KR20110074257A

KR20110074257A - Electrophoretic display device and method for fabricating the same

Info

Publication number: KR20110074257A
Application number: KR1020090131169A
Authority: KR
Inventors: 권오남; 박용인
Original assignee: 엘지디스플레이 주식회사
Priority date: 2009-12-24
Filing date: 2009-12-24
Publication date: 2011-06-30

Abstract

PURPOSE: An electrophoretic display device and a method for fabricating the same are provided to increase a resolution by simultaneously operating three sub pixels. CONSTITUTION: A TFT(Thin Film Transistors) is respectively formed on each R, G, and B sub pixel areas of a lower substrate(101). A pixel electrode(119a) is connected to the TFT. Sub electrodes(119b) are formed and connected with white areas on which each R, G, and B sub pixels are formed. An electrophoretic film(150) is attached to the lower substrate. An upper substrate(141) is bonded to the electrophoresis film. A common electrode(143) is formed on the surface of the upper plate.

Description

Electrophoretic display device and its manufacturing method {ELECTROPHORETIC DISPLAY DEVICE AND METHOD FOR FABRICATING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display device (EPD), and more particularly, to an electrophoretic display device capable of improving color reflectance of a color electrophoretic display panel and a method of manufacturing the same.

In general, an electrophoretic display is an image display device using a phenomenon in which colloidal particles move to either polarity when a pair of electrodes to which a voltage is applied is immersed in a colloidal solution. A wide viewing angle, a high reflectance, and a weather without using a backlight are used. It is expected to be spotlighted as an electric paper because it has characteristics such as ease and low power consumption.

Such an electrophoretic display device has a structure in which an electrophoretic film is interposed between two substrates, and at least one of the two substrates must be transparent to display an image in a reflective mode.

When a pixel electrode is formed on the lower substrate of the two substrates, and a voltage is applied to the pixel electrode, charged particles in the electrophoretic film move to the pixel electrode side or to the opposite side, whereby the viewing sheet is moved. You can see the image through it.

Although not shown, a general electrophoretic display device has a structure in which an upper substrate and a lower substrate on which pixel electrodes are formed are disposed to face each other, and an electrophoretic film is interposed between the two substrates.

Here, the electrophoretic film is composed of a solvent (charged) containing charged pigment particles (particles), it is made into a microcapsule by a coacervation (coacervation) method, the microcapsules in a binder (binder) The mixture is formed by coating (coating) or laminating (laminating) the base film.

Here, the pigment particles may be colored in different colors, by adding a pigment of B (Black), W (White) to represent the image, the solvent and the binder is formed of a transparent material so that light can pass through do.

Since the electrophoretic film is surrounded by the microcapsule film, the pigment particles can be prevented from moving in an undesired direction by a field of adjacent pixels, thereby realizing better image quality. In this case, a partition wall may be further provided between adjacent pixels to completely block the parasitic field.

In such a general electrophoretic display, when voltage is applied to the pixel electrode, charged pigment particles are moved to an electrode having a polarity opposite to that of the polarity, and a predetermined image is generated according to reflection of light by the pigment particles. Will be displayed.

On the other hand, when moving toward the electrode having the polarity of the pigment particles, another image is displayed.

In this regard, the electrophoretic display device according to the related art will be described with reference to FIG. 1.

1 is a schematic plan view of an electrophoretic display according to the related art, in which one panel is divided into four subpixels of red (R), green (G), blue (B), and white (W) dots. It is a schematic plan view when it is comprised.

In the electrophoretic display device according to the related art, as illustrated in FIG. 1, one pixel includes four red (R), green (G), blue (B), and white subpixels. In addition, each of the red (R), green (G), and blue (B) subpixels includes red (R), green (G), and blue (B) color filters 65a, 65b, and 65c. The white subpixel does not include a color filter and is defined as a white subpixel region 65d.

Here, a thin film transistor (not shown) is provided in each of the red (R), green (G), and blue (B) sub-pixels, and a pixel electrode (not shown) is formed in the thin film transistor (not shown). Connected in the form of

In addition, the pixel electrodes (not shown) formed in each of the red (R), green (G), and blue (B) sub-pixels are red (R), green (G), and blue (B) sub-pixels. It is formed with the same area as the area.

In the electrophoretic display device having the above configuration, in the case of a color electrophoretic display device using a color filter, a panel of a quad type color filter structure in which a white subpixel is added to improve a problem in which white reflectance is lowered is applied. It was.

A method of manufacturing an electrophoretic display device according to the related art, in which a panel having a quad type color filter structure in which a white subpixel is added, will be described with reference to FIG. 2.

FIG. 2 is a schematic cross-sectional view of an electrophoretic display device according to the prior art, in which one panel is divided into four subpixels of red (R), green (G), blue (B), and white (W) dots. It is sectional drawing when comprised.

In the electrophoretic display device according to the related art, as shown in FIG. 2, a plurality of thin film transistors T are formed, and each of the thin film transistors T is connected to a lower substrate connected to the pixel electrode 29 formed in a matrix form. (11); An electrophoretic film 50 adhered to the lower substrate 11; An upper substrate 61 bonded to the electrophoretic film 50 and having a common electrode 63 formed on a surface thereof; It includes a red (R), green (G), blue (B), white (W) color filters (65a, 65b, 65c, 65d) formed on the upper substrate 61.

Here, the passivation layer 25 is formed on the entire surface of the lower substrate 11 including the thin film transistor T.

In addition, a gate wiring (not shown) for transmitting a scan signal and a data wiring (not shown) for transmitting an image data signal are formed on the lower substrate 11 to actively drive the plurality of thin film transistors T. .

In this case, the gate wiring and the data wiring cross each other to define pixels, and each pixel is provided with a thin film transistor T and a storage capacitor (not shown) to control the polarity of the voltage applied to the electrodes and to be applied to the electrodes. It serves to store voltage.

The pixel electrode 29 electrically connected to the thin film transistor T applies an electric field to the electrophoretic film 50.

In addition, the electrophoretic film 50 is composed of microcapsules 53 in which white particles 55a and black particles 55b are mixed with a solvent 51.

The red (R), green (G), and blue (B) color filters 65a, 65b, and 65c are provided on the upper substrate 61, and a color filter is provided in the white sub-pixel region. Rather, it is defined as only the white sub pixel region 65d.

In the conventional electrophoretic display device having such a configuration, when the red (R) subpixel is operated, the white (W) subpixel is operated to increase the resolution of the red (R) subpixel. In addition, when the green (G) sub-pixels operate, the white (W) sub-pixels operate together to increase the resolution of the green (G) sub-pixel. When the blue (B) subpixel is operated, the white (W) subpixel is operated together to increase the resolution of the blue (B) subpixel.

As described above, the white (W) sub-pixel is connected to the red (R), green (G), and blue (B) sub-pixel independently of each other to be driven.

However, the electrophoretic display device according to the related art has the following problems.

The electrophoretic display device according to the related art uses a panel of a quad type color filter structure in which a white subpixel is added to improve a problem in which a white reflectance is reduced in a color electrophoretic display device using a color filter. However, since one dot constitutes four dots, the red (R), the green (G), the blue (B), and the white dot, there is a problem that the resolution is lowered.

Accordingly, the electrophoretic display device according to the prior art exhibits a decrease in reflectance because the color filter is used to produce a color electrophoretic display device (color EPD), and a white dot is added to improve the resolution. Cause will arise.

Accordingly, an object of the present invention is to provide an electrophoretic display device and a method of manufacturing the same, which can increase the reflectance without degrading the resolution.

In accordance with one aspect of the present invention, an electrophoretic display device includes: a thin film transistor formed on each of red (R), green (G), and blue (B) sub-pixel regions of a lower substrate; A pixel electrode connected to the thin film transistor; Auxiliary electrodes formed on the white regions of each of the red, green, and blue sub-pixel regions of the lower substrate and connected to each other; An electrophoretic film adhered to the lower substrate; An upper substrate bonded to the electrophoretic film and having a common electrode formed on a surface thereof; And a red (R), green (G), and blue (B) color filter formed on an upper substrate corresponding to the pixel electrode.

In accordance with another aspect of the present invention, a method of manufacturing an electrophoretic display device includes: forming thin film transistors on a red (R), green (G), and blue (B) sub-pixel region of a lower substrate; Forming a pixel electrode connected to each of the thin film transistors; Forming auxiliary electrodes on the white regions of each of the red, green, and blue sub-pixel regions of the lower substrate and connecting the auxiliary electrodes; Adhering an electrophoretic film on the lower substrate; Adhering an upper substrate having a common electrode formed on a surface thereof with the electrophoretic film; And forming a red (R), green (G), and blue (B) color filter on an upper substrate corresponding to the pixel electrode.

According to the electrophoretic display device and the manufacturing method thereof according to the present invention has the following advantages.

In the method of manufacturing an electrophoretic display device according to the present invention, three red, green, and blue subpixels are formed in one pixel, and white auxiliary regions are formed in each of the red, green, and blue subpixels. By connecting the white auxiliary regions to each other so that each subpixel operates at the same time, it is possible to improve the reflectance of the white color of the panel with increasing resolution. That is, in the past, one white subpixel was operated when one subpixel was operated. However, in the present invention, since three subpixels are simultaneously operated when one subpixel is operated, the resolution increases.

Accordingly, the method of manufacturing an electrophoretic display device according to the present invention comprises three red, green, and blue subpixels in one pixel, and forms a white auxiliary region in each of the red, green, and blue subpixels. By connecting them together, these white sub-regions are driven simultaneously during each sub-pixel operation, thereby dramatically improving the reflectance, which is a weakness of the characteristics of the existing color EPD panel, without using a separate white sub-pixel. have.

In addition, the method of manufacturing an electrophoretic display device according to the present invention reduces the size of one sub-pixel to four sub-pixels, and each of the three sub-pixels has an area of each existing sub-pixel. As a result, the entire area of one pixel is reduced compared to the conventional one, so that the number of pixels arranged in the entire panel is increased so that the resolution is higher than the conventional one.

Hereinafter, an electrophoretic display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic plan view of an electrophoretic display device according to the present invention, in which one panel is composed of three subpixels of red (R), green (G), and blue (B) dots. It is a schematic top view in the case of providing a white area | region.

In the electrophoretic display device according to the present invention, as illustrated in FIG. 3, one pixel includes three red (R), green (G), and blue (B) subpixels, and the red (R) ), Each of the green (G) and blue (B) subpixels has a white area.

In addition, the white regions provided in each of the red (R), green (G), and blue (B) subpixels are connected to each other through a connection line 120.

The three red (R), green (G), and blue (B) subpixels are provided with red (R), green (G), and blue (B) color filters 145R, 145G, and 145B. The white area provided in each of the sub pixels is not provided with a color filter, and is defined as a white sub pixel area.

In addition, each of the red (R), green (G), and blue (B) subpixels is provided with a thin film transistor (not shown), and the thin film transistor (not shown) has a pixel electrode (not shown) in a matrix form. Is connected.

In addition, a pixel electrode (not shown) formed in each of the red (R), green (G), and blue (B) subpixels has an area of the red (R), green (G), and blue (B) subpixels. The same area as is formed.

In addition, a separate thin film transistor (not shown) is not formed in the white region provided in each of the sub pixels, and an auxiliary electrode (not shown; 119b of FIG. 4) is formed. In this case, the auxiliary electrodes provided in each of the white regions are connected to each other by the connection line 120, so that the entirety of one line (that is, the white regions provided in each sub-color pixel) is converted into a single gray. It is linked and driven simultaneously.

Accordingly, the electrophoretic display according to the present invention reduces the size of one sub-pixel to four sub-pixels, each of which is equal to the area of each existing sub-pixel. As a result, the total area of one pixel is reduced as compared with the existing one, and thus the number of pixels arranged in the entire panel is increased so that the resolution is higher than the conventional one.

Referring to FIG. 4, an electrophoretic display device according to an exemplary embodiment of the present invention having three subpixels composed of one pixel and having a white area in each subpixel is described below.

4 is a schematic cross-sectional view of an electrophoretic display device according to an exemplary embodiment of the present invention, in which one panel is composed of three subpixels of red (R), green (G), and blue (B) dots. .

An electrophoretic display device according to the present invention, as shown in Figure 4, the thin film transistor (T) formed on the red, green, blue sub-pixel region of the lower substrate 101, respectively; A pixel electrode 119a connected to the thin film transistor T; An auxiliary electrode 119b formed in a white region of each of the red, green, and blue sub-pixel regions of the lower substrate 101 and interconnected with each other; An electrophoretic film 150 adhered to the lower substrate 101; An upper substrate 141 bonded to the electrophoretic film 150 and having a common electrode 143 formed on a surface thereof; And red (R), green (G), and blue (B) color filters 145R, 145G, and 145B formed on the upper substrate 141 corresponding to the pixel electrode 119a.

Here, the passivation layer 125 is formed on the entire surface of the lower substrate 101 including the thin film transistor T.

In addition, the lower substrate 101 may be formed of a flexible material such as glass, plastic, or metal, and the common electrode 143 may be transparent, such as indium tin oxide (ITO) or indium zinc oxide (IZO). It is formed of a material. This is because the white particles 155a and the black particles 155b included in the electrophoretic film 150 move when the specific voltage is applied to the pixel electrode 119a to move the upper substrate 141. Since the image is implemented through the common electrode 143 formed on the upper substrate 141 should be made of a transparent material.

In addition, a gate wiring (not shown) for transmitting a scan signal and a data wiring (not shown) for transferring an image data signal are formed on the lower substrate 101 to actively drive the plurality of thin film transistors T. .

In addition, the passivation layer 115 further includes a pixel electrode 119a electrically connected to the thin film transistor T to apply an electric field to the electrophoretic film 150, wherein the pixel electrode 119a is disposed on the upper portion of the passivation layer 115. The red, green, and blue color filters 145R, 145G, and 145B formed on the substrate 141 are formed at respective positions. In addition, the pixel electrode 119a is formed to have the same size as that of the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B.

The auxiliary electrode 119b is adjacent to the pixel electrode 119a formed at a position corresponding to each of the three red, green, and blue color filters 145R, 145G, and 145B. The auxiliary electrode 119b is formed in a white region provided in each of the red, green, and blue sub-pixel regions of the lower substrate 101 and connected by a connection line (not shown; Are interconnected. In this case, the auxiliary electrodes 119b provided in the white regions are connected to each other by the connection line 120, and the entire one line is linked to a single gray and driven at the same time. That is, the white auxiliary regions provided in each of the red, green, and blue sub pixels are connected to each other so that the white auxiliary regions are simultaneously driven during each sub pixel operation.

In addition, although not shown in the drawing, the storage capacitor Cst includes a capacitor upper electrode overlapping the capacitor lower electrode with a capacitor lower electrode and a gate insulating layer interposed therebetween, and the thin film transistor is turned on when the image display is implemented. It maintains the voltage charged in the electrophoretic film in the off section serves to prevent the deterioration of image quality due to parasitic capacitance. In this case, the capacitor lower electrode extends to the outside of the active region to receive a signal, and the capacitor upper electrode is connected to the pixel electrode or the drain electrode to receive a signal.

A method of manufacturing an electrophoretic display device according to the present invention having the above configuration will be described with reference to FIGS. 5A to 5F.

5A to 5F are cross-sectional views illustrating a method of manufacturing an electrophoretic display device according to the present invention.

As shown in FIG. 5A, a metal film (not shown) is deposited on a lower substrate 101 made of flexible plastic or stainless foil, and then the metal film is subjected to a photolithography process and an etching process. (Not shown) is selectively patterned to form a gate wiring (not shown) and a gate electrode 103 branched from the gate wiring (not shown).

In this case, the metal film material may be selected from Al-based metals such as Al and Al alloys, Ag-based metals such as Ag and Ag alloys, and Mo-based metals such as Mo and Mo alloys, Cr, Ti, and Ta. .

In addition, they may include two films of different material properties, that is, a lower film and an upper film thereon. Here, the upper layer is made of a low resistivity metal, for example, an Al-based metal or an Ag-based metal so as to reduce signal delay or voltage drop of the gate wiring.

In contrast, the lower layer may be made of other materials, especially materials having excellent physical, chemical and electrical contact properties with indium tin oxide (ITO) or indium zinc oxide (IZO), such as Ti, Ta, Cr, Mo-based metals, or the like. Or an example of the combination of the lower layer and the upper layer is a Cr / Al-Nd alloy.

Subsequently, a gate insulating layer 105 made of an inorganic insulating material such as silicon nitride (SiNx) is formed on the lower substrate 101 including the gate wiring (not shown) and the gate electrode 103.

Next, although not shown in the drawing, a semiconductor layer (not shown) made of hydrogenated amorphous silicon (hydrogen-nated amorphous silicon) or the like and silicide or n-type impurity are doped with high concentration on the gate insulating film 105. Impurity layers (not shown) made of a material such as n + hydrogenated amorphous silicon are sequentially formed.

Subsequently, the impurity layer (not shown) and the semiconductor layer (not shown) are selectively patterned by a photolithography process and an etching process to form an active layer 107 and an ohmic contact layer 109.

Next, a metal material for forming data wirings is deposited on the lower substrate 101 including the active layer 107 and the ohmic contact layer 109 by a sputtering method, and then selectively patterned by a photolithography process and an etching process. The data wirings (not shown), the source electrodes 111 branched from the data wirings (not shown), and the drain electrodes 113 spaced apart from the source electrodes 111 and the channel regions are formed, respectively.

In this case, the metal material may be formed of an Al-based metal, an Ag-based metal, a Mo-based metal, Cr, Ti, Ta, or the like, or may be formed of multiple layers.

The data line (not shown) is formed to cross the gate line (not shown), and the source electrode 111 and the drain electrode 113 are formed under the active layer 107 and the gate electrode (not shown). Together with 103, a thin film transistor T, which is a switching element, is configured.

Although not shown in the figure, a channel of the thin film transistor T is formed in the active layer 107 between the source electrode 111 and the drain electrode 113.

Subsequently, a passivation layer 115 is formed on the entire surface of the lower substrate 101 including the data line (not shown) and the source / drain electrodes 111 and 113. In this case, the protective film 115 is formed of an inorganic insulating material or an organic insulating material such as a silicon nitride film (SiNx) or a silicon oxide film (SiO ₂ ) for the planarization process.

In addition, the protective film 115 may be applied to a single structure composed of an organic insulator or various structures such as an inorganic / organic insulator and an inorganic / organic / inorganic insulator.

Next, the passivation layer 115 is selectively patterned through a photolithography process and an etching process to form a drain contact hole 117 exposing a portion of the drain electrode 113 of the thin film transistor T.

Subsequently, as shown in FIG. 5B, the metal material layer 119 made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the passivation layer 115 including the drain contact hole 117. ) Is deposited by the sputtering method.

Next, as shown in FIG. 5C, the metal material layer 119 is selectively removed by a photolithography process and an etching process to assist the pixel electrode 119a electrically connected to the drain electrode 113. The electrode 119b is formed. In this case, the pixel electrode 119a is formed at each position corresponding to the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B formed on the upper substrate 141. In addition, the pixel electrode 119a is formed to have the same size as that of the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B.

The auxiliary electrode 119b is adjacent to the pixel electrode 119a formed at a position corresponding to each of the three red, green, and blue color filters 145R, 145G, and 145B. The auxiliary electrode 119b is formed in a white region provided in each of the red, green, and blue sub-pixel regions of the lower substrate 101 and connected by a connection line (not shown; Are interconnected. In this case, the auxiliary electrodes 119b provided in the white areas are connected to each other by the connection line 120 to configure the entire one line to be linked to a single gray. That is, white auxiliary regions are formed in each of the red, green, and blue subpixels, and the white auxiliary regions are connected to each other so that these white auxiliary regions are simultaneously driven during each subpixel operation.

Subsequently, as shown in FIG. 5D, a common electrode 143 formed of a transparent material is formed on the polyester substrate 141, and the electrophoretic film 150 is laminated thereon. In this case, the electrophoretic film 150 is composed of a microcapsule 153 formed of electrophoretic particles (not shown) and a solvent 151, and a binder (not shown). In this case, the common electrode 143 may be made of a conductive material having durability and corrosion resistance to an external environment, for example, indium tin oxide (ITO) or indium zinc oxide (IZO).

In addition, the electrophoretic particles are composed of white particles 155a reflecting light and black particles 155b absorbing light. In this case, the white particles 155a may be charged with a positive charge, and the black particles 155b may be charged with a negative charge.

Then, as shown in Figure 5e, the electrophoretic film 150 is bonded to the upper substrate, that is, PET substrate 141 is bonded to the lower substrate 101 by an adhesive (not shown). .

Subsequently, as shown in FIG. 5F, the electrophoretic display device is formed by sequentially forming the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B on the PET substrate 141. Complete the manufacture. In this case, the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B formed on the upper substrate 141 are pixel electrodes 119a formed on the lower substrate 101. It is formed in the position corresponding to each. In addition, the red (R), green (G), and blue (B) color filters 145R, 145G, and 145B have the same size as the area of the pixel electrode 119a.

In addition, the three red (R), green (G), and blue (B) color filters 145R, 145G, and 145B are PET substrates 141 corresponding to the auxiliary electrodes 119b formed on the lower substrate 101. ) It is not formed at the top. That is, the three red (R), green (G), and blue (B) color filters 145R, 145G, and 145B are formed in each of the three sub pixel regions except for the white region.

In this way, when a negative voltage is applied to the pixel electrode 119a, the common electrode 143 of the PET substrate 141 has a relatively positive potential. As a result, the negatively charged black particles 155b move to the common electrode 143, while the positively charged white particles 155a move to the pixel electrode 119a. Thus, when external light is irradiated to the electrophoretic display, external light incident by the black particles 155b is absorbed to implement black.

On the contrary, when a positive voltage is applied to the pixel electrode 119a provided in each pixel area, the common electrode 143 of the PET substrate 141 has a relatively negative potential. As a result, the negatively charged black particles 155b move to the pixel electrode 119a, while the positively charged white particles 155a move to the common electrode 143 of the PET substrate 141. do. Therefore, when external light is irradiated to the electrophoretic display, the external light incident by the white particles 155a is reflected to implement color.

As described above, the electrophoretic display device manufacturing method according to the present invention comprises three red, green, and blue subpixels in one pixel, and forms a white auxiliary region in each of the red, green, and blue subpixels. By connecting the white auxiliary regions provided in each sub-pack cell to each other and simultaneously operating each sub-pixel, the reflectance of the white color of the panel can be improved while increasing the resolution. That is, in the past, one white subpixel was operated when one subpixel was operated. However, in the present invention, since three subpixels are simultaneously operated when one subpixel is operated, the resolution increases.

In addition, the method of manufacturing an electrophoretic display device according to the present invention reduces the size of one sub-pixel to four sub-pixels, and each of the three sub-pixels has an area of each existing sub-pixel. As a result, the entire area of one pixel is reduced compared to the existing one, and thus, the number of pixels arranged in the entire panel increases, thereby increasing the resolution.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Accordingly, the scope of the present invention is not limited thereto, but various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims are also within the scope of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

101: lower substrate # 103: gate electrode

105: gate insulating film # 107: active layer

109: ohmic contact layer 111: source electrode

113: drain electrode # 115: protective film

117: drain contact hole a: pixel electrode

119b: auxiliary electrode 120: connection line

141: PET substrate 143: common electrode

145R: Red Color Filter 145G: Green Color Filter

145B: blue color filter 150: electrophoretic film

151; Solvent 153: Microcapsules

155a: White Particles 155b: Black Particles

Claims

A thin film transistor formed on each of the red (R), green (G), and blue (B) sub-pixel regions of the lower substrate;

A pixel electrode connected to the thin film transistor;

Auxiliary electrodes formed on the white regions of each of the red, green, and blue sub-pixel regions of the lower substrate and connected to each other;

An electrophoretic film adhered to the lower substrate;

An upper substrate bonded to the electrophoretic film and having a common electrode formed on a surface thereof; And

And a red (R), green (G), and blue (B) color filter formed on an upper substrate corresponding to the pixel electrode.

The electrophoretic display of claim 1, wherein the pixel electrode and the auxiliary electrode are formed at the same time.

2. The electrophoretic display of claim 1, wherein the auxiliary electrodes formed on the white regions provided in the red (R), green (G), and blue (B) sub-pixel regions are interconnected by connection lines.

The electrophoretic display of claim 1, wherein the red, green, and blue color filters have the same size as the area of the pixel electrode.

The electrophoretic display of claim 1, wherein the auxiliary electrode is formed separately from the pixel electrode.

2. The auxiliary electrodes of claim 1, wherein the auxiliary electrodes provided in the white regions provided in the red (R), green (G), and blue (B) sub-pixels are connected to each other. Electrophoretic display device characterized in that the electrodes are driven at the same time.

2. The electrophoretic display device according to claim 1, wherein a pixel having the red (R), green (G), and blue (B) sub-pixels is defined, and a white region is provided in each of the sub-pixels.

Forming thin film transistors on the red (R), green (G), and blue (B) sub-pixel regions of the lower substrate, respectively;

Forming a pixel electrode connected to each of the thin film transistors;

Forming auxiliary electrodes on the white regions of each of the red, green, and blue sub-pixel regions of the lower substrate and connecting the auxiliary electrodes;

Adhering an electrophoretic film on the lower substrate;

Adhering an upper substrate having a common electrode formed on a surface thereof with the electrophoretic film; And

And forming a red (R), green (G), and blue (B) color filter on an upper substrate corresponding to the pixel electrode.

The method of claim 8, wherein the pixel electrode and the auxiliary electrode are formed at the same time.

10. The auxiliary electrodes of claim 8, wherein the auxiliary electrodes provided in the white regions provided in the red (R), green (G), and blue (B) sub-pixels are connected to each other. Electrophoretic display device manufacturing method characterized in that the electrodes are driven at the same time.

10. The method of claim 8, wherein the red, green, and blue color filters have the same size as the area of the pixel electrode.

The method of claim 8, wherein the auxiliary electrode is formed to be separated from the pixel electrode.

The method of claim 8, wherein the red (R), green (G), and blue (B) sub-pixels are defined, and a white region is provided in each of the sub-pixels.