KR100349314B1 - Broadband polarizer for liquid crystal device using lamination method - Google Patents
Broadband polarizer for liquid crystal device using lamination method Download PDFInfo
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- KR100349314B1 KR100349314B1 KR1019990065640A KR19990065640A KR100349314B1 KR 100349314 B1 KR100349314 B1 KR 100349314B1 KR 1019990065640 A KR1019990065640 A KR 1019990065640A KR 19990065640 A KR19990065640 A KR 19990065640A KR 100349314 B1 KR100349314 B1 KR 100349314B1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- 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
- G02F1/133528—Polarisers
Abstract
본 발명은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 적층하는 방법에 의해 가시광선영역을 커버(cover)하는 액정필름을 제조하고, 이 필름에 수직배향된 액정필름과 ¼λ위상차필름을 부착하여 액정표시소자용 편광막을 제조하는 방법에 관한 것으로, 선택반사 파장영역이 다른 4층 이상의 콜레스테릭 액정필름층이 중심파장에 기초하여 단파장에서 장파장의 순서대로 접착 적층되어 가시광선영역을 선택반사 파장영역으로 가지는 원편광 분리층 및 이 필름에 수직배향 액정필름과 위상차 필름을 차례로 접착 적층한 것을 특징으로 한다.According to the present invention, a liquid crystal film covering a visible light region is manufactured by a method of stacking cholesteric liquid crystal films having different selective reflection wavelength ranges, and the liquid crystal film and the ¼λ phase difference film are vertically aligned to the film. The present invention relates to a method for manufacturing a polarizing film for a liquid crystal display device, wherein four or more cholesteric liquid crystal film layers having different selective reflection wavelength regions are adhesively laminated in the order of short wavelength to long wavelength based on the central wavelength to select visible light region. A circularly polarized light separating layer having a wavelength region, and a vertically aligned liquid crystal film and a retardation film are sequentially laminated on the film.
Description
본 발명은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 적층하는 방법에 의해 가시광선영역을 커버(cover)하는 액정필름을 제조하고, 이 필름에수직배향된 액정필름과 ¼λ위상차필름을 부착하여 액정표시소자용 편광막을 제조하는 방법에 관한 것이다.The present invention provides a liquid crystal film covering a visible light region by laminating cholesteric liquid crystal films having different selective reflection wavelength ranges, and attaching a vertically oriented liquid crystal film and a ¼λ phase difference film to the film. The present invention relates to a method for producing a polarizing film for liquid crystal display device.
현재 일반적으로 사용되고 있는 액정표시소자(LCD)는 선편광을 이용하기 때문에, 편광막을 사용한다. 상기 편광막은 PVA(폴리비닐알코올) 필름에 요오드나 이색성염료를 흡착시키고, 이것을 일정방향으로 연신하여 제조한다.A liquid crystal display (LCD) generally used at present uses a polarization film because it uses linear polarization. The polarizing film is prepared by adsorbing iodine or a dichroic dye on a PVA (polyvinyl alcohol) 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 편광자로서 사용할 수 없다. 이러한 결점을 보완하기 위해 초산 셀룰로오스 필름 등의 지지체 사이에 끼워져 접착제로 고정시킨 구조로 되어 있다.The polarizing film produced as described above cannot be used as a practical polarizer because its own mechanical strength with respect to the direction of the transmission axis is weak, shrinkage due to heat or moisture, and the polarization function is significantly reduced. In order to compensate for these drawbacks, the structure is sandwiched between supports such as cellulose acetate films and fixed with an adhesive.
상기와 같은 폴리비닐알코올 필름을 이용한 편광막은 한쪽 방향으로 진동하는 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. 또한 상기 PVA는 수용성 고분자이기 때문에 내수성과 내열성이 떨어져 편광막의 내구성이 좋지 않다. 현재 내습열성을 향상시키는 유효한 방법으로서는 붕산이나 글리옥살 등의 가교반응에 의해 OH기의 감소를 도모하는 포르말(formal)화 및 열처리 공정이 채용되고 있다. 따라서 편광효율이 높고 제조공정이 간단한 편광막을 제조하기 위한 더욱 개선된 방법이 요구되어 왔다.Since the polarizing film using the polyvinyl alcohol film as described above absorbs light vibrating in one direction and only passes the light vibrating in the other direction, it creates linearly polarized light. Since the efficiency of the polarizing film can not theoretically exceed 50%, it is the biggest factor that lowers the efficiency and brightness of the LCD. In addition, since the PVA is a water-soluble polymer, the water resistance and heat resistance are poor, and the durability of the polarizing film is not good. As an effective method for improving the heat and humidity resistance, a formalization and heat treatment process for reducing the OH group by a crosslinking reaction such as boric acid or glyoxal has been adopted. Therefore, there is a need for a further improved method for producing a polarizing film having a high polarization efficiency and a simple manufacturing process.
콜레스테릭 액정을 이용하여 제조된 편광막을 추가로 사용하면 기존 편광막의 단점을 크게 개선시킬 수 있다. 콜레스테릭 액정은 액정의 나선형 구조의 꼬인방향과 원편광 방향이 일치하고, 파장이 액정의 나선피치와 같은 원편광의 빛만을 반사하는 선택 반사 특성이 있다. 이 선택반사특성을 이용하면 일정한 파장 대역의 비편광을 특정한 원편광으로 변환시키는 편광막의 제조가 가능하다. 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 ¼λ 위상차필름을 통과하면 선편광으로 바뀌게 된다. 그리고 이렇게 반사된 원편광은 반사판에서 재 반사되어 그 편광방향이 바뀐 후 액정필름에 다시 투과된다. 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.Further use of the polarizing film manufactured using the 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 twist direction of the helical structure of the liquid crystal coincides with the circular polarization direction, and the wavelength reflects only circular 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 of a certain wavelength band into a specific circularly polarized light. 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 changes to linearly polarized light when passing through the ¼λ retardation film. Then, the reflected circularly polarized light is reflected back from the reflecting plate and transmitted again to the liquid crystal film after the polarization direction is changed. 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 백라이트(back-light)에서는 주로 색을 나타내는 영역인 가시광선대역(400∼700㎚)의 빛을 발생시킨다. 따라서 콜레스테릭 액정필름의 선택반사 파장영역이 가시광선영역을 커버해야 하며, 만약 커버하지 못하면 선택 반사되어 재활용되지 못한 파장의 빛은 비편광 상태로 편광막을 투과하게 되어 LCD의 화질을 저하시키는 문제점이 있다.However, the backlight used in the LCD generates light in the visible light band (400 to 700 nm), which is mainly a color display area. Therefore, the selective reflection wavelength region of the cholesteric liquid crystal film must cover the visible light region, and if it does not cover, the light of the wavelength that is not reflected and recycled selectively passes through the polarizing film in a non-polarized state and degrades the image quality of the LCD. There is this.
그리고 콜레스테릭 액정필름은 정면에서 시야각이 커짐에 따라 반사되는 파장영역이 단파장으로 전이되어 색이 달라지는 성질을 가지고 있다. 따라서 이 필름만으로 LCD에 적용할 경우에는 시약각이 커짐에 따라 색의 왜곡이 생기게 되어 표시소자에 사용할 수 없게 된다.In addition, the cholesteric liquid crystal film has a property in which the color of the reflected wavelength is shifted to a shorter wavelength as the viewing angle increases in front. Therefore, when the film is applied to the LCD alone, the color of the reagent increases as the angle of the reagent increases, making it impossible to use the display device.
본 발명은 상기의 문제점을 해결하기 위해 이루어진 것으로, 그 목적은 종래의 편광막에 비해 휘도를 획기적으로 향상시키는 적층방법을 이용한 액정표시소자용 광대역 편광막의 제조방법을 제공함에 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a method of manufacturing a broadband polarizing film for a liquid crystal display device using a laminating method for significantly improving luminance as compared to a conventional polarizing film.
상기 목적을 달성하기 위해 본 발명은 선택반사 파장영역이 서로 다른 콜레스테릭 액정필름들을 적층하는 방법에 의해 가시광선영역을 커버하는 액정필름을 제조하고, 이 필름에 수직배향된 액정필름과 ¼λ 위상차필름을 부착하여 액정표시소자용 편광막을 제조했다.In order to achieve the above object, the present invention provides a liquid crystal film covering a visible light region by laminating cholesteric liquid crystal films having different selective reflection wavelength ranges, and having a ¼λ phase difference from the liquid crystal film oriented perpendicular to the film. The film was affixed and the polarizing film for liquid crystal display elements was produced.
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 단면도이다2 is a cross-sectional view showing the structure of a liquid crystal display of the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10: 편광막 20: 콜레스테릭 액정필름10: polarizing film 20: cholesteric liquid crystal film
30: 수직배향 액정필름 40: 위상차 필름30: vertical alignment liquid crystal film 40: retardation film
50: 액정셀 유니트 60: 상판 편광판50: liquid crystal cell unit 60: upper polarizing plate
70: 하판 편광판 80: 백라이트 유니트70: lower polarizing plate 80: backlight unit
90: 확산판 100: 도광판90: diffuser plate 100: light guide plate
110: 반사판 200: 램프110: reflector 200: lamp
이하에서 본 발명을 바람직한 실시예에 의해 보다 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to the following examples.
먼저 본 발명을 설명하면 경화성 콜레스테릭 액정물질을 유기용제에 녹여 기판에 도포한 후 UV 경화에 의해 제조된 콜레스테릭 액정필름을 사용했다. 이때 광개시제도 첨가했다.First, the present invention will be described by using a cholesteric liquid crystal film prepared by UV curing after dissolving the curable cholesteric liquid crystal material in an organic solvent applied to the substrate. Photoinitiator was also added at this time.
상기 경화성 콜레스테릭 액정물질은 경화성 네마틱 액정물질과 경화성 카이럴(chiral) 물질로 이루어져 있으며, 이 두 물질의 조성에 따라 선택반사 파장영역을 조절할 수 있었다.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 can be adjusted according to the composition of the two materials.
액정물질의 도포 시 기판으로서는 PET, PVA, 트리아세틸 셀루로스(TAC)등의 플라스틱필름등을 사용할 수 있다.When the liquid crystal material is applied, a plastic film such as PET, PVA, triacetyl cellulose (TAC), or the like may be used.
콜레스테릭 액정물질의 도포시 수평배향을 유도하여야만 선택반사특성을 부여할 수 있다. 이 수평배향을 유도하는 방법에는 수평배향막, 전장인가. 셰어 (shear)부여 등의 방법이 있다.When applying the cholesteric liquid crystal material, it is necessary to induce horizontal alignment to impart selective reflection characteristics. How to induce this horizontal alignment is horizontal alignment film, electric field. There are methods such as giving a shear.
본 발명에서는 상기 방법 중 가장 간단한 방법인 셰어에 의해 배향을 유도하는 방법을 사용했다. 이 방법은 액정물질을 도포 시에 액정물질이 코팅 롤에서 기판으로 전이될 때 셰어가 가해지도록 해서 배향을 유도하는 것이다.In the present invention, a method of inducing orientation by share, which is the simplest of the above methods, was used. This method induces an orientation by applying a share when the liquid crystal material is transferred from the coating roll to the substrate when the liquid crystal material is applied.
가시광선 영역을 모두 선택 반사하는 광대역 콜레스테릭 액정 필름을 제조하기 위해 서로 다른 선택반사 파장영역을 갖는 콜레스테릭 액정 필름을 4장 이상 적층했다.Four or more cholesteric liquid crystal films having different selective reflection wavelength regions were laminated in order to produce a wideband cholesteric liquid crystal film that selectively reflects all visible light regions.
콜레스테릭 액정 필름의 적층 시에 접착제를 사용했다. 접착제로서는 폴리에스테르계, 에폭시계. 폴리우레탄계, 아크릴계 등이 있으며, 이 중 어느 것을 사용해도 무방하다.An adhesive agent was used at the time of lamination | stacking a cholesteric liquid crystal film. Examples of the adhesive include polyester and epoxy. Polyurethane type, acryl type, etc. are mentioned, You may use any of these.
제조된 콜레스테릭 액정 필름은 중합관능기가 2개 이상인 단량체 형태에서 UV에 의해 중합이 진행되어 생성되어 가교밀도가 높다. 따라서 접착제를 사용하여 적층시 콜레스테릭 액정 필름의 계면에서 접착제가 필름내부로 확산되어 선택반사 파장 영역이 변화하는 현상은 일어나지 않았다.The prepared cholesteric liquid crystal film has a crosslinking density due to polymerization proceeding by UV in the form of a monomer having two or more polymerization functional groups. Therefore, when laminating using the adhesive, the adhesive diffused into the film at the interface of the cholesteric liquid crystal film so that the selective reflection wavelength region did not occur.
콜레스테릭 액정필름의 적층후 제품두께를 감소시키기 위해 한쪽의 기판을 박리(delamination)시키면서 적층공정을 반복하여 최종적으로는 기판이 없는 상태로 제품으로서 기능하도록 제조했다.In order to reduce the product thickness after lamination of the cholesteric liquid crystal film, the lamination process was repeated while delamination of one substrate was made to finally function as a product without a substrate.
이렇게 제조된 톨레스테릭 액정필름을 투과한 빛은 원편광 상태이므로 LCD에서 사용하는 선편광으로 변환시켜야 LCD에 이용이 가능하다. 이것은 ¼λ 위상차필름을 부착하여 해결했다.Since the light transmitted through the prepared toleric liquid crystal film is circularly polarized, it is necessary to convert the linearly polarized light used in the LCD to use the LCD. This was solved by attaching ¼λ retardation film.
상기의 사용된 ¼λ 위상차필름은 PVA나 PC등으로 제조된 것이며, 중심파장은 115㎚인 위상차필름을 사용했다.The ¼λ retardation film used was made of PVA, PC, etc., and a retardation film having a center wavelength of 115 nm was used.
그러나 콜레스테릭 액정필름은 정면에서 시야각이 커짐에 따라 반사되는 파장영역이 단파장으로 전이되어 색이 달라지는 성질을 가지고 있기 때문에. 이 필름만으로 LCD에 적용할 경우 시야각이 커짐에 따라 색의 왜곡이 생기게 되어 표시소자에 적용시 제약이 따르게 된다.However, the cholesteric liquid crystal film has a property that the color of the reflected wavelength is shifted to a shorter wavelength as the viewing angle increases from the front side. When applied to LCD using this film alone, color distortion occurs as the viewing angle is increased, which is a limitation when applied to the display device.
본 발명에서는 상기 단점을 개선하기 위해 보상필름으로써 수직배향된 액정필름을 사용했다.In the present invention, a vertically aligned liquid crystal film was used as a compensation film to improve the disadvantage.
수직배향된 필름은 중합 가능한 네마틱 액정 단량체를 기판위에 수직배향 시킨 후 UV 광조사에 의해 중합시켜 제조했다. 광학 보상 효과는 필름의 두께에 따라 좌우 되었으며. 본 발명에서는 3∼6㎛의 범위인 필름을 제조하여 사용했다.The vertically oriented film was prepared by vertically aligning a polymerizable nematic liquid crystal monomer on a substrate and then polymerizing by UV light irradiation. The optical compensation effect was dependent on the thickness of the film. In this invention, the film in the range of 3-6 micrometers was manufactured and used.
상기 수직배향 필름은 콜레스테릭 액정 필름과 ¼λ 위상차필름 사이에 위치하도록 접착제를 사용하여 적층했다. 이 때 콜레스테릭 액정 필름의 단파장 면에 수직배향필름을 합착하는 것이 보상효과에 있어서 유리하다.The vertically oriented film was laminated using an adhesive so as to be positioned between the cholesteric liquid crystal film and the ¼ lambda retardation film. At this time, bonding the vertical alignment film to the short wavelength surface of the cholesteric liquid crystal film is advantageous in the compensation effect.
이상과 같이 제조된 편광막의 구조가 도 1에 나타나 있다. 여기에서 “10”은 편광막이고, “20”은 콜레스테릭 액정필름층이며, “30”은 수직배향 액정필름이고, “40”은 위상차 필름이다.The structure of the polarizing film manufactured as above is shown in FIG. Here, "10" is a polarizing film, "20" is a cholesteric liquid crystal film layer, "30" is a vertically aligned liquid crystal film, and "40" is a retardation film.
상기와 같이 제조된 편광막을 LCD에 적용할 경우, 장착위치는 도 2에 나타냈다. 도 2에 나타내는 바와 같이 편광막(10)은 확산판(90)과 도광판(100)과 반사판(110)으로 이루어진 백라이트 유니트(80)의 확산판(90)과, 상판 편광판(60)과 하판 편광판(70)으로 이루어진 액정셀 유니트(50)의 하판 편광판(70) 사이에 장착하게 된다. 여기에서 “200”은 램프이다.When applying the polarizing film prepared as described above to the LCD, the mounting position is shown in FIG. As shown in FIG. 2, the polarizing film 10 includes a diffuser plate 90 of a backlight unit 80 including a diffuser plate 90, a light guide plate 100, and a reflector plate 110, an upper plate polarizer 60, and a lower plate polarizer. It is mounted between the lower plate polarizing plate 70 of the liquid crystal cell unit 50 consisting of (70). Where “200” is the lamp.
이 때 계면에서의 광손실을 최소화 하기 위해서 제조된 필름(10)과 하판 편광판(70)을 합착하거나. 확산판(90)과 합착하여 이용해도 좋다.At this time, in order to minimize the light loss at the interface to the film 10 and the lower polarizing plate 70 is bonded. It may be used in combination with the diffusion plate 90.
[제 1 실시예][First Embodiment]
우선 콜레스테릭 액정 필름을 제조했고, 경화성 콜레스테릭 액정물질(BASF사)을 메틸에틸케톤(MEK)에 45wt%의 농도를 갖도록 용액을 제조했다.First, a cholesteric liquid crystal film was prepared, and a solution of a curable cholesteric liquid crystal material (BASF) was prepared in methyl ethyl ketone (MEK) at a concentration of 45 wt%.
상기 용액에 5wt%의 광개시제(IG184, Ciba-Geigy)와 0. 2wt%의 첨가제 (BYK361, BYK사)를 첨가했다. 이 용액을 폴리에틸렌테레프탈레이트(PET) 필름(코오롱사)위에 롤코팅(roll coating)방법에 의해 박막 도포했다. 도포 후 건조기에서 용제를 건조시킨 후 UV 광조사를 했다.To the solution was added 5 wt% photoinitiator (IG184, Ciba-Geigy) and 0.2 wt% additive (BYK361, BYK). This solution was thinly coated on a polyethylene terephthalate (PET) film (Kolon) by a roll coating method. After coating, the solvent was dried in a dryer and then irradiated with UV light.
이 때 건조 조건은 85℃ 이었고, UV 광조사는 300W(중심파장 360㎚) 램프를 사용했다.At this time, the drying conditions were 85 ° C., and UV light irradiation used a 300 W (center wavelength 360 nm) lamp.
상기와 같은 방법으로 선택반사 중심파장이 각각 435, 485, 520, 580, 650, 720㎚인 콜레스테릭 액정필름을 제조했다.In the same manner as described above, cholesteric liquid crystal films having selective reflection center wavelengths of 435, 485, 520, 580, 650, and 720 nm, respectively.
다음으로 상기의 액정필름들을 접착제(AD-593/CAT-56, Toyo Morton사)를 사용하여 단파장에서 장파장의 순서로 차례로 적층했다. 적층은 80℃의 압착롤을 통과시켜 진행했다.Next, the liquid crystal films were laminated in order from short wavelength to long wavelength using an adhesive (AD-593 / CAT-56, Toyo Morton). Lamination progressed through the 80 degreeC press roll.
한쌍의 필름을 적층한 후 한면의 PET필름을 박리시키면서 적층을 진행하여결과적으로는 콜레스테릭 액정 필름끼리 적층이 되도록 했다. 적층 후 필름의 두께는 25㎛ 이었다.After laminating a pair of films, the lamination was carried out while the PET film on one side was peeled off. As a result, the cholesteric liquid crystal films were laminated. The thickness of the film after lamination was 25 μm.
제조된 적층 콜레스테릭 액정필름의 단파장 면에 수직배향된 액정필름을 같은 접착제를 사용하여 접착 적층했다. 사용된 수직배향 액정필름은 경화성 네마틱 액정(BASF사)을 사용하여 제조되었으며. 두께는 4. 7㎛ 이었다.The liquid crystal film oriented perpendicular to the short wavelength surface of the prepared laminated cholesteric liquid crystal film was adhesively laminated using the same adhesive. The vertically aligned liquid crystal film used was manufactured using a curable nematic liquid crystal (BASF). The thickness was 4. 7 μm.
마지막으로 수직배향 액정필름 면에 한면에 감압접착제(Pressure Sensitive Adhesive, PSA)가 코팅된 ¼λ 위상차필름(중심파장 115㎚, Lonza사)을 상온에서 압착하여 최종 필름 제품을 제조했다.Finally, a ¼λ retardation film (center wavelength 115 nm, Lonza Co., Ltd.) coated with a pressure sensitive adhesive (PSA) on one surface of the vertically aligned liquid crystal film was pressed at room temperature to prepare a final film product.
[제 2 실시예]Second Embodiment
우선 콜레스테릭 액정 필름을 제조했고, 경화성 콜레스테릭 액정물질(BASF사)을 메틸에틸케톤(MEK)에 45wt%의 농도를 갖도록 용액을 제조했다.First, a cholesteric liquid crystal film was prepared, and a solution of a curable cholesteric liquid crystal material (BASF) was prepared in methyl ethyl ketone (MEK) at a concentration of 45 wt%.
상기 용액에 5wt%의 광개시제(IG184, Ciba-Geigy)와 0. 2wt%의 첨가제 (BYK361, BYK사)를 첨가했다. 이 용액을 폴리에틸렌테레프탈레이트(PET) 필름(코오롱사)위에 롤코팅(roll coating)방법에 의해 박막 도포했다. 도포 후 건조기에서 용제를 건조시킨 후 UV 광조사를 했다.To the solution was added 5 wt% photoinitiator (IG184, Ciba-Geigy) and 0.2 wt% additive (BYK361, BYK). This solution was thinly coated on a polyethylene terephthalate (PET) film (Kolon) by a roll coating method. After coating, the solvent was dried in a dryer and then irradiated with UV light.
이 때 건조 조건은 85℃ 이었고, UV 광조사는 300W(중심파장 360㎚) 램프를 사용했다.At this time, the drying conditions were 85 ° C., and UV light irradiation used a 300 W (center wavelength 360 nm) lamp.
상기와 같은 방법으로 선택반사 중심파장이 각각 435, 485, 520, 570, 620, 670, 730㎚인 콜레스테릭 액정필름을 제조했다.In the same manner as described above, cholesteric liquid crystal films having selective reflection center wavelengths of 435, 485, 520, 570, 620, 670, and 730 nm were prepared.
다음으로 상기의 액정필름들을 접착제(AD-593/CAT-56, Toyo Morton사)를 사용하여 단파장에서 장파장의 순서로 차례로 적층했다. 적층은 80℃의 압착롤을 통과시켜 진행했다.Next, the liquid crystal films were laminated in order from short wavelength to long wavelength using an adhesive (AD-593 / CAT-56, Toyo Morton). Lamination progressed through the 80 degreeC press roll.
한쌍의 필름을 적층한 후 한면의 PET필름을 박리시키면서 적층을 진행하여 결과적으로는 콜레스테릭 액정 필름끼리 적층이 되도록 했다. 적층 후 필름의 두께는 30㎛ 이었다.After laminating a pair of films, the lamination was carried out while the PET film on one side was peeled off, and as a result, the cholesteric liquid crystal films were laminated. The thickness of the film after lamination was 30 μm.
제조된 적층 콜레스테릭 액정필름의 단파장 면에 수직배향된 액정필름을 같은 접착제를 사용하여 접착 적층했다. 사용된 수직배향 액정필름은 경화성 네마틱 액정(BASF사)을 사용하여 제조되었으며. 두께는 5. 4㎛ 이었다.The liquid crystal film oriented perpendicular to the short wavelength surface of the prepared laminated cholesteric liquid crystal film was adhesively laminated using the same adhesive. The vertically aligned liquid crystal film used was manufactured using a curable nematic liquid crystal (BASF). The thickness was 5. 4 mu m.
마지막으로 수직배향 액정필름 면에 한면에 감압접착제(Pressure Sensitive Adhesive, PSA)가 코팅된 ¼λ 위상차필름(중심파장 115㎚, Lonza사)을 상온에서 압착하여 최종 필름 제품을 제조했다.Finally, a ¼λ retardation film (center wavelength 115 nm, Lonza Co., Ltd.) coated with a pressure sensitive adhesive (PSA) on one surface of the vertically aligned liquid crystal film was pressed at room temperature to prepare a final film product.
이상과 같은 방법으로 제조되는 본 발명의 편광막은 종래의 흡수형 편광막에 비해 가시광선영역의 전 파장대역을 커버할 수 있기 때문에. LCD의 휘도를 획기적으로 향상시킬 수 있는 효과가 있다.Since the polarizing film of this invention manufactured by the above method can cover the full wavelength band of visible light region compared with the conventional absorption type polarizing film. There is an effect that can significantly improve the brightness of the LCD.
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| KR20030013942A (en) * | 2001-08-10 | 2003-02-15 | 엘지전선 주식회사 | A reflective polarizer using narrow-band cholesteric liquid crystal and its preparation method |
| JP4207180B2 (en) | 2001-11-15 | 2009-01-14 | 日東電工株式会社 | Phase difference plate, method for producing the same, and optical film |
| TWI258603B (en) | 2002-04-23 | 2006-07-21 | Nitto Denko Corp | Polarized light device, polarized light source and image display apparatus using the same |
| US7312285B2 (en) | 2002-07-10 | 2007-12-25 | Lg Chem, Ltd. | Method for preparing norbornene based addition polymer containing ester or acetyl functional group |
| KR100862239B1 (en) * | 2002-07-10 | 2008-10-09 | 엘지디스플레이 주식회사 | Liquid crystal display device with a cholesteric liquid crystal polarizer |
| KR100618153B1 (en) | 2003-02-06 | 2006-08-29 | 주식회사 엘지화학 | Protective film of polarizar,polarizing plate and method for preparing the same |
| KR100676886B1 (en) * | 2005-02-24 | 2007-02-05 | 주식회사 엘지에스 | Reflection polarized light film and display device having the same |
| US20070091229A1 (en) * | 2005-06-09 | 2007-04-26 | Jang Soo J | Vertically aligned liquid crystal display |
| KR100803715B1 (en) * | 2007-01-24 | 2008-02-15 | 삼성정밀화학 주식회사 | Preparing method of prism-patterned broadband reflective polarizer |
| RU2570337C1 (en) * | 2014-10-14 | 2015-12-10 | Федеральное государственное бюджетное учреждение науки институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук | Scattering anisotropy-based light-polarising element |
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