WO2013071663A1 - Tft-lcd用液晶配向膜的涂布方法 - Google Patents

Tft-lcd用液晶配向膜的涂布方法 Download PDF

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Publication number
WO2013071663A1
WO2013071663A1 PCT/CN2011/083715 CN2011083715W WO2013071663A1 WO 2013071663 A1 WO2013071663 A1 WO 2013071663A1 CN 2011083715 W CN2011083715 W CN 2011083715W WO 2013071663 A1 WO2013071663 A1 WO 2013071663A1
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Prior art keywords
film
tft
coating
alignment film
rectangular opening
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French (fr)
Inventor
朱美娜
赵建君
施翔尹
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/379,808 priority Critical patent/US8431426B1/en
Publication of WO2013071663A1 publication Critical patent/WO2013071663A1/zh
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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
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133723—Polyimide, polyamide-imide
    • 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
    • G02F1/133351—Manufacturing of individual cells out of a plurality of cells, e.g. by dicing

Definitions

  • the present invention relates to a manufacturing process of a liquid crystal display device, and more particularly to a coating process of a liquid crystal alignment film for LCD. Background technique
  • the PI (polyimide) film is a uniform alignment film on the surface of the TFT (Thin Film Transistor) and CF (Color Filter) substrate, which can align the liquid crystal molecules according to a certain pretilt angle, thereby controlling the passage of light.
  • TFT Thin Film Transistor
  • CF Color Filter
  • the coating process of PI film is currently mainly implemented in two ways: PI Roller Printing (Roller Coater) and PI Printing (Inkjet).
  • the transfer process generally includes: PI liquid is ejected from the PI nozzle 4, dropped on the rotating metal roller 3, and the excess PI liquid is scraped off by the scraper 5, and the metal roller 3 is rotated and stenciled. 6 contact, transfer the PI liquid to the printing plate 7 attached to the plate 6, and then contact the glass substrate 1 placed on the printing base 2 by the rotation of the plate 6 to transfer the PI liquid to the glass substrate. 1 on.
  • the process realization of the roller printing has the cumbersome equipment, low moving rate, large consumption of materials (Dummy substrate and printing plate), difficulty in film thickness adjustment, complicated operation, low usage rate of PI liquid, and high running cost. And shortcomings such as common defects caused by printing plate contamination.
  • the printing is performed by using the deformation of the piezoelectric ceramic to control the dropping of the PI liquid droplets 8 from the injection holes 9 to the glass substrate 1 disposed on the printing base 2, so that the liquid The droplets 8 are uniformly distributed on the glass substrate 1, and are diffused by the droplets 8 to form a uniform film.
  • the edge film thickness unevenness there is a large area of the edge film thickness unevenness, the nozzle hole is too small to be clogged, the difference between the nozzle holes 9 and the uneven diffusion, and the in-plane linear unevenness and the in-plane surface unevenness are serious, which is bad.
  • the biggest drawback of the method is that when the surface difference of the substrate is too large, the PI droplets 8 cannot be uniformly diffused and formed into a film at all, which leads to a drastic reduction in product quality or even a large amount of scrapping of the product.
  • printing by Inkjet due to the diffusion of droplets, it is easy to form a halo area as shown in Figure 4a and an edge wave as shown in Figure 4b, affecting the PI film. Quality.
  • US 20060172091 discloses a method for forming an alignment film by forming a hydrophobic film on a portion of a surface of a TFT substrate corresponding to a non-display region, and forming a hydrophilic film on a portion corresponding to the display region, by using a hydrophobic film.
  • the film defines the boundary of the hydrophilic film, and is printed by an inkjet method, and the alignment film material liquid is dropped to form an alignment film.
  • the Inkjet printing method in the region corresponding to the hydrophilic film is identical to the conventional process shown in FIG. 3, and although the surface difference of the substrate surface can be prevented to a certain extent, the droplets of the alignment film material cannot be diffused at all.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide a coating method for a liquid crystal alignment film for a TFT-LCD, which can reduce edge waves caused by printing an alignment film by an inkjet method, and effectively control an alignment film.
  • the printing precision of the film is to overcome the deficiencies of the prior art described above, and to provide a coating method for a liquid crystal alignment film for a TFT-LCD, which can reduce edge waves caused by printing an alignment film by an inkjet method, and effectively control an alignment film. The printing precision of the film.
  • the technical solution adopted by the present invention to solve the above technical problems includes a method for coating a liquid crystal alignment film for a TFT-LCD, comprising:
  • the hydrophobic film Forming a hydrophobic film on the TFT/CF substrate corresponding to the non-display area, the hydrophobic film separating the TFT/CF substrate into a plurality of rectangular opening areas separated from each other, each rectangular opening area corresponding to a display area and being a hydrophobic film constituting the outer frame thereof;
  • Coating of the alignment film material liquid is performed along the boundary of the rectangular opening region.
  • the coating method of the present invention further includes:
  • a hydrophilic film is formed in the rectangular opening region, and the coating of the alignment film material liquid is performed along the boundary between the hydrophilic film and the hydrophobic film.
  • the hydrophilic film is made thicker than the hydrophobic film.
  • the coating of the alignment film material liquid is effected by continuous line spraying.
  • the hydrophobic film is formed by coating a layer of a hydrophobic polymer on a corresponding non-display area on a TFT/CF substrate.
  • the hydrophilic film is formed by coating a layer of a hydrophilic polymer on a rectangular opening region on a TFT/CF substrate.
  • the alignment film material is polyimide.
  • the method for coating a liquid crystal alignment film for a TFT-LCD of the present invention comprises forming a hydrophobic film on the surface of the TFT/CF substrate, and coating is performed at the boundary between the opening region and the hydrophobic film.
  • the edge wave caused by the diffusion of the alignment film material droplets can be reduced, thereby effectively controlling the printing precision of the alignment film.
  • Fig. 1 is a schematic view showing a roller printing type coating process of a conventional liquid crystal alignment film for a TFT-LCD.
  • 2 is a schematic view showing a printing process of a conventional liquid crystal alignment film for a TFT-LCD.
  • Figure 3 is a schematic view of the structure of the film produced by the printing process.
  • Figures 4a and 4b show the effect of the halo region phenomenon and the edge wave phenomenon which are easily induced by the print coating process.
  • Fig. 5 is a view showing the structure of a hydrophobic film and a TFT/CF substrate in a coating process of a liquid crystal alignment film for a TFT-LCD of the present invention.
  • Figures 6a and 6b show the effect of diffusion of PI droplets at the hydrophobic interface and the hydrophilic interface, respectively.
  • 7a, 7b, 7c, and 7d are respectively a coating process of a liquid crystal alignment film for a TFT-LCD of the present invention, and a process in which a PI droplet is diffused in a hydrophobic film and a hydrophilic film.
  • the present invention provides a method for coating a liquid crystal alignment film for a TFT-LCD.
  • a hydrophobic film 10 is formed on the TFT/CF substrate 1 corresponding to the non-display area, and the hydrophobic film 10 is a TFT/CF substrate.
  • the partition is a plurality of rectangular opening areas which are separated from each other, each rectangular opening area corresponds to a display area and the outer frame is formed by the hydrophobic film; and the coating of the alignment film material liquid is performed along the boundary 11 of the rectangular opening area.
  • the alignment film material is PI.
  • the coating method may further include: forming a hydrophilic film in the rectangular opening region, and applying the alignment film material liquid along the boundary 11 between the hydrophilic film and the hydrophobic film 10 .
  • the hydrophilic film can be made thicker than the hydrophobic film 10.
  • the hydrophobic film 11 is formed by coating a layer of a hydrophobic polymer on the corresponding non-display area on the TFT/CF substrate 1.
  • the hydrophilic film is formed by coating a layer of a hydrophilic polymer on a rectangular opening region on the TFT/CF substrate 1.
  • the coating of the alignment film material liquid can be achieved by continuous line spraying, and the continuous lines are joined into a rectangle conforming to the boundary 11 of the rectangular opening area, that is, the alignment film
  • the coated shape of the material liquid is a rectangle instead of the existing array of dots as shown in FIG.
  • the present invention takes full advantage of the fact that PI droplets exhibit a non-wetting state at the hydrophobic interface and exhibit a fully wetted and partially wetted state at the hydrophilic interface.
  • the method for coating a liquid crystal alignment film for a TFT-LCD of the present invention comprises forming a hydrophobic film on the surface of the TFT/CF substrate, and coating is performed at the boundary between the opening region and the hydrophobic film. It is possible to produce a PI film with very good edge straightness.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

一种TFT-LCD用液晶配向膜的涂布方法，包括：在TFT/CF基板（1）上对应非显示区域形成一层疏水性薄膜（10），该疏水性薄膜（10）将TFT/CF基板（1）区隔为若干个相互分离的矩形开口区域，每一矩形开口区域对应一显示区域并由该疏水性薄膜（10）构成其外框；以及沿该矩形开口区域的边界（11）进行配向膜材料液体的涂布。该方法可以减少由于配向膜材料液体扩散而造成的边缘波。

Description

TFT-LCD用液晶配向膜的涂布方法 技术领域
本发明涉及液晶显示装置的制造工艺， 特别是涉及 LCD用液晶配向膜的涂布工艺。 背景技术
PI (聚酰亚胺）膜是位于 TFT (Thin Fi lm Transistor) 和 CF (Color Fi lter) 基板表 面的一层均匀的配向膜，可以使液晶分子按照一定的预倾角排列，从而控制光通过的方向， 通过适当的驱动电压，达到显示的目的。 PI膜的涂布工艺， 目前主要两种实现方式： PI滚 轮印刷 （Rol ler Coater) 和 PI 列印 （Inkjet ) 。
参见图 1， 转印的工艺过程大致包括： PI液从 PI喷嘴 4中喷出， 滴在旋转的金属滚 轮 3上， 通过刮刀 5刮去多余的 PI液， 经金属滚轮 3的转动和版胴 6接触， 把 PI液转存 到附在版胴 6上的印刷版 7上， 再通过版胴 6的转动与安置在印刷基台 2上的玻璃基板 1 接触， 把 PI液转印在玻璃基板 1上。 这种滚轮印刷 （Rol ler Coater) 的工艺实现方式， 存在设备笨重， 移动率低， 耗材 （Dummy基板和印刷版） 用量大、 膜厚调整困难， 操作复 杂， PI液使用率低， 运行成本高以及容易因印刷版污染产生共同缺陷等缺点。
参见图 2、 图 3、 图 4a和图 4b， 列印是采用压电陶瓷的变形， 来控制 PI液滴 8从喷 孔 9的滴到安置在印刷基台 2上的玻璃基板 1， 使液滴 8均匀分布在玻璃基板 1， 并通过 液滴 8的扩散， 形成均匀的薄膜。 这种工艺实现方式， 存在边缘膜厚不均区域大， 因喷孔 过小容易堵塞，喷孔 9间差异以及扩散不均匀而出现面内线状不均和面内面状不均等严重 制品不良， 这种方式最大的缺陷是基板表面段差过大时， PI液滴 8根本无法扩散均匀成 膜， 从而导致产品品质大幅降低甚至导致产品大量报废。 另外， 采用 Inkjet的方式印刷， 由于采用液滴的方式扩散， 所以极易形成如图 4a所示的 halo area (光环区域） 和如图 4b所示的 edge wave (边缘波） ， 影响到 PI膜的品质。
美国专利 US 20060172091揭示了一种配向膜的成型方法， 是在 TFT基板表面上对应 非显示区域的部分形成一层疏水性薄膜， 在对应显示区域的部分形成一层亲水性薄膜， 通 过用疏水性薄膜将亲水性薄膜的边界限定， 再用 inkjet方式印刷， 滴上配向膜材料液体， 形成配向膜。 这种成型方法， 在对应亲水性薄膜的区域进行 Inkjet的方式印刷与图 3所 示的传统工艺一致， 虽然可以在一定程度上避免基板表面段差过大时， 配向膜材料液滴根 本无法扩散均匀成膜， 从而导致产品品质大幅降低甚至导致产品大量报废， 但是仍然存在 如图 4a所示的 halo area (光环区域） 和如图 4b所示的 edge wave (边缘波） ， 影响到 配向膜的品质。 可见， 实有必要对现有的配向膜列印式涂布工艺进行进一步改进。 发明内容
本发明要解决的技术问题在于克服上述现有技术的不足，而提出一种 TFT-LCD用液晶 配向膜的涂布方法， 能够减少采用 inkjet方式印刷配向膜膜造成的边缘波， 有效控制配 向膜膜的印刷精度。
本发明解决上述技术问题采用的技术方案包括，提出一种 TFT-LCD用液晶配向膜的涂 布方法， 包括：
在 TFT/CF基板上对应非显示区域形成一层疏水性薄膜，该疏水性薄膜将 TFT/CF基板 区隔为若干个相互分隔的矩形开口区域，每一矩形开口区域对应一显示区域并由该疏水性 薄膜构成其外框； 以及
沿该矩形开口区域的边界进行配向膜材料液体的涂布。
本发明的涂布方法， 还包括：
在该矩形开口区域形成一层亲水性薄膜，所述的配向膜材料液体的涂布是沿该亲水性 薄膜与疏水性薄膜的边界进行的。
使该亲水性薄膜与疏水性薄膜等厚。
使所述的配向膜材料液体的涂布通过连续的线条喷涂实现。
使这些连续的线条连接成一个与该矩形开口区域的边界相一致的矩形。
所述的疏水性薄膜是通过在 TFT/CF基板上对应非显示区域涂布一层疏水性聚合物形 成的。
所述的亲水性薄膜是通过在 TFT/CF基板上的矩形开口区域涂布一层亲水性聚合物形 成的。
所述的配向膜材料为聚酰亚胺。
与现有技术相比， 本发明的 TFT-LCD用液晶配向膜的涂布方法， 通过在 TFT/CF基板 表面形成一层疏水性薄膜， 并且涂布是在开口区域与疏水性薄膜的边界进行， 可以减少由 于配向膜材料液滴扩散而造成的边缘波， 从而有效控制配向膜膜的印刷精度。 附图说明
图 1为现有的 TFT-LCD用液晶配向膜的滚轮印刷式涂布工艺示意。 图 2为现有的 TFT-LCD用液晶配向膜的列印式涂布工艺示意。
图 3为采用列印式涂布工艺制得的膜结构示意。
图 4a、 4b分别为采用列印式涂布工艺容易引发的光环区域现象和边缘波现象的效果 示意。
图 5为本发明的 TFT-LCD用液晶配向膜的涂布工艺中疏水性薄膜与 TFT/CF基板的结 构示意。
图 6a、 6b分别为 PI液滴在疏水性界面和亲水性界面进行扩散的效果示意。
图 7a、 7b、 7c以及 7d分别为本发明的 TFT-LCD用液晶配向膜的涂布工艺 PI液滴在 疏水性薄膜和亲水性薄膜进行扩散的过程示意。 具体实施方式
以下结合附图所示之最佳实施例作进一步详述。
参见图 5， 本发明提出一种 TFT-LCD用液晶配向膜的涂布方法， 在 TFT/CF基板 1上 对应非显示区域形成一层疏水性薄膜 10， 该疏水性薄膜 10将 TFT/CF基板区隔为若干个 相互分隔的矩形开口区域，每一矩形开口区域对应一显示区域并由该疏水性薄膜构成其外 框； 以及沿该矩形开口区域的边界 11进行配向膜材料液体的涂布。 优选地， 所述的配向 膜材料为 PI。
在本发明的涂布方法中， 还可包括： 在该矩形开口区域形成一层亲水性薄膜， 配向膜 材料液体的涂布是沿该亲水性薄膜与疏水性薄膜 10的边界 11进行的。优选地， 可以使该 亲水性薄膜与疏水性薄膜 10等厚。 其中， 疏水性薄膜 11是通过在 TFT/CF基板 1上对应 非显示区域涂布一层疏水性聚合物形成的。 亲水性薄膜是通过在 TFT/CF基板 1上的矩形 开口区域涂布一层亲水性聚合物形成的。
在本发明的涂布方法中， 配向膜材料液体的涂布可以通过连续的线条喷涂实现， 这些 连续的线条连接成一个与该矩形开口区域的边界 11相一致的矩形， 也就是说， 配向膜材 料液体的涂布的形状为一矩形， 而不是现有如图 3所示的由点构成的阵列。
参见图 6a、 6b, 本发明充分利用了 PI液滴在疏水性界面表现为不润湿的状态， 在亲 水性界面表现为完全润湿和部分润湿的状态。
参见图 7a、 7b、 7c以及 7d的 PI液体的扩散过程， 其中， 图 7a所示为 PI液体 8a初 始喷涂到边界 11处的情形， 然后， PI液体 8£1变形为图 7b所示的 PI液体 8b， 然后， PI 液体 8b变形为图 7c所示的 PI液体 8c，最后， PI液体 8c变形为图 7d所示的 PI液体 8d， 至此， PI液体在疏水性薄膜 10上完全扩散， 再经烘干等后续工艺的处理， 即为成品的 PI 膜了。
与现有技术相比， 本发明的 TFT-LCD用液晶配向膜的涂布方法， 通过在 TFT/CF基板 表面形成一层疏水性薄膜， 并且涂布是在开口区域与疏水性薄膜的边界进行， 可以制得边 缘直线性非常好的 PI膜。
以上， 仅为本发明之较佳实施例， 意在进一步说明本发明， 而非对其进行限定。 凡根 据上述之文字和附图所公开的内容进行的简单的替换， 都在本专利的权利保护范围之列。

Claims

权利要求
1、 一种 TFT-LCD用液晶配向膜的涂布方法， 包括：
在 TFT/CF基板上对应非显示区域形成一层疏水性薄膜，该疏水性薄膜将 TFT/CF基板 区隔为若干个相互分隔的矩形开口区域，每一矩形开口区域对应一显示区域并由该疏水性 薄膜构成其外框； 以及
沿该矩形开口区域的边界进行配向膜材料液体的涂布。
2、 如权利要求 1所述的涂布方法， 还包括：
在该矩形开口区域形成一层亲水性薄膜，所述的配向膜材料液体的涂布是沿该亲水性 薄膜与疏水性薄膜的边界进行的。
3、 如权利要求 2所述的涂布方法， 其中， 使该亲水性薄膜与疏水性薄膜等厚。
4、 如权利要求 1所述的涂布方法， 其中， 使所述的配向膜材料液体的涂布通过连续 的线条喷涂实现。
5、 如权利要求 4所述的涂布方法， 其中， 使这些连续的线条连接成一个与该矩形开 口区域的边界相一致的矩形。
6、如权利要求 1所述的涂布方法， 其中， 所述的疏水性薄膜是通过在 TFT/CF基板上 对应非显示区域涂布一层疏水性聚合物形成的。
7、如权利要求 2所述的涂布方法， 其中， 所述的亲水性薄膜是通过在 TFT/CF基板上 的矩形开口区域涂布一层亲水性聚合物形成的。
8、 如权利要求 1所述的涂布方法， 其中， 所述的配向膜材料为聚酰亚胺。
PCT/CN2011/083715 2011-11-15 2011-12-08 Tft-lcd用液晶配向膜的涂布方法 Ceased WO2013071663A1 (zh)

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