WO2006031043A1 - Feuille de reflexion et unite de retroeclairage faisant appel a cette feuille - Google Patents

Feuille de reflexion et unite de retroeclairage faisant appel a cette feuille Download PDF

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Publication number
WO2006031043A1
WO2006031043A1 PCT/KR2005/003007 KR2005003007W WO2006031043A1 WO 2006031043 A1 WO2006031043 A1 WO 2006031043A1 KR 2005003007 W KR2005003007 W KR 2005003007W WO 2006031043 A1 WO2006031043 A1 WO 2006031043A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflection sheet
sheet
bead
coating layer
reflection
Prior art date
Application number
PCT/KR2005/003007
Other languages
English (en)
Inventor
Jong-Sun Yoon
Min-Seok Seo
Jin-Uk Heo
Original Assignee
Skc Co., Ltd.
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
Priority claimed from KR1020050084416A external-priority patent/KR100719482B1/ko
Application filed by Skc Co., Ltd. filed Critical Skc Co., Ltd.
Priority to US11/662,671 priority Critical patent/US7850356B2/en
Priority to JP2007531080A priority patent/JP2008512719A/ja
Publication of WO2006031043A1 publication Critical patent/WO2006031043A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector

Definitions

  • the present invention relates to a reflection sheet for protecting a light guide panel and a backlight unit employing the same.
  • an edgelight-type backlight unit 100 includes a rod-shaped cold cathode fluorescent lamp (CCFL) 101 which is used as a light source and extends along a side of a rectangular- shaped light guide panel 104, an optical sheet 106 including a plurality of layers stacked on a front surface of the light guide panel 104, and a reflection sheet 102 disposed on a rear surface of the light guide panel 104.
  • CCFL cold cathode fluorescent lamp
  • Each layer of the optical sheet 106 has a specific optical property such as refraction, diffusivity, and so forth.
  • the optical sheet 106 includes a light diffusion sheet 108 disposed on a front surface of the light guide panel 104, a prism sheet 110 disposed on a front surface of the light diffusion sheet 108, and so forth.
  • the backlight unit 100 provides the following functions. First, light beams incident into the light guide panel 104 from the fluorescent lamp 101 are first reflected on reflection dots (not shown in the Figure) of the rear surface of the light guide panel 104 and on each of the side faces, and exit from the front surface of the light guide panel 104 . That is, the light guide panel 104 serves as a surface light source. The light beams exited from the light guide panel 104 enter into the light diffusion sheet 108 , then diffuse and exit from the front surface of the light diffusion sheet 108 .
  • the light beams exited from the light diffusion sheet 108 enter into a prism sheet 110 , and exit as light beams having a distribution representing a peak in a direction along a sub ⁇ stantially normal line through a prism part 110-1 formed on the front surface of the prism sheet 110 . Accordingly, the light beams exited from the fluorescent lamp 101 is diffused by the light diffusion sheet 108 , while being refracted by the prism sheet 110 so that it represents a peak in a direction along the substantially normal line, and illuminate the entire face of the upper liquid crystal layer although not shown in the Figure.
  • the reflection sheet 102 is disposed on the rear surface of the light guide panel 104.
  • the reflection sheet 102 is usually composed of a white opaque polyester film or a laminated film where a surface or both surfaces of a white opaque polyester film are coated with a hard coating layer containing a large quantity of an organic or inorganic filler for the purpose of increasing reflectivity.
  • Such a reflection sheet 102 is responsible for efficiently reflecting light beams directed toward the underlying structure to the front surface of the light guide panel 104 and to the overlying light diffusion sheet 108, to thereby increase brightness of an LCD and for preventing the underlying structure disposed below the backlight unit 100 from being viewed from the front side of an LCD.
  • the reflection sheet 102 must have a uniform surface with respect to the entire surface of the light guide panel 104 so that light beams are uniformly reflected in all directions. Disclosure of Invention
  • an acrylic resin-based light guide panel commonly used as the light guide panel 104 has a relatively high surface hardness, and thus hardly experiences a surface damage by an interfacial friction generated upon a contact between a light guide panel and a reflection sheet during backlight unit assembling or by an external impact.
  • most commonly known light guide panels have a smooth and flat surface and the underlying printed layer of a light guide panel also has a smooth and flat surface, and thus the surface characteristics of a reflection sheet are not likely to be an issue.
  • the prism-patterned light guide panel is a light guide panel in which a three-dimensional triangular prism pattern is formed on a panel surface by injection molding or laser processing.
  • the prism pattern has a sharp upper end.
  • the prism pattern may be destroyed by a friction or an external impact. For this reason, a poor appearance or a reduction in brightness by optical loss may be caused.
  • Korean Patent Laid-Open Publication No. 2004-0039222 discloses an acrylic light guide panel for use in a backlight unit for a plastic LCD, which is formed by mixing or a chemical reaction of a plastic rubber or a material having a high degree of flexibility with an acrylics resin.
  • the acrylic light guide panel also undergoes the same problems as in the use of the prism-pattemed light guide panel due to its low surface hardness.
  • Korean Patent Laid-Open Publication No. 2003-0025192 discloses a reflection sheet including a damage preventive layer containing a polyurethane bead or a silicon rubber bead on a base sheet.
  • the polyurethane bead has substantially insufficient flexibility and thus cannot sufficiently prevent damage to a light guide panel.
  • the silicon rubber bead is flexible but unreacted monomers or oligomers diffused out from a surface of the silicon rubber bead may cause a bright unevenness.
  • the present invention provides a reflection sheet capable of sufficiently protecting a surface of a light guide panel, simultaneously with preventing an optical degradation such as bright unevenness .
  • the present invention also provides a backlight unit for a liquid crystal display employing the reflection sheet and thus providing better and uniform brightness.
  • a reflection sheet for a backlight unit including: a base sheet; and a flexible coating layer, formed on at least a surface of the base sheet, containing at least one flexible elastomeric bead selected from the group consisting of an elastomeric acrylic bead, an elastomeric nylon bead, and a microcapsule resin bead having a core charged with an air or an organic material.
  • the reflection sheet may further include a metal reflection layer and a transparent resin layer that are sequentially stacked between the base sheet and the flexible coating layer.
  • a backlight unit for a liquid crystal display including:
  • a light guide panel located beside the light source for transmitting the light beams and having a side surface into which the light beams are incident from the light source, a lower surface, and an upper surface from which the light beams are exited;
  • an optical sheet disposed on the upper surface of the light guide panel, uniformly diffusing the light beams exited from the light guide panel and refracting the diffused light beams in a substantially perpendicular direction to an upper surface of the optical sheet;
  • a reflection sheet disposed on the lower surface of the light guide panel, reflecting the light beams from the light source toward the light guide panel,
  • the reflection sheet including :
  • a flexible coating layer formed on at least a surface of the base sheet, containing at least one flexible elastomeric bead selected from the group consisting of an elastomeric acrylic bead, an elastomeric nylon bead, and a microcapsule resin bead having a core charged with an air or an organic material.
  • a liquid crystal display including the reflection sheet according to the present invention.
  • a reflection sheet according to the present invention includes a flexible coating layer containing a particularly selected elastomeric flexible elastomeric bead and thus having excellent resistance to impact and friction. Therefore, the reflection sheet can sufficiently protect a surface of a light guide panel without causing an optical degradation such as reduction in brightness, bright unevenness, and so forth. Furthermore, the reflection sheet of the present invention may further include a metal reflection layer. According to this embodiment, better brightness characteristics are ensured.
  • the reflection sheet according to the present invention includes a flexible coating layer, and thus, exhibits excellent resistance to friction and impact.
  • a metal reflection layer is further included in the reflection sheet, the reflection sheet is excellent in specular reflectivity and brightness as well as in resistance to friction and impact. Therefore, the reflection sheet of the present invention can be usefully applied to a light guide panel of a backlight unit having a weak surface hardness or requiring a surface protection due to a surface prism pattern.
  • damage to a light guide panel can be effectively prevented, thereby preventing reduction in brightness and bright unevenness due to damage to a light guide panel.
  • the brightness of the backlight unit can also be enhanced.
  • FIG. 1 is a schematic perspective view illustrating a conventional edgelight-type backlight unit
  • FIG. 2 is a schematic sectional view illustrating a reflection sheet according to an embodiment of the present invention.
  • FIG. 3 is a schematic sectional view illustrating a reflection sheet according to another embodiment of the present invention.
  • FIG. 4 is a schematic sectional view illustrating a reflection sheet according to still another embodiment of the present invention.
  • FIG. 5 is a schematic sectional view illustrating a reflection sheet according to yet another embodiment of the present invention.
  • FIG. 2 is a schematic sectional view illustrating a reflection sheet 10 for a backlight unit according to an embodiment of the present invention.
  • the reflection sheet 10 includes a base sheet 2 made of a white opaque resin; and a flexible coating layer 4, formed on the base sheet 2, containing at least one flexible elastomeric bead 6 having a rubbery elasticity selected from the group consisting of an elastomeric acrylic bead, an elastomeric nylon bead, and a microcapsule resin bead having a core charged with an air or an organic material.
  • the reflection sheet 10 of this embodiment is adopted to a backlight unit, a light guide panel is contacted to only protrusions of the flexible coating layer 4 formed by the flexible elastomeric bead 6. Therefore, a surface damage to the light guide panel can be remarkably reduced. Furthermore, a frictional damage caused by winding or overlapping during storage or transport of the reflection sheet 10 can be minimized.
  • the base sheet 2 made of the white opaque resin imparts basic reflectivity and masking capability to the reflection sheet 10.
  • the 'white opaque resin' of the base sheet 2 indicates a resin having a white color by use of a white pigment or through the dispersion of microbubbles.
  • the resin for use in the base sheet 2 include, but are not limited to, polyester resins including polyethyleneterephthalate (PET), polybutyleneterephthalate (PBT) and polyethylenenaphthalate (PNT), acrylic resins, polycarbonate resins, polystyrene, polyolefines, cellulose acetate, and polyvinylchloride. PET with good heat resistance is preferable.
  • the thickness of the base sheet 2 may range from 100 to 300 ⁇ m , but the present invention is not limited thereto . If the thickness of the base sheet 2 is less than 100 ⁇ m , the brightness of a backlight unit and thus a liquid crystal display using it may be decreased due to a poor reflectivity of the base sheet 2. On the other hand, if it exceeds 300 ⁇ m ,curling may occur during its fabrication processes or storage . Furthermore, the thickness of a backlight unit increases, which makes it difficult to fabricate a thin liquid crystal display.
  • Examples of the white pigment include, but are not limited to, titanium oxide, silicon oxide, zinc oxide, lead carbonate, barium sulfate, calcium carbonate, and aluminum oxide. Titanium oxide with high masking capability is preferable.
  • the white pigment may have an average particle size of 0.1 to 50 ⁇ m , and more preferably 0.1 to 5 ⁇ m . If the average particle size of the white pigment is less than 0.1 ⁇ m , the reflectivity and masking capability of the reflection sheet 10 may be in ⁇ sufficient. On the other hand, if it exceeds 50 ⁇ m , the reflectivity and masking capability of the reflection sheet 10 may become non-uniform.
  • the content, average particle size, and so forth, of the bubbles that can be dispersed in the base sheet 2 can be appropriately adjusted so that the reflectivity and masking capability of the reflection sheet 10 are of a similar level to those in a conventional reflection sheet.
  • the flexible coating layer 4 includes a binder 8 and the flexible elastomeric bead 6.
  • the flexible elastomeric bead 6 is dispersed in the binder 8.
  • the reflection sheet 10 has a plurality of protrusions due to the presence of the flexible elastomeric bead 6.
  • the rear surface of the light guide panel is not contacted to the entire front surface of the reflection sheet 10 but is contacted to only the plurality of the protrusions of the reflection sheet 10. Therefore, sticking between the reflection sheet 10 and a light guide panel and a brightness unevenness of a liquid crystal display panel are prevented.
  • the thickness of the flexible coating layer 4 (the thickness of the binder layer 8 without the flexible elastomeric bead 6) is not particularly limited, but may range from 1 to 50 ⁇ m , preferably 1 to 20 ⁇ m .
  • the flexible elastomeric bead 6 is at least one flexible elastomeric bead selected from the group consisting of an elastomeric acrylic bead, an elastomeric nylon bead, and a microcapsule resin bead having a core charged with an air or an organic material.
  • the flexible elastomeric bead 6 reduces the surface hardness of the protrusions of the flexible coating layer 4, thereby preventing a surface damage to a light guide panel.
  • the flexible elastomeric bead 6 used herein has an elastic recovery of 30 to 90%, preferably 50 to 70%, through adjustment in degrees of crosslinking, crys- tallinity, and/or molecular weight.
  • the elastic recovery of the flexible elastomeric bead 6 is less than 30%, rubbery elasticity may not be substantially accomplished so that the surface hardness of the protrusions of the flexible coating layer 4 becomes hard, thereby may cause a surface damage to a light guide panel.
  • it exceeds 90% it may be difficult to manufacture a microscale flexible elastomeric bead.
  • the elastomeric acrylic bead is a flexible elastomeric bead having a rubbery elasticity made of a homopolymer or copolymer of alkyl acrylate ester and/or alkyl methacrylate ester with (meth)acrylonitrile, (meth)acrylamide, methyl (meth)acrylate, and/or N-methylol (meth)acrylamide.
  • the physical properties of the homopolymer or copolymer resin are significantly affected by the type of a side chain alkyl group.
  • the homopolymer or copolymer made from an alkyl acrylate ester monomer tends to have a low glass transition temperature and imparts good elasticity and flexibility
  • the homopolymer or copolymer made from an alkyl methacrylate ester monomer tends to exhibit a high glass transition temperature and hard characteristics (i.e., poor elasticity and flexibility).
  • the elastomeric acrylic bead used herein is made of a homopolymer or copolymer made from an alkyl acrylate ester monomer with good elastic recovery.
  • the alkyl group is an alkyl group of Cl ⁇ ClO, preferably an alkyl group of Cl ⁇ C6, and more preferably an alkyl group of Cl ⁇ C4.
  • the elastomeric nylon bead is a flexible elastomeric bead made of a nylon resin such as nylon 6, nylon 66, nylon 7, nylon 46, nylon 11, or nylon 12.
  • the flexibility and elastic recovery of the nylon bead are mainly affected by a degree of crystallinity.
  • the nylon bead can have the above-described degree of elastic recovery by ap ⁇ musculartely adjusting the degree of crystallinity.
  • nylon 11 and nylon 12 provide a higher elastic recovery than nylon 6 and nylon 66.
  • the microcapsule resin bead having the core charged with air or an organic material is not particularly limited provided that it has the above-described degree of elastic recovery.
  • the microcapsule resin bead may be an elastomeric hollow bead in which the core of the bead made of a homopolymer or copolymer made from of alkyl acrylate ester monomer, alkyl methacrylate ester monomer, and/or (meth)acrylonitrile monomer is charged with air or an organic material.
  • the organic material may be a liquid or solid.
  • an organic material having a lower hardness than the shell portion of the hollow bead is preferable due to its contribution to high elastic recovery.
  • the organic material may be alkyl acrylate ester, alkyl methacrylate ester, a low boiling point hydrocarbon, or a polymer thereof.
  • the alkyl group may be an alkyl group of Cl ⁇ ClO, preferably an alkyl group of Cl ⁇ C6, and more preferably an alkyl group of Cl ⁇ C4.
  • the low boiling point hydrocarbon may be a hydrocarbon of C3 ⁇ C15. Preferred are butane, pentane, hexane, heptane, octane, nonane, decane, and so forth.
  • the shape of the flexible elastomeric bead 6 used herein is not particularly limited provided that the flexible coating layer 4 have relatively smooth surface protrusions and thus can prevent damage to a light guide panel.
  • the flexible elastomeric bead 6 may be in a spherical, spheroid, spindle, or fibrous form.
  • a spherical flexible elastomeric bead is particularly preferable due to its excellent damage prevention capability.
  • the flexible elastomeric bead 6 may have a mono- dispersed or poly-dispersed particle distribution, and an average particle size of 1 to 100 ⁇ m , more preferably , 3 to 20 ⁇ m .
  • the flexible elastomeric bead 6 may be completely buried in the flexible coating layer 4 due to an excessively small particle size even when it has rubbery elasticity, and thus may not appropriately functions. On the other hand , if it exceeds 100 ⁇ m , coating may be difficult, and the flexible elastomeric bead 6 may be detached from a binder resin due to weak adhesion .
  • the content of the flexible elastomeric bead 6 may range from 0.1 to 50 wt%, more preferably 0.5 to 30 wt%, and still more preferably 1 to 5 wt% based on the total weight of the flexible coating layer 4. If the content of the flexible elastomeric bead 6 is less than 0.1 wt%, a bead distribution per unit area may decrease, and thus a sufficient effect may not be obtained.
  • the amount of the binder 8 relative to that of flexible elastomeric bead 6 is insufficient, and thus detachment of the flexible elastomeric bead 6 may occur or adhesion of the flexible elastomeric bead 6 to the base sheet 2 may be insufficient.
  • the binder 8 is formed by coating a suitable resin composition and covers the flexible elastomeric bead 6 and let them adhere onto the entire front surface of the base sheet 2.
  • the binder 8 may further include at least one selected from an inorganic filler, a curing agent, a plasticizer, a dispersant, a leveling agent, an antistatic agent, a UV absorbent, an antioxidant, a viscosity modifier, a lubricant, and a light stabilizer.
  • the binder 8 has a pencil hardness of 4B ⁇ 2H, preferably 2B ⁇ H, and more preferably HB.
  • a pencil hardness of 4B ⁇ 2H preferably 2B ⁇ H, and more preferably HB.
  • Examples of a resin used in the formation of the binder 8 include, but are not limited to, an acrylic resin, a polyester resin, a polyether polyol resin, a polyester polyol resin, a polyurethane resin, a silicon-based resin, a fluorine -based resin, a polyamideimide resin, an epoxy resin, and a UV curable resin. These resins can be used alone or in combination of two or more.
  • the resin used in the formation of the binder 8 may be a transparent resin that does not affect the reflectivity and masking capability of the base sheet 2. A colorless transparent resin is particularly preferable.
  • the resin used in the formation of the binder 8 may have a number average molecular weight of 1,000 to 500,000, and more preferably 5,000 to 100,000.
  • the acrylic resin for use in the binder 8 may be a homopolymer of alkyl acrylate ester monomer or alkyl methacrylate ester monomer, such as polymethylacrylate, poly ⁇ methylmethacrylate, polyethylacrylate, and polyethylmethacrylate, or a copolymer of those monomers with acrylonitrile, acrylamide, and/or N-methylolacrylamide.
  • a polyisocyanate compound can be contained as a curing agent in a resin composition.
  • a cured product is a polyurethane resin.
  • the use of the polyisocyanate compound increases the curing speed of a resin composition.
  • a cationic antistatic agent for increasing the dispersion stability of an inorganic filler is contained in a resin composition, reduction in the curing speed by the cationic antistatic agent can be sufficiently compensated, thereby further increasing productivity.
  • the polyisocyanate compound may be a toluene diisocyanate derivative, a xylene diisocyanate derivative or an aliphatic diisocyanate derivative.
  • a xylene diisocyanate derivative alone or a mixture of the xylene diisocyanate derivative with an aliphatic di ⁇ isocyanate derivative is particularly preferable.
  • the xylene diisocyanate derivative is an aromatic diisocyanate derivative providing a higher reaction speed of a resin composition and experiencing a yellowing and a degradation by heat or UV light at a relatively low level. Thus, a decrease in the transmittance of the reflection sheet 10 over a long period of time can be reduced.
  • the aliphatic diisocyanate derivative exhibits a lower capability in enhancing reaction speed but a remarkably low level of yellowing, degradation, and so forth, due to exposure to heat and/or UV rays, and so forth., than the aromatic diisocyanate derivative.
  • the combination of the aliphatic diisocyanate derivative with the xylene diisocyanate derivative can achieve balance of an increase in reaction speed and a decrease of yellowing, degradation, and so forth.
  • the aliphatic diisocyanate derivative may be an isophorone diisocyanate derivative or a hexamethylene diisocyanate derivative.
  • the isophorone diisocyanate derivative and the hexamethylene diisocyanate derivative are capable of providing a relatively high curing speed and increasing productivity and heat resistance.
  • the polyisocyanate compound may be used in an amount of 2 to 20 wt%, preferably 5 to 15 wt%, based on the weight of a resin in a resin composition for forming the binder 8.
  • an enhancement in curing speed of a resin composition can be ef ⁇ ficiently accomplished.
  • the resin composition for forming the binder 8 may further include an inorganic filler.
  • the inorganic filler dispersed in the binder 8 can increase the heat resistance of the flexible coating layer 4, and thus the heat resistance of the reflection sheet 10. Accordingly, when the reflection sheet 10 is adopted to a backlight unit, deformation of the reflection sheet 10 due to exposure to the heat emitted from a light source or moisture in air can be remarkably reduced.
  • the inorganic filler may be, in particular, an inorganic oxide filler, but the present invention is not limited thereto.
  • the inorganic oxide may be various oxygen-containing metal compounds forming a three-dimensional network through a bonding of a metal element mainly with an oxygen atom.
  • the metal element constituting the inorganic oxide may be an element selected from Group II- VI of the periodic table, and more preferably, an element selected from Group III- V of the periodic table.
  • An element selected from Si, Al, Ti and Zr is particularly preferable.
  • Colloidal silica is the most preferable as the inorganic filler.
  • the shape of the inorganic filler is not particularly limited and may be in any form, e.g., in a spherical, needle, plate, scale, or irregular form.
  • the inorganic filler may have an average particle size of 0.1 ⁇ 10 ⁇ m , more preferably 0.1 - 5 ⁇ m . If the average particle size of the inorganic filler is less than 0.1 ⁇ m , agglomeration is likely to occur due to a high surface energy of the inorganic filler. On the other hand, if it exceeds 10 ⁇ m , a white cloudy flexible coating layer 4 may be formed, which may adversely affect the reflectivity and masking capability of the reflection sheet 10.
  • the inorganic filler may be used in an amount of 1 to 500 wt%, more preferably, 1 to 200 wt%, and most preferably 1 to 50 wt%, based on the weight of the resin in the resin composition for forming the binder 8. If the amount of the inorganic filler is less than 1 wt%, the heat resistance of the reflection sheet 10 may not be sufficiently obtained. On the other hand, if it exceeds 500 wt%, formulation of components con ⁇ stituting the resin composition becomes difficult and the damage preventive property of the flexible coating layer 4 may be lowered. Meanwhile, the inorganic filler may be an inorganic filler in which an organic polymer is fixed to a surface thereof or is contained in the inorganic filler particles.
  • the resin composition for forming the binder 8 may include an antistatic agent.
  • the antistatic agent examples include, but are not limited to, an anionic antistatic agent such as an alkyl sulfate salt compound and an alkyl phosphate salt compound; a cationic antistatic agent such as a quaternary ammonium salt compound, an im ⁇ idazoline compound, and a betaine derivative; a nonionic antistatic agent such as poly ethylenegly cols, polyoxyethylene sorbitan monostearate ester, and ethanolamides; and a polymer antistatic agent such as polyacrylic acid.
  • a cationic antistatic agent having a relatively high antistatic effect and causing no adverse effect on dispersion stability of the inorganic filler particles.
  • a quaternary ammonium salt compound and a betaine derivative capable of further increasing the antistatic property of the hydrophobic binder 8 are particularly preferable.
  • the antistatic agent may be used in an amount of 0.1 to 10 wt%, preferably 0.5 to 5 wt% based on the weight of the resin in the resin composition for forming the binder 8. If the content of the antistatic agent is less than 0.1 wt%, an antistatic effect may be in ⁇ sufficient. On the other hand, if it exceeds 10 wt%, the strength of the flexible coating layer 4 may be lowered.
  • a method of manufacturing the reflection sheet 10 of this embodiment will now be described.
  • a resin constituting the binder 8 and the flexible elastomeric beads 6 are added to a solvent and shaken vigorously to the extent that the elastomeric beads 6 are finely dispersed to a primary particle size.
  • the above-described optional additives are further added to thereby obtain a resin composition for forming the flexible coating layer 4.
  • the resin composition is coated on a surface of the white opaque base sheet 2 by any one of known coating methods and dried to form the flexible coating layer 4. This completes the fabrication of the reflection sheet 10 of this embodiment.
  • FIG. 3 is a schematic sectional view illustrating a reflection sheet 20 according to another embodiment of the present invention.
  • the reflection sheet 20 further includes a masking coating layer 12 disposed on a rear surface of the base sheet 2, in addition to the component layers constituting the reflection sheet 10 according to the embodiment shown in FIG. 2.
  • the base sheet 2 and the flexible coating layer 4 in the reflection sheet 20 according to the embodiment shown in FIG. 3 are the same as those shown in FIG. 2, and thus, are represented by the same reference numerals as those shown in FIG. 2 and a detailed description thereof will be omitted.
  • the masking coating layer 12 disposed on the rear surface of the base sheet 2 contains a white pigment and serves to further enhance the reflectivity and masking capability of the reflection sheet 20.
  • the white pigment may have an average particle size of 0.1 to 50 ⁇ m , and the content of the white pigment may range from 10 to 90 wt% based on the total weight of the masking coating layer 12. If the content of the white pigment is less than 10 wt%, an enhancement effect in reflectivity and masking capability may be insignificant. On the other hand, if it exceeds 90 wt%, formulation and coating of a resin composition for forming the masking coating layer 12 may be difficult.
  • a resin constituting the binder 8 and the flexible elastomeric beads 6 are added to a solvent and shaken vigorously to the extent that the elastomeric beads 6 are finely dispersed to a primary particle size. Then, when needed, the above-described optional additives are further added to thereby obtain a resin composition for forming the flexible coating layer 4. Then, the resin composition is coated on a surface of the white opaque base sheet 2 by any one of known coating methods and dried to form the flexible coating layer 4. And then, a resin composition for forming the masking coating layer 12 is coated on an opposite surface of the base sheet 2 to the flexible coating layer 4 by any one of known coating methods and dried to form the masking coating layer 12. This completes the fabrication of the reflection sheet 20 according to the embodiment shown in FIG. 3. Meanwhile, in fabrication of the reflection sheet 20 according to the embodiment shown in FIG. 3, the masking coating layer 12 may also be formed prior to forming the flexible coating layer 4.
  • a resin, a white pigment, and other optional additives for use in the resin composition for forming the masking coating layer 12 are not particularly limited.
  • the white pigment may be the same as the white pigment contained in the base sheet 2.
  • the coating amount (when dried) of the resin composition for forming the masking coating layer 12 may range from 1 to 50g/ D , preferably from 5 to 45g/ D , and more preferably from 10 to 4Og/ D . If the coating amount of the resin composition is less than Ig/ D , an enhancement effect in reflectivity and masking capability may be in ⁇ significant. On the other hand, if it exceeds 50g/ D , the thickness of the masking coating layer 22 may be excessively increased, resulting in thick backlight unit, and the strength of the masking coating layer 12 may be lowered.
  • the reflection sheet 20 according to the embodiment shown in FIG. 3 exhibits reflectivity and masking capability by the base sheet 2 and more efficiently prevents damage and sticking to a light guide panel by the flexible coating layer 4.
  • the masking coating layer 12 disposed on the rear surface of the base sheet 2 can further enhance re ⁇ flectivity and masking capability.
  • FIG. 4 is a schematic sectional view illustrating a reflection sheet 30 according to still another embodiment of the present invention .
  • the reflection sheet 30 further includes a metal reflection layer 14 and a transparent resin layer 16 which are sequentially stacked between the base sheet 2 and the flexible coating layer 4, in addition to the component layers constituting the reflection sheet 10 according to the embodiment shown in FIG. 2.
  • the base sheet 2 and the flexible coating layer 4 in the reflection sheet 30 according to the embodiment shown in FIG. 4 are the same as those shown in FIG. 2, and thus, are represented by the same reference numerals as those shown in FIG. 2 and a detailed description thereof will be omitted.
  • the base sheet 2 is not always formed by an opaque sheet materials but may be formed by a transparent sheet.
  • the metal reflection layer 14 has a high reflectivity of light beams, and thus the reflection sheet 30 including the metal reflection layer 14 can exhibit much better re ⁇ flectivity compared to one having no the metal reflection layer 14. Thus, when the reflection sheet 30 according to this embodiment is adopted to a backlight unit, the brightness of light exited from a light guide panel can be further enhanced.
  • the metal reflection layer 14 may be made of any metal having light reflectivity. Examples of the metal include, but are not limited to, copper, silver, aluminum, tin, gold, brass, bronze, and stainless steel. Among them, silver (Ag) is preferable because it does not absorb light and has a high specular reflectivity.
  • the metal reflection layer 14 may be formed by any one of known metal layer forming methods such as vacuum deposition, sputtering, and so on.
  • the thickness of the metal reflection layer 14 is not limited but may range from 50 to 2000 A , preferably from 100 to 1500 A, and more preferably from 500 to 1000 A . If the thickness of the metal reflection layer 14 is less than 50 A , a reflectivity en ⁇ hancement effect may be insignificant, and furthermore, it is difficult to form such a thin film because too much voids are generated. On the other hand, if it exceeds 2000 A , the cost of manufacturing increases because of slow rate of vacuum deposition or sputtering processes and no further increase in reflectivity can be expected.
  • a material for transparent resin layer 16 is not particularly limited provided that the transparent resin layer 16 can be formed as a transparent film.
  • the transparent resin layer 16 may be made of polyester, polycarbonate, polyolefin, and so forth.
  • the thickness of the transparent resin layer 16 is not particularly limited but may range from 0.1 to 100 ⁇ m . If the thickness of the transparent resin layer 16 is less than 0.1 ⁇ m , its function of protecting the metal reflection layer 14 may not be insufficient. On the other hand, if it exceeds 100 ⁇ m , the specular reflectivity of the metal reflection layer 14 deteriorate.
  • an anti-oxidation layer (not shown) for protecting the metal reflection layer 14 may be formed between the base sheet 2 and the metal reflection layer 14.
  • the anti-oxidation layer protects the metal reflection layer 14 from oxidation, moisture in air, contamination due to a contact with impurities, and so forth and is made of an inorganic material such as Si, Ti, or oxides thereof or of an organic polymer resin that may contain additives such as an antioxidant, a UV absorbent, and so forth.
  • a composite film having the metal reflection layer 14 deposited on a surface of the transparent resin layer 16 is prepared.
  • high energy in the form of a high energy radiation and/or heat is applied to a metal target in a high vacuum chamber of about 10 torr or less, and the metal is evaporated to produce metal vapors.
  • the metal vapors are made to be deposited on a surface of the transparent resin layer 16 made of polyester, polycarbonate, polyolefin, and so forth to thereby form the composite film having the metal reflection layer 14 deposited on a surface of the transparent resin layer 16.
  • the anti-oxidation layer for protecting the metal reflection layer 14 may be formed by deposting an inorganic material or by coating an organic polymer resin onto the metal reflection layer 14.
  • On a surface of the opaque or transparent base sheet 2 is laminated the composite film in such a manner that the metal reflection layer 14 of the composite film abuts against the base sheet 2.
  • an adhesive having resistance to a yellowing that may be caused by light or heat.
  • the adhesive may be an acrylic adhesive, an acrylic modified urethane -based adhesive, and so forth.
  • FIG. 5 is a schematic sectional view illustrating a reflection sheet 40 according to yet another embodiment of the present invention.
  • the reflection sheet 40 further includes the masking coating layer 12 disposed on the rear surface of the base sheet 2, in addition to the component layers constituting the reflection sheet 30 shown in FIG. 4.
  • the base sheet 2 and the flexible coating layer 4 in the reflection sheet 40 according to the embodiment shown in FIG. 5 are the same as those shown in FIG. 2, and thus, are represented by the same reference numerals as those shown in FIG. 2 and a detailed description thereof will be omitted.
  • the base sheet 2 is not always formed by an opaque sheet materials but may be formed by a transparent sheet.
  • the reflection sheet 40 according to this embodiment can be manufactured by forming the reflection sheet 30 shown in FIG. 4 according to the method of manu ⁇ facturing the reflection sheet 30 and forming the masking coating layer 12 on the rear surface of the base sheet 2 according to the above-described method.
  • the masking coating layer 12 can be formed prior to forming the flexible coating layer 4.
  • the reflection sheets 10 and 20 according to the present invention exhibit re ⁇ flectivity and masking capability by the base sheet 2.
  • the reflection sheets 10 and 20 include the flexible coating layer 4 with excellent resistance to impact and friction using a particularly selected flexible elastomeric bead having rubbery elasticity, and thus can efficiently prevent damage such as scratch and sticking to a light guide panel.
  • the reflection sheets 30 and 40 further including the metal reflection layer 14 exhibit much better light reflectivity than the reflection sheets 10 and 20 not having the metal reflection layer 14.
  • the reflection sheet 20 and 40 further including the masking coating layer 12 disposed on the rear surface of the base sheet 2 have better reflectivity and masking capability than the reflection sheets 10 and 30 not having the masking coating layer 12.
  • any one of the reflection sheets 10, 20, 30, and 40 according to the present invention is disposed on a rear surface of a light guide panel (see 104 of FIG. 1) in a backlight unit, as described above, damage to the light guide panel can be prevented. Therefore, bright unevenness of a LCD panel by damage of the rear surface of the light guide panel can be prevented and it is easy to assemble a backlight unit.
  • the use of the reflection sheet 30 or 40 further including the metal reflection layer 14 with high reflectivity can further enhance the brightness of a backlight unit.
  • the masking coating layer 12 can prevent a structure such as a frame disposed on a rear surface of the reflection sheet 20 or 40 from appearing on a screen, thereby preventing bright unevenness .
  • Comparative Examples was cut to A4 paper size, and the resistance to friction of a flexible coating layer of each reflection sheet sample was evaluated as follows. That is, a reflection sheet sample was disposed on a polyolefin-based light guide panel so that a flexible coating layer of the reflection sheet sample was contacted to the light guide panel. Then, the reflection sheet sample was pulled using a self-made antifriction test machine at a linear velocity of 3m/min under a load of 20gf/cm . The degree of scratching caused on a prism-patterned surface of the light guide panel was observed with the naked eye and evaluated as follows.
  • a reflection sheet was disposed on a prism-patterned light guide panel so that a flexible coating layer of the reflection sheet was contacted to a triangular prism-patterned surface of the light guide panel. Then, hitting was performed 10,000 times on an upper surface of the reflection sheet using a self-made push tester equipped with a circular lip with a diameter of 2 mm under with a load of lOgf/cm , and occurrence of white spots on the light guide panel was observed by an optical microscope. Impact resistance was evaluated as follows based on the white spots caused by pattern destruction.
  • a surface of a flexible coating layer of a reflection sheet sample was cross-hatched with a razor to form 100 square cells (0.2cm (width) x 0.2cm (length)).
  • a polyester adhesive tape NO31B-35 (NITTO DENKO Corp., Japan) was attached to the surface of the flexible coating layer with the square cells and then quickly detached by hand. At this time, adhesion was evaluated as follows.
  • Opacity is an index of masking capability of a reflection sheet sample.
  • the opacity of a reflection sheet sample was evaluated in transmission mode using an optical den ⁇ sitometer (Model: TR1224, Macbeth).
  • a reflection sheet, a light guide panel, an optical diffusion sheet, and two prism sheets were sequentially stacked to form a backlight unit for 14-inch LCD. Then, the reflection sheet of the backlight unit was replaced with each reflection sheet sample manufactured in the following Examples and Comparative Examples. Brightness of a center portion of the backlight unit was measured using a luminance colorimeter (BM7, Topcon). The rate of brightness variation of each backlight unit was measured and expressed with the brightness measured with a white opaque polyester film (E60L, Toray) as a reflection surface defined as T. For example, if the value of the rate of brightness variation is 1.05, it denotes that the brightness is increased by 5% relative to that of the reference value of T.
  • BM7 luminance colorimeter
  • E60L white opaque polyester film
  • the resin composition was coated on a white opaque PET base sheet (E60L, Toray) with a thickness of about 188 ⁇ m using a table coater and dried to thereby complete a reflection sheet including a flexible coating layer with a dry thickness of about 8 ⁇ m .
  • the reflection sheet was cut to A4 paper size to be used as a reflection sheet sample.
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 7 ⁇ m was manufactured in the same manner as in Example 1 except that 2 parts by weight of an elastomeric nylon bead made of nylon 12 (manufactured by Ganz Chemical Co., Ltd. GPA-700) having an average particle size of about 7 ⁇ m and an elastic recovery of about 66% was used instead of the elastomeric acrylic bead.
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 6 D was manufactured in the same manner as in Example 1 except that 2 parts by weight of a hollow flexible microcapsule resin bead (made of a composition comprised of 96 wt% of crosslinked polymethyl acrylate and 4 wt% of silicon dioxide, manufactured by Matsumoto Yuji Co., Ltd. , SlOO) having an average particle size of about 5 ⁇ m and an elastic recovery of about 59% was used instead of the rubbery acrylic bead.
  • a hollow flexible microcapsule resin bead made of a composition comprised of 96 wt% of crosslinked polymethyl acrylate and 4 wt% of silicon dioxide, manufactured by Matsumoto Yuji Co., Ltd. , SlOO
  • the resin composition was coated on a rear surface of a white opaque PET base sheet (E60L, Toray) with a thickness of about 188 ⁇ m using a table coater and dried to thereby form a masking coating layer with a dry thickness of about 25 ⁇ m .
  • a flexible coating layer with a dry thickness of about 8 ⁇ m was formed on an opposite surface of the PET base sheet to the masking coating layer according to the method described in Example 1.
  • the resultant structure was cut to A4 paper size to be used as a reflection sheet sample.
  • a composite film (Kyoto Nakai Shoji Co., Ltd. , Kirara Flex #25) composed of a silver (Ag) reflection layer with a thickness of about 35A and a transparent PET film with a thickness of about 25 ⁇ m was laminated on a white opaque PET base sheet (E60L, Toray) with a thickness of about 188 ⁇ m so that the silver (Ag) reflection layer was contacted to the PET base sheet.
  • an acrylic resin adhesive manufactured by Aekyung Chemical Co., Ltd., AUP 310) was coated on the PET base sheet prior to the lamination.
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 7 ⁇ m was manufactured in the same manner as in Example 5 except that 2 parts by weight of an elastomeric nylon 12 bead (manufactured by Ganz Chemical Co., Ltd., GPA-700) having an average particle size of about 7 ⁇ m and an elastic recovery of about 66% was used instead of the elastomeric acrylic bead.
  • GPA-700 elastomeric nylon 12 bead having an average particle size of about 7 ⁇ m and an elastic recovery of about 66%
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 6 ⁇ m was manufactured in the same manner as in Example 5 except that 2 parts by weight of a hollow flexible microcapsule resin bead (made of a composition comprised of 96 wt% of crosslinked polymethyl acrylate and 4 wt% of silicon dioxide, manufactured by Matsumoto Yuji Co., Ltd. , SlOO) having an average particle size of about 5 ⁇ m and an elastic recovery of about 59% was used instead of the elastomeric acrylic bead.
  • a hollow flexible microcapsule resin bead made of a composition comprised of 96 wt% of crosslinked polymethyl acrylate and 4 wt% of silicon dioxide, manufactured by Matsumoto Yuji Co., Ltd. , SlOO
  • Example 2 Using the uncoated white opaque PET base sheet (E60L, Toray) of Example 1 as a reflection sheet, the resistance to friction, impact resistance and so forth were evaluated. [123] Comparative Example 2
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 8 ⁇ m was manufactured in the same manner as in Example 1 except that 2 parts by weight of a hard acrylic bead (manufactured by SEKISUI Chemical Co., Ltd., MS 10X- 8D) having an average particle size of about 8 ⁇ m and an elastic recovery of about 9% was used instead of the elastomeric acrylic bead(ACX-806).
  • An A4-sized reflection sheet sample including a flexible coating layer with a dry thickness of about 8 ⁇ m was manufactured in the same manner as in Example 1 except that 55 parts by weight of the elastomeric acrylic bead (ACX-806) was used.
  • Example 5 except that no flexible coating layer was used.
  • a composite film Korean Organic Chemical Co., Ltd. , Kirara Flex #25
  • a silver (Ag) reflection layer with a thickness of about 35 A
  • a transparent PET film with a thickness of about 25 ⁇ m
  • an acrylic resin adhesive manufactured by Aekyung Chemical Co., Ltd., AUP 310 was coated on the PET base sheet prior to the lamination.
  • the thus-formed reflection sheet was cut to A4 size to be used as a reflection sheet sample.
  • the reflection sheet samples of Examples 1-7 according to the present invention exhibited better resistance to friction and impact than those of Comparative Examples 1-3 and 5 wherein no flexible coating layer was used .
  • the reflection sheet samples of Examples 5-7, in which the silver reflection layer was used were excellent in specular reflectivity and brightness as well as in resistance to friction and impact.
  • the reflection sheet sample of Example 4, in which the masking coating layer was used, exhibited significantly enhanced masking capability due to good opacity.

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

Abstract

L'invention concerne une feuille de réflexion destinée à une unité de rétroéclairage et comprenant une feuille de base et une couche de revêtement souple formée sur au moins une surface de la feuille de base et contenant au moins un élastomère souple choisi dans le groupe constitué par une bille acrylique élastomère, une bille de nylon élastomère et une bille de résine microcapsulaire comprenant un noyau chargé d'air ou d'une matière organique, ainsi qu'une unité de rétroéclairage destinée à un afficheur à cristaux liquides et faisant appel à cette feuille de réflexion. La feuille de réflexion peut également comprendre une couche de réflexion métallique. La feuille de réflexion comprenant la couche de revêtement souple présente une excellente résistance au frottement et au choc. La feuille de réflexion comprenant la couche de revêtement souple et la couche de réflexion métallique présente d'excellentes propriétés de réflectivité spéculaire, de brillance et de résistance au frottement et au choc. Par conséquent, la feuille de réflexion peut être appliquée de manière utile sur un panneau de guidage de lumière d'une unité de rétroéclairage présentant une faible dureté superficielle ou requérant une protection de surface du fait de la présence d'un motif prismatique de surface.
PCT/KR2005/003007 2004-09-13 2005-09-12 Feuille de reflexion et unite de retroeclairage faisant appel a cette feuille WO2006031043A1 (fr)

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US11/662,671 US7850356B2 (en) 2004-09-13 2005-09-12 Reflection sheet and backlight unit employing the same
JP2007531080A JP2008512719A (ja) 2004-09-13 2005-09-12 反射シートおよびこれを採用したバックライトユニット

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KR10-2004-0072954 2004-09-13
KR10-2005-0084416 2005-09-10
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EP2034236A1 (fr) * 2006-06-23 2009-03-11 Toray Industries, Inc. Film de reflexion blanc
JP2010121135A (ja) * 2009-12-22 2010-06-03 Nippon Fine Coatings Inc 高反射性塗料組成物及び高反射性塗膜
EP2808602A1 (fr) * 2013-05-27 2014-12-03 LG Display Co., Ltd. Dispositif d'affichage
US8958028B2 (en) 2011-06-17 2015-02-17 Apple Inc. Protective film patterning
US9817160B2 (en) 2010-02-24 2017-11-14 Toray Industries, Inc. White reflective film for edge-lit backlight and backlight using the same
CN113646669A (zh) * 2019-02-08 2021-11-12 艾利丹尼森公司 柔性逆反射片材
CN114779378A (zh) * 2022-06-17 2022-07-22 宁波长阳科技股份有限公司 一种分层涂布型耐刮擦涂布反射膜及其制备方法

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JP5898345B2 (ja) 2013-08-07 2016-04-06 帝人デュポンフィルム株式会社 白色反射フィルム
JP6354207B2 (ja) * 2014-02-28 2018-07-11 大日本印刷株式会社 反射シート、面光源装置、透過型表示装置
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EP2034236A1 (fr) * 2006-06-23 2009-03-11 Toray Industries, Inc. Film de reflexion blanc
EP2034236A4 (fr) * 2006-06-23 2009-12-09 Toray Industries Film de reflexion blanc
EP2447602A1 (fr) * 2006-06-23 2012-05-02 Toray Industries, Inc. Film réfléchissant blanc
JP2010121135A (ja) * 2009-12-22 2010-06-03 Nippon Fine Coatings Inc 高反射性塗料組成物及び高反射性塗膜
US9817160B2 (en) 2010-02-24 2017-11-14 Toray Industries, Inc. White reflective film for edge-lit backlight and backlight using the same
US8958028B2 (en) 2011-06-17 2015-02-17 Apple Inc. Protective film patterning
EP2808602A1 (fr) * 2013-05-27 2014-12-03 LG Display Co., Ltd. Dispositif d'affichage
US9482900B2 (en) 2013-05-27 2016-11-01 Lg Display Co., Ltd. Display device
CN113646669A (zh) * 2019-02-08 2021-11-12 艾利丹尼森公司 柔性逆反射片材
CN113646669B (zh) * 2019-02-08 2023-09-01 艾利丹尼森公司 柔性逆反射片材
CN114779378A (zh) * 2022-06-17 2022-07-22 宁波长阳科技股份有限公司 一种分层涂布型耐刮擦涂布反射膜及其制备方法
CN114779378B (zh) * 2022-06-17 2022-09-09 宁波长阳科技股份有限公司 一种分层涂布型耐刮擦涂布反射膜及其制备方法

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