WO2015174573A1 - Dispositif d'affichage à cristaux liquides à commande d'énergie d'ancrage de surface, son procédé de fabrication et son dispositif de fabrication - Google Patents

Dispositif d'affichage à cristaux liquides à commande d'énergie d'ancrage de surface, son procédé de fabrication et son dispositif de fabrication Download PDF

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Publication number
WO2015174573A1
WO2015174573A1 PCT/KR2014/005112 KR2014005112W WO2015174573A1 WO 2015174573 A1 WO2015174573 A1 WO 2015174573A1 KR 2014005112 W KR2014005112 W KR 2014005112W WO 2015174573 A1 WO2015174573 A1 WO 2015174573A1
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Prior art keywords
wavelength band
liquid crystal
photo
alignment
irradiation
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PCT/KR2014/005112
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English (en)
Korean (ko)
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이기동
문병준
조정호
박기웅
백승민
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동아대학교 산학협력단
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Publication of WO2015174573A1 publication Critical patent/WO2015174573A1/fr

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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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

Definitions

  • the present invention relates to a liquid crystal display device. Specifically, surface alignment is achieved by mixing a photo alignment agent and a reactive mesogen (RM) to induce a polymerization reaction of alignment and RM using only a UV wavelength to control surface fixation energy.
  • a liquid crystal display device capable of energy control, a method of manufacturing the same, and a manufacturing apparatus therefor.
  • a liquid crystal display includes a liquid crystal layer having regularly oriented molecules and a liquid crystal alignment film for aligning such liquid crystals is formed from a polymer material.
  • a liquid crystal alignment film is prepared by rubbing a process, ie, rubbing fibers such as nylon or rayon with a polymer film.
  • a method of orienting a mixture of polyimide (PI) and RM on a substrate and a method of stacking PI and RM, respectively, as shown in FIG. 2, are representative methods for increasing surface fixation energy.
  • the rubbing process is a method of inducing orientation by direct friction with cloth or fiber, and dust or static electricity are generated to cause loss of electro-optical properties of the liquid crystal display.
  • the present invention is to solve the problems of the liquid crystal display device of the prior art, by mixing a photo alignment agent (RM) (Reactive Mesogen) and induction of the orientation and polymerization of the RM only by UV wavelength surface fixed energy It is an object of the present invention to provide a liquid crystal display device capable of controlling surface fixed energy so as to be controlled, a method of manufacturing the same, and a manufacturing device therefor.
  • RM photo alignment agent
  • the present invention enables the formation of photo-alignment and polymer network by irradiating UV reacting to each material by using the UV alignment wavelengths of the photo-alignment agent and RM + photoinitiator do not overlap, thereby increasing the efficiency and reproducibility of the manufacturing process.
  • An object of the present invention is to provide a liquid crystal display device and a method of manufacturing the same, and a method for manufacturing the same, which can control the surface fixed energy to improve the operation characteristics of the device through a process.
  • the present invention enables the formation of optical alignment and polymer networks by selectively using UV light having only a specific wavelength band even when the reaction wavelength bands of materials overlap, thereby improving the efficiency and reproducibility of the manufacturing process, thereby improving the operation characteristics of the device.
  • An object of the present invention is to provide a liquid crystal display, a method of manufacturing the same, and a manufacturing apparatus for the same, capable of controlling the surface fixed energy so as to be improved.
  • the present invention can improve the efficiency and reproducibility of the manufacturing process by using a filter for UV wavelength separation even if the reaction wavelength bands of materials overlap, thereby improving the operational characteristics of the device in an easy process. It is an object of the present invention to provide a liquid crystal display device capable of controlling the surface fixed energy, a method of manufacturing the same, and a manufacturing device therefor.
  • a liquid crystal display device capable of controlling surface fixation energy is formed by mixing a photoalignment agent, a reactive mesogen (RM), and a photoinitiator on a first substrate, A first surface fixed energy control mixed layer in which photoalignment is performed and a polymer network is formed by UV irradiation in a second wavelength band to control surface fixation energy; a photoalignment agent, a reactive mesogen (RM), and a photoinitiator on a second substrate A second surface fixed energy control mixed layer having mixed and formed, photo-alignment by UV irradiation in a first wavelength band, and a polymer network being formed by UV irradiation in a second wavelength band to control surface fixed energy; And a liquid crystal layer positioned between the first substrate and the second substrate.
  • the first wavelength band is 300nm ⁇ 365nm
  • the second wavelength band is characterized in that 200nm ⁇ 254nm.
  • the UV irradiation of the first wavelength band for photo-alignment and the UV irradiation of the second wavelength band for forming the polymer network are equally irradiated with UV in the 250 nm to 450 nm wavelength band, and specified in the UV irradiation step of any one wavelength band. It is characterized by advancing in a state where a filter for passing or blocking UV in a wavelength band is laminated therebetween.
  • d is the cell gap
  • p is the pitch
  • Real twisted angle is the pitch
  • Liquid crystal alignment angle It is characterized by the torsion constant of the liquid crystal.
  • a method of manufacturing a liquid crystal display device capable of controlling surface fixed energy including: preparing a lower substrate and an upper substrate; preparing a photoalignment agent + reactive meogen (RM) + photoinitiator mixture; Coating the mixture on a substrate, and performing soft baking and hard baking to form an optical polyimide layer; irradiating UV in a first polarized wavelength band for photoalignment; Injecting and annealing; Irradiating the UV of the second wavelength band to form a polymer network; characterized in that it comprises a.
  • RM reactive meogen
  • photo-alignment agent + RM (Reactive Meogen) + photoinitiator mixture is characterized in that prepared in 95.7: 0.05: 4.2wt%.
  • the first wavelength band is 300nm to 365nm to which the photo-alignment agent reacts
  • the second wavelength band is 200nm to 254nm to which the reactive meogen (RM) + photoinitiator reacts.
  • the UV irradiation step of any one of the wavelength bands is performed in a state in which a filter for passing or blocking the UV of a specific wavelength band is laminated therebetween.
  • soft baking is performed for 2 minutes at a temperature of 100 °C
  • hard baking is characterized in that for 1 hour at a temperature of 180 °C.
  • a manufacturing apparatus of a liquid crystal display device capable of controlling surface fixation energy according to the present invention, including: a mixing treatment unit for manufacturing a photoalignment + reactive meogen (RM) + photoinitiator mixture; A baking treatment unit for performing soft baking and hard baking; an optical alignment UV irradiation unit for irradiating linearly polarized UV light of a first wavelength band in which only the optical alignment agent reacts; injecting liquid crystal by bonding the aligned substrate, and ordering the injected liquid crystal Liquid crystal injection and annealing annealing (annealing) to increase the ordering (polymer network forming UV irradiation unit for irradiating the UV of the second wavelength band to which the RM + photoinitiator reacts to form a polymer network; characterized in that it comprises a.
  • Such a liquid crystal display and a manufacturing method and a manufacturing apparatus therefor capable of controlling the surface fixed energy according to the present invention has the following effects.
  • surface alignment energy can be controlled by mixing photo alignment and reactive mesogen (RM) to induce alignment and polymerization of RM using only UV wavelength.
  • the response speed can be improved by increasing the weak surface fixation energy of the photo-alignment agent using RM, and thus it is applicable to various liquid crystal display devices requiring high transmittance and fast response speed.
  • 1 and 2 is a configuration diagram showing a method of orienting a mixture of Polyimide (PI) and RM of the prior art on a substrate and a method of stacking PI and RM, respectively
  • FIG 3 is a cross-sectional view of a liquid crystal display device capable of controlling surface fixed energy according to the present invention.
  • FIG. 6 is a block diagram showing a manufacturing process using UV selective irradiation of the liquid crystal display according to the present invention
  • FIG. 7 is a flowchart illustrating a manufacturing process of a liquid crystal display device capable of controlling surface fixed energy according to the present invention.
  • FIG. 8 is a cross-sectional view of a manufacturing process of a liquid crystal display capable of controlling surface fixed energy according to the present invention.
  • FIG. 9 is a configuration diagram of an apparatus for manufacturing a liquid crystal display device capable of controlling surface fixed energy according to the present invention.
  • liquid crystal display capable of controlling surface fixed energy according to the present invention, a manufacturing method thereof, and a preferred embodiment of the manufacturing apparatus therefor will be described in detail.
  • liquid crystal display device and the method for manufacturing the surface-fixed energy control according to the present invention and the manufacturing apparatus therefor will be apparent from the detailed description of each embodiment below.
  • FIG 3 is a cross-sectional view of a liquid crystal display device capable of controlling surface fixed energy according to the present invention.
  • FIGS. 4 and 5 are configuration diagrams showing the reaction state according to the use of the UV filter
  • Figure 6 is a configuration diagram showing the manufacturing process using the UV selective irradiation of the liquid crystal display according to the present invention.
  • the present invention is to mix the photo alignment agent (RM) and reactive methogen (RM) to induce the polymerization reaction of the orientation and RM only by UV wavelength to control the surface fixation energy, UV reaction of the photo-alignment agent and RM + photoinitiator It is to perform photo-alignment and polymer formation by irradiating UV reacting to each material by using the overlapping wavelength range.
  • the present invention enables the simultaneous formation of a photonic alignment and a polymer network of RMs in one pixel using wavelength bands of different UVs.
  • the liquid crystal display device has a form having a pattern electrode as an example, but the structure and method for improving the surface fixation energy using the photoalignment agent and the RM mixture according to the present invention are not limited to any one specific liquid crystal mode, but the photoalignment agent Naturally, it can be applied to various liquid crystal modes according to the characteristics (horizontal photoalignment agent, vertical photoalignment agent).
  • a photo alignment agent, a reactive alignment agent (RM), and a photoinitiator are formed on the first substrate 60 having the pattern electrode 50.
  • the first surface fixed energy control mixed layer 40 and the second substrate 10 in which photo-alignment is performed by UV irradiation in one wavelength band, and a polymer network is formed by UV irradiation in a second wavelength band, thereby controlling surface fixed energy.
  • a second surface fixed energy control mixed layer 20 in which surface fixed energy is controlled, and a liquid crystal layer 30 positioned between the first substrate 60 and the second substrate 10 facing each other.
  • the first surface fixed energy control mixed layer 40 and the second surface fixed energy control mixed layer 20 are formed by separating the appropriate wavelength band and irradiating UV by using the photoaligning agent and the UV absorption wavelength band of the RM that are different from each other.
  • the surface fixing energy of) is increased to improve the response speed.
  • the wavelength band of the photo-alignment agent used in one embodiment of the present invention is 300nm, the photoinitiator is 200nm.
  • photo-alignment and polymer are separated by separating UV reaction wavelength band of photo-alignment agent and reactive mesogen (RM). Network formation is done within one pixel.
  • Such a wavelength band is given as an example, and is not limited to the above numerical values, and it is natural that the UV reaction wavelength band of the photoalignment agent and the RM + photoinitiator may be used in various ways depending on the material used.
  • 4 and 5 are configuration diagrams showing the reaction state according to the use of the UV filter.
  • UV filter that passes or blocks the UV of a specific wavelength band
  • photo-alignment is achieved by UV irradiation of the first wavelength band, UV of the second wavelength band It can be seen that the polymer network is formed by irradiation to control the surface fixation energy.
  • the optical alignment and the formation of the polymer network are described based on the material properties and the UV wavelength range.
  • the photo-alignment agent for irradiating UV of a high wavelength band and the RM + photoinitiator for irradiating UV of a somewhat lower wavelength band may be interchanged.
  • the polymer network is formed by the help of the photoinitiator instead of reacting with the UV itself. Therefore, when considering the reaction wavelength, the UV wavelength band is selected in consideration of the UV wavelength band of the photoinitiator.
  • the UV wavelength is distributed in a wide range (250 nm to 450 nm), it is possible to select the UV light having a specific wavelength band and perform photo-alignment and polymer formation even when the reaction wavelength bands of the materials overlap.
  • two different UV light sources with narrow wavelength bands are used to separate and irradiate the UV wavelength bands so that photo-alignment and formation of a polymer network can be carried out, or in the case of a UV light source with a broad wavelength band, Optical alignment and polymer network formation can be performed using a filter.
  • the use of the filter for UV wavelength separation is one example and is not limited to the use of the filter.
  • FIG. 6 is a block diagram illustrating a manufacturing process using UV selective irradiation of the liquid crystal display according to the present invention.
  • the linear UV polarizer and the long pass filter for UV linearly polarized light are placed on the mixed material layer formed on the lower substrate, and photo-alignment is performed by irradiating UV of 365nm.
  • UV of 254 nm is irradiated to increase surface fixation energy.
  • the manufacturing process of the liquid crystal display device capable of controlling the surface fixed energy according to the present invention is as follows.
  • FIG. 7 is a flowchart illustrating a process for manufacturing a surface fixed energy control device according to the present invention
  • FIG. 8 is a cross-sectional view illustrating a process for manufacturing a surface fixed energy control device according to the present invention.
  • liquid crystal display device having a pixel electrode line and a common electrode line has been described as an example.
  • the present invention can be applied to various liquid crystal modes depending on the characteristics of the photoalignment agent (horizontal photoalignment agent and vertical photoalignment agent).
  • a lower substrate and an upper substrate having a pixel electrode line and a common electrode line are prepared (S601), and a mixture of photo-alignment agent + Reactive Meogen (RM) + photoinitiator (95.7: 0.05: 4.2 wt%) is prepared (S602).
  • the prepared mixture is coated on a substrate and then soft baked for 2 minutes at a temperature of 100 ° C. (S603)
  • the irradiated UV light irradiates UV of the first wavelength band in which only the photoalignment agent reacts.
  • the process of irradiating UV by dividing the wavelength band may use the above-described filter or selectively use UV of the selected wavelength band according to the material properties.
  • an annealing process is performed at a temperature of 100 ° C. for 5 minutes (S607).
  • UV of the wavelength band where the RM + photoinitiator reacts is formed to form a polymer network.
  • the UV wavelength band, baking temperature, annealing temperature, and time to be irradiated in the liquid crystal display manufacturing process as described above are examples, and may be differently performed depending on the physical properties of the materials used and the pattern design form.
  • the manufacturing apparatus for manufacturing the liquid crystal display device capable of controlling the surface fixed energy according to the present invention will be described as follows.
  • FIG. 9 is a configuration diagram of an apparatus for manufacturing a liquid crystal display device capable of controlling surface fixed energy according to the present invention.
  • the apparatus for manufacturing a liquid crystal display device is a photo-alignment UV irradiation unit and a polymer network formation UV irradiation unit in order to irradiate UV in different wavelength bands in order to proceed with the photo-alignment and polymer network formation by irradiating UV wavelength bands separately It is provided.
  • composition consists of a mixing treatment unit 80 for preparing a mixture of photo-alignment agent + reactive meogen (RM) + photoinitiator (95.7: 0.05: 4.2wt%) and the prepared mixture on a substrate, followed by 2 minutes at a temperature of 100 ° C.
  • Soft baking and the baking treatment unit 81 for hard baking (Hard baking) for 1 hour at a temperature of 180 °C, and the linearly polarized UV of the first wavelength band to react only the photo-alignment agent
  • annealing is performed at a temperature of 100 ° C.
  • the photo-alignment UV irradiation unit 82 and the polymer network forming UV irradiation unit 84 has been described as an example of the separation configuration, but may be configured integrally when the wavelength band is separated using a filter.
  • the twist angle of the liquid crystal is measured to calculate the surface fixed energy.
  • chiral dopant materials are generally mixed in the liquid crystal.
  • the liquid crystals with the force to turn up to 48 ° by the Chiral dopant are suppressed when the surface fixation energy in the cell increases,
  • the liquid crystal twist state can be maintained.
  • the surface fixation energy may be calculated by determining how much the twist angle is formed based on the 30 ° alignment direction of the liquid crystal molecules.
  • the surface fixation energy is calculated as in Equation 1.
  • Such a liquid crystal display device and a method for manufacturing the surface fixed energy control according to the present invention and a manufacturing apparatus therefor are mixed with a photo alignment agent (RM) and a reactive mesogen (RM) to perform a polymerization reaction of the alignment and RM only by UV wavelength
  • a photo alignment agent RM
  • a reactive mesogen RM
  • the liquid crystal display device and method for manufacturing the surface-fixed energy control according to the present invention, and a manufacturing method therefor are mixed with a photo alignment agent (RM) and a reactive mesogen (RM) to induce a polymerization reaction of the alignment and RM by only the UV wavelength It is to control the surface fixed energy.
  • a photo alignment agent RM
  • a reactive mesogen RM

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides à commande d'énergie d'ancrage de surface capable de commander l'énergie d'ancrage de surface en mélangeant un agent de photo-alignement et un mésogène réactif (RM) pour induire l'alignement et la polymérisation du RM uniquement avec une longueur d'onde UV, son procédé de fabrication et son dispositif de fabrication, le dispositif d'affichage à cristaux liquides comprenant : une première couche de mélange de commande d'énergie d'ancrage de surface formée en mélangeant l'agent de photo-alignement, le RM et un photo-initiateur sur un premier substrat, en obtenant un photo-alignement par irradiation UV d'une première bande de longueur d'onde, et en commandant l'énergie d'ancrage de surface par la formation d'un réseau de polymères par irradiation UV d'une seconde bande de longueur d'onde ; une seconde couche de mélange de commande d'énergie d'ancrage de surface formée en mélangeant l'agent de photo-alignement, le RM et le photo-initiateur sur un second substrat, en obtenant un photo-alignement par irradiation UV de la première bande de longueur d'onde, et en commandant l'énergie d'ancrage de surface par la formation d'un réseau de polymères par irradiation UV de la seconde bande de longueur d'onde ; et une couche de cristaux liquides située entre le premier substrat et le second substrat qui se font face l'un à l'autre.
PCT/KR2014/005112 2014-05-14 2014-06-11 Dispositif d'affichage à cristaux liquides à commande d'énergie d'ancrage de surface, son procédé de fabrication et son dispositif de fabrication WO2015174573A1 (fr)

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Cited By (1)

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CN115220267A (zh) * 2022-08-01 2022-10-21 南京大学 一种液晶注液多孔光滑表面构建方法及其微流控应用

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KR20170136029A (ko) 2016-05-30 2017-12-11 삼성디스플레이 주식회사 액정 표시 장치 및 이의 제조 방법
KR102590072B1 (ko) * 2016-07-29 2023-10-16 롤릭 테크놀로지스 아게 액정 폴리머 재료의 상부에 정렬을 생성시키는 방법

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CN115220267B (zh) * 2022-08-01 2023-07-25 南京大学 一种液晶注液多孔光滑表面构建方法及其微流控应用

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