KR100953945B1 - A method for fabricating composite film used in the flat panel display device - Google Patents

A method for fabricating composite film used in the flat panel display device Download PDF

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KR100953945B1
KR100953945B1 KR1020070123609A KR20070123609A KR100953945B1 KR 100953945 B1 KR100953945 B1 KR 100953945B1 KR 1020070123609 A KR1020070123609 A KR 1020070123609A KR 20070123609 A KR20070123609 A KR 20070123609A KR 100953945 B1 KR100953945 B1 KR 100953945B1
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composite film
beads
prism
flat panel
panel display
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KR20090056462A (en
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김재환
강광선
조기연
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인하대학교 산학협력단
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • 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
    • 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
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

본 발명은 평판 디스플레이 장치용 복합필름에 관한 것으로, 고분자로 이루어진 프리즘시트, SiO2로 이루어진 구슬, 및 셀룰로오스로 구성된 복합필름을 제공한다.The present invention relates to a composite film for a flat panel display device, and provides a composite film made of a prism sheet made of a polymer, beads made of SiO 2 , and cellulose.

평판 디스플레이, 복합필름, 셀룰로오스, 광투과율, 광굴절율 Flat Panel Display, Composite Film, Cellulose, Light Transmittance, Light Refractive Index

Description

평판 디스플레이 장치용 복합필름 제조방법{A method for fabricating composite film used in the flat panel display device}A method for fabricating composite film used in the flat panel display device}

본 발명은 평판 디스플레이 장치용 복합필름을 제조하는 방법에 관한 것으로, 특히 셀룰로오스를 이용함으로써 환경문제를 발생시키지 않고 저렴하게 복합필름을 제조하는 방법을 제공한다.The present invention relates to a method for manufacturing a composite film for a flat panel display device, and in particular, to provide a method for manufacturing a composite film at low cost without causing environmental problems by using cellulose.

복합필름이란 종래의 LCD 백라이트유닛(BLU)에서 사용하고 있던 것으로, 두 장의 프리즘시트(Prism sheet)와 확산필름을 하나로 결합한 필름이다. 프리즘시트는 백라이트유닛에서 램프의 빛을 집속시켜 평판 디스플레이의 휘도를 높여주는 역할을 하는 고가의 기능성 필름이다. 이는 또한 LCD 디스플레이의 화질 및 휘도와 직결되는 중요한 부품으로 현재 백라이트유닛 원가의 17% 정도를 차지하고 있다. 확산시트도 프리즘시트와 유사한 백라이트유닛 구성 부품으로서 백라이트유닛에서 방출되는 빛을 도광판(Light guide plate) 상단에서 LCD 전면에 균일하게 전달하는 역할을 해주며 또한 반대 면은 불투명하게 하여 도광판 형태를 숨기는 역할을 한다. 이에 대한 재료는 대부분 가격이 저렴하면서도 광 투과성이 좋은 폴리에틸렌 테레프탈레이트(PET)를 기판으로 사용하고 있다. 광굴절율(refractive index; RI)은 1.575로 일반 고분자보다 매우 높다. 빛은 항상 광굴절율이 높은 방향으로 가기 때문에 프리즘의 재료로는 광굴절율이 PET보다 높은 UV 경화 수지를 사용하고 있다. 그러나, PET의 광굴절률이 이미 너무 높기 때문에 프리즘으로 사용되는 물질에는 많은 한계가 있다. 이런 이유로 인해, 광 굴절율을 높이기 위해 심지어는 인체에 해로운 브롬계 물질을 사용하는 등 현재 많은 연구가 진행되고 있다.The composite film is used in a conventional LCD backlight unit (BLU), and is a film combining two prism sheets and a diffusion film into one. Prism sheet is an expensive functional film that serves to increase the brightness of a flat panel display by focusing the light of the lamp in the backlight unit. It is also an important component directly related to the quality and brightness of LCD displays, which currently account for about 17% of the backlight unit cost. Diffusion sheet is a backlight unit component similar to prism sheet, which uniformly transmits the light emitted from the backlight unit from the top of the light guide plate to the front of the LCD and hides the shape of the light guide plate by making the opposite side opaque. Do it. Most of these materials use polyethylene terephthalate (PET) as a substrate, which is inexpensive and has good light transmission. The refractive index (RI) is 1.575, which is much higher than that of general polymers. Since light always goes in the direction of high refractive index, the material of prism uses UV curable resin with higher refractive index than PET. However, there are many limitations to the material used as the prism because the refractive index of PET is already too high. For this reason, a lot of research is currently being conducted, such as using a bromine-based material that is harmful to the human body to increase the refractive index.

본 발명은 상기한 바와 같은 종래의 문제를 해결코자 하는 것으로, 광투과율이 매우 뛰어나면서도 동시에 낮은 광굴절율을 갖는 재료를 기판으로 사용하는 복합필름을 제조하는 것이다.The present invention is to solve the conventional problems as described above, to produce a composite film using a material having a very high light transmittance and a low light refractive index as a substrate.

본 발명은 그 목적을 이루고자 하는 수단으로 광투과율이 높은 반면에 낮은 광굴절율을 갖는 셀룰로오스를 사용한다. 예로서, 셀룰로오스 아세테이트(CA) 및 셀룰로오스 아세테이트 부티레이트(CAB)는 모두 1.475의 광굴절율을 갖는다. The present invention uses cellulose having high light transmittance but low light refractive index as a means to achieve the object. By way of example, both cellulose acetate (CA) and cellulose acetate butyrate (CAB) have a light refractive index of 1.475.

또한 프리즘 선단에 유리 구슬을 사용하여 광굴절율을 향상시킬 뿐만 아니라 빛을 최대한 여러 각도로 확산시킬 수가 있다.In addition, glass beads can be used at the tip of the prism to improve the refractive index, as well as to diffuse the light at various angles.

본 발명에 따라 이러한 셀룰로오스를 사용함으로써 종래의 광굴절율에 대한 문제를 해결할 수 있고 또한 많은 여러 재료를 프리즘의 제조에 사용할 수 있다. 더욱이, 본 발명에 따라 셀룰로오스와 종래의 UV 경화 수지를 사용하여 광굴절율의 편차를 확대시킴으로써 휘도를 획기적으로 향상시킬 수가 있고, 높은 광굴절율을 갖는 프리즘의 단부에 상대적으로 낮은 광굴절율을 갖는 SiO2 구슬을 넣어줌으로써 빛의 확산효과를 얻을 수가 있다. By using such cellulose in accordance with the present invention, problems with conventional photorefractive index can be solved and many different materials can be used for the production of prisms. Furthermore, according to the present invention, the luminance can be dramatically improved by expanding the variation of the refractive index by using cellulose and the conventional UV curable resin, and SiO 2 having a relatively low refractive index at the end of the prism having a high refractive index. You can get light diffusion effect by adding beads.

특히, 셀룰로오스는 생분해성이 있기 때문에 폐기시에 자연 분해되어 환경오염을 일으키지 않는다.In particular, since cellulose is biodegradable, it is decomposed naturally at the time of disposal and does not cause environmental pollution.

첨부한 도면을 참조로 이하 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1에 나타낸 바와 같이 프리즘 몰드를 가진 컨베이어 벨트에 원하는 크기와 양의 SiO2 구슬을 뿌려준다. 여기에 사용되는 구슬은 스퇴버 합성법으로 만들어지는 바, 일정한 크기의 SiO2 구슬 표면에 MPTMS(mercaptopropylmethoxysilane)과 공유결합시켜 -SH 작용기를 표면에 골고루 분포시킨다. 이렇게 만들어진 구슬을 수용액에 분산시킨 후 금속(예, 은) 이온을 녹여 환원제를 첨가하게 되면 이온의 농도에 따라 여러 크기의 나노 입자가 구슬 표면에 형성되어 빛의 전방향 확산을 극대화할 수 있다. 일반적으로 사용되는 프리즘은 넓이가 약 30 내지 50 미크론이고 깊이가 약 20 미크론이므로 0.5 내지 3 미크론의 구를 뿌려주면 프리즘 몰드의 바닥에 놓이게 된다. 그 위에 노즐을 통해 고분자, 예를 들어, 폴리메틸메타클레이트(PMMA) 또는 폴리에틸렌 테레프탈레이트(PET) 물질을 분사 또는 도포한 후에 경화시키면 삼각형의 틀이 형성됨과 동시에 일정한 양의 SiO2가 삼각형의 정점부위에 증착하게 된다. 연속 공정으로 이렇게 진행된 상태에서 컨베이어 벨트의 전진하는 방향의 다음 위치에서는 미리 제조된 셀룰로오스 필름 재료를 이 위에 노즐을 통해 분사시켜서 상기한 프리즘 시트와 결합함으로써 복합필름을 완성한다. 일반적인 백라이트 유닛에서는 이렇게 만들어진 프리즘시트 위에 확산 시트를 덮지만, 셀룰로오스를 이용한 복합필름에선 이 확산시트를 사용하지 않는 대신에 SiO2를 사용하게 된다. 프리즘 재료와 구슬은 큰 RI 차이를 보이고 있고, 이러한 큰 RI 차이로 인해서 프리즘시트를 통과한 빛이 구슬을 통해서 전방향으로 확산한다. As shown in Fig. 1, a desired size and amount of SiO 2 beads are sprayed onto a conveyor belt having a prism mold. The beads used here are made by the Stover synthesis method, and covalently bonds with mercaptopropylmethoxysilane (MPTMS) on the surface of SiO 2 beads of uniform size to distribute -SH functional groups evenly on the surface. After dispersing the beads in an aqueous solution and then adding a reducing agent by dissolving metal (eg, silver) ions, nanoparticles of various sizes are formed on the surface of the beads according to the concentration of ions, thereby maximizing omnidirectional diffusion of light. Generally used prisms are about 30 to 50 microns wide and about 20 microns deep, so spraying 0.5 to 3 microns will place them on the bottom of the prism mold. Spraying or applying a polymer, for example polymethyl methacrylate (PMMA) or polyethylene terephthalate (PET) material, through a nozzle on it and then curing it forms a triangular frame and at the same time a certain amount of SiO 2 It is deposited on the vertex. At the next position in the advancing direction of the conveyor belt in this state in a continuous process, a prefabricated cellulose film material is sprayed through the nozzle on it and combined with the above prism sheet to complete the composite film. In the general backlight unit, the diffusion sheet is covered on the prism sheet thus made, but in the cellulose-based composite film, SiO 2 is used instead of the diffusion sheet. The prism material and the beads show a large RI difference, and due to this large RI difference, light passing through the prism sheet diffuses through the beads in all directions.

도 1은 본 발명의 실시예에 의해 복합필름을 제조하는 방법을 개략적으로 도시한 예시도, 및1 is an exemplary view schematically showing a method of manufacturing a composite film according to an embodiment of the present invention, and

도 2는 도 1에 따라 제조된 본 발명에 따른 복합필름을 설명한 단면도이다.2 is a cross-sectional view illustrating a composite film according to the present invention manufactured according to FIG. 1.

Claims (6)

다음의 단계로 구성된 평판 디스플레이 장치용 복합필름을 제조하는 방법:Method for manufacturing a composite film for a flat panel display device consisting of the following steps: 프리즘 몰드를 가진 컨베이어 벨트에 원하는 크기의 SiO2 구슬을 뿌리는 단계,Spraying SiO 2 beads of the desired size onto a conveyor belt with a prism mold, 컨베이어 벨트가 전진하는 방향에서 노즐을 통해 프리즘 원료인 고분자 물질을 분사하여 프리즘시트를 형성하는 단계, 및Spraying a polymer material, which is a prism raw material, through a nozzle in a direction in which the conveyor belt is advanced to form a prism sheet; and 컨베이어 벨트의 전진하는 방향의 다음 위치에서 노즐을 통해 셀룰로오스 필름 재료를 분사시켜서 이 셀룰로오스 필름을 상기한 프리즘시트와 결합하는 단계.Combining the cellulose film with the prism sheet described above by spraying a cellulose film material through a nozzle at a position next to the advancing direction of the conveyor belt. 제 1 항에 있어서, SiO2 구슬은 스퇴버(stober) 형성법에 의한 것으로 SiO2 구슬 표면에 금속 나노입자를 결합하여 복합필름을 제조하는 방법.The method of claim 1, wherein the SiO 2 beads are formed by a stober formation method to produce a composite film by bonding metal nanoparticles to a surface of the SiO 2 beads. 제 1 항에 있어서, 프리즘시트의 프리즘 높이를 20 미크론으로 하고 이에 대응하여 구슬의 직경이 0.5 내지 3 미크론이 되도록 한 복합필름을 제조하는 방법.The method according to claim 1, wherein the prism height of the prism sheet is 20 microns, and correspondingly, the diameter of the beads is 0.5 to 3 microns. 삭제delete 제 1 항에 있어서, 셀룰로오스는 셀룰로오스 아세테이트(CA) 및 셀룰로오스 아세테이트 부티레이트(CAB)를 포함하는 복합필름을 제조하는 방법.The method of claim 1, wherein the cellulose comprises cellulose acetate (CA) and cellulose acetate butyrate (CAB). 제 1 항에 따라 제조된 평판 디스플레이 장치용 복합필름.Composite film for a flat panel display device manufactured according to claim 1.
KR1020070123609A 2007-11-30 2007-11-30 A method for fabricating composite film used in the flat panel display device KR100953945B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070015645A (en) * 2005-03-30 2007-02-06 주식회사 코오롱 Prismatic film and manufacturing method thereof
JP2007223313A (en) 2006-02-21 2007-09-06 Cayman Islands Shoako Kagi Kofun Yugenkoshi Method for forming molded thin film molded with tape-like die

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070015645A (en) * 2005-03-30 2007-02-06 주식회사 코오롱 Prismatic film and manufacturing method thereof
JP2007223313A (en) 2006-02-21 2007-09-06 Cayman Islands Shoako Kagi Kofun Yugenkoshi Method for forming molded thin film molded with tape-like die

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