KR101284921B1 - electrophoretic display device and manufacturing method thereof - Google Patents

Abstract

An electrophoretic display device capable of displaying an image on both sides of the present invention includes: a substrate having a plurality of pixel cells defined by a plurality of gate lines and a plurality of data lines; A common electrode formed on a predetermined area of the pixel cell and formed of a transparent conductive material on the substrate; A switching element formed in an area where the gate line and the data line cross each other; A passivation film formed over the substrate and protecting the switching device, the passivation film including a contact hole; A first electrode connected to the switching element through the contact hole and formed of a transparent conductive material in the pixel cell region so as to overlap the common electrode on the passivation layer; And an ink layer including a second electrode to which a predetermined voltage is applied and a plurality of charged particles having a charge on the first electrode.

Accordingly, the electrophoretic display device according to the present invention can display on both sides without providing additional power for displaying on both sides, and can provide a display device having excellent viewing angle and visibility with low power consumption.

In addition, the electrophoretic display device can display an image on both sides with one display device, and thus has an effect of providing a public display function that can be used by a public place or by a plurality of users.

Description

Electrophoretic display device and manufacturing method

1A is a plan view of a conventional electrophoretic display.

1B is a sectional view taken along line II ′ of FIG. 1A;

Figure 2 is a view showing the back of the conventional electrophoretic display device.

3A is a plan view of an electrophoretic display device according to the present invention;

FIG. 3B is a cross-sectional view taken along line II-II 'of FIG. 3A;

4 illustrates an ink layer of an electrophoretic display device according to the present invention.

5A illustrates a front display of an electrophoretic display device according to the present invention;

Figure 5b is a view showing a rear display of the electrophoretic display device according to the present invention.

6A through 6D are process diagrams for forming a driver layer of the electrophoretic display device according to the present invention;

 (Explanation of symbols for the main parts of the drawing)

  1 electrophoresis display device 3 ink layer

  5 driver layer 7 pixel cell

 10: substrate 20: common electrode

 30: gate line 32: gate electrode

 35 common line 40 gate insulating film

 50: semiconductor layer 60: data line

 70 passivation film 80 first electrode

110: charged particle 120: second electrode

The present invention relates to a display device, and more particularly to an electrophoretic display device.

Today, a large amount of information can be carried, and a display device such as a personal computer that can convey a large amount of information can read articles such as newspapers and magazines, but the amount of information that can be carried in a fast paced information society Information is transmitted by a medium such as a few newspapers and magazines.

 As such, the reason why the newspapers and magazines do not disappear is that power to maintain a screen for a long time to turn on the display device and wait for a while to use the display device and to read the newspapers and magazines is large. There are disadvantages.

Therefore, there is a need for a display device capable of solving the disadvantages of the display device and displaying contents such as newspapers and magazines. As such, the electronic paper may be implemented by the display device.

The electronic paper may be formed in a thin thickness and is a display capable of displaying and deleting data by electrical means. In other words, electronic paper capable of expressing text and images is expected to be a medium that can deliver information quickly by combining features of traditional print media and features of video screens.

In addition, the electronic paper has been highlighted as a new display device with emphasis on high visibility and simplicity, which is weak in a liquid crystal display device.

The electronic paper may be implemented by using a charging bead, a method of driving a charged particle by electrophoresis, and the like.

As an embodiment, a method of driving charged particles by electrophoresis will be described, and a display device driven by the above method will be referred to as an electrophoretic display device.

The electrophoretic display has a characteristic that the screen does not disappear even when the power is turned off, compared to the conventional flat panel display. As a result, the electrophoretic display needs to apply power only to change the screen, thereby achieving low power consumption and securing the same characteristics as conventional paper.

1A and 1B are diagrams for describing a conventional electrophoretic display device. 1A is a plan view illustrating a conventional electrophoretic display, and FIG. 1B is a cross-sectional view taken along line II ′ of FIG. 1A.

1A and 1B, in the electrophoretic display 501, a plurality of gate lines 530 and data lines 560 intersect each other on a substrate 510. In this case, an area partitioned by the gate 530 and the data line 560 is defined as an area of a pixel cell 507.

In addition, the electrophoretic display 501 is formed in parallel with the gate line 530, and the common line 520 is spaced apart from each other at a predetermined interval.

Here, a common electrode 525 connected to the common line 520 is formed in an area of the pixel cell 507. The common electrode 525 occupies a predetermined area of an area of the pixel cell 507 and overlaps with a metal formed on the common electrode 525 to form a display voltage holding capacity of the electrophoretic display 501. Do it.

A thin film transistor TR is formed at an intersection of the gate line 530 and the data line 560. That is, the thin film transistor TR includes a gate electrode 532, a semiconductor layer 550, and source / drain electrodes 560a and 560b.

In detail, a gate insulating layer 540 is formed on the gate line 530, and a data line 560 is formed on the gate insulating layer 540. Here, a source electrode 560a is connected to the data line 560, and the drain electrode 560b is formed to be spaced apart from the source electrode 560a with the semiconductor layer 550 interposed therebetween. The passivation layer 570 is formed on the data line 560.

The drain electrode 560b is formed with a drain 565 extending to the pixel cell 507 to serve as a capacitor. That is, the drain part 565 overlaps with the common electrode 525 below.

In the case where the electrophoretic display device 501 is an electronic paper which must maintain one image for a long time, the characteristic of the voltage holding ratio is important. Here, the voltage holding ratio means a holding ratio for maintaining the voltage in maintaining the voltage until the next signal voltage is applied after the signal voltage is applied.

At this time, in order for the electrophoretic apparatus 501 to maintain the voltage holding ratio characteristic, large capacitance is required. Thus, the electrophoretic display 501 has a large overlapping area between the common electrode 525 formed of an opaque metal film and the opaque drain 565.

As described above, as the drain part 565 overlaps with the common electrode 525, the electrophoretic display device 501 may have a display voltage holding capacity, thereby maintaining a display screen.

That is, unless the electric signal for rewriting is sent, the content displayed once does not consume electricity and maintains the display screen as it is. Therefore, the electrophoretic display 501 has an advantage of low power consumption.

A passivation layer 570 is formed on the source / drain electrodes 560a and 560b, the drain portion 565, the data line 560, and the like to protect the lines and the thin film transistor TR.

A passivation hole 575 is formed in the passivation layer 570 to partially expose the drain electrode 560b.

In this case, a first electrode 580 electrically connected to the drain electrode 560b is formed on the passivation layer 570. The first electrode 580 is formed to include the pixel cell 507 region, the gate line 530, and the data line 560.

Although not shown, an ink layer having a capsul having a plurality of charged particles and a second electrode to which a predetermined voltage is applied is provided on the first electrode 580.

Here, the plurality of charged particles provided in the ink layer is moved by the electric field. Here, the charged particles may use titanium oxide (TiO ₂ ) as the white color and carbon black (Carbon-Black) as the black color.

As described above, the electrophoretic display device 501 may display an image by moving the charged particles included in the ink layer by the electric fields formed on the first electrode 580 and the second electrode.

In this case, the electrophoretic display 501 may have a wide viewing angle because the electrophoretic display 501 is not a method of displaying an image by polarized light like a liquid crystal display.

2 is a diagram illustrating a rear surface of a conventional electrophoretic display device.

As shown in FIG. 2, the electrophoretic display device 501 is formed of an opaque metal with a plurality of lines 530 and 560 connecting the switching element TR and an electrical signal.

The line is formed on the substrate surface by a gate line 530 formed in a horizontal direction and a pixel cell 507 defined by a data line 560 formed in a vertical direction.

The gate line 530 which is integral with the opaque gate electrode 532 is formed on the surface of the substrate at predetermined intervals. The common electrode 525 is formed in the pixel cell 507 region using the same opaque metal as the gate line 530. The common electrode 525 is connected to the common line 520.

The data line 560 is formed in a direction orthogonal to the gate line 530. The data line 560 is formed of an opaque metal. Here, a source electrode 560a integrated with the data line 560 and a drain electrode 560b spaced apart from the source electrode 560a by a predetermined distance are formed on the entire surface of the substrate.

In addition, the electrophoretic display device 501 has a drain portion 565, which acts as a capacitor, to extend the drain electrode 565 so as to occupy a large area in the pixel cell 507 region to maintain a display voltage holding capacitance. It is.

The drain portion 565 is formed of the same metal as the data line 560 and is formed of an opaque metal.

As described above, the electrophoretic display device 501 serves as a capacitor, and since the drain 565 and the common electrode 525 formed of an opaque metal are formed in a large area in the pixel cell 507 area, The rear surface of the electrophoretic display device 501 is obscured by an opaque metal so that the image cannot be clearly seen.

Accordingly, the display direction of the electrophoretic display device 501 is limited by the plurality of opaque lines 530 and 560, the opaque drain 565, and the common electrode 525.

It is an object of the present invention to provide a table market value capable of displaying a screen in both directions while maintaining the voltage holding ratio.

According to an aspect of the present invention, there is provided an electrophoretic display device including: a substrate having a plurality of pixel cells defined by a plurality of gate lines and a plurality of data lines; A common electrode formed on a predetermined area of the pixel cell and formed of a transparent conductive material on the substrate; A switching element formed in an area where the gate line and the data line cross each other; A passivation film formed over the substrate and protecting the switching device, the passivation film including a contact hole; A first electrode connected to the switching element through the contact hole and formed of a transparent conductive material in the pixel cell region so as to overlap the common electrode on the passivation layer; And an ink layer including a second electrode to which a predetermined voltage is applied and a plurality of charged particles having a charge on the first electrode.

The common electrode may be formed of a transparent conductive material including ITO or IZO.

In this case, the electrophoretic display device displays an image on a front display part by moving the charged particles, and transmits an image on the rear display part by the first electrode, the second electrode, and the common electrode formed of a transparent conductive material. It is done.

According to an aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, the method including: forming a common electrode of a transparent conductive material on a substrate; Forming a common line on the substrate, the common line being parallel to the gate line and the gate line with a gate metal material, and connected to the common electrode; Forming a gate insulating film insulating the gate line and the common line in front of the substrate; Forming a semiconductor layer on the gate insulating layer, the semiconductor layer protruding from the gate line; Forming a data line to intersect the gate line and the source / drain electrode partially overlapping the semiconductor layer; Forming a passivation film formed on an entire surface of the substrate on which the data line is formed and having a plurality of contact holes; Forming a first electrode on the passivation layer, the first electrode being connected to the drain electrode through the contact hole; And forming an ink layer including a second electrode to which a predetermined voltage is applied and a plurality of charged particles having charges on the first electrode.

Hereinafter, with reference to the drawings of the electrophoretic display device according to the present invention will be described in detail. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like numbers refer to like elements throughout.

The present invention describes a display device constituting electronic paper by electrophoresis according to an embodiment.

3A and 3B are views for explaining a driver layer of an electrophoretic display device according to the present invention, and FIG. 4 is a view showing an ink layer of the electrophoretic display device according to the present invention. 3A is a plan view of an electrophoretic display device according to the present invention, and FIG. 3B is a cross-sectional view taken along line II-II 'of FIG. 3A.

Referring to FIGS. 3A and 3B, the electrophoretic display device 1 according to the present invention includes an ink layer (3 in FIG. 4) and the charged particles having a plurality of charged particles (110 in FIG. 4). The driver layer 5 which can drive 110 is provided.

The driver layer 5 is provided with a substrate 10 having a plurality of pixel cells 7. The substrate 10 may be any one of glass, plastic, and stainless foil.

The gate line 30 and the data line 60 intersect each other on the substrate 10, and the pixel cell 7 is defined in an area partitioned between the gate line 30 and the data line 60.

The common cell 20 formed of a predetermined area and formed of a transparent conductive material is formed in the pixel cell 7. Here, the transparent conductive material may use ITO, IZO, or the like.

The common electrode 20 is formed in a predetermined area in the pixel cell 7 area, and the electrophoretic display device 1 has a film-like ink layer 3 on the first electrode 80 which will be described later. Since the ink layer 3 has low resistance, leakage current may be generated. That is, the charging voltage for screen maintenance of the electrophoretic display device 1 may be naturally discharged, causing the screen to flicker. Therefore, the common electrode 20 is preferably formed in a large area in the pixel cell 7 region.

The common line 35 is formed on the substrate 10 at regular intervals in a direction parallel to the gate line 30. The common line 35 is provided on the common electrode 20 formed of the transparent conductive material so that the common electrode 20 can be electrically connected to the common line 35.

The gate line 30 and the common line 35 may be simultaneously formed of a gate metal material. The common electrode 20 is connected to the second electrode 120 provided in the ink layer 3 to apply a predetermined voltage to the second electrode 120.

In addition, a gate insulating film 40 that insulates the common line 35, the common electrode 20, and the gate line 30 is formed on the entire surface of the substrate 10. Here, the gate insulating film 40 may be a silicon oxide film, a silicon nitride film, or a stacked film thereof.

Meanwhile, at least one switching device Tr is formed at an intersection area of the gate line 30 and the data line 60.

The switching element TR is formed on the gate electrode 32 formed integrally with the gate line 30. The gate electrode 32 has a shape protruding from a portion of the gate line 30.

The semiconductor layer 50 is formed on the gate insulating layer 40 corresponding to the gate electrode 32. Here, the semiconductor layer 50 may be formed of a channel layer and an ohmic contact layer formed by sequentially stacking amorphous silicon and amorphous silicon doped with impurities, and forming the semiconductor layer 50 using an organic material. A flexible display device may be formed.

Source / drain electrodes 60a and 60b are formed at both ends of the semiconductor layer 50, respectively. The source electrode 60a has a shape in which a portion of the data line 60 is protruded and is integrated with the data line 60. The drain electrode 60b is formed to be spaced apart by a predetermined interval with the semiconductor layer 50 interposed therebetween.

The passivation layer 70 is formed on the gate insulating layer 40 on which the switching element Tr and the data line 60 are formed. Here, the passivation film 70 may be made of BCB, acrylic resin or silicone resin. In this case, the passivation layer 70 is provided with a contact hole 75 exposing a portion of the drain electrode 60b.

The first electrode 80 is formed on the passivation film 70. The first electrode 80 may drive the charged particles 110 provided in the ink layer 3. The first electrode 80 is electrically connected to the drain electrode 60b through the contact hole 75.

The first electrode 80 may be formed to overlap the pixel cell 7 region, the gate line 30, and the predetermined region of the data line 60.

As such, the first electrode 80 is formed to overlap the gate line 30, the data line 60, the common electrode 20, and the common line 35. As a result, since the area of the first electrode 80 overlapping the common electrode 20 and the common line 35 is large, the capacitance of the driver layer 5 is large. That is, it is possible to secure the charging voltage for maintaining the display screen of the electrophoretic display device (1).

In this case, the first electrode 80 is formed up to the gate line 30 and the data line 60. This may occur when the charged particles 110 included in the ink layer 3 react by the voltage applied to the gate line 30 and the data line 60. Accordingly, since the charging particle 110 may not be controlled, the first electrode 80 may be formed up to the gate line 30 and the data line 60.

As such, the driver layer 5 includes a switching element TR capable of switching the first electrode 80 and a common electrode 20 capable of forming a charging voltage for maintaining the screen. Form in the area.

Accordingly, the common electrode 20 is formed of a transparent conductive material including ITO and IZO in the pixel cell 7 region, thereby forming a transparent driver layer 5 through which light can pass.

As shown in FIG. 4, the driver layer 5 of the electrophoretic display device 1 includes a switching element Tr and a first electrode 80 connected to the switching element TR. .

The ink layer 3 is provided on the first electrode 80. The ink layer 3 includes a plurality of charged particles 110 having charges and a second electrode 120.

The charged particles 110 are provided in a capsule containing a transparent liquid. Here, the charged particles 110 are particles that respond to negative charges and positive charges, and the charged particles 110 include black particles that absorb light and white particles that reflect light. In this case, the black particles may be charged with a negative charge, and the white particles may be charged with a positive charge.

The charged particles 110 are driven by a voltage applied to the first electrode 80. Here, the second electrode 120 is connected to the common line 35 provided in the driver layer 5 to apply a constant voltage, and the first electrode 80 has a voltage and a variable voltage switched by a switching element. Is approved. The charged particles 110 having positive and negative charges are moved toward the first electrode 80 and the second electrode 120 by the applied variable voltage and the constant voltage.

That is, when a positive voltage is applied to the first electrode 80, the second electrode 120 has a relatively negative potential. As a result, the negatively charged black particles move to the first electrode 80, while the positively charged white particles move to the second electrode 120. As a result, when external light is irradiated to the electrophoretic display device 1, external light incident by the white particles is reflected to implement white.

On the contrary, when a negative voltage is applied to the first electrode 80, the second electrode 120 has a relatively positive potential. As a result, the black particles charged with the negative charge move to the second electrode 120, while the white particles charged with the positive charge move to the first electrode 80. As a result, when external light is irradiated to the electrophoretic display device 1, external light incident by the black particles is absorbed to implement black.

As described above, the electrophoretic display device 1 includes the charged particles 110 included in the ink layer 3 by an electric field generated between the first electrode 80 and the second electrode 120. The image can be displayed by moving.

However, since the common electrode 20 serving as a capacitor is formed of a transparent conductive material such as ITO and IZO in the driver layer 5 of the electrophoretic display device 1 of the present invention, the driver layer 5 is transparent. Formed.

That is, the electrophoretic display device 1 displaying an image by the movement of the charged particles 110 may display the image in both directions due to the color of the charged particles 110.

5A is a view showing a front display of the electrophoretic display according to the present invention, and FIG. 5B is a view showing a rear display of the electrophoretic display according to the present invention.

As shown in FIGS. 5A and 5B, since the common electrode 20 serving as a capacitor of the electrophoretic display device 1 is formed of a transparent conductive material such as ITO or IZO, the driver layer 5 is formed. It is formed transparent. Therefore, an image may be displayed on the rear surface of the electrophoretic display device 1.

Referring to FIG. 5A, when the black particles are moved toward the first electrode 80 by the front portion of the electrophoretic display device 1, the background becomes black, and the white particles having a relative charge are the second electrodes. The image may be displayed on the front display part in white while being moved in the direction of 120.

As shown in FIG. 5B, the electrophoretic display 1 displays an image on the rear surface of the electrophoretic display 1 because the common electrode 20 formed in the pixel cell 7 is a transparent conductive material. Becomes possible.

That is, an image may be displayed on the back of the electrophoretic display 1 as black particles on the white background as opposed to the front display. As such, the electrophoretic display 1 may display images on both sides without increasing the power consumption of the electrophoretic display 1.

6A through 6D are process diagrams for forming a driver layer of the electrophoretic display device according to the present invention. 6A to 6D show a plan view and a cross sectional view, wherein the cross section is a cross-sectional view taken along line III-III 'of the plan view.

As shown in FIG. 6A, the substrate 10 is prepared and a transparent conductive material is deposited on the substrate 10. The common electrode 20 is formed in the pixel cell 7 region by patterning the transparent conductive material. In this case, the common electrode 20 preferably occupies a predetermined area in order to maintain the screen holding charge voltage in the pixel cell 7 region in order to form a large capacitance.

The common electrode 20 may be formed of a transparent conductive material to transparently form the driver layer 5 of the electrophoretic display device 1. That is, the electrophoretic display device 1 can display an image in both directions.

As shown in FIG. 6B, a gate metal material is deposited on the common electrode 20 and patterned on the gate metal material to form a gate line 30 and a common line 35.

The gate line 30 is provided with a gate electrode 32 protruding in a protrusion shape, and a switching element TR is formed in a region corresponding to the gate electrode 32 later.

The common line 35 is formed on the common electrode 20 to be electrically connected to each other. The common line 35 is formed on the common electrode 20 in a direction parallel to the gate line 30.

A gate insulating film 40 is formed on the entire surface of the substrate 10 to insulate the common electrode 20, the common line 35, and the gate line 30.

The semiconductor layer 50 is formed on the gate insulating layer 40 on the gate electrode 32 protruding from the gate electrode 32. The semiconductor layer 50 may be formed of silicon or the like, and the electrophoretic display device 1 may be flexibly formed by forming the semiconductor layer 50 with an organic material.

As shown in FIG. 6C, a data line 60 is formed on the gate insulating layer 40. The data line 60 is formed to intersect the gate line 30. A source electrode 60a integrated with the data line 60 and a drain electrode 60b spaced apart from the source electrode 60a by a predetermined distance are formed on the semiconductor layer 50. As such, the switching element Tr is formed in an area where the data line 60 and the gate line 30 cross each other.

The passivation layer 70 is formed on the substrate 10 on which the data line 60 is formed. The passivation layer 70 protects the switching element TR and protects the plurality of lines 30 and 60 connected to the switching element TR.

The passivation layer 70 is formed through the region corresponding to the drain electrode 60b to form the contact hole 75. The contact hole 75 exposes a part of the drain electrode 60b to connect the first electrode 80 formed later and the switching element TR.

As shown in FIG. 6D, the first electrode 80 is formed on the passivation layer 70 having the contact hole 75.

The first electrode 80 is preferably formed of a transparent conductive material such as ITO and IZO. The first electrode 80 is also formed on the gate line 30 and the data line 60.

Here, referring to FIG. 4, the electrophoretic display device 1 may display an image by the ink layer 3 including the plurality of charged particles 110. Here, the charged particles 110 provided in the ink layer 3 are moved according to the applied electric charge, and the charged particles 110 are applied by the voltage applied to the gate line 30 and the data line 60. In addition, the swing may occur. Accordingly, the charged particles 110 may be in a state that cannot be controlled.

Accordingly, the first electrode 80 is placed on the data line 60 and the gate line 30 so that the charged particles 110 do not feel the voltage applied to the gate line 30 and the data line 60. It is preferable to form and shield.

In this manner, the common electrode 20 is formed of a transparent conductive material on the driver layer 5 of the electrophoretic display device 1 to provide sufficient capacitance between the common electrode 20 and the first electrode 80. It is possible to maintain the screen maintenance charge voltage of the electrophoretic display (1). In addition, the common electrode 20 formed of the transparent conductive material may display an image on the screen even from the rear surface of the electrophoretic display device 1. That is, the image can be viewed from the rear surface of the electrophoretic display device 1.

As a result, the electrophoretic display 1 can be displayed on both sides without providing additional power for displaying on both sides, and a display device having excellent viewing angle and visibility can be provided with low power consumption.

Therefore, the electrophoretic display device 1 according to the present invention can display an image on both sides with one display device. This enables a public display function that can be used by public places or by multiple users.

As described above, the electrophoretic display device according to the present invention forms a common electrode used as a capacitor with a transparent conductive material so that the display can be displayed on both sides without providing additional power for displaying on both sides, and the polarized light Since no image is displayed, a display device having excellent viewing angle and visibility with low power consumption can be provided.

In addition, the electrophoretic display device can display an image on both sides with one display device, and thus has an effect of providing a public display function that can be used by a public place or by a plurality of users.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that.

Claims (16)

A substrate having a plurality of pixel cells defined by a plurality of gate lines and a plurality of data lines; A common electrode formed in each of the plurality of pixel cells and formed of a transparent conductive material on the substrate and serving as a capacitor; A common line formed in a direction parallel to the gate line and directly contacting an upper surface of the common electrode; A switching element formed in an area where the gate line and the data line cross each other; A passivation film formed over the substrate and protecting the switching device, the passivation film including a contact hole; A first electrode connected to the switching element through the contact hole and formed of a transparent conductive material in the pixel cell region so as to overlap the common electrode on the passivation layer; An ink layer having a plurality of charged particles having charges on the first electrode and a second electrode corresponding to the first electrode and to which a constant voltage is applied with the ink layer interposed between the first electrode; Including, And the second electrode is connected to the common line. The method of claim 1, The switching element A gate insulating film insulating the gate line on the entire surface of the substrate; A semiconductor layer formed on the gate insulating layer and formed in a region corresponding to the gate electrode protruding from the gate line; And a drain electrode partially overlapping the semiconductor layer and spaced apart from the source electrode integral with the data line by a predetermined distance. 3. The method of claim 2, And the contact hole partially exposes the drain electrode. delete delete 3. The method of claim 2, And wherein the semiconductor layer is formed of an organic material. The method of claim 1, And the first electrode and the second electrode are made of a transparent conductive material including ITO or IZO. The method of claim 1, The common electrode is an electrophoretic display device, characterized in that formed of a transparent conductive material containing ITO or IZO. The method of claim 1, An image is displayed on the front display part by movement of the charged particles, and a transmissive image is displayed on the rear display part by the first electrode, the second electrode, and the common electrode formed of a transparent conductive material. Forming a common electrode serving as a capacitor on the substrate with a transparent conductive material; Forming a common line on the substrate, the common line being parallel to the gate line and the gate line with a gate metal material and directly contacting an upper surface of the common electrode to be connected to the common electrode; Forming a gate insulating film insulating the gate line and the common line in front of the substrate; Forming a semiconductor layer on the gate insulating layer, the semiconductor layer protruding from the gate line; Forming a data line to intersect the gate line and the source / drain electrode partially overlapping the semiconductor layer; Forming a passivation film formed on an entire surface of the substrate on which the data line is formed and having a plurality of contact holes; Forming a first electrode connected to the drain electrode through the contact hole and overlapping the common electrode on the passivation layer; An ink layer having a plurality of charged particles having charges on the first electrode and a second electrode corresponding to the first electrode and to which a constant voltage is applied with the ink layer interposed between the first electrode; Forming; And the second electrode is connected to the common line. The method of claim 10, And forming the first electrode so as to overlap the data line, the gate line, and the common electrode. delete The method of claim 10, And wherein the semiconductor layer is formed of an organic material. The method of claim 10, And the first electrode and the second electrode are made of a transparent conductive material including ITO or IZO. The method of claim 10, The electrophoretic display device of claim 1, wherein an image is displayed on the front display by moving the charged particles, and a transmissive image is displayed on the rear surface of the first electrode, the second electrode, and the common electrode formed of a transparent conductive material. Way. The method of claim 1, And the first electrode covers the gate line and the data line.

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