KR20130067582A - Electrophoretic display device and method for manufacturing the same - Google Patents

Electrophoretic display device and method for manufacturing the same Download PDF

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Publication number
KR20130067582A
KR20130067582A KR1020110134291A KR20110134291A KR20130067582A KR 20130067582 A KR20130067582 A KR 20130067582A KR 1020110134291 A KR1020110134291 A KR 1020110134291A KR 20110134291 A KR20110134291 A KR 20110134291A KR 20130067582 A KR20130067582 A KR 20130067582A
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South Korea
Prior art keywords
substrate
adhesive layer
electrophoretic
intermediate layer
display device
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KR1020110134291A
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Korean (ko)
Inventor
이정원
백승한
이민혁
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110134291A priority Critical patent/KR20130067582A/en
Publication of KR20130067582A publication Critical patent/KR20130067582A/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
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Abstract

An electrophoretic display device according to an aspect of the present invention, which does not use an electrophoretic film, includes: a barrier rib formed on a first substrate; An electrophoretic dispersed solution filled in a plurality of unit pixel regions defined by the barrier ribs; An intermediate layer in contact with the electrophoretic dispersion in the plurality of unit pixel regions to seal the plurality of unit pixel regions; And an adhesive layer formed on a second substrate bonded to the first substrate, the adhesive layer including a first region to which the partition wall is bonded and a second region to which the intermediate layer is bonded.

Description

Electrophoretic Display Device and Method for Manufacturing The Same

The present invention relates to an electrophoretic display device, and more particularly, to an electrophoretic display device and a method of manufacturing the same that can reduce power consumption.

An electrophoretic display device (EPD) refers to a device for displaying an image by using electrophoretic 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 charged particles move in a liquid by a coulomb force when an electric field is applied to an electrophoretic dispersion liquid in which charged particles are dispersed in a liquid.

Such an electrophoretic display has a bisability, so that the original image can be preserved for a long time even if the applied voltage is removed. That is, the electrophoretic display device can maintain a constant screen for a long time even without applying a voltage continuously, and thus is particularly suitable for the field of the e-book which does not require rapid replacement of the screen.

In addition, unlike a liquid crystal display, an electrophoretic display device has no dependency on a viewing angle and has an advantage of providing an image that is comfortable to the eye to a degree similar to paper.

1 is a view schematically showing the configuration of such a general electrophoretic display device. As shown in FIG. 1, the unidirectional electrophoretic display 100 includes an upper substrate 110 on which a common electrode (not shown) is formed, and a lower substrate on which a thin film transistor (TFT) array (not shown) is formed. 120, and an electrophoretic film 130 positioned between the upper substrate 110 and the lower substrate 120.

The electrophoretic film 130 includes a plurality of microcapsules 131. The microcapsules 131 include a dielectric solvent 1311, positively charged black particles 1312 dispersed in the dielectric solvent 1311, and negatively charged white particles 1313 dispersed in the dielectric solvent 1311. It includes. The black particles 1312 and the white particles 1313 can display an image by moving in the dielectric solvent 1311 by a Coulomb force when an electric field is applied.

Since the general electrophoretic display device 100 having the above-described configuration uses the electrophoretic film 130 which is an expensive product, there is a problem in that the manufacturing cost increases. Therefore, it is necessary to develop a new type electrophoretic display device 100 that does not use the electrophoretic film 130.

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 which does not use an electrophoretic film and a manufacturing method thereof.

Another object of the present invention is to provide an electrophoretic display device and a method of manufacturing the same, which can improve the conformability of an electrophoretic dispersion.

Electrophoretic display device according to an aspect of the present invention for achieving the above object is a partition formed on the first substrate; An electrophoretic dispersed solution filled in a plurality of unit pixel regions defined by the barrier ribs; An intermediate layer in contact with the electrophoretic dispersion in the plurality of unit pixel regions to seal the plurality of unit pixel regions; And an adhesive layer formed on a second substrate bonded to the first substrate, the adhesive layer including a first region to which the partition wall is bonded and a second region to which the intermediate layer is bonded.

According to still another aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, the method including: forming a partition on a first substrate; Filling an electrophoretic dispersion into a plurality of unit pixel regions defined by the partition walls; Forming an adhesive layer on the second substrate; Forming an intermediate layer on the adhesive layer; And aligning and bonding the first substrate and the second substrate so that the partition penetrates the intermediate layer and adheres to the adhesive layer.

According to the present invention, the electrophoretic dispersion is filled in the spaces between the partition walls instead of the electrophoretic film, thereby reducing the manufacturing cost of the electrophoretic display device.

In addition, according to the present invention by forming the upper sealing member for bonding the upper substrate and the lower substrate divided into the intermediate layer and the adhesive layer can prevent the charging particles contained in the electrophoretic dispersion adhere to the adhesive layer to ensure the consistency of the electrophoretic dispersion This can improve the reflectance of the electrophoretic display device.

1 is a view schematically showing a configuration of a general electrophoretic display device.
2 is a view schematically showing the configuration of an electrophoretic display device according to an embodiment of the present invention.
3A to 3G illustrate a manufacturing process of an electrophoretic display device according to an exemplary embodiment of the present invention.

Hereinafter, 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 "below" another structure, this description is intended to provide a third term between these structures as well as when the structures are in contact with each other. It is to be interpreted as including even if the structure is interposed. However, if the terms "directly above" or "directly below" are used, these structures should be construed as limited to being in contact with each other.

2 is a diagram schematically illustrating a configuration of an electrophoretic display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the electrophoretic display device 200 according to an exemplary embodiment of the present invention includes a lower substrate 210, a partition wall 220, an electrophoretic dispersion 230, an upper substrate 240, and a common substrate. An electrode 250, an adhesive layer 260, and an intermediate layer 270.

Although not illustrated in FIG. 2, the lower substrate 210 includes a TFT substrate on which thin film transistors (TFTs) are formed for each pixel, and a plurality of pixel electrodes formed on the TFT substrate corresponding to the TFTs. do.

The TFT substrate includes a gate line (not shown) and a data line (not shown) intersected on the substrate (not shown).

The substrate may be a glass substrate, but a plastic substrate or a metal substrate may be used as the substrate in order for the electrophoretic display 200 to have flexibility. The substrate does not need to be transparent because it is located on the side opposite to the surface on which the image is displayed.

The gate line and the data line are single films made of silver (Ag), aluminum (Al), or alloys thereof having low resistivity, or in addition to these single films, chromium (Cr) having excellent electrical characteristics, The multilayer film may further include a film made of titanium (Ti) or tantalum (Ta).

Although not shown in FIG. 2, a gate insulating film made of a nitride film (SiNx) or the like is positioned between the gate line and the data line, and a TFT is formed at each intersection of the gate line and the data line. The TFT further includes a gate electrode branched from the gate line, a semiconductor layer formed on the gate insulating film in a portion corresponding to the gate electrode, a source electrode branched from the data line, and a drain electrode. The source electrode and the drain electrode are formed to be spaced apart from each other on the gate insulating film and the semiconductor layer, and partially overlap the semiconductor layer. The TFT may further include an ohmic contact layer between the source electrode and the semiconductor layer and between the drain electrode and the semiconductor layer.

A protective layer made of a nitride film (SiNx) or the like is formed on the entire surface of the substrate including the TFT, and a pixel electrode corresponding to each pixel is formed on the protective layer. The pixel electrode is connected to the drain electrode of the corresponding TFT through a contact hole formed in the protective layer. Copper, aluminum, ITO, or the like may be used for the manufacture of the pixel electrode, and nickel and / or gold may be further stacked thereon.

Next, the partition wall 220 is formed on the lower substrate 210, and as shown in FIG. 2, the partition wall 220 includes a plurality of unit pixel regions 222 on the lower substrate 210. define. In an exemplary embodiment, the partition wall 220 may be formed in a lattice shape, and a plurality of unit pixel areas 222 may be defined therein.

The partition wall 220 may be formed through a photolithography or mold printing process.

In one embodiment, the partition wall 220 may be formed by patterning a material including an acrylic-based or epoxy-based polymer.

Further, the partition wall 220 may be formed to have a height of 10 μm to 100 μm, preferably 30 μm to 40 μm, and to have a line width of 5 μm to 30 μm, preferably 9 μm to It can be formed to have a line width of 16㎛.

In one embodiment, the partition wall 220 may be formed in a shape having a line width different from the top and bottom. For example, the partition wall 220 may have a line width at an upper end of 9 μm to 10 μm and a lower end at a line width of 15 μm to 16 μm.

Electrophoretic Dispersed Solution (230) is filled in a plurality of unit pixel regions 222 defined by the partition wall 220, and a plurality of agents dispersed in the dielectric solvent 232 and the dielectric solvent 232 One charged particle 234 and a plurality of second charged particles 236.

The first charged particles 234 and the second charged particles 236 may display an image by moving in the dielectric solvent 232 by a coulomb force when an electric field is applied. The first charged particles 234 and the second charged particles 236 are charged to have different polarities. For example, when the first charged particles 234 are negatively charged (-), the second charged particles 236 may be positively charged (+).

The first charged particles 234 and the second charged particles 236 may be formed to have different colors. For example, when the first charged particles 234 have a white color, the second charged particles 236 may have a black color.

Although not shown, when manufacturing an electrophoretic display device for displaying color images, the first charged particles 234 may be formed of red, blue, green, yellow, and cyan. ), Magenta (Magenta), black, or white color, and the second charged particles 236 may have a black color. In an exemplary embodiment, four unit pixel areas may constitute one pixel area to implement a specific color.

For example, an electrophoretic dispersion 230 including first charged particles 234 having a red color and second charged particles 236 having a black color may be filled in the first unit pixel area. The electrophoretic dispersion 230 including the first charged particles 234 having a green color and the second charged particles 236 having a black color may be filled in the second unit pixel area. An electrophoretic dispersion 230 including first charged particles 234 having a blue color and second charged particles 236 having a black color may be filled in the third unit pixel area. The fourth unit pixel region may be filled with an electrophoretic dispersion 230 including first charged particles 234 having a white color and second charged particles 236 having a black color. Although not shown, the electrophoretic dispersion 230 may be configured to include a dielectric solvent 232 including a black dye in place of the first charged particles 236 having a black color.

The electrophoretic dispersion 230 is a die coating method, a casting method, a bar coating method, a slit coating method, a dispensing method, a squeezing method Each of the unit pixel areas 222 may be filled using any one of a screen printing method, an inkjet printing method, and an inkjet printing method.

Next, the upper substrate 240 is bonded to face the lower substrate 210, it may be made of glass or plastic, the common electrode 250 is formed on the upper substrate 240, ITO (Indium Tin Oxide) Or IZO (Indium Zinc Oxide).

Next, the adhesive layer 260 is formed on the common electrode 250 to serve to bond the upper substrate 240 and the lower substrate 210. As shown in the enlarged view of FIG. 2, the adhesive layer 260 includes a first region 262 to which the partition wall 220 formed on the lower substrate 210 is bonded and a second region to which the intermediate layer 270 is bonded. 264).

That is, the partition wall 220 formed by penetrating a part of the intermediate layer 270 is bonded to the first region 262 of the adhesive layer 260, and the intermediate layer 270 is bonded to the second region 264 of the adhesive layer 260. do. As described above, in the present invention, the partition wall 220 is bonded to the adhesive layer 260, but the electrophoretic dispersion 230 filled in the unit pixel region 222 does not contact the adhesive layer 260, and thus the electrophoretic dispersion 230 The charging particles 234 and 246 included in the C) may be prevented from adhering to the adhesive layer 260.

In one embodiment, the adhesive layer 260 may be formed of an organic or inorganic material having adhesiveness and electrical insulation. For example, the adhesive layer 260 may be formed of a material including a fluorine material or a fluorine polymer.

Meanwhile, the adhesive layer 260 may be formed to have a thickness of 2 μm to 5 μm. If the thickness of the adhesive layer 260 is thinner than 2 μm, the partition wall 220 may penetrate the adhesive layer 260 to contact the common electrode 250. If the thickness of the adhesive layer 260 is thicker than 5 μm, This is because the thickness of the electrophoretic display device 200 becomes too thick.

Next, the intermediate layer 270 is formed on the second region 264 of the adhesive layer 260, and contacts the electrophoretic dispersion 230 in the unit pixel region 222 to contact the unit pixel region 222. Seal it. Through the intermediate layer 270, the electrophoretic dispersion 230 filled in the unit pixel region 222 is prevented from invading into the neighboring unit pixel region 222.

In one embodiment, the intermediate layer 270 may be formed to a thickness of 0.5㎛ ~ 1㎛. This is because when the thickness of the intermediate layer 270 is thinner than 0.5 μm, the partition wall 220 may penetrate not only the intermediate layer 270 but also the adhesive layer 260 to contact the common electrode 250. This is because when the thickness is greater than 1 μm, the partition wall 220 may not penetrate the intermediate layer 270.

Meanwhile, the intermediate layer 270 may be formed of a material having repulsive force with the charged particles 234 and 236 included in the electrophoretic dispersion 230, that is, an organic or inorganic material having low adhesiveness and high electrical insulation. For example, when the intermediate layer 270 is formed of an organic material, the intermediate layer 270 may be coated with a polymer, an acrylic UV curable resin, or an organic self-assembled monolayer (organic SAM layer). Transparent organic materials and the like can be used as the material.

As another example, when the intermediate layer 270 is formed of an inorganic material, the intermediate layer 270 may be formed of silicon nitride (SiN x ), amorphous silicon (a-Si), silicon oxide (SiO x ), aluminum oxide (Al 2 O 3 ), or Non-conductive transparent inorganic materials and the like can be used as the material.

As described above, in the electrophoretic display device 200 according to the present invention, the partition wall 220 is bonded to the adhesive layer 260, but the electrophoretic dispersion 230 does not contact the adhesive layer 260, and thus the electrophoretic dispersion ( The charged particles 234 and 236 included in the 230 may be prevented from adhering to the adhesive layer 260, thereby improving the reflectance of the electrophoretic display 200, and the partition wall 220 may be attached to the adhesive layer 260. Since the direct bonding, the bonding force of the lower substrate 210 and the upper substrate 240 can be increased.

Hereinafter, a manufacturing process of an electrophoretic display device according to an exemplary embodiment will be described in more detail with reference to FIG. 3.

3A to 3G are cross-sectional views illustrating a manufacturing process of an electrophoretic display device according to an exemplary embodiment of the present invention.

As shown in FIG. 3A, first, a lower substrate 210 is manufactured. At this time, although not shown, the lower substrate 210 may be formed by the following process.

First, a metal film is deposited on a substrate, and then the metal film is selectively patterned through a photolithography process and an etching process to form a gate line and a gate electrode branched from the gate line. Thereafter, a gate insulating film is formed on the substrate including the gate line and the gate electrode by using a nitride film (SiNx), and a semiconductor layer (not shown) and an impurity layer (not shown) are sequentially formed on the gate insulating film. The impurity layer and the semiconductor layer are selectively patterned by a photolithography process and an etching process to form a semiconductor layer and an ohmic contact layer.

Thereafter, a metal material for forming a data line is deposited on a substrate including a semiconductor layer and an ohmic contact layer, and then selectively patterned through a photolithography process and an etching process to form a data line, a source electrode branched from the data line, And a drain electrode spaced apart from the source electrode at a predetermined interval. Through this process, a TFT which is a switching element composed of a source electrode, a drain electrode, an active layer, and a gate electrode is formed.

Thereafter, a protective layer is formed on the entire surface of the substrate on which the TFT is formed, and the protective layer is selectively patterned to form a contact hole exposing a portion of the drain electrode. Thereafter, a metal material made of a transparent conductive material such as ITO or IZO is deposited on the protective layer including the contact hole. The lower substrate 210 is manufactured by forming pixel electrodes that are electrically connected.

Referring again to FIG. 3B, a partition wall 220 defining a plurality of unit pixel regions is formed on the lower substrate 210. For example, the partition wall 220 may be formed in a lattice shape, and a plurality of unit pixel areas 222 may be defined therein.

In one embodiment, the partition wall 220 may be formed through a photolithography or mold printing process using a material including an acrylic-based or epoxy-based polymer.

At this time, the partition wall 220 may be formed to have a height of 10㎛ ~ 100㎛, preferably having a height of 30㎛ ~ 40㎛, preferably to have a line width of 5㎛ ~ 30㎛, preferably 9㎛ ~ It can be formed to have a line width of 16㎛.

In one embodiment, the partition wall 220 may be formed in a shape having a line width different from the top and bottom. For example, the partition wall 220 may have a line width at an upper end of 9 μm to 10 μm and a lower end at a line width of 15 μm to 16 μm.

Next, as illustrated in FIG. 3C, a filling solvent including a plurality of charged particles 234 and 236 and a first solvent 300 in the plurality of unit pixel regions 222 defined by the partition wall 220 ( 310).

In one embodiment, the filling solvent 310 may be a die coating method, a casting method, a bar coating method, a slit coating method, a dispensing method, a spray method. The unit pixel area 222 may be filled using any one of a squeezing method, a screen printing method, and an inkjet printing method.

In this case, the plurality of charged particles 234 and 236 may include first charged particles 234 and second charged particles 236 having polarities opposite to each other. In an exemplary embodiment, when the electrophoretic display displays a mono image, one of the first charged particles 234 and the second charged particles 236 has a white color, and the other one has a black color. Black) can have color. In another embodiment, when the electrophoretic display displays a color image, any one of the first charged particles 234 and the second charged particles 236 may be red, blue, or green. ), Yellow, yellow, cyan, magenta, black, or white, and the other may have a black color.

In addition, the first solvent 300 may include halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, and epoxides. (Epoxides), vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids, or polychlorotrifluoroethylene polymers ( Poly Chlorotrifluoroethylene Polymers) may be at least one material.

Next, as illustrated in FIG. 3D, the first solvent 300 is removed from the filling solvent 310 filled in the plurality of unit pixel regions 222 through a drying process. In one embodiment, the drying process may be carried out at 60 ℃ to 100 ℃ for 30 minutes to 4 hours. In this drying process, the first solvent 310 is removed in each unit pixel region 222, and the plurality of charged particles 234 and 236 are solidified and remain.

Next, as shown in FIG. 3E, the second solvent 232 is filled in the plurality of unit pixel regions 222 defined by the partition wall 220. In an embodiment, the second solvent 232 filled in the unit pixel region 222 may be the same material as the first solvent 300, but may have a lower viscosity than the first solvent 300.

In the above-described embodiment, as a method of filling the electrophoretic dispersion 230 in the unit pixel region 222, after filling the filling solvent 310 in the unit pixel region 222, the first solvent 300 is removed, Although again described as injecting the second solvent 232, in the modified embodiment, the electrophoretic dispersion 230 including the plurality of charged particles 234 and 236 and the second solvent 232 may be directly The unit pixel area 222 may be filled.

Next, apart from the process illustrated in FIGS. 3A to 3E, as illustrated in FIG. 3F, the common electrode 250, the adhesive layer 260, and the intermediate layer 270 are sequentially formed on the upper substrate 240. do.

In this case, the upper substrate 240 may be made of transparent glass or flexible plastic, and the common electrode 250 may be formed of indium tin oxide (ITO) or indium zinc oxide (IZO). It may be formed of a conductive transparent material such as Indium Zinc Oxide.

In one embodiment, the adhesive layer 260 may be formed to a thickness of 2㎛ 5㎛. This is because when the thickness of the adhesive layer 260 is thinner than 2 μm, the partition wall 220 may penetrate to the adhesive layer 260 to contact the common electrode 250, and the thickness of the adhesive layer 260 may be thicker than 5 μm. This is because the thickness of the surface electrophoretic display 200 becomes too thick.

According to this embodiment, the adhesive layer 260 may be formed of an organic or inorganic material having adhesiveness and electrical insulation. For example, the adhesive layer 260 may be formed of a material including a fluorine material or a fluorine polymer.

In one embodiment, the intermediate layer 270 may be formed to a thickness of 0.5㎛ ~ 1㎛. This is because when the thickness of the intermediate layer 270 is thinner than 0.5 μm, the partition wall 220 may penetrate not only the intermediate layer 270 but also the adhesive layer 260 to contact the common electrode 250. This is because when the thickness is greater than 1 μm, the partition wall 220 may not penetrate the intermediate layer 270.

According to this embodiment, the intermediate layer 270 may be formed of an organic or inorganic material having low adhesion and high electrical insulation. For example, when the intermediate layer 270 is formed of an organic material, the intermediate layer 270 may be coated with a polymer, an acrylic UV curable resin, or an organic self-assembled monolayer (organic SAM layer). Transparent organic materials and the like can be used as the material.

As another example, when the intermediate layer 270 is formed of an inorganic material, the intermediate layer 270 may be formed of silicon nitride (SiN x ), amorphous silicon (a-Si), silicon oxide (SiO x ), aluminum oxide (Al 2 O 3 ), or Non-conductive transparent inorganic materials and the like can be used as the material.

In one embodiment, the above-described adhesive layer 260 and the intermediate layer 270, vacuum deposition (CVD, Sputter) method, die coating method (Casting) method, bar coating (Bar Coating) method, It may be formed by a slit coating method, a dispensing method, a squeezing method, a screen printing method, or an inkjet printing method.

Next, as shown in FIG. 3G, the upper substrate 240 on which the common electrode 250, the adhesive layer 260, and the intermediate layer 270 are formed is inverted, and the lower substrate is aligned with the alignment key. The 210 and the upper substrate 240 are bonded together to complete the electrophoretic display.

In the case of the present invention, when the lower substrate 210 and the upper substrate 240 are bonded, the partition wall 220 formed on the lower substrate 210 can penetrate the intermediate layer 270 to be directly bonded to the adhesive layer 260 In this embodiment, the partition wall 220 formed on the lower substrate 210 may penetrate the intermediate layer 270 to be directly bonded to the adhesive layer 260 through a bonding process using a laminating technique.

At this time, laminating may be performed under a temperature of 70 ℃ to 110 ℃ and pressure conditions of 300N / ㎠ ~ 350N / ㎠. When laminating is performed under such temperature and pressure conditions, as shown in FIG. 3G, the partition wall 220 formed on the lower substrate 210 penetrates the intermediate layer 270 and adheres to the adhesive layer 260.

As such, in the case of the present invention, the partition wall 220 penetrates the intermediate layer 270 to be adhered to the adhesive layer 260, and the electrophoretic dispersion 230 does not directly contact the adhesive layer 260 but only the intermediate layer 270. In order to make contact, the charged particles 234 and 236 included in the electrophoretic dispersion 230 may be prevented from adhering to the adhesive layer 260, thereby improving the reflectance of the electrophoretic display 200.

In addition, in the present invention, since the partition wall 220 is directly bonded to the adhesive layer 260, it is possible to increase the bonding force of the lower substrate 210 and the upper substrate 240.

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.

200: electrophoresis display device 210: lower substrate
220: bulkhead 230: electrophoretic dispersion
240: upper substrate 250: common electrode
260: adhesive layer 270: intermediate layer

Claims (11)

Barrier ribs formed on the first substrate;
An electrophoretic dispersed solution filled in a plurality of unit pixel regions defined by the barrier ribs;
An intermediate layer in contact with the electrophoretic dispersion in the plurality of unit pixel regions to seal the plurality of unit pixel regions; And
And an adhesive layer formed on a second substrate opposed to the first substrate, the adhesive layer including a first region to which the partition wall is bonded and a second region to which the intermediate layer is bonded. The method of claim 1,
And the intermediate layer is formed of a material having a repulsive force with a plurality of charged particles included in the electrophoretic dispersion. The method of claim 1,
The adhesive layer is formed of a material containing a fluorine-based material or a fluorine-based high molecular material electrophoretic display device. The method of claim 1,
The adhesive layer has a thickness of 2㎛ ~ 5㎛ electrophoretic display device. The method of claim 1,
The intermediate layer has an electrophoretic display device having a thickness of 0.5㎛ ~ 1㎛. Forming a partition on the first substrate;
Filling an electrophoretic dispersion into a plurality of unit pixel regions defined by the partition walls;
Forming an adhesive layer on the second substrate;
Forming an intermediate layer on the adhesive layer; And
And aligning the first substrate and the second substrate so that the partition penetrates the intermediate layer and adheres to the adhesive layer. The method according to claim 6,
In the step of aligning and bonding the first substrate and the second substrate,
A method of manufacturing an electrophoretic display device, comprising bonding the first substrate and the second substrate to each other using a laminating technique. The method according to claim 6,
In the step of aligning and bonding the first substrate and the second substrate,
A method of manufacturing an electrophoretic display device, wherein the first substrate and the second substrate are bonded to each other at a temperature of 70 ° C. to 110 ° C. and a pressure of 300 N / cm 2 to 350 N / cm 2. The method according to claim 6,
And the adhesive layer is formed to have a thickness of 2 μm to 5 μm. The method according to claim 6,
The intermediate layer is formed to have a thickness of 0.5 ㎛ ~ 1㎛ manufacturing method of an electrophoretic display device. The method according to claim 6,
Filling the electrophoretic dispersion,
Filling a filling solvent including a plurality of charged particles and a first solvent in the plurality of unit pixel regions;
Drying the peeling solvent to remove the first solvent; And
And filling a second solvent into the plurality of unit pixel regions.
KR1020110134291A 2011-12-14 2011-12-14 Electrophoretic display device and method for manufacturing the same KR20130067582A (en)

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