JPH01120594A - Image display device - Google Patents

Abstract

PURPOSE: To display multicolor and to obtain an image display device which lessens color mixing of these colors by impressing prescribed energy on flowable ink to form an ink image and transferring this image to a display member, then making adhere fine powder thereto. CONSTITUTION: An ink transfer roller 1 is arranged in an ink vessel 3 in which the flowable ink 2 is housed in such a manner that this roller is partly submerged in the ink 2. The roller is disposed rotatably in an arrow A direction while the ink 2 in the vessel 3 is transferred. The ink 2 is transferred to the surface of the roller 1 via a layer thickness regulating means 4 and is imparted with electric energy like image patterns by a recording head 5. The ink image imparted with tacky adhesiveness by the impartation of the energy thereto is thus formed. This ink image is transferred to the display member 7 rotated in an arrow B direction by pulleys 6A, 6B. The transferred ink image 8 is moved according to the rotation of the member 7 and the fine powder 102 is made to adhere to the surface of the image ink 8 by the applying roller 101 of a fine powder applying means 100. The multicolor display is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device, and particularly to an image display device capable of displaying a color image using fluid ink.

[Conventional technology]

Means for outputting image information include those that display images such as characters and figures using a cathode ray tube, and slide projects and overhead projects that are often used in conferences and lectures.

However, the former has the problem that increasing the size of the display screen increases the size of the device and degrades the resolution, while the latter allows the display screen to be easily increased in size, but outputs directly from intermediate storage media such as recording tapes and disks. There was a problem that it could not be converted into a visible image in the field.

Therefore, as a means of image recording, the present applicant transferred fluid ink in the form of a film using an ink transfer means, selectively applied a predetermined energy to this ink, and created an adhesive film on an image pattern. proposed an apparatus for forming an ink image and transferring and displaying this ink image on a display member (patent application 1986).
-198189) According to this device, images can be repeatedly displayed on the display member without replenishing ink, and running costs can be extremely low.

[Problem that the invention seeks to solve]

However, the above-mentioned apparatus is intended for monochrome printing, and there is a problem in that sufficient consideration has not been given to color printing.

It is an object of the present invention to provide an image display device which further develops the above-mentioned device, enables multi-color display, and reduces the amount of color mixing among these colors.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an image display device capable of transferring fluid ink to a display member in response to selective application of energy, the fluid ink contained in an ink container being transferred. an ink transfer means for selectively applying electric energy to the ink transferred by the ink transfer means; and an energy application means for selectively applying electrical energy to the ink transferred by the ink transfer means; , a display member for displaying an image of the ink, and a fine powder application means for causing fine powder to adhere to the ink image formed on the display member.

[Effect]

According to the present invention, an ink image with changed transfer characteristics is formed by transporting fluid ink by the ink transport means and applying electric energy i according to an image signal to the ink,
A predetermined image is recorded and displayed by transferring the ink image to a display member.

Then, a predetermined colored fine powder is made to adhere to the ink image formed on the display member using a fine powder applying means.

By performing the above operation for each predetermined color, a multicolor display can be obtained.

〔Example〕

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

FIG. 1 is a sectional view of essential parts of an image display device according to a first embodiment of the present invention.

First, to explain the overall general configuration, an ink transfer roller 1 serving as an ink transfer means is arranged in an ink container 3 containing fluid ink 2 so that a part of it is submerged in the ink 2 ( In FIG. 1, the ink transfer roller 1 appears to be buried in the ink 2 because the recording operation is in progress), and the ink 2 in the container 3 is transferred in the direction of arrow A (counterclockwise). It is rotatably installed.

The ink 2 has fluid film-forming properties and is substantially non-tacky under normal conditions, but becomes sticky when a predetermined amount of energy, for example electrical energy, is applied. Therefore, when the ink transfer roller 1 rotates, the layer thickness regulating means 4 transfers the ink to the surface of the ink transfer roller 1 with a constant layer thickness.

The ink 2 formed in a certain layer on the surface of the ink transport roller 1 is applied with electrical energy in an image pattern by a recording head 5 as an energy application means controlled by a control means (not shown), and this energy application causes A tacky ink image is formed.

The ink image is moved in the direction of arrow B (
It comes into contact with the display member 7 rotating clockwise) and is transferred onto the display member 7. On the other hand, the ink 2 that has not been transferred to the display member 7 is stored again in the ink container 3 as the ink transfer roller 1 rotates and is used again.

The ink image 8 transferred to the display member 7 moves as the member 7 rotates, and fine powder 10 is applied to the surface of the ink image 8 by the applying roller 101 of the fine powder applying means 100.
2 is resistant to adhesion.

In addition, 9 is a cleaner blade, which is brought into contact with the display member 7 to erase the image when rewriting the image;
is a corona discharge static eliminator for neutralizing the display member 7.

Next, in this example, a case where two-color display is performed will be explained.

In this example, the ink 2 described above is colored orange with a pigment or dye in advance.

Therefore, the image information of the first color is selectively applied to the surface of the ink 2 by the recording head 5, and the part imparted with adhesiveness by this application of energy is transferred onto the display member 7 as an orange ink image 8. Ru.

Next, on the surface of this orange ink image 8, blue fine powder 102 (or black may be used), which is preferably a complementary color to the color of the ink 2, is applied to the display member 7 using the fine powder applying roller 101. It is made resistant to adhesion by contacting and rotating and utilizing the tackiness of the ink 2. Then, the orange ink image 8 is colored black by the complementary color fine powder 102 and at the same time its tackiness decreases, and eventually a non-adhesive black ink image 8A is formed.

Thus, when the display member 7 is rotating and the display of the first color image information per screen is completed, the application roller 101 of the fine powder application means 100 is stopped from contacting the display member 7, and furthermore, the display of the second color image information is stopped. Image information is selectively applied to the surface of the ink 2 by the recording head 5.

Therefore, in this case, the black ink image 8A is transferred onto the display member 7 on which it is formed, but since the fine powder applying means is in a non-contact state, the orange ink image 8 is transferred to the display section E as it is. As a result, a two-color image of black and orange can be displayed.

Even if multiple transfers are performed as described above, since the first transferred image is non-viscous due to the fine powder, it will not be transferred to the ink feed roller 1 side, causing disturbance with the image and ink 2. Color mixing is prevented.

Next, a second embodiment of the present invention will be described based on FIG. 2.

In the embodiment described above, the ink image formed on the ink layer on the ink transport roller 1 was directly transferred to the display member 7, but in this embodiment, an intermediate transfer medium is interposed between the two.

That is, an intermediate transfer roller I5 is provided between the ink transfer roller 1 and the display member 7, and the ink image formed on the ink layer on the ink transfer roller 1 is transferred to the intermediate transfer roller 15, and this is further transferred to the display member 7. It is to be transcribed into.

Since the other configurations and operating procedures are the same as in the previous embodiment, the same reference numerals are given to the same functional parts to avoid redundant explanation.

Therefore, in this case, compared to when the ink 2 comes into direct contact with the display member 7, transfer of the image to the ink 2 can be further prevented, and the effect of preventing image disturbance and ink color mixing can be further enhanced.

Furthermore, a third embodiment of the present invention will be explained based on FIG.

In contrast to the above-mentioned first and second embodiments in which a multicolor display is realized using one image transfer means and one fine powder application means, this embodiment uses a fine powder application means. This is an example in which further multicolor display is possible by increasing the number of display elements.

That is, in this example, three fine powder application means 300
．． 400 and 5 (10) are provided in parallel below the pulley 6B of the display means 7, and are driven in the left-right direction by a drive means (not shown) in order to selectively bring them into contact with the display means 7. be.

Further, as the ink 2 used in this example, it is preferable to use a colorless and transparent ink 2 that does not contain pigments or dyes.
In some cases, a white ink containing a white pigment may be used.

The first fine powder applying means 300 has a first color such as red, the second fine powder applying means 400 has a second color such as blue, and the third fine powder applying means 500 has a second color such as blue. For example, black is set as the third color.

Since the other configurations are the same as those in the first embodiment, the same reference numerals are given to the same functional parts to avoid redundant explanation.

Therefore, a case will be described in which three-color display is performed in this example.

The image information of the first color is transferred to the ink 2 by the recording head 5.
The ink is selectively applied to the surface of the ink, and the portion imparted with tackiness by this application of energy is transferred onto the display member 7 as a transparent or white ink image 8.

When the display member 7 further moves from this transfer position, red fine powder 30
2 adheres to the ink image 8, forming a non-adhesive red ink image 8A.

Then, when the display of the first color image per screen is completed, the second fine powder applying means 400 is moved to the contact position, and similarly, the second color image information is applied by the recording head 5, and the blue ink image 8B is formed.

Furthermore, a third color black ink image 8C is formed in the same procedure, and finally a three-color image of red, blue, and black is obtained.

In this case, even if overlapping transfer is performed as in the previous embodiment, the previously transferred image is non-viscous due to the fine powder, so it will not be transferred to the ink transfer roller 1 side, and the image will not be disturbed or Color mixing of inks is prevented.

Next, a fourth embodiment of the present invention will be described based on FIG. 4.

In this example, an intermediate transfer roller 15 is provided between the ink transport roller 1 and the display member 7, and furthermore, the second! , second and third
Fine powder application means 300, 400, and 500 are arranged vertically on the back side of the display member 7, and a cleaner blade 9 is provided below the pulley 6B.

The other configurations and operating procedures are the same as in the third embodiment, so their explanations will be omitted.

In this example, compared to the third example, it is possible to further prevent the image from being transferred to the ink 2, further increasing the effect of preventing image disturbance and ink color mixing, and adding fine powder. The installation space for the means can be reduced, which is advantageous in terms of layout.

Next, a fifth embodiment of the present invention will be described based on FIG.

This embodiment differs from the above-mentioned embodiments in that it includes two image transfer means X and Y and one fine powder application means 6 between them.
00 is provided to enable two-color display in a short time. Further, instead of the corona discharge static eliminator 10, a static eliminator brush IOA is used.

That is, in this example, the first image transfer means X has the same structure as shown in the first and third embodiments, and the second image transfer means Y has the same structure as shown in the second and fourth embodiments. An intermediate transfer roller 15 having the same configuration as that used in the previous embodiment is used.

In this example, the first image transfer means X first transfers image information of the first color, for example, black, to the recording head 5.
The first ink image 108A is applied to the surface of the ink 2 by
The image is transferred to the display member 7 as a.

Next, a colorless and transparent fine powder 60 is applied to the first ink image 108A by the applying roller 601 of the fine powder applying means 600.
2 is attached to obtain a non-adhesive ink image 108B with reduced or no adhesiveness.

On the other hand, in the second image transfer means Y, image information of a second color, for example, red, is applied to the surface of the ink 2 by the recording head 5, and the first non-adhesive ink image sent through the fine powder application means 600 is applied to the surface of the ink 2. The second ink image 208 is transferred while synchronizing with the image 108B on the screen.

Here, the first ink image 108B is non-adhesive, and since the intermediate transfer roller 5 is used, the transfer of the first ink image 108B to the intermediate transfer roller 15 is extremely small, and therefore the image is not disturbed. It is possible to display multiple colors without color mixing and with less color mixture.

Furthermore, since a multicolor image can be obtained within a small movement range of the display means 7, one screen image can be formed in a short time.

Next, a sixth embodiment of the present invention will be described based on the sixth factor.

In this example, the ink 2' obtained by imparting magnetism to the ink 2 in the second image transfer means Y described in the fifth example is used, and a magnet 16 is arranged on the back surface of the surface member 7.
Ink image 20 from intermediate transfer roller 15 to display member 7
The transfer efficiency of 8 is increased by magnetic force.

This is because the display member 7 has a smooth surface and is non-absorbent to ensure easy cleaning, as will be described later.
This is to promote transferability by attracting the ink image onto the display member 7 with the suction force of the magnet 16.

Incidentally, FIG. 9 shows an exterior embodiment of an image display device incorporating each of the embodiments having the above-described configuration.

In the figure, 20 is the exterior of the device, and a display window 2OA is provided at a position facing the display member 7 described above, through which the ink image transferred onto the display member 7 can be visually recognized. . Further, 21 is a keyboard for performing predetermined input.

Next, each component used in each of the above-mentioned embodiments will be explained in detail.

First, the ink transfer roller 1 is made of a material that can transfer fluid ink 2, which will be described later, by forming a layer on its surface.
For example, a conductor made of metal such as stainless steel, aluminum, or iron is formed into a cylindrical shape, and is configured to be driven and rotated at a constant speed in the direction of arrow A by a motor (not shown).

The surface of the ink transfer roller 1 made of the above-mentioned material may be a smooth surface, but is preferably appropriately roughened in order to further enhance the ability to convey and support the fluid ink 2.

Next, the fluid ink 2 transferred by the ink transfer roller 1 will be explained. This ink 2 has a fluid film forming property that flows under the application of a certain external force and forms an ink film. Specifically, as the ink transfer roller 1 rotates, an ink layer is formed on the surface of the roller 1 and is transferred. Further, it is preferable that the ink 2 has a property of being able to restore its adhesiveness over time after being cut by an external force. That is, it is preferable that the ink lumps have a property such that when they come into contact with each other, the interface disappears and they become one piece.

The ink 2 having the above-mentioned properties is an ink having a gel state in a broad sense in which the solvent is held by a cross-linked structure substance, or an ink having a relatively high viscosity (preferably 5000 cps or more at 25° C.) in which particles (the particle size is preferably is 0.1~10
An ink having a sludge state obtained by dispersing particles of 0 μm (5 μm, more preferably 1 to 20 μm) is preferably used.

Inks having properties of both gel-like inks and sludge-like inks are more preferably used. Specific examples of this ink 2 include, for example, Japanese Patent Application No. 175191/1986 filed by the applicant of the present invention,
Inks described in No. 36904 and the like are preferred.

Such an ink 2 has fluid film-forming properties, but is substantially sticky and becomes sticky when a predetermined energy (for example, electrical energy, thermal energy, etc.) is applied. have a property. Note that the term "adhesiveness" used herein refers to selective adhesiveness, and when the ink 2 is brought into contact with an object on the display member 7, a part of the ink 2 separates from the entire ink and adheres to the object. In other words, it doesn't matter whether the ink is sticky or not.

Therefore, when the ink layer formed on the surface of the ink transport roller 1 is in a state where no energy is applied, even if the ink 2 comes into contact with another medium, for example, the display member 7, the ink layer does not substantially affect the member 7. is not transcribed. This is because in gel ink, the solvent is held in a cross-linked structure (except for a small amount of solvent), so the ink is not transferred to the display member 7, and the ink is in a sludge state. In other words, it is thought that because the particles are closely arranged at the interface, the solvent portion of the ink becomes difficult to come into contact with the display member 7 and is not transferred to the display member 7.

On the other hand, when electrical energy is applied to the gel-like ink or sludge-like ink, the crosslinked structure of the gel-like ink and the particle arrangement state of the sludge-like ink change, resulting in changes in these properties. It is thought that adhesiveness is imparted to the fluid ink according to the application of energy.

Further, when the ink 2 is coated on the ink transfer roller 1, it has properties as a plastic body, and conversely, after being applied with energy by the recording head 5, which is an energy applying means, and reaching the display member 7, the ink 2 has properties as a plastic body. It is preferable that the material has properties as an elastic body.

For this reason, the ink 2 having a certain degree of viscoelasticity (complex elasticity having an elastic term and a viscous term) is preferably used.

The range of viscoelasticity is, for example, as shown in FIG. 7(A),
As shown in (B), a sample of ink 2 with a diameter of 2511 and a thickness of 2+ nm was measured using a rheometer PMS-800 (
(manufactured by Rheometrics, Inc. in the United States), the sample was set at an angular velocity of 1 rad/sec in the direction of the arrow (shear direction) shown in the figure.
When the complex elastic modulus G is obtained by giving a sinusoidal strain r of ``G'': Storage modulus G'': Loss elastic modulus The value of the ratio G''/G' between the storage elastic modulus G' and the loss elastic modulus G'' is approximately 0.1.
~lO is preferably used.

In the complex modulus of elasticity, the value of G''/G' is 0.1
If the value of G″/G′ exceeds 10, the behavior as a plastic body will be insufficient, resulting in insufficient ink coating on the ink transfer roller 1, and if the value of G″/G′ exceeds 1O, the behavior as an elastic body will be insufficient. This is because elastic recovery from the recording head 5 to the display member 7 becomes insufficient.

Note that the size of the sample and the method of applying distortion are values that are considered appropriate for the image display device.

Next, the layer thickness regulating means 4 is arranged upstream of the recording head 5 with respect to the rotational direction of the ink transfer roller 1, and is for coating the surface of the ink transfer roller 1 with the ink 2 at a constant layer thickness. It is. In this embodiment, the layer thickness regulating means 4 is composed of a rotatable roller member, and the outer circumferential surface of the roller member 4 is approximately 0.3 to
They are spaced 3mm apart.

The layer thickness is regulated by the roller member 4, and the thickness of the ink layer formed on the surface of the ink transfer roller 1 is controlled by the roller member 4 and the ink transfer roller 1 due to the balance effect peculiar to the viscoelastic body. It is usually slightly larger than the interval between At this time, it is desirable that the distance between the roller member 4 and the ink transport roller 1 be set slightly smaller than the thickness of the ink layer to be set.

The layer thickness of the fluid ink 2 formed on the surface of the ink transfer roller 1 depends on the fluidity or viscosity of the ink 2, the material or roughness of the surface of the ink transfer roller 1, or the rotation speed of the roller 1. At the ink transfer position where the ink transport roller l faces the display member 7, the distance is approximately 0.1 to 5 mm, more preferably 0.5 to 3+n, although it varies depending on the situation.
It is preferable that it is about m.

If the layer thickness of this ink 2 is less than 0.1 mm, it will be difficult to form a uniform ink layer on the ink transfer roller 1, and if the layer thickness exceeds 5 mm, it will be difficult to form a uniform ink layer on the ink transfer roller 1. , it becomes difficult to transport the ink 2, and it also becomes difficult to energize the ink transport roller 1 from the recording head 5 via the ink 2.

Next, the recording head 5, which is the energy applying means, will be explained. In this embodiment, the recording electrode 5 is used to apply electrical energy.

As shown in FIG. 8, the recording electrode 5 has a structure in which a plurality of electrode elements 5b made of metal such as copper are arranged in a line on a base 5a made of glass epoxy, alumina, glass, etc. An insulating film 5C made of polyimide or the like is provided on a portion of the element 5b other than the tip, that is, a portion other than the portion that contacts the ink 2, and the ink transfer roller 1 is grounded with a ground 9. 1 and the electrode element 5b through the ink 2. The portion of the electrode element 5b exposed from the insulating film 5C is preferably plated with gold, platinum, rhodium, or the like, and from the viewpoint of durability, platinum plating is more preferable.

When the recording electrode 5 is arranged, it is preferable to arrange it so that the electrode element 5b is slightly submerged in the ink layer formed on the ink transport roller 1.

The amount of immersion is set to about 0 to 1 mm, more preferably about 0.1 to 0.5+ nm. By slightly immersing it in the ink layer in this way, the energizing effect can be further enhanced. Incidentally, even if the electrode element 5b is immersed in the ink layer as described above, since the ink 2 has viscoelasticity, it recovers elastically.

Further, when the electrode element 5b is immersed in the ink layer as described above, the end surface of the substrate 5a and the electrode element 5b in FIG.
It is preferable that the difference in level between the end face and the end face is in the range of about 0 to 100 μm, and if possible, it is desirable that both end faces have no step difference and are formed on the same surface. This is because if the level difference is large, the ink image formed by energization from the electrode element 5b may be rubbed and destroyed by the end surface of the substrate 5a, causing disturbances in the displayed image.

For example, when using guar gum crosslinked with borate ions as the crosslinked structure material of the ink 2, the amount of current applied to the recording electrode 5 is the amount required to destroy this crosslinked structure and cause an electrochemical change. The amount of current applied is sufficient. Therefore, the amount necessary to transfer electrons to and from the crosslinking agent added in a small amount of about several hundred ppm to ink 2 is sufficient, and compared to the amount of current applied when applying thermal energy with a thermal head in thermal transfer, etc. Therefore, it is sufficient to apply a low energy of about 1/10100, and by applying this energy, the ink 2
becomes sticky.

Next, the display member 7 is to which the ink image imparted with adhesiveness by applying the energy is transferred, and is made of a polyethylene terephthalate resin sheet having a thickness of 100 to 300 μm formed into an endless belt shape. A hook is passed between a driving pulley 6A and a driven pulley 6B, which are driven and rotated by a motor (not shown), so that they can rotate in the direction of arrow B. Further, the display member 7 is configured to rotate while being in contact with the surface of the ink transfer roller 1 and the ink layer formed on the transfer peeler 1 by about 0.1 to 100 cm.

The display member 7 may be made of any material as long as it can transfer an ink image, but in addition to the polyethylene terephthalate, resin films such as polyethylene, polypropylene, polyester, vinyl acetate, polycarbonate, polystyrene, etc. polyvinyl chloride,
Polyvinyl hydrochloride polymer, polyvinyl chloride, polyvinylidene chloride, polyamide, polyimide, cellulose acetate, ionomer, polyethylene, polysulfone, nylon, polyphenylene sulfide, polyvinylidene chloride and the like are also preferably used.

Further, at the ink transfer position where the sticky ink image is transferred to the display member 7, an appropriate shearing force is applied to the layer of ink 2 sandwiched between the display member 7 and the ink transfer roller 1. It is also desirable. Therefore, it is preferable that the circumferential speed of the display member 7 is set to be equal to or smaller than the circumferential speed of the surface layer of the ink layer on the ink transport roller 1. Depending on the characteristics of the non-adhesive ink, the peripheral speed of the display member 7 may be set to be approximately equal to or slightly larger than the peripheral speed of the surface layer of the ink layer, taking into account the elastic deformation of the ink. good.

Next, a cleaner brush 9 as a cleaning member is made of urethane rubber or the like, and is provided in an inclined state, with the upper end of the brush 9 being displayed with reference to the transfer position where the ink image is transferred to the display member 7. It abuts on the upstream side of the member 7 in the rotational direction, and its lower end is inclined toward the inside of the collected ink container. Therefore, when the ink image transferred onto the display member 7 reaches the cleaning position as the display member 7 moves, it is removed by the cleaner brush 9 by 1 m from the top of the display member 7, and the ink is transferred by gravity to the cleaner brush 9. The ink collection container is configured to be stored within the ink collection container.

Next, a fine powder applying means (100, 300, 400, 50
0,600), it is preferable that the fine powder adheres only to the adhesive ink image immediately after being transferred to the display member 7, and for this purpose, the fine powder applying rollers (101, 301, 40
1°501.601), it is desirable to use static electricity to attract and hold the fine powder.

As a means for this purpose, a known electrophotographic development method may be used. As this electrophotographic development method, so-called fur brush development method, touchdown development method, cascade development method, magnetic brush development method, etc. can be used.

In addition, in these electrophotographic development methods, the fine powder is held by electrostatic force, so in each of the above-mentioned embodiments, in order to prevent this fine powder from sticking to anything other than the ink image on the display member 7 due to the electrostatic force, , corona discharge static eliminator 10 or static eliminator brush I
The display member 7 is neutralized using OA.

Further, as the fine powder, a resin toner used in electrophotographic development may be used, and pigments and dyes of the desired color are mixed as necessary to color the toner.

(Effects of the Invention) As is clear from the above description, according to the present invention, a predetermined energy is applied to fluid ink to form an ink image, and after the ink image is transferred to a display member, fine powder is appropriately removed. By displaying a color image using a multi-color image, it is possible to obtain a multi-color image display device in which there is no image disturbance and there is extremely little risk of ink color mixing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing a first embodiment of the present invention, Fig. 2 is a sectional view of essential parts showing a second embodiment of the invention, and Fig. 3 is a sectional view of main parts showing a third embodiment of the invention. 4 is a sectional view of essential parts showing a fourth embodiment of the present invention. FIG. 5 is a sectional view of essential parts showing a fifth embodiment of the present invention. 7 is an explanatory diagram showing a method for measuring viscoelasticity, FIG. 8 is a perspective view showing a part of the recording head, and FIG. 9 is a cross-sectional view of a main part showing a sixth embodiment of the invention. FIG. 3 is a partially cutaway perspective view showing the external shape of an example. DESCRIPTION OF SYMBOLS 1... Ink transfer roller, 2... Ink, 5... Recording head, 7... Display member, 100. 300, 400, 500, 600... Fine powder application means. No. 6 of the lower teeth plane showing Nezemei's funeral 6θ x Hongu Idaq
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Claims (1)

[Scope of Claims] An image display device capable of transferring fluid ink to a display member in response to selective application of energy, comprising: an ink transfer device for transporting the fluid ink contained in an ink container; means for selectively applying electrical energy to the ink transported by the ink transporting means; transferring the ink whose transfer characteristics have changed in accordance with the selective application of the energy, and forming an image of the ink; An image display device comprising: a display member for displaying an ink image formed on the display member; and a fine powder application means for depositing fine powder on an ink image formed on the display member.