KR20130019180A - Electrophoretic display device and manufacturing method the same - Google Patents

Electrophoretic display device and manufacturing method the same Download PDF

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KR20130019180A
KR20130019180A KR1020110081173A KR20110081173A KR20130019180A KR 20130019180 A KR20130019180 A KR 20130019180A KR 1020110081173 A KR1020110081173 A KR 1020110081173A KR 20110081173 A KR20110081173 A KR 20110081173A KR 20130019180 A KR20130019180 A KR 20130019180A
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South Korea
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solvent
electrophoretic
electrophoretic dispersion
lower substrate
filling
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KR1020110081173A
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Korean (ko)
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유영준
박용인
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엘지디스플레이 주식회사
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Publication of KR20130019180A publication Critical patent/KR20130019180A/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 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • G02F1/0107—Gaskets, spacers or sealing of cells; Filling and closing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133377—Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
    • 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
    • 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)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

PURPOSE: An electrophoresis display device and a manufacturing method thereof are provided to increase light reflectivity by preventing the overflow of electrophoresis dispersing liquid. CONSTITUTION: An electrophoresis dispersing liquid includes charged particles(150). The electrophoresis dispersing liquid is filled in a pixel region. A wiper cleaner(300) is formed on a partition(130). A common electrode(210) is formed beneath an upper substrate(200). A sealing layer(320) is formed between the common electrode and the partition. The sealing layer bonds a lower substrate(100) to the upper substrate.

Description

Electrophoretic display and its manufacturing method {ELECTROPHORETIC DISPLAY DEVICE AND MANUFACTURING METHOD 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.

The electrophoretic display device refers to a device for displaying an image by using 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 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. In other words, the electrophoretic display is a display device suitable for the field of e-books in which a constant screen can be maintained for a long time without applying a voltage continuously, and thus a quick replacement of the screen is not required.

In addition, unlike a liquid crystal display, the electrophoretic display device does not have a dependency on a viewing angle, and may provide a comfortable image 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.

In order to improve such a problem, a technique of internalizing the electrophoretic layer on the lower substrate has been proposed, but various problems are generated because the manufacturing process technology of internalizing the electrophoretic layer on the lower substrate is difficult to apply. There is this.

Since the sealing of the lower substrate and the upper substrate is not made smoothly, there is a problem that does not completely block the outside air and moisture penetration.

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 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 inferior. There is a problem.

Due to the above-described problems, there is a problem in that driving reliability of the electrophoretic display device is lowered and 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 high display quality and a method of manufacturing the same.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides an electrophoretic display device and a method of manufacturing the same, which can increase light reflectance and increase contrast ratio by preventing the electrophoretic dispersion from overflowing. Shall be.

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 capable of realizing a high quality image in various colors and a method of manufacturing the same.

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.

In accordance with another aspect of the present invention, an electrophoretic display includes: barrier ribs formed around a pixel electrode formed on a lower substrate to define a plurality of pixel regions; An electrophoretic dispersion filled with a pixel region in which the lower inter layer is formed, including a plurality of charged particles colored to display a specific color; A wiper cleaner formed on the partition wall; 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.

According to an aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, the method including: forming a partition wall to surround a plurality of pixels of a lower substrate; Forming a wiper cleaner having a hole exposing the pixel on the partition wall; Filling an electrophoretic dispersion including a plurality of charged particles and a solvent colored to display a specific color in a pixel region defined by the partition wall; Forming a common electrode on the upper substrate; Forming a sealing layer on the barrier rib or on the common electrode; And bonding the lower substrate and the upper substrate using the sealing layer.

According to an embodiment of the present invention, an electrophoretic display device having high display quality and a method of manufacturing the same may be provided.

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).

According to an embodiment of the present invention, manufacturing efficiency of an electrophoretic display device may be improved.

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 exemplary embodiment of the present invention may improve mass production of an electrophoretic display device.

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

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

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 of an electrophoretic display device according to an exemplary embodiment of the present invention.
3 is a plan view illustrating a lower substrate of an electrophoretic display according to an exemplary embodiment of the present invention.
4 is a plan view illustrating a wiper cleaner of an electrophoretic display according to an exemplary embodiment of the present invention.
5 to 14 illustrate a method of manufacturing an electrophoretic display device according to an exemplary embodiment 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 manufacturing method thereof.

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

The technical idea of the present invention can be applied to all types of electrophoretic displays regardless of whether they are mono or color implemented, but in the following, the charged particles are red, green, blue and black. An electrophoretic display device that displays a full color image by coloring with a color of) will be described as an example.

2 is a cross-sectional view illustrating an electrophoretic display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, an electrophoretic display device according to an exemplary embodiment includes a lower substrate 100 having an electrophoretic dispersion embedded therein; An upper substrate 200 on which the common electrode 210 is formed; A wiper cleaner 300 interposed between the lower substrate 100 and the upper substrate 200; And a sealing layer 320 bonding the lower substrate 100 and the upper substrate 200 to each other.

The lower substrate 100 may be a glass substrate made of a transparent material, a plastic substrate having flexibility, or a metal substrate. The lower substrate is not necessarily transparent because the lower substrate is positioned on the opposite side of the screen on which the image is displayed, and when the electrophoretic display is manufactured to be flexible, the flexible plastic substrate may be applied to the lower substrate 100.

Although not shown in the drawing, the lower substrate 100 includes a plurality of gate lines and a plurality of data lines formed to cross each other.

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

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 gate insulating layer made of a nitride film (SiNx) may be positioned between the gate line and the data line.

A plurality of pixels is defined by the intersection of the plurality of gate lines and the plurality of data lines, and the TFT 110 and the pixel electrode 120 are formed to correspond to each pixel.

The gate electrode of the TFT 110 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 120.

The pixel electrode 120 is formed to correspond to the plurality of pixel regions defined by the partition wall 130, and applies a voltage to the pixel region by switching of the TFT 110.

The pixel electrode 120 is a conductive metal layer and is electrically connected to the drain electrode of the TFT 110 through a contact hole and formed of a material of copper, aluminum, and indium tin oxide (ITO). Can be.

In addition, the pixel electrode 120 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 130 is formed to surround the pixel electrode 120 as illustrated in FIG. 3.

A filling space is formed for each pixel by the partition wall 130, and the electrophoretic dispersion is filled in the filling space thus formed to internalize the electrophoretic dispersion 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 150 of the electrophoretic dispersion from the partition 130.

The partition wall 130 is formed on the lower substrate to define a pixel area and to define a filling space in which the electrophoretic dispersion is filled. In this case, the partition wall 130 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 120.

Here, the partition wall 130 is formed through a photo lithography or mold printing process, and the partition wall 130 is formed of a non-polar organic material or a non-polar inorganic material so that the physical properties match the electrophoretic dispersion. Can be formed.

The electrophoretic dispersion is composed of a plurality of charged particles 150 charged with a positive (+) or negative (-) polarity and a second solvent 160 including a binder, the filling space defined by the partition wall 130 (Fill cell).

The charged particles 150 have red, blue, green, yellow, cyan, magenta, black, and white colors. Can be colored.

The second solvent 160 includes halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, and epoxides. , Vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids or poly chlorotrifluoroethylene polymers ) Materials can be used.

The electrophoretic dispersion is a die coating method, a casting method, a bar coating method, a slit coating method in a filling space (filling cell) defined by the partition wall 130. The ink may be filled by a dispensing method, a squeezing 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, an electrophoretic dispersion composed of the plurality of charged particles 150 and the second solvent 160 is filled in the pixel area defined by the partition wall 130. Through this, the electrophoretic layer is internalized in the lower substrate 100.

The wiper cleaner 300 is formed on the partition wall 130.

Referring to FIG. 4, the wiper cleaner 300 is formed to correspond to a carrier glass used as a mother substrate during a manufacturing process, and includes a hole 310 that exposes a pixel region defined by the partition wall 130. After manufacturing of the electrophoretic display device is completed, the wiper cleaner 300 is removed from the outer portion of the display panel and is formed in an area corresponding to the partition wall 130.

The wiper cleaner 300 contaminates the outer part of the display panel due to the filling of the electrophoretic dispersion and the overflow of the electrophoretic dispersion when the lower substrate 100 and the upper substrate 200 are bonded together, thereby preventing color mixing between the pixels. It is to.

The wiper cleaner 300 is formed to have a thickness of about 1 μm to about 10 μm to absorb the second solvent 160 overflowing the partition 130.

Here, the filling of the electrophoretic dispersion is made in the first and second, the alignment of the mask (not shown), the pixel region is opened on the partition wall 130, the charged particles 150 and the first solvent ( First fill with filling solvent). The first solvent is used for filling the charged particles 150 in the pixel region.

Thereafter, the first solvent is volatilized, and the second solvent 160 (pixel solvent) for driving the charged particles 150 is secondarily filled in the pixel region using the mask. The second solvent is used for the purpose of driving the charged particles 150.

In the second filling process, the second solvent 160 may overflow into the neighboring pixel area on the back surface of the mask (not shown). At this time, when the second solvent 160 overflows into the neighboring pixel region, the upper part of the partition wall 130 is contaminated, and the charged particles 150 colored in the color to be displayed by the pixel also overflow into the neighboring pixel region. Color mixing can occur.

In the electrophoretic display according to the exemplary embodiment of the present invention, the wiper cleaner 300 is positioned above the partition 130 to absorb the second solvent 160 overflowing to the neighboring pixels on the rear surface of the mask (not shown). do.

As described above, the second solvent 160 and the charged particles 150 may be prevented from overflowing the neighboring pixels through the wiper cleaner 300. The second solvent (each solvent) may be formed in each pixel region through the wiper cleaner 300. By filling the 160 in a uniform amount, the electrophoretic display may have a uniform driving characteristic.

In addition, color mixing can be prevented to increase the light reflectance and to increase the contrast ratio.

A sealant is applied to the outer portion of the TFT for bonding the lower substrate 100 and the upper substrate 200. When the second solvent 160 filled in the secondary overflows the outer portion of the TFT, the sealant melts to generate an air layer. Let's go.

As a result, the reflectance and contrast ratio may be lowered, and in some cases, the lower substrate 110 and the upper substrate 200 may not be smoothly bonded.

The electrophoretic display according to an exemplary embodiment of the present invention prevents the second solvent 160 from overflowing to the outer portion of the TFT through the wiper cleaner 300, thereby increasing the reflectance and contrast ratio and increasing the two substrates 100 and 200. Can be made smoothly.

Meanwhile, the wiper cleaner 300 may be completely removed from the upper part of the partition 130 after the second solvent 160 is filled in the pixel area. That is, the wiper cleaner 300 may be present on the partition 130 during the manufacturing process, but may not exist after the second solvent 160 is completely removed and completely removed to manufacture the electrophoretic display device.

Subsequently, the upper substrate 200 includes a common electrode 210.

Since the upper substrate 200 should be transparent in order to display an image, the upper substrate 200 is formed of a glass of transparent material or a material of flexible transparent plastic.

The common electrode 210 corresponds to the pixel electrode 120 of the lower substrate 100 to supply a common voltage to each pixel area. The common electrode 210 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 voltages applied to the common electrode 210 and the pixel electrode 120 of the upper substrate 200, and the charged particles 150 are formed by the electric field. Move within to implement the image.

The sealing layer 320 is formed between the lower substrate 100 and the upper substrate 200.

The sealing layer 320 is for bonding the lower substrate 100 and the upper substrate 200 and sealing the electrophoretic dispersion, and is located between the lower portion of the common electrode 210 and the wiper cleaner 300.

The sealing layer 320 may be formed of a material having a repulsion with the electrophoretic dispersion so that the electrophoretic dispersion does not overflow to neighboring pixels. The sealing layer 320 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 320 is vacuum deposition (CVD, Sputter) method, die coating method, casting method, bar 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, the sealing layer 320 may be vacuum deposited (CVD, sputter), die coating, cast, bar coating, slit coating, or dispense. ) Coating an organic or inorganic material under the common electrode 210 by using a squeezing method, a screen printing method, an inkjet printing method, or a gravure roll printing method. After curing, it may be formed by applying ultraviolet rays or heat.

The electrophoretic dispersion prevents the electrophoretic dispersion from overflowing to the filling spaces of other pixels through the sealing layer 320 formed of a material having an electrophoretic dispersion and a repulsive force, and the electrophoresis is performed by bonding the lower substrate 100 and the upper substrate 200 together. Seal the dispersion.

In addition, the sealing layer 320 prevents the charged particles 150 of the electrophoretic dispersion that is internalized in the lower substrate 100 directly contact the common electrode 210.

When the sealing layer 320 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.

Meanwhile, when the sealing layer 320 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.

When the electrophoretic display displays a full color image, colored charged particles may be filled to match the color displayed by the pixel. When the charged particles colored in red and filled in the red pixels overflow into neighboring blue pixels or green pixels, color images may not be realized.

In addition, when the second solvent 160 for driving the charged particles 150 overflows to neighboring pixels, the upper portion of the partition wall 130 is contaminated, and the light reflectance and contrast ratio are reduced.

An electrophoretic display according to an exemplary embodiment of the present invention uses the wiper cleaner 300 to prevent the electrophoretic dispersion from overflowing to neighboring pixels. In addition, the bonding between the lower substrate 100 and the upper substrate 200 is smoothly continued using the sealing layer 320. In addition, it is possible to prevent the penetration of air and moisture by sealing the electrophoretic dispersion that is internalized in the lower substrate (100).

As a result, the light reflectance and contrast ratio of the electrophoretic display device may be increased to improve display quality and to increase efficiency of a manufacturing process. In addition, stability and driving reliability of the charged particles 150 embedded in the lower substrate 100 may be improved.

In the above description, the lower substrate 100 and the upper substrate 200 are bonded to each other using the sealing layer 320. However, the lower substrate 100 and the lower substrate 100 may be formed using a lamination method without forming the sealing layer 320. The upper substrate 200 may be bonded to each other.

5 to 14 illustrate a method of manufacturing an electrophoretic display device according to an exemplary embodiment 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 14.

Referring to FIG. 5, a TFT 110 is formed on the lower substrate 100 to correspond to each of the plurality of pixel regions, and an insulating layer is formed to cover the TFT 110.

Thereafter, a conductive material such as copper, aluminum, or ITO is coated on the insulating layer, and then a photolithography process and an etching process are performed to form the pixel electrode 120 in each of the plurality of pixel regions.

The pixel electrode 120 may be formed by further stacking nickel and / or gold on the above-described materials of copper, aluminum, and indium tin oxide (ITO).

Here, the lower substrate 100 may be a glass substrate of a transparent material, a plastic substrate or a metal substrate having flexibility. Since the lower substrate 100 is located on the opposite side of the screen on which the image is displayed, the lower substrate 100 is not necessarily transparent. When the electrophoretic display is manufactured to be flexible, a flexible plastic substrate may be applied to the lower substrate 100.

Although not shown in FIG. 5, a plurality of gate lines and data lines that cross each other are formed on the lower substrate 100. The TFT 110 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 110, the gate line is connected to the gate electrode of the TFT 110, and the drain electrode of the TFT 110 is electrically connected to the pixel electrode 120 through a contact hole. It is formed to be.

Next, referring to FIG. 6, after the organic material or the inorganic material is coated on the lower substrate 100 on which the pixel electrode 120 is formed, the partition wall 130 is formed to surround the pixel electrode 120.

In this case, a filling space (filling cell) in which the electrophoretic dispersion is filled through the partition 130 is defined. In this case, the partition wall may be formed to have a height of 10um ~ 100um and a width of 5um ~ 30um.

The partition 130 may be formed using not only the photo lithography method described above but also an imprinting or mold printing method.

Subsequently, referring to FIG. 7, the wiper cleaner 300 is formed on the partition wall 130.

The wiper cleaner 300 is formed to correspond to the carrier glass used as the mother substrate during the manufacturing process, and as illustrated in FIG. 4, the wiper cleaner 300 includes a hole 310 exposing the pixel region defined by the partition wall 130. .

After the wiper cleaner 300 is completely manufactured, the outer portion of the display panel is removed, and the wiper cleaner 300 remains in an area corresponding to the partition wall 130. The wiper cleaner 300 is formed to have a thickness of about 1 μm to about 10 μm to absorb the second solvent 160 overflowing the partition 130.

The wiper cleaner 300 contaminates the outer part of the display panel due to the filling of the electrophoretic dispersion and the overflow of the electrophoretic dispersion when the lower substrate 100 and the upper substrate 200 are bonded together, thereby preventing color mixing between the pixels. It is to.

In the electrophoretic display device according to an exemplary embodiment of the present invention, since the wiper cleaner 300 is positioned above the partition wall 130, the second solvent overflows to the neighboring pixels on the back surface A of the mask 330 shown in FIG. 11. Absorb 160.

The electrophoretic display device according to an embodiment of the present invention prevents the second solvent 160 from overflowing to the outer portion of the TFT through the wiper cleaner 300, thereby mixing the second solvent 160 to increase the reflectance and contrast ratio. The two substrates 100 and 200 may be bonded to each other smoothly.

In the manufacturing method of the electrophoretic display device according to the embodiment of the present invention, the filling of the electrophoretic dispersion is made in the first and second.

First, the mask in which the pixel region is opened is aligned on the partition wall 130, and the charged particles 150 and the first solvent (filling solvent) are first filled together. Here, the first solvent is used for filling the charged region 150 in the pixel region.

Thereafter, the first solvent is volatilized, and the second solvent 160 (pixel solvent) for driving the charged particles 150 is secondarily filled in the pixel region using the mask.

Specifically, referring to FIG. 8, the charged particles 150 and the first solvent charged in the positive (+) or negative (−) polarity in each of the entire pixel areas (filling cells) defined by the partition wall 130 ( 140, fill solvent) is first filled with an electrophoretic dispersion.

The mask 330 that opens only pixels of a specific color among all the pixels is aligned on the partition wall 130. Thereafter, the electrophoretic dispersion composed of the charged particles 150 and the first solvent 140 is filled in the pixels by a screen printing method using a squeeze bar 340.

At this time, the volume ratio of the first solvent 140 in the electrophoretic dispersion is 10 to 30%, the volume ratio of the charged particles 150 is 70 to 90%, the first solvent 140 has a viscosity of 100cP ~ 100kcP. . The primary filling process of the electrophoretic dispersion may consist of a squeegee speed of 5-50 [mm / sec] and a pressure of 0.1-30 [kgf] squeegee.

In the prior art, although the evaporation rate of the solvent was fast, there was a limitation in filling the electrophoretic dispersion at atmospheric pressure. 150) can be made to fill.

When the electrophoretic display implements full color, the charged particles 150 are colored in a color corresponding to the color to be displayed by each cell. Accordingly, the primary filling process of the electrophoretic dispersion composed of the charged particles 150 and the first solvent 140 may be sequentially performed for each color of the colored charged particles 150.

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. Filling of the electrophoretic dispersion per pixel may be performed sequentially.

Here, the first solvent 140 has a nonpolar characteristic. At this time, when the electrophoretic dispersion is filled, the ground electrode GND is supplied to the pixel electrode 120. Meanwhile, when the electrophoretic dispersion is filled, a driving voltage of + 5V to + 15V may be supplied to the pixel electrode 120.

Meanwhile, in addition to the screen printing method, the electrophoretic dispersion primary filling process is a die coating method, a casting method, a bar coating method, a slit coating method, a dispensing method, and the like. A squeezing method, a method, and an inkjet printing method may also be used.

Herein, the charged particles 150 may be colored in red, blue, green, yellow, cyan, magenta, black, and white. Optionally, it may be colored, and FIG. 8 illustrates that the charged particles 150 are colored in red, blue, green, and black.

Here, the first solvent 140 of the electrophoretic dispersion is halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers ), Epoxides, vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids, polychlorotrifluoro Poly chlorotrifluoroethylene polymers materials may be used.

In this case, the first solvent 140 is used only for filling the charged cells 150 of the red, green, and blue colors in the filling cell of the color pixel, and may apply a material suitable for the filling method described above. have.

For example, solvents may be used when the electrophoretic dispersion is filled in a filling cell using an inkjet method, and a material without dissolution and precipitation may be used in consideration of the reactivity of charged particles according to each filling method. Can be. In addition, a highly volatile material may be used as the first solvent 140 in a subsequent process to facilitate the volatilization time and complete volatilization of the first solvent 140.

In the above description, the charged particles 150 have been colored in red, green, and blue colors in the primary filling process as an example. However, yellow, cyan, The same may be applied to the case of coloring with magenta.

As such, the charged particles 150 and the first solvent 140 are filled for each color pixel to complete primary filling of the electrophoretic dispersion in all the pixels as illustrated in FIG. 9.

Subsequently, referring to FIG. 10, after charged particles are filled in each of the red pixels, the green pixels, and the blue pixels, a drying process is performed to volatilize the first solvent 140. At this time, only part of the first solvent 140 may be volatilized, or may be completely volatilized.

At this time, the drying process is performed for 1 minute to 24 hours so that the first solvent 140 filled in the entire pixel region is volatilized.

As an example, when the volume of the pixel region (fill cell) is 1.35 × 10 −4 cc, the drying process of the first solvent 140 may be performed within 20 minutes. In addition, in order to increase the efficiency of the drying process, a temperature of 150 ° C. or less may be added to increase the volatilization rate of the first solvent 140 and completely volatilize the first solvent 140 in the entire pixel region.

However, this is an example of a drying process. When the volatility of the first solvent 140 is high and the volume of the pixel region is small, the drying process may be further shortened.

On the other hand, when the volatility of the first solvent 140 is low and the volume of the pixel region is large, the drying process may be further extended. Therefore, the drying time proceeds for a proper time for the first solvent 140 to be completely volatilized in consideration of the volatilization characteristics of the first solvent 140 and the volume of the pixel region.

Subsequently, referring to FIG. 11, after the first solvent 140 is completely volatilized, the second solvent 160 is formed by using the injection equipment 250 while the charged particles 150 are filled in each pixel region. The entire pixel area is filled.

In this case, the second solvent 160 may be simultaneously filled in all the pixels, and as shown in FIG. 11, the second solvent 160 may be sequentially filled for each pixel using the mask 300. .

As such, in the process of filling the second solvent 160, the second solvent 160 may overflow the upper portion of the barrier 130 through the back surface A of the mask 330 and overflow to neighboring pixels. The wiper cleaner 300 is formed on the partition wall 130 to prevent the second solvent 160 from overflowing to neighboring pixels.

Here, the second solvent 160 may have a viscosity of 1 cP to 100 cP.

As such, the second solvent 160 having the viscosity of 1 cP to 100 cP is filled in the pixel region in which the charged particles 150 are filled so that the charged particles 150 may be driven by electrophoresis.

In this case, the second solvent 160 is halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides (epoxides), vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, toluene, naphthalene, liquid paraffinic liquids, polychlorotrifluoroethylene polymers ( poly chlorotrifluoroethylene polymers) materials may be used.

As illustrated in FIG. 11, the second solvent 160 is not only a dispense method using the injection equipment 350 but also a die coating method, a casting method, and a bar coating method. ), A slit coating method, a squeezing method, a screen printing method, or an inkjet printing method may be filled in each pixel area.

In this case, the second solvent 160 does not necessarily need to be the same material as the first solvent 140, and the first solvent 140 and the second solvent 160 may be different materials depending on the filling method. have.

Meanwhile, the wiper cleaner 300 may be completely removed from the upper part of the partition 130 after the second solvent 160 is filled in the pixel area. That is, the wiper cleaner 300 may be present on the partition 130 during the manufacturing process, but may not exist after the second solvent 160 is completely removed and completely removed to manufacture the electrophoretic display device.

In this case, after the wiper cleaner 300 is completely removed, the second solvent 160 that may remain on the partition 130 may be removed through a cleaning process described below with reference to FIG. 13.

Next, referring to FIG. 12, a sealant is coated on the partition 130 to form a sealing layer 320. Through the sealing layer 320 to seal the partition 130 and the electrophoretic dispersion liquid.

In this case, the sealing layer 320 bonds the lower substrate 100 and the upper substrate 200 formed in the manufacturing process described below, as well as the sealing of the electrophoretic dispersion.

The sealing layer 320 may be formed of a material having a repulsion with the electrophoretic dispersion so that the electrophoretic dispersion does not overflow to neighboring pixels. The sealing layer 320 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 320 is vacuum deposition (CVD, Sputter) method, die coating method, casting method, bar 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, referring to FIG. 13, after the sealing layer 320 is formed on the lower substrate 100, the second solvent 160 that is not completely absorbed by the wiper cleaner 300 using the cleaning equipment 360 is used. Clean. As such, the second solvent 160 remaining on the lower substrate 100 may be cleaned to prevent contamination of the lower substrate 100.

Subsequently, referring to FIG. 14, the common electrode 210 is formed on the upper substrate 200, and the lower substrate 100 and the upper substrate 200 are bonded to each other using the sealing layer 320.

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 common electrode 210 may be formed of a conductive transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on a glass of transparent material or a substrate of flexible transparent plastic. ).

The common electrode 210 corresponds to the pixel electrode 120 and supplies a common voltage to each pixel region for driving the charged particles 150.

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, the sealing layer 320 is not formed on the lower substrate 100, but is formed on the common electrode 210 of the upper substrate 200, and then the lower substrate 100 and the upper substrate 200 are bonded to each other. It may be.

In addition, the sealing layer 320 may be manufactured in the form of a film, and then the upper substrate 100 and the lower substrate 200 may be bonded using a lamination process.

As such, the lower substrate 100 and the upper substrate 200 are bonded to each other using the sealing layer 320, so that the display area may be completely shielded. Accordingly, a defect in which the electrophoretic display is contaminated by external air and moisture can be prevented, and mass production and reliability of the electrophoretic display can be improved.

The electrophoretic display device in which the electrophoretic dispersion is embedded in the lower substrate 100 may be manufactured by performing the above-described manufacturing process.

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 120 and the common voltage applied to the common electrode 210. The charged particles 150 of the filled electrophoretic dispersion may move in the solvent 160 to realize a mono image and a color image.

The method of manufacturing an electrophoretic display device according to an exemplary embodiment of the present invention may increase the light reflectance and increase the contrast ratio by preventing the electrophoretic dispersion from overflowing during the manufacturing process.

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 that 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 existing manufacturing process of the 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: TFT
120 pixel electrode 130 partition wall
140: first solvent 150: charged particles
160: second solvent 200: upper substrate
210: common electrode 300: wiper cleaner
310: hole 320: sealing layer
330: mask 340: squeegee bar
350: injection equipment 360: cleaning equipment

Claims (12)

Barrier ribs formed around the pixel electrodes formed on the lower substrate to define a plurality of pixel regions;
An electrophoretic dispersion filled with a pixel region in which the lower inter layer is formed, including a plurality of charged particles colored to display a specific color;
A wiper cleaner formed on the partition wall;
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 1,
The wiper cleaner absorbs the electrophoretic dispersion overflowing the upper part of the partition wall in a manufacturing process, thereby preventing contamination of the upper part of the partition wall. The method of claim 1,
The wiper cleaner absorbs the electrophoretic dispersion overflowed to neighboring pixels in the manufacturing process, thereby preventing contamination and color mixing of the pixels. The method of claim 1,
And the wiper cleaner is formed with a hole exposing the pixel area. The method of claim 1,
The sealing layer is electrophoretic display characterized in that the sealing material having an electrophoretic dispersion and a repulsion (repulsion) is coated on the partition or the common electrode, and then hardened. The method of claim 3, wherein
The barrier rib and the sealing layer are electrophoretic display devices, characterized in that formed of non-conductive organic or inorganic material that does not cause chemical interaction with the electrophoretic dispersion. Forming a partition wall to surround the plurality of pixels of the lower substrate;
Forming a wiper cleaner having a hole exposing the pixel on the partition wall;
Filling an electrophoretic dispersion including a plurality of charged particles and a solvent colored to display a specific color in a pixel region defined by the partition wall;
Forming a common electrode on the upper substrate;
Forming a sealing layer on the barrier rib or on the common electrode; And
And bonding the lower substrate and the upper substrate by using the sealing layer. The method of claim 7, wherein
And the wiper cleaner absorbs the electrophoretic dispersion overflowing the upper portion of the barrier rib during filling of the electrophoretic dispersion, thereby preventing contamination of the upper portion of the barrier rib. The method of claim 7, wherein
The wiper cleaner absorbs the electrophoretic dispersion overflowed to neighboring pixels in the process of filling the electrophoretic dispersion, thereby preventing contamination and color mixing of the pixels. The method of claim 7, wherein
The wiper cleaner is formed to correspond to the carrier glass used as the mother substrate during the manufacturing process,
And after the manufacturing of the electrophoretic display device is completed, the wiper cleaner is removed from an outer portion of the display panel and formed in an area corresponding to the partition wall. The method of claim 7, wherein
In the step of filling the electrophoretic dispersion,
Firstly charging charged particles and a first solvent in the pixel region;
Volatilizing the first solvent;
Secondary filling the pixel region with a second solvent;
The first solvent is a filling solvent for filling the charged particles,
And the second solvent is a driving solvent for driving the charged particles. The method of claim 11,
And filling the upper substrate with the second solvent, and then cleaning the upper portion of the lower substrate.
KR1020110081173A 2011-08-16 2011-08-16 Electrophoretic display device and manufacturing method the same KR20130019180A (en)

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