JP2000330142A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of decreasing display irregularity and also reducing the production cost. SOLUTION: An insulating liquid 1 and color charged particles 2 which move in the direction to a first electrode 8 or a second electrode 7 by the voltage applied to the first electrode 8 and the second electrode 7 are filled in a tube 3 having light-transmissive property. These tubes filled with the insulating liquid 1 and color charged particles 2 are arranged between a first substrate 4 having the first electrode 8 and a light-transmissive second substrate 6 having the light-transmissive second electrode 7 in tight contact with them so that the color charged particles 2 can be uniformly dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device,
In particular, the present invention relates to an electrophoretic display device that performs display by moving charged particles in a liquid by a voltage applied to an electrode.

[0002]

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

However, in this liquid crystal display device, it is difficult to see characters on the screen due to the angle at which the screen is viewed and reflected light,
The burden on vision caused by flickering and low brightness of the light source has not been sufficiently solved. For this reason, research on a display device with a small burden on vision has been actively studied.

[0004] In view of such low power consumption and reduced burden on the eyes, a reflection type display device is expected.
An electrophoretic display device is known as one of them. Here, the electrophoretic display device includes a dispersion layer composed of charged electrophoretic particles 31 and an insulating liquid 32 as shown in FIG.
A pair of electrodes 33 and 34 facing each other with the dispersion layer interposed therebetween is provided. By applying a voltage to the dispersion layer through the electrodes 33 and 34, the migrating particles 31 are opposite to the electric charges of the particles themselves. I try to draw to the side.

The electrophoretic display device can perform color display by coloring the electrophoretic particles 31 and dyeing the insulating liquid 32. That is, as shown in (b) of the figure, when the colored migrating particles 31 which are colored charged particles adhere to the surface of the first electrode 33 close to the observer, the color of the migrating particles 31 is displayed, and the color of the migrating particles 31 is displayed. As shown in (a), when the ink adheres to the second electrode surface 34 far from the observer, the color of the stained insulating liquid 32 is displayed.

By the way, in the electrophoretic display device having such a configuration, when the electrophoretic display device is used repeatedly for a long time, the electrophoretic particles
There is a possibility that a bias occurs in the density distribution of No. 1, resulting in display unevenness. Therefore, as a method for preventing such a bias in the concentration distribution, for example, as proposed in Japanese Patent Application Laid-Open No. 59-34518 or Japanese Patent Application Laid-Open No. 2-284124, partition walls are provided at regular intervals in the sealing portion. There is a method of forming and dividing into small sections.

Further, as disclosed in Japanese Patent Application Laid-Open No. 1-114828, for example, a porous system composed of a member which swells with a dispersion medium is used, and after the dispersion system is injected, it is divided into discontinuous small sections. There is a way. Here, in this proposal, a plurality of light-transmissive tubes pre-filled with liquid and migrating particles are arranged between the substrates. Since the tubes themselves can serve as partitions, it is unnecessary to form partitions.

As a display device having a structure in which a light-transmitting tube is arranged between substrates, there is a liquid crystal display device proposed in Japanese Patent Application Laid-Open No. 49-96694. This has been proposed as a display device having a configuration in which tubes filled with a liquid crystal material are arranged in parallel, having a uniform thickness, and capable of preventing entry of moisture, gas, and the like from the outside.

[0009]

However, in such a conventional electrophoretic display device, as described above, in order to prevent display unevenness due to the uneven distribution of the concentration of the migrating particles, a partition is formed in the enclosing portion. In this method, the electrophoretic particles must be evenly distributed to each of the small compartments, and the distribution is difficult. In addition, there is a problem that a lot of time and cost are required for a series of manufacturing steps which require formation of partition walls on the substrate, uniform distribution of the electrophoretic particles and the insulating liquid, and sealing.

Further, in the case of performing color display, since electrophoretic particles or insulating liquids of a plurality of colors are used, even when divided into small sections by partition walls, mixing tends to occur in adjacent sections at the time of manufacturing, and a desired color is obtained. It was difficult to fill only the electrophoretic particles of color or the insulating liquid. Therefore,
There is a problem that color display is more difficult.

The present invention has been made in view of such a situation, and an object of the present invention is to provide an (electrophoretic) display device capable of reducing display unevenness and reducing manufacturing costs. Is what you do.

[0012]

The present invention comprises colored charged particles dispersed in an insulating liquid, and a first electrode and a second electrode for applying a voltage to the colored charged particles. A display device which performs display by moving the colored charged particles in the direction of the first electrode or the second electrode by a voltage applied to an electrode and a second electrode, wherein the insulating liquid and the colored charged particles transmit light. While filling the tubes with the properties,
It is characterized by being disposed in close contact between a first substrate on which the first electrode is formed and a light-transmissive second substrate on which the light-transmissive second electrode is formed.

[0013] The present invention also relates to the present invention, wherein the colored charged particles are charged into the first electrode and the second electrode by a voltage applied to the first and second electrodes.
And moving vertically to the second substrate.

Further, the present invention is characterized in that the insulating liquid and the colored charged particles in the tube are simultaneously filled in the tube.

Further, the present invention is characterized in that the insulating liquid and the colored charged particles in the tube are separately filled in the tube.

Further, the present invention is characterized in that the tube is formed of a polymer.

Further, the present invention is characterized in that the insulating liquid filled in the tube is colored differently from the colored charged particles.

Further, the present invention is characterized in that the insulating liquid is colored in any of yellow, magenta and cyan.

Further, the present invention is characterized in that the tubes filled with the insulating liquids of different colors are regularly arranged between the first substrate and the second substrate.

Further, the present invention is characterized in that the colored charged particles filled in the tube are colored in any of yellow, magenta and cyan.

Further, the present invention is characterized in that tubes filled with the charged particles of different colors are regularly arranged between the first substrate and the second substrate.

Further, the present invention is characterized in that the first substrate and the second substrate are polymer films.

Also, as in the present invention, the insulating liquid and the first
A tube having optical transparency is filled with colored charged particles that move in the direction of the first electrode or the second electrode by a voltage applied to the electrode and the second electrode, and the insulating liquid and the colored charged particles are filled. The colored tubes are disposed between the first substrate on which the first electrode is formed and the light-transmissive second substrate on which the light-transmissive second electrode is formed. Make sure it is evenly dispersed.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of an electrophoretic display device as a display device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a part of a cross section thereof.

1 and 2, reference numeral 1 denotes an insulating liquid;
2 is a colored charged particle, 3 is a light-transmitting tube enclosing the insulating liquid 1 and the colored charged particle 2, 4 is a first substrate,
Reference numeral 6 denotes a light-transmitting second substrate, and the tube 3 is held between the first substrate 4 and the second substrate 6. In addition, a first electrode 8 is formed on the first substrate 4, and a light-transmissive second electrode 7 is formed on the second substrate 6.

Here, this electrophoretic display device (hereinafter, referred to as a display device) applies colored charged particles 2, which are electrophoretic particles charged in an insulating liquid, perpendicularly to the substrate surface and on the first electrode surface.
Alternatively, the display is performed by moving the colored charged particles 2 in the insulating liquid as shown in FIG. 2A by applying a voltage to the first electrode 8. When collected on the first electrode, the observer (the second substrate side) observes (displays) the color of the insulating liquid 1. On the other hand, as shown in FIG.
Is collected on the second electrode, the color of the colored charged particles 2 is observed.

Then, with this configuration,
For example, if the colored charged particles 2 are black and the insulating liquid 1 is white, black and white display is possible.

By the way, in such a display device,
Color display can be performed by using the insulating liquids 1 of a plurality of colors and by using the colored charged particles 2 of a plurality of colors.

Next, a display device capable of performing such a color display will be described.

FIG. 3 is a cross-sectional view of a display device for performing color display using insulating liquids of a plurality of colors. In this display device, as shown in FIG. , Magenta (M), and cyan (C) insulating liquids 10, 11, and 12 are regularly arranged. Further, the colored charged particles 2 are made white and the second substrate 6 and the second electrode 7 are formed of a translucent material, while the display is observed from the second substrate side.

Here, for example, the display of yellow (Y) is as follows.
The colored charged particles 2 in the tube in which the yellow (Y) insulating liquid 10 is sealed are collected on the first electrode, and the other magenta (M) and cyan (C) insulating liquids 11 and 12 in the tube are sealed. It becomes possible by collecting the colored charged particles 2 on the second electrode. Further, as shown in FIG. 1, the insulating liquid 1 of yellow (Y), magenta (M), and cyan (C) is used.
If all the colored charged particles 2 in each tube in which 0, 11, and 12 are sealed are collected on the first electrode, black can be displayed. Conversely, all the colored charged particles 2 can be collected on the second electrode. White can be displayed.

FIG. 4 is a cross-sectional view of a display device for performing color display using colored charged particles of a plurality of colors. In this display device, as shown in FIG. (Y), magenta (M), cyan (C)
Tube 3 enclosing colored charged particles 13, 14, 15 of each color
Are arranged regularly. The display is observed from the second substrate side.

Here, for example, the display of yellow (Y) is as follows.
The yellow (Y) colored charged particles 13 are collected on the second electrode, and the magenta (M) and cyan (C) colored charged particles 1 are collected.
This is made possible by collecting 4,15 on the first electrode.
Further, as shown in FIG.
Is collected on the first electrode, white can be displayed.
Conversely, if all the colored charged particles 13, 14, 15 are collected on the second electrode, black can be displayed.

In the above-described color display, the colors of the colored charged particles 2, 13, 14, and 15 may be the colors of the materials themselves, or may be those obtained by laminating and mixing other materials on the surfaces of those materials. Further, the colored particles 2, 13, 14, 15 may be made of one or more materials.

Next, a manufacturing process of such a display device will be described.

First, the charged particles 2 and the insulating liquid 1 are filled in the light transmitting tube 3. In the present embodiment, the tube 3 has a circular or elliptical cross section, and the tube 3 is made of acrylic resin, polystyrene, polyethylene terephthalate (PET), or the like having a high visible light transmittance. Polyether sulfone (PE
Although a polymer such as S) or an inorganic material such as glass or quartz can be used, a polymer having high flexibility is particularly preferably used. The diameter of the tube 3 is appropriately determined according to the size of the display pixel.

On the other hand, as the insulating liquid 1, a liquid such as silicone oil, toluene, xylene, or high-purity petroleum is used. When the insulating liquid 1 is colored to perform color display, a dye or the like is used as a coloring material. Is used by dissolving or dispersing it in the insulating liquid.

As the colored charged particles 2, a material which can be charged in an insulating liquid is used. For example, a mixture of a resin such as titanium oxide (white), aluminum oxide (white), polyethylene, or polystyrene and a coloring agent is used.
Here, as the coloring agent, carbon (black) and other known dyes and pigments such as phthalocyanine blue, induslen blue, peacock blue, permanent red, lake red, rhodamine lake, Hansa yellow, permanent yellow, and benzine yellow are widely used. be able to. Incidentally, the size of the particles is usually 0.1 μm
位 50 μm is used.

As a method for filling the charged particles 2 and the insulating liquid 1 into the tube 3, for example, as shown in FIG. One end of the tube 3 is put into the liquid while mixing well, and simultaneously filled while sucking from the other end. Alternatively, as shown in FIG. After uniformly adhering, the charged liquid particles 2 and the insulating liquid 1 are separately filled into the tube 3 by putting the insulating liquid 1 into the tube 3.

After the charged colored particles 2 and the insulating liquid 1 are filled by these methods, both ends of the tube 3 are closed and sealed by heating or the like.

Next, the tube 3 is arranged between the substrates according to the process shown in FIG. That is, first, the first electrode 8 is patterned on the first substrate 4 as shown in FIG. As a material of the first substrate 4, a material having high heat resistance, for example, a polymer film such as polyethylene terephthalate (PET) or polyether sulfone (PES), or an inorganic material such as glass or quartz can be used.

The first electrode 8 may be made of any conductive material that can be patterned. If the first electrode 8 is a transparent electrode, indium tin oxide (I
TO) or the like. Note that an insulating layer (not shown) may be formed on the first electrode as needed to make the entire surface smooth.

Next, a second electrode 7 is formed on the second electrode 6 by patterning as shown in FIG. The material for forming the second electrode 7 is a material having high visible light transmittance and high heat resistance. Also, a material having a high visible light transmittance is used as a material for forming the second electrode 7. Furthermore, after the formation of the second electrode, an insulating layer (not shown) may be formed on the second electrode 6 so as to smooth the entire surface.

Next, a tube 3 filled with the colored charged particles 2 and the insulating liquid 1 is arranged on the first substrate 4 as shown in FIG. In the case of a color display, the colored charged particles 2 of different colors or the tube 3 in which the insulating liquid 1 is sealed are arranged as appropriate, for example, in the order of yellow (Y), magenta (M), and cyan (C). I do.

Next, as shown in (d), the second substrate 6 is
After the first and second electrodes 7 and 8 are arranged above the tube 3 in a direction orthogonal to each other, the first and second electrodes 7 and 8 are aligned with the first substrate 4, and thereafter, heat is applied to the outer peripheral portion via an outer frame (not shown). In addition, the first substrate 4 and the second substrate 6 are bonded. At this time, both substrates 4, 6
The pipes 3 are deformed in accordance with the distance between the pipes, whereby the pipes can be arranged in close contact with each other without any gap as shown in FIG. Finally, a display device is manufactured by providing a voltage applying means (not shown).

As described above, the insulating liquid 1 and the colored charged particles 2 are filled in the light-transmissive tube 3 and a plurality of the tubes 3 are arranged side by side, so that the colored charged particles 2 can be uniformly dispersed during manufacturing. Can be easily performed. Also,
Since the time and labor-consuming steps such as the formation of the partition walls on the substrate and the uniform dispersion of the colored charged particles 2 and the insulating liquid 1 in the minute regions are not required, the cost can be reduced. In addition, the yield can be improved.

Further, since the colored charged particles 2 only move in the tube, even when the display device is used for a long time, the bias of the colored charged particles 2 can be reduced, and display unevenness can be prevented. Further, the display device manufactured by the above method can perform two-color display and color display, and can realize a high viewing angle and a high contrast.

Next, an example of this embodiment will be described.

Example 1 In Example 1, a display device was manufactured as follows.

First, polyethylene terephthalate (PE)
The charged tube and the insulating liquid were filled in a light-transmitting tube made of T). Here, a tube having a circular cross section and an inner diameter of 200 μm was used as the light transmitting tube. As the insulating liquid, a silicone oil in which a lipophilic white dye was dissolved was used. As the colored charged particles, a mixture of polystyrene and carbon having a particle size of about 1 μm to 2 μm was used.

Further, as a method for filling the tube with the charged particles and the insulating liquid, as shown in FIG. 5A, the insulating liquid 1 and the charged particles 2 are placed in an appropriate container 9. In this method, one end of the tube 3 was put into the liquid while stirring well, and then filled while sucking from the other end.
Then, after the filling was completed, both ends of the tube 3 were closed and sealed by heating.

Next, ITO was formed as a first electrode 8 on a first substrate 4 made of a PET film having a thickness of 200 μm,
Line patterning was performed by photolithography and dry etching (see FIG. 6A). Next, a light-transmitting second film made of a PET film having a thickness of 200 μm.
An ITO film was formed on the substrate 6 as the second electrode 7, and was patterned into a line by photolithography and dry etching (see FIG. 6B).

Next, the tubes 3 filled with the colored charged particles 2 and the insulating liquid 1 were arranged on the first substrate 4 thus configured (see FIG. 6C). After that, the second substrate 6 is arranged above the tube 3 so that the first and second electrodes 7 and 8 are orthogonal to each other (see FIG. 6D).
After the positioning of the substrate 4 and the second substrate 6, the first and second substrates 4 and 6 were bonded by applying heat to the outer peripheral portion via an outer frame.

Thus, the upper and lower portions of the tube 3 are
, And the pipes were arranged in close contact with no gap (see (e) of FIG. 6). Finally, a voltage applying means was provided to obtain a display device.

Next, a display was performed using the display device thus manufactured. Note that the applied voltage was ± 50 V. Here, since the colored charged particles 2 used in Example 1 were positively charged in the silicone oil, they moved onto the electrode to which a negative voltage was applied. Accordingly, when the electrode to which the negative voltage is applied is the first electrode 8, the black colored charged particles 2 move on the first electrode (see FIG. 2A).
The display surface became white display.

On the other hand, when the electrode to which a negative voltage is applied is the second electrode 7, the black colored charged particles 2 move on the second electrode (see FIG. 2B). Black color was observed. The response speed at this time is 30 msec.
It was below. Further, no display unevenness due to uneven distribution of the colored charged particles 2 was observed.

Example 2 In Example 2, a display device was manufactured as follows.

First, polyethylene terephthalate (PE)
The charged tube and the insulating liquid were filled in a light-transmitting tube made of T). Here, a tube having a circular cross section and an inner diameter of 200 μm was used as the light transmitting tube. Silicone oil in which a lipophilic blue dye was dissolved was used as the insulating liquid, and white TiO ₂ particles having a size of about 1 μm to ₂ μm were used as the colored charged particles.

Further, as a method for filling the tube with the colored charged particles and the insulating liquid, the same method as in Example 1 was used. Then, after the filling was completed, both ends of the tube were closed and sealed by heating. Hereinafter, a display device was manufactured in the same manner as in Example 1.

Next, display was performed using the display device thus manufactured. Note that the applied voltage was ± 50 V. Here, since the colored charged particles used in Example 2 were negatively charged in the silicone oil, they moved onto the electrode to which a positive voltage was applied. Thus, when the electrode to which the positive voltage is applied is the first electrode 8, the white colored charged particles 2 move on the first electrode (see (a) of FIG. 2), and the display surface is displayed in blue. Was.

On the other hand, when the electrode to which the positive voltage is applied is the second electrode 7, the white colored charged particles 2 move on the second electrode (see FIG. 2B). White color was observed. The response speed at this time is 30 msec.
It was below. Further, no display unevenness due to uneven distribution of the colored charged particles 2 was observed.

Example 3 In Example 3, a display device was manufactured as follows.

First, polyethylene terephthalate (PE)
The charged tube and the insulating liquid were filled in a light-transmitting tube made of T). Here, as the light-transmitting tube, a tube having a cross section of 200 μm on a side and a rounded corner was used. The insulating liquid is silicone oil in which a lipophilic white dye is dissolved, and the colored charged particles are a mixture of polystyrene and carbon.
A black material of about m to 2 μm was used.

Further, as a method for filling the tube 3 with the colored charged particles and the insulating liquid, the same method as in Example 1 was used. Then, after the filling was completed, both ends of the tube 3 were closed and sealed by heating.

Next, as shown in FIG.
An ITO film was formed as a first electrode 8 on a first substrate 4 made of a PET film having a thickness of 0 μm, and patterned into a line by photolithography and dry etching. After that, as shown in FIG.
An ITO film was formed as a second electrode 7 on a light-transmissive second substrate 6 made of an ET film, and was patterned into a line by photolithography and dry etching. The line width of the first and second electrodes 7 and 8 was set to 150 μm.

Next, as shown in (c), the tube 3 in which the colored charged particles 2 and the insulating liquid 1 are filled on the second substrate 6 is placed such that the center of the tube 3 coincides with the center of the second electrode 7. And aligned without gaps. Then, as shown in (d), the first substrate 4 is disposed above the tube 3 so that the first and second electrodes 7 and 8 are orthogonal to each other. After the alignment of the two substrates 6, the first and second substrates 4 and 6 were bonded by applying heat to the outer peripheral portion via an outer frame. Thereby, as shown in (e), the pipes were arranged in close contact with no gap. Finally, a voltage applying means was provided to obtain a display device.

Next, display was performed using the display device thus manufactured. The response speed at this time is 30 ms.
ee or less, and no display unevenness due to uneven distribution of the colored charged particles was observed.

Example 4 In Example 4, a display device was manufactured as follows.

First, polyether sulfone (PES)
Was filled with colored charged particles and an insulating liquid. Here, a tube having a circular cross section and an inner diameter of 200 μm was used as the light transmitting tube. Further, as the insulating liquid, three kinds of liquids in which a lipophilic dye is dissolved in silicone oil and colored in yellow (Y), magenta (M), and cyan (C) are used. Titanium white fine particles with a particle size of 1 μm to 2 μm
The one of the rank was used.

Further, as a method for filling the charged particles and the insulating liquid into the tube, as shown in FIG. 5B, the colored charged particles 2 are uniformly attached to the inner wall of the tube 3 in advance. After that, a method was used in which one end of the tube 3 was placed in an insulating liquid and filled while sucking from the other end. Then, after the filling is completed, both ends of the tube 3 are closed and sealed by heating, and 3
Each colored tube 3 was produced.

Next, the first electrode 8 is formed on the first substrate by the same method as in the first embodiment (see FIG. 6A), and thereafter, the second electrode 7 is formed on the second substrate 6. ((B) of FIG. 6)
reference).

Next, the three colored tubes 3 were sequentially arranged on the first substrate 4 configured as described above (see FIG. 6C). Then, after this, the second substrate 6
Is disposed above the tube 3 so that the first and second electrodes 7 and 8 are orthogonal to each other (see FIG. 6D). Thereafter, the first and second substrates 4 and 6 are aligned. After that, the first and second substrates 4 and 6 were bonded by applying heat to the outer peripheral portion via an outer frame.

As a result, the upper and lower portions of the tube 3 are
, And the pipes were arranged in close contact with no gap (see (e) of FIG. 6). Finally, a voltage applying means was provided to obtain a display device.

Next, display was performed using the display device thus manufactured. Note that the applied voltage was ± 50 V. Here, since the colored charged particles 2 used in Example 4 were negatively charged in the silicone oil, they moved onto the electrode to which a positive voltage was applied. Thus, when the electrode to which a positive voltage is applied is the first electrode 8, the white colored charged particles 2 move on the first electrode (see FIG. 3), and thus each of the insulating liquids 10, 11, and 12 is moved. Color could be observed.

On the other hand, when the electrode to which the positive voltage was applied was the second electrode 7, the white colored display particles were displayed on the display surface because the white colored charged particles 2 moved on the second electrode. At this time, the response speed was 30 msec or less, and no display unevenness due to uneven distribution of the colored charged particles was observed. In addition, when the elements forming the respective colors of yellow (Y), cyan (C), and magenta (M) were combined and formed, color display could be performed.

Example 5 In Example 5, a display device was manufactured as follows.

First, polyethylene terephthalate (PE)
The charged tube and the insulating liquid were filled in a light-transmitting tube made of T). Here, a tube having a circular cross section and an inner diameter of 200 μm was used as the light transmitting tube. As the insulating liquid, a silicone oil in which a lipophilic white dye is dissolved is used, and as the colored charged particles, polysterene is mixed with yellow (Y), magenta (M), and cyan (C) colorants. Colored particles having a particle size of about 1 μm to 2 μm were used.

Further, as a method of filling the charged particles and the insulating liquid into the tube, as shown in FIG. 5B, the colored charged particles 2 of one color on the inner wall of the tube 3 are uniformly attached in advance. After that, a method was used in which one end of the tube 3 was placed in an insulating liquid and filled while sucking from the other end. Then, after the filling was completed, both ends of the tube 3 were closed and sealed by heating. The same operation was performed for the other two-color particles. Then, a tube 3 in which particles of three colors were separately sealed was produced in this manner.

Next, the first electrode 8 is formed on the first substrate by the same method as in the first embodiment (see FIG. 6A), and thereafter, the second electrode 7 is formed on the second substrate 6. ((B) of FIG. 6)
reference).

Next, the colored tubes 3 of three colors were sequentially arranged on the first substrate 4 thus configured (see FIG. 6C). Then, after this, the second substrate 6
Is disposed above the tube 3 so that the first and second electrodes 7 and 8 are orthogonal to each other (see FIG. 6D). Thereafter, the first and second substrates 4 and 6 are aligned. After that, the first and second substrates 4 and 6 were bonded by applying heat to the outer peripheral portion via an outer frame.

Thus, the upper and lower portions of the tube 3 are
, And the pipes were arranged in close contact with no gap (see (e) of FIG. 6). Finally, a voltage applying means was provided to obtain a display device.

Next, display was performed using the display device thus manufactured. Note that the applied voltage was ± 50 V. Here, the colored charged particles 13, 14, 1 used in Example 4 were used.
Since No. 5 was positively charged in the silicone oil, it moved onto the electrode to which a negative voltage was applied. As a result, when the electrode to which the negative voltage is applied is the first electrode 8, the colored charged particles 13, 14, and 15 have moved on the first electrode (see FIG. 4). , 1
4,15 colors could be observed.

On the other hand, when the electrode to which the negative voltage is applied is the second electrode 7, the colored charged particles 13, 14,
15 moved, the white color of the insulating liquid 1 could be observed from the display surface. The response speed at this time is 30 msec.
e or less, and no display unevenness due to uneven distribution of the colored charged particles was observed. Also, yellow (Y), cyan (C),
When the elements that formed each color of magenta (M) were combined and formed, color display could be performed.

[Embodiment 6] In this embodiment 6, the pipe 3
Is used, the distance between the substrates is reduced to 25 μm, and the colored charged particles 2 are further reduced to 0.5 μm.
A display device was manufactured in the same process as in Example 1 using a device having a size of about 1 μm to 1 μm.

Then, display was performed in the same manner as in Example 1 using the display device thus manufactured. In addition,
The applied voltage was ± 50V. Here, in Example 6, since the distance between the substrates was shortened to shorten the migration distance,
The response speed became 5 msec or less, and high-speed response became possible. Further, no display unevenness due to uneven distribution of the colored charged particles 2 was observed.

[0087]

As described above, according to the present invention, an insulating liquid and colored charged particles are filled in a light-transmitting tube, and the tubes filled with the insulating liquid and the colored charged particles are filled with each other. Is disposed between the first substrate on which the first electrode is formed and the light-transmissive second substrate on which the light-transmissive second electrode is formed, so that the colored charged particles can be evenly distributed. It is possible to disperse, and thereby display unevenness can be reduced. Further, since time-consuming and troublesome steps such as formation of partition walls on a substrate and uniform dispersion of colored charged particles and insulating liquid in minute regions are not required, manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electrophoretic display device which is a display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a part of a cross section of the electrophoretic display device.

FIG. 3 is a cross-sectional view of the electrophoretic display device that performs color display using insulating liquids of a plurality of colors.

FIG. 4 is a cross-sectional view of the electrophoretic display device that performs color display using colored charged particles of a plurality of colors.

FIG. 5 is a view showing a method of filling the above tube with an insulating liquid and colored charged particles.

FIG. 6 is a diagram showing a method of manufacturing the electrophoretic display device.

FIG. 7 is a diagram showing a method for manufacturing the electrophoretic display device according to Example 3 of the above embodiment.

FIG. 8 illustrates a configuration of a conventional electrophoretic display device.

[Explanation of symbols]

 Reference Signs List 1,10,11,12 Insulating liquid 2,13,14,15 Colored charged particles 3 Tube 4 First substrate 6 Second substrate 7 Second electrode 8 First electrode 31 Electrophoretic particles 32 Insulating liquid 33 Electrode 34 Electrode

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Ikeda 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 5C094 AA03 AA08 AA43 AA44 AA55 BA12 BA76 CA19 CA24 DA12 EA04 EA05 EB02 ED11 ED15 FA01 FA02 FB01 FB02 FB03 FB04 FB15 GA10

Claims (11)

[Claims] 1. Colored charged particles dispersed in an insulating liquid, and a first electrode and a second electrode for applying a voltage to the colored charged particles, wherein the first and second electrodes are applied to the first and second electrodes. A display device that performs display by moving the colored charged particles in the direction of the first electrode or the second electrode by applying a voltage, wherein the insulating liquid and the colored charged particles are filled in a light-transmissive tube. Wherein the tubes are closely arranged between the first substrate on which the first electrode is formed and the light-transmissive second substrate on which the light-transmissive second electrode is formed. Display device. 2. The display according to claim 1, wherein the colored charged particles are moved vertically with respect to the first and second substrates by a voltage applied to the first electrode and the second electrode. apparatus. 3. The display device according to claim 1, wherein the insulating liquid and the colored charged particles in the tube are simultaneously filled in the tube. 4. The display device according to claim 1, wherein the insulating liquid and the colored charged particles in the tube are separately filled in the tube. 5. The display device according to claim 1, wherein the tube is formed of a polymer. 6. The insulating liquid filled in the tube,
The display device according to claim 1, wherein the display device is colored in a different color from the colored charged particles. 7. The method according to claim 7, wherein the insulating liquid is yellow, magenta,
The display device according to claim 6, wherein the display device is colored in any of cyan. 8. The method according to claim 1, wherein the tubes filled with the insulating liquids of different colors are regularly arranged between the first substrate and the second substrate. The display device according to claim 1. 9. The display device according to claim 1, wherein the colored charged particles filled in the tube are colored yellow, magenta, or cyan. 10. The display device according to claim 1, wherein tubes filled with the charged particles of different colors are regularly arranged between the first substrate and the second substrate. 11. The display device according to claim 1, wherein the first substrate and the second substrate are polymer films.