JP2003228086A - Reversible display advertisement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dry reversible display advertisement device whose structure is simple and whose cost is low and whose size can be easily made large and also whose power consumption is small and moreover which is excellent in visibility in the bright outdoors and the like and whose thinning is possible. <P>SOLUTION: This reversible display advertisement device is constituted by arranging a plurality of display elements 1 each of which is constituted by sealing two kinds of dry particles 6, 7 whose colors and static electric characteristics are different between a transparent substrate 3 and a counter substrate 4 and also by arranging two kinds of electrodes 8, 9 which apply static electric fields to these particles and whose polarities are different at the side of the counter substrate while making these display elements 1 to be lined up and by enabling prescribed polarities to be applied to respective electrodes 8, 9 of each display element 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible display advertisement device capable of repeatedly displaying, changing, and erasing characters, symbols, figures, images, etc. based on the flying movement of dry particles utilizing Coulomb force. The present invention provides a device suitable for use in rooftop advertisements, wall advertisements, in-train advertisements, various signboards, and the like.

[0002]

2. Description of the Related Art A neon sign is used as an advertising device installed or arranged on a rooftop, inside and outside walls of a building, or the like for the purpose of widely publicizing various kinds of information including advertisements. , Electronic display board, liquid crystal display board,
LED display boards and the like have been conventionally known.

[0003]

However, in such a conventional apparatus, there are problems that the apparatus structure is complicated, the equipment cost is high, it is difficult to increase the size, and the power consumption is large. there were.

Therefore, the present invention is simple in structure, low in cost, easy to increase in size, consumes less power, has excellent visibility in bright outdoors, and can be thinned like a wall-mounted type. It is an object of the present invention to provide a dry-type reversible display advertisement device having excellent responsiveness, which can continuously change the display like a moving image.

[0005]

A reversible display advertising device according to the present invention encloses two kinds of dry particles having different color and charging characteristics between a transparent substrate and a counter substrate which faces the transparent substrate. , A plurality of display elements, which are provided with two types of electrodes having different polarities, which apply an electrostatic field to the particles, are preferably arranged in close contact with each other, for example, aligned in a matrix in the vertical and horizontal directions. Thus, a desired polarity can be given to each electrode of each display element.

In such a device, the two kinds of electrodes of the display element can be disposed on the counter substrate side, and are also disposed separately on the transparent substrate side and the counter substrate side, and at the same time, transparent. The electrode on the substrate side may be a transparent electrode. Here, the color of the dry particles is preferably white or black.

Another reversible display advertisement device according to the present invention encloses two kinds of dry particles having different charging characteristics, preferably black particles, between two transparent substrates facing each other, and For example, a plurality of display elements each having two pairs of electrodes for applying an electrostatic field to particles and a color filter, and a backlight provided on the outer side of one of the transparent substrates positioned apart from the color filter are provided. , Align them vertically and horizontally under close contact with each other,
A desired polarity can be given to each electrode of each display element.

In each of these advertising devices, the average particle size of the dry particles is preferably 0.1 to 50 μm, and the surface charge density of the dry particles is 5 to 150 μC / m ^{2 in} absolute value. It is preferable.

Also, the dry particles have a surface of 1
When a voltage of 8 kV is applied to a corona discharger arranged with a space of mm to generate corona discharge and the surface is charged, the maximum surface potential after 0.3 seconds is a particle larger than 300 V. It is preferable.

By the way, in the latter device, of the two pairs of electrodes, one pair is a transparent electrode pair arranged in the central portion of the substrate, and the other pair is arranged in at least one of the peripheral portion of the substrate and the partition wall. The electrode pair is preferable.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional perspective view showing an embodiment of the present invention. In this reversible display advertising device shown here, a plurality of reflective display elements 1 are adhered to each other via their respective partition walls 2. In this way, they are arranged in a matrix in front, rear, left and right.

In this device, one display element 1 serves as one pixel in the case of monochrome display. When displaying an arbitrary color other than black and white, the combination of the colors of dry particles described later may be appropriately performed. In the case of full-color display, three types of display elements, that is, display elements having colored particles of R (red), G (green) and B (blue) and each having black particles are set as one set, and It is preferable that a plurality of sets are arranged to form a reversible display advertising device.

In this case, the two adjacent spaces 2 which are located in contact with each other may be a single partition common to the two adjacent display elements 1. In this case, it is preferable that the substrate described later be shared by the plurality of display elements 1.

In this drawing, each display element 1 is provided with a partition wall 2 between a transparent substrate 3 located on the upper side and a counter substrate 4 on the lower side of the transparent substrate 3 and extending in parallel facing the transparent substrate 3. While positioning at intervals,
The substrate 3 and 4 and the partition wall 2 define an airtight chamber 5 of atmospheric pressure or negative pressure, and in the airtight chamber,
Two kinds of dry particles 6 and 7 having different colors and different charging characteristics are enclosed, and two kinds of electrodes having different polarities, which are the display electrode 8 and the counter electrode 9, are provided on the counter substrate. The display electrodes 8 are preferably arranged in the central region of the counter substrate 4 and the counter electrodes 9 are preferably arranged on the substrate 4.
It is disposed on at least one of the peripheral portion and the partition wall 2. In addition, reference numerals 11 and 12 in the figure respectively denote leader lines from the display electrode 8 and the counter electrode 9.

The operation of each display element 1 in the apparatus constructed as described above is performed as follows. As shown in FIG. 1, the positively chargeable dry particles 6 and the negatively chargeable dry particles 7 having different colors are randomly arranged between the substrates 3 and 4 facing each other. When the power supply voltage is applied so that the display electrode 8 becomes the negative electrode and the counter electrode 9 becomes the positive electrode, the positively chargeable particles 6 are, as shown in FIG. 2, based on the action of the Coulomb force.
The negatively chargeable particles 7 fly to the counter electrode 9 side toward the display electrode 8 side. At this time, the display visually recognized from the transparent substrate 3 side has a shape having the color of the positively chargeable particles 6 and corresponding to the contour of the display electrode 8.

On the other hand, when the polarity of the power source is switched and a voltage is applied so that the display electrode 8 becomes the positive electrode and the counter electrode 9 becomes the negative electrode, the negatively charged particles 7 are displayed by the Coulomb force as shown in FIG. Flying to the electrode 8 for use as the positively charged particles 6
Flies to the side of the counter electrode 9. At this time, the display seen from the transparent substrate 1 side has a display electrode shape having the color of the negatively chargeable particles 7.

As described above, since the color and shape can be reversibly changed by reversing the polarity of the power source, for example, the negatively chargeable particles 7 are white,
When the positively chargeable particles 6 are black or the negatively chargeable particles 7 are black and the positively chargeable particles 6 are white, the display is a reversible display between white and black.

By the way, since the respective dry particles 6 and 7 thus moved are adhered to the electrodes by the image force, the displayed image is preserved for a long time even after the power is turned off, and the excellent memory is provided. The holding property will be exhibited.

Thus, in this case, each of the plurality of display elements 1 is appropriately operated as required, for example, independently of each other, so that required characters, symbols, figures, images, etc. are displayed as the entire apparatus. Of course you can
The display can be changed continuously. Further, since the display here is performed based on the reflected light, excellent visibility can be secured even in a bright place such as outdoors.

On the other hand, the advertising device here, that is, the display element 1 directly, should be thin as long as the structure is simple and the cost is low and the space for moving the dry particles 6 and 7 can be secured. And again,
Since the dry particles 6 and 7 are moved in flight with a small amount of power consumption, and the display can be maintained for a long period of time with excellent memory retention while turning off the power,
The running cost can be advantageously reduced. Further, the responsiveness of the display can be enhanced based on the instantaneous flight movement of the particles 6 and 7, and at the same time, the visibility of the display can be improved.
A wide visual field can be secured by performing direct external visual observation of the particles 6 and 7 through the transparent substrate 3. Furthermore, by increasing the number of the display elements 1 aligned and arranged,
The device can be easily and easily increased in size.

Since the display element 1 in such an advertising device, and further, in the advertising device, at least one substrate is a transparent substrate from which the color of particles can be confirmed from the outside of the device, the visible light transmittance is high. A material having high heat resistance is preferable, but the counter substrate may be transparent or opaque.

Further, in this device, since both the display electrode 8 and the counter electrode 9 are arranged on the counter substrate side, as shown in FIG. 4, the display electrode 8 is arranged on the transparent substrate side and the counter electrode 8 is arranged on the transparent substrate side. Compared with the case where 9 is arranged on the counter substrate side, the display electrode 8 does not need to be transparent, and therefore, there is an advantage that an inexpensive metal electrode having low resistance such as copper or aluminum can be used. .

On the other hand, as shown in FIG. 4, the display electrode 8 and the counter electrode 9 are disposed separately on the transparent substrate side and the counter substrate side with the dry particles 6 and 7 interposed therebetween. In addition, when the display electrode 8 is a transparent electrode,
By disposing both electrodes 8 and 9 over the entire display element 1, there is an advantage that the display area of each element 1 can be expanded.

When the display element 1 is constructed as shown in FIG. 4, when voltage is applied so that the display electrode 8 has a negative potential and the counter electrode 9 has a positive potential, as shown in FIG. 5 (a). The Coulomb force causes the positively charged particles 6 to fly to the display electrode 8 side and the negatively charged particles 7 to fly to the counter electrode 9 side. In this case, the positively charged particles 6 are positively moved from the transparent substrate 3 side. The color of the charging particles 6 will be visually recognized. On the other hand, when the polarity is changed and a voltage is applied so that the display electrode 8 has a positive potential and the counter electrode 9 has a negative potential, as shown in FIG. Flies to the display electrode 8 side, and the positively chargeable particles 7 move to the counter electrode 9
Since it flies to the side, the color of the negatively chargeable particles 7 is visible from the transparent substrate 3 side.

Here, between FIG. 5 (a) and FIG. 5 (b), it is possible to display repeatedly by simply reversing the polarity of the power supply, and by reversing the polarity of the power supply in this way, reversible The color can be changed. Then, even when the advertising device is configured by such a display element 1,
The same effect as described above can be obtained.

In the above device, the electrodes 8 and 9 are
It is preferable to form an insulating coat layer so that the charges of the charged dry particles 6 and 7 do not escape. Further, as the current for applying the external voltage to the electrodes 8 and 9, a direct current or a current in which an alternating current is superposed thereon can be used.

By the way, the dry particles 6 and 7 may be negative or positively charged colored particles as long as they fly and move by Coulomb's force, but spherical particles having a small specific gravity are particularly preferable. White and black particles are preferably used as the particles. The average particle size of the particles is 0.1 to 50 μm
Is preferred, and particularly preferably 1 to 30 μm. When the particle size is smaller than this range, the charge density of the particles is too large and the image force on the electrode or the substrate is too strong, and the memory property is good, but the followability when the electric field is reversed becomes poor. On the other hand, if the particle size is larger than this range, the followability is good, but the memory property becomes poor.

The method of negatively or positively charging the particles 6 and 7 is not particularly limited, but a method of charging the particles such as a corona discharge method, an electrode injection method and a friction method is used. The surface charge density of particles 6 and 7 is 5 to 150 in absolute value.
The range of μC / m ² is preferred. When the surface charge density is lower than this range, the response speed to changes in the electric field becomes slow and the memory property also becomes low. When the surface charge density is higher than this range, the image force on the electrode or the substrate is too strong and the memory property is good, but the followability when the electric field is reversed becomes poor.

The amount of charge and the specific gravity of particles used in the present invention for determining the surface charge density were measured as follows. The surface charge density was calculated from the charge amount and the specific gravity. <Blow-off measurement principle and method> In the blow-off method, a mixture of powder and carrier is placed in a cylindrical container having meshes at both ends, and high-pressure gas is blown from one end to separate the powder and carrier, Blow off only powder from the opening
(Blow away). At this time, a charge amount that is the same as the charge amount of the powder carried out of the container but is opposite to the charge amount remains on the carrier. And
All of the electric flux due to this charge is collected by the Faraday cage, and the capacitor is charged by this amount. Therefore, the electric charge of the powder is measured by measuring the potential across the capacitor.
Q is calculated as Q = CV (C: capacitor capacity, V: voltage across capacitor). As the blow-off powder charge amount measuring device, TB-200 manufactured by Toshiba Chemical Co. was used. In the present invention, two types of carriers, positively chargeable and negatively chargeable, are used, and the charge density per unit area (unit:
μC / m ² ) was measured. In other words, as a positively chargeable carrier (a carrier that makes the other party positively charged and is likely to become negative) F963-2535 made by Powdertech Co., Ltd., and a negatively charged carrier (the other party is negatively charged and itself becomes positively charged). As the easy carrier, F921-2535 manufactured by Powder Tech Co. was used. <Particle Specific Gravity Measuring Method> The particle specific gravity was measured with a specific gravity meter and multi-volume densitometer H1305 manufactured by Shimadzu Corporation.

Since the particles 6 and 7 are required to retain the charged electric charge, insulating particles having a volume resistivity of 1 × 10 ¹⁰ Ω · cm or more are preferable, and insulating particles having a volume resistivity of 1 × 10 ¹² Ω · cm or more are particularly preferable. Particles are preferred.

Further, as these particles, particles having a slow charge decay property evaluated by the method described below are more preferable. That is, the particles are separately formed into a film having a thickness in the range of 5 to 100 μm by pressing, heat melting, casting, etc., and a voltage of 8 kV is applied to a corona discharger arranged at a distance of 1 mm from the film surface to apply a corona A discharge is generated to charge the surface, and the change in the surface potential is measured and judged. In this case, the particle constituent material is selected so that the maximum value of the surface potential after 0.3 seconds is larger than 300 V, preferably larger than 400 V,
It is desirable to make them.

Such measurement of the surface potential can be carried out, for example, by the device (CRT2000 manufactured by QEA) shown in FIG. Here, both ends of the roll shaft having the above-mentioned film arranged on the surface are held by the chuck 21, and a small scorotron discharger 22 and a surface electrometer 23 are provided.
A measuring unit, which is separated from the film by a predetermined distance, is arranged to face the surface of the film with an interval of 1 mm, and the measuring unit is placed from one end to the other end of the roll shaft while the roll shaft is stationary. A method of measuring the surface potential while applying a surface charge by moving at a constant speed is suitably adopted. Here, the measurement environment is a temperature of 25 ± 3 ° C. and a humidity of 55 ± 5 RH%.

Such particles may be made of any material as long as the characteristics such as charging performance are satisfied. For example, it can be formed from a resin, a charge control agent, a colorant, an inorganic additive or the like, or a colorant alone.

Although there are no particular restrictions on the production examples of the particles, for example, the pulverization method and the polymerization method, which are similar to those used for producing electrophotographic toners, can be used, and the resin on the surface of the inorganic or organic pigment powder can be used. Also, a method of coating a charge control agent or the like may be used.

Further, the distance between the transparent substrate 3 and the counter substrate 4 of the display element 1 should be such that particles 6 and 7 can fly and move and the contrast can be maintained, but it is usually 10 to 5000 μm.
m, preferably 30 to 500 μm. The amount of particles filled between such substrates is a volume occupancy rate, and the volume is 10 to 80%, preferably 20 to 70% of the space volume between the substrates. good.

FIG. 7 is a diagram showing another embodiment in which the respective display elements arranged in a matrix form are transmissive. Each display element 31 here is a partition wall 3
Transparent display substrates 3 which are parallel to each other with two spaces between them
3 and the counter substrate 34, a pair of transparent electrodes 3 spaced apart from each other and positioned close to the respective substrates 33, 34.
5, 36 are provided, and these transparent electrodes 35,
36 is positioned in the central area of each of the substrates 33, 34,
Further, another pair of electrodes 37 and 38, which may or may not be transparent, are provided on the peripheral portions of the substrates 33 and 34, respectively.
5 and 36 are arranged adjacent to each other with an insulator 39 interposed therebetween, and a color filter 40 is provided between the display substrate 33 located on the upper side in the figure and the respective electrodes 35 and 37.
And a backlight 41 is disposed adjacent to the lower side of the counter substrate 34 located on the lower side, two kinds of dry particles 42 and 43 having different charging characteristics are provided between each pair of electrodes. Is filled.

Here, both substrates 33 and 34 and partition 32
Forms an airtight chamber similar to that in the above case, the substrate 33,
It is possible to prevent excessive movement of particles in the direction parallel to 34, and to improve durability and repeatability and memory retention.

In such a display element 31 of the advertising device, when a voltage is applied by a power source so that the transparent electrode 35 on the display substrate 33 side becomes a negative electrode and the transparent electrode 36 on the opposite side becomes a positive electrode, FIG. As shown in FIG. 5, the positively chargeable particles 42 are transferred to the transparent electrode 35 on the upper side of the figure by the Coulomb force acting on the particles.
And the negatively charged particles 7 fly to the electrode 36 on the opposite side. In this case, on the display surface viewed from the display substrate 33 side, the light from the backlight 41 is reflected by each particle 4
Since it is blocked by 2, 43, it is in a non-display state (usually black). On the other hand, by switching the polarity of the power source and dropping both transparent electrodes 35 and 36 to the ground, for example, the other pair of electrodes 37 and 38 on the display substrate side is the negative electrode and on the counter substrate side is the positive electrode. When a voltage is applied so that
As shown in FIG. 8B, the negatively chargeable particles 43 fly to the counter substrate side electrode 38, and the positively chargeable particles 42 fly to the display substrate side electrode 37. In this case, the display surface viewed from the display substrate 33 side is in a display state, and the color of the color filter 9 is visible. Since the backlight 41 is used here, bright and clear color display is provided.

Also in such a display element 31, FIG.
The display mode between (a) and FIG. 8 (b) can be repeated simply by switching the polarity of the power source, and the display can be reversibly changed. For example, the negatively chargeable particles 43 and the positively chargeable particles 42 are black and the color filter 4
When 0 is R (red), G (green) or B (blue), each color can be displayed.

Also in this display element 31, since the particles 42 and 43 are attached by the image force of the electrodes, the display image is retained for a long time even after the power is turned off.
Good memory retention. Further, since the charged particles fly and move in the gas by Coulomb force, the display speed is very fast and can be 1 msec or less.

FIG. 9 shows electrode pairs 37 and 38 other than the transparent electrode pair.
The display element 31 in which is installed inside the partition wall 32 is shown. The other configuration of the display element 31 is similar to that described above. In this display element 31, when a voltage is applied by a power source so that the transparent electrode 35 on the display substrate side becomes a negative electrode and the transparent electrode 36 on the opposite side becomes a positive electrode,
As shown in (a), the positively chargeable particles 42 fly and move to the electrode 35 side, and the negatively chargeable particles 43 fly and move to the electrode 36 side.

In this case, the display surface viewed from the display substrate 33 is in a non-display state (usually black) because the light from the backlight 41 is blocked by the particles 42 and 43. On the other hand, when the polarity of the power source is switched, the electrodes 35 and 36 are dropped to the ground, and a voltage is applied so that the electrode 37 becomes the positive electrode and the electrode 38 becomes the negative electrode, the Coulomb force is generated by the Coulomb force as shown in FIG. The negatively charged particles 43 fly to the electrode 37, and the positively charged particles 42 fly to the electrode 38. At this time, the display surface viewed from the display substrate 33 side is in a display state, and the color of the color filter 9 is visually recognized. Figure 10
The display mode between (a) and FIG. 10 (b) can be repeated by simply switching the polarity of the power source, and the color can be reversibly changed.

Also in the advertising device using the display element 31 as described above, based on the flying movement of the dry particles 42, 43, the required characters, symbols, figures, images, etc. are stopped as in the previous case. The display can be made to occur or continuously changed, and high visibility can be given to the display under the action of the backlight 41. And further, the structure of the device can be simplified, the device cost can be reduced, the device can be made thin, and the running cost can be reduced, and the device can be easily enlarged.
It may also allow the device to be used under harsh temperature conditions.

In this display element 31, the display substrate 3
Since both 3 and the counter substrate 34 are transparent substrates, it is preferable that both are made of a material having a high visible light transmittance and a high heat resistance. Examples of the substrate material include polymer sheets such as polyethylene terephthalate, polyether sulfone, polyethylene, polycarbonate, polyimide and acrylic, and inorganic sheets such as glass and quartz. The thickness of the substrate is 2 μm-5
000 μm is preferable, and particularly 5 to 1000 μm is preferable. If it is too thin, it becomes difficult to maintain strength, uniformity of the distance between the substrates and the like, and if it is too thick, the sharpness as a display function,
A decrease in contrast occurs.

Further, the pair of transparent electrodes 3 of the display element 31.
5 and 36 are formed of a transparent and patternable conductive material, such as a metal such as aluminum, silver, nickel, copper, or gold, or a transparent conductive metal oxide such as ITO, conductive tin oxide, or conductive zinc oxide. Sputtering method, vacuum deposition method, C
A thin film formed by a VD method, a coating method, or the like, or a conductive agent mixed with a solvent or a synthetic resin binder and applied can be used. As the other pair of electrodes 37 and 38, the transparent electrodes described above can be used. In addition to the materials that can be used, aluminum,
A non-transparent electrode material such as silver, nickel, copper or gold can also be used.

It is preferable that each electrode is formed with an insulating coat layer so that the charges of the charged particles do not escape. This coat layer is particularly preferable when a positively chargeable resin is used for the negatively chargeable particles and a negatively chargeable resin is used for the positively chargeable particles because the charge of the particles is difficult to escape. By the way, each dry particle 4 to be enclosed in the display element 31 is
It is preferable that the particle diameters of 2, 43, the charge amount and other physical properties, the filling amount, and the like are the same as those described above.

[0047]

As is apparent from the above description, according to the reversible display advertising device of the present invention, which is constituted by the reflective or transmissive display element to which dry particles having different charging characteristics are applied, Is used as a rooftop advertisement, indoor / outdoor wall advertisement, train, train, or other in-car advertisement,
With a simple structure, it is possible to realize static display based on high memory retention of dry particles and continuously changing display such as moving images with low running cost, under low equipment cost and sufficient thinning. Also, by enabling direct visual recognition of particles or color filters, it is possible to secure a sufficiently wide field of view. Furthermore, in reflective elements, compared with liquid crystal display elements, Due to the high reflectance due to the much smaller number of intervening members, and in the transmissive element, excellent visibility can be ensured even in bright places due to the effect of the backlight.

Moreover, in this advertising device in which the display elements are arranged in a matrix, the display area can be easily increased by increasing the number of display elements. In addition, by imparting the required polarity to the electrodes, it is possible to always and reliably fly the dry particles regardless of the environmental temperature, so even under severe temperature conditions. The display can be made exactly as expected.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the apparatus shown in FIG.

FIG. 3 is an operation explanatory view of the apparatus shown in FIG.

FIG. 4 is a cross-sectional view showing another arrangement mode of two types of electrodes.

5 is an explanatory view of the operation of the device shown in FIG.

FIG. 6 is a diagram showing a procedure for measuring the surface potential of particles.

FIG. 7 is a sectional perspective view showing another embodiment of the present invention.

FIG. 8 is an operation explanatory view of the apparatus shown in FIG.

FIG. 9 is a cross-sectional view showing another arrangement mode of two pairs of polarities.

FIG. 10 is an operation explanatory view of the apparatus shown in FIG.

[Explanation of symbols]

1,31 Display element 2,32 partitions 3 transparent substrate 4,34 Counter substrate 5 airtight chamber 6,7,42,43 Dry particles 8 Display electrodes 9 Counter electrode 10,39 insulator 11,12 Leader wire 33 display board 35,36 transparent electrode 37, 38 electrodes 40 color filters 41 Backlight

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) (72) Inventor Manabu Yakushiji 3-2-6 Ogawahigashi-cho, Kodaira-shi, Tokyo (72) Inventor So Kitano Tokyo 3-5-5 Ogawa Higashi-cho, Kodaira City (72) Inventor Yoshitomo Masuda 3-5-28 Shinmeidai, Hamura City, Tokyo (72) Inventor Takahiro Kawagoe 1302-57 Aobadai, Tokorozawa City, Saitama Prefecture

Claims (10)

[Claims] 1. A transparent substrate and a counter substrate, which faces the transparent substrate, are filled with two kinds of dry particles having different colors and different charging characteristics, and an electrostatic field is applied to the particles. A reversible display advertising device in which a plurality of display elements each having electrodes of different types are aligned and arranged, and each electrode of each display element can be given a required polarity. 2. The reversible display advertisement apparatus according to claim 1, wherein two types of electrodes of the display element are arranged on the counter substrate side. 3. The reversible display advertisement according to claim 1, wherein the two kinds of electrodes of the display element are arranged separately on the transparent substrate side and the counter substrate side, and the transparent substrate side electrode is a transparent electrode. apparatus. 4. The reversible display advertising device according to claim 1, wherein the color of the dry particles is white or black. 5. Two types of dry particles having different charging characteristics are enclosed between two transparent substrates facing each other, and two pairs of electrodes for applying an electrostatic field to the particles and a color filter are arranged. Then, a plurality of display elements, each of which has a backlight disposed on the outer side of one of the transparent substrates located apart from the color filter, are arranged in an aligned manner, and each electrode of each display element has a required polarity. A reversible display advertisement device that can be attached. 6. The reversible display advertising device according to claim 5, wherein the color of the dry particles is black. 7. The average particle size of dry particles is 0.1 to 50 μm.
The reversible display advertisement device according to any one of claims 1 to 6, wherein m is m. 8. The surface charge density of dry particles is 5 in absolute value.
The reversible display advertising device according to any one of claims 1 to 7, wherein the reversible display advertising device is about 150 µC / m ² . 9. When the dry particles generate a corona discharge by applying a voltage of 8 kV to a corona discharger arranged at a distance of 1 mm from the surface, the surface is charged,
The reversible display advertising device according to any one of claims 1 to 8, which is a particle whose maximum surface potential after 0.3 seconds is larger than 300V. 10. Of the two pairs of electrodes, one pair is a transparent electrode pair arranged in the central portion of the substrate, and the other pair is an electrode pair arranged in at least one of the peripheral portion and the partition wall of the substrate. Item 10. The reversible display advertising device according to any one of Items 5 to 9.