JP2000322003A - Manufacture of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve display quality by eliminating dispersion in display density between respective picture elements. SOLUTION: When leaving charged electrophoretic particles 5 charged, by applying a voltage of appropriate polarity to electrodes 6, 7, the charged electrophoretic particles 5 can be distributed to a position shown in Fig. When the electrodes 7 and the charged electrophoretic particles 5 are colored in the same color, the color is displayed. By doing such displaying separately at each of picture elements 2, an optional image can be displayed. In the manufacturing process, before placing one-side substrate 1a and after forming barrier ribs 3, the charged electrophoretic particles 5 are distributed to each of the picture element 2 by dripping an equal quantity of a dispersing liquid 4 for electrophoresis in which the charged electrophoretic particles 5 are uniformly dispersed. Consequently, because each of the picture elements 2 has an equal quantity of the charged electrophoretic particles 5, dispersion in display density between the picture elements 2 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] One such display device is Har.
old D. An electrophoretic display device proposed by Lees et al. (US Pat. No. 3,612,758) is known. Figure 6 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 arranged with a predetermined spacing has a 1b, each 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 charged and colored positively and an electrophoretic dispersion liquid 4 in which a dye is dissolved and colored in a different color from the charged electrophoretic particles 5 are provided. The partition 3 is further disposed, and a large number of pixels 2 along the surface direction of the substrate are formed in the gap.
(Only one pixel is shown in the figure) to prevent the uneven distribution of the charged electrophoretic particles 5 and to define the gap between the substrates.

In such a display device P ₃ , FIG.
As shown in (a), when a negative voltage is applied to the lower electrode 37 in the figure and a positive voltage is applied to the upper electrode 36 in the figure, the positively charged charged electrophoretic particles 5 are moved downward. When the display is viewed from the direction A in the drawing, the same color as the electrophoretic dispersion liquid 4 is displayed. Conversely, when a positive voltage is applied to the lower electrode 37 and a negative voltage is applied to the upper electrode 36 as shown in FIG. The migrating particles 5 gather so as to cover the upper electrode 36, and when the display device is viewed from the direction A in the drawing, the same color as the charged migrating particles 5 is displayed. By performing such driving in units of pixels, an arbitrary image is displayed by a large number of pixels.

Meanwhile, in the display device P ₃ as described above, it is desirable color density of each pixel 2 is substantially uniform. For this purpose, the electrophoretic particles 5 should be located by an amount approximately equal for each pixel There is a need. As a manufacturing method therefor, there is the following method. That is, according to the method disclosed in JP-A-64-86117, the partition walls 3 are made of a material which swells (increases in volume) by being immersed in the electrophoretic dispersion 4, and Is not swollen, the electrophoretic dispersion liquid 4 is injected together with the charged electrophoretic particles 5, and then the partition wall 3
Swelling to form a pixel 2 or a method disclosed in JP-A-2-223935, in which a partition 3 is formed on one of the substrates 1a or 1b, and the charged electrophoretic particles 5 are dispersed therein. A method of immersing the flexible film 4 in the dispersed liquid 4 and sequentially pressing the flexible film (the other substrate) in that state.

[0006]

However, even if the above method and the above method are used, there is a limit in arranging the charged electrophoretic particles 5 in substantially equal amounts for each pixel, and the color density of each pixel 2 is limited. There is a problem that the display quality is not equal and the display quality is deteriorated.

The reason why the charged electrophoretic particles 5 cannot be arranged in substantially the same amount for each pixel is as follows. That is, in the method described above, 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. However, since the charged electrophoretic particles 5 are charged, the injection is performed. This is because the particles adhere to the surface of the substrate or the partition wall 3 on the upstream side in the direction and do not reach every corner of the substrate gap, and the density of the charged electrophoretic particles 5 is high on the upstream side in the injection direction and low on the downstream side in the injection direction. . Further, in the above method, the dispersion liquid 4 of each pixel is dispersed for various reasons (for example, when there is a difference in the height of the partition walls 3 or when the flexible film is sequentially pressed and compressed). This is because the amount differs, and accordingly, the amount of the charged electrophoretic particles 5 does not become equal for each pixel.

Accordingly, an object of the present invention is to provide a method for manufacturing a display device which prevents deterioration of display quality.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a structure in which a pair of substrates arranged with a predetermined gap therebetween is formed, and the predetermined gap is formed along the surface of the substrate. Partition members arranged so as to be divided into a plurality of pixels, electrophoretic dispersion liquid and a large number of charged electrophoretic particles respectively arranged in the plurality of pixels, and these electrophoretic dispersion liquid and charged electrophoretic particles in each pixel A first electrode and a second electrode disposed so as to face each other, and a display device manufacturing method for manufacturing a display device, comprising: A plurality of pixels are formed by arranging the partition member on one substrate, and thereafter, a liquid in which the large number of charged electrophoretic particles are dispersed is injected into each of the pixels by an approximately equal amount. I do.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, a display device manufactured according to the present invention comprises a pair of substrates 1a and 1b arranged with a predetermined gap therebetween, and the predetermined gap between the substrates 1a and 1b.
a partition member 3 arranged so as to be divided into a plurality of pixels 2 along the planes a and 1b, an electrophoretic dispersion liquid 4 and a large number of charged electrophoretic particles 5 arranged in each of the plurality of pixels 2
And a first electrode 6 disposed for each pixel 2 so as to face the electrophoretic dispersion 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). The charged electrophoretic particles 5 are charged to a predetermined polarity.

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

When the first electrode 6 and the second electrode 7 are supported on the same substrate 1b, the first electrode 6 is opposed to the electrophoretic dispersion liquid 4 in each pixel 2 as shown in FIG. The area S ₁ (hereinafter, referred to as “exposed area S ₁ of the first electrode 6”) of the (exposed) portion is made larger than the exposed area S ₂ of the second electrode 7. 6 colors the portion facing the electrophoretic dispersion 4 in a first color (for example, white or colorless and transparent when the display device is of a transmissive type), and charges the charged electrophoretic particles 5 with a second color. It is good to color it (for example, black). Here, the first color may be 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 protection film) may be colored. In such a case, as shown in FIG. 1, the second color (for example, black) is displayed in the pixel 2 in which the charged electrophoretic particles 5 gather so as to cover the first electrode 6, and the second color is displayed.
The display of the first color (for example, white) is performed in the pixels 2 gathered so as to cover the electrode 7. By the way, the display contrast in this case is the first electrode 6 and the second electrode 6.
The contrast largely depends on the exposed area ratio of the electrode 7 (= the exposed area of the second electrode 7 / the exposed area of the first electrode 6). The contrast becomes smaller as the exposed area ratio becomes larger, and the contrast becomes smaller as the exposed area ratio becomes smaller. growing. In order to realize a large contrast, the exposed area ratio is preferably set to about 1/2 to 1/4. Note that in FIG. 1, the first electrode 6 is
The electrodes 7 are arranged so as to be overlapped with each other and the insulating layer 8 is arranged between them so as to be insulated. However, the present invention is not limited to this, and the electrodes 6 and 7 may be arranged so as not to overlap each other. .

On the other hand, as shown in FIG. 2, when the first electrode 16 and the second electrode 17 are supported on separate substrates 1a and 1b, at least one of the electrodes 16 (the electrode arranged on the observer side) is used. 16) is made transparent and is formed on almost the entirety of the pixel 2 (although it is not always necessary to form it on the entire substrate, but at least on almost the entirety of the pixel 2), and the electrophoretic dispersion liquid 4 is formed in the first color (for example , Blue) and the electrophoretic particles 5 are colored in a second color (for example, black). In such a case, as shown in FIG.
In the pixel 2 but gathered so as to cover the electrodes 17, viewing the display device P ₂ in the direction of the arrow A shown, the electrophoretic particles 5 only dispersion liquid 4 is visible is not visible,
The first color display is performed by the electrophoretic dispersion liquid 4. Further, in the pixel 2 in which the charged electrophoretic particles 5 are gathered so as to cover the electrode 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 such a 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 that at least one of the electrodes 16 is formed over almost the entire pixel 2 as described above. From the viewpoint of display contrast, the two electrodes 16, 1
It is not necessary to adjust the exposure area ratio of 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. For example, both electrodes 16 and 17 are formed on almost the entire pixel 2. You may do it.

By the way, regardless of whether the first electrodes 6, 16 and the second electrodes 7, 17 are supported on the same substrate 1b, or whether they are supported on separate substrates 1a, 1b, these electrodes 6 , 7, 16, 17 may or may not be formed to be in contact with the substrates 1a, 1b. Further, on the surfaces of these electrodes 6, 7, 16 and 17, an insulating layer 8, an electrode protection layer 9 and a black matrix pattern may be formed as necessary. Further, the gap between the substrates may be sealed with an adhesive 19.

Further, the first electrode 6 and the second electrode 7 described above are used.
(Or the polarity of the potential difference between the first electrode 16 and the second electrode 17) can be changed independently in each pixel 2. The method includes: * Both the first electrode 6 and the second electrode 7 (or the first electrode 1
6 and the second electrode 17) in each pixel 2 in the form of a dot, and applying a voltage of an arbitrary polarity to each of the electrodes 6, 7 or 16, 17 (not shown); As shown in FIGS. 1 and 2, one of the electrodes 6, 16 is formed over substantially the entire substrate 1a or 1b to be a common electrode, and the other electrodes 7, 17 are formed in dots for each pixel 2. Then, one of the electrodes 6 and 16 serving as the common electrode is maintained at a reference potential by, for example, grounding, and a voltage of an arbitrary polarity is 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 usually about several tens V is required.

On the other hand, the display device P ₁ may be of a transmission type or a reflection type. The arrow A shown in FIG.
When the observation is made from the direction of the first electrode 6 shown in FIG.
, The use of a transparent electrode such as ITO (indium tin oxide) in the case of a transmission type display device P _1,
It may be used a metal electrode such as Al in the case of the display device P ₁ and the reflection type. Further, the first electrode 6 shown in FIG.
The display device P ₂ may be formed using a transparent electrode such as ITO (indium tin oxide).

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

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

On the other hand, general glass can be used for the substrates 1a and 1b, but in order to make the display device flexible, polyethylene terephthalate (PET) is used.
Or a plastic film such as polyethersulfone (PES).

In addition, silicone rubber,
Fluorine rubber, acrylic rubber, or other photosensitive resin may be used.

Further, the charged electrophoretic particles 5 are mainly composed of a polymer resin such as polystyrene or polyethylene, mixed with a coloring agent such as carbon, or a pigment such as titanium oxide or aluminum oxide. Those coated with a polymer resin can be suitably used. If necessary, a charge control agent or the like may be mixed, and the particle size is preferably 0.1 to 50 μm.

Further, as the electrophoretic dispersion liquid 4, it is preferable to use a liquid in which the charged electrophoretic particles 5 are well charged and have a low viscosity, and specific examples thereof include silicone oil, xylene, toluene, and isoparaffinic petroleum solvents. May be used.
Further, as the electrophoresis dispersion liquid 4, if necessary, a substance having a large specific gravity is used, and the specific gravity of the electrophoresis dispersion liquid 4 and the charged electrophoretic particles 5
Should be approximately equal to the specific gravity.

It should be noted that a plurality of adjacent pixels 2 may display different colors, and a full-color image may be displayed by a combination of these colors.

Next, a method of manufacturing the display devices P ₁ and P ₂ will be described with reference to FIGS. 3, 4 and 5.

In manufacturing the display devices P ₁ and P ₂ , _{one of} the pair of substrates 1 a and 1 b must be placed before the pair of substrates 1 a and 1 b are arranged with a predetermined gap therebetween. A plurality of pixels 2 are formed by disposing the partition member 3 on 1a or 1b (FIGS. 3A, 4A, and 5A).
reference).

Next, the liquid L in which the large number of charged electrophoretic particles are dispersed is injected into each of the pixels 2 in substantially equal amounts (see FIGS. 3 (b), 4 (b) and 5 (b)). ). The injection of the liquid L may be performed using the nozzle N as shown in each drawing. Further, as the liquid L, the above-mentioned electrophoretic dispersion 4
(See FIGS. 3 and 5), or a volatile liquid (eg, alcohol) other than the electrophoretic dispersion may be used (see FIG. 4). Further, by controlling the amount of the liquid L, the amount of the charged electrophoretic particles 5 per pixel unit area may be made constant.

When the electrophoretic dispersion liquid 4 is used as the liquid L, the electrophoretic dispersion liquid 4 in which the plurality of charged electrophoretic particles 5 are dispersed is injected into each of the pixels 2.
Before disposing the pair of substrates 1a and 1b with a predetermined gap therebetween, the electrophoretic dispersion liquid 4 not containing the charged electrophoretic particles 5 may be disposed on each of the pixels 2 (FIG. 3 (d) and FIG. (See FIG. 5 (d)).

When a volatile liquid other than the electrophoretic dispersion liquid is used as the liquid, the liquid L is injected together with the charged electrophoretic particles 5 into each of the pixels 2.
Before disposing the pair of substrates 1a and 1b with a predetermined gap therebetween, heat or the like is applied to volatilize the liquid L (FIG. 4).
After that, the electrophoretic dispersion liquid 4 is preferably disposed on each of the pixels 2 (see FIG. 4D).

By the way, the above-mentioned arrangement of the electrophoretic dispersion liquid 4 (in the production method of FIGS. 3 and 4, the charged electrophoretic particles 5
May be performed after the pair of substrates 1a and 1b are arranged with a predetermined gap therebetween.

When the above-described arrangement of the electrophoretic dispersion liquid 4 (the arrangement of the electrophoretic dispersion liquid 4 containing no charged electrophoretic particles 5 in the manufacturing method of FIGS. Charged electrophoretic particles 5 arranged in substantially equal amounts each time
May move between each pixel and the arrangement state may be impaired. * A voltage is applied to at least one of the first electrode 6 and the second electrode 7 (or the first electrode 16 and the second electrode 17). Is applied, the charged electrophoretic particles 5 are electrostatically adsorbed to each pixel 2, or * when the electrophoretic dispersion liquid 4 is arranged after the substrates are bonded to each other, the vapor of the electrophoretic dispersion liquid 4 is vaporized. It is better to inject into the gap between the substrates and then cool and liquefy.

Next, effects of the present embodiment will be described.

According to the present embodiment, the charged electrophoretic particles 5 are arranged in each pixel 2 by injecting a substantially equal amount of the liquid L in which a large number of charged electrophoretic particles are dispersed into each pixel 2. Will be Therefore, the charged electrophoretic particles 5 are arranged in substantially equal amounts for each pixel, and as a result, the density of the color displayed by the particles is also substantially equal for each pixel, and the display quality of the display device produced is reduced. It will be good.

The arrangement of the electrophoretic dispersion liquid 4 on the plurality of pixels 2 is performed by applying a voltage to at least one of the first electrode 6 and the second electrode 7 to cause the charged electrophoretic particles 5 to move to the respective pixels 2. In the case where the electrostatic adsorption is performed, it is possible to prevent the arrangement state of the charged electrophoretic particles 5 (the arrangement state in which the charged electrophoretic particles 5 are arranged in substantially equal amounts for each pixel) from being damaged.

[0036]

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

[0037] Example 1 In this example, the display device P ₁ shown in FIG. 1 was prepared by the method shown in FIG.

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

Note that polyethylene terephthalate (PET) was used for the substrates 1a and 1b, and Al was used for the first electrode 6 to serve also as a reflection layer. The insulating layer 8 is made of an acrylic resin mixed with alumina fine particles and provided with a function as a scattering layer.
Used was TiC exhibiting a dark black color. Further, the partition wall (partition member) 3 is made of silicone rubber, and the charged electrophoretic particles 5 are made of polystyrene as a main component, mixed with carbon and a charge control agent (particle diameter 1 μm), and Was used. In addition, a transparent silicone oil was used for the electrophoresis dispersion liquid 4.

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

[0041] In manufacturing a display device P ₁ forms a first electrode 6 on the entire surface of one substrate 1b, the electrode 6
An insulating layer 8 was formed on the surface (see FIG. 3A). Further, a TiC film is formed on the surface of the insulating layer 8 so that each pixel 2
The second electrode 7 was formed in a dot shape by removing a portion of 70% by patterning. Then, an electrode protection layer 9 was formed on the surface of the second electrode 7, and the partition walls 3 were pattern-formed on the surface.

Next, using the small-diameter nozzle N, the electrophoretic dispersion liquid 4 in which the charged electrophoretic particles 5 were uniformly dispersed was injected into each pixel 2 in an equal amount (see FIGS. 4B and 4C). Specifically, the electrophoretic dispersion liquid 4 in which the charged electrophoretic particles 5 were uniformly dispersed was physically projected as a droplet by piezo driving, and the droplet was dropped on each pixel 2. During this time, the first electrode 6 and the second electrode 6
A voltage of 70 V was applied between the electrode 7.

Thereafter, a voltage of 70 V is applied between the first electrode 6 and the second electrode 7 so that the charged electrophoretic particles 5 are electrostatically adsorbed to each pixel 2, and then the electrophoretic dispersion liquid 4 (charged A dispersion liquid 4) containing no electrophoretic particles 5 was additionally injected into each pixel 2 (see FIG. 3 (d)).

Next, the adhesive 1 is applied to one of the substrates 1a or 1b.
9 and apply the same voltage to the substrates 1a, 1
b was bonded (see FIG. 3E).

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

No variation in density between the pixels was observed, and the display quality was good.

[0047] In Example 2 In this example, the display device P ₁ shown in FIG. 1 was prepared by the method shown in FIG.

That is, when the charged electrophoretic particles 5 are arranged on each pixel 2, a dispersion of the charged electrophoretic particles 5 in alcohol L as a liquid is applied to each pixel 2 using a nozzle N.
(See FIG. 4 (b)).

Thereafter, before disposing the pair of substrates 1a and 1b with a predetermined gap therebetween, the alcohol L is sufficiently volatilized (see FIG. 3 (c)).
Was injected into each of the pixels 2 (see FIG. 4D). The injection of the electrophoretic dispersion liquid 4 was performed with a voltage applied to the electrodes 6 and 7.

The manufacturing method and configuration other than those described above were the same as those in the first embodiment.

The display device P ₁ created as described above.
Was driven by applying a voltage of 40 V to the electrodes 6 and 7, and the contrast was 5 and the response speed was 20 msec.
Was obtained.

No variation in density between the pixels was observed, and the display quality was good.

[0053] Example 3 In this example, the display device P ₂ shown in FIG. 2, was prepared by the method shown in FIG.

That is, as shown in FIG.
6 was formed on the entire surface of one substrate 1a, the second electrode 17 was formed in dots on the other substrate 1b for each pixel, and an insulating layer 8 was formed on the surface of each electrode 16, 17.

The substrates 1a and 1b are made of polyethersulfone (PES) on which a gas barrier layer is formed, and the first electrode 16 is made of ITO, and the second electrode 17 is made of Ti.
Was used. Acrylic resin was used for the insulating layer 8 and polyimide resin was used for the partition 3. Further, as the charged electrophoretic particles 5, a white particle (particle diameter: 2 μm) in which titanium oxide particles are coated with a polymer containing a charge controlling agent and charged positively is used. Silicone oil colored blue with a blue pigment was used.

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

[0057] In manufacturing a display device P ₂ forms a first electrode 16 on the entire surface of one substrate 1a (FIG
(a)), an insulating layer 8 is formed on the surface of the electrode 16,
Further, a partition 3 was formed on the surface of the insulating layer 8 by patterning.

Next, using the small-diameter nozzle N, the electrophoretic dispersion liquid 4 in which the charged electrophoretic particles 5 are uniformly dispersed is injected into each pixel 2 in the same amount as in the first embodiment (see FIG. b)
(c)), in a state where a voltage was applied in the same manner as in Example 1,
The electrophoretic dispersion liquid 4 (the dispersion liquid 4 in a state where the charged electrophoretic particles 5 are not contained) was further injected into each pixel 2 (see FIG.
(d)).

The second electrode 17 is provided on the surface of the other substrate 1b.
And an insulating layer 8 was formed on the surface.

Thereafter, these substrates 1a and 1b were bonded together using an adhesive 19 (see FIG. 3E).

In the display device P ₂ thus prepared, the first electrode 16 is grounded to a reference potential, and the second electrode 1
7, a positive or negative voltage was selectively applied. When a negative voltage is applied to the second electrode 17, the charged electrophoretic particles 5 charged to a positive polarity gather so as to cover the second electrode 17 as shown in FIG. In this case, looking at the display device P ₂ in the direction of the arrow A shown, the electrophoretic particles 5 only dispersion liquid 4 colored in blue is visible not visible, so that the blue display is performed . Also, the second
When a positive voltage is applied to the electrode 17, the charged electrophoretic particles 5 charged to the positive polarity separate from the second electrode 17 and collect on the first electrode 16 side. In this case, looking at the display device P ₂ in the direction of the arrow A shown, the dispersion liquid 4 only charged electrophoretic particles 5 that are colored white is visible is not visible, so that the white color display is performed .

When the present inventor actually drives the display device P ₂ by applying a voltage of 70 V, a favorable display with a contrast of 4 and a response speed of 200 msec was obtained. Further, no density variation between the pixels was observed, and the display quality was good.

[0063]

As described above, according to the present invention,
The arrangement of the charged electrophoretic particles in each pixel is performed by injecting a liquid in which a large number of charged electrophoretic particles are dispersed into each of the pixels in substantially equal amounts. Therefore, the charged electrophoretic particles are arranged in substantially equal amounts for each pixel,
As a result, the density of the color displayed by the particles becomes substantially equal for each pixel, and the display quality of the produced display device is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a 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 illustrating an example of a method for manufacturing a display device according to the present invention.

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

FIG. 5 is a schematic view showing still another example of the method for manufacturing a display device according to the present invention.

FIG. 6 is a diagram illustrating a structure and an operation principle of an electrophoretic display device.

[Explanation of symbols]

1a, 1b substrate 2 pixel 3 partition (partition member) 4 electrophoretic dispersion 5 charged electrophoretic particles 6 first electrode 7 second electrode 16 first electrode 17 second electrode 21 adsorption electrode P ₁ display P ₂ display

Claims (8)

[Claims] 1. A pair of substrates arranged with a predetermined gap therebetween, a partition member arranged to divide the predetermined gap into a plurality of pixels along a surface of the substrate, and a plurality of the pixels And a first electrode and a second electrode, which are arranged to face the electrophoretic dispersion and the charged electrophoretic particles at each pixel.
An electrode, and a display device manufacturing method for manufacturing the display device, comprising: a plurality of pixels, wherein the partition member is arranged on one of the pair of substrates before being arranged with a predetermined gap therebetween. And thereafter, a liquid in which the large number of charged electrophoretic particles are dispersed is:
A method for manufacturing a display device, wherein substantially equal amounts are injected into each of the pixels. 2. The method for manufacturing a display device according to claim 1, wherein the injection of the liquid in which the plurality of charged electrophoretic particles are dispersed is performed using a nozzle. 3. The method for manufacturing a display device according to claim 1, wherein the liquid is the electrophoretic dispersion liquid. 4. The method according to claim 1, wherein after the dispersion liquid for electrophoresis in which the plurality of charged electrophoretic particles are dispersed is injected into each of the pixels and before the pair of substrates are arranged with a predetermined gap therebetween, The method for manufacturing a display device according to claim 3, wherein a dispersion liquid for electrophoresis containing no electrophoretic particles is arranged in each of the pixels. 5. An arrangement of the electrophoretic dispersion liquid not containing the charged electrophoretic particles, wherein a voltage is applied to at least one of the first electrode and the second electrode to cause the charged electrophoretic particles to be disposed in each pixel. The method according to claim 4, wherein the method is performed in a state in which the display device is electrostatically attracted. 6. The method according to claim 1, wherein the liquid is a volatile liquid. 7. After the liquid is injected into each of the pixels together with the charged electrophoretic particles, and before disposing the pair of substrates with a predetermined gap therebetween, the liquid is volatilized. The method for manufacturing a display device according to claim 6, wherein a dispersion liquid for electrophoresis is arranged in each of the pixels. 8. The arrangement of the electrophoretic dispersion liquid includes applying a voltage to at least one of the first electrode and the second electrode to electrostatically adsorb the charged electrophoretic particles to each pixel. The method according to claim 7, wherein the method is performed in a state.