WO2015147589A1 - Feuille optique et dispositif d'affichage à cristaux liquides comprenant cette dernière - Google Patents

Feuille optique et dispositif d'affichage à cristaux liquides comprenant cette dernière 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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WO
WIPO (PCT)
Prior art keywords
optical sheet
light diffusing
particles
diffusing particles
light
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PCT/KR2015/003035
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English (en)
Korean (ko)
Inventor
김영신
윤영서
유설아
Original Assignee
코오롱인더스트리 주식회사
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Publication of WO2015147589A1 publication Critical patent/WO2015147589A1/fr

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

Abstract

La présente invention se rapporte à une feuille optique qui peut être utilisée dans un dispositif d'affichage à cristaux liquides, et similaire, et, de façon plus précise, à une feuille optique comprenant une couche de base ; une couche de diffusion qui est formée sur un côté de la couche de base et comprend une résine liante et une particule de diffusion de lumière ; et une couche de motif gravé qui est formée sur l'autre côté de la couche de base et sur laquelle est formé un motif gravé, la particule de diffusion de lumière comportant une surface sur laquelle des pores et/ou des parties irrégulières sont formés. La présente invention porte sur la feuille optique qui présente en même temps d'excellentes caractéristiques de luminance, d'excellentes caractéristiques d'angle de vision et une excellente discrétion, ce qui permet d'améliorer l'uniformité de la lumière d'une unité de rétroéclairage (BLU), et sur le dispositif d'affichage à cristaux liquides comprenant ladite feuille optique.
PCT/KR2015/003035 2014-03-27 2015-03-27 Feuille optique et dispositif d'affichage à cristaux liquides comprenant cette dernière WO2015147589A1 (fr)

Applications Claiming Priority (2)

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KR20140035767 2014-03-27
KR10-2014-0035767 2014-03-27

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WO2015147589A1 true WO2015147589A1 (fr) 2015-10-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114624921A (zh) * 2022-03-11 2022-06-14 纳晶科技股份有限公司 光学板及含其的显示装置、量子点光学板的制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040021810A1 (en) * 2000-07-28 2004-02-05 Mariko Kawaguri Reflection sheet and production method therefor and display unit using it
KR20100026417A (ko) * 2008-08-29 2010-03-10 엘지이노텍 주식회사 백라이트 용 하이브리드 광학시트
KR20100107891A (ko) * 2009-03-27 2010-10-06 주식회사 코오롱 광학 시트
KR20100130811A (ko) * 2009-06-04 2010-12-14 제일모직주식회사 폴리머 피복된 에어로겔을 이용한 광확산필름
KR20130033288A (ko) * 2012-08-22 2013-04-03 주식회사 세코닉스 비정형 패턴을 갖는 광학필름 및 그 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040021810A1 (en) * 2000-07-28 2004-02-05 Mariko Kawaguri Reflection sheet and production method therefor and display unit using it
KR20100026417A (ko) * 2008-08-29 2010-03-10 엘지이노텍 주식회사 백라이트 용 하이브리드 광학시트
KR20100107891A (ko) * 2009-03-27 2010-10-06 주식회사 코오롱 광학 시트
KR20100130811A (ko) * 2009-06-04 2010-12-14 제일모직주식회사 폴리머 피복된 에어로겔을 이용한 광확산필름
KR20130033288A (ko) * 2012-08-22 2013-04-03 주식회사 세코닉스 비정형 패턴을 갖는 광학필름 및 그 제조방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114624921A (zh) * 2022-03-11 2022-06-14 纳晶科技股份有限公司 光学板及含其的显示装置、量子点光学板的制备方法

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