WO2009069977A2 - Feuille optique multifonctionnelle - Google Patents

Feuille optique multifonctionnelle Download PDF

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Publication number
WO2009069977A2
WO2009069977A2 PCT/KR2008/007063 KR2008007063W WO2009069977A2 WO 2009069977 A2 WO2009069977 A2 WO 2009069977A2 KR 2008007063 W KR2008007063 W KR 2008007063W WO 2009069977 A2 WO2009069977 A2 WO 2009069977A2
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WO
WIPO (PCT)
Prior art keywords
light
optical sheet
parts
layer
multifunctional optical
Prior art date
Application number
PCT/KR2008/007063
Other languages
English (en)
Other versions
WO2009069977A3 (fr
Inventor
Kyoung Hwa Kim
Dae Shik Kim
Hyo Jin Lee
Original Assignee
Kolon Industries, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kolon Industries, Inc. filed Critical Kolon Industries, Inc.
Priority to US12/745,383 priority Critical patent/US20110026124A1/en
Priority to CN2008801186320A priority patent/CN101883995A/zh
Priority claimed from KR1020080119663A external-priority patent/KR20090056903A/ko
Publication of WO2009069977A2 publication Critical patent/WO2009069977A2/fr
Publication of WO2009069977A3 publication Critical patent/WO2009069977A3/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements

Definitions

  • the present invention relates to a multifunctional optical sheet for use in liquid crystal displays.
  • LCDs liquid crystal displays
  • PDPs plasma display panels
  • FEDs field emission displays
  • organic electroluminescent displays are technologically intensive products resulting from a combination of liquid crystal- semiconductor techniques and are advantageous because they are thin and lightweight and consume little power.
  • LCDs which have already been applied to fields such as notebook computers, monitors for desktop computers and portable personal communication devices (PDAs and mobile phones) , are being manufactured in larger sizes, and thus it is possible to apply LCDs to large-sized TVs such as HD
  • the LCD serving as a device for adjusting light transmittance using the electrical properties of a liquid crystal material, emits light from a light source lamp mounted to the back surface thereof, and the light thus emitted is passed through various functional prism films or sheets to thus cause light to be uniform and directional, after which such controlled light is also passed through a color filter, thereby realizing red, green, and blue (R, G, B) colors.
  • the LCD is of an indirect light emission type, which realizes an image by controlling the contrast of each pixel through an electrical method.
  • a light- emitting device provided with a light source is regarded as important in determining the quality of the image of the LCD, including luminance and uniformity.
  • a light-emitting device is mainly exemplified by a backlight unit.
  • a backlight unit causes light to be emitted using a light source such as a cold cathode fluorescent lamp (CCFL) , so that such emitted light is sequentially passed through a light guide plate, a light diffusion member such as a light diffusion sheet or a light diffusion plate, and a prism sheet, thus reaching a liquid crystal panel.
  • CCFL cold cathode fluorescent lamp
  • the light guide plate functions to transfer light emitted from the light source in order to distribute it over the entire front surface of the liquid crystal panel, which is planar, and the light diffusion member plays a role in realizing uniform light intensity over the entire front surface of a screen.
  • the prism sheet functions to control the light path so that light traveling in various directions through the light diffusion member is transformed within a range of viewing angles ⁇ suitable for enabling the image to be viewed by an observer.
  • a reflection sheet is provided under the light guide plate to reflect light, which does not reach the liquid crystal panel and is outside of the light path, so that such light is used again, thereby increasing the efficient use of the light source.
  • a plurality of films having various functions is provided. As a result of the use of the plurality of sheets, however, light interference occurs, and further, the films may become damaged owing to physical contact between the sheets, undesirably causing problems such as low productivity and high cost.
  • the present inventors have verified that luminance may be sufficiently increased while minimizing the use of optical sheets for increasing luminance, hiding performance may be additionally improved, and the good quality of emitted light may be maintained, thus completing the present invention.
  • the present inventors have devised a multifunctional optical sheet which is composed of a reduced number of sheets but is able to exhibit the same functions as those of a conventional case in which a light diffusion member and a prism sheet are mounted, thereby solving the problems due to the use of the plurality of sheets and remarkably reducing the manufacturing process and the costs thereof.
  • the present invention provides a multifunctional optical sheet, which is capable of exhibiting luminance equivalent to that of a conventional case in which a prism sheet is layered on a light diffusion member .
  • the present invention provides a multifunctional optical sheet, which is capable of imparting appropriate hiding performance.
  • the present invention provides a multifunctional optical sheet, in which the number of sheets to be mounted in a backlight unit is reduced, thus making a display thinner.
  • a preferred embodiment of the present invention provides a multifunctional optical sheet, including a substrate layer; a light diffusion layer formed on one surface or both surfaces of the substrate layer and including a binder resin and light-diffusing particles; an air layer formed on the light diffusion layer and including a binder resin and foamed beads; and a light-collecting layer formed on the air layer.
  • Another preferred embodiment of the present invention provides a multifunctional optical sheet, including a substrate layer; a light diffusion layer formed on one surface or both surfaces of the substrate layer and including a binder resin and light-diffusing particles; and a light-collecting layer formed on the light diffusion layer and including a photosensitive resin composition and foamed beads .
  • a further preferred embodiment of the present invention provides a multifunctional optical sheet, including a substrate layer; and a light-collecting layer formed on one surface or both surfaces of the substrate layer and including a photosensitive resin composition, light-diffusing particles and foamed beads.
  • the foamed beads may be formed by mixing a resin for a layer including the foamed beads with a foaming agent thus preparing a mixture, applying the mixture on a predetermined coating surface, and then heating the applied mixture to thus be foamed .
  • the foamed beads may be contained in the air layer in an amount of 30-300 parts by weight based on 100 parts by weight of the binder resin.
  • the air layer may have a thickness of 2-100 jM.
  • the binder resin for the air layer may be acrylic polyol.
  • the foamed beads may be contained in the light-collecting layer in an amount of 1-30 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • the foamed beads may have a diameter of 2-100 ⁇ m.
  • the light- collecting layer may have a linear or non-linear array pattern of any prism structure selected from among a polypyramidal structure, a conical structure, a hemispherical structure, and a non-spherical structure.
  • the light- diffusing particles may have a diameter of 1-80 ⁇ m.
  • the light-diffusing particles in the case where the light-diffusing particles are contained in the light diffusion layer, the light-diffusing particles may be used in an amount of 50-300 parts by weight based on 100 parts by weight of the binder resin.
  • the light-diffusing particles In the case where the light-diffusing particles are contained in the light- collecting layer, the light-diffusing particles may be used contained in an amount of 1-15 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • the multifunctional optical sheet can improve luminance while uniformly diffusing light emitted from a light source, can realize superior hiding performance, can remarkably simplify the manufacturing process compared to a conventional case in which a light diffusion member and a prism sheet are separately mounted, can reduce the manufacturing cost, and enables the manufacture of a thinner LCD.
  • the multifunctional optical sheet can prevent the loss of light due to light interference, scattering or absorption occurring as a result of the use of a plurality of sheets, and can also prevent damage to the sheets.
  • the multifunctional optical sheet can reduce the number of sheets to be mounted in a backlight unit, thus realizing a thinner display.
  • FIG. 1 is a cross-sectional view showing a multifunctional optical sheet according to a preferred embodiment of the present invention.
  • FIGS. 2 and 3 are cross-sectional views showing a multifunctional optical sheet according to other preferred embodiments of the present invention. ⁇ Description of the Reference Numerals in the Drawing>
  • substrate layer 20 light diffusion layer
  • FIG. 1 is a cross-sectional view showing a multifunctional optical sheet according to a preferred embodiment of the present invention
  • FIGS. 2 and 3 are cross-sectional views showing a multifunctional optical sheet according to other preferred embodiments of the present invention.
  • the same reference numerals refer to the same elements for convenience, but this does not mean that they are the same as each other in terms of the composition and the form.
  • the multifunctional optical sheet may have a structure composed of a substrate layer 10 and a light-collecting layer 40 formed on one surface or both surfaces thereof. Also, a light diffusion layer 20 may be further disposed between the substrate layer 10 and the light-collecting layer 40.
  • the multifunctional optical sheet includes foamed beads 35 and light-diffusing particles 25, and the present invention may be embodied as follows depending on the structure of a layer including foamed beads or light-diffusing particles.
  • a multifunctional optical sheet may be composed of a substrate layer 10, a light diffusion layer 20 including light-diffusing particles 25 formed on one surface or both surfaces of the substrate layer 10, an air layer 30 including foamed beads 35 formed on the light diffusion layer 20, and a light-collecting layer 40 formed on the air layer 30.
  • a multifunctional optical sheet may be composed of a substrate layer 10, a light diffusion layer 20 including light-diffusing particles 25 formed on one surface or both surfaces of the substrate layer 10, and a light-collecting layer 40 including foamed beads 35 formed on the light diffusion layer 20.
  • a multifunctional optical sheet may be composed of a substrate layer 10, and a light-collecting layer 40 including light-diffusing particles 25 and foamed beads 35 formed on one surface or both surfaces of the substrate layer 10.
  • the multifunctional optical sheet according to the present invention includes the air layer 30 or the light- collecting layer 40, having the foamed beads 35, at an appropriate position on the substrate layer 10, in order to prevent the reduction of luminance as a result of the absence of an air layer due to attachment of a light diffusion member and a prism sheet.
  • the light-diffusing particles 25 are used to impart a light diffusion function, and also, the foamed beads 35 are used to form an air layer, thus preventing the reduction of luminance.
  • the foamed beads 35 are formed by mixing a binder resin for a layer including foamed beads with a foaming agent thus preparing a mixture, applying the mixture, and heating the applied mixture to thus be foamed.
  • the resin for the layer including the foamed beads 35 namely, for the air layer 30 or the light- collecting layer 40, is mixed with the foaming agent, after which the mixture is applied on a coating surface, namely, the upper surface of the light diffusion layer 20 or the substrate layer 10, and then heated so that the foaming agent is foamed while evaporating.
  • the foaming agent is in the form of beads having a core-shell double structure.
  • the core of the foaming agent is foamed upon evaporation, resulting in the foamed beads 35 containing air.
  • the foamed beads 35 may have a diameter of 2-100 ⁇ m. , which is 1.2 ⁇ 2 times the diameter of the foaming agent before being foamed.
  • the foamed beads 35 are contained in an amount of 30 ⁇ 300 parts by weight based on 100 parts by weight of the binder resin.
  • the foamed beads 35 are contained in an amount of 1-30 parts by weight based on 100 parts by weight of a photosensitive resin composition.
  • the foaming agent is not particularly limited, but examples thereof include isobutane or isopentane. To adequately foam the foaming agent, 60 ⁇ 200 ° C heat may be applied for 3 ⁇ 300 sec. Additionally, the foaming agent may be foamed even by being heated with a UV curing lamp upon light curing.
  • the binder resin for the air layer 30 may include acrylic polyol, or any resin selected from among binder resins for the light diffusion layer which will be described below. The mixture of the binder resin and the foaming agent is foamed, thereby forming the foamed beads 35.
  • the thickness of the air layer 30 may be set to 2-100 ⁇ m.
  • the substrate layer examples include a polyethyleneterephthalate film, a polycarbonate film, a polypropylene film, a polyethylene film, a polystyrene film, and a polyepoxy film. Particularly useful is a polyethyleneterephthalate film or a polycarbonate film.
  • the thickness of the substrate layer 10 may be set to 10 ⁇ 1000
  • IM preferably 15 ⁇ 400 [M, in order to realize superior mechanical strength, thermal stability, and flexibility and prevent the loss of transmitted light.
  • the light diffusion layer 20 is obtained by dispersing light-diffusing particles in a binder resin.
  • the binder resin for the light diffusion layer includes a resin that adheres well to the substrate layer 10 and has good compatibility with light-diffusing particles 25 dispersed therein, for example, a resin in which light-diffusing particles 25 are uniformly dispersed so that they are not separated or precipitated.
  • binder resin examples include acrylic resin, including homopolymers, copolymers, or terpolymers of unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n- butyl methacrylate, n-butylmethyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methylolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, and 2- ethylhexyl acrylate, urethane resin, epoxy resin, and melamine resin.
  • acrylic resin including homopolymers, copolymers, or terpolymers of unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate
  • the light-diffusing particles 25 include various organic or inorganic particles.
  • the organic particles include acrylic particles including homopolymers or copolymers of methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, methylolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate, olefin particles including polyethylene, polystyrene and polypropylene, acryl-olefin copolymer particles, and multilayer multicomponent particles prepared by forming a layer of homopolymer particles and then forming a layer of another type of monomer thereon.
  • inorganic particles examples include silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, and magnesium fluoride.
  • Such organic and inorganic particles are merely illustrative, are not limited to the examples listed above, and may be replaced with other known materials as long as the main purpose of the present invention is achieved, as will be apparent to those skilled in that art. The case in which the type of material is changed also falls within the technical scope of the present invention.
  • the light-diffusing particles 25 may be dispersed in a single layer or multiple layers, and may have a diameter of l ⁇ 80 ⁇ m.
  • the light-diffusing particles are contained in an amount of 50-300 parts by weight based on 100 parts by weight of the binder resin. In the case where the light- diffusing particles having the aforementioned diameter are contained in the aforementioned amount, white turbidity and separation of the particles can be prevented and appropriate light diffusion effects can be realized.
  • the thickness of the light diffusion layer 20 may be set to 5-100 ⁇ m.
  • the light-collecting layer 40 of the multifunctional optical sheet according to the present invention may be formed using a polymer resin including a UV curable resin or a heat curable resin.
  • a resin composition that is very transparent and is capable of forming a crosslink bond adequate for maintaining the shape of an optical structure. Examples thereof include epoxy resin-Lewis acid or polyethylol, unsaturated polyester-styrene, and acrylic or methacrylic acid ester.
  • the light-collecting layer 40 may include the foamed beads 35 as above or the light- diffusing particles 25.
  • the light-diffusing particles 25 are as mentioned above, and the amount thereof may be set to 1-15 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • the light-collecting layer 40 may have a linear or non-linear array pattern of any prism structure selected from among a polypyramidal structure, a conical structure, a hemispherical structure, and a non-spherical structure.
  • the thickness of the light-collecting layer 40 may be set to 5-100 ⁇ m-
  • the light-diffusing particles 25 function to uniformly diffuse light passed through the substrate layer 10, and the foamed beads 35 functioning as the air layer play a role in preventing the reduction of luminance and aiding the diffusion of light.
  • the light thus diffused and refracted is directly passed through the light-collecting layer 40, and thus the loss of light is drastically reduced compared to conventional cases.
  • sheets which are conventionally separately provided to impart the diffusion of light and the increase in luminance can be manufactured at once.
  • a sheet including such a multifunctional sheet can realize luminance equivalent to that of a conventional case in which a light diffusion member and a prism sheet are separately used, and also, can diffuse light, thus improving hiding performance and reducing the manufacturing process and the manufacturing cost.
  • the number of mounted sheets may be desirably reduced.
  • the present invention provides a backlight unit assembly formed by disposing an optical film on any one surface of the multifunctional optical sheet, thereby further increasing luminance compared to when only the multifunctional optical sheet is mounted.
  • spherical polymethylmethacrylate particles MH20F available from Kolon
  • spherical polymethylmethacrylate particles MH20F having an average diameter of 20 ⁇ m and a refractive index of 1.49 were added to the binder resin in an amount of 150 parts by weight based on the amount of the binder resin and then monodispersed in a single layer using a milling machine, after which the dispersion thus obtained was applied on one surface of a super-transparent polyethyleneterephthalate
  • PET film FHSS available from Kolon
  • an air layer was formed through the following procedures. Specifically, 100 parts by weight of acrylic resin 52-666 (available from Aekyung Chemical) was diluted with 50 parts by weight of methylethylketone and 90 parts by weight of toluene, thus preparing a binder resin having a refractive index of 1.49. Thereafter, isobutane particles were added to the binder resin in an amount of 50 parts by weight based on 100 parts by weight of the binder resin and then monodispersed in a single layer using a milling machine, after which the dispersion thus obtained was applied using a gravure coater to form a dry thickness of 20 jM. After gravure coating, heat treatment at 120 ° C for 60 sec was performed, thus obtaining the air layer including the isobutane particles having an average diameter of 15 /an.
  • a photosensitive resin composition composed of 60 parts by weight of urethane acrylate, 20 parts by weight of 2- phenylethyl methacrylate, 10 parts by weight of benzylmethacrylate, 5 parts by weight of isobutyl methacrylate, 3 parts by weight of 1, 6-hexanediol acrylate and 2 parts by weight of a BAPO-based photoinitiator was applied, and the upper surface of the frame of a prism- shaped roller was coated with the photosensitive resin composition applied on the air layer, after which UV light
  • a binder resin having a refractive index of 1.49 was diluted with 30 parts by weight of methylethylketone and 80 parts by weight of toluene, thus preparing a binder resin having a refractive index of 1.49. Thereafter, spherical polymethylmethacrylate particles MH20F (available from Kolon) having an average diameter of 20 /iin and a refractive index of 1.49 were added to the binder resin in an amount of 150 parts by weight based on the amount of the binder resin, and then monodispersed in a single layer using a milling machine, after which the dispersion thus obtained was applied on one surface of a super-transparent PET film FHSS (available from Kolon) 188 ⁇ m thick as a substrate layer using a gravure coater, and then cured at 120 ° C for 60 sec, thus forming a light diffusion layer (refractive index: 1.49) having a dry thickness of 25 ⁇ m.
  • a mixture of a photosensitive resin composition and isobutane particles in an amount of 5 parts by weight based on 100 parts by weight of the photosensitive resin composition was applied, the photosensitive resin composition being composed of 60 parts by weight of urethane acrylate, 20 parts by weight of 2-phenylethyl methacrylate, 10 parts by weight of benzylmethacrylate, 5 parts by weight of isobutyl methacrylate, 3 parts by weight of 1, 6-hexanediol acrylate and 2 parts by weight of a BAPO- based photoinitiator .
  • a mixture of a photosensitive resin composition, polymethylmethacrylate particles (MH20F, available from Kolon) in an amount of 5 parts by weight based on 100 parts by weight of the photosensitive resin composition and isobutane particles in an amount of 5 parts by weight based on 100 parts by weight of the photosensitive resin composition was applied, the photosensitive resin composition being composed of 60 parts by weight of urethane acrylate, 20 parts by weight of 2-phenylethyl methacrylate, 10 parts by weight of benzylmethacrylate, 5 parts by weight of isobutyl methacrylate, 3 parts by weight of 1, 6-hexanediol acrylate and 2 parts by weight of a BAPO- based photoinitiator.
  • the upper surface of the frame of a prism-shaped roller was coated with the photosensitive resin composition applied on the substrate layer, after which UV light (300 watts/inch 2 , available from Fusion) was radiated onto the outer surface of the substrate layer, thus forming a light-collecting layer having a linear array of triangular prisms and including isobutane particles having an average diameter of 15 ⁇ m foamed using curing heat
  • a multifunctional optical sheet was manufactured in the same manner as in Example 1, with the exception that the isobutane particles were contained in the air layer in an amount of 70 parts by weight" based on 100 parts by weight of the binder resin.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 1, with the exception that the isobutane particles were contained in the air layer in an amount of 100 parts by weight based on 100 parts by weight of the binder resin.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 2, with the exception that the isobutane particles were used in an amount of 10 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 2, with the exception that the isobutane particles were used in an amount of 15 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • Example 8> A multifunctional optical sheet was manufactured in the same manner as in Example 3, with the exception that the isobutane particles were used in an amount of 7 parts by weight based on 100 parts by weight of the photosensitive resin composition. ⁇ Example 9>
  • a multifunctional optical sheet was manufactured in the same manner as in Example 3, with the exception that the isobutane particles were used in an amount of 9 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 3, with the exception that the polymethylmethacrylate particles (MH20F, available from Kolon) were used in an amount of 3 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • the polymethylmethacrylate particles (MH20F, available from Kolon) were used in an amount of 3 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 3, with the exception that the polymethylmethacrylate particles (MH20F, available from Kolon) were used in an amount of 7 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • the polymethylmethacrylate particles (MH20F, available from Kolon) were used in an amount of 7 parts by weight based on 100 parts by weight of the photosensitive resin composition.
  • a multifunctional optical sheet was manufactured in the same manner as in Example 3, with the exception that the isobutane particles were not used. ⁇ Comparative Example 3>
  • a prism film (LC213, available from Kolon) was layered on one surface of a light diffusion film (LD602, available from Kolon) .
  • the properties of the multifunctional optical sheets of the above examples and comparative examples were evaluated as follows. The evaluation results are shown in Table 1 below.
  • a backlight unit for a 32" LCD panel was preheated for 2 hours or more, a diffusion plate was mounted thereon, and then the multifunctional optical sheet of each of the examples and Comparative Examples 1 and 2 or the light diffusion film and the prism film of Comparative Example 3 was layered thereon, after which luminance thereof was measured.
  • the luminance was measured in a manner such that a sheet for measuring luminance was mounted on the diffusion plate, the luminance thereof was measured, the sheet for measuring luminance was removed, and then the backlight unit was waited for stabilization in a state of being turned-on until the difference between the luminance in a state in which only the diffusion plate was provided before another sheet for measuring luminance was mounted and the luminance in a state in which only the diffusion plate was provided before the sheet of each of the examples and comparative examples was layered was less than 0.05%.
  • the measurement of luminance using a luminance meter (model number: BM-7, available from Topcon, Japan) was repeated 3 times at 9 points according to VESA standard, and the luminance values at the center point were averaged and then evaluated according to the following:
  • a backlight unit was turned-on and preheated for 2 hours, and then the luminance thereof was measured using a
  • BM-7 available from Topcon. All of the sheets other than the reflection sheet and the diffusion plate were removed from the backlight unit (32"), and the optical member of the examples and comparative examples was mounted, after which luminance values were measured at an interval of 1 mm in every direction from the brightest point, and the difference between the maximum luminance and the minimum luminance was divided by the maximum luminance and then the resulting value was converted into a percentage, called a
  • Waver fraction (%) This value indicates the lamp hiding performance of the optical member of the examples and comparative examples. As the Waber fraction was higher, hiding performance was evaluated to be low.
  • the multifunctional optical sheets including the foamed beads in the examples according to the present invention could be seen to have luminance or hiding luminance superior to those of the comparative examples without foamed beads, and to exhibit luminance and hiding performance equivalent to those of the conventional case in which the prism film and the light diffusion film were used together.
  • the multifunctional optical sheet according to the present invention can minimize the loss of light and can increase the use efficiency of the light source, thus improving luminance and hiding performance. Even when the light diffusion film and the prism film as in the conventional case are not separately used, the multifunctional optical sheet according to the present invention can exhibit luminance equivalent to or higher than that of the conventional case, thus preventing problems due to the use of a plurality of films.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention porte sur une feuille optique multifonctionnelle destinée à être utilisée dans des dispositifs d'affichage à cristaux liquides. Ladite feuille optique multifonctionnelle peut présenter une performance d'obturation appropriée tout en réalisant une luminance équivalente à celle d'un boîtier classique dans lequel une feuille de prisme est stratifiée sur un élément de diffusion de lumière, réduisant ainsi le nombre de feuilles devant être montées dans une unité de rétro-éclairage.
PCT/KR2008/007063 2007-11-30 2008-11-28 Feuille optique multifonctionnelle WO2009069977A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/745,383 US20110026124A1 (en) 2007-11-30 2008-11-28 Multi-functional optic film
CN2008801186320A CN101883995A (zh) 2007-11-30 2008-11-28 多功能光学片

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2007-0123898 2007-11-30
KR20070123898 2007-11-30
KR1020080119663A KR20090056903A (ko) 2007-11-30 2008-11-28 광학용 복합 시트
KR10-2008-0119663 2008-11-28

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WO2009069977A2 true WO2009069977A2 (fr) 2009-06-04
WO2009069977A3 WO2009069977A3 (fr) 2009-09-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011130950A1 (fr) * 2010-04-23 2011-10-27 上海凯鑫森产业投资控股有限公司 Feuille micro-moulée pour module de rétro-éclairage

Citations (2)

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US10378729B2 (en) 2010-04-23 2019-08-13 Shanghai Ccs Industrial Investment Holding Co., Ltd. Micro-molded sheet for backlight module

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