WO2016184135A1 - Dispositif et procédé de remplissage d'encre pour dispositif d'affichage à électro-mouillage - Google Patents

Dispositif et procédé de remplissage d'encre pour dispositif d'affichage à électro-mouillage Download PDF

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Publication number
WO2016184135A1
WO2016184135A1 PCT/CN2016/070362 CN2016070362W WO2016184135A1 WO 2016184135 A1 WO2016184135 A1 WO 2016184135A1 CN 2016070362 W CN2016070362 W CN 2016070362W WO 2016184135 A1 WO2016184135 A1 WO 2016184135A1
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WO
WIPO (PCT)
Prior art keywords
ink
display
filling
pixel
region
Prior art date
Application number
PCT/CN2016/070362
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English (en)
Chinese (zh)
Inventor
周国富
蒋洪伟
郭媛媛
海耶斯罗伯特·安德鲁
周蕤
Original Assignee
深圳市国华光电科技有限公司
华南师范大学
深圳市国华光电研究院
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Application filed by 深圳市国华光电科技有限公司, 华南师范大学, 深圳市国华光电研究院 filed Critical 深圳市国华光电科技有限公司
Publication of WO2016184135A1 publication Critical patent/WO2016184135A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements

Definitions

  • the present invention relates to the field of electrowetting display preparation technology, and more particularly to an apparatus and method for filling ink into a pixel grid of a display substrate of an electrowetting display.
  • Electrowetting (EFD, Electrofluidic Display), also known as electrowetting, is a display technique that controls the variation of pixels by controlling the voltage to control the surface layer of the enclosed liquid.
  • the electrowetting display structure mainly comprises a first conductive plate 1 and a second conductive plate 3 disposed opposite to each other, and between the first conductive plate 1 and the second conductive plate 3
  • the first conductive plate 1 is further provided with a package plastic frame 2, and the first conductive plate 1 and the package plastic frame 2 constitute an upper substrate of the electrowetting display.
  • the insulating layer 4 is covered on the second conductive plate 3.
  • the hydrophobic layer 5 is covered on the insulating layer 4 and has a flat surface.
  • a plurality of pixel walls 6 are disposed on the flat surface of the hydrophobic layer 5, made of a hydrophilic material, and the area between the pixel walls is the pixel grid 9.
  • the second conductive plate 3, the insulating layer 4, the hydrophobic layer 5, and the pixel wall 6 constitute a lower substrate of the electrowetting display, that is, a display substrate.
  • the first fluid 7 and the second fluid 8 are two mutually incompatible conductive fluids, the second fluid 8 is an electrolyte solution, the first fluid 7 is an ink, and the first fluid 7 is filled in the adjacent pixel wall 6 of the display area.
  • the display effect is achieved by applying a voltage to drive the spreading and contraction of the ink. Robert A. Hayes et al.
  • the display device described in the article when no voltage is applied, the ink spreads over the surface of the hydrophobic layer, showing the color of the ink. When a voltage is applied, the ink shrinks, showing the color of the lower substrate.
  • the filling method of the conventional liquid crystal is no longer suitable for the filling of the ink and the electrolyte solution material of the electrowetting display.
  • the main pixel filling method mainly utilizes the lipophilic layer of the water layer in the pixel region. Hydrophobic, when the hydrophobic layer is in contact with the dyed ink, the ink spreads over the surface of the hydrophobic layer and is blocked by the hydrophilic pixel wall while the ink is covered by the electrolyte solution.
  • the liquid-filling method described in A1 describes an apparatus for filling ink, which is composed of a hard plexiglass material, and the length is determined according to the length of the display panel. There is a groove in the middle, and the ink injection device is connected to the groove. When filling, the filling head portion is close to the substrate below the liquid surface. When the distance is 1 micrometer, the injection ink forms oil droplets at the grooves thereof, and the oil droplets are filled into the pixel points when approaching the substrate, and the reciprocating motion of the filling head portion is achieved. Fill the purpose evenly.
  • the method has certain difficulty in filling a large-area display, and the parallelism of the filling head and the substrate is very high, and as the display area increases, the distance of the filling head portion from the display substrate is gradually reduced to ensure the thickness of the filling ink. And uniformity, technical difficulty.
  • This method requires a large amount of ink to be formed in the container, so the demand for ink is large and the control of the amount of ink needs to be very precise. At the same time, there is no way to ensure the concentration of the ink during the filling process due to the volatility of the ink solvent. Consistency, and the filling speed is slow, and the size of the container limits the size of the display substrate.
  • Taiwan Jiaotong University of China proposed to use inkjet printing method to fill the ink in the pixel grid, then cover the ink above the ink and complete the packaging of the display device with ITO glass.
  • the accuracy of the filling device has its own limitations for preparing a high-resolution electrowetting display device, and cannot meet the requirements of precision filling a small-sized pixel device, and the filling process takes a long time.
  • the present invention provides an ink filling method and apparatus for uniformly filling ink.
  • An ink filling method for an electrowetting display comprising a display substrate having pixel cells separated by a pixel wall in an entire display area of the display substrate, the method for filling ink into the pixel cells Specifically, the steps include the following steps:
  • the oil film to be transferred of the carrier is in contact with a portion of the display substrate having a pixel grid, so that the ink coated on the carrier is transferred into the pixel grid to achieve ink filling.
  • the carrier is a round roller that can be rotated.
  • the display substrate is conveyed by the transmission device in contact with the rolling roller so that the oil film to be transferred formed on the roller is transferred into the pixel of the display region of the display substrate.
  • the speed at which the transmission conveys the display substrate is the same as the linear speed at which the roller is rotated, so that the oil film to be transferred in the contact process corresponds to the position of the display region during the contact.
  • the ink is coated and transferred to fill with the carrier immersed in the electrolyte solution.
  • the round roll has two portions of a lipophilic hydrophobic region and a hydrophilic region, the round roller is first immersed in the electrolyte solution, and after the hydrophilic region is covered by the electrolyte solution, The oleophilic hydrophobic region not covered by the electrolyte solution film is coated with an ink to form an oil film to be transferred.
  • the ink is applied to the lipophilic hydrophobic region by the ink supply device by the rotation of the round roller.
  • An ink filling apparatus for an electrowetting display for filling ink into a pixel grid of a display area of an electrowetting display substrate, the apparatus comprising:
  • An ink transfer carrier having at least one lipophilic hydrophobic region that matches a display area of the electrowetting display substrate to be filled;
  • An ink supply device for applying ink to an oleophilic hydrophobic region
  • the lipophilicity of the lipophilic hydrophobic region is lower than the lipophilicity of the hydrophobic layer in the pixel, and the lipophilic hydrophobic region of the carrier and the display region of the display substrate to be filled with the electrowetting display can be phased Contacting thereby transferring the ink coated with the lipophilic hydrophobic region into the pixel grid of the display area of the display substrate.
  • the ink transfer carrier is a pivotable round roller mounted in the ink filling apparatus.
  • the apparatus further includes a transmission for conveying a display substrate to be filled with the electrowetting display, the transmission being located below the round roller, the display substrate filling the electrowetting display being The transmission can be in contact with the oleophilic hydrophobic region of the round roll during movement.
  • the transmission device is a plurality of rolling shafts arranged in parallel with the rotation axis of the circular roller.
  • a case which can be used to hold an electrolyte solution, and the ink transfer carrier, the ink supply device can be immersed in the electrolyte solution contained in the case.
  • the casing is divided into three parts, a feeding zone, a filling zone and a packaging zone, from front to back, the feeding zone is for placing a display substrate, and the filling zone is used for coating the ink. And transfer, the encapsulation area is used for encapsulation and collection of electrowetting displays.
  • the ink supply device is located at the top of the round roller, and the ink-repellent hydrophobic region is ink-coated by the ink supply device as it rotates to the topmost position with the round roller.
  • the ink supply device includes a container having an elongated slit and a micro pump for pumping ink.
  • the filling apparatus further includes a substrate ink cleaning device having an oleophilic hydrophobic region, and the lipophilicity of the lipophilic hydrophobic region is weaker than the lipophilicity of the hydrophobic layer in the pixel.
  • the substrate ink cleaning device is a round roll having an oleophilic hydrophobic region thereon.
  • the present invention provides an ink filling device and method for an electrowetting display.
  • the carrier having the oleophilic hydrophobic property is coated with an ink to form at least an oil film to be transferred which matches the size of the display region of the display substrate, wherein the carrier is weaker than the lipophilicity of the hydrophobic layer in the pixel;
  • the oil film to be transferred of the carrier is in contact with the portion of the display substrate having the pixel grid, so that the ink coated on the carrier is transferred into the pixel grid to achieve ink filling.
  • the method is used for ink filling of the electrowetting display, the filling ink is uniform, the controllability is good, the filling speed is fast, and it is suitable for mass production.
  • Figure 1a is a block diagram of an electrowetting display.
  • Figure 1b is a block diagram of a substrate on an electrowetting display.
  • Figure 1c is a structural view of a display substrate of an electrowetting display.
  • FIG. 2 is a schematic diagram of a pixel wall structure of an electrowetting display.
  • Figure 3 is an expanded view of an ink transfer carrier.
  • Figure 4 is a simplified diagram of the operation of the ink filling apparatus.
  • Figure 5 is a perspective view of a pixel filling device.
  • Figure 6 is a front view of the pixel filling device.
  • the present invention provides an ink filling apparatus for an electrowetting display for filling ink into a display area of an electrowetting display substrate, and electrowetting is also known as electrowetting, and the present invention is equally applicable to electricity.
  • the ink fill of the wet display is also known as electrowetting, and the present invention is equally applicable to electricity.
  • the ink filling apparatus includes: an ink transfer carrier 14 having at least one oleophilic hydrophobic region 10 matching a display area to be filled with an electrowetting display substrate; and an ink supply device 13 for oleophilic hydrophobicity
  • the region 10 is coated with an ink; wherein the lipophilicity of the lipophilic hydrophobic region 10 is lower than the lipophilicity of the hydrophobic layer 5 in the pixel 9, and the lipophilic hydrophobic region 10 of the ink transfer carrier 14 is electrically charged
  • the display area of the display substrate that wets the display can be controlled to contact, thereby transferring the ink coated by the lipophilic hydrophobic region 10 into the pixel grid 9 of the display substrate display area.
  • the ink transfer carrier 14 is a pivotable roller 12 mounted in the ink filling device.
  • the surface of the roller 12 includes an oleophilic hydrophobic region 10 and a hydrophilic region 11, and the oleophilic hydrophobic region 10
  • the surface is coated with a layer of lipophilic hydrophobic material, which is less oleophilic and hydrophobic than the hydrophobic layer of the hydrophobic layer 5 in the electrophoretic display pixel 9, such as the surface of the lipophilic hydrophobic region 10 can be coated with perfluororesin (Cytop), the water layer 5 selects Teflon AF 1600 materials.
  • the electrowetting display contains a first fluid 7 and a second fluid 8 which are incompatible with each other, the first fluid 7 is an ink, the second fluid 8 is an electrolyte solution, and the electrolyte solution is an aqueous solution or ion in which a salt such as NaCl or CaCl 2 is dissolved. liquid.
  • the electrolyte solution only covers the hydrophilic region of the round roll, and the surface of the lipophilic hydrophobic region 10 is not covered by the electrolyte solution film.
  • the preferred electrolyte solution in this embodiment is an aqueous solution in which a salt such as NaCl or CaCl 2 is dissolved.
  • the ink filling device is further provided with a transmission 17 for conveying the display substrate 16 to be filled with the electrowetting display.
  • the transmission 17 is located below the circular roller 12, and is several parallel to the rotation axis of the circular roller 12.
  • the set scroll axis runs through the entire device, enabling automatic filming, auto-filling, automatic packaging and collection.
  • the display substrate 16 filling the electrowetting display can be in contact with the lipophilic hydrophobic region 10 of the round roll 12 during movement with the transmission 17.
  • the ink filling apparatus includes a case containing a second fluid 8, that is, an electrolyte solution, and the ink transfer carrier and the ink supply device are immersed in the electrolyte solution contained in the case.
  • the ink filling device is divided into three parts, a feeding area 18, a filling area 19 and a packaging area 20 from front to back, the feeding area 18 is for placing the display substrate 16; the filling area 19 is for realizing the first fluid 7, the coating and transfer of ink; the ink transfer carrier 14, the ink supply device 13 is immersed in the electrolyte solution; the encapsulation area 20 is used for encapsulation and collection of the electrowetting display, and the encapsulation area 20 is composed of the upper substrate
  • the automatic laminating machine and the electrowetting display device are composed of an automatic collecting device.
  • the ink supply device 13 includes a container having an elongated slit and a micro pump for pumping ink.
  • the ink supply device 13 is located at the top of the round roller 12, and the ink-repellent hydrophobic region 10 is ink-coated by the ink supply device 13 when the round roller 12 is rotated to the topmost position.
  • the ink filling apparatus further includes a substrate ink cleaning device 15 which is a round roller 12 having an oleophilic hydrophobic region 10 and a hydrophilic region 11, and the affinity of the oleophilic hydrophobic region 10 The oiliness is weaker than the lipophilicity of the hydrophobic layer 5 in the pixel 9.
  • the ink supply device 13 is in contact with the oleophilic hydrophobic region 10 of the ink transfer carrier 14, such that the oleophilic hydrophobic region 10 covers the ink 7 to form an oil film, and the oleophilic hydrophobic region 10 of the ink transfer carrier 14 Maintaining face-to-face contact with the display substrate 16, the ink covered by the lipophilic hydrophobic region 10 is transferred to the display area of the electrowetting display. Since the pixel wall 6 is made of a hydrophilic material, the continuity of the oil film is automatically blocked, so the ink Transfer to pixel 9 of the display.
  • the display substrate 16 continues to advance with the transmission device 17, and is in contact with the substrate ink cleaning device 15, since the lipophilic hydrophobic region 10 of the substrate ink cleaning device 15 is lipophilic, and the pixel wall is made of a hydrophilic material, so the pixel A small amount of ink remaining on the surface of the wall 6 is transferred from the surface of the pixel wall 6 to the surface of the lipophilic hydrophobic region 10 of the substrate ink cleaning device 15, thereby being carried away to complete the cleaning process.
  • the lipophilicity of the lipophilic hydrophobic region 10 of the substrate ink cleaning device 15 is weaker than that of the hydrophobic layer 5 in the pixel 9, so that the ink in the pixel 9 is not carried away by the substrate cleaning device 15.
  • the ink supply device 13 is composed of a container having an elongated slit at the lower end and a micropump, and it is possible to ensure sufficient ink on the surface of the lipophilic hydrophobic region 10 on the ink transfer carrier 14 by controlling the supply speed of the micropump.
  • the ink inside the ink supply system is emptied, and then the ink transfer carrier 14 is turned on to rotate under the electrolyte solution, and the surface of the lipophilic hydrophobic region 10 is not covered by the electrolyte solution film, and the hydrophilic region 11 is to be
  • the ink is initially supplied to the ink transfer carrier 14 by the micro pump, and a uniform oil film is formed on the surface of the lipophilic hydrophobic region 10 after contacting the ink, and the oil film is in accordance with the pixel of the electrowetting display device.
  • the size and pattern of the regions are patterned on the lipophilic hydrophobic material of the lipophilic hydrophobic region 10, and the surface of the hydrophilic region 11 is not covered by the ink due to the protection of the electrolyte solution film.

Abstract

L'invention concerne un dispositif et un procédé de remplissage d'encre pour un affichage à électro-mouillage. Le procédé comprend les étapes consistant à : enduire une encre sur un support (14) ayant des propriétés lipophiles et hydrophobes pour au moins former un film d'encre à transférer ayant une taille correspondant à la taille d'une zone d'affichage d'un substrat d'affichage (16), la propriété lipophile du support étant plus faible qu'une propriété lipophile d'une couche hydrophobe (5) dans des grilles de pixels (9) ; et amener de façon correspondante le film à transférer sur le support en contact avec une partie du substrat d'affichage (16) comprenant les grilles de pixels (9), de telle sorte que l'encre enduite sur le support est transférée vers les grilles de pixels (9) pour réaliser le remplissage d'encre. L'utilisation du procédé pour remplir une encre dans un dispositif d'affichage à électro-mouillage présente les avantages d'un remplissage d'encre uniforme, d'une bonne capacité de maîtrise, d'une vitesse de remplissage rapide, et d'une applicabilité à une production par lots.
PCT/CN2016/070362 2015-05-20 2016-01-07 Dispositif et procédé de remplissage d'encre pour dispositif d'affichage à électro-mouillage WO2016184135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510263327.2 2015-05-20
CN201510263327.2A CN104932096B (zh) 2015-05-20 2015-05-20 一种电润湿显示器的油墨填充设备及方法

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WO2016184135A1 true WO2016184135A1 (fr) 2016-11-24

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* Cited by examiner, † Cited by third party
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CN104932096B (zh) * 2015-05-20 2017-08-25 华南师范大学 一种电润湿显示器的油墨填充设备及方法
CN106154538B (zh) * 2016-08-10 2019-02-15 华南师范大学 一种电润湿显示器中填充油墨的方法

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WO2010084200A1 (fr) * 2009-01-26 2010-07-29 Seereal Technologies S.A. Dispositif pour modulation d'amplitude
JP2013101227A (ja) * 2011-11-09 2013-05-23 Canon Inc 液体光学素子及びその制御方法
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