KR20130129672A - Electrophoretic display device and method for manufacturing the same - Google Patents

Abstract

The present invention relates to an electrophoretic display device having improved display quality and a method of manufacturing an electrophoretic display device capable of improving manufacturing efficiency.
An electrophoretic display according to an exemplary embodiment of the present invention includes an upper substrate on which a common electrode is formed; A lower substrate having pixel electrodes formed in each pixel area; A spacer formed between the upper substrate and the lower substrate to form a cell gap; It includes a charged particle and a solvent colored in a specific color filled in the pixel region formed by the sal gap.

Description

Electrophoretic display and its manufacturing method {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 having improved display quality and a method of manufacturing an electrophoretic display device capable of improving manufacturing efficiency.

The electrophoretic display device refers to a device for displaying an image by using an electrophoresis phenomenon in which colored charged particles move by an electric field applied from the outside. Here, the electrophoretic phenomenon refers to a phenomenon in which the charged particles move in the solvent 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 solvent.

The electrophoretic display using the electrophoretic phenomenon has a feature of bistability, so that the original image can be displayed for a long time even if 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 may not only have a dependency on a viewing angle, but may also provide a comfortable image to the eye to a degree similar to paper. In addition, there are advantages such as flexibility, low power consumption, and eco-friendly 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 a lower substrate 10, an upper substrate 20, and an electrophoretic film 30. The electrophoretic film 30 is interposed between the lower substrate 10 and the upper substrate 20.

The lower substrate 10 has 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 plurality of gate lines and the plurality of data lines. A thin film transistor (TFT, not shown) and a pixel electrode (not shown) are formed in the plurality of pixels formed on the lower substrate 10.

The thin film transistor is switched according to the scan signal applied through the gate line. By switching the thin film transistor, the data voltage supplied through the data line is supplied to the pixel electrode.

The upper substrate 20 includes a common electrode 22 facing the pixel electrode.

The electrophoretic film 30 includes a plurality of microcapsules 32 and an adhesive layer 34.

The plurality of microcapsules 32 is composed of a plurality of charged particles and a solvent.

Some of the charged particles are positively charged in part and the other negatively charged. The adhesive layer 34 protects the microcapsules 32 and adheres the electrophoretic film 30 to the lower substrate 10.

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 .

The electrophoretic display device according to the related art manufactures the lower substrate 10, the upper substrate 20, and the electrophoretic film 30, respectively. The electrophoretic film 30 is stored and transported while attached to the upper substrate 20. Thereafter, the release film (not shown) attached to the lower portion of the electrophoretic film 30 is removed, and the electrophoretic film 30 is attached to the lower substrate 10 by a lamination process.

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.

On the other hand, an internalization type electrophoretic display device in which an electrophoretic dispersion is embedded in a lower substrate has been developed in place of the electrophoretic film 30, but the display quality is deteriorated due to the incomplete development of the device structure and manufacturing process. There is a problem that contamination and color mixing occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an electrophoretic display device having improved 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 an object of the present invention is to improve 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 having improved driving reliability 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 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.

Disclosure of 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 preventing unfilled and overfilled electrophoretic dispersions.

The present invention is to solve the above-described problems, it is possible to prevent the electrophoretic dispersion overflows to the upper part of the partition wall during the manufacturing process for internalizing the electrophoretic dispersion in the lower substrate.

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 an electrophoretic display device and a method of manufacturing the same, which can prevent color mixing of charged particles internalized 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.

Electrophoretic display device according to an embodiment of the present invention for achieving the above object is an upper substrate formed with a common electrode; A lower substrate having pixel electrodes formed in each pixel area; A spacer formed between the upper substrate and the lower substrate to form a cell gap; And a charged particle and a solvent colored in a specific color filled in the pixel region formed by the sal gap.

According to an aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, including forming a plurality of pixel electrodes in each of a plurality of pixel regions defined in a lower substrate; Forming a spacer having a predetermined height between the plurality of pixel electrodes; Filling charged pixel colored in a specific color into a pixel region between the bonded upper substrate and the lower substrate; Bonding the upper substrate and the lower substrate on which the common electrode is formed; Filling a driving solvent into the pixel region filled with the charged particles; And sealing the pixel region in which filling of the charged particles and the driving solvent is completed.

According to an aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, including forming a plurality of pixel electrodes in each of a plurality of pixel regions defined in a lower substrate; Forming a spacer having a predetermined height between the plurality of pixel electrodes; Bonding the upper substrate and the lower substrate on which the common electrode is formed; Filling the pixel region between the bonded upper substrate and the lower substrate with charged particles and driving solvent colored in a specific color; And sealing the pixel region in which filling of the charged particles and the driving solvent is completed.

An electrophoretic display device according to an exemplary embodiment of the present invention may improve display quality.

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

According to an embodiment of the present invention, an electrophoretic display device having improved driving reliability 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 implement a high quality image in a variety of colors.

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

The present invention according to the embodiment can prevent the electrophoretic dispersion from overflowing to the upper part of the partition wall during the manufacturing process to internalize the electrophoretic dispersion to 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 prevent color mixing of the charged particles internalized 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 and 3 illustrate an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a black and white image.
4 and 5 illustrate an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying color images.
6 to 12 illustrate a method of manufacturing an electrophoretic display device according to a first embodiment of the present invention.
13 to 19 illustrate a method of manufacturing an electrophoretic display device according to a second exemplary embodiment of the present invention.
20 to 24 illustrate a method of manufacturing an electrophoretic display device according to a third exemplary embodiment of the present invention.
25 to 33 illustrate a method of manufacturing an electrophoretic display device according to a fourth exemplary embodiment of the present invention.

Hereinafter, an electrophoretic display device and a method of manufacturing the same 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 including charged particles and a solvent is embedded in a lower substrate, and a method of manufacturing the same.

The technical idea of the present invention can be applied to all types of electrophoretic displays regardless of whether a monochrome image or a color image is displayed.

2 and 3 are diagrams illustrating an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a black and white image. 2 is a plan view of an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a black and white image, and FIG. 3 is a cross-sectional view taken along the line A1-A2 of FIG. 2.

2 and 3, an electrophoretic display device according to an exemplary embodiment of the present invention includes an electrophoretic layer that is internalized on the lower substrate 100, the upper substrate 200, and the lower substrate 100 to display an image. do.

The lower substrate 100 includes a lower base substrate 110, a first base substrate, a pixel electrode 120, and a spacer 130, for displaying an image by electrophoresis in a space provided by the spacer 130. The electrophoretic dispersion, ie display solvent, is filled.

Although not shown, the lower base substrate 110 is formed so that a plurality of gate lines (not shown) and a plurality of data lines (not shown) intersect. A plurality of pixels is defined by the intersection of the plurality of gate lines and the plurality of data lines, and a thin film transistor TFT is formed in each of the plurality of pixels.

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. On-off of each pixel is switched through the thin film transistor, and a data voltage applied to the data line is supplied to the pixel electrode 120.

The spacer 130 has a columnar shape having a height of 10 μm to 100 μm, and is formed in a dot pattern in the pixel area (active area). A cell gap is formed by the spacer 130 to provide a pixel area, that is, a filling space, in which an electrophoretic dispersion may be filled.

The spacer 130 is formed of a nonpolar organic material or a nonpolar inorganic material so as to match the physical properties of the electrophoretic dispersion, so that the filling of the electrophoretic dispersion may be smoothly performed during the manufacturing process.

The electrophoretic dispersion is filled in the filling space provided by the spacer 130 to form an electrophoretic layer for displaying an image. Here, the electrophoretic dispersion is composed of a plurality of charged particles 140 and the driving solvent 150.

Some of the charged particles 140 are charged with a positive (+) polarity, and others are charged with a negative (-) polarity.

When the electrophoretic display displays a black and white image, as shown in FIGS. 2 and 3, the plurality of charged particles 140 are colored in a black color and a white color.

In this case, the charged particles of black color may be formed of a carbon black material, and the charged particles of white color may be formed of titanium dioxide (TiO ₂ ).

The driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 140 may be moved by electrophoresis.

As an example, the driving solvent 150 may include halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides, and the like. (epoxides), vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids or polychlorotrifluoroethylene polymers ( poly chlorotrifluoroethylene polymers) materials may be used.

The upper substrate 200 includes an upper base substrate 210, a second base substrate, a common electrode 220, and a sealing layer 230.

Since the upper substrate 200 should be transparent in order to display an image, the upper base substrate 210 may be formed of a glass of transparent material or a material of transparent plastic.

The common electrode 220 is formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

The sealing layer 230 is formed of a transparent sealant on the common electrode 230, and seals the electrophoretic dispersion embedded in the lower substrate 100 through the sealing layer 230. At this time, the sealing layer 230 has a function of bonding the lower substrate 100 and the upper substrate 200 as well as the use of sealing the electrophoretic dispersion.

The charged particles 140 of the electrophoretic dispersion filled in the pixel region are formed in the driving solvent 150 by an electric field formed by a data voltage applied to the plurality of pixel electrodes 120 and a common voltage applied to the common electrode 220. You can move from to display black and white images.

In an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a black and white image having the above-described configuration, spacers 130 are formed in a dot pattern in a pixel area so that an electrophoretic dispersion is filled in the lower substrate 100. To form a cell gap. Since the spacer 130 is formed in a dot pattern, the aperture ratio is high, and thus the display quality may be improved by increasing the brightness and contrast ratio of the image.

4 and 5 are diagrams illustrating an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying color images. 4 is a plan view of an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying color images, and FIG. 5 is a cross-sectional view taken along line B1-B2 of FIG. 4.

In describing an electrophoretic display device according to an exemplary embodiment of the present disclosure capable of displaying a color image, a detailed description of the same configuration as an electrophoretic display apparatus according to an exemplary embodiment of the present disclosure capable of displaying a black and white image described above Is omitted.

4 and 5, an electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a color image may include electrophoresis embedded in the lower substrate 100, the upper substrate 200, and the lower substrate 100. Dispersions.

The lower substrate 100 includes a lower base substrate 110, a pixel electrode 120, and a spacer 160.

The spacer 160 is formed as a stripe wall extending in one direction (lengthwise in the figure). In this case, the spacer 160 is formed to have a height of 10 μm to 100 μm to form a cell gap between the lower substrate 100 and the upper substrate 200.

In the space provided by the spacer 160, an electrophoretic dispersion, ie, a display solvent, for displaying an image by electrophoresis is filled.

The red, green, and blue pixels according to the color to be displayed by each pixel are distinguished by the spacer 160, and the red, green, and blue pixels are colored in the color corresponding to the driving solvent 150 and the pixel. A plurality of charged particles 170 is filled. At this time, the electrophoretic dispersion is composed of charged particles 170 and the driving solvent 150.

The spacer 160 is formed of a non-polar organic material or a non-polar inorganic material to match the properties of the electrophoretic dispersion, so that the filling of the electrophoretic dispersion can be smoothly made during the manufacturing process.

Some of the charged particles 170 are charged with a positive (+) polarity, and others are charged with a negative (-) polarity.

The driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 170 may be moved by electrophoresis, and the same material as the above-described embodiment may be applied. Can be.

When the electrophoretic display displays a color image, the charged particles 170 are colored in a color corresponding to the color to be displayed by each pixel. In this case, the plurality of charged particles 170 may be colored in red, green, blue, and black colors. Although not shown in the drawings, the charged particles may be colored in a color of yellow, cyan, magenta, or white.

A color image may be displayed by configuring one unit pixel with three pixels capable of displaying a red color, a green color, and a blue color.

The red pixels for displaying the red color are filled with red colored charged particles. Green color charged particles are filled in the green pixels for displaying the green color. The blue pixels for displaying the blue color are filled with blue colored charged particles. In addition, the red pixels, the green pixels, and the blue pixels are filled with charged particles of black color.

The upper substrate 200 includes an upper base substrate 210, a common electrode 220, and a sealing layer 230.

The common electrode 220 is formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

The sealing layer 230 is formed of a transparent sealant on the common electrode 230, and seals the electrophoretic dispersion embedded in the lower substrate 100 through the sealing layer 230.

In the electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a color image having the above-described configuration, the spacer 160 may be disposed in one direction so that the electrophoretic dispersion is filled in the lower substrate 100. In the drawing, a stripe wall is formed in which the length in the vertical direction is extended. The red pixel, the green pixel, and the blue pixel are distinguished through the spacer 160 to form a cell gap.

The charged particles 170 of the electrophoretic dispersion filled in the pixel region are formed in the driving solvent 150 by an electric field formed by a data voltage applied to the plurality of pixel electrodes 120 and a common voltage applied to the common electrode 220. You can move from to display the color image.

In the electrophoretic display device according to an exemplary embodiment of the present invention capable of displaying a color image, the spacer 160 is formed as a stripe partition wall in which the length of the spacer 160 extends in one direction (vertical direction in the drawing). Such spacers 160 may prevent the red, green, and blue pixels from overcharging the charged particles with pixels of other neighboring colors.

In addition, the lower substrate 100 and the upper substrate 200 may be bonded together using the sealing layer 230 to completely shield the display area. 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.

6 to 12 are views illustrating a method of manufacturing an electrophoretic display device according to a first embodiment of the present invention. Hereinafter, a method of manufacturing an electrophoretic display device according to a first embodiment of the present invention will be described with reference to FIGS. 6 to 12.

Referring to FIG. 6, a conductive layer such as copper (Cu), aluminum (Al: aluminum), indium tin oxide (ITO), or indium zinc oxide (IZO) is coated on the lower base substrate 110 to form a conductive layer. To form. Thereafter, a photoresist (PR) is coated on the conductive layer, and a photolithography process and an etching process using the photoresist as a mask are performed to pattern the conductive layer.

The conductive layer is patterned to form a plurality of pixel electrodes 120 of copper, aluminum, ITO, or IZO material in each of the plurality of pixel regions. Meanwhile, the pixel electrode 120 may be formed by further stacking nickel (Ni), gold (Au), or the like on the above-described materials of copper, aluminum, ITO, or IZO.

The lower base substrate 110 may be a glass substrate made of a transparent material, a plastic substrate having a 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 the image is displayed, the lower base substrate 110 is not necessarily transparent.

Although not shown in FIG. 6, a plurality of gate lines and a plurality of data lines are formed on the lower base substrate 110 to define a plurality of pixels. The gate line and the data line may be formed of a single layer made of silver (Ag), aluminum (Al), or alloy (Alloy) having a low resistivity.

The gate line and the data line may be formed of a multilayer film further including a film made of chromium (Cr), titanium (Ti), or tantalum (Ta) having excellent electrical characteristics.

The gate of the thin film transistor is connected to the gate line, the source is connected to the data line, and the drain is electrically connected to the pixel electrode 120. The on-off of the pixel is switched through the thin film transistor. When a scan pulse is applied to the gate of the thin film transistor through the gate line, the thin film transistor is turned on and a data voltage applied to the data line is supplied to the pixel electrode 120.

Subsequently, referring to FIG. 7, an organic material is coated on the lower base substrate 110 on which the pixel electrode 120 is formed, and then patterned to form a plurality of spacers 130 in the pixel region. In order to prevent the aperture ratio of the pixel from being lowered, the plurality of spacers 130 may be formed between the pixel electrodes 120.

The spacer 130 has a columnar shape having a height of 10 μm to 100 μm, and is formed in a dot pattern where the pixel electrode 120 is not formed in the pixel area. A cell gap is formed between the lower substrate 100 and the upper substrate 200 by the spacer 130 to provide a filling space in which the electrophoretic dispersion may be filled.

Here, the spacer 130 may be formed using not only the above-described photolithography method but also an imprinting or mold printing method.

The spacer 130 is formed of a nonpolar organic material to match the physical properties of the electrophoretic dispersion. Meanwhile, as another embodiment of the present invention, the spacer 130 may be formed of a nonpolar inorganic material.

Subsequently, referring to FIG. 8, the charged particles 140 and the filling solvent 155 are filled in the pixel region.

Specifically, as shown in FIG. 8A, the mask 300 having the opening 302 for opening each pixel is aligned on the spacer 130. In this case, the thickness of the mask 300 may be 20 μm to 40 μm, and the hole size of the opening 302 may be 30 μm to 60 μm.

The mask 300 may be a metal mask made of nickel, an organic mask made of the same material as the spacer 130, or an inorganic mask. Meanwhile, a mesh mask may be used.

Subsequently, as shown in FIG. 8 (B), the electrophoretic dispersion, that is, the display solvent, composed of the charged particles 140 and the filling solvent 155 (the first solvent) by the screen printing method using the squeegee bar 400 is entirely used. Fill the pixel. At this time, the filling of the charged particles 140 is made in a volume corresponding to 10% to 50% of the filling space.

The filling process of the electrophoretic dispersion composed of the charged particles 140 and the filling solvent (155, the first solvent) may be made of a squeegee speed of 5 ~ 50 [mm / sec] and 0.1 ~ 30 [Kgf / ㎠] squeegee pressure .

Here, the plurality of charged particles 140 are colored in a black color and a white color. The charged particles of black color may be formed of a carbon black material, and the charged particles of white color may be formed of titanium dioxide (TiO ₂ ).

On the other hand, the electrophoretic dispersion filling process is not only the screen printing method but also die coating method, casting method, bar coating method, slit coating method, dispensing method, A squeezing method, a method, or an inkjet printing method may also be used.

Subsequently, referring to FIG. 9, after charging the charged particles 140 and the filling solvent 155 (the first solvent) to all the pixels, the filling solvent 155 (the first solvent) is volatilized by performing a drying (volatile) process. Let's do it. At this time, some or all of the filling solvent 155 (the first solvent) may be volatilized.

When partially filling the filling solvent 155 (first solvent), the filling solvent 155 (first solvent) may be volatilized for a time of 10 minutes to 30 minutes.

In the case where the filling solvent 155 (the first solvent) is completely volatilized, a drying process is performed for 10 minutes to 24 hours.

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 filling solvent 155 (the first solvent). However, this is an example of a drying process, and when the filling solvent 155 (the first solvent) is high in volatility and the volume of the pixel region is small, the drying time may be further shortened.

On the other hand, when the filling solvent 155 (the first solvent) is low in volatility and the volume of the pixel region is large, the drying process may be further extended. Therefore, the drying process is performed for a proper time in consideration of the volatilization characteristics of the filling solvent 155 (first solvent) and the volume of the pixel region.

Next, referring to FIG. 10, the upper substrate 200 is manufactured by forming the common electrode 220 and the sealing layer 230 on the upper base substrate 210. 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.

Thereafter, the upper and electrophoretic dispersions of the spacer 130 are sealed using the sealing layer 230, and the lower substrate 100 and the upper substrate 200 are bonded to each other.

Since the upper substrate 200 should be transparent to display an image, the upper base substrate 210 (the second base substrate) may be formed of a glass of transparent material or a material of transparent plastic.

The common electrode 220 is formed of a transparent conductive material such as ITO on the upper base substrate 210, and is formed in a plate shape to correspond to the entire pixel area.

The sealing layer 230 may be formed by applying an adhesive material on the common electrode 220 and then performing an imprinting or photolithography process.

As another example, the sealing layer 230 may be formed using a roll-to-roll process using a roller in which a specific pattern is embossed or engraved.

Meanwhile, after the sealing layer 230 is manufactured in a film type, the upper substrate 100 and the lower substrate 200 may be bonded using a lamination process.

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

Subsequently, referring to FIG. 11, a container 500 containing a driving solvent 150 (second solvent) is prepared. Thereafter, the bonded lower substrate 100 and the upper substrate 200 are vertically erected and immersed in the driving solvent 150 contained in the container 500. In the following description, what the lower substrate 100 and the upper substrate 200 are bonded to is simply referred to as a 'panel'.

Subsequently, referring to FIG. 12, a driving solvent 150 (second solvent) for electrophoretic driving of the charged particles 140 is simultaneously filled in the entire pixel region.

Specifically, the cell gap is formed in the panel by the spacers 130. When the driving solvent 150 contacts, the driving solvent 150 is filled in the space of the entire pixel region by capillary action.

The driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 140 may be moved by electrophoresis.

As an example, the driving solvent 150 may include halogenated solvents, saturated hydrocarbons, silicone oils, low molecular weight halogen-containing polymers, epoxides, and the like. (epoxides), vinyl ethers, vinyl esters, aromatic hydrocarbons, toluene, naphthalene, paraffinic liquids or polychlorotrifluoroethylene polymers ( poly chlorotrifluoroethylene polymers) materials may be used.

Here, the same material may be applied to the filling solvent 155 (the first solvent) and the driving solvent 150 (the second solvent). However, the filling solvent 155 and the driving solvent 150 are not necessarily the same material, and the filling solvent 155 and the driving solvent 150 may be different materials depending on the method of filling each solvent.

Subsequently, when filling of the plurality of charged particles 140 and the driving solvent 150 is completed in the pixel area between the lower substrate 100 and the upper substrate 200, an outer edge of the lower substrate 100 and the upper substrate 200 is completed. The sealant is sealed with a sealant to prevent the plurality of charged particles 140 and the driving solvent 150 from flowing out.

In the method of manufacturing the electrophoretic display device according to the first embodiment of the present invention described above, after charging the charged particles 140 in the pixel region, the lower substrate 100 and the upper substrate 200 are bonded to each other. After the lower substrate 100 and the upper substrate 200 are bonded together, the driving solvent 150 is filled in the pixel region, thereby filling the charged particles 140 and the driving solvent 150 in a uniform amount in the entire pixel region. You can.

After the filling of the charged particles 140 and the driving solvent 150 is completed, the panel may be sealed with a sealant to prevent volatilization of the driving solvent 150. As such, volatilization of the driving solvent 150 may be suppressed to maintain uniform amounts of the charged particles 140 and the driving solvent 150 filled in all the pixels, thereby preventing a change in characteristics.

In addition, the charged particles 140 and the driving solvent 150 are filled in the state where the lower substrate 100 and the upper substrate 200 are bonded to each other so that the charged particles 140 and the driving solvent 150 become active areas. ) It can be prevented from overflowing to the outside.

On the other hand, the filling process of the driving solvent 150, in addition to the method using the capillary phenomenon described above, a screen printing method using a squeeze bar, a die coating method, a casting method, A bar coating method, a slit coating method, a dispensing method, a squeezing method, an inkjet printing method, or an inkjet printing method may be applied.

13 to 19 illustrate a method of manufacturing an electrophoretic display device according to a second exemplary embodiment of the present invention. Hereinafter, a method of manufacturing an electrophoretic display device according to a second exemplary embodiment of the present invention will be described with reference to FIGS. 13 to 19. In describing the method of manufacturing the electrophoretic display device according to the second embodiment of the present invention, detailed description of the same contents as those of the first embodiment will be omitted.

Referring to FIG. 13, a plurality of pixel electrodes 120 are formed on the base substrate 110. In this case, the pixel electrode 120 may be formed of an opaque metal of copper or aluminum, or may be formed of a conductive transparent material of ITO or IZO.

Subsequently, referring to FIG. 14, an organic material is coated on the lower base substrate 110 on which the pixel electrode 120 is formed, and then patterned to form a spacer 160 in the pixel region.

Here, a plurality of pixels are formed in the pixel area, and the plurality of pixels includes red pixels for displaying red color, green pixels for displaying green color, and blue pixels for displaying blue color.

The spacer 160 is formed as a stripe wall extending in one direction (lengthwise in the figure) to distinguish red pixels, green pixels, and blue pixels. In this case, the spacer 160 is formed to have a height of 10 μm to 100 μm to form a cell gap between the lower substrate 100 and the upper substrate 200.

Subsequently, referring to FIG. 15, the charged particles 170 and the filling solvent 155 (the first solvent) are filled. At this time, in order to display the color image, the charged particles 170 are colored in the color that the pixel is to display. Therefore, the charged particles 170 and the filling solvent 155 are filled in the pixel area by dividing the red pixels, the green pixels, and the blue pixels.

Specifically, as shown in FIG. 15A, the first mask 310 having the opening 312 opening only the red pixels among all the pixels is aligned on the spacer 160.

Thereafter, the electrophoretic dispersion composed of the red and black charged particles 170 and the filling solvent 155 (the first solvent) is filled in the entire red pixels by screen printing using the squeegee bar 400.

Subsequently, as shown in FIG. 15B, the second mask 320 having the opening 322 for opening only the green pixels among all the pixels is formed on the spacer 160.

Thereafter, the electrophoretic dispersion composed of the charging particles 170 and the filling solvent 155 of green color and black color is filled in the entire green pixels by the screen printing method using the squeegee bar 400.

Subsequently, as illustrated in FIG. 15C, the third mask 330 having the opening 332 opening only the blue pixels among all the pixels is aligned on the spacer 160.

Thereafter, the electrophoretic dispersion composed of the charging particles 170 and the filling solvent 155 of blue and black colors is filled in the entire green pixels by the screen printing method using the squeegee bar 400.

Here, the charging particles 170 are filled in a volume corresponding to 10% to 50% of the filling space of the red pixels, the green pixels, and the blue pixels.

The filling process of the electrophoretic dispersion consisting of the charged particles 170 and the filling solvent 155 may be made of a squeegee speed of 5 ~ 50 [mm / sec] and 0.1 ~ 30 [Kgf / ㎠] squeegee pressure.

Here, the thicknesses of the first mask 310 to the third mask 330 may be 20 μm to 40 μm, and the hole sizes of the openings 312, 322, and 332 may be 30 μm to 60 μm. have.

As the first mask 310 to the third mask 330, a metal mask made of nickel, an organic mask made of the same material as the spacer 160, or an inorganic mask may be used. Meanwhile, a mesh mask may be used.

In FIG. 15, charged particles of black color are filled in red pixels, green pixels, and blue pixels together with charged particles of red color, charged particles of green color, and charged particles of blue color. However, the present invention is not limited thereto, and a charged particle of another color, for example, a charged particle of a white color may be filled in place of the charged particle of a black color.

Meanwhile, in addition to the screen printing method described above, as a filling process of the charged particles 170 and the filling solvent 155, a die coating method, a casting method, a bar coating method, and a slit coating method may be used. A coating method, a dispensing method, a squeezing method, an inkjet printing method, or an inkjet printing method may be used.

Subsequently, referring to FIG. 16, the charging pixels 170 and the filling solvent 155 of each color are filled in the red pixels, the green pixels, and the blue pixels, and then the filling solvent 155 is performed by performing a drying process. Volatilize. At this time, some or all of the filling solvent 155 may be volatilized.

When the part of the filling solvent 155 is volatilized, the filling solvent 155 may be volatilized for a time of 10 minutes to 30 minutes. On the other hand, if the filling solvent 155 is completely volatilized, the drying process is performed for 10 minutes to 24 hours. 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 filling solvent 155.

On the other hand, when the volatility of the filling solvent 155 is low and the volume of the pixel region is large, the drying process may be further extended. Therefore, the drying process is performed for a proper time in consideration of the volatilization characteristics of the filling solvent 155 and the volume of the pixel region.

Next, referring to FIG. 17, the upper substrate 200 is manufactured by forming the common electrode 220 and the sealing layer 230 on the upper base substrate 210 (the second base substrate). 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.

Thereafter, the upper and electrophoretic dispersions of the spacer 160 are sealed using the sealing layer 230, and the lower substrate 100 and the upper substrate 200 are bonded to each other.

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.

The material and manufacturing method of the upper base substrate 210, the common electrode 220, and the sealing layer 230 illustrated in FIG. 17 are the same as the manufacturing method of the electrophoretic display device according to the first embodiment.

Next, referring to FIG. 18, a container 500 containing a driving solvent 150 (second solvent) is prepared. Thereafter, the panel is vertically immersed in the driving solvent 150 contained in the container 500.

Subsequently, referring to FIG. 19, a driving solvent 150 (second solvent) for electrophoretic driving of the charged particles 170 is filled in the entire pixel area. Since the charged particles 170 are already filled in the red pixel, the green pixel, and the blue pixel in the previous process, the driving solvent 150 may be simultaneously filled in the entire pixel region.

In detail, a cell gap is formed in the panel by the spacer 160. When the driving solvent 150 contacts, the driving solvent 150 is filled in the space of the entire pixel region by capillary action.

The driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 170 may be moved by electrophoresis. In this case, the same solvent as the driving solvent 150 may be used.

The driving solvent 150 is filled up to 80% to 100% of the filling space. As such, the driving solvent 150 is filled in the pixel region so that the charged particles 170 are driven by electrophoresis.

On the other hand, the filling process of the driving solvent 150, in addition to the method using the capillary phenomenon described above, a screen printing method using a squeeze bar, a die coating method, a casting method, A bar coating method, a slit coating method, a dispensing method, a squeezing method, an inkjet printing method, or an inkjet printing method may be applied.

Here, the same material may be applied to the filling solvent 155 (the first solvent) and the driving solvent 150 (the second solvent). However, the filling solvent 155 and the driving solvent 150 are not necessarily the same material, and the filling solvent 155 and the driving solvent 150 may be different materials depending on the method of filling the respective solvents.

In the above description, the charged particles 170 have been described as an example of being colored in colors of red, green, blue, and black. However, the present invention is not limited thereto, and the charged particles 170 may be colored in yellow, cyan, magenta, and white colors, and in this case, the manufacturing method described above is the same. Can be applied.

Subsequently, when the filling of the driving solvent 150 is completed in all the pixels, the outside of the panel is sealed with a sealant so that the driving solvent 150 and the charged particles 170 do not flow out of the panel.

In the method of manufacturing the electrophoretic display device according to the second embodiment of the present invention described above, the charged particles 170 are filled for each color of the pixel, and after the lower substrate 100 and the upper substrate 200 are bonded to all the pixels, The driving solvent 150 may be filled in to fill a uniform amount of the charged particles 170 and the driving solvent 150 in the entire pixel area.

In addition, while filling the charged particles 140 of the red, green and blue colors, it is possible to manufacture an electrophoretic display device capable of displaying high quality color images by preventing contamination and poor color mixing.

In addition, immediately after the filling of the driving solvent 150 is completed, the panel may be sealed to prevent the driving solvent 150 from volatilizing. Volatilization of the driving solvent 150 is suppressed to maintain uniform amounts of the charged particles 170 and the driving solvent 150 filled in all the pixels, thereby preventing a change in characteristics.

Also, by filling the driving solvent 150 in a state where the lower substrate 100 and the upper substrate 200 are bonded together, the charged particles 170 and the driving solvent 150 are overflowed to the outside of the active area and contaminated. Can be prevented.

In addition, it is possible to prevent the unfilling and overfilling of the electrophoretic dispersion to improve the display quality of the electrophoretic display and to ensure driving reliability.

In addition, it is possible to prevent defects due to unfilling and overfilling of the electrophoretic dispersion, thereby improving mass productivity and manufacturing efficiency of the electrophoretic display.

20 to 24 illustrate a method of manufacturing an electrophoretic display device according to a third exemplary embodiment of the present invention. Hereinafter, a method of manufacturing an electrophoretic display device according to a third exemplary embodiment of the present invention will be described with reference to FIGS. 20 through 24. In describing the method of manufacturing the electrophoretic display device according to the third exemplary embodiment of the present invention, detailed description of the same contents as those of the first and second exemplary embodiments will be omitted.

Referring to FIG. 20, a conductive layer such as copper, aluminum, ITO, or IZO is coated on the lower base substrate 110 to form a conductive layer. Thereafter, a photoresist is coated on the conductive layer, and a photolithography process and an etching process using the photoresist as a mask are performed to pattern the conductive layer.

The conductive layer is patterned to form a plurality of pixel electrodes 120 in a material of copper, aluminum, ITO, or IZO in each of the plurality of pixel regions. Meanwhile,

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

Next, referring to FIG. 21, an organic material is coated on the lower base substrate 110 on which the pixel electrode 120 is formed, and then patterned to form a spacer 130 in the pixel region. In this case, the spacer 130 may be formed between the pixel electrodes 120 to prevent the aperture ratio of the pixel from being lowered.

The spacer 130 has a columnar shape having a height of 10 μm to 100 μm, and is formed in a dot pattern where the pixel electrode 120 is not formed in the pixel area. A cell gap is formed by the spacer 130 to provide a filling space in which the electrophoretic dispersion is filled.

Here, the spacer 130 may be formed using not only the above-described photolithography method but also an imprinting or mold printing method.

The spacer 130 is formed of a nonpolar organic material to match the physical properties of the electrophoretic dispersion. Meanwhile, as another embodiment of the present invention, the spacer 130 may be formed of a nonpolar inorganic material.

Subsequently, referring to FIG. 22, the upper substrate 200 is manufactured by forming the common electrode 220 and the sealing layer 230 on the upper base substrate 210 (the second base substrate). 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. Thereafter, the upper and electrophoretic dispersions of the spacer 130 are sealed using the sealing layer 230, and the upper substrate 200 and the lower substrate 100 are bonded together.

The common electrode 220 is formed of a transparent conductive material such as ITO, and is formed in a plate shape to correspond to the entire pixel area. The sealing layer 230 may be formed by applying an adhesive material on the common electrode 220 and then performing an imprinting or photolithography process.

Meanwhile, after the sealing layer 230 is manufactured in a film type, the upper substrate 100 and the lower substrate 200 may be bonded using a lamination process.

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

Next, referring to FIG. 23, a container 500 containing a plurality of charged particles 140 and a driving solvent 150 is prepared. Thereafter, the bonded lower substrate 100 and the upper substrate 200 are vertically erected and immersed in the driving solvent 150 contained in the container 500.

Subsequently, referring to FIG. 24, an electrophoretic dispersion composed of a plurality of charged particles 140 and a driving solvent 150 charged with positive (+) and negative (−) polarities in a pixel region formed by the spacer 130. Fill it.

Specifically, a cell gap is formed between the lower substrate 100 and the upper substrate 200 of the panel by the spacer 130. When the driving solvent 150 contacts, the cell gap is driven in the space of the entire pixel region by capillary action. The solvent 150 and the plurality of charged particles 140 are filled at the same time.

The plurality of charged particles 140 are colored in a black color and a white color. The charged particles of black color may be formed of a carbon black material, and the charged particles of white color may be formed of titanium dioxide (TiO ₂ ).

The driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 140 may be moved by electrophoresis. As the driving solvent 150, the same material as that of the first and second embodiments described above may be applied.

Subsequently, when filling of the plurality of charged particles 140 and the driving solvent 150 is completed in the pixel area between the lower substrate 100 and the upper substrate 200, an outer edge of the lower substrate 100 and the upper substrate 200 is completed. The sealant is sealed with a sealant to prevent the plurality of charged particles 140 and the driving solvent 150 from flowing out.

In the method of manufacturing the electrophoretic display device according to the third embodiment of the present invention described above, after the lower substrate 100 and the upper substrate 200 are bonded together, the charged particles 140 and the driving solvent 150 are formed in the pixel area. After filling the charging particles 140 and the driving solvent 150, the panel is sealed immediately to prevent the driving solvent 150 from volatilizing.

As such, volatilization of the driving solvent 150 may be suppressed to maintain uniform amounts of the charged particles 140 and the driving solvent 150 filled in all the pixels, thereby preventing a change in characteristics.

In addition, the charged particles 140 and the driving solvent 150 are filled in the state where the lower substrate 100 and the upper substrate 200 are bonded to each other so that the charged particles 140 and the driving solvent 150 become active areas. ) It can be prevented from overflowing to the outside.

On the other hand, the electrophoretic dispersion filling process is a screen printing method using a squeeze bar, a die coating method, a casting method, a bar coating (in addition to the capillary phenomenon described above) A bar coating method, a slit coating method, a dispensing method, a squeezing method, an inkjet printing method, or the like may be applied.

25 to 33 illustrate a method of manufacturing an electrophoretic display device according to a fourth exemplary embodiment of the present invention. Hereinafter, a method of manufacturing an electrophoretic display device according to a fourth exemplary embodiment of the present invention will be described with reference to FIGS. 25 to 33. In the description of the manufacturing method of the electrophoretic display device according to the fourth embodiment of the present invention, detailed description of the same contents as those of the first to third embodiments will be omitted.

Referring to FIG. 25, a plurality of pixel electrodes 120 are formed on the base substrate 110. In this case, the pixel electrode 120 may be formed of an opaque metal of copper or aluminum, or may be formed of a conductive transparent material of ITO or IZO.

Next, referring to FIG. 26, an organic material is coated on the lower base substrate 110 on which the pixel electrode 120 is formed, and then patterned to form a spacer 160 in the pixel region.

The spacer 160 is formed as a stripe wall extending in one direction (lengthwise in the figure) to distinguish red pixels, green pixels, and blue pixels. In this case, the spacer 160 is formed to have a height of 10 μm to 100 μm to form a cell gap between the lower substrate 100 and the upper substrate 200.

Next, referring to FIG. 27, the upper substrate 200 is manufactured by forming the common electrode 220 and the sealing layer 230 on the upper base substrate 210. 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. Thereafter, the upper and electrophoretic dispersions of the spacer 130 are sealed using the sealing layer 230, and the upper substrate 200 and the lower substrate 100 are bonded together.

The material and manufacturing method of the upper base substrate 210, the common electrode 220, and the sealing layer 230 illustrated in FIG. 27 are the same as the manufacturing method of the electrophoretic display device according to the above-described embodiment.

Subsequently, an electrophoretic dispersion composed of a plurality of charged particles and a solvent charged with positive (+) and negative (−) polarities is filled in the pixel region formed by the spacer 160. At this time, the filling of the electrophoretic dispersion is sequentially performed for each color to be displayed by the pixel.

Referring to FIG. 28, a first container 510 containing a plurality of charged particles 170 and a driving solvent 150 colored in a black color and a red color is prepared.

Subsequently, the first mask 610 having the opening 612 that opens only the red pixels among all the pixels is aligned at one end of the lower substrate 100 and the upper substrate 200.

Thereafter, the bonded lower substrate 100 and the upper substrate 200 are vertically erected and immersed in the driving solvent 150 contained in the first container 510.

Subsequently, referring to FIG. 29, a cell gap is formed between the lower substrate 100 and the upper substrate 200 of the panel by the spacer 160. When the driving solvent 150 contacts, all of the red gaps are caused by capillary action. The driving solvent 150 and the charged particles 170 of black and red colors are filled in the filling space of the pixel.

Herein, the driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 170 may be moved by electrophoresis.

Then, when the filling of the driving solvent 150 and the charging particles 170 of the black color and the red color is completed in all the red pixel areas, the driving solvent 150 and the charged particles 170 flow outwardly in the red pixel area. Both ends of the red pixels are sealed with a sealant so as not to exit.

Subsequently, referring to FIG. 30, a second container 520 containing a plurality of charged particles 170 and a driving solvent 150 colored in a black color and a green color is prepared.

Thereafter, the second mask 620 having the opening 622 that opens only the green pixels among all the pixels is aligned at one end of the lower substrate 100 and the upper substrate 200.

Thereafter, the bonded lower substrate 100 and the upper substrate 200 are vertically erected and immersed in the driving solvent 150 contained in the second container 520.

Subsequently, referring to FIG. 31, a cell gap is formed between the lower substrate 100 and the upper substrate 200 of the panel by the spacer 160. The driving solvent 150 and the charged particles 170 of black and green colors are filled in the filling space of the pixel.

Here, the driving solvent 150 may be a non-polar organic material or a non-polar inorganic material having a viscosity of 10 cP ~ 10 KcP so that the charged particles 170 can be moved by electrophoresis, the same material as the above embodiment This can be applied.

After the filling of the driving solvent 150 and the charging particles 170 of the black color and the green color is completed in all of the green pixels, the driving solvent 150 and the charging particles 170 flow outwardly in the green pixel area. Both ends of the green pixels are sealed with a sealant so as not to exit.

Subsequently, referring to 32, a third container 530 containing a plurality of charged particles 170 and a driving solvent 150 colored in a black color and a blue color is prepared.

Subsequently, the third mask 630 having the opening 632 that opens only the blue pixels among all the pixels is aligned at one end of the lower substrate 100 and the upper substrate 200.

Thereafter, the lower substrate 100 and the upper substrate 200 are vertically oriented so as to be immersed in the driving solvent 150 contained in the third container 530.

Next, referring to FIG. 33, a cell gap is formed between the lower substrate 100 and the upper substrate 200 of the panel by the spacers 160. When the driving solvent 150 contacts, all of the blue gaps are caused by capillary action. The driving solvent 150 and the charged particles 170 of black and blue colors are filled in the pixel space.

Herein, the driving solvent 150 may be a nonpolar organic material or a nonpolar inorganic material having a viscosity of 10 cP to 10 KcP so that the charged particles 170 may be moved by electrophoresis.

Subsequently, when the filling of the driving solvent 150 and the charging particles 170 of the black color and the blue color is completed in all of the blue pixels, the driving solvent 150 and the charging particles 170 flow to the outside in the blue pixel area. Both ends of the blue pixels are sealed with a sealant so as not to exit.

As the driving solvent 150 of the method of manufacturing an electrophoretic display device according to the fourth embodiment of the present invention, the same material as that of the first to third embodiments may be used.

Here, the thicknesses of the first mask 610 to the third mask 630 may be 20 μm to 40 μm, and the hole sizes of the openings 612, 622, and 632 may be 30 μm to 60 μm. have.

The first mask 610 to the third mask 630 may be a metal mask made of nickel, an organic mask made of the same material as the spacer 130, or an inorganic mask. Meanwhile, a mesh mask may be used.

On the other hand, the electrophoretic dispersion filling process consisting of a plurality of charged particles 170 and the driving solvent 150, in addition to the method using the capillary phenomenon described above, a screen printing method using a squeeze bar (screen printing), die coating Die coating method, casting method, bar coating method, slit coating method, dispensing method, squeezing method, method or inkjet printing method This may apply.

In the above description, the charged particles 170 in the filling process have been described as being colored in red, green, blue, and black colors as an example. However, the present invention is not limited thereto, and the charged particles 170 may be colored in yellow, cyan, magenta, and white colors. Even in such a case, the above-described manufacturing method can be applied in the same way.

In the method of manufacturing the electrophoretic display device according to the fourth exemplary embodiment, the charged particles 170 and the driving solvent 150 for each color of the pixels after the lower substrate 100 and the upper substrate 200 are bonded together. After filling the charged particles 170 and the driving solvent 150 is completed, the substrate is sealed immediately to prevent the driving solvent 150 is volatilized.

In the method of manufacturing the electrophoretic display device according to the fourth exemplary embodiment of the present invention, volatilization of the driving solvent 150 is suppressed, and thus the characteristics of the charged particles and the driving solvent 150 filled in all the pixels are uniformly maintained to change characteristics. Can be prevented.

In addition, the charged particles 170 and the driving solvent 150 are filled in the state where the lower substrate 100 and the upper substrate 200 are bonded to each other so that the charged particles 170 and the driving solvent 150 become active areas. ) It can be prevented from overflowing to the outside.

In addition, it is possible to prevent the unfilling and overfilling of the electrophoretic dispersion to improve the display quality of the electrophoretic display and to ensure driving reliability.

In addition, it is possible to prevent defects due to unfilling and overfilling of the electrophoretic dispersion, thereby improving mass productivity and manufacturing efficiency of the electrophoretic display.

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.

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

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

100: lower substrate 110: lower base substrate
120: pixel electrode 130, 160: spacer
140, 170: charged particles 150: solvent
200: upper substrate 210: upper base substrate
220: common electrode 230: sealing layer
300, 310, 320, 330: masks 302, 312, 322, 332: openings
500, 510, 520, 530: container 610, 620, 630: mask
612, 622, 632: opening

Claims (15)

An upper substrate on which a common electrode is formed;
A lower substrate having pixel electrodes formed in each pixel area;
A spacer formed between the upper substrate and the lower substrate to form a cell gap;
An electrophoretic display device comprising charged particles and a solvent filled in a pixel region formed by the sal gap. The method of claim 1,
The spacer is formed in a columnar shape, the electrophoretic display device, characterized in that formed in a dot pattern in the pixel area. The method of claim 1,
And the spacers are formed as stripe barrier ribs extending in one direction to distinguish red pixels, green pixels, and blue pixels. The method of claim 1,
The charged particles are electrophoretic display device characterized in that the red color, green color, blue color, yellow color, cyan color, magenta color, black color and white color are selectively colored. The method of claim 1,
And a sealing layer sealing and bonding the lower substrate and the upper substrate. Forming a plurality of pixel electrodes in each of the plurality of pixel regions defined in the lower substrate;
Forming a spacer having a predetermined height between the plurality of pixel electrodes;
Filling charged pixel colored in a specific color into a pixel region between the bonded upper substrate and the lower substrate;
Bonding the upper substrate and the lower substrate on which the common electrode is formed;
Filling a driving solvent into the pixel region filled with the charged particles; And
And sealing the pixel region in which the charged particles and the driving solvent have been filled. The method according to claim 6,
In the filling of the charged particles,
And a filling solvent is filled in the pixel area together with the charged particles. The method of claim 7, wherein
And volatilizing a part or all of the filling solvent filled in the pixel region. The method according to claim 6,
And erecting the bonded upper and lower substrates in a vertical direction, and then filling the driving solvent in the pixel region by immersing a driving solvent in a container. Forming a plurality of pixel electrodes in each of the plurality of pixel regions defined in the lower substrate;
Forming a spacer having a predetermined height between the plurality of pixel electrodes;
Bonding the upper substrate and the lower substrate on which the common electrode is formed;
Filling the pixel region between the bonded upper substrate and the lower substrate with charged particles and driving solvent colored in a specific color; And
And sealing the pixel region in which the charged particles and the driving solvent have been filled. 11. The method of claim 10,
After manufacturing the bonded upper substrate and the lower substrate in the vertical direction, the electrophoretic display device is filled with the charged particles and the driving solvent in the pixel region by immersing the charged particles and the driving solvent in the container. Way. 11. The method according to claim 6 or 10,
The charging particle is a manufacturing method of an electrophoretic display device characterized in that the red color, green color, blue color, yellow color, cyan color, magenta color, black color and white color are selectively colored. 13. The method of claim 12,
And when the charged particles are colored in a black color and a white color, charging of the charged particles and a driving solvent is simultaneously performed in all pixel areas. 13. The method of claim 12,
When the charged particles are colored in the red, green, blue, and black colors, electrophoresis of the charged particles and the driving solvent is sequentially performed on each of the red pixel area, the green pixel area, and the blue pixel area. Method for manufacturing a display device. 15. The method of claim 14,
When the filling of the charged particles and the driving solvent is completed in each of the red pixel area, the green pixel area, and the blue pixel area, the red pixel area, the green pixel area, and the blue pixel area are respectively sealed so that the driving solvent is not volatilized. Method of manufacturing an electrophoretic display device.

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