JP3011262B2 - Magnetophoretic display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetophoretic display device.

[0002]

2. Description of the Related Art Conventionally, a magnetophoretic display panel in which a multi-cell structure is provided between two substrates, and a dispersion liquid comprising magnetic particles, a dispersion medium, a colorant and, if desired, a thickener is sealed in the cell. JP-B-57-27463, JP-B-59-3171
0) is known. In this magnetophoretic display panel, when recording is performed with a magnetic pen from the front substrate, the magnetic particles in the cell attracted by the magnetic force of the magnetic pen migrate to the vicinity of the inner surface of the front substrate to form another dispersion liquid (for example, white). The display is formed based on the contrast difference between the color and the magnetic particles (for example, black).

The multi-cell structure of this display panel is as follows:
For example, upper and lower end surfaces of a multi-cell plate (for example, a honeycomb plate) having only standing pieces are vertically applied to two substrates as upper and lower openings as upper and lower openings, and are fixed by an adhesive to form an independent multi-cell structure. The dispersion liquid was sealed in each cell.
This eliminates the uneven distribution of the magnetic particles, allows the magnetic particles to be uniformly dispersed over the entire panel, and enables uniform spacing between the substrates, so that stable writing has been obtained. .

[0004]

However, by eliminating the uneven distribution of the magnetic particles as described above, the magnetic particles can be uniformly dispersed over the entire surface of the panel, the distance between the substrates can be uniform, and a stable writing can be obtained. The panel using the multi-cell board of the above is based on the adhesion of both substrates and the multi-cell board, which can be said to be linear at the upper and lower end surfaces of the thin multi-cell board, so the adhesive strength must be weakened, and as a toy for children In the case of this frequently used panel, there was a risk that the adhesive might be peeled off depending on the handling. Therefore, there is a possibility that the dispersion liquid in each cell moves to an adjacent cell and becomes turbid, causing a deterioration in display properties, or the strength of the panel itself is weak due to a linear adhesive surface, and the panel itself may be damaged.

Also, since the end face of the multi-cell board is almost perpendicular to the transparent or translucent substrate, the end face looks thin from the outside of the substrate, and the portion does not contain the dispersion liquid, so that the display is slightly reduced. It was interrupted and I could not draw a complete continuous line. Further, in such a device using a multi-cell plate, since the dispersion liquid is injected only once from one side, multi-color display is practically impossible due to the possibility of color mixing.

The present invention solves these drawbacks and maintains the same quality as a panel using a multi-cell plate with upper and lower openings, even if the bonding strength and the strength of the panel itself are increased. It is an object of the present invention to provide a magnetophoretic display device in which the end surface looks like a single white plate without being seen from the outside of the substrate, and the display is not interrupted and a substantially perfect continuous line can be drawn. Another object of the present invention is to provide a magnetophoretic display device capable of displaying two or more colors without color mixing.

[0007]

The present invention provides a magnetophoretic display panel having a multi-cell structure between two substrates, in which magnetic particles, a dispersion medium, a colorant, and, if desired, a thickening. In a magnetophoretic display device comprising a panel filled with a dispersion liquid comprising an agent and a magnetic means, the multi-cell structure is configured such that the separator is formed into a concave and convex shape so that a concave portion on one side and a concave portion on the other side are alternately or one-sidedly formed. The bottom surface of each concave portion on one surface side and the other surface side is fixed with two substrates, and the opening of each concave portion is closed and the dispersion liquid is sealed therein. The object of the present invention has been solved by a configuration in which a magnetic field is applied to move the magnetic particles in the dispersion liquid near the opening of the concave portion opened on one surface side and near the inner surface of the concave bottom opened on the other surface side.

In the present invention, the magnetic particles and the colorant in the dispersion liquid are different in color when the magnetic particles and the colorant are sealed in a cell having a concave portion on one surface and in a cell having a concave portion on the other surface. It is possible to display two or more colors. Further, it is possible to form the cell composed of the concave part on the one surface side and the cell composed of the concave part on the other side alternately and continuously with the concave and convex, or to form each concave part for forming the cell. The above problem can be more preferably solved by forming the peripheral edge of the bottom surface in an arc shape or an inclined shape.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A panel according to the present invention is characterized in that the dispersion liquid is poured into a concave portion on one surface side of a separator which has been irregularly formed by vacuum molding or injection molding or the like, and a single substrate is placed over the opening thereof and on the same surface. An adhesive is fixed to the outer surface of the bottom of the recess on the other surface on the opposite side. Then, one of the separators with the substrate is inverted and the dispersion liquid is injected into the concave portion on the other surface side, and the other substrate is placed over the opening, and the bottom outer surface of the concave portion on the same side in the opposite direction is placed on the same surface. By fixing with an adhesive, it is possible to form a multi-cell structure in which the dispersion liquid is sealed in cells having concave portions on both sides.

In the panel thus formed, the two substrates are brought into contact with and bonded to each other not to the end surfaces of the cell plate but to the outer surfaces of the bottoms of the recesses of the separator plate. And the strength of the panel itself increases. In addition, since the separator is continuous with irregularities, the bottom edge of the concave portion is slightly arcuate or inclined as shown in FIG. 2, so that a gap is formed between the substrate and the bottom edge and enters there. When the dispersion liquid is seen from the outside of the transparent or translucent substrate, it appears as a double with the dispersion liquid in the adjacent cell, so that the separator cannot be seen from the outside of the substrate and becomes a single white board, and the display is interrupted. And display of continuous lines is also possible.

When magnetic means such as a magnetic pen is brought into contact with the substrate on the front side of the panel, the magnetic force causes the magnetic particles in the dispersion liquid in each cell to open near the opening of the concave portion opened on the front side and open on the back side. It is sucked and moved to the vicinity of the inner surface of the bottom of the concave portion, and display can be performed by a difference in color contrast between another dispersion liquid (for example, white) and magnetic particles (for example, black). Is equivalent to

Further, a dispersion liquid (for example, red A and black B, and other dispersion liquids both white) are mixed with magnetic particles, each having a different color, in a cell composed of concave portions opened in opposite directions. When the magnetic means for enclosing and writing a book is acted on, a two-color mottled pattern of red (A) and black (B) can be displayed on a white background as shown in FIG. In addition, when a bold magnetic means that simultaneously includes several cells is actuated, the two-color mottled pattern of red (A) and black (B) and the checkered pattern are displayed in the bold display as shown by the chain line in FIG. A bold display such as a pattern is obtained. The colorants in the dispersion liquid are red (A) and white (B)
If the cell shape is square, the pattern becomes a checkered pattern of red (A) and white (B) as shown in FIG. 4, and if the cell is rectangular, the pattern is an oblique pattern (FIG. 4). If it is hexagonal, it becomes a continuous pattern pattern where one color surrounds another color as shown in FIG. 5, and a black means can be displayed by applying magnetic means thereon. Further, as shown in FIG. 6, the liquid A is sealed and the substrate is fixed (FIG. 6A). Then, another molding is performed from the same direction and the liquid C is sealed to fix the other substrate (FIG. 6A). (B)), and further, the liquid B is sealed in the cell having the reverse opening and the other substrate is fixed (FIG. (C)).
BC) and above.

As the magnetic particles used in the present invention, oxide magnetic materials such as magnetite, γ-hematite, chromium dioxide, ferrite, and alloy-based metal magnetic materials such as cobalt and nickel can be used. Coated color magnetic particles can also be used. The dispersion medium may be any of a polar dispersion medium such as water and glycols, and a non-polar dispersion medium such as an organic solvent and an oil.The colorant is used to provide hiding power and color to the dispersion liquid. And a white pigment, other dyes or pigments can be used.

The substrate on the display side is desirably transparent. Depending on the application, a translucent substrate can be used. Various types of plastics and glass are used. The substrate on the non-display side is not always transparent, Plastics, glass, and metal are used. In the case of double-sided display, it is desirable that both substrates are transparent. The shielding plate is made of transparent PVC resin, P
ET resin, ABS resin, etc. are used, and irregularities are formed by vacuum forming, injection molding, press working, etc., in such a way that concave portions having substantially the same depth are alternately reversed, and irregularities may be alternately alternated one by one. Alternatively, two standing portions may be overlapped to form two or more concave portions. As described above, the planar shape of the concave portion is a polygon such as a square, a rectangle, or a hexagon, or a round shape, with one opening at the rising portion and the bottom portion.

Examples of the magnetic means include a magnetic pen made of a permanent magnet or an electromagnet, a magnetic head, a printing tool provided with figures and characters on its surface, a magnetic sheet, or a dot matrix magnetic head.

[0016]

Embodiments of the present invention will be described below. Example 1 97 parts by weight of an isoparaffin solvent, 2 parts by weight of finely divided silica,
And 1 part by weight of titanium oxide to obtain a white liquid.
Todakara-KN-320 (magnetite manufactured by Toda Kogyo)
90 parts and 25 parts of a 40% methyl ethyl ketone solution of Epototo YD-017 (solid epoxy resin manufactured by Toto Kasei Co., Ltd.) are kneaded, dried, pulverized and separated to form black magnetic particles 40 to 325 mesh. Got a part. The magnetic particles were mixed with the white liquid to obtain a dispersion liquid 1. The yield value of this dispersion 1 was measured by a direct method using a B-type viscometer.
ne / cm ² .

A concave sheet 2 having a depth of 1.2 mm and a depth of 1.2 mm as shown in FIGS. The separators 4 were alternately repeated in the direction and continuously formed. This separator 4
The dispersion liquid 1 is put into the concave portion 2 of the front side opening, and the surface substrate 5 made of a plastic film having a thickness of 0.15 mm is brought into contact therewith to cover the concave portion 2 of the front side opening. The dispersion liquid 1 was sealed in a cell 7 which was adhered and formed of the concave portion 2 in the front opening. The dispersion liquid 1 was sealed in the cell 7. The thickness of the PVC sheet is 0.05 to 0.1 mm,
One side is 3.4 to 4.0 mm, depth is 1.0 to 1.3 mm, and surface board 5
Can be used in a thickness of 0.1 to 0.15 mm, and the vacuum forming may be injection molding, press working or the like.

Next, the separating plate 4 with the front substrate 5 is inverted, and the dispersion liquid 1 is put into the concave portion 2 of the rear opening, and the same rear substrate 8 as the front substrate 5 is brought into contact with the concave portion 2 of the rear opening. At the same time, the dispersion liquid 1 was sealed in a cell 9 comprising the concave portion 2 of the back side opening by bonding to the bottom outer surface 6 of the concave portion 2 of the front side opening with an epoxy adhesive. Thus, a magnetic display panel was manufactured by forming a multi-cell structure in which the dispersion liquid 1 was sealed in the cells 7 and 9 on both sides. Note that the substrates 5, 8 and the separator 4 may be bonded by hot melt bonding, in which case the transparency is further improved.

In this panel, the end face of the separator plate 4 (multi-cell plate) is not seen and it looks like a single white board as compared with the conventional panel using a multi-cell plate. pen
When the recording was performed at 11, a clear display with high contrast without discontinuity of display was obtained at the standing piece portion of the separator 4. This display did not disappear even after one month, and there was no peeling of the adhesive or the panel being damaged by the impact force applied by the infant.

Separator plate 4 and cells 7 and 9 are similarly formed by injection molding the above-mentioned PVC sheet, and dispersion liquid 1 is similarly formed.
To make a magnetic display panel. This panel also provided a display of the same quality as the magnetic display panel described above.

Example 2 A dispersion liquid 1 (B) containing the mixture of black magnetic particles of Example 1 was sealed in a cell 7 comprising a concave portion 2 having an opening on the front side, and the above-described magnetic particles were coated with a red colored layer. The dispersion liquid 1 (A) obtained by mixing the particles with the white dispersion liquid of Example 1 was sealed in a cell 9 comprising the concave portion 2 in the back side opening to produce a magnetic display panel. When recording was performed on this panel with a finely-written magnetic pen 11 provided with a permanent magnet 10, a line display with a mottled pattern of red (A) and black (B) was obtained on a white background as shown in FIG. When recording with a bold magnetic pen (not shown),
As shown by the chain line in FIG. 4, a checkered pattern alternately vertically and horizontally in red (A) and black (B) is drawn without color mixing in a thick line, and the other operations are the same as in the first embodiment.

Example 3 A dispersion liquid 1 containing a mixture of white liquid of Example 1 was sealed in a cell 7 comprising a concave portion 2 having a front opening in Example 1, and a red pigment was added to the white liquid to form a color. The liquid was sealed in the cell 9 comprising the concave portion 2 of the back side opening in Example 1 to produce a magnetic display panel. This panel has a checkered pattern in which white and red squares are alternately arranged vertically and horizontally as shown in FIG. 4, and when recorded by a magnetic pen 11 provided with a permanent magnet 10, the checkerboard pattern is obtained. −
Black writing lines of the same quality as in Example 1 were obtained on the ground.

EXAMPLE 4 A separator 4 'is formed as a flat hexagonal recess 2' having a facing length of 3.5 mm and a depth of 1.2 mm as shown in FIG. A cell having an opening on the back side is adjacent to the object, and the recesses 2 'on the back side opening are provided continuously by stacking upstanding pieces. A display panel was manufactured by enclosing the dispersion liquid 1 (B) containing the colorant and the dispersion liquid 1 (A) containing the white colorant in a cell 9 ′ including a concave portion 2 ′ on the back side opening. In this panel, as shown in FIG. 5, a continuous pattern pattern surrounding one red color and six white colors was obtained, on which a writing line was drawn with a magnetic pen. Other operations were the same as in Example 3. The recess 2 'may be a hexagon having a facing length of 3.5 to 4.5 mm and a depth of 1.0 to 1.3 mm.

Embodiment 5 As shown in FIG. 6 (a), as shown in FIG. 6 (a), the separators 4 are provided with the recesses 2 of the front opening and the recesses 2 of the back opening having a length three times as long as the above by vacuum forming. The dispersion liquid 1 (A) containing the mixed red magnetic particles is put into the concave portion 2 of the front opening, a substrate 12 made of a plastic film having a thickness of 0.05 mm is brought into contact with the liquid, and adhered to the bottom outer surface 6 of the concave portion 2 of the rear opening with an adhesive. The dispersion liquid 1 (A) is sealed in the cell 7 formed by the concave portion 2 in the front opening. Next, as shown in FIG. 6 (b), the central portion of the concave portion 2 of the back side opening is formed to be approximately the same size as the concave portion 2 of the front side opening together with the substrate 12 by the above-mentioned vacuum forming. The dispersion liquid 1 (C) is put, and a substrate 5 made of a plastic film having a thickness of 0.15 mm is brought into contact with the dispersion liquid 1 (C). 1 (C) is enclosed. After that, the separator 4 is turned over and the dispersion liquid 1 (B) containing the black magnetic particles is put in the concave portion 2 of the back side opening.
And a liquid crystal 1 (A) was sealed in the cell 9 to form a display panel. When this panel was recorded with the magnetic pen 11, three-color mottled patterns could be displayed and were drawn without color mixing. The substrate 12 has a thickness of 0.03 to 0.05 mm, the substrate 5 has a thickness of 0.1 to 0.15 mm,
The back substrate 8 having a thickness of 0.03 to 0.15 mm can be used.

[0025]

According to the present invention, even if the bonding strength and the strength of the panel itself are increased, the display performance and the display retention performance can be maintained at the same level as those of the conventional multi-cell plate, and the multi-cell display can be maintained. It was possible to obtain a magnetophoretic display device in which the end surface of the cell plate of the structure could be seen as a single white plate without being seen from the outside of the substrate, and the display was not interrupted and an almost complete continuous line could be drawn. Also,
A display of two or more colors could be obtained without color mixing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a panel according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of FIG.

FIG. 3 is a plan view of a panel according to another embodiment of the present invention.

FIG. 4 is a plan view of a panel according to another embodiment of the present invention.

FIG. 5 is a plan view of a panel according to another embodiment of the present invention, from which a front substrate is removed.

FIG. 6 is an explanatory diagram showing panel creation according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dispersion liquid 2 Recess 3 Opening 4 Separation plate 5, 8, 12 Substrate 6 Bottom outer surface 7, 9, 13 Cell 10 Permanent magnet 11 Magnetic pen

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G09F 9/37

Claims (5)

(57) [Claims] 1. A panel in which a multi-cell structure is provided between two substrates, and a cell in which a dispersion liquid comprising magnetic particles, a dispersion medium, a colorant, and, if desired, a thickener is sealed in the cell, In the magnetophoretic display device comprising the means, the multi-cell structure is configured such that the separator is unevenly formed to form alternately or partially continuous concave portions on one surface side and concave portions on the other surface side, and the one surface side and the other surface side The bottom surface of each concave portion is fixed with two substrates, and the opening of each concave portion is closed and the dispersion liquid is sealed. The magnetic particles in the dispersion liquid are applied by applying a magnetic field by magnetic means from outside the substrate. A magnetophoretic display device which is moved near a concave opening on one surface side and near a concave inner surface on the other surface side. 2. The method according to claim 1, wherein the magnetic particles in the dispersion liquid are different in color when they are sealed in a cell having a concave portion on one side and in a cell having a concave portion on the other side. The magnetophoretic display device according to claim 1, wherein 3. The colorant in the dispersion liquid is different in color between a cell enclosed in a cell having a concave portion on one side and a cell enclosed in a cell having a concave portion on the other side. The magnetophoretic display device according to claim 1, wherein: 4. The cell according to claim 1, wherein the cells formed of the concave portions on the one surface side and the cells formed of the concave portions on the other surface side are formed with the concave and convex portions alternately and continuously. Magnetophoretic display device. 5. The magnetophoresis device according to claim 1, wherein the separator has a bottom edge of each concave portion forming a cell formed in an arc shape or an inclined shape. Display device.