WO2009075419A1

WO2009075419A1 - Electrophoresis display and method of forming the same

Info

Publication number: WO2009075419A1
Application number: PCT/KR2008/002641
Authority: WO
Inventors: Chul-Am Kim; Seung-Youl Kang; Kyung-Soo Suh; Ji-Young Oh; Seong-Deok Ahn
Original assignee: Electronics And Telecommunications Research Institute
Priority date: 2007-12-12
Filing date: 2008-05-09
Publication date: 2009-06-18
Also published as: KR20090061869A

Abstract

Provided are an electrophoresis display and a method of forming the same. In the method, first electrodes are formed on a substrate. Partition walls are formed on the substrate. The partition walls define particle regions on the first electrodes. A dispersion liquid including charged particles is provided into the particle regions. A second electrode is formed on the particle regions. The charged particles can include color particles representing a plurality of colors.

Description

ELECTROPHORESIS DISPLAY AND METHOD OF FORMING

THE SAME

Technical Field

[1] The present invention disclosed herein relates to a display, and more particularly, to an electrophoresis display and a method of forming the same. Background Art

[2] The present invention has been derived from research undertaken as a part of IT R &

D program of the Ministry of Information and Communication and Institution of Information Technology Association (MIC/IITA) [2005-S-070-03], integrated development of flexible display.

[3] An electrophoresis phenomenon means a phenomenon that charged particles move electrostatically under an electric filed applied thereto. An electrophoresis display using the electrophoresis phenomenon maintains image information even when power is cut off, has low power consumption, and can be realized on various substrates including a flexible plastic substrate of a slim profile. The electrophoresis display can be applied to a variety of information display media such as an e-newspaper, an e- magazine, an e-book, a cellular phone, and a personal digital assistant (PDA).

[4] Since charged particles dispersed within predetermined regions corresponding to pixels move under an electric filed applied to the regions to realize an image in the electrophoresis display, it is important to uniformly arrange the charged particles on the regions. Particularly, color particles representing different colors need to be uniformly arranged in the regions, respectively, to realize a natural color image, but there is much difficulty in an aspect of process. Disclosure of Invention Technical Problem

[5] Embodiments of the present invention provide an electrophoresis display including color particles representing a plurality of colors, and a method of forming the same.

[6] Embodiments of the present invention provide an electrophoresis display that have pixels in which the color particles can disposed uniformly and respectively to realize a high quality natural color image, and a method of forming the same.

[7] Embodiments of the present invention provide a method of forming an electrophoresis display that can realize a natural color image through a simple process. Technical Solution

[8] Embodiments of the present invention provide methods of forming an electrophoresis display, the methods comprising: forming a first electrode on a substrate; forming partition walls on the substrate, the partition walls defining particle regions on the first electrodes; providing a dispersion liquid including charged particles to the particle regions, the charged particles including color particles representing a plurality of colors; and forming a second electrode on the particle regions.

[9] In some embodiments, providing the dispersion liquid includes arranging a plurality of sprayers including the dispersion liquid on the particle regions; and moving the sprayers in a predetermined direction, each of the sprayers including color particles representing different colors, respectively, and the dispersion liquid is injected from the sprayers to the particle regions during the moving.

[10] In other embodiments, the sprayers are connected to each other and move in the same speed and direction.

[11] In still other embodiments, the sprayers inject a uniform amount of the dispersion liquid into the particle regions.

[12] In even other embodiments, the methods further include removing a dispersion medium included in the dispersion liquid after providing the dispersion liquid.

[13] In yet other embodiments, the dispersion medium is a nonpolar solvent having high volatility.

[14] In further embodiments, the methods further include forming a first protection layer on an upper surface of the first electrodes and forming a second protection layer on a lower surface of the second electrode.

[15] In still further embodiments, forming the first electrode includes sequentially forming a conductive layer and a protection layer on the substrate, and patterning the conductive layer and the protection layer to form conductive patterns and protection patterns arranged in a first direction and a second direction crossing each other.

[16] In other embodiments of the present invention, electrophoresis displays comprise a first electrode on a substrate; partition walls on the substrate, the partition walls defining particle regions on the first electrode; charged particles injected in the particle regions by a substantially uniform amount, the charged particles including color particles representing a plurality of colors; and a second electrode on the particle regions.

[17] In some embodiments, the particle regions are arranged in a first direction and a second direction crossing each other, color particles representing the same color are disposed in the particle regions arranged in the first direction, and color particles representing different colors are alternately disposed in the particle regions arranged in the second direction.

[18] In other embodiments, the first electrode comprises conductive patterns to which independent signal voltages are provided, respectively, the conductive patterns corresponding to the particle regions. [19] In still other embodiments, the partition walls are disposed to correspond to regions between the conductive patterns. [20] In even other embodiments, lower portions of the partition walls fill the regions between the conductive patterns. [21] In yet other embodiments, the electrophoresis displays further include a protection layer between the first electrode and the particle regions; and a second protection layer between the second electrode and the particle regions.

Advantageous Effects

[22] According to embodiments of the present invention, color particles representing different colors and background particles can be uniformly disposed in pixels using a liquid spraying method using a dispersion medium. With this method, an electrophoresis display that can display a high quality natural color image can be realized through a simple process. Brief Description of the Drawings

[23] The accompanying figures are included to provide a further understanding of the present invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain principles of the present invention. In the figures:

[24] FIGS. 1 and 2 are plan views of an electrophoresis display according to an embodiment of the present invention;

[25] FIG. 3 is a cross-sectional view taken along the line I-F of FIG. 1, explaining an electrophoresis display according to an embodiment of the present invention;

[26] FIG. 4 is a cross-sectional view taken along the line I-F of FIG. 1, explaining an electrophoresis display according to another embodiment of the present invention;

[27] FIGS. 5 through 7 are cross-sectional views taken along the line I-F of FIG. 1, explaining the operation of an electrophoresis display according to an embodiment of the present invention;

[28] FIGS. 8 through 13 are cross-sectional views taken along the line I-F of FIG. 1, explaining a method for forming the electrophoresis display illustrated in FIG. 3;

[29] FIGS. 14 through 16 are cross-sectional views taken along the line I-F of FIG. 1, explaining a method for forming the electrophoresis display illustrated in FIG. 4; and

[30] FIG. 17 is a plan view explaining a method of forming an electrophoresis display according to an embodiment of the present invention. Best Mode for Carrying Out the Invention

[31] Preferred embodiments of the present invention will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[32] It will be understood that although the terms first and second are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. It will also be understood that when a layer (or film) is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In the figures, the dimensions of elements and a relative size between elements are exaggerated for clarity of illustration. Also, the shapes of the elements illustrated in the drawings may change more or less due to changes in a forming process. Therefore, the embodiments disclosed in the specification should not be limited to the shape illustrated in the drawings unless they are particularly mentioned otherwise, and should be understood to include modifications to some extent. For example, a term 'substantially' or 'about' used for describing the shape of an element in the specification should be understood to indicate that an element has a shape including allowed modifications in a process.

[33] Hereinafter, an exemplary embodiment of the present invention will be described with the accompanying drawings.

[34] FIGS. 1 and 2 are plan views of an electrophoresis display according to an embodiment of the present invention.

[35] Referring to FIG. 1, the electrophoresis display 10 includes main pixels 50 arranged in a first direction DA and a second direction DB. The main pixel 50 can include subpixels 51, 52, and 53 representing different colors. For example, the subpixels 51, 52, and 53 can include a red pixel, a green pixel, and a blue pixel, or include a yellow pixel, a cyan pixel, and a magenta pixel. Besides this, the subpixels 51, 52, and 53 can include various combinations of three different pixels representing different colors.

[36] The subpixels 51, 52, and 53 can be arranged in the first direction DA and the second direction DB. Subpixels 51, 52, and 53 representing different colors can be alternately arranged in the first direction DA, and subpixels 51, 52, and 53 representing the same colors can be arranged in the second direction DB.

[37] Referring to FIG. 2, the main pixel 50 of the electrophoresis display 10 can include subpixels 51, 52, 53, and 54 representing different colors. For example, the subpixels 51, 52, 53, and 54 can include a yellow pixel, a cyan pixel, a magenta pixel, and a blue pixel. Besides this, the subpixels 51, 52, 53, and 54 can include various combinations of four different pixels representing different colors.

[38] An electrophoresis display according to an embodiment of the present invention is described with reference to FIGS. 1 and 3. The electrophoresis display 10 can include a first substrate 110. For example, the first substrate 110 can be a plastic substrate or a glass substrate. Alternatively, the first substrate 110 can be a thin film type flexible substrate and/or a transparent substrate.

[39] A first electrode 120 is located on the first substrate 110. The first electrode 120 can include a plurality of electrodes 121, 122, and 123 arranged in the first direction DA and the second direction DB. The electrodes 121, 122, and 123 can one-to-one correspond to the subpixels 151, 152, and 153, respectively. Independent signal voltages can be provided to the electrodes 121, 122, and 123, respectively. For example, the first electrode 120 can include a conductive material such as a metal and a metal oxide. Alternatively, the first electrode 120 can be a transparent electrode.

[40] A protection patterns 135 are on the electrodes 121, 122, and 123 of the first electrode 120. The protection patterns 135 can include a dielectric material. The protection patterns 135 can have the substantially same width as the electrodes 121,

122, and 123 of the first electrode 120. The protection patterns 135 can protect the first electrode 120 and prevent charged particles 151, 152, 153, and 155 from attaching on the first electrode 120.

[41] Partition walls 140 are on the substrate 110 between the electrodes 121, 122, and 123 arranged in the first and second directions DA and DB. The lower portions of the partition walls fill regions between the electrodes 121, 122, and 123. The upper portions of the partition walls 140 protrude above the protection pattern 135. The partition walls 140 can be aligned in the regions between the electrodes 121, 122, and

123. The upper surface of the partition wall 140 is higher than that of the protection pattern 135. Particle regions 145 are defined on the protection patterns 135 by the partition walls 140.

[42] The charged particles 151, 152, 153, and 155 are disposed in the particle regions 145.

For example, the charged particles 151, 152, 153, and 155 can include inorganic oxidation particles or polymer particles. The charged particles 151, 152, 153, and 155 can include positively charged particles 151, 152, and 153, and negatively charged particles 155. Also, the charged particles can include color particles 151, 152, and 153, and background particles 155. The color particles 151, 152, and 153 can display different colors. The color particles 151, 152, and 153, for example, can include a red particle, a green particle, and a blue particle, or include a yellow particle, a cyan particle, and a magenta particle. The background particles, for example, can include white particles. In the present embodiment, the color particles 151, 152, and 153 are charged positively and the background particles 155 are charged negatively, but in other embodiments of the present invention, the color particles 151, 152, and 153 may be charged negatively and the background particles 155 may be charged positively.

[43] The color particles 151, 152, and 153 can be disposed to correspond to the subpixels 51, 52, and 53. For example, the color particles 151 can be disposed in the subpixel 51, the color particles 152 can be disposed in the subpixel 52, and the color particles 153 can be disposed in the subpixel 53. The background particles 155 can be disposed in all the subpixels 51, 52, and 53 regardless of the division of the subpixels 51, 52, and 53. A substantially uniform amount of the color particles 151, 152, and 153, and the background particles 155 can be disposed in the subpixels 51, 52, and 53, respectively. Particle regions 145 in which the color particles 151, 152, and 153, and the background particles 155 are disposed can be maintained as a vacuum state.

[44] In the case where the main pixel includes four subpixels as illustrated in FIG. 2, the color particles can include particles displaying four different colors, for example, a yellow particle, a cyan particle, a magenta particle, and a blue particle.

[45] The protection layer 160 is on the partition wall 140 and the particle regions 145. The second electrode 170 is on the protection layer 160. The protection layer 160 and the second electrode 170 can cover the entire region of the display including the main pixel 50. That is, the second electrode 170 can serve as a common electrode providing the same signal voltage to the subpixels 51, 52, and 53. For example, the second electrode 170 can include a conductive material such as a metal and a metal oxide. Also, the second electrode 170 can be a transparent electrode. The protection layer 160 can include a dielectric material. The protection layer 160 can protect the second electrode 170 and prevent charged particles 151, 152, 153, and 155 from attaching on the second electrode 170.

[46] A second substrate 180 is on the second electrode 170. For example, the second substrate 180 can be a plastic substrate or a glass substrate. Alternatively, the second substrate 180 can be a thin film type flexible substrate and/or a transparent substrate.

[47] The particle regions 145 can correspond to regions defined by the partition walls 140, the protection patterns 135, and the protection layer 160.

[48] In the electrophoresis display 10, the electrode, the protection layer, and the substrate disposed in a direction in which an image is displayed can be formed of a transparent material. However, the electrode, the protection layer, and the substrate disposed in a direction in which an image is not displayed can be formed of an opaque material. For example, in the case where an image is displayed in a direction of the second substrate 180 of the electrophoresis display 10 according to the above embodiment, the protection layer 160, the second electrode 170, and the second substrate 180 are formed of a transparent material, but the protection pattern 135, the first electrode 120, and the first substrate 110 can have an opaque material. Meanwhile, in the case where an image is displayed in a direction of the first substrate 110, the protection pattern 135, the first electrode 120, and the first substrate 110 are formed of a transparent material, but the protection layer 160, the second electrode 170, and the second substrate 180 can include an opaque material.

[49] An electrophoresis display is described according to another embodiment of the present invention with reference to FIGS. 1 and 4. Descriptions of the same parts as those of the previous embodiment are omitted for concise explanation.

[50] In the present embodiment, like a protection layer 160 in the above, a protection layer 130 can cover the entire area of the display including a main pixel 50. That is, the protection layer 130 can cover the first electrode 120. Also, the protection layer 130 can have a flat upper surface. In the previous embodiment, the partition walls 140 are disposed between the electrodes 121, 122, and 123, but in the present embodiment, portions of the protection layer 130 are disposed between the electrodes 121, 122, and 123. The partition walls 140 are disposed on the protection layer 130 to define particle regions 145 corresponding to the electrodes 121, 122, and 123 on the protection layer 130. Also, the partition walls 140 can correspond to regions between the electrodes 121, 122, and 123.

[51] The operation of an electrophoresis display is described according to embodiments of the present invention. The electrophoresis display 10 described herein displays an image in the direction of the second substrate 180. A first signal voltage can be provided to the first electrode 120, and a second signal voltage can be provided to the second electrode 170. As the first and second signal voltages are provided, an electric field is formed between the first electrode 120 and the second electrode 170. The charged particles 151, 152, 153, and 155 inside the particle regions 145 move to the first electrode 120 or the second electrode 170 due to the electric field, so that a natural color image can be realized.

[52] The first signal voltage can include various signal voltages provided to the electrodes

121, 122, and 123, respectively. That is, the first signal voltage can include a voltage greater or smaller than the second signal voltage, or a voltage equal to the second signal voltage. For example, a positive voltage, a negative voltage, or a ground voltage can be independently provided to the electrodes 121, 122, and 123 of the first electrode 120, respectively. A ground voltage can be provided to the second electrode 170. Description is made with reference to FIGS. 5 through 7.

[53] Referring to FIG. 5, a ground voltage is provided to the electrodes 122 and 123, and the second electrode 170, and a positive voltage greater than the ground voltage is provided to the electrode 121. Accordingly, an electric field is formed in the subpixel 51, and not formed in other subpixels 52 and 53. The color particles 151 and the background particles 155 disposed in the subpixel 51 move due to the electric field and are disposed adjacent to the second electrode 170 and the first electrode 120. Positively charged color particles 151 are disposed adjacent to the second electrode 170, and negatively charged background particles 155 are disposed adjacent to the electrode 121. The subpixel 51 can display color of the color particles 151 through the color particles 151 disposed adjacent to the second electrode 170. Also, the main pixel 50 including the subpixel 51 can display the color. Accordingly, the electrophoresis display 10 can realize the color in the form of an image.

[54] Referring to FIG. 6, a ground voltage is provided to the second electrode 170, and a positive voltage greater than the ground voltage is provided to each of the electrodes 121, 122, and 123. Accordingly, an electric field is formed in each of the subpixels 51, 52, and 53. The color particles 151, 152, and 153 and the background particles 155 disposed in the subpixels 51, 52, and 53 move due to the electric field and are disposed adjacent to the second electrode 170 and the first electrode 120. Positively charged color particles 151, 152, and 153 are disposed adjacent to the second electrode 170, and negatively charged background particles 155 are disposed adjacent to the electrode 121. The subpixels 51, 52, and 53 can display colors of the color particles 151, 152, and 153 through the color particles 151, 152, and 153 disposed adjacent to the second electrode 170. Also, the main pixel 50 including the subpixels 51, 52, and 53 can display the colors. Accordingly, the electrophoresis display 10 can realize the colors in the form of an image.

[55] Referring to FIG. 7, a ground voltage is provided to the second electrode 170, a positive voltage greater than the ground voltage is provided to the electrodes 121 and 123, and a negative voltage smaller than the ground voltage is provided to the electrode 122. Accordingly, an electric field is formed in each of the subpixels 51, 52, and 53. Here, the direction of the electric field formed in the subpixels 51 and 53 is opposite to that of the electric field formed in the subpixel 52. Color particles 151 and 153 disposed in the subpixels 51 and 53 are disposed adjacent to the subpixels 51 and 53 due to the electric field. Background particles 155 disposed in the subpixels 51 and 53 are disposed adjacent to the electrodes 121 and 123 due to the electric field. Also, color particles 152 disposed in the subpixel 52 are disposed adjacent to the electrode 122 due to the electric field. Background particles 155 disposed in the subpixel 52 are disposed adjacent to the second electrode 152. The subpixels 51 and 53 can display colors of the color particles 151 and 153 through the color particles 151 and 153 disposed adjacent to the second electrode 170. Also, the main pixel 50 including the subpixels 51 and 53 can display the colors. Accordingly, the electrophoresis display 10 can realize the colors in the form of an image.

[56] In the electrophoresis display 10 according to the embodiment of the present invention, substantially uniform amounts of the color particles 151, 152, and 153, and the charged particles 155 can be included in each of the subpixels 51, 52, and 53. Therefore, a high quality color image can be realized and natural color control can be easily performed using the color particles 151, 152, and 153, and the charged particles 155.

[57] A method for forming the electrophoresis display illustrated in FIG. 3 is described with reference to FIGS. 1, 8 through 13.

[58] Referring to FIG. 1 and 8, the first electrode 120 and the protection patterns 135 are formed on the substrate 110. The substrate 110 can be a plastic substrate or a glass substrate. The first electrode 120 and the protection patterns 135 can be formed by sequentially stacking a conductive layer and the protection layer on the substrate 110, and then patterning them. The first electrode 120 and the protection patterns 135 can be substantially simultaneously formed through the patterning. The first electrode 120 and the protection patterns 135 can be formed in an island type arranged in the first direction DA and the second direction DB. The first electrode 120 can include the electrodes 121, 122, and 123 to which an independent signal voltage is provided. The electrodes 121, 122, and 123 can correspond to the subpixels 51, 52, and 53. For example, the first electrode 120 can be formed of a conductive material including a metal or a metal oxide. The protection patterns 135 can be formed of a dielectric material.

[59] Referring to FIGS. 1 and 9, the partition walls 140 are formed on the substrate 110 between the electrodes 121, 122, and 123. The partition walls 140 protrude above the protection patterns 135, so that the upper surface of the partition wall 140 is higher than the upper surface of the protection pattern 135. For example, the partition walls 140 can be formed of a photosensitive polymer such as a photoresist or an inorganic material using photolithography or a laminating method.

[60] The particle regions 145 are defined on the protection pattern 135 by the partition walls 140. The particle regions 145 can one-to-one correspond to the electrodes 121, 122, and 123.

[61] Referring to FIGS. 1 and 10, a sprayer 200 is disposed on the substrate 110 where the particle regions 145 have been defined. The sprayer 200 can include a plurality of discharge units 210, 220, and 230. The number of the discharge units 210, 220, and 230 can correspond to the number of the kinds of the subpixels 51, 52, and 53 (i.e., the number of colors displayed by the subpixels) included in one main pixel 50. Therefore, since the number of the kinds of the subpixels 51, 52, and 53 are three in the embodiment, the charged particle spray 200 can include three discharge units 210, 220, and 230. The three discharge units 210, 220, and 230 are connected using a connecting member 240 to be able to move with the same speed and direction at the same time. The discharge units 210, 220, and 230 can include a dispersion liquid 150 in which charged particles 151, 152, 153, and 155 are dispersed. For example, the discharge unit 210 can include a dispersion liquid 150 in which color particles 151 and background particles 155 have been dispersed. The discharge unit 220 can include a dispersion liquid 150 in which color particles 152 and background particles 155 have been dispersed. The discharge unit 230 can include a dispersion liquid 150 in which color particles 153 and background particles 155 have been dispersed. A nonpolar solvent, for example, toluene which has high volatility and which does not change the surface energy of a particle can be used as a dispersion medium forming the dispersion liquid

150. Also, for example, inorganic oxidation particles or polymer particles can be used as the charged particles 151, 152, 153, and 155. Though the discharge units are used for the sprayer 200 according to the embodiment to inject the dispersion liquid 150, various sprays such as an inkjet printing sprayer that can be applied to a liquid spray method can be used in other embodiments.

[62] A uniform amount of the dispersion liquid 150 can be injected into the particle regions 145 by the discharge units 210, 220, and 230. Accordingly, the color particles

151, 152, and 153, and the background particles 155 can be substantially and uniformly injected into the particle regions 145. Also, color particles 151, 152, and 153 disposed in different subpixels 51, 52, and 53 and representing different colors can be injected simultaneously into the particle regions 145. Also, the discharge units 210, 220, and 230 can inject the dispersion liquid 150 including the color particles 151, 152, and 153 into the particle regions 145 arranged in the second direction DB while moving in the second direction DB. That is, the color particles 151, 152, and 153 taking on different colors can be alternately injected into the particle regions 145 arranged in the first direction DA, and the color particles 151, 152, and 153 taking on the same color can be injected into the particle regions 145 arranged in the second direction DB.

[63] Referring to FIGS. 1, 11, and 12, when the injection of the dispersion liquid 150 into the particle regions 145 arranged in the second direction DB is completed, the sprayer 200 moves in the first direction DA and is disposed on the particle regions 145 in which the dispersion liquid has not been yet injected. Subsequently, the sprayer 200 injects the dispersion liquid 150 into the particle regions 145 while moving in the second direction DB again. FIG. 17 illustrates the movement path of the spray 200. As illustrated in FIG. 17, the spray 200 can move along a shortest path, which can shorten a process time.

[64] Referring to FIGS. 1 and 13, the dispersion medium included in the dispersion liquid

150 can be removed, so that only the color particles 151, 152, and 153, and the background particles 155 can remain inside the particle regions 145. The particle regions 145 can be maintained at a vacuum state. The dispersion medium naturally evaporates at room temperature and thus can be removed.

[65] The second substrate 180 on which the second electrode 170 and the protection layer

160 are sequentially formed is disposed on the first substrate 110 from which the dispersion medium has been removed. The second substrate 180 can be a plastic substrate or a glass substrate. The second electrode 170 can be formed of a conductive material including a metal and a metal oxide. The protection layer 160 can be formed of a dielectric material.

[66] Subsequently, the electrophoresis display illustrated in FIG. 3 can be formed by attaching the first substrate 110 and the second substrate 180.

[67] A method of forming the electrophoresis display illustrated in FIG. 4 is described with reference to FIGS. 1, 14 through 16. Descriptions of the same parts as those of the previous embodiment are omitted for concise explanation.

[68] Referring to FIGS. 1 and 14, the first electrode 120 is formed on the substrate 110.

The first electrode 120 can be formed by forming a conductive layer on the first substrate 110 and then patterning the same. The first electrode 120 can be formed in an island type arranged in the first direction DA and the second direction DB. The first electrode 120 can include the electrodes 121, 122, and 123 to which an independent signal voltage is provided. The electrodes 121, 122, and 123 can correspond to the subpixels 51, 52, and 53, respectively. For example, the first electrode 120 can be formed of a conductive material including a metal or a metal oxide.

[69] The protection layer 130 covering the first electrode 120 is formed on the first substrate 110. The protection layer 130 can be formed of a dielectric material, and can have a flat upper surface through performance of a planarization process.

[70] Referring to FIGS. 1 and 15, the partition walls 140 are formed on the protection layer 130 between the electrodes 121, 122, and 123. The partition walls 140 can be formed of a photosensitive polymer such as a photoresist or an inorganic material using photolithography or a laminating method.

[71] The particle regions 145 are defined on the protection layer 135 by the partition walls

140. The particle regions 145 can one-to-one correspond to the electrodes 121, 122, and 123.

[72] Referring to FIGS. 1 and 16, charged particles including color particles 151, 152, and

153, and the background particles 155 are injected into the particle regions 145 in the same method as that of the previous embodiment. The second substrate 180 on which the second electrode 170 and the protection layer 160 have been formed is disposed on the first substrate 110 in which the charged particles 151, 152, 153, and 155 have been injected. Subsequently, the electrophoresis display illustrated in FIG. 4 can be formed by attaching the first substrate 110 and the second substrate 180.

[73] Up to now, specific embodiments of the present invention have been described. A person of ordinary skill in the art to which the present invention pertains would understand that the present invention can be readily modified within the spirit and scope of the present invention. Therefore, the above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.

Claims

[1] A method of forming an electrophoresis display, the method comprising: forming a first electrode on a substrate; forming partition walls on the substrate, the partition walls defining particle regions on the first electrode; providing a dispersion liquid including charged particles to the particle regions, the charged particles including color particles representing a plurality of colors; and forming a second electrode on the particle regions.

[2] The method of claim 1, wherein providing the dispersion liquid comprises: disposing a plurality of sprayers comprising the dispersion liquid on the particle regions; and moving the sprayers in a predetermined direction, wherein each of the sprayers includs color particles representing different colors, respectively, and the dispersion liquid is injected from the sprayers to the particle regions during the moving.

[3] The method of claim 2, wherein the sprayers are connected to each other and move in the same speed and direction.

[4] The method of claim 2, wherein the sprayers inject a uniform amount of the dispersion liquid into the particle regions.

[5] The method of claim 1, further comprising removing a dispersion medium included in the dispersion liquid after providing the dispersion liquid.

[6] The method of claim 5, wherein the dispersion medium comprises a nonpolar solvent having high volatility.

[7] The method of claim 1, further comprising: forming a first protection layer on an upper surface of the first electrodes; and forming a second protection layer on a lower surface of the second electrode.

[8] The method of claim 1, wherein forming the first electrode comprises: sequentially forming a conductive layer and a protection layer on the substrate; and patterning the conductive layer and the protection layer to form a conductive pattern and a protection pattern arranged in a first direction and a second direction crossing each other.

[9] An electrophoresis display comprising: a irst electrode on a substrate; partition walls on the substrate, the partition walls defining particle regions on the first electrode; charged particles injected in the particle regions by a substantially uniform amount, the charged particles including color particles representing a plurality of colors; and a second electrode on the particle regions.

[10] The electrophoresis display of claim 9, wherein the particle regions are arranged in a first direction and a second direction crossing each other, color particles representing the same color are disposed in the particle regions arranged in the first direction, and color particles representing different colors are alternately disposed in the particle regions arranged in the second direction.

[11] The electrophoresis display of claim 10, wherein the first electrode comprises conductive patterns to which independent signal voltages are provided, respectively, the conductive patterns corresponding to the particle regions.

[12] The electrophoresis display of claim 11, wherein the partition walls are disposed to correspond to regions between the conductive patterns.

[13] The electrophoresis display of claim 12, wherein lower portions of the partition walls fill the regions between the conductive patterns.

[14] The electrophoresis display of claim 9, further comprising: a first protection layer between the first electrode and the particle regions; and a second protection layer between the second electrode and the particle regions.