WO2015147589A1 - Optical sheet and liquid crystal display comprising same - Google Patents

Optical sheet and liquid crystal display comprising same Download PDF

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Publication number
WO2015147589A1
WO2015147589A1 PCT/KR2015/003035 KR2015003035W WO2015147589A1 WO 2015147589 A1 WO2015147589 A1 WO 2015147589A1 KR 2015003035 W KR2015003035 W KR 2015003035W WO 2015147589 A1 WO2015147589 A1 WO 2015147589A1
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Prior art keywords
optical sheet
light diffusing
particles
diffusing particles
light
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PCT/KR2015/003035
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French (fr)
Korean (ko)
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김영신
윤영서
유설아
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코오롱인더스트리 주식회사
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Publication of WO2015147589A1 publication Critical patent/WO2015147589A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission

Definitions

  • the present invention relates to an optical sheet that can be used for a liquid crystal display, and more particularly, a substrate layer; A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern, wherein the light diffusing particles are related to an optical sheet, wherein pores and / or irregularities are formed on a surface thereof.
  • LCD which is used as an optical display element, is an indirect light emission method that displays an image by controlling transmittance of an external light source, and a backlight unit, which is a light source device, is used as an important component for determining characteristics of an LCD.
  • LCD Since LCD has a structure in which light passing through the light diffusion layer is diffused in all directions, the light emitted to the front becomes very insufficient, and thus, efforts to express higher luminance with less power consumption continue. In addition, as the display becomes larger, efforts are being made to widen the viewing angle so that more users can view it.
  • an object of the present invention is to provide a high brightness / high concealment optical sheet that can minimize the brightness reduction while improving the viewing angle and concealment.
  • Another object of the present invention is to provide a liquid crystal display device including the optical sheet and implements high brightness and high concealment.
  • the base layer A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern, wherein the light diffusing particles provide pores and / or irregularities on a surface thereof.
  • the diffusion layer is characterized by including 100 to 500 parts by weight of light diffusing particles based on 100 parts by weight of the binder resin.
  • the size of the light diffusing particles is characterized in that the 1 to 50 ⁇ m.
  • the light diffusing particles are polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polytrimethylolmethane triacrylate, polytrimethylolmethane tetraacrylate,
  • Technical characteristics are at least one member selected from the group consisting of polytrimethylolbutane triacrylate, polyethylene glycol dimethacrylate, polymethylsilsescuoxane, polystyrene, polydivinylbenzene and polyurethane.
  • the nano-sized inorganic particles are coated on the surface of the light diffusing particles, the coating of 2 to 30 parts by weight of inorganic particles with respect to 100 parts by weight of the light diffusing particles. do.
  • the width of the pattern formed on the intaglio pattern layer is 10 to 80 ⁇ m.
  • the height of the pattern formed on the intaglio pattern layer is 5 to 40 ⁇ m.
  • the distance between the patterns formed on the intaglio pattern layer is 5 ⁇ m or less.
  • Another configuration of the present invention is an optical sheet according to the present invention described above; A light source disposed on a light incident side of the optical sheet; And it provides a liquid crystal display device comprising a liquid crystal display panel disposed on the light exit side of the optical sheet.
  • an optical sheet and a liquid crystal display device including the same, which exhibit excellent luminance characteristics, viewing angle characteristics, and concealability, thereby improving light uniformity of the backlight unit BLU.
  • FIG. 1 is a cross-sectional view of an optical sheet according to an embodiment of the present invention.
  • FIG. 2 is a SEM photograph of light diffusing particles having irregularities formed according to an embodiment of the present invention.
  • FIG. 3 is a SEM photograph of light diffusing particles having pores and / or irregularities formed according to an embodiment of the present invention.
  • the present invention is a substrate layer; A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern formed thereon, wherein the light diffusing particles relate to an optical sheet having pores and / or irregularities formed on a surface thereof (FIG. 1).
  • the present invention provides a liquid crystal display device including high brightness and high concealment.
  • the base material layer used for the optical sheet of the present invention can be used as long as it is a film made of a transparent resin conventionally used for an optical sheet such as a prism sheet or a prism film.
  • a transparent resin conventionally used for an optical sheet such as a prism sheet or a prism film.
  • it may be a polyethylene terephthalate film, a polycarbonate film, a polypropylene film, a polyethylene film, a polystyrene film or a polyepoxy film.
  • the diffusion layer is formed on one surface of the substrate layer, and includes a binder resin and light diffusing particles, and specifically, may include 100 to 500 parts by weight of light diffusing particles based on 100 parts by weight of the binder resin. If the content of the diffusing particles is less than 100 parts by weight, the brightness is lowered, if more than 500 parts by weight there is a problem that the diffusion agent may be detached from the coating layer.
  • the diffusion layer is formed by dispersing light diffusing particles in a binder resin
  • the binder resin may be one in which the light diffusing particles are uniformly dispersed in the binder resin and are not separated or precipitated well.
  • methyl methacrylate resin And polymers selected from the group consisting of acrylate resins, polyamide resins, epoxy resins and urethane resins, and mixtures thereof.
  • the light diffusing particles act as a light diffusing agent for improving high hiding and high brightness performance, characterized in that pores and / or irregularities are formed on the surface.
  • the light diffusing particles preferably have a size of 1 to 50 ⁇ m, and when the light diffusing particles having such particle diameters are included in the above content, an appropriate light diffusing effect is prevented while preventing whitening and separation of the particles. Can provide.
  • the light diffusing particles are polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polytrimethylol methane triacrylate, polytrimethylol methane tetraacrylate, polytrimethylol butane triacrylate. It may be at least one member selected from the group consisting of polyethylene glycol dimethacrylate, polymethylsilsescuoxane, polystyrene, polydivinylbenzene, and polyurethane.
  • nano-sized inorganic particles were formed on the surface of the light-diffusing particles.
  • the light diffusing particles prepared by the above method are coated with nano-sized inorganic particles on the surface of the particles used as a conventional light diffusing agent, so that the refractive index is higher than that of the conventional polymer, and thus the difference in refractive index with the base layer is increased.
  • a light diffusing agent When used as a light diffusing agent can exhibit high brightness and high concealment properties.
  • the inorganic particles coated on the surface of the light diffusing particles may be used without particular limitation as long as they are particles used in the optical sheet, and are preferably selected from metals, metal oxides, hollow particles, hybrid particles, and the like. Specifically selected from the group consisting of gold, silver, tin, silica hollow silica, NaF2, CaF2, MgF2, CeF3, sol-gel silica, cerium oxide, alumina, glass, ITO, ATO, AZO, SiN4, ZrO2 and iO2 Any one may be used but is not limited thereto.
  • the light diffusing particles having pores and / or irregularities formed on the surface may be formed by mixing the polymer and the blowing agent, and then applying foam and applying heat.
  • Blowing agents that perform this function may be hydrocarbons that are uniformly dispersed in the polymer, gas or liquid under normal conditions, and do not dissolve the polymer, and may be isobutane or isopentane, and the like, but is not limited thereto.
  • the light diffusing particles prepared by the above method have irregularities as compared to the smooth surface of the particles used as the conventional light diffusing agent, and thus can exhibit high brightness characteristics by increasing the effect of diffusion when light is incident. Due to the low specific gravity compared to the existing beads, even if the same weight part is added, a larger number of particles may be included in the diffusion layer, thereby exhibiting high brightness and high hiding properties.
  • the diffusion layer may further contain additives such as surfactants, antistatic agents, dispersants, light stabilizers, thermal stabilizers, etc., depending on the coating process and the coating composition.
  • additives such as surfactants, antistatic agents, dispersants, light stabilizers, thermal stabilizers, etc., depending on the coating process and the coating composition.
  • the intaglio pattern layer is formed on the other side of the base layer, not one surface on which the diffusion layer is formed in the base layer, and the intaglio pattern layer is formed with a plurality of intaglio patterns, and the resin composition is an oligomer of a UV curable radically polymerized Acrylate-based compound.
  • a monomer-based UV curable material which may be selected from a mixture of oligomers such as epoxy-based acrylic, vinyl ether-based acrylic, and urethan-based crylate and monomers of the mono acrylate series. It is preferable to contain additives for UV curing such as.
  • the intaglio pattern is a spherical micro lens, the width of which is 10 ⁇ 80 ⁇ m, the height may be 5 ⁇ 40 ⁇ m, when the width is less than 10 ⁇ m or the height is less than 5 ⁇ m when pattern processing Since it is difficult to obtain a uniform appearance, there is a problem such as a white point in appearance of the sheet, and when the width exceeds 80 ⁇ m or the height exceeds 40 ⁇ m, there is a problem in that concealment is reduced.
  • the intaglio pattern may have a distance between adjacent intaglio patterns of 0 ⁇ 5 ⁇ m. If the interval is less than 0 ⁇ m, there is a problem that the lenses overlap and the concealment is reduced. If the interval is more than 5 ⁇ m, the brightness and the concealment are reduced.
  • the interval of the intaglio pattern refers to the interval between edges of the individual intaglio patterns, and when the distance between the intaglio patterns is 0 ⁇ m, it means that they are adjacent without gaps between the intaglio patterns.
  • the method for producing the optical sheet of the present invention is not particularly limited, and for example, the optical sheet may be manufactured by preparing the composition for forming the diffusion layer, coating the substrate layer, and curing the same, and then extruding or stamping. It can also be manufactured by law.
  • the optical sheet forms a diffusion layer using gravure on one surface of the substrate layer, mixes the light diffusing particles in the binder resin, disperses it with a milling machine, and then uses gravure to apply and hot-air-dry the diffusion layer. Formed.
  • High refractive index polymer composite particles were prepared using polymethyl methacrylate particles having an average particle diameter of 5 ⁇ m as organic polymer fine particles, and rutile type TiO 2 having an average particle diameter of 30 nm as nano-size inorganic particles.
  • a suspension was prepared by mixing 100 parts by weight of polymethyl methacrylate having an average particle diameter of 5 ⁇ m, 10 parts by weight of ISORPAR G, 12 parts by weight of ethylene glycol dimethacrylate, 1 part by weight of azobisisobutyronitrile and ion-exchanged water. After that, it was put into the reactor and stirred for 30 minutes at 700 rpm.
  • the suspension was discharged from the reactor and subjected to vigorous stirring by repeating twice at 7,000 rpm in a homomixer.
  • the suspension prepared by the vigorous stirring was put back into the 2L reactor and heated to an internal temperature of 60 ° C. while stirring at 250 rpm under a nitrogen stream. After about 2 hours or more after the heating, the initiator is expressed, the internal temperature rises to 80, and an exothermic reaction occurs. After the exothermic reaction, after 30 minutes to 1 hour time elapsed, the internal temperature again dropped to 60 degrees, the exothermic reaction was terminated, and then further stirred for 2 hours at a temperature of 90 degrees. After completion of the polymerization, the solids were filtered from the suspension and porous polymer particles were prepared through conventional washing, dehydration and drying procedures.
  • Polyethylene terephthalate film Astroll having a thickness of 188 ⁇ m was used as the base layer.
  • the diffusion layer was formed to have a dry thickness of 8 ⁇ m using gravure on one surface of the substrate layer.
  • the diffusion layer was prepared by mixing 100 parts by weight of an acrylic resin (SA02, trisulfide paint), 100 parts by weight of methyl ethyl ketone, and 100 parts by weight of toluene with a binder resin, and using light diffusing particles based on 100 parts by weight of the prepared binder resin. 120 parts by weight of the light-diffusing particles having an unevenness (average particle diameter of 5 mu m) were mixed and dispersed by a mill and then applied. Coating with gravure and hot air drying at 100 ° C. for 30 seconds to form a diffusion layer.
  • SA02 acrylic resin
  • methyl ethyl ketone methyl ethyl ketone
  • toluene toluene
  • the intaglio pattern layer is coated with an acrylic UV-curable resin coating solution (KR30, Minuttaxec) on the other side of the base layer, and then irradiated with UV while lamination with a lens-shaped embossed mold to be formed.
  • an acrylic UV-curable resin coating solution KR30, Minuttaxec
  • the negative microlens has a width of 10 ⁇ m, a height of 5 ⁇ m, and an interval between adjacent micro lenses is 5 ⁇ m.
  • Such a base layer Such a base layer; A diffusion layer formed on one surface of the substrate layer; And an intaglio pattern layer formed on the other surface of the substrate layer.
  • the diffusion layer was made to have a dry thickness of 7 ⁇ m using gravure on one surface of the base layer.
  • An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having an unevenness (average particle diameter of 15 ⁇ m) of Experimental Example 2 were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having an unevenness (average particle diameter of 25 ⁇ m) of Experimental Example 3 were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having a pore of Experimental Example 4 (average particle diameter of 5 ⁇ m) were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles (average particle diameter 15 ⁇ m) having pores of Experimental Example 5 were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having a pore of Experimental Example 6 (average particle diameter of 25 ⁇ m) were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that PMMA particles (average particle diameter: 5 ⁇ m) were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that Poly Styrene particles (average particle diameter: 5 ⁇ m) were used as the light diffusing particles.
  • An optical sheet was manufactured in the same manner as in Example 1, except that the shape of the intaglio pattern was changed according to Table 1.
  • An optical sheet was manufactured in the same manner as in Example 1, except that the shape of the intaglio pattern was changed according to Table 1.
  • the light guide plate is made of PMMA, has a thickness of 2mm, TT is 93%, and the BLU uses an edge type monitor type in which 32 LED lamps are arranged at equal intervals (1.5 cm).
  • Example 1-1 10 ⁇ m 5 ⁇ m 5 ⁇ m
  • Example 1-2 30 ⁇ m 15 ⁇ m 5 ⁇ m
  • Example 1-3 50 ⁇ m 25 ⁇ m 5 ⁇ m
  • Example 1-4 70 ⁇ m 35 ⁇ m 5 ⁇ m
  • Example 1-5 80 ⁇ m 40 ⁇ m 2 ⁇ m
  • Example 1-6 80 ⁇ m 40 ⁇ m 5 ⁇ m Comparative Example 3 - - - No pattern Comparative Example 4
  • 80 ⁇ m 40 ⁇ m 10 ⁇ m Comparative Example 5 90 ⁇ m 45 ⁇ m 2 ⁇ m
  • Example 1 Undiffused Light Diffusing Particles 5 ⁇ m
  • Example 2 Undiffused Light Diffusing Particles 15 ⁇ m
  • Example 3 Undiffused Light Diffusing Particles 25 ⁇ m
  • Example 4 Porous Light Diffuse Particles 5 ⁇ m
  • Example 5 Porous Light Diffuse Particles 15 ⁇ m
  • Example 6 Porous Light Diffuse Particles 25 ⁇ m Comparative Example 1 PMMA Particles 5 ⁇ m Comparative Example 2 Styrene Particles 5 ⁇ m

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

The present invention relates to an optical sheet which can be used in a liquid crystal display and the like and, more specifically, to an optical sheet comprising a base layer; a diffusion layer which is formed on one side of the base layer and includes a binder resin and a light diffusion particle; and an engraved pattern layer which is formed on the other side of the base layer and has an engraved pattern formed thereon, wherein the light diffusion particle has a surface on which pores and/or un-even portions are formed. The present invention provides the optical sheet which simultaneously exhibits excellent luminance characteristics, view angle characteristics and concealability, thereby improving light uniformity of a backlight unit (BLU), and the liquid crystal display comprising the same.

Description

광학시트 및 이를 포함하는 액정표시장치Optical sheet and liquid crystal display including the same
본 발명은 액정표시장치(Liquid Crystal Display) 등에 사용할 수 있는 광학시트에 관한 것으로서, 더욱 상세하게는 기재층; 상기 기재층의 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 확산층; 및 상기 기재층의 다른 일면에 형성되며 음각 패턴이 형성된 음각 패턴층을 포함하며, 상기 광확산성 입자는 표면에 기공 및/또는 요철이 형성된 것을 특징으로 하는 광학시트에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical sheet that can be used for a liquid crystal display, and more particularly, a substrate layer; A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern, wherein the light diffusing particles are related to an optical sheet, wherein pores and / or irregularities are formed on a surface thereof.
광학용 디스플레이 소자로 사용되는 LCD는 외부 광원의 투과율을 조절하여 화상을 나타내는 간접 발광방식으로, 광원장치인 백라이트 유닛은 LCD의 특성을 결정하는 중요한 부품으로 사용되고 있다.LCD, which is used as an optical display element, is an indirect light emission method that displays an image by controlling transmittance of an external light source, and a backlight unit, which is a light source device, is used as an important component for determining characteristics of an LCD.
특히 LCD 패널 제조기술이 발전함에 따라 얇고 휘도가 높은 LCD 디스플레이에 대한 요구가 높아졌고, 이에 따라 백라이트 유닛의 휘도를 높이려는 다양한 시도가 있어왔는데, 모니터, 노트북 등의 용도로 사용되는 액정 디스플레이는 적은 에너지원으로부터 밝은 광선을 발휘하는 것이 그 우수성의 척도라고 할 수 있다. 따라서 LCD의 경우 전면(前面) 휘도가 매우 중요하다.In particular, with the development of LCD panel manufacturing technology, the demand for thin and high brightness LCD displays has increased. Accordingly, various attempts have been made to increase the brightness of the backlight unit. Exhibiting bright light from an energy source can be said to be a measure of excellence. Therefore, in the case of LCD, the front brightness is very important.
LCD는 구조상 광확산층을 통과한 빛이 모든 방향으로 확산되므로 전면으로 발휘되는 빛은 매우 부족하게 되며, 따라서 적은 소비전력으로 보다 높은 휘도를 발현하고자 하는 노력이 계속되고 있다. 또한 디스플레이가 대면적화함에 따라 보다 많은 사용자가 바라볼 수 있도록 시야각을 넓히고자 하는 노력도 수행되고 있다.Since LCD has a structure in which light passing through the light diffusion layer is diffused in all directions, the light emitted to the front becomes very insufficient, and thus, efforts to express higher luminance with less power consumption continue. In addition, as the display becomes larger, efforts are being made to widen the viewing angle so that more users can view it.
이를 위하여 백라이트의 파워를 높이게 되면 소비전력이 커지고 열에 의한 전력 손실도 커진다. 따라서 휴대용 디스플레이의 경우는 배터리 용량이 커지고 배터리 수명도 단축된다.For this purpose, increasing the power of the backlight increases power consumption and heat loss. As a result, portable displays have a larger battery capacity and shorter battery life.
이에 휘도 향상을 위하여 빛에 방향성을 주는 방안으로서 다양한 렌즈 시트들이 개발되고 또한, 여러 장의 시트들이 일체화한 복합시트 들이 개발되었으나, 이러한 시트들은 비용이나 생산성 면에서 유리할 수 있으나, 휘도의 증가 측면은 기대에 못 미치는 문제가 있다 (한국공개특허 제10-2008-0106456호).In order to improve the brightness, various lens sheets have been developed as a way of directing the light, and composite sheets in which several sheets are integrated have been developed. However, these sheets may be advantageous in terms of cost and productivity, but are expected to increase brightness. There is a problem that falls short of (Korean Patent Publication No. 10-2008-0106456).
또한, 최근 LCD BLU(Backlight Uint)의 광원으로 LED의 사용이 증가하고 있고, LED 광원을 사용함에 따라 LED의 휘선이 백라이트 유닛(BLU)에 시인되어 나오는 광의 균일도가 감소되는 문제가 대두되고 있는 바, 휘도특성과 은폐성을 동시에 확보할 수 있는 기술에 대한 요구가 커지고 있다.In addition, recently, the use of LED as a light source of LCD BLU (Backlight Uint) is increasing, and the problem of decreasing the uniformity of light visually recognized by the backlight unit (BLU) is increasing with the use of the LED light source. Therefore, there is a growing demand for a technology capable of simultaneously securing luminance and concealment.
이에 본 발명은 상기 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 시야각과 은폐성이 향상되는 동시에 휘도감소를 최소화할 수 있는 고휘도/고은폐 광학시트를 제공하는 것이다. Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a high brightness / high concealment optical sheet that can minimize the brightness reduction while improving the viewing angle and concealment.
본 발명의 다른 목적은 상기 광학시트를 포함하여, 고휘도 및 고은폐성을 구현한 액정표시장치를 제공하는 것이다.Another object of the present invention is to provide a liquid crystal display device including the optical sheet and implements high brightness and high concealment.
상기와 같은 기술적 과제를 달성하기 위한 본 발명은, 기재층; 상기 기재층의 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 확산층; 및 상기 기재층의 다른 일면에 형성되며 음각 패턴이 형성된 음각 패턴층을 포함하며, 상기 광확산성 입자는 표면에 기공 및/또는 요철이 형성된 것을 특징으로 하는 광학시트를 제공한다.The present invention for achieving the above technical problem, the base layer; A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern, wherein the light diffusing particles provide pores and / or irregularities on a surface thereof.
본 발명의 일 구체예에 따르면 상기 확산층은 바인더 수지 100 중량부에 대하여 광확산성 입자 100 내지 500 중량부를 포함하는 것을 기술적 특징으로 한다.According to an embodiment of the present invention, the diffusion layer is characterized by including 100 to 500 parts by weight of light diffusing particles based on 100 parts by weight of the binder resin.
본 발명의 다른 구체예에 따르면 상기 광확산성 입자의 크기는 1 내지 50㎛인 것을 기술적 특징으로 한다. According to another embodiment of the present invention the size of the light diffusing particles is characterized in that the 1 to 50㎛.
또한, 본 발명의 다른 구체예에 따르면 상기 광확산성 입자는 폴리메틸메타크릴레이트, 폴리에틸메타크릴레이트, 폴리부틸메타크릴레이트, 폴리트리메틸올메탄 트리아크릴레이트, 폴리트리메틸올메탄 테트라아크릴레이트, 폴리트리메틸올부탄 트리아크릴레이트, 폴리에틸렌글리콜디메타크릴레이트, 폴리메틸실세스큐옥산, 폴리스티렌, 폴리디비닐벤젠 및 폴리우레탄으로 이루어진 군에서 선택되는 1종 이상인 것을 기술적 특징으로 한다. In addition, according to another embodiment of the present invention, the light diffusing particles are polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polytrimethylolmethane triacrylate, polytrimethylolmethane tetraacrylate, Technical characteristics are at least one member selected from the group consisting of polytrimethylolbutane triacrylate, polyethylene glycol dimethacrylate, polymethylsilsescuoxane, polystyrene, polydivinylbenzene and polyurethane.
또한, 본 발명의 다른 구체예에 따르면 상기 광확산성 입자의 표면에 나노크기의 무기 입자가 코팅되며, 광확산성 입자 100 중량부에 대하여 2 내지 30 중량부의 무기 입자가 코팅되는 것을 기술적 특징으로 한다.In addition, according to another embodiment of the present invention is characterized in that the nano-sized inorganic particles are coated on the surface of the light diffusing particles, the coating of 2 to 30 parts by weight of inorganic particles with respect to 100 parts by weight of the light diffusing particles. do.
또한, 본 발명의 다른 구체예에 따르면 상기 음각 패턴층에 형성된 패턴의 너비는 10 내지 80㎛인 것을 기술적 특징으로 한다.In addition, according to another embodiment of the present invention is characterized in that the width of the pattern formed on the intaglio pattern layer is 10 to 80㎛.
또한, 본 발명의 다른 구체예에 따르면 상기 음각 패턴층에 형성된 패턴의 높이는 5 내지 40㎛인 것을 기술적 특징으로 한다.In addition, according to another embodiment of the present invention is characterized in that the height of the pattern formed on the intaglio pattern layer is 5 to 40㎛.
또한, 본 발명의 다른 구체예에 따르면 상기 음각 패턴층에 형성된 패턴간의 거리는 5㎛ 이하인 것을 기술적 특징으로 한다.In addition, according to another embodiment of the present invention is characterized in that the distance between the patterns formed on the intaglio pattern layer is 5㎛ or less.
본 발명의 다른 구성은 전술한 본 발명에 따른 광학시트; 상기 광학시트의 입광측에 배치된 광원; 및 상기 광학시트의 출광측에 배치된 액정표시패널을 포함하는 액정표시장치를 제공한다.Another configuration of the present invention is an optical sheet according to the present invention described above; A light source disposed on a light incident side of the optical sheet; And it provides a liquid crystal display device comprising a liquid crystal display panel disposed on the light exit side of the optical sheet.
본 발명에 의하면 우수한 휘도특성, 시야각 특성 및 은폐성을 동시에 나타내어, 백라이트 유닛(BLU)의 광균일도를 개선하는 광학시트와 이를 포함하는 액정표시장치를 제공할 수 있다.According to the present invention, it is possible to provide an optical sheet and a liquid crystal display device including the same, which exhibit excellent luminance characteristics, viewing angle characteristics, and concealability, thereby improving light uniformity of the backlight unit BLU.
도 1은 본 발명의 일 실시예에 따른 광학시트의 단면도를 나타낸 것이다.1 is a cross-sectional view of an optical sheet according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 요철이 형성된 광확산성 입자의 SEM 사진이다.2 is a SEM photograph of light diffusing particles having irregularities formed according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 기공 및/또는 요철이 형성된 광확산성 입자의 SEM 사진이다.3 is a SEM photograph of light diffusing particles having pores and / or irregularities formed according to an embodiment of the present invention.
도 4는 기공 또는 요철이 없는 광확산성 입자의 SEM 사진이다.4 is a SEM photograph of light diffusing particles without pores or irregularities.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명은 기재층; 상기 기재층의 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 확산층; 및 상기 기재층의 다른 일면에 형성되며 음각 패턴이 형성된 음각 패턴층을 포함하며, 상기 광확산성 입자는 표면에 기공 및/또는 요철이 형성된 것을 특징으로 하는 광학시트에 관한 것이다 (도 1).The present invention is a substrate layer; A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And an intaglio pattern layer formed on another surface of the base layer and having an intaglio pattern formed thereon, wherein the light diffusing particles relate to an optical sheet having pores and / or irregularities formed on a surface thereof (FIG. 1).
본 발명에 따른 광학시트는 고휘도, 고은폐성을 구현하므로, 이를 포함하여 고휘도 및 고은폐성을 구현하는 액정표시장치를 제공한다.Since the optical sheet according to the present invention implements high brightness and high concealment, the present invention provides a liquid crystal display device including high brightness and high concealment.
이하, 본 발명에 따른 광학시트의 각 구성에 대하여 상세히 설명하고자 한다. Hereinafter, each configuration of the optical sheet according to the present invention will be described in detail.
기재층Substrate layer
본 발명의 광학시트에 사용되는 기재층은 종래 프리즘 시트 또는 프리즘 필름 등과 같은 광학시트에 사용되는 투명한 수지로 된 필름이면 어느 것이나 사용할 수 있다. 일예로 폴리에틸렌테레프탈레이트 필름, 폴리카보네이트 필름, 폴리프로필렌 필름, 폴리에틸렌 필름, 폴리스티렌 필름 또는 폴리에폭시 필름 등일 수 있다.The base material layer used for the optical sheet of the present invention can be used as long as it is a film made of a transparent resin conventionally used for an optical sheet such as a prism sheet or a prism film. For example, it may be a polyethylene terephthalate film, a polycarbonate film, a polypropylene film, a polyethylene film, a polystyrene film or a polyepoxy film.
확산층Diffusion layer
확산층은 상기 기재층의 일면에 형성되는 것으로, 바인더 수지와 광확산성 입자를 포함하며, 구체적으로는, 바인더 수지 100 중량부에 대하여 광확산성 입자 100 내지 500 중량부를 포함하는 것일 수 있으며, 광확산성 입자의 함량이 100 중량부 미만이면 휘도가 저하되고, 500 중량부 초과이면 확산제가 코팅층에서 탈리가 될 수 있는 문제가 있다.The diffusion layer is formed on one surface of the substrate layer, and includes a binder resin and light diffusing particles, and specifically, may include 100 to 500 parts by weight of light diffusing particles based on 100 parts by weight of the binder resin. If the content of the diffusing particles is less than 100 parts by weight, the brightness is lowered, if more than 500 parts by weight there is a problem that the diffusion agent may be detached from the coating layer.
확산층은 바인더 수지에 광확산성 입자를 분산시켜 형성되며, 바인더 수지는 광확산성 입자가 바인더 수지에 골고루 분산되어 분리되거나 침전이 잘 생기지 않는 것을 사용할 수 있으며, 일예로는 메틸메타크릴레이트계 수지, 아크릴레이트계 수지, 폴리아미드계 수지, 에폭시계 수지 및 우레탄계 수지로 구성된 군에서 선택되는 폴리머 및 이들의 혼합물로 구성된 군에서 선택되는 것을 사용할 수 있다. The diffusion layer is formed by dispersing light diffusing particles in a binder resin, and the binder resin may be one in which the light diffusing particles are uniformly dispersed in the binder resin and are not separated or precipitated well. For example, methyl methacrylate resin And polymers selected from the group consisting of acrylate resins, polyamide resins, epoxy resins and urethane resins, and mixtures thereof.
상기 광확산성 입자는 고은폐 및 고휘도 성능을 향상시키기 위한 광확산제로 작용하며, 표면에 기공 및/또는 요철이 형성된 것을 특징으로 한다.The light diffusing particles act as a light diffusing agent for improving high hiding and high brightness performance, characterized in that pores and / or irregularities are formed on the surface.
상기 광확산성 입자의 크기는 1 내지 50㎛인 것을 사용하는 것이 바람직하며, 이와 같은 입경의 광확산성 입자를 상기의 함량으로 포함하는 경우 백탁현상 및 입자의 이탈을 방지하면서 적절한 광확산 효과를 제공할 수 있다.The light diffusing particles preferably have a size of 1 to 50 μm, and when the light diffusing particles having such particle diameters are included in the above content, an appropriate light diffusing effect is prevented while preventing whitening and separation of the particles. Can provide.
여기서 광확산성 입자는 그 재질이 폴리메틸메타크릴레이트, 폴리에틸메타크릴레이트, 폴리부틸메타크릴레이트, 폴리트리메틸올메탄 트리아크릴레이트, 폴리트리메틸올메탄 테트라아크릴레이트, 폴리트리메틸올부탄 트리아크릴레이트, 폴리에틸렌글리콜디메타크릴레이트, 폴리메틸실세스큐옥산, 폴리스티렌, 폴리디비닐벤젠 및 폴리우레탄으로 이루어진 군에서 선택되는 1종 이상일 수 있다.Herein, the light diffusing particles are polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polytrimethylol methane triacrylate, polytrimethylol methane tetraacrylate, polytrimethylol butane triacrylate. It may be at least one member selected from the group consisting of polyethylene glycol dimethacrylate, polymethylsilsescuoxane, polystyrene, polydivinylbenzene, and polyurethane.
이와 같이 표면에 기공 및/또는 요철이 형성된 광확산성 입자를 제조함에 있어서, 본 발명의 일실시예에서는 광확산성 입자의 표면에 나노크기의 무기 입자를 코팅하여 형성하였다. 이 때 광확산성 입자 100 중량부에 대하여 2 내지 30 중량부의 무기 입자가 코팅되는 것이 바람직하며, 나노크기의 무기 입자가 2 중량부 미만이면 함량이 너무 낮아 코팅하려는 입자 표면에 코팅이 되지 않으며 30중량부를 초과하면 나노크기 무기 입자들의 함량이 너무 높아 코팅 후 남은 나노크기 무기 입자들이 서로 응집되는 현상이 발생할 수 있다.As described above, in preparing the light-diffusing particles having pores and / or irregularities formed on the surface thereof, in one embodiment of the present invention, nano-sized inorganic particles were formed on the surface of the light-diffusing particles. At this time, it is preferable that 2 to 30 parts by weight of inorganic particles are coated with respect to 100 parts by weight of the light diffusing particles. If the nano-sized inorganic particles are less than 2 parts by weight, the content is too low to coat the surface of the particles to be coated. When the amount is more than the weight part, the content of the nano-size inorganic particles may be so high that the nano-size inorganic particles remaining after the coating may aggregate with each other.
상기 방법으로 제조된 광확산성 입자는 기존의 광확산제로 사용되는 입자의 표면에 나노크기의 무기 입자가 코팅되어 있어 기존의 폴리머 보다 굴절률이 높아지고 이에 따라 기재층과의 굴절률 차이가 커지기 때문에 확산층의 광확산제로 사용되었을 시 고휘도 및 고은폐 특성을 나타낼 수 있다.The light diffusing particles prepared by the above method are coated with nano-sized inorganic particles on the surface of the particles used as a conventional light diffusing agent, so that the refractive index is higher than that of the conventional polymer, and thus the difference in refractive index with the base layer is increased. When used as a light diffusing agent can exhibit high brightness and high concealment properties.
상기 광확산성 입자의 표면에 코팅되는 무기 입자는 광학시트에 사용되는 입자라면, 특별한 제한 없이 사용될 수 있으며 바람직하게는 금속, 금속산화물, 중공입자, 하이브리드입자 등에서 선택 사용된다. 구체적으로는 금, 은, 주석, 실리카중공실리카, NaF2, CaF2, MgF2, CeF3, 졸-겔 실리카, 산화세륨, 알루미나, 유리, ITO, ATO, AZO, SiN4, ZrO2 및iO2로 이루어진 군에서 선택되는 어느 하나를 사용할 수 있으나 이에 한정되는 것은 아니다. The inorganic particles coated on the surface of the light diffusing particles may be used without particular limitation as long as they are particles used in the optical sheet, and are preferably selected from metals, metal oxides, hollow particles, hybrid particles, and the like. Specifically selected from the group consisting of gold, silver, tin, silica hollow silica, NaF2, CaF2, MgF2, CeF3, sol-gel silica, cerium oxide, alumina, glass, ITO, ATO, AZO, SiN4, ZrO2 and iO2 Any one may be used but is not limited thereto.
본 발명의 다른 실시예에 의하면 상기 표면에 기공 및/또는 요철이 형성된 광확산성 입자는 중합체와 발포제를 혼합한 후 도포하고 열을 가하여 발포시킴으로써 형성될 수 있다. According to another embodiment of the present invention, the light diffusing particles having pores and / or irregularities formed on the surface may be formed by mixing the polymer and the blowing agent, and then applying foam and applying heat.
이러한 기능을 수행하는 발포제는 중합체 내에 균일하게 분산되고, 정상 조건 하에 기체 또는 액체이고 중합체를 용해시키지 않는 탄화수소일 수 있으며, 이소부탄 혹은 이소펜탄 등을 사용할 수 있으나 이에 한정되는 것은 아니다.Blowing agents that perform this function may be hydrocarbons that are uniformly dispersed in the polymer, gas or liquid under normal conditions, and do not dissolve the polymer, and may be isobutane or isopentane, and the like, but is not limited thereto.
상기 방법으로 제조된 광확산성 입자는 기존의 광확산제로 사용되는 입자의 표면이 매끈한 것에 비해서 요철을 가지고 있어 빛이 입사되었을 때 확산되는 효과를 높임으로써 고휘도 특성을 나타낼 수 있으며, 표면의 기공으로 인하여 기존의 비드 대비 비중이 가벼워 같은 중량부를 첨가하더라도 보다 많은 수의 입자가 확산층에 함유됨에 따라 고휘도 및 고은폐 특성을 나타낼 수 있다. The light diffusing particles prepared by the above method have irregularities as compared to the smooth surface of the particles used as the conventional light diffusing agent, and thus can exhibit high brightness characteristics by increasing the effect of diffusion when light is incident. Due to the low specific gravity compared to the existing beads, even if the same weight part is added, a larger number of particles may be included in the diffusion layer, thereby exhibiting high brightness and high hiding properties.
또한, 상기 확산층은 코팅 공정 및 코팅 조성에 따라, 계면활성제, 대전방지제, 분산제, 광안정제, 열안정제 등과 같은 첨가제를 더 함유할 수 있다.In addition, the diffusion layer may further contain additives such as surfactants, antistatic agents, dispersants, light stabilizers, thermal stabilizers, etc., depending on the coating process and the coating composition.
음각 패턴층Engraving pattern layer
음각 패턴층은 기재층에서 확산층이 형성된 일면이 아닌 기재층의 다른 일면에 형성되며, 상기 음각 패턴층에는 음각 패턴이 다수 형성되어 있으며, 그 수지 조성물은 UV 경화성의 라디칼 중합형 Acrylate계 화합물의 올리고머 및 모노머를 주체로 한 UV 경화성 물질로 에폭시계 Acrylate, Vinyl ether계 Acrylate, Urethan 계 Acrylate의 등의 올리고머와 Mono acrylate의 계열의 모노머와의 혼합물 중 선택될 수 있으며, 좌외선 중합개시제 및 광증감제 등의 UV경화를 위한 첨가제를 함유하는 것이 바람직하다. The intaglio pattern layer is formed on the other side of the base layer, not one surface on which the diffusion layer is formed in the base layer, and the intaglio pattern layer is formed with a plurality of intaglio patterns, and the resin composition is an oligomer of a UV curable radically polymerized Acrylate-based compound. And a monomer-based UV curable material, which may be selected from a mixture of oligomers such as epoxy-based acrylic, vinyl ether-based acrylic, and urethan-based crylate and monomers of the mono acrylate series. It is preferable to contain additives for UV curing such as.
상기 음각 패턴은 그 형상이 구형의 마이크로 렌즈의 형상으로 그 너비가 10~80㎛이고, 그 높이가 5~40㎛인 것일 수 있으며, 너비가 10 ㎛ 미만 또는 높이가 5㎛ 미만이면 패턴 가공시 균일한 외관을 얻기가 힘들어 시트의 외관상 백점과 같은 문제가 있고, 너비가 80㎛를 초과 또는 높이가 40㎛를 초과하면 은폐성이 감소되는 문제가 있다. The intaglio pattern is a spherical micro lens, the width of which is 10 ~ 80㎛, the height may be 5 ~ 40㎛, when the width is less than 10 ㎛ or the height is less than 5 ㎛ when pattern processing Since it is difficult to obtain a uniform appearance, there is a problem such as a white point in appearance of the sheet, and when the width exceeds 80 μm or the height exceeds 40 μm, there is a problem in that concealment is reduced.
상기 음각 패턴은 인접한 음각 패턴간의 거리가 0~5㎛일 수 있다. 그 간격이 0㎛ 미만이면 렌즈가 겹치게 되어 은폐성이 감소하게 되는 문제가 있고, 5㎛를 초과할 경우 휘도와 은폐성이 감소된다. 이때, 음각 패턴의 간격은 개별 음각 패턴의 에지(edge) 간의 간격을 의미하고, 음각 패턴간의 거리가 0㎛인 경우는 음각 패턴간의 간격 없이 인접한 형태인 것을 의미한다.The intaglio pattern may have a distance between adjacent intaglio patterns of 0˜5 μm. If the interval is less than 0 μm, there is a problem that the lenses overlap and the concealment is reduced. If the interval is more than 5 μm, the brightness and the concealment are reduced. In this case, the interval of the intaglio pattern refers to the interval between edges of the individual intaglio patterns, and when the distance between the intaglio patterns is 0 μm, it means that they are adjacent without gaps between the intaglio patterns.
본 발명의 광학 시트를 제조하는 방법은 특별히 한정된 것은 아니며, 예컨대 상기 확산층 형성용 조성물을 제조한 후, 이것을 기재층에 코팅한 후 경화시킴으로써 광학 시트를 제조할 수 있고, 또한 압출 혹은 스탬핑(Stamping)법을 통해 제조할 수도 있다. The method for producing the optical sheet of the present invention is not particularly limited, and for example, the optical sheet may be manufactured by preparing the composition for forming the diffusion layer, coating the substrate layer, and curing the same, and then extruding or stamping. It can also be manufactured by law.
본 발명의 일 실시예에서는 광학시트는 기재층의 일면에 그라비아를 사용하여 확산층을 형성하되, 바인더 수지에 광확산성 입자를 혼합하여 밀링기로 분산시킨 후 그라비아를 사용하여 도포하고 열풍건조시켜 확산층을 형성하였다.In an embodiment of the present invention, the optical sheet forms a diffusion layer using gravure on one surface of the substrate layer, mixes the light diffusing particles in the binder resin, disperses it with a milling machine, and then uses gravure to apply and hot-air-dry the diffusion layer. Formed.
또한, 상기 기재층의 다른 일면에 수지 코팅액을 도포한 후 형성하고자 하는 음각 패턴 형상의 양각 몰드와 함께 Lamination하면서 UV를 조사한 후 양각의 몰드를 이형함으로써 음각 패턴을 포함하는 음각 패턴층을 형성하여 광학시트를 제조할 수 있다.In addition, by applying a resin coating solution to the other surface of the base layer and irradiated with UV while lamination with the embossed mold of the intaglio pattern shape to be formed and then release the embossed mold to form an intaglio pattern layer including the intaglio pattern by optical Sheets can be produced.
이하, 본 발명을 실험예 및 실시예를 통하여 보다 상세히 설명하나, 본 발명의 범위가 하기 실험예 및 실시예로 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail through Experimental Examples and Examples, but the scope of the present invention is not limited to the following Experimental Examples and Examples.
실험예 1 (요철이 있는 광확산성 입자 제조)Experimental Example 1 (Manufacture of Light Diffusing Particles with Unevenness)
유기 폴리머 미립자로서 평균입경 5㎛의 폴리메틸메타크릴레이트 입자를 사용하고, 나노 크기의 무기 입자로서 평균입경 30nm의 루타일 타입 TiO2를 사용하여 고굴절율의 폴리머 복합 입자를 제조하였다.High refractive index polymer composite particles were prepared using polymethyl methacrylate particles having an average particle diameter of 5 μm as organic polymer fine particles, and rutile type TiO 2 having an average particle diameter of 30 nm as nano-size inorganic particles.
건식 고에너지형 혼합기(노빌타: Nobilta NOA 103, 제조사: HOSOKAWA MICRON CORPORATION)의 사용에 있어서, 혼합기의 간극은 1.0㎜로 고정하였으며, 내부용기 회전속도는 3,000rpm으로 조절하여, 공정시간 2분으로 하여 메카노퓨전(Mechnofusion)을 하여 고굴절율의 폴리머 복합 입자를 제조하였다. 이 때, 상기 폴리메틸메타크릴레이트 입자 100 중량부에 대하여 TiO2 10중량부를 사용하였다. In the use of a dry high energy type mixer (Nobilta NOA 103, manufacturer: HOSOKAWA MICRON CORPORATION), the gap of the mixer was fixed at 1.0 mm, and the rotation speed of the inner container was adjusted to 3,000 rpm, and the process time was 2 minutes. Mechanofusion was performed to prepare polymer composite particles having high refractive index. At this time, 10 parts by weight of TiO 2 was used based on 100 parts by weight of the polymethyl methacrylate particles.
실험예 2 (요철이 있는 광확산성 입자 제조)Experimental Example 2 (Preparation of Light Diffusion Particles with Unevenness)
평균입경 15㎛의 폴리메틸메타크릴레이트 입자를 사용한 것을 제외하고는 실험예 1과 동일한 방법으로 요철이 있는 광확산성 입자 입자를 제조하였다.Except that the polymethyl methacrylate particles having an average particle diameter of 15㎛ was used in the same manner as in Experimental Example 1 light diffusive particles with irregularities were prepared.
실험예 3 (요철이 있는 광확산성 입자 제조)Experimental Example 3 (Preparation of Light Diffusion Particles with Unevenness)
평균입경 25㎛의 폴리메틸메타크릴레이트 입자를 사용한 것을 제외하고는 실험예 1과 동일한 방법으로 요철이 있는 광확산성 입자를 제조하였다.Except that the polymethyl methacrylate particles having an average particle diameter of 25㎛ was used in the same manner as in Experimental Example 1 light diffusing particles with irregularities were prepared.
실험예 4 (기공이 있는 광확산성 입자 제조)Experimental Example 4 (Manufacture of Light Diffusion Particles with Pores)
평균입경 5㎛의 폴리메틸메타크릴레이트 100 중량부, ISORPAR G 10중량부, 에틸렌글리콜디메타크릴레이트 12 중량부, 아조비스이소부티로니트릴 1 중량부 및 이온교환수를 혼합하여 현탁액을 제조한 후에, 반응기에 넣고 700rpm 속도로 30분간 교반시켰다.A suspension was prepared by mixing 100 parts by weight of polymethyl methacrylate having an average particle diameter of 5 μm, 10 parts by weight of ISORPAR G, 12 parts by weight of ethylene glycol dimethacrylate, 1 part by weight of azobisisobutyronitrile and ion-exchanged water. After that, it was put into the reactor and stirred for 30 minutes at 700 rpm.
상기 현탁액을 반응기로부터 토출하여 호모믹서에서 7,000rpm으로 2번 반복하여 강력 교반을 실시하였다. 상기 강력 교반으로 제조된 현탁액을 다시 2L 반응기에 투입하여 질소 기류 하에서 250rpm 속도로 교반하면서 내부 온도가 60℃가 되도록 가열하였다. 상기 가열 후 약 2시간 이상이 지나면, 개시제가 발현하여 내부온도가 80까지 올라 발열 반응이 일어나게 된다. 상기 발열 반응 이후, 30분 내지 1시간 시간이 경과되면 내부 온도가 다시 60도로 떨어지고, 발열반응이 종결되었으며, 이후 90도의 온도에서 2시간 동안 더 교반을 진행하였다. 중합 완료 후, 현탁액으로부터 고체를 여과하고, 통상적인 세정, 탈수 및 건조 과정을 거쳐 다공성 폴리머 입자를 제조하였다.The suspension was discharged from the reactor and subjected to vigorous stirring by repeating twice at 7,000 rpm in a homomixer. The suspension prepared by the vigorous stirring was put back into the 2L reactor and heated to an internal temperature of 60 ° C. while stirring at 250 rpm under a nitrogen stream. After about 2 hours or more after the heating, the initiator is expressed, the internal temperature rises to 80, and an exothermic reaction occurs. After the exothermic reaction, after 30 minutes to 1 hour time elapsed, the internal temperature again dropped to 60 degrees, the exothermic reaction was terminated, and then further stirred for 2 hours at a temperature of 90 degrees. After completion of the polymerization, the solids were filtered from the suspension and porous polymer particles were prepared through conventional washing, dehydration and drying procedures.
실험예 5 (기공이 있는 광확산성 입자 제조)Experimental Example 5 (Manufacture of Light Diffusion Particles with Pores)
평균입경 15㎛의 폴리메틸메타크릴레이트 입자를 사용한 것을 제외하고는 실험예 4과 동일한 방법으로 기공이 있는 광확산성 입자를 제조하였다.Except for using polymethyl methacrylate particles having an average particle diameter of 15㎛, light diffusing particles having pores were prepared in the same manner as in Experimental Example 4. Prepared.
실험예 6 (기공이 있는 광확산성 입자 제조)Experimental Example 6 (Production of light diffusing particles with pores)
평균입경 25㎛의 폴리메틸메타크릴레이트 입자를 사용한 것을 제외하고는 실험예 4과 동일한 방법으로 기공이 있는 광확산성 입자를 제조하였다.Except that the polymethyl methacrylate particles having an average particle diameter of 25㎛ was used in the same manner as in Experimental Example 4 light-diffusing particles with pores were prepared.
실시예 1-1Example 1-1
기재층으로 두께 188㎛의 폴리에틸렌테레프탈레이트 필름 Astroll(코오롱)을 사용하였다.Polyethylene terephthalate film Astroll (Kolon) having a thickness of 188 µm was used as the base layer.
확산층은 상기 기재층의 일면에 그라비아를 사용해 건조두께 8㎛이 되도록 형성하였다. 상기 확산층은 바인더 수지로 아크릴수지(SA02, 삼화페인트) 100중량부, 메틸에틸케톤 100중량부, 톨루엔 100중량부를 혼합하여 제조하고, 제조된 바인더 수지 100중량부에 대하여 광확산성 입자로 실험예 1의 요철이 있는 광확산성 입자(평균입경 5㎛) 120중량부를 혼합하여 밀링기로 분산시킨 후 도포하였다. 그라비아를 사용하여 코팅하고 100℃에서 30초간 열풍 건조시켜 확산층을 형성하였다.The diffusion layer was formed to have a dry thickness of 8 μm using gravure on one surface of the substrate layer. The diffusion layer was prepared by mixing 100 parts by weight of an acrylic resin (SA02, trisulfide paint), 100 parts by weight of methyl ethyl ketone, and 100 parts by weight of toluene with a binder resin, and using light diffusing particles based on 100 parts by weight of the prepared binder resin. 120 parts by weight of the light-diffusing particles having an unevenness (average particle diameter of 5 mu m) were mixed and dispersed by a mill and then applied. Coating with gravure and hot air drying at 100 ° C. for 30 seconds to form a diffusion layer.
음각 패턴층은 상기 기재층의 다른 일면에 아크릴계 UV경화형 수지 코팅액(KR30, 미뉴탁텍)을 도포한 후 형성하고자 하는 렌즈형상의 양각 몰드와 함께 Lamination하면서 UV를 조사한 후 양각의 몰드를 이형하여 음각 반구 형태의 마이크로 렌즈 형태하였다. 이때, 상기 음각 마이크로 렌즈의 너비는 10㎛, 높이는 5㎛ 및 인접한 마이크로 렌즈 간의 간격은 5㎛이다. The intaglio pattern layer is coated with an acrylic UV-curable resin coating solution (KR30, Minuttaxec) on the other side of the base layer, and then irradiated with UV while lamination with a lens-shaped embossed mold to be formed. In the form of a micro lens. In this case, the negative microlens has a width of 10 μm, a height of 5 μm, and an interval between adjacent micro lenses is 5 μm.
이와 같은 기재층; 상기 기재층의 일면에 형성된 확산층; 및 상기 기재층의 다른 일면에 형성된 음각 패턴층을 포함하는 광학시트를 제조하였다.Such a base layer; A diffusion layer formed on one surface of the substrate layer; And an intaglio pattern layer formed on the other surface of the substrate layer.
이하 실시예에서 확산층은 상기 기재층의 일면에 그라비아를 사용해 건조두께 7㎛이 되도록 하였다.In the following examples, the diffusion layer was made to have a dry thickness of 7 μm using gravure on one surface of the base layer.
실시예 2Example 2
광확산성 입자로 실험예 2의 요철이 있는 광확산성 입자(평균입경 15㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having an unevenness (average particle diameter of 15 μm) of Experimental Example 2 were used as the light diffusing particles.
실시예 3Example 3
광확산성 입자로 실험예 3의 요철이 있는 광확산성 입자(평균입경 25㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having an unevenness (average particle diameter of 25 μm) of Experimental Example 3 were used as the light diffusing particles.
실시예 4Example 4
광확산성 입자로 실험예 4의 기공이 있는 광확산성 입자(평균입경 5㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having a pore of Experimental Example 4 (average particle diameter of 5 μm) were used as the light diffusing particles.
실시예 5Example 5
광확산성 입자로 실험예 5의 기공이 있는 광확산성 입자(평균입경 15㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles (average particle diameter 15 μm) having pores of Experimental Example 5 were used as the light diffusing particles.
실시예 6Example 6
광확산성 입자로 실험예 6의 기공이 있는 광확산성 입자(평균입경 25㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that light diffusing particles having a pore of Experimental Example 6 (average particle diameter of 25 μm) were used as the light diffusing particles.
비교예 1Comparative Example 1
광확산성 입자로 PMMA 입자(평균입경 5㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that PMMA particles (average particle diameter: 5 μm) were used as the light diffusing particles.
비교예 2Comparative Example 2
광확산성 입자로 Poly Styrene 입자(평균입경 5㎛)를 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that Poly Styrene particles (average particle diameter: 5 μm) were used as the light diffusing particles.
실시예 1-2 내지 실시예 1-6Example 1-2 to Example 1-6
표 1에 따라 음각 패턴의 형상을 변화시킨 것을 제외하고 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that the shape of the intaglio pattern was changed according to Table 1.
비교예 3 내지 비교예 5Comparative Examples 3 to 5
표 1에 따라 음각 패턴의 형상을 변화시킨 것을 제외하고 실시예 1과 동일한 방법으로 광학시트를 제조하였다.An optical sheet was manufactured in the same manner as in Example 1, except that the shape of the intaglio pattern was changed according to Table 1.
실시예 및 비교예에서 제조된 광학시트에 대하여, 휘도, 시야각 및 은폐성을 측정하여, 그 결과를 표 3에 기재하였다.With respect to the optical sheets prepared in Examples and Comparative Examples, the brightness, viewing angle, and concealment were measured, and the results are shown in Table 3.
휘도Luminance
24인치 액정디스플레이 패널용 백라이트 유닛에 상기 제조된 실시예 및 비교예의 광학시트를 적층하여 고정하고, 휘도계(모델명: BM-7A, 일본 TOPCON사)를 사용하여 임의의 13지점의 휘도를 측정하여 그 평균값을 구하였다.By laminating and fixing the optical sheets of the above-described examples and comparative examples on a backlight unit for a 24-inch liquid crystal display panel, and measuring the luminance of arbitrary 13 points using a luminance meter (model name: BM-7A, Japan TOPCON) The average value was calculated | required.
시야각Viewing angle
시야각은 탑콘사의 BM-7A을 이용하여 측정하였고, 값은 백라이트 유닛(LG 디스플레이LED 21.5인치 Horizontal LED BLU)내에 실시예 및 비교예에서 제조된 광학시트를 고정하고, 정면(시야각 = 0 위치) 휘도 대비 절반의 휘도값을 갖는 위치의 시야각을 측정하였다.The viewing angle was measured using Topcon's BM-7A, and the value was fixed in the backlight unit (LG Display LED 21.5 inch Horizontal LED BLU) to fix the optical sheets manufactured in Examples and Comparative Examples, and the front (viewing angle = 0 position). The viewing angle at the position having half the luminance value relative to the luminance was measured.
은폐성Concealable
액정디스플레이 패널용 백라이트 유닛(LG 디스플레이 LED 21.5인치 Horizontal LED BLU)에 도광판과 실시예 및 비교예에서 제조된 광학시트를 고정하고 램프 휘선의 비침 여부를 육안 관찰하여, 정도에 따라 하기와 같이 5단계로 상대적으로 관능 평가하였다.Fix the light guide plate and the optical sheet manufactured in Example and Comparative Example to the backlight unit for LCD display panel (LG Display LED 21.5 inch Horizontal LED BLU) and observe whether the lamp line is illuminated or not. It was relatively sensory evaluation.
도광판은 PMMA로 제조되고 두께가2mm이며 TT는 93%인 것을 사용하였고, BLU는 위쪽에 32개의 LED램프가 등간격(1.5cm)으로 배치된 엣지형 모니터 타입을 사용하였다.The light guide plate is made of PMMA, has a thickness of 2mm, TT is 93%, and the BLU uses an edge type monitor type in which 32 LED lamps are arranged at equal intervals (1.5 cm).
비침 수준 : (은폐성 좋음) 5-4-3-2-1 (은폐성 나쁨)Level: (Concealed good) 5-4-3-2-1 (Poor concealed)
표 1
음각 패턴층
너비 높이 인접 패턴 간격 비고
실시예1-1 10㎛ 5㎛ 5㎛
실시예1-2 30㎛ 15㎛ 5㎛
실시예1-3 50㎛ 25㎛ 5㎛
실시예1-4 70㎛ 35㎛ 5㎛
실시예1-5 80㎛ 40㎛ 2㎛
실시예1-6 80㎛ 40㎛ 5㎛
비교예3 - - - 패턴 없음
비교예4 80㎛ 40㎛ 10㎛
비교예5 90㎛ 45㎛ 2㎛
Table 1
Engraving pattern layer
width Height Adjacent Pattern Spacing Remarks
Example 1-1 10 μm 5 μm 5 μm
Example 1-2 30 μm 15 μm 5 μm
Example 1-3 50 μm 25 μm 5 μm
Example 1-4 70㎛ 35 μm 5 μm
Example 1-5 80㎛ 40 μm 2 μm
Example 1-6 80㎛ 40 μm 5 μm
Comparative Example 3 - - - No pattern
Comparative Example 4 80㎛ 40 μm 10 μm
Comparative Example 5 90 μm 45㎛ 2 μm
표 2
확산층
입자 종류 평균 입자 크기
실시예 1 요철이 있는 광확산성 입자 5㎛
실시예 2 요철이 있는 광확산성 입자 15㎛
실시예 3 요철이 있는 광확산성 입자 25㎛
실시예 4 기공이 있는 광확산성 입자 5㎛
실시예 5 기공이 있는 광확산성 입자 15㎛
실시예 6 기공이 있는 광확산성 입자 25㎛
비교예 1 PMMA 입자 5㎛
비교예 2 Styrene 입자 5㎛
TABLE 2
Diffusion layer
Particle type Average particle size
Example 1 Undiffused Light Diffusing Particles 5 μm
Example 2 Undiffused Light Diffusing Particles 15 μm
Example 3 Undiffused Light Diffusing Particles 25 μm
Example 4 Porous Light Diffuse Particles 5 μm
Example 5 Porous Light Diffuse Particles 15 μm
Example 6 Porous Light Diffuse Particles 25 μm
Comparative Example 1 PMMA Particles 5 μm
Comparative Example 2 Styrene Particles 5 μm
표 3
휘도 (cd/m2) 시야각 (O) 은폐성
실시예1-1 5200 45 4
실시예1-2 5210 44 4
실시예1-3 5216 45 4
실시예1-4 5207 44 3
실시예1-5 5215 45 4
실시예1-6 5204 45 3
실시예 2 5205 45 5
실시예 3 5210 44 4
실시예 4 5205 45 5
실시예 5 5220 45 5
실시예 6 5204 44 4
비교예 1 5180 44 2
비교예 2 5145 43 2
비교예3 5201 45 1
비교예4 5216 45 2
비교예5 5230 45 2
TABLE 3
Luminance (cd / m 2 ) Viewing angle ( O ) Concealable
Example 1-1 5200 45 4
Example 1-2 5210 44 4
Example 1-3 5216 45 4
Example 1-4 5207 44 3
Example 1-5 5215 45 4
Example 1-6 5204 45 3
Example 2 5205 45 5
Example 3 5210 44 4
Example 4 5205 45 5
Example 5 5220 45 5
Example 6 5204 44 4
Comparative Example 1 5180 44 2
Comparative Example 2 5145 43 2
Comparative Example 3 5201 45 One
Comparative Example 4 5216 45 2
Comparative Example 5 5230 45 2
물성측정결과, 표 1에 나타난 바와 같이, 확산층에 표면에 기공 및/또는 요철이 형성된 광확산성 입자를 사용한 경우, 기존의 PMMA 입자나 Styrene 입자를 사용한 것에 비하여 휘도 저하 없이 고은폐 특성을 달성할 수 있음을 확인 하였다.As a result of measuring the physical properties, as shown in Table 1, when the light diffusing particles having pores and / or irregularities formed on the surface of the diffusion layer were used, high concealment characteristics could be achieved without lowering luminance as compared with conventional PMMA particles or Styrene particles. Confirmed that it can.

Claims (10)

  1. 기재층;Base layer;
    상기 기재층의 일면에 형성되며, 바인더 수지와 광확산성 입자를 포함하는 확산층; 및 A diffusion layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And
    상기 기재층의 다른 일면에 형성되며 음각 패턴이 형성된 음각 패턴층을 포함하며,It is formed on the other side of the base layer and includes an intaglio pattern layer is formed in the intaglio pattern,
    상기 광확산성 입자는 표면에 기공 및/또는 요철이 형성된 것을 특징으로 하는 광학시트.The light diffusing particles, the optical sheet, characterized in that pores and / or irregularities formed on the surface.
  2. 제1항에 있어서, 상기 확산층은 바인더 수지 100 중량부에 대하여 광확산성 입자 100 내지 500 중량부를 포함하는 것을 특징으로 하는 광학시트.The optical sheet according to claim 1, wherein the diffusion layer comprises 100 to 500 parts by weight of light diffusing particles based on 100 parts by weight of the binder resin.
  3. 제1항에 있어서, 상기 광확산성 입자의 크기는 1 내지 50㎛인 것을 특징으로 하는 광학시트.The optical sheet of claim 1, wherein the light diffusing particles have a size of 1 to 50 μm.
  4. 제1항에 있어서, 상기 광확산성 입자는 폴리메틸메타크릴레이트, 폴리에틸메타크릴레이트, 폴리부틸메타크릴레이트, 폴리트리메틸올메탄 트리아크릴레이트, 폴리트리메틸올메탄 테트라아크릴레이트, 폴리트리메틸올부탄 트리아크릴레이트, 폴리에틸렌글리콜디메타크릴레이트, 폴리메틸실세스큐옥산, 폴리스티렌, 폴리디비닐벤젠 및 폴리우레탄으로 이루어진 군에서 선택되는 1종 이상인 것을 특징으로 하는 광학시트.The method of claim 1, wherein the light diffusing particles are polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polytrimethylolmethane triacrylate, polytrimethylolmethane tetraacrylate, polytrimethylolbutane An optical sheet comprising at least one member selected from the group consisting of triacrylate, polyethylene glycol dimethacrylate, polymethylsilsescuoxane, polystyrene, polydivinylbenzene, and polyurethane.
  5. 제1항에 있어서, 상기 광확산성 입자의 표면에 나노크기의 무기 입자가 코팅되는 것을 특징으로 하는 광학시트.The optical sheet of claim 1, wherein nanoscale inorganic particles are coated on the surface of the light diffusing particles.
  6. 제5항에 있어서, 광확산성 입자 100 중량부에 대하여 2 내지 30 중량부의 무기 입자가 코팅되는 것을 특징으로 하는 광학시트.The optical sheet according to claim 5, wherein 2 to 30 parts by weight of inorganic particles are coated based on 100 parts by weight of light diffusing particles.
  7. 제1항에 있어서, 상기 음각 패턴층에 형성된 패턴의 너비는 10 내지 80㎛인 것을 특징으로 하는 광학시트.The optical sheet of claim 1, wherein a width of the pattern formed on the intaglio pattern layer is 10 to 80 μm.
  8. 제1항에 있어서, 상기 음각 패턴층에 형성된 패턴의 높이는 5 내지 40㎛인 것을 특징으로 하는 광학시트.The optical sheet of claim 1, wherein a height of the pattern formed on the intaglio pattern layer is 5 to 40 μm.
  9. 제1항에 있어서, 상기 음각 패턴층에 형성된 패턴간의 거리는 5㎛ 이하인 것을 특징으로 하는 광학시트.The optical sheet of claim 1, wherein a distance between patterns formed on the intaglio pattern layer is 5 μm or less.
  10. 제1항 내지 제9항 중 어느 한 항의 광학시트;The optical sheet of any one of claims 1 to 9;
    상기 광학시트의 입광측에 배치된 광원; 및A light source disposed on a light incident side of the optical sheet; And
    상기 광학시트의 출광측에 배치된 액정표시패널을 포함하는 액정표시장치.And a liquid crystal display panel disposed on the light exit side of the optical sheet.
PCT/KR2015/003035 2014-03-27 2015-03-27 Optical sheet and liquid crystal display comprising same WO2015147589A1 (en)

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KR20100026417A (en) * 2008-08-29 2010-03-10 엘지이노텍 주식회사 Hybrid-optical sheet and back light unit using hybrid-optical sheet
KR20100107891A (en) * 2009-03-27 2010-10-06 주식회사 코오롱 Optical sheet
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