WO2010126183A1 - Feuille composite pour unité de rétroéclairage lcd - Google Patents

Feuille composite pour unité de rétroéclairage lcd Download PDF

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Publication number
WO2010126183A1
WO2010126183A1 PCT/KR2009/002295 KR2009002295W WO2010126183A1 WO 2010126183 A1 WO2010126183 A1 WO 2010126183A1 KR 2009002295 W KR2009002295 W KR 2009002295W WO 2010126183 A1 WO2010126183 A1 WO 2010126183A1
Authority
WO
WIPO (PCT)
Prior art keywords
composite sheet
backlight unit
lcd backlight
nonwoven fabric
dimensional structure
Prior art date
Application number
PCT/KR2009/002295
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 WO2010126183A1 publication Critical patent/WO2010126183A1/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
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape

Definitions

  • the present invention relates to a composite sheet for an LCD backlight unit, and more particularly, by forming a prism layer on at least one of the surface and the back surface based on a nonwoven fabric or a nonwoven fabric surface planarization treatment or a laminate of a nonwoven fabric and a transparent film.
  • the present invention relates to a composite sheet for an LCD backlight unit, which is capable of imparting and also capable of luminance compensation by the formed prism layer.
  • the prism sheet or composite sheet for LCD backlight is linear 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.
  • the EDGE type backlight unit characterized in that the lamp is installed, and the SIDE type backlight unit in which one or more lamps are installed and used, converting the uneven light source from the light guide plate into uniform light centered on the front direction of the backlight unit. It acts as a surface light source for linearly visible light even when a large number of cold cathode fluorescent lamps or flat lamps are installed in the direct type, that is, the back of the backlight. Brings the effect of increasing the brightness of the direction.
  • the conventional techniques as described above do not satisfy the function of effectively shielding the point or line light source shape required in a high-efficiency backlight such as thinning and low power consumption.
  • the object of the present invention is to replace the general prism or composite sheet using a nonwoven fabric as a substrate or a part of the substrate and to form a prism layer on at least one surface of the substrate to refracted light And to provide a composite sheet for an LCD backlight unit to maximize the scattering effect to improve the shielding characteristics required in the backlight and the slimmer backlight consisting of a linear lamp and a point light source.
  • a composite sheet for an LCD backlight unit comprising a substrate made of a nonwoven fabric as a substrate and a prism layer on at least one surface of the substrate.
  • 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.
  • 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 prism layer has a column-shaped three-dimensional structure of semi-circular or semi-elliptic cross-section or a column-shaped three-dimensional structure of triangular or polygonal cross-section, or a plurality of three-dimensional structures selected from cones and polyhedral pyramids. It is characterized by a structure.
  • the three-dimensional structure is characterized in that at least two types of three-dimensional structure having the same width and different height are repeated regularly or irregularly.
  • the three-dimensional structure is characterized in that at least two types of three-dimensional structure having the same height and different widths are regularly or irregularly repeated.
  • the three-dimensional structure is characterized in that the non-linear arrangement with respect to the plane.
  • it further comprises an antistatic layer on the opposite side of the sheet on which the prism layer is formed.
  • the binder resin used for the prism layer is transparent, and among acrylic, urethane, epoxy, vinyl, polyester and polyimide resins such as polymethyl methacrylate or methacrylic acid ester copolymers. It is characterized by mixing individual or two or more.
  • the binder resin has a refractive index of 1.4 to 1.7, and the binder resin is characterized by including two or more kinds of binder resins having a single or different refractive index.
  • the nonwoven fabric as a substrate or a part of the substrate, it is effective to effectively solve the problem of visibility caused by the use of a point light source (LED), slimming the backlight, and reducing the number of lamps.
  • the prism layer formed on one surface can achieve the effect of compensating the luminance.
  • the composite sheet for an LCD backlight unit relates to a composite sheet used in the backlight unit of the LCD, the linear or point light irradiated from the cold cathode fluorescent lamp or LED light source located on the side or back to obtain a clear image of the display
  • the present invention relates to a composite sheet capable of inducing uniform surface light while passing light from and obtaining high brightness and clear optical images.
  • the composite sheet for an LCD backlight unit according to the present invention is characterized in that it comprises a substrate and a prism layer on at least one surface of the substrate.
  • the substrate may be made of only nonwoven fabric, or may be planarized by coating a binder on at least one surface of the nonwoven fabric or at least one transparent film selected from a nonwoven fabric and a transparent polyethylene terephthalate, polycarbonate, polypropylene, polyisulfone, and polyimide film. It is characterized by.
  • 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 resins such as polyimide-based, and then the prism layer is formed on 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 prism layer may be various prism sheets in the related art related to the backlight unit, and a detailed description thereof will be omitted and may be applied to any one formed on at least one surface of the substrate.
  • the composite 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, which improves the shielding effect by effectively scattering and refracting the nonwoven fabric formed from several layers to several tens of layers of light.
  • the nonwoven fabric is used as a base material or a part of the base material, which improves the shielding effect by effectively scattering and refracting the nonwoven fabric formed from several layers to several tens of layers of light.
  • a prism layer on at least one surface, it is possible to enhance the shielding force and increase the brightness at the same time.
  • the nonwoven fabric has basic properties of 50 to 95% haze and 30 to 90% transmittance.
  • the nonwoven fabric has an unbonding rate of 0% to 85%, preferably 10 to 100 g / m 2 , and the nonwoven fabric is preferably polypropylene (PP) or polyethylene terephthalate (PET). If 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.
  • PP polypropylene
  • PET polyethylene terephthalate
  • the binder resin used in the prism layer of the composite sheet for an LCD backlight unit according to the present invention should be transparent, and acrylic, urethane, epoxy, vinyl, poly, such as polymethyl methacrylate or methacrylic acid ester copolymer. It can be used individually or in mixture of 2 or more types in resin, such as ester type and a polyimide type.
  • the refractive index of the binder resin is 1.4 to 1.7, it is preferable that the binder resin is used alone or two or more having different refractive index.
  • the back surface of the prism layer formed on one surface of the composite sheet for LCD backlight unit according to the present invention is provided with slip property, and the scratches generated during cutting and assembly work are suppressed. It is also possible to form an antistatic layer having an antistatic function for the purpose of increasing the hardness for preventing foreign matter from being mixed.
  • the composite sheet manufactured according to the present invention has better shielding performance than the conventional composite sheet or prism sheet when mounted in the backlight unit.
  • the prism layer of the composite backlight unit for an LCD backlight unit according to the present invention is a column-like three-dimensional structure of the semi-circular or semi-elliptic cross-section, or a column-like three-dimensional structure of the triangular or polygonal cross-section or cone and polyhedron pyramid
  • a plurality of three-dimensional structure selected from among the features is characterized in that the surface is structured.
  • the three-dimensional structure has the same width and at least two types of three-dimensional structures having different heights are regularly or irregularly repeated, or the three-dimensional structure has the same height and at least two three-dimensional structures having different widths are regularly or irregularly. It may be repeated, it is preferable that the three-dimensional structure is a linear or non-linear arrangement with respect to the plane.
  • the prism layer of the composite sheet prepared according to the following example was coated with a composition containing 96 parts by weight of a high refractive acrylate (Guardia 4110, Kumho) and 4 parts by weight of a photoinitiator (Iraqure 184), and irradiated with ultraviolet rays to a width of 50 ⁇ m and a height of 25 A linear triangular prism of ⁇ m was formed equally along the substrate to compare the shielding force along the substrate.
  • the nonwoven fabric used for each Example used the nonwoven fabric of 30 g / m ⁇ 2> of weight of 85% of the unbonded paper calendaring process.
  • paper calendaring means heat pressing on one side of the nonwoven fabric as is well known to those skilled in the art.
  • Example 1 was made into the composite sheet for LCD backlight units which used only the nonwoven fabric as a base material, and formed the prism layer directly on one surface.
  • Example 2 was a composite sheet for an LCD backlight unit in which one surface of a nonwoven fabric was coated with a coating liquid having the composition of the following coating liquid 1 as a substrate, and then a prism layer was formed thereon.
  • Binder resin (acrylic urethane, A-811): 70% by weight
  • Curing agent (isocyanate): 8% by weight
  • Example 3 is an LCD backlight unit in which a prism layer is formed on one surface of a nonwoven fabric and a transparent PET film (XG7HU7) used for manufacturing an optical film having a haze of about 1% and a transmittance of about 92% based on an acrylic adhesive. It was set as the composite sheet for.
  • XG7HU7 transparent PET film
  • the comparative example was made into the composite sheet for LCD backlight unit in which the microlens was formed in one surface of PET film (XG7HU7).
  • the shielding force was quantified by defining the front luminance on the backlight assembly by measuring 100 points at equal intervals using Topcon's BM-7A measuring device as shown in Equation 1 below.
  • Equation 1 is a formula created to quantify the shielding force, and is a method of evaluating how uniformly the overall brightness is obtained by comparing the brightness deviation between the dark part and the wrist by measuring the brightness at a close interval. It indicates that the luminance deviation is small, indicating that the shielding power is excellent.
  • the optical composite sheet As described above, it is possible to maximize the light diffusion effect by using the nonwoven fabric as a substrate or a part of the substrate to greatly improve the shielding performance, and also by forming a prism layer on one surface thereof, the luminance compensation is appropriately achieved and the backlight In addition, the number of sheets used in the optical sheet assembly for the reduction of cost can be expected.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une feuille composite pour une unité de rétroéclairage LCD, et plus spécifiquement une feuille composite contenant un tissu non tissé, un tissu non tissé doté d'une surface aplatie, ou un tissu non tissé stratifié doté d'un film transparent 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. Par conséquent, au moins une surface du substrat de la feuille composite pour l'unité de rétroéclairage LCD selon la présente invention comprend une couche de prisme, de sorte que ledit substrat soit stratifié de préférence sur le tissu non tissé à l'aide d'au moins un film transparent sélectionné parmi du polyéthylènetéréphtalate, du polycarbonate, du polypropylène, du polyéthersulfone ou du polyimide. De préférence, ledit substrat est formé en aplatissant et en recouvrant au moins une surface dudit tissu non tissé avec un type de résine ou un mélange d'au moins deux types de résines sélectionnés parmi des types uréthanne, époxy, polyester, polyamide et des types acryliques, tels que du polyméthylméthacrylate ou un copolymère d'ester méthacrylique, et ladite couche de prisme est formée sur la surface aplatie et recouverte.
PCT/KR2009/002295 2009-04-29 2009-04-30 Feuille composite pour unité de rétroéclairage lcd WO2010126183A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20090037583 2009-04-29
KR10-2009-0037583 2009-04-29

Publications (1)

Publication Number Publication Date
WO2010126183A1 true WO2010126183A1 (fr) 2010-11-04

Family

ID=43032315

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2009/002295 WO2010126183A1 (fr) 2009-04-29 2009-04-30 Feuille composite pour unité de rétroéclairage lcd

Country Status (1)

Country Link
WO (1) WO2010126183A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11338543B2 (en) * 2017-09-01 2022-05-24 Benecke-Kaliko Ag Light-permeable multi-layer composite film

Citations (4)

* 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
KR20070045509A (ko) * 2005-10-27 2007-05-02 엘지전자 주식회사 복수의 확산시트를 포함하는 백라이트 장치 및 이를 포함하는 액정 표시 소자
KR20070055650A (ko) * 2005-11-26 2007-05-31 도레이새한 주식회사 박막트랜지스터 액정디스플레이 백라이트 유닛용 광확산필름

Patent Citations (4)

* 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
KR20070045509A (ko) * 2005-10-27 2007-05-02 엘지전자 주식회사 복수의 확산시트를 포함하는 백라이트 장치 및 이를 포함하는 액정 표시 소자
KR20070055650A (ko) * 2005-11-26 2007-05-31 도레이새한 주식회사 박막트랜지스터 액정디스플레이 백라이트 유닛용 광확산필름

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11338543B2 (en) * 2017-09-01 2022-05-24 Benecke-Kaliko Ag Light-permeable multi-layer composite film

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