WO2014201651A1 - 一种配向膜料液喷头 - Google Patents

一种配向膜料液喷头 Download PDF

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Publication number
WO2014201651A1
WO2014201651A1 PCT/CN2013/077542 CN2013077542W WO2014201651A1 WO 2014201651 A1 WO2014201651 A1 WO 2014201651A1 CN 2013077542 W CN2013077542 W CN 2013077542W WO 2014201651 A1 WO2014201651 A1 WO 2014201651A1
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WO
WIPO (PCT)
Prior art keywords
liquid
infusion channel
alignment film
nozzle
feed liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/077542
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English (en)
French (fr)
Inventor
刘明
宋涛
马涛
赵国栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/979,650 priority Critical patent/US9348159B2/en
Publication of WO2014201651A1 publication Critical patent/WO2014201651A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • 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 invention relates to the technical field of liquid crystal displays, in particular to an improvement of an alignment film liquid nozzle. Background technique
  • a general liquid crystal display main body is mainly composed of two glass substrates and a liquid crystal layer disposed between the two glass substrates.
  • liquid crystal displays are mainly Thin Film Transistors (TFT) liquid crystal displays.
  • TFT Thin Film Transistors
  • the fabrication process of a thin film transistor liquid crystal display is generally divided into three parts: the formation of a pattern on two glass substrates, a liquid crystal sealing to form a liquid crystal display unit (CELL) between two glass substrates, and a liquid crystal display unit assembled into a module (Liquid Crystal) Module; LCM).
  • liquid crystal display unit on the glass substrate there is not only one liquid crystal display unit on the glass substrate, but a plurality of liquid crystal display units are arranged horizontally and vertically on the substrate, and the liquid crystal display unit on the substrate is arranged with different product models and sizes. The number and location of the changes also change.
  • a plurality of liquid crystal display units on the substrate form a single liquid crystal display unit by a dicing process after the liquid crystal sealing is completed.
  • a liquid crystal display unit area (referred to as a display area, other areas referred to as a non-display area, the same below) of two glass substrates is respectively arranged with a layer
  • the alignment film, the alignment film disposed in the display area of the substrate is subjected to a process of rubbing or light irradiation to produce an alignment function, thereby aligning the liquid crystal layer, and uniformly aligning the liquid crystals in a fixed direction.
  • the forming step of the alignment film comprises: (1) coating film step, the solvent-diluted alignment film material is formed on the surface of the substrate by printing or the like; (2) drying, the solvent is evaporated at a temperature of about 100 ° C Only the uniformly distributed alignment film is left; (3) The baking step is performed to cure the alignment film at a temperature of 180 ° C or higher.
  • roller printing Roller Coater
  • another PI film coating method is printing coating (also known as: INKJET).
  • the working state of the INKJET is as shown in Fig. 1.
  • the alignment film liquid is stored on the INKJET head 110, and the liquid is ejected through a large number of fine nozzles 120 disposed on the head 110.
  • the glass substrate 130 is carried on the printing base 140.
  • the movement of the printing base 140 or the movement of the INKJET nozzle 110 itself causes the liquid discharged from the nozzle 120 to fall on the glass substrate 130 to form a uniform alignment liquid. Drops.
  • the alignment film droplets then diffuse through themselves to form an alignment film.
  • a plurality of sets of nozzles 110 are designed to meet the needs of coating the entire glass substrate 130, and the position of the material coated on the glass substrate 130 is controlled by controlling the nozzles 110 of different orientations to be discharged or not.
  • FIG. 2 The structure of the existing nozzle 120 is as shown in FIG. 2, which includes:
  • a liquid chamber 121 a bottom portion and a top portion of the liquid chamber 121 are respectively provided with corresponding infusion channels 124 and a liquid pushing device 122, wherein the liquid pushing device 122 is configured to The infusion channel 124 pushes the output.
  • An inner ring groove 123 is disposed in the liquid chamber 121, and the inner ring groove 123 is connected to the liquid supply channel 125 for temporarily storing the material liquid supplied by the liquid source 126;
  • a protrusion 127 is defined between the inner ring groove 123 and the infusion channel 124 for restricting the flow direction of the liquid input from the liquid supply channel 125.
  • liquid source 126 is connected to the liquid supply channel 125 installed in the liquid chamber 121 for conveying the liquid into the liquid chamber 121.
  • INKJET nozzle requires technical requirements. Larger droplets tend to make the liquid dispersion uneven, and it is easy to cause the droplets to collide with the glass to form problems such as Drop Mura. Therefore, avoiding the above problems requires the nozzle to be as small as possible.
  • the nozzle working time accounts for less than 30% of the entire alignment film production process. That is to say, most of the time the nozzles are waiting for equipment debugging, material in and out, etc., while in the idle state (IDLE), the real printing process time is not long. Longer idle times and smaller nozzle outlets mean that the alignment membrane fluid has a longer period of time to remain in the nozzle, which can cause other problems.
  • the alignment film liquid contains a high molecular polymer, which has a certain viscosity and solid content (generally, the solid content in the liquid crystal display area is about 3 to 8%), and the solvent in the liquid liquid increases with the residence time of the liquid on the nozzle. It is easy to volatilize and cause the polymer to coagulate, forming large droplets, which affects the quality of the produced alignment film. If the large droplets are not ejected for a long time, the condensed polymer polymer may even clog the nozzle outlet, and the liquid solution cannot be discharged normally.
  • the present invention provides an alignment film material liquid nozzle capable of controlling the timing of the outflow of the material liquid, and opening or closing the material liquid output channel in time according to actual production requirements.
  • This alignment film liquid nozzle package A plurality of nozzles arranged at the bottom thereof, each nozzle comprising:
  • a liquid chamber, a bottom portion and a top portion of the liquid chamber are respectively provided with mutually corresponding infusion channels and a liquid pushing device, wherein the liquid pushing device is used for pushing and outputting the liquid from the infusion channel;
  • the liquid source is connected to a liquid supply channel installed in the liquid chamber, and is used for conveying the liquid into the liquid chamber;
  • a control valve disposed in the infusion channel is also provided for controlling an opening and closing state of the infusion channel to limit the fluid output.
  • control valve includes a solenoid valve and a driver that controls the active state of the solenoid valve.
  • solenoid valve comprises:
  • a magnetically movable armature disposed on the infusion channel, the armature and the infusion channel having a cross section of: a first angle such that the armature blocks the solution from flowing out of the infusion channel; Two angles, such that the armature allows the liquid to flow out of the infusion channel;
  • an electromagnetic valve body mounted on one side of the infusion channel and corresponding to the armature, and controlling, by the driver, a magnetic attraction force of the valve body to the armature to control the first angle and The mutual change between the second angles.
  • the armature is in transitional engagement with the infusion channel.
  • the nozzle further comprises an air blowing device corresponding to the infusion channel outlet for blowing off excess liquid collected at the outlet of the infusion channel.
  • the air blowing device includes a gas pipe provided on one side of the infusion channel and communicating with the infusion channel, and an air blower connected to the air pipe and providing a flowing air source for the air pipe.
  • the liquid pushing device is a ceramic resonator.
  • the liquid chamber further includes an inner ring groove disposed around the infusion channel, and the inner ring groove is in communication with the liquid supply channel for temporarily storing the material liquid supplied by the liquid source;
  • a protrusion is provided between the inner ring groove and the infusion channel for limiting the flow direction of the liquid input from the liquid supply channel.
  • the nozzle further comprises a central controller respectively connected to the liquid source, the liquid pusher, the driver and the blower.
  • the invention mainly controls the opening of the infusion channel through the control valve by adding a control valve and a blowing device. Closed to achieve the purpose of limiting the timing of the output of the liquid; with the blowing device, the air outlet of the nozzle in the idle state always has airflow, which can keep the liquid outlet of the nozzle unblocked, and the liquid will not accumulate and clogging the nozzle or The large droplets caused by the accumulation prevent the uneven printing, even without discharging, and greatly improve the quality of the alignment film production.
  • FIG. 1 is a schematic view showing the working state of the prior art nozzle.
  • Figure 2 is a structural view of the single nozzle of Figure 1 taken along line AA'.
  • Figure 3 is a schematic view showing the structure of the nozzle of the present invention.
  • Figure 4 is a schematic view showing another structure of the nozzle of the present invention. detailed description
  • the present invention mainly solves the problems that the nozzles are prone to clogging and droplet coalescence in the prior art.
  • Each nozzle 20 includes:
  • the liquid chamber 21 is provided with a corresponding infusion channel 24 and a liquid pushing device 22 at the bottom and the top of the liquid chamber 21, and the liquid pushing device 22 is used for discharging the liquid from the liquid.
  • Channel 24 pushes the output.
  • the liquid pushing device 22 of the embodiment may be a ceramic resonator.
  • An inner ring groove 23 is also provided in the liquid chamber 21.
  • the inner ring groove 23 is disposed around the infusion channel 24, and the inner ring groove 23 is in communication with the liquid supply channel 25 for temporarily storing the material liquid supplied by the liquid source 26; the inner ring groove 23
  • a projection 27 is provided between the infusion passage 24 for restricting the flow direction of the liquid input from the liquid supply passage 25, and is temporarily stored in the inner annular groove 23 and then flows into the infusion passage 24.
  • liquid source 26 is in communication with the liquid supply passage 25 installed in the liquid chamber 21, and the liquid is transported into the liquid chamber 21 through the liquid supply passage 25.
  • the nozzle 20 further includes a control valve A disposed on the infusion channel 24 for controlling the opening and closing state of the infusion channel 24 to limit the liquid output.
  • the control valve A is not limited to hydraulic and pneumatic, and can also be combined with different circuits to achieve the desired control, and the precision and flexibility of the control can be guaranteed.
  • the control valve A of the present embodiment passes through a solenoid valve 50 and controls the active state of the solenoid valve 50.
  • the driver 51 is implemented.
  • the solenoid valve 50 includes: a magnetic armature 52 movably mounted in the infusion channel 24, and a side mounted on the infusion channel 24 (in the wall of the liquid chamber 21) And an electromagnetic valve body 53 corresponding to the upper and lower armatures 52.
  • the valve body 53 may be a conventional iron core solenoid, and the valve body 53 is energized by the driver 51 to generate magnetism. The magnetic strength can also be controlled by the power supply current of the driver 51. To ensure the stability of the valve body 53, the valve body 53 is not in communication with the infusion passage 24.
  • the armature 52 is preferably divided into a movable portion 52b and a fixed portion 52a which are hinged to each other.
  • the fixing portion 52a is inserted and fixed from the side of the nozzle 20 to the side wall of the infusion channel 24 and is in contact with the top of the valve body 53.
  • the movable portion 52b protrudes from the infusion channel 24, and the movable portion 52b is shaped and shaped.
  • the aperture of the infusion channel 24 is equivalent to the movable portion 52b being rotatable about the hinge of the fixed portion 52a in the infusion channel 24 by magnetic attraction.
  • the magnetic force of the valve body 53 on the armature 52 is controlled by the driver 51, and the movable portion 52b of the armature 52 is rotated in the infusion channel 24 to control the opening and closing state of the infusion channel 24, and the material is controlled.
  • the hinge of the movable portion 52b and the fixed portion 52a may be a memory connection, that is, when the magnetic force of the valve body 53 received by the movable portion 52b disappears, the movable portion 52b can be automatically restored to the same level as the fixed portion 52a.
  • the movable portion 52b can also be rotated and reset by other force applying bodies (for example, airflow thrust generated by the subsequent air blowing device B).
  • the armature 52 and the valve body 53 are movably mounted in the nozzle 20, and can be easily disassembled and replaced at any time.
  • the movable portion 52b of the armature 52 and the cross section of the infusion channel 24 are: a first angle such that the armature 52 blocks the flow of the solution from the infusion channel 24; and a second angle, such that The armature 52 allows the feed to flow out of the infusion channel 24.
  • the movable portion 52b when the movable portion 52b is parallel (or overlapped) or nearly parallel to the cross section of the infusion channel 24, it is defined as a first angle (about 0°), and the movable portion 52b can be connected to the infusion channel 24 Form a transitional fit. That is, the movable portion 52b blocks the flow of the liquid in the infusion channel 24, and the infusion channel 24 is closed.
  • the second angle (about 90°) is defined at this time, and the movable portion 52b and the liquid outflow direction are at this time. Parallel or nearly parallel, the feed liquid can smoothly flow out from the infusion channel 24. Controlling the magnetic attraction force of the valve body 53 to the armature 52 by the driver 51 to control the first angle and the second angle The mutual change between them.
  • the armature may also be directly hinged to the inside of the infusion channel 24, so as to be able to be magnetically adsorbed and rotated in the infusion channel 24.
  • the bottom of the nozzle 20 of the embodiment further includes an air blowing device B and
  • the outlet of the infusion channel 24 corresponds to the position of the insufflation device B which is disposed closer to the outlet of the infusion channel 24 (liquid output terminal) than the control valve A.
  • the air blowing device B includes a gas pipe 61 disposed on the side of the infusion channel 24 and communicating with the infusion channel 24, and a blower connected to the gas pipe 61 and providing a flow source of gas to the gas pipe 61 62.
  • the trachea 61 can also be movably disposed at the bottom of the entire nozzle 20 and at the outlet side of the infusion channel 24 for the purpose of blowing off the liquid.
  • an external central controller 70 is provided to be connected to the liquid material source 26, the liquid liquid pusher 22, the actuator 51 and the air blower 62, respectively.
  • the nozzle When the nozzle is transferred from the idle state to the working state, the moving nozzle is aligned with the glass substrate placed on the printing base, and the nozzle 20 is correspondingly also in the working state.
  • the starter driver 51 When the central controller 70 keeps the blower 62 open, the starter driver 51 is connected to the valve body 53. At this time, the actuator 51 energizes the valve body 53 to cause the valve body 53 to generate a sufficiently large magnetic attraction armature 52, and in particular, the adsorption movable portion 52b is rotated toward the valve body 53. Rotating at the movable portion 52b, while the infusion channel 24 is formed into a passage, the liquid is liquid The liquid in the chamber 21 then flows out through the infusion channel 24.
  • the air tube 61 keeps blowing, so that the outlet of the infusion channel 24 maintains a certain airflow, preventing the liquid material from initially generating bubbles at the output.
  • the movable portion 52b is completely opened, the liquid is uniformly dropped according to the preset droplet size, and the gas pipe 61 is completely closed at this time.
  • the movable portion 52b forms a second angle with the cross section of the infusion channel 24, as shown in FIG.
  • the air outlet 61 of the air tube 61 disposed under the valve body 53 is blocked by the movable portion 52b, thereby avoiding the airflow disturbance during the liquid output process, and the liquid can smoothly flow out from the unobstructed infusion passage 24.
  • the central controller 70 instructs the liquid propeller 22 to start, ensuring that the liquid is accurately printed to a predetermined position of the glass substrate according to a certain droplet size and printing speed.
  • the central controller 70 monitors the volume of the liquid in the liquid chamber 21, and promptly supplies the liquid source 26 to supply the new liquid to the liquid chamber 21.
  • the central controller 70 instructs the liquid propeller 22 to stop working, and at the same time instructs the driver 51 of the control valve A to disconnect the power supply from the valve body 53, so that the movable portion 52b of the armature 52 returns to the first angle. status.
  • the air tube 61 is gradually opened, and the gas is continuously blown to the infusion passage 24, so that the liquid remaining at the outlet of the infusion passage 24 does not solidify or gather into large droplets, thereby achieving the purpose of preventing the nozzle 20 from being blocked. At this point, the nozzle enters the idle state again.
  • the invention mainly increases the control valve and the air blowing device, controls the opening and closing of the infusion channel through the control valve to achieve the purpose of limiting the output of the liquid liquid; and the blowing device makes the airflow of the nozzle infusion channel in the idle state always pass through, Keeping the liquid outlet of the nozzle unobstructed, the liquid will not accumulate and clogging the large droplets caused by the nozzle or the accumulation, thereby avoiding the uneven printing, even without discharging, greatly improving the production quality of the alignment film.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Coating Apparatus (AREA)
  • Liquid Crystal (AREA)
  • Nozzles (AREA)

Abstract

本发明涉及一种配向膜料液喷头，所述喷头包括排布于其底部的若干个喷嘴，每个喷嘴包括：料液腔，所述料液腔底部、顶部分别设置有相互对应的输液通道、料液推压器，所述料液推压器用于将所述料液从所述输液通道推压输出；料液源，所述料液源与装设在所述料液腔上的供液通道连通，用于往所述料液腔内输送料液；还包括设置于所述输液通道的控制阀，用于控制所述输液通道的开闭状态，从而限制所述料液输出。本发明通过在喷嘴上装设控制阀和吹气装置，防止料液在喷嘴上聚集凝结而堵塞喷嘴或者堆积造成的大液滴，从而避免了喷印不均，甚至不出料的情况，大大提高配向膜生产质量。

Description

一种配向膜料液喷头 技术领域
本发明涉及液晶显示器技术领域， 尤其是对一种配向膜料液喷头的改进。 背景技术
一般的液晶显示器主体主要由两片玻璃基板以及配置在两玻璃基板间的 液晶层构成。 目前， 液晶显示器以薄膜晶体管（Thin Film Transistor; TFT) 液 晶显示器为主。 薄膜晶体管液晶显示器的制作工艺一般分为三个部份： 两片玻 璃基板上图形的制作， 液晶密封到两片玻璃基板之间形成液晶显示单元 (CELL) , 液晶显示单元组装成模块 （Liquid Crystal Module; LCM)。 为了节 约成本和实现产品多元化， 玻璃基板上并不是只有一个液晶显示单元， 而是在 基板上横竖地排列多个液晶显示单元， 并且随着产品型号和尺寸的不同， 基板 上液晶显示单元排列的个数和位置也随之变化。基板上的多个液晶显示单元在 完成液晶密封之后通过切割工艺形成单个液晶显示单元。 在将液晶密封到两片玻璃基板之间形成液晶显示单元的制作工艺过程中， 两片玻璃基板的液晶显示单元区域（简称显示区， 其他区域简称非显示区， 下 同） 分别会配置一层配向膜 （Alignment Film) , 配置在基板显示区的配向膜经 过摩擦或者光照射等工艺方式产生配向能力， 从而对液晶层起到配向作用， 使 液晶沿着固定方向均一排列。 配向膜的形成歩骤包含： （1 )涂膜歩骤， 将溶剂稀释过的配向膜材料通过 印刷等工艺形成于基板表面； （2) 干燥歩骤， 以 100°C左右的温度使溶剂蒸发 只留下分布均一的配向膜； （3 )焙烧歩骤， 以 180°C以上的温度使配向膜固化。 在涂膜歩骤中， 一般采用滚轮印刷（Roller Coater); 另一种 PI膜涂布方式是列 印涂布 （又称为： INKJET)。
该 INKJET的工作状态如图 1所示， 配向膜料液储存在所述 INKJET喷头 110上， 通过布设在喷头 110上的大量微细的喷嘴 120将料液喷出。 在印刷基 台 140上承载有玻璃基板 130，通过印刷基台 140的移动或者 INKJET喷头 110 自身的移动， 从喷嘴 120喷出的料液落在玻璃基板 130上形成均匀的配向膜液 滴。 然后所述配向膜液滴通过自身的扩散、 凝结成配向膜。 INKJET方法中会 设计多组喷头 110， 以满足涂布整个玻璃基板 130的需要， 通过控制不同方位 的喷头 110出液或不出液， 来控制料涂布在玻璃基板 130上的位置。
其中， 现有的喷嘴 120结构如图 2所示， 其包括：
一料液腔 121， 所述料液腔 121底部、 顶部分别设置有相互对应的输液通 道 124、 料液推压器 122， 所述料液推压器 122用于将所述料液从所述输液通 道 124推压输出。
料液腔 121内还设有一内环槽 123围绕所述输液通道 124设置，所述内环 槽 123与所述供液通道 125连通， 用于暂存所述料液源 126补给的料液； 所述 内环槽 123与所述输液通道 124之间设有凸起 127， 用于限制从供液通道 125 输入的料液的流动方向。
以及一料液源 126， 所述料液源 126与装设在所述料液腔 121上的供液通 道 125连通， 用于往所述料液腔 121内输送料液。
使用这种 INKJET喷嘴需要配合工艺上的要求。 液滴较大容易使得料液扩 散不均， 还容易使得液滴与 Glass造成冲击形成 Drop Mura等问题， 因此避免 上述问题就要求喷嘴越小越好。 实际的生产过程上， 喷嘴工作时间占整个配向 膜制作工艺时间不到 30%。 也就是说大部分时间喷嘴都是在等待设备调试、物 料进出等工序， 而处于空闲状态 （IDLE) ， 真正的喷印工艺时间不长。 较长的空闲时间， 较小的喷嘴出口， 意味着配向膜料液具有较长的时间停 留在喷嘴中， 容易造成其他问题。 例如， 配向膜料液含有高分子聚合物， 有一 定的粘性和固含量 （一般液晶显示领域固含量为 3〜8%左右） ， 随着料液在喷 嘴上停留时间延长， 料液中的溶剂很容易挥发导致高分子聚合物凝结， 形成大 液滴， 影响制作出的配向膜质量。 若大液滴过长时间不被喷出， 凝结的高分子 聚合物甚至会对喷嘴出口造成堵塞， 料液不能正常吐出的问题。
如何对上述喷嘴进行改进或采用有效方法控制配向膜料液的输出时机， 解 决配向膜高分子聚合物的凝结， 甚至堵塞喷嘴的问题， 是人们亟待解决的。 发明内容
为解决上述问题， 本发明提供一种配向膜料液喷头， 能控制料液流出的时 机， 根据实际生产需要及时开启或关闭料液输出通道。 这种配向膜料液喷头包 括排布于其底部的若干个喷嘴， 每个喷嘴包括：
料液腔， 所述料液腔底部、 顶部分别设置有相互对应的输液通道、 料液推 压器， 所述料液推压器用于将所述料液从所述输液通道推压输出；
料液源， 所述料液源与装设在所述料液腔上的供液通道连通， 用于往所述 料液腔内输送料液；
还包括设置于所述输液通道的控制阀， 用于控制所述输液通道的开闭状 态， 从而限制所述料液输出。
优选地， 所述控制阀包括电磁阀以及控制所述电磁阀活动状态的驱动器。 优选地， 所述电磁阀包括：
活动装设于所述输液通道上的磁吸性衔铁，所述衔铁与所述输液通道的横 截面存在： 第一夹角， 使得所述衔铁阻隔所述料液从输液通道中流出； 以及第 二夹角， 使得所述衔铁允许所述料液从输液通道流出；
以及装设于所述输液通道的一侧并与所述衔铁对应的电磁性阀体，通过所 述驱动器控制所述阀体对所述衔铁的磁吸力大小， 达到控制所述第一夹角和第 二夹角之间的相互变化。
优选地， 所述衔铁与所述输液通道过渡配合。
优选地， 所述喷嘴还包括一吹气装置与所述输液通道出口对应， 用于吹脱 聚集于所述输液通道出口的多余料液。
优选地， 所述吹气装置包括设于所述输液通道一侧并与所述输液通道连通 的气管， 以及与所述气管连接并为所述气管提供流动气源的鼓风器。 优选地， 所述料液推压器为陶瓷谐振器。
优选地， 所述料液腔还包括一内环槽围绕所述输液通道设置， 所述内环槽 与所述供液通道连通， 用于暂存所述料液源补给的料液； 所述内环槽与所述输 液通道之间设有凸起， 用于限制从供液通道输入的料液的流动方向。
优选地， 所述喷嘴还包括一中央控制器分别与所述料液源、 料液推压器、 驱动器及鼓风器连接。
本发明主要通过增加控制阀和吹气装置， 通过控制阀来控制输液通道的开 闭达到限制料液输出时机的目的； 配合吹气装置使得处于空闲状态下的喷嘴输 液通道出口一直有气流通过， 可以保持喷嘴的料液出口的畅通， 料液也不会聚 集凝结而堵塞喷嘴或者堆积造成的大液滴， 从而避免了喷印不均， 甚至不出料 而情况， 大大提高配向膜生产质量。
附图说明
图 1为现有技术的喷头工作状态示意图。
图 2为图 1中单个喷嘴沿 AA'剖切线处的结构示意图。 图 3为本发明喷嘴的结构示意图。
图 4为本发明喷嘴的另一结构示意图。 具体实施方式
为使本发明的上述目的、 特征和优点能更明显易理解， 下面结合本发明具 体实施例， 详细说明如下： 本发明主要解决现有技术中喷嘴容易造成堵塞和液滴聚结等问题。
本实施例的喷头由若干个喷嘴组装而成， 并对喷嘴结构进行了改进， 其内 部结构可参见图 3所示， 每个喷嘴 20包括：
料液腔 21，所述料液腔 21底部、顶部分别设置有相互对应的输液通道 24、 料液推压器 22，所述料液推压器 22用于将所述料液从所述输液通道 24推压输 出。 其中， 本实施例的料液推压器 22可为陶瓷谐振器。
所述料液腔 21 内还设有内环槽 23。 所述内环槽 23围绕所述输液通道 24 设置， 所述内环槽 23与所述供液通道 25连通， 用于暂存所述料液源 26补给 的料液；所述内环槽 23与所述输液通道 24之间设有凸起 27，用于限制从供液 通道 25输入的料液的流动方向， 先通过内环槽 23暂存再流入该输液通道 24。
以及，一料液源 26，所述料液源 26与装设在所述料液腔 21上的供液通道 25连通， 通过供液通道 25往所述料液腔 21内输送料液。
喷嘴 20还包括设置于所述输液通道 24上的控制阀 A, 用于控制所述输液 通道 24的开闭状态， 从而限制所述料液输出。控制阀 A并不限于液压、气动， 还可以配合不同的电路来实现预期的控制， 而控制的精度和灵活性都能够保 证。本实施例的控制阀 A是通过一电磁阀 50以及控制该电磁阀 50活动状态的 驱动器 51实现的。 如图 3所示， 所述电磁阀 50包括： 活动装设于所述输液通 道 24中的磁吸性衔铁 52， 以及装设于所述输液通道 24的一侧 （料液腔 21壁 内）并与所述衔铁 52上下对应的电磁性阀体 53。其中， 所述阀体 53可以是常 用的带铁芯螺线管， 通过驱动器 51给阀体 53通电后产生磁性， 磁性强弱还可 以由驱动器 51的供电电流所控制。 为保证阀体 53的稳定性， 阀体 53不与所 述输液通道 24相连通。
为了便于该衔铁 52在输液通道 24上的固定， 优选将所述衔铁 52分为相 互铰接的活动部 52b和固定部 52a。所述固定部 52a从喷嘴 20—侧插入固定于 输液通道 24侧壁内、 并与所述阀体 53顶部相接； 所述活动部 52b凸伸于该输 液通道 24中， 活动部 52b形状大小与所述输液通道 24孔径相当， 使得活动部 52b能绕其与固定部 52a的铰接处在输液通道 24中受磁力吸附而转动。通过所 述驱动器 51控制所述阀体 53对所述衔铁 52的磁吸力大小， 使衔铁 52活动部 52b在输液通道 24中转动， 达到控制所述输液通道 24的开闭状态， 控制所述 料液输出的时机。 进一歩地， 为了更优化衔铁 52结构和功能， 活动部 52b与 固定部 52a的铰接可以是一种具有记忆性的连接， 即当活动部 52b所受到的阀 体 53磁吸力消失后， 活动部 52b能自动恢复至与固定部 52a呈同一水平线的 状态。 当然， 在其他实施例中， 活动部 52b也可以在其他施力体（例如， 后续 的吹气装置 B产生的气流推力） 的作用下转动复位。且， 衔铁 52和阀体 53是 活动装设于该喷嘴 20中， 可方便地拆装和随时更换。
所述衔铁 52的活动部 52b与所述输液通道 24的横截面存在： 第一夹角， 使得所述衔铁 52阻隔所述料液从输液通道 24中流出； 以及第二夹角， 使得所 述衔铁 52允许所述料液从输液通道 24流出。
例如， 当所述活动部 52b与所述输液通道 24横截面平行 （或重叠） 或近 乎平行， 定义此时为第一夹角 （约为 0° )， 活动部 52b可与所述输液通道 24 形成过渡配合。 也就是说， 活动部 52b阻隔了输液通道 24内料液的流通， 使 输液通道 24成闭合状态。 当所述活动部 52b与所述输液通道 24横截面垂直或近乎垂直， 结合图 4 所示， 定义此时为第二夹角 （约为 90° )， 此时活动部 52b与料液流出方向平 行或近乎平行， 所述料液能从输液通道 24顺利流出。 通过所述驱动器 51控制 所述阀体 53对所述衔铁 52的磁吸力大小， 达到控制所述第一夹角和第二夹角 之间的相互变化。
在其他实施例中， 衔铁也可以只有活动部直接铰接在输液通道 24 内侧， 实现在输液通道 24内能受磁力吸附而转动的目的。
为进一歩地解决配向膜料液聚集凝结的问题，吹脱聚集于所述输液通道 24 出口的多余料液， 如图 3所示， 本实施例的喷嘴 20底部还包括一吹气装置 B 与所述输液通道 24出口对应， 该吹气装置 B的位置相对所述控制阀 A更靠近 输液通道 24出口 （料液输出终端） 设置。 具体地， 吹气装置 B包括设于所述 输液通道 24—侧并与所述输液通道 24连通的气管 61， 以及与所述气管 61连 接并为所述气管 61提供流动气源的鼓风器 62。在其他实施例中，气管 61也可 以活动设于整个喷嘴 20底部、输液通道 24出口一侧均可实现吹脱料液的目的。
并且，为了更好地调控各个元器件的工作状态， 设置一外部中央控制器 70 分别与所述料液源 26、 料液推压器 22、 驱动器 51及鼓风器 62连接。
下面结合图 3、 图 4， 介绍这种配向膜料喷头的工作流程：
S1 : 按照图 3在所述喷嘴 20上组装料液推压器 22、 控制阀 A、 吹气装置 B, 然后将多个喷嘴 20组装成喷头（图中未示出）。所述料液源 26从所述供液 通道 25往喷嘴 20的料液腔 21中注入配向膜料液。料液首先在凸起 27的引导 下暂存在内环槽 23中， 待内环槽 23内料液盛满溢出而流入输液通道 24中。 移动喷头对准印刷基台 （图中未示出）， 等待玻璃基板（图中未示出） 的装入。
S2: 当喷头处于空闲状态 （IDLE) , 喷嘴 20也相应处于空闲状态， 中央 控制器 70指令驱动器 51断开与所述阀体 53连接， 使阀体 53 自身不产生磁性 从而对所述衔铁 52不产生磁吸力， 衔铁 52的活动部 52b与输液通道 24的横 截面形成第一夹角， 阻隔输液通道 24 内全部或大部分料液的流出。 同时， 中 央控制器 70指令鼓风器 62启动， 使气管 61不断对输液通道 24出口鼓风， 气 流不断流动使残留或渗出的料液无法积聚或凝结。
S3、 当喷头由空闲状态转入工作状态， 移动喷头对准置于印刷基台上的玻 璃基板， 此时喷嘴 20相应地也进入工作状态。 中央控制器 70保持鼓风器 62 开启的情况下， 启动驱动器 51与所述阀体 53连接。 此时， 驱动器 51为所述 阀体 53通电使阀体 53产生足够大的磁性吸附衔铁 52， 尤其是吸附活动部 52b 向阀体 53转动。 在活动部 52b—边转动， 一边使输液通道 24形成通路， 料液 腔 21中的料液随之通过输液通道 24流出。
活动部 52b在转动而未完全与输液通道 24贴合时，气管 61—直保持吹气， 使输液通道 24出口保持一定气流流动， 防止料液在输出初始有气泡产生。 直 到活动部 52b完成打开， 料液按照预设的液滴大小均匀滴出， 气管 61此时完 全关闭。
当阀体 53吸附活动部 52b完全转动至紧贴输液通道 24内侧， 活动部 52b 与输液通道 24横截面形成第二夹角， 如图 4所示。 此时， 设于阀体 53下方的 气管 61其出气孔被活动部 52b阻挡， 避免了料液输出过程的气流扰动， 料液 可从通畅的输液通道 24中顺利流出。 在料液流出的同时， 中央控制器 70指令 所述料液推进器 22启动， 保证该料液按照一定液滴大小、 喷印速度准确喷印 至玻璃基板预设位置。喷印过程中，中央控制器 70监控料液腔 21内料液容量， 及时指令料液源 26为料液腔 21补给新的料液。
S4: 当一次喷印完成， 中央控制器 70指令料液推进器 22停止工作， 同时 指令控制阀 A的驱动器 51断开与阀体 53的供电， 使衔铁 52活动部 52b回复 至第一夹角的状态。 活动部 52b转动过程中， 气管 61逐渐被打开， 不断往输 液通道 24吹出气体，使残留在输液通道 24出口的料液不会凝固或者聚成大滴， 从而达到杜绝喷嘴 20被堵塞的目的。 此时， 喷头再次进入空闲状态。
重复 S2、 S3、 S4若干次， 直到完成配向膜的制作。 本发明主要通过增加控制阀和吹气装置， 通过控制阀来控制输液通道的开 闭达到限制料液输出时机目的； 配合吹气装置使得处于空闲状态下的喷嘴输液 通道出口一直有气流通过， 可以保持喷嘴的料液出口的畅通， 料液也不会聚集 凝结而堵塞喷嘴或者堆积造成的大液滴， 从而避免了喷印不均， 甚至不出料而 情况， 大大提高配向膜生产质量。 尽管已经参照其示例性实施例具体显示和描述了本发明， 但是本领域的技 术人员应该理解， 在不脱离权利要求所限定的本发明的精神和范围的情况下， 可以对其进行形式和细节上的各种改变。

Claims

权利要求书
1、 一种配向膜料液喷头， 所述喷头包括排布于其底部的若干个喷嘴， 每 个喷嘴包括：
料液腔， 所述料液腔底部、 顶部分别设置有相互对应的输液通道、 料液推 压器， 所述料液推压器用于将所述料液从所述输液通道推压输出；
料液源， 所述料液源与装设在所述料液腔上的供液通道连通， 用于往所述 料液腔内输送料液；
其中， 还包括设置于所述输液通道的控制阀， 用于控制所述输液通道的开 闭状态， 从而限制所述料液输出。
2、 根据权利要求 1所述配向膜料液喷头， 其中， 所述控制阀包括电磁阀 以及控制所述电磁阀活动状态的驱动器。
3、 根据权利要求 2所述配向膜料液喷头， 其中， 所述电磁阀包括： 活动装设于所述输液通道上的磁吸性衔铁， 所述衔铁与所述输液通道的横 截面存在： 第一夹角， 使得所述衔铁阻隔所述料液从输液通道中流出； 以及第 二夹角， 使得所述衔铁允许所述料液从输液通道流出；
以及装设于所述输液通道的一侧并与所述衔铁对应的电磁性阀体，通过所 述驱动器控制所述阀体对所述衔铁的磁吸力大小， 达到控制所述第一夹角和第 二夹角之间的相互变化。
4、 根据权利要求 3所述配向膜料液喷头， 其中， 所述衔铁与所述输液通 道过渡配合。
5、 根据权利要求 2所述配向膜料液喷头， 其中， 所述喷嘴还包括一吹气 装置与所述输液通道出口对应， 用于吹脱聚集于所述输液通道出口的多余料 液。
6、 根据权利要求 5所述配向膜料液喷头， 其中， 所述吹气装置包括设于 所述输液通道一侧并与所述输液通道连通的气管， 以及与所述气管连接并为所 述气管提供流动气源的鼓风器。
7、 根据权利要求 1所述配向膜料液喷头， 其中， 所述料液推压器为陶瓷 谐振器。
8、 根据权利要求 1所述配向膜料液喷头， 其中， 所述料液腔还包括一内 环槽围绕所述输液通道设置， 所述内环槽与所述供液通道连通， 用于暂存所述 料液源补给的料液； 所述内环槽与所述输液通道之间设有凸起， 用于限制从供 液通道输入的料液的流动方向。
9、 根据权利要求 6所述配向膜料液喷头， 其中， 所述喷嘴还包括一中央 控制器分别与所述料液源、 料液推压器、 驱动器及鼓风器连接。
PCT/CN2013/077542 2013-06-17 2013-06-20 一种配向膜料液喷头 Ceased WO2014201651A1 (zh)

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