KR100803715B1 - Preparing method of prism-patterned broadband reflective polarizer - Google Patents
Preparing method of prism-patterned broadband reflective polarizer Download PDFInfo
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- KR100803715B1 KR100803715B1 KR1020070007620A KR20070007620A KR100803715B1 KR 100803715 B1 KR100803715 B1 KR 100803715B1 KR 1020070007620 A KR1020070007620 A KR 1020070007620A KR 20070007620 A KR20070007620 A KR 20070007620A KR 100803715 B1 KR100803715 B1 KR 100803715B1
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Abstract
본 발명은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 이용하여 가시광선을 커버(cover)하는 액정필름을 제조하고, 이 필름에 1/4λ 위상차필름을 부착하고 반대면에 프리즘패턴을 첨가하여 액정표시 소자의 휘도를 획기적으로 향상시킬 수 있는 반사형 편광막을 제조하는 방법에 관한 것으로, 선택반사 파장영역이 다른 2층 이상의 콜레스테릭 액정필름층이 단파장에서 장파장의 순서로 적층되며, 이 필름에 1/4λ 위상차필름을 부착하고 반대면에 프리즘패턴을 제조하여 일체형 필름을 제조함에 의해 액정표시 소자의 휘도를 극대화 되도록 한 것을 특징으로 한다.The present invention provides a liquid crystal film covering visible light using cholesteric liquid crystal films having different selective reflection wavelength ranges, attaching a 1 / 4λ retardation film to the film and adding a prism pattern to the opposite side. The present invention relates to a method of manufacturing a reflective polarizing film that can significantly improve the brightness of a liquid crystal display device, wherein two or more cholesteric liquid crystal film layers having different selective reflection wavelength ranges are laminated in the order of short wavelength to long wavelength. By attaching a 1 / 4λ retardation film to the film and manufacturing a prism pattern on the opposite side, it is characterized in that to maximize the brightness of the liquid crystal display device by manufacturing an integrated film.
콜레스테릭 액정필름, 프리즘 패턴, 반사형편광막, 선택반사 Cholesteric liquid crystal film, prism pattern, reflective polarizing film, selective reflection
Description
도 1은 본 발명의 필름의 구조를 나타낸 단면도.1 is a cross-sectional view showing the structure of a film of the present invention.
도 2는 본 발명의 액정표시장치의 구조를 나타낸 단면도.2 is a cross-sectional view showing the structure of a liquid crystal display of the present invention.
도 3은 본 발명의 프리즘 패턴을 형성하는 공정.3 is a step of forming a prism pattern of the present invention.
[도면의 주요부분에 대한 부호의 설명][Explanation of symbols on the main parts of the drawings]
1:접착제층 2:콜레스테릭 액정 층1: adhesive layer 2: cholesteric liquid crystal layer
3:위상차 필름 4:기재 필름3: retardation film 4: base film
5:프리즘패턴층 6:흡수형 편광판5: Prism pattern layer 6: Absorption type polarizing plate
7:위상차 필름 8:점착제층7: Retardation film 8: Adhesive layer
9:콜레스테릭 액정 층 10:확산판9: cholesteric liquid crystal layer 10: diffusion plate
11:도광판 12:반사판11: Light guide plate 12: Reflective plate
13:광원13: light source
20:광대역 콜레스테릭액정 필름20: wide band cholesteric liquid crystal film
30:액정 판넬30: LCD panel
40:프리즘패턴 갖는 일체형 광대역 반사형 편광판40: Integrated broadband reflective polarizer with prism pattern
50:백라이트 유니트50: backlight unit
현재 일반적으로 사용되고 있는 액정표시소자(LCD)는 선편광을 이용하기 때문에, 편광막을 사용하고 있다. 상기 편광막은 폴리비닐알코올(PVA) 필름에 요오드나 이색성염료를 흡착시키고, 이것을 일정방향으로 연신하여 제조한다.Liquid crystal display devices (LCDs), which are generally used today, use polarized films because they use linearly polarized light. The polarizing film is prepared by adsorbing iodine or a dichroic dye on a polyvinyl alcohol (PVA) film and stretching it in a predetermined direction.
상기와 같이 제조된 편광막은 그 자체가 투과축의 방향에 대한 기계적 강도가 약하고, 열이나 수분에 의해 수축하여 편광기능이 현저히 저하되기 때문에, 실용적인 편광막으로 사용할 수 없다. 이러한 결점을 보완하기 위해 초산 셀룰로오스 필름 등의 지지체 사이에 접착제로 합착시킨 구조로 된 편광막이 개발되었다.The polarizing film prepared as described above cannot be used as a practical polarizing film because the mechanical strength of the polarizing film itself is weak in the direction of the transmission axis, shrinks due to heat or moisture, and the polarizing function is significantly reduced. In order to compensate for this drawback, a polarizing film having a structure in which an adhesive is bonded between supports such as a cellulose acetate film has been developed.
상기와 같은 폴리비닐알코올 필름을 이용한 편광막은 한쪽 방향으로 진행되는 빛은 흡수하고, 다른 한쪽으로 진동하는 빛만을 통과시켜 선편광을 만들기 때문에, 편광막의 효율이 이론적으로 50%를 넘을 수 없어서 LCD의 효율과 휘도를 저하시키는 가장 큰 요인이 되고 있다. Since the polarizing film using the polyvinyl alcohol film as described above absorbs light traveling in one direction and passes only the light vibrating to the other side, the polarizing film can be linearly polarized, so the efficiency of the polarizing film cannot theoretically exceed 50%, so the efficiency of the LCD Excessive brightness is becoming the biggest factor.
콜레스테릭 액정을 이용하여 제조된 반사형 편광막을 추가로 사용하면 기존 편광막의 단점을 크게 개선시킬 수 있다. 콜레스테릭 액정은 액정의 나선형 구조의 꼬인 방향과 원편광 방향이 일치하고, 파장이 액정의 나선피치와 같은 원편광의 빛만을 반사하는 선택반사 특성이 있다. 이 선택반사 특성을 이용하면 일정한 파장대 역의 비편광을 특정한 원편광으로 변환시키는 편광막의 제조가 가능하다. Further use of a reflective polarizing film manufactured using a cholesteric liquid crystal can greatly improve the disadvantages of the existing polarizing film. The cholesteric liquid crystal has a selective reflection characteristic in which the twisted direction of the helical structure of the liquid crystal coincides with the circularly polarized light direction and whose wavelength reflects only circularly polarized light such as the spiral pitch of the liquid crystal. By using this selective reflection characteristic, it is possible to manufacture a polarizing film which converts unpolarized light in a certain wavelength band into a specific circularly polarized light.
즉 좌원편광과 우원편광 성분이 절반씩 혼재되어 있는 비편광이 좌선성 또는 우선성 나선구조를 갖는 콜레스테릭 액정필름에 입사되면 나선방향과 같은 원편광은 반사되고 반대방향의 원편광은 투과된다. 이 때 투과된 원편광은 1/4λ 위상차필름을 통과하면 선편광으로 바뀌게 된다. 그리고 이렇게 반사된 원편광은 반사판에서 재반사되면 편광방향이 바뀌기 때문에 액정필름을 투과하게 된다. 따라서 콜레스테릭 액정필름으로 제조된 편광막을 추가로 사용하면 이론적으로 빛의 손실이 없기 때문에 50% 빛을 흡수하는 종래의 흡수형 편광막만을 사용하는 것에 비해 휘도를 획기적으로 향상시킬 수 있다. That is, when non-polarized light in which left circular polarization and right circular polarization components are mixed in half enters the cholesteric liquid crystal film having a left linearity or preferential spiral structure, circularly polarized light such as helical direction is reflected and circularly polarized light in the opposite direction is transmitted. . At this time, the transmitted circularly polarized light is changed to linearly polarized light when passing through the 1 / 4λ retardation film. The reflected circularly polarized light is transmitted through the liquid crystal film because the polarization direction is changed when it is reflected back from the reflector. Therefore, when the polarizing film made of the cholesteric liquid crystal film is additionally used, since there is no loss of light in theory, the luminance may be significantly improved as compared with the conventional absorption type polarizing film which absorbs 50% of light.
그런데, LCD에 사용되는 백라이트에서는 주로 색을 나타내는 영역인 가시광선대역(400-700nm)의 빛을 발생시킨다. 따라서 콜레스테릭 액정필름의 선택반사 파장영역이 가시광선영역을 커버해야 하며, 만약 커버하지 못하면 선택 반사되어 재활용되지 못한 파장의 빛은 비편광상태로 편광막을 투과하게 되어 LCD의 화질을 저하시키는 문제점을 발생시키게 된다. However, the backlight used in the LCD generates light in the visible light band (400-700 nm), which is mainly a color display area. Therefore, the selective reflection wavelength region of the cholesteric liquid crystal film should cover the visible light region, and if it does not cover, the light of the wavelength which is not selectively reflected and recycled is transmitted through the polarizing film in a non-polarized state to deteriorate the image quality of the LCD. Will be generated.
또한 LCD는 백라이트 유니트에서 여러 가지 기능성 필름을 겹쳐서 사용하고 있는데, 이 경우, 각각의 필름을 통과할 때마다 계면에서 산란현상이 발생하게 되어 휘도가 저하된다. LCD 백라이트 필름 중, 광원에서 발생한 빛을 정면으로 집광시켜 휘도를 향상시키는 프리즘 필름이 사용되고 있는데 일반적으로 프리즘 필름은 코팅 방식 등을 사용하여 프리즘 패턴을 필름에 형상화 시켜 제조하고 있는데 두장을 수직으로 겹쳐 사용하고 있으나 계면에서 산란이 존재하는 기존방식의 문제점을 안고 있다. In addition, the LCD uses a plurality of functional films in the backlight unit, and in this case, scattering occurs at the interface every time the respective films pass through, thereby decreasing luminance. Among the LCD backlight films, prism films are used to condense the light generated from the light source to the front to improve the brightness. Generally, the prism film is manufactured by forming a prism pattern on the film by using a coating method. However, there is a problem of the existing method in which scattering exists at the interface.
본 발명의 과제는 종래의 편광막에 비해 휘도를 획기적으로 향상시키는 콜레스테릭 액정필름에 프리즘 패턴을 형상화함에 의해 일체형 반사형 편광막을 제조하여 필름과 필름의 계면을 제거하여 광의 필름 통과 시 산란 현상을 방지하여 휘도향상을 극대화하는 새로운 액정표시소자용 반사형 편광막을 제공하는 것이다.An object of the present invention is to produce an integrated reflective polarizing film by forming a prism pattern on the cholesteric liquid crystal film that significantly improves the brightness compared to the conventional polarizing film to remove the interface between the film and the film scattering phenomenon of light passing through the film It is to provide a new reflective polarizing film for liquid crystal display device to maximize the brightness improvement by preventing the.
본 발명의 구체적인 목적은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 적층하여 가시광선영역을 커버(cover)하는 액정필름을 제조하고, 이 필름에 1/4λ 위상차필름을 부착하고 반대면에 프리즘패턴을 제조하여 일체화함에 의해 액정표시소자의 휘도를 향상시키는 반사형 편광막 및 그의 제조하는 방법을 제공하는 것에 관한 것이다. A specific object of the present invention is to prepare a liquid crystal film covering the visible light region by stacking cholesteric liquid crystal films having different selective reflection wavelength ranges, attaching a 1 / 4λ retardation film to the film and The present invention relates to a reflective polarizing film for improving the luminance of a liquid crystal display device by manufacturing and integrating a prism pattern, and a method of manufacturing the same.
본 발명의 또 다른 목적은 상기 반사편광막을 구비하는 액정표시장치를 제공하는 것이다.Another object of the present invention is to provide a liquid crystal display device having the reflective polarizing film.
상기 목적을 달성하기 위해 본 발명은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 적층하는 방법에 의해 가시광선을 커버하는 액정필름을 제조하고, 이 필름에 1/4λ 위상차필름을 부착하고 반대면에 프리즘패턴을 코팅방법을 이용 제조하여 일체화함에 의해 액정표시소자의 휘도를 획기적으로 향상시키는 방법을 사용하였다.In order to achieve the above object, the present invention provides a liquid crystal film covering visible light by laminating cholesteric liquid crystal films having different selective reflection wavelength ranges, attaching a 1 / 4λ retardation film to the film and vice versa. A method of dramatically improving the luminance of the liquid crystal display device was used by manufacturing and integrating a prism pattern on a surface.
본 발명을 보다 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.
본 발명에서는 경화성 콜레스테릭 액정물질과 광개시제를 유기용제에 녹여 기판에 도포한 후 UV경화에 의해 제조시킨 콜레스테릭 액정필름을 사용하였다. 상기 경화성 콜레스테릭 액정물질은 경화성 네마틱 액정물질과 경화성 카이럴(chiral)물질로 이루어져 있으며, 이 두 물질의 조성에 따라 선택반사 파장영역을 조절할 수 있다.In the present invention, a curable cholesteric liquid crystal material and a photoinitiator were dissolved in an organic solvent and applied to a substrate, and then a cholesteric liquid crystal film prepared by UV curing was used. The curable cholesteric liquid crystal material is composed of a curable nematic liquid crystal material and a curable chiral material, and the selective reflection wavelength range may be adjusted according to the composition of the two materials.
경화성 네마틱 액정물질과 경화성 카이럴물질은 네마틱 액정을 나타내는 메소젠기를 포함하는 액정물질이면 모두 사용가능하고, 카이럴물질 역시 통상의 카이럴탄소를 가지는 물질이면 가능하므로, 특별히 사용가능한 것을 한정하지는 않는다. 본 발명에서 경화성이란 열경화 또는 자외선 경화 가능한 반응성기를 분자구조 내에 구비한 물질이라면 가능하다. 예를 들면 열경화를 하는 경우는 비닐기, 아크릴기, 메타크릴기, 비닐리덴기, 아릴기 등의 비닐기를 포함하거나, 축중합 가능한 다양한 반응성기를 가지는 단량체들의 조합을 사용할 수 있다. 자외선 경화가능한기는 상기의 반응성 기중에서 비닐기, 아크릴기, 메타크릴기, 비닐리덴기, 아릴기 등의 자외선에 의해 가교가능한 반응성기는 모두 가능하다. 경화시에는 개시제와 필요에 의해 레벨링제 등의 첨가제를 사용할 수 있다.The curable nematic liquid crystal material and the curable chiral material may be used as long as the liquid crystal material includes a mesogenic group representing the nematic liquid crystal, and the chiral material may be a material having ordinary chiral carbon, so that it can be specifically used. It doesn't. Curable in the present invention may be any material provided with a reactive group capable of thermosetting or ultraviolet curing in the molecular structure. For example, in the case of thermosetting, a combination of monomers including vinyl groups such as vinyl group, acrylic group, methacryl group, vinylidene group and aryl group, or having various reactive groups capable of polycondensation may be used. The ultraviolet curable group can be any reactive group crosslinkable by ultraviolet rays such as vinyl group, acrylic group, methacryl group, vinylidene group, aryl group among the reactive groups. At the time of hardening, additives, such as a leveling agent, can be used as an initiator and as needed.
액정물질의 도포 시 기판으로는 PET(폴리에틸렌테레프탈레이트), PVA(폴리비닐알콜), TAC(트리아세틸 셀룰로오스)등의 플라스틱필름 등을 사용할 수 있다. 콜레스테릭 액정물질은 도포 시 수평배향을 유도하여야만 선택반사 특성을 부여할 수 있다. 이 수평배향을 유도하는 방법에는 수평배향막, 전장 인가, 전단응력(shear force) 부여 등의 방법을 통상적으로 사용한다.When the liquid crystal material is applied, plastic films such as PET (polyethylene terephthalate), PVA (polyvinyl alcohol), and TAC (triacetyl cellulose) may be used. The cholesteric liquid crystal material can give selective reflection characteristics only when inducing horizontal alignment during application. As a method of inducing the horizontal alignment, methods such as a horizontal alignment film, electric field application, and shear force application are commonly used.
본 발명에서는 상기 방법 중 전단응력을 부여하여 배향을 유도하는 방법을 사용했다. 이 방법은 롤코팅등 코팅방법을 이용하여 콜레스테릭 액정물질을 도포시 수평배향을 유도하는 방법이다. In the present invention, a method of inducing orientation by applying shear stress was used. This method is to induce horizontal orientation when applying cholesteric liquid crystal material using a coating method such as roll coating.
가시광선 영역을 모두 선택반사하는 광대역 콜레스테릭 액정 필름을 제조하기 위해 서로 다른 선택반사 파장영역을 갖는 콜레스테릭 액정필름들을 적층함에 의해 제조하였다. 우선 플라스틱 필름에 콜레스테릭 액정물질이 용해된 용액을 롤코팅 방법을 사용하여 도포하고 건조기를 통과시켜 용제를 건조하면서 용제를 제거한 후 UV 조사를 통해 필름을 제조하였다. 이렇게 제조된 콜레스테릭 액정필름들을 접착제를 사용하여 적층하여 가시광선 영역을 모두 선택반사하는 광대역 콜레스테릭 액정필름을 제조하였다.In order to produce a broadband cholesteric liquid crystal film that selectively reflects all visible light regions, the cholesteric liquid crystal films having different selective reflection wavelength ranges were prepared by laminating. First, a solution in which a cholesteric liquid crystal material was dissolved in a plastic film was applied using a roll coating method, and the solvent was dried while removing the solvent while drying the solvent through a dryer to prepare a film through UV irradiation. The cholesteric liquid crystal films thus prepared were laminated using an adhesive to prepare a broadband cholesteric liquid crystal film that selectively reflects all visible light regions.
이렇게 제조된 콜레스테릭 액정필름을 투과한 빛은 원편광 상태이므로 LCD에서 사용하는 선편광으로 변환시켜야 LCD에 이용이 가능하게 된다. 이것은 1/4λ 위상차필름을 부착하여 해결하였다. Since the light transmitted through the cholesteric liquid crystal film thus prepared is circularly polarized, it is required to be converted to linearly polarized light used in the LCD to be used in the LCD. This was solved by attaching a 1 / 4λ retardation film.
상기에 사용된 1/4λ 위상차필름은 PVA, PC, m-COC등으로 제조된 것이며, 위상차 값은 115 ~ 125nm인 위상차 필름을 사용하였다. 위상차필름을 부착하지 않은 반대면에 프리즘 패턴을 형상화 하였다. 프리즘 패턴은 용제를 사용하지 않고 아크릴레이트계 단량체 및 첨가제를 formulation한 용액을 코팅방법을 사용하여 도포하고 프리즘패턴이 식각된 롤을 통과시키며 UV 경화를 진행시켜 형상화 하였다. The 1 / 4λ retardation film used above was made of PVA, PC, m-COC, etc., and a retardation film having a retardation value of 115 to 125 nm was used. The prism pattern was shaped on the opposite side without the retardation film. The prism pattern was formed by applying a solution containing an acrylate monomer and an additive using a coating method without using a solvent, passing through a roll in which the prism pattern was etched, and proceeding with UV curing.
본 발명에 따른 프리즘 패턴은 벤젠링을 많이 함유하는 구조의 올리고머 또는 모노머 및 그들의 혼합물로서 자외선 및 전자선에 의해서 경화되는 수지를 사용하는 것이 바람직하며, 방향족기를 가지는 이상 다양한 단량체를 사용할 수 있다. 예로서는 비스페놀에이 폴리페닐렌 디아크릴레이트, 디브로모 비스페놀에이(bisphenol A)폴리에톡시레이트 디아크릴레이트 올리고머 등의 방향족기를 가지는 올리고머와 2-하이드록시-3-페녹시-프로필 아크릴레이트, 비스페놀에이 디에틸렌 디아크릴레이트 등의 방향족기를 가지는 단량체를 단독 또는 혼합하여 사용하며, 상기 조성물에 상기 올리고머 및/또는 단량체를 경화시키는 광개시제를 첨가하여 자외선 하에서 경화하여 사용한다. In the prism pattern according to the present invention, it is preferable to use a resin cured by ultraviolet rays and electron beams as oligomers or monomers having a high benzene ring structure and mixtures thereof, and various monomers having an aromatic group can be used. Examples include an oligomer having an aromatic group such as bisphenol A polyphenylene diacrylate, dibromo bisphenol A polyethoxylate diacrylate oligomer, 2-hydroxy-3-phenoxy-propyl acrylate, bisphenol A Monomers having an aromatic group, such as diethylene diacrylate, are used alone or in combination, and a photoinitiator for curing the oligomer and / or monomer is added to the composition and cured under ultraviolet light.
프리즘패턴은 그라비아 롤 코팅기, 또는 콤마 코팅기를 이용하여 일정두께의 코팅액을 기재에 코팅하고 건조기를 통해 용매를 건조시키고, 프리즘 패턴 롤과 자외선 경화기를 동시에 통과시켜 완전한 경화 도막을 얻는다. 이 때 코팅기를 통해 기재필름에 올리는 코팅액의 두께는 10 ~ 45 μm의 두께로 코팅하는데 , 15 ~ 25μm 가 가장 바람직하다. 코팅 면에 양각화된 프리즘 패턴을 코팅액이 묻어있는 기재 면과 찍어 눌러 패턴을 형상화하고, 반대면에 UV경화장치를 통해서 프리즘부의 정각을 고정화시켜 제조한다. 굴절율은 1.6 이상인 것이 바람직하며, 프리즘 패턴의 정각은 50 ~ 150도 사이가 되도록 하는 것이 바람직하다.The prism pattern is coated with a gravure roll coater or a comma coater on a substrate with a predetermined thickness, the solvent is dried through a dryer, and simultaneously passed through a prism pattern roll and an ultraviolet curing machine to obtain a complete cured coating film. At this time, the thickness of the coating liquid raised to the base film through the coating machine is coated with a thickness of 10 ~ 45 μm, 15 ~ 25μm is most preferred. The embossed prism pattern on the coating surface is formed by pressing the substrate surface on which the coating liquid is buried to form a pattern, and fixing the right angle of the prism part through the UV curing device on the opposite surface. It is preferable that the refractive index is 1.6 or more, and it is preferable that the right angle of the prism pattern is between 50 and 150 degrees.
하기는 실시예를 통하여 본 발명을 구체적으로 설명하며, 하기의 실시예는 본 발명의 일실시예를 나타내는 것으로 본 발명이 그 실시예에 한정되는 것은 아니 다.Hereinafter, the present invention will be described in detail with reference to Examples, and the following Examples show one embodiment of the present invention, and the present invention is not limited thereto.
[실시예 1] Example 1
우선 콜레스테릭 액정필름을 제조하였다. 경화성 콜레스테릭 액정물질(BASF사, LC242, LC756)을 메틸에틸케톤(MEK)과 톨루엔을 6:4의 비율로 혼합한 용제에 50wt%의 농도를 갖도록 용액을 제조하였다. 상기용액 제조 시 네마틱물질(LC242)과 카이럴물질(LC756)의 혼합비를 조절하여 선택반사 중심파장이 각각 430, 480, 520, 580, 650, 720nm가 되도록 각각 제조하였으며, 5 wt%의 광개시제(IG184,Ciba-Geigy)와 0.2 wt%의 레벨링 첨가제(BYK361, BYK사)를 첨가하였다. 상기 제조된 용액 중 우선 430nm 용액을 폴리에틸렌테레프탈레이트(PET)필름위에 롤코팅(roll coating)방법에 의해 박막 도포하였다. 도포 후 건조기에서 용제를 건조시키며 액정을 배향시킨 후 UV광조사를 통해 필름을 제조하였다. 이때, 건조 조건은 85℃ 이었고, UV광조사는 300W(중심파장 360nm)램프를 사용하였다. First, a cholesteric liquid crystal film was prepared. A solution was prepared such that a curable cholesteric liquid crystal material (BASF, LC242, LC756) was mixed with methyl ethyl ketone (MEK) and toluene in a ratio of 6: 4 to 50 wt%. When the solution was prepared, the selective reflection center wavelengths were respectively adjusted to 430, 480, 520, 580, 650, and 720 nm by adjusting the mixing ratio of the nematic material (LC242) and the chiral material (LC756), and 5 wt% of the photoinitiator. (IG184, Ciba-Geigy) and 0.2 wt% leveling additive (BYK361, BYK) were added. Among the prepared solutions, a 430 nm solution was first applied to the polyethylene terephthalate (PET) film by a thin film by a roll coating method. After coating, the solvent was dried in a drier and the liquid crystals were oriented to prepare a film through UV light irradiation. At this time, the drying conditions were 85 ℃, UV light irradiation was used 300W (center wavelength 360nm) lamp.
이 같은 코팅공정을 반복적으로 실시하여 430, 480, 520, 580, 650, 720nm 의 콜레스테릭 액정 필름을 제조하였다. 이 콜레스테릭 액정필름들을 접착제를 사용하여 단파장에서 장파장의 순서로 차례로 적층하였다. 이때, 액정필름들만 적층되도록 PET필름은 제거하며 적층 하였다. 제조된 액정필름의 두께는 각각 3.5 ~ 4.5micron 로 전체 필름의 두께는 25micron 이었다. This coating process was repeatedly performed to prepare cholesteric liquid crystal films of 430, 480, 520, 580, 650, and 720 nm. These cholesteric liquid crystal films were laminated in order from short wavelength to long wavelength using an adhesive. At this time, the PET film was removed and laminated so that only liquid crystal films were stacked. The thickness of the prepared liquid crystal film was 3.5 to 4.5 microns, respectively, and the thickness of the entire film was 25 micron.
상기와 같이 제조된 액정필름의 단파장 면에 감압점착제(Pressure sensitive adhesive,PSA)가 코팅된 1/4λ 위상차필름(중심파장 115nm)을 상온에서 압착하여 위상차필름을 부착하였다. 위상차 필름이 부착되지 않은 반대면에 자외선 경화형 수지로 프리즘(Prism)패턴을 제조하였다. 제조된 프리즘 부의 굴절률은 1.60 이고 프리즘의 정각이 90°이었다. 프리즘패턴제조에 사용된 자외선 경화형 조성물은 비스페놀에이(bisphenol A) 폴리페닐렌 디아크릴레이트 올리고머 60 중량%, 2-하이드록시-3-페녹시-프로필 아크릴레이트 모노머 40 중량%의 경화형 조성물에 개시제로 머크(Merck社) 개시제 "Darocure 1173"를 경화형 조성물의 전체 함량에 대하여 3 중량% 를 혼합하여 그림 3과 같은 공정을 통해 30 μm 의 두께로 코팅하고 패턴을 찍어서 UV경화장치를 통해서 프리즘부의 정각을 고정화하였다. A 1 / 4λ retardation film (center wavelength 115nm) coated with a pressure sensitive adhesive (PSA) on the short wavelength surface of the liquid crystal film prepared as described above was pressed at room temperature to attach a retardation film. A prism pattern was made of an ultraviolet curable resin on the opposite side to which the retardation film was not attached. The refractive index of the prepared prism portion was 1.60 and the prism angle was 90 °. The UV curable composition used in the production of the prism pattern was used as an initiator in the curable composition of 60% by weight of bisphenol A polyphenylene diacrylate oligomer and 40% by weight of 2-hydroxy-3-phenoxy-propyl acrylate monomer. Merck Initiator "Darocure 1173" is mixed with 3% by weight, based on the total content of the curable composition, coated to a thickness of 30 μm through a process as shown in Figure 3, and patterned to obtain the right angle of the prism part through a UV curing device. Immobilized.
제조한 반사편광막의 휘도를 측정한 결과 흡수형 편광막(Nitto Denko사의 NPF grade)을 사용한 경우에 비하여 휘도가 67% 이상 개선되었음을 알 수 있었다.As a result of measuring the luminance of the prepared reflective polarizing film, the luminance was improved by more than 67% compared with the case of using the absorption type polarizing film (NPFto Nenko grade).
[실시예 2] Example 2
콜레스테릭 액정필름을 제조하였다. 경화성 콜레스테릭 액정물질(BASF사, LC242, LC756)을 메틸에틸케톤(MEK)과 톨루엔을 6:4의 비율로 혼합한 용제에 50 wt%의 농도를 갖도록 용액을 제조하였다. 상기용액 제조시 네마틱물질(LC242)과 카이럴물질(LC756)의 혼합비를 조절하여 선택반사 중심파장이 각각 435, 485, 520, 570, 620, 670, 730nm가 되도록 각각 제조하였으며, 5wt%의 광개시제(IG184,Ciba-Geigy)와 0.2wt%의 레벨링 첨가제(BYK361, BYK사)를 첨가하였다. 상기 제조된 용액 중 우선 435nm 용액을 폴리에틸렌테레프탈레이트(PET)필름위에 롤코팅(roll coating)방법에 의해 박막 도포하였다. 도포 후 건조기에서 용제를 건조시키고 UV 광조사를 통해 필름을 제조하였다. 이때, 건조 조건은 85℃ 이었고, UV광조사는 300W(중심파장 360nm)램프를 사용하였다. A cholesteric liquid crystal film was prepared. A solution was prepared such that a curable cholesteric liquid crystal material (BASF, LC242, LC756) was mixed with methyl ethyl ketone (MEK) and toluene in a ratio of 6: 4 to 50 wt%. When the solution was prepared, the selective reflection center wavelengths were respectively adjusted to 435, 485, 520, 570, 620, 670, and 730 nm by adjusting the mixing ratio of nematic material (LC242) and chiral material (LC756). Photoinitiator (IG184, Ciba-Geigy) and 0.2 wt% leveling additive (BYK361, BYK) were added. In the prepared solution, a 435 nm solution was first applied to the polyethylene terephthalate (PET) film by a thin film by a roll coating method. After application, the solvent was dried in a dryer and a film was prepared by UV light irradiation. At this time, the drying conditions were 85 ℃, UV light irradiation was used 300W (center wavelength 360nm) lamp.
이 같은 코팅공정을 반복적으로 실시하여 435, 485, 520, 570, 620, 670, 730nm 의 콜레스테릭 액정 필름을 제조하고 단파장에서 장파장의 순서로 이루어지도록 접착제를 사용하여 단파장에서 장파장의 순서로 차례로 적층하였다. 이때, 액정필름들만 적층되도록 PET필름은 제거하며 적층 하였다. 제조된 액정필름의 두께는 각각 3.5 ~ 4.5micron 로 전체 필름의 두께는 25micron 이었다. Repeat this coating process to produce 435, 485, 520, 570, 620, 670, 730 nm cholesteric liquid crystal film, and in order from short wavelength to long wavelength using an adhesive so as to be made in the order of short wavelength to long wavelength. Laminated. At this time, the PET film was removed and laminated so that only liquid crystal films were stacked. The thickness of the prepared liquid crystal film was 3.5 to 4.5 microns, respectively, and the thickness of the entire film was 25 micron.
상기와 같이 제조된 액정필름의 단파장 면에 감압점착제(Press sensitiveure adhesive,PSA)가 코팅된 1/4λ 위상차필름(중심파장 115nm)을 상온에서 압착하여 위상차필름을 부착하였다. 위상차 필름이 부착되지 않은 반대면에 자외선 경화형 수지로 프리즘(Prism)패턴을 제조하였다. 제조된 프리즘 부의 굴절률은 1.60 이고 프리즘의 정각이 90°이었다. 프리즘패턴은 디브로모 비스페놀에이(bisphenol A)폴리에톡시레이트 디아크릴레이트 올리고머 60 중량 %, 비스페놀에이 디에틸렌 디아크릴레이트 모노머 40 중량 %로 이루어진 경화형 조성물에 상기 조성물에 대하여 3중량%의 머크(Merck社) 개시제 "Darocure 1173" 혼합하고 상기의 조성액을 그림 3과 같은 공정을 통해 20 μm 의 두께로 코팅하고 패턴을 찍어서 UV경화장치를 통해서 프리즘부의 정각을 고정화하였다.A 1 / 4λ retardation film (center wavelength 115nm) coated with a pressure sensitive adhesive (PSA) on the short wavelength surface of the liquid crystal film prepared as described above was pressed at room temperature to attach a retardation film. A prism pattern was made of an ultraviolet curable resin on the opposite side to which the retardation film was not attached. The refractive index of the manufactured prism part is 1.60 And the prism's right angle was 90 degrees. The prism pattern is composed of 60% by weight of dibromo bisphenol A polyethoxylate diacrylate oligomer and 40% by weight of bisphenol A diethylene diacrylate monomer in a curable composition comprising 3% by weight of Merck ( Merck) Initiator "Darocure 1173" mixed and 20 μm of the composition solution through the process shown in Figure 3 It was coated with a thickness of and the pattern was imprinted to fix the right angle of the prism portion through the UV curing device.
제조한 반사편광막의 휘도를 측정한 결과 흡수형 편광막(Nitto Denko사의 NPF grade)을 사용한 경우에 비하여 휘도가 71% 이상 개선되었음을 알 수 있었다.As a result of measuring the luminance of the prepared reflective polarizing film, the luminance was improved by more than 71% compared with the case of using the absorbing polarizing film (NPFto Nenko grade).
이상과 같은 방법으로 제조된 본 발명의 프리즘패턴을 갖는 반사형 편광판은 확산판을 통과한 빛을 효과적으로 집광시키며 가시광선영역의 전 파장대역을 선택반사하기 때문에, 기존의 흡수형 편광판에 비해 LCD의 휘도를 획기적으로 향상시키는 효과가 있다.The reflective polarizer having the prism pattern of the present invention manufactured as described above effectively condenses the light passing through the diffuser plate and selectively reflects the entire wavelength band of the visible light region. There is an effect of significantly improving the brightness.
실제로 제조된 프리즘패턴 반사형 편광판을 LCD panel에 장착하여 휘도를 측정한 결과 본 발명의 반사형 편광판을 사용하지 않았을 때의 휘도를 100이라고 할 경우, 본 발명의 반사형 편광판을 적용하여 165, 즉 65% 정도 휘도가 향상됨을 확인할 수 있었다. When the luminance was measured by mounting the prism pattern reflective polarizer manufactured on the LCD panel, and the luminance when the reflective polarizer of the present invention was not used is 100, the reflective polarizer of the present invention was applied to 165, that is, It was confirmed that the brightness is improved by about 65%.
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| KR19980071426A (en) * | 1997-02-18 | 1998-10-26 | 기타지마 요시토시 | Polarization Separation Film, Backlight System and Liquid Crystal Display |
| KR19990004687A (en) * | 1997-06-28 | 1999-01-25 | 성재갑 | Optical sheet for liquid crystal display panel and its manufacturing method |
| KR20010065713A (en) * | 1999-12-30 | 2001-07-11 | 권문구 | Broadband polarizer for liquid crystal device using lamination method |
| KR20060029461A (en) * | 2004-10-01 | 2006-04-06 | 삼성정밀화학 주식회사 | Prism-patterned broadband reflective polarizer for liquid crystal display |
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| KR19980071426A (en) * | 1997-02-18 | 1998-10-26 | 기타지마 요시토시 | Polarization Separation Film, Backlight System and Liquid Crystal Display |
| KR19990004687A (en) * | 1997-06-28 | 1999-01-25 | 성재갑 | Optical sheet for liquid crystal display panel and its manufacturing method |
| KR20010065713A (en) * | 1999-12-30 | 2001-07-11 | 권문구 | Broadband polarizer for liquid crystal device using lamination method |
| KR20060029461A (en) * | 2004-10-01 | 2006-04-06 | 삼성정밀화학 주식회사 | Prism-patterned broadband reflective polarizer for liquid crystal display |
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