WO2014017778A1 - Optical sheet and display device comprising same - Google Patents

Optical sheet and display device comprising same Download PDF

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Publication number
WO2014017778A1
WO2014017778A1 PCT/KR2013/006417 KR2013006417W WO2014017778A1 WO 2014017778 A1 WO2014017778 A1 WO 2014017778A1 KR 2013006417 W KR2013006417 W KR 2013006417W WO 2014017778 A1 WO2014017778 A1 WO 2014017778A1
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WO
WIPO (PCT)
Prior art keywords
layer
light collecting
optical sheet
optical
pattern
Prior art date
Application number
PCT/KR2013/006417
Other languages
French (fr)
Korean (ko)
Inventor
이수경
박경곤
최미정
Original Assignee
제일모직 주식회사
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Publication of WO2014017778A1 publication Critical patent/WO2014017778A1/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
    • G02B5/0236—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
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • 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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to an optical sheet and a display device including the same.
  • Liquid crystal displays are display devices widely applied to TVs, monitors, notebooks, mobile phones, and the like.
  • the liquid crystal display device includes a backlight unit that provides a light source from the outside because it cannot emit light by itself.
  • the liquid crystal display device requires a multi-layered optical sheet including a diffusion sheet, a prism sheet, a protective sheet, and the like to effectively transmit the light emitted from the backlight unit.
  • an optical sheet capable of realizing more than equivalent properties in terms of brightness and shielding while reducing the number of optical sheets in accordance with the trend of slimming devices and low power consumption.
  • Another object of the present invention is to provide an optical sheet capable of simultaneously implementing a light condensing function and a diffusing function.
  • Still another object of the present invention is to provide a display device including the optical sheet.
  • An optical sheet includes a base layer, a first light collecting layer formed on one surface of the base layer, a diffusion layer formed on the other surface of the base layer, and a second light collecting layer formed on the diffusion layer, Each of the first light collecting layer and the second light collecting layer may have a higher refractive index than the diffusion layer, and a first optical pattern may be formed on an interface between the diffusion layer and the second light collecting layer.
  • the refractive indexes of the first light collecting layer and the second light collecting layer may be about 1.5 or more, respectively, and the refractive index of the diffusion layer may be less than about 1.5.
  • the first optical pattern may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  • a second optical pattern may be further formed on the lower surface of the second light collecting layer.
  • the second optical pattern may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  • a fourth optical pattern including at least one of a prism, a lenticular, a microlens, and an embossed pattern may be formed on the first light collecting layer.
  • At least one of the diffusion layer and the second light collecting layer may further include organic or inorganic particles.
  • the organic or inorganic particles may include at least one of silicon-based, nylon-based, (meth) acrylic, polystyrene (PS), silica, and PMMA (polymethyl methacrylate).
  • a display device may include the optical sheet.
  • the present invention provides a composite optical sheet having high shielding power without deteriorating luminance.
  • the present invention provides an optical sheet capable of simultaneously implementing a light condensing function and a diffusing function.
  • the present invention provides an optical sheet capable of providing an equivalent level of brightness and securing a viewing angle while reducing the number of sheets having a multilayer structure such as a diffusion sheet, a prism sheet, a protective sheet, and the like by combining functions.
  • the present invention can reduce the number of sheets of a multi-layer structure to provide a slim display device.
  • FIG. 1 is a cross-sectional view of an optical sheet of an embodiment of the present invention.
  • Figure 2 is a schematic diagram for explaining the effect of the optical sheet according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of an optical sheet of another embodiment of the present invention.
  • upper surface and “lower surface” are defined based on the drawings, and according to a viewing angle, “upper surface” may be changed to “lower surface” and “lower surface” to “upper surface”.
  • (Meth) acryl may mean acrylic or methacryl.
  • an optical sheet 100 according to an embodiment of the present invention may include a base layer 1, a first light collecting layer 2, a diffusion layer 3, and a second light collecting layer 4. have.
  • the diffusion layer 3 is formed on the lower surface of the base layer 1, and light scatters from the lower surface to perform a diffusion function.
  • the refractive index of the diffusion layer 3 may be lower than the refractive index of each of the first light collecting layer 2 and the second light collecting layer 4, and the refractive index of the diffusion layer 3 is less than about 1.5, for example, about 1.0 to 1.49 days. Can be. As the refractive index of the diffusion layer 3 approaches about 1.0, the brightness enhancement effect of the optical sheet can be expected.
  • the diffusion layer 3 may be formed of a (meth) acrylate curable resin, for example, a urethane (meth) acrylate curable resin, but is not limited thereto.
  • the second condensing layer 4 may be formed on the lower surface of the diffusion layer 3 and may perform a condensing function as the outermost layer of the optical sheet when the optical sheet is stacked on the upper surface of the backlight unit.
  • the first optical pattern may be formed on the boundary surface 10 of the second light collecting layer 4 and the diffusion layer 3, and the second optical pattern may be formed on the lower surface 20 of the second light collecting layer 4. Due to the formation of the first optical pattern and the second optical pattern, light may be diffused by the second optical pattern on the lower surface of the second condensing layer 4, and the second condensing layer 4 and the diffusion layer 3 may Light is collected at the interface, so that the second light collecting layer 4 may simultaneously diffuse and collect.
  • the first optical pattern and the second optical pattern may be the same in shape or different from each other.
  • the first optical pattern may include, for example, at least one of a prism, lenticular, microlens, and embossing pattern
  • the second optical pattern includes, for example, at least one of a prism, lenticular, microlens, and embossing pattern can do.
  • a separation plane may be formed between the optical patterns, and the height, width, diameter, etc. may be the same or different between neighboring optical patterns.
  • the prism may have a cross-sectional shape of one of a polygon, a semicircle, and an ellipse, such as a triangle and a trapezoid.
  • the height of the prism may be about 1 to 100 ⁇ m and the width may be about 1 to 200 ⁇ m.
  • the diameters of the lenticular, microlens, and emboss patterns may be about 1 to 200 ⁇ m, respectively, and the height may be about 1 to 120 ⁇ m, respectively.
  • the emboss pattern has an average surface roughness (Ra) of about 0.1 to 10 ⁇ m and a maximum surface roughness.
  • the value Rmax may be about 0.2 to 20 ⁇ m.
  • the height and width of the first optical pattern and the second optical pattern are not limited, but may be about 1 to 100 ⁇ m in height and about 1 to 200 ⁇ m in width in consideration of light collection efficiency.
  • the second light collecting layer 4 has a higher refractive index than the diffusion layer 3.
  • the second light collecting layer 4 may have a higher refractive index than the diffusion layer 3 and may have a brightness increasing effect.
  • the ratio of the refractive index of the second light collecting layer 4 to the refractive index of the diffusion layer 3 may be greater than about 1, for example greater than about 1.01, for example about 1.05 to 1.5.
  • the refractive index of the second light collecting layer 4 may be about 1.5 or more, for example, about 1.5 to 1.7. In the above range can be expected to improve the brightness of the optical sheet.
  • FIG. 2 is a schematic diagram for explaining the effect of the optical sheet according to an embodiment of the present invention.
  • the incident light is Although it is relatively diffused in the diffusion layer 3, it is emitted to the front by the first light collecting layer 2 can be improved brightness.
  • the second light collecting layer 4 serves to collect light relatively to the diffusion layer 3.
  • the diffusion effect may be further increased when organic or inorganic particles are dispersed in the diffusion layer (3).
  • the diffusion layer 3 having the low refractive index under the base layer 1, the light collection efficiency of the first light collecting layer 2 can be further increased.
  • the thickness or height (including the second optical pattern) of the second light collecting layer 4 may be about 1 to 150 ⁇ m. In the above range can be expected to improve the brightness of the optical sheet.
  • the interface between the diffusion layer 3 and the base layer 1 may not have a pattern or a third optical pattern.
  • the third optical pattern may be the same as or different from the first optical pattern or the second optical pattern, and may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  • the diffusion layer 3 and the second light collecting layer 4 may be formed of the same or different resins.
  • the diffusion layer 3 and the second light collecting layer 4 may be formed of polyester resins such as UV curable urethane (meth) acrylic resins, polycarbonate resins, polyethylene naphthalate resins, and the like, but are not limited thereto. Do not.
  • the thickness or height (including the first optical pattern) of the diffusion layer 3 may be about 1 to 150 ⁇ m.
  • the base layer 1 serves to physically and structurally support the optical sheet. However, the base material layer 1 may be omitted if sufficient strength is ensured only by the diffusion layer 3 and the first light collecting layer 2 without the base material layer 1.
  • the base layer 1 may be made of a material known to those skilled in the art.
  • the base layer 1 may be made of a transparent material. Specifically, it may be a polyester including polycarbonate, polysulfone, poly (meth) acrylate, polystyrene, polyvinylchloride, polyvinyl alcohol, polynorbornene, polyethylene terephthalate and the like.
  • the base material layer 1 is not limited to the said illustration.
  • the thickness of the base layer 1 may be about 25 to 300 ⁇ m. In the above range, it is possible to ensure the reliability and stability when laminating the first light collecting layer, the diffusion layer may be good.
  • the first light collecting layer 2 may refer to a fourth optical pattern formed on the base layer 1.
  • the first light collecting layer 2 may perform a light collecting function on the light passing through the second light collecting layer 4, the diffusion layer 3, and the base layer 1.
  • the refractive index of the first light collecting layer 2 may be about 1.5 or more, for example, about 1.5 to 1.7. In this range, the light collecting efficiency may be good.
  • the fourth optical pattern for forming the first light collecting layer 2 may be the same as or different from the optical pattern formed in the diffusion layer 3 and / or the second light collecting layer 4.
  • the fourth optical pattern is not particularly limited as long as it protrudes from the base layer 1 to perform a light condensing function.
  • the fourth optical pattern may be a prism, a lenticular lens, a microlens, an emboss, or the like, and the prism may be one of a polygonal, semicircular, semi-elliptic, triangular, and trapezoidal cross-sectional shape.
  • a separation plane may be formed between the fourth optical patterns.
  • Prisms can be one of triangle, semicircle, or trapezoid in cross-sectional shape.
  • the height of the prism may be about 1 to 100 ⁇ m and the width may be about 1 to 200 ⁇ m.
  • the diameter of the lenticular, microlens, and emboss patterns may be about 1 to 200 ⁇ m, and the height may be about 1 to 120 ⁇ m, and the emboss pattern has an average surface roughness (Ra) of about 0.1 to 10 ⁇ m and a maximum value of surface roughness ( R max) may be about 0.2 to 20 ⁇ m.
  • the height and width of the optical pattern of the first light collecting layer 2 are not limited, but may be about 1 to 100 ⁇ m in height and about 1 to 200 ⁇ m in width in consideration of light collection efficiency.
  • the first light collecting layer 2 may be made of the same or different type of resin as the diffusion layer 3 or the second light collecting layer 4.
  • the first light collecting layer 2 may be composed of polyester resins such as (meth) acrylic resins, UV curable urethane (meth) acrylic resins, polycarbonate resins, polyethylene naphthalate resins, and mixtures thereof. have.
  • At least one of the second light collecting layer 4 and the diffusion layer 3 may further enhance the effect by further including organic or inorganic particles.
  • Organic or inorganic particles may be randomly included in the diffusion layer 3 or the second light collecting layer 4.
  • the optical sheet 200 includes a base layer 1, a first condensing layer 2 formed on an upper surface of the base layer 1, a diffusion layer 3 formed on a lower surface of the base layer 1, and The second light collecting layer 4 formed on the bottom surface of the diffusion layer 3 may be included, and the diffusion layer 3 may include organic or inorganic particles 5.
  • the organic or inorganic particles 5 scatter light due to the difference in refractive index by using a material having a refractive index different from that of the resin constituting the second light concentrating layer 4 or the diffusion layer 3, and thus the entire area of the diffusion layer 3. By dispersing over, the shielding force can be improved.
  • the refractive index of the organic or inorganic particles 5 may be about 1.46 to 1.55.
  • the organic or inorganic particles 5 may be silicon-based, nylon-based, (meth) acrylic-based, polystyrene (PS), silica, PMMA (polymethylmethacrylate), or the like as the diffusing particles.
  • the organic or inorganic particles 5 may have a spherical bead form although not limited thereto.
  • the size or diameter of the organic or inorganic particles 5 is not limited, but may be about 1 to 15 ⁇ m. In the above range, it is possible to implement the light diffusion characteristics.
  • the organic or inorganic particles (5) in the diffusion layer (3) it is possible to control the diffusion rate of light.
  • the organic or inorganic particles 5 may be included in about 1 to 30% by weight of the diffusion layer, for example about 1 to 10% by weight in order to minimize the decrease in brightness. In the above range, it is possible to implement the light diffusion characteristics.
  • the second light collecting layer may also include organic or inorganic particles in an amount of about 1 to 30% by weight, for example, about 1 to 10% by weight, of the second light collecting layer in order to implement light diffusing characteristics. In the above range, it is possible to implement the light diffusion characteristics.
  • the optical sheet of the present invention may be manufactured by a coating and pattern forming method for a base layer rather than a lamination method used in a conventional multilayer structure.
  • a pattern may be formed by using a stamping roll formed with a pattern using a mixture of a resin for forming a first condensing layer, a diffusion layer, or a second condensing layer and a photoinitiator, and irradiating ultraviolet rays.
  • the order of pattern formation of the first light collecting layer and the second light collecting layer is not particularly limited.
  • the optical sheet of the present invention is laminated on the optical sheet by simultaneously stacking the light collecting layer and the diffusing layer in a manner of coating on both sides of a single base layer rather than bonding the base layer having the diffusion layer and another base layer having the light collecting layer. While reducing the number of layers constituting, it is possible to realize a combination of the functions of condensing and diffusing.
  • the optical sheet of the present invention can be used as a composite sheet that simultaneously implements the functions of the prism sheet and the diffusion sheet.
  • a display device may include the optical sheet.
  • the display device is not limited, but may include a liquid crystal display device.
  • the liquid crystal display device may include a light guide plate, the optical sheet, and a liquid crystal display panel, and the optical sheet may be positioned on the light guide plate.
  • a polyethylene terephthalate film (thickness of 250 ⁇ m) is used as a base layer, and an acrylic curable resin having a refractive index of 1.55 is coated on the top surface of the base layer, and then put into a mold having a prism pattern.
  • the first light collecting layer of prisms having a shape was formed.
  • a UV curable urethane acrylate resin having a refractive index of 1.47 was coated and put into a mold having an embossed pattern.
  • the diffusion layer having the embossed pattern formed on the lower surface was exposed to ultraviolet rays in a roll to roll method. Formed.
  • An optical sheet was manufactured in the same manner as in Example 1, except that the optical patterns of the first light collecting layer, the diffusion layer, and the second light collecting layer were changed as shown in Table 1 below.
  • beads of acrylic material 5 wt% in the diffusion layer
  • Example 1 even if the diffusion layer and the second light collecting layer are not included (Comparative Example 1), the second light collecting layer is not included (Comparative Example 2), or the diffusion layer and the second light collecting layer are included, An optical sheet was manufactured by the same method as the flat type except that the first optical pattern was not formed on the interface (Comparative Example 3).
  • Brightness An optical sheet is assembled to a backlight unit including a light source of a direct type or edge type LED and the luminance is measured. Luminance is measured using a BM-7 spectroradiometer (TOPCON). Luminance is expressed as a percentage (%) of the luminance value of Comparative Example 1.
  • Shielding property shows whether or not the pattern of the upper surface of the light guide plate can be seen when the optical sheet is laminated on the light guide plate of the backlight unit. After the 32-inch LCD module using the edge LED light source is turned on, the optical sheet is placed on the light guide plate and visually evaluates whether the pattern on the top of the light guide plate is visible. Evaluation criteria were 0 to 10, and "0" means that the light guide plate pattern is recognized as it is because there is no shielding at all, and "10" means that the pattern of the light guide plate is not seen at all. It means good.
  • Example 1 First light collecting layer Diffusion layer Second light collecting layer Luminance Shielding Pattern Type Pattern Type Bead Included Pattern Type Bead Included % 0-10
  • Example 2 prism Emboss include Emboss Without 85 8
  • Example 3 Lenticular Emboss Without Emboss Without 80 8
  • Example 4 Microlens Emboss Without Emboss Without 65 10
  • Example 5 Emboss Emboss Without Emboss Without 50 10
  • Example 7 prism prism include Emboss Without 90 10
  • Example 8 Emboss prism Without Emboss Without 70 10 Comparative Example 1 prism - - - - 100 2 Comparative Example 2 prism Emboss Without - - 95 5 Comparative Example 3 prism Flat Without Flat Without 100 2
  • the optical sheet of the present invention had high shielding property while ensuring appropriate luminance.
  • Comparative Example 1-2 which does not include the diffusion layer and the second light collecting layer or does not include the second light collecting layer

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

Abstract

The present invention relates to an optical sheet and a display device comprising the same, and the optical sheet comprises: a base material layer; a first light-condensing layer formed on one surface of the base material layer; a diffusion layer formed on the other surface of the base material layer; and a second light-condensing layer formed on the diffusion layer, wherein the first and second light-condensing layers have a higher refractive index that that of the diffusion layer, and a first optical pattern is formed on a boundary surface between the diffusion layer and the second light-condensing layer.

Description

광학시트 및 이를 포함하는 디스플레이 장치Optical sheet and display device including same
본 발명은 광학시트 및 이를 포함하는 디스플레이 장치에 관한 것이다.The present invention relates to an optical sheet and a display device including the same.
액정표시장치는 TV, 모니터, 노트북, 휴대폰 등에 광범위하게 적용되고 있는 디스플레이 장치이다. 액정표시장치는 자체 발광할 수 없기 때문에 외부에서 광원을 제공하는 백라이트유닛을 포함한다. 또한, 액정표시장치는 백라이트유닛에서 나오는 광을 효과적으로 전달하기 위하여 확산시트, 프리즘시트, 보호시트 등을 포함하는 다층의 광학시트가 요구되었다. 그러나, 최근에는 장치의 슬림화 및 저 소비전력의 추세에 따라 광학시트의 수를 감소시키면서, 휘도 및 차폐성 등에서 동등 이상의 물성을 구현할 수 있는 광학시트가 요구되고 있다.Liquid crystal displays are display devices widely applied to TVs, monitors, notebooks, mobile phones, and the like. The liquid crystal display device includes a backlight unit that provides a light source from the outside because it cannot emit light by itself. In addition, the liquid crystal display device requires a multi-layered optical sheet including a diffusion sheet, a prism sheet, a protective sheet, and the like to effectively transmit the light emitted from the backlight unit. However, in recent years, there has been a demand for an optical sheet capable of realizing more than equivalent properties in terms of brightness and shielding while reducing the number of optical sheets in accordance with the trend of slimming devices and low power consumption.
본 발명의 목적은 휘도가 저하되지 않으면서 차폐력이 높은 광학시트를 제공하는 것이다.It is an object of the present invention to provide an optical sheet having high shielding power without deteriorating luminance.
본 발명의 다른 목적은 집광 기능과 확산 기능을 동시에 구현할 수 있는 광학시트를 제공하는 것이다.Another object of the present invention is to provide an optical sheet capable of simultaneously implementing a light condensing function and a diffusing function.
본 발명의 또 다른 목적은 상기 광학시트를 포함하는 디스플레이장치를 제공하는 것이다.Still another object of the present invention is to provide a display device including the optical sheet.
본 발명의 일 관점인 광학시트는 기재층, 상기 기재층의 일면 상에 형성된 제1 집광층, 상기 기재층의 타면 상에 형성된 확산층, 및 상기 확산층 상에 형성된 제2집광층을 포함하고, 상기 제1 집광층과 상기 제2집광층은 각각 상기 확산층 대비 고굴절률을 가지고, 상기 확산층과 상기 제2집광층의 경계면에는 제1 광학패턴이 형성될 수 있다.An optical sheet according to an aspect of the present invention includes a base layer, a first light collecting layer formed on one surface of the base layer, a diffusion layer formed on the other surface of the base layer, and a second light collecting layer formed on the diffusion layer, Each of the first light collecting layer and the second light collecting layer may have a higher refractive index than the diffusion layer, and a first optical pattern may be formed on an interface between the diffusion layer and the second light collecting layer.
상기 제1 집광층 및 상기 제2집광층의 굴절률은 각각 약 1.5 이상이고, 상기 확산층의 굴절률은 약 1.5 미만이 될 수 있다.The refractive indexes of the first light collecting layer and the second light collecting layer may be about 1.5 or more, respectively, and the refractive index of the diffusion layer may be less than about 1.5.
상기 제1 광학패턴은 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함할 수 있다.The first optical pattern may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
상기 제2집광층의 하부면에 제2 광학패턴이 더 형성될 수 있다.A second optical pattern may be further formed on the lower surface of the second light collecting layer.
상기 제2 광학패턴은 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함할 수 있다.The second optical pattern may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
상기 제1집광층에는 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함하는 제4광학패턴이 형성될 수 있다.A fourth optical pattern including at least one of a prism, a lenticular, a microlens, and an embossed pattern may be formed on the first light collecting layer.
상기 확산층과 상기 제2집광층 중 하나 이상은 유기 또는 무기 입자를 더 포함할 수 있다.At least one of the diffusion layer and the second light collecting layer may further include organic or inorganic particles.
상기 유기 또는 무기 입자는 실리콘계, 나일론계, (메트)아크릴계, 폴리스티렌(PS), 실리카, PMMA(폴리메틸메타아크릴레이트) 중 1종 이상을 포함할 수 있다.The organic or inorganic particles may include at least one of silicon-based, nylon-based, (meth) acrylic, polystyrene (PS), silica, and PMMA (polymethyl methacrylate).
본 발명의 다른 관점인 디스플레이장치는 상기 광학시트를 포함할 수 있다.A display device according to another aspect of the present invention may include the optical sheet.
본 발명은 휘도가 저하되지 않으면서 차폐력이 높은 복합 광학시트를 제공하였다. 본 발명은 집광 기능과 확산 기능을 동시에 구현할 수 있는 광학 시트를 제공하였다. 본 발명은 기능의 복합화를 통해 디스플레이 장치의 확산시트, 프리즘 시트, 보호시트 등의 다층 구조의 시트 매수를 줄이면서도 동등 수준의 휘도를 제공하고 시야각을 확보할 수 있는 광학시트를 제공하였다. 본 발명은 다층 구조의 시트 매수를 줄일 수 있어 슬림화된 디스플레이장치를 제공하였다.The present invention provides a composite optical sheet having high shielding power without deteriorating luminance. The present invention provides an optical sheet capable of simultaneously implementing a light condensing function and a diffusing function. The present invention provides an optical sheet capable of providing an equivalent level of brightness and securing a viewing angle while reducing the number of sheets having a multilayer structure such as a diffusion sheet, a prism sheet, a protective sheet, and the like by combining functions. The present invention can reduce the number of sheets of a multi-layer structure to provide a slim display device.
도 1은 본 발명 일 구체예의 광학시트의 단면도이다.1 is a cross-sectional view of an optical sheet of an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 광학시트의 효과를 설명하기 위한 모식도이다.Figure 2 is a schematic diagram for explaining the effect of the optical sheet according to an embodiment of the present invention.
도 3은 본 발명 다른 구체예의 광학시트의 단면도이다.3 is a cross-sectional view of an optical sheet of another embodiment of the present invention.
첨부한 도면을 참고하여 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성 요소에 대해서는 동일한 도면 부호를 붙였다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.
본 명세서에서 "상부면"과 "하부면"은 도면을 기준으로 정의한 것으로서, 보는 시각에 따라 "상부면"이 "하부면"으로 "하부면"이 "상부면"으로 변경될 수 있고, "(메트)아크릴"은 아크릴 또는 메타아크릴을 의미할 수 있다.In the present specification, "upper surface" and "lower surface" are defined based on the drawings, and according to a viewing angle, "upper surface" may be changed to "lower surface" and "lower surface" to "upper surface". (Meth) acryl "may mean acrylic or methacryl.
이하, 도 1을 참조하여 본 발명의 일 구체예에 따른 광학시트를 설명한다. 도 1은 본 발명 일 구체예의 광학시트의 단면도이다. 도 1을 참조하면, 본 발명의 일 구체예에 따른 광학시트(100)는 기재층(1), 제1집광층(2), 확산층(3) 및 제2집광층(4)을 포함할 수 있다.Hereinafter, an optical sheet according to an embodiment of the present invention will be described with reference to FIG. 1. 1 is a cross-sectional view of an optical sheet of an embodiment of the present invention. Referring to FIG. 1, an optical sheet 100 according to an embodiment of the present invention may include a base layer 1, a first light collecting layer 2, a diffusion layer 3, and a second light collecting layer 4. have.
확산층(3)은 기재층(1) 하부면에 형성되고, 하부면에서 광의 산란이 일어나 확산 기능을 수행한다. 확산층(3)의 굴절률은 제1 집광층(2) 및 제2집광층(4)의 각각의 굴절률보다는 낮을 수 있으며, 확산층(3)의 굴절률은 약 1.5 미만, 예를 들면 약 1.0 내지 1.49일 수 있다. 확산층(3)의 굴절률이 약 1.0에 근접할수록 광학시트의 휘도 향상 효과를 기대할 수 있다. 확산층(3)은 (메트)아크릴레이트계 경화형 수지, 예를 들어, 우레탄 (메트)아크릴레이트계 경화형 수지로 형성될 수 있으나, 이에 제한되는 것은 아니다.The diffusion layer 3 is formed on the lower surface of the base layer 1, and light scatters from the lower surface to perform a diffusion function. The refractive index of the diffusion layer 3 may be lower than the refractive index of each of the first light collecting layer 2 and the second light collecting layer 4, and the refractive index of the diffusion layer 3 is less than about 1.5, for example, about 1.0 to 1.49 days. Can be. As the refractive index of the diffusion layer 3 approaches about 1.0, the brightness enhancement effect of the optical sheet can be expected. The diffusion layer 3 may be formed of a (meth) acrylate curable resin, for example, a urethane (meth) acrylate curable resin, but is not limited thereto.
제2집광층(4)은 확산층(3) 하부면에 형성되고, 백라이트 유닛 상부면에 광학시트 적층시 광학시트의 최 외곽층으로 집광 기능을 수행할 수 있다.The second condensing layer 4 may be formed on the lower surface of the diffusion layer 3 and may perform a condensing function as the outermost layer of the optical sheet when the optical sheet is stacked on the upper surface of the backlight unit.
제2집광층(4)과 확산층(3)의 경계면(10)에는 제1광학패턴이 형성되고, 제2집광층(4)의 하부면(20)에는 제2광학패턴이 형성될 수 있다. 제1광학패턴과 제2광학패턴의 형성으로 인하여, 제2집광층(4)은 하부면에서는 제2광학패턴에 의해 광이 확산될 수 있고 제2집광층(4)과 확산층(3)의 경계면에서는 광이 집광되어, 제2 집광층(4)은 확산과 집광이 동시에 일어날 수 있다.The first optical pattern may be formed on the boundary surface 10 of the second light collecting layer 4 and the diffusion layer 3, and the second optical pattern may be formed on the lower surface 20 of the second light collecting layer 4. Due to the formation of the first optical pattern and the second optical pattern, light may be diffused by the second optical pattern on the lower surface of the second condensing layer 4, and the second condensing layer 4 and the diffusion layer 3 may Light is collected at the interface, so that the second light collecting layer 4 may simultaneously diffuse and collect.
제1광학패턴과 제2광학패턴은 각각 패턴 형상이 동일할 수도 있고 서로 다를 수도 있다. 제1광학패턴은 예를 들면, 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 적어도 하나를 포함할 수 있고, 제2광학패턴은 예를 들면, 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 적어도 하나를 포함할 수 있다.The first optical pattern and the second optical pattern may be the same in shape or different from each other. The first optical pattern may include, for example, at least one of a prism, lenticular, microlens, and embossing pattern, and the second optical pattern includes, for example, at least one of a prism, lenticular, microlens, and embossing pattern can do.
제1광학패턴과 제2광학패턴 중 하나 이상에 있어서, 광학패턴 사이에는 이격 평면이 형성될 수도 있고, 이웃하는 광학패턴 간에 높이, 폭, 직경 등은 동일하거나 다를 수 있다. 프리즘은 단면 형상이 삼각형, 사다리꼴 등의 다각형, 반원형, 반타원형 중 하나가 될 수 있다. 프리즘의 높이는 약 1 내지 100㎛, 폭은 약 1 내지 200㎛가 될 수 있다. 렌티큘러, 마이크로렌즈, 엠보 패턴의 직경은 각각 약 1 내지 200㎛, 높이는 각각 약 1 내지 120㎛가 될 수 있고, 엠보 패턴은 평균 표면조도(Ra)가 약 0.1 내지 10㎛이고, 표면조도의 최대값(Rmax)이 약 0.2 내지 20㎛가 될 수 있다. 제1광학패턴, 제2광학패턴의 높이와 폭은 제한되지 않지만, 집광 효율을 고려하여 높이가 약 1 내지 100㎛, 폭이 약 1 내지 200㎛가 될 수 있다.In at least one of the first optical pattern and the second optical pattern, a separation plane may be formed between the optical patterns, and the height, width, diameter, etc. may be the same or different between neighboring optical patterns. The prism may have a cross-sectional shape of one of a polygon, a semicircle, and an ellipse, such as a triangle and a trapezoid. The height of the prism may be about 1 to 100 μm and the width may be about 1 to 200 μm. The diameters of the lenticular, microlens, and emboss patterns may be about 1 to 200 μm, respectively, and the height may be about 1 to 120 μm, respectively. The emboss pattern has an average surface roughness (Ra) of about 0.1 to 10 μm and a maximum surface roughness. The value Rmax may be about 0.2 to 20 μm. The height and width of the first optical pattern and the second optical pattern are not limited, but may be about 1 to 100 μm in height and about 1 to 200 μm in width in consideration of light collection efficiency.
제2집광층(4)은 확산층(3) 대비 고굴절률을 갖는다. 제2집광층(4)은 확산층(3) 대비 고굴절률을 가짐으로써 휘도 상승 효과를 가질 수 있다. 확산층(3) 의 굴절률에 대한 제2집광층(4)의 굴절률의 비는 약 1 초과, 예를 들면 약 1.01 초과, 예를 들면 약 1.05 내지 1.5가 될 수 있다. 제2집광층(4)의 굴절률은 약 1.5 이상, 예를 들면 약 1.5 내지 1.7이 될 수 있다. 상기 범위에서 광학시트의 휘도 향상 효과를 기대할 수 있다.The second light collecting layer 4 has a higher refractive index than the diffusion layer 3. The second light collecting layer 4 may have a higher refractive index than the diffusion layer 3 and may have a brightness increasing effect. The ratio of the refractive index of the second light collecting layer 4 to the refractive index of the diffusion layer 3 may be greater than about 1, for example greater than about 1.01, for example about 1.05 to 1.5. The refractive index of the second light collecting layer 4 may be about 1.5 or more, for example, about 1.5 to 1.7. In the above range can be expected to improve the brightness of the optical sheet.
이하, 도 2를 참조하여 본 발명의 일 실시예에 따른 광학시트의 효과에 대해 보다 구체적으로 설명한다. 도 2는 본 발명의 일 실시예에 따른 광학시트의 효과를 설명하기 위한 모식도이다. 도 2에 나타난 바와 같이, 기재층(1)의 하면에 저굴절률의 확산층(3)이 위치하고 확산층(3)의 하부에 고굴절률의 제2 집광층(4)이 위치하는 경우, 입사된 빛은 상대적으로 확산층(3)에서 확산되나 제1 집광층(2)에 의해 정면으로 출사되어 휘도가 향상될 수 있다. 이 때, 제2 집광층(4)에서는 확산층(3)에 비해 상대적으로 빛을 집광하는 역할을 하게 된다. 또한, 도면에는 도시되어 있지 않으나, 확산층(3)내에 유기 또는 무기입자가 분산되어 있는 경우에는 확산 효과가 더욱 증대될 수 있다. 이와 같이, 기재층(1)의 하부에 저굴절률을 갖는 확산층(3)이 위치함으로써 제1 집광층(2)에서의 집광효율이 더욱 증대되게 할 수 있다. Hereinafter, the effect of the optical sheet according to an embodiment of the present invention will be described in more detail with reference to FIG. 2. Figure 2 is a schematic diagram for explaining the effect of the optical sheet according to an embodiment of the present invention. As shown in FIG. 2, when the low refractive index diffusion layer 3 is positioned on the lower surface of the base layer 1 and the second light concentrating layer 4 having a high refractive index is positioned below the diffusion layer 3, the incident light is Although it is relatively diffused in the diffusion layer 3, it is emitted to the front by the first light collecting layer 2 can be improved brightness. At this time, the second light collecting layer 4 serves to collect light relatively to the diffusion layer 3. In addition, although not shown in the drawing, the diffusion effect may be further increased when organic or inorganic particles are dispersed in the diffusion layer (3). As such, by placing the diffusion layer 3 having the low refractive index under the base layer 1, the light collection efficiency of the first light collecting layer 2 can be further increased.
제2집광층(4)의 두께 또는 높이(제2광학패턴 포함)는 약 1 내지 150㎛가 될 수 있다. 상기 범위에서 광학시트의 휘도 향상 효과를 기대할 수 있다.The thickness or height (including the second optical pattern) of the second light collecting layer 4 may be about 1 to 150 μm. In the above range can be expected to improve the brightness of the optical sheet.
확산층(3)과 기재층(1)의 경계면은 패턴이 형성되지 않거나 제3광학패턴이 형성될 수도 있다. 제3광학패턴은 상술한 제1광학패턴 또는 제2광학패턴과 동일하거나 다를 수 있고, 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 적어도 하나를 포함할 수 있다.The interface between the diffusion layer 3 and the base layer 1 may not have a pattern or a third optical pattern. The third optical pattern may be the same as or different from the first optical pattern or the second optical pattern, and may include at least one of a prism, a lenticular, a microlens, and an embossed pattern.
확산층(3)과 제2집광층(4)은 동일 또는 이종의 수지로 형성될 수 있다. 예를 들면, 확산층(3)과 제2집광층(4)은 UV 경화형 우레탄 (메트)아크릴계 수지, 폴리카보네이트계 수지, 폴리에틸렌 나프탈레이트 수지 등의 폴리에스테르계 수지 등으로 구현될 수 있지만 이에 제한되지 않는다. 확산층(3)의 두께 또는 높이(제1광학패턴 포함)는 약 1 내지 150㎛가 될 수 있다.The diffusion layer 3 and the second light collecting layer 4 may be formed of the same or different resins. For example, the diffusion layer 3 and the second light collecting layer 4 may be formed of polyester resins such as UV curable urethane (meth) acrylic resins, polycarbonate resins, polyethylene naphthalate resins, and the like, but are not limited thereto. Do not. The thickness or height (including the first optical pattern) of the diffusion layer 3 may be about 1 to 150 μm.
기재층(1)은 광학시트를 물리적, 구조적으로 지지하는 역할을 수행한다. 그러나, 기재층(1) 없이 확산층(3)과 제1집광층(2)만으로 충분한 강도가 보장된다면 기재층(1)을 생략할 수도 있다. 기재층(1)은 당업자에게 알려진 공지된 물질로 제조될 수 있다. 예를 들면, 기재층(1)은 투명한 물질로 이루어질 수 있다. 구체적으로, 폴리카보네이트, 폴리술폰, 폴리(메트)아크릴레이트, 폴리스티렌, 폴리비닐클로라이드, 폴리비닐알코올, 폴리노르보넨, 폴리에틸렌테레프탈레이트 등을 포함하는 폴리에스테르가 될 수 있다. 기재층(1)은 상기 예시에 제한되지 않는다. 기재층(1)의 두께는 약 25 내지 300㎛가 될 수 있다. 상기 범위에서, 신뢰성을 확보할 수 있고 제1집광층, 확산층의 적층 시 안정성이 좋을 수 있다.The base layer 1 serves to physically and structurally support the optical sheet. However, the base material layer 1 may be omitted if sufficient strength is ensured only by the diffusion layer 3 and the first light collecting layer 2 without the base material layer 1. The base layer 1 may be made of a material known to those skilled in the art. For example, the base layer 1 may be made of a transparent material. Specifically, it may be a polyester including polycarbonate, polysulfone, poly (meth) acrylate, polystyrene, polyvinylchloride, polyvinyl alcohol, polynorbornene, polyethylene terephthalate and the like. The base material layer 1 is not limited to the said illustration. The thickness of the base layer 1 may be about 25 to 300㎛. In the above range, it is possible to ensure the reliability and stability when laminating the first light collecting layer, the diffusion layer may be good.
제1집광층(2)은 기재층(1)의 상부에 형성되어 있는 제4광학패턴을 의미할 수 있다. 제1집광층(2)은 제2집광층(4), 확산층(3) 및 기재층(1)을 통과한 광에 대해 집광 기능을 수행할 수 있다. 제1집광층(2)의 굴절률은 약 1.5 이상, 예를 들면 약 1.5 내지1.7이 될 수 있다. 상기 범위에서, 집광 효율이 좋을 수 있다.The first light collecting layer 2 may refer to a fourth optical pattern formed on the base layer 1. The first light collecting layer 2 may perform a light collecting function on the light passing through the second light collecting layer 4, the diffusion layer 3, and the base layer 1. The refractive index of the first light collecting layer 2 may be about 1.5 or more, for example, about 1.5 to 1.7. In this range, the light collecting efficiency may be good.
제1집광층(2)을 형성하는 제4광학패턴은 확산층(3) 및/또는 제2집광층(4)에 형성되는 광학패턴과 동일하거나 다를 수 있다. 제4광학패턴은 기재층(1)에 돌출되어 집광 기능을 수행할 수 있는 것이라면, 특별히 제한되지 않는다. 예를 들면, 제4광학패턴은 프리즘, 렌티큘러 렌즈, 마이크로렌즈, 엠보 등이 될 수 있고, 프리즘은 단면 형상이 삼각형, 사다리꼴 등의 다각형, 반원형, 반타원형 중 하나가 될 수 있다. 제4광학패턴 사이에는 이격 평면이 형성될 수도 있다. 프리즘은 단면 형상이 삼각형, 반원형, 사다리꼴 중 하나가 될 수 있다. 프리즘의 높이는 약 1 내지 100㎛, 폭은 약 1 내지 200㎛가 될 수 있다. 렌티큘러, 마이크로렌즈, 엠보 패턴의 직경은 약 1 내지 200㎛, 높이는 약 1 내지 120㎛가 될 수 있고, 엠보 패턴은 평균 표면 조도(Ra)가 약 0.1 내지 10㎛이고, 표면조도의 최대값(Rmax)이 약 0.2 내지 20㎛가 될 수 있다. 제1집광층(2)의 광학패턴의 높이와 폭은 제한되지 않지만, 집광 효율을 고려하여 높이가 약 1 내지 100㎛, 폭이 약 1 내지 200㎛가 될 수 있다. 제1집광층(2)은 확산층(3) 또는 제2집광층(4)과 동일하거나 또는 다른 종류의 수지로 구현될 수 있다. 예를 들면, 제1집광층(2)은 (메트)아크릴계 수지, UV 경화형 우레탄 (메트)아크릴계 수지, 폴리카보네이트계 수지, 폴리에틸렌 나프탈레이트 수지 등의 폴리에스테르계 수지 및 이들의 혼합물로 구성될 수 있다. The fourth optical pattern for forming the first light collecting layer 2 may be the same as or different from the optical pattern formed in the diffusion layer 3 and / or the second light collecting layer 4. The fourth optical pattern is not particularly limited as long as it protrudes from the base layer 1 to perform a light condensing function. For example, the fourth optical pattern may be a prism, a lenticular lens, a microlens, an emboss, or the like, and the prism may be one of a polygonal, semicircular, semi-elliptic, triangular, and trapezoidal cross-sectional shape. A separation plane may be formed between the fourth optical patterns. Prisms can be one of triangle, semicircle, or trapezoid in cross-sectional shape. The height of the prism may be about 1 to 100 μm and the width may be about 1 to 200 μm. The diameter of the lenticular, microlens, and emboss patterns may be about 1 to 200 μm, and the height may be about 1 to 120 μm, and the emboss pattern has an average surface roughness (Ra) of about 0.1 to 10 μm and a maximum value of surface roughness ( R max) may be about 0.2 to 20 μm. The height and width of the optical pattern of the first light collecting layer 2 are not limited, but may be about 1 to 100 μm in height and about 1 to 200 μm in width in consideration of light collection efficiency. The first light collecting layer 2 may be made of the same or different type of resin as the diffusion layer 3 or the second light collecting layer 4. For example, the first light collecting layer 2 may be composed of polyester resins such as (meth) acrylic resins, UV curable urethane (meth) acrylic resins, polycarbonate resins, polyethylene naphthalate resins, and mixtures thereof. have.
제2집광층(4)과 확산층(3) 중 하나 이상은 유기 또는 무기 입자를 더 포함함으로써 그 효과를 더 강화할 수 있다. 유기 또는 무기 입자는 확산층(3) 또는 제2집광층(4)에 랜덤하게 포함될 수 있다. At least one of the second light collecting layer 4 and the diffusion layer 3 may further enhance the effect by further including organic or inorganic particles. Organic or inorganic particles may be randomly included in the diffusion layer 3 or the second light collecting layer 4.
이하, 도 3을 참조하여 본 발명의 다른 구체예에 따른 광학시트에 대하여 설명한다. 도 3은 본 발명 다른 구체예의 광학시트의 단면도이다. 도 3을 참조하면, 광학 시트(200)는 기재층(1), 기재층(1) 상부면에 형성된 제1집광층(2), 기재층(1) 하부면에 형성된 확산층(3), 및 확산층(3) 하부면에 형성된 제2집광층(4)을 포함하고, 확산층(3)에는 유기 또는 무기 입자(5)가 포함되어 있을 수 있다.Hereinafter, an optical sheet according to another embodiment of the present invention will be described with reference to FIG. 3. 3 is a cross-sectional view of an optical sheet of another embodiment of the present invention. Referring to FIG. 3, the optical sheet 200 includes a base layer 1, a first condensing layer 2 formed on an upper surface of the base layer 1, a diffusion layer 3 formed on a lower surface of the base layer 1, and The second light collecting layer 4 formed on the bottom surface of the diffusion layer 3 may be included, and the diffusion layer 3 may include organic or inorganic particles 5.
유기 또는 무기 입자(5)는 제2집광층(4) 또는 확산층(3)을 이루는 수지의 굴절률과 다른 굴절률을 가지는 재료를 사용하여 굴절률의 차이에 의해 빛을 산란시켜, 확산층(3)의 전면적에 걸쳐 분산됨으로써 차폐력을 향상시킬 수 있다.The organic or inorganic particles 5 scatter light due to the difference in refractive index by using a material having a refractive index different from that of the resin constituting the second light concentrating layer 4 or the diffusion layer 3, and thus the entire area of the diffusion layer 3. By dispersing over, the shielding force can be improved.
유기 또는 무기 입자(5)의 굴절률은 약 1.46 내지 1.55가 될 수 있다. 유기 또는 무기 입자(5)는 확산성 입자로서 실리콘계, 나일론계, (메트)아크릴계, 폴리스티렌(PS), 실리카, PMMA(폴리메틸메타아크릴레이트) 등이 될 수 있다. 유기 또는 무기 입자(5)는 제한되지 않지만 구형의 비드 형태를 가질 수 있다. 유기 또는 무기 입자(5)의 크기 또는 직경은 제한되지 않지만, 약 1 내지 15㎛가 될 수 있다. 상기 범위에서, 광 확산 특성을 구현할 수 있다.The refractive index of the organic or inorganic particles 5 may be about 1.46 to 1.55. The organic or inorganic particles 5 may be silicon-based, nylon-based, (meth) acrylic-based, polystyrene (PS), silica, PMMA (polymethylmethacrylate), or the like as the diffusing particles. The organic or inorganic particles 5 may have a spherical bead form although not limited thereto. The size or diameter of the organic or inorganic particles 5 is not limited, but may be about 1 to 15 μm. In the above range, it is possible to implement the light diffusion characteristics.
확산층(3) 중 유기 또는 무기 입자(5)의 함량을 조절함으로써 빛의 확산율을 조절할 수 있다. 예를 들면, 유기 또는 무기 입자(5)는 휘도 저하를 최소화하기 위하여 확산층 중 약 1 내지 30중량%, 예를 들면 약 1 내지 10중량%로 포함될 수 있다. 상기 범위에서, 광 확산 특성을 구현할 수 있다.By controlling the content of the organic or inorganic particles (5) in the diffusion layer (3) it is possible to control the diffusion rate of light. For example, the organic or inorganic particles 5 may be included in about 1 to 30% by weight of the diffusion layer, for example about 1 to 10% by weight in order to minimize the decrease in brightness. In the above range, it is possible to implement the light diffusion characteristics.
도면에는 도시하지 않았으나, 제2집광층 역시 광 확산 특성의 구현을 위해 유기 또는 무기 입자를 제2집광층 중 약 1 내지 30중량%, 예를 들면 약 1 내지 10중량%로 포함할 수 있다. 상기 범위에서, 광 확산 특성을 구현할 수 있다.Although not shown in the drawings, the second light collecting layer may also include organic or inorganic particles in an amount of about 1 to 30% by weight, for example, about 1 to 10% by weight, of the second light collecting layer in order to implement light diffusing characteristics. In the above range, it is possible to implement the light diffusion characteristics.
본 발명의 광학 시트는 종래 다층 구조에서 사용되는 접합(lamination) 방식이 아닌 기재층에 대한 코팅 및 패턴 형성 방식에 의해 제조될 수 있다. 일 구체예에 의하면, 기재층에 제1집광층, 확산층 또는 제2집광층 형성용 수지와 광개시제의 혼합물을 이용하며 패턴이 형성된 인각 롤을 사용하고 자외선을 조사하여 패턴을 형성할 수 있다. 제1집광층, 제2집광층의 패턴 형성 순서는 특별히 제한되지 않는다. 이와 같이, 본 발명의 광학시트는 확산층이 형성된 기재층, 집광층이 형성된 또 다른 기재층을 접합하는 방식이 아닌 단일 기재층의 양면에 코팅하는 방식으로 집광층과 확산층을 동시에 적층함으로써 광학시트를 구성하는 층의 개수를 줄이면서도 집광과 확산의 기능의 복합화를 구현할 수 있다. 본 발명의 광학 시트는 프리즘 시트와 확산 시트의 기능을 동시에 구현하는 복합 시트로 사용될 수 있다.The optical sheet of the present invention may be manufactured by a coating and pattern forming method for a base layer rather than a lamination method used in a conventional multilayer structure. According to one embodiment, a pattern may be formed by using a stamping roll formed with a pattern using a mixture of a resin for forming a first condensing layer, a diffusion layer, or a second condensing layer and a photoinitiator, and irradiating ultraviolet rays. The order of pattern formation of the first light collecting layer and the second light collecting layer is not particularly limited. As described above, the optical sheet of the present invention is laminated on the optical sheet by simultaneously stacking the light collecting layer and the diffusing layer in a manner of coating on both sides of a single base layer rather than bonding the base layer having the diffusion layer and another base layer having the light collecting layer. While reducing the number of layers constituting, it is possible to realize a combination of the functions of condensing and diffusing. The optical sheet of the present invention can be used as a composite sheet that simultaneously implements the functions of the prism sheet and the diffusion sheet.
본 발명의 다른 관점인 디스플레이장치는 상기 광학 시트를 포함할 수 있다. 디스플레이장치는 제한되지 않지만, 액정표시장치를 포함할 수 있다. 액정표시장치는 도광판, 상기 광학시트, 액정표시판넬을 포함할 수 있고, 광학 시트는 도광판 상부에 위치될 수 있다.According to another aspect of the present invention, a display device may include the optical sheet. The display device is not limited, but may include a liquid crystal display device. The liquid crystal display device may include a light guide plate, the optical sheet, and a liquid crystal display panel, and the optical sheet may be positioned on the light guide plate.
이하, 본 발명의 바람직한 실시 예를 통해 본 발명의 구성 및 작용을 더욱 상세히 설명하기로 한다. 다만, 이는 본 발명의 바람직한 예시로 제시된 것이며 어떠한 의미로도 이에 의해 본 발명이 제한되는 것으로 해석될 수는 없다.Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.
실시예 1Example 1
폴리에틸렌테레프탈레이트 필름(두께 250㎛)을 기재층으로 하고, 기재층 상부면에 굴절률이 1.55인 아크릴계 경화형 수지를 코팅하고 프리즘 패턴이 형성된 몰드에 투입하여 roll to roll 방식에서 자외선에 노출하여 단면이 삼각형 형상인 프리즘류의 제1집광층을 형성하였다. 기재층 하부면에, 굴절률이 1.47인 UV 경화형 우레탄 아크릴레이트 수지를 코팅하고 엠보 패턴이 형성된 몰드에 투입하여 roll to roll 방식에서 자외선에 노출하여 하부면에 엠보 패턴이 형성된 확산층을 기재층 하부면에 형성하였다. 하부면에 엠보 패턴이 형성된 확산층 하부면에 굴절률이 1.59인 UV 경화형 우레탄 아크릴레이트 수지를 코팅하고 엠보 패턴이 형성된 몰드에 투입하여 roll to roll 방식에서 자외선에 노출하여 하부면에 엠보 패턴이 형성된 제2집광층을 확산층 하부면에 형성하였다.A polyethylene terephthalate film (thickness of 250 μm) is used as a base layer, and an acrylic curable resin having a refractive index of 1.55 is coated on the top surface of the base layer, and then put into a mold having a prism pattern. The first light collecting layer of prisms having a shape was formed. On the lower surface of the base layer, a UV curable urethane acrylate resin having a refractive index of 1.47 was coated and put into a mold having an embossed pattern. The diffusion layer having the embossed pattern formed on the lower surface was exposed to ultraviolet rays in a roll to roll method. Formed. Coating a UV curable urethane acrylate resin having a refractive index of 1.59 on a lower surface of the diffusion layer having an embossed pattern formed on the lower surface thereof, and then applying the UV curable urethane acrylate resin to a mold having an embossed pattern; A light collecting layer was formed on the bottom surface of the diffusion layer.
실시예 2 내지 8Examples 2 to 8
실시예 1에서 제1집광층, 확산층 및 제2집광층의 광학패턴을 하기 표 1과 같이 변경한 것을 제외하고는 동일한 방법을 실시하여 광학 시트를 제조하였다. 실시예에서 유기 또는 무기 입자로는 아크릴계 재질의 비드(확산층 중 5중량%)를 사용하였다.An optical sheet was manufactured in the same manner as in Example 1, except that the optical patterns of the first light collecting layer, the diffusion layer, and the second light collecting layer were changed as shown in Table 1 below. In the examples, beads of acrylic material (5 wt% in the diffusion layer) were used as the organic or inorganic particles.
비교예 1 내지 3Comparative Examples 1 to 3
실시예 1에서 확산층과 제2집광층을 포함하지 않거나(비교예 1), 제2집광층을 포함하지 않거나(비교예 2), 확산층과 제2집광층을 포함하더라도 확산층과 제2집광층의 경계면에 제1광학패턴이 형성되지 않은 Flat 형태인 것(비교예 3)을 제외하고는 동일한 방법을 실시하여 광학 시트를 제조하였다.In Example 1, even if the diffusion layer and the second light collecting layer are not included (Comparative Example 1), the second light collecting layer is not included (Comparative Example 2), or the diffusion layer and the second light collecting layer are included, An optical sheet was manufactured by the same method as the flat type except that the first optical pattern was not formed on the interface (Comparative Example 3).
실시예와 비교예의 광학시트에 대해 하기의 물성을 평가하고 그 결과를 하기 표 1에 나타내었다.The following physical properties were evaluated for the optical sheets of Examples and Comparative Examples and the results are shown in Table 1 below.
물성 평가 방법Property evaluation method
(1)휘도:직하형 또는 엣지형 LED 타입의 광원을 포함하는 백라이트 유닛에 광학시트를 조립하고 휘도를 측정한다. 휘도는 BM-7 분광방사계(TOPCON社)를 사용하여 측정한다. 휘도는 비교예 1의 휘도 값에 대한 백분율(%)로 나타내었다.(1) Brightness: An optical sheet is assembled to a backlight unit including a light source of a direct type or edge type LED and the luminance is measured. Luminance is measured using a BM-7 spectroradiometer (TOPCON). Luminance is expressed as a percentage (%) of the luminance value of Comparative Example 1.
(2)차폐성:차폐성은 광학시트를 백라이트 유닛의 도광판 위에 적층하였을 때 도광판 상면의 패턴이 시인될 수 있는지 여부를 나타낸 것이다. 엣지 LED 광원을 사용하는 32인치 LCD 모듈을 점등한 상태에서 도광판에 광학시트를 올려 놓은 후 도광판 상편의 패턴이 시인되는지 여부를 육안으로 평가한다. 평가 기준은 0부터 10으로 하였고, "0"은 차폐성이 전혀 없어 도광판의 패턴이 그대로 시인되는 것이고, "10"은 차폐성이 좋아 도광판의 패턴이 전혀 시인되지 않는 것으로, 0에서부터 10으로 갈수록 차폐성이 좋음을 의미한다.(2) Shielding property: Shielding property shows whether or not the pattern of the upper surface of the light guide plate can be seen when the optical sheet is laminated on the light guide plate of the backlight unit. After the 32-inch LCD module using the edge LED light source is turned on, the optical sheet is placed on the light guide plate and visually evaluates whether the pattern on the top of the light guide plate is visible. Evaluation criteria were 0 to 10, and "0" means that the light guide plate pattern is recognized as it is because there is no shielding at all, and "10" means that the pattern of the light guide plate is not seen at all. It means good.
표 1
제1집광층 확산층 제2집광층 휘도 차폐성
패턴유형 패턴유형 비드 포함 여부 패턴유형 비드 포함 여부 % 0~10
실시예 1 프리즘 엠보 미포함 엠보 미포함 90 7
실시예 2 프리즘 엠보 포함 엠보 미포함 85 8
실시예 3 렌티큘러 엠보 미포함 엠보 미포함 80 8
실시예 4 마이크로렌즈 엠보 미포함 엠보 미포함 65 10
실시예 5 엠보 엠보 미포함 엠보 미포함 50 10
실시예 6 프리즘 프리즘 미포함 엠보 미포함 95 9
실시예 7 프리즘 프리즘 포함 엠보 미포함 90 10
실시예 8 엠보 프리즘 미포함 엠보 미포함 70 10
비교예 1 프리즘 - - - - 100 2
비교예 2 프리즘 엠보 미포함 - - 95 5
비교예 3 프리즘 Flat 미포함 Flat 미포함 100 2
Table 1
First light collecting layer Diffusion layer Second light collecting layer Luminance Shielding
Pattern Type Pattern Type Bead Included Pattern Type Bead Included % 0-10
Example 1 prism Emboss Without Emboss Without 90 7
Example 2 prism Emboss include Emboss Without 85 8
Example 3 Lenticular Emboss Without Emboss Without 80 8
Example 4 Microlens Emboss Without Emboss Without 65 10
Example 5 Emboss Emboss Without Emboss Without 50 10
Example 6 prism prism Without Emboss Without 95 9
Example 7 prism prism include Emboss Without 90 10
Example 8 Emboss prism Without Emboss Without 70 10
Comparative Example 1 prism - - - - 100 2
Comparative Example 2 prism Emboss Without - - 95 5
Comparative Example 3 prism Flat Without Flat Without 100 2
상기 표 1에서 나타난 바와 같이, 본 발명의 광학시트는 적정 휘도를 확보하면서도 차폐성을 높았다. 반면에, 확산층과 제2집광층을 포함하지 않거나 제2집광층을 포함하지 않는 비교예 1-2, 확산층과 제2집광층을 포함하더라도 경계면에 광학패턴이 형성되지 않은 비교예 3의 광학 시트는 차폐성이 좋지 않았다.As shown in Table 1, the optical sheet of the present invention had high shielding property while ensuring appropriate luminance. On the other hand, Comparative Example 1-2, which does not include the diffusion layer and the second light collecting layer or does not include the second light collecting layer, the optical sheet of Comparative Example 3 in which the optical pattern is not formed on the interface even when the diffusion layer and the second light collecting layer are included. Was not good shielding.
본 발명은 상기 실시예 및 도면에 의해 한정되는 것이 아니라 서로 다른 다양한 형태가 될 수 있고, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자는 본 발명의 기술적 사상이나 필수적인 특징을 변경하지 않고 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 것이다. 그러므로, 이상에서 기술한 실시예와 도면은 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야 한다.The present invention is not limited to the above embodiments and drawings, but may be in various forms, and a person skilled in the art to which the present invention pertains does not change the technical spirit or essential features of the present invention. It will be appreciated that it may be implemented in a form. Therefore, it is to be understood that the embodiments and drawings described above are exemplary in all respects and not restrictive.

Claims (9)

  1. 상기 기재층의 일면 상에 형성된 제1 집광층,A first light collecting layer formed on one surface of the base layer,
    상기 기재층의 타면 상에 형성된 확산층, 및 A diffusion layer formed on the other surface of the substrate layer, and
    상기 확산층 상에 형성된 제2집광층을 포함하고,A second light collecting layer formed on the diffusion layer,
    상기 제1 집광층과 상기 제2집광층은 각각 상기 확산층 대비 고굴절률을 가지고, 상기 확산층과 상기 제2집광층의 경계면에는 제1 광학패턴이 형성된 광학 시트.The first condensing layer and the second condensing layer each have a higher refractive index than the diffusion layer, and an optical sheet having a first optical pattern formed on the interface between the diffusion layer and the second condensing layer.
  2. 제1항에 있어서, 상기 제1 집광층 및 상기 제2집광층의 굴절률은 각각 약 1.5 이상이고, 상기 확산층의 굴절률은 약 1.5 미만인 광학시트.The optical sheet of claim 1, wherein the refractive indexes of the first light collecting layer and the second light collecting layer are each about 1.5 or more, and the refractive index of the diffusion layer is less than about 1.5.
  3. 제1항에 있어서, 상기 제1 광학패턴은 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함하는 광학시트.The optical sheet of claim 1, wherein the first optical pattern comprises at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  4. 제1항에 있어서, 상기 제2집광층의 하부면에 제2 광학패턴이 더 형성된 광학시트.The optical sheet of claim 1, wherein a second optical pattern is further formed on a lower surface of the second light collecting layer.
  5. 제4항에 있어서, 상기 제2 광학패턴은 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함하는 광학시트.The optical sheet of claim 4, wherein the second optical pattern comprises at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  6. 제1항에 있어서, 상기 제1집광층에는 프리즘, 렌티큘러, 마이크로렌즈, 엠보 패턴 중 하나 이상을 포함하는 제4광학패턴이 형성된 광학시트.The optical sheet of claim 1, wherein the first light collecting layer includes a fourth optical pattern including at least one of a prism, a lenticular, a microlens, and an embossed pattern.
  7. 제1항에 있어서, 상기 상기 확산층과 상기 제2집광층 중 하나 이상은 유기 또는 무기 입자를 더 포함하는 광학시트.The optical sheet of claim 1, wherein at least one of the diffusion layer and the second light collecting layer further comprises organic or inorganic particles.
  8. 제7항에 있어서, 상기 유기 또는 무기 입자는 실리콘계, 나일론계, (메트)아크릴계, 폴리스티렌(PS), 실리카, PMMA(폴리메틸메타아크릴레이트) 중 1종 이상을 포함하는 광학시트.The optical sheet of claim 7, wherein the organic or inorganic particles include at least one of silicon, nylon, (meth) acrylic, polystyrene (PS), silica, and PMMA (polymethylmethacrylate).
  9. 제1항 내지 제8항 중 어느 한 항의 광학시트를 포함하는 디스플레이 장치.Display device comprising the optical sheet of any one of claims 1 to 8.
PCT/KR2013/006417 2012-07-25 2013-07-18 Optical sheet and display device comprising same WO2014017778A1 (en)

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