JP4279890B2 - Protective panel for electronic device display window and method for manufacturing protective panel - Google Patents

Description

  The present invention relates to a protection panel for an electronic device display window that is fitted in a display window opening of a casing of an electronic device and protects the surface of a display device provided in the vicinity of the display window opening of the casing, and a method for manufacturing the protective panel About.

  As for the casing in electronic devices, such as a mobile phone and a smart phone, the flat thing comprised combining the front casing and back casing made from a synthetic resin is common. Specifically, the front casing is provided with an opening for a display window in which a liquid crystal display device or the like is arranged, and a protective panel is fused or the like to protect the surface of the display device provided below the display window. It is fixed.

  Various ideas have been proposed for this protective panel. For example, Japanese Patent Laid-Open No. 2002-72214 discloses a protection panel with a combination of a λ / 4 plate, a polarizing plate, and a transparent protective plate in order to solve the problem that the liquid crystal display becomes extremely difficult to see in a bright room or outdoors due to reflection. Configuration is disclosed. It is also disclosed that the transparent protective plate is used as a touch panel or a hard coat film or a low reflection film is bonded to give an additional function to the outermost surface of the protective panel.

Recently, with the trend toward fashion of electronic devices, as described in Japanese Patent Application Laid-Open No. 2001-318612, decorations such as fringing have been applied to the protective panel by printing. .
JP 2002-72214 A JP 2001-318612 A

  However, the decoration on the protective panel by the above printing has a problem in that it is disadvantageous in terms of productivity because the protective panel must be molded and printing must be performed for each molded protective panel.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems and provide a protective panel for an electronic device display window and a method for manufacturing the protective panel that are excellent in productivity.

In order to achieve the above object, according to the first aspect of the present invention, the display window for protecting an exposed portion from the display window opening of the display device provided in the display window opening portion of the casing of the electronic device. A protection panel for an electronic device display window fitted in the opening for use,
A transparent protective plate provided opposite to the exposed portion surface of the display device;
The display window opening of the display device has a transparent hard coat film and a decorative portion formed in a thin film on a part of one surface of the hard coat film, and the decorative portion is not formed. A decorative film provided with a window forming layer formed as a transparent window portion configured such that an exposed portion can be visually recognized;
A transparent adhesive layer for adhering the decorative film to the surface of the transparent protective plate on the side not facing the display device so that the window forming layer is located on the surface side of the transparent protective plate; Provide protection panel for electronic device display window.

  According to the 2nd aspect of this invention, the said decorating part is provided as a printing layer in the periphery of the said decorating film, and the said transparent window part is formed in the center part of the said decorating film. A protection panel for an electronic device display window is provided.

  According to the third aspect of the present invention, the decorative film further provides a protective panel for an electronic device display window according to the first aspect, wherein the first low-reflection treatment layer is provided.

  According to a fourth aspect of the present invention, there is provided the electronic device display window protection panel according to the third aspect, wherein the first low reflection treatment layer is provided on the entire other surface of the hard coat film.

  According to a fifth aspect of the present invention, there is provided the electronic device display window protective panel according to the first aspect, wherein the transparent protective plate is optically isotropic and a polarizing plate is provided on any surface. .

  According to a sixth aspect of the present invention, there is provided the protective panel for an electronic device display window according to the fifth aspect, wherein the polarizing plate is provided on a surface of the transparent protective plate that is not opposed to the display device.

  According to a seventh aspect of the present invention, the transparent protective plate is the electronic device display window protective panel according to the fifth aspect in which a second low-reflection treatment layer is provided on the surface facing the display device. provide.

  According to an eighth aspect of the present invention, there is provided the electronic device display window protection panel according to the seventh aspect, wherein the second low reflection treatment layer is composed of a λ / 4 plate.

  According to a ninth aspect of the present invention, the transparent protective plate has the movable electrode film at a peripheral portion so as to form an air layer between the movable electrode film laminated with the decorative film and the movable electrode film. A protective panel for an electronic device display window according to any one of the first to eighth aspects, comprising a touch panel provided with a fixed electrode plate bonded to the electronic device.

According to the tenth aspect of the present invention, the electronic device display window fitted in the display window opening that protects the exposed portion from the display window opening of the display device provided in the casing display window opening portion of the electronic device. A method for manufacturing a protective panel of
A portion of one surface of the hard coat film is provided with a window forming layer having a decorative portion formed in a thin film shape, and a portion where the decorative portion is not provided is from the display window opening of the display device Form a plurality of decorative areas formed as transparent windows that allow the exposed part to be seen through, creating a large decorative film,
The large format decorative protective film having an area larger than the decorative region is bonded to the large format decorative film so that the decorative portion is in a direction facing the surface of the large format transparent protective plate,
A protective panel for an electronic device display window, wherein the laminated large-sized decorative film and the large-sized transparent protective plate are integrally cut to obtain a protective panel at an outer position of the transparent window and an inner position of the decorative region. A manufacturing method is provided.

  Since the protection panel for an electronic device display window according to the present invention is configured as described above, the following effects can be obtained.

  That is, the protection panel for an electronic device display window of the present invention is such that a decorative film in which a window forming layer having a transparent window portion is formed in advance on the back surface of a hard coat film is laminated on the surface of a transparent protective plate. Therefore, it is not necessary to perform printing for each protection panel. Moreover, when configured in this way, when printing on the hard coat film that is the object of forming the window forming layer, it becomes possible to continuously print a large number of patterns in the form of a roll, At the time of manufacture, productivity of a protection panel can be improved by bonding these large decorative films and large transparent protective plates together and cutting them integrally. Moreover, since the window forming layer is disposed between the hard coat film and the transparent protective plate and is not exposed to the outside, there is no paint drop off of the decorative portion due to use over time. Furthermore, since the decorating part is provided as a thin film, there is no problem that irregularities are formed on the surface of the decorative film, and bubbles are formed in the case of being stuck to the transparent protective plate. It does not occur.

  Before continuing the description of the present invention, the same parts are denoted by the same reference numerals in the accompanying drawings. Hereinafter, the present invention will be described in more detail with reference to the drawings.

  The protective panel for an electronic device display window of the present invention is a thin resin panel as shown in FIG. 6, and covers the display window opening of the casing of the electronic device as shown in FIG. That is, the front casing 21 is provided with a display window opening 22 for arranging the liquid crystal display device 15 and the like, and a protective panel is provided to protect the surface of the display device 15 provided below the display window opening 22. It is fixed by fusion or the like.

  A protective panel 1 for an electronic device display window is provided with a decorative portion 2 and a transparent window portion 3. When the protective panel is disposed in the electronic device display window, the liquid crystal panel 15 provided below the protective panel 1 can be viewed from the transparent window portion 3. As will be described later, the decorative portion 2 is formed by a decorative film 7 including a window forming layer 6 having a decorative portion provided around the protective panel, and a portion where the decorative portion is not formed is transparent. Formed as window portion 3. Therefore, the decorative film 7 may be provided over the entire surface of the protective panel, and the decorative film 7 having a window forming layer is bonded to the surface of the transparent protective plate forming the protective panel, and then the transparent protective plate 4 and It can create by cut | disconnecting the decorating film 7 integrally.

  For example, as shown in FIG. 8, a roll-shaped decorative film 23 formed with a plurality of decorative regions 26 provided with the decorative portion 2 is attached to a large transparent protective plate 24 using a transparent double-sided tape 25. After that, the transparent protective plate and the decorative film bonded together can be integrally cut and then created. The position at which the large transparent protective plate 24 and the roll-shaped decorative film 23 are integrally cut is preferably outside the transparent window 3 and inside the decorating region 26. By comprising in this way, the protection panel in which the decoration layer 2 was formed to the peripheral part can be created.

  The protective panel shown in FIG. 6 is a laminated structure of the transparent protective plate 4 and the decorative film 7, and specifically has, for example, a cross-sectional structure as shown in FIG.

  In the protective panel 1 a shown in FIG. 1, a decorative film 7 is stuck in a laminated state on the surface of the transparent protective plate 4 by a sticking layer 10, and a second low reflection treatment layer 11 is formed on the back surface of the transparent protective plate 4. Has been. Moreover, the decoration film 7 forms the window formation layer 6 which has the decoration part 2 in the surface at the side of the transparent protective board 4 of the hard coat film 5, and forms the 1st low reflection process layer 12 in the opposite surface. It will be.

  The first and second low-reflection treatment layers 12 and 11 may each be capable of optically reducing some reflection in order to make the display of the liquid crystal panel 15 viewed through the transparent window portion easy to see. The configuration is not particularly limited.

  As the transparent protective plate 4, a material that has excellent transparency and can protect the liquid crystal panel 15 from breakage is used. For example, general-purpose resins such as polystyrene resin, polyolefin resin, ABS resin, AS resin, acrylic resin, and AN resin can be used. In addition, general-purpose engineering resins such as polystyrene resins, polycarbonate resins, polyacetal resins, polycarbonate-modified polyphenylene ether resins, polybutylene terephthalate resins, ultrahigh molecular weight polyethylene resins, polysulfone resins, polyphenylene sulfide resins, polyphenylene oxide resins, Super engineering resins such as polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin, and polyallyl heat-resistant resin are used.

  For the formation of the second low reflection treatment layer 11 provided on the back surface of the transparent protective plate 4, the following low reflection treatment method can be used. For example, a low-reflective material using a low refractive index resin such as a fluororesin or a silicon resin is applied, a metal multilayer film is formed by vapor deposition, a low-reflective film is attached, sandblasting or embossing, For example, the surface may be processed into a satin finish by mat coating or etching.

  The hard coat film 5 of the decorative film 7 is made of acrylic on one or both sides of a transparent resin film such as an engineering plastic such as polycarbonate, polyamide or polyether ketone, acrylic, polyethylene terephthalate or polybutylene terephthalate. What formed the hard-coat process layer by resin, silicon resin, UV curable resin, etc. is used. In addition, when forming a hard-coat process layer on one side, let the surface in which the hard-coat process layer is not formed be the transparent protection board 4 side.

  For the formation of the first low reflection treatment layer 12 of the decorative film 7, a low refractive index resin such as a fluororesin or a silicon resin is used similarly to the second low reflection treatment layer 11 on the back surface of the transparent protective plate 4. Apply the low-reflective material used, form a multilayer metal film by vapor deposition, paste a low-reflective film, sandblasting, embossing, mat coating, etching, etc. And so on. The timing for forming the first low reflection treatment layer 12 may be before or after the window forming layer 6 is formed on the hard coat film 5.

  The decorative film 7 has a transparent window part and a decorative part. The protective panel 1 obtained by laminating the decorative film 7 on the surface of the transparent protective plate 4 has a decorative part. 2 and the part where the decoration part 2 is not provided becomes the transparent window part 3. The decorative portion 2 is provided only around the decorative film, and is formed so that the transparent window portion 3 is formed at the central portion, for example, concealing the electrode portion provided around the liquid crystal panel 15 It can also be used as a part.

  As a material of the decoration part of the window forming layer 6, polyvinyl chloride resin, polyamide resin, polyester resin, polyacrylic resin, polyurethane resin, polyvinyl acetal resin, polyester urethane resin, cellulose ester resin A colored ink containing a resin such as an alkyd resin as a binder and an appropriate color pigment or dye as a colorant may be used. As a method for forming the decoration portion, a gravure printing method, a screen printing method, or the like may be used. By forming the decorative portion in the window forming layer in a thin film by a printing method, the unevenness formed on the surface of the decorative film is reduced, and the transparent protective plate 4 and the decorative film 7 are applied when pasting on the transparent protective plate. Bubbles are less likely to occur between the two.

  Further, the window forming layer 6 may be composed of a metal thin film layer or a combination of a printed layer and a metal thin film layer. The metal thin film layer is used to express metallic luster as the window forming layer 6 and is formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like. In this case, a metal such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, or zinc, or an alloy or compound thereof is used depending on the metallic luster color to be expressed. The metal thin film layer is usually formed partially. Moreover, when providing a metal thin film layer, in order to improve adhesiveness with another layer, you may provide a front anchor layer and a rear anchor layer.

  A transparent double-sided tape can be suitably used for the adhesive layer 10, but a transparent adhesive may be used. The adhesive layer may be provided on the entire surface of the decorative film 7 or may be provided only on a portion where the decorative portion of the window forming layer is provided in order to improve the visibility of the transparent window portion. Good.

  By configuring as described above, this protective panel is excellent in productivity. That is, since the decorative film 7 in which the window forming layer 6 having the decorative portion and the transparent window portion is formed in advance on the back surface of the hard coat film 5 is laminated on the surface of the transparent protective plate 4. There is no need to print. In addition, when the decorative portion is provided on the hard coat film 5 or the transparent resin film 12 to be formed with the window forming layer 6, it becomes possible to continuously print a large number of patterns by making these films into a roll shape. Therefore, the productivity of the protection panel can be improved.

  In addition, the protection panel of the electronic device display window according to the embodiment of the present invention is not limited to the above-described configuration. For example, the protective panel 1b shown in FIG. 2 is configured by laminating a decorative film 7 on the surface of an optically isotropic transparent protective plate 4 via a polarizing plate 8 (see FIG. 2). In this case, at least the window forming layer 6 having a decorative portion and a transparent window portion is formed on the surface of the hard coat film 5 on the transparent protective plate 4 side. By disposing the polarizing plate 8 in this way, the reflected light from the liquid crystal panel 15 side can be reduced. In addition, when the protective panel is arranged in an electronic device, the window forming layer 6 is configured to be positioned in front of the polarizing plate 4, and thus the visibility of the window forming layer 6 is good. On the other hand, when the window forming layer 6 is positioned on the back side of the polarizing plate 4, the window forming layer 6 is seen through the polarizing plate 4, so that the visibility of the window forming layer is deteriorated. The polarizing plate 8 can be one normally used in the field of liquid crystal display, for example, a uniaxially stretched film in which a dichroic substance such as iodine or a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin. In general, the protective film is used in a state where protective films are laminated on both surfaces of a uniaxially stretched film on which such a dichroic substance is adsorbed and oriented. When this protective panel is used, the polarizing plate provided on the liquid crystal panel 15 can be omitted.

  By the way, as a method for decorating a protective panel of an electronic device display window, JP-A-2001-318612 describes a transfer in-mold method and an insert method. Although these methods can be used only for decoration on the transparent protective plate 4, they cannot be used in the case of the configuration including the polarizing plate 8 described above. This is because when the printed sheet is inserted into the mold and the molten resin is injected, the polarizing plate 8 is altered by heat. If the decorative film 7 is laminated on the transparent protective plate 4 on which the polarizing plate 8 is provided, the polarizing plate 8 will not be altered.

  Further, in the protective panel 1c for an electronic device display window according to another embodiment of the present invention, a λ / 4 plate 9 may be further laminated on the back surface of the transparent protective plate 4 in the configuration including the polarizing plate 8 (see FIG. 3). The λ / 4 plate 9 is a wave plate having a function of causing a quarter-wave phase difference in incident light. The λ / 4 plate 9 may be disposed between the polarizing plate 8 and the transparent protective plate 4 (see FIG. 5). The λ / 4 plate 9 and the polarizing plate 8 are combined so that their optical axes are relatively at an angle of about 45 ° to form a circularly polarizing plate. This circularly polarizing plate functions as an antireflection filter that efficiently absorbs internal reflection due to incident light from the outside, and can improve visibility.

  The λ / 4 plate 9 can be a uniaxially stretched film of various polymer materials generally employed in the liquid crystal display field. Examples of the material include polyvinyl alcohol, norbornene resin, cellulose resin, and polycarbonate. However, it is not limited to these.

  Moreover, in each structure which has arrange | positioned the said polarizing plate 8, you may comprise the transparent protective plate 4 with the touch panel 14 (refer FIG. 4). As the touch panel, those that have been widely used can be used, and the movable electrode film laminated with the decorative film 7 is bonded to the movable electrode film at the peripheral portion so as to form an air layer therebetween. And a fixed electrode plate.

  Moreover, as for the electronic device display window protection panel 1 of the present invention, the decorative film 7 is formed by forming a window forming layer 6 on the surface of the hard coat film 5 on the transparent protective plate 4 side through a transparent resin film. Also good. In this case, the window forming layer 6 may be formed after the transparent resin film is bonded to the hard coat film 5, or the transparent resin film having the window forming layer 6 formed on the surface of the transparent protective plate 4 is used as the hard coat film. 5 may be pasted together. In the present invention, as the decorative film 7, a transparent resin film in which the window forming layer 6 is formed on the surface of the hard coat film 5 is bonded to the surface of the hard coat film 5 on the transparent protective plate 4 side. May be.

(Example 1)
Using a PET base single-sided hard coat film (with low reflection treatment) with a thickness of 0.075 mm, a window forming layer having a transparent window on the opposite side of the hard coat surface is formed by a gravure printing method and decorated. A film was obtained. Next, the decorative film is bonded to the surface of an optically isotropic transparent protective plate made of an acrylic plate having a thickness of 1.0 mm with a transparent double-sided tape so that the window forming layer side is the back surface, while the transparent protective plate A low-reflective treatment layer was formed by pasting a low-reflective film (manufactured by NOF Corporation) on the back of the film.

  This protective panel was excellent in productivity because a decorative film in which a window forming layer having a transparent window portion was previously formed on the back surface of the hard coat film was laminated on the transparent protective plate surface.

(Example 2)
Using a PET base single-sided hard coat film having a thickness of 0.075 mm, a window forming layer having a transparent window on the opposite side of the hard coat surface was formed by a gravure printing method to obtain a decorative film. Next, a polarizing plate (made by Nitto Denko Co., Ltd.) made of an acrylic plate having a thickness of 1.0 mm and having an iodine is adsorbed and oriented on a polyvinyl alcohol resin having a thickness of 0.2 mm on the surface of an optically isotropic transparent protective plate HEG1425DU) is pasted, and the decorative film is pasted on the surface of the polarizing plate with a transparent double-sided tape so that the window forming layer side is on the back side, while the thickness on the back side of the transparent protective plate. A protective panel for an electronic device display window was obtained by laminating a λ / 4 plate (SEF340138B manufactured by Sumitomo Chemical Co., Ltd.) made of 40 μm polycarbonate resin. In addition, when the orientation axis of the λ / 4 plate and the absorption axis of the polarizing plate are expressed such that the transverse direction is 0 ° and the angle advances counterclockwise, the λ / 4 plate has the orientation axis of 90 °, The polarizing plate 2 has an absorption axis of 45 °. In addition, each bonding is performed entirely using a substrate-less transparent adhesive having a thickness of 25 μm.

  This protective panel was excellent in productivity because a decorative film in which a window forming layer having a transparent window portion was previously formed on the back surface of the hard coat film was laminated on the transparent protective plate surface.

(Example 3)
The same procedure as in Example 2 was performed except that the transparent protective plate was the following touch panel. That is, an ITO film having a thickness of 20 nm was formed on the entire surface of a polycarbonate film having a thickness of 0.1 mm by sputtering, and the peripheral portion of the ITO film was removed to obtain a transparent electrode having a wide rectangular shape. Further, a circuit composed of a bus bar disposed on two sides facing the transparent electrode in the lateral direction and a routing circuit for outputting to the outside from the bus bar was formed by screen printing silver paste. Also, an acrylic plate having the same height and width as the PET film and a thickness of 0.7 mm is bonded to the surface opposite to the surface on which the transparent electrode of the polycarbonate film is formed with a baseless transparent adhesive having a thickness of 25 μm. An electrode plate was obtained. In addition, a polycarbonate film film having the same vertical and horizontal dimensions as the lower electrode plate and having a thickness of 125 μm is formed, and an ITO film having a thickness of 20 nm is formed on the entire surface by sputtering, and the peripheral portion of the ITO film is removed to form a wide rectangular shape. A transparent electrode was formed. Moreover, the upper electrode plate was obtained by screen-printing a silver paste on a circuit composed of a bus bar arranged on two sides facing the vertical direction of the transparent electrode and a routing circuit for outputting to the outside from the bus bar. The upper electrode plate and the lower electrode plate were arranged to face each other so that the electrodes were separated from each other, and bonded together with adhesive paste at the periphery except for the insertion portion of the film connector to obtain a touch panel.

  This protective panel was excellent in productivity because a decorative film in which a window forming layer having a transparent window portion was previously formed on the back surface of the hard coat film was laminated on the transparent protective plate surface.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

  Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.

It is sectional drawing of the protection panel of the electronic device display window which concerns on one Example of this invention, and is the II sectional view taken on the line of FIG. It is sectional drawing of the protection panel of the electronic device display window which concerns on other embodiment of this invention. It is sectional drawing of the protection panel of the electronic device display window which concerns on the further another Example of this invention. It is sectional drawing of the protection panel of the electronic device display window which concerns on the further another Example of this invention. It is sectional drawing of the protection panel of the electronic device display window which concerns on the further another Example of this invention. It is a figure which shows the external appearance structure of the protection panel of the electronic device display window concerning embodiment of this invention. It is a figure which shows the usage example of the protection panel of the electronic device display window concerning embodiment of this invention. It is a figure which shows the manufacturing process of the protection panel of the electronic device display window concerning embodiment of this invention.

Explanation of symbols

1, 1a, 1b Protective panel 2 Decorated part 3 Transparent window part 4 Transparent protective plate 5 Hard coat film 6 Window forming layer 7 Decorated film 8 Polarizing plate 9 λ / 4 plate 10 Adhering layer 11 Second low reflection treatment Layer 12 First low-reflection treatment layer 15 Liquid crystal display device 21 Front casing 22 Display window opening 23 Decorative film 25 Transparent double-sided tape 24 Large transparent protective plate 26 Decorative region

Claims (9)

A protection panel for an electronic device display window fitted in the display window opening for protecting an exposed portion from the display window opening of a display device provided in the display window opening portion of a casing of the electronic device,
A transparent protective plate provided opposite to the exposed portion surface of the display device;
A decorative film having a window forming layer formed as visibly configured transparent window portion exposed portion from the display window opening of the display device,
A transparent adhesive layer for adhering the decorative film in a laminated state to the surface of the transparent protective plate on the side not facing the display device so that the window forming layer is located on the surface side of the transparent protective plate; And
The decorative film is
A transparent hard coat film,
A window forming layer formed in a thin film on one surface of the hard coat film,
In the said window formation layer, while being formed as a decorating part which is provided so that one part may contact the said hard coat film and consists of a colored printing layer and a metal thin film layer expressing a metallic luster color, the said colored printing layer A protective panel for an electronic device display window, wherein a portion where the metal thin film layer is not provided is formed as the transparent window portion . 2. The electronic device display window according to claim 1, wherein the decoration portion is formed of the colored printing layer and provided at a peripheral edge of the decoration film, and the transparent window portion is formed at a central portion of the decoration film. Protection panel.   The protection panel for an electronic device display window according to claim 1, wherein the decorative film is further provided with a first low reflection treatment layer.   The electronic device display window protection panel according to claim 3, wherein the first low reflection treatment layer is provided on the entire other surface of the hard coat film.   The said transparent protective board is an optical isotropy, The protection panel of the electronic device display window of Claim 1 by which the polarizing plate is provided in any surface.   The said polarizing plate is a protection panel of the electronic device display window of Claim 5 provided in the surface of the side which does not oppose the said display apparatus of the said transparent protective plate.   The electronic device display window protective panel according to claim 5, wherein the transparent protective plate is provided with a second low-reflection treatment layer on a surface facing the display device.   The electronic device display window protection panel according to claim 7, wherein the second low reflection treatment layer is formed of a λ / 4 plate.   The transparent protective plate includes a movable electrode film laminated with the decorative film, and a fixed electrode plate bonded to the movable electrode film at a peripheral edge so as to form an air layer between the movable electrode film and The protection panel for an electronic device display window according to any one of claims 1 to 8, comprising a touch panel.

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