KR20130057733A - Electrophoretic display apparatus and method for manufacturing the same - Google Patents

Electrophoretic display apparatus and method for manufacturing the same Download PDF

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KR20130057733A
KR20130057733A KR1020110123621A KR20110123621A KR20130057733A KR 20130057733 A KR20130057733 A KR 20130057733A KR 1020110123621 A KR1020110123621 A KR 1020110123621A KR 20110123621 A KR20110123621 A KR 20110123621A KR 20130057733 A KR20130057733 A KR 20130057733A
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filling
charged particles
color
charged
polarity
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KR1020110123621A
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Korean (ko)
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오영무
노영훈
이정원
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엘지디스플레이 주식회사
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Publication of KR20130057733A publication Critical patent/KR20130057733A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • G09G3/3446—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices with more than two electrodes controlling the modulating element
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

The present invention relates to an electrophoretic display device and a method of manufacturing the same that can improve display quality and manufacturing efficiency.
Method of manufacturing an electrophoretic display device according to an embodiment of the present invention comprises the steps of forming a thin film transistor and a pixel electrode on the lower substrate; Defining a pixel region by forming a partition wall to surround the pixel electrode; Filling the pixel area with charged particles of a first color charged with a first polarity by using a filling unit having a plurality of filling patterns formed thereon; Filling the pixel region with charged particles of a second color charged with a second polarity; Filling the pixel region with a solvent for driving the charged particles of the first color and the charged particles of the second color; And sealing the upper portion of the partition wall and the pixel area.

Description

Electrophoretic display device and its manufacturing method {ELECTROPHORETIC DISPLAY APPARATUS AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a display device, and more particularly, to an electrophoretic display device and a method of manufacturing the same that can improve display quality and manufacturing efficiency.

An electrophoretic display device (EPD) refers to a device for displaying an image using an electrophoresis phenomenon in which colored charged particles move by an electric field applied from the outside. Here, the electrophoretic phenomenon refers to a phenomenon in which the charged particles move in the liquid by the Coulomb force when an electric field is applied to the electrophoretic dispersion (e-ink) in which the charged particles are dispersed in the liquid.

When a substance with a charge is placed in an electric field, the substance moves in a specific manner depending on the charge, the size and shape of the molecule, and the like. Electrophoresis is a phenomenon in which substances are separated by the difference in the degree of movement.

The electrophoretic display apparatus using the electrophoretic phenomenon has a feature of bistable, and even if the applied voltage is removed, the original image can be displayed for a long time. That is, the electrophoretic display device is a display device suitable for the field of e-books that do not require a rapid exchange of the screen because it can maintain a constant screen for a long time even without applying a voltage continuously.

In addition, unlike the liquid crystal display device, the electrophoretic display device does not have a dependency on a viewing angle, and can provide an image that is comfortable to the eye to a degree similar to paper. In addition, demand has increased due to the advantages of flexibility, low power consumption, and eco-like flexibility.

1 is a view showing an electrophoretic display device according to the prior art.

Referring to FIG. 1, an electrophoretic display device according to the related art includes an electrophoretic film interposed between an oppositely bonded lower substrate 10 and an upper substrate 20, and between the lower substrate 10 and the upper substrate 20. (30).

The lower substrate 10 includes a plurality of gate lines (not shown) and a plurality of data lines (not shown) formed to cross each other. A plurality of pixels is defined by the gate line and the data line.

The thin film transistors 12 and the TFT and the pixel electrode 14 are formed in the plurality of pixels formed on the lower substrate 10.

The thin film transistor 12 is switched according to a scan signal applied through the gate line. The data voltage supplied to the data line by the switching of the thin film transistor 12 is supplied to the pixel electrode 14.

The common electrode 22 facing the pixel electrode 14 is formed on the upper substrate 20.

The electrophoretic film 30 has a plurality of microcapsules 32 composed of a plurality of charged particles 34 and a solvent, a protective layer for protecting the microcapsules 32 and adhering to the lower substrate 10. It includes.

Here, some of the charged particles 34 are partially charged with positive (+), and the other part is charged with negative (-).

When an electric field is formed between the pixel electrode 14 of the lower substrate 10 and the common electrode 22 of the upper substrate 20, the charged particles 34 included in the microcapsule 32 move by electrophoresis. By doing so, an image is realized.

The electrophoretic display device according to the related art manufactures the lower substrate 10, the upper substrate 20, and the lamination electrophoretic film 30, respectively. Thereafter, the electrophoretic film 30 is interposed between the lower substrate 10 and the upper substrate 20.

Here, the electrophoretic film 30 is stored and transported while attached to the upper substrate 20, and then the release film (not shown) attached to the lower portion is removed immediately before lamination to the lower substrate 10, and by the laminating process It is attached to the lower substrate 10.

Accordingly, since the lower substrate 10, the upper substrate 20, and the electrophoretic film 30 must be manufactured separately, the manufacturing process is complicated, and manufacturing time is required, resulting in a decrease in manufacturing efficiency. In addition, there is a problem that the manufacturing cost is increased by applying the electrophoretic film 30 manufactured separately.

To improve this problem, a technique for internalizing the electrophoretic layer on the lower substrate has been proposed. However, there are various problems due to the maturity of the manufacturing process technology for internalizing the electrophoretic layer on the lower substrate, which makes it difficult to apply the technology.

In particular, during the process of filling the electrophoretic dispersion (charge particles and solvent) to the lower substrate, there is a problem that the electrophoretic dispersion overflows into the adjacent cells, contamination occurs. When the electrophoretic display device displays a full color image, when the charged particles colored with a specific color overflow into neighboring pixels of different colors, the color image cannot be displayed and the light reflectance and contrast ratio are lowered. There is this. In addition, it is difficult to uniformly fill the dispersion liquid (charged particles and solvent) in all the cells of the lower substrate.

Due to the above problems, the driving reliability of the electrophoretic display device is lowered, and the manufacturing efficiency is lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide an electrophoretic display device having a high display quality and a manufacturing method thereof.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a method of manufacturing an electrophoretic display device capable of improving manufacturing efficiency of an electrophoretic display device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide an electrophoretic display device and a method of manufacturing the same, which can improve stability and driving reliability of charged particles embedded in a lower substrate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide an electrophoretic display device and a method of manufacturing the same, which can realize a high quality image in various colors.

The present invention is to solve the above problems, to provide an electrophoretic display device and a method of manufacturing the same that can prevent the overflow of the electrophoretic dispersion to increase the light reflectance, increase the contrast ratio (technique) do.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

Method of manufacturing an electrophoretic display device according to an embodiment of the present invention for achieving the above object comprises the steps of forming a thin film transistor and a pixel electrode on the lower substrate; Defining a pixel region by forming a partition wall to surround the pixel electrode; Filling the pixel area with charged particles of a first color charged with a first polarity by using a filling unit having a plurality of filling patterns formed thereon; Filling the pixel region with charged particles of a second color charged with a second polarity; Filling the pixel region with a solvent for driving the charged particles of the first color and the charged particles of the second color; And sealing the upper portion of the partition wall and the pixel area.

Electrophoretic display device according to an embodiment of the present invention for achieving the above object is a thin film transistor formed on a lower substrate; A pixel electrode connected to the thin film transistor; Barrier ribs formed around the pixel electrode to define a plurality of pixel regions; An electrophoretic dispersion filled in the pixel region including a plurality of charged particles and a solvent colored in a specific color; An upper substrate on which a common electrode is formed; And a sealing layer formed between the common electrode and the partition wall to bond the lower substrate and the upper substrate.

The present invention according to an embodiment can provide an electrophoretic display device having a high display quality and a manufacturing method thereof.

The present invention according to the embodiment can improve the manufacturing efficiency of the electrophoretic display device.

The present invention according to the embodiment can provide a method of manufacturing an electrophoretic display device capable of internalizing the electrophoretic dispersion on the lower substrate.

The present invention according to the embodiment can provide an electrophoretic display device and a method of manufacturing the same that can improve the stability and driving reliability of the charged particles embedded in the lower substrate.

The present invention according to the embodiment can provide an electrophoretic display device and a method of manufacturing the same that can implement a high quality image in a variety of colors.

A method of manufacturing an electrophoretic display device according to an embodiment of the present invention may improve mass production of an electrophoretic display device.

An electrophoretic display device according to an embodiment of the present invention can improve driving reliability.

The present invention according to the embodiment can provide an electrophoretic display device and a method of manufacturing the same that can prevent the overflow of the electrophoretic dispersion to increase the light reflectance, increase the contrast ratio (contrast ratio).

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view showing an electrophoretic display device according to the prior art.
2 is a cross-sectional view showing an electrophoretic display device according to an embodiment of the present invention.
3 is a cross-sectional view showing an electrophoretic display device according to another embodiment of the present invention.
Figure 4 is a plan view showing a lower substrate of the electrophoretic display device according to an embodiment of the present invention.
5 to 28 are views illustrating a method of manufacturing an electrophoretic display device according to embodiments of the present invention.

Hereinafter, an electrophoretic display device and a manufacturing method thereof according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing embodiments of the present invention, when a structure is described as being formed 'on or on top' and 'under or under' another structure, these descriptions may be used as well as when these structures are in contact with each other. It should be interpreted as including even if a third structure is interposed between them.

The present invention proposes an electrophoretic display device in which an electrophoretic dispersion liquid containing charged particles and a solvent is embedded in a lower substrate, and a method of manufacturing the same.

The technical idea of the present invention can be applied to all types of electrophoretic display devices regardless of whether a mono image or a color image is implemented.

The technical idea of the present invention described below, as well as the electrophoretic display device comprising a mono type and a color filter, the charged particles in the electrophoretic dispersion (electrophoretic ink) is red, green, blue ( The colors of blue, yellow, cyan, magenta, black, and white may be equally applied to an electrophoretic display device that selectively colors to display full color images. .

2 is a cross-sectional view showing an electrophoretic display device according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing an electrophoretic display device according to another embodiment of the present invention.

2, an electrophoretic display apparatus according to an embodiment of the present invention includes a lower substrate 100 having an electrophoretic dispersion 150 embedded therein; An upper substrate 200 on which the common electrode 220 is formed; And a sealing layer 300 for bonding the lower substrate 100 and the upper substrate 200 together.

The lower substrate 100 includes a lower base substrate 110, a thin film transistor 120 (hereinafter, referred to as a TFT), a pixel electrode 130, a partition wall 140, and an electrophoretic layer.

The lower base substrate 110 may be a glass substrate made of a transparent material, a plastic substrate having flexibility, or a metal substrate.

 Since the lower base substrate 110 is located on the opposite side of the screen on which the image is displayed, the lower base substrate 110 is not necessarily transparent, and in the case of manufacturing the electrophoretic display flexible, the flexible plastic substrate may be applied to the lower base substrate 110. have.

Although not shown in the drawing, the lower base substrate 110 has a plurality of gate lines and a plurality of data lines formed to cross each other.

Here, the gate line and the data line are formed of a single layer film made of silver (Ag), aluminum (Al), or an alloy thereof (Alloy) having a low resistivity.

Meanwhile, the gate line and the data line may be formed as a multilayer film further including a film made of chromium (Cr), titanium (Ti), or tantalum (Ta) having excellent electrical properties in addition to the single layer.

A plurality of pixels are defined by the intersection of the plurality of gate lines and the plurality of data lines, and the TFT 120 and the pixel electrode 130 are formed to correspond to each pixel.

The gate electrode of the TFT 120 is connected to the gate line, the source electrode is connected to the data line, and the drain electrode is connected to the pixel electrode 130.

The pixel electrode 130 is formed to correspond to the plurality of pixel regions defined by the partition wall 140, and applies a voltage to the pixel region by switching of the TFT 120.

The pixel electrode 130 is electrically connected to the drain electrode of the TFT 120 through the contact hole, and may be formed of a material of copper, aluminum, and indium tin oxide (ITO). In addition, the pixel electrode 130 may be formed by further stacking nickel and / or gold on a material of copper, aluminum, and indium tin oxide (ITO).

A partition wall 130 defining a pixel area is formed on the lower substrate 100, and the partition wall 140 is formed to surround the pixel electrode 130 as illustrated in FIG. 4.

A filling space is formed for each pixel by the partition wall 140, and the electrophoretic dispersion 150 is filled in the filling space thus formed to internalize the electrophoretic layer on the lower substrate 100.

Although not shown in the drawing, an interlayer is formed inside the filling space to physically isolate the charged particles 152 of the electrophoretic dispersion 150 from the partition wall 140.

The partition wall 140 is formed on the lower substrate to define a pixel area, and defines a filling space in which the electrophoretic dispersion 150 is filled. In this case, the partition wall 140 is formed to have a height of 10um to 100um and a width of 5um to 30um, and is formed to surround the pixel electrode 130.

Here, the partition wall 140 is formed through a photo lithography or mold printing process. The partition wall 140 may be formed of a non-polar organic material or a non-polar inorganic material so as to match the physical properties of the electrophoretic dispersion 150.

The electrophoretic dispersion 150 is composed of a plurality of charged particles 152 charged with a positive (+) or negative (-) polarity and a solvent 154 including a binder. The electrophoretic dispersion 150 is filled in a filling space (fill cell) defined by the partition wall 140.

When the electrophoretic display device displays a color image, the charged particles 152 are red, blue, green, yellow, cyan, magenta, black ( Black and white colors may be selectively colored.

Here, the black charged particles may be charged with the first polarity (negative polarity), and the charged particles colored with the color thereof may be charged with the second polarity (positive).

On the other hand, when the electrophoretic display device displays a mono image, as shown in FIG. 3, the charged particles 152 are colored in black and white colors.

Here, the black charged particles may be charged with the first polarity (negative polarity), and the white charged particles may be charged with the second polarity (positive).

Solvent 154 includes halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides, vinyl Vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, liquid paraffinic or poly chlorotrifluoroethylene polymers This can be used.

The electrophoretic dispersion 150 is applied to the pixel region (filling cell) defined by the partition wall 140 by applying an electric field to the filling unit in which the filling pattern is formed to selectively inject positive charged particles and negative charged particles. Can be filled.

In addition, the electrophoretic dispersion 150 may be a die coating method, casting method, bar coating method, slit coating method, dispensing method, squeezing The pixel region (filling cell) defined by the partition wall 140 may be filled by a method, a screen printing method, an inkjet printing method, or a photo lithography method.

As described above, in the electrophoretic display device according to the exemplary embodiment, the electrophoretic dispersion 150 including the plurality of charged particles 152 and the solvent 154 is filled in the pixel region defined by the partition wall 140. . Through this, the electrophoretic layer is internalized in the lower substrate 100.

In the electrophoretic display apparatus according to an exemplary embodiment of the present invention, the electrophoretic dispersion 150 is prevented from overflowing to the neighboring pixel areas to prevent color mixing between the pixels. By filling the electrophoretic dispersion 150 smoothly, the light reflectance can be increased and the contrast ratio can be increased.

Subsequently, the upper substrate 200 includes an upper base substrate 210 and a common electrode 220.

Since the upper base substrate 210 should be transparent to display an image, the upper base substrate 210 is formed of a glass of transparent material or a material of flexible transparent plastic.

The common electrode 220 corresponds to the pixel electrode 130 of the lower substrate 100 to supply a common voltage Vcom to each pixel area. The common electrode 220 is formed of a conductive transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

An electric field is formed in each pixel region by the common voltage Vcom applied to the common electrode 220 and the data voltage applied to the pixel electrode 130, and the charged particles 152 are formed in the solvent 154 by the electric field. Move to implement the image.

The sealing layer 300 is formed between the lower substrate 100 and the upper substrate 200. The sealing layer 300 is for bonding the lower substrate 100 and the upper substrate 200 and sealing the electrophoretic dispersion 150, and the partition wall 140 and the upper substrate 200 of the lower substrate 100 are sealed. Are positioned between the common electrodes 220.

The sealing layer 300 may be formed on the lower substrate 100 during the manufacturing process, and then the upper substrate 200 may be bonded. Meanwhile, the sealing layer 300 may be formed on the upper substrate 200 in the manufacturing process, and then the lower substrate 100 may be bonded.

The sealing layer 300 may be formed of a material having a repulsion with the electrophoretic dispersion 150 so that the electrophoretic dispersion 150 does not overflow to neighboring pixels. The sealing layer 300 may be formed to have a thickness of 0.1 μm to 40 μm with an electrically nonpolar organic material or an nonpolar inorganic material.

Here, the sealing layer 300 is a vacuum deposition (CVD, Sputter) method, a die coating method (Casting) method, bar coating method (Bar coating) method, slit coating method (Slit Coating method), dispense (Dispense) Coating organic or inorganic material on top of the lower substrate 100 by using a squeezing method, a screen printing method, an inkjet printing method, or a gravure roll printing method. Then, it may be formed by curing by applying ultraviolet (UV) or heat.

The electrophoretic dispersion 150 prevents the electrophoretic dispersion 150 from overflowing into the filling space of another pixel through the sealing layer 300 formed of a material having a repulsive force and the lower substrate 100 and the upper substrate 200. ) To seal the electrophoretic display device.

In addition, the sealing layer 300 prevents the charged particles 152 of the electrophoretic dispersion 150 internalized into the lower substrate 100 from directly contacting the common electrode 220, so that the polarity of the charged particles 152 disappears. Can be prevented.

When the sealing layer 300 is formed of an organic material, an organic material or a non-conductive transparent organic material that can be coated with a polymer, an acrylic UV curable resin, an organic self-assembling monolayer thin film (organic SAM layer) is a material. It can be used as.

On the other hand, when the sealing layer 300 is formed of an inorganic material, silicon nitride (for example, SiN x ), amorphous silicon (a-Si), silicon oxide (for example SiO x ), aluminum oxide (for example , Al 2 O 3 ) or non-conductive transparent inorganic material may be used as the material.

In the electrophoretic display device according to an exemplary embodiment of the present invention, the filling induction pattern 140 may be formed in the pixel region, so that the electrophoretic dispersion 150 may be smoothly filled in the pixel region, thereby increasing light reflectance and contrast ratio. .

In addition, the electrophoretic dispersion 150 may be prevented from overflowing to the upper portion of the partition wall 140, and from overflowing to neighboring pixels to prevent color mixing.

In addition, the bonding between the lower substrate 100 and the upper substrate 200 is smoothly continued using the sealing layer 300. In addition, it is possible to prevent the penetration of air and moisture by sealing the electrophoretic dispersion 150 is internalized in the lower substrate (100).

In the above description, the lower substrate 100 and the upper substrate 200 are bonded to each other by using the sealing layer 300, but the lower substrate 100 and the lower substrate 100 are formed by using a lamination method without forming the sealing layer 300. The upper substrate 200 may be bonded to each other.

When the solvent 154 for driving the charged particles 152 overflows to the neighboring pixels, the upper part of the partition wall 140 is contaminated, and the light reflectance and reputation ratio are reduced.

When the electrophoretic display device displays a full color image, colored charged particles may be filled to match the color displayed by the pixel. As an example, when charged particles colored in red and filled in the red pixel overflow into neighboring blue pixels or green pixels, color mixing occurs, thereby making it impossible to implement a color image.

As such, when color mixing occurs, the color image cannot be displayed, and therefore, color mixing of the charged particles must be prevented in order to display the color image.

In the electrophoretic display device according to an exemplary embodiment of the present invention, the electrophoretic dispersion 150 does not overflow to neighboring pixels in the filling process, thereby improving display quality by increasing light reflectance and contrast ratio. In addition, the stability and driving reliability of the charged particles 152 embedded in the lower substrate 100 may be improved.

5 to 28 are views illustrating a method of manufacturing an electrophoretic display device according to embodiments of the present invention. Hereinafter, a method of manufacturing an electrophoretic display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 5 to 10.

Referring to FIG. 5, a TFT 120 is formed on the lower base substrate 110 to correspond to each of the plurality of pixel regions, and an insulating layer is formed to cover the TFT 120.

Here, the lower base substrate 110 may be a glass substrate of a transparent material, a plastic substrate or a metal substrate having flexibility. Since the lower substrate 110 is located on the opposite side of the screen on which the image is displayed, the lower substrate 110 is not necessarily transparent, and when the electrophoretic display device is manufactured to be flexible, a flexible plastic substrate may be applied to the lower base substrate 110. .

Subsequently, referring to FIG. 6, after applying a conductive material such as copper, aluminum, or ITO on the insulating layer, a photolithography process and an etching process are performed to form the pixel electrode 130 in each of the plurality of pixel regions. .

The pixel electrode 130 may be formed by further stacking nickel and / or gold on the above-described materials of copper, aluminum, and indium tin oxide (ITO).

Although not shown in FIGS. 5 and 6, a plurality of gate lines and data lines that cross each other are formed on the lower base substrate 110. The TFT 120 is formed in an area where a plurality of gate lines and data lines cross each other.

The data line is connected to the source electrode of the TFT 120, the gate line is connected to the gate electrode of the TFT 120, and the drain electrode of the TFT 120 is electrically connected to the pixel electrode 130 through a contact hole. .

Subsequently, referring to FIG. 7, after the organic material or the inorganic material is coated on the lower base substrate 110 on which the pixel electrode 130 is formed, the pixel electrode 130 is patterned by photolithography. The partition wall 140 is formed to surround.

A pixel region, that is, a filling space (filling cell), in which the electrophoretic dispersion 150 is filled through the partition wall 140 is defined. In this case, the partition wall may be formed to have a height of 10um ~ 100um and a width of 5um ~ 30um.

Here, the partition wall 140 may be formed using a photolithography method using a mask. In addition, the partition wall 140 may be formed using not only a photo lithography method but also an imprinting or mold printing method.

Thereafter, the electrophoretic dispersion is filled in the filling space formed by the partition wall 140.

Subsequently, referring to FIG. 8, the mask 310 having the pixel region opened is aligned on the partition wall 140, and the electrophoretic dispersion 150 is filled in the pixel region by screen printing using the squeegee bar 320. You can.

Specifically, the mask 310 opening about one quarter of the pixel area is aligned on the partition wall 140. Subsequently, the electrophoretic dispersion 150 including the charged particles 152 and the solvent 154 is filled in the pixel region by a screen printing method using a squeeze bar 320.

On the other hand, the screen printing method has a disadvantage that the filling process is difficult because the black charged particles and the white charged particles must be mixed and injected at once.

In addition, when the electrophoretic dispersion 150 is filled, static electricity is generated by friction between the mask 310 and the squeegee bar 320, so that the charged particles 152 may not be precisely controlled.

In order to alleviate these disadvantages, electrophoresis is performed on the pixel region (filling cell) defined by the partition wall 140 by applying an electric field to the filling unit in which the filling pattern is formed and selectively injecting the positive charged particles and the negative charged particles. The dispersion 150 is filled.

Referring to FIG. 9, the black and white charged particles 152 and the filling solvent 156 are mixed in a separately provided container 330. At this time, the black charged particles and the white charged particles are charged with the opposite polarity, the filling solvent has a high viscosity of 1kcP ~ 100kcP.

Thereafter, the filling unit 400 in which the plurality of filling patterns 410 corresponding to the pixel area are formed is provided. Here, the filling pattern 410 has a bar shape formed to protrude from the body.

The filling unit 400 is formed of an electrically conductive mold material to which an electric field may be applied and a pattern of a predetermined shape may be formed. The filling pattern 410 is formed to have a size of 40% to 80% of the filling space.

The filling unit 400 having the plurality of filling patterns 410 is immersed into the container 330. In this case, an electric field of ± 5V to ± 30V is applied to the filling unit 400.

As an example, when the black charged particles are charged with negative polarity (−), an electric field of + 5V to + 30V is applied to the filling unit 400. On the contrary, when the black charged particles are charged with positive polarity (+), an electric field of -5V to -30V is applied to the filling unit 400.

Hereinafter, black charged particles are charged with a negative polarity, and charged particles colored with a color other than the above are based on a state of being charged with a positive polarity.

Subsequently, referring to FIG. 10, when an electric field having a polarity opposite to that of the black charged particles is applied to the filling unit 400, the black charged particles and the filling solvent adhere to the filling pattern 410.

Subsequently, referring to FIG. 11, the filling pattern 410 is aligned on the partition wall 140 while maintaining the electric field applied to the filling unit 400. That is, the filling pattern 410 is aligned in the pixel area.

Next, referring to FIG. 12, the black charged particles are filled (injected) in the pixel area by removing the electric field applied to the filling unit 400. In this case, when the electric field having a polarity opposite to that of the black charged particles is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the black charged particles may be improved.

Thereafter, the filling solvent 156 filled in the pixel region together with the black charged particles is volatilized.

Subsequently, in order to fill the white charged particles in the pixel area, the filling unit 400 in which the plurality of filling patterns 410 are formed is immersed into the container 330.

Referring to FIG. 13, when the white charged particles are charged with positive polarity (+), an electric field of −5 V to −30 V is applied to the filling unit 400. When an electric field of opposite polarity to the white charged particles is applied to the filling unit 400, the white charged particles and the filling solvent adhere to the filling pattern 410.

Subsequently, referring to FIG. 14, the filling pattern 410 is aligned on the partition wall 140 while maintaining the electric field applied to the filling unit 400. That is, the filling pattern 410 is aligned in the pixel area.

Subsequently, referring to FIG. 15, the white charged particles are filled (injected) in the pixel area by removing the electric field applied to the filling unit 400. In this case, when the electric field having a polarity opposite to that of the white charged particles is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the white charged particles may be improved.

Here, by adjusting the electric field applied to the filling unit 400, it is possible to adjust the amount of charged particles 152 adsorbed to the plurality of filling patterns 410. Therefore, the amount and ratio of the black charged particles 152a and the white charged particles 152b filled in the pixel area may be adjusted by adjusting the electric field applied to the filling unit 400.

Thereafter, the filling solvent 156 filled in the pixel region together with the white charged particles is volatilized.

Next, referring to FIG. 16, a solvent 154 for electrophoretic driving is injected into the pixel region filled with the black and white charged particles 152.

Here, the solvent 154 has a viscosity of 10 cps to 100 cP so that the black and white charged particles 152 may be electrophoresed by an electric field. As such, the low-viscosity solvent 154 is filled in the pixel region to smoothly drive the charged particles 152.

Solvent 154 includes halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides, vinyl Vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, liquid paraffinic or poly chlorotrifluoroethylene polymers This can be used.

Thereafter, the sealant is coated on the partition wall 140 to form the sealing layer 300. The upper part of the partition wall 140 and the electrophoretic dispersion 150 are sealed through the sealing layer 300.

At this time, the sealing layer 300 is bonded to the lower substrate 100 and the upper substrate 200 formed in the manufacturing process described below, as well as sealing the electrophoretic dispersion 150.

The sealing layer 300 may be formed of a material having a repulsion with the electrophoretic dispersion 150 so that the electrophoretic dispersion 150 does not overflow to neighboring pixels. The sealing layer 300 may be formed to have a thickness of 0.1 μm to 40 μm with an electrically nonpolar organic material or an nonpolar inorganic material.

Here, the sealing layer 300 is a vacuum deposition (CVD, Sputter) method, a die coating method (Casting) method, bar coating method (Bar coating) method, slit coating method (Slit Coating method), dispense (Dispense) Coating organic or inorganic material on top of the lower substrate 100 by using a squeezing method, a screen printing method, an inkjet printing method, or a gravure roll printing method. Then, it may be formed by curing by applying ultraviolet (UV) or heat.

Meanwhile, after filling the black charged particles in the entire pixel region, the filling unit 400 may not use the filling unit 400. For example, after the white charged particles and the solvent 154 are mixed, the white charged particles and the solvent 154 may be filled in the pixel area by using a dispensing method or a printing method.

17, the common electrode 220 is formed on the upper base substrate 210 to fabricate the upper substrate 200.

Conductive transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the upper base substrate 210 of glass of transparent material or flexible transparent plastic material Is applied to form the common electrode 220.

The common electrode 220 corresponds to the pixel electrode 130 to supply the common voltage to each pixel region for driving the charged particles 152.

 Thereafter, the lower substrate 100 and the upper substrate 200 are bonded to each other using the sealing layer 300. In this case, the manufacturing of the upper substrate 200 may be performed separately from the manufacturing process of the lower substrate 100, and may be prepared in advance through a preceding manufacturing process.

The bonding of the upper substrate 200 and the lower substrate 100 may be performed through a pressing process applying a predetermined pressure, and an annealing process applying a predetermined temperature together with the pressing process may be performed.

Meanwhile, after the sealing layer 300 is formed on the common electrode 220 of the upper substrate 200 without forming the sealing layer 300 on the lower substrate 100, the lower substrate 100 and the upper substrate are formed. The 200 may be bonded.

In addition, the sealing layer 300 may be manufactured in a film type, and then the upper substrate 100 and the lower substrate 200 may be bonded using a lamination process.

As described above, the lower substrate 100 and the upper substrate 200 are bonded to each other by using the sealing layer 300 to completely shield the display area. Therefore, a defect in which the electrophoretic display device is contaminated by external air and moisture can be prevented, and mass production and reliability of the electrophoretic display device can be improved.

By performing the above-described manufacturing process, the electrophoretic dispersion 150 may be internalized on the lower substrate 100 to manufacture an electrophoretic display device displaying a mono image.

Hereinafter, a method of manufacturing an electrophoretic display device according to another exemplary embodiment of the present invention capable of displaying a color image will be described with reference to FIGS. 18 to 28.

When the electrophoretic display device implements full color, the charged particles 152 are colored in a color corresponding to the color to be displayed by each cell.

Therefore, the filling process of the electrophoretic dispersion 150 composed of the charged particles 152 and the solvent 154 may be sequentially performed for each color of the colored charged particles 152.

For example, when a plurality of pixels are configured with three colors of red, green, and blue, the pixels correspond to the colors of red, green, and blue. The charging of the charged particles 152 may be sequentially performed for each pixel.

Here, the solvent 154 has a nonpolar characteristic. At this time, when the electrophoretic dispersion 150 is filled, the pixel electrode 130 may be supplied with a positive polarity (+) voltage or a negative polarity (−) voltage.

Referring to FIG. 18, the black charged particles 152a and the filling solvent 156 are mixed in a container 330 provided separately. At this time, the black charged particles (152a) is charged with a negative polarity (-), the filling solvent has a high viscosity of 1kcP ~ 100kcP.

Thereafter, the filling unit 400 in which the plurality of filling patterns 410 are formed is immersed into the container 330. At this time,

Since the black charged particles 152a are charged with negative polarity (−), an electric field of + 5V to + 30V is applied to the filling unit 400.

As such, when an electric field having a polarity opposite to that of the black charged particles 152a is applied to the filling unit 400, the black charged particles 152a and the filling solvent 156 adhere to the filling pattern 410.

Subsequently, referring to FIG. 19, the filling pattern 410 is aligned on the partition wall 140 while maintaining the electric field applied to the filling unit 400. That is, the filling pattern 410 is aligned in the pixel area.

Next, referring to FIG. 20, the black charged particles 152a are filled (injected) in the pixel area by removing the electric field applied to the filling unit 400. In this case, when the electric field having a polarity opposite to that of the black charged particles 152a is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the black charged particles may be improved.

Thereafter, the filling solvent 156 filled in the pixel region together with the black charged particles 152a is volatilized.

Next, referring to FIG. 21, in order to fill the red charged particles 152c in the pixel area for displaying the red color among all the pixels, the filling unit 400 having the plurality of filling patterns 410 is formed into red large particles. 152c and the filling solvent 156 is immersed in the container 330 is contained. At this time, the red charged particles 152c are charged with positive polarity (+).

When the red charged particles 152c are charged with positive polarity (+), an electric field of −5 V to −30 V is applied to the filling unit 400. When an electric field having a polarity opposite to that of the red charged particles 152c is applied to the filling unit 400, the red charged particles 152c and the filling solvent adhere to the filling pattern 410.

Subsequently, referring to FIG. 22, the filling pattern 410 is aligned on the partition wall 140 while maintaining the electric field applied to the filling unit 400. That is, the filling pattern 410 is aligned in the pixel area.

Referring to FIG. 23, the electric field applied to the filling unit 400 is removed to fill (inject) the red charged particles 152c into the pixel area. In this case, when the electric field having a polarity opposite to that of the red charged particles 152c is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the red charged particles 152c may be improved.

Thereafter, the filling solvent 156 filled in the pixel area together with the red charged particles 152c is volatilized.

Subsequently, in order to fill the green charged particles 152d in the pixel area for displaying the green color among all the pixels, the charged unit 400 having the plurality of filling patterns 410 is formed in the green charged particles 152d and the filling solvent. 156 is immersed in the container 330 is contained. At this time, the green charged particles 152d are charged with positive polarity (+).

Referring to FIG. 24, when the green charged particles 152d are charged with positive polarity (+), an electric field of −5 V to −30 V is applied to the filling unit 400. When an electric field having a polarity opposite to that of the green charged particles 152d is applied to the filling unit 400, the green charged particles 152d and the filling solvent adhere to the filling pattern 410.

While maintaining the electric field applied to the filling unit 400, the filling pattern 410 is aligned on the partition wall 140. That is, the filling pattern 410 is aligned in the pixel area.

Referring to FIG. 25, the electric field applied to the filling unit 400 is removed to fill (inject) the green charged particles 152d in the pixel area. In this case, when the electric field having a polarity opposite to that of the green charged particles 152d is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the green charged particles 152d may be improved.

Thereafter, the filling solvent 156 filled in the pixel region is volatilized together with the green charged particles 152d.

Subsequently, in order to fill the blue charged particles 152e in the pixel area for displaying the blue color among all the pixels, the filling unit 400 having the plurality of filling patterns 410 is formed in the blue charged particles 152e and the filling solvent. 156 is immersed in the container 330 is contained. At this time, the blue charged particles 152e are charged with positive polarity (+).

Referring to FIG. 26, when the blue charged particles 152e are charged with positive polarity (+), an electric field of −5 V to −30 V is applied to the filling unit 400. When an electric field having a polarity opposite to that of the blue charged particles 152e is applied to the filling unit 400, the blue charged particles 152e and the filling solvent adhere to the filling pattern 410.

While maintaining the electric field applied to the filling unit 400, the filling pattern 410 is aligned on the partition wall 140. That is, the filling pattern 410 is aligned in the pixel area.

Next, referring to FIG. 27, the blue charged particles 152e are filled (injected) in the pixel area by removing the electric field applied to the filling unit 400. In this case, when the electric field having a polarity opposite to that of the blue charged particles 152e is applied to the pixel electrode 130 of the lower substrate 100, the filling characteristics of the blue charged particles 152e may be improved.

Here, by adjusting the electric field applied to the filling unit 400, it is possible to adjust the amount of charged particles 152 adsorbed to the plurality of filling patterns 410. Therefore, by adjusting the electric field applied to the filling unit 400, the amount and ratio of the black charged particles 152a and the charged particles 152b to 152e of different colors may be adjusted.

Thereafter, the filling solvent 156 filled in the pixel area together with the blue charged particles 152e is volatilized.

Subsequently, referring to FIG. 28, a solvent 154 for electrophoretic driving in a pixel region filled with the black charged particles 152a, the red charged particles 152c, the green charged particles 152d, and the blue charged particles 152e. Inject

Here, the solvent 154 has a viscosity of 10 cps to 100 cP so that the charged particles 152 may be electrophoresed by an electric field. As such, the low-viscosity solvent 154 is filled in the pixel region to smoothly drive the charged particles 152.

Thereafter, the sealant is coated on the partition wall 140 to form the sealing layer 300. The upper part of the partition wall 140 and the electrophoretic dispersion 150 are sealed through the sealing layer 300.

At this time, the sealing layer 300 is bonded to the lower substrate 100 and the upper substrate 200 formed in the manufacturing process described below, as well as sealing the electrophoretic dispersion 150.

Subsequently, a process of manufacturing the upper substrate 200 and bonding the lower substrate 100 and the upper substrate 200 is the same as the above-described embodiment, and thus a detailed description thereof will be omitted.

On the other hand, the filling process of the electrophoretic dispersion 150 is not only a method of selectively injecting the positive charged particles and negative charged particles by applying an electric field to the filling unit 400 having a plurality of filling patterns 410, the screen printing method Die coating method, casting method, bar coating method, slit coating method, dispensing method, squeezing method, method, inkjet printing printing) may be used.

The electrophoretic display device manufactured by the manufacturing method according to the embodiments of the present invention is applied to the pixel region by an electric field formed by the data voltage applied to the plurality of pixel electrodes 130 and the common voltage applied to the common electrode 220. The charged particles 152 of the filled electrophoretic dispersion 150 may move in the solvent 154 to realize a mono image and a color image.

In the method of manufacturing the electrophoretic display device according to the embodiment of the present invention, the filling induction pattern 140 may be formed in the pixel area to prevent the electrophoretic dispersion 150 from overflowing during the manufacturing process. Through this, it is possible to increase the light reflectance and to increase the contrast ratio.

The manufacturing method of the electrophoretic display device according to the embodiments of the present invention may improve the manufacturing efficiency of the electrophoretic display device and improve the stability and driving reliability of the charged particles embedded in the lower substrate.

The manufacturing method of the electrophoretic display device according to the embodiments of the present invention can prevent the overflow of the electrophoretic dispersion 150 is internalized on the lower substrate, and the sealing can be made smoothly to implement a high quality image in various colors. .

The manufacturing method of the electrophoretic display device according to the embodiments of the present invention described above has an advantage that the manufacturing infrastructure (infra) used in the manufacturing process of the existing liquid crystal display device can be applied.

Those skilled in the art to which the present invention pertains will understand that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: lower substrate 110: lower base substrate
120: TFT 130: pixel electrode
140: bulkhead 150: electrophoretic dispersion
152: charged particles 154: solvent
156: filling solvent 200: upper substrate
210: upper base substrate 220: common electrode
300: sealing layer 310: mask
320: squeegee bar 330: container
400: filling unit 410: filling pattern

Claims (10)

Forming a thin film transistor and a pixel electrode on the lower substrate;
Defining a pixel region by forming a partition wall to surround the pixel electrode;
Filling the pixel area with charged particles of a first color charged with a first polarity by using a filling unit having a plurality of filling patterns formed thereon;
Filling the pixel region with charged particles of a second color charged with a second polarity;
Filling the pixel region with a solvent for driving the charged particles of the first color and the charged particles of the second color; And
And sealing the upper portion of the partition wall and the pixel area. The method of claim 1,
The first color is black,
And the second color is one of white, red, green, blue, yellow, magenta, and cyan. The method of claim 1,
In the filling of the pixel region with charged particles of a first color,
Providing a container containing charged particles of a first color charged with a first polarity and a filling solvent;
Immersing the filling unit in the container and applying an electric field of a second polarity to the filling unit to adsorb charged particles and a filling solvent of a first color charged with a first polarity to the plurality of filling patterns;
And aligning the filling unit to the upper part of the partition wall, and then removing the electric field applied to the filling unit to fill the pixel area with charged particles and a filling solvent of a first color. Method of manufacturing the device. The method of claim 3, wherein
In the filling of the pixel region with a charged particle of a second color,
Providing a container containing charged particles of a second color charged with a second polarity and a filling solvent;
Immersing the filling unit in the container and applying an electric field having a first polarity to the filling unit to adsorb charged particles and a filling solvent of a second color charged with a second polarity to the plurality of filling patterns;
And aligning the filling unit in the upper part of the partition wall, and removing the electric field applied to the filling unit to fill the pixel region with charged particles and a filling solvent of a second color. Method of manufacturing the device. The method of claim 4, wherein
The electric field applied to the filling unit is ± 5V ~ ± 30V,
And applying a polarity opposite to the polarity charged to the charged particles to be filled in the pixel region to the filling unit. The method of claim 4, wherein
And a field of a second polarity is applied to the pixel electrode when the charged particles of the first color charged with the first polarity are filled in the pixel region. The method of claim 4, wherein
The method of manufacturing an electrophoretic display device, characterized in that an electric field of a first polarity is applied to the pixel electrode when the charged particles of the second color charged with the second polarity are filled in the pixel region. The method of claim 4, wherein
The filling solvent has a viscosity of 1kcP ~ 100kcP,
The solvent is a manufacturing method of an electrophoretic display device, characterized in that it has a viscosity of 10cP ~ 100cP. A thin film transistor formed on the lower substrate;
A pixel electrode connected to the thin film transistor;
Barrier ribs formed around the pixel electrode to define a plurality of pixel regions;
An electrophoretic dispersion filled in the pixel region including a plurality of charged particles and a solvent colored in a specific color;
An upper substrate on which a common electrode is formed; And
And a sealing layer formed between the common electrode and the partition wall to bond the lower substrate and the upper substrate together. The method of claim 9,
The plurality of charged particles include charged particles of a first color charged with a first polarity and charged particles of a second color charged with a second polarity,
Wherein the first color is black, and the second color is one of white, red, green, blue, yellow, magenta, and cyan.
KR1020110123621A 2011-11-24 2011-11-24 Electrophoretic display apparatus and method for manufacturing the same KR20130057733A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110320724A (en) * 2019-07-22 2019-10-11 浙江富申科技有限公司 A kind of block type multicolor displaying electrophoretic display apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110320724A (en) * 2019-07-22 2019-10-11 浙江富申科技有限公司 A kind of block type multicolor displaying electrophoretic display apparatus

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