JP2013178332A - Decorative scattering prevention film for image display panel, and image display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative scattering prevention film for an image display panel and an image display panel, capable of eliminating a level difference due to decoration on a non-display part of a scattering prevention film and also eliminating a defect occurrence of air bubble inclusion.SOLUTION: A scattering prevention film is adhered on a surface of an image display panel. A position of the scattering prevention film corresponding to an outer frame part of the image display panel is decorated, and further the whole area thereon is coated with a UV resin. Through flushing work to press a film or a glass onto the UV resin, a level difference between a center window part corresponding to a display part and the outer frame part of the image display panel caused by the decoration is eliminated, and after that, the UV resin is cured by ultraviolet irradiation.

Description

  The present invention relates to a decorated anti-scattering film as an image display panel member used for mobile phones, advanced information terminals, car navigation, electronic books, and the like.

  In recent years, portable devices, mobile phones / advanced information terminals / car navigation systems, and electronic books have been reduced in size, weight, and thickness, while displays have been increased in size. In order to protect the display, these displays may be subject to impact and external force, and the glass substrate may be damaged. An anti-scattering film having a touch panel function is pasted on the surface (Patent Document 1).

  The anti-scattering film is for preventing the glass of the image display device from being scattered around when the image display device is damaged. In general, it is composed of a combination of a transparent polyester film having a strong hard-to-break performance and a special adhesive material, and is used by being bonded to a glass substrate of an image display panel. As the image display panel, a liquid crystal display panel, an electroluminescence display panel, an electrophoretic display panel, or the like in which glass is used for a display substrate is used.

  Silk screen printing, pad printing, hot stamping, etc. are known for decorating anti-scattering films, and a method that has been characterized by the thickness of the ink has been developed, creating unique new values.

  Image display panels used in mobile phones, advanced information terminals, car navigation systems, etc. have anti-scattering films attached to them. The thickness is about several to 25 μm (1 to 6 layers).

  FIG. 4 shows a cross section of a typical decorated anti-scattering film. Functional layers such as a hydrophilic hard coat layer, a diffusion layer, an antifouling layer, a low reflection layer, and an antireflection layer are provided on one surface of the image display panel substrate and the surface that is exposed after being applied to the image display display panel. , A protective film is stuck on it. On the other hand, decoration by silk screen printing etc. is given to the outer frame part 2 of the center window part (display part) 1 of the surface affixed on an image display panel.

  The design of the anti-scattering film is mainly printing on the outer frame portion 2, and the silk screen printing ink for decoration as described above has a thickness, so the central window portion 1 and the outer frame portion In the pasting process using an adhesive to the display surface, which is the next process, a defect occurs in which bubbles are trapped in the stepped part between the central window part 1 and the outer frame part 2, and the yield is increased. It is getting worse.

JP 2007-12054 A

The present invention has been made in view of the above circumstances, and to the outer frame portion of the anti-scattering film to be used in response to the increase in the size of displays installed in portable devices and the increasing demand for design. An object of the present invention is to provide a decorative anti-scattering film for an image display panel and an image display panel that can eliminate the level difference caused by the decoration of the liquid crystal and can eliminate the occurrence of defects that are embraced by bubbles.

  As means for solving the above-mentioned problems, the invention according to claim 1 is an anti-scattering film for an image display panel that is affixed to the surface of the image display panel, and the outer frame portion of the image display panel of the anti-scattering film. Is applied to the entire surface of the decorated anti-scattering film, and the film or glass is pressed against the UV-curable resin to prevent scattering caused by the decoration. It is a decorative anti-scattering film for an image display panel, which is formed by curing a UV curable resin by UV irradiation after eliminating a step between the central window portion of the film and the decoration.

  In addition, the invention according to claim 2 is provided with a hydrophilic hard coat layer, a diffusion layer, a protective layer on the surface facing the surface on which the decorative scattering prevention film for image display panel according to claim 1 is decorated. A decorative scattering prevention film for an image display panel, wherein any one of a dirty layer, a low reflection layer, and an antireflection layer is provided.

  The invention described in claim 3 uses the decorative scattering prevention film for an image display panel according to claim 1 or 2 on the surface of the image display panel using an optically transparent adhesive (OCA). It is the image display panel characterized by sticking.

  In the invention according to claim 4, decoration is applied to a position corresponding to the outer frame portion of the image display panel, an ultraviolet curable resin is applied to the entire surface of the decorated image display panel, and the film is further pressed. The leveling between the central window corresponding to the display part of the image display panel and the decoration, which is caused by the decoration, is eliminated by flushing, the ultraviolet curable resin is cured by ultraviolet irradiation, and then a scattering prevention film is formed. An image display panel, which is pasted using an optically transparent adhesive (OCA).

  Decorate the position of the anti-scattering film corresponding to the outer frame part of the image display panel, flush the surface with UV curable resin, UV irradiation, the level difference between the central window part and the outer frame part caused by the decoration By eliminating, the defect by the inclusion of the bubble which generate | occur | produces in a level | step difference is lose | eliminated, and the decoration scattering prevention film for image display panels with a high yield can be provided.

It is the conceptual diagram which showed the cross section of the decorative scattering prevention film for image display panels which performed the flush process of this invention. It is the cross-sectional conceptual diagram which showed the state which bonded together the decorative scattering prevention film for image display panels which performed the flush process of this invention into two layers. A center window portion corresponding to a display portion of the image display panel and the outer frame portion, which is generated by the decoration by applying decoration to the outer frame of the image display panel of the present invention and pressing the anti-scattering film. It is the cross-sectional conceptual diagram which showed the state which eliminated the level | step difference. It is the conceptual diagram which showed the cross section of the general decorated anti-scattering film.

CA11 shows the decorative shatterproof film 100 bonded to the image display panel base material 4. A hard coat layer 8 is coated on the opposite surface of the decorated shatterproof film 12, and a protective film 9 is further attached. FIG. 1 shows a thickness more than the thickness of the mirror print layer 5 and the ink layer 6 similarly OF THE iSeries, the form for implementing the decorating scattering prevention film for image display panels of this invention is demonstrated in detail using drawing. FIG. applied for decoration on the outer frame portion 2 around the central window portion 1 which is the display portion of the image display film of the present invention. After the UV resin 10 is applied to the surface and processed flush, O is an accurately transparent adhesive ..
The decorative scattering prevention film 100 bonded to the image display panel base material 4 by CA11 is shown. On the opposite surface of the anti-scattering film 12 that has been decorated, a hard coat layer 8 is coated, and a protective film 9 is further bonded.

At this time, as shown in FIG. 2, the decorative anti-scattering film having flexibility and depth can be obtained by eliminating the step by laminating the decorated anti-scattering film into two layers. Can do.

  In FIG. 3, the image display panel substrate 4 is decorated instead of the scattering prevention film, and the UV resin 10 is applied to a thickness equal to or larger than the thickness of the ink layer 6 applied for the decoration, and the surface processing is performed. An image display panel 101 that is bonded to the scattering prevention film 12 later using OCA 11 that is an optically transparent adhesive is shown.

  The decorative scattering prevention film for an image display panel of the present invention is assumed to be a panel such as a touch panel, and the decoration is subjected to silk printing or the like in order to improve the concealability. In order to ensure high brightness, mirror printing is used to remove logos or print directly on the panel bonding surface side of the anti-scattering film (sheet) itself.

  Next, an OCA layer is formed. A thin film layer is applied to the surface layer, and a film having a hard coat layer of 2H to 6H is bonded to the surface.

  As the OCR, a standard grade of a highly transparent adhesive transfer tape, a high heat resistant grade (OPC tape: manufactured by Sumitomo 3M), and an adhesive film for optical materials (Panaclean: manufactured by Panac) can be used. The transmittance is 99% or more and 93.2%, the haze is 1% or less and 0.4%, the thickness is 25 to 100 μm, 25 μm, and 25 μm is preferable.

  In addition to the hard coat layer 8, a diffusion layer, an antifouling layer, a low reflection layer, and an antireflection layer may be provided depending on the purpose. Further, the hard coat layer 8 may be hydrophilic.

  As the diffusion layer, the total haze is 3 to 40%, preferably 5 to 30%, and the external haze is 2.5% or more, preferably 2.5 to 30%. If the haze is too high, the definition of the displayed image is lost. If it is too low, it becomes difficult to obtain a desired diffusion function.

  The diffusion layer can be a resin cured by ionizing radiation or ultraviolet irradiation, or a resin polymerized by mixing a thermosetting monomer alone, or in particular, UV-curable acrylic esters, acrylamides, methacrylic esters, methacrylic esters. Acrylic resins such as amides, organic silica resins, thermosetting polysiloxane resins, and the like are suitable.

  As monomers used for the acrylic resin, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol (meth) acrylate, ethylene glycol di (meth) acrylate, Triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, 3-methylpentanediol di (meth) acrylate, diethylene glycol bis β- (meth) acryloyloxypropio Nate, trimethylolethane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate , Tri (2-hydroxyethyl) isocyanate di (meth) acrylate, pentaerythritol tetra (meth) acrylate, 2,3-bis (meth) acryloyloxyethyloxymethyl [2.2.1] heptane, poly 1, 2-butadiene di (meth) acrylate, 1,2-bis (meth) acryloyloxymethylhexane, nonaethylene glycol di (meth) acrylate, tetradecane ethylene glycol di (meth) acrylate, 10-decanediol (meth) acrylate, 3 , 8-bis (meth) acryloyloxymethyltricyclo [5.2.10] decane, hydrogenated bisphenol A di (meth) acrylate, 2,2-bis (4- (meth) acryloyloxydiethoxyphenyl) propane, 1,4-bis ((meth) a (Chloroyloxymethyl) cyclohexane, hydroxypivalate ester neopentyl glycol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, epoxy-modified bisphenol A di (meth) acrylate and the like. These may be used alone or in combination of two or more.

  As the organic silica-based resin, a method in which an alkoxysilane compound is partially or completely hydrolyzed using an inorganic acid such as hydrochloric acid or sulfuric acid, or an organic acid such as oxalic acid or acetic acid, and polycondensed is preferably used. Examples of these alkoxysilane compounds include tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrapentaethoxysilane, tetrapentaisoproxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, and methyltributoxy. Examples include silane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethylethoxysilane, dimethylmethoxysilane, dimethylpropoxysilane, dimethylbutoxysilane, methyldimethoxysilane, methyldiethoxysilane, and hexyltrimethoxysilane. These may be used alone or in combination of two or more.

  The antifouling layer has a function of facilitating wiping off water droplets and fingerprints on the surface and preventing external damage such as scratches caused by impacts on the surface. Any material may be used as long as it has friction, and examples thereof include silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon compound, and perfluoropolyether group-containing silane coupling agent.

The antifouling layer can be formed by a wet process such as a microgravure method, a screen coating method, or a dip coating method in addition to a vacuum dry process such as an evaporation method, a sputtering method, a CVD method, or a plasma polymerization method. The physical film thickness of the antifouling layer is suitably about 5 to 10 nm.

  The low reflection layer and the antireflection layer exhibit functions by sequentially laminating a high refractive index layer and a low refractive index layer with a predetermined film thickness. The number of laminated layers of the low reflection layer and the antireflection layer is different. In order to keep the reflectance lower than that of the antireflective film having a single layer constitution of the low refractive index material and to suppress the coloring of the antireflective film itself, the refractive index at 550 nm of the high refractive index material layer is 1.90 to 2.30. The refractive index at 550 nm of the low refractive index material layer is preferably in the range of 1.38 to 1.40. The thickness of the high refractive index material layer is in the range of 10 to 30 nm, and the thickness of the low refractive index material layer is in the range of 120 to 140 nm, preferably in the range of 120 to 135 nm.

  Materials for forming the high refractive index material layer include indium oxide, tin oxide, zinc oxide, niobium oxide, titanium oxide, aluminum-zinc oxide alloy (AZO), gallium-zinc oxide alloy (GZO), indium oxide-tin oxide. An alloy (ITO), indium oxide-cerium oxide (ICO), or a mixture thereof is preferred.

  The high refractive index material layer preferably has a conductive material, such as indium oxide, tin oxide, zinc oxide, aluminum-zinc oxide alloy (AZO), gallium-zinc oxide alloy (GZO), indium oxide-tin oxide. By using an alloy (ITO), indium oxide-cerium oxide (ICO), or a mixture thereof, an antistatic function or the like can be imparted to the antireflection film.

  The film thickness of the high refractive index material layer is preferably in the range of 10 to 30 nm, and if it is thinner than this, the antireflection function is lowered and it is difficult to obtain the desired antireflection performance. Moreover, when it becomes thicker than this, it will become easy to produce coloring to a film.

  The material for forming the low refractive index material layer is characterized by comprising magnesium fluoride or a substance containing an inorganic transparent oxide material such as silicon oxide in magnesium fluoride.

  The film thickness of the low refractive index material layer is preferably in the range of 120 to 140 nm, more preferably in the range of 120 to 135 nm. If it is thinner than about 110 nm, the reflectance when facing directly at an incident angle of 0 ° decreases, but the reflectance increases sharply as the incident angle increases, and the reflection spectrum shifts to the red side. It is not liked by the observer, and it is difficult to see in appearance. Further, if it is thicker than 150 nm, a desired low reflectance cannot be obtained, and further, the reflected color when facing directly at an incident angle of 0 ° becomes extremely blue.

<Embodiment>
A fluorine-based material (trade name: KP801M, manufactured by Shin-Etsu Chemical Co., Ltd., product name: KP801M) is applied to the surface of a 125 μm-thick anti-scattering film 12 (PET base material) by resistance heating vacuum deposition, and AFP (Anti Finger) (Prin) was applied to form an antifouling layer, and a protective film 9 was provided.

  On the surface opposite to the antifouling layer treatment surface, mirror ink for screen printing (MIR-41000 Mirror Silver manufactured by Teikoku Ink Manufacturing Co., Ltd.) is used, and a 5-7 μm mirror printing layer 5 is provided in a pattern, and further 6-8 μm. A screen printing ink layer was laminated for decoration.

  Further, the entire surface of the central window portion 1 and the outer frame portion 2 of the decorated anti-scattering film 12 is coated with a polyurethane-based ultraviolet curable mold, and a glass substrate or a film base material that is a transparent base material is placed thereon to apply pressure. In addition, it was cured by irradiating with ultraviolet rays from the glass side.

  The mirror printing layer 8 and the ink layer 6 were laminated | stacked on the outer frame part 2, and the thickness of the part which gave the decoration was measured. The average value of n− = 3 was 153 μm. On the other hand, the difference in level was 110 μm after the surface processing, and an improvement was observed.

Each decorated anti-scattering film 12 was bonded to the image display substrate 4 using OCA 11 to produce a liquid crystal display panel 101. At this time, when looking at the air embracing defect (0.05 mm or more), the defect rate was 60% before performing the flushing process, but it was improved to 30% by performing the flushing process. It was.

2 ... Outer frame part 3 ... Mirror character 4 ... Image display panel base material 5 ... Mirror printing layer 6 ... Ink layer 7 ... Adhesive layer 8 ... Hard coat layer 9 ...・ ・ Protective film 10 ・ ・ ・ UV curable resin 11 ・ ・ ・ OCA
12 ... Scattering prevention film 13 ... Surface adhesive layer 100 ... Decorative shatterproof film 101 ... Liquid crystal display panel 1 ... Central window (display)
2 ... Outer frame part 3 ... Mirror character 4 ... Image display panel substrate 5 ... Mirror print layer 6 ... Ink layer 7 ... Adhesive layer 8 ... Hard coat layer 9 .. Protective film 10 ... UV curable resin 11 ... OCA
12 ... scattering prevention film 13 ... flush adhesive layer 100 ... decorative scattering prevention film 101 ... liquid crystal display panel

Claims (4)

1.   An anti-scattering film for an image display panel to be attached to the surface of the image display panel, wherein the anti-scattering film is decorated at a position corresponding to the outer frame portion of the image display panel, and the entire surface of the decorated anti-scattering film After applying a UV curable resin to the surface and pressing the film or glass against the UV curable resin to remove the step between the central window portion and the decoration of the anti-scattering film caused by the decoration, UV irradiation is performed. A decorative scattering prevention film for an image display panel, which is formed by curing an ultraviolet curable resin.
2.   A hydrophilic hard coat layer, a diffusion layer, an antifouling layer, a low reflection layer, an antireflection layer are provided on the surface opposite to the surface on which the decorative scattering prevention film for an image display panel according to claim 1 is decorated. A decorative scattering prevention film for an image display panel, wherein any one of the layers is provided.
3.   An image display panel, wherein the decorative scattering prevention film for an image display panel according to claim 1 or 2 is attached to the surface of the image display panel using an optically transparent adhesive (OCA).
4.   By applying decoration to the position corresponding to the outer frame part of the image display panel, applying UV curable resin to the entire surface of the decorated image display panel, and further by applying a film or glass to the surface, The step between the center window portion corresponding to the display portion of the image display panel and the decoration is eliminated, and the ultraviolet curable resin is cured by ultraviolet irradiation, and then the scattering prevention film is optically transparent adhesive (OCA). An image display panel characterized by being attached using