JPH07239597A - Picture display method - Google Patents

Abstract

PURPOSE:To provide a picture display method capable of displaying the data of a computer or a facsimile in color and vividly even in a dark place on a large screen at low cost. CONSTITUTION:A color picture is displayed by using a plate-like light transmissive picture carrier 10 having a light non-transmissive part and the regular repetitive pattern of plural colors with light transmitting property, selectively sticking light non-transmissive printing material (toner 41) corresponding to the arranged size of the repetitive pattern in accordance with picture data, and radiating light by a backlight (fluorescent lamp 23). By removing the light non-transmissive printing material stuck to the picture carrier 10 from the picture carrier 10, the light transmissive picture carrier and the light non- transmissive printing material can be reused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display method,
In particular, the present invention relates to an image display method for displaying color image information converted into an electrical signal as a visible image that can be visually recognized.

[0002]

2. Description of the Related Art Conventionally, as an image display device for displaying data of, for example, a computer, a facsimile, a scanner, a CRT, a liquid crystal display device, a plasma display device, an LED.
2. Description of the Related Art There is known a device such as a display device which has no moving parts and operates only by electric means.

Further, a belt-shaped photoconductor or a dielectric is used as an image carrier, and a printing material such as toner is selectively adhered to the surface of the photoconductor or the dielectric according to the above data, and in some cases, weak fixing is performed. An image display device for displaying in this way has been proposed and partially put into practical use.

Further, an image display device has been proposed in which a pixel constituent member including a printing material having magnetic characteristics is used, and the printing material is displayed by selectively reversing or moving the printing material according to the previous data.

However, an apparatus that operates only by electrical means without mechanically moving parts becomes expensive for applications such as large-screen image display or temporary still image display.
It took a lot of time and labor for maintenance, and it took time to install it.

Further, in an image display device using a belt-shaped photoconductor or a dielectric or an image display device using a pixel constituent member including a stamp having magnetic characteristics, a relatively large screen image or a still image is not displayed. Although it is easy, there is a problem that color display is not possible or the display surface is dark.

[0007] In addition, the use of a photoconductor has technical problems such as light resistance at the time of display and characteristic deterioration accompanying it, manufacturing cost at the time of large screen, and uniformity of characteristics.

On the other hand, as a color image display method, fine stripe-shaped or mosaic-shaped color patterns of red, green, blue, etc. are provided on an image carrier on which an image is formed, and these color patterns are set. A method for displaying a color image by appropriately hiding with toner is disclosed in Japanese Patent Laid-Open No. 59-2295.
No. 78 is disclosed.

[0009]

However, in the method disclosed in the above-mentioned Japanese Patent Laid-Open No. 229578/1984,
Since the fixed needle electrodes are opposed to each color pattern to which a voltage is applied on the image carrier and the image carrier is accurately transferred to form an electrostatic image, and toner is attached. In addition, highly precise alignment of each color pattern on the image carrier with the fixed needle electrode is required.

Also, in the production of each color pattern on the image carrier, it is difficult and expensive to align the electrodes with the color pattern or to pass each color from the common electrode to each pattern when there are three or more colors. Met. 1. An improved technique has been published that has been proposed in order to solve such a problem. For example, the technique disclosed in Japanese Patent Laid-Open No. 61-290479 is one of them, which is different from the technique disclosed in Japanese Patent Laid-Open No. 229578/1984 in that it is not a fixed needle electrode but an optical sensor. A conductive layer is placed on an image carrier to electrostatically form by light.
It is intended to display a color image by using two or more kinds of light sources corresponding to the narrow band light transmission filters of one kind or more.

However, the above-mentioned JP-A-61-2904 is used.
As can be seen from the description of Japanese Patent Publication No. 79, the process is very complicated and expensive members are used, which cannot be put to practical use.

In addition to this, there is a proposal, and there is also a technique for forming a color image by selectively adhering toner to a dielectric image carrier having a stripe-shaped pattern of each color having no electrodes in accordance with the pattern. is there.

However, this also requires high accuracy of toner adhesion for each color pattern as in the case of the above problem, and therefore, especially when a belt-shaped image carrier is used, the feeding accuracy is maintained. With difficulty. Further, since the toner adheres to the surface having the color pattern, the durability in terms of color reproducibility remains a question.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore an object of the present invention is to provide a novel image display method capable of solving the above-mentioned problems inherent in the prior art. To do.

[0015]

In order to achieve the above object, an image display method according to the present invention provides a surface with a regular repeating pattern of at least two light-transmitting colors having a non-light-transmitting portion. Using the translucent image carrier formed in
A non-translucent printing material is selectively adhered to the surface of the translucent image bearing material corresponding to the repeating pattern, and the translucent image bearing material to which the non-transmissive printing material is adhered is illuminated by a backlight. Thus, a color image is displayed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be specifically described with reference to the drawings for each of its preferred embodiments.

1 and 2 are partial plan views showing the structure of a translucent image carrier used in the present invention and 2-2 'in FIG.
FIG. 3 is a cross-sectional view taken along the line and seen in the direction of the arrow, and shows the pattern formed on the surface of the glass substrate 11 serving as the base material of the translucent image carrier 10 in FIGS. 1 and 2. The light-transmissive fine red R, green G, and blue B are regularly and repeatedly arranged, and a black non-light-transmitting portion (black matrix) 12 is formed between these respective colors. . The regular repeat shown here is a mosaic pattern arrangement.

FIG. 2 is a view showing the cross-sectional structure of the translucent image carrier.

Referring to FIG. 2, thin layers of red R, green G, and blue B are regularly and repeatedly arranged on a glass substrate 11 which is a base material of a light-transmitting image carrier, and between the respective colors. The black matrix 12 is interposed between the two. An overcoat layer 13 is formed on the thin layer of each color and the black matrix 12. Furthermore, the glass substrate 1
A dielectric layer 14 as an electrostatic recording layer is formed on the surface opposite to the surface on which the repeating pattern is formed.

There are various methods for producing a repeated color pattern on the glass substrate 11, and there are roughly classified an organic filter using an organic material as a coloring layer, an inorganic filter using an inorganic material, and a combination filter using a combination thereof. It is known how to do it.

As a manufacturing method using an organic filter, there are a dyeing method, a dispersion method, a printing method, an electrodeposition method and the like, and for an inorganic filter, a multilayer interference film method is known.

The size of each color of red R, green G, and blue B is, for example, 80 to 200 μm, and in FIG.
An example of μm × 150 μm is shown. The distance between each color is about 30 to 50 μm.

As the dielectric layer 14, a translucent resin layer made of PET (polyethylene terephthalate), polyethylene, polystyrene, polyester or the like having a thickness of 20 to 30 μm is used.

Next, an image display method using the translucent image carrier thus constructed will be described.

[0025]

Embodiment 1 FIGS. 3 (a), 3 (b) and 4 are schematic views for explaining a first embodiment of the image display method according to the present invention.

Referring to FIGS. 3 (a), 3 (b) and 4,
For the dielectric layer 14 of the translucent image carrier 10, the dielectric layer 1
4, which is opposite to the surface having 4, i.e., the charge 40 is selectively applied according to the image data in accordance with the position and size of each color pattern provided on the surface, and the charge 40 is not applied to the surface of the dielectric layer 14. Black toner 41 which is a translucent printing material
Attach.

Here, as an example of a method for selectively applying charges to the dielectric layer 14, an example using the contact type electrostatic head 15 is shown (FIG. 3A). The black toner 41 is a toner mainly used in polyester, polystyrene, and styrene-acrylic copolymer having a thickness of about 7 to 12 μm, which is used in a usual electrophotographic process.

In FIG. 3B, the toner 41 is attached to a position other than the pattern position of the green color G on the opposite surface.
41 toner adhesion to the charge imparted to the 2 dielectric layer surface is
The toner 41 is charged with a polarity opposite to the polarity of the charge applied to the surface of the dielectric layer, and the surface potential due to the applied charge and the bias applied to the toner carrier 18 (bias power supply 22 in FIG. 3).
By forming the electric field by the toner 41, the toner 41 adheres only to the surface position of the dielectric layer to which the electric charge is given according to the image data.

The light-transmitting image carrier 10 to which the toner 41 has been attached in this manner is then illuminated by a backlight from the side having the respective color patterns on the surface. There are various types of backlights, including incandescent lamps, LEDs, ELs, fluorescent lamps, flat fluorescent lamps, and the like.

FIG. 4 shows an example using the cold cathode type lamp 23 in the fluorescent lamp.

Here, a structure is shown in which light sources are arranged at both ends of the transparent image carrier 10 and a transparent acrylic plate is used as the light guide 24. The periphery of the light guide 24 and the fluorescent lamp 23 as a light source are covered with a reflection plate 25 so that light does not leak. In order to illuminate more effectively and uniformly, the light guide 2
It is also an effective method to carry out a diffusion process on No. 4 or to provide a Fresnel prism, a multilayer thin plate or the like.

The reason why the hack light is irradiated from the side of the surface of the translucent image carrier 10 having each color pattern is to make the backlight surface and the color pattern surface closer to each other, as can be seen from FIG. When the light passing through the color pattern part is viewed from the side opposite to the backlight, the light passing through the color pattern part corresponding to the part shielded by the toner is made as invisible as possible to enable clear color reproduction. Because you can.

In this way, in the translucent image bearing member 10 illuminated by the backlight, only the light that has passed through the green pattern is seen when viewed from the side opposite to the backlight, whereby The green color will be displayed.

After the display is completed, the toner 41 adhered on the dielectric layer 14 of the translucent image carrier 10 is removed by an elastic blade 36 made of urethane or the like as shown in FIG.

Further, the charge removing section 37 removes the residual charges on the dielectric layer 14. As a result, the transparent image carrier 1
0 is ready for use again.

The removal step as shown in FIG. 5 does not have to be performed immediately after the image display, but may be performed immediately before starting the next step for displaying another image.

This is because, in the present image display method, even if the toner is adhered onto the light-transmissive image carrier for a long period of time or is left to stand, no particular problem occurs in the process.

[0038]

Second Embodiment Next, a second embodiment according to the present invention will be described.

FIG. 6 is a schematic cross-sectional view showing the cross-sectional structure of a translucent image carrier used in the second embodiment of the present invention.

Referring to FIG. 6, a dielectric layer 14 such as PET.
The red, green, and blue patterns are superposed on the surface of the weather-resistant translucent image carrier 10 as shown in the figure to form a regular repeating pattern and a non-translucent black matrix of three-color superposed portions. A part 12 'is formed. Again, the overcoat layer 13 is provided on each color pattern. In this case, as the color pattern manufacturing method, various methods are known as in the first embodiment, but the printing method is suitable because the resin film is used as the light-transmitting image carrier base material.

Since the resin-made transparent image bearing member substrate is used, the substrate itself can be used as an electrostatic recording layer.

The arrangement of each color pattern is a triangle type as shown in FIG. This is the first
In the mosaic type shown in the example of, the black matrix portion becomes vertical lines, and the lines are conspicuous when the image is viewed, whereas the triangle type is a pattern in which vertical black lines are not connected. is there.

The translucent image carrier 10 having such a structure is fixed in a plate shape by a peripheral frame, and as shown in FIG. Are brought close to each other, and charges 40 are selectively applied to the surface according to the arrangement and size of the color pattern according to the image data.

Here, the charges 40 are applied to positions other than the red pattern position.

Next, by using a colored toner which is a non-translucent printing material charged to the same polarity as the electric charge 40 selectively applied to the surface of the transparent image carrier 10, basically no charge is applied. Adhere colored toner to the surface. FIG. 9 shows the situation.

In this case as well, by forming an electric field between the toner carrier 18 and the light-transmitting image carrier 10 as in the first embodiment, faithful and clear transfer and adhesion of the toner corresponding to the image data can be achieved. Is realized.

Here, as the color toner, a gray toner having no translucency is used. This is because it is possible to make the toner less conspicuous at the time of display when the toner is fused and infiltrated into the portion against scratches and deterioration due to repeated use of the resin image carrier.

Now, as shown in FIG. 10, the light-transmitting image carrier 10 to which the toner is selectively adhered is irradiated with EL from the surface opposite to the toner adhering surface side by EL, as shown in FIG. Will be displayed. EL
Is to emit a light by applying a high electric field to the dielectric layer in which the powder phosphor is dispersed.

This is because since the toner adheres only to the portion corresponding to the red pattern position, the backlight light passes through the green and blue patterns, respectively, and the mixture of the two colors results in a cyan color. is there.

In this case, the EL as the backlight is also irradiated from the surface opposite to the surface on which the toner is adhered for the same reason as described in the first embodiment.

After the display or before the next different image forming process, the toner 41 adhered on the transparent image carrier is removed from the image carrier 10 by a cleaning elastic blade 36 or a brush as shown in FIG. To be removed.

Furthermore, the charge is removed from the surface of the translucent image carrier 10 on which the toner is attached.

Further, in the cleaning performed before the next different image forming step, not only the removal of the attached toner and the removal of the toner on the toner-attached surface, but also the cleaning or the removal of the backlight irradiation surface side is performed. It is effective for the next clear image formation and display.

Although the first and second embodiments have been described above, the translucent image carrier 1 used in the present invention.
The arrangement of the respective colors of the regular repeating color pattern of 0 is not limited to these, and the arrangement shown in the stripe type of FIG. 11 or the four pixel arrangement type of FIG. It is not limited to.

[0055]

Third Embodiment Next, a third embodiment according to the present invention will be described.

As the light-transmitting image carrier used in the third embodiment, the same one as used in the first embodiment is used.

Next, a developing device as shown in FIG. 13 is used to attach the toner 41 to the translucent image carrier 10 according to the image data corresponding to the arrangement and size of each color pattern.

This is not the process of selectively applying charges to the surface of the transparent image carrier and attaching the charged toner corresponding to the charge state as shown in the first or second embodiment, but the developing device. A selective toner state is formed on the toner carrier 18 of the image carrier 10 and the toner 41 on the toner carrier 18 is batched at a position facing the image carrier 10.
It is to shift to the side.

The selective toner layer is formed on the developing toner carrier 18 by changing the voltage applied to the developing blade 32 to change the electric field between the developing blade 32 and the toner carrier 18 and passing between them. The toner is formed by changing the charge amount and the supply amount of the toner.

Therefore, the moving relationship between the translucent image carrier 10 and the toner carrier 18 is one-to-one. In addition to the method of controlling the developing blade voltage shown here, a large number of fine width electrodes are provided on a fixed sleeve with a built-in rotating mag roll, and a selective toner layer is provided by controlling the power supply applied to each electrode. There are methods such as being transported.

The light-transmitting image carrier 10 to which the toner is attached in this manner is illuminated by a backlight using a fluorescent lamp as in the first embodiment, and an image is displayed. Then, after the display or before the next different image formation, the toner 41 is removed from the surface of the translucent image carrier 10.

In any of the above embodiments, the toner removed by the removal of the adhered toner after the display or before the next different image formation can be used again as the non-translucent printing material for adhesion.

As the backlight, an example of a fluorescent lamp or EL has been shown, but the invention is not limited to this, and an incandescent lamp, an LED or the like may be used as described above.

In each embodiment, the color pattern is three colors of red, green and blue, but this may be any other desired color, or any two colors. Four
A multicolor pattern of 5 colors or the like may be used.

However, there is an advantage that a full color image can be expressed by using the above three colors.

Although black toner and gray toner are shown as examples of the non-translucent printing material, toners of other colors may be used in the case of patterns of other colors.

Furthermore, although the toner is shown as the non-translucent printing material, this is not only the powder toner but also the liquid toner,
Highly viscous toner may be used.

The toner carrying method is not limited to the one-component developing method and may be the two-component developing method. Further, the toner may be conductive, insulating, magnetic, non-magnetic, or any combination.

[0069]

As described above, according to the present invention, the following various effects can be obtained.

1. Since the non-translucent portion, that is, the so-called black matrix portion, is provided in the regular repeating color pattern, it is not necessary to improve the precision of the position of the non-translucent printing material to be attached. It is possible to reduce the transfer accuracy.

2. Also in the production of the regular repeating color pattern on the light-transmitting image carrier substrate, the positional accuracy of each color pattern can be reduced by having the non-light-transmitting portion.

3. It is not necessary to provide an electrode in the color pattern, and not only the cost can be reduced, but also a large screen, maintenance, and replacement are easy.

It is possible to easily realize a full-color image display only by a simple process of simply selectively attaching a non-translucent printing material of 4.1 color and a simple backlight irradiation.

5. Although the overcoat layer is provided on the surface having the color pattern, its planarity also has a problem in mechanical durability, but there is a problem with the adhesion of toner on that surface.
By performing the removal process on the opposite surface without removing it, the durability and color reproducibility of the image bearing member are excellent.

6. Since the side of the surface having the non-translucent portion and having the color pattern is illuminated by the backlight, faithful color reproduction is realized.

7. By removing the adhering toner after the display or before the next different image formation, the transparent image carrier and the toner can be used any number of times, and the running cost can be greatly reduced.

8. The color pattern having a non-translucent portion has excellent color reproduction and sharpness in image quality as compared with a color pattern having no non-translucent portion. As for concern about insufficient brightness during image display, it is sufficient to deal with increased brightness within about 5% of the light source of the backlight, and there is no problem.

9. By using a plate-shaped translucent image bearing member, it is very difficult to maintain the feeding accuracy of the belt-shaped image bearing member that has been proposed and put into practical use, and it is difficult to realize highly accurate feeding. Support shaft by rotation,
Contact with the drive shaft, dirt due to rubbing, easy occurrence of scratches and a large decrease in translucency accompanying it, replacement is time consuming, manufacturing cost is high, device tends to be large,
It is easy to realize high quality image formation and stable image formation.

10. The plate-shaped image carrier makes it easier to match the toner adhesion position and size with the color pattern, and when combined with the accuracy reduction due to the presence of the non-translucent part, image display using a higher density color pattern is realized. it can.

11. A small screen to a large screen can be easily realized.Because a backlight is used, day and night, outdoors,
Can be used everywhere indoors.

Once the toner is attached, the image can be displayed for a long period of time without performing the image forming process again and without performing the subsequent device maintenance management.

As described above, the image display method according to the present invention, which has many advantages, is extremely effective and characteristic.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a translucent image carrier (mosaic type) used in a first embodiment according to the present invention.

2 is a cross-sectional view of the translucent image bearing member taken along line 2-2 'of FIG. 1 and viewed in the direction of the arrow.

3A and 3B are views for explaining a first embodiment according to the present invention, in which FIG. 3A shows an electrostatic head as a dielectric layer of a translucent image carrier. FIG. 7B is an explanatory diagram showing a step of applying electric charges, and FIG. 6B is a sectional view of the developing device for explaining a step of attaching toner to the electric charges applied to the surface of the dielectric layer.

FIG. 4 is a diagram for explaining the first embodiment according to the present invention, which is a cross-sectional view of a step of irradiating a light-transmitting image carrier with a backlight.

FIG. 5 is a cross-sectional view for explaining a process of removing the toner attached on the dielectric layer after the end of display in the first embodiment of the present invention.

FIG. 6 is a sectional view showing a translucent image carrier used in a second embodiment of the present invention.

FIG. 7 is a plan view of a translucent image carrier (triangle type) used in the second embodiment of the present invention.

FIG. 8 is a cross-sectional view for explaining a process of forming an electrostatic latent image in the second embodiment according to the present invention.

FIG. 9 is a cross-sectional view for explaining a step of adhering a color toner to the surface to which no electric charge is applied in the second embodiment of the present invention.

FIG. 10 is a cross-sectional view for explaining a step of displaying a cyan image by irradiating a light-transmissive image carrier with EL as a backlight in the second embodiment according to the present invention.

FIG. 11 is a plan view showing another example (striped type) of the translucent image bearing member.

FIG. 12 is a plan view showing still another embodiment (pixel arrangement type) of the translucent image carrier.

FIG. 13 is a sectional view for explaining a third embodiment according to the present invention.

[Explanation of symbols]

 10 ... Translucent image carrier 11 ... Glass substrate 12, 12 '... Black matrix 13 ... Overcoat layer 14 ... Dielectric layer (PET) 15 ... Electrostatic head 16 ... Electrostatic head controller 17 ... Image data 18 ... Toner transport Body 19 ... Brush 21 ... Cleaner 22 ... Bias power supply 23 ... Fluorescent lamp (cold cathode type) 24 ... Light guide 25 ... Reflector 27 ... Electrostatic head 28 ... Corona power supply 29 ... Shield power supply 30 ... Control power supply 31 ... Image Data 32 ... Development blade 33 ... Development blade voltage controller 34 ... Image data 35 ... Toner carrier power supply 36 ... Cleaning elastic blade 40 ... Electric charge 41 ... Toner

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 21/10 21/08 G09F 9/00 7610-5G G03G 21/00 312 342

Claims (9)

[Claims] 1. A light-transmissive image carrier having a surface on which a regular repeating pattern of at least two light-transmitting colors having a non-light-transmitting portion is formed. A transparent image material is selectively attached to the surface of the transparent image carrier, and a color image is displayed by irradiating the transparent image carrier to which the non-transparent image material is attached with a backlight. An image display method characterized by the above. 2. The image display method according to claim 1, further comprising removing the non-translucent printing material attached to the surface of the translucent image carrier after the display. 3. The surface of the translucent image bearing member is further cleaned prior to selectively adhering the non-translucent stamp to the surface of the translucent image bearing member. The image display method according to item 1. 4. The backlight according to claim 1, further comprising a step of irradiating the translucent image bearing member with a backlight from a surface having the repeating pattern on a surface thereof. Image display method. 5. The non-translucent printing material is attached to the surface of the translucent image bearing member opposite to the surface having the repetitive pattern on its surface. 4. The image display method according to any one of 4 above. 6. The image display method according to claim 1, wherein the non-translucent portion of the repeating pattern of the translucent image carrier is a black matrix. 7. The image display according to claim 1, further comprising an electrostatic recording layer on a surface of the translucent image carrier on which the non-translucent printing material is attached. Method. 8. The image display method according to claim 1, wherein the translucent image carrier is plate-shaped. 9. The image display method according to claim 1, further comprising reusing the non-translucent printing material.