JP3492237B2 - Display device manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a display device in which charged electrophoretic particles are moved for displaying.

[0002]

2. Description of the Related Art In recent years, with the development of information equipment, there has been an increasing need for low power consumption and thin display devices, and research and development of display devices meeting these needs have been actively conducted. Among them, the liquid crystal display device, which electrically controls the alignment of liquid crystal molecules to change the optical characteristics of the liquid crystal, has been actively developed and commercialized as a display device that can meet the above needs.

Har is one of such display devices.
old D.D. An electrophoretic display device proposed by Lees et al. (US Pat. No. 3,612,758) is known. FIG. 7 is a diagram showing the structure and operation principle of the electrophoretic display device. The display device P ₃ includes a pair of substrates 1a and 1b arranged with a predetermined gap therebetween. Electrodes 36 and 37 are formed on the substrates 1a and 1b, respectively. Further, in the gap between the substrates, a large number of charged electrophoretic particles 5 that are positively charged and colored, and a migration dispersion liquid 4 in which a dye is dissolved and colored in a color different from that of the charged electrophoretic particles 5 are formed. A plurality of partitions 2 are arranged along the plane direction of the substrate by arranging partition walls 3 further.
(Only one section is shown in the drawing) to prevent uneven distribution of the charged electrophoretic particles 5 and to define the substrate gap.

In such a display device P ₃ , the same figure is used.
As shown in (a), when a negative voltage is applied to the electrode 37 on the lower side in the drawing and a positive voltage is applied to the electrode 36 on the upper side in the drawing, the charged electrophoretic particles 5 that are positively charged move downward. When the display devices are gathered so as to cover the side electrodes 37 and viewed from the direction A in the drawing, the same color as the electrophoretic dispersion liquid 4 is displayed. On the other hand, as shown in FIG. 2B, when a positive voltage is applied to the lower electrode 37 in the figure and a negative voltage is applied to the upper electrode 36 in the figure, the positively charged The electrophoretic particles 5 gather to cover the upper electrode 36, and when the display device is viewed from the direction A in the figure, the same color as the charged electrophoretic particles 5 is displayed. By performing such driving for each section, an arbitrary image is displayed by a large number of sections.

By the way, in the above-mentioned display device P ₃ , it is desirable that the color density of each section 2 is substantially uniform. For that purpose, the charged electrophoretic particles 5 are arranged in substantially equal amounts in each section. There is a need. As a manufacturing method therefor, there have been the following methods. That is, in the method disclosed in JP-A-64-86117, the partition wall 3 is made of a material that swells (increases the volume) by being immersed in the electrophoretic dispersion liquid 4, and the partition wall 3 is prepared in advance. When the particles are not swollen, the electrophoretic dispersion liquid 4 is injected together with the charged electrophoretic particles 5, and then the partition walls 3 are formed by the electrophoretic dispersion liquid.
And a method for forming compartments 2 by swelling the compartments, or a method disclosed in Japanese Patent Application Laid-Open No. 1-248183, wherein a through-hole is formed in each compartment in the substrate 1a or 1b to form a pair of substrates. A method of injecting the electrophoretic dispersion liquid 4 together with the charged electrophoretic particles 5 through these through holes after laminating 1a and 1b, and a method disclosed in Japanese Patent Laid-Open No. 223935/1990. The substrate 1a or 1b having the partition walls 3 formed thereon is dipped in the dispersion liquid 4 in which the charged electrophoretic particles 5 are dispersed, and the flexible film (the other substrate) is sequentially pressure-bonded in that state. and so on.

[0006]

However, even if the above methods (1) to (4) are used, there is a limit to disposing the charged electrophoretic particles 5 in substantially equal amounts in each section, and the color density of each section 2 is limited. There is a problem that they are not equal and display quality is deteriorated.

The reason why the charged electrophoretic particles 5 cannot be arranged in substantially equal amounts in each section is as follows. That is, in the above method, the injection of the electrophoretic dispersion liquid 4 is performed in the direction along the substrate surface from one end to the other end of the substrate, but since the charged electrophoretic particles 5 are charged, the injection is performed. This is because the charged electrophoretic particles 5 adhere to the surfaces of the substrate and the partition walls 3 on the upstream side in the direction and do not spread to every corner of the substrate gap, and the density of the charged electrophoretic particles 5 is high in the injection direction upstream side and low in the injection direction downstream side. . Further, in the above method, the charged electrophoretic particles 5 are easily attached to the through-hole portion, and the injection of the electrophoretic particles 5 into each section is hindered in the section where the attached amount is large, so that the attached amount. This is because the injection amount of the charged electrophoretic particles 5 is relatively large in a section having a small number. In addition, when increasing the definition of the display device, there is no choice but to reduce the partition area, which makes it difficult to form the through hole itself. Furthermore, in the above method, the dispersion liquid 4 in each section is dispersed for various reasons (for example, when the height of the partition wall 3 is different or when the flexible film is sequentially pressed). This is because the amounts are different, and accordingly, the amounts of the charged electrophoretic particles 5 are not equal in each section.

[0008] Therefore, an object of the present invention is to provide a method of manufacturing a display device which prevents deterioration of display quality.

[0009]

The present invention has been made in consideration of the above circumstances, and includes a pair of substrates arranged with a predetermined gap therebetween and the predetermined gap along the surface of the substrate. A partition member arranged so as to be divided into a plurality of compartments, an electrophoretic dispersion liquid and a large number of charged electrophoretic particles respectively arranged in the plurality of compartments, and these electrophoretic dispersion liquids and electrophoretic particles in each compartment A first electrode and a second electrode arranged so as to face each other, and a method of manufacturing a display device for manufacturing a display device, wherein: The large number of charged electrophoretic particles are arranged on one substrate so that the amounts of the respective compartments are substantially equal to each other, and the electrophoretic dispersion liquid is arranged after the arrangement of the large number of charged electrophoretic particles. The feature is to do.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
An embodiment of the present invention will be described.

First, the structure of a display device manufactured according to the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the display device manufactured according to the present invention includes a pair of substrates 1a and 1b arranged with a predetermined gap, and the substrate 1 having the predetermined gap.
A partition member 3 arranged so as to be divided into a plurality of sections 2 along the surfaces a and 1b, a dispersion liquid 4 for migration and a large number of charged electrophoretic particles 5 respectively arranged in the plurality of sections 2.
And a first electrode 6 arranged in each section 2 so as to face the electrophoretic dispersion liquid 4 and the charged electrophoretic particles 5.
(Reference numeral 16 in FIG. 2) and the second electrode 7 (reference numeral 1 in FIG. 2)
7) and are provided. The charged electrophoretic particles 5 are charged to have a predetermined polarity.

In this case, the first electrode and the second electrode are as shown in FIG.
2 may be supported on the same substrate 1b as indicated by reference numerals 6 and 7, and separate substrates 1b may be supported as indicated by reference numerals 16 and 17 in FIG.
It may be supported by a and 1b.

When the first electrode 6 and the second electrode 7 are supported on the same substrate 1b, the first electrode 6 faces the electrophoretic dispersion liquid 4 in each section 2 as shown in FIG. The area S _{1 of the} (exposed) portion (hereinafter referred to as “exposed area S ₁ of the first electrode 6”) is made larger than the exposed area S ₂ of the second electrode 7, and the first electrode The portion of 6 facing the electrophoretic dispersion liquid 4 is colored with a first color (for example, white, or a metal color when the display device is a reflective type), and the charged electrophoretic particles 5 are colored with a second color. Coloring (for example, black) is preferable. Here, the first color may be colored as long as it is applied to the portion where the first electrode 6 faces the electrophoretic dispersion liquid 4 as described above, and even if the first electrode 6 itself is colored, The film covering the first electrode 6 (ex. Electrode protective film) may be colored. In this case, as shown in FIG. 1, the second color (for example, black) is displayed in the section 2 in which the charged electrophoretic particles 5 are gathered so as to cover the first electrode 6, and the second color is displayed.
In the section 2 gathered so as to cover the electrodes 7, the first color (for example, white) is displayed. By the way, the display contrast in this case is different from that of the first electrode 6 and the second electrode 6.
It largely depends on the exposed area ratio of the electrode 7 (= exposed area of the second electrode 7 / exposed area of the first electrode 6). The larger the exposed area ratio, the smaller the contrast, and the smaller the exposed area ratio, the more the contrast. growing. In order to realize a large contrast, this exposed area ratio may be set to about 1/2 to 1/4. In addition, in FIG. 1, the first electrode 6 is
The electrodes 7 and 7 are arranged so as to overlap with each other, and the insulating layer 8 is arranged between them to be insulated. However, it is not limited to this, and both electrodes 6 and 7 may be arranged so as not to overlap. .

On the other hand, when the first electrode 16 and the second electrode 17 are supported on separate substrates 1a and 1b as shown in FIG. 2, at least one of the electrodes 16 (the electrode arranged on the observer side). 16) is made transparent and is formed on almost the entire section 2 (not necessarily on the entire substrate, but at least on almost the entire section 2), and the electrophoretic dispersion liquid 4 is of the first color (for example, , Blue) and the charged electrophoretic particles 5 are colored in a second color (for example, black). In such a case, as shown in FIG.
When the display device P ₂ is viewed from the direction of the arrow A in the section 2 where the particles are collected so as to cover the electrodes 17, only the electrophoretic dispersion liquid 4 is visually recognized and the charged electrophoretic particles 5 are not visually recognized.
The first color display is performed by the electrophoretic dispersion liquid 4. In the section 2 in which the charged electrophoretic particles 5 are collected so as to cover the electrodes 16, only the charged electrophoretic particles 5 colored in the second color are visually recognized and the electrophoretic dispersion liquid 4 is not visually recognized. Will be performed. In this case, since the display contrast does not depend on the exposed area ratio of the first electrode 16 and the second electrode 17, it is sufficient if at least one of the electrodes 16 is formed on almost the entire section 2 as described above. , Both electrodes 16 and 1 from the viewpoint of display contrast
It is not necessary to adjust the exposed area ratio of No. 7. That is, from the viewpoint of display contrast, it is not necessary to make the exposed area of the other electrode 17 smaller than the exposed area of the one electrode 16, and for example, both electrodes 16 and 17 are formed in almost the entire section 2. You may do it.

By the way, regardless of whether the first electrodes 6 and 16 and the second electrodes 7 and 17 are supported by the same substrate 1b, or whether they are supported by different substrates 1a and 1b, these electrodes 6 , 7, 16 and 17 may or may not be formed in contact with the substrates 1a and 1b. Further, on the surfaces of these electrodes 6, 7, 16 and 17, it is preferable to form an insulating layer 8, an electrode protective layer 9 and a black matrix pattern as needed.

Further, the above-mentioned first electrode 6 and second electrode 7
The polarity of the potential difference between (or the first electrode 16 and the second electrode 17) is configured so that it can be changed independently in each section 2. The method is as follows: * Both the first electrode 6 and the second electrode 7 (or the first electrode 1
6 and the second electrode 17) are formed in a dot shape in each section 2 and a voltage of any polarity is applied to each of the electrodes 6, 7 or 16, 17 (not shown), or * As shown in FIG. 1 and FIG. 2, one electrode 6, 16 is formed over almost the entire substrate 1a or 1b to be a common electrode, and the other electrode 7, 17 is formed in a dot shape for each section 2. However, one of the electrodes 6 and 16 serving as the common electrode may be grounded or the like to be held at a reference potential, and a voltage of arbitrary polarity may be applied to the other electrodes 7 and 17. Here, the magnitude of the applied voltage is
It may be adjusted according to the charge amount of the charged electrophoretic particles 5 and the pitch between the electrodes, but normally, several tens of V is required.

On the other hand, the display devices P ₁ and P ₂ may be transmissive or reflective. In addition, when observing from the direction of arrow A shown in FIG.
When the display device P ₁ is of a transmissive type, the electrode 6 has an IT
If a transparent electrode such as O (indium tin oxide) is used and the display device P ₁ is of a reflective type, a metal electrode such as Al may be used. In addition, the first electrode 6 shown in FIG.
For this, a transparent electrode such as ITO (Indium Tin Oxide) may be used regardless of whether the display device P ₂ is a transmissive type or a reflective type.

Further, the second electrode 7 shown in FIG.
Although a metal material such as Ti or Ti may be used, a black material, such as TiC, is preferably used.

Furthermore, the insulating layer 8 may be made of an organic material such as acrylic resin or polyimide resin, or an inorganic material such as silicon oxide or silicon nitride. When the display device is of a reflection type, white fine particles such as alumina may be mixed to provide a function as a scattering layer.

On the other hand, general glass can be used for the above-mentioned substrates 1a and 1b, but polyethylene terephthalate (PET) is used to make the display device flexible.
Alternatively, a plastic film such as polyether sulfone (PES) may be used.

The partition member 3 is made of silicone rubber,
Fluorine rubber, acrylic rubber, or other photosensitive resin may be used.

Further, as the electrophoretic particles 5, those having a polymer resin such as polystyrene or polyethylene as a main component and a colorant such as carbon mixed therein can be preferably used. If necessary, a charge control agent or the like may be mixed, and the particle diameter is preferably 0.1 to 100 μm, and the smaller diameter is more preferable.

Furthermore, it is preferable to use, as the electrophoretic dispersion liquid 4, a liquid in which the charged electrophoretic particles 5 are favorably charged and has a low viscosity. Specifically, silicone oil, xylene, toluene, isoper, etc. are used. good. Further, as the electrophoretic dispersion liquid 4, one having a large specific gravity is used if necessary,
It is preferable that the specific gravity of the electrophoretic dispersion liquid 4 and the specific gravity of the charged electrophoretic particles 5 be substantially equal.

Next, a method of manufacturing the display devices P ₁ and P ₂ will be described with reference to FIGS. 3 and 4.

When manufacturing the display devices P ₁ and P ₂ , _{one of} the pair of substrates 1a and 1b is arranged before the pair of substrates 1a and 1b are arranged with a predetermined gap therebetween. The large number of charged electrophoretic particles 5 are scattered and attached to 1a or 1b (see FIGS. 3 (d) and 4 (d)).

By the way, the above-mentioned partition member 3 is formed on either one of the substrates 1a and 1b, but the spraying of the charged electrophoretic particles 5 is performed on the substrate on which the partition member 3 is formed (see FIG. d)), * the substrate on which the partition member 3 is not formed (see FIG. 4 (d)). Also, in FIG. 3 (d),
Although the electrophoretic particles 5 are sprayed after the partition member 3 is formed and the partition 2 is formed, the spraying may be performed on the substrate 1a or 1b before the partition member 3 is formed. Good (not shown).

Dispersion of the charged electrophoretic particles 5 is shown in FIG. 3 (d).
As shown in FIG. 4, when the partition member 3 is formed and the partition 2 is formed on the substrate, the substrate on which the partition 2 is not formed (the substrate before the partition member 3 is formed, or FIG. Charged electrophoretic particles for each section 2 (section 2 that has already been formed or section 2 that will be formed later) regardless of the case where the partition member 3 is not formed as shown in FIG. Make the spraying amount of 5 almost equal.

Further, the placement of the electrophoretic dispersion liquid 4 in the plurality of compartments 2 is performed after the application of the large number of charged electrophoretic particles 5. The electrophoretic dispersion liquid 4 may be placed before the pair of substrates 1a and 1b are placed with a predetermined gap (see FIG. 3 (e)), and the pair of substrates 1a and 1b may be placed. It may be performed after placing 1b in a state where a predetermined gap is opened (see FIGS. 4 (e) and 4 (f)). In such a case, the charged electrophoretic particles 5 that are already arranged in substantially equal amounts in each section may move between the sections and the arrangement state may be impaired. Therefore, the first electrode 6 and the second electrode 7 (or the first electrode 16 and the second electrode 17) by applying a voltage to at least one of the electrodes to electrostatically adsorb the charged electrophoretic particles 5 to the respective compartments 2, or the electrophoretic dispersion liquid 4. When the arrangement is performed after the substrates are bonded together, the electrophoretic dispersion liquid 4 may be vaporized and injected into the gap between the substrates, and then cooled to be liquefied.

The above-mentioned spraying of the charged electrophoretic particles 5 is
As shown in FIG. 5, the charged electrophoretic particles 5 are arranged in a position facing the one substrate 1a or 1b in a state of being charged to one polarity (see reference numeral B), and the one substrate 1a or 1b is also provided. An electrostatic attraction force is generated by applying a voltage to the adsorption electrode 21 arranged in the vicinity of to charge the one substrate 1a or 1b to another polarity (a polarity different from the charging polarity of the charged electrophoretic particles 5). Then, it is preferable to use the flying adsorption by the electric field. Such distribution of the charged electrophoretic particles 5 may be performed while moving the one substrate 1a or 1b in the surface direction. Further, the voltage applied to the adsorption electrode 21 is made variable (for example, -1 kV to -2 kV).
V), it is advisable to change the spray amount of the charged electrophoretic particles 5 by adjusting the voltage. Furthermore, by adjusting the voltage applied to the adsorption electrode 21 in accordance with the movement (movement position) of the one substrate 1a or 1b, the amount of the charged electrophoretic particles 5 to be dispersed can be adjusted by the amount of the substrate 1a or 1b. It may be different depending on the position. In this case, the polarity of the voltage applied to the adsorption electrode 21 may be different from the charging polarity of the charged electrophoretic particles 5.

The adsorption electrode 21 shown in FIG. 5 is separable from the one substrate 1a or 1b, and when the charged electrophoretic particles 5 are sprayed, the back side (the substrate 1a) of the one substrate 1a or 1b is dispersed. Alternatively, it is arranged on the side opposite to the side on which the charged electrophoretic particles 5 are scattered based on 1b), but the arrangement is not limited to this. For example, as shown in FIG. 6, the first electrode 6 is formed on the one substrate 1a or 1b before the charged electrophoretic particles 5 are dispersed, and the first electrode 6 is formed on the substrate 1a or 1b. When spraying No. 5, it may be used as the adsorption electrode. That is, when the charged electrophoretic particles 5 are sprayed, a voltage is applied to the first electrode 6 so that the portion to which the charged electrophoretic particles 5 are attached has another polarity (the charge polarity of the charged electrophoretic particles 5 is different from that of the charged electrophoretic particles 5). Are charged with different polarities).

By the way, as a method for disposing the charged electrophoretic particles 5 at a position facing the one substrate 1a or 1b when spraying, the charged electrophoretic particles 5 are temporarily placed on the member 22 placed so as to face the substrate 1a or 1b. It may be possible to attach the particles electrically, but as the attachment method, a method of using the charging of the charged electrophoretic particles 5 or a method of mixing magnetic powder in the charged electrophoretic particles 5 and utilizing the magnetism thereof , There is. However, the adhesion force (adsorption force) of the charged electrophoretic particles 5 to the member 22 needs to be set so that the charged electrophoretic particles 5 can be easily separated from the member 22 by applying a voltage to the adsorption electrode 21 (or the first electrode 6). There is.

As the member 22 to which the charged electrophoretic particles 5 are temporarily attached, a drum-shaped member (hereinafter referred to as "adsorption drum") which is rotationally driven by a driving means (not shown) can be mentioned. In addition, a charged electrophoretic particle supply mechanism 23 for accommodating the charged electrophoretic particles 5 in a state of being charged to one polarity may be arranged near the member 22. Further, one substrate 1a or 1b may be moved below the member 22. Reference numeral 24 in the figure
Indicates a power source that is connected to the adsorption electrode 21 and applies a voltage.

When the adsorption drum 22 is rotated in the apparatus shown in FIG. 5, the charged electrophoretic particles 5 are electrostatically adsorbed on the surface of the adsorption drum 22 from the charged electrophoretic particle supply mechanism 23 and rotate together with the drum. When a voltage is applied to the adsorption electrode 21 in this state, the electrostatic force generated on the substrate 1a or 1b by the voltage application exceeds the adsorption force of the charged electrophoretic particles 5 on the adsorption drum 22, and the charged electrophoretic particles 5 are transferred to the substrate 1a. Or 1b
It flies toward and is attached to the substrate 1a or 1b.

Next, the effect of this embodiment will be described.

According to the present embodiment, the charged electrophoretic particles 5 are
Are arranged in substantially equal amounts in each section, so that the densities of the colors displayed by the particles are also substantially equal in each section, and the display quality of the produced display device is good.

Further, the electrophoretic dispersion liquid 4 is arranged in the plurality of compartments 2 by applying a voltage to at least one of the first electrode 6 and the second electrode 7 so that the electrophoretic particles 5 are charged into the respective compartments 2. When the electrostatic adsorption is performed in the above state, it is possible to prevent the arrangement state of the charged electrophoretic particles 5 (the arrangement state in which substantially equal amounts are arranged in each section) from being impaired.

[0038]

The present invention will be described in more detail below with reference to examples.

Example 1 In this example, the display device P ₁ shown in FIG. 1 was manufactured by the method shown in FIG.

That is, as shown in FIG. 1, the first electrode 6
Is formed on the entire surface of one substrate 1b, and its first electrode 6
An insulating layer 8, a second electrode 7, and an electrode protective layer 9 were sequentially formed on the surface of the.

Polyethylene terephthalate (PET) was used for the substrates 1a and 1b, and Al was used for the first electrode 6 so that it also functions as a reflection layer. The insulating layer 8 is made of acrylic resin mixed with alumina fine particles to have a function as a scattering layer.
For this, TiC that exhibits a dark black color was used. Further, the partition wall (partition wall member) 3 is made of silicone rubber, and the electrophoretic particles 5 are mainly composed of polystyrene, which is mixed with carbon and a charge control agent (particle size 2 μm) and has a negative polarity. The one charged to was used. A transparent silicone oil was used as the electrophoretic dispersion liquid 4.

Next, regarding the manufacturing method of the display device P ₁ ,
This will be described with reference to FIG.

When manufacturing the display device P ₁ , the first electrode 6 is formed on the entire surface of the one substrate 1b, and the electrode 6 is formed.
An insulating layer 8 was formed on the surface of the (see FIG. 3 (a)). Further, a TiC film is formed on the surface of the insulating layer 8 to form each partition 2
70% of each of the above was removed by patterning to form the second electrode 7 in a dot shape (see FIG. 2B). Then, the electrode protective layer 9 was formed on the surface of the second electrode 7, and the partition walls 3 were pattern-formed on the surface thereof (see FIG. 3C).

Next, using the spraying device shown in FIG. 6, the charged electrophoretic particles 5 were sprayed in equal amounts in each of the compartments 2 (see FIG. 6 (d)).

Then, a voltage of 70 V is applied between the first electrode 6 and the second electrode 7 to electrostatically adsorb the charged electrophoretic particles 5 to the respective compartments 2, and the electrophoretic dispersion liquid 4 is applied to each of them. It was injected into the compartment 2 (see FIG. 2 (e)), and the substrates 1a and 1b were bonded together with the voltage applied (FIG. 2 (f)).
reference).

Display device P ₁ created as described above
Was driven by applying a voltage of 40 V to the electrodes 6 and 7, the contrast was 5 and the response speed was 20 msec.
A good display of was obtained. Since the charged electrophoretic particles 5 are negatively charged, as shown in FIG.
When a negative voltage is applied to the first electrode 6 and a positive voltage is applied to the first electrode 6, the charged electrophoretic particles 5 gather in the portion where the first electrode 6 is exposed. In this embodiment, since the second electrode 7 and the charged electrophoretic particles 5 are both black, black display is performed.

Further, no density variation was observed between the sections, and the display quality was good.

Example 2 In this example, the display device P ₂ shown in FIG. 2 was manufactured by the method shown in FIG.

That is, as shown in FIG. 2, the first electrode 1
6 is formed on the entire surface of one substrate 1a, the second electrode 17 is formed in a dot shape for each section on the other substrate 1b, and the insulating layer 8 is formed on the surfaces of the electrodes 16 and 17, respectively. Further, the first electrode 16 is provided on the partition wall (partition member) 3.
At a position near the second electrode 17 and away from the through hole 3
a was formed so that each section 2 was communicated. The size of the through hole 3a was such that only the electrophoretic dispersion liquid 4 could move from the compartment 2 to the other compartment 2 and the charged electrophoretic particles 5 could not move.

For the substrates 1a and 1b, polyether sulfone (PES) having a gas barrier layer is used, ITO is used for the first electrode 16 and Ti is used for the second electrode 17.
Was used. Acrylic resin was used for the insulating layer 8 and polyimide resin was used for the partition walls 3. Further, as the charged electrophoretic particles 5, white particles (particle diameter 3 μm) in which titanium oxide particles are coated with a polymer containing a charge control agent and which are positively charged are used. A silicone oil colored blue with a blue pigment was used.

Next, regarding the manufacturing method of the display device P ₂ ,
This will be described with reference to FIG.

When manufacturing the display device P ₂ , the first electrode 16 is formed on the entire surface of the one substrate 1a (see FIG.
(See (a)), and the insulating layer 8 was formed on the surface of the electrode 16. Further, on the surface thereof, a through hole forming resist pattern 18 is formed in a line shape from the substrate end portion to the substrate end portion,
Further, the partition wall 3 was patterned so as to cover the resist pattern 18. After that, the through hole forming resist pattern 18 was dissolved and removed, and the through holes 3a were formed in the partition walls 3 (see FIG. 2B).

Next, the second electrode 1 is formed on the surface of the other substrate 1b.
7 was patterned, and an insulating layer 8 was formed on the surface (see FIG. 7C).

Next, using the spraying device shown in FIG. 6, the charged electrophoretic particles 5 were sprayed on the substrate 1b (so that the sprayed amount in each of the sections 2 formed later would be substantially equal) (see FIG. 6).
(See (d)).

Thereafter, the substrates 1a and 1b are bonded to each other (see (e) in the same figure), and the gap between the substrates is sealed with a sealant 19 to prevent leakage and evaporation of the electrophoretic dispersion liquid 4. (See (f) in the figure).

It should be noted that the sealant 19 is provided with openings at two separate positions (not shown), and the air remaining in the substrate gap is sucked from one opening to reduce the pressure. ,
The electrophoretic dispersion liquid 4 was injected from the other opening. As a result, the electrophoretic dispersion liquid 4 is filled in the respective compartments 2 through the through holes 3a. At this time, a voltage is applied to the second electrode 17,
The charged electrophoretic particles 5 were attracted to a position away from the through holes 3a so that the charged electrophoretic particles 5 did not block the through holes 3a and hinder the injection of the electrophoretic dispersion liquid 4.

In the display device P ₂ thus produced, the first electrode 16 is grounded to the reference potential, and the second electrode 1
A positive or negative voltage was selectively applied to No. 7. When a negative voltage is applied to the second electrode 17, the positively charged charged electrophoretic particles 5 gather to cover the second electrode 17 as shown in FIG. In this case, when the display device P ₂ is viewed from the direction of the arrow A in the figure, only the electrophoretic dispersion liquid 4 colored in blue is visually recognized, the charged electrophoretic particles 5 are not visually recognized, and blue display is performed. . Also, the second
When a positive voltage is applied to the electrode 17, the positively charged charged electrophoretic particles 5 are separated from the second electrode 17 and gather on the side of the first electrode 16. In this case, when viewing the display device P ₂ from the direction of the arrow A shown in the figure, only the charged electrophoretic particles 5 colored in white are visually recognized, and the electrophoretic dispersion liquid 4 is not visually recognized, and white display is performed. .

When the present inventor actually applied a voltage of 70 V to drive the display device P ₂ , a good display with a contrast of 4 and a response speed of 200 msec was obtained. Further, no variation in density was observed between the sections, and the display quality was good.

[0059]

As described above, according to the present invention,
Since the charged electrophoretic particles are arranged in substantially equal amounts in each section, the density of the color displayed by the particles is also substantially equal in each section, and the display quality of the produced display device is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the configuration of a display device manufactured by the present invention.

FIG. 2 is a cross-sectional view showing another example of the configuration of the display device manufactured by the present invention.

FIG. 3 is a schematic view showing an example of a method of manufacturing a display device according to the present invention.

FIG. 4 is a schematic view showing another example of the method for manufacturing the display device according to the present invention.

FIG. 5 is a diagram for explaining a process and an apparatus for spraying charged electrophoretic particles.

FIG. 6 is a diagram for explaining a process and a device for spraying charged electrophoretic particles.

FIG. 7 is a diagram showing a structure and an operating principle of an electrophoretic display device.

[Explanation of symbols]

1a, 1b Substrate 2 Partition 3 Partition (partition member) 4 Dispersion liquid 5 Electrophoretic particles 6 First electrode 7 Second electrode 16 First electrode 17 Second electrode 21 Adsorption electrode P ₁ Display device P ₂ Display device

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-53-108508 (JP, A) JP-A-49-24695 (JP, A) JP-A-10-260589 (JP, A) JP-A-2- 223935 (JP, A) JP-A-1-248183 (JP, A) JP-B 47-35842 (JP, B1) JP-A 8-502599 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09F 9/37 311

Claims (10)

(57) [Claims] 1. A pair of substrates arranged with a predetermined gap therebetween, a partition member arranged so as to divide the predetermined gap into a plurality of partitions along the surface of the substrate, and a plurality of these partitions. Dispersion liquid and a large number of charged electrophoretic particles, which are respectively disposed on the first and second electrodes, and a second electrode and a second electrode that are arranged so as to face the electrophoretic dispersion liquid and the electrophoretic migration particles in each section.
In a display device manufacturing method for manufacturing a display device including electrodes, an amount of each section is substantially equal to one of the pair of substrates before being placed with a predetermined gap. The plurality of charged electrophoretic particles are arranged so as to be equal to each other , and the electrophoretic dispersion liquid is arranged such that
A method for manufacturing a display device, which is performed after the arrangement . 2. The arrangement of the charged electrophoretic particles is such that the charged electrophoretic particles are charged to one polarity and face the one substrate , and the one substrate is charged to another polarity. fly by an electric field to generate an electrostatic attraction force by
The method for manufacturing a display device according to claim 1, wherein the method is carried out by utilizing the adsorption of light . 3. The charging of the one substrate is performed in the vicinity of the one substrate.
The method of manufacturing a display device according to claim 2, wherein a voltage is applied to a suction electrode arranged nearby.
Law. 4. The method for manufacturing a display device according to claim 3 , wherein the amount of the charged electrophoretic particles arranged in each section is changed by adjusting the voltage applied to the adsorption electrode. 5. The voltage applied to the adsorption electrode is adjusted according to the movement of the one substrate , so that the amount of the charged electrophoretic particles to be arranged in each section is changed according to the position of the substrate. The method for manufacturing a display device according to claim 4, wherein. 6. The adsorption electrode is separable from the one substrate and is arranged on the back side of the one substrate when the charged electrophoretic particles are arranged . A method for manufacturing the display device according to any one of items . 7. The first electrode comprises each of the charged electrophoretic particles.
Wherein formed on one substrate and before placing the partition, the one
The method for manufacturing a display device according to claim 2 , wherein the substrate is charged by applying a voltage to the first electrode . Arrangement according to claim 8, wherein the electrophoretic particles, a method of manufacturing a display device according to any one of claims 1 to 7, characterized in said performed while moving one of the substrate in a planar direction thereof, it . Arranged to 9. wherein the plurality of compartments of the dispersion liquid is more of claims 1 to 8 wherein the pair of the substrates performed before placing with a predetermined spacing, characterized in that 2. A method of manufacturing a display device according to item 1. 10. The arrangement of the electrophoretic dispersion liquid in the plurality of compartments is performed by applying a voltage to at least one electrode of the first electrode and the second electrode to statically charge the electrophoretic particles in each compartment. The method for manufacturing a display device according to claim 9 , wherein the method is performed in a state of being electro-adsorbed.