WO2011130948A1 - Plaque de diffusion pour module de rétroéclairage - Google Patents

Plaque de diffusion pour module de rétroéclairage Download PDF

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Publication number
WO2011130948A1
WO2011130948A1 PCT/CN2010/074879 CN2010074879W WO2011130948A1 WO 2011130948 A1 WO2011130948 A1 WO 2011130948A1 CN 2010074879 W CN2010074879 W CN 2010074879W WO 2011130948 A1 WO2011130948 A1 WO 2011130948A1
Authority
WO
WIPO (PCT)
Prior art keywords
backlight module
diffusion
nanoparticles
diffusion sheet
module according
Prior art date
Application number
PCT/CN2010/074879
Other languages
English (en)
Chinese (zh)
Inventor
金长松
金青松
Original Assignee
上海凯鑫森产业投资控股有限公司
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 上海凯鑫森产业投资控股有限公司 filed Critical 上海凯鑫森产业投资控股有限公司
Publication of WO2011130948A1 publication Critical patent/WO2011130948A1/fr

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Classifications

    • 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
    • G02B5/0226—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 having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Definitions

  • the present invention relates to the field of liquid crystal displays, and more particularly to a diffusion sheet for a backlight module. Background technique
  • a backlight module of various structures is provided.
  • the backlight module includes a light source, a light guide plate and a plurality of optical sheets, and the light from the light source passes through the light guide plate and the plurality of optical sheets and then exits to the display.
  • FIG. 1 is a schematic diagram of a conventional backlight module.
  • the backlight module includes: a light source 4; a light guide plate 5 for changing a path of light emitted from the light source 4 to be guided to a display portion (not shown); and a plurality of optical sheets 6, 7, 8 Provided between the light guide plate 5 and the display portion (not shown) for improving the efficiency of emitting light from the light guide plate 5; the reflector 2 is provided to prevent the light generated from the light source 4 from being exposed to the outside
  • the lower portion of the light guide plate 5, the light source reflector 3, and the mold frame 1 are formed by sequentially laminating the reflector 2, the light source reflector 3, the light guide plate 5, and the optical sheets 6, 7, and 8 on the mold frame 1.
  • the optical sheets 6, 7, 8 may be composed of the diffusion sheet 6, the prism sheet 7, and the protective sheet 8, and the diffusion sheet 6 functions to diffuse and diffuse from the light guide plate 5 and enter the display portion (not shown).
  • the light is made to make the brightness distribution of the light uniform.
  • the prism sheet 7 is repeatedly formed on the upper portion to have a sectional shape of The triangular prisms condense the light diffused through the diffusion sheet 6 to a direction perpendicular to the plane of the display portion (not shown) to increase the brightness.
  • the protective sheet 8 is laminated on the upper portion of the prism sheet 7, and the light incident on the prism sheet 7 is diffused while protecting the surface of the prism sheet 7, so that the distribution of light is made uniform.
  • a diffusion sheet coated with fine particles is used, but although these fine particles have a certain diffusion effect, if the concealing effect is increased, the amount of the fine particles in the diffusion sheet and the amount of the diffusion layer are increased.
  • the concealing effect is improved by the increase of the haze, but the coating is difficult, and the loss of brightness is caused by the decrease of the relative transmittance. Therefore, the prior art cannot achieve the effect of concealing the LED lamp arrangement mode and low luminance loss. .
  • Korean Patent No. 10-0938118 which provides an optical sheet module for improving light brightness by improving light utilization efficiency, comprising: a nanowire comprising a transparent film, a grooved nanostructure formed on one side of the transparent film, and formed on a metal layer on the nanostructure; and at least one optical sheet disposed on the polarizer, the nanowire, and the lower portion of the polarizer.
  • This technology is only suitable for polarizers and is achieved by special nano-coating techniques, which are difficult to apply.
  • Japanese Patent No. 7,160,018 discloses a backlight system in which a nanoparticle layer is formed on a fine structure surface of a light guide plate. This patent attempts to improve the brightness of light supplied to a liquid crystal display device by a nanoparticle layer on the surface of the light guide plate. A problem with this prior art is that it is difficult to uniformly apply the nanoparticle layer to the surface of the light guide plate of the hard material, which requires chemical deposition or the like.
  • the present invention provides a diffusion sheet for a backlight module, comprising: a substrate layer composed of a light transmissive material; and a diffusion layer laminated on the upper portion of the substrate layer and containing an adhesive, nanoparticles, and fine particles.
  • the diffusion layer has a thickness of from 1 m to 30 ⁇ m.
  • the microparticles comprise at least one of an acrylic resin, an acrylonitrile resin, a polyurethane, a polyvinyl chloride, a polystyrene, a polyacrylonitrile or a polyimide.
  • the microparticles are composed of polymethyl methacrylate, and the microparticles have a particle size of 5 ⁇ m to 25 ⁇ m.
  • the nanoparticles comprise at least one of silicon dioxide, alumina, titania, zirconia, aluminum hydroxide, barium sulfide or magnesium silicate, and mixtures of the foregoing.
  • the nanoparticles are composed of silicon dioxide, and the nanoparticles have a particle diameter of 10 nm to 100 nm.
  • the content of the fine particles and the nanoparticles of the diffusion layer is 40 to 200 parts by weight of the fine particles and 5 to 50 parts by weight of the nanoparticles with respect to 100 parts by weight of the adhesive.
  • an acrylic resin or a hardening adhesive having excellent optical properties and elasticity is used in a diffusion layer laminated on the upper portion of the substrate layer and containing nanoparticles and fine particles, thereby improving the diffusion layer. Rigid, prevents distortion or curling of the diffuser. Further, according to the content of the nanoparticles in the diffusion layer, it has an excellent diffusion effect, and it is possible to effectively conceal or offset the defects of the light guide plate and the optical sheet while preventing the luminance loss.
  • FIG. 1 is a schematic diagram of a backlight module in the prior art
  • Figure 2 is a transverse cross-sectional view of a diffusion sheet according to an embodiment of the present invention.
  • Fig. 3 is a schematic process view for producing a diffusion sheet of an embodiment of the present invention.
  • Formwork 3 Light source reflector
  • Substrate layer 22a Microparticles
  • Adhesive 40 Winding stick
  • Transfer roller 50 Diffusion coating module 60: Drying module 70: UV curing module
  • FIG. 2 is a transverse cross-sectional view of a diffusion sheet according to an embodiment of the present invention
  • FIG. 3 is an embodiment of manufacturing the present invention.
  • the diffusion sheet 20 of the present invention may include a substrate layer 21 and a diffusion layer 22.
  • the base layer 21 functions to transmit incident light from the lower portion to the upper portion, and is made of a translucent material such as a transparent synthetic resin for efficiently transmitting light.
  • the above transparent synthetic resin includes, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene, polycarbonate, polyester (Polyester) )
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • Polyethylene polyethylene
  • Polycarbonate polyester
  • polyester polyester
  • C0SM0SHINE sold by Japan T0Y0B0 company, LUMILAR of T0RAY company, or the like can be used as the above-mentioned base material layer 21.
  • a polyester fiber-based polymer such as polyethylene terephthalate or polyethylene naphthalate has better transparency and strength.
  • the transparent synthetic resin may be used in combination of one or more kinds, and in order to improve heat resistance and weather resistance, a crosslinking agent, an antioxidant, a light stabilizer, a filler, a reinforcing fiber, a reinforcing agent, and an anti-proof agent may be added.
  • a crosslinking agent an antioxidant, a light stabilizer, a filler, a reinforcing fiber, a reinforcing agent, and an anti-proof agent may be added.
  • Electrostatic agents, flame retardants, plasticizers, anti-deterioration agents and other additives may be added.
  • the thickness of the substrate layer 21 is required to satisfy both the thickness which can be set in the display device and the thickness sufficient to resist bending.
  • the substrate layer 21 has a thickness of about ⁇ ⁇ ⁇ to 250 ⁇ ⁇ .
  • the content is more than the above range, the brightness is lowered, and the problem of the lightness and thinness of the display device cannot be satisfied. If the diffusion layer 22 is laminated on the upper portion of the base material layer, the distortion may occur and the operation may be difficult.
  • the diffusion sheet 20 of the present invention has a refractive index of 0. 05 or less, preferably 0.01 or less, more preferably 0.55 or less in-plane and out-of-plane birefringence, thereby preventing polarization rotation.
  • the diffusion layer 22 of the present invention is laminated on the upper portion of the substrate layer, and contains the adhesive 22c, the nanoparticles 22b and the fine particles 22a dispersed in the adhesive.
  • the thickness of the diffusion layer 22 is not particularly limited, and is preferably ⁇ . The thickness of ⁇ ⁇ to 30 ⁇ ⁇ .
  • the microparticles 22a may be one or more selected from the group consisting of acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile, and polyimide, and it is preferred to use an acrylic resin having high transparency during curing. More preferably, polymethyl methacrylate (PMMA) is used.
  • PMMA polymethyl methacrylate
  • the microparticles 22a have the same size, or any size between each other, and can be variously Arrange.
  • the distance between the microparticles may be different, and may be arranged in contact or in a very close proximity, and the distance between the microparticles is at most about 10 ⁇ m.
  • the microparticles can be laterally offset at an angle to each other. Coating can be made more convenient by the above spacing and angled offset.
  • the size of the microparticles 22a is preferably 5 ⁇ ⁇ to 25 ⁇ . If it exceeds the above range, the concealing effect is enhanced by the increase in haze, but the coating is difficult, and the transmittance is relatively reduced, resulting in loss of brightness. However, if it is less than the above range, the concealing effect is lowered.
  • the content of the above fine particles 22a is preferably 40 to 200 parts by weight based on 100 parts by weight of the adhesive 22c. If it exceeds the above range, the fixation of the fine particles 22a is difficult, and if it is less than the above range, the diffusion effect is lowered.
  • the nanoparticles 22b may use one or more of silica, alumina, titania, zirconia, aluminum hydroxide, barium sulfide or magnesium silicate, or a mixture of the above, and preferably, it is easily used. Nano-level particles, which have low light shielding properties, have good dispersibility, and contribute to heat resistance and rigidity of silica.
  • the shape of the nanoparticles 22b may be any shape such as a spherical shape, a spindle shape, a plate shape, or a fiber shape. However, in order to reduce the shielding property of light, a spherical shape is preferable.
  • the size of the nanoparticles 22b preferably having a particle diameter of 10 nm to 100 nm. When it exceeds the above range, the light shielding property is lowered by the influence of the short wavelength, and the luminance is lowered. If the range is less than the above range, the surface energy of the nanoparticle 22b rises to cause aggregation.
  • the light passing through the diffusion layer 22 is scattered by the above-mentioned fine particles 22a and 22b, thereby effectively concealing or canceling the dark spots which can be observed when the flaws are present in the diffusion sheet 20.
  • the content of the nanoparticles 22b is preferably 5 to 50 parts by weight relative to 100 parts by weight of the adhesive 22c.
  • the content of the nanoparticles 22b is less than 5 parts by weight, the diffusibility and rigidity are not preferable, and if it exceeds 50 parts by weight, the diffusibility and rigidity are improved, but the luminance is lost.
  • the adhesive 22c constituting the diffusion layer 22 may be selected from polycarbonate (Polycarbonate, PC), polyethylene terephthalate (PET), polyacrylate (PAR), urethaneacrylate (UA). , polyetherimide (PEI), polynaphthalene Preferably, at least one of polyethyelenermapthalate (PEN), polyphenylene sulfide (PSS), polyarylate (polyarylate), and polyimide is used, and preferably, Made of a polyacrylate resin or urethane acrylate having excellent elasticity, it contributes to improving the water repellency, the twist resistance, and the uniform dispersibility of the nanoparticles 22b of the adhesive 22c.
  • the above-mentioned adhesive 22c further contains a curing agent such as a polyisocyanate compound, and by including these curing agents, a cationic antistatic agent having an excellent antistatic effect is added even in order to stably disperse the nanoparticles 22b. It can also compensate for the problem of a decrease in the rate of hardening reaction.
  • a curing agent such as a polyisocyanate compound
  • the manufacturing process of the diffusion sheet 20 of the present invention can be performed by a stretching roll 30, a winding roll 40, a plurality of transfer rolls 41, 42, 51, 52, and a diffusion coating comprising the nanoparticles 22b.
  • the module 50, the drying module 60, and the ultraviolet curing module 70 are completed.
  • the stretching roller 30 stretches the substrate layer 21, and the winding roller 40 is wound around the substrate layer 21 which forms the diffusion layer 22.
  • the plurality of transfer rollers 41, 42 are transferred to the substrate layer 21 which is cured by the diffusion layer 22 via the drying module 60 and the ultraviolet curing module 70.
  • the diffusion coating module 50 is provided with an adhesive 22c which mixes the fine particles 22a, the nanoparticles 22b and a volatile solvent, and the solvent includes methanol, ethanol, n-propanol, ISO propanol, n-butanol, and ISO butanol.
  • the alcohol may also include ketones such as methyl ethyl ketone (Methyl Ethyl Keton) and MIBK (Methyl Isobutyl Ketone, MIBK).
  • the adhesive 22c may further include a dispersion stabilizer containing a surfactant such as a cationic system, an anionic system, a nonionic surfactant or a fluorine-based surfactant in order to improve the dispersibility of the fine particles, and preferably includes the adhesive including light.
  • a surfactant such as a cationic system, an anionic system, a nonionic surfactant or a fluorine-based surfactant
  • the method of applying the desired fine particles 22a and the dispersion of the nanoparticles 22b to the diffusion layer 22 is not particularly limited as long as the method of uniform coating can be completed.
  • Various coating methods including a general gravure coating method, a wire drawing method, a spray coating method, a micro gravure coating method, a slit coating method, and the like can be used. Further, a coating method such as a discharge method such as an inkjet method or a screen printing method can be used as needed.
  • the diffusion sheet 20 of the present invention can be manufactured by the above-described manufacturing process, and the diffusion sheet 20 of the present invention thus manufactured can reduce the brightness loss, improve the effect of concealing or offset the flaw exposed to the upper portion of the diffusion sheet, and has an improvement. Its rigidity, ultra-thinness and light weight.

Abstract

L'invention porte sur une plaque de diffusion (20) pour module de rétroéclairage, laquelle plaque comprend une couche de matériau de base (21) réalisée en un matériau de transmission de la lumière, et une couche de diffusion (22) empilée sur la couche de matériau de base. La couche de diffusion comprend un agent adhésif (22c), des nanoparticules (22b) et des microparticules (22a). La plaque de diffusion ayant cette structure peut améliorer la rigidité de la couche de diffusion et empêcher la couche de diffusion de se tordre ou de se courber.
PCT/CN2010/074879 2010-04-23 2010-07-02 Plaque de diffusion pour module de rétroéclairage WO2011130948A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010160656.1 2010-04-23
CN2010101606561A CN101840103B (zh) 2010-04-23 2010-04-23 一种用于背光模块的扩散片

Publications (1)

Publication Number Publication Date
WO2011130948A1 true WO2011130948A1 (fr) 2011-10-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/074879 WO2011130948A1 (fr) 2010-04-23 2010-07-02 Plaque de diffusion pour module de rétroéclairage

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CN (1) CN101840103B (fr)
WO (1) WO2011130948A1 (fr)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
CN101955723A (zh) * 2010-09-30 2011-01-26 宁波激智新材料科技有限公司 应用于雾化膜的组合物、雾化膜及led照明设备
CN103926638A (zh) * 2013-01-10 2014-07-16 捷晟光电材料股份有限公司 光学膜片、屏幕保护贴、与光学膜片的制造方法
CN103293759A (zh) * 2013-06-27 2013-09-11 京东方科技集团股份有限公司 半透半反显示面板及其制备方法、显示装置
CN103400837B (zh) 2013-07-29 2016-09-07 京东方科技集团股份有限公司 一种阵列基板及其制备方法、显示装置
CN103412356B (zh) * 2013-08-30 2016-01-20 浙江元泰特种膜有限公司 一种光学扩散膜及其制备方法
CN106461820B (zh) * 2014-06-10 2020-01-07 木本股份有限公司 光扩散性片及包含该片材的背光装置
CN107839183A (zh) * 2017-11-16 2018-03-27 中山市携特塑料板材有限公司 纳米微结构超长导光板的制备工艺
CN110058337B (zh) * 2019-04-25 2021-04-23 汕头万顺新材集团股份有限公司 一种高清防眩膜

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JP2002258012A (ja) * 2001-02-28 2002-09-11 Keiwa Inc 光拡散シート
US20040071937A1 (en) * 2002-10-15 2004-04-15 Jung-Chen Chien Antiglare film
US20040105052A1 (en) * 2002-03-26 2004-06-03 Masakazu Uekita Light diffusion sheet and backlight unit using the same
US6852396B1 (en) * 1998-09-17 2005-02-08 Keiwa, Inc. Photodiffusion sheet and backlight unit using this
CN1971316A (zh) * 2005-10-14 2007-05-30 吉田实 光扩散片和采用该光扩散片的背照光单元
CN101118337A (zh) * 2006-08-04 2008-02-06 鸿富锦精密工业（深圳）有限公司 光学板及其制备方法,以及采用该光学板的背光模组

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JP5054872B2 (ja) * 2001-02-22 2012-10-24 恵和株式会社 光拡散シート及びこれを用いたバックライトユニット
JP4351456B2 (ja) * 2002-03-26 2009-10-28 恵和株式会社 光拡散シート及びこれを用いたバックライトユニット
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Publication number Priority date Publication date Assignee Title
US6852396B1 (en) * 1998-09-17 2005-02-08 Keiwa, Inc. Photodiffusion sheet and backlight unit using this
JP2002258012A (ja) * 2001-02-28 2002-09-11 Keiwa Inc 光拡散シート
US20040105052A1 (en) * 2002-03-26 2004-06-03 Masakazu Uekita Light diffusion sheet and backlight unit using the same
US20040071937A1 (en) * 2002-10-15 2004-04-15 Jung-Chen Chien Antiglare film
CN1971316A (zh) * 2005-10-14 2007-05-30 吉田实 光扩散片和采用该光扩散片的背照光单元
CN101118337A (zh) * 2006-08-04 2008-02-06 鸿富锦精密工业（深圳）有限公司 光学板及其制备方法,以及采用该光学板的背光模组

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Publication number Publication date
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CN101840103B (zh) 2011-07-13

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