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Method of manufacturing charged particle, charged particle, electrophoretic dispersion liquid, electrophoretic sheet, electrophoretic device and electronic equipment

A technology of charged particles and a manufacturing method, which is applied in the directions of instruments, nonlinear optics, optics, etc., can solve the problems of large electric field, difficulty in obtaining charged amount of electrophoretic particles, and large power consumption of electrophoretic display devices.

Active Publication Date: 2007-08-29
E INK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these electrophoretic particles are difficult to obtain a sufficiently large charge, and are not very sensitive to electric fields.
[0008] Therefore, in order to make the electrophoretic particles electrophoresis more efficiently, a larger electric field is necessary, which has the problem of large power consumption of the electrophoretic display device.

Method used

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  • Method of manufacturing charged particle, charged particle, electrophoretic dispersion liquid, electrophoretic sheet, electrophoretic device and electronic equipment
  • Method of manufacturing charged particle, charged particle, electrophoretic dispersion liquid, electrophoretic sheet, electrophoretic device and electronic equipment
  • Method of manufacturing charged particle, charged particle, electrophoretic dispersion liquid, electrophoretic sheet, electrophoretic device and electronic equipment

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Experimental program
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Effect test

no. 1 approach

[0102] The charged particles of the first embodiment are positively charged charged particles (positively charged particles).

[0103] 1 is a longitudinal sectional view showing a first embodiment of the charged particle of the present invention, FIG. 2 is a schematic view showing the polymer structure of the charged particle shown in FIG. 1 , and FIG. 3 shows an example of the polymer shown in FIG. 2 schematic diagram.

[0104] A charged particle 1 shown in FIG. 1 has a mother particle 2 and a coating layer 3 provided on the surface of the mother particle 2 .

[0105] As the mother particle 2, for example, at least one of pigment particles, resin particles, or composite particles thereof is suitably used. These particles are easy to manufacture.

[0106] Examples of pigments constituting pigment particles include black pigments such as aniline black, carbon black, and titanium black, white pigments such as titanium dioxide, antimony trioxide, barium sulfate, zinc sulfide, z...

no. 2 approach

[0186] Next, a second embodiment of the charged particles of the present invention will be described.

[0187]Hereinafter, the charged particles 1 of the second embodiment will be mainly described in terms of differences from the charged particles 1 of the first embodiment described above, and descriptions of the same matters will be omitted.

[0188] FIG. 5 is a schematic view showing the constitution of a polymer included in the charged particle of the second embodiment, and FIG. 6 is a schematic view showing an example of the polymer shown in FIG. 5 .

[0189] The charged particles 1 of the second embodiment are positively charged particles (positively charged particles), but the structure of the polymer 5 constituting the coating layer 3 is different, and are basically the same as the charged particles 1 of the above-mentioned first embodiment.

[0190] That is, the polymer 5 of the second embodiment has a cationic group 41 at the terminal (the other end) of the main chain...

no. 3 approach

[0231] Next, a third embodiment of the charged particles of the present invention will be described.

[0232] Hereinafter, regarding the charged particle 1 of the third embodiment, differences from the charged particle 1 of the above-mentioned first embodiment will be mainly described, and descriptions of the same items will be omitted.

[0233] 8 is a longitudinal sectional view showing a third embodiment of the charged particle of the present invention, FIG. 9 is a schematic view showing the structure of a polymer having the charged particle shown in FIG. 8 , and FIG. 10 is a view showing one of the polymers shown in FIG. Schematic diagram of the example.

[0234] The charged particles 1 shown in FIG. 8 are negatively charged particles (negatively charged particles), and are basically the same as the charged particles of the above-mentioned first embodiment except that the composition of the covering layer 3 is different.

[0235] That is, the structure of the covering laye...

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Abstract

The present invention provides a method of manufacturing charged particle which can control the particle charge amount, a charged particle which can control the sensitivity of the electric field, an electrophoretic dispersion liquid using the charged particle and having high reliability, an electrophoretic display sheet, an electrophoretic device and an electronic equipment. The charged particle (1) includes a mother particle (2) and a coating layer (3) covering at least one portion of the surface of the mother particle (2). The method of manufacturing the charged particle (1) has a first step for preparing the mother particle (2) and a second step for forming the coating layer (3), the second step includes a first step of coupling a first chemical compound having at least a part where is going to be a starting point of living polymerization to the surface of the mother particle (2) and a second step of polymerizing a second chemical compound having an ionic group or a functional group convertible to an ionic group so as to form a polymer through the living polymerization that starts from the starting point of the first chemical compound.

Description

technical field [0001] The invention relates to a preparation method of charged particles, charged particles, electrophoresis dispersion liquid, electrophoresis sheet, electrophoresis device and electronic equipment. Background technique [0002] In general, in a dispersion system in which fine particles are dispersed in a liquid, it is known that the fine particles move (migrate) in the liquid by Coulomb force under the action of an electric field. This phenomenon is called electrophoresis, and an electrophoretic display device that displays desired information (image) using electrophoresis has attracted attention as a new display device in recent years. [0003] The electrophoretic display device is characterized in that it has display memory and wide viewing angle in a state where the voltage application is stopped, and can realize high-contrast display with low power consumption, and the like. [0004] Furthermore, since the electrophoretic display device is a non-lumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/167
CPCG02F1/167G02F2001/1678
Inventor 宫泽贵士
Owner E INK CORP
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