KR101253211B1 - Electrophoretic display device and method for manufacturing thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display device, and more particularly, to an electrophoretic display device having an improved front reflectance by having an electrode having a curved optical pattern and a method of manufacturing the same.

An electrophoretic display of the present invention comprises: a first substrate on which a first electrode of a transparent material having a front reflective optical pattern having a front reflectance is formed; A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate; And an image display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes.

Description

Electrophoretic display device and its manufacturing method {ELECTROPHORETIC DISPLAY DEVICE AND METHOD FOR MANUFACTURING THEREOF}

1 is a cross-sectional view showing the structure of a conventional electrophoretic display.

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

3 is a cross-sectional view showing the structure of a modification of the electrophoretic display according to the first embodiment of the present invention.

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

5A to 5G are perspective views or cross-sectional views illustrating respective processes of the method of manufacturing an electrophoretic display device according to an exemplary embodiment of the present invention.

Description of the Related Art

1: conventional electrophoretic display device

100, 100a: electrophoretic display device according to a first embodiment of the present invention

200: electrophoretic display device according to a second embodiment of the present invention

10, 110, 210: first substrate

12, 112, 212: first electrode

20, 120, 220: second substrate

22, 122, 222: second electrode

30, 130, 230: bulkhead

40, 140, 140a, 240: video display layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display device, and more particularly, to an electrophoretic display device having an improved front reflectance by having an electrode having a curved optical pattern and a method of manufacturing the same.

The electrophoretic display device refers to a device for displaying an image by using an electrophoretic phenomenon in which colored fine particles move by an electric field applied from the outside. The electrophoretic phenomenon herein refers to a phenomenon in which charged fine particles move in a liquid by a Coulomb force when an electric field is applied to a dispersion system in which charged fine particles are dispersed in a liquid.

In general, an electrophoretic display fills an insulating material 42 between opposing substrates 10 and 20 in the state where electrodes 12 and 22 are formed, respectively, and white particles 44 and colored charged on the insulating material. It has a structure in which the particles 46 are dispersed. Since the electrophoretic display device having such a structure is a completely reflective display device, unlike LCD, PDP, or OLED, the power consumption is low and the display quality is similar to the printed material, which has the advantage of low eye fatigue. Therefore, it is expected to be widely used in the future.

However, in the conventional electrophoretic display device, as shown in FIG. 1, the surface of the electrode 12 to which external light is incident and reflected has a planar shape. Therefore, the light which is not incident from the front of the electrode and is incident from the side is reflected to the opposite side by the same reflection angle θ2 as the incident angle θ1, as shown in FIG. Therefore, the ratio of the light reflected in the front direction of the electrophoretic display is low. On the other hand, in general, the user who is located in the front direction of the electrophoretic display sees a low luminance image. Therefore, the development of an electrophoretic display device capable of improving the reflectance toward the user is required.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an electrophoretic display device having an improved front reflectance by providing an electrode having a curved optical pattern and a method of manufacturing the same.

According to an aspect of the present invention, there is provided an electrophoretic display device, including: a first substrate on which a first electrode of a transparent material having a front reflective optical pattern having a front reflectance is formed; A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate; And an image display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes.

Specifically, the electrophoretic display of the present invention comprises: a first substrate on which a first electrode of a transparent material having a convex optical pattern is formed; A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate; And an image display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes.

Here, the first substrate may include a transparent substrate having a plurality of concave patterns formed on the lower surface thereof that match the convex optical pattern; and a transparent electrode formed along the concave pattern on the lower surface of the transparent substrate; It is characterized by including.

In addition, it is preferable that a partition insertion groove in which a portion of the upper end of the partition wall is inserted is formed at the boundary of the convex optical pattern to closely contact the image display layer and the transparent electrode without a gap.

The image display layer may include an insulating material filled in a space formed by the first substrate, the second substrate, and the partition wall; White charged particles dispersed in the insulating material, and charged with a charge of a certain polarity; And colored charged particles dispersed in the insulating material and charged with charges of opposite polarity to the white charged particles.

In this case, the insulating material may be a gas, or may be an electron sorter.

The image display layer may include a plurality of capsules disposed in a space between the first and second substrates and the partition wall; An insulating material filled in the capsule; White charged particles dispersed in the insulating material, and charged with a charge of a certain polarity; Dispersed in the insulating material, it may have a structure consisting of colored charged particles charged with a charge of the opposite polarity to the white charged particles.

At this time, the upper surface of the capsule is inserted into the convex optical pattern, and is in close contact with the lower surface of the first electrode, it is preferable to maximize the front reflectance.

The image display layer may include a plurality of capsules disposed in a space between the first and second substrates and the partition wall; It may be composed of an electron sorter filled in the capsule.

On the other hand, another electrophoretic display device of the present invention for achieving the above-described technical problem, the first substrate is formed with a first electrode of a transparent material having a concave optical pattern; A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate; And an image display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes.

The first substrate may include: a transparent substrate having a plurality of convex patterns formed on a lower surface thereof to match the concave optical pattern; and a transparent electrode formed along the convex pattern on a bottom surface of the transparent substrate; Characterized in that it comprises a.

The first substrate is preferably provided with a partition insertion groove in which a portion of the upper end of the partition wall is inserted in a boundary portion of the concave optical pattern, so that the image display layer and the first electrode can be brought into close contact with each other without a gap.

The image display layer may include an insulating material filled in a space formed by the first substrate, the second substrate, and the partition wall; White charged particles dispersed in the insulating material, and charged with a charge of a certain polarity; Dispersed and disposed in the insulating material, characterized in that consisting of colored charged particles charged with a charge of the opposite polarity to the white charged particles.

In this case, the insulating material may be a gas or a liquid.

On the other hand, an electrophoretic display device manufacturing method of the present invention for achieving the above technical problem, forming an optical pattern having a curved surface on one surface of the first substrate; Forming a first electrode of a transparent material along the optical pattern on a surface of the first substrate on which the optical pattern is formed; Forming a second electrode of a transparent material on a surface of the second substrate; Forming a partition pattern on the second substrate; Forming an image display layer on the second substrate; And combining the first substrate and the second substrate.

The forming of the optical pattern may include forming an organic layer on one surface of the first substrate; And forming an optical pattern having the curved shape by patterning the organic layer by a photolithography process.

In the forming of the optical pattern, an optical pattern may be formed using an imprint process.

Other technical problems and features of the present invention in addition to the above technical problem will become apparent through the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 5G. 2 and 3 are cross-sectional views illustrating a structure of an electrophoretic display device according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view showing a structure of an electrophoretic display device according to a second embodiment of the present invention. . 5A to 5G are perspective views or cross-sectional views illustrating each process of the method for manufacturing an electrophoretic display device according to an exemplary embodiment of the present invention.

≪ Example 1 >

As illustrated in FIG. 2, the electrophoretic display device 100 according to the present exemplary embodiment includes a first substrate 110, a second substrate 120, a partition wall 130, and an image display layer 140. do.

First, the first substrate 110 is formed of a transparent material, and the first electrode 112 provided on the first substrate 110 is also formed of a transparent material. This is to allow light incident from the outside to pass through the image display layer 140 without loss and to irradiate the light reflected from the image display layer 140 to the user side without loss. The first electrode 112 functions as a common electrode in the driving process of the electrophoretic display.

Therefore, in the present embodiment, the first substrate 110 is composed of a transparent substrate 114 and a transparent electrode 112, as shown in FIG. At this time, a plurality of concave patterns are formed on the lower surface of the transparent substrate 114. A transparent first electrode 112 is formed on the bottom surface of the transparent substrate 114. The first electrode 112 has a convex optical pattern formed along the concave pattern 111a. do. At this time, the pitch of the convex optical pattern is determined according to the size of the space between the partition wall 130, the curvature has a value that can maximize the ratio of the light reflected in the front direction.

In addition, the partition insertion groove 116 is preferably formed at a boundary of the convex optical pattern to insert a portion of the upper end of the partition 130. As shown in FIG. 2, the partition insertion groove 116 is formed at a boundary between the convex optical patterns and is coupled to an upper end of the partition 130. When the partition insertion groove 116 is formed as described above, the surface of the first electrode 112 may be located below the top of the partition 130. When the first electrode 112 is positioned below the top of the barrier rib 130, a gap, which is an empty space, does not occur between the upper surface of the image display layer 140 filled in the space between the barrier ribs. Therefore, the upper surface of the image display layer 140 is completely in contact with the optical pattern of the first electrode 112 to have a curved surface of the same shape, the front surface reflectance is increased by the curved shape.

Here, the "front reflectance" refers to the ratio of the light incident on the electrophoretic display to the light reflected in a direction substantially perpendicular to the electrophoretic display and reflected toward the user located in this direction. It is the ratio of light to be. Therefore, when the front reflectance is high, the ratio of light reflected toward the user is high, so that the luminance felt by the user is increased even in external light having the same brightness.

In addition, as described above, when the partition insertion groove 116 is formed so that the first electrode 112 is in close contact with the image display layer 140, the partition wall insertion groove 116 is formed with the second electrode 122 formed on the second substrate 120. The gap is also small. When the distance between the first electrode 112 and the second electrode 122 is reduced in this way, the voltage applied between both electrodes to drive the image display layer 140 may be small, so that the power consumption is reduced. There is also.

Meanwhile, the second substrate 120 is disposed at a position opposite to the first substrate 110 and the second electrode 122 is formed. Unlike the first electrode 112, the second electrode 122 is patterned for each space formed by the partition wall 130. Further, a thin film transistor or the like is further formed on the second substrate 120 as a switching element for applying a voltage independently for each of the second electrodes 122.

Next, the partition wall 130 is disposed between the first substrate 110 and the second substrate 120 to partition the space between the first substrate 110 and the second substrate 120. That is, as shown in FIG. 2, the spaces between the first substrate 110 and the second substrate 120 are separated from each other based on the partition wall 130. An independent space of a predetermined size is formed by the partition 130, which is called a 'cell'. As shown in FIG. 2, the optical pattern of the first electrode 112 is formed to have a pitch equal to the size of a cell formed by the partition wall 130. Therefore, one optical pattern corresponds to each cell.

In addition, the image display layer 140 is filled in a space formed by the first substrate 110, the second substrate 120, and the partition wall 130. The image display layer 140 includes the first and second electrodes. It is driven by an electric field formed by (112, 122) to display an image.

In the present embodiment, the image display layer 140 is implemented in two ways.

First, as illustrated in FIG. 2, the image display layer 140 may be formed of an insulating material 142, white charged particles 144, and colored charged particles 146.

The insulating material 142 may be liquid, gaseous, or transparent to allow light to pass therethrough. In addition, the insulating material 142, as its name suggests, has non-conductive insulation and should not be affected by an electric field.

Next, the white charged particles 144 are dispersed and disposed in the insulating material 142, and are charged particles having a predetermined polarity of charge. Since the white charged particles 144 are charged with (+) or (-), they move in a specific direction by an electric field formed by applying DC voltages having different polarities to the first and second electrodes 112 and 122, respectively. do. For example, when the white charged particles 144 are charged with a positive charge, they are drawn toward the first electrode 112 to which the (−) power is applied to reflect all of the light incident from the outside. Then, the electrophoretic display device 100 displays white color at this time.

On the other hand, the colored charged particles 146 are dispersed and disposed in the insulating material 142, and are charged particles having a polarity opposite to that of the white charged particles 144. Since the colored charged particles 146 are charged with the opposite polarity to the white charged particles 144, when the power is applied to the first and second electrodes 112 and 122, the colored charged particles 144 are opposite to the white charged particles 144. Move in the direction of The colored charged particles 146 are colored differently from the white charged particles 144, and are generally colored black or blue. However, when implementing a color image other than black and white, it may be colored in various other colors.

The image display layer 140 may be formed of an electronic classifier. The electron classifier is a material developed by Bridgestone of Japan, and the solid powder is a liquid-like material, also known as liquid like powder. This electronic classifier is charged with electricity and colored so that it moves in the air when energized. The color is expressed using the characteristics moved by the voltage and used as the image display layer. This electron classifier is easy to manufacture because it moves air in medium, and since no gap is generated between the first electrode and the image display layer, it is an image display layer which is very suitable for the electrophoretic display device of this embodiment.

In addition, as shown in FIG. 3, the image display layer 140a may include a capsule 141a, an insulating material 142a, white charged particles 144a, and colored charged particles 146a. Here, the capsule 141a is disposed in a space between the first and second substrates 110 and 120 and the partition wall 130, and defines a moving space of the white charged particles 144a and the colored charged particles 146a. It plays a role. When the insulating material is directly filled between the first and second substrates, sedimentation of charged particles may occur, so that the insulating material is included in the capsule to prevent this. Of course, the response speed of the image display layer is also improved. At this time, the upper surface of the capsule 141a is inserted into the convex optical pattern of the first electrode 112 and is in close contact with the lower surface of the first electrode 112 without a space. Therefore, the size and curvature of the convex optical pattern is preferably formed to be approximately equal to the size and curvature of the capsule 141a.

The capsule 141a is filled with an insulating material 142a, white charged particles 144a and colored charged particles 146a. The structure and function of the insulating material, white charged particles and colored charged particles are described above. As it is the same as the above, it will not be repeated here.

The capsule 141a may be filled with air and an electron sorter to display an image.

≪ Example 2 >

As illustrated in FIG. 4, the electrophoretic display 200 according to the present exemplary embodiment includes a first substrate 210, a second substrate 220, a barrier rib 230, and an image display layer 240.

First, the first substrate 210 is formed of a transparent material, and the first electrode 212 provided on the first substrate 210 is also formed of a transparent material. This is to allow light incident from the outside to pass through the image display layer 240 without loss and to radiate light reflected from the image display layer 240 to the user without loss. The first electrode 212 functions as a common electrode in the driving process of the electrophoretic display.

The first electrode 212 has a concave optical pattern, as shown in FIG. 4, unlike the 112 of the first embodiment described above. In the case where the concave optical pattern is provided, the surface of the first electrode 212 enters the space between the partition walls 230 during the manufacturing of the electrophoretic display to fill the space between the partition walls 230. The surface of the layer 240 and the first electrode 212 are in close contact with each other, and no space is generated. At this time, the pitch of the concave optical pattern is determined according to the size of the space between the partition walls, the curvature has a value that can maximize the ratio of the light reflected in the front direction.

Meanwhile, since the second substrate 220, the partition wall 230, and the image display layer 240 have substantially the same structure and function as those of the above-described first embodiment 120, 130, and 140, the description thereof will not be repeated herein. .

<Example 3>

Hereinafter, a method of manufacturing an electrophoretic display device according to an exemplary embodiment will be described with reference to FIGS. 5A to 5H. 5A to 5H are diagrams illustrating each process of the method of manufacturing the electrophoretic display device according to the present embodiment.

First, as shown in FIG. 5A, the first electrode 122 is formed on the surface of the second substrate 124. Of course, a thin film transistor is further formed on the second substrate 124 as a switching element that determines a time for applying a voltage to the second electrode 122 and a magnitude of the applied voltage, and the thin film transistor is connected to the second electrode. Connected.

In this case, the second electrode 122 has a predetermined pattern on the second substrate 124, which corresponds to the partition pattern formed on the second substrate 124 in the future. That is, as shown in FIG. 5A, one second electrode 122 is formed in a cell unit formed by the partition wall.

Next, as shown in FIG. 5B, a partition 130 pattern is formed on the second substrate 124. The partition wall 130 is composed of a horizontal partition wall and a vertical partition wall, and the horizontal partition wall and the vertical partition wall meet to form a cell. Then, a cube having an upper portion formed by the partition wall 130 and the second substrate 120 is formed.

Then, as illustrated in FIG. 5C, the image display layer 140 is formed on the second substrate 120. That is, the image display layer 140 is formed in the cell formed by the barrier 130 and the second substrate 120. In this case, the image display layer 140 may be formed of an insulating material, white charged particles, colored charged particles, or may be an electron sorter. It may also be a capsule filled with an insulating material, white charged particles and colored charged particles.

Next, a step of forming an optical pattern having a curved shape on the surface of the first substrate 110 is performed. The step of forming this optical pattern is divided into two sub-steps.

First, as shown in FIG. 5D, an organic layer 111 having a predetermined thickness is formed on one surface of the transparent substrate 112.

Then, as shown in FIG. 5E, the organic layer 111 is patterned to form an optical pattern 111a having a curved shape. In this case, the forming of the optical pattern 111a may use a photolithography process. Meanwhile, an optical pattern is formed by using an imprint process. In this case, a thermosetting or ultraviolet curable organic film is formed on the upper surface of the transparent substrate with a constant thickness, and then the optical pattern is formed by using a mold having a shape opposite to that of the optical pattern. Then, curing using heat or ultraviolet light and removing the mold, an optical pattern is formed on the transparent substrate. Using this imprint process, an optical pattern can be formed in a simpler process than using a photolithography process.

Next, as shown in FIG. 5F, a second electrode 112 of a transparent material is formed along the optical pattern on the surface of the first substrate 112 on which the optical pattern 111a is formed. That is, when an electrode having a thin thickness is deposited in the state in which the optical pattern is formed on the first substrate 114, an electrode having a constant optical pattern is formed along the optical pattern formed on the first substrate 114. Will be.

Meanwhile, the forming of the optical pattern on the first substrate and the forming of the first electrode may be performed in the same order as the first electrode forming step, the barrier rib forming step, and the image display layer forming step.

Next, the second substrate 120 on which the second electrode 122 is formed is combined with the first substrate 110. At this time, it is important that the top of the partition wall is accurately inserted into the partition wall insertion groove 116 by matching the positions of the partition wall insertion groove 116 and the top of the partition wall 130 formed in the first substrate 110. When the second substrate 120 and the first substrate 110 are combined in this way, an electrophoretic display device having a structure as shown in FIG. 5G is completed.

According to the present invention, as shown in FIG. 5G, since the light incident from the side of the electrophoretic display is reflected toward the front side of the electrophoretic display, the brightness felt by the user located in the front direction of the electrophoretic display is improved. It has the advantage of being.

In addition, according to the present invention, there are advantages in that various materials such as gas or liquid can be applied as an insulating material of the image display layer by using optical patterns having various shapes.

Claims (21)

A first substrate comprising an organic film provided with front reflective optical patterns for enhancing a front reflectivity, and a first electrode of transparent material on the organic film provided with the front reflective optical patterns, A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate, and A video display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes, And a partition insertion groove in which an upper portion of the partition wall is inserted in a space between the front reflective optical patterns, in the organic layer provided with the front reflective optical patterns. A first substrate comprising an organic film provided with convex top reflective optical patterns and a first electrode of transparent material on the organic film provided with the front reflective optical patterns, A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate, and A video display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes, And a partition insertion groove in which an upper portion of the partition wall is inserted in a space between the front reflective optical patterns, in the organic layer provided with the front reflective optical patterns. The method of claim 2, wherein the first substrate, The lower substrate is formed of a transparent substrate formed with a plurality of concave patterns matching the convex front reflective optical patterns, the first electrode is formed along the concave pattern on the lower surface of the transparent substrate Electrophoretic display device characterized in that. delete The display device of claim 2, wherein the video display layer includes: An insulating material filled in the space formed by the first substrate, the second substrate, and the partition wall, White charged particles dispersed in the insulating material and charged with a charge of a certain polarity, and The electrophoretic display device, wherein the electrophoretic display device is dispersed and disposed in the insulating material, and the colored charged particles are charged with charges of opposite polarity to the white charged particles. The method of claim 5, wherein the insulating material, Electrophoretic display device characterized in that the gas. The display device of claim 2, wherein the video display layer includes: Electrophoretic display device characterized in that the electronic sorting body. The display device of claim 2, wherein the video display layer includes: A plurality of capsules disposed in a space between the first and second substrates and the partition wall, Insulating material filled in the capsule, White charged particles dispersed in the insulating material and charged with a charge of a certain polarity, and The electrophoretic display device, wherein the electrophoretic display device is dispersed and disposed in the insulating material, and the colored charged particles are charged with charges of opposite polarity to the white charged particles. 9. The method of claim 8, And the upper surface of the capsule is inserted into the convex front reflective optical patterns to be in close contact with the lower surface of the first electrode. The display device of claim 2, wherein the video display layer includes: A plurality of capsules disposed in a space between the first and second substrates and the partition wall, and An electrophoretic display device comprising an electron sorter filled in the capsule. A first substrate comprising an organic film provided with concave front reflective optical patterns and a first electrode of transparent material on the organic film provided with the concave front reflective optical patterns, A second substrate disposed at a position opposite to the first substrate and having a second electrode formed thereon; A partition wall disposed between the first substrate and the second substrate to partition a space between the first substrate and the second substrate, and A video display layer filled in a space formed by the first substrate, the second substrate, and the partition wall, and displaying an image by an electric field formed by the first and second electrodes, And a partition insertion groove in which an upper portion of the partition wall is inserted in a space between the front reflective optical patterns, in the organic layer provided with the front reflective optical patterns. The method of claim 11, wherein the first substrate, The lower substrate is formed of a transparent substrate formed with a plurality of convex patterns matching the concave front reflective optical patterns, the first electrode is formed along the convex patterns on the lower surface of the transparent substrate Electrophoretic display device characterized in that. delete The method of claim 11, wherein the video display layer, An insulating material filled in the space formed by the first substrate, the second substrate, and the partition wall, White charged particles dispersed in the insulating material and charged with a charge of a certain polarity, and The electrophoretic display device, wherein the electrophoretic display device is dispersed and disposed in the insulating material, and the colored charged particles are charged with charges of opposite polarity to the white charged particles. The method of claim 14, wherein the insulating material, Electrophoretic display device characterized in that the gas. The method of claim 14, wherein the insulating material, Electrophoretic display, characterized in that the liquid. The method of claim 11, wherein the video display layer, Electrophoretic display device characterized in that the electronic sorting body. Forming an organic film having a curved surface on one surface of the first substrate and provided with front reflective optical patterns having a partition insertion groove; Forming a first electrode of a transparent material along the front reflective optical patterns on a surface of a first substrate on which an organic layer provided with the front reflective optical patterns is formed; Forming a second electrode of a transparent material on a surface of the second substrate; Forming barrier rib patterns on the second substrate; Forming an image display layer on the second substrate; And Coupling the first substrate and the second substrate; Electrophoretic display device manufacturing method comprising a. The method of claim 18, wherein forming the organic film provided with the front reflective optical patterns comprises: Forming an organic layer on one surface of the first substrate; And Patterning the organic layer by a photolithography process to form the front reflective optical patterns having the curved shape; Electrophoretic display device manufacturing method characterized in that consisting of a small step of. The method of claim 18, wherein forming the front reflective optical patterns comprises: A method for manufacturing an electrophoretic display device, comprising forming the front reflective optical patterns using an imprint process. The method of claim 18, wherein the video display layer, And applying an electron sorter to a space formed by the first substrate and the partition patterns.

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