WO2010126182A1 - Feuille de diffusion de la lumière pour une unité de rétroéclairage lcd - Google Patents

Feuille de diffusion de la lumière pour une unité de rétroéclairage lcd Download PDF

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Publication number
WO2010126182A1
WO2010126182A1 PCT/KR2009/002294 KR2009002294W WO2010126182A1 WO 2010126182 A1 WO2010126182 A1 WO 2010126182A1 KR 2009002294 W KR2009002294 W KR 2009002294W WO 2010126182 A1 WO2010126182 A1 WO 2010126182A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
light diffusion
nonwoven fabric
backlight unit
substrate
Prior art date
Application number
PCT/KR2009/002294
Other languages
English (en)
Korean (ko)
Inventor
김광수
서정태
이문복
정인식
Original Assignee
도레이새한 주식회사
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 도레이새한 주식회사 filed Critical 도레이새한 주식회사
Publication of WO2010126182A1 publication Critical patent/WO2010126182A1/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
    • G02B5/0236—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00798—Producing diffusers
    • 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 a light diffusing sheet for an LCD backlight unit, and more particularly, a light diffusing layer on at least one of a surface and a back surface of a non-woven fabric or a surface of a non-woven fabric, or a laminate of a nonwoven fabric and a transparent film.
  • the present invention relates to a light diffusion sheet for an LCD backlight unit, which provides high shielding characteristics and is capable of luminance compensation by the formed light diffusion layer.
  • the light diffusion sheet for LCD backlight has a linear lamp on one side of the light guide plate, which is used in small size such as car navigation system, mobile phone, PDA, digital camera, portable TV, camcorder, etc.
  • a non-uniform light source from a light guide plate is converted into a uniform light centered on the front of the backlight unit.
  • the linearly visible light is diffused to provide a uniform omnidirectional central distribution. It performs the function of surface light source and converts the center of light distribution to the front direction. From comes the effect of increasing the luminance in the front direction.
  • the conventional techniques as described above do not satisfy the performance of the brightness and shielding function required for high efficiency backlight such as thinning and low power consumption.
  • the present invention has been made to solve the above problems, an object of the present invention by using a non-woven fabric as a substrate or a part of the substrate to replace the conventional light diffusion film that is conventionally applied to form a light diffusion layer on at least one side of the substrate It is an object of the present invention to provide a light diffusing sheet for an LCD backlight unit and a sheet for a backlight unit that maximize shielding and scattering effects of light.
  • the object is a light diffusion sheet for an LCD backlight unit, comprising: a substrate made of a nonwoven fabric as a substrate and a light diffusion layer coated on at least one surface of the substrate with a coating liquid containing a binder resin and spherical transparent particles; A light diffusing sheet sheet for an LCD backlight unit is achieved.
  • the substrate is characterized in that the non-woven fabric and at least one transparent film selected from a transparent polyethylene terephthalate, polycarbonate, polypropylene, polyisulfone and polyimide film is laminated.
  • a transparent polyethylene terephthalate, polycarbonate, polypropylene, polyisulfone and polyimide film is laminated.
  • the base material may have at least one surface of the nonwoven fabric alone in resins such as acrylic, urethane, epoxy, vinyl, polyester, and polyimide resins such as polymethyl methacrylate or methacrylic acid ester copolymers.
  • resins such as acrylic, urethane, epoxy, vinyl, polyester, and polyimide resins such as polymethyl methacrylate or methacrylic acid ester copolymers.
  • a substrate having a planarization coating treatment by mixing two or more kinds thereof and coating the light diffusing layer on a surface of the planarization coating treatment.
  • the nonwoven fabric has an unbonding rate of 0% to 85%, a weight of 10 to 100g / m 2 , and the material of the nonwoven fabric is polypropylene (PP) or polyethylene terephthalate (PET).
  • PP polypropylene
  • PET polyethylene terephthalate
  • the spherical transparent particles of the light diffusion layer is characterized in that the particles are mixed at least one or more of monodisperse particles, polydisperse particles and polydisperse particles.
  • the refractive index of the spherical transparent particles of the light diffusion layer is 1.4 to 1.6
  • the spherical transparent particles is characterized in that the use of two or more particles having a single or different refractive index.
  • it further comprises an antistatic layer on the opposite side of the sheet on which the light diffusion layer is formed.
  • a non-woven fabric itself or a non-woven fabric laminated on a transparent film or a non-woven fabric flattened surface is used, and at least one surface of the substrate is light-diffused coating, thereby slimming the backlight and reducing the number of lamps, LED point light source This can effectively solve the problem of the visual perception caused by the.
  • the light diffusing sheet for an LCD backlight unit relates to a light diffusing sheet used in a backlight unit of an LCD, and more particularly, a thin film transistor liquid crystal display (TFT-LCD) or a super twisted nematic liquid crystal display (STN-LCD).
  • TFT-LCD thin film transistor liquid crystal display
  • STN-LCD super twisted nematic liquid crystal display
  • a light diffusion sheet used for which induces uniform surface light and obtains high brightness and clear light image while passing light from linear light emitted from a cold cathode fluorescent lamp located on the side or the back to obtain a clear image of the display. It relates to a light diffusion sheet that can be.
  • the light diffusing sheet for an LCD backlight unit is characterized in that it comprises a light diffusion layer coated with a substrate and a coating liquid containing a binder resin and spherical transparent particles on at least one surface of the substrate, the substrate is a non-woven fabric itself Or at least one surface of the nonwoven fabric coated with a binder or flattened, or at least one transparent film selected from a nonwoven fabric and a transparent polyethylene terephthalate, polycarbonate, polypropylene, polyisulfone, and polyimide film is laminated. .
  • At least one surface of the nonwoven fabric is coated with a binder to flatten the base material of at least one surface of the nonwoven fabric, such as polymethyl methacrylate or methacrylic acid ester copolymer, such as acrylic, urethane, epoxy, vinyl, polyester, It is a planarized coating by coating alone or in mixture of two or more kinds of resin such as polyimide-based, and then the light diffusion layer is applied to the flattened coated surface.
  • a binder to flatten the base material of at least one surface of the nonwoven fabric, such as polymethyl methacrylate or methacrylic acid ester copolymer, such as acrylic, urethane, epoxy, vinyl, polyester.
  • the light diffusing sheet for an LCD backlight unit according to the present invention is characterized in that the nonwoven fabric is used as a base material or a part of the base material. This is because it is possible to enhance the shielding force and at the same time increase the luminance by forming a light diffusion layer on at least one surface.
  • the nonwoven fabric has basic properties of 50 to 95% haze and 30 to 80% transmittance, and properties of the final light diffusion sheet having a light diffusion layer formed on at least one surface of the nonwoven fabric also have a haze of 50 to 95% and transmittance 30 to 80%.
  • the nonwoven fabric according to the present invention has an unbonding rate of 0% to 85%, preferably 10 to 100 g / m 2 , and the material of the nonwoven fabric is preferably polypropylene (PP) or polyethylene terephthalate (PET). Do.
  • the non-bonding rate of the nonwoven fabric is greater than 85% (less than 15% bonding rate)
  • the formed web may have insufficient form stability and low strength, and thus may not be applied as a cloth, and the nonwoven fabric may have a weight of 10 g / m 2. If it is less than one, there is a disadvantage in that it is not economically produced, such as a decrease in productivity, and if the weight exceeds 100 g / m 2, it is too thick, so that heat transfer is difficult in performing heat calendering to give form stability. This is because there is a problem that becomes difficult.
  • the binder resin used in the light diffusing layer of the light diffusing sheet for LCD backlight unit according to the present invention should be transparent and acrylic, urethane, epoxy, vinyl, polyester, such as polymethyl methacrylate or methacrylic acid ester copolymer. And it can use individually or in mixture of 2 or more types in resin, such as a polyimide system.
  • the transparent particles used as the light diffusing agent are preferably spherical, and as such transparent particles, organic particles such as acrylic particles, styrene particles, silicon particles, and inorganic particles such as synthetic silica, glass beads, and diamond may be used. These light diffusing agents can be used individually or in mixture of 2 or more types.
  • the spherical transparent particles are characterized in that the particles are at least one of a mixture of monodisperse particles, polydisperse particles and polydisperse particles.
  • monodispersion particles, polydispersion particles and polydispersion particles are divided according to the particle size distribution of the particles. For example, when 10 micrometers monodisperse particle
  • grains are divided into monodispersion when the particle content rate of 10 micrometers of average particle diameters is 90% or more, it is divided into polydispersion when it is 80% or more, and polydispersion when it is less than that.
  • the refractive index of the spherical transparent particles is 1.4 to 1.6, it is preferable that the particles are used alone or two or more particles having different refractive index.
  • the refractive index of the spherical transparent particles is out of the range of 1.4 ⁇ 1.6, that is, when the refractive index is less than 1.4 or more than 1.6, it is generally possible to manufacture it by changing to another material (inorganic), not the material of the particles used in the light diffusion film.
  • the refractive index is most preferably in the above range because the light absorbing light is not suitable for use for the optical sheet and there is a problem that the price is increased.
  • various coating methods such as a conventional wet coating method such as a knife coating method, a gravure transfer coating method, a reverse roll coating method, and other deposition methods may be applied.
  • the back surface of the light diffusing layer formed on one surface of the light diffusing sheet according to the present invention is provided with a slip property, and the hardness for suppressing the scratches generated during the cutting and assembly operations It is also possible to form an antistatic layer having an antistatic function for the purpose of preventing the incorporation of foreign matters.
  • the light diffusion sheet manufactured according to the present invention has improved light shielding performance than the conventional light diffusion sheet when mounted in the backlight unit.
  • the light diffusing layer was formed with the same coating solution, and the shielding force according to the substrate using the nonwoven fabric and the general transparent film (PET) substrate was compared. After the planarization coating process using resin, the light-diffusion layer was formed on it, and the sample which formed the light-diffusion layer on one surface was compared and evaluated based on what laminated
  • paper calendaring means heat pressing on one side of a nonwoven fabric as is well known to those skilled in the art.
  • a coating solution 1 having the following composition was applied to a non-woven fabric of 85% of a paper calendaring-treated non-bonding ratio and a weight of 30 g / m 2 by using microgravure to form a light diffusion layer.
  • Binder (acrylic urethane, A-811): 18% by weight
  • Particle 1 (10 ⁇ m medium dispersion, MH-10FD): 20 wt%
  • Particle 2 (5 ⁇ m polydispersity, MH-5FD): 9 wt%
  • Curing agent (isocyanate): 2% by weight
  • Curing agent (isocyanate): 8% by weight
  • the same coating liquid 1 as in Example 1 was applied onto the PET film by laminating with an acrylic adhesive using microgravure.
  • Example 2 The same coating solution 1 as in Example 1 was applied to one surface of the transparent PET film (XU42) using microgravure.
  • the luminance was compared by measuring the front luminance value on the backlight assembly using Topcon's BM-7A measuring instrument (Sample Structure: Sample // Prism).
  • the shielding force was quantified by defining the front brightness of the backlight assembly at equal intervals 100 points by using Topcon's BM-7A measuring device as shown in Equation 1 below.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une feuille de diffusion de la lumière pour une unité de rétroéclairage LCD, et plus spécifiquement une feuille de diffusion de la lumière comprenant un tissu non tissé, un tissu non tissé doté d'une surface aplatie ou un tissu non tissé stratifié doté d'un film transparent, qui est utilisé en tant que substrat pour former une couche de diffusion de lumière sur la surface avant ou arrière de la feuille de diffusion de lumière, en permettant ainsi d'obtenir un important effet de protection contre la lumière et une compensation de la luminance. Le substrat pour la feuille de diffusion de lumière destinée à des rétroéclairages LCD, selon la présente invention, comprend un tissu non tissé et une couche de diffusion de lumière appliqués en revêtement sur au moins une surface du substrat à l'aide d'un liquide de revêtement comprenant une résine de liant et des particules sphériques transparentes, de sorte que ledit substrat soit stratifié de préférence sur un film de polyéthylènetéréphtalate transparent. En outre, le tissu non tissé seul, ou un tissu non tissé optique moulé ou traité, est utilisé en tant que substrat, ou en tant que partie du substrat, de la feuille de diffusion de lumière destinée à une unité de rétroéclairage.
PCT/KR2009/002294 2009-04-29 2009-04-30 Feuille de diffusion de la lumière pour une unité de rétroéclairage lcd WO2010126182A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20090037582 2009-04-29
KR10-2009-0037582 2009-04-29

Publications (1)

Publication Number Publication Date
WO2010126182A1 true WO2010126182A1 (fr) 2010-11-04

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WO (1) WO2010126182A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107664782A (zh) * 2016-07-27 2018-02-06 京东方科技集团股份有限公司 扩散元件及其制作方法、背光模组和显示装置
US11338543B2 (en) * 2017-09-01 2022-05-24 Benecke-Kaliko Ag Light-permeable multi-layer composite film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08320406A (ja) * 1995-05-26 1996-12-03 Nitto Denko Corp 光拡散板
JPH095504A (ja) * 1995-06-19 1997-01-10 Nitto Denko Corp 光拡散板
KR20070055650A (ko) * 2005-11-26 2007-05-31 도레이새한 주식회사 박막트랜지스터 액정디스플레이 백라이트 유닛용 광확산필름

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08320406A (ja) * 1995-05-26 1996-12-03 Nitto Denko Corp 光拡散板
JPH095504A (ja) * 1995-06-19 1997-01-10 Nitto Denko Corp 光拡散板
KR20070055650A (ko) * 2005-11-26 2007-05-31 도레이새한 주식회사 박막트랜지스터 액정디스플레이 백라이트 유닛용 광확산필름

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107664782A (zh) * 2016-07-27 2018-02-06 京东方科技集团股份有限公司 扩散元件及其制作方法、背光模组和显示装置
EP3495855A4 (fr) * 2016-07-27 2020-08-19 Boe Technology Group Co. Ltd. Élément de diffusion et son procédé de fabrication, module de rétroéclairage et dispositif d'affichage
US11338543B2 (en) * 2017-09-01 2022-05-24 Benecke-Kaliko Ag Light-permeable multi-layer composite film

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