KR20160140208A - Anti-reflection film, and polarizing plate and display device including the same - Google Patents

Abstract

An anti-reflection film, a polarizing plate and a display device including the same of the present invention improve reflective visibility by processing a surface by including coloring matter within an anti-reflection layer, or change a color of a screen into a desired color. Thereby, the present invention can manufacture the anti-reflection film having a simple structure and an excellent anti-reflection effect. The anti-reflection film can be used for the polarizing plate and the display device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antireflection film,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an antireflection film, and more particularly, to an antireflection film that improves reflectivity and a polarizing plate and a display device.

In recent information society, the importance of display device as a visual information delivery medium is further emphasized, and research and commercialization of various display devices are focused on.

The display device can be divided into a light-emitting type in which the device itself emits light and a non-light-emitting type in which light can not be emitted. Emission type includes a cathode ray tube (CRT), an electroluminescence (EL), a light emitting diode (LED), a vacuum fluorescent display (VFD), a field emission display A display (FED), a plasma display panel (PDP), and the like. The non-light emitting type includes a liquid crystal display (LCD).

In such a display device, there is a problem that the image quality is deteriorated due to glare caused by reflected light and reflection on the entire surface of the panel.

Various anti-reflection films have been developed to solve these problems. An anti-glare film using the diffuse reflection of light is attached to the front of the display device, or an anti-reflection film using the destructive interference of light is attached Method is being used.

In addition, as the size of the panel increases and various types of display devices are developed, various additional functions such as outdoor visibility, anti soil treatment, and hardness are required in addition to the antireflection function on the surface.

However, some antireflection films having a multi-layer structure are subjected to a large number of coating processes, resulting in a low productivity and a problem of increase in unit cost. Particularly, in order to popularize a large-sized panel, it is essential to develop an antireflection film having a simple structure because price reduction of a display device is essential.

An object of the present invention is to provide an antireflection film which is improved in reflectivity, a polarizing plate having the same, and a display device.

Another object of the present invention is to provide an antireflection film capable of changing the color of a screen to a desired color, a polarizing plate having the same, and a display device.

Other objects and features of the present invention will be described in the following description of the invention and the claims.

In order to achieve the above-mentioned object, the antireflection film of the present invention is comprised of a low refraction layer provided on a substrate, and the low refraction layer is composed of a low refraction bead and a pigment in the resin.

Alternatively, the antireflection film of the present invention is comprised of a low refractive layer provided on a substrate, and the low refractive layer is composed of a low refractive bead and a color bead in the resin.

At this time, the base material may have a larger refractive index than the low refractive layer.

At this time, a high refractive index layer interposed between the substrate and the low refraction layer and having a refractive index larger than that of the low refraction layer may be further included.

The dye may be chemically bonded to the low refractive bead through the binder.

The color beads may be filled with pigment in the hollow portion.

And the density and diameter of the low refractive index beads and the color beads become larger toward the upper portion from the lower portion of the low refraction layer.

The polarizing plate of the present invention is characterized by having the above-described low refraction layer on a polarizing base.

The display device of the present invention is characterized in that the above-mentioned low refraction layer is provided on an upper layer of a polarizing plate.

INDUSTRIAL APPLICABILITY As described above, the antireflection film according to the present invention, the polarizing plate having the antireflection film, and the display device have a simple structure and provide an effect of producing an antireflection film having an excellent antireflection effect. Such an antireflection film can be usefully used for polarizing plates and display devices.

In addition, the anti-reflection film, the polarizing plate and the display device according to the present invention can realize a color that is difficult to be realized by the conventional display device, and can improve the reflection feeling of the panel and change the color of the screen to provide.

1 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a first embodiment of the present invention.
2 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a second embodiment of the present invention.
3 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a third embodiment of the present invention.
4 is a perspective view schematically showing the structure of a polarizing plate according to the first embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of the polarizer according to the first embodiment of the present invention shown in FIG. 4, taken along line I-I '.
6 is a cross-sectional view schematically showing a structure of a polarizing plate according to a second embodiment of the present invention.
7 is a cross-sectional view schematically showing a structure of a liquid crystal display device according to an embodiment of the present invention.
8A and 8B are cross-sectional views schematically showing the structure of an organic light emitting display device and a display panel according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the antireflection film, the polarizing plate having the same, and the display device according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention .

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

The antireflection film has a wide range of applications because it imparts additional functions such as abrasion resistance and stain resistance as well as antireflection effect.

The present invention relates to a low-reflectivity surface treatment for improving the contrast ratio and reflection feeling in the external illuminance as the importance of the reflection illuminance is emphasized and the demand for improvement is increased.

1 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a first embodiment of the present invention.

Referring to FIG. 1, the anti-reflection film according to the first embodiment of the present invention may include a transparent substrate 110 and an anti-reflection layer disposed thereon.

The anti-reflection layer may include a high refractive index layer 120 and a low refractive index layer 130.

The high refractive index layer 120 and the low refractive index layer 130 may be sequentially positioned on the transparent substrate 110.

The antireflection film according to the first embodiment of the present invention may have a multilayer structure in which the high refractive index layer 120 and the low refractive index layer 130 are alternately laminated to obtain a more excellent antireflection effect.

The transparent substrate 110 is not particularly limited, but a transparent resin film, a transparent resin sheet, a transparent resin plate, a transparent glass, or the like can be used. As the resin material forming the transparent substrate 110, for example, a resin such as a poly (meth) acrylic resin, a poly (meth) acrylonitrile resin, a polystyrene resin, a polysulfone resin, a polyether sulfone resin, Styrene-butadiene terpolymer resins, polycarbonate resins, polyether ketone resins, polyvinyl chloride resins, polyvinylidene chloride resins, polyvinyl alcohol-based resins, A resin, a nylon resin, a polyethylene resin, a polypropylene resin, a polyamide resin, a polyimide resin, a norbornene resin and the like.

The thickness of the transparent substrate 110 is not particularly limited, but is preferably 10 to 5000 占 퐉.

As described above, the antireflection layer is disposed on the transparent substrate 110.

The anti-reflection layer may include a high refractive index layer 120 and a low refractive index layer 130. However, the present invention is not limited thereto. When the transparent substrate 110 itself is made of a high refractive index material having a refractive index larger than that of the low refractive index layer 130, the low refractive index layer 130 is formed directly on the transparent substrate 110 It may be located.

The high refractive index layer 120 may be formed of a conventional hard coat film or an anti-glare film. The antiglare film disperses the light and reduces the incidence of light reflected from the reflector into the eye.

The low refraction layer 130 according to the first embodiment of the present invention includes a low refractive bead 132 for lowering the refractive index to enhance the antireflection characteristic and the low refraction bead 132 is formed in the resin 131, And a coating composition for forming an antireflective layer.

The low refraction layer 130 according to the first embodiment of the present invention is characterized in that it further includes a coloring material 133 for improving the reflection feeling or for changing the color of the screen to a desired color.

The low refractive beads 132 and the coloring matter 133 may be randomly arranged in the resin 131, but the present invention is not limited thereto.

As the resin 131, a transparent resin commonly used can be used. However, the present invention is not limited thereto, and a translucent or opaque resin may be used in some cases. For example, one or more of ultraviolet curable resin, thermosetting resin, thermoplastic resin and the like may be mixed and used as the resin.

The ultraviolet curable resin is not particularly limited, but one containing at least one reactive (polymerizable, non-polymerizable) oligomer or at least one reactive monomer (monofunctional, polyfunctional) can be used.

The reactive oligomer may have a substitution structure such as an unsaturated group such as an acrylic group, a methacrylic group, an aryl group, and a vinyl group, and an epoxy group as a reactive functional group. These may be used individually or in combination of two or more.

The reactive monomer includes, but is not limited to, ethylhexyl (meth) acrylate, oxydecyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2- (Meth) acrylate, isobornyl (meth) acrylate, tetrahydrofuran (meth) acrylate, cyclohexyl (meth) acrylate, dicyclo (Meth) acrylate, dicyclopenthenoxymethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 1,4-butanediol di Acrylate, neopentyl glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, neopentyl glycol (Meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone-modified dicyclopentenyl (meth) acrylate, ethylene oxide modified (meth) acrylate, Acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid (meth) acrylate, (Meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipenta (meth) acrylate, dipentaerythritol hexa Erythritol hexa (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (metha) Relays, and the like. These may also be used individually or in combination of two or more.

Examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea co- , Polysiloxane resin, etc. may be used alone or in combination.

As the thermoplastic resin, for example, one or more thermoplastic resins such as urethane, polyester, acrylic, butyral, cellulose and vinyl resins may be used.

As the low-refractive material, fluorine and silicon-containing compounds may be contained in addition to the above-mentioned polymer resin. That is, one of a fluorine-containing compound, a silicon-containing compound, and a fluorine-silicon-containing compound.

The low refractive beads 132 may be composed of organic particles or inorganic particles.

Examples of the organic filler include styrene beads, acrylic beads, acryl-styrene beads, melamine beads, polycarbonate beads, polyethylene beads, and salt beads. Also, it the inorganic particles can be used for a conventional inorganic fillers, as an example of the inorganic filler is _{SiO 2, Al-SiO, TiO} 2, ZrO 2, Al 2 O 3, In 2 O 3, SnO 2, ITO , etc. have. In addition to the above-mentioned silica particles as the inorganic particles, nanosilica particles, conductive particles, nano-conductor particles, polymer particles, glass particles and the like can be included.

For example, the hollow silica as the inorganic filler preferably has a refractive index of 1.20 to 1.40 at room temperature. If the refractive index of the hollow silica at room temperature is less than 1.20, the strength of the hollow silica may be weakened and the scratch resistance of the antireflection film may be deteriorated. When the refractive index is larger than 1.40, Here, the refractive index does not mean the refractive index of the silica 132a, that is, the refractive index of the outer periphery forming the hollow particles, but the refractive index of the whole particle.

The hollow silica preferably has a particle size of 10 to 150 nm. When the particle size of the hollow silica is smaller than 10 nm, the hollow portion 132b in the silica 132a is too small to exhibit a sufficient low refractive effect, and when it is larger than 150 nm, whitening due to scattering is apt to occur.

Silica-based silica beads can be used without limitation as any of those used as a light diffusing agent. For example, microemulsion method, sol-gel method using tetraethylorthosilicate (TEOS) (W. Stober et al., J. colloid and Interface Science, 26, 62-69 (1968), spray drying or It is possible to use silica beads prepared by spray pyrolysis.

The volume of the hollow portion 132b in the silica bead is preferably 20 to 80% of the total volume of the silica 132a including the hollow portion 132b. When the volume ratio of the hollow silica is less than 20%, the refractive index is not lowered so much that the antireflection effect can not be obtained. When the volume ratio exceeds 80%, the strength of the hollow silica may be weakened.

The dye 133 is a colored compound and can be roughly classified into a pigment and a dye. That is, the coloring matter 133 is determined depending on whether the pigment, the dye, or the particles of these materials selectively reflect or transmit a certain wavelength portion of visible light (300 to 700 nm).

In general, a dye used in a state dissolved in a solvent is referred to as a pigment in which it is dispersed in a solvent and used in a particle state. That is, when the dye 133 is easily adsorbed or bonded to another substance, it is called a dye.

In the state of being dissolved in a solvent, the size of the dye molecules is about 1 to 3 탆, and the size of the pigment particles is about 50 to 1000 탆.

Dyes are not good in light fastness and are easily changed in color by light, while pigments are excellent in light fastness.

The coating composition for forming an antireflective layer according to the first embodiment of the present invention may be used without limitation as long as it includes the low refractive index beads 132 and the pigment 133. For example, the coating composition for forming an antireflective layer may further include a photopolymerizable compound, a photoinitiator, and a solvent in addition to the low refractive index beads 132 and the pigment 133. However, the present invention is not limited thereto.

The photopolymerizable compound is used for curing and may be used without limitation as long as the compound can be polymerized by the photoinitiator described later.

If necessary, the photopolymerizable compound may be a (meth) acrylate of an organic-inorganic hybrid type in which the surface of the metal oxide is substituted with (meth) acrylate. The metal oxide is not particularly limited and can be easily used if it has a hydroxyl group on its surface.

The photoinitiator may be used without limitation as long as it is used in the art.

For example, the photoinitiator may be selected from the group consisting of 2-methyl-1- [4- (methylthio) phenyl] 2- morpholinopropanone-1, diphenyl ketone benzyl dimethyl ketal, 2- 1-one, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylacetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, Dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone, and the like. The exemplified photoinitiators may be used alone or in combination of two or more thereof.

The photoinitiator may be a benzophenone-based hydrogen recycle type photoinitiator. Examples of the benzophenone-based hydrogen recycling type photoinitiator include benzophenone, 2,4,6-trimethylbenzophenone, 4-methylbenzophenone, 4- (4-methylphenylthio) phenylmethanone, 3,3'- 2-benzoyl benzoate, 4-phenyl-benzophenone, 4,4'-bis (dimerylamino) -benzophenone, and the like. These may be used alone or in combination of two or more.

When a benzophenone based hydrogen recycle type photo initiator is used as a photo initiator, a photosensitizer may be used together with a photo initiator in order to suppress the volatility and the oxygen problem occurring in the photopolymerization process as much as possible.

For example, the photosensitizer may be amine (meth) acrylate or triethylamine, diethylamine, methyldiethanolamine, ethanolamine, isoamyl 4-dimethylaminobenzoate and the like. These may be used alone or in combination of two or more.

The solvent may be used without limitation as long as it is used in the art.

For example, the solvent may be selected from the group consisting of alcohol (methanol, ethanol, isopropanol, butanol, methylcellulose, ethylsulosorb, etc.), ketone (methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, Ketene, cyclohexanone, etc.), hexane (hexane, heptane, octane etc.), benzene (benzene, toluene, xylene and the like). Each of the illustrated solvents may be used alone or in combination of two or more thereof.

The low refraction layer 130 according to the first embodiment of the present invention is formed by coating a coating composition for forming an antireflection layer in which a resin 131 is mixed with a low refractive index bead 132 and a dye 133 on a high refractive index layer 120 By coating and forming, it is possible to improve reflection feeling by controlling transmission and reflection colors.

At this time, the mixing ratio and the ratio of the solvent and the dispersing agent can be adjusted so that the dye 133 is uniformly dispersed in the resin 131.

However, the present invention is not limited to the first embodiment of the present invention described above, and it is also possible to form color beads by injecting a dye into the low refractive beads, or to chemically bond the low refractive beads and the pigments.

2 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a second embodiment of the present invention. In this case, the anti-reflection film according to the second embodiment of the present invention shown in FIG. 2 has a structure substantially identical to that of the first embodiment of the present invention, except that the color beads are formed by injecting dye into the low- same.

Referring to FIG. 2, the anti-reflection film according to the second embodiment of the present invention may include a transparent substrate 210 and an anti-reflection layer disposed thereon.

The antireflection layer may include a high refractive index layer 220 and a low refractive index layer 230.

The high refractive index layer 220 and the low refractive index layer 230 may be sequentially disposed on the transparent substrate 210.

The antireflection film according to the second embodiment of the present invention may have a multi-layer structure in which a high refractive index layer 220 and a low refractive index layer 230 are alternately stacked to obtain a more excellent antireflection effect.

The transparent substrate 210 is not particularly limited, but a transparent resin film, a transparent resin sheet, a transparent resin plate, a transparent glass, or the like can be used.

As described above, when the transparent substrate 210 itself is made of a high refractive index material having a refractive index larger than that of the low refractive index layer 230, the low refractive index layer 230 may be directly disposed on the transparent substrate 210.

The low refraction layer 230 according to the second embodiment of the present invention includes the low refraction beads 232 to lower the refractive index to improve the anti-reflection property.

Further, the low refraction layer 230 according to the second embodiment of the present invention may further include a color bead 233 for improving the reflection feeling or changing the color of the screen to a desired color.

This is formed by using a coating composition for forming an antireflection layer including a low-refractive-index bead 232 and a color bead 233 in a resin 231. [

As the resin 231, a transparent resin commonly used can be used. However, the present invention is not limited thereto, and a translucent or opaque resin may be used in some cases. For example, one or more of ultraviolet curable resin, thermosetting resin, thermoplastic resin and the like may be mixed and used as the resin.

As the low-refractive material, fluorine and silicon-containing compounds may be contained in addition to the above-mentioned polymer resin. That is, one of a fluorine-containing compound, a silicon-containing compound, and a fluorine-silicon-containing compound.

The low refractive beads 232 may be composed of organic particles or inorganic particles.

In addition to the above-mentioned silica particles as the inorganic particles, nanosilica particles, conductive particles, nano-conductor particles, polymer particles, glass particles and the like can be included.

When hollow silica is used as the low refractive beads 232, the low refractive beads 232 may be composed of the hollow portion 232b and the silica 232a located at the periphery thereof.

The color beads 233 can be fabricated in the form of a dye 233b injected into the beads 233a of the organic or inorganic particles, that is, the hollow portion, and the refractive index can be maintained at about 1.37 to maintain the low refractive index. The refractive index of the color beads 233 can be adjusted not only by the refractive index of the dye 233b but also by the size and volume ratio of the hollow portion into which the dye 233b is injected.

The low refractive beads 232 and the color beads 233 may be randomly arranged in the resin 231, but the present invention is not limited thereto. The low refractive index beads 232 and the color beads 233 may be arranged in a direction in which the density becomes smaller or a density becomes higher toward the upper part by adjusting the density. For example, when the refractive indexes of the low refractive index beads 232 and the color beads 233 are smaller than the resin 231, the low refractive index beads 232 and the color beads 233 The relative refractive index is gradually lowered so as to be close to the refractive index of the air layer on the surface, and the reflectance can be effectively reduced.

Further, the low-refractive-index beads 232 and the color beads 233 may be arranged in a direction in which the diameters become smaller or smaller toward the upper side by controlling the diameter.

The coating composition for forming an antireflective layer according to the second embodiment of the present invention may be used without limitation as long as it includes the low refractive index beads 232 and the color beads 233. [ For example, the coating composition for forming an antireflective layer may further comprise a photopolymerizable compound, a photoinitiator and a solvent as described above in addition to the low refractive index beads 232 and the color beads 233. [ However, the present invention is not limited thereto.

3 is a cross-sectional view schematically showing the structure of an anti-reflection film according to a third embodiment of the present invention. The anti-reflection film according to the third embodiment of the present invention shown in FIG. 3 is substantially the same as that of the first embodiment of the present invention except that the low refractive index bead and the dye are chemically bonded.

Referring to FIG. 3, the anti-reflection film according to the third embodiment of the present invention may include a transparent substrate 310 and an anti-reflection layer disposed thereon.

The antireflection layer may include a high refractive index layer 320 and a low refractive index layer 330.

The high refractive index layer 320 and the low refractive index layer 330 may be sequentially disposed on the transparent substrate 310.

The anti-reflection film according to the third embodiment of the present invention may have a multi-layer structure in which the high refractive index layer 320 and the low refractive index layer 330 are alternately stacked to obtain a more excellent anti-reflection effect.

The transparent substrate 310 is not particularly limited, but a transparent resin film, a transparent resin sheet, a transparent resin plate, a transparent glass, or the like can be used.

As described above, when the transparent substrate 310 itself is made of a high refractive index material having a refractive index larger than that of the low refractive index layer 330, the low refractive index layer 330 may be directly disposed on the transparent substrate 310.

The low refraction layer 330 according to the third exemplary embodiment of the present invention includes a low refraction bead 332 to lower the refractive index to enhance the antireflection property.

Further, the low refraction layer 330 according to the third embodiment of the present invention may further include a coloring material 333 for improving the reflection feeling or changing the color of the screen to a desired color. At this time, the dye 333 can be chemically bonded to the low refractive bead 332 using a highly reactive organic or inorganic binder.

The chemically bonded low refractive beads 332 and the pigment 333 are mixed in the resin 231 to constitute a coating composition for forming an antireflection layer.

As the resin 331, a transparent resin which is generally used can be used. However, the present invention is not limited thereto, and a translucent or opaque resin may be used in some cases. For example, one or more of ultraviolet curable resin, thermosetting resin, thermoplastic resin and the like may be mixed and used as the resin.

As the low-refractive material, fluorine and silicon-containing compounds may be contained in addition to the above-mentioned polymer resin. That is, one of a fluorine-containing compound, a silicon-containing compound, and a fluorine-silicon-containing compound.

The low refractive bead 332 may be composed of organic particles or inorganic particles.

In addition to the above-mentioned silica particles as the inorganic particles, nanosilica particles, conductive particles, nano-conductor particles, polymer particles, glass particles and the like can be included.

When hollow silica is used as the low refractive bead 332, the low refractive bead 332 may be composed of the hollow portion 332b and the silica 332a located at the periphery thereof.

The dye 333 may be classified into a pigment or a dye, and the low refractive beads 332 may be randomly arranged in the resin 331. However, the present invention is not limited thereto.

The coating composition for forming the antireflection layer according to the third embodiment of the present invention may be used without limitation as long as it includes the low refractive index bead 332 and the pigment 333. For example, the coating composition for forming an antireflective layer may further include a photopolymerizable compound, a photoinitiator and a solvent in addition to the low refractive index bead 332 and the pigment 333 described above. However, the present invention is not limited thereto.

The antireflection film of the present invention constituted as described above can be formed on the uppermost layer of the polarizing plate to improve reflection feeling by controlling transmission and reflection colors.

Hereinafter, a polarizing plate having an anti-reflection film according to the present invention will be described in detail.

4 is a perspective view schematically showing the structure of a polarizing plate according to the first embodiment of the present invention. Here, for convenience, FIG. 4 schematically shows the components of the polarizer in a state in which the pressure-sensitive adhesive is omitted.

FIG. 5 is a schematic cross-sectional view of the polarizer according to the first embodiment of the present invention shown in FIG. 4, taken along line I-I '.

4 and 5, the polarizing plate 440 according to the first embodiment of the present invention may include a substrate 441 and protective layers 442a and 442b formed on both sides of the substrate 441 .

The polarizing plate 440 is a general polarizing element that transmits natural light having a vibration surface in 360 degrees forward direction through only light having a vibration surface in a certain direction and absorbs the remaining light to obtain polarized light.

It is general to use an element which divides the light into a polarization component parallel to the polarization component perpendicular to the incident surface using a polarizer having light absorption properties and linearly polarized light and elliptically polarized light are obtained by the polarizer.

In order to achieve this, it is possible to select a suitable material and process it in the form of a film in accordance with the application, thereby achieving uniform polarization and high polarization efficiency.

For example, when a polyvinyl alcohol (PVA) film treated with iodine is used as the polarizing substrate 441, the polarizing plate 441 has excellent transparency, ultraviolet ray absorbing property and durability as well as stability and abrasion resistance against dimensions and deformation A triacetate cellulose (TAC) film may be used as the protective layers 442a and 442b for protecting the PVA film.

The protective film 444a and the release film 444b can be further attached to protect the base material 441 and the protective layers 442a and 442b adhered to each other.

The protective film 444a is attached to the outside of the first protective layer 442a to prevent scratches on the surface of the polarizing plate 440 until the polarizing plate 440 is attached to the final product and the release film 444b is attached to the polarizing plate 440) may be attached to the outside of the second protective layer 442b until it is attached to the final product.

The release film 444b is adhered to the second protective layer 442b by an adhesive 443b and adhered to the surface of the final product on which the release film 444b is removed. On the other hand, the adhesive 443a may not be formed on the first protective layer 442a to which the protective film 444a is attached.

The polarizing plate 440 having such a configuration is attached to the upper and lower surfaces of the panel, for example, the liquid crystal panel, respectively, so that the release surface of the release film 444b is attached.

The low refraction layer 430 according to the present invention is provided outside the first protective layer 442a of the polarizer 440 on which the protective film 444a is removed, do.

At this time, the first passivation layer 442a and the antireflection layer 430 according to the present invention can constitute the antireflection film according to the first to third embodiments.

That is, the low refractive index layer 430 according to the present invention is located on the first protective layer 442a, which is a high refractive index layer, and functions as reflection prevention together with the first protective layer 442a. However, the present invention is not limited thereto, and an anti-reflection film may be formed by further providing a high-refraction layer on the first protective layer 442a.

As described above, the low refractive index layer 430 according to the present invention is formed by using a coating composition for forming an antireflective layer including low refractive index beads in order to lower the refractive index and improve the anti- do.

The low refractive index layer 430 according to the present invention is characterized in that it further includes a coloring matter or a color bead for improving the reflection feeling or changing the color of the screen to a desired color. At this time, the low refractive bead and the pigment can be chemically bonded.

As the resin, a commonly used transparent resin can be used. However, the present invention is not limited thereto, and a translucent or opaque resin may be used in some cases. For example, one or more of ultraviolet curable resin, thermosetting resin, thermoplastic resin and the like may be mixed and used as the resin.

As the low-refractive material, fluorine and silicon-containing compounds may be contained in addition to the above-mentioned polymer resin. That is, one of a fluorine-containing compound, a silicon-containing compound, and a fluorine-silicon-containing compound.

The low refractive bead may be composed of organic particles or inorganic particles.

In addition to the above-mentioned silica particles as the inorganic particles, nanosilica particles, conductive particles, nano-conductor particles, polymer particles, glass particles and the like can be included.

The color beads can be produced in the form of a dye injected into the beads of the organic or inorganic particles, that is, in the hollow portion, and the refractive index can be maintained at about 1.37 to maintain the low refractive index. The refractive index of the color bead can be controlled not only by the refractive index of the dye but also by the size and the volume ratio of the hollow portion into which the dye is injected.

The low refractive beads and the color beads may be randomly arranged in the resin, but the present invention is not limited thereto. The low refractive index beads and the color beads may be arranged in a direction in which the density becomes smaller or a density becomes higher as the density is lowered from the lower part to the upper part. For example, when the refractive index of the low-refractive-index bead and the color bead is smaller than that of the resin, if the low-refractive index bead and the color bead are arranged in such a direction that the density increases from the lower portion toward the upper portion, the relative refractive index gradually decreases The reflectance can be effectively reduced.

Further, by adjusting the diameter, the low refractive index bead and the color bead may be arranged in a direction in which the diameter decreases from the lower portion toward the upper portion or in a direction in which the diameter increases.

6 is a cross-sectional view schematically showing a structure of a polarizing plate according to a second embodiment of the present invention. The polarizing plate according to the second embodiment of the present invention shown in FIG. 6 has the same structure as the polarizing plate according to the first embodiment of the present invention except that a high-refraction layer is further interposed between the first protective layer and the low- Is substantially the same as the structure of the polarizing plate.

Referring to FIG. 6, the polarizing plate 540 according to the second embodiment of the present invention may include a base material 541 and protective layers 542a and 542b formed on both sides of the base material 541.

As described above, for example, a PVA film treated with iodine is used as a polarizing substrate 541, and a TAC film having excellent transparency, ultraviolet ray absorbing property and durability as well as stability and abrasion resistance against dimensions and deformation is protected As the protective layers 542a and 542b.

The protective film 544a and the release film 544b can be further attached to protect the base material 541 and the protective layers 542a and 542b adhered to each other.

The release film 544b is adhered to the second protective layer 542b by an adhesive 543b and attached to the surface of the final product on which the release film 544b is removed. On the other hand, the first protective layer 542a to which the protective film 544a is adhered does not need to be formed with the adhesive 543a.

The polarizing plate 540 having such a configuration is attached to the upper and lower surfaces of the panel, for example, the liquid crystal panel, respectively, so that the release surface of the release film 544b is attached.

The high refractive index layer 520 and the low refractive index layer 530 according to the present invention are formed outside the first protective layer 542a of the polarizing plate 540 on which the protective film 544a is removed, Is provided.

At this time, the high refractive index layer 520 and the low refractive index layer 530 according to the present invention can constitute the antireflection film according to the first to third embodiments.

The high refractive index layer 520 may be formed of a conventional hard coat film or an antiglare film.

The high refractive index layer 520 and the low refractive index layer 530 may be sequentially disposed on the first protective layer 542a.

The polarizing plate 540 according to the second embodiment of the present invention may have a multilayer structure in which a high refractive index layer 520 and a low refractive index layer 530 are alternately stacked to obtain a more excellent antireflection effect.

As described above, the low refractive index layer 530 according to the present invention is formed by using a coating composition for forming an antireflective layer including low refractive index beads in order to lower the refractive index to improve anti-reflection characteristics do.

The low refraction layer 530 according to the present invention is characterized in that it further includes a coloring matter or a color bead for improving the reflection feeling or changing the color of the screen to a desired color. At this time, the low refractive bead and the pigment can be chemically bonded.

As the resin, a commonly used transparent resin can be used. However, the present invention is not limited thereto, and a translucent or opaque resin may be used in some cases. For example, one or more of ultraviolet curable resin, thermosetting resin, thermoplastic resin and the like may be mixed and used as the resin.

As the low-refractive material, fluorine and silicon-containing compounds may be contained in addition to the above-mentioned polymer resin. That is, one of a fluorine-containing compound, a silicon-containing compound, and a fluorine-silicon-containing compound.

The low refractive bead may be composed of organic particles or inorganic particles.

In addition to the above-mentioned silica particles as the inorganic particles, nanosilica particles, conductive particles, nano-conductor particles, polymer particles, glass particles and the like can be included.

The color beads can be produced in the form of a dye injected into the beads of the organic or inorganic particles, that is, in the hollow portion, and the refractive index can be maintained at about 1.37 to maintain the low refractive index. The refractive index of the color bead can be controlled not only by the refractive index of the dye but also by the size and the volume ratio of the hollow portion into which the dye is injected.

The low refractive beads and the color beads may be randomly arranged in the resin, but the present invention is not limited thereto. The low refractive index beads and the color beads may be arranged in a direction in which the density becomes smaller or a density becomes higher as the density is lowered from the lower part to the upper part. For example, when the refractive index of the low-refractive-index bead and the color bead is smaller than that of the resin, if the low-refractive index bead and the color bead are arranged in such a direction that the density increases from the lower portion toward the upper portion, the relative refractive index gradually decreases The reflectance can be effectively reduced.

Further, by adjusting the diameter, the low refractive index bead and the color bead may be arranged in a direction in which the diameter decreases from the lower portion toward the upper portion or in a direction in which the diameter increases.

The polarizing plate of the present invention configured as described above can be formed outside the display device to improve the reflection feeling of the panel or further apply the design to a specific model to change the color of the screen to a desired color.

Hereinafter, a display device having an antireflection film according to the present invention will be described in detail.

The display device according to the present invention includes the above-described antireflection film according to the present invention. For example, the display device may be manufactured by attaching the above-mentioned polarizing plate having the antireflection film attached thereto. Further, the antireflection film of the present invention may be attached to a window of a display device.

The antireflection film of the present invention may be applied to liquid crystal modes such as TN (twisted nematic), STN (super twisted nematic), IPS (in plane switching) or FFS (fringe field switching) It is applicable regardless. It is also applicable to both transmissive, reflective and transflective mode liquid crystal display devices.

7 is a cross-sectional view schematically showing a structure of a liquid crystal display device according to an embodiment of the present invention. 7 illustrates a liquid crystal display device having a color filter-on-TFT (COT) structure in which a color filter is formed on a thin film transistor of a lower array substrate. However, the present invention is not limited thereto no.

7, a liquid crystal display according to an exemplary embodiment of the present invention mainly includes a color filter substrate 606, an array substrate 601, and a column spacer 607, 606 and an array substrate 601. The liquid crystal layer 601 is formed of a liquid crystal layer.

The array substrate 601 has a COT structure in which a color filter 604 is formed together with a thin film transistor. That is, the array substrate 601 includes a plurality of gate lines (not shown) and data lines 602, which are arranged vertically and horizontally to define a plurality of pixel regions, and switching elements formed in the intersections of the gate lines and the data lines 602 A common electrode 605 formed in the thin film transistor and the pixel region, and a pixel electrode (not shown).

Though not shown, the thin film transistor is composed of a gate electrode connected to the gate line, a source electrode connected to the data line 602, and a drain electrode electrically connected to the pixel electrode through a contact hole formed in the protective film 603a. The thin film transistor includes a gate insulating film for insulation between the gate electrode and the source / drain electrode, and an active layer for forming a conduction channel between the source electrode and the drain electrode by a gate voltage supplied to the gate electrode.

In the embodiment of the present invention, the color filter 604 is formed on the protective film 603a of the lower array substrate 601, and a planarization film 603b made of an organic material such as photo-acrylic can be formed thereon. However, the present invention is not limited thereto.

The color filter substrate 606 and the array substrate 601 constructed as described above are adhered to each other by a sealant (not shown) formed on the periphery of the image display area to constitute a liquid crystal panel.

An upper polarizer 608a and a lower polarizer 608b are attached to the outer surfaces of the color filter substrate 606 and the array substrate 601 to selectively transmit only specific polarized light.

At this time, the uppermost layer of the upper polarizer 608a is provided with the low refraction layer 630 having the above-described structure to improve the reflection feeling.

Further, the low refraction layer 630 according to the present invention can change the color of the screen to a desired color. Particularly, in the liquid crystal display device of the COT structure in which the black matrix is removed, the existing yellowish color tone can be changed to neutral by the low refractive index layer 630 according to the present invention.

Such a liquid crystal panel is provided with a backlight unit on its back surface to supply light. This is because the liquid crystal display itself is a device that does not have a light emitting element, and thus requires a separate light source.

As the light source, any one of a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a fluorescent lamp of a hot cold fluorescent lamp (HCFL), or a light emitting diode (LED) may be used.

However, the present invention is not limited to the liquid crystal display device described above, but can be applied to all display devices requiring an anti-reflection treatment. For example, it can be applied not only to existing CRTs but also to PDPs, OLEDs and the like.

8A and 8B are cross-sectional views schematically showing the structure of an organic light emitting display device and a display panel according to an embodiment of the present invention.

8A and 8B, an organic light emitting display according to an exemplary embodiment of the present invention includes a display panel 750 for outputting an image, and an upper portion of the display panel 750 includes an optical An optical member 765 is attached using an adhesive 761. [

Here, the upper and lower portions of the display panel 750 do not define a specific position, so that the optical member 765 can be attached to the lower portion of the display panel 750 using the adhesive 761.

Further, the low refraction layer 730 and the protective film 764 of the present invention may be further attached to the upper surface of the optical member 765. However, the present invention is not limited thereto, and the protective film 764 may not be added.

In this case, when the display panel 750 is formed of an organic light emitting element, sub pixels are arranged in a matrix in an active area for implementing an image, and a scan for driving sub- Drivers and data drivers are located.

At this time, the sub-pixel includes an organic light emitting diode and a driving circuit.

The organic light emitting diode includes a first electrode 752, an organic compound layer, and a second electrode 757.

The organic compound layer may further include various organic layers for efficiently transporting carriers of holes or electrons to the light-emitting layers 754a, 754b, and 754c in addition to the light-emitting layers 754a, 754b, and 754c in which light is actually emitted.

The organic layers include a hole injection layer (not shown), a hole transport layer 753, a second electrode 757, and light emitting layers 754a, 754b, and 754c positioned between the first electrode 752 and the light emitting layers 754a, 754b, The electron injection layer 756 and the electron transport layer 755 may be disposed between the electron injection layer 756 and the electron injection layer 755. [

That is, the first electrode 752 is formed on the TFT substrate 751 made of plastic or glass, and the hole transport layer 753, the light emitting layers 754a, 754b, and 754c, and the electron transport layer 755, an electron injection layer 756, and a second electrode 757 are stacked.

Based on this structure, the holes injected from the first electrode 752 and the electrons injected from the second electrode 757 pass through the light-emitting layers 754a and 754b via the transport layers 753 and 755, respectively, And 754c, and then moves to a low energy level to generate light having a wavelength corresponding to an energy difference in the light emitting layers 754a, 754b, and 754c.

At this time, the light emitting layers 754a, 754b, and 754c may more specifically include a red light emitting layer 754a, a green light emitting layer 754b, and a blue light emitting layer 754c for light emission of white light.

However, the structure of such a sub-pixel is not limited to the above-described example, and can be variously modified.

An optical member 765 composed of a number of components is attached to the upper portion of the display panel 750 using the adhesive 761. The optical member 765 according to the embodiment of the present invention is attached to the display panel 750 in four minutes A quarter wave plate 762 and a linear polarizer 763, which are stacked one on top of the other. However, the present invention is not limited thereto.

The uppermost layer of the optical member 765 is provided with a low refraction layer 730 having the above-described structure in order to improve the reflection feeling.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

110, 210, 310: transparent substrate 120, 220, 320:
130, 230, 330: low refraction layer 131, 231, 331:
132,232,332: low refractive beads 133,333: pigment
233: Color bead

Claims (12)

And a low refraction layer provided on the substrate,
Wherein the low refractive layer comprises a low refractive index bead and a dye in a resin. And a low refraction layer provided on the substrate,
Wherein the low refraction layer comprises a low refractive index bead and a color bead in a resin. The antireflection film according to claim 1 or 2, wherein the base material has a refractive index larger than that of the low refractive layer. The antireflection film according to claim 3, further comprising a high refractive index layer interposed between the substrate and the low refractive index layer and having a refractive index larger than that of the low refractive index layer. The antireflection film according to claim 1, wherein the dye is chemically bonded to the low refractive index bead through a binder. 3. The antireflection film according to claim 2, wherein the color bead is filled with pigment in the hollow portion. 3. The antireflection film according to claim 2, wherein the low refractive index layer and the color bead are arranged in a direction in which the density and the diameter of the low refractive index bead increase from the bottom to the top. A low refraction layer provided on the polarizing element,
Wherein the low refraction layer comprises a low refractive index bead and a dye in a resin. A low refraction layer provided on the polarizing element,
Wherein the low refraction layer comprises a low refractive index bead and a color bead in a resin. The polarizing plate according to claim 8 or 9, further comprising a high refractive index layer interposed between the polarizing substrate and the low refractive index layer and having a refractive index larger than that of the low refractive index layer. The polarizer according to claim 9, wherein the colored beads are filled with a dye in a hollow portion. Display panel;
A display device comprising the polarizing plate according to claim 8 or 9 provided on the display panel.

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