KR101841708B1 - Method for manufacturing electrophoretic display device - Google Patents

Abstract

The present invention relates to a manufacturing method of an electrophoretic display device capable of improving manufacturing efficiency and reliability of driving.
According to another aspect of the present invention, there is provided a method of manufacturing an electrophoretic display including: forming a plurality of pixel regions on a lower substrate and pixel electrodes corresponding to the plurality of pixel regions; Firstly filling an electrophoretic dispersion liquid composed of a charged particle and a first solvent colored in a specific color in a plurality of pixel regions defined by the partition wall; Performing a drying process to volatilize the first solvent filled in the plurality of pixel regions; Secondly filling the plurality of pixel regions with a second solvent so that the charged particles behave by electrophoresis; Sealing the top of the septum and the electrophoretic dispersion; And bonding the upper substrate and the lower substrate to each other.

Description

[0001] METHOD FOR MANUFACTURING ELECTROPHORETIC DISPLAY DEVICE [0002]

The present invention relates to an electrophoretic display device, and more particularly, to a method of manufacturing an electrophoretic display device capable of improving manufacturing efficiency and reliability of driving.

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

The electrophoretic display using electrophoresis has a characteristic of bistability, so that the original image can be displayed for a long time even when the applied voltage is removed. That is, the electrophoretic display device is suitable for the e-book field in which it is not required to swiftly change the screen because the electrophoretic display device can maintain a certain screen for a long time without continuously applying a voltage.

In addition, the electrophoretic display device has no dependency on the viewing angle, unlike the liquid crystal display device, and can provide a comfortable image on the eye to a degree similar to paper. In addition, demand is increasing as it has the advantages of flexing freely, flexibility, low power consumption and eco-like.

1 is a cross-sectional view showing a structure of an electrophoretic display device according to the related art.

Referring to FIG. 1, the electrophoretic display device according to the related art includes a lower substrate 10 and an upper substrate 20 facing each other, and an electrophoretic film (not shown) interposed between the lower substrate 10 and the upper substrate 20, (30).

The lower substrate 10 includes a plurality of pixel electrodes (not shown) opposed to the common electrode 22 formed on the upper substrate 20 and a plurality of thin film transistors (not shown) which are switching elements for applying a voltage to the plurality of pixel electrodes TFT, not shown).

The electrophoretic film 30 includes a plurality of microcapsules 32 composed of charged particles and a solvent and an adhesive layer 34 for protecting the microcapsules 32 and for bonding with the lower substrate 10, Layer).

Meanwhile, the upper substrate 20, the common electrode 22, and the electrophoretic film 30 may be integrally formed.

Here, the microcapsule 32 includes positively charged negatively charged particles and negatively charged negatively charged particles, and a solvent for surrounding the charged particles.

When an electric field is formed between the pixel electrode of the lower substrate 10 and the common electrode 22 of the upper substrate 20, the charged particles contained in the microcapsule 32 are moved by electrophoresis to realize an image do.

The electrophoretic film 30 is stored and transported in a state that a release film (not shown) is attached to the protective layer 34, and the release film is removed immediately before the laminating process is performed on the lower substrate 10, The protective layer 34 is attached to the lower substrate 10.

The electrophoretic display device according to the related art has a structure in which the upper substrate 20, the lower substrate 10 and the lamination electrophoretic film 30 are manufactured and then the electrophoretic film 30 is bonded to the lower substrate 10 And the upper substrate 20, as shown in Fig.

Therefore, since the lower substrate 10, the upper substrate 20, and the electrophoretic film 30 must be separately manufactured, the manufacturing process is complicated, and the manufacturing time is long, which results in a low manufacturing efficiency. In addition, since the separately prepared electrophoretic film 30 must be applied, the manufacturing cost increases.

In order to solve these problems, there has been proposed a technique of internalizing the electrophoresis layer on the lower substrate. However, since the manufacturing process technology for internalizing the electrophoresis layer on the lower substrate is not matured, .

Particularly, in the manufacturing process, the solvent is volatilized due to the filling time of the electrophoretic dispersion composed of the charged particles and the solvent, and the waiting time of the process for attaching the upper substrate and the lower substrate, so that the charged particles can not be normally driven.

When the electrophoretic display device displays a full color image, there is a problem that charged particles colored with a specific color are overflowed to neighboring pixels of different colors and a color image can not be displayed.

When electrophoretic dispersion is filled in the cells in order to realize full color, the electrophoretic dispersion filled in the early stage and the electrophoretic dispersion filled in the late stage are different in degree of volatilization, There is a problem that occurs.

As a result, each pixel is not normally driven, and when the electrophoretic dispersion liquid is volatilized to a large extent, there arises a serious problem that the pixel can not be driven. [0007] The above-described problems cause problems that the display quality of the electrophoretic display device is degraded, and manufacturing efficiency and driving reliability are lowered.

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing an electrophoretic display device that can improve the manufacturing efficiency of an electrophoretic display device.

SUMMARY OF THE INVENTION The present invention provides a method of manufacturing an electrophoretic display device capable of improving mass productivity and driving reliability.

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing an electrophoretic display device having high display quality.

SUMMARY OF THE INVENTION The present invention provides a method of manufacturing an electrophoretic display capable of realizing high quality images in various colors.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing an electrophoretic display device capable of improving the problem caused by volatilization of an electrophoretic dispersion liquid during a manufacturing process of internalizing an electrophoretic dispersion liquid on a lower substrate. .

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

According to another aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device including forming a plurality of pixel regions on a lower substrate and pixel electrodes corresponding to the plurality of pixel regions, Firstly filling an electrophoretic dispersion liquid composed of a charged particle and a first solvent colored in a specific color in a plurality of pixel regions defined by the partition wall; Performing a drying process to volatilize the first solvent filled in the plurality of pixel regions; Secondly filling the plurality of pixel regions with a second solvent so that the charged particles behave by electrophoresis; Sealing the top of the septum and the electrophoretic dispersion; And bonding the upper substrate and the lower substrate to each other.

According to an embodiment of the present invention, there is provided a method of manufacturing an electrophoretic display device, wherein the first-order filling of the electrophoretic dispersion is performed for each of red pixels, green pixels, and blue pixels.

According to another aspect of the present invention, there is provided a method of fabricating an electrophoretic display device, comprising: a first step of filling the electrophoretic dispersion with a first solvent, 30%, the volume ratio of the charged particles is 70 to 90%, and the first solvent has a viscosity of 100 cP to 100 kP.

According to another aspect of the present invention, there is provided a method of fabricating an electrophoretic display device, comprising: a first step of filling an electrophoretic dispersion liquid with a red pixel, a green pixel and a blue pixel, A screen printing method using a mask for opening the screen is performed and a squeegee speed of 5 to 50 [mm / sec] and a squeegee pressure of 0.1 to 30 [kgf] are performed.

According to another aspect of the present invention, there is provided a method of fabricating an electrophoretic display device, the method comprising: firstly filling the electrophoretic dispersion liquid; and volatilizing the first solvent, Filling the red pixels with an electrophoretic dispersion containing charged particles colored red in color, and then partially or completely volatilizing the first solvent; Filling an electrophoretic dispersion liquid containing charged particles colored green in the plurality of pixel regions of the plurality of pixel regions, and then partially or totally volatilizing the first solvent; And filling the electrophoretic dispersion liquid containing charged particles colored in blue color into blue pixels of the plurality of pixel regions, and then partially or totally volatilizing the first solvent.

According to another aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, comprising: completely evaporating a first solvent before filling the second solvent;

The manufacturing method of the electrophoretic display device according to the embodiment of the present invention can shorten the time required for the filling process of the electrophoretic dispersion and prevent the problems caused by the volatilization of the electrophoretic dispersion.

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

The manufacturing method of the electrophoretic display device according to the embodiment of the present invention can improve the mass productivity of the electrophoretic display device.

The manufacturing method of the electrophoretic display device according to the embodiment of the present invention can improve the filling reliability of the electrophoretic dispersion to secure the driving reliability of the electrophoretic display device.

The method of manufacturing an electrophoretic display device according to an embodiment of the present invention can prevent the unfilled and overfilled electrophoretic dispersion to improve the display quality of the electrophoretic display device.

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

The present invention according to the embodiments can provide a method of manufacturing electrophoresis capable of realizing a color image with high display quality.

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 a structure of an electrophoretic display device according to the related art.
2 is a plan view of an electrophoretic display device manufactured by the method of manufacturing the electrophoretic display device of the present invention.
3 to 12 are views showing a manufacturing method of an electrophoretic display device according to an 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 an embodiment of the present invention, it is to be understood that any structure may be referred to as being & And " below < / RTI > or below ", such substrate should be construed to include the case where these structures are in contact with each other, as well as to the extent that there is a third structure between these structures.

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

The technical idea of the present invention can be applied to all types of electrophoretic display devices, regardless of whether they are mono or color implementations. Hereinafter, a color type electrophoretic display device will be described as an example.

2 is a plan view of the electrophoretic display device manufactured by the method of manufacturing the electrophoretic display device of the present invention.

2, the present invention can be applied not only to a mono-type electrophoretic display device but also to an electrophoretic display device in which charged particles of an electrophoretic dispersion (electrophoretic ink) are colored in red, blue, Thereby displaying a full-color image.

The technical idea of the present invention is equally applicable to a method of manufacturing an electrophoretic display device further comprising charged particles colored in yellow, cyan, magenta, black or white .

Since the process of forming the electrophoretic layer on the lower substrate is important, the method of manufacturing the electrophoretic display according to the embodiment of the present invention will not be described in detail.

The upper substrate includes a base substrate and a common electrode formed on the base substrate.

Here, since the upper substrate must be transparent for displaying an image, the base substrate of the upper substrate is formed of transparent glass or transparent plastic.

The common electrode is formed by applying a conductive transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the base substrate.

3 to 12 are views showing a method of manufacturing an electrophoretic display device according to an embodiment of the present invention. FIGS. 3 to 12 sequentially show the manufacturing method of the electrophoretic display device on the basis of the cross section taken along the line A1-A2 shown in FIG. Hereinafter, a method of manufacturing an electrophoretic display device according to an embodiment of the present invention will be described with reference to FIGS. 2 to 12. FIG.

Referring to FIG. 3, a conductive layer such as copper, aluminum, or ITO is coated on the base substrate 110 to form a conductive layer.

Thereafter, the conductive layer is patterned through a photolithography process using a photoresist (photo-acryl) and an etching process to form the pixel electrodes 120 in each of the plurality of pixel regions.

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

At this time, the base substrate 110 or the base film may be a transparent glass substrate, a plastic substrate having flexibility, or a metal substrate. Since the lower substrate 100 of the electrophoretic display device is located on the opposite side of the screen on which an image is displayed, the base substrate 110 is not necessarily transparent.

Although not shown in FIGS. 2 and 3, a gate line and a data line are formed on the base substrate 110, and the thin film transistor (TFT) is formed in a region where the gate line and the data line intersect.

The gate line and the data line may be formed of a single film made of silver (Ag), aluminum (Al), or an alloy thereof having low resistivity, or may be formed of chromium Cr), titanium (Ti), or tantalum (Ta).

The gate of the thin film transistor is connected to the gate line, the source electrode is connected to the data line, and the drain is electrically connected to the pixel electrode 120 through the contact hole. Thus, the on-off of each pixel is switched through the thin film transistor, and the data voltage applied to the data line is supplied to the pixel electrode 120. [

Subsequently, an organic material is coated on the base substrate 110 on which the pixel electrode 120 is formed, and then patterned to form the barrier ribs 130 to surround the pixel electrodes 120 formed in the plurality of pixel regions.

And a pixel region (filled cell) filled with the electrophoretic dispersion liquid through the partition 130 is defined. At this time, as shown in FIG. 4, the barrier ribs may have a height of 10 um to 100 um and a width of 5 um to 30 um.

Here, the barrier ribs 130 may be formed using imprinting or mold printing as well as the photolithography method described above.

The barrier rib 130 is in contact with the electrophoretic dispersion filled in the pixel region through a subsequent manufacturing process. Accordingly, the barrier ribs 130 are formed of a non-polar organic material to match the physical properties of the electrophoretic dispersion so that filling of the electrophoretic dispersion liquid can be smoothly performed. Meanwhile, as another embodiment of the present invention, the partition 130 may be formed of a non-polar inorganic material.

After the barrier ribs 130 are formed, charged particles 140 charged with positive (+) or negative (-) polarity are applied to all pixel regions (filling cells) defined by the barrier ribs 130, (170).

Here, when the electrophoretic display device implements full color, the charged particles 140 are colored in colors corresponding to colors to be displayed by the respective cells. Therefore, the primary filling process of the electrophoretic dispersion composed of the charged particles 140 and the first solvent 170 can be sequentially performed for each color of the colored charged particles 140.

For example, when a plurality of pixels are composed of three colors of red, green, and blue, the colors corresponding to the colors of red, green, The filling of the electrophoretic dispersion can be sequentially performed for each pixel.

Referring to FIG. 5, a first mask 310 for opening only red pixels among all the pixels is aligned on the barrier ribs 130. Thereafter, an electrophoretic dispersion composed of red charged particles and a first solvent is filled in red pixels by a screen printing method using a squeegee bar (300, squeeze bar).

Next, referring to FIG. 6, a second mask 320, which opens only green pixels among all the pixels, is aligned on the barrier ribs 130. Then, an electrophoretic dispersion composed of green charged particles and a first solvent is filled in green pixels by a screen printing method using a squeeze bar (300).

Referring to FIG. 7, a third mask 330 for opening only blue pixels among all the pixels is aligned on the barrier ribs 130. Thereafter, the electrophoretic dispersion composed of the blue charged particles and the first solvent is filled in the green pixels by a screen printing method using a squeeze bar (300).

Here, the first to third masks 310 to 330 may be formed of the same material as the nickel or the barrier ribs 130, and as another example, a mesh mask may be used.

In this case, the volume ratio of the first solvent 170 to the first solvent 170 is 10 to 30%, the volume ratio of the charged particles 140 is 70 to 90%, and the first solvent 170 has a viscosity of 100 cP to 100 kP . The primary filling process of the electrophoretic dispersion can be performed with a squeegee speed of 5 to 50 [mm / sec] and a squeegee pressure of 0.1 to 30 [kgf].

In the prior art, there is a restriction in filling the electrophoretic dispersion under atmospheric pressure conditions because of the rapid evaporation rate of the solvent. However, in the present invention, the electrophoretic dispersion liquid having a high viscosity of 100 cP to 100 kcP is used, 140 can be filled.

As described above, the electrophoretic dispersion liquid containing the charged particles 140 and the first solvent 170 is sequentially charged in advance to the red pixel, the green pixel, and the blue pixel.

In FIG. 5 to FIG. 7, the red, green, and blue pixels are filled with the charged particles colored with black color together with the red charged particles, the green charged particles, and the blue charged particles. However, May be filled with the charged particles.

In addition, the electrophoretic dispersion primary filling process can be performed by a die coating method, a casting method, a bar coating method, a slit coating method, a dispensing method, , A squeezing method, a method, and an inkjet printing method may be used.

Here, the first solvent 170 of the electrophoretic dispersion may be any one selected from the group consisting of halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers ), Epoxides, vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, liquid paraffinic liquids, polychlorotrifluoro Polychlorotrifluoroethylene polymers materials may be used. The first solvent 170 may be a non-polar organic material.

At this time, the first solvent 170 is used only to fill the charged cells of the color pixels with the charged particles 140 colored with red, green, and blue, and a material suitable for the filling method described above can be applied .

As an example, solvents may be used when the electrophoretic dispersion is filled in the filling cell by using the ink jet method, and a material free from dissolution and precipitation is used in consideration of the reactivity of the charged particles according to each filling method . Further, in the subsequent process, a material having high volatility may be used as the first solvent so as to facilitate the volatilization time and the complete volatilization of the first solvent 170.

In the above description, the charged particles 140 are colored in red, green, and blue colors in the first filling step. However, the charged particles 140 may be colored in mono (black / white) and yellow ), Cyan (cyan), and magenta (magenta).

Referring to FIG. 8, after the charged particles are filled in the red pixels, the green pixels, and the blue pixels, a drying process is performed to completely volatilize the first solvent 170.

Here, some or all of the first solvent 170 can be volatilized during the first filling process of the electrophoretic dispersion liquid.

Specifically, as shown in FIG. 5, after filling the red pixels with the electrophoretic dispersion containing the red electrified particles, a part or all of the first solvent 170 filled with the red electrified particles is volatilized The charging process of the green charged particles can be performed.

6, after the green pixels are filled with the electrophoretic dispersion containing the green charged particles, a part or all of the first solvent 170 filled with the green charged particles is volatilized and then blue The charging process of charged particles can be performed.

When the first solvent 170 is partially dried, the red pixel and the first solvent filled in the green pixel can be volatilized for 10 minutes to 30 minutes.

When the first solvent 170 is completely volatilized, the drying process is performed for 1 minute to 24 hours so that the first solvent 170 filled in the entire pixel region is completely volatilized. For example, when the volume of the pixel region (filled cell) is 1.35 × 10 ^-4 cc, the drying process of the first solvent 170 is performed within 20 minutes. In order to increase the efficiency of the drying process, a temperature of 150 ° C or lower is applied to increase the volatilization rate of the first solvent 170, thereby completely volatilizing the first solvent 170 in the entire pixel region.

However, this is an example of a drying process. When the volatility of the first solvent 170 is high and the volume of the pixel region is small, the time of the drying process can be further shortened.

On the other hand, if the volatility of the first solvent 170 is low and the volume of the pixel region is large, the time of the drying process may be extended. Accordingly, the duration of the drying process proceeds for a suitable period of time in which the first solvent 170 is completely volatilized in consideration of the volatility characteristics of the first solvent 170 and the volume of the pixel region.

9, after the first solvent 170 is completely volatilized, the second solvent 150 is simultaneously filled in the entire pixel region in the state that the charged particles 140 are filled in each pixel region.

Here, the second solvent 150 has a viscosity of 1 cP to 100 cP and is filled up to the upper end of the partition 130. The second solvent 150 having a viscosity of 1 cP to 100 cP is filled in the pixel region filled with the charged particles 140 so that the charged particles 140 can be driven by electrophoresis.

The second solvent 150 may be at least one selected from the group consisting of halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, but are not limited to, epoxides, vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids, polychlorotrifluoroethylene polymers ( poly chlorotrifluoroethylene polymers) materials can be used. The second solvent 150 may be a non-polar organic material.

The second solvent 150 may be formed by a die coating method, a casting method, a bar coating method, a slit coating method, a dispense method, a squeezing method, , A screen printing method, and an inkjet printing method.

In this case, the second solvent 150 is not necessarily the same as the first solvent 170, and the material may be different depending on the method of filling the first solvent 170 and the second solvent 150 have.

Referring to FIG. 10, a sealant layer 160 is formed by applying a sealant on the partition 130 and the electrophoretic dispersion. Through this sealing layer 160, the partition 130 and the electrophoretic dispersion are sealed.

At this time, the sealing layer 160 has a function of not only sealing the electrophoretic dispersion but also bonding the upper substrate 200 and the lower substrate 100 together.

Here, the sealing layer 160 may be formed by imprinting or photolithography after applying an adhesive material on the barrier ribs 130 and the pixel region filled with the electrophoretic dispersion liquid. have. As another example, the sealing layer 160 may be formed using a roll-to-roll process using rollers formed with embossed or embossed patterns.

Then, as shown in FIG. 11, a common electrode 220 is formed on the base substrate 210 to manufacture an upper substrate 200. At this time, the upper substrate 200 is manufactured separately from the manufacturing process of the lower substrate 100, and may be prepared in advance through a preceding manufacturing process. Then, the lower substrate 100 and the upper substrate 200 are bonded together.

The joining of the upper substrate 200 and the lower substrate 100 may be performed through a pressurizing process to apply a predetermined pressure and an annealing process to apply a constant temperature together with the pressing process.

Meanwhile, the sealing layer 160 may be formed in a film type, and then the upper substrate 100 and the lower substrate 200 may be bonded together using a lamination process.

The lower substrate 100 and the upper substrate 200 are bonded together by using the sealing layer 160 so that the shielding of the display region can be completely performed. Therefore, it is possible to prevent defects in the electrophoretic display device from being contaminated by external air and moisture, and to improve the mass productivity and reliability of the electrophoretic display device.

As shown in FIG. 12, the electrophoretic display device in which the electrophoretic dispersion is internalized in the lower substrate 100 can be manufactured by performing the above-described manufacturing process. The electrophoretic display device manufactured by the present invention is characterized in that an electrophoretic dispersion liquid filled in a pixel region by an electric field formed by a data voltage applied to a plurality of pixel electrodes 120 and a common voltage applied to the common electrode 220 The particles 140 may move within the second solvent 150 to implement a mono image and a color image.

Although the sealing layer 160 is formed on the lower substrate 100 in the above description, the sealing layer 160 may be formed on the upper substrate 200. In an alternative embodiment of the present invention, .

That is, after the sealing layer 160 is formed on the upper substrate 200, the electrophoretic dispersion internalized in the lower substrate 100 may be sealed by attaching the upper substrate 200 and the lower substrate 100 together.

When the sealing layer 160 is formed on the upper substrate 200, an adhesive material is applied on the common electrode 220, and then an imprinting process, a photolithography process, or a roll-to- The sealing layer 160 may be formed by using a -Roll process.

In the manufacturing method of the electrophoretic display device according to the embodiment of the present invention, it is possible to prevent the unfilled electrophoretic dispersion in the manufacturing process of internalizing the electrophoretic layer on the lower substrate to improve the display quality of the electrophoretic display device, Driving reliability can be ensured. In addition, it is possible to prevent defects due to uncharged electrophoretic dispersion, thereby improving the mass productivity and manufacturing efficiency of the electrophoretic display device.

In addition, the filling process of the electrophoretic dispersion liquid can be smoothly performed by matching the outer walls surrounding the electrophoretic dispersion liquid, that is, the partition walls and the electrophoretic dispersion liquid.

The manufacturing method of the electrophoretic display device according to the embodiments of the present invention has an advantage of being able to apply the manufacturing infra used in the manufacturing process of the conventional liquid crystal display device.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

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: base substrate
120: pixel electrode 130: barrier rib
140: charged particle 150: second solvent
160: sealing layer 170: first solvent
200: upper substrate 210: base substrate
220: common electrode 300: squeegee bar
310, 320, 330: mask

Claims (14)

Forming barrier ribs defining a plurality of pixel regions on the lower substrate and pixel electrodes corresponding to the plurality of pixel regions;
Firstly filling an electrophoretic dispersion composed of charged particles colored with one of red, green, and blue colors and a first solvent in a plurality of pixel regions defined by the partition walls;
Performing a drying process to volatilize the first solvent filled in the plurality of pixel regions;
Repeating the steps of filling the electrophoretic dispersion liquid first and volatilizing the first solvent for each of the remaining two colors of the red, green, and blue colors;
Secondly filling the plurality of pixel regions with a second solvent so that the charged particles behave by electrophoresis;
Sealing the top of the septum and the electrophoretic dispersion; And
And bonding the upper substrate and the lower substrate to each other. The method according to claim 1,
Wherein the first filling of the electrophoretic dispersion is performed for each of a red pixel, a green pixel and a blue pixel. The method according to claim 1,
In the first filling of the electrophoretic dispersion,
Wherein the volume ratio of the first solvent to the electrophoretic dispersion is 10 to 30%, the volume ratio of the charged particles is 70 to 90%, and the first solvent has a viscosity of 100 cP to 100 kcP. Way. The method according to claim 1,
The first filling process of the electrophoretic dispersion liquid may be performed by using a screen printing method using a mask that selectively opens the red pixel, the green pixel and the blue pixel among the plurality of pixel regions and a squeegee speed of 5 to 50 [mm / sec] And a squeegee pressure of 0.1 to 30 [kgf]. The method according to claim 1,
The step of filling the electrophoretic dispersion liquid first and the step of volatilizing the first solvent,
Filling a red pixel of the plurality of pixel regions with an electrophoretic dispersion liquid containing charged particles colored in red color, and then partially or completely volatilizing the first solvent;
Filling an electrophoretic dispersion liquid containing charged particles colored green in the plurality of pixel regions of the plurality of pixel regions, and then partially or totally volatilizing the first solvent; And
And filling the electrophoretic dispersion liquid containing charged particles colored in blue color into blue pixels of the plurality of pixel regions and then partially or wholly volatilizing the first solvent . The method according to claim 1,
And the first solvent is completely volatilized before the filling of the second solvent. The method according to claim 6,
And a temperature of 150 DEG C or lower is applied to completely volatilize the first solvent. The method according to claim 1,
Wherein the drying step for volatilizing the first solvent is performed for 1 minute to 24 hours. The method according to claim 1,
The first solvent is completely volatilized, and then the second solvent is simultaneously filled in the plurality of pixel regions. The method according to claim 1,
And the second solvent has a viscosity of 1 cP to 100 cP. The method according to claim 1,
A die coating method, a casting method, a bar coating method, a slit coating method, a dispensing method, a squeezing method, a screen printing method, , And ink jet printing (inkjet printing). The method of manufacturing an electrophoretic display device according to claim 1, wherein the first filling step and the second filling step are performed in one of the ink jet printing method and the ink jet printing method. The method according to claim 1,
The first and second solvents may be halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides, epoxides, vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids, poly (chlorotrifluoroethylene) polymers chlorotrifluoroethylene polymers) material. < Desc / Clms Page number 24 > The method according to claim 1,
Wherein the first solvent and the second solvent are nonpolar organic substances. The method according to claim 1,
The charged particles are selectively colored in colors of red, blue, green, yellow, cyan, magenta, black, and white. , And a manufacturing method of the electrophoretic display device.

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