WO2014209032A1 - Optical member and backlight unit comprising same - Google Patents

Optical member and backlight unit comprising same Download PDF

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Publication number
WO2014209032A1
WO2014209032A1 PCT/KR2014/005683 KR2014005683W WO2014209032A1 WO 2014209032 A1 WO2014209032 A1 WO 2014209032A1 KR 2014005683 W KR2014005683 W KR 2014005683W WO 2014209032 A1 WO2014209032 A1 WO 2014209032A1
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WO
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Prior art keywords
sheet
optical member
particles
layer
diffusion sheet
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PCT/KR2014/005683
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French (fr)
Korean (ko)
Inventor
김경종
남시욱
신진호
김경화
Original Assignee
코오롱인더스트리 주식회사
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Publication of WO2014209032A1 publication Critical patent/WO2014209032A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • 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
    • G02B5/0231—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 microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to an optical member used in a liquid crystal display and a backlight unit including the same.
  • a liquid crystal display used as an optical display element is an indirect light emission method of controlling the transmittance of an external light source to display an image, and a backlight unit, which is a light source device, is used as an important component for determining characteristics of a liquid crystal display.
  • the backlight unit sequentially passes the light emitted using a light source such as a light emitting diode (LED) through the light guide plate, the diffusion sheet, and the prism sheet to reach the liquid crystal panel.
  • a light source such as a light emitting diode (LED)
  • the light guide plate is mounted in the case of an edge type backlight unit, and transmits the light emitted from the light source to be distributed over the front surface of the liquid crystal panel in a flat shape, and a diffusion member such as a diffusion sheet obtains uniform light intensity across the entire screen.
  • a device such as a light source mounted to the lower part of the diffusion member so as to be hidden from the front.
  • the prism sheet performs a light path control function for converging light rays from various directions passing through the diffusion member within a range of viewing angle ⁇ suitable for the viewer to recognize the image to be collected.
  • the lower portion of the light guide plate is provided with a reflective sheet for increasing the use efficiency of the light source by being able to reflect the light that is not delivered to the liquid crystal panel off the path again.
  • the prism sheet has a triangular array structure having a 45 ° inclined surface for improving the brightness in the front direction. Therefore, since the angles emitted from the same type of prism are the same for each array, even if a small crush occurs at the corners of the triangle or minute scratches occur on the inclined surface, the defects are caused by the difference in the light paths emitted between the damaged parts and the normal parts. Will be processed. Therefore, fine foreign matters are not allowed in the production of the prism sheet, and in some cases, even the minute defects make it impossible to use the entire surface of the produced prism sheet. This leads to a decrease in productivity, which in turn is a burden of cost increase. In addition, when laminating the work on the backlight unit, several laminations are performed by manpower. The prism sheet also requires considerable attention when working by hand, and the back light unit is increased due to the increase in the TACT time required for assembling the backlight unit and the supply of manpower. This will lead to an increase in the supply cost.
  • a light collecting sheet is manufactured using a lens having a hemispherical cross-section instead of a prism.
  • the lens and the substrate reach the apex of the lens, the light collecting efficiency decreases, so that the effect of improving the brightness is limited. There was no.
  • An object of the present invention is to provide an optical member having an improved viewing angle and a backlight unit including the same.
  • the present invention is a first preferred embodiment, the first diffusion sheet; A second diffusion sheet stacked on the first diffusion sheet; And a composite optical sheet laminated on the second diffusion sheet, wherein the composite optical sheet comprises: a base layer; A structure layer formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And it is formed on the lower surface of the base layer, and provides an optical member comprising a back coating layer in which particles are dispersed.
  • the triangular cross section in which the mountain portion is curved according to the embodiment may have a height / pitch (H / P) of 0.4 or less.
  • the triangular cross section of the curved portion of the mountain according to the embodiment may have a pitch of 5 ⁇ 20 ⁇ m.
  • the triangular cross section of the curved portion of the mountain according to the embodiment may have a curvature (round) of 5 ⁇ m ⁇ 14 ⁇ m.
  • the structural layer according to the embodiment may have a refractive index (R.I.) of 1.47 to 1.55.
  • the back coating layer according to the embodiment may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin.
  • the back coating layer according to the embodiment may include 2 to 10 parts by weight of particles selected from organic particles, inorganic particles and mixtures thereof with respect to 100 parts by weight of the binder resin.
  • the present invention also provides a backlight unit including the optical member as a second preferred embodiment.
  • the optical member according to the present invention exhibits an excellent concealability and an improved viewing angle.
  • FIG. 1 is a longitudinal sectional view of a composite optical sheet according to the present invention.
  • Figure 2 shows a top view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet structure layer according to the present invention.
  • Figure 3 schematically shows a longitudinal section of the lenticular pattern formed on the composite optical sheet structure layer according to the present invention.
  • Figure 4 shows a bottom view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet back coating layer according to the present invention.
  • Example 5 is a graph showing measurement results of left and right viewing angles (a) and up and down viewing angles (b) of the sheets of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
  • Example 6 is a photograph taken whether the side lobe of the sheet of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
  • the present invention is a first diffusion sheet (1); A second diffusion sheet 2 stacked on the first diffusion sheet 1; And a composite optical sheet 3 laminated on the second diffusion sheet 2, wherein the composite optical sheet comprises: a base layer 10; A structural layer 20 formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And a back coating layer 30 formed on a lower surface of the base layer 10 and having particles dispersed therein (FIG. 1).
  • the composite optical sheet ensures concealment of the viewing angle.
  • the viewing angle can be improved.
  • the isosceles triangle of the composite optical sheet is a part that acts like a prism and not only focuses the light in front, but also widens the left and right viewing angles to increase the half-angle angle than the existing diffusion sheet, and the curve of the vertex of the isosceles triangle scatters the light. It improves side lobe of vertical angle, which is a problem of concealment and composite prism sheet.
  • a back coating on the back to secure additional concealment, the same appearance as the diffusion sheet.
  • the base layer may be a resin selected from the group consisting of polyethylene terephthalate resin, polymethyl methacrylate resin, polycarbonate resin, polypropylene resin, polyethylene resin, polystyrene resin and styrene-acrylic copolymer resin, but the composite optical
  • the resin is not limited so long as it can exhibit properties such as durability of the sheet.
  • the structure layer is not particularly limited as long as the material is a light-transmissive curable resin. That is, any polymer resin containing ultraviolet curable resin or thermosetting resin can be used without limitation. Examples thereof include unsaturated fatty acid esters, aromatic vinyl compounds, unsaturated fatty acids and their derivatives, unsaturated dibasic acids and their derivatives, meta, and the like. Vinyl cyanide compounds such as chloronitrile and the like can be used.
  • the structural layer may have a refractive index (RI) of 1.47 to 1.55, and if the refractive index of the structural layer is less than 1.47, there is a problem of deterioration in luminance, and if the structure layer is more than 1.55, the price is increased, and the structure layer is manufactured. High viscosity may cause problems in improving mass productivity.
  • RI refractive index
  • the structural layer has a lenticular pattern whose shape of the longitudinal section is an isosceles triangle with a curved mountain part (FIG. 2A), and the shape of the longitudinal section of the structural layer pattern may be an isosceles triangle with a curved mountain part. ((B) and (c) of FIG. 2). At this time, the angles of the two vertices contacting the base of the isosceles triangle may be 45 degrees, respectively.
  • the triangular cross section of the mountain portion is curved may have a height / pitch (H / P) of 0.4 or less, preferably 0.2 to 0.4. If the height / pitch is greater than 0.4, there is a problem that the side lobe occurs in the vertical angle, and if less than 0.2, the luminance is reduced.
  • the peak of the triangle cross section of the curved portion may have a pitch of 5 ⁇ 20 ⁇ m, if the pitch is less than 5 when producing a pattern roll processing machine to secure the quality of the optical sheet by the generation of white spots and S / C becomes difficult. If the thickness is more than 20 ⁇ m, the amount of the resin required for fabricating the structural layer increases, thereby increasing the price (FIG. 3).
  • the curvature may be 5 ⁇ 14 ⁇ m, if the curvature is less than 5 ⁇ m Side Lobe occurs at the upper and lower angle, and if it exceeds 14 ⁇ m brightness is reduced.
  • the curvature means a radius r of a circle having a curve of a triangular cross section in which the peak is curved.
  • the back coating layer may be a binder resin in which the material is dispersed.
  • the binder resin is a transparent organic binder resin, it is possible to use a resin having good adhesion to the substrate layer and good compatibility with the particles, unsaturated polyester, methyl methacrylate, ethyl methacrylate, iso Butyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methirol acryl Acrylic resins selected from the group consisting of amide, glycidyl methacrylate and ethyl acrylate; Urethane-based resins; Epoxy resins; And melamine-based resins.
  • the particles are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, iso
  • the particles are silicon oxide; Aluminum oxide; Titanium oxide; Zirconium oxide; And it may be an inorganic particle made of one or more materials selected from the group consisting of
  • the back coating layer may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin as described above, if the content of the particles is less than 2 parts by weight, the concealability is lowered, if more than 10 parts by weight to ensure the concealability Is advantageous, but a decrease in luminance occurs.
  • the back coating layer may have a shape in which the particles protrude, and when the protrusion of the particles is large, it may cause damage to the sheet laminated by the protruding particles, so that the protruding portion of the particles does not exceed 50% of the particle diameter. It may be protruding (FIG. 4).
  • the diameter of the particles may be 2 ⁇ 5um, if the diameter of the particles less than 2um buried in the Bineder is not secured, and if more than 5um may cause damage to the sheet when the sheet is laminated.
  • a back coating layer is formed by applying a particle dispersion layer made of a binder resin and particles to one surface of the substrate layer, and a composite layer is formed on the back surface of the substrate layer by using a curable resin. Sheets can be produced.
  • a back coating layer is formed on the back layer of the sheet, and a structural layer in which a lenticular pattern is arranged on the front layer of the sheet is formed to secure concealment and improve the viewing angle.
  • a structural layer in which a lenticular pattern is arranged on the front layer of the sheet is formed to secure concealment and improve the viewing angle. Can be.
  • each of the first diffusion sheet and the second diffusion sheet includes a substrate layer and a diffusion layer formed on at least one surface of the substrate layer, and any diffusion sheet used in the art may be used without limitation.
  • the present invention also relates to a backlight unit including the optical member as described above, and is suitable for applying to a monitor to improve the viewing angle.
  • the polyethylene terephthalate film (Kolon Industries) of 100 micrometers was prepared.
  • the back coating layer crude liquid was applied to the lower surface of the base layer by using gravure, and thermally cured at 100 ° C. for 30 seconds, the maximum thickness of which the particles protruded was 6 ⁇ m, and the thickness of the resin containing no particles was 4 ⁇ m.
  • the back coating layer was formed as much as possible.
  • the back coating layer crude liquid is prepared by dispersing 4 parts by weight of PMMA particles in 100 parts by weight of an acrylic binder resin.
  • urethane acrylate Miwon Special Chemical, Miramer MU3603
  • phenoxyethyl acrylate Sartomer, SR339
  • the base layer on which the back coating layer was not formed was coated on the back side of the structure layer forming composition, placed on the frame of the lenticular pattern roller, and described on an ultraviolet irradiation device (Fusion, 600W / inch2) equipped with a Type-D bulb.
  • an ultraviolet irradiation device Fusion, 600W / inch2
  • a lenticular pattern was formed in a linear array to prepare a composite optical sheet.
  • the shape of the mold is a lenticular pattern having a triangular longitudinal cross-section of the peak as shown in Table 1, the pitch of the longitudinal cross-section was 20um, a composite optical sheet having a height of 7.5um was prepared.
  • the composite optical sheet was laminated on the two diffusion sheets to prepare an optical member.
  • An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 10 ⁇ m and the height was 3.8 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1 except that the longitudinal section pitch of the lenticular pattern formed on the structural layer was 30 ⁇ m and the height was 11.7 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1, except that a diffusion sheet (XC210, Kolon Industries) was used instead of the composite optical sheet.
  • An optical member was manufactured in the same manner as in Example 1, except that a composite prism sheet (LF343, Kolon Industries) was used instead of the composite optical sheet.
  • a composite prism sheet LF343, Kolon Industries
  • the longitudinal section pitch of the lenticular pattern formed in the structural layer is 20 ⁇ m, except that the height is 9.5 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1.
  • An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 20 ⁇ m and the height was 3.4 ⁇ m.
  • the optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for a liquid crystal display panel, and fixed at 13 points by using a luminance meter (model name: BM-7A, Japan TOPCON). Luminance and color coordinates were measured, and the luminance ratio was recorded as a ratio with the luminance of the measured luminance comparative example 1, and the color coordinates recorded an average of 13 points.
  • BLU backlight unit
  • the optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for the liquid crystal display panel, and faced at the front of the BLU using a luminance meter (model name: BM-7A, Japan TOPCON).
  • BLU backlight unit
  • BM-7A BM-7A, Japan TOPCON
  • the light emitting members prepared in Examples and Comparative Examples were mounted and fixed on a backlight unit for a 21.5-inch liquid crystal display panel, and were mounted at -80 degrees to 80 degrees in the vertical direction using a luminance meter (model name: BM-7A, Japan TOPCON).
  • the luminance is measured at intervals of 5 degrees in the range of degrees, and when the luminance rises in the range of the viewing angle of -50 degrees or less or 50 degrees or more, the side lobe is generated.
  • Example 1 Longitudinal section of the composite optical sheet structure layer (triangular with a curved mountain) Pitch (P, ⁇ m) Height (H, ⁇ m) Height / Pitch (H / P) Curvature ( ⁇ m)
  • Example 1 20 7.5 0.38 6
  • Example 2 10 3.8 0.38 3
  • Example 3 30 11.7 0.39 8
  • Comparative Example 1 Diffusion Prism Sheet (XC210, Kolon Industries) Comparative Example 2 Composite Prism Sheet (LF343, Kolon Industries) Comparative Example 3 20 9 0.46 2 Comparative Example 4 20 3.4 0.17 16

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

Abstract

The present invention relates to an optical member and a backlight unit comprising the same and, more particularly, to an optical member having an improved viewing angle and a back light unit comprising the same, the optical member comprising: a first diffusion sheet; a second diffusion sheet stacked on the first diffusion sheet; and a complex optical sheet stacked on the second diffusion sheet, wherein the complex optical sheet comprises: a base layer; a structural layer which is formed on the top surface of the base layer and has a lenticular pattern of which the longitudinal section has the shape of an equilateral triangle with the rounded top; and a back coating layer which is formed on the bottom surface of the base layer and in which particles are dispersed.

Description

광학부재 및 이를 포함하는 백라이트 유닛Optical member and backlight unit including the same
본 발명은 액정 디스플레이 장치(Liquid Crystal Display)에 사용되는 광학부재 및이를 포함하는 백라이트 유닛에 관한 것이다.The present invention relates to an optical member used in a liquid crystal display and a backlight unit including the same.
광학용 디스플레이 소자로 사용되는 액정디스플레이는 외부 광원의 투과율을 조절하여 화상을 나타내는 간접 발광 방식으로 광원장치인 백라이트 유닛이 액정디스플레이의 특성을 결정하는 중요한 부품으로 사용되고 있다.A liquid crystal display used as an optical display element is an indirect light emission method of controlling the transmittance of an external light source to display an image, and a backlight unit, which is a light source device, is used as an important component for determining characteristics of a liquid crystal display.
백라이트 유닛은 LED(light Emmiting diode) 등의 광원을 사용하여 방출되는 빛을 순차적으로 도광판, 확산 시트 및 프리즘 시트를 통과시켜 액정 패널에 도달하게 한다. 여기서, 도광판은 엣지형 백라이트 유닛의 경우 장착되는 것으로, 광원으로부터 방출되는 광이 평면 형태인 액정 패널의 전면에 분포되도록 전달하며, 확산 시트와 같은 확산 부재는 화면 전면에 걸쳐 균일한 광세기를 얻을 수 있도록 하는 동시에 확산 부재 하부에 장착된 광원 등의 장치가 전면에서 보이지 않도록 은폐하는 기능을 수행한다. 한편, 프리즘 시트는 확산 부재를 거친 다양한 방향의 광선을 관측자가 화상을 인식하기에 적합한 시야각(θ) 범위 내로 변환되도록 하는 광 경로 제어 기능을 수행하여 집광되도록 한다. 또한, 도광판 하부에는 액정 패널로 전달되지 못하고 경로를 벗어난 광을 다시 반사하여 이용될 수 있도록 함으로써 광원의 이용 효율을 증가시키기 위한 반사시트가 구비된다.The backlight unit sequentially passes the light emitted using a light source such as a light emitting diode (LED) through the light guide plate, the diffusion sheet, and the prism sheet to reach the liquid crystal panel. Here, the light guide plate is mounted in the case of an edge type backlight unit, and transmits the light emitted from the light source to be distributed over the front surface of the liquid crystal panel in a flat shape, and a diffusion member such as a diffusion sheet obtains uniform light intensity across the entire screen. And a device such as a light source mounted to the lower part of the diffusion member so as to be hidden from the front. On the other hand, the prism sheet performs a light path control function for converging light rays from various directions passing through the diffusion member within a range of viewing angle θ suitable for the viewer to recognize the image to be collected. In addition, the lower portion of the light guide plate is provided with a reflective sheet for increasing the use efficiency of the light source by being able to reflect the light that is not delivered to the liquid crystal panel off the path again.
상기 프리즘 시트는 종래 정면 방향의 휘도 향상을 위하여 45°의 경사면을 가지고 있는 삼각 어레이(array) 형태의 구조를 하고 있다. 따라서 동일한 형태의 프리즘에서 출사되는 각이 어레이마다 동일하므로, 삼각형의 모서리 부위의 작은 뭉개짐이 발생하거나 경사면에 발생하는 미세한 스크래치 등에 의해서도 손상된 부위와 정상부위간의 출사되는 광경로의 차이로 인하여 불량으로 처리하게 된다. 그러므로 프리즘 시트의 생산시 미세한 이물 유입도 허락되지 않으며, 또한 미세한 불량에 의해서도 위치에 따라서는 생산된 프리즘 시트 전면을 사용하지 못하게 되는 경우가 발생하기도 한다. 이는 생산성 저하를 불러오고 곧 원가 상승의 부담으로 작용하게 된다. 또한 백라이트 유닛에 작업시 인력에 의하여 여러 장의 적층작업이 이루어지게 되는데, 프리즘 시트 역시 손으로 작업 시 상당한 주의를 요하게 되고, 백라이트 유닛의 조립에 소요되는 TACT time의 증가 및 많은 인력 수급으로 인하여 백라이트 유닛의 공급 단가의 상승으로 이어지게 된다.The prism sheet has a triangular array structure having a 45 ° inclined surface for improving the brightness in the front direction. Therefore, since the angles emitted from the same type of prism are the same for each array, even if a small crush occurs at the corners of the triangle or minute scratches occur on the inclined surface, the defects are caused by the difference in the light paths emitted between the damaged parts and the normal parts. Will be processed. Therefore, fine foreign matters are not allowed in the production of the prism sheet, and in some cases, even the minute defects make it impossible to use the entire surface of the produced prism sheet. This leads to a decrease in productivity, which in turn is a burden of cost increase. In addition, when laminating the work on the backlight unit, several laminations are performed by manpower. The prism sheet also requires considerable attention when working by hand, and the back light unit is increased due to the increase in the TACT time required for assembling the backlight unit and the supply of manpower. This will lead to an increase in the supply cost.
종래 프리즘 꼭지각의 손상을 방지하고 보호필름을 제거하기 위하여 프리즘의 꼭지각을 라운딩 처리한 프리즘이 생산되고 있으나 라운딩 처리되지 않은 프리즘에 비하여 휘도가 저하되면서 시야각이 좁아지는 문제는 개선되지 않는 점이 있었다.In order to prevent damage to the prismatic angle of the prism and to remove the protective film, a prism obtained by rounding the vertices of the prism has been produced. However, there is a problem that the viewing angle is not narrowed while the luminance is lowered as compared with the unrounded prism.
이에 최근에는 프리즘 대신 단면이 반구형인 렌즈를 이용하여 집광형 시트를 제작하는 경우가 증가하고 있는데, 렌즈와 기재가 닿는 부분에서 렌즈의 정점으로 올라갈수록 집광 효율이 낮아져 휘도 향상의 효과는 제한적일 수 밖에 없었다.In recent years, a light collecting sheet is manufactured using a lens having a hemispherical cross-section instead of a prism. However, as the lens and the substrate reach the apex of the lens, the light collecting efficiency decreases, so that the effect of improving the brightness is limited. There was no.
한편, 최근에는 백라이트 유닛의 가격을 인하시키기 위하여 확산시트 3매를 적층한 광학부재를 사용하기도 하나, 시야각이 저하되는 문제점이 있고, 확산시트 2매에 복합프리즘시트를 적층한 광학부재를 사용하기도 하나, 고가이고 Side Lobe가 문제되기도 한다. On the other hand, in order to reduce the price of the backlight unit recently, an optical member having three stacked sheets is used, but there is a problem that the viewing angle is lowered, and an optical member having laminated composite prism sheets on two diffusion sheets is used. However, it is expensive and the side lobe may be a problem.
본 발명은 시야각이 개선된 광학부재 및 이를 포함하는 백라이트 유닛을 제공하고자 한다.An object of the present invention is to provide an optical member having an improved viewing angle and a backlight unit including the same.
이에 본 발명은 바람직한 제1 구현예로서, 제1 확산시트; 상기 제1 확산시트 상에 적층된 제2 확산시트; 및 상기 제2 확산시트 상에 적층된 복합 광학시트를 포함하는 광학부재로서, 상기 복합광학시트는 기재층; 상기 기재층의 상면에 형성되며, 그 종단면의 형상은 산 부분이 곡선인 이등변 삼각형인 렌티큘러 패턴이 배열된 구조층; 및 상기 기재층의 하면에 형성되며, 입자가 분산되어 있는 백코팅층을 포함하는 것임을 특징으로 하는 광학부재를 제공한다.Accordingly, the present invention is a first preferred embodiment, the first diffusion sheet; A second diffusion sheet stacked on the first diffusion sheet; And a composite optical sheet laminated on the second diffusion sheet, wherein the composite optical sheet comprises: a base layer; A structure layer formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And it is formed on the lower surface of the base layer, and provides an optical member comprising a back coating layer in which particles are dispersed.
상기 구현예에 의한 산 부분이 곡선인 삼각형 단면은 그 높이/피치(height/pitch, H/P)가 0.4이하인 것일 수 있다.The triangular cross section in which the mountain portion is curved according to the embodiment may have a height / pitch (H / P) of 0.4 or less.
상기 구현예에 의한 산 부분이 곡선인 삼각형 단면은 그 피치가 5~20㎛인 것일 수 있다.The triangular cross section of the curved portion of the mountain according to the embodiment may have a pitch of 5 ~ 20㎛.
상기 구현예에 의한 산 부분이 곡선인 삼각형 단면은 곡선의 곡률(round)이 5㎛ ~14㎛ 인 것일 수 있다.The triangular cross section of the curved portion of the mountain according to the embodiment may have a curvature (round) of 5㎛ ~ 14㎛.
상기 구현예에 의한 구조층은 그 굴절률(refractive index, R.I.)이 1.47~1.55인 것일 수 있다. The structural layer according to the embodiment may have a refractive index (R.I.) of 1.47 to 1.55.
상기 구현예에 의한 백코팅층은 바인더 수지 100중량부에 대하여 입자 2~10 중량부를 포함하는 것일 수 있다.The back coating layer according to the embodiment may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin.
상기 구현예에 의한 백코팅층은 바인더 수지 100중량부에 대하여 유기 입자, 무기 입자 및 이들의 혼합물 중 선택되는 입자 2 ~ 10중량부를 포함하는 것일 수 있다.The back coating layer according to the embodiment may include 2 to 10 parts by weight of particles selected from organic particles, inorganic particles and mixtures thereof with respect to 100 parts by weight of the binder resin.
본 발명은 또한 바람직한 제2 구현예로서, 상기 광학부재를 포함하는 백라이트 유닛을 제공한다.The present invention also provides a backlight unit including the optical member as a second preferred embodiment.
본 발명에 따른 광학부재는 은폐성이 우수하면서도 시야각이 개선된 효과를 나타낸다. The optical member according to the present invention exhibits an excellent concealability and an improved viewing angle.
도 1은 본 발명에 따른 복합광학시트의 종단면도이다.1 is a longitudinal sectional view of a composite optical sheet according to the present invention.
도 2는 본 발명에 따른 복합광학시트 구조층의 상면도(a), 종단면도(b) 및 사시도(c)를 나타낸 것이다.Figure 2 shows a top view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet structure layer according to the present invention.
도 3은 본 발명에 따른 복합광학시트 구조층에 형성된 렌티큘러 패턴의 종단면을 모식적으로 나타낸 것이다.Figure 3 schematically shows a longitudinal section of the lenticular pattern formed on the composite optical sheet structure layer according to the present invention.
도 4는 본 발명에 따른 복합광학시트 백코팅층의 저면도(a), 종단면도(b) 및 사시도(c)를 나타낸 것이다.Figure 4 shows a bottom view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet back coating layer according to the present invention.
도 5는 본 발명의 실시예 1, 비교예 1 및 비교예 2의 시트의 좌우시야각(a) 및 상하시야각(b)의 측정결과를 그래프로 나타낸 것이다.5 is a graph showing measurement results of left and right viewing angles (a) and up and down viewing angles (b) of the sheets of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
도 6은 본 발명의 실시예 1, 비교예 1 및 비교예 2의 시트의 사이드로브 발생 여부를 사진으로 찍은 것이다.6 is a photograph taken whether the side lobe of the sheet of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명은 제1 확산시트(1); 상기 제1 확산시트(1) 상에 적층된 제2 확산시트(2); 및 상기 제2 확산시트(2) 상에 적층된 복합광학시트(3)를 포함하는 광학부재로서, 상기 복합광학시트는 기재층(10); 상기 기재층의 상면에 형성되며, 그 종단면의 형상은 산 부분이 곡선인 이등변 삼각형인 렌티큘러 패턴이 배열된 구조층(20); 및 상기 기재층(10)의 하면에 형성되며, 입자가 분산되어 있는 백코팅층(30)을 포함하는 것임을 특징으로 하는 복합광학시트에 관한 것이다 (도 1).The present invention is a first diffusion sheet (1); A second diffusion sheet 2 stacked on the first diffusion sheet 1; And a composite optical sheet 3 laminated on the second diffusion sheet 2, wherein the composite optical sheet comprises: a base layer 10; A structural layer 20 formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And a back coating layer 30 formed on a lower surface of the base layer 10 and having particles dispersed therein (FIG. 1).
본 발명은 2매의 확산시트 상에 상술한 바와 같은 형태의 패턴이 배열된 구조층을 포함하는 집광시트가 적층되어 있는 구조적인 특징으로 인하여, 이 복합광학시트는 시야각을 은폐성을 확보함과 동시에 시야각을 개선할 수 있다. 복합광학시트의 이등변 삼각형은 프리즘과 같은 역할을 하는 부분으로 광을 정면으로 집광 시킬 뿐만 아니라, 좌우 시야각을 넓혀 반치각을 기존 확산 시트보다 증가 시키며, 이등변 삼각형의 꼭지각 부분의 곡선은 빛을 산란시켜 은폐성과 복합프리즘 시트의 문제점인 상하시야각의 Side Lobe를 개선하게 된다. 또한 배면에 백코팅을 포함하여 은폐성을 추가 확보하여 확산시트와 같은 외관을 같게 된다. According to the present invention, due to the structural feature in which a light collecting sheet including a structural layer in which the pattern of the above-described pattern is arranged on two diffusion sheets is laminated, the composite optical sheet ensures concealment of the viewing angle. At the same time, the viewing angle can be improved. The isosceles triangle of the composite optical sheet is a part that acts like a prism and not only focuses the light in front, but also widens the left and right viewing angles to increase the half-angle angle than the existing diffusion sheet, and the curve of the vertex of the isosceles triangle scatters the light. It improves side lobe of vertical angle, which is a problem of concealment and composite prism sheet. In addition, by including a back coating on the back to secure additional concealment, the same appearance as the diffusion sheet.
기재층은 그 재질이 폴리에틸렌테레프탈레이트 수지, 폴리메틸메타크릴레이트 수지, 폴리카보네이트 수지, 폴리프로필렌 수지, 폴리에틸렌 수지, 폴리스티렌 수지 및 스티렌-아크릴계 공중합 수지로 구성된 군에서 선택되는 수지일 수 있으나, 복합광학시트의 내구성 등과 같은 특성을 나타낼 수 있도록 하는 수지라면 이에 제한되는 것은 아니다.The base layer may be a resin selected from the group consisting of polyethylene terephthalate resin, polymethyl methacrylate resin, polycarbonate resin, polypropylene resin, polyethylene resin, polystyrene resin and styrene-acrylic copolymer resin, but the composite optical The resin is not limited so long as it can exhibit properties such as durability of the sheet.
구조층은 그 재질이 광투과성의 경화성 수지라면 특별히 제한되지 않는다. 즉, 자외선 경화성 수지 혹은 열경화성 수지를 포함하는 고분자 수지이면 제한되지 않고 사용 가능한데, 예를 들면, 불포화 지방산 에스테르, 방향족 비닐 화합물, 불포화 지방산과 그 유도체 불포화 이가산(unsaturated dibasic acid)과 그 유도체, 메타크릴로나이트릴과 같은 비닐 시아나이드(cyanide) 화합물 등이 사용될 수 있다.The structure layer is not particularly limited as long as the material is a light-transmissive curable resin. That is, any polymer resin containing ultraviolet curable resin or thermosetting resin can be used without limitation. Examples thereof include unsaturated fatty acid esters, aromatic vinyl compounds, unsaturated fatty acids and their derivatives, unsaturated dibasic acids and their derivatives, meta, and the like. Vinyl cyanide compounds such as chloronitrile and the like can be used.
또한, 구조층은 그 굴절률(refractive index, R.I.)이 1.47~1.55 일 수 있으며, 구조층의 굴절률이 1.47 미만이면 휘도 저하의 문제가 있고, 1.55 초과이면 가격이 상승되고, 구조층을 제조할 때 점도가 높아 양산성 향상에 문제가 발생할 수 있다. In addition, the structural layer may have a refractive index (RI) of 1.47 to 1.55, and if the refractive index of the structural layer is less than 1.47, there is a problem of deterioration in luminance, and if the structure layer is more than 1.55, the price is increased, and the structure layer is manufactured. High viscosity may cause problems in improving mass productivity.
구조층은 그 종단면의 형상은 산 부분이 곡선인 이등변 삼각형인 렌티큘러 패턴이 있으며(도 2의 (a)), 상기 구조층의 패턴에서 그 종단면의 형상은 산 부분인 곡선인 이등변 삼각형일 수 있다(도 2의 (b) 및 (c)). 이때, 이등변 삼각형의 밑변에 접하는 양 꼭지각의 각도는 각각 45도일 수 있다.The structural layer has a lenticular pattern whose shape of the longitudinal section is an isosceles triangle with a curved mountain part (FIG. 2A), and the shape of the longitudinal section of the structural layer pattern may be an isosceles triangle with a curved mountain part. ((B) and (c) of FIG. 2). At this time, the angles of the two vertices contacting the base of the isosceles triangle may be 45 degrees, respectively.
상기 산 부분이 곡선인 삼각형 단면은 그 높이/피치(height/pitch, H/P)가 0.4이하인 것일 수 있으며, 바람직하게는 0.2~0.4 인 것일 수 있다. 상기 높이/피치가 0.4 초과이면 상하시야각에서 Side lobe가 발생하는 문제가 있으며, 0.2 미만이면 휘도가 감소되는 문제가 있다.The triangular cross section of the mountain portion is curved may have a height / pitch (H / P) of 0.4 or less, preferably 0.2 to 0.4. If the height / pitch is greater than 0.4, there is a problem that the side lobe occurs in the vertical angle, and if less than 0.2, the luminance is reduced.
여기서, 상기 산 부분이 곡선인 삼각형 단면은 그 피치가 5~20㎛일 수 있으며, 상기 피치가 5미만이면 패턴롤 가공기로 제작시 백점과 S/C의 발생으로 광학시트의 품질을 확보하기가 어렵게 된다. 20㎛ 초과이면 구조층 제조에 필요한 수지의 양이 증가하여 가격이 상승하는 문제가 있다 (도 3).Here, the peak of the triangle cross section of the curved portion may have a pitch of 5 ~ 20㎛, if the pitch is less than 5 when producing a pattern roll processing machine to secure the quality of the optical sheet by the generation of white spots and S / C Becomes difficult. If the thickness is more than 20 μm, the amount of the resin required for fabricating the structural layer increases, thereby increasing the price (FIG. 3).
한편, 상기 산 부분이 곡선이 삼각형 단면에서, 곡률은 5~14㎛일 수 있으며, 곡률이 5㎛미만이면 상하시야각에서 Side Lobe가 발생하며, 14㎛ 초과이면 휘도가 감소하게 된다. 여기서 곡률이란 상기 산 부분이 곡선인 삼각형 단면의 곡선을 원주의 일부로 하는 원의 반지름(r)을 의미한다.On the other hand, the curved portion of the mountain in the triangular cross section, the curvature may be 5 ~ 14㎛, if the curvature is less than 5㎛ Side Lobe occurs at the upper and lower angle, and if it exceeds 14㎛ brightness is reduced. Here, the curvature means a radius r of a circle having a curve of a triangular cross section in which the peak is curved.
백코팅층은 그 재질이 입자가 분산되어 있는 바인더 수지일 수 있다. 구체적으로, 상기 바인더 수지는 투명한 유기 바인더 수지로서, 기재층과 접착성이 좋으면서 입자들과의 상용성이 좋은 수지를 사용할 수 있으며, 불포화폴리에스터, 메틸메타크릴레이트, 에틸메타크릴레이트, 이소부틸메타크릴레이트, 노말부틸메타크릴레이트, 노말부틸메틸메타크릴레이트, 아크릴산, 메타크릴산, 히드록시에틸메타크릴레이트, 히드록시프로필메타크릴레이트, 히드록시 에틸아크릴레이트, 아크릴아미드, 메티롤아크릴아미드, 글리시딜메타크릴레이트 및 에틸아크릴레이트로 구성된 군에서 선택된 아크릴계 수지; 우레탄계 수지; 에폭시계 수지; 및 멜라민계 수지 중 선택되는 것일 수 있다.The back coating layer may be a binder resin in which the material is dispersed. Specifically, the binder resin is a transparent organic binder resin, it is possible to use a resin having good adhesion to the substrate layer and good compatibility with the particles, unsaturated polyester, methyl methacrylate, ethyl methacrylate, iso Butyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methirol acryl Acrylic resins selected from the group consisting of amide, glycidyl methacrylate and ethyl acrylate; Urethane-based resins; Epoxy resins; And melamine-based resins.
또한, 상기 입자는 메틸메타크릴레이트, 아크릴산, 메타크릴산, 히드록시에틸메타크릴레이트, 히드록시프로필메타크릴레이트, 아크릴아미드, 메티롤아크릴아미드, 글리시딜메타크릴레이트, 에틸아크릴레이트, 이소부틸아크릴레이트, 노말부틸아크릴레이트 및 2-에틸헥실아크릴레이트 중합체로 구성된 군에서 선택되는 아크릴계 수지로 제조된 아크릴계 입자; 폴리에틸렌, 폴리스티렌 및 폴리프로필렌으로 구성된 군에서 선택되는 올레핀계 수지로 제조된 올레핀계 입자; 및 아크릴계 수지와 올레핀계 수지의 공중합체로 제조된 단일 중합체 입자 위에 다른 단량체를 씌워서 제조된 다층 다성분계 입자로 구성된 군에서 선택되는 유기계 입자일 수 있다. 또한, 상기 입자는 산화규소; 산화알루미늄; 산화티타늄; 산화지르코늄; 및 불화마그네슘으로 구성된 군에서 선택되는 1종 이상의 재질로 제조된 무기계 입자일 수 있다.In addition, the particles are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, iso Acrylic particles made of an acrylic resin selected from the group consisting of butyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate polymer; Olefinic particles made of an olefinic resin selected from the group consisting of polyethylene, polystyrene and polypropylene; And it may be an organic particle selected from the group consisting of multi-layer multi-component particles prepared by coating another monomer on a single polymer particles made of a copolymer of an acrylic resin and an olefin resin. In addition, the particles are silicon oxide; Aluminum oxide; Titanium oxide; Zirconium oxide; And it may be an inorganic particle made of one or more materials selected from the group consisting of magnesium fluoride.
상기 백코팅층은 전술한 바와 같은 바인더 수지 100중량부에 대하여 입자 2~10 중량부를 포함하는 것일 수 있으며, 입자의 함량이 2 중량부 미만이면 은폐성이 저하되고, 10 중량부 초과이면 은폐성의 확보에는 유리하나 휘도의 저하가 발생하게 된다.The back coating layer may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin as described above, if the content of the particles is less than 2 parts by weight, the concealability is lowered, if more than 10 parts by weight to ensure the concealability Is advantageous, but a decrease in luminance occurs.
한편, 상기 백코팅층은 입자가 돌출되어 있는 형상일 수 있으며, 입자의 돌출이 많은 경우 돌출된 입자에 의해 적층되는 시트의 손상을 가져올 수 있으므로, 입자의 돌출부분이 입자 직경의 50%를 넘지 않도록 돌출되는 것일 수 있다 (도 4).Meanwhile, the back coating layer may have a shape in which the particles protrude, and when the protrusion of the particles is large, it may cause damage to the sheet laminated by the protruding particles, so that the protruding portion of the particles does not exceed 50% of the particle diameter. It may be protruding (FIG. 4).
이때, 상기 입자의 직경은 2 ~ 5um일 수 있으며, 입자의 직경이 2um 미만이면 입자가 Bineder에 묻혀 은폐성이 확보되지 않으며, 5um 초과이면 시트가 적층이 되었을 때 시트의 손상을 발생할 수 있다. In this case, the diameter of the particles may be 2 ~ 5um, if the diameter of the particles less than 2um buried in the Bineder is not secured, and if more than 5um may cause damage to the sheet when the sheet is laminated.
본 발명에 따른 복합광학시트는 상기 기재층의 일면에 바인더 수지와 입자로 이루어진 입자분산층을 도포하여 백코팅층을 형성하고, 상기 기재층의 이면에 경화성 수지를 이용하여 구조층을 형성함으로써 복합광학시트를 제조할 수 있다.In the composite optical sheet according to the present invention, a back coating layer is formed by applying a particle dispersion layer made of a binder resin and particles to one surface of the substrate layer, and a composite layer is formed on the back surface of the substrate layer by using a curable resin. Sheets can be produced.
이와 같이 제조된 복합광학시트는 시트의 배면(back layer)에 백코팅층이 형성되고, 시트의 정면(front layer)에 렌티큘러 패턴을 배열된 구조층이 형성되어 은폐성을 확보하는 동시에 시야각을 개선시킬 수 있다.In the composite optical sheet manufactured as described above, a back coating layer is formed on the back layer of the sheet, and a structural layer in which a lenticular pattern is arranged on the front layer of the sheet is formed to secure concealment and improve the viewing angle. Can be.
본 발명에 있어서, 제1 확산시트 및 제2 확산시트는 각각 기재층 및 상기 기재층의 적어도 일면에 형성된 확산층을 포함하며, 당업계에서 사용되는 확산시트라면 제한없이 사용할 수 있다.In the present invention, each of the first diffusion sheet and the second diffusion sheet includes a substrate layer and a diffusion layer formed on at least one surface of the substrate layer, and any diffusion sheet used in the art may be used without limitation.
본 발명은 또한, 전술한 바와 같은 광학부재를 포함하는 백라이트 유닛에 관한 것으로서, 모니터에 적용하여 시야각을 개선시키기에 적합하다.The present invention also relates to a backlight unit including the optical member as described above, and is suitable for applying to a monitor to improve the viewing angle.
이하 본 발명을 구체적인 실시예를 통해 설명하겠는 바, 본 발명이 이들 실시예에 한정되지 않고 기술적 사상이 허용되는 범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의하여 다양하게 변경되어 실시될 수 있음은 물론이다.Hereinafter, the present invention will be described through specific examples, and the present invention is not limited to these embodiments, and various changes are made by those skilled in the art to which the present invention pertains within the scope of the technical idea. Of course, it can be carried out.
실시예 1Example 1
기재층으로 100㎛의 폴리에틸렌테레프탈레이트 필름(코오롱 인더스트리社)을 준비하였다.As a base material layer, the polyethylene terephthalate film (Kolon Industries) of 100 micrometers was prepared.
상기 기재층의 하면에 그라비아를 사용하여 백코팅층 조액을 도포하고, 100℃에서 30초간 열경화시켜, 입자가 돌출된 최대 두께가 6㎛이고, 입자를 포함하지 않는 수지만의 두께가 4㎛이 되도록 백코팅층을 형성하였다. 이때, 상기 백코팅층 조액은 아크릴계열의 바인더 수지 100중량부에 PMMA 입자 4중량부를 분산시켜 제조한 것이다. The back coating layer crude liquid was applied to the lower surface of the base layer by using gravure, and thermally cured at 100 ° C. for 30 seconds, the maximum thickness of which the particles protruded was 6 μm, and the thickness of the resin containing no particles was 4 μm. The back coating layer was formed as much as possible. In this case, the back coating layer crude liquid is prepared by dispersing 4 parts by weight of PMMA particles in 100 parts by weight of an acrylic binder resin.
상기 기재층의 일면에 전체조성 100중량부에 대해서 우레탄 아크릴레이트(미원스페샬케미컬, Miramer MU3603) 60중량부, 페녹시에틸아클릴레이트(Sartomer, SR339) 20중량부, 오르소 페닐페녹시에틸아크릴레이트(미원스페샬케리컬, Miramer M1142) 20중량부, 광개시제 2,4,6-트리메틸벤조일 디페닐포스틴옥사이드 1.5중량부(Ciba special chemicals, Darocur TPO, 광개시제 1-하이드록시-사이클로헥실-페닐케톤(Ciba special chemicals, Irgarcure 184), 첨가제 bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate 2.0중량부를 혼합하여 구조층 형성용 조성물을 제조하였다. 60 parts by weight of urethane acrylate (Miwon Special Chemical, Miramer MU3603), 20 parts by weight of phenoxyethyl acrylate (Sartomer, SR339), and ortho phenylphenoxyethyl acryl on one surface of the base layer with respect to 100 parts by weight of the total composition. 20 parts by weight of latex (Miwon Special Chemical, Miramer M1142), 1.5 parts by weight of photoinitiator 2,4,6-trimethylbenzoyl diphenylpostin oxide (Ciba special chemicals, Darocur TPO, photoinitiator 1-hydroxy-cyclohexyl-phenylketone (Ciba special chemicals, Irgarcure 184) and the additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate 2.0 parts by weight were mixed to prepare a composition for forming a structural layer.
그 후, 백코팅층이 형성되지 않은 기재층이 이면에 구조층 형성용 조성물을 도포하여 렌티큘러 패턴 형상롤러의 프레임 위에 놓고 Type-D bulb가 장착된 자외선 조사장치(Fusion사, 600W/inch2)에 기재층 방향으로 600mJ/㎠의 UV를 조사하여 렌티큘러 패턴이 선형배열로 형성시켜 복합광학시트를 제조하였다. 이때, 몰드의 형상은 표 1에 나타난 바와 같은 산 부분이 곡선인 삼각형의 종단면을 가지는 렌티큘러 패턴으로 종단면의 피치가 20um이고, 높이가 7.5um인 복합 광학시트를 제조하였다.Subsequently, the base layer on which the back coating layer was not formed was coated on the back side of the structure layer forming composition, placed on the frame of the lenticular pattern roller, and described on an ultraviolet irradiation device (Fusion, 600W / inch2) equipped with a Type-D bulb. By irradiating 600mJ / cm 2 of UV in the layer direction, a lenticular pattern was formed in a linear array to prepare a composite optical sheet. At this time, the shape of the mold is a lenticular pattern having a triangular longitudinal cross-section of the peak as shown in Table 1, the pitch of the longitudinal cross-section was 20um, a composite optical sheet having a height of 7.5um was prepared.
2매의 확산시트(XC210, 코오롱인더스트리)를 적층한 후, 상기 복합광학시트를 상기 2매의 확산시트 상에 적층하여 광학부재를 제조하였다.After stacking two diffusion sheets (XC210, Kolon Industries), the composite optical sheet was laminated on the two diffusion sheets to prepare an optical member.
실시예 2Example 2
구조층에 형성된 렌티큘러 패턴의 종단면 피치가 10㎛이고, 높이가 3.8㎛인 것을 제외하고 실시예 1과 동일한 방법으로 광학부재를 제조하였다.An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 10 μm and the height was 3.8 μm.
실시예3Example 3
*구조층에 형성된 렌티큘러 패턴의 종단면 피치가 30um이고, 높이가 11.7um인 것을 제외하고 실시예 1과 동일한 방법으로 광학부재를 제조하였다.* An optical member was manufactured in the same manner as in Example 1 except that the longitudinal section pitch of the lenticular pattern formed on the structural layer was 30 μm and the height was 11.7 μm.
비교예 1Comparative Example 1
복합광학시트 대신 확산시트(XC210, 코오롱인더스트리)를 사용한 것을 제외하고, 실시예 1과 동일한 방법으로 광학부재를 제조하였다. An optical member was manufactured in the same manner as in Example 1, except that a diffusion sheet (XC210, Kolon Industries) was used instead of the composite optical sheet.
비교예 2Comparative Example 2
복합광학시트 대신 복합프리즘시트(LF343, 코오롱인더스트리)를 사용한 것을 제외하고 실시예 1과 동일한 방법으로 광학부재를 제조하였다. An optical member was manufactured in the same manner as in Example 1, except that a composite prism sheet (LF343, Kolon Industries) was used instead of the composite optical sheet.
비교예 3Comparative Example 3
구조층에 형성된 렌티큘러 패턴의 종단면 피치가 20㎛이며, 높이가 9.5㎛인 것을 제외하고. 실시예 1과 동일한 방법으로 광학부재를 제조하였다.The longitudinal section pitch of the lenticular pattern formed in the structural layer is 20 µm, except that the height is 9.5 µm. An optical member was manufactured in the same manner as in Example 1.
비교예4 Comparative Example 4
구조층에 형성된 렌티큘러 패턴의 종단면 피치가 20㎛이고, 높이가 3.4㎛인 것을 제외하고,실시예 1과 동일한 방법으로 광학부재를 제조하였다.An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 20 μm and the height was 3.4 μm.
실시예 및 비교예에서 제조된 복합광학시트에 대해서 아래 방법과 같이, 휘도, 색좌표 및 반치각을 측정하여, 그 결과를 표 2에 나타내었다.About the composite optical sheets prepared in Examples and Comparative Examples, the brightness, color coordinates and half-angle angle were measured as in the following method, and the results are shown in Table 2.
(1) 휘도비 및 색좌표 평가(1) Evaluation of luminance ratio and color coordinate
실시예 및 비교예에서 제조된 광학부재를, 21.5인치 액정디스플레이 패널용 백라이트 유닛(BLU)에 장착하여 고정하고, 휘도계(모델명 : BM-7A, 일본 TOPCON사)를 사용하여 임의의 13지점의 휘도 및 색좌표를 측정하였고, 휘도비는 측정된 휘도 비교예 1의 휘도와의 비율을 기록하였고, 색좌표는 13지점의 평균을 기록하였다.The optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for a liquid crystal display panel, and fixed at 13 points by using a luminance meter (model name: BM-7A, Japan TOPCON). Luminance and color coordinates were measured, and the luminance ratio was recorded as a ratio with the luminance of the measured luminance comparative example 1, and the color coordinates recorded an average of 13 points.
(2) 반치각(2) half-angle
실시예 및 비교예에서 제조된 광학부재를, 21.5인치 액정디스플레이 패널용 백라이트 유닛(BLU)에 장착하여 고정하고, 휘도계(모델명 : BM-7A, 일본 TOPCON사)를 사용하여 BLU에서 정면으로 바라보는 BLU와 수직이 되는 지점의 휘도를 100%로 하였을 때 (각도 0도), 그 휘도가 50%가 되는 지점의 각도를 측정하여 표시하였다.The optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for the liquid crystal display panel, and faced at the front of the BLU using a luminance meter (model name: BM-7A, Japan TOPCON). When the luminance at the point perpendicular to the visible BLU was 100% (an angle of 0 degrees), the angle at the point at which the luminance became 50% was measured and displayed.
(3) Side Lobe 유무(3) Side Lobe presence
실시예 및 비교예에서 제조된 광하부재를, 21.5인치 액정디스플레이 패널용 백라이트 유닛에 장착하여 고정하고, 휘도계(모델명 : BM-7A, 일본 TOPCON사)를 사용하여 상하 방향으로 -80도에서 80도의 범위를 5도씩 간격으로 휘도를 측정하여, 시야각 -50도 이하 또는 50도 이상의 범위에서 휘도의 상승이 발생할 경우 Side Lobe 발생한 것이다.  The light emitting members prepared in Examples and Comparative Examples were mounted and fixed on a backlight unit for a 21.5-inch liquid crystal display panel, and were mounted at -80 degrees to 80 degrees in the vertical direction using a luminance meter (model name: BM-7A, Japan TOPCON). The luminance is measured at intervals of 5 degrees in the range of degrees, and when the luminance rises in the range of the viewing angle of -50 degrees or less or 50 degrees or more, the side lobe is generated.
표 1
복합광학시트 구조층의 종단면(산 부분이 곡선인 삼각형)
피치(P, ㎛) 높이(H, ㎛) 높이/피치(H/P) 곡률(㎛)
실시예1 20 7.5 0.38 6
실시예2 10 3.8 0.38 3
실시예3 30 11.7 0.39 8
비교예1 확산프리즘 시트(XC210, 코오롱 인더스트리)
비교예2 복합프리즘 시트(LF343, 코오롱 인더스트리)
비교예3 20 9 0.46 2
비교예4 20 3.4 0.17 16
Table 1
Longitudinal section of the composite optical sheet structure layer (triangular with a curved mountain)
Pitch (P, μm) Height (H, μm) Height / Pitch (H / P) Curvature (μm)
Example 1 20 7.5 0.38 6
Example 2 10 3.8 0.38 3
Example 3 30 11.7 0.39 8
Comparative Example 1 Diffusion Prism Sheet (XC210, Kolon Industries)
Comparative Example 2 Composite Prism Sheet (LF343, Kolon Industries)
Comparative Example 3 20 9 0.46 2
Comparative Example 4 20 3.4 0.17 16
표 2
휘도비(%) 색좌표 반치각Side Lobe유무
x y 좌우 상하
실시예1 106 0.298 0.282 -50/51.5 -38/38 무
실시예2 105 0.298 0.282 -50/52 -38/38 무
실시예3 106 0.298 0.283 -50/50 -38/38 무
비교예1 100 0.299 0.282 -42/44 -43/43 무
비교예2 115 0.300 0.284 -49/49 -35/35 유
비교예3 108 0.309 0.283 -49/50 -36/36 유
비교예4 88 0.299 0.282 -48/48 -40/40 무
TABLE 2
Luminance Ratio (%) Color coordinates Half Lobe Side Lobe
x y Right and left Up and down
Example 1 106 0.298 0.282 -50 / 51.5 -38/38 radish
Example 2 105 0.298 0.282 -50/52 -38/38 radish
Example 3 106 0.298 0.283 -50/50 -38/38 radish
Comparative Example 1 100 0.299 0.282 -42/44 -43/43 radish
Comparative Example 2 115 0.300 0.284 -49/49 -35/35 U
Comparative Example 3 108 0.309 0.283 -49/50 -36/36 U
Comparative Example 4 88 0.299 0.282 -48/48 -40/40 radish
상기 표 1, 표 2 및 도 5에서 보는 바와 같이 구조층의 종단면의 높이/피치의 비가 0.4 이하일 때 확산시트 대비하여 시야각이 개선됨을 확인 할 수 있으며 Side Lobe가 발생하지 않음을 알 수 있으나(실시예 1 내지 실시예 3, 도 6의 (a)), 비교예 3은 높이/피치의 비가 0.4이상으로 상하 시야각에서 Side Lobe가 발생됨을 확인할 수 있다. As shown in Table 1, Table 2 and Figure 5 it can be seen that the viewing angle is improved compared to the diffusion sheet when the ratio of the height / pitch of the longitudinal section of the structural layer is less than 0.4 and it can be seen that the side lobe does not occur (implementation) Example 1 to Example 3, Figure 6 (a)), Comparative Example 3 it can be seen that the side Lobe is generated at the vertical viewing angle with a height / pitch ratio of 0.4 or more.
또한, 비교예 2와 같이 확산시트 2매에 복합프리즘시트가 적층된 경우에도 Side Lobe가 발생함을 알 수 있다 (도 6의 (c)).In addition, it can be seen that the side lobe occurs even when the composite prism sheet is laminated on two diffusion sheets as in Comparative Example 2 (FIG. 6C).

Claims (8)

  1. 제1 확산시트; 상기 제1 확산시트 상에 적층된 제2 확산시트; 및 상기 제2 확산시트 상에 적층된 복합 광학시트를 포함하는 광학부재로서,A first diffusion sheet; A second diffusion sheet stacked on the first diffusion sheet; And a composite optical sheet laminated on the second diffusion sheet.
    상기 복합광학시트는 기재층; 상기 기재층의 상면에 형성되며, 그 종단면의 형상은 산 부분이 곡선인 이등변 삼각형인 렌티큘러 패턴이 배열된 구조층; 및 상기 기재층의 하면에 형성되며, 입자가 분산되어 있는 백코팅층을 포함하는 것임을 특징으로 하는 광학부재.The composite optical sheet is a substrate layer; A structure layer formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And a back coating layer formed on a lower surface of the base layer, in which particles are dispersed.
  2. 제1항에 있어서,The method of claim 1,
    상기 산 부분이 곡선인 삼각형 단면은 그 높이/피치(height/pitch, H/P)가 0.4이하인 것임을 특징으로 하는 광학부재.The triangular cross section in which the peak is curved has a height / pitch (H / P) of 0.4 or less.
  3. 제1항에 있어서,The method of claim 1,
    상기 산 부분이 곡선인 삼각형 단면은 그 피치가 5~20㎛인 것임을 특징으로 하는 광학부재.The triangular cross section of the curved portion of the peak portion is characterized in that the pitch is 5 ~ 20㎛.
  4. 제1항에 있어서,The method of claim 1,
    상기 산 부분이 곡선인 삼각형 단면은 곡선의 곡률(round)이 5㎛ ~14㎛ 인 것임을 특징으로 하는 광학부재.The triangular cross section of the curved portion of the mountain is characterized in that the curvature of the curve (round) is 5㎛ ~ 14㎛.
  5. 제1항에 있어서,The method of claim 1,
    상기 구조층은 그 굴절률(refractive index, R.I.)이 1.47~1.55인 것임을 특징으로 하는 광학부재.The structure layer is an optical member, characterized in that its refractive index (R.I.) is 1.47 ~ 1.55.
  6. 제1항에 있어서,The method of claim 1,
    상기 백코팅층은 바인더 수지 100중량부에 대하여 입자 2~10 중량부를 포함하는 것임을 특징으로 하는 광학부재.The back coating layer is an optical member, characterized in that it comprises 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin.
  7. 제6항에 있어서,The method of claim 6,
    상기 백코팅층은 바인더 수지 100중량부에 대하여 유기 입자, 무기 입자 및 이들의 혼합물 중 선택되는 입자 2 ~ 10중량부를 포함하는 것임을 특징으로 하는 광학부재.The back coating layer is an optical member, characterized in that it comprises 2 to 10 parts by weight of particles selected from organic particles, inorganic particles and mixtures thereof with respect to 100 parts by weight of the binder resin.
  8. 제1항 내지 제7항 중 어느 한 항의 광학부재를 포함하는 백라이트 유닛.A backlight unit comprising the optical member of any one of claims 1 to 7.
PCT/KR2014/005683 2013-06-28 2014-06-26 Optical member and backlight unit comprising same WO2014209032A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090022171A (en) * 2007-08-29 2009-03-04 주식회사 나노옵틱스 Brightness-enhanced optical sheet which has a diffusion fuction
KR20110005458A (en) * 2009-07-10 2011-01-18 주식회사 상보 Optical sheet having multiple curvature
JP2011081166A (en) * 2009-10-07 2011-04-21 Toppan Printing Co Ltd El panel, lighting system using the same, and display device using the same
JP2011247947A (en) * 2010-05-24 2011-12-08 Dainippon Printing Co Ltd Optical sheet, surface light source device, and display device
KR20130035537A (en) * 2011-09-30 2013-04-09 엘지디스플레이 주식회사 Liquid crystal display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090022171A (en) * 2007-08-29 2009-03-04 주식회사 나노옵틱스 Brightness-enhanced optical sheet which has a diffusion fuction
KR20110005458A (en) * 2009-07-10 2011-01-18 주식회사 상보 Optical sheet having multiple curvature
JP2011081166A (en) * 2009-10-07 2011-04-21 Toppan Printing Co Ltd El panel, lighting system using the same, and display device using the same
JP2011247947A (en) * 2010-05-24 2011-12-08 Dainippon Printing Co Ltd Optical sheet, surface light source device, and display device
KR20130035537A (en) * 2011-09-30 2013-04-09 엘지디스플레이 주식회사 Liquid crystal display device

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