JP2008158344A - Manufacturing method of liquid crystal display panel - Google Patents

Manufacturing method of liquid crystal display panel Download PDF

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JP2008158344A
JP2008158344A JP2006348264A JP2006348264A JP2008158344A JP 2008158344 A JP2008158344 A JP 2008158344A JP 2006348264 A JP2006348264 A JP 2006348264A JP 2006348264 A JP2006348264 A JP 2006348264A JP 2008158344 A JP2008158344 A JP 2008158344A
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liquid crystal
display
area
sealing material
substrates
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Hidefumi Yamashita
英文 山下
Osamu Sato
治 佐藤
Yoshinori Seihikari
義則 正光
Shino Lee
志瑙 李
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LG Display Co Ltd
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LG Display Co Ltd
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Priority to KR1020070052580A priority patent/KR20080059493A/en
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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
    • G02F1/1341—Filling or closing of cells
    • 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
    • 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
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • 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
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • 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
    • G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
    • 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
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a liquid crystal display panel with which liquid crystal leakage generated in a sealing step and the like after an ODF step when the liquid crystal display panel is manufactured and contamination due to elution of a sealing material to a liquid crystal are suppressed. <P>SOLUTION: The manufacturing method includes a step for preparing a pair of substrates 1a and 1b, a step for forming alignment layers 2a and 2b each composed of a highly wettable part 21 having a surface state of high wettability to a liquid crystal in a region of a display area A and low wettable part 22 having a surface state of low wettability as compared with the highly wettable part to the liquid crystal in a region of a display outer circumferential area B from the display area to an outer circumferential seal part on the pair of substrates, a step for forming a sealing material 4 on the seal part of a circumferential edge part of the display outer circumferential area of either one of the pair of substrates, a step for dropping the liquid crystal 3 on either one display area of the pair of substrates, a step for sticking the pair of substrates so that the sealing material and the liquid crystal may be faced on the inner side under a pressure lower than an atmospheric pressure and a step for curing the sealing material under low atmospheric pressure or after being opened to the atmosphere. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、液晶表示パネルの製造方法、特にＯＤＦ(One Drop Fill)工程後の封着工程中等における液晶の広がり速度の制御に関する。   The present invention relates to a method for manufacturing a liquid crystal display panel, and more particularly to control of a spread rate of liquid crystal during a sealing step after an ODF (One Drop Fill) step.

従来、小型パネルの製造では基板の配向処理、組立処理を完了後、バッチ処理にて液晶を注入する方式が主に用いられている。この際の液晶注入はＯＤＦ方式も適用可能である。   Conventionally, in the manufacture of small panels, a method of injecting liquid crystal by batch processing after completion of substrate alignment processing and assembly processing is mainly used. In this case, the ODF method can be applied to the liquid crystal injection.

しかしながら、小型パネルは大型パネルに比べ、表示エリアの面積が絶対的に小さく、液晶を滴下する場所から周辺シール材位置までの距離を確保できない。そのため、滴下した液晶がＯＤＦの工程中に広がり、シール材に接触し、シール材から液晶中への不純物の溶出が発生したり、液晶がシール材外部に漏れてしまう等の不具合が発生することがある。また、大型パネルでも、シール材硬化前に液晶がシールと接触するのを避けるため、液晶の滴下位置を周辺シール材から離れた表示エリア中央部付近に集中させることもある。   However, a small panel has an area of a display area that is absolutely smaller than that of a large panel, and cannot secure a distance from a location where liquid crystal is dropped to a peripheral sealing material position. For this reason, the dropped liquid crystal spreads during the ODF process, contacts the sealing material, and elution of impurities from the sealing material into the liquid crystal occurs, or the liquid crystal leaks to the outside of the sealing material. There is. Even in a large panel, the liquid crystal dripping position may be concentrated near the center of the display area away from the peripheral sealing material in order to avoid the liquid crystal from coming into contact with the seal before the sealing material is cured.

一方、液晶の注入時間を短縮することを目的として、一対の基板を貼り合わせて貼合せ基板を作製し、互いに異なる表面張力を有する複数種類の液晶を表面張力の大きい液晶から順に貼合せ基板内に注入し、注入された複数種類の液晶を貼合せ基板内で混合させるものがある(例えば下記特許文献１参照)。   On the other hand, for the purpose of shortening the injection time of liquid crystal, a pair of substrates are bonded together to produce a bonded substrate, and a plurality of types of liquid crystals having different surface tensions are arranged in order from the liquid crystal having the largest surface tension. And a plurality of types of injected liquid crystals are mixed in a bonded substrate (for example, see Patent Document 1 below).

特開２００４−６１６９０号公報JP 2004-61690 A

以上のように、特に小型パネルの製造においてＯＤＦ(滴下注入)方式にて液晶の注入を行う場合、通常、ホモジニアス配向させた配向膜ではポリイミド(ＰＩ)と液晶の濡れ性がよく液晶の広がる速度が速いため、シール材をＵＶ硬化させる前に液晶がシール材に接触し、シール材から不純物が溶出したり液晶がシール材外部に漏れてしまう等の不具合が発生するという課題があった。   As described above, especially when liquid crystal is injected by the ODF (drop injection) method in the manufacture of a small panel, normally, the alignment film with homogeneous alignment has good wettability between polyimide (PI) and liquid crystal, and the speed at which the liquid crystal spreads. Therefore, there is a problem that the liquid crystal comes into contact with the sealing material before the sealing material is UV-cured, and problems such as impurities are eluted from the sealing material and the liquid crystal leaks outside the sealing material.

この発明は、液晶表示パネル製造時のＯＤＦ工程後、シールを硬化させるまでの間に発生する液晶の漏れや液晶へのシール材の溶出による汚染を抑制した液晶表示パネルの製造方法を提供することを目的とする。   The present invention provides a method for manufacturing a liquid crystal display panel that suppresses contamination caused by leakage of liquid crystal and elution of a sealing material into the liquid crystal after the ODF process at the time of manufacturing the liquid crystal display panel and before the seal is cured. With the goal.

この発明は、一対の基板を準備する工程と、一対の基板にそれぞれ、表示エリアの領域が液晶に対する塗れ性が高い表面状態を有する高塗れ性部、表示エリアからその外周のシール部までの表示外周エリアの領域が液晶に対して前記高塗れ性部に比べて塗れ性が低い表面状態を有する低塗れ性部からなる配向膜を形成する工程と、一対の基板のいずれか一方の表示外周エリアの周縁部のシール部にシール材を形成する工程と、一対の基板のいずれか一方の表示エリアに液晶を滴下する工程と、大気圧より低い気圧下で前記シール材及び液晶が内側になるように一対の基板を貼り合わせる工程と、前記低気圧下又は大気開放後に前記シール材を硬化させる工程と、を備えたことを特徴とする液晶表示パネルの製造方法にある。   The present invention provides a step of preparing a pair of substrates, a highly paintable portion having a surface state in which a region of the display area has a high paintability to liquid crystal, and a display from the display area to the outer peripheral seal portion. A step of forming an alignment film composed of a low-coatability portion having a surface state in which an outer peripheral area has a lower coatability than the high-coatability portion with respect to the liquid crystal; A step of forming a sealing material on the sealing portion at the periphery of the liquid crystal, a step of dropping liquid crystal on one of the display areas of the pair of substrates, and the sealing material and the liquid crystal facing inside at a pressure lower than atmospheric pressure. A method for manufacturing a liquid crystal display panel, comprising: a step of bonding a pair of substrates to each other; and a step of curing the sealing material under the low pressure or after being released to the atmosphere.

この発明においては、表示エリアの配向膜表面状態に対して、表示エリアとシール材の間の配向膜表面状態を異質にすることで液晶が広がるスピードを遅くさせ、液晶の漏れや液晶へのシール材の溶出による汚染を抑制できる。   In the present invention, the alignment film surface state between the display area and the sealing material is made different from the alignment film surface state in the display area, so that the speed at which the liquid crystal spreads is slowed down. Contamination due to material elution can be suppressed.

以下、この発明について説明する。まず、液晶の広がりは液晶の表面張力、配向膜と液晶の濡れ性、外圧、滴下する液晶量(ガラスの歪による応力)、ＯＤＦプロセス中の真空度などにより決まる。通常、滴下する液晶量やプロセス中の真空度は、製品仕様上の観点からほぼ一定に保たれている。   The present invention will be described below. First, the spread of the liquid crystal is determined by the surface tension of the liquid crystal, the wettability between the alignment film and the liquid crystal, the external pressure, the amount of liquid crystal to be dropped (stress due to glass distortion), the degree of vacuum during the ODF process, and the like. Usually, the amount of liquid crystal to be dropped and the degree of vacuum during the process are kept almost constant from the viewpoint of product specifications.

図１に液晶注入工程中の液晶の状態を模式した断面図を示す。１ａ、１ｂは一方が表示制御部品としてデータラインやゲートライン等の信号配線、データラインとゲートラインとの交差部のＴＦＴやピクセル電極等(共に図示省略)を形成したＴＦＴ−アレイ基板、他方が表示制御部品としてカラーフィルタ、共通電極、ブラックマトリックス等(共に図示省略)を形成したカラーフィルタ基板からなる一対のそれぞれガラス基板からなる第１基板と第２基板、２ａ，２ｂはこれらの第１基板１ａと第２基板１ｂに形成されたそれぞれの配向膜、３は液晶、４はシール材を示す。   FIG. 1 is a cross-sectional view schematically showing the state of the liquid crystal during the liquid crystal injection process. 1a and 1b, one is a TFT-array substrate on which a signal line such as a data line or a gate line is formed as a display control component, a TFT or pixel electrode (not shown) at the intersection of the data line and the gate line is formed, and the other is A first substrate and a second substrate made of a pair of glass substrates each formed of a color filter substrate on which a color filter, a common electrode, a black matrix, etc. (both not shown) are formed as display control components are the first substrate. Alignment films formed on 1a and the second substrate 1b, 3 is a liquid crystal, and 4 is a sealing material.

液晶３は図１の左側に滴下され、真空チャンバ(図示省略)での大気開放時の圧力差および各種張力の影響により、図１の左側より右側に広がっていく。ここで、γｗは液晶３の表面張力、例えばγｗｓは液晶３と配向膜２ａ界面の張力、γｓは配向膜２ａの表面張力、θは液晶３の配向膜２ａに対する接触角を示している(配向膜２ｂ側も同様)。また液晶３の圧力をＰＬＣ、液晶が広がっていない領域の圧力をＰｅとし、Ｐｅは真空チャンバ内で真空状態を理想とする大気圧より低い低気圧下(以下単に真空状態と記す)で両基板１ａ，１ｂが貼り合わされるためほぼ真空に近い値となっている。 The liquid crystal 3 is dropped on the left side of FIG. 1 and spreads from the left side of FIG. 1 to the right side due to the influence of pressure difference and various tensions when the vacuum chamber (not shown) is opened to the atmosphere. Here, γw is the surface tension of the liquid crystal 3, for example, γws is the tension at the interface between the liquid crystal 3 and the alignment film 2a, γs is the surface tension of the alignment film 2a, and θ is the contact angle of the liquid crystal 3 with respect to the alignment film 2a (alignment). The same applies to the membrane 2b side). The pressure P LC of the liquid crystal 3, a liquid crystal is a have not area pressure P e of the spread, P e is (referred to hereinafter simply vacuum) atmospheric lower pressure cyclones under which the ideal vacuum conditions within the vacuum chamber Thus, since both the substrates 1a and 1b are bonded together, the value is almost a vacuum.

液晶表示パネルが真空チャンバ内で大気開放された状態においては、上記張力は下記の式(１)のような関係が成り立っている。   In a state where the liquid crystal display panel is opened to the atmosphere in the vacuum chamber, the tension has a relationship represented by the following formula (1).

γｓ＝γｗｓ＋γｗｃｏｓθ (１)   γs = γws + γwcos θ (1)

つまり、液晶３の広がるスピードは、液晶３の圧力をＰＬＣや液晶が広がっていない領域の圧力をＰｅ以外に、γｓの影響を受ける。従って液晶３の表面張力γｗや液晶と配向膜２ａ界面の張力γｗｓ、及び接触角θによっても液晶３の移動スピードは変化する。 In other words, the speed of extension of the liquid crystal 3, the pressure of the liquid crystal 3 the pressure in the region not widened P LC or liquid crystal in addition to P e, are affected by gamma] s. Accordingly, the moving speed of the liquid crystal 3 also varies depending on the surface tension γw of the liquid crystal 3, the tension γws at the interface between the liquid crystal and the alignment film 2 a, and the contact angle θ.

以上の考察から、表示エリアと、表示エリアからその外周のシール材を塗布するシール部までの表示外周エリアの配向状態を変える、もしくは表示外周エリアの配向膜に特別な表面処理を施すことにより、表示外周エリアでの液晶３の広がる速度を遅くし、硬化前のシール材４からの液晶３中への不純物混入や液晶３がシール材４外部に漏れる現象を抑制または防止することができる。   From the above consideration, by changing the alignment state of the display outer area from the display area and the seal area to which the outer periphery sealing material is applied, or by applying a special surface treatment to the alignment film of the display outer area, The spreading speed of the liquid crystal 3 in the display outer peripheral area can be slowed to suppress or prevent impurities from being mixed into the liquid crystal 3 from the sealing material 4 before curing and the phenomenon that the liquid crystal 3 leaks to the outside of the sealing material 4.

一般にホモジニアス配向させた配向膜と液晶の接触角は、ホメオトロピック配向させた配向膜の接触角と比較して小さく、濡れ性が良いことが知られている。そこで、例えば図２に示すように、ホモジニアス配向させる配向膜を使用する液晶表示パネル(たとえば、ＩＰＳ(In-Plane Switching)やＴＮ(Twisted Nematic))の場合、表示エリアＡをホモジニアス配向する配向膜とし、配向処理(たとえばラビング)を行った後、ホメオトロピック配向する配向膜を表示外周エリアＢに塗布することにより、表示エリアＡは望む特性を得ながら、表示外周エリアＢの液晶の広がる速度を遅くし、液晶がシール材と接触し、硬化前のシール材からの液晶への不純物の混入や液晶がシール材外部に漏れ出る現象をなくすことができる。   It is generally known that the contact angle between a homogeneously aligned alignment film and a liquid crystal is smaller than the contact angle of a homeotropically aligned alignment film and has good wettability. Therefore, for example, as shown in FIG. 2, in the case of a liquid crystal display panel (for example, IPS (In-Plane Switching) or TN (Twisted Nematic)) using an alignment film for homogeneous alignment, an alignment film for homogeneously aligning the display area A After applying an alignment treatment (for example, rubbing), a display film A is obtained by applying a homeotropically oriented alignment film to the display outer peripheral area B. It is possible to eliminate the phenomenon that the liquid crystal comes into contact with the sealing material and impurities are mixed into the liquid crystal from the unsealed sealing material and the liquid crystal leaks out of the sealing material.

その他、表示外周エリアＢの配向膜の表面に液晶の濡れ性を悪くするような表面処理することによっても、同様の効果を得ることができる。   In addition, the same effect can be obtained by subjecting the surface of the alignment film in the display outer peripheral area B to a surface treatment that makes liquid crystal wettability worse.

実施の形態１．
図３〜図８はこの発明の一実施の形態による液晶表示パネルの製造方法の手順を概略的に示した断面図である。なお図３〜図８は液晶表示パネル１つ分を示したもので、一般には、複数個分の大きさの基板で同時に複数の液晶表示パネルを製造して後で分離する。以下これに従って概略的に製造手順を説明する。 Embodiment 1 FIG.
3 to 8 are cross-sectional views schematically showing a procedure of a method of manufacturing a liquid crystal display panel according to one embodiment of the present invention. 3 to 8 show one liquid crystal display panel. In general, a plurality of liquid crystal display panels are manufactured simultaneously on a plurality of substrates and separated later. The manufacturing procedure will be schematically described below according to this.

最初に図１に示すように、一方が表示制御部品として例えばデータラインやゲートライン等の信号配線、データラインとゲートラインとの交差部のＴＦＴやピクセル電極等(共に図示省略)を形成したＴＦＴ−アレイ基板、他方が表示制御部品として例えばカラーフィルタ、共通電極、ブラックマトリックス等(共に図示省略)を形成したカラーフィルタ基板からなる一対のそれぞれガラス基板からなる第１基板１ａと第２基板１ｂを準備する。なお、第１基板１ａ及び第２基板１ｂに形成されている表示制御部品は上記のものに限定されるものではい。   First, as shown in FIG. 1, one of the display control components is formed with, for example, signal lines such as data lines and gate lines, TFTs at the intersections of the data lines and gate lines, pixel electrodes and the like (both not shown). A first substrate 1a and a second substrate 1b made of a pair of glass substrates each made of a color filter substrate on which an array substrate, for example, a color filter, a common electrode, a black matrix, etc. (both not shown) are formed as display control components. prepare. The display control components formed on the first substrate 1a and the second substrate 1b are not limited to the above.

そして図４に示すように、第１基板１ａと第２基板１ｂにそれぞれ配向膜２ａ，２ｂを形成する。配向膜２ａ，２ｂはそれぞれ、表示エリアＡの領域の、液晶３に対する塗れ性が高い表面状態を有する高塗れ性部２１、表示外周エリアＢの領域の、液晶３に対して高塗れ性部２１に比べて塗れ性が低い低塗れ性部２２からなる。   Then, as shown in FIG. 4, alignment films 2a and 2b are formed on the first substrate 1a and the second substrate 1b, respectively. Each of the alignment films 2a and 2b has a highly paintable portion 21 having a surface state in which the area of the display area A has high wettability with respect to the liquid crystal 3, and a highly wettable portion 21 with respect to the liquid crystal 3 in the area of the display outer peripheral area B. It consists of the low paintability part 22 with low paintability compared with.

そして図５に示すように、例えば第１基板１ａの配向膜２ａ上の表示外周エリアＢの周縁部であるシール部に、例えば紫外線硬化型のシール材４を塗布する。そして配向膜２ａ上の表示エリアＡには液晶３を滴下注入する。なお、シール材４の塗布と液晶３の滴下は第１基板１ａと第２基板１ｂのいずれに行ってもよく、またシール材４の塗布と液晶３の滴下を別々の基板に行ってもよい。   Then, as shown in FIG. 5, for example, an ultraviolet curable sealant 4 is applied to a seal portion that is a peripheral portion of the display outer peripheral area B on the alignment film 2a of the first substrate 1a. Then, the liquid crystal 3 is dropped and injected into the display area A on the alignment film 2a. The application of the sealing material 4 and the dropping of the liquid crystal 3 may be performed on either the first substrate 1a or the second substrate 1b, and the application of the sealing material 4 and the dropping of the liquid crystal 3 may be performed on separate substrates. .

そして図６に示すように、第１基板１ａと第２基板１ｂを真空チャンバ１０内に入れてチャンバ内を真空にする。   Then, as shown in FIG. 6, the first substrate 1a and the second substrate 1b are put in the vacuum chamber 10 to make the inside of the chamber a vacuum.

そして図７に示すように、第１基板１ａと第２基板１ｂをシール材４と液晶３が内側になるように貼り合わせる。この時、第１基板１ａと第２基板１ｂの間には図示は省略したがスペーサが設けられている。これにより液晶３は、張り合わされた第１基板１ａと第２基板１ｂの間の隙間に拡がる。この際、上述のように表示外周エリアＢでは配向膜２ａ，２ｂが低塗れ性部２２になっているため、液晶３の拡がる速度が遅くなり、すぐにはシール材４に到達せず、真空部５(実際には真空に近い圧力部分)が発生する。   Then, as shown in FIG. 7, the first substrate 1a and the second substrate 1b are bonded together so that the sealing material 4 and the liquid crystal 3 are inside. At this time, although not shown, a spacer is provided between the first substrate 1a and the second substrate 1b. As a result, the liquid crystal 3 spreads in the gap between the bonded first substrate 1a and second substrate 1b. At this time, since the alignment films 2a and 2b are the low-paintability portions 22 in the display outer peripheral area B as described above, the speed at which the liquid crystal 3 spreads is slowed down and does not reach the sealing material 4 immediately, and vacuum Part 5 (actually a pressure part close to a vacuum) is generated.

そしてこの状態でシール材４にＵＶ光を照射して硬化させて封着し、その後、真空チャンバ１０を大気開放することで、液晶３は圧力差により図８に示すように真空部５を埋めてシール材４に到達し、第１基板１ａと第２基板１ｂの間の隙間に完全に充填される。なお、シール材４の硬化は、真空チャンバ１０の大気開放後であってもよい。   In this state, the sealing material 4 is irradiated with UV light to be cured and sealed, and then the vacuum chamber 10 is opened to the atmosphere so that the liquid crystal 3 fills the vacuum portion 5 as shown in FIG. Thus, the sealing material 4 is reached and the gap between the first substrate 1a and the second substrate 1b is completely filled. The sealing material 4 may be cured after the vacuum chamber 10 is opened to the atmosphere.

このように、液晶３がシール材４に到達、接触する時間を遅らせることで、硬化前のシール材４から液晶３中への不純物混入や液晶３がシール材４外部に漏れる現象を抑制または防止することができる。   In this way, by delaying the time for the liquid crystal 3 to reach and contact the sealing material 4, the mixing of impurities from the sealing material 4 before curing into the liquid crystal 3 and the phenomenon of the liquid crystal 3 leaking to the outside of the sealing material 4 are suppressed or prevented. can do.

以下に、第１基板１ａと第２基板１ｂに高塗れ性部２１と低塗れ性部２２を形成する実施例を説明する。第１実施例として、図４に示す配向膜２ａ，２ｂ形成の際、すでに述べたように、マスク処理を利用して、最初に表示エリアＡの領域に、ラビングによる配向処理によりホモジニアス配向の配向特性となる配向膜を塗布してラビングを行い、次に、表示外周エリアＢの領域にホメオトロピック配向の配向特性を有する配向膜を塗布する。また、表示エリアＡ及び表示外周エリアＢを含む全領域に、ホモジニアス配向の配向特性となる配向膜を塗布してラビングを行い、次に、表示外周エリアＢの領域だけにホメオトロピック配向の配向特性を有する配向膜を塗布してもよい。   Below, the Example which forms the highly paintable part 21 and the low paintability part 22 in the 1st board | substrate 1a and the 2nd board | substrate 1b is described. As the first embodiment, when the alignment films 2a and 2b shown in FIG. 4 are formed, the alignment of the homogeneous alignment is first applied to the area of the display area A by the alignment process by rubbing using the mask process as described above. An alignment film having characteristics is applied and rubbed, and then an alignment film having an alignment characteristic of homeotropic alignment is applied to the region of the display outer peripheral area B. In addition, an alignment film having homogeneous alignment characteristics is applied to the entire area including the display area A and the display outer peripheral area B, followed by rubbing. Next, only the area of the display outer peripheral area B is aligned with the homeotropic alignment characteristics. An alignment film having the following may be applied.

また、第２実施例として、図４に示す配向膜２ａ，２ｂ形成の際、最初に表示エリアＡ及び表示外周エリアＢを含む全領域に、配向膜を塗布してラビングを行う。次に、マスクを利用して、表示外周エリアＢの領域だけＵＶ光を照射するＵＶ処理を施す。配向膜にＵＶ処理を施すと一旦、塗れ性の目安となる接触角θが小さくなるが照射量を増大(例えば数千〜数万ｍＪ／ｃｍ２)させると接触角θは高くなる。 As the second embodiment, when the alignment films 2a and 2b shown in FIG. 4 are formed, the alignment film is first applied to the entire region including the display area A and the display outer peripheral area B and rubbed. Next, using the mask, UV processing is performed in which UV light is irradiated only to the display outer peripheral area B. When the alignment film is subjected to UV treatment, the contact angle θ, which is a measure of paintability, once decreases. However, when the dose is increased (for example, several thousand to several tens of thousands mJ / cm 2 ), the contact angle θ increases.

なお、シール材４はＵＶ硬化型に限定されず、他の種類の光により硬化する光硬化型のものであればよい。   The sealing material 4 is not limited to the UV curable type, and may be a photo curable type that is cured by other kinds of light.

液晶注入工程中の液晶の状態を模式した断面図である。It is sectional drawing which modeled the state of the liquid crystal in a liquid crystal injection process. この発明の一実施の形態による液晶表示パネルの製造方法における配向膜の形成方法を説明するための図である。It is a figure for demonstrating the formation method of the orientation film in the manufacturing method of the liquid crystal display panel by one Embodiment of this invention. この発明の一実施の形態による液晶表示パネルの製造方法の手順を説明するための断面図である。It is sectional drawing for demonstrating the procedure of the manufacturing method of the liquid crystal display panel by one Embodiment of this invention. 図３に続く液晶表示パネルの製造工程を示す断面図である。FIG. 4 is a cross-sectional view showing a manufacturing process of the liquid crystal display panel following FIG. 3. 図４に続く液晶表示パネルの製造工程を示す断面図である。FIG. 5 is a cross-sectional view showing a manufacturing process of the liquid crystal display panel following FIG. 4. 図５に続く液晶表示パネルの製造工程を示す断面図である。FIG. 6 is a cross-sectional view showing a manufacturing process of the liquid crystal display panel following FIG. 5. 図６に続く液晶表示パネルの製造工程を示す断面図である。FIG. 7 is a cross-sectional view showing a manufacturing process of the liquid crystal display panel continued from FIG. 6. 図７に続く液晶パネルセルの製造工程を示す断面図である。FIG. 8 is a cross-sectional view showing a manufacturing step of the liquid crystal panel cell following FIG. 7.

符号の説明Explanation of symbols

１ａ 第１基板、１ｂ 第２基板、２ａ，２ｂ 配向膜、３ 液晶、４ シール材、５ 真空部、１０ 真空チャンバ、２１ 高塗れ性部、２２ 低塗れ性部、Ａ 表示エリア、Ｂ 表示外周エリア、θ 接触角。   DESCRIPTION OF SYMBOLS 1a 1st board | substrate, 1b 2nd board | substrate, 2a, 2b alignment film, 3 liquid crystal, 4 sealing material, 5 vacuum part, 10 vacuum chamber, 21 high paintability part, 22 low paintability part, A display area, B display outer periphery Area, θ Contact angle.

Claims (3)

一対の基板を準備する工程と、
一対の基板にそれぞれ、表示エリアの領域が液晶に対する塗れ性が高い表面状態を有する高塗れ性部、表示エリアからその外周のシール部までの表示外周エリアの領域が液晶に対して前記高塗れ性部に比べて塗れ性が低い表面状態を有する低塗れ性部からなる配向膜を形成する工程と、
一対の基板のいずれか一方の表示外周エリアの周縁部のシール部にシール材を形成する工程と、
一対の基板のいずれか一方の表示エリアに液晶を滴下する工程と、
大気圧より低い気圧下で前記シール材及び液晶が内側になるように一対の基板を貼り合わせる工程と、
前記低気圧下又は大気開放後に前記シール材を硬化させる工程と、
を備えたことを特徴とする液晶表示パネルの製造方法。 Preparing a pair of substrates;
Each of the pair of substrates has a highly paintable portion having a surface state in which the area of the display area is highly paintable to the liquid crystal, and the region of the display outer peripheral area from the display area to the seal portion on the outer periphery of the liquid crystal Forming an alignment film composed of a low wettability part having a surface state having low wettability compared to the part;
Forming a sealing material on the seal portion at the peripheral edge of the display outer peripheral area of either one of the pair of substrates;
Dropping a liquid crystal on a display area of one of the pair of substrates;
A step of bonding a pair of substrates so that the sealing material and the liquid crystal are inside at a pressure lower than atmospheric pressure;
Curing the sealing material under the low pressure or after opening to the atmosphere;
A method of manufacturing a liquid crystal display panel, comprising: 配向膜を形成する工程において、各基板について、
表示エリアの領域又は表示エリア及び表示外周エリアを含む全領域に、ラビングによる配向処理によりホモジニアス配向の配向特性となる配向膜を塗布してラビングを行い、
次に、表示外周エリアの領域に、ホメオトロピック配向の配向特性を有する配向膜を塗布する、
ことを特徴とする請求項１に記載の液晶表示パネルの製造方法。 In the step of forming the alignment film, for each substrate,
Rubbing is performed by applying an alignment film that becomes an alignment characteristic of homogeneous alignment by alignment processing by rubbing on the entire area including the display area or the display area and the display outer peripheral area,
Next, an alignment film having homeotropic alignment characteristics is applied to the display outer peripheral area.
The method of manufacturing a liquid crystal display panel according to claim 1. 配向膜を形成する工程において、各基板について、
表示エリア及び表示外周エリアを含む全領域に、配向膜を塗布してラビングを行い、
表示外周エリアの領域だけにＵＶ光を所定量照射するＵＶ処理を施す、
ことを特徴とする請求項１に記載の液晶表示パネルの製造方法。 In the step of forming the alignment film, for each substrate,
Apply an alignment film to the entire area including the display area and the display outer peripheral area, and perform rubbing.
Apply UV treatment to irradiate a predetermined amount of UV light only to the display outer peripheral area,
The method of manufacturing a liquid crystal display panel according to claim 1.
JP2006348264A 2006-12-25 2006-12-25 Manufacturing method of liquid crystal display panel Pending JP2008158344A (en)

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JP2009031774A (en) * 2007-06-26 2009-02-12 Semiconductor Energy Lab Co Ltd Liquid crystal display device and method for manufacturing the same
JP2011145535A (en) * 2010-01-15 2011-07-28 Hitachi Displays Ltd Liquid crystal display device and manufacturing method thereof
JP2011175214A (en) * 2010-02-25 2011-09-08 Seiko Instruments Inc Method of manufacturing display device
JP2012123264A (en) * 2010-12-09 2012-06-28 Mitsubishi Electric Corp Liquid crystal display device and manufacturing method for the same
TWI427320B (en) * 2009-03-17 2014-02-21 Innolux Corp Tunable wettability film and display apparatus
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Publication number Priority date Publication date Assignee Title
JP2009031774A (en) * 2007-06-26 2009-02-12 Semiconductor Energy Lab Co Ltd Liquid crystal display device and method for manufacturing the same
US8659730B2 (en) 2007-06-26 2014-02-25 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device comprising a first orientation film and a second orientation film surrounding the first orientation film wherein a side surface and a top surface of the first orientation film are in contact with the second orientation film
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JP2011145535A (en) * 2010-01-15 2011-07-28 Hitachi Displays Ltd Liquid crystal display device and manufacturing method thereof
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JP2012123264A (en) * 2010-12-09 2012-06-28 Mitsubishi Electric Corp Liquid crystal display device and manufacturing method for the same
CN103605240A (en) * 2013-11-21 2014-02-26 深圳市华星光电技术有限公司 Liquid crystal coating method and method for manufacturing liquid crystal display panel
WO2015074336A1 (en) * 2013-11-21 2015-05-28 深圳市华星光电技术有限公司 Liquid crystal coating method and method for manufacturing liquid crystal display panel

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