WO2016070557A1 - 转印滚轮、封装胶膜涂布系统、及封装胶膜的方法 - Google Patents

转印滚轮、封装胶膜涂布系统、及封装胶膜的方法 Download PDF

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Publication number
WO2016070557A1
WO2016070557A1 PCT/CN2015/075500 CN2015075500W WO2016070557A1 WO 2016070557 A1 WO2016070557 A1 WO 2016070557A1 CN 2015075500 W CN2015075500 W CN 2015075500W WO 2016070557 A1 WO2016070557 A1 WO 2016070557A1
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WIPO (PCT)
Prior art keywords
glue
display panel
coating
transfer roller
film
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Application number
PCT/CN2015/075500
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English (en)
French (fr)
Inventor
井杨坤
武兴
Original Assignee
京东方科技集团股份有限公司
合肥京东方光电科技有限公司
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.)
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Application filed by 京东方科技集团股份有限公司, 合肥京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/785,657 priority Critical patent/US10610886B2/en
Priority to EP15778184.0A priority patent/EP3031534B1/en
Publication of WO2016070557A1 publication Critical patent/WO2016070557A1/zh

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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/87Passivation; Containers; Encapsulations
    • H10K59/873Encapsulations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/28Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/84Passivation; Containers; Encapsulations
    • H10K50/844Encapsulations

Definitions

  • Embodiments of the present invention relate to an encapsulation film coating system, and more particularly to an encapsulation film coating system for packaging a substrate of a display device, a transfer roller thereof, and a method of encapsulating a film.
  • OLEDs Organic Light Emitting Diodes
  • AMOLEDs Active Matrix Organic Light Emitting Diodes
  • OLED illumination is to deposit a plurality of layers of organic materials (including organic luminescent materials) between two electrodes, and to illuminate the organic luminescent material by applying a direct current voltage between the electrodes.
  • OLED displays the organic luminescent material is prone to failure in contact with water and oxygen, so the glass substrate placed in front of it must be packaged with a back cover to isolate moisture and oxygen and prolong the life of the display.
  • OLED displays are commonly packaged with metal covers, glass covers or films.
  • the metal cover plate and the glass have different expansion coefficients, which easily deform the entire display device and are costly.
  • a glass cover is usually used. Based on the OLED manufacturing process, it is required to etch a plurality of grooves having a certain range and a flat bottom on the glass cover plate, and fill the grooves with a desiccant, and at the same time, etch a high-precision alignment mark to match the display.
  • the glass substrate is precisely aligned.
  • a thick anti-etching protective film is applied on the front and rear surfaces of the flat glass for forming the substrate, and then the concave side is formed on the one side of the glass by exposure.
  • the groove pattern is developed to remove the protective film in the pattern, the glass is placed in the etching solution to etch the groove, and finally the protective film on the glass surface is removed.
  • the manufacturing cost is high; in particular, the protective film and the glass watch
  • the surface has insufficient adhesion and is easy to fall off, resulting in a large number of defects, which further increases the manufacturing cost.
  • the uniformity of the surface coating is very high, so it is necessary to provide a surface that can achieve high-efficiency coating, high uniformity of coating, and precise coating process.
  • Gluing equipment The drip-type coating method currently used, although the coating speed is relatively high, the uniformity of the glue is low, and many nozzles need to be provided, and it takes a lot of time to replace the parts.
  • a transfer roller comprising: a cylinder; an absorbing layer coated on the outside of the cylinder; and a transfer layer coated on the outside of the absorbing layer for applying glue
  • the liquid is transferred onto the coating roller, wherein the absorption layer is provided with a plurality of micropores, and the transfer layer is provided with a plurality of first through holes, and the first through holes are configured to rotate the micropores
  • the roller is connected externally.
  • the size of the absorbing particles in the micropores gradually increases from the inside to the outside in the radial direction.
  • the glue introduction device comprises a plurality of glue liquid introduction units arranged side by side, each glue liquid introduction unit comprising: a liquid storage chamber configured to be stored for storage from a glue for the glue storage device; a nozzle communicating with the reservoir to discharge the glue to the transfer roller; and a driving device configured to drive the glue in the reservoir into the nozzle .
  • the driving device includes: a cylinder in communication with the liquid storage chamber to supply gas pressure into the liquid storage chamber; and a gas pipe connected to the cylinder And inputting a gas of an external air source into the cylinder; and a control valve disposed on the air pipe to control a pressure in the cylinder.
  • the driving device further includes: a piston disposed in the liquid storage chamber, and the piston is moved by gas from the air tube to push the glue The liquid flows out of the nozzle.
  • the encapsulation film coating system further includes a control system, the control system comprising: detection means configured to detect that the display panel has been coated a distribution of glue on the core; and a controller configured to control the drive device to adjust the amount of glue discharged from the nozzle based on the respective conditions of the detected glue.
  • control system further includes image processing means for processing an image signal of the image pickup device to obtain a distribution of the glue solution, And the image processing device is configured to filter out noise signals in the image signal.
  • the surface of the coating roller covers a coating layer made of a piezoelectric material, the coating layer being configured to control transfer to a display panel The amount of glue on the.
  • the controller is further configured to control the coating layer to produce a deformation that matches a pattern to be produced of a corresponding region of the display panel.
  • the controller controls the coating layer to generate a depression at a position corresponding to the position of the protrusion
  • the deformation of the display panel controls the coating layer to produce a convex deformation at a position corresponding to the position of the recess when the corresponding area of the display panel has a recess.
  • a method of encapsulating a film on a display panel using the above-described package film coating system comprising the steps of:
  • the glue is applied to the display panel by a coating roller.
  • the distribution of the glue includes at least one of a thickness of the glue, a plane size, a continuous distribution condition, whether or not the bubble is contained, and a distribution state of the bubble.
  • the step of detecting the distribution of the glue applied to the display panel includes: acquiring an image signal regarding the distribution of the applied glue using the image pickup device; and utilizing The image processing device processes the image signal of the imaging device to obtain information about the distribution of the glue, wherein the processing of the image signal includes filtering out the noise signal in the image signal.
  • the glue applied to the edge portion of the display panel is different from the physical property of the glue applied to the body portion inside the edge portion, so that the film formed at the edge portion is The sealing property is higher than that of the film formed on the main body portion.
  • the physical property comprises at least one of a concentration, a thickness, and a viscosity of the glue.
  • the glue discharged from the at least one glue input unit of the both side portions of the transfer roller and the plurality of glue input units located at the intermediate portion between the both side portions The physical properties of the discharged glue are different.
  • At least one glue input on the two side portions is performed after the completion of the discharge of the glue by the plurality of glue input units located at the intermediate portion between the two side portions The unit discharges the glue.
  • FIG. 1 is a schematic block diagram of a package film coating system in accordance with a first exemplary embodiment of the present invention
  • FIG. 2 is a side view of a package film coating system in accordance with a first exemplary embodiment of the present invention, the support table not being shown;
  • FIG. 5 is a schematic diagram of a glue introduction unit according to an exemplary embodiment
  • Figure 6 is a block diagram showing the control principle of a package film coating system according to a first exemplary embodiment of the present invention
  • FIG. 9 is a schematic block diagram of controlling a glue discharge amount using a control system, according to an exemplary embodiment.
  • a package film coating system comprising: a support table configured to carry a display panel to be packaged; a glue liquid storage device for providing a glue; a glue introduction And a device mounted on the support table, coupled to the glue storage device to receive the glue output from the glue storage device, and a transfer roller configured to receive the glue from the glue introduction device.
  • FIG. 1 is a schematic block diagram of a package film coating system according to a first exemplary embodiment of the present invention
  • FIG. 2 is a side view of a package film coating system according to a first exemplary embodiment of the present invention. View, the support table is not shown in the drawings
  • FIG. 3 is another side view of the package film coating system according to the first exemplary embodiment of the present invention, showing the support table.
  • An encapsulation film coating system according to an exemplary embodiment of the present invention is used to encapsulate a film onto a display panel.
  • the display panel of the present invention may be based on an Organic Light Emitting Diode (OLED), and an active matrix.
  • OLED Organic Light Emitting Diode
  • An Active Matrix Organic Light Emitting Diode (AMOLED) display panel and includes an array substrate and a touch substrate that are paired together, and can prevent, for example, water, water vapor, and oxygen by encapsulating a film on the outside of the substrate of the display panel.
  • External impurities such as the inside enter the display panel, so that the luminescent material inside the display panel is physically isolated from the outside, and the performance of the luminescent material is kept stable for a long time, and the service life of the display panel is prolonged.
  • a package film coating system includes a support table 1, a glue storage device 2, a glue introduction device 3, a transfer roller 4, and a coating roller 5.
  • the support table 1 is configured to carry and fix the display panel 100 to be packaged; the glue storage device 2 is used to supply glue; the glue introduction device 3 is connected to the glue storage device 2, for example, through a conduit to receive the glue storage.
  • the glue output from the device 2; the transfer roller 4 is arranged to receive the glue from the glue introduction device 2; the transfer roller 4 uniformly transfers the glue to the coating roller 5, and the coating roller 5 coats the glue On the display panel 100.
  • the glue coated on the display panel solidifies to form an encapsulant film, which can prevent undesired substances such as water, water vapor, oxygen, dust particles and the like from entering the inside of the display panel from the outside, thereby making the luminescent material inside the display panel and the outside Physical isolation.
  • the glue storage device 2, the glue introduction device 3, the transfer roller 4, and the application roller 5 can be attached or fixed to the bracket or frame 11.
  • the transfer roller 4 is configured to introduce a glue onto the coating roller 5, and includes: a cylinder 42 mounted on the rotating shaft 41, an absorbing layer and a transfer layer 45, and an absorbing layer package. Covering the outside of the cylinder 42, the absorption layer is provided with a plurality of micropores communicating with the outside.
  • the transfer layer 45 is coated on the outside of the absorbent layer for transferring the glue onto the coating roller 5.
  • a plurality of first through holes are provided in the transfer layer 45 to allow impurities in the glue to enter the micro holes in the absorption layer.
  • the transfer layer 45 is composed of a soft pore material and can be in close contact with the wrap layer 44 to control the amount of glue applied to the applicator roller 5.
  • the impurities in the glue can be absorbed, and the glue on the transfer coating roller 5 can be uniformly coated on the coating roller.
  • the absorbent layer can also absorb excess glue on the transfer roller.
  • the absorbent layer includes a storage layer 43 and a wrap layer 44, wherein the storage layer 43 is coated on the barrel 42 and micropores are formed in the storage layer to store impurities and/or excess glue liquid.
  • the wrap layer 44 is coated on the storage layer 43 to fix the storage layer 43, and the wrap layer 44 is provided with a plurality of second through holes to allow impurities to be absorbed into the micro holes.
  • the micropores are provided with absorbing particles to enhance the adsorption capacity of the impurity particles.
  • the first through hole and the second through hole are configured to form a plurality of micro holes in the transfer layer 45 and the wrap layer 44, respectively.
  • the transfer roller 4 of the embodiment of the present invention since the transfer roller 4 is provided with an absorbing layer and a transfer layer having a plurality of through holes, the excess glue The liquid and the impurities in the glue can pass through the through holes in the transfer layer into the micropores of the absorption layer, thereby achieving uniform distribution of the glue on the surface of the transfer layer.
  • the storage layer 43 of the absorbing layer may be made of any one of polyurethane, polytetrafluoroethylene, and carbon nanotubes and form a foam-like structure.
  • the storage layer 43 of the absorbing layer can pass through the plurality of layers on the transfer layer.
  • a plurality of second through holes in a through hole and wrap layer 44 adsorb other impurities or excess glue in the glue which will be adsorbed by the absorbing particles located in the micropores.
  • the glue introduction device 3, the transfer roller 4, and the coating roller 5 are all mounted on the bracket 11, and the bracket 11 is rotatable relative to the support table 1 through the guide rail 12. It is movably mounted on the support table 1.
  • a positioning device 36 is also provided on the bracket 11 for positioning the respective positions or relative positions of the glue introducing device 3, the transfer roller 4, and the coating roller 5.
  • the positioning device 36 includes a plurality of motors respectively corresponding to the glue introducing device 3, the transfer roller 4, and the coating roller 5. By operating the corresponding motor, the glue introducing device 3, the transfer roller 4, and the coating roller 5 can be moved in the lateral direction (axial direction of the coating roller 5) or in the longitudinal direction with respect to the support table.
  • the support table 1 is arranged to be movable along the guide rails while the bracket 11 is arranged to be fixed.
  • the glue introduction device 3 includes a plurality of glue introduction units arranged side by side, each glue introduction unit including a reservoir 31, a nozzle 32, and a driving device .
  • the liquid storage chamber 31 is provided for storing the glue liquid from the glue liquid storage device; the nozzle 32 is in communication with the liquid storage chamber 31 to discharge the glue liquid to the transfer roller 4; and the driving device is provided for use in the liquid storage chamber 31
  • the glue is driven into the nozzle 32.
  • a plurality of nozzles are arranged in a line and arranged along substantially the entire axial direction of the transfer roller 4 to discharge the glue substantially uniformly to the surface of the transfer roller 4, so that the glue liquid is applied to the glue liquid.
  • the drive is utilized.
  • the moving device can apply pressure to the glue in the reservoir 31 to drive the glue out of the nozzle 32.
  • the drive device includes a cylinder 33, a gas line 34, and a control valve 35.
  • the cylinder 33 communicates with the reservoir 31 to supply a gas pressure into the reservoir 31;
  • the gas pipe 34 communicates with the cylinder 33 to input a gas of an external source (not shown) into the cylinder 33, thereby storing
  • the liquid chamber 31 applies pressure to drive the glue out of the nozzle;
  • the control valve 35 is disposed on the air tube 34 to control the pressure in the cylinder 33.
  • each glue introduction unit further includes a positioning device 36 for positioning the entire glue introduction unit, and the positioning device 36 is mounted on the bracket 11.
  • the positioning device 36 includes, for example, a motor to drive the position of the corresponding glue introduction unit relative to the support table, such as a height.
  • the transfer roller 4 and the coating roller 5 may also be provided with respective positioning devices for adjusting the transfer roller 4, the coating roller 5 and the respective glue introduction units in cooperation with the positioning device 36 of the glue introduction unit. Relative positional relationship between them.
  • the control system further comprises an image processing device 7 for processing the image signal of the camera device 6 to obtain a distribution of glue, for example, the image processing device 7 is configured to filter out noise signals in the image signal.
  • Image denoising with median filtering requires the following steps: setting the filter module size, such as taking 5 ⁇ 5 modules; roaming the module in the image, and aligning the center of the module with a pixel in the image; Take the gray value of the corresponding pixel of the module; sort the gray values from small to large; find the middle one of these values as the mediation value; assign the mediation value to the corresponding template center pixel. At this time, the gray value difference of the surrounding pixels can be made to zero, thereby eliminating the isolated noise point.
  • the IMAQ Vision software can be used to perform median filtering on color images by extracting red, green, and blue color palettes from the original 32-bit image.
  • color pictures R, G, and B use a 32-bit color. Integer representation.
  • the median filtering process is performed on the red, green and blue palettes (8 bits) in RGB, respectively, to attenuate random noise while ensuring clear boundaries and ensuring fruit size characteristics.
  • the processed RGB palette then converts the original image with a corresponding bit operation to generate a new color image that is noise-removed.
  • the detecting device has a function of detecting the distribution of the glue and the coating pressure of the coating roller, that is, the pressure detecting and the coating state detecting can be realized, which has been described above with reference to FIG.
  • the distribution of the liquid controls the process of the discharge of the nozzle.
  • the package film coating system of the embodiment of the invention can also control the pressure of the coating roller. For example, the pressure of the coating roller on the display panel is detected by the detecting device. If the pressure is too large, the thickness of the applied glue is too small, and if the pressure is too small, the thickness of the applied glue is too large. . If the thickness is too large or too small, the coating effect on the glue is unfavorable.
  • control system further includes a photoelectric encoder to detect the position of the coating roller 5.
  • the control system also includes a piston position feedback unit to feed back the position of the piston in the reservoir to the controller.
  • the gas-driven piston acts as a pneumatic servo that can move within the reservoir.
  • the piston control system further includes an error upper limit setting unit to set an upper limit of error of a corresponding detection object such as a thickness and a plane size of the glue, a continuous distribution condition, whether or not a bubble is contained, a distribution state of the bubble, a coating pressure, and the like.
  • the controller controls the operating parameters such as the discharge amount of the glue or the height of the coating roller according to the type of the error.
  • the surface of the coating roller 5 is covered with a coating layer 51 made of a piezoelectric material, and the coating layer 51 is It is configured to control the amount of glue transferred onto the display panel 100.
  • the glue can be uniformly coated on the display substrate 100.
  • the coating layer 51 is provided with a concavo-convex pattern, and a controller such as the PLC 8 controls the concavo-convex pattern to produce a deformation that matches the pattern to be produced of the corresponding region of the display panel.
  • the controller may control a deformation state (eg, a concave-convex state) of the coating layer 51 made of a piezoelectric material, for example, when a corresponding region of the display panel 100 has a protrusion, the controller The coating layer 51 is controlled to cause deformation of the depression at a position corresponding to the position of the projection of the display panel 100; when the corresponding region of the display panel 100 has a depression, the controller controls the coating layer 51 to correspond to the position of the depression A convex deformation occurs at the position.
  • a deformation state eg, a concave-convex state
  • the coating layer 51 is controlled to cause deformation of the depression at a position corresponding to the position of the projection of the display panel 100; when the corresponding region of the display panel 100 has a depression, the controller controls the coating layer 51 to correspond to the position of the depression A convex deformation occurs at the position.
  • the encapsulation film coating system of the embodiment of the present invention can control the piezoelectrically variable coating layer to generate or eliminate the concavo-convex pattern corresponding to the corresponding region of each display panel according to the position of the corresponding region of the display panel to be coated.
  • the controller can control different concave and convex patterns to be generated to correspond to the surface structure of the display panel or the display substrate, thereby improving the uniformity of the glue coating. Sex.
  • the transfer roller can be applied to various types of display substrates to be coated.
  • different types of printed surface relief patterns can be produced by directly setting different parameters to the coating layer made of piezoelectric material.
  • a method of encapsulating a film of a display panel 100 using the package film coating system of any of the above embodiments is provided.
  • the method may include the steps of: fixing the display panel 100 on the support table 1; feeding the glue to the glue introduction device 3 by the glue storage device 2; uniformly applying the glue to the transfer by the glue introduction device 3
  • the absorbing layer of the transfer roller 4 can absorb the glue and the impurities in the glue, and further distribute the glue evenly through the microporous structure in which the inside communicates with each other; through the transfer roller 4
  • the glue is transferred onto the coating roller 5 with respect to the rotation of the coating roller 5, at this time, the absorbing layer 43 is also capable of adsorbing the impurities adhered to the coating roller 5; and the coating roller 5 and the display panel 100 The relative movement between the glues is applied to the display panel 100.
  • the absorbing layer 43 of the transfer roller 4 can uniformly absorb the glue from the glue introducing device 2, uniform distribution of the glue is achieved. While the transfer roller 4 and the coating roller 5 are relatively rotated to uniformly apply the glue on the transfer roller 4 to the coating roller 5, the absorbing layer 43 can adsorb the glue remaining on the surface of the coating roller 5. Or other impurities adhering to the surface of the coating roller that enter the absorbing particles located in the micropores. In this way, the coating roller can be effectively cleaned, and the coating roller can uniformly apply the glue on the display panel at the next coating, and effectively protect the coating material coated on the surface of the coating roller. Extend the service life of the coating material and reduce the number of times the coating material is replaced.
  • the glue is evenly applied to the transfer roller by the glue introduction device 3.
  • the step on the surface of 4 includes: detecting the distribution of the glue applied to the display panel 100; and controlling the adjustment of the glue discharged from the nozzle 32 of the glue introduction device 3 according to the respective conditions of the detected glue. the amount.
  • the distribution of the glue includes at least one of a thickness of the glue, a plane size, a continuous distribution of the glue, a presence or absence of bubbles, and a distribution of the bubbles. In this way, it is possible to avoid occurrence of defects such as bubbles, coating failure, and droplet accumulation, and it is possible to pass the coating quality on the display panel in which the glue is uniformly applied.
  • the step of detecting the distribution of the glue applied to the display panel 100 includes: acquiring an image signal regarding the glue on the display panel 100 by using the image pickup device 6; and imaging the image with the image processing device 7
  • the image signal acquired by the device 6 is processed to obtain a distribution of the glue solution, and the noise signal in the image signal is filtered out during processing of the image signal, thereby avoiding adverse effects of the re-review signal on the detection result, and improving The accuracy of the test results.
  • the edge portion relates to, for example, a portion where the color film substrate and the array substrate are bonded, and is subjected to more impact with respect to the central portion 102 located in the middle, the sealing property of the film formed at the edge portion 101 is made larger than that in the main body portion 102.
  • the formed film has high sealing property, reduces the possibility of breakage of the edge portion, and improves the sealing property of the edge portion.
  • such a configuration can be obtained by individually setting the operating parameters of each glue introduction unit.
  • the parameter of the glue introduction unit that applies the glue to the edge portion of the transfer roller 4 may be set to be different from the parameter of the glue introduction unit that applies the glue to the intermediate portion of the transfer roller 4.
  • a different or another glue may be provided for the glue introduction unit that applies the glue to the edge portion of the transfer roller 4.
  • the coating layer 51 made of a piezoelectric material of the coating roller 5 may be controlled to provide a glue having a different thickness on the display panel 100, such as an edge. The thickness of the part is greater.
  • the glue and the solution are discharged from at least one glue input unit on both sides
  • the physical properties of the glue discharged from the plurality of glue input units between the two sides are different, so that the glue applied to the edge portion 101 of the display panel 100 and the glue applied to the body portion 102 inside the edge portion are made.
  • the physical properties of the liquid are different.
  • the glue introduction device 3 may be disposed in a lateral direction (coating roller) The axial direction is moved on the bracket 11, and the operation of discharging the glue by the at least one glue input unit on both sides is performed after the completion of the discharge of the glue by the plurality of glue input units located between the both sides.
  • a plurality of glue input units between the two sides The glue is discharged simultaneously with at least one glue input unit located on both sides.
  • FIG. 7 is a pulse timing diagram of a coating operation phase, in accordance with an exemplary embodiment.
  • a coating operation phase is started at time t1, at which time the cylinder 33 is closed relative to the outside air; a pressurized gas, such as nitrogen, is delivered to the cylinder through the gas pipe 34, due to the inside of the reservoir 31
  • the glue is discharged from the nozzle 32 to the transfer roller 4 under pressure, and the transfer roller 4 transfers the glue to the coating roller; after a predetermined time A_TIME, the support table 1 moves relative to the coating roller 5, and starts. Coating operation.
  • the supply of nitrogen gas into the cylinder through the gas pipe 34 is stopped; the cylinder 33 is open to the outside air, and the pressure in the cylinder 33 is greater than the pressure of the outside air.
  • the balance valve is operated by suction valve, and the pressure in the cylinder 33 is negatively pressed with respect to the outside air by the suction valve, thereby sucking the liquid droplets suspended outside the nozzle 32 into the inside of the nozzle; after that, the support table stops moving.
  • the encapsulating film coating system, the transfer roller thereof, and the encapsulating film method, the transfer roller and the coating roller are relatively rotated to uniformly apply the glue on the transfer roller to the coating.
  • the absorbent layer is capable of adsorbing the glue remaining on the surface of the transfer roller or other impurities adhering to the surface of the coating roller.
  • the transfer roller can be effectively cleaned, and the transfer roller can uniformly separate the glue on the transfer roller at the next transfer, and effectively protect the coating material coated on the surface of the coating roller. Extend the service life of the coating material and reduce the number of times the coating material is replaced.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Coating Apparatus (AREA)
  • Engineering & Computer Science (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种转印滚轮(4)包括:筒体(42);吸收层(43),包覆在筒体(42)外部,吸收层(43)上设有许多与外部连通的微孔;以及转印层(45),包覆在吸收层(43)的外部,用于将胶液转印到涂布滚轮(5)上。所述转印层(45)上设有多个第一通孔,以允许胶液中的杂质进入到吸收层中的微孔中。一种使用该转印滚轮的封装胶膜涂布系统及封装胶膜的方法。该系统能够将胶液均匀地涂布在显示面板上。

Description

转印滚轮、封装胶膜涂布系统、及封装胶膜的方法 技术领域
本发明的实施例涉及一种封装胶膜涂布系统,尤其涉及一种用于封装显示装置的基板的封装胶膜涂布系统及其转印滚轮、和封装胶膜的方法。
背景技术
在显示器的领域中,有机电致发光二极管(Organic Light Emitting Diode(OLED))、以及主动矩阵有机发光二极管(Active Matrix Organic Light Emitting Diode(AMOLED))由于其具有主动发光、对比度高、能薄型化、响应速度快、制造设备的投资较小、制程较简单等特点,因此已广泛应用于平面显示器中。例如,OLED的发光原理是在两个电极之间积木式蒸镀若干层有机材料(包括有机发光材料),通过在两电极之间施加直流电压,使有机发光材料发光。
在OLED显示器中,有机发光材料遇水和遇氧容易失效,因而设置在其前面的玻璃基板必须加后盖板进行封装,以便隔绝水汽和氧气,延长显示器的使用寿命。OLED显示器常用金属盖板、玻璃盖板或薄膜进行封装。金属盖板与玻璃的膨胀系数不同,容易使整个显示装置变形,并且成本高。目前,通常采用玻璃盖板。基于OLED的制作过程,要求在玻璃盖板上刻蚀具有一定范围而且底部平整的多个凹槽,在凹槽内填装干燥剂,同时还有刻蚀高精度的对位标,以便与显示器的玻璃基板精准对位贴合。
目前,在这种玻璃盖板的制作过程中,先在用于形成基板的平板玻璃的前后表面涂覆较厚的抗刻蚀保护膜,然后在玻璃的其中一面用曝光的方式制作除出凹槽图案,经显影去除图案内的保护膜,将玻璃置于刻蚀液中刻蚀出凹槽,最后去除玻璃表面的保护膜。在这种制作过程中,需要采用高精度的曝光机,否则对位精度达不到封装要求,这样制造成本很高;特别是,保护膜与玻璃表 面的粘附力不足,容易脱落,造成大量缺陷,使制作成本进一步增加。
进一步地,由于涂布速度的要求,表面涂胶的均一度要求很高,因此需要提供一种能够实现高效涂胶、涂胶均一度高、并且涂布过程很精确的控制涂胶量的面涂胶设备。目前使用的点滴式涂胶方式,虽然涂布速度比较高,但涂胶均一性低,而且需要设置许多喷头,实现部件更换时需要很多时间。
发明内容
本发明的实施例提供一种封装胶膜涂布系统及其转印滚轮、和封装胶膜的方法,能够将胶液均匀地涂布在显示面板上。
根据本发明的一个方面,提供一种转印滚轮,包括:筒体;吸收层,包覆在所述筒体外部;以及转印层,包覆在所述吸收层的外部,用于将胶液转印到涂布滚轮上,其中,所述吸收层中设有许多微孔,所述转印层上设有多个第一通孔,所述第一通孔使所述微孔与转印滚轮外部连通。
根据转印滚轮的一个示例性实施例,所述吸收层包括:存储层,包覆在所述筒体上;和包裹层,包覆在所述存储层上以固定所述存储层,其中,所述微孔形成在所述储存层中,所述包裹层中设有多个第二通孔,所述第二通孔使所述微孔与所述第一通孔连通。
根据转印滚轮的另一示例性实施例,所述微孔的尺寸在径向向外的方向上逐渐变大。
根据转印滚轮的另一示例性实施例,所述微孔中设有吸收颗粒。
根据转印滚轮的另一示例性实施例,所述微孔中的吸收颗粒的尺寸在径向方向上从内向外逐渐变大。
根据本发明的另一个方面,提供了一种封装胶膜涂布系统,用于在显示面板上涂布胶液,该封装胶膜涂布系统包括:胶液存储装置,其被设置成用于提供胶液;胶液导入装置,其被设置成用于接收从胶液存储装置输出的胶液;如上述实施例中任一项所述的转印滚轮,其被设置成从所述胶液导入装置接收胶 液;以及涂布滚轮,其被设置成用于接收来自所述转印滚轮的胶液并将接收到的胶液涂布在显示面板上。
根据封装胶膜涂布系统的一个示例性实施例,封装胶膜涂布系统还包括设置在转印滚轮外侧附近的刮板,以刮除吸附在转印滚轮上的杂质或者残余胶液。
根据封装胶膜涂布系统的另一示例性实施例,所述胶液导入装置包括多个并排布置的胶液导入单元,每个胶液导入单元包括:储液室,设置成用于存储来自于胶液存储装置的胶液;喷嘴,与所述储液室连通,以向转印滚轮排出胶液;以及驱动装置,设置成用于将储液室中的胶液驱动到所述喷嘴中。
根据封装胶膜涂布系统的另一示例性实施例,所述驱动装置包括:气缸,与所述储液室连通,以向所述储液室中提供气体压力;气管,与所述气缸连通,以将外部气源的气体输入到所述气缸中;以及控制阀,设置在所述气管上,以控制所述气缸内的压力。
根据封装胶膜涂布系统的另一示例性实施例,所述驱动装置还包括:活塞,设置在所述储液室内,并且由来自于所述气管的气体驱动所述活塞移动,以推动胶液从喷嘴流出。
根据封装胶膜涂布系统的另一示例性实施例,所述封装胶膜涂布系统还包括控制系统,所述控制系统包括:检测装置,配置成用于检测已涂布在所述显示面板上的胶液的分布情况;以及控制器,配置成用于根据所检测的胶液的分别情况控制所述驱动装置,以调节从喷嘴排出的胶液的量。
根据封装胶膜涂布系统的另一示例性实施例,所述检测装置包括至少一个摄像装置,所述胶液的分布情况包括胶液的厚度和平面尺寸、连续部分状况、是否含有气泡以及气泡分布状况中的至少一种。
根据封装胶膜涂布系统的另一示例性实施例,所述检测装置进一步检测所述涂布滚轮的涂布压力。
根据封装胶膜涂布系统的另一示例性实施例,所述控制系统还包括图像处理装置,用于对所述摄像装置的图像信号进行处理以得到所述胶液的分布情况, 并且所述图像处理装置被配置成用于滤除所述图像信号中的噪声信号。
根据封装胶膜涂布系统的另一示例性实施例,所述涂布滚轮的表面覆盖由压电材料制成的涂布层,所述涂布层被构造成用于控制转印到显示面板上的胶液量。
根据封装胶膜涂布系统的另一示例性实施例,所述控制器还被配置成控制所述涂布层以产生与显示面板的相应区域的待产生的图案相匹配的形变。
根据封装胶膜涂布系统的另一示例性实施例,当显示面板的相应区域具有凸起时,所述控制器控制所述涂布层在与所述凸起的位置对应的位置处产生凹陷的形变;当显示面板的相应区域具有凹陷时,所述控制器控制所述涂布层在与所述凹陷的位置对应的位置处产生凸起的形变。
根据本发明的又一个方面,提供了一种利用上述封装胶膜涂布系统对显示面板封装胶膜的方法,其包括如下步骤:
由胶液存储装置向胶液导入装置输送胶液;
由胶液导入装置将胶液涂覆在转印滚轮的表面上;
通过转印滚轮将胶液转印到涂布滚轮上;以及
通过涂布滚轮将胶液涂布在显示面板上。
根据所述方法的一个示例性实施例,由胶液导入装置将胶液涂覆在转印滚轮的表面上的步骤包括:检测已涂布在显示面板上的胶液的分布情况;以及根据所检测的胶液的分别情况调节从胶液导入装置的喷嘴排出的胶液的量。
根据上述方法的另一示例性实施例,所述胶液的分布情况包括胶液的厚度、平面尺寸、连续分布状况、是否含有气泡以及气泡的分布状况中的至少一种。
根据所述方法的另一示例性实施例,检测已涂布在显示面板上的胶液的分布情况的步骤包括:利用摄像装置获取关于已涂布的胶液的分布情况的图像信号;和利用图像处理装置对所述摄像装置的图像信号进行处理以获得关于胶液分布情况的信息,其中,对图像信号进行的处理包括滤除所述图像信号中的噪声信号。
根据所述方法的另一示例性实施例,涂布在显示面板的边缘部分的胶液与涂布在边缘部分内侧的主体部分的胶液的物理性质不同,使得在边缘部分形成的胶膜的密封性比在主体部分形成的胶膜的密封性高。
根据所述方法的另一示例性实施例,所述物理性质包括胶液的浓度、厚度、和粘度中的至少一种。
根据所述方法的另一示例性实施例,位于转印滚轮的两侧部分的至少一个胶液输入单元排出的胶液与位于所述两侧部分之间的中间部分的多个胶液输入单元排出的胶液的物理性质不同。
根据所述方法的另一示例性实施例,在完成位于所述两侧部分之间的中间部分的多个胶液输入单元排出胶液之后再执行位于所述两侧部分的至少一个胶液输入单元排出胶液的操作。
根据所述方法的另一示例性实施例,位于所述两侧部分之间的中间部分的多个胶液输入单元和位于两侧部分的至少一个胶液输入单元同时排出胶液。
根据所述方法的另一示例性实施例,由胶液导入装置将胶液涂覆在转印滚轮的表面上的步骤包括:在胶液存储装置的每个胶液导入单元完成一个阶段的排出胶液的操作之后,将已露出所述胶液导入单元的喷嘴的胶液液滴吸入所述喷嘴内。
附图说明
为使本发明的目的、技术方案和优点更加清楚明白,以下结合具体实施例,并参照附图,对本发明作进一步的详细说明,其中:
图1是根据本发明的第一种示例性实施例的封装胶膜涂布系统的原理方框图;
图2是根据本发明的第一种示例性实施例的封装胶膜涂布系统的一种侧视图,图中未示出支撑台;
图3是根据本发明的第一种示例性实施例的封装胶膜涂布系统的另一种侧 视图,图中示出了支撑台;
图4是根据一种示例性实施例的转印滚轮的轴向方向上的侧视图;
图5是根据一种示例性实施例的一个胶液导入单元的原理示意图;
图6是根据本发明的第一种示例性实施例的封装胶膜涂布系统的控制原理方框图;
图7是根据一种示例性实施例的一个涂布操作阶段的脉冲时序图;
图8是根据一种示例性实施例的显示基板上的封胶膜布置方式的示意图;以及
图9是根据一种示例性实施例的利用控制系统控制胶液排出量的原理方框图。
具体实施方式
下面通过实施例,并结合附图,对本发明的技术方案作进一步具体的说明。在说明书中,相同或相似的附图标号指示相同或相似的部件。下述参照附图对本发明实施方式的说明旨在对本发明的总体发明构思进行解释,而不应当理解为对本发明的一种限制。
根据本发明总体上的发明构思,提供一种封装胶膜涂布系统,包括:支撑台,设置成用于承载将被封装的显示面板;胶液存储装置,用于提供胶液;胶液导入装置,安装在所述支撑台上,与胶液存储装置连接以接收从胶液存储装置输出的胶液;以及转印滚轮,设置成从所述胶液导入装置接收胶液。转印滚轮构造成用于将胶液导入涂布滚轮上,包括:筒体;吸收层,包覆在所述筒体外部,所述吸收层上设有许多与外部连通的微孔;以及转印层,包覆在所述吸收层的外部,用于将胶液转印到涂布滚轮上,其中,所述转印层上设有多个第一通孔,以允许胶液中的杂质进入到所述吸收层中的微孔中。
在下面的详细描述中,为便于解释,阐述了许多具体的细节以提供对本披露实施例的全面理解。然而明显地,一个或多个实施例在没有这些具体细节的情 况下也可以被实施。在其他情况下,公知的结构和装置以图示的方式体现以简化附图。
图1是根据本发明的第一种示例性实施例的封装胶膜涂布系统的原理方框图;图2是根据本发明的第一种示例性实施例的封装胶膜涂布系统的一种侧视图,图中未示出支撑台;图3是根据本发明的第一种示例性实施例的封装胶膜涂布系统的另一种侧视图,图中示出了支撑台。根据本发明一种示例性实施例的封装胶膜涂布系统用于向显示面板封装胶膜,例如,本发明的显示面板可以基于有机发光二极管(Organic Light Emitting Diode(OLED))、以及主动矩阵有机发光二极管(Active Matrix Organic Light Emitting Diode(AMOLED))显示面板,并包括对盒在一起的阵列基板和触摸基板,通过在显示面板的基板外部封装胶膜,可以防止例如水、水蒸气、氧气之类的外部杂质进入显示面板内部,从而使得显示面板内部的发光材料与外部物理隔绝,长期保持发光材料的性能稳定,延长显示面板的使用寿命。
参见图1-3,根据本发明一种示例性实施例的封装胶膜涂布系统包括:支撑台1、胶液存储装置2、胶液导入装置3、转印滚轮4和涂布滚轮5。支撑台1设置成用于承载并固定将被封装的显示面板100;胶液存储装置2用于提供胶液;胶液导入装置3例如通过导管与胶液存储装置2连接以接收从胶液存储装置2输出的胶液;转印滚轮4设置成从胶液导入装置2接收胶液;所述转印滚轮4将胶液均匀地传递到涂布滚轮5,涂布滚轮5将胶液涂布在显示面板100上。涂布在显示面板上的胶液凝固后形成封装胶膜,可以防止例如水、水蒸气、氧气、灰尘颗粒等不期望的物质从外部进入显示面板内部,从而使得显示面板内部的发光材料与外部物理隔绝。胶液存储装置2、胶液导入装置3、转印滚轮4和涂布滚轮5均可安装或固定在支架或框架11上。
如图3和4所示,转印滚轮4构造成用于将胶液导入涂布滚轮5上,并包括:安装在转轴41上的筒体42、吸收层和转印层45,吸收层包覆在筒体42外部,吸收层上设有许多与外部连通的微孔。
转印层45包覆在吸收层的外部,用于将胶液转印到涂布滚轮5上。转印层45上设有多个第一通孔,以允许胶液中的杂质进入到吸收层中的微孔中。例如,转印层45由柔软的细孔材料构成,能够与包裹层44紧密接触,以控制涂布在涂布滚轮5上的胶液量。这样,可以吸收胶液中的杂质,使转印涂布滚轮5上的胶液均匀地涂布在涂布滚轮上。而且,吸收层还可以吸收转印滚轮上多余的胶液。
在一种示例性实施例中,吸收层包括存储层43和包裹层44,其中,存储层43包覆在筒体42上,微孔形成在存储层中,以存储杂质和/或多余的胶液。包裹层44包覆在存储层43上以固定存储层43,包裹层44上设有多个第二通孔,以允许杂质被吸收到微孔中。所述微孔中设有吸收颗粒,以提高对杂质颗粒的吸附能力。在示例性的实施例中,所述第一通孔和第二通孔被构造成分别形成在转印层45和包裹层44中的众多的微孔。
根据本发明实施例的转印滚轮4和包括这种转印滚轮的封装胶膜涂布系统,由于转印滚轮4设置了吸收层和具有多个通孔的转印层,因此,多余的胶液以及胶液中的杂质能够穿过转印层中的通孔进入吸收层的微孔中,从而在转印层表面实现胶液的均匀分布。例如,吸收层的存储层43可以由聚胺乙酯、聚四氟乙烯、碳纳米管中的任何一种制成并形成类似泡沫结构。在转印滚轮4与涂布滚轮5相对转动以将转印滚轮4上的胶液均匀地涂布在涂布滚轮5上的同时,吸收层的存储层43能够通过转印层上的众多第一通孔和包裹层44上的众多第二通孔吸附胶液中的其它杂质或者多余的胶液,这些杂质将被位于微孔中的吸收颗粒吸附。
在一种示例性实施例中,存储层43中的微孔在径向方向上从内到外逐渐变大;吸收颗粒的尺寸在微孔中从内部到外部从小逐渐变大。这样,有利于杂质在微孔中在径向方向上向内部集中,从而容纳更多的杂质。
在一种示例性实施例中,转印滚轮4的转印层45外侧附近安装刮板46,转印滚轮4相对于刮板46旋转,刮板46刮除贴附在转印滚轮4上未进入转印 滚轮4内部的杂质或者残余的胶液。这样,能够对转印滚轮进一步进行有效清洁,确保转印滚轮在下一次转印时能够将胶液均匀地分布在转印滚轮5上,并有效保护包覆在涂布滚轮的表面上的涂布材料,延长涂布材料的使用寿命,减少更换涂布材料的次数。
例如,胶液存储装置2设置在支架上,可以设置数字显示系统,以能清楚地表明作业时的胶液的输入量并可根据作业情况及时地调节胶液量。涂布滚轮5将胶液涂布在显示面板100上的过程中,涂布滚轮5相对于显示面板100转动,显示面板100相对于涂布滚轮5移动,例如在图3中沿左-右方向配合涂布滚轮5的转动而移动,从而涂布滚轮5将胶液均匀地分布在显示面板100的上表面上。
在本发明的一种实施例中,如图1所示,胶液导入装置3、转印滚轮4和涂布滚轮5都安装在支架11上,支架11通过导轨12可相对于支撑台1可移动地安装在支撑台1上。在支架11上还设置有定位装置36,用于对胶液导入装置3、转印滚轮4和涂布滚轮5各自的位置或相对位置进行定位。定位装置36包括与胶液导入装置3、转印滚轮4和涂布滚轮5分别对应的多个电机。通过操作相应的电机,可以使胶液导入装置3、转印滚轮4和涂布滚轮5相对于支撑台在横向方向(涂布滚轮5的轴向方向)或者纵向方向上移动。在一种可替换的实施例中,支撑台1被设置成可以沿导轨移动,而支架11被设置成固定的。
参见图1-3和5,在一种示例性实施例中,胶液导入装置3包括多个并排布置的胶液导入单元,每个胶液导入单元包括储液室31、喷嘴32和驱动装置。储液室31设置成用于存储来自于胶液存储装置的胶液;喷嘴32与储液室31连通,以向转印滚轮4排出胶液;驱动装置设置成用于将储液室31中的胶液驱动到喷嘴32中。如图2所示,多个喷嘴排成一行,并沿转印滚轮4的大致整个轴向方向布置,以向转印滚轮4的表面基本均匀地排出胶液,使得胶液胶液涂覆在转印滚轮上。由于胶液具有粘性,而且喷嘴32的开口很小,利用驱 动装置可以向储液室31中的胶液施加压力,驱动胶液从喷嘴32流出。
在一种实施例中,驱动装置包括气缸33、气管34和控制阀35。气缸33与储液室31连通,以向储液室31中提供气体压力;气管34与所述气缸33连通,以将外部气源(未示出)的气体输入到气缸33中,从而向储液室31施加压力,驱动胶液从喷嘴流出;控制阀35设置在气管34上,以控制气缸33内的压力。进一步地,每个胶液导入单元还包括用于定位整个胶液导入单元的定位装置36,该定位装置36安装在支架11上。定位装置36例如包括电机,以驱动相应的胶液导入单元相对于支撑台的位置,例如高度。另外,转印滚轮4和涂布滚轮5也可以设有各自的定位装置,以与胶液导入单元的定位装置36相配合地调整转印滚轮4、涂布滚轮5与各胶液导入单元之间的相对位置关系。
进一步地,驱动装置还包括:活塞(未示出),活塞设置在储液室31内,并且由来自于气管34的气体驱动气缸移动,以推动胶液从喷嘴32排出。在由气体直接与胶液接触并驱动胶液的情况下,可以提高响应速度,但由于胶液自身的粘性,位于储液室管壁附近的胶液趋于粘附中管壁上,从而使得位于中心的胶液容易被推动,造成从喷嘴排出的胶液不均匀。在设置活塞的情况下,活塞与胶液接触并推动胶液,使得胶液的受力均匀,可以从喷嘴均匀排出,但降低了响应速度,在气体压力变动时,会产生滞后现象。
在本发明的实施例中,利用带压的气体,例如氮气作为驱动介质驱动胶液从喷嘴32排出,可以简化整个胶液导入装置的结构。在可替换的实施例中,可以采用压电致动器驱动胶液,还可以采用由电机驱动的活塞或凸轮驱动胶液。可以根据实际情况选择驱动装置,本发明不作限定。
参见图1和6,根据本发明的一种示例性实施例的封装胶膜涂布系统还包括控制系统,所述控制系统包括:检测装置和控制器,其中检测装置配置成用于检测已涂布在显示面板100上的胶液的分布情况;例如可编程逻辑控制器8(PLC)之类的控制器配置成用于根据所检测的胶液的分别情况控制驱动装置,以调节从喷嘴32排出的胶液的量。通过控制器可以控制胶液喷出的量和排出 时机,例如采用类似医用点滴方式从喷嘴32排出胶液,可独立控制每个喷嘴处的排出量,且可以通过定位装置36(图5)自行调节相邻胶液导入单元之间的间距。这样,能够避免例如气泡、涂布失败、液滴聚积等缺陷的发生,可以使胶液均匀地涂布的显示面板上,通过涂布质量。
参见图6,在一种示例性实施例中,检测装置包括至少一个摄像装置6,例如设置三个红外摄像装置。可以根据需要调节三个摄像装置6之间的位置关系、以及每个摄像装置与支撑台之间的位置关系。胶液的分布情况包括胶液的厚度、平面尺寸、连续分布状况(胶液层是否连续或存在中断等情况)、是否含有气泡、以及气泡的分布状况中的至少一种。进一步地,可以通过检测装置进一步检测涂布滚轮5的涂布压力。例如,根据摄像装置6获得的涂布滚轮5与支撑台1上的显示面板之间的距离,确定涂布压力。
控制系统还包括图像处理装置7,用于对摄像装置6的图像信号进行处理以得到胶液的分布情况,例如,图像处理装置7被配置成用于滤除图像信号中的噪声信号。
在利用摄像装置进行拍摄时,所获取的图像中可能带有噪声干扰。噪声易恶化图像的质量,模糊图像,淹没图像特征,给图像分析带来困难。图像噪声产生的主要原因是来源于图像的采集和传输过程中环境的扰动以及人为的因素。在图像处理过程中,由于采集过程中受到各种噪声源影响,在图像上常常会出现一些孤立的像素点。这些像素点与相邻像素点有显著不同,干扰了图像采集效果。如不进行滤波,将对以后的图像区域分割、分析、处理带来影响。例如,采用线性滤波器能够较好的消除图像采集中噪声干扰问题。
在本发明的一种示例性实施例中,采用一种基于高效的中值滤波图像处理算法消除图像中的噪声,效地抑制噪声,滤除脉冲干扰和图像扫描噪声,同时避免了线性滤波器带来的图像细节模糊,并保留了边缘信息。
在图像处理中的中值定义为:一组数X1,X2,X3,......Xn(X1≤X2≤X3......≤Xn),把这n个数按值大小顺序排列如下:
Figure PCTCN2015075500-appb-000001
其中y为序列X1,X2,X3,......Xn的中值。
用中值滤波进行图像去噪声处理需要以下几个步骤:设定滤波器模块大小,如取5×5模块;将模块在图像中漫游,并将模块中心与图像中某一像素位置重合;读取模块下个对应像素的灰度值;将这些灰度值从小到大排序;找出这些值中中间一个作为中介值;将中介值赋给对应模板中心像素。这时就可以使周围像素的灰度值差趋于零,从而消除孤立噪声点。
利用IMAQ Vision软件可以将彩色图像进行中值滤波处理,方法为:从原始32位图像中,抽取红、绿、蓝三色调色板,在IMAQ Vision中彩色图片R、G、B用一个32位整数表示。分别对RGB中,红、绿、蓝调色板(8位)进行中值滤波处理,衰减随机噪声的同时保证边界清楚,确保水果尺寸特征。处理后的RGB调色板再用相应位运算将原始图像进行转换,生成去除噪声的新的彩色图像。
为获取显示面板100上的某个位置的图像,可以设置照明装置。照明装置例如采用显色性强、发光强、功耗低、散热小、光谱范围及寿命高的LED作为光源。
在对图像信号进行处理后,获得关于显示面板上的胶液的分布情况,如发现存在缺陷,例如厚度不均匀、存在气泡,则由可编程逻辑控制器(PLC)8向控制阀35发出相应的控制指令,改变控制阀35的开度,例如加大或者减少来自于气源(未示出)的压缩气体的量,提高或者降低气缸33中的压力,从而控制从喷嘴32排出的胶液量。在储液室中设置活塞的情况下,通过改变气缸33中的压力,可以改变活塞的位置,进而由活塞推动胶液排出喷嘴。
如图9所示,检测装置具有检测胶液的分布情况和涂布滚轮的涂布压力的功能,即可以实现压力检测和涂布状态检测,上文已经结合图9描述了根据胶 液的分布情况控制喷嘴的排出量的过程。本发明实施例的封装胶膜涂布系统还可以控制涂布滚轮的压力。例如,由检测装置检测涂布滚轮对显示面板的压力,如果压力太大,则容易导致涂布的胶液的厚度太小,而压力太小,则容易导致涂布的胶液的厚度太大。厚度太大或者太小,对胶液的涂布效果都是不利的。例如,在检测装置检测到胶液厚度太大的情况下,可编程逻辑控制器将向定位装置的电机发出指令,以通过定位装置的运动减小涂布滚轮相对于显示面板的高度,使得涂布滚轮对现实面板施加的压力增大,进而降低胶液的厚度。
进一步地,如图9所示,控制系统还包括光电编码器,以检测涂布滚轮5的位置。控制系统还包括活塞位置反馈单元,以将储液室中的活塞的位置反馈到控制器中。在此情况下,由气体推动的活塞用做一个气动伺服装置,可以在储液室内移动。活塞控制系统还包括误差上限设定单元,以设定相应检测对象例如胶液的厚度和平面尺寸、连续分布状况、是否含有气泡以及气泡的分布状况、涂布压力等的误差上限,当所述检测对象超出预定的误差上限值时,则由控制器根据误差的类型相应地控制胶液的排出量或者涂布滚轮的高度等工作参数。
根据本发明的一种实施例的封装胶膜涂布系统,如图1和3所示,涂布滚轮5的表面覆盖由压电材料制成的涂布层51,所述涂布层51被构造成用于控制转印到显示面板100上的胶液量。这样,可以使胶液均匀地涂布在显示基板100上。涂布层51上设有凹凸图案,例如PLC 8之类的控制器控制凹凸图案产生与显示面板的相应区域的待产生的图案相匹配的形变。
在一种示例性实施例中,控制器可以控制由压电材料制成的涂布层51的形变状态(例如,凹凸状态),例如,当显示面板100的相应区域具有凸起时,控制器控制涂布层51以在与显示面板100的凸起的位置对应的位置处产生凹陷的形变;当显示面板100的相应区域具有凹陷时,控制器控制涂布层51以在与凹陷的位置对应的位置处产生凸起的形变。这样,可以根据显示面板100的表面的凹凸形状,在涂布层51上形成相匹配的凹凸形状以涂布胶液,从而 提高胶液涂布的均匀性。
本发明实施例的封装胶膜涂布系统能够根据待涂布的显示面板的相应区域的位置,控制压电可变的涂布层产生或消除与各显示面板的相应区域对应的凹凸图案。例如,利用控制器通过对压电可变的涂布层设定不同的参数,可以使其产生不同的凹凸图案,以与显示面板或显示基板的表面结构相对应,提高胶液涂布的均匀性。这样,可以使转印滚轮能够适用于多种型号的待涂布的显示基板。例如,针对不同型号的待涂布的显示基板,直接通过对由压电材料制成的涂布层设定不同的参数就可以实现产生不同类型的印刷表面凹凸图案。
根据本发明进一步发明的实施例,参见图1-6和9,提供了一种利用上述任一实施例所述的封装胶膜涂布系统对显示面板100封装胶膜的方法。该方法可包括如下步骤:将显示面板100固定在支撑台1上;由胶液存储装置2向胶液导入装置3输送胶液;由胶液导入装置3将胶液均匀地涂覆在转印滚轮4的表面上,此时,转印滚轮4的吸收层能够吸收胶液以及胶液中的杂质,并通过其内部相互连通的微孔结构使胶液的分布进一步均匀;通过转印滚轮4相对于涂布滚轮5的转动将胶液转印到涂布滚轮5上,此时,吸收层43还能够吸附粘附在涂布滚轮5上的杂质;以及通过涂布滚轮5与显示面板100之间的相对移动,将胶液涂布在显示面板100上。
根据本发明实施例的对显示面板100封装胶膜的方法,由于转印滚轮4的吸收层43能够均匀地吸收来自于胶液导入装置2的胶液,实现胶液的均匀分布。在转印滚轮4与涂布滚轮5相对转动以将转印滚轮4上的胶液均匀地涂布在涂布滚轮5上的同时,吸收层43能够吸附涂布滚轮5表面上存留的胶液或者粘附在涂布滚轮表面上的其它杂质,这些杂质进入到位于微孔中的吸收颗粒上。这样,能够对涂布滚轮进行有效清洁,确保涂布滚轮在下一次涂布时能够将胶液均匀地涂布在显示面板上,并有效保护包覆在涂布滚轮的表面上的涂布材料,延长涂布材料的使用寿命,减少更换涂布材料的次数。
在一种示例性实施例中,由胶液导入装置3将胶液均匀地涂覆在转印滚轮 4的表面上的步骤包括:检测已涂布在显示面板100上的胶液的分布情况;以及根据所检测的胶液的分别情况控制调节从胶液导入装置3的喷嘴32排出的胶液的量。例如,所述胶液的分布情况包括胶液的厚度、平面尺寸、胶液连续分布状况、是否含有气泡以及气泡的分布状况中的至少一种。这样,能够避免例如气泡、涂布失败、液滴聚积等缺陷的发生,可以使胶液均匀地涂布的显示面板上,通过涂布质量。
在一种实施例中,检测已涂布在显示面板100上的胶液的分布情况的步骤包括:利用摄像装置6获取关于显示面板100上的胶液的图像信号;利用图像处理装置7对摄像装置6获取的图像信号进行处理以得到所述胶液的分布情况,并且在对图像信号进行处理过程中滤除所述图像信号中的噪声信号,从而避免再审信号对检测结果的不利影响,提高检测结果的准确性。
在一种实施例中,参见图8和2,在将胶液涂布在所述显示面板100上的步骤中,涂布在显示面板100的边缘部分101的胶液与涂布在边缘部分内侧的主体部分102的胶液的物理性质不同,使得在边缘部分101形成的胶膜的密封性比在主体部分102形成的胶膜的密封性高。例如,所述物理性质包括胶液的浓度、厚度、和粘度中的至少一种。边缘部分101的胶液和主体部分102的胶液可以是相同的,也可以是不同的。由于边缘部分涉及到例如彩膜基板和阵列基板结合的部位,而且相对于位于中间的主体部分102受到较多的冲击,因此通过使得在边缘部分101形成的胶膜的密封性比在主体部分102形成的胶膜的密封性高,减少边缘部分破损的可能性,可以提高边缘部分的密封性。例如,这种构造可通过对每个胶液导入单元的工作参数进行单独设定而获得。其中,可将向转印滚轮4的边缘部分涂敷胶液的胶液导入单元的参数设置成与向转印滚轮4的中间部分涂敷胶液的胶液导入单元的参数不同。在另一示例性实施例中,可针对向转印滚轮4的边缘部分涂敷胶液的胶液导入单元提供不同的或另一种胶液。在另一示例性实施例中,可通过对涂布滚轮5的由压电材料制成的涂布层51进行控制以在显示面板100上提供具有不同厚度的胶液,例如边缘 部分的厚度更大。
在一种示例性实施例中,由胶液导入装置3将胶液均匀地涂覆在转印滚轮4的表面上的步骤中,位于两侧的至少一个胶液输入单元排出的胶液与位于所述两侧之间的多个胶液输入单元排出的胶液的物理性质不同,从而使得涂布在显示面板100的边缘部分101的胶液与涂布在边缘部分内侧的主体部分102的胶液的物理性质不同。在一种实施例中,在由布置成一行的多个胶液导入单元的总宽度小于显示面板100的宽度的情况下,可以将胶液导入装置3设置成可以沿横向方向(涂布滚轮的轴向方向)在支架11上移动,并且在完成位于所述两侧之间的多个胶液输入单元排出胶液之后再执行位于两侧的至少一个胶液输入单元排出胶液的操作。在一种可替换的实施例中,在由布置成一行的多个胶液导入单元的总宽度大致等于显示面板100的宽度的情况下,位于所述两侧之间的多个胶液输入单元和位于两侧的至少一个胶液输入单元同时排出胶液。
在本发明的一种示例性实施例中,由胶液导入装置3将胶液均匀地涂覆在转印滚轮4的表面上的步骤包括:在胶液导入装置3的每个胶液导入单元完成一个阶段的排出胶液的操作之后,已露出胶液导入单元的喷嘴32的胶液液滴被吸入所述喷嘴内。这样,在完成一个阶段的涂布操作之后,液滴吸入喷嘴32而不会滴落到显示面板100上,避免了在显示面板100上出现多余的液滴,也表面了悬挂在喷嘴32外部的液滴固化。
图7是根据一种示例性实施例的一个涂布操作阶段的脉冲时序图。参见图1-3、5和7,在t1时刻开始一个涂布操作阶段,此时气缸33相对于外部空气关闭;通过气管34向气缸内输送带压气体,例如氮气,储液室31内由于受到压力而从喷嘴32排出胶液到转印滚轮4,转印滚轮4再将胶液转印到涂布滚轮上;在预定的时间A_TIME之后,支撑台1相对于涂布滚轮5移动,开始涂布操作。如果需要在t2时刻停止一个涂布操作阶段,停止通过气管34向气缸内输送氮气;气缸33相对于外部空气开放,气缸33内的压力与外部空气压力大 致平衡;抽吸阀操作,利用抽吸阀将气缸33内的压力相对于外部空气为负压,从而将悬挂在喷嘴32外部的胶液液滴吸入到喷嘴内部;之后支撑台停止移动。
根据本发明上述实施例的封装胶膜涂布系统及其转印滚轮、和封装胶膜方法,在转印滚轮与涂布滚轮相对转动以将转印滚轮上的胶液均匀地涂布在涂布滚轮上的同时,吸收层能够吸附转印滚轮表面上存留的胶液或者粘附在涂布滚轮表面上的其它杂质。这样,能够对转印滚轮进行有效清洁,确保转印滚轮在下一次转印时能够将胶液均匀地分别在转印滚轮上,并有效保护包覆在涂布滚轮的表面上的涂布材料,延长涂布材料的使用寿命,减少更换涂布材料的次数。另外,涂布滚轮与显示基板同步运行,可有效地清洁显示基板的用于形成封装胶膜的胶液涂布时表面残留的胶液,并且胶液能够得到均匀地吸收,能简洁清楚地调节胶液的涂布流量,不会造成由于胶液流入过多而使得用于形成封装胶膜的胶液涂布不均现象,避免了涂布过程中残留胶液清洁不便的现象。
以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (27)

  1. 一种转印滚轮,包括:
    筒体;
    吸收层,包覆在所述筒体外部;以及
    转印层,包覆在所述吸收层的外部,用于将胶液转印到涂布滚轮上,
    其中,所述吸收层中设有许多微孔,所述转印层上设有多个第一通孔,所述第一通孔使所述微孔与转印滚轮外部连通。
  2. 如权利要求1所述的转印滚轮,其中,所述吸收层包括:
    存储层,包覆在所述筒体上;和
    包裹层,包覆在所述存储层上以固定所述存储层,
    其中,所述微孔形成在所述储存层中,所述包裹层中设有多个第二通孔,所述第二通孔使所述微孔与所述第一通孔连通。
  3. 如权利要求2所述的转印滚轮,其中,所述微孔的尺寸在径向向外的方向上逐渐变大。
  4. 如权利要求1-3中任一项所述的转印滚轮,其中,所述微孔中设有吸收颗粒。
  5. 如权利要求4所述的转印滚轮,其中,所述微孔中的吸收颗粒的尺寸在径向方向上从内向外逐渐变大。
  6. 一种封装胶膜涂布系统,用于在显示面板上涂布胶液,该封装胶膜涂布系统包括:
    胶液存储装置,其被设置成用于提供胶液;
    胶液导入装置,其被设置成用于接收从胶液存储装置输出的胶液;
    如权利要求1-5中任一项所述的转印滚轮,其被设置成从所述胶液导入装置接收胶液;以及
    涂布滚轮,其被设置成用于接收来自所述转印滚轮的胶液并将接收到的胶液涂布在显示面板上。
  7. 如权利要求6所述的封装胶膜涂布系统,还包括设置在转印滚轮外侧附近的刮板,以刮除吸附在转印滚轮上的杂质或者残余胶液。
  8. 如权利要求6所述的封装胶膜涂布系统,其中,所述胶液导入装置包括多个并排布置的胶液导入单元,每个胶液导入单元包括:
    储液室,设置成用于存储来自于胶液存储装置的胶液;
    喷嘴,与所述储液室连通,以向转印滚轮排出胶液;以及
    驱动装置,设置成用于将储液室中的胶液驱动到所述喷嘴中。
  9. 如权利要求8所述的封装胶膜涂布系统,其中,所述驱动装置包括:
    气缸,与所述储液室连通,以向所述储液室中提供气体压力;
    气管,与所述气缸连通,以将外部气源的气体输入到所述气缸中;以及
    控制阀,设置在所述气管上,以控制所述气缸内的压力。
  10. 如权利要求8所述的封装胶膜涂布系统,其中,所述驱动装置还包括:
    活塞,设置在所述储液室内,并且由来自于所述气管的气体驱动所述活塞移动,以推动胶液从喷嘴流出。
  11. 如权利要求8-10中任一项所述的封装胶膜涂布系统,还包括控制系统,所述控制系统包括:
    检测装置,配置成用于检测已涂布在所述显示面板上的胶液的分布情况;以及
    控制器,配置成用于根据所检测的胶液的分别情况控制所述驱动装置,以调节从喷嘴排出的胶液的量。
  12. 如权利要求11所述的封装胶膜涂布系统,其中,所述检测装置包括至少一个摄像装置,所述胶液的分布情况包括胶液的厚度和平面尺寸、连续部分状况、是否含有气泡以及气泡分布状况中的至少一种。
  13. 如权利要求12所述述的封装胶膜涂布系统,其中,所述检测装置进一步检测所述涂布滚轮的涂布压力。
  14. 如权利要求12所述述的封装胶膜涂布系统,其中,所述控制系统还 包括图像处理装置,用于对所述摄像装置的图像信号进行处理以得到所述胶液的分布情况,
    所述图像处理装置被配置成用于滤除所述图像信号中的噪声信号。
  15. 如权利要求11所述的封装胶膜涂布系统,其中,所述涂布滚轮的表面覆盖由压电材料制成的涂布层,所述涂布层被构造成用于控制转印到显示面板上的胶液量。
  16. 如权利要求15所述的封装胶膜涂布系统,其中,所述控制器还被配置成控制所述涂布层以产生与显示面板的相应区域的待产生的图案相匹配的形变。
  17. 如权利要求16所述的封装胶膜涂布系统,其中,当显示面板的相应区域具有凸起时,所述控制器控制所述涂布层在与所述凸起的位置对应的位置处产生凹陷的形变;当显示面板的相应区域具有凹陷时,所述控制器控制所述涂布层在与所述凹陷的位置对应的位置处产生凸起的形变。
  18. 一种利用权利要求6-17中任一项所述的封装胶膜涂布系统对显示面板封装胶膜的方法,包括如下步骤:
    由胶液存储装置向胶液导入装置输送胶液;
    由胶液导入装置将胶液涂覆在转印滚轮的表面上;
    通过转印滚轮将胶液转印到涂布滚轮上;以及
    通过涂布滚轮将胶液涂布在显示面板上。
  19. 如权利要求18所述的对显示面板封装胶膜的方法,其中,由胶液导入装置将胶液涂覆在转印滚轮的表面上的步骤包括:
    检测已涂布在显示面板上的胶液的分布情况;以及
    根据所检测的胶液的分别情况调节从胶液导入装置的喷嘴排出的胶液的量。
  20. 如权利要求19所述的对显示面板封装胶膜的方法,其中,所述胶液的分布情况包括胶液的厚度、平面尺寸、连续分布状况、是否含有气泡以及气 泡的分布状况中的至少一种。
  21. 如权利要求19或20所述的对显示面板封装胶膜的方法,其中,检测已涂布在显示面板上的胶液的分布情况的步骤包括:
    利用摄像装置获取关于已涂布的胶液的分布情况的图像信号;和
    利用图像处理装置对所述摄像装置的图像信号进行处理以获得关于胶液分布情况的信息,
    其中,对图像信号进行的处理包括滤除所述图像信号中的噪声信号。
  22. 如权利要求18所述的对显示面板封装胶膜的方法,其中,涂布在显示面板的边缘部分的胶液与涂布在边缘部分内侧的主体部分的胶液的物理性质不同,使得在边缘部分形成的胶膜的密封性比在主体部分形成的胶膜的密封性高。
  23. 如权利要求22所述的对显示面板封装胶膜的方法,其中,所述物理性质包括胶液的浓度、厚度、和粘度中的至少一种。
  24. 如权利要求22所述的对显示面板封装胶膜的方法,其中,位于转印滚轮的两侧部分的至少一个胶液输入单元排出的胶液与位于所述两侧部分之间的中间部分的多个胶液输入单元排出的胶液的物理性质不同。
  25. 如权利要求24所述的对显示面板封装胶膜的方法,其中,在完成位于所述两侧部分之间的中间部分的多个胶液输入单元排出胶液之后再执行位于所述两侧部分的至少一个胶液输入单元排出胶液的操作。
  26. 如权利要求24所述的对显示面板封装胶膜的方法,其中,位于所述两侧部分之间的中间部分的多个胶液输入单元和位于两侧部分的至少一个胶液输入单元同时排出胶液。
  27. 如权利要求24所述的对显示面板封装胶膜的方法,其中,由胶液导入装置将胶液涂覆在转印滚轮的表面上的步骤包括:
    在胶液存储装置的每个胶液导入单元完成一个阶段的排出胶液的操作之后,将已露出所述胶液导入单元的喷嘴的胶液液滴吸入所述喷嘴内。
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