective layer could function as an electrode in the extraction electrode portion.

  Since the conductive protective layer was formed by dry film formation, the transparent electrode layer and the conductive protective layer could be formed in the same process on the base film. Further, since the substrate film was not exposed to high temperature, the display layer could be applied uniformly without causing deformation of the film or reduction in wettability. Further, unlike the case of using a conductive paste, the display substrate film is not passed through a high-temperature drying furnace, so that the film does not twist. Moreover, the wettability of the substrate film surface did not decrease, and the display layer could be applied uniformly.

  When the conductive protective layer was formed by a dry film formation method, the width of the conductive protective film could be easily changed depending on the size of the deposition preventing plate used. Further, the conductive protective layer can be formed in a stripe shape by the deposition preventing plate, and the laser conditions can be easily determined in the unnecessary portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing an example of an individual product of an information display member according to an embodiment of the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a B- in FIG. 1 (a). It is a sectional side view showing B section.

  As shown in FIG. 1, a first electrode layer (11) is provided on the base film (1), and an image display layer (11) is formed on a portion of the first electrode layer (11) excluding the electrode extraction portion (8). 4), and a conductive protective layer (3) is provided on the electrode extraction part (8) of the transparent electrode layer (2). A second electrode layer (12) is provided on the image display layer (4), an adhesive layer (6) is further provided on the second electrode layer (12), and finally an adhesive layer. (6) The cover film (7) is provided on the thin information display member having flexibility.

  In addition, the electrode extraction part (8) protrudes and is provided in the side of the peripheral part of the information display member (1). The thickness of the conductive protective layer (3) needs to be 100 nm or more and 500 nm or less. When the thickness of the electrode extraction portion is less than 100 nm, the first electrode layer is damaged when the unnecessary portion is removed with a laser. Further, in order not to damage the first electrode layer, it becomes difficult to control the energy of the laser. Moreover, when the thickness of an electrode extraction part exceeds 500 nm, it becomes an obstacle at the time of applying an image display layer, and so-called coating omission that the image display layer cannot be applied around the conductive protective layer occurs. Moreover, a crack will generate | occur | produce in an electroconductive protective layer.

  The information display member according to one embodiment of the present invention shown in FIG. 1 is manufactured as follows. 4-7 is explanatory drawing which shows an example of the manufacturing process of the information display member based on one Embodiment of this invention. First, as shown in the plan view of FIG. 1 (a) and the side cross-sectional view of FIG. An electrode layer (11) is formed, and a conductive protective layer (3) is partially formed on the electrode extraction part (8) of the first electrode layer (11).

  11 and 12 show a method for forming a conductive protective layer by a dry film forming method. As shown in FIGS. 11 and 12, the conductive protective layer (3) covers the web-like base film with an adhesion-preventing plate, and is sputtered in the form as shown in FIG. A conductive protective layer (3) is formed. Only a part of the target particles jumping out of the target 10 is formed on the web-shaped base film (1) by the deposition preventing plate (9), and the obtained pattern is a line shape or a stripe shape composed of a plurality of lines. Become. In addition, it is also possible to form a conductive protective layer with better patterning accuracy by laminating a masking film on a substrate.

  Next, as shown in the side sectional view of FIG. 4, the image display layer (4) is formed on the entire surface including the conductive protective layer (3), and further, as shown in the side sectional view of FIG. (4) A second electrode layer (12) is formed thereon.

  Subsequently, as shown in the side sectional view of FIG. 6, an adhesive layer (6) is formed on the second electrode layer (12), and a web-like cover film (7) is formed on the adhesive layer (6). Are laminated to produce a thin and flexible web-shaped information display member (1) that can be multi-faceted.

  The web-shaped material obtained in the above-described manner and capable of being chamfered in multiple directions, for example, as shown in the plan view of FIG. And the edge part of the width direction is cut | disconnected by the slit line L. FIG.

  Thereafter, the web-like material (2) cut in a single row in this way is cut or cut using laser light irradiation or a rotary cutter. For example, as the laser beam irradiation means, any laser beam can be used as long as a cut is formed or cut in the base film. If the base film is a resin film, a carbon dioxide laser is usually used. Depending on the material of the film, a YAG laser, excimer laser, wavelength tunable die laser, or the like can also be used.

  In addition, exposure of the conductive protective layer, that is, removal of the image display layer, electrode layer, adhesive layer, and cover film on the conductive protective layer, should be performed by laser irradiation, so-called laser ablation, or wiping with a nonwoven fabric or the like. Can do. Wiping with a non-woven fabric or the like is usually performed after removing the cover film by other means.

  The web-shaped material (2) that has been cut and laser-processed as described above is then divided along the cutting line, and is a thin and flexible information display member that is an individual product. Become.

  Examples of the base film constituting the information display member according to the embodiment of the present invention include biaxially stretched polyethylene terephthalate (PET), stretched polyethylene (OPE), biaxially stretched polypropylene (OPP), and stretched nylon having a thickness of about 20 μm. (ONy), ionomer (IO), and the like are mentioned. From the viewpoint of various strengths and ease of handling, a biaxially stretched polyethylene terephthalate film can be preferably used.

  As the first electrode layer and the second electrode layer, indium tin oxide (ITO), indium zinc oxide (IZO), or the like can be used, and is formed on the substrate by a dry film forming method such as a sputtering method. In addition, an electrode film in which an active matrix electrode, a segment electrode, a simple matrix electrode, or the like is formed on a transparent plastic film having excellent dimensional stability such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyimide is used. You can also. In addition, since the electrode on the observation direction side needs to be transparent, ITO and IZO are preferably used.

  The conductive protective layer can be formed by a dry film forming method using silver, aluminum, copper, or nickel as a target. In addition, the metal species to be used can be appropriately selected depending on the application. Examples of dry deposition methods include vacuum deposition, sputter deposition, ion plating, laser deposition, and ion beam deposition. By forming a film using the same deposition method as the first electrode, the equipment cost is reduced. Can be suppressed.

  As an image display body used for the image display layer, for example, an electroluminescence material, a gas polymer dispersed liquid crystal, a strong magnetic liquid crystal, or a microcapsule electrophoresis method can be used. A schematic diagram of a microcapsule electrophoresis system including microcapsules (110) is shown in FIG. An example of this microcapsule (110) is, for example, a methacrylic acid resin, urea resin, gum arabic, or the like as a capsule shell (111), inside which are white particles (113) made of titanium oxide and black particles made of carbon black. (114) is encapsulated in a state of being dispersed in a highly viscous dispersion medium (112) such as silicone oil. White particles of titanium oxide are positively charged, while black particles of carbon black are negatively charged. Since the size of the microcapsules is as small as several tens to several hundreds of μm, when the microcapsules are dispersed in a transparent binder, they can be coated like ink.

  The adhesive layer is appropriately provided between the second electrode layer and the cover film, between the image display layer and the second electrode layer, and is not limited. Examples of the adhesive layer include a pressure-sensitive adhesive (pressure-sensitive adhesive) and a heat-sensitive adhesive in consideration of mounting and the like.

  Examples of the former pressure-sensitive adhesive include a urethane resin pressure-sensitive adhesive composed of a urethane prepolymer obtained by reacting a polyol and a polyisocyanate in the presence of a catalyst such as hexahydrodimethylaniline and a deterioration inhibitor. be able to. As the polyol, polyester polyol, polyether polyol and the like are used, and as the polyisocyanate, aromatic polyisocyanate, aliphatic polyisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, tolidine diisocyanate, polymethylene polyphenylene polyisocyanate, Tolidine diisocyanate, naphthalene diisocyanate and the like are used. Furthermore, as the aliphatic polyisocyanate, for example, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, dicyclohexylmethane diisocyanate and the like are used.

  Examples of the latter heat-sensitive adhesive include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), high density polyethylene (HDPE), and unstretched polypropylene (CPP) as resins having excellent heat sealability. A polyolefin film having a thickness of about 50 μm can be suitably used.

  However, since these polyolefin resins alone may not be able to balance the adhesive strength and peel strength, for example, these polyolefin resins are further mixed with incompatible components such as polystyrene and polybutene with respect to polyolefin resins. It is also possible to extrude a melt of these mixed resins to form an easily peelable adhesive layer. It is also possible to use a hot melt adhesive made of ethylene-vinyl acetate copolymer resin or the like.

  As the cover film of the information display member according to the present invention, for example, biaxially stretched polyethylene terephthalate (PET), stretched polyethylene (OPE), biaxially stretched polypropylene (OPP), stretched nylon (ONy), ionomer (about 20 μm thick) Although a film such as IO) can be mentioned, a biaxially stretched polyethylene terephthalate film can be suitably used from the viewpoints of various strengths and ease of handling.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, you may delete a some component from all the components shown by embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  For example, it is possible to drive by peeling the cover film and the second electrode from the image display layer and attaching them to a substrate having another electrode. In this case, it is not necessary to provide the second electrode. Moreover, it is also possible to peel a cover film with respect to the obtained information display member, and to affix on a wall surface or another apparatus.

  An information display medium using the microcapsule electrophoresis system operates as follows. FIG. 10 is an explanatory view showing an example of the display form of the image display layer constituting the information display member according to the embodiment of the present invention. As shown in the schematic view of FIG. 11, the transparent electrode layer (13) and the electrode layer ( 14) When an electric field is applied to the transparent electrode layer (13) as a negative electrode and the electrode layer (14) as a positive electrode, positively charged white particles (113) are drawn to the transparent electrode layer (13) side, Since the black particles (114) are attracted to the electrode layer (14) side, the portion looks white when observed from above the transparent electrode layer (13) side.

  Conversely, when the transparent electrode layer (13) is the positive electrode and the electrode layer (14) is the negative electrode, the positively charged white particles (113) are attracted to the electrode layer (14) side and become black. Since the particles (114) are attracted to the transparent electrode layer (12a) side, the portion looks black when observed from above the transparent electrode layer (13) side.

  As shown in the schematic side sectional view of FIG. 14, the image display layer has a large number of such microcapsules. By controlling the electric field of each address electrode of the transparent electrode, a desired character or figure can be displayed in white. And black pixels.

It is a figure which shows the information display member which concerns on one Embodiment of this invention, (a) is the top view, (b) is the BB surface sectional drawing of (a). It is a figure explaining an example of manufacture of the conventional information display member, (a) is the top view, (b) is the BB surface sectional drawing of (a). It is a figure which shows the information display member which concerns on one Embodiment of this invention, (a) is the top view, (b) is the BB surface sectional drawing of (a). It is a sectional side view explaining formation of the image display layer in the manufacturing process of the information display member which concerns on one Embodiment of this invention. It is a sectional side view explaining formation of the transparent electrode layer in the manufacturing process of the information display member concerning one embodiment of the present invention. It is a sectional side view explaining formation of the adhesive bond layer and cover film in the manufacturing process of the information display member concerning one embodiment of the present invention. It is a top view which slits the wide web-like information display member in the manufacturing process of the information display member concerning one embodiment of the present invention. It is a formation arrangement pattern figure of the conductive protection layer in the conventional information display member. It is explanatory drawing which shows typically the microcapsule contained in the image display layer which comprises the information display member which concerns on this invention. It is a sectional side view showing typically an example of a display form of an image display layer which constitutes an information display member concerning the present invention. (A) at the time of forming the electroconductive protective layer which concerns on one Embodiment of this invention by sputtering has shown the arrangement | positioning drawing of an adhesion prevention board, (b) is the web-like base film after forming an electroconductive protective layer FIG. It is explanatory drawing at the time of forming the electroconductive protective layer which concerns on one Embodiment of this invention by sputtering. It is side sectional drawing which represents typically an example of the information display member which concerns on this invention.

Explanation of symbols

1 Base film 2 Electrode layer 3 Conductive protective layer
4 Image Display Layer 5 Using Microcapsules 5 Transparent Electrode Layer 6 Adhesive Layer 7 Cover Sheet 8 Electrode Extraction Part 9 Deposition Plate 10 Target 11 First Electrode Layer 12 Second Electrode Layer 13 Transparent Electrode Layer 14 Electrode Layer 110 Microcapsule 111 capsule shell 112 dispersion medium 113 white particles 114 black particles

Claims (4)

In an information display member in which at least an electrode layer, an image display layer, and a cover film are arranged in this order on a base film, and a conductive protective layer is formed on the electrode layer in an electrode take-out portion,
The information display member, wherein the conductive protective layer is 100 nm or more and 500 nm or less.   The information display member according to claim 1, wherein the conductive protective layer is formed using any one of silver, copper, aluminum, and nickel.   The method for manufacturing an information display member according to claim 1, wherein the conductive protective layer is formed by a dry film forming method.   4. The method for manufacturing an information display member according to claim 3, wherein the conductive protective layer is patterned using a deposition preventing plate.

Images