KR20130011456A - Particle for electrophoretic display device and method of fabricating the same - Google Patents

Particle for electrophoretic display device and method of fabricating the same Download PDF

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Publication number
KR20130011456A
KR20130011456A KR1020110072619A KR20110072619A KR20130011456A KR 20130011456 A KR20130011456 A KR 20130011456A KR 1020110072619 A KR1020110072619 A KR 1020110072619A KR 20110072619 A KR20110072619 A KR 20110072619A KR 20130011456 A KR20130011456 A KR 20130011456A
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South Korea
Prior art keywords
particles
diameter
electrophoretic display
particle
substrate
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KR1020110072619A
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Korean (ko)
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김위용
김진욱
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엘지디스플레이 주식회사
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Priority to KR1020110072619A priority Critical patent/KR20130011456A/en
Publication of KR20130011456A publication Critical patent/KR20130011456A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type

Abstract

PURPOSE: A particle for electrophoresis display device and a method for fabricating the same are provided to prevent the agglomeration phenomenon of particles. CONSTITUTION: Sphere particles(110) have a first diameter. A plurality of polymer beads(115) has a second diameter smaller than the first diameter. The polymer beads are absorbed on the surface of particles. The electrophoresis ink layer(257) includes an electrophoresis particle system(120). The electrophoresis particle system is interposed between a first substrate(211) and a second substrate(236).

Description

Particles for electrophoretic display and manufacturing method thereof {Particle for Electrophoretic display device and method of fabricating the same}

The present invention relates to an electrophoretic display device, and more particularly, to a particle for an electrophoretic display device and a method of manufacturing the same that can reduce the manufacturing cost by simplifying the process.

In general, liquid crystal displays, plasma displays, and organic light emitting displays have become mainstream display devices. However, recently, various types of display devices have been introduced to satisfy rapidly changing consumer demands.

In particular, with the advancement and portability of the information usage environment, the company is accelerating to realize light weight, thinness, and high efficiency. As a part of this, research on electrophoretic display devices combining only the advantages of paper and existing display devices is being actively conducted.

The electrophoretic display device is in the spotlight as a next generation display device having an advantage of ease of portability, and unlike a liquid crystal display device, it does not require a polarizing plate, a backlight unit, a liquid crystal layer, etc., thereby reducing manufacturing costs.

On the other hand, the electrophoretic phenomenon is a phenomenon in which a particle is electrically charged when a particle is suspended in a dispersion medium and, when an electric field is applied to a charged particle, they move through the dispersion medium to an electrode having opposite charges.

Electrophoretic particles for use in electronic ink or electrophoretic display devices utilizing such electrophoretic phenomena include, for example, titanium oxide, zinc oxide, zirconium oxide, iron oxide, aluminum oxide, cadmium selenide, carbon black and barium sulfate. And inorganic pigments such as phthalocyanine blue, phthalocyanine green, Hansa yellow, watching red, and diarylide yellow.

However, conventional electrophoretic particles are very complicated in their preparation method.

Particles with different charges are agglomerated by mutual attraction.

When aggregation occurs between the particles, even if an electric field is applied to the ink layer, the movement of the particles is slowed down or the critical electric field where the movement of the particles is increased does not move and thus does not function as a display device.

Therefore, in order to suppress the aggregation between these particles, the surface treatment process is being performed during the particle manufacturing process.

Surface treatment of such particles is shown in Figures 1a to 1c (a diagram showing a conventional method for surface treatment of particles to prevent agglomeration), using a polymerisation (polymerization) reaction on the surface of the particle 10 This is achieved by forming the blush 13.

However, the surface treatment of the particles 10 through the polymerization reaction for suppressing the aggregation of particles to ensure that the polymer blush 13 of the appropriate level is formed as shown in Figure 1c to suppress the aggregation phenomenon on the particle surface Since the polymerization process and the purification process have to be repeated several times at least two times, the process is very complicated and the production time is relatively long, resulting in a decrease in productivity and an increase in manufacturing cost.

Another method for suppressing the aggregation between particles is a method using a surfactant, the surface treatment method using such a surfactant, there is a problem in the surface adsorption efficiency of the surfactant.

That is, adsorption by simple interaction with surface functional groups and simple physical adsorption are not easy, and thus the efficiency of agglomeration suppression is rapidly reduced by easily losing its function due to collisions between particles during operation and heat having a temperature of 60 ° C. or higher. Problems are occurring.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a particle system for an electrophoretic display device and a method for manufacturing the same and a particle system for an electrophoretic display device that can effectively suppress the aggregation between particles without a separate surface treatment It is an object of the present invention to provide an electrophoretic display device comprising the same.

Particle system for an electrophoretic display according to the present invention for achieving the above object is a spherical particle having a first diameter; And a plurality of polymer beads having a second diameter smaller than the first diameter and adsorbed on the surface of the particles.

The particles are made of a binder resin, which is characterized in that it optionally comprises one or both of pigments or charge control agents (CCA).

The particles are characterized by being + polar or -polar by the CCA, and the particles are characterized by white or black color by the pigment.

The polymer beads are made of any one material of PE (polyester), PS (polystyrene), PA (polyacrylate).

The first diameter is 800 to 900nm, the second diameter is characterized in that 10nm to 200nm.

According to one or more exemplary embodiments, a method of manufacturing a particle system for an electrophoretic display includes: forming a plurality of spherical particles having a first diameter; Mixing the plurality of particles into a solution consisting of a polymer bead and a solvent having a second diameter smaller than the first diameter to form a mixture; Stirring the mixture to adsorb the polymer beads onto the surface of each particle; Drying the stirred mixture is characterized by completing a particle system for an electrophoretic display, characterized in that polymer beads are adsorbed on the surface of the particles.

In this case, the forming of the plurality of particles may include grinding, milling, spraying and rotating a mixture of a binder resin and optionally one or both of a pigment and a charge control agent (CCA). It is characterized by the use of spraying, ultrasonic technology, or electrostatic bonding of two sprayed mists of polymer building blocks.

In addition, the first diameter is 800 to 900nm, the second diameter is 10nm to 200nm, the polymer bead is the polymer bead of any one material of polyester (PE), polystyrene (PS), PA (polyacrylate) It is characteristic that it is made.

An electrophoretic display device according to an embodiment of the present invention comprises: a first substrate; A gate wiring and a data wiring formed on the first substrate to define a pixel region by crossing each other with a gate insulating film interposed therebetween; A thin film transistor formed at the center of the pixel region; A pixel electrode connected to the drain electrode of the thin film transistor and formed in a first region of a central portion of the pixel region; A second substrate facing the first substrate; A common electrode formed on an inner side surface of the second substrate; An electrophoretic display comprising spherical particles having a first diameter and resumed between the first and second substrates and a plurality of polymer beads having a second diameter smaller than the first diameter and adsorbed on the surface of the particles And an ink layer comprising a particle system for the device.

At this time, the second substrate is characterized in that the color filter layer is formed to cover the common electrode.

In addition, the particles are made of a binder resin, optionally characterized in that it comprises any one or all of pigments or charge control agents (CCA), the particles are + polar or -polar by the CCA, the particles Represents a white or black color by the pigment.

In addition, the polymer bead is characterized in that the polymer bead is made of any one material of PE (polyester), PS (polystyrene), PA (polyacrylate), the first diameter is 800 to 900nm, the second diameter is It is characterized by being 10 nm to 200 nm.

Electrophoretic display particles according to the present invention has an effect that can suppress the aggregation of particles by having a polymer bead having a size of several to several hundred nanometers on the surface.

Furthermore, since the process of attaching the polymer beads to the particle surface is very simple, the manufacturing cost can be reduced and the production time can be shortened, thereby improving productivity.

By using a polymer having excellent thermal properties, the heat resistance of the particles is enhanced, so that aggregation between particles is suppressed even if a temperature rise is caused by external heat applied to the electrophoretic display.

Since the size uniformity of the particles is excellent, there is an effect of more effectively suppressing the driving voltage rise and the aggregation between the particles caused by the difference in the size uniformity of the particles.

1a to 1c is a view showing a surface treatment method of particles for preventing agglomeration in the prior art.
2A through 2C are cross-sectional views illustrating steps in manufacturing particles for an electrophoretic display device according to an exemplary embodiment of the present invention.
3A to 3D illustrate polarity characteristics of a particle system for an electrophoretic display device according to an exemplary embodiment of the present invention.
Figure 4 is an enlarged photograph of the surface of the electrophoretic particles during the stirring process for adsorbing the polymer beads to the particle surface during the process being prepared according to an embodiment of the present invention.
5 is a cross-sectional view of a portion of a display area of an electrophoretic display device according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described for the electrophoretic display particle and the method of manufacturing the same according to the present invention.

2A through 2C are cross-sectional views illustrating manufacturing steps of particles for an electrophoretic display device according to an exemplary embodiment of the present invention.

First, as shown in FIG. 2A, a mixture in which a binder resin is selectively mixed with a charge control agent (CCA) and a pigment is mixed using, for example, a ball mill or a stirrer. This is heat-treated and dried to form particles 110 having an average diameter of 800 to 900 nm.

In this case, the particles 110 may have a positive or negative charge property under the influence of the selectively mixed CCA and the pigment, and the color may also have various colors depending on the material of the mixed pigment other than black and white.

The method of manufacturing the particles 110 may be variously made by a general method.

That is, the method for producing particles 110 having a size of about 800 nm to 900 nm in average diameter described above may be used for grinding, milling, nozzle spray, rotary spray, ultrasonic technology, or polymer building block. It can be prepared by any of a variety of conventional known techniques, including electrostatic bonding of two mists sprayed.

At this time, by using the pigment having a variety of colors other than the white or black or may be to achieve a particle 110 having a black, white or various colors.

The pigments are azo, phthalocyanine, benzimidolone, quinacridone, isoindolinone, pyratrone, dibromanthanthrone, indatron, anthrapyrimidine, prabatron, Condensation including perylene, perinone, quinoptharon, phthalone, cyidigo, indigo, dioxazine, anthraquinone, chianthene, methine and azomethine pigments and other metal complex pigments Organic pigments, such as polycyclic pigments, milly blue, iron oxide, cobalt purple, manganese purple, ultramarine blue, prussian blue, cobalt blue, cellulian blue, pyridian, emerald green, cobalt green and red iron oxide The same inorganic pigment may be used, and further, black may further include carbon black, titanium oxide, and copper chromite as a pigment.

Thus prepared particles (110) having an average diameter of 800 to 900nm exhibits the properties of positive charge or negative charge by the selectively added CCA.

Next, as shown in FIG. 2B, the polymer beads 115 having the average diameters of 10 nm to 200 nm, which are the most characteristic components in the embodiments according to the present invention, are prepared by various methods as described above. After mixing to have a proper content ratio in the solution 180 consisting of the mixed solvent, it is stirred through a stirrer 190.

At this time, the polymer bead 115 is characterized in that it is made of any one material of PE (polyester), PS (polystyrene), PA (polyacrylate), and may have the characteristics of positive or negative charge by itself, or positive or It can also be neutral without negatively charged properties.

On the other hand, if the particles are mixed in a state in which the particles 110 having an average diameter of 800 nm to 900 nm and the polymer beads 115 having an average diameter of 10 nm to 200 nm are mixed in a solvent, the particles having a large average diameter in the properties of the particles 110 are characterized. The polymer beads 115 having a small diameter are adsorbed to the surface of the (110) surface, and the plurality of polymer beads 115 adsorbed to the surface of the particle (110) may not have a large heat supply of 100 ° C. or more. 110) It is characterized by maintaining the state adsorbed on the surface.

At this time, in the particle 110 having an average diameter of 800 nm to 900 nm by the stirring process, when the particle 110 has a negative charge property, as shown in Figs. 3a and 3b. On the surface thereof, polymer beads 115 having positive charge properties or polymer beads 115 in a neutral state are adsorbed, and the particles 110 have positive charge properties shown in FIGS. 3C and 3D. As described above, polymer beads 115 having a negative (-) charge property or polymer beads 115 in a neutral state are adsorbed on the surface thereof.

In this case, the stirring process is performed by mixing the polymer beads 115 having the positive charge property or the neutral polymer beads 115 with respect to the particles 110 having the negative charge property, and the particles having the positive charge property ( For the 110, it is possible to adjust the particle system 120 having the four states described above by mixing the polymer beads 115 having the negative charge property or the neutral polymer beads 115.

Next, as shown in FIG. 2C, after the aforementioned stirring operation is completed, the solvent is removed by drying, and the polymer beads (optional) are removed on the surface of the particles by selectively removing the polymer beads 115 and the particles which remain unreacted. A particle system in which 115 is adsorbed can be obtained.

4 is an enlarged photograph of the surface of the electrophoretic particles during the stirring process for adsorbing the polymer beads 115 to the particle surface during the process of being manufactured according to an embodiment of the present invention.

Referring to FIG. 4, it can be seen that the polymer beads 115 having a relatively even size are adsorbed onto the particle surface by stirring the solvent mixed with the polymer beads 115.

In the particle system 120 in which the polymer beads 115 having an average diameter of 10 to 200 nm are adsorbed on the surface of the particles 110 having an average diameter of 800 nm to 900 nm, the agglomeration between particles is a result of the conventional polymer blush. It can be seen that the level of aggregation between the particles formed.

In this case, the electrophoretic particle system 120 according to an embodiment of the present invention is simply added to the solution having a proper content ratio in the solution mixed with the polymer bead 115 in the solvent compared to the surface treatment to form a polymer brush on the surface of the particle Since it is prepared by agitation after the polymerization-refining process is repeated several times, the manufacturing time is relatively short, and the manufacturing cost is reduced by simplifying.

In addition, in the particle system 120 for an electrophoretic display device manufactured according to an embodiment of the present invention, even if the temperature is about 60 to 70 ℃ by the surrounding environment, the surface treatment using a conventional surfactant Unlike the moving particles, the problem that the polymer beads 115 adsorbed on the surface of the particles do not occur, so that problems such as an increase in agglomeration with temperature increase do not occur.

Table 1 shows an electrophoretic display device having an electrophoretic particle system according to the present invention and an electrophoretic display device having electrophoretic particles surface-treated using a surfactant as a comparative example, each in a 70 ° C. temperature atmosphere. White and black luminance and contrast ratios were measured at 0 and 24 hours of exposure.

70 ℃ White luminance Black luminance Contrast Ratio Comparative example Surfactant (0hr) 44.7% 4.5% 9.93 Surfactant (24hr) 36.3% 6.9% 5.26 Example Polymer Beads (0hr) 45.3% 4.6% 9.85 Polymer Beads (24hr) 44.8% 4.7% 9.53

Referring to Table 1, an electrophoretic display device having an electrophoretic particle system represented by white or black manufactured according to the present invention has a contrast ratio of 9.85 and 9.53, respectively, when exposed for 0 hours and 24 hours in a 70 ° C. temperature environment. In contrast, the electrophoretic display device having the electrophoretic particles surface-treated using the surfactant according to the comparative example exhibited a contrast ratio of 9.93 and 0 hours and 24 hours, respectively, at a temperature of 70 ° C. By 5.26, it can be seen that a sharp decrease in contrast ratio occurs.

Therefore, it can be seen that the electrophoretic particle system manufactured according to the present invention becomes a component capable of stably displaying an image with respect to changes in the surrounding environment such as temperature change.

Hereinafter, an electrophoretic display device having an electrophoretic particle system according to the present invention will be briefly described.

5 is a cross-sectional view of a portion of a display area of an electrophoretic display device according to an exemplary embodiment of the present invention.

As shown, the electrophoretic display device 201 according to an embodiment of the present invention is provided between the first and second substrates 211 and 236 opposed to each other and the first and second substrates 211 and 236. Electrophoretic ink layer 257 having intervening electrophoretic particle system 120.

The electrophoretic ink layer 257 may include first and second adhesive layers 251 and 253 made of a transparent material and a common electrode 255 made of a transparent conductive material therebetween, corresponding to the opposite surface, and FIG. 2A. To a plurality of electrophoretic particle system 120 according to an embodiment of the present invention prepared as described with reference to Figure 2c is attached in the form of a film 260 with a dispersed solvent.

In this case, as an example, some of the plurality of electrophoretic particle systems 120, that is, the particle system 120B displaying black may be positively polarized, and the particle system 120W displaying white may be negatively charged. Or charged to have the opposite nature. In this case, a polymer bead 115 having -polarity or neutral property is adsorbed around the particles having + polarity, and polymer beads having + polarity or neutral property at the periphery of the particles having -polarity It is characterized by that 115 is adsorbed.

In the ink layer 257 having such a structure, each of the electrophoretic particle systems 120 is characterized by movement according to the polarity of the particles 110 having an average diameter of 800 to 900 nm. The polarity of the polymer beads 115 is relatively weaker than the polarity of the particles 110 and thus does not form a main polarity. The polymer beads 115 having such polarities are formed between neighboring electrophoretic particle systems 120. It is characterized by acting as a factor of suppressing aggregation.

On the other hand, the second substrate 236 is a transparent plastic material or glass is used, the first substrate 211 is mainly used an opaque stainless (stainless) material, if necessary transparent plastic material or transparent glass material This can be used.

On the other hand, the first substrate 211 includes a gate wiring (not shown) and a data wiring (not shown) defining a pixel area P vertically intersecting in a matrix form, and the gate wiring (not shown) and data. The thin film transistor Tr, which is a switching element, is formed for each pixel region P at an intersection point of the wiring (not shown). In this case, when the first substrate 211 is made of stainless steel, an insulating layer (not shown) made of an insulating material is first formed, and the above-described components are formed thereon.

The thin film transistor Tr may include a gate electrode 214 extending from a gate line (not shown), a gate insulating layer 216 covering the gate electrode 214, and overlapping the gate electrode 214 and may be pure amorphous silicon. A semiconductor layer 218 including an active layer 218a of the semiconductor layer and an ohmic contact layer 218b of impurity amorphous silicon, a source electrode 220 in contact with the semiconductor layer 218 and extending from a data line (not shown); The drain electrode 22 is spaced apart from the source electrode 220.

In addition, a passivation layer 226 including a drain contact hole 227 exposing the drain electrode 222 is formed on the entire surface of the thin film transistor Tr.

The pixel electrode 228 connected to the drain electrode 222 through the drain contact hole 227 is formed on the passivation layer 226 corresponding to each pixel region P. Referring to FIG. The pixel electrode 228 is mainly composed of one selected from a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO).

The electrophoretic display 201 having such a structure uses external light including natural light or room light as a light source, and is selectively applied with a positive polarity or a negative polarity by the thin film transistor Tr. An electrode 228 induces a change in position of the particle system 120W representing a plurality of whites and the particle system 120B representing black in the electrophoretic ink layer 257 to implement an image or text.

On the other hand, the electrophoretic display device according to the embodiment of the present invention having such a configuration, although not shown in the drawing, red, green, blue and optionally white color filter pattern on the entire surface of the display area on the inner surface of the second substrate 236. A color filter layer (not shown) may be further formed to sequentially repeat the pixel region P. FIG.

In this case, when the color filter layer (not shown) is included, the display device becomes an electrophoretic display device capable of realizing a full color image. When the color filter layer is not included, the monotype electrophoretic display mainly displays text only. It becomes a device.

 The present invention is not limited to the above-described embodiments, and it will be apparent that various changes and modifications can be made without departing from the spirit and spirit of the present invention.

110: particle 115: polymer beads
120: electrophoretic particle system
120B, 120W: Black and White Electrophoretic Particle Systems
201: electrophoretic display 211: first substrate
214: gate electrode 216: gate insulating film
218: semiconductor layer 218a: active layer
218b: ohmic contact layer 220: source electrode
222: drain electrode 226: first protective layer
227: drain contact hole 228: pixel electrode
236: second substrate 251: first adhesive layer
253: second adhesive layer 255: common electrode
257: electrophoretic ink layer 260: electrophoretic film
Tr: Thin Film Transistor TrA: Switching Area

Claims (15)

Spherical particles having a first diameter;
A plurality of polymer beads having a second diameter smaller than the first diameter and adsorbed to the surface of the particles
Particle system for electrophoretic display comprising a.
The method of claim 1,
And said particles are made of a binder resin and optionally comprise any one or all of pigments or charge control agents (CCAs).
The method of claim 2,
And wherein the particles are + polarized or -polarized by the CCA.
The method of claim 2,
And wherein said particles exhibit white or black color by said pigment.
The method of claim 1,
The polymer bead is a particle system for an electrophoretic display device, characterized in that made of any one material of polyester (PE), polystyrene (PS), poly (PA).
The method of claim 1,
The first diameter is 800 to 900nm,
And said second diameter is in the range of 10 nm to 200 nm.
Forming a plurality of spherical particles having a first diameter;
Mixing the plurality of particles into a solution consisting of a polymer bead and a solvent having a second diameter smaller than the first diameter to form a mixture;
Stirring the mixture to adsorb the polymer beads onto the surface of each particle;
And drying the stirred mixture, thereby completing a particle system for an electrophoretic display, wherein a polymer bead is adsorbed on a surface of the particle.
The method of claim 7, wherein
The forming of the plurality of particles may include grinding, milling, nozzle spraying, rotary spraying, of a mixture of a binder resin and optionally one or both of a pigment or a charge control agent (CCA), A method of making a particle system for an electrophoretic display, characterized in using either ultrasonic technology, electrostatic bonding of two sprayed mists of polymer building blocks.
The method of claim 7, wherein
The first diameter is 800 to 900nm, the second diameter is 10nm to 200nm, the polymer bead is the polymer bead is made of any one material of PE (polyester), PS (polystyrene), PA (polyacrylate) Characterized by a method for producing a particle system for an electrophoretic display.
A first substrate;
A gate wiring and a data wiring formed on the first substrate to define a pixel region by crossing each other with a gate insulating film interposed therebetween;
A thin film transistor formed at the center of the pixel region;
A pixel electrode connected to the drain electrode of the thin film transistor and formed in a first region of a central portion of the pixel region;
A second substrate facing the first substrate;
A common electrode formed on an inner side surface of the second substrate;
An electrophoretic display comprising spherical particles having a first diameter and resumed between the first and second substrates and a plurality of polymer beads having a second diameter smaller than the first diameter and adsorbed on the surface of the particles Ink layer containing particle system for the device
Electrophoretic display device comprising a.
11. The method of claim 10,
And a color filter layer formed on the second substrate to cover the common electrode.
11. The method of claim 10,
The particles are made of a binder resin, optionally electrophoretic display characterized in that it comprises any one or both of a pigment or a charge control agent (CCA).
13. The method of claim 12,
And the particles exhibit + polarity or -polarity by the CCA, and the particles exhibit white or black color by the pigment.
11. The method of claim 10,
The polymer bead is electrophoretic display device characterized in that the polymer bead is made of any one material of polyester (PE), polystyrene (PS), poly (PA).
11. The method of claim 10,
The first diameter is 800 to 900nm,
And wherein the second diameter is from 10 nm to 200 nm.
KR1020110072619A 2011-07-21 2011-07-21 Particle for electrophoretic display device and method of fabricating the same KR20130011456A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180036276A (en) * 2016-09-30 2018-04-09 엘지디스플레이 주식회사 Reflective display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180036276A (en) * 2016-09-30 2018-04-09 엘지디스플레이 주식회사 Reflective display device

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