Film-type magnetic board, driving method thereof, and manufacturing method thereof

Abstract

The present invention relates to a film-type magnetic board. The magnetic board may comprise: a driving layer including magnetophoretic particles dispersed in a fluid; an upper film layer positioned on the upper surface of the driving layer; a lower film layer positioned on the lower surface of the driving layer; and a lower magnetic layer positioned on the lower surface of the lower film layer and at least partially magnetized by one end of a magnetic body adjacent to the upper film layer, so as to be maintained as a magnetic region, thereby aggregating the magnetophoretic particles.

Description

Film-type magnetic board, driving method thereof, and manufacturing method thereof

[0001] The present invention relates to a film-type magnetic board, and more particularly, to a film-type magnetic board, a driving method thereof, and a manufacturing method thereof.

[0002] Magnetic boards using magnetic fields are widely used in toys for infants and children due to their usefulness, such as being colorless and dustless. As an example of the prior art, a method has been introduced in which magnetic particles are dispersed in a colored fluid, the particles are filled into a structure having a partition structure, and then a magnetic field is locally applied using a magnetic pen or the like from the upper part of the structure to move the magnetic particles and display predetermined information, or an opposite magnetic field is applied using a movable magnetic plate or the like from the lower part of the structure to completely erase the information displayed by the magnetic particles.

[0003] However, conventional technology has suffered from problems such as the spacing between the baffle structures being on the order of millimeters and the size of the iron particles being large, resulting in low resolution of the information displayed. Furthermore, the complex structure of the display device hinders the production of thin and flexible display devices, and prevents large-scale manufacturing.

[0004] Meanwhile, due to recent environmental issues, there is a persistent market demand for eco-friendly alternatives that can eliminate the need for whiteboard consumables. Furthermore, research is needed on manufacturing methods for thin, large-area magnetic boards.

[0005] The present invention aims to solve various problems, including those described above, by providing a film-type magnetic board capable of being manufactured on a large area in the form of a thin and flexible film with high resolution, as well as a method for operating the same and a method for manufacturing the same. However, these tasks are exemplary and the scope of the present invention is not limited thereby.

[0006] According to one aspect of the present invention for solving the above problem, a film-type magnetic board capable of displaying information using magnetism comprises: a driving layer including magnetophoretic particles dispersed in a fluid; an upper film layer positioned on an upper surface of the driving layer; a lower film layer positioned on a lower surface of the driving layer; and a lower magnetic layer positioned on a lower surface of the lower film layer, wherein the magnetophoretic particles are aggregated into a magnetized region of the lower magnetic layer by a magnetic body positioned on the upper film layer, thereby displaying information, and the magnetophoretic particles aggregated into the magnetized region of the lower magnetic layer are dispersed, thereby removing information.

[0007] According to one embodiment of the present invention, in the driving layer, the fluid and the magnetophoretic particles can be encapsulated.

[0008] According to one embodiment of the present invention, the magnetophoretic particle includes a superparamagnetic particle, the magnetophoretic particle includes a material of MaXb, wherein M may be any one of Cr, Ni, Ti, Zr, Fe, Co, Zn, Gd, Ta, Nb, Pt, Au, Mg, Mn, Pd, Sr, Ag, Ba, Cu, W, Mo, Sn and Pb, wherein X may be any one of F, Cl, Br, I and 0, wherein a may be greater than 0 and less than 5, and wherein b may be greater than 0 and less than 5.

[0009] According to one embodiment of the present invention, the magnetophoretic particles may include first magnetophoretic particles and second magnetophoretic particles having different magnetization values.

[0010] According to one embodiment of the present invention, the fluid may include at least one of water, methanol, ethanol, propanol, butanol, propylene carbonate, toluene, benzene, hexane, and isoparaffin oil.

[0011] According to one embodiment of the present invention, the driving layer includes a plurality of capsules, and the film material of the capsule walls forming the plurality of capsules is a transparent material, and the film material of the capsule walls may include at least one of aginate, gelatin, gum, ethyl cellulose, polyamide, polyvinyl alcohol, alginate, melamine formaldehyde, poly(vinyl pyridine), polystyrene, urethane, polyurethane, urea, polyurea, and methyl methacrylate.

[0012] According to one embodiment of the present invention, the upper film layer and the lower film layer may be any one selected from the group consisting of polyester (PET), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polycarbonate (PC), polypropylene (PP), and acrylic film.

[0013] According to one embodiment of the present invention, the magnetic body may include any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium.

[0014] According to one embodiment of the present invention, the lower magnetic layer may include a metal compound.

[0015] According to one embodiment of the present invention, the lower magnetic layer may include any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium.

[0016] According to one embodiment of the present invention, the magnetic board can display information or selectively remove displayed information depending on the magnetic strength of the magnetic body.

[0017] According to one embodiment of the present invention, when a part of the lower magnetic layer is magnetized into a magnetic region by the magnetic body, information displayed by the driving layer can be permanently maintained even if the magnetic body is removed.

[0018] Another aspect of the present invention for solving the above problem is a driving method of a film-type magnetic board, comprising: a driving layer including magnetophoretic particles dispersed in a fluid; an upper film layer positioned on an upper surface of the driving layer; a lower film layer positioned on a lower surface of the driving layer; and a lower magnetic layer positioned on a lower surface of the lower film layer, wherein information is displayed by causing the magnetophoretic particles to aggregate into a magnetized region of the lower magnetic layer by a magnetic body positioned on the upper film layer, and information is removed by causing the magnetophoretic particles aggregated into the magnetized region of the lower magnetic layer to disperse.

[0019] According to one embodiment of the present invention, the magnetophoretic particles may include first magnetophoretic particles and second magnetophoretic particles having different magnetization values.

[0020] According to one embodiment of the present invention, the magnetic board can display information or selectively remove displayed information depending on the magnetic strength of the magnetic body.

[0021] According to one embodiment of the present invention, when a part of the lower magnetic layer is magnetized into a magnetic region by the magnetic body, information displayed by the driving layer can be permanently maintained even if the magnetic body is removed.

[0022] According to one embodiment of the present invention, the magnetic board can control at least a portion of the lower magnetic layer to be magnetized and information to be displayed by the driving layer when the magnetism of the magnetic body is 100 Gauss to 3000 Gauss.

[0023] According to one embodiment of the present invention, the magnetic board can be controlled to erase a region where at least a portion of the lower magnetic layer is magnetized when the magnetism of the magnetic body is 2000 to 6000 Gauss, thereby removing information displayed by the driving layer.

[0024] A method for manufacturing a film-type magnetic board according to another aspect of the present invention for solving the above problem is a method for manufacturing a film-type magnetic board using a roll-to-roll process, comprising: forming a lower film layer on a lower magnetic layer in which at least a portion is magnetized and maintained as a magnetic region depending on the position of a magnetic body; forming a drive layer including magnetophoretic particles dispersed in a fluid on the lower film layer; and forming an upper film layer on the drive layer.

[0025] According to the method for manufacturing a film-type magnetic board according to one embodiment of the present invention, which is achieved as described above, a film-type magnetic board with high resolution, thinness, and flexibility that can be manufactured on a large area can be realized. Using a magnetic material on such a film-type magnetic board, display information can be easily displayed or erased. Of course, the scope of the present invention is not limited by these effects.

[0026] FIG. 1 is a schematic cross-sectional view showing a film-type magnetic board according to one embodiment of the present invention.

[0027] Figures 2 and 3 are cross-sectional views schematically illustrating a process of displaying information using a first magnetic body (50) on the film-type magnetic board illustrated in Figure 1.

[0028] Fig. 4 is a cross-sectional view schematically illustrating a process of removing information displayed on a film-type magnetic board illustrated in Fig. 1 using a first magnetic body (50).

[0029] FIGS. 5 to 8 are photographs showing a process of displaying and removing information on a film-type magnetic board according to one embodiment of the present invention.

[0030] FIG. 9 is a schematic cross-sectional view showing a film-type magnetic board according to another embodiment of the present invention.

[0031] FIG. 10 and FIG. 11 are cross-sectional views schematically illustrating a process of displaying information using a first-first magnetic body (52) and a first-second magnetic body (54) on a film-type magnetic board illustrated in FIG. 9.

[0032] Figure 12 is a photograph showing the types of colored solutions used in the present invention.

[0033] Figure 13 is a photograph showing the difference in color according to the size (100 nm (a), 150 nm (b), 200 nm (c), 500 nm (d), 1000 nm (e)) of the magnetophoretic particles used in the present invention.

[0034] Figure 14 is a photograph showing the difference in color according to the drying method (hot air drying (a), freeze drying (b)) of the magnetic particles used in the present invention.

[0035] Figure 15 is a photograph showing the difference in color according to the surface coating of the magnetophoretic particles used in the present invention.

[0036] Figure 16 is a photograph showing the difference in color obtained by combining the colored solutions and magnetic particles shown in Figures 12 to 15.

[0037] Fig. 17 is a photograph showing the difference in color of information displayed on a magnetic board depending on the color of the magnetophoretic particles according to an experimental example of the present invention.

[0038] Figure 18 is a photograph showing the difference in information displayed on a magnetic board depending on the color of the colored solution according to an experimental example of the present invention.

[0039] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0040] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various other forms, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and to fully convey the spirit of the present invention to those skilled in the art. In addition, the thickness and size of each layer in the drawings are exaggerated for convenience and clarity of explanation.

[0041] Hereinafter, embodiments of the present invention will be described with reference to drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations in the shapes depicted may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as limited to the specific shapes of the regions depicted herein, but should include, for example, variations in shapes resulting from manufacturing processes.

[0042] FIG. 1 is a schematic cross-sectional view showing a film-type magnetic board according to one embodiment of the present invention.

[0043] Referring to FIG. 1, a film-type magnetic board (100) according to one embodiment of the present invention includes a lower magnetic layer (10), a lower film layer (20), a driving layer (30), and an upper film layer (40) so as to display or remove information using magnetism.

[0044] Specifically, the film-type magnetic board (100) includes a driving layer (30) including magnetophoretic particles (35) dispersed in a fluid (34). The driving layer (30) includes a plurality of capsules (32) in which the aforementioned fluid (34) and magnetophoretic particles (35) are encapsulated by a capsule wall (36).

[0045] As an example, the magnetophoretic particle (35) may be a superparamagnetic particle. The size of the magnetophoretic particle (35) may be 100 nm to 5000 nm, preferably 100 nm to 1000 nm. The magnetophoretic particle (35) may be M a X b The magnetophoretic particle may have a magnetization value of 30 emu / g to 100 emu / g, and preferably, a magnetization value of 40 emu / g to 70 emu / g.

[0046] M a X b In , M can be any one of Cr, Ni, Ti, Zr, Fe, Co, Zn, Gd, Ta, Nb, Pt, Au, Mg, Mn, Pd, Sr, Ag, Ba, Cu, W, Mo, Sn and Pb, X can be any one of F, Cl, Br, I and 0, a can be greater than 0 and less than 5, and b can be greater than 0 and less than 5.

[0047] The magnetically conductive particles (35) can have various colors depending on their size and degree of surface oxidation.

[0048] As an example, the color of the particles can be manufactured in various ways depending on the size of the magnetophoretic particles (35). As described above, the size of the magnetophoretic particles (35) can be variously controlled within the range of 100 nm to 5000 nm. In fact, as the size of the particles increases to 100 nm (a), 150 nm (b), and 200 nm (c), the color gradually changes from a dark color to a light color, as shown in Fig. 13. As the size of the particles increases further to 500 nm (d) and 1000 nm (e), the color darkens again, but it can be confirmed that it has a different color from when the particle size is small.

[0049] As another example, the magnetic particles (35) can be manufactured to have various colors by controlling the oxidation of the magnetic particles (35) depending on the drying method after synthesis. The drying method may broadly include a freeze-drying method or a hot air drying method, and depending on the drying method as described above, different colors can be implemented even when the same magnetic particles are used, as illustrated in FIG. 14. For example, the color of the magnetic particles in the case of hot air drying (a) can be implemented as a brighter and more cheerful color than the color of the magnetic particles in the case of freeze-drying (b).

[0050] As another example, magnetophoretic particles (35) of various colors can be implemented depending on the dye or pigment coated on the surface of the magnetic particles. Since the color of the coated dye or pigment is directly displayed, the dye or pigment must be selected according to the type of information to be expressed and coated on the surface of the magnetic particles before manufacturing the magnetic board. Referring to Fig. 15, magnetophoretic particles (35) expressed in various colors, from left to right, red, blue, white, and yellow, depending on the dye or pigment, can be confirmed.

[0051] The fluid (34) may be a transparent solution or a colored solution, and may include a colored solution formed by dissolving a dye in a solvent or a solution formed by dispersing a pigment in a transparent solution. For example, when red, green, blue, and yellow dyes are appropriately mixed in a transparent solution, various color combinations are possible, as illustrated in FIG. 12.

[0052] The fluid (34) may have a viscosity of 1 cp to 300 cp, preferably 1 cp to 100 cp.

[0053] The fluid (34) may include at least one of water, methanol, ethanol, propanol, butanol, propylene carbonate, toluene, benzene, hexane, and isoparaffin oil.

[0054] Depending on the color combination of the magnetic particles (35) and fluid (34) described above, the background color and the color of the displayed information can be varied, as illustrated in FIG. 16. FIG. 16 (a) shows information displayed using red particles in a yellow fluid, FIG. 16 (b) shows information displayed using yellow particles in a transparent fluid, FIG. 16 (c) shows information displayed using orange particles in a transparent fluid, FIG. 16 (d) shows information displayed using blue particles in a transparent fluid, and FIG. 16 (e) shows information displayed using red particles in a transparent fluid. In addition, various forms of background colors and colors of information can be appropriately implemented.

[0055] For example, when a transparent solution is used as a fluid (34) and the degree of oxidation is controlled or the size of the particles is controlled differently when synthesizing magnetic particles as magnetophoretic particles (35), as can be seen in Fig. 17, it can be expressed by a magnetic board in a form with controlled brightness, such as black (a), dark brown (b), and yellowish brown (c).

[0056] If a specific magnetically conductive particle (35) is used and the pigment is dispersed in a transparent solution, as can be seen in Fig. 18, the color can be expressed in a controlled form, such as black (a), yellow (b), brown (c), and green (d), by the magnetic board.

[0057] The film material of the capsule wall (36) forming the capsule (32) may be a transparent material.

[0058] The film material of the capsule wall (36) may include at least one of Aginate, Gelatin, Gum, Ethyl Cellulose, Polyamide, Polyvinyl Alcohol, Alginate, Melamine Formaldehyde, Poly(vinyl pyridine), Polystyrene, Urethane, Polyurethane, Urea, Polyurea, and Methyl Methacrylate.

[0059] The size of the capsule (32) including the aforementioned fluid (34), magnetically conductive particles (35), and capsule wall (36) may be 5 um to 120 um, and preferably, 10 um to 60 um. The thickness of the driving layer (30) including the capsule (32) may be 10 um to 100 um.

[0060] The upper film layer (40) and the lower film layer (20) may be made of a transparent material, and for example, any one selected from the group consisting of polyester (PET), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polycarbonate (PC), polypropylene (PP), and acrylic film may be used. The thickness of the upper film layer (40) and the lower film layer (20) may be 25 um to 250 um.

[0061] The lower magnetic layer (10) may include a metal compound, for example, any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium. The thickness of the lower magnetic layer (10) may be 0.3 mm to 5 mm.

[0062] This lower magnetic layer (10) can be magnetized according to the position of the first magnetic body (50) adjacent to the upper film layer (40) to display information on the driving layer (30). Magnetization means that at least a part of the lower magnetic layer (10) is changed into a magnetic body due to the magnetism of the first magnetic body (50).

[0063] The first magnetic body (50) is configured separately from the film-type magnetic board (100) and must have a magnetism of a certain level or higher to drive the driving layer (30) through magnetization of the lower magnetic layer (10). For example, it may be 100 to 6000 Gauss. The magnetic strength of the first magnetic body (50) may be applied differently depending on the driving method of the driving layer (30). The first magnetic body (50) may include, for example, any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium.

[0064] The thickness of the film-type magnetic board (100) may be 400 um to 7000 um. The radius of curvature of the film-type magnetic board (100) may be 1000R or less. As described above, the film-type magnetic board (100) can display information or selectively remove the displayed information depending on the magnetic strength of the first magnetic body (50). In the film-type magnetic board (100), when a part of the lower magnetic layer (10) is magnetized into a magnetic region by the first magnetic body (50), even if the first magnetic body (50) is removed, the information displayed by the drive layer (30) can be permanently maintained.

[0065] Below, a method for manufacturing the aforementioned film-type magnetic board (100) will be described.

[0066] For example, a method for manufacturing a film-type magnetic board according to one embodiment of the present invention is formed using a roll-to-roll process.

[0067] First, a step of forming a lower film layer (20) on the prepared lower magnetic layer (10) can be performed. As described above with reference to FIG. 1, at least a portion of the lower magnetic layer (10) can be magnetized and maintained as a magnetic region depending on the position of the magnetic material.

[0068] Afterwards, a step of forming a driving layer (30) including magnetically conductive particles (35) dispersed in a fluid (34) on a lower film layer (20) can be performed. The driving layer (30) is formed into a film by coating and printing on the lower film layer (20), and the film can be formed by a silk screen, gravure, comma coater, slot die, or bar coater during the coating and / or printing.

[0069] The driving layer (30) can be formed in a form in which a plurality of capsules (32) are aligned by encapsulating a fluid (34) and magnetically moving particles (35) dispersed within the fluid (34) and moved by magnetism by a capsule wall (36).

[0070] Finally, a step of forming an upper film layer (40) on the driving layer (30) can be performed. The upper film layer (40) can use the same material as the lower film layer (20). The upper film layer (40) is formed on the upper part of the driving layer (30) and can be formed in a form that covers all the upper surfaces of the plurality of capsules (32). A solution in which a plurality of capsules (32) and a binder are mixed together is coated on the lower film layer (20) and then dried to form the driving layer (30). By attaching an adhesive on the driving layer (30) and laminating the upper film layer (40), a film-type magnetic board (100) in which the upper film layer (40) and the lower film layer (20) are combined can be manufactured.

[0071] Hereinafter, a driving method of a film-type magnetic board (100) according to one embodiment of the present invention will be described with reference to drawings.

[0072] FIG. 2 and FIG. 3 are cross-sectional views schematically illustrating a process of displaying information using a first magnetic body (50) on a film-type magnetic board illustrated in FIG. 1, FIG. 4 is a cross-sectional view schematically illustrating a process of removing information displayed using a first magnetic body (50) on a film-type magnetic board illustrated in FIG. 1, and FIGS. 5 to 8 are photographs showing a process of displaying and removing information on a film-type magnetic board according to one embodiment of the present invention.

[0073] Referring to FIGS. 2 to 8, the driving of the film-type magnetic board (100) according to one embodiment of the present invention can be implemented in the following manner.

[0074] For example, by placing a first magnetic body (50) adjacent to a film-type magnetic board (100) and magnetizing at least a portion of the lower magnetic layer (10), the magnetophoretic particles (35) provided in the drive layer (30) are aggregated at a specific location to display information. Alternatively, by placing a second magnetic body (60) adjacent to the film-type magnetic board (100) and re-magnetizing at least a portion of the magnetized lower magnetic layer (10), the magnetophoretic particles (35) are redispersed within the fluid (34), so that the information is erased.

[0075] Here, the first magnetic body (50) and the second magnetic body (60) may be magnetic pens, and by controlling the magnetic strength of one magnetic pen, information can be displayed when the magnetic strength is relatively low. On the other hand, when the magnetic strength of the magnetic pen is relatively high, the displayed information can be selectively removed.

[0076] For example, the film-type magnetic board can be controlled so that when the magnetism of the first magnetic body (50) is 100 to 3000 Gauss, at least a portion of the lower magnetic layer (10) is magnetized and information is displayed by the driving layer (30). In addition, when the magnetism of the second magnetic body (60) is 2000 to 6000 Gauss, the film-type magnetic board can be controlled so that the area where at least a portion of the lower magnetic layer (10) is magnetized is erased and information displayed by the driving layer (30) is removed.

[0077] Specifically, as illustrated in FIG. 2, at least a portion of the lower magnetic layer (10) can be magnetized and maintained as a magnetic region by one end of the first magnetic body (50) adjacent to the upper film layer (40) so as to aggregate the magnetophoretic particles (35). At this time, the magnetophoretic particles (35) located at the portion where the first magnetic body (50) comes into contact with the upper film layer (40) are aggregated near the magnetized and magnetic region of the lower magnetic layer (10), so that information can be displayed externally.

[0078] For example, when a first magnetic body (50) on a film-type magnetic board (Fig. 5) on which information is not displayed comes into contact with an upper film layer (40) located above an area where a first capsule (32A) is placed, a part of a lower magnetic layer (10) located below the area where the first capsule (32A) is placed may be magnetized into a first region (10A) that is magnetic. At the same time, the magnetophoretic particles (50) provided in the driving layer (30) may be aggregated in the vicinity of the first region (10A) adjacent thereto.

[0079] At this time, even if the first magnetic body (50) is removed, the magnetized first region (10A) of the lower magnetic layer (10) continues to be magnetized, and the aggregation of the magnetophoretic particles (35) provided in the drive layer (30) can be controlled to be continuously maintained. In this way, even if the first magnetic body (50) is separated from the upper film layer (40), the information displayed by the drive layer (30) can be permanently maintained.

[0080] In this manner, as illustrated in FIG. 3, some regions (10A, 10B, 10C) of the lower magnetic layer (10) are magnetized by the first magnetic body (50), so that the magnetophoretic particles (35) can be aggregated and arranged at specific locations in a plurality of capsules (32A, 32B, 32C) arranged in each region. In this manner, information according to the operation of the driving layer (30) can be permanently displayed in a form as illustrated in FIGS. 6 and 7.

[0081] Referring to FIGS. 4 and 8, when a second magnetic body (60) is brought into contact with an area of ​​an upper film layer (40) located on top of a first capsule (32A) located in a first area (10A), the first area (10A) formed in the lower magnetic layer (10) exhibiting magnetism is magnetized back to its original state, and the magnetophoretic particles (35) are redistributed within the first capsule (32A), so that information displayed externally can be removed.

[0082] As described above, when writing or drawing, etc., using a magnetic pen (50) having a predetermined magnetism on the upper film layer (40) of the film-type magnetic board (100) according to one embodiment of the present invention, only a part of the lower magnetic layer (10) corresponding to the magnetic pen (50) is magnetized, so that only that area has magnetic properties, and the magnetophoretic particles (35) of the driving layer (30) are caused to aggregate or arrange only in the magnetized part by the magnetic field, so that information can be displayed. At this time, the state is maintained even if the magnetic pen (50) is removed.

[0083] If a specific ignition part of the lower magnetic layer (10) is removed with a separate magnetic body (60) on a film-type magnetic board (100) in which magnetophoretic particles (35) are aggregated and arranged to display information, the magnetic properties are lost, and the magnetophoretic particles (35) of the driving layer (30) are dispersed again in the fluid (34), causing the information to be erased.

[0084] FIG. 9 is a schematic cross-sectional view showing a film-type magnetic board according to another embodiment of the present invention.

[0085] Referring to FIG. 9, a film-type magnetic board (200) according to another embodiment of the present invention has the same configuration as that shown in FIG. 1, but only the types of magnetomotive particles (35a, 35b) provided in the driving layer (30) are different.

[0086] Specifically, the film-type magnetic board (200) includes a driving layer (30) in which first magnetophoretic particles (35a) and second magnetophoretic particles (35b) are dispersed in a fluid (34). The driving layer (30) includes a plurality of capsules (32) in which the aforementioned fluid (34), first magnetophoretic particles (35a), and second magnetophoretic particles (35b) are encapsulated by a capsule wall (36).

[0087] The first magnetophoretic particle (35a) and the second magnetophoretic particle (35b) may be superparamagnetic particles and may be magnetic particles having different magnetization values. In the drawing, two magnetic particles are shown as examples, but three or more magnetic particles may be mixed and used to display more diverse information depending on the color of the particles or the color of the fluid.

[0088] Hereinafter, a driving method of a film-type magnetic board (200) according to another embodiment of the present invention will be described with reference to drawings.

[0089] FIG. 10 and FIG. 11 are cross-sectional views schematically illustrating a process of displaying information using a first-first magnetic body (52) and a first-second magnetic body (54) on a film-type magnetic board illustrated in FIG. 9.

[0090] Referring to FIGS. 10 and 11, the driving of the film-type magnetic board (200) according to the embodiment of the present invention can be implemented in the following manner.

[0091] For example, in the case where first magnetophoretic particles (35a) and second magnetophoretic particles (35b) having different magnetization values ​​are dispersed in each of a plurality of capsules (32) provided in the driving layer (30), only some of the magnetophoretic particles can be controlled to move depending on the size of the magnetization value of the magnetic body.

[0092] For example, assuming that the first magnetophoretic particle (35a) has a specific magnetization value, the second magnetophoretic particle (35b) may have a relatively higher magnetization value than the first magnetophoretic particle (35a).

[0093] At this time, the 1-1 magnetic body (52) can be placed adjacent to the film-type magnetic board (200) to magnetize at least a portion of the lower magnetic layer (10) (10A).

[0094] As an example, when a 1-1 magnetic body (52) having a relatively weaker magnetization value than the first magnetic body (50) illustrated in FIG. 1 is placed adjacent to the first capsule (32A), only the upper portion of a portion of the lower magnetic layer (10) can be weakly magnetized (10A) based on the thickness direction of the lower magnetic layer (10). When only the upper portion of the lower magnetic layer (10) is weakly magnetized (10A), as illustrated in FIG. 10, the first magnetophoretic particle (35a) having a relatively low magnetization value does not move, and only the second magnetophoretic particle (35b) moves. Accordingly, information is displayed only in the color implemented by the moved second magnetophoretic particle (35b). At this time, the contrast ratio is not significantly affected.

[0095] As an example, when a first-second magnetic body (54) having the same magnetization value as or a relatively stronger magnetization value than the first magnetic body (50) illustrated in FIG. 1 is placed adjacent to the first capsule (32A), the entire area from the upper part to the lower part of any part of the lower magnetic layer (10) in the thickness direction of the lower magnetic layer (10) can be magnetized (10A). At this time, as illustrated in FIG. 11, both the first magnetophoretic particle (35a) and the second magnetophoretic particle (35b) move, and information is displayed as a mixed color between particles or a dark-colored particle color.

[0096] That is, the strength of the magnetic force that allows a particle to move is determined by its own magnetization value, and this can be called the threshold magnetization value. Depending on this threshold magnetization value, the movement of each particle can be controlled differently.

[0097] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

[0098] <Explanation of symbols>

[0099] 100: Film-type magnetic board

[0100] 10: Lower magnetic layer

[0101] 20: Lower film layer

[0102] 30: Drive layer

[0103] 32: Capsule

[0104] 34: Fluid

[0105] 35: Magnetophoretic particles

[0106] 35a: First magnetophoretic particle

[0107] 35b: Second magnetophoretic particle

[0108] 40: Upper film layer

[0109] 50: First magnetic body

[0110] 52: The 1st magnetic body

[0111] 54: 1-2 Magnet

[0112] 60: Second magnetic body

Claims

1. A film-type magnetic board that can display information using magnetism. A driving layer comprising magnetophoretic particles dispersed within a fluid; An upper film layer located on the upper surface of the driving layer; A lower film layer located on the lower surface of the driving layer; and Including a lower magnetic layer located on the lower surface of the lower film layer, By the magnetic material located on the upper film layer, the magnetophoretic particles are aggregated into the magnetized region of the lower magnetic layer to display information, and the magnetophoretic particles aggregated into the magnetized region of the lower magnetic layer are dispersed to remove information. Film-type magnetic board.

2. In paragraph 1, A film-type magnetic board in which the fluid and the magneto-phoretic particles are encapsulated in the above driving layer.

3. In paragraph 1, The above magnetophoretic particles include superparamagnetic particles, The above magnetophoretic particle contains the substance of MaXb, A film-type magnetic board, wherein the above M may be any one of Cr, Ni, Ti, Zr, Fe, Co, Zn, Gd, Ta, Nb, Pt, Au, Mg, Mn, Pd, Sr, Ag, Ba, Cu, W, Mo, Sn and Pb, the above X may be any one of F, Cl, Br, I and 0, the above a may be greater than 0 and less than 5, and the above b is greater than 0 and less than 5.

4. In paragraph 1, A film-type magnetic board, wherein the magnetophoretic particles include first magnetophoretic particles and second magnetophoretic particles having different magnetization values.

5. In paragraph 1, A film-type magnetic board, wherein the fluid comprises at least one of water, methanol, ethanol, propanol, butanol, propylene carbonate, toluene, benzene, hexane, and isoparaffin oil.

6. In paragraph 1, The above driving layer includes a plurality of capsules, and the film material of the capsule wall forming the plurality of capsules is a transparent material. A film-type magnetic board, wherein the film material of the capsule wall comprises at least one of aginate, gelatin, gum, ethyl cellulose, polyamide, polyvinyl alcohol, alginate, melamine formaldehyde, poly(vinyl pyridine), polystyrene, urethane, polyurethane, urea, polyurea, and methyl methacrylate.

7. In paragraph 1, A film-type magnetic board, wherein the upper film layer and the lower film layer are any one selected from the group consisting of polyester (PET), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polycarbonate (PC), polypropylene (PP), and acrylic film.

8. In paragraph 1, A film-type magnetic board, wherein the magnetic body comprises any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium.

9. In paragraph 1, A film-type magnetic board, wherein the lower magnetic layer comprises a metal compound.

10. In paragraph 1, A film-type magnetic board, wherein the lower magnetic layer comprises any one selected from the group consisting of alnico, ferrite, samarium, cobalt, and neodymium.

11. In paragraph 1, The above magnetic board is a film-type magnetic board that can display information or selectively remove displayed information depending on the magnetic strength of the magnetic material.

12. In paragraph 1, The magnetic board is a film-type magnetic board in which, when a part of the lower magnetic layer is magnetized into a magnetic region by the magnetic substance, information displayed by the driving layer is permanently maintained even if the magnetic substance is removed.

13. A driving method for a film-type magnetic board comprising a driving layer including magneto-phoretic particles dispersed in a fluid; an upper film layer located on an upper surface of the driving layer; a lower film layer located on a lower surface of the driving layer; and a lower magnetic layer located on a lower surface of the lower film layer. A method for driving a film-type magnetic board, wherein information is displayed by causing the magnetophoretic particles to aggregate into the magnetized region of the lower magnetic layer by a magnetic material located on the upper film layer, and information is removed by causing the magnetophoretic particles aggregated into the magnetized region of the lower magnetic layer to disperse.

14. In paragraph 13, A method for driving a film-type magnetic board, wherein the magnetomotive particles include first magnetomotive particles and second magnetomotive particles having different magnetization values.

15. In paragraph 13, The above magnetic board is a driving method of a film-type magnetic board that can display information or selectively remove displayed information depending on the magnetic strength of the magnetic body.

16. In paragraph 13, A method for driving a film-type magnetic board, wherein, when a part of the lower magnetic layer is magnetized into a magnetic region by the magnetic body, information displayed by the driving layer is permanently maintained even if the magnetic body is removed.

17. In paragraph 13, A method for driving a film-type magnetic board, wherein the magnetic board controls at least a portion of the lower magnetic layer to be magnetized when the magnetism of the magnetic body is 100 to 3000 gauss, so that information is displayed by the driving layer.

18. In paragraph 13, A method for driving a film-type magnetic board, wherein the magnetic board is controlled to erase a region where at least a portion of the lower magnetic layer is magnetized when the magnetism of the magnetic body is 2000 to 6000 gauss, thereby removing information displayed by the driving layer.

19. A method for manufacturing a film-type magnetic board using a roll-to-roll process, A step of forming a lower film layer on a lower magnetic layer in which at least a portion of the lower film layer is magnetized and maintained as a magnetic region depending on the position of the magnetic material; A step of forming a driving layer including magnetophoretic particles dispersed in a fluid on the lower film layer; and A method for manufacturing a film-type magnetic board, comprising: forming an upper film layer on the driving layer.

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