JPH05246134A - Image display - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a novel image display device that has never existed before. A belt-like image forming material having a thin surface layer in which the receding contact angle is reduced by being heated in contact with the recording auxiliary agent and the receding contact angle is increased by heating in the absence of the recording auxiliary agent is used as a thin surface layer. The image carrier 10 formed on the substrate is displaced in a desired direction, and the receding contact angle of the surface of the image carrier is position-selectively reduced by the image forming means 14, 16 and 18 according to the image signal. A latent image is formed in accordance with the image signal by using the ink, the latent image is visualized with ink, and the obtained visible image is planarly displayed at the display position A. After the display, the cleaning means 20 removes the visible image from the surface of the image carrier, and the latent image erasing means 2
In step 2, the image carrier is uniformly heated in the absence of a recording aid to erase the latent image.

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.

[0002]

2. Description of the Related Art A receding contact angle is decreased by being heated in contact with a recording aid which is a solid or a liquid or a vapor which becomes a liquid or a vapor by heating. A material having a large receding contact angle is known (Japanese Patent Laid-Open No. 3-2051).
No. 85).

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel image display device using the above-mentioned materials as an image forming material.

[0004]

An image display device of the present invention is a device for displaying image information given as an image signal as a visible image, and comprises an image carrier, a carrier driving means, and an image forming means. A cleaning unit and a latent image erasing unit. The image signal may be, for example, one obtained by reading a document, or one generated by an information device such as a computer or a word processor.

The "image carrier" is heated in contact with the recording aid to reduce the receding contact angle,
An image forming material having a large receding contact angle due to heating in the absence of a recording auxiliary is formed as a thin surface layer on a belt-shaped substrate. The recording aid is a solid or a liquid or vapor that turns into a liquid or vapor by heating. The phrase "the liquid becomes vapor or liquid by heating" means "liquefy or sublimate at a temperature equal to or lower than the temperature at which the receding contact angle of the recording medium starts to decrease".

The "carrying member driving means" is a means for displacing a part of the image carrying member in a desired direction while flattening it at the display position. The "image forming means" position-selectively reduces the receding contact angle of the surface of the image carrier according to the image signal to form a latent image according to the image signal, and visualizes the latent image with ink. The "cleaning means" removes the visible image formed by the ink on the surface of the image carrier from the surface of the image carrier. The "latent image erasing unit" uniformly erases the latent image by heating the surface of the image carrier in the absence of a recording aid. It goes without saying that the image formation by the image forming unit, the visible image removal by the cleaning unit, and the latent image erasing by the latent image erasing unit are performed at positions other than the display position.

Although the image carrier has a belt shape, the belt may have an endless belt shape (claim 6) or an endless belt shape (claim 7). When the image carrier is in the shape of an end belt, the image carrier is driven to be displaced in the forward and reverse directions between the pair of winding portions (claim 6). Therefore, in this case, the desired direction is "an arbitrary direction between the pair of winding portions, which is the forward and reverse directions". When the image carrier is in the form of an endless belt, the image carrier is cyclically displaced and driven in a predetermined direction (claim 7). Therefore, the "desired direction" in this case is the predetermined direction.

The above-mentioned "image forming means" is an image writing means for position-selectively heating the image carrier from the front side or the back side in accordance with an image signal, and the surface of the image carrier at the image writing section by the image writing means. A recording auxiliary agent contact means for contacting the recording auxiliary agent on the side, and a developing means for visualizing the latent image by supplying ink to the surface of the image carrier on which the latent image has been written and formed by the image writing means. Alternatively, an image writing means for position-selectively heating the image carrier from the front surface side or the back surface side in accordance with an image signal, and a coloring agent (dye, pigment, etc.) as a recording aid. Ink contacting means for contacting the ink added with the ink to the surface side of the image carrier at the image writing part by the image writing means may be configured. ). As a method of bringing the recording aid or ink into contact with the surface of the image bearing member, a method of supplying a liquid recording aid or ink to the surface or a method of bringing a solid recording aid or ink into contact with the surface, Alternatively, it is possible to use a method in which a recording aid or ink is turned into steam and sprayed onto the surface.

Further, in the case of the image display device according to the second aspect, the "developing means" may be constituted as a color developing means for selectively supplying the three color inks forming the color image onto the surface of the image carrier. Good (Claim 4). In the case of the image display device according to claim 3, the "image forming means" includes three image writing means to which three types of color image signals for color images are separately input, and these three image writing means. It is also possible to provide each image writing unit with three ink supply means for supplying ink of a color corresponding to the color image signal (claim 5).

Further, rolling means "rolling an ink image forming a visible image on the surface of the image carrier" may be provided between the image forming means and the display position (Claim 8). A drying means for drying the ink image forming the visible image may be provided between the unit and the unit (claim 9).

Furthermore, the belt-shaped substrate may be light-transmissive (transparent and diffuse-transmissive), and "illuminating means for illuminating the display position from the back side of the image carrier" may be provided on the back side of the image carrier. (Claim 10). In this case, the image of the display section displayed by the illuminating means may be formed on the screen by the image forming lens to project the image (claim 11).

As an image forming material, Japanese Patent Laid-Open No.
Various materials disclosed in Japanese Patent No. 205185 can be appropriately used. In addition, the material of the substrate can be used without particular limitation as long as it is a material that is not easily thermally deformed at a temperature of 200 ° C. or less. Suitable examples are polyester and PE
Examples thereof include T, FEP, and polyimide. The ink (including the case where it also serves as a recording aid) may be oil-based or water-based.

[0013]

[Function] When the receding contact angle is θ, the surface tension of solid in air: γ, solid-liquid interfacial tension: γ _g , surface tension when liquid is in contact with its saturated vapor: γ _g1 , parallel surface tension: π _e , surface tension: γ _i , surface tension of solid without adsorption layer: γ _s tan θ = (γ / γ _g1 ) (γ _s −γ _g −π _e + γ _i ) It is a given physical quantity. When the receding contact angle: θ is small, the surface of the object is easily wet with the liquid, and when the receding contact angle: θ is large, the surface of the object is easy to repel the liquid.

Therefore, the image forming material, which has a small receding contact angle by being heated in contact with the recording auxiliary agent and has a large receding contact angle by heating in the absence of the recording auxiliary agent, is used as a thin surface layer of the belt. When the surface layer of the image carrier formed on the substrate in the shape of a ring is position-selectively heated according to the image signal by a thermal head or the like while in contact with the recording aid, the pattern of the portion where the contact receding angle becomes small As a result, a latent image can be formed according to the image signal. This latent image portion is easily “wetted” by the ink, and the ink “repels” at the portion where the contact receding angle does not become small. Therefore, if the latent image is supplied with ink, a visible image corresponding to the image signal can be obtained as an ink image. It is possible to display an image by presenting the image carrier portion having the ink image in a flat shape on the display unit.

The thickness of the surface layer formed by the image forming material on the surface of the substrate is as thin as a few μm or less, and therefore the appearance of the image bearing member is determined by the material of the substrate, and it may be transparent or white as the substrate material. It is possible to display a visible image satisfactorily by using a display image close to.

[0016]

EXAMPLES Specific examples will be described below. In FIG. 1, reference numeral 10 indicates an image carrier. Image carrier 10
Is an endless belt-shaped substrate on which a thin surface layer is formed by the above-mentioned image forming material, and is wound around a pair of rollers 12A and 12B. Roller 12B
Is a drive roller, which is rotated by a motor M in the direction of the arrow. By this rotation drive, the image carrier is cyclically displaced counterclockwise (a predetermined direction). Therefore, the rollers 12A and 12B and the motor M constitute "carrier driving means".

The portion indicated by the symbol A is the "display position",
The image carrier 10 is stretched in a plane at this display position. A thermal head 14 is provided below the roller 12B. Micro heat generating elements are arranged on the thermal head 14 linearly in close contact with each other in a direction orthogonal to the drawing. The thermal head 14 is arranged so that the heat generating element array is very close to the surface of the image carrier 10. The deployment position is set.

In this embodiment, the thermal head 1
A liquid recording auxiliary agent 16 is held in the vicinity of the surface 4 of the image carrier 10 by the surface tension, and the surface of the image carrier is in contact with the liquid recording auxiliary 16 in the vicinity.

Therefore, when the image signal is applied to the thermal head while rotating the image carrier 10 counterclockwise at a predetermined speed, the surface of the image carrier is brought into contact with the recording auxiliary agent 16 by each heat generating element. It is position-selectively heated according to the image signal. Since the receding contact angle becomes smaller in the heated portion, a latent image is formed as a collective pattern of the portions having the smaller receding contact angle. The liquid recording aid 16 is appropriately replenished as needed by a replenishing means (not shown). Therefore, the thermal head 14 is the "image writing means" in this example, and also constitutes the "recording auxiliary agent contacting means" together with the replenishing means.

The latent image formed as described above moves with the rotation of the image carrier 10 and is visualized by the developing means 18. The developing means 18 is impregnated with ink by a sponge roller, and is contact driven by the peripheral surface of the image carrier 10 to supply the impregnated ink to the latent image for development. The developing means 18, the thermal head 14 as the above-mentioned image writing means, and the replenishing means (not shown) forming the recording auxiliary agent contacting means together with the thermal head 14 constitute "image forming means".

The visible image formed as an ink image on the image carrier 10 as described above can be brought to the display position A by the rotation of the image carrier 10 for "image display". After the image is displayed, the image carrier 10 is further rotated, the visible image is removed by the cleaning unit 20, and then the latent image is erased by the latent image erasing unit 22. As the latent image erasing means 22, for example, an infrared irradiation device or a heating roller can be used. When an infrared irradiation device is used, it is sufficient to irradiate the surface of the image carrier with infrared rays uniformly. When a heating roller is used, 1
The roller surface kept at a temperature of about 00 to 150 ° C. may be brought into contact with the image carrier. The latent image erasing means may be provided on the surface side of the image carrier. A specific example of the cleaning means will be described later. In FIG. 1, reference numeral 30 indicates a casing.

FIG. 2 shows another embodiment. In order to avoid complication, the same reference numerals as those in FIG. 1 are used for those which are not considered to be confused. An image carrier denoted by reference numeral 11 has an endless belt shape and one end thereof is a take-up roller 1
3A, the other end is wound up by a winding roller 13B, and is stretched in a plane between the rollers 13C and 13D. The display position A is between the rollers 13C and 13D. The take-up rollers 12A and 12B form a pair of take-up units. The motor M selectively drives the take-up rollers 13A and 13B to rotate in a predetermined direction.
Therefore, the take-up rollers 13A and 13B and the roller 1
The 3C and 13D and the motor M constitute "carrier driving means". The moving direction of the image carrier is the winding roller 1
The direction from 3B to 13A is the positive direction, and when moving in the positive direction, image formation and image display are performed.

The thermal head as "image writing means" shown by reference numeral 14A has minute heating elements arranged linearly in a direction orthogonal to the drawing, and the heating element row is applied to the back side of the image carrier 11. I am in contact. The roller 15 which is provided so as to face the thermal head 14A via the image carrier 11 and serves as a “recording aid contact means” holds the solid recording aid 15A on the peripheral surface thereof and holds the image carrier 11 in place. It comes into contact with the surface of the image carrier 11 and follows the displacement of the image carrier 11. While moving the image carrier 11 in the forward direction, an image signal is input to the thermal head 14A to form a latent image, and the latent image is developed by a sponge roller 18 impregnated with ink. Is obtained, which can be displayed at the display position A.

It will be easily understood that the thermal head 14A, the roller 15 and the sponge roller 18 constitute "image forming means". After the display, the image carrier 11 is further transported in the forward direction, the visible image is removed by the cleaning device 20, the latent image is erased by the latent image erasing means 22, and the image is carried on the winding roller 13A. After the image carrier 11 is completely wound around the take-up roller 13A, the take-up roller 13B is driven to drive the image carrier 11
Is run in the opposite direction, rewound on the take-up roller 13B, and used again for image display.

FIG. 3 shows only six modified examples and only the characteristic parts are schematically shown. Here again, in order to avoid complication, the same reference numerals as those in FIG. 1 are used for those which are not considered to be confused.

In the modified example shown in FIG. 3A, the writing section by the thermal head 14 as the image writing means is
A feature of the present invention is that latent ink is formed and developed at the same time (in the case of claim 3) by holding 16A of the ink in which a coloring material is added to the recording aid by surface tension. The thermal head 14 and an ink replenishing means (not shown) form an ink contacting means.

In the modified embodiment shown in FIG. 3B, a transparent plate 14B is provided close to the surface of the image carrier, and a liquid recording auxiliary agent or ink is provided in the gap between the transparent plate and the image carrier 10. 16B is retained. Image writing is performed by an optical scanning device (not shown) as image writing means.
Optical scanning with the laser beam LB or the like is performed through the transparent plate 14B and the recording auxiliary agent or the ink 16B.
Of course, when a recording aid is used, development is carried out by a suitable developing means after the latent image is formed.

Since one dot in image writing is independent from each other, the visible image formed on the image carrier 10 is a set of dots when viewed in detail. In some cases, the independence of dots is conspicuous in the visible image and the continuity of the image is impaired. In such a case, as in the modified embodiment shown in FIG. 3C, the rolling means 19 is brought into pressure contact with the ink image formed as a visible image on the image carrier 10 to form the ink image on the surface of the image carrier. By rolling the sheet into a sheet, the continuity of the visible image can be improved. In this example, the rolling means 19 is an elastic roller, and the image carrier 1
Although it is pressed against 0 and driven, a belt-shaped rolling means may be used instead of the roller. Of course, it is desirable that the surface of the rolling means is formed of a material having a property of "repelling" the ink (fluorine-based polymer, silicone-based polymer, etc.).

If the fluidity of the ink is large,
When the image carrier 10 is made substantially vertical at the display position, ink may flow downward on the surface of the image carrier due to the action of gravity, so-called "ink dripping" may occur. In such a case, as in the modified embodiment shown in FIG.
It is preferable that the heater 21 is provided as a drying unit between the image forming unit and the display position to heat and dry the ink image. The drying of the ink image by the drying means may be performed from the surface side of the image carrier. The drying means is shown in FIG.
Can be used in combination with the rolling means shown in (1). In that case, a drying means is provided between the rolling means and the display position to dry the rolled ink image. Drying temperature is 40-8
The range of 0 degree C is good.

The modified embodiment shown in FIG. 3 (E) is an example effective when the image carrier 10 is light-transmissive, and an illumination means 25 is provided on the back side of the image carrier 10 to display the display position. The back side of the image carrier is illuminated. By doing so, image display can be effectively realized even in a dark place. A halogen lamp, a fluorescent lamp, or the like is suitable as the lighting unit 25.

The thermal head 14 described with reference to FIGS.
In 14A, the array length of the heat generating elements is substantially equal to the width direction of the image carrier, and an image of one line can be written at a time. Such a thermal head is effective when the image display device is relatively small, such as a desktop type or a laptop type. When the width of the image carrier is as large as the screen, it is preferable to write an image using the scanning type thermal head 14C as in the modified embodiment shown in FIG. As is known in connection with a thermal transfer printer, the scanning type thermal head 14C is composed of a plurality of heating heads arranged in the vertical direction of the drawing, and a plurality of heating heads are arranged for each scanning while moving in a direction orthogonal to the drawing. The image of the line is written.

Although the six modified examples have been described above, the modified examples can be used in combination with each other as long as they do not contradict each other, and can be appropriately modified and applied to the embodiments of FIGS.

FIG. 4 shows two specific examples of the cleaning means. In general, at the time when cleaning is performed by the cleaning unit, the ink that forms the visible image is dry and solid. In the example shown in FIG. 4 (A), the cleaning means has a configuration in which the adhesive belt 20A whose both ends are wound around the winding rollers 20B and 20C is used. The adhesive belt 20A is wound around the winding roller 20B by driving a motor (not shown) while being pressed against the peripheral surface of the image carrier 10 by the pressing roller 20D. In order to ensure the contact between the adhesive belt 20A and the surface of the image carrier, a facing plate 20E is provided facing the pressure roller 20D. The visible image is peeled off from the surface of the image carrier 10 by the adhesive force of the adhesive belt 20A.

In the example shown in FIG. 4B, the cleaning means is a sponge roller 20a impregnated with a solvent liquid,
The blotter roller 20b is made of a material having a good hygroscopic property such as blotter paper. The sponge roller 20a is
The solvent liquid is applied to the visible image to melt the ink while the image carrier is in contact with the surface of the image carrier and is moved by the movement of the image carrier 10, and the liquid ink is wiped from the surface of the image carrier by the blotter roller 20b. In order to enhance the wiping effect, the blotter roller 20b is forcibly rotated in a direction counter to the moving direction of the image carrier surface by a driving unit (not shown).

FIG. 5 shows an embodiment of the invention of claim 11. The image carrier 10, which is light-transmissive and has an endless belt shape, is wound around rollers 12, 12A, and 12B, and is driven to rotate counterclockwise. The image formation is performed by the method described with reference to FIG. 3A (a method in which the recording auxiliary agent 16A also serving as ink is brought into contact with the image writing portion by the thermal head 140 to perform latent image formation and development simultaneously). The formed visible image is rolled by the rolling means 190, dried by the drying means 21, and then brought to the display position.

The visible image is stopped at the display position and illumination is performed by the illumination means 25. Then, the visible image placed at the display position is projected and displayed on the screen S by the imaging lens 40. After the image is displayed, the image carrier 10 is displaced counterclockwise, the visible image is removed by the cleaning unit 20, and the latent image is erased by the latent image erasing unit 22. Code 3
Reference numeral 1 indicates a casing.

Image display of a color image will be described below with reference to FIGS. Here again, in order to avoid complication, the same reference numerals as those in each of the drawings from FIG.

The feature of the embodiment shown in FIG. 6 lies in the image forming means. That is, the image forming means includes three thermal heads 14.
1, 142, 143 and inks 16Y, 16M, 16C held also in the vicinity of the thermal head and the image carrier 10 and also serving as recording aids, and paired with these, drying means 211, 212, 213. Have been deployed.

In displaying a color image,
While rotating the image carrier 10 in the counterclockwise direction, first the image is written by the thermal head 141, and the development with the ink 16Y is performed at the same time when the latent image is formed. The image written by the thermal head 141 is a yellow image component forming a color image, and the ink 16Y is a recording auxiliary agent to which a yellow colorant is added. The yellow visible image is immediately dried by the drying means 211.

Subsequently, the magenta image component is written by the thermal head 142 in synchronization with the position of the visible yellow image, and the latent image is visualized by the ink 16M containing the magenta coloring material. The magenta visible image is immediately dried by the drying means 212. Similarly, when a cyan image component is written by the thermal head 143 and developed with the ink 16C containing a cyan colorant, a color visible image is formed on the surface of the image carrier 10. This visible image is also immediately dried by the drying means 2.
Dried by 13. Subsequently, the visible color image is rolled by the rolling means 19 and brought to the display position for image display. Reference numeral 32 indicates a casing. After the image is displayed, the cleaning means 20 removes the visible image and the latent image erasing means 22 erases the latent image.

The embodiment shown in FIG. 7 has a single thermal head 141 as an image writing means, and three developing means 18Y, 18M and 18C are provided between the thermal head 141 and the rolling means 19. ing. Each of the developing means 18Y, 18M, and 18C is a sponge roller, and is impregnated with yellow, magenta, and cyan color inks, respectively, and is usually separated from the surface of the image carrier 10, but each is selectively. The surface of the image bearing member is brought into contact with the surface of the image bearing member for development.

To display an image, while the image carrier 10 is rotated counterclockwise, an image of a yellow image component is first written by the thermal head 141, and the formed latent image is developed by the developing means 18Y with yellow ink. Visualize. At this time, the developing units 18M and 18C are retracted from the surface of the image carrier and are not operated. Rolling by the rolling means 19 by further rotating the image carrier 10,
Drying by the drying means 21 is performed. The cleaning unit 20 stops its operation, the image carrier 10 is further rotated, and the latent image erasing unit 22 erases the latent image.

When the yellow visible image formed as described above returns to the position of the thermal head 141, the magenta image component is written by the thermal head 141 in synchronization with the yellow visible image. The latent image formed by this writing is the developing means 18M.
To develop with magenta ink. At this time, the developing means 1
6Y and 16 are retracted from the surface of the image carrier to stop the operation. The obtained magenta visible image is rolled and dried, and the thermal head 141 is processed in the same manner as above.
The cyan image component is written by the developing means 1
Only 8C is brought into contact with the surface of the image carrier to visualize the latent image with cyan ink.

The color image thus obtained is subjected to rolling and drying, and the image is displayed at the display position. After the image is displayed, the visible image is removed and the latent image is erased.

In the color image display of the two examples described above, a black image component may be further added to each of the yellow, magenta and cyan image components. In such a color image display, when the latent image of the magenta image component is visualized, the yellow visible image already exists on the image carrier, and when the latent image of the cyan image component is visualized, the yellow and magenta images are visualized. Each visible image is present. Therefore, when visualizing the latent images of the magenta and cyan image components, it is necessary to prevent the previously formed ink image from being affected by the subsequent development. To do this, each color ink (including the ink that also serves as a recording aid) is
The other ink may be made to “repell”. To realize this, fine particles of resin may be dispersed in each color ink. In the case of water-based ink, the resin to be dispersed is preferably an emulsion or dispersion of ethylene / vinyl acetate copolymer, acrylic resin, styrene / vinyl acetate copolymer, or the like. The appropriate amount of resin dispersed is 5 to 20% in terms of content.

Finally, a specific example will be given. In the example of the apparatus shown in FIG.
An apparatus provided with the rolling means 19 of (C) and the drying means 21 of FIG. The image carrier 10 has a width of 300 m
The polyimide film of m is used as a base, and the surface of the polyimide film shown in FIG.
Freon 1 is a fluorine-containing acrylate material having the structural formula shown in
The liquid diluted with 13 was spin-coated, dried at a temperature of 130 ° C. for 1 hour to form a surface layer, and the whole was made into an endless belt and wound around rollers 12A and 12B.

As the thermal head 14, a heating element having a density of 300 dpi and arranged over a length of 216 mm was used, and as the recording aid 16, pure water was used. The sponge roller, which is the developing unit 18, uses pure water as a solvent and dye: BK-207 as a coloring agent.
wt%, ethylene / vinyl acetate copolymer as resin: 1
A water-based ink having 0 wt% dispersed therein was impregnated. A ceramic heater was used for both the drying means and the latent image erasing means, and an elastic silicone roller was used for the rolling means. As the cleaning means 20, the adhesive belt (Scotch tape) type shown in FIG. 4A was used.

It was possible to obtain a display image in the order of image writing, development, rolling, and drying and bring it to the display position to realize an extremely good image display. The visible image was removed and the latent image was erased well, and a good image could be repeatedly displayed.

[0049]

As described above, according to the present invention, a novel image display device can be provided. Since this image display device is configured as described above, it is possible to display a good image with a simple device.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment.

FIG. 3 is a diagram showing only a characteristic part of a sixth modification.

FIG. 4 is a diagram showing two specific examples of cleaning means.

FIG. 5 is a diagram showing an embodiment of the image display device of claim 11;

FIG. 6 is a diagram showing an embodiment in which the present invention is applied to color image display.

FIG. 7 is a diagram showing another embodiment in which the present invention is applied to color image display.

FIG. 8 is a diagram showing a structural formula of an example of an image forming material.

[Explanation of symbols]

 10 image carrier 12A, 12B roller 14 thermal head 18 developing means A display position

Claims (11)

[Claims] 1. A solid which becomes a liquid or a vapor when heated,
Alternatively, the receding contact angle is decreased by being heated in contact with a recording aid which is liquid or vapor, and the receding contact angle is increased by heating in the absence of the recording aid. And an image carrier formed on a belt-shaped substrate as a carrier, a carrier driving unit for displacing a part of the image carrier in a desired direction while flattening it at a display position, and an image according to an image signal. An image forming unit for forming a latent image according to an image signal by position-selectively reducing the receding contact angle of the surface of the carrier, and visualizing the latent image with ink, and a visible image formed with the ink on the surface of the image carrier. And a latent image erasing means for erasing the latent image by uniformly heating the surface of the image carrier in the absence of a recording aid. An image display device comprising: 2. The image display device according to claim 1, wherein the image forming means position-selectively heats the image carrier from the front surface side or the back surface side in accordance with an image signal, and the image writing means. In the image writing unit, the recording auxiliary agent contact means for contacting the recording auxiliary agent with the surface side of the image carrier, and the latent image is visualized by supplying ink to the surface of the image carrier on which the latent image is written and formed by the image writing means. An image display device comprising: 3. The image display device according to claim 1, wherein the image forming means comprises an image writing means for position-selectively heating the image carrier from the front surface side or the back surface side in accordance with an image signal, and a recording auxiliary agent. An image display device, comprising: an ink contact unit that brings ink containing a colorant into contact with the surface side of the image carrier in the image writing unit of the image writing unit. 4. The image display device according to claim 2, wherein the developing means is a color developing means for selectively supplying three color inks forming a color image onto the surface of the image carrier. Display device. 5. The image display device according to claim 3, wherein the image forming means includes three image writing means to which three types of color image signals for color images are separately input, and these three image writing means. An image display device, wherein each image writing unit has three ink supply means for supplying ink of a color corresponding to a color image signal. 6. The image display device according to claim 1, 2 or 3 or 4 or 5, wherein the image carrier is in the form of an end belt and is capable of traveling in a forward and reverse direction between a pair of winding portions. An image display device characterized by being present. 7. The image display device according to claim 1, 2 or 3 or 4 or 5, wherein the image carrier is in the form of an endless belt and is capable of circulatingly traveling in a predetermined direction. Image display device. 8. The image display device according to claim 1, 2 or 3 or 4 or 5 or 6 or 7, wherein an ink image forming a visible image is formed on the surface of the image carrier between the image forming means and the display position. An image display device comprising rolling means for rolling. 9. The image display device according to claim 1, 2 or 3 or 4 or 5 or 6 or 7 or 8, which may be provided between the image forming means and the display portion or between the rolling means and the display portion. An image display device comprising a drying means for drying an ink image forming a visible image. 10. The image display device according to claim 1, 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, wherein the belt-shaped substrate is light-transmissive, and a display is made from the back side of the image carrier. An image display device comprising an illuminating means for illuminating a position. 11. The image display device according to claim 10, further comprising an image forming lens for forming an image of a display section displayed by the illumination means on a screen.