JP5231730B2 - Information display medium - Google Patents

Description

  The present invention relates to an information display medium for reversibly displaying information by reversing, migrating or moving charged particles according to a charge pattern.

  In recent years, research and development of a new information display medium called a rewritable paper, which is thin and light like paper and capable of reversibly rewriting and displaying visible information such as characters and images, has been actively conducted. This information display medium is roughly classified into a wet type and a dry type, and a twist ball type known as one form of the wet type information display medium has a transparent resin binder coated on a substrate. A plurality of cavities are formed, and each cavity contains spherical or short cylindrical rotating particles having different colors and charging characteristics on the front and back sides, and a dielectric liquid that rotatably surrounds the rotating particles. The display is performed by controlling the direction of the rotating particles to be reversed by the charge pattern applied from the resin binder. In addition, a microcapsule that is also of the twist ball type and that includes rotating particles having different colors and charging characteristics on the front and back sides and a dielectric liquid that rotatably surrounds the rotating particles is coated on a substrate. It is also known that a display is performed by dispersing and arranging in a processed transparent resin binder, and controlling the direction of rotating particles to be reversed by a charge pattern applied from the resin binder. In the case of a microcapsule electrophoresis method known as another form of a wet information display medium, a microcapsule containing a large number of charged particles and a dielectric liquid is coated on a substrate. The dispersion is arranged in the transparent resin binder, and the display is performed by controlling the migration of the charged particles according to the charge pattern applied from the resin binder. Furthermore, although it is not a paper mode, it is an electrophoretic display device that does not use microcapsules, and a large number of charged particles and a dielectric liquid are sealed between a pair of opposed substrates, at least one of which is transparent, and applied from above the substrate. Also known is a display configured to perform display by controlling migration of charged particles according to the charge pattern (see, for example, Patent Document 1), and such a configuration can also be applied to a paper-type information display medium. It is.

  On the other hand, as a dry-type information display medium, for example, a large number of charged particles and gas are enclosed between a pair of opposed substrates, at least one of which is transparent, and the movement of the charged particles is controlled by a charge pattern applied from the substrate. An inter-substrate encapsulating system configured to perform display is known (for example, see Patent Document 2).

  In the wet information display medium as described above, the resin binder in the twist ball method or the microcapsule electrophoresis method, the substrate on the side to which at least the charge pattern is given in the electrophoresis method not using the microcapsule, or the dry information An insulating resin is used for holding an electrostatic latent image charge corresponding to a given charge pattern on at least a substrate to which a charge pattern is given in the display medium, and the outer surface of the insulating resin Visible information such as characters and images is displayed by controlling the direction of rotating particles and the migration and movement of charged particles by an electric field generated according to the charge pattern given by some means. Even without giving a pattern, the display state is maintained by the electrostatic latent image charge held on the outer surface of the insulating resin. It has become the jar.

  By the way, in the information display medium in which the display state is maintained by the electrostatic latent image charge held on the outer surface of the insulating resin as described above, when a finger or the like comes into contact with the outer surface of the insulating resin, the contact is made. In some cases, the electrostatic latent image charge of the portion moves on the insulating resin in accordance with the movement of the finger or the like, or is discharged through the human body, thereby disturbing the display state of the visible information.

Therefore, in a wet information display medium, a dispersion medium (see, for example, Patent Document 3) having a property of solidifying at room temperature and melting by heating, or a liquid material having thixotropy (for example, Patent Document). 4) is used as a dielectric liquid, and a method of ensuring the stability of visible information against contact with a human body such as a finger is considered. That is, when a dispersion medium having the characteristics of solidifying at room temperature and melting by heating is used as the dielectric liquid, when the visible liquid is rewritten, the dielectric liquid is heated and melted by an appropriate heating means. The visible information can be rewritten by applying an electric field. After the rewriting, the dielectric liquid returns to room temperature and the dielectric liquid solidifies, so that the display state of visible information can be maintained for a long period of time. it can. In addition, when a liquid material having thixotropy is used as a dielectric liquid, the display state of visible information can be maintained over a long period of time due to the high viscosity of the dielectric liquid when no electric field is applied. On the other hand, when a Coulomb force of a certain level or more is applied to the particles by applying an electric field at the time of rewriting visible information, the viscosity of the dielectric liquid is lowered and the particles can be rotated or migrated. Therefore, by using such a dielectric liquid having heat melting property or thixotropy property, an information display medium capable of displaying stable visible information that is not affected by human contact can be obtained.
JP-A-6-202168 Japanese Utility Model Publication No. 2005-128501 JP-A-8-179706 Japanese Utility Model Publication No. 2002-131790

  However, in both conventional wet and dry information display media, the electrostatic latent image charge is held on the outer surface of the insulating resin, so that when the visible information is rewritten, the held electrostatic There is a problem that the visible information cannot be rewritten unless the latent image charge is removed.

  It is an object of the present invention to provide an information display medium that can prevent disturbance of display information due to contact with the human body and that does not require removal of electrostatic latent image charges when rewriting visible information. .

In the present invention, a large number of cavities are formed in a transparent resin binder coated on a base material, and rotating particles that have different colors and charging characteristics on the front and back in each cavity are rotatably surrounded. In an information display medium in which a dielectric liquid is contained and display is performed by reversing the direction of rotating particles by a charge pattern applied from the resin binder, the resin binder has a surface resistivity of 10 ^4. It is an information display medium characterized by using a semiconductive resin of 10 to ¹² Ω / □.

  Here, the charge pattern is a collective form of charges arranged and distributed so as to correspond to visible information shapes such as characters and images.

  In the above configuration, as the semiconductive resin, a resin having an isocyanate group mixed with an ion conductive polymer is preferably used, and the surface resistivity is set by adjusting the mixing rate of the ion conductive polymer. obtain.

The present invention also provides a transparent resin binder in which a microcapsule encapsulating rotating particles having different colors and charging characteristics on the front and back sides and a dielectric liquid that rotatably surrounds the rotating particles is coated on a substrate. In an information display medium that is arranged in a dispersed manner and performs display by controlling the direction of rotating particles in accordance with the charge pattern applied from the resin binder, the resin binder has a surface resistivity of 10 ⁴ to 10. An information display medium using a semiconductive resin of ¹² Ω / □.

  Even in this configuration, as described above, a resin having an isocyanate group mixed with an ion conductive polymer is preferably used as the semiconductive resin. The resistivity can be set.

In the present invention, a microcapsule containing a large number of charged particles and a dielectric liquid is dispersed and arranged in a transparent resin binder coated on a substrate, and a charge pattern given from the resin binder is provided. Thus, in the information display medium for performing display by controlling the migration of charged particles, a semiconductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used as the resin binder. It is a display medium.

  Even in this configuration, as described above, a resin having an isocyanate group mixed with an ion conductive polymer is preferably used as the semiconductive resin. The resistivity can be set.

In the present invention, a large number of charged particles and a dielectric liquid are sealed between a pair of opposing substrates, at least one of which is transparent, and the charged particles are electrophoresed and displayed according to a charge pattern applied from the substrate. In this information display medium, a semiconductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used for the substrate to which the charge pattern is applied.

  Even in this configuration, as described above, a resin having an isocyanate group mixed with an ion conductive polymer is preferably used as the semiconductive resin. The resistivity can be set.

  In each of the wet information display media described above, a configuration is proposed in which the dielectric liquid is solidified at room temperature and has a characteristic of melting by heating.

  Further, instead of the above characteristics, the dielectric liquid may have a thixotropic property.

Further, in the present invention, a large number of charged particles and gas are sealed between a pair of opposing substrates, at least one of which is transparent, and display is performed by controlling movement of the charged particles according to a charge pattern applied from the substrate. In the information display medium, a semiconductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used for a substrate to which a charge pattern is applied.

  Even in the configuration of such a dry information display medium, a resin having an isocyanate group mixed with an ion conductive polymer is preferably used as the semiconductive resin, and the mixing ratio of the ion conductive polymer is adjusted. As a result, the surface resistivity can be set.

As described above, the present invention is a wet information display medium, a resin binder in a twist ball system or a microcapsule electrophoresis system, a substrate on a side to which a charge pattern is applied in an electrophoresis system without using a microcapsule, Alternatively, in the dry information display medium, a semiconductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used for the substrate on the side to which the charge pattern is given. When a charge pattern is given to the surface by ion flow, the direction of rotating particles and the migration and movement of charged particles are controlled by the electric field generated according to the charge pattern, and visible information such as characters and images can be displayed. . Here, when the resin binder or the substrate is semiconductive, when a charge pattern is given, the charge pattern is temporarily held on the surface of the resin binder or substrate by the semiconductive insulating characteristic, As described above, the direction of rotating particles and the migration and movement of charged particles are controlled by the strong electric field strength of the charge pattern, but after that, the temporarily held charge pattern is semiconductive. Dissipates and disappears due to properties. That is, the semiconductive resin can obtain an effect of dispersing and disappearing after temporarily holding the charge. Further, the rotating particles and the charged particles are held at their positions by the intermolecular attractive force (Van der Walls force), and thereby the display state of the visible information is maintained. In this way, the applied charge pattern disappears as an electrostatic latent image charge without being held on the outer surface of the semiconductive resin indefinitely. The visible information is not disturbed, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

  In each of the wet information display media described above, the dielectric liquid is solidified at room temperature and melted by heating. When heated and melted by heating means, particles can be rotated or migrated, and the visible information can be rewritten. After the rewriting, the dielectric liquid returns to room temperature and the dielectric liquid solidifies. The stability of the display state can be further improved.

  In addition, in the configuration in which the dielectric liquid has thixotropy, if a Coulomb force of a certain level or more is applied to the particles by applying an electric field when rewriting visible information, the viscosity of the dielectric liquid decreases. Visible information can be rewritten by rotating or migrating particles. After the rewriting, if the Coulomb force is lost, the dielectric liquid becomes highly viscous and the visible information display state is maintained. Stability can be further improved.

Below, the 1st Example of this invention is described based on FIG.
In the first embodiment, the present invention is applied to a twist ball type rewritable paper known as a wet information display medium. In this rewritable paper 1A, a large number of cavities 4 are formed in a transparent resin binder 3 coated on a substrate 2, and the rotating particles 5 having different colors and charging characteristics on the front and back sides are formed in the cavities 4. A dielectric liquid 6 surrounding the particles 5 in a rotatable manner is contained.

  The substrate 2 is formed of a flexible thin film and lightweight material such as paper, synthetic paper, synthetic resin film, synthetic resin sheet and the like. The rotating particles 5 are color-coded into white and black for each hemisphere, the white hemisphere is charged with a negative charge, and the black hemisphere is charged with a positive charge. When a negative charge pattern is applied to the surface of the resin binder 3, the rotating particles 5 rotate and the black hemisphere having a positive charge faces upward, so that black is visually recognized from the surface of the resin binder 3, and the resin binder 3 When a positive charge pattern is applied to the surface of the resin, the rotating particle 5 rotates and the white hemisphere having a negative charge faces upward, so that white is visually recognized from the surface of the resin binder 3. The direction of each rotating particle 5 is controlled to be reversed by the electric field generated according to the charge pattern as described above, so that visible information can be displayed. The color classification of the rotating particles 5 for each hemisphere may be a combination of different colors other than black and white. In addition to the spherical shape, the rotating particles 5 may be short cylinders having different colors and charging characteristics on the front and back sides.

The resin binder 3 is made of a semiconductive resin in which an ion conductive polymer is mixed at a predetermined ratio into a resin having an isocyanate group such as a urethane resin, and the semiconductive resin is adjusted by adjusting the mixing rate of the ion conductive polymer. The surface resistivity of the conductive resin is set. In the present invention, the surface resistivity of the semiconductive resin is 10 ⁴ to 10 ¹² Ω / □, preferably 10 ¹⁰ to 10 ¹¹ Ω / □. Here, when the surface specific resistivity exceeds 10 ¹² Ω / □, the insulating property becomes too high, and the charge is retained for an indefinite period, and the surface specific resistivity is less than 10 ⁴ Ω / □. This is not preferable because the conductivity becomes too high and it is difficult to temporarily hold the electric charge. The ion conductive polymer is an ion conductive conductivity imparting agent, and PEL (trade name) manufactured by Nippon Carlit Co., Ltd. can be suitably used for this. For the resin having an isocyanate group, Takenate WD (trade name) can be suitably used as a urethane resin manufactured by Mitsui Takeda Chemical Co., Ltd.

  In such a configuration, when a charge pattern is given to the surface of the resin binder 3 by ion flow, the resin binder 3 is semiconductive, so that the charge pattern is formed on the surface of the resin binder 3 due to the semiconductive insulating properties. The orientation of each rotating particle 5 is controlled by the strong electric field strength of the charge pattern at this time, and visible information such as characters and images can be displayed. Thereafter, the temporarily held charge pattern is dispersed and disappears due to the semiconductive conductive characteristics. Further, each rotating particle 5 is held in its position by an intermolecular attractive force (Van der Walls force), whereby the display state of visible information is maintained. Since the applied charge pattern disappears without being held in the resin binder 3 made of a semiconductive resin as an electrostatic latent image charge in this way, a finger or the like comes into contact with the surface of the resin binder 3. In this case, the visible information is not disturbed due to the movement or discharge of the charge, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

  FIG. 2 shows a second embodiment of the present invention. This second embodiment is an application of the present invention to another form of twisted ball type rewritable paper known as a wet information display medium. is there. In this rewritable paper 1B, a large number of microcapsules 7 including rotating particles 5 having different colors and charging characteristics on the front and back sides and a dielectric liquid 6 surrounding the rotating particles 5 in a rotatable manner are formed on a substrate 2. Dispersed and arranged in the coated transparent resin binder 3. In addition, the other structure and the inversion control method of each rotating particle 5 are the same as the first embodiment, and redundant description is omitted.

As in the first embodiment, the resin binder 3 is made of a semiconductive resin in which an ion conductive polymer is mixed at a predetermined ratio into a resin having an isocyanate group such as a urethane resin, and has a surface resistivity of 10 ⁴ to 10 ⁴ . Those set to 10 ¹² Ω / □, preferably 10 ¹⁰ to 10 ¹¹ Ω / □ are used.

  In this configuration, when a charge pattern is given to the surface of the resin binder 3 by ion flow, the resin binder 3 is semiconductive, so that the charge pattern is semiconductive as in the first embodiment. It is temporarily held on the surface of the resin binder 3 due to the insulating properties, and at this time, the direction of each rotating particle 5 is controlled by the strong electric field strength of the charge pattern, so that visible information such as characters and images can be displayed. it can. Thereafter, the temporarily held charge pattern is dispersed and disappears due to the semiconductive conductive characteristics. Further, each rotating particle 5 is held in its position by an intermolecular attractive force (Van der Walls force), whereby the display state of visible information is maintained. Since the applied charge pattern disappears without being held in the resin binder 3 made of a semiconductive resin as an electrostatic latent image charge in this way, a finger or the like comes into contact with the surface of the resin binder 3. In this case, the visible information is not disturbed due to the movement or discharge of the charge, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

  FIG. 3 shows a third embodiment of the present invention. In the third embodiment, the present invention is applied to a rewritable paper of a microcapsule electrophoresis system that is known as a wet information display medium. In this rewritable paper 1 </ b> C, a large number of microcapsules 9 including a large number of charged particles 8 and a dielectric liquid 6 are dispersedly arranged in a transparent resin binder 3 coated on a substrate 2.

  Here, the charged particles 8 are colored white and charged with a negative charge. The dielectric liquid 6 is colored blue. When a negative charge pattern is applied to the surface of the resin binder 3, the charged particles 8 having a negative charge move to the lower part of the microcapsule 9, so that blue is visually recognized from the surface of the resin binder 3. Further, when a positive charge pattern is given to the surface of the resin binder 3, the charged particles 8 move to the upper part of the microcapsule 9, and thus white is visually recognized from the surface of the resin binder 3. The charged particles 8 in each microcapsule 9 are controlled by the electric field generated according to the charge pattern as described above, so that visible information can be displayed. The color classification of the charged particles 8 and the dielectric liquid 6 may be a combination of different colors other than white and blue.

As in the first embodiment, the resin binder 3 is made of a semiconductive resin in which an ion conductive polymer is mixed at a predetermined ratio into a resin having an isocyanate group such as a urethane resin, and has a surface resistivity of 10 ⁴ to 10 ⁴ . Those set to 10 ¹² Ω / □, preferably 10 ¹⁰ to 10 ¹¹ Ω / □ are used.

  In this configuration, when a charge pattern is given to the surface of the resin binder 3 by ion flow, the resin binder 3 is semiconductive, so that the charge pattern is semiconductive as in the first embodiment. Temporarily held on the surface of the resin binder 3 due to the insulating characteristics, and at this time, the charged particles 8 in each microcapsule 9 are controlled by the strong electric field strength of the charge pattern, so that visible information such as characters and images is displayed. Can be displayed. Thereafter, the temporarily held charge pattern is dispersed and disappears due to the semiconductive conductive characteristics. Further, each charged particle 8 is held in its position by an intermolecular attractive force (Van der Walls force), whereby the display state of visible information is maintained. Since the applied charge pattern disappears without being held in the resin binder 3 made of a semiconductive resin as an electrostatic latent image charge in this way, a finger or the like comes into contact with the surface of the resin binder 3. In this case, the visible information is not disturbed due to the movement or discharge of the charge, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

  FIG. 4 shows a fourth embodiment of the present invention. This fourth embodiment is an application of the present invention to an electrophoretic rewritable paper which is in a wet information display medium and does not use microcapsules. . In this rewritable paper 1D, a large number of charged particles 8 and a dielectric liquid 6 are sealed between a pair of substrates 2a and 2b that are vertically opposed to each other.

  The substrates 2a and 2b are formed of a flexible thin film and lightweight material such as a synthetic resin film and a synthetic resin sheet, and the upper substrate 2a to which a charge pattern is applied is transparent. The lower substrate 2b can be made of non-penetrating paper or synthetic paper. The charged particles 8 are colored white and charged with a negative charge. On the other hand, the dielectric liquid 6 is colored blue. When a negative charge pattern is applied to the surface of the upper substrate 2a, the charged particles 8 having a negative charge move downward, so that blue is visually recognized from the surface of the upper substrate 2a. Further, when a positive charge pattern is applied to the surface of the upper substrate 2a, the charged particles 8 move upward, so that white is visually recognized from the surface of the upper substrate 2a. In addition, visible information can be displayed by controlling the migration of the charged particles 8 by the electric field generated according to the charge pattern. The color classification of the charged particles 8 and the dielectric liquid 6 may be a combination of different colors other than white and blue.

Similar to the first embodiment, the upper substrate 2a to which a charge pattern is applied is made of a semiconductive resin in which an ion conductive polymer is mixed in a predetermined ratio into a resin having an isocyanate group such as a urethane resin, and has a surface-specific property. The resistivity is set to 10 ⁴ to 10 ¹² Ω / □, preferably 10 ¹⁰ to 10 ¹¹ Ω / □.

  In such a configuration, when a charge pattern is applied to the surface of the upper substrate 2a by ion flow, the substrate 2a is semiconductive, so that the charge pattern is semiconductive as in the first embodiment. It is temporarily held on the surface of the substrate 2a by the insulating property, and at this time, each charged particle 8 is controlled by the strong electric field strength of the charge pattern to display visible information such as characters and images. it can. Thereafter, the temporarily held charge pattern is dispersed and disappears due to the semiconductive conductive characteristics. Further, each charged particle 8 is held in its position by an intermolecular attractive force (Van der Walls force), whereby the display state of visible information is maintained. Thus, the given charge pattern disappears without being held on the substrate 2a made of a semiconductive resin as an electrostatic latent image charge indefinitely, so that even if a finger or the like comes into contact with the surface of the substrate 2a The visible information is not disturbed due to the movement or discharge, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

  In the configurations of the first to fourth embodiments described above, the dielectric liquid 6 may be provided with a property of solidifying at room temperature and melting by heating. The dielectric liquid 6 having this characteristic is in a solid phase at room temperature (a range of about 10 to 35 ° C.) and a liquid phase state when heated to a temperature higher than the room temperature (a range of about 40 to 80 ° C.). For example, organic compounds, natural waxes such as paraffin wax and carnauba wax, synthetic waxes such as carboxylic acid wax, fatty acid ester, petrolatum, natural resin or synthetic resin, etc. Things can be used. Then, by using the dielectric liquid 6 having the above characteristics, when the dielectric liquid 6 is heated and melted by an appropriate heating means at the time of rewriting visible information, the rotating particles 5 rotate. Alternatively, the charged particles 8 can be migrated so that the visible information can be rewritten. After the rewriting, the dielectric liquid 6 is returned to room temperature, and the dielectric liquid 6 is solidified at the same time. Can be further improved.

  Further, in the configurations of the first to fourth embodiments described above, the dielectric liquid 6 may have a thixotropic property. This thixotropic property is obtained by adding a predetermined amount of a thixotropic agent to the dielectric liquid 6. Examples of the thixotropic agent include sodium alginate, polyvinyl alcohol, modified sodium polyacrylate, modified polyacrylic acid emulsion, and modified polyacrylic acid sulfonate. Then, by using the dielectric liquid 6 having the thixotropy as described above, when a Coulomb force of a certain level or more is applied to the rotating particles 5 or the charged particles 8 by applying an electric field at the time of rewriting visible information, The viscosity of the conductive liquid 6 decreases, and the rotation of the rotating particles 5 or the migration of the charged particles 8 becomes possible, so that the visible information can be rewritten. After the rewriting, if the Coulomb force is lost, the dielectric liquid 6 becomes highly viscous. Since the display state of visible information is maintained, the stability of the display state can be further improved.

  FIG. 5 shows a fifth embodiment of the present invention. In the fifth embodiment, the present invention is applied to an inter-substrate encapsulated rewritable paper known as a dry information display medium. In the rewritable paper 1E, a large number of charged particles 8a and 8b and a gas 10 are sealed between a pair of substrates 2a and 2b that are vertically opposed to each other.

  The substrates 2a and 2b are formed of a flexible thin film and lightweight material, such as a synthetic resin film and a synthetic resin sheet, as in the fourth embodiment described above, and an upper side to which a charge pattern is applied. The substrate 2a is transparent. The lower substrate 2b can be made of paper or synthetic paper. The charged particles 8a are colored white and charged with a negative charge, and the charged particles 8b are colored black and charged with a positive charge. As the gas 10 enclosed between the substrates 2a and 2b, dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, or the like can be used. When a negative charge pattern is applied to the surface of the upper substrate 2a, the black charged particles 8b having a positive charge move upward, so that black is visually recognized from the surface of the upper substrate 2a. Further, when a positive charge pattern is applied to the surface of the upper substrate 2a, the white charged particles 8a having a negative charge move upward, so that white is visually recognized from the surface of the upper substrate 2a. Then, the movement of the charged particles 8a and 8b is controlled by the electric field generated according to the charge pattern as described above, so that visible information can be displayed. The color classification of the charged particles 8a and 8b may be a combination of different colors other than black and white. Further, if necessary, the space between the substrates 2a and 2b can be partitioned by a plurality of partition walls to form a cell structure.

Similar to the first embodiment, the upper substrate 2a to which a charge pattern is applied is made of a semiconductive resin in which an ion conductive polymer is mixed in a predetermined ratio into a resin having an isocyanate group such as a urethane resin, and has a surface-specific property. The resistivity is set to 10 ⁴ to 10 ¹² Ω / □, preferably 10 ¹⁰ to 10 ¹¹ Ω / □.

  In such a configuration, when a charge pattern is applied to the surface of the upper substrate 2a by ion flow, the substrate 2a is semiconductive, so that the charge pattern is semiconductive as in the first embodiment. Is temporarily held on the surface of the substrate 2a due to the insulating property, and at this time, the charged particles 8a and 8b are moved and controlled by the strong electric field strength of the charge pattern to display visible information such as characters and images. be able to. Thereafter, the temporarily held charge pattern is dispersed and disappears due to the semiconductive conductive characteristics. Each charged particle 8a, 8b is held in its position by an intermolecular attractive force (Van der Walls force), thereby maintaining the display state of visible information. Thus, the given charge pattern disappears without being held on the substrate 2a made of a semiconductive resin as an electrostatic latent image charge indefinitely, so that even if a finger or the like comes into contact with the surface of the substrate 2a The visible information is not disturbed due to the movement or discharge, and it is not necessary to remove the electrostatic latent image charge when rewriting the visible information.

It is a schematic sectional drawing of rewritable paper 1A concerning a 1st Example. It is a schematic sectional drawing of the rewritable paper 1B concerning a 2nd Example. It is a schematic sectional drawing of rewritable paper 1C concerning a 3rd Example. It is a schematic sectional drawing of rewritable paper 1D concerning 4th Example. It is a schematic sectional drawing of the rewritable paper 1E concerning 5th Example.

Explanation of symbols

1A, 1B, 1C, 1D, 1E Rewritable paper (information display medium)
2 Substrate 2a, 2b Substrate 3 Resin binder 4 Cavity 5 Rotating particle 6 Dielectric liquid 7 Microcapsule 8, 8a, 8b Charged particle 9 Microcapsule 10 Gas

Claims (5)

A large number of cavities are formed in a transparent resin binder coated on a substrate, rotating particles having different colors and charging characteristics on the front and back in each cavity, and a dielectric liquid that rotatably surrounds the rotating particles In the information display medium that displays by controlling the reversal of the direction of the rotating particles by the charge pattern given from the resin binder,
A semi-conductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used as the resin binder. Microcapsules enclosing rotating particles having different colors and charging characteristics on the front and back sides and a dielectric liquid that rotatably surrounds the rotating particles are dispersedly arranged in a transparent resin binder coated on a substrate. In the information display medium that performs display by controlling the direction of the rotating particles to be reversed by the charge pattern given from the resin binder,
A semi-conductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used as the resin binder. A microcapsule containing a large number of charged particles and a dielectric liquid is dispersed and arranged in a transparent resin binder coated on a substrate, and the charged particles are migrated according to the charge pattern given from the resin binder. In an information display medium for controlling and displaying,
A semi-conductive resin having a surface resistivity of 10 ⁴ to 10 ¹² Ω / □ is used as the resin binder.   4. The information display medium according to claim 1, wherein the dielectric liquid has a property of solidifying at room temperature and melting by heating.   The information display medium according to claim 1, wherein the dielectric liquid has thixotropic properties.

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