JP2002251143A - Picture display medium and picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture display medium and a picture display device, capable of minimizing disorder of a picture due to physical disturbances such as a strong impact and vibration, and also reducing influences by electrical disturbances such as static electricity and ultraviolet rays, and chemical disturbances. SOLUTION: This device is composed of a picture display part 10 in which a picture display member 18a supported by shock absorbing members 16 is housed in a transparent casing 14, and a voltage control part 12 for applying voltage to the picture display part 10 according to picture information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly to an image display medium and an image display device that can be repeatedly rewritten by applying a voltage.

[0002]

2. Description of the Related Art Conventionally, a TwistBall Disp.
For example, a lay (two-color coated particle rotating display medium), an electrophoretic display medium, a magnetophoretic display medium, a thermal rewritable display medium, and a liquid crystal having memory properties have been proposed.

[0003] Among these repeatedly rewritable display media, a thermal rewritable display medium and a liquid crystal having a memory property are characterized by being excellent in an image memory property.

[0004] A display medium utilizing electrophoresis and magnetophoresis disperses colored particles movable by an electric field or a magnetic field in a white liquid, and forms an image with the color of the colored particles and the color of the white liquid. It is. For example, the image portion displays the color of the colored particles by attaching the colored particles to the display surface,
In the non-image portion, the colored particles are removed from the display surface, and white is displayed by the white liquid. In a display medium using electrophoresis and magnetophoresis, since the movement of the colored particles does not occur without the action of an electric field or a magnetic field, the display medium has a display memory property.

[0005] Also, Twisting Ball Dis
In the play, the spherical particles having the half surface painted white and the other surface painted black are reversely driven by the action of an electric field. For example, in the image portion, the black surface is on the display surface side, and in the non-image portion, the white surface is on the display surface side. The display is performed by applying an electric field such that

According to this method, the particles do not undergo inversion driving unless there is an action of an electric field, so that the particles have a display memory property. Also, inside the display medium, oil exists only in the cavities around the particles, but since it is almost in a solid state,
It is relatively easy to make the display medium into a sheet.

However, a thermal rewritable display medium, a liquid crystal having a memory function, etc. cannot display a display surface of sufficient white like paper, and when an image is displayed, an image portion and a non-image portion are not displayed. Because the contrast is small,
It is difficult to provide a clear display.

Further, in a display medium utilizing electrophoresis and magnetophoresis, although white display properties using a white liquid are excellent, when displaying the color of colored particles, the white liquid enters gaps between the colored particles. The concentration will drop. Therefore, the contrast between the image part and the non-image part becomes small, and it is difficult to visually confirm the distinction between the part where the image is displayed and the part where the image is not displayed, and it is difficult to obtain a clear display.

Further, since a white liquid is sealed in these display media, when the display medium is detached from the image display device and handled roughly like paper, the white liquid may leak from the display medium. There is.

[0010] Twist Ball Displa
In the case of y, even if the hemispherical surface painted white is completely aligned with the display side, light rays that have entered the gap between the spheres are not reflected and are lost inside.
0% white display is not possible. Further, the white display becomes grayish due to the influence of light absorption and light scattering in the cavity portion. Further, it is difficult to completely invert the particles, which also causes a decrease in contrast, and as a result, it is difficult to obtain a clear display. Further, since the particle size is required to be smaller than the pixel size, fine particles having different colors must be manufactured for high-resolution display, which requires advanced manufacturing technology. There is also a problem.

For this reason, several display media using toner (particles) have been proposed as new display media for solving the above problems (Japan Har).
dccopy, '99 Transactions, p249-p252, Ja
Pan Hardcopy, '99 fall Preprints,
p10-p13).

These display media include a transparent display substrate,
A conductive colored particle group (colored toner) and a white particle group (white powder) are encapsulated between this and a rear substrate opposed with a small gap therebetween. It moves to the display substrate side by an electric field formed between the substrates according to image data, and performs image display by contrast with white powder.

According to the particle display medium using the particle group, the particle group does not move unless an electric field acts, so that the image display medium has a memory property. No liquid leakage problem. Since the display between white and black can be switched by 100% in principle, it is possible to display a clear image with high contrast. Further, a two-color image (for example, a black-and-white image) having a high display contrast can be displayed by using particles having a high concealing property. In the following, a display medium using a particle group is simply referred to as an image display medium.

[0014]

The image display medium is used on a daily or extraordinary basis, as apparent from the purpose of its use, for example, when applied to a signboard advertisement or electronic paper. Stimuli due to disturbances such as shocks and vibrations are likely to be given.

The image display medium is configured to maintain the display state of the image by attaching the colored particles to one of the substrates with a mirror image force, an intermolecular force, a Van der Waals force, or the like. There is a problem in that the position of the particle is moved by the stimulus caused by the image and the displayed image is disturbed.

Further, the surface may be rubbed for some reason, and an electric field may be generated between the substrates by the electrostatic force generated by the friction. In this case, the particles sealed between the substrates may move due to the electric field generated by the electrostatic force. However, there is a problem that the image is disturbed.

The present invention has been made to solve the above problems, and minimizes image disturbance due to physical disturbances such as strong shocks and vibrations, as well as electrical disturbances such as static electricity and ultraviolet rays. In addition, the present invention provides an image display medium and an image display device that can reduce the influence on chemical disturbance.

[0018]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: a pair of substrates, at least one of which is light-transmissive and which is disposed to face each other; And at least one type of colored particles sealed between the substrates, and an image display medium for displaying an image by the color of the colored particles arranged on one substrate side of the pair of substrates, A disturbance protection member is provided on at least a part of the outer surface of the image display medium.

In an image display medium for displaying an image by the color of the colored particles arranged on one substrate side of a pair of substrates, the colored particles are formed on one side by a mirror image force, an intermolecular force, a Van der Waals force, or the like. In order to maintain a display state of an image by attaching to a substrate, it is necessary to minimize the force applied to particles due to disturbance.

Therefore, according to the first aspect of the present invention, a mechanical stimulus from the outside working on a daily or extraordinary basis,
Provide a disturbance protection member to protect against electrical stimulus, optical stimulus, chemical stimulus, magnetic stimulus, thermal stimulus, etc. around a part of the display medium or around the display medium. I have.
This makes it possible to use the device with high reliability under various external environments.

As such a disturbance protection member, an impact absorbing material, a cushioning material, an antistatic agent, an ultraviolet absorbing material, a magnetic shield and the like can be applied, but preferably, as described in the second aspect of the present invention, A shock absorbing material that covers at least a part of the periphery of the image display medium, or a case that holds the image display medium via the shock absorbing material can be provided. With this configuration,
Since physical disturbances such as strong shocks and vibrations are absorbed by the shock absorbing material, it is possible to suppress physical disturbances acting on the image display medium, thereby suppressing image disturbance due to physical disturbances. Is possible.

The shock absorbing material may cover a part of the image display medium, but preferably covers the entire image display medium. By forming the shock absorbing material so as to cover the entire image display medium, it is possible to obtain shock resistance and vibration resistance while minimizing an increase in the thickness of the image display medium. Note that, in this case, it is preferable that the disturbance protection member be formed of a transparent member from the viewpoint of good image display. Also, by making the disturbance protection member transparent,
Depending on the situation in which the image display medium is used, the display surface may be single-sided or the display surface may be double-sided. The disturbance protection member is configured to cover the display surface by making the disturbance protection member transparent. In this case, a favorable display state can be ensured without the disturbance protection member interfering with the display.

When the disturbance protection member is a housing for holding the image display medium via a shock absorbing material, for example, various kinds of disturbance protection members such as gas, liquid and gel are used. The space between the housings may be filled with a disturbance protection member. With such a configuration, the housing protects the periphery of the image display medium, and the shock absorber absorbs a strong shock or vibration momentarily applied from the outside. It is possible to more effectively prevent a strong shock or vibration from being applied.

The disturbance protection member may be an antistatic film covering at least a part of the periphery of the image display medium. By providing the antistatic film, it is possible to appropriately prevent the static charges on the surface of the image display medium from leaking and to prevent accumulation of the static charges.

For example, a voltage is applied from the outside to a medium in which two kinds of particles holding electric charges of opposite polarities are sealed between substrates made of an insulating film, and the desired particles are moved to move the contrast. In the case where the image display medium does not have the electrode group on the substrate, as in the case of obtaining the above, it is effective to provide a thin insulating film on the substrate in order to increase the electric field strength acting on the particle group. However, when a thin insulating film is provided on a substrate, the substrate is easily affected by static electricity from the outside, and the static electricity accumulates to generate an electric field, and the electric field causes particles to move, thereby impairing a display state of an image. There is a disadvantage.

For this reason, by constituting at least a part of the periphery of the image display medium with the antistatic film, it is possible to prevent accumulation of static electricity. Therefore, it is possible to prevent the particles from moving due to the electric field generated by the accumulated static electricity and causing image display failure.

As another example of the image display medium having no electrode group on the substrate of the image display medium, two kinds of particle groups holding oppositely-polarized charges between substrates made of a charge transporting film are described. Image display media. In this image display medium, by applying a voltage from the outside, a charge is injected into the particles through the charge transporting film to charge the particles, and a desired group of particles is moved by an electric field generated according to image information. In this way, an image is displayed.

In the case of this image display medium, charges are transported by a voltage equal to or higher than a certain value, while weak charges generated on the substrate surface as disturbance are not transported or accumulated.
By providing a semiconductive film that disappears in the vicinity of the surface as an antistatic film on at least a part of the periphery of the image display medium, it is effective against electrostatic disturbance.

In the case of a structure in which the electrode group is provided on the substrate of the image display medium, the electrode group functions as a shield and the thickness of the dielectric constituting a part of the substrate is large, so that the influence of static electricity from the outside is increased. Is relatively small, but by providing an antistatic film on at least a part of the periphery of the image display medium, it is effective in preventing disturbance of the particles held on the substrate.

It should be noted that either one of the shock absorbing material and the antistatic film may be provided as the disturbance protection member, or both the shock absorbing material and the antistatic film may be provided.

[0031] The invention described in claim 5 is the same as that in claim 1.
5. The image display medium according to claim 1, wherein the disturbance protection member is configured to be detachable from the image display medium. 6.

According to the fifth aspect of the present invention, since the disturbance protection member is configured to be detachable from the image display medium, the disturbance protection member can be removed at the time of forming an image on the image display medium. The image display medium can be set to the optimum state at the time of image formation and at the time of image formation, respectively. Therefore, good image formation and image display can be realized. In particular,
When displaying an image, the image display medium is stored in a holder or a housing, and when displaying an image on the image display medium or rewriting an image to be displayed, only the image display medium can be taken out of the holder or the housing. In particular, this configuration is effective when the disturbance protection member hinders the image formation.

[0033] The invention described in claim 6 is the same as the claim 1.
The image display medium according to any one of claims 1 to 5, further comprising a pair of electrodes for generating an electric field in a space formed between the pair of substrates, wherein the pair of electrodes are provided in the image display medium. It is characterized by being enclosed in.

In the image display medium according to the present invention, at least one of the substrates is light-transmissive, and is enclosed between the pair of substrates disposed so as to face each other. At least one kind of colored particle group, and a pair of electrodes that generate an electric field in a space formed between the pair of substrates, and are arranged on one of the pair of substrates by the electric field. An image display medium for displaying an image in accordance with the color of the colored particle group, wherein the pair of electrodes is sealed in the image display medium.

According to the present invention, since the pair of electrodes are sealed in the image display medium, the electrodes provided on the substrate may come into contact with the electrodes of another display medium, or the display may not be performed. Contact with a human body such as a hand or a substance other than a medium can be avoided.

Thus, the particles are held on the substrate, and the image is stably held for a long time. It is effective to form a concave structure so that the electrode of the connecting portion is not directly exposed to the outside. By making the electrodes hidden in the concave portions of the image display medium, it is possible to prevent a hand or an object from directly contacting the electrodes.

An image display device according to the invention described in claim 8 is:
The image display medium according to any one of claims 1 to 7, further comprising display control means for generating an electric field between the pair of substrates according to image information.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of an embodiment to which an image display device of the present invention is applied will be described in detail with reference to the drawings.

(First Embodiment) As shown in FIG. 1, an image display device according to a first embodiment
0, a voltage control unit 12. Image display unit 1
Reference numeral 0 denotes a configuration in which the image display member 18a supported by the shock absorbing member 16 is stored in the casing 14.
The image display member 18a has a display-side electrode 22, a spacer 26, and a surface protection layer 28 having a transparent surface protection layer 24 formed between a transparent display substrate 20 and a rear substrate 23 forming an image display surface. This is a configuration in which the formed back-side electrodes 25 are sequentially formed. The display-side electrode 22 has a voltage controller 1
2 is connected, and the back electrode 25 is grounded. Also,
The image display section 10 corresponds to the image display medium of the present invention, and the voltage control section 12 corresponds to the display control means of the present invention.

In the first embodiment, as the display substrate 20 and the back substrate 23, for example, vertical × horizontal × thickness = 50
705mm × 50mm × 1.1mm with transparent ITO
9 glass substrates are applied. On the surface of the display substrate 20, a display-side electrode 22 made of ITO is formed. The voltage controller 12 is connected to the display-side electrode 22. The surface of the display-side electrode 22 is coated with a 5 μm-thick polycarbonate resin (PC-Z) as a surface protection layer 24. The back substrate 23 also has a back electrode 25 and a surface protection layer 28 formed of ITO.

The spacer 26 is, for example, 40 mm × 40
The silicon rubber sheet having a size of 0.3 mm × 0.3 mm is formed in a lattice shape formed by cutting out a central portion of, for example, a 15 mm × 15 mm square. In the space cut out into a square, colored particles (black particles) 40 and white particles 42
Is enclosed.

The black particles 40 are obtained by mixing a silica fine powder treated with an aminosilane coupling agent with a weight ratio of 100 to 0.1.
These are black spherical particles of carbon-containing polymethyl methacrylate having an average particle diameter of 20 μm, which were stirred and mixed at a ratio of 2. The white particles 42 are white spherical particles of titanium oxide-containing polymethyl methacrylate having an average particle size of 20 μm obtained by stirring and mixing fine powder of titania treated with an alkylsilane-based coupling agent at a weight ratio of 100: 0.1. In the first embodiment, about 15 mg of mixed particles obtained by mixing the above-described black particles 40 and white particles 42 at a weight ratio of 1: 2 is enclosed. In the present embodiment, the white particles 42 are negatively charged, and the black particles 40 are positively charged.

In the present embodiment, the image display member 1
8a is stored together with the shock absorbing member 16 in a transparent plastic casing 14. Shock absorbing member 1
Reference numeral 6 denotes αGEL (trade name; manufactured by Geltech Co., Ltd.), which is a kind of gel-like substance mainly composed of silicone. This αGEL has a width x length x thickness of about 10mm x 50
mm × 3 mm, is attached to the outer surface side end of the image display member 18a, and is stored in the casing 14 while being pressed against the inner surface of the casing 14 under a load. The display member 18a is held in the casing 14.

With this structure, external shocks and vibrations are transmitted from the casing 14 to the shock absorbing member 16 and absorbed and attenuated by the shock absorbing member 16, so that the shock and vibration are transmitted to the image display member 18a without being transmitted to the image display member 18a. Particles during image display can be prevented from moving due to external impact or vibration, and display images can be prevented from being disturbed.

The shock absorbing member 16 can be applied to a material other than αGEL as long as it can absorb or reduce external shock. For example, βGEL (trade name; manufactured by Geltech Co., Ltd.), γGEL (trade name;
Gel-like substances mainly composed of silicone such as Geltech Co., Ltd., θGEL (trade name; Geltech Co., Ltd.), foamed substances such as expanded polyethylene, expanded polypropylene and expanded polystyrene, rubber, elastomer, etc. Applicable.

In the image display device having such a configuration,
When a DC voltage of 150 V is applied to the display-side electrode 22 of the image display unit 10, a part of the negatively charged white particles 42 on the rear substrate 23 side is caused by the action of an electric field to cause the display substrate 20.
Start moving to the side. Further, 500 V is applied to the display side electrode 22.
Is applied, many white particles 42 move to the display substrate 20 side, and the display density is almost saturated. At this time,
The black particles 40 charged to the positive polarity move to the rear substrate 23 side. Thereafter, even if the voltage is set to 0 V, the particles on the display substrate 20 do not move, and the display density does not change.

As described above, the black particles 4 having different charging characteristics
0 and white particles 42 are mixed and sealed between opposing substrates,
By applying a desired electric field to the black particles 40 and the white particles 42 by applying a voltage between the substrates, the black particles 40 and the white particles 42 move between the substrates in directions opposite to each other. By repeatedly switching the polarity of the electrode, the direction of the electric field is switched, so that the black particles 40 and the white particles 42 reciprocate between the substrates. At this time, the black particles 40 are positively charged and the white particles 42 are negatively charged due to the contact between the moving particles and the friction caused by the collision of the particles with the substrate, and move in the opposite directions according to the electric field. .

When the polarity of the electrodes is fixed and the direction of the electric field is kept constant, the particles 40 and 42 move to the substrates 20 and 23 having opposite polarities in accordance with the respective charging characteristics. Therefore, by determining and fixing the polarity of the electrode for each position corresponding to the image data, a uniform high-density and high-contrast image without image unevenness is displayed.

In the first embodiment, the shock absorbing member 16 and the image display member 18a are stored in the casing 14, and the shock absorbing member 16 holds the image display member 18a in the casing 14. However, the present invention is not limited to this configuration. Instead of providing the casing 14, for example, as shown in FIG. 2, the entire image display member 18a is formed by a transparent shock absorbing member 16 such as a sheet-like αGEL. It is also possible to adopt a configuration of covering around.

(Second Embodiment) As shown in FIG. 3, an image display device according to a second embodiment
8b, a recording head 50 for generating an electric field at a position corresponding to the image data, the first counter electrode 51, and the image display member 18.
b, a refresh electrode 52 and a second counter electrode 53 for uniformly generating an electric field, and an image-formed image display member 18b
A control unit 58 that applies a voltage to the recording head 50 according to the image data, and controls the applied voltage so that an electric field according to the image data is applied to the image display member 18b. Displayed image display member 18
and a mounting table 56 on which b is mounted.

The recording head 50 is composed of, for example, a substrate made of an elastic material such as rubber, and a plurality of substantially hemispherical electrodes having a semi-elliptical cross section and projecting outward with a diameter of, for example, 100 μm. .

Since the substrate has elasticity, for example, even if the surface of the image display member 18b has irregularities, it is deformed according to the irregularities. Therefore, the state of contact with the image display member 18b is always good, and an electric field accurately reflecting image data can be applied to the image display member 18b.

The plurality of electrodes are arranged in a matrix with respect to one surface of the display substrate 20 which is a recording surface. That is, a plurality of, for example, three rows of electrode rows arranged at predetermined intervals along the width direction (that is, the main scanning direction) of the image display member 18b so as not to overlap in the sub scanning direction are arranged in a matrix. And An AC power supply and a DC power supply (not shown) are connected to each electrode via a connection control unit (not shown), and a voltage obtained by superimposing a DC voltage on an AC bias is applied.

The connection control section includes a switch having one end connected to the electrode and the other end connected to the AC power supply, and a switch having one end connected to the electrode and the other end connected to the DC power supply. It is composed of a plurality of switch pairs.

The switch pair is turned on and off by the control unit 58. Based on an instruction from the control unit 58, A is applied so that the voltage is applied only to the electrode at the position corresponding to the image data.
The C power supply and the electrode or the DC power supply and the electrode are electrically connected.

The refresh electrode 52 includes a pair of elastic rollers made of an elastic material. The elastic roller is composed of two conductive rubber rollers formed by adding carbon black to rubber and forming a cylinder having a diameter of, for example, about 20 cm, and is always connected to an AC power source and a DC power source (not shown). Is applied with a DC voltage.

The refresh electrode 52 is rotated with the image display member 18b sandwiched therebetween, so that the direction of the electric field applied to the image display member 18b by the recording head 50 according to the image data with respect to the image display member 18b. And apply a uniform electric field in the opposite direction.

The image display member 18b is provided between the transparent display substrate 20 forming the image display surface and the rear substrate 23 in a region defined by the spacer 26 provided, for example, in the first embodiment. Black particles 40 and white particles 42 as described in
In this configuration, particles of two colors having different colors and different charging characteristics are enclosed.

The display substrate 20 is composed of a hole transporting film. As such a hole transporting film, for example, N-methylcarbazole diphenylhydrazone, which is a hole transporting substance, is contained in a polyethylene resin. 40
% By weight and uniformly dispersed and then molded into a thickness of about 50 μm, or about 40% by weight of a hole transport substance β, β-bis (methoxyphenyl) vinyldiphenylhydrazone in a polyethylene resin. A material which is uniformly dispersed and molded into a thickness of about 50 μm as a charge transporting material can be used.

On the other hand, the back substrate 23 is formed of a film having a two-layer structure in which an electrode layer having a thickness of about 50 μm is formed on the charge transporting film. As the charge transporting film used for the back substrate 23, similarly to the display substrate 20, a hole transporting film that transports holes may be used, or an electron transporting film that transports electrons and a hole transporting film may be used. Films that transport electrons and electrons can also be used.

In the second embodiment, both the outer surface of the display substrate 20 and the outer surface of the rear substrate 23 are formed of, for example, a transparent glass having a thickness of 0.1 μm to prevent the accumulation of electrostatic charges. NR-121X which is a porous polymer film
By applying -9IPA (trade name; Colcoat Co., Ltd.) to the surface, the surface specific resistance is 1 × 10 ¹¹ Ω / cm.
In the following, each semiconductor is subjected to a semiconductive treatment so as to have a resistance of 1 × 10 ⁸ Ω / cm or more.

As an antistatic film, Colcoat N-
In addition to a siloxane-based antistatic film such as 114X (trade name; Colcoat Co., Ltd.), Colcoat NR-121X-
A polymer-based antistatic film, which is a transparent acrylic polymer film having flexibility such as 9IPA (trade name; Colcoat Co., Ltd.), or a conductive metal powder such as Colcoat SP-2001 (trade name: Colcoat Co., Ltd.) An olefin-based / polyester-based transparent polymer antistatic film, a surfactant-based antistatic agent applied thereto, or the like can be used. Each of them is advantageous in that it has high transparency and has little effect on image display characteristics. Note that an antistatic film formed of a polymer film is particularly preferable because it has excellent friction resistance and water resistance.

In the second embodiment, the black particles 40 and the white particles 42 described in the first embodiment are used as the particles sealed between the display substrate 20 and the rear substrate. However, as long as at least one type of colored particles is encapsulated, image formation is possible. Therefore, the types of particles are, for example, a case where both particles are insulating particles and a case where both particles are conductive particles and insulating particles. As in the case of a combination or the like, it can be appropriately changed. The display substrate 20 and the rear substrate 2
As for No. 3, an insulating material, a charge transporting material, or a photoconductive material can be used. Whichever material you apply,
Making the surface of the substrate semiconductive is effective for avoiding trouble due to static electricity from the outside.

Further, as an application of the second embodiment, an image display member on which an image has been formed may be mounted on the holder 30. The holder 30 is made of a transparent plastic with a sheet-like shock absorbing material attached to the inner surface.

As described above, the image display member 1 is
Storing 8b is preferable because it is effective not only to complement the strength of the thin substrate and increase the impact resistance, but also to reduce the influence of static electricity. In particular, when an electric field is applied from the outside as in the second embodiment, it is necessary to reduce the thickness of the substrate. Therefore, the separation from the outside by the holder 30 is effective. Also in this case, by providing the shock absorbing member 16 at the contact portion between the holder 30 and the image display member 18b, it is possible to effectively avoid the disturbance of the particles due to the shock. Of course, the antistatic film as described above may be further provided on the surface of the holder.

(Third Embodiment) As shown in FIG. 4, the image display apparatus according to the third embodiment has a pair of side electrodes 32 on the end facing surfaces of a pair of substrates facing each other. The image display member 18c includes a joint portion 35 that engages with an end side surface of the image display member 18c and is electrically connected to the side electrode pair 32, and the voltage control unit 12.

In the third embodiment, the display substrate 20 and the back substrate 23 can be formed using the same materials as those in the first embodiment. In the third embodiment, the side surface of the image display member 18c is provided in a concave portion, and the side electrode pair 32 is formed on two opposing inner surfaces of the concave portion. Side electrode pair 32
Is formed at the time of forming the image display member 18c, and is formed at the end of the ITO electrode portion without forming the electrode pad on the surface of the image display member. An insulating sealant 38 is provided on the side surface to prevent the side electrode pair 32 from contacting the outside.

The joint 35 has an engaging portion which engages with the concave portion. The engaging portion includes a first electrode 36a having one end connected to the voltage control section 12, and a second electrode 3 having one end grounded.
6b. When the joint 35 is engaged with the concave portion, the first electrode 36a is electrically connected to the side electrode provided on the display-side electrode 22, and the second electrode 3
6b are arranged so as to be electrically connected to the back side electrode 25 and not to contact each other.

With such a structure, the electrodes are not exposed on the surface of the image display member 18c, so that the electric field generated by the leak from the electrode portion causes the image display member 18c to display the image inside the image display member 18c. It is possible to always perform good image display without causing a problem such as disturbed particles and disturbed image display.

In the above-described embodiments, cases have been described for dealing with disturbances due to impact, disturbances due to static electricity, and disturbances due to leakage current. However, the present invention is not limited to these disturbances, and it is not limited to these disturbances. It can also be applied to disturbances due to stimuli, for example, chemical stimuli such as drugs and optical stimuli such as ultraviolet rays. For example, for a chemical stimulus such as a medicine, sealing around the image display medium with a chemical resistant adhesive is effective, and for an optical stimulus such as an ultraviolet ray, an ultraviolet absorbing material is used for the image display member 18a, It is effective to adopt a configuration provided on the surfaces of the holders 30 and 18b and 18c.

The structure of the image display medium described in the present embodiment is also an example.
The present invention can be applied to any image display member having a configuration in which various types of particles are enclosed and an image is displayed based on the color contrast of the particles.

[0072]

As described above, according to the present invention, image disturbance due to physical disturbance such as strong shock or vibration is minimized, and electrical disturbance such as static electricity or ultraviolet light and chemical disturbance are minimized. There is an effect that the influence on disturbance can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a schematic configuration of an image display device according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a schematic configuration of an application example of the image display device according to the first embodiment.

FIG. 3 is an explanatory diagram illustrating a schematic configuration of an image display device according to a second embodiment.

FIG. 4 is an explanatory diagram illustrating a schematic configuration of an image display device according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Image display part 12 Voltage control part 14 Casing 16 Shock absorption member 18a, 18b, 18c Image display member 20 Display substrate 22 Display side electrode 23 Back substrate 24, 28 Surface protection layer 25 Back side electrode 26 Spacer 30 Holder 32 Side electrode pair 35 Joint part 36a First electrode 36b Second electrode 38 Sealant 40 Black particles 42 White particles 50 Recording head 51, 53 Counter electrode 52 Refresh electrode 54 Transport roller pair 56 Mounting table 58 Control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Machida 430 Green Tech Nakai, Nakai-cho, Ashigara-gun, Kanagawa Inside Fuji Xerox Co., Ltd. Inside (72) Inventor Ken Matsunaga 430 Green Tech Nakai, Nakai-cho, Ashigara-kami, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. Inventor Minoru Koshimizu Fuji Xerox Co., Ltd. 430 Green Tech Nakai, Nakai-cho, Ashigara-gun, Kanagawa Prefecture Fuji Xerox Co., Ltd. Shota Ebina, Kanagawa Prefecture Hongo 2274 address Fuji zero box Co., Ltd. Ebina house (72) inventor Nobuyuki Nakayama Kanagawa Prefecture ashigarakami district Nakai-cho, Sakai 430 Green Te-click a paddle Fuji Xerox Co., Ltd. F-term (reference) 5G435 AA16 BB11 CC12 GG16 GG32

Claims (8)

[Claims] 1. A method comprising: a pair of substrates, at least one of which is light-transmissive and disposed to face each other, and at least one kind of colored particles sealed between the pair of substrates;
An image display medium that displays an image by the color of the colored particles arranged on one of the paired substrates, wherein a disturbance protection member is provided on at least a part of an outer surface of the image display medium. Image display medium. 2. The image display medium according to claim 1, wherein the disturbance protection member is a shock absorber covering at least a part of a periphery of the image display medium. 3. The image display medium according to claim 1, wherein the disturbance protection member is a housing that holds the image display medium via a shock absorbing material. 4. The image display according to claim 1, wherein the disturbance protection member is an antistatic film covering at least a part of a periphery of the image display medium. Medium. 5. The image display medium according to claim 1, wherein the disturbance protection member is configured to be detachable from the image display medium. 6. The image display medium according to claim 1, further comprising a pair of electrodes for generating an electric field in a space formed between said pair of substrates, wherein said pair of electrodes is sealed in said image display medium. Any one of claims 1 to 5
Item 15. The image display medium according to Item 1. 7. A pair of substrates, at least one of which is light-transmissive and arranged to face each other, at least one kind of colored particle group sealed between the pair of substrates, And a pair of electrodes for generating an electric field in a space formed between the substrates, the image displaying an image by a color of the colored particle group arranged on one of the pair of substrates by the electric field. An image display medium, wherein the pair of electrodes is sealed in the image display medium. 8. An image using the image display medium according to claim 1 and comprising a display control unit for generating an electric field between said pair of substrates in accordance with image information. Display device.