JPH05265380A - Display system using magnetic ink - Google Patents

Abstract

PURPOSE:To enable the control of a change in colors in dot unit by magnetic materials and magnetic ink with a device for displaying characters, images, etc., by controlling a change in the color of dot units. CONSTITUTION:A display material consisting of white particles 6 of a liquid form and black magnetic ink 7 and having an equiv. sp. gr. is encapsulate in each of the blocks enclosed by bottom plates consisting of transparent magnetic materials 2 on the front surface, transparent resins 1 for protection which prevent the interference of the light having the refractive index equal to the refractive index of the transparent magnetic materials 2, grating materials 3 for the blocks having a shielding property to magnetism arbitrary magnetic materials 4. and the resins 5 for protection in the structure of the sectional diagram of the display device. The white particles 6 of the liquid form and the black ink 7 are formed of materials which do not dissolve each other and do not induce a chemical reaction even if both coexist. The magnetization of the blocks of the transparent magnetic materials 2 and the arbitrary magnetic materials 4 is controlled in dot unit, by which the arbitrary black or white characters are displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for displaying characters, images, etc. by controlling the color change in dot units.
In particular, the present invention relates to a method of controlling the operation of a magnetic ink enclosed between a transparent magnetic material and an arbitrary magnetic material to control the magnetization and demagnetization of the transparent magnetic material and the arbitrary magnetic material according to the purpose.

A device for displaying characters, images, etc. by controlling color change in dot units has been conventionally used as a display medium for paper, board (blackboard, OA), liquid crystal, CRT, etc., and has advantages and disadvantages. Used as a display device. However, these display devices require electric energy to store the displayed contents,
Difficulty may occur when the state after the display contents are erased is returned to the same as before the display.

[0003]

2. Description of the Related Art When paper is used as a conventional display medium, the display method is performed by pressing particles different from the paper by applying pressure on the surface (particles are attached to grooves on the surface). The displayed content can be stored and erased without energy required for storage, and can be stored as long as the particles do not separate from the surface.However, the displayed content is erased by scraping the surface. The above deterioration is inevitable.

Next, a board (blackboard, OA) is used as a display medium.
When using, the display method is performed by depositing particles having a different color from that of the boat on the surface. The displayed contents can be stored and erased without requiring energy for storage and can be stored as long as the particles do not separate from the surface.However, to erase the displayed contents, wipe off the particles attached to the grooves on the surface. Since this is done by the above method, the damage on the display surface is small, but it is difficult to completely wipe off the adhered particles.

When a liquid crystal is used as a display medium,
The display method is performed by changing the light utilizing the refractive index of the liquid crystal. The display content storage and deletion method requires a certain voltage for storage, and the display content is erased by erasing an applied voltage. It has the advantage that it can be returned to the same state as.

Further, when a CRT is used as a display medium, the display method is such that energy is applied to a dot position on the screen corresponding to a character or figure to be displayed. The display content storage and deletion method requires a certain voltage for storage, and the display content is erased by erasing an applied voltage. It is possible to return to the same state as.

[0007]

As described above, when paper or a board is used as a display medium, there is an advantage that energy for storage is not required. However, when the display contents are erased, the display contents are displayed. There are drawbacks such as deterioration of the surface and complete removal of adhered particles. on the other hand,
When a liquid crystal or CRT is used as a display medium, there is a disadvantage that a constant voltage is required for storage, but the advantage is that the state on the surface after erasing can be returned to the same state as before display. There is.

It is an object of the present invention to develop a display system which does not require energy for storing displayed contents and which can return the state after erasing the displayed contents to the same as before the displaying. .. Therefore, magnetic display is used for the display medium, and as a display method, the magnetic medium on the surface is operated by applying magnetism to the dot position on the screen corresponding to the character or figure to be displayed, and the display content is erased. Is a method of applying magnetism to the display back surface at the displayed dot position.

[0009]

FIG. 1 is a block diagram showing the principle of the present invention. FIG. 1A shows an outline view of the display device.
(B) shows the structure of the cross-sectional view of the display device. FIG. 1A shows the display of each dot when the display device expresses the character "7", and FIG. 1B shows the principle diagram of the structure of the cross-sectional view of the dotted line portion. One dot consists of a section of about 0.2 mm.

In FIG. 1A, the horizontal axis is X and the vertical axis is Y.
Then, when expressing the character "7", this method allows Y5X3, Y6X3, Y6X4, Y6X5, Y5X5, Y4X5, Y3X4, Y2X4, Y1X4
The display is performed by changing the color at the position of. If the number of dots on the horizontal axis is n and the number of dots on the vertical axis is m,
The section of the dot in the sectional view is a _11, a _12, ─────a
It can be represented by _1i, ────a _1n . This section a _1, a
FIG. 1B shows a principle view of the sectional structure of _i, a _n .

In FIG. 1B, 1 is a protective transparent resin (having a refractive index equivalent to that of a transparent magnetic material), 2 is a transparent magnetic material, and 3 is a partition grid material (having a shielding property against magnetism). There is any), 4 is an arbitrary magnetic substance, 5 is a protective resin, 6 is white particles (liquid), and 7 is black magnetic ink. The materials 1 and 2 have the same refractive index to prevent light interference, and the materials 6 and 7 have the same specific gravity in this method. Even if 6 and 7 are mixed, they are materials that do not dissolve each other and naturally do not cause a chemical reaction.

[0012]

FIG. 2 shows an explanatory diagram of the operating principle of the present invention. Figure 1
The operation state in the principle diagram of the structure of the sectional view of (b) will be described. 2 (a) is a black character display, FIG. 2 (b)
Shows the case of displaying characters in white. In the figure, 2 is a transparent magnetic material, 4 is an arbitrary magnetic material, 6 is white particles (liquid), and 7 is black magnetic ink.

In FIG. 2A, the magnetization of the transparent magnetic body 2 is controlled in units of sections a _i . At the same time, the section a _i of the arbitrary magnetic body 4 is demagnetized. Then, the black magnetic ink 7 is pulled by the transparent magnetic body 2 and comes into contact with the transparent magnetic body 2. The state is preserved until the transparent magnetic body 2 is demagnetized. When viewed from above the transparent surface, the black magnetic ink 7 is visible in the section a _i . By controlling the magnetization of the section a _i of the transparent magnetic body 2 in dot units, an arbitrary black character can be displayed.

[0014] In FIG. 2 (b), the magnetization of the compartments a _i of any of the magnetic body 4, to demagnetize the transparent sections a _i of the magnetic body 2.
Then, the black magnetic ink 7 is pulled by the arbitrary magnetic body 4 and comes into contact with the arbitrary magnetic body 4. The state is stored until the arbitrary magnetic body 4 is demagnetized. When viewed from above the transparent surface, the color of the white particles (liquid) 6 can be seen in the section a _i . An arbitrary white character can be displayed by controlling the magnetization of the section a _i of the transparent magnetic body 2 in dot units.

Regarding the magnetization of the magnetic substance in the unit of division, when the magnetic substance is a ferromagnetic substance, when a magnetic field is applied to the unit of division, there is residual magnetism even if the magnetic field is removed, and an attractive force attracting the magnetic ink is generated. , The ferromagnetic material is M _n B _i or T _b F
The thin film of _e exhibits magnetization perpendicular to the plate surface and the attractive force becomes strong. It is considered that this increases the display speed.

To demagnetize the section of the magnetic material, a magnetic field may be applied in the opposite direction to the above. Therefore, as a characteristic of the magnetic material, it is desirable that the magnetization direction is the cross-sectional direction and the remanence is large. The larger the holding force, the less likely it is to be affected by the external magnetic field. The magnetization direction of the magnetic field of the present invention is shown in FIG.
(A) shows the relationship between the hysteresis curve of the magnetic material and (b) the attractive force in the section. In the figure, H is the applied magnetic field, B
Indicates the residual magnetic flux density.

[0017]

FIG. 4 is a sectional view of a display device according to another embodiment of the present invention.
Shown in. FIG. 4A shows a device cross-sectional structural view, and FIG. 4B shows an operation diagram of the device cross-section. In the figure, 11 is a transparent protective resin, 13 is a partition grid material (having a magnetic shielding property), 14 is any magnetic material, 15 is a protective resin, 16 is white particles (liquid), 17 Indicates black magnetic ink. The specific gravity of 16 should be greater than that of 17. Even if 16 and 17 are mixed, they are materials that do not dissolve each other, and naturally do not cause a chemical reaction.

In FIG. 4B, when viewed from the transparent surface, the color of the black magnetic ink is always visible in the section a _i due to the difference in specific gravity between 16 and 17. However, it is assumed that the transparent surface is almost perpendicular to gravity (above figure). Arbitrary section a _i of magnetic material 14
When magnetized, the black magnetic ink 17 is pulled by the arbitrary magnetic body 14 and comes into contact with the arbitrary magnetic body 14. Any magnetic substance 14
The state is maintained until is demagnetized. When viewed from above the transparent surface, white particles (transparent) 16 can be seen in the section a _i . An arbitrary character can be displayed in white by controlling the magnetization of an arbitrary section a _i of the magnetic substance 14 in dot units (the figure below). This embodiment has an effect that the device structure and control can be simplified.

As a necessary material, a transparent magnetic material is, for example, YIG (Y ₃ Fe ₅ O ₁₂ , Y represents yttrium), a B ₁ -converted rare earth-iron garnet string (G _d2 B _i).
F _e5 O _12, etc., where B _i represents visima). Various types of magnetic ink have already been put into practical use, and various patents have been issued for display devices and the like, and they are known. A white resin or the like is used as the partition grid material, and any magnetic material used in various floppy disks or the like can be used.

As for the processing technique, the processing on the lattice can utilize the semiconductor manufacturing process (fine processing technique), and the magnetization and demagnetization of the magnetic substance can be utilized by modifying the floppy disk device for the present invention. ..

FIG. 5 shows an application example of the display system of the present invention.
5A shows an example of using as a substitute for paper, FIG. 5B shows an example of using as a content display of an FD (floppy disk), and FIG. 5C shows an example of using as an OHP. Figure 5
In the case of (a), a pen-type magnetic control device can be used as a writing implement. In the case of FIG. 5B, the display magnetic control device is incorporated in the same place as the FD (3.5 inch) drive, so that the display contents can be rewritten when the contents of the FD are rewritten. In the case of FIG. 5C, the magnetic panel on the back side can be moved up and down by the control device to display a screen on the display panel.

[0022]

According to the present invention, since electricity or heat is not used to maintain the display of arbitrary characters or images, environmental problems such as heat generation and energy consumption can be prevented. Also,
Since the display / erasure is performed by controlling the magnetism, the display device can be used semipermanently, and resources can be effectively used.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is an explanatory diagram of the operation principle of the present invention.

FIG. 3 is a magnetization direction of a magnetic field of the present invention.

FIG. 4 is a sectional view of a display device according to another embodiment.

FIG. 5 is an application example of the display system of the present invention.

[Explanation of symbols]

 1,11 Protective transparent resin 2 Transparent magnetic material 3,13 Partition grid material 4,14 Optional magnetic material 5,15 Protective resin 6,16 White particles 7,17 Black magnetic ink

Claims (2)

[Claims] 1. A structure of a cross-sectional view of a display device for displaying characters, images, etc. by controlling color change in dot units, wherein a transparent magnetic body (2) and a transparent magnetic body (2) are provided on the surface. In order to prevent light interference, it is covered with a protective transparent resin (1) having an equal refractive index, and has a shielding property against magnetism. A partition grid material (3), an optional magnetic material (4) and a protective resin ( In each of the sections surrounded by the bottom plate composed of 5), liquid white particles (6) and black magnetic ink (7) having the same specific gravity are enclosed in a display material, and the liquid white particles are contained. Even if the (6) and the black ink (7) are mixed, they are materials that do not dissolve each other and cause no chemical reaction, and are transparent magnetic bodies (2) in dot units.
Alternatively, a display method using a magnetic ink, wherein an arbitrary black or white character is displayed by controlling the magnetization of a section of an arbitrary magnetic body (4). 2. In the above structure, the surface is covered only with a protective transparent resin, the specific gravity of the liquid white particles is made larger than that of the black ink, and even if they are mixed, they do not melt each other and As a material that does not cause a chemical reaction, black ink is always visible on the surface due to the difference in specific gravity in a state that is nearly perpendicular to the transparent surface, and it is possible to control the magnetization of any section of the magnetic material in dot units. The display method using the magnetic ink according to claim 1, wherein the characters are displayed in white.