Non-volatile display device

Abstract

The present invention relates to a non-volatile display device, which can maintain a specific image for a desired period of time, turn off an image of a display by blocking a magnetic field, and re-form the same image by re-applying the magnetic field. To this end, the present invention provides the non-volatile display device comprising: a magnetic field application unit using a permanent magnet and / or an electromagnet so as to generate a magnetic field; a magnetic field image formation unit for forming the magnetic field generated by the magnetic field application unit into a magnetic field distribution for forming a desired image; and a magnetic field response visual effect varying unit for changing a visual effect including color, reflection, and shading concentration in response to the magnetic field distribution formed by the magnetic field image formation unit.

Description

nonvolatile display device

[0001] The present invention relates to a nonvolatile display device. More specifically, it relates to a nonvolatile display device utilizing control of magnetic particles.

[0002] Displays are widely used for various purposes such as information transmission, entertainment, and indoor and outdoor decoration.

[0003] There are various types of displays, including liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light-emitting diode (OLEDs), and each has its own advantages and disadvantages.

[0004] For content where the image on the screen is constantly changing, such as information transmission and entertainment, it is okay to use a general volatile display because the current can be controlled for each pixel by receiving a screen signal.

[0005] However, there is a problem that it is not suitable for displaying a specific image on a screen, such as for indoor and outdoor decoration, and maintaining the same image for a desired period of time by the user, and displaying the same image as the original even when the current is cut off and then re-applied.

[0006] In addition, the above-mentioned general display implements images by controlling the direction of liquid crystals, controlling whether or not to discharge specific pixels, etc., so there is a limit to creating a mysterious aesthetic sense through changes in three-dimensionality, brightness, and unevenness depending on the viewing direction.

[0007] Prior art document: KR Utility Model Registration No. 0476777 (announced on April 8, 2015)

[0008] The present invention has been devised to solve the above problems, and in particular, its purpose is to provide a non-volatile display device that can be used as a kind of work of art for various purposes such as indoor / outdoor decoration and advertising.

[0009] In order to achieve the above object, a non-volatile display device according to the present invention comprises: a magnetic field applying unit that generates a magnetic field using at least one of a permanent magnet and an electromagnet; a magnetic field image forming unit that generates a magnetic field generated by the magnetic field applying unit into a magnetic field distribution for forming a desired image; and a magnetic field responsive visual effect variable unit that changes visual effects including color, reflection, and shade density in response to the magnetic field distribution generated by the magnetic field image forming unit.

[0010] In addition, an embodiment according to the present invention may further include a magnetic field induction unit positioned between a magnetic field application unit and a magnetic field image formation unit, and inducing a magnetic field applied from the magnetic field application unit to the magnetic field image formation unit and the magnetic field response visual effect variable unit.

[0011] Additionally, the magnetic field application portion can be formed with a different area from the magnetic field response visual effect variable portion.

[0012] Additionally, the magnetic field applying portions may be arranged in pairs spaced apart from each other at both ends of the magnetic field response visual effect variable portion or on the side of the non-volatile display device.

[0013] In addition, when the magnetization directions of a pair of magnetic field application parts are the same, a magnetic field is formed in the magnetic field induction part, a magnetic field is applied to the image formation layer, and a visual effect can be expressed in the magnetic field response visual effect variable part according to the spatial distribution of the magnetic field induced in the image formation layer.

[0014] In addition, when the magnetization directions of a pair of magnetic field application parts are opposite to each other, a magnetic field is formed along the surface of the magnetic field induction part, so that no magnetic field is applied to the image formation layer, and since no magnetic field is induced in the image formation layer, a visual effect can be prevented from being expressed in the magnetic field response visual effect variable part.

[0015] In addition, the magnetic field application unit can turn on and off the image formed in the magnetic field response visual effect variable unit and control the visual effect according to the strength of the current applied to the electromagnet or by the spatial movement or rotation of the permanent magnet.

[0016] In addition, the magnetic field applying unit can turn on / off the image formed in the magnetic field response visual effect variable unit and control the visual effect by mechanically changing the direction of the magnet including the magnetic switch and the magnetic chuck.

[0017] In addition, one pair of magnetic field applying units is a permanent magnet, and the magnetization direction of the permanent magnet can be switched by mechanically rotating the magnet, including the magnetic switch and the magnetic chuck, to change the direction of the poles of either of the permanent magnets.

[0018] In addition, a pair of magnetic field applying units are permanent magnets, and the magnetization direction of the permanent magnets can be reversed by applying a pulse current having an intensity greater than a threshold value to either of the two permanent magnets.

[0019] In addition, since only a pulse current is required to reverse the magnetization state and no current is required to maintain the magnetic field in the reversed state, the image of the variable part of the visual effect of the magnetic field response can be maintained even after the pulse current is cut off.

[0020] Additionally, the magnetic field image forming unit may include a rough layer having roughness formed on the surface of a magnetic material.

[0021] Additionally, the magnetic field image forming unit may include a magnetic domain layer, which is a magnetic layer in which magnetic domains are formed.

[0022] Additionally, the magnetic field image forming unit may include a layered structure of magnetic domain layers.

[0023] Additionally, the magnetic field image forming unit may include a laminated structure of a rough layer and a magnetic domain layer.

[0024] Additionally, the magnetic field image forming unit may include a magnetic layer in which magnetic domains and irregularities are formed simultaneously in one layer.

[0025] In addition, the magnetic field responsive visual effect variable part can display an image by changing the visual effects including the arrangement of particles including the spacing and direction of particles according to the magnetic field, the direction of asymmetrical particles, the absorption according to the wavelength (color) of light, the direction and intensity of light reflection, and the brightness and opacity of light according to the distribution concentration of particles, including the magnetic particles moving fluidly.

[0026] In addition, the magnetic field response visual effect variable part is made in a state where one or more asymmetric particles are mixed and encapsulated with a fluid liquid to enable a fluid response, and a change in the direction of the asymmetric particles occurs depending on the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming part, thereby causing a change in the reflection of light, so that various visual effects can be implemented.

[0027] In addition, the magnetic field response visual effect variable part is made in a state where a plurality of symmetrical particles are mixed and encapsulated with a fluid liquid to enable a fluid response, and the spacing and arrangement direction of the plurality of particles are determined in response to the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming part, and the absorption of light varies depending on the relationship between the spacing of the particle arrangement structure and the wavelength of light, so that a color is implemented, and the light can be asymmetrically reflected depending on the arrangement direction of the particles to form a three-dimensional effect.

[0028] According to the present invention, by controlling the application of a magnetic field to an image forming unit having image information, a spatial distribution of the magnetic field is formed according to the image information, and a visual effect including color, reflection, and shade concentration can be beautifully and mysteriously expressed on a display including moving magnetic particles.

[0029] In addition, the present invention has the effect of providing a non-volatile display device that can maintain a specific image for a desired period of time, turn off the image on the display by blocking a magnetic field, and re-form the same image by re-applying the magnetic field.

[0030] In addition, according to the present invention, there is an effect of reducing the thickness of a non-volatile display device by providing a degree of freedom in the spatial arrangement of a magnetic field applying portion through a magnetic field induction portion.

[0031] Figure 1 is a conceptual diagram of a nonvolatile display device according to one embodiment of the present invention.

[0032] Figures 2 to 5 are conceptual drawings illustrating cross-sections of nonvolatile display devices according to various embodiments of the present invention.

[0033] Figures 6 to 12 are conceptual diagrams for explaining an on / off method of applying a magnetic field in a nonvolatile display device according to various embodiments of the present invention.

[0034] Figure 13 is a conceptual diagram of a nonvolatile display device according to another embodiment of the present invention.

[0035] Figures 14 and 15 are conceptual diagrams illustrating a structure for controlling whether a magnetic field is formed in the embodiment of Figure 13.

[0036] Figures 16 and 17 are conceptual diagrams illustrating various embodiments of the magnetic field image forming unit in the present invention.

[0037] Figures 18 to 21 are photographs of actually implementing a nonvolatile display device according to an embodiment of the present invention.

[0038] A nonvolatile display device according to the present invention includes a magnetic field applying unit that generates a magnetic field using at least one of a permanent magnet and an electromagnet; a magnetic field image forming unit that generates a magnetic field generated by the magnetic field applying unit into a magnetic field distribution for forming a desired image; and a magnetic field responsive visual effect variable unit that changes visual effects including color, reflection, and shade density in response to the magnetic field distribution generated by the magnetic field image forming unit.

[0039] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals as much as possible even if they are shown in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known structure or function is judged to obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, although preferred embodiments of the present invention will be described below, it should be understood that the technical idea of ​​the present invention is not limited thereto and can be modified and implemented in various ways by those skilled in the art.

[0040] FIG. 1 is a conceptual diagram of a nonvolatile display device according to one embodiment of the present invention, FIGS. 2 to 5 are conceptual diagrams illustrating cross-sections of nonvolatile display devices according to various embodiments of the present invention, FIGS. 6 to 12 are conceptual diagrams for explaining an on / off method of applying a magnetic field in a nonvolatile display device according to various embodiments of the present invention, FIG. 13 is a conceptual diagram of a nonvolatile display device according to another embodiment of the present invention, and FIGS. 14 and 15 are conceptual diagrams illustrating a structure for controlling the presence or absence of magnetic field formation in the embodiment of FIG. 13. FIGS. 16 and 17 are conceptual diagrams illustrating various embodiments of a magnetic field image forming unit in the present invention.

[0041] The "volatility" of a volatile display device can mean that an image is formed on the display panel when a driving force, such as current, is applied, and that the image disappears when the driving force is removed. Conversely, the "non-volatility" of a non-volatile display device can mean that the image formed when the driving force was applied disappears when the driving force is removed, but the original image remains when the driving force is reapplied.

[0042] If a non-volatile display device is defined by the former concept, the present invention can be implemented so that the same image is maintained by using a permanent magnet as the magnetic field applying unit. If a non-volatile display device is defined by the latter concept, the present invention can be implemented by turning the magnetic field applying unit on and off without changing the magnetic field image forming unit.

[0043] Regardless of how the non-volatile display device is defined, the non-volatile display device according to the present invention can implement a non-volatile display.

[0044] Referring to FIG. 1, a nonvolatile display device according to one embodiment of the present invention comprises a magnetic field applying unit (100), a magnetic field induction unit (200), a magnetic field image forming unit (300), and a magnetic field response visual effect variable unit (400). In this case, the magnetic field induction unit (200) may be omitted if a magnetic field can be applied directly from the magnetic field applying unit (100) to the magnetic field image forming unit (300) and the magnetic field response visual effect variable unit (400).

[0045] In addition, although each component of the nonvolatile display device is illustrated in layers for convenience in FIG. 1, it is to be noted that it does not necessarily have to be in layers and can be formed in various shapes and positions, and the thickness and size of each component can also be formed differently depending on the situation and purpose.

[0046] In general, when the magnetic field applying portion (100) is arranged to have the same area as the magnetic field image forming portion (300) and the magnetic field response visual effect variable portion (400), as shown in FIG. 1, FIG. 2(b), and FIG. 3(b), there is no need to form a magnetic field induction portion to increase the thickness of the non-volatile display device.

[0047] On the other hand, in the case where the magnetic field applying unit (100) is arranged to have a different area from the magnetic field image forming unit (300) and the magnetic field response visual effect variable unit (400) as shown in FIGS. 2(a) and 3(b), and in the case where the magnetic field applying units (104, 106) are arranged in multiple numbers spaced apart from each other at both ends or sides of the non-volatile display device as shown in FIGS. 4 and 5, a magnetic field induction unit (200) is required to induce the magnetic field applied from the magnetic field applying unit to the magnetic field image forming unit (300) and the magnetic field response visual effect variable unit (400).

[0048] The magnetic field applying unit (100) creates a magnetic field using at least one of a permanent magnet and an electromagnet.

[0049] The magnetic field image forming unit (300) generates the magnetic field generated by the magnetic field applying unit (100) into a magnetic field distribution for forming a desired image. The magnetic field image forming unit (300) can be implemented as a rough layer of magnetic material, a magnetic domain layer, etc., which will be described later.

[0050] The magnetic field response visual effect variable part (400) changes visual effects including color, reflection, and shade density in response to the magnetic field distribution formed in the magnetic field image forming part (300). The magnetic field response visual effect variable part (400) can be implemented in a form in which symmetrical magnetic particles and / or asymmetrical magnetic particles are contained in a fluid liquid, and this will be described later.

[0051] The magnetic field induction unit (200) is located between the magnetic field application unit (100) and the magnetic field image formation unit (300) and induces the magnetic field applied from the magnetic field application unit (100) to the magnetic field image formation unit (300) and the magnetic field response visual effect variable unit (400). The magnetic field induction unit (200) may be formed of a magnetic material such as a soft magnet.

[0052] As shown in FIGS. 1, 2(b), and 3(b), the magnetic field applying portion (100) may be formed to have the same area as the magnetic field response visual effect variable portion (400), but may also be formed to have a different area from the magnetic field response visual effect variable portion (400), as shown in FIGS. 2(a) and 3(a). In particular, as shown in FIGS. 4, 5, and 13, the magnetic field applying portions (100) may be arranged as a pair spaced apart from each other at both ends of the magnetic field response visual effect variable portion (400) or on the side of the non-volatile display device.

[0053] To reduce the thickness of a non-volatile display device, it is advantageous to place the magnetic field application unit at the edge of the non-volatile display device. In this case, as mentioned above, a magnetic field induction unit must be provided.

[0054] As shown in Fig. 2(a), the magnetic field applying unit (100) may be implemented with a permanent magnet having a different area from the magnetic field response visual effect reacting unit (400), or may be implemented with a permanent magnet having the same area as shown in Fig. 2(b). In this case, unless the permanent magnet of the magnetic field applying unit (100) is rotated or the distance of the permanent magnet from the magnetic field induction unit (200) or the magnetic field image forming unit (300) is changed, the image formed on the non-volatile display device remains unchanged.

[0055] As shown in Fig. 3(a), the magnetic field application unit (102) may be implemented as an electromagnet having a different area from the magnetic field response visual effect response unit (400), or as an electromagnet having the same area as shown in Fig. 3(b). In this case, the image formed on the non-volatile display device remains unchanged unless the size or direction of the current applied to the electromagnet of the magnetic field application unit (102) is changed.

[0056] Referring to FIG. 4, an example is illustrated in which a magnetic field applying unit (104) is arranged in pairs with permanent magnets spaced apart from each other on both ends of a magnetic field response visual effect variable unit (400) or on the side of a non-volatile display device.

[0057] Referring to FIG. 5, an example is shown in which a magnetic field applying unit (106) is arranged in pairs with electromagnets spaced apart from each other on both ends of a magnetic field response visual effect variable layer (400) or on the side of a non-volatile display device.

[0058] Referring to Fig. 6, an example is shown in which a magnetic field applying unit is implemented as an electromagnet, and an image formed in a magnetic field response visual effect variable unit is turned on and off and the visual effect is adjusted according to the strength of the current applied to the electromagnet.

[0059] Referring to Fig. 6, it can be confirmed that the particle arrangement of the magnetic field response visual effect variable part changes depending on the current intensity, and accordingly, the light reflection mechanism changes, so that visual effects such as color, shade, and three-dimensionality can be controlled.

[0060] Referring to Fig. 7, an example is shown in which a magnetic field applying unit is implemented as a permanent magnet, and an image formed in a magnetic field response visual effect variable unit is turned on and off and the visual effect is adjusted according to the movement of the permanent magnet.

[0061] Figure 7 shows an example of moving a permanent magnet in the up-and-down direction, but it is also possible to control the applied magnetic field in the left-right direction as well as through rotation of the permanent magnet.

[0062] Referring to Fig. 8, an example is shown in which a magnetic field applying unit is implemented as an electromagnet, and an image formed in a magnetic field response visual effect variable unit is turned on and off and the visual effect is adjusted according to the current intensity of the electromagnet.

[0063] Referring to Fig. 9, an example is illustrated in which a magnetic field applying unit is implemented as a permanent magnet, and the direction of the permanent magnet is mechanically switched to turn on / off an image formed in a magnetic field response visual effect variable unit and control the visual effect. In this case, the mechanical direction switching of the permanent magnet may be performed by a magnetic switch, a magnetic chuck, or the like, but is not limited thereto.

[0064] Referring to Fig. 10, an example of turning on and off an image formed in a magnetic field response visual effect variable section using multiple magnetic field forming structures is illustrated. In the embodiment of Fig. 10, multiple magnetic fields are formed using a pair of permanent magnets.

[0065] As mentioned above, in order to separate the magnetic field applying units from each other as in Fig. 10, a magnetic field induction unit is required between the magnetic field applying unit and the magnetic field image forming unit. By applying the magnetic field induction unit and arranging the magnetic field applying unit on both sides of the non-volatile display device, the thickness of the non-volatile display device can be reduced.

[0066] Referring to Fig. 10(a), when the magnetization directions of a pair of magnetic field application parts are the same, a magnetic field is formed in the magnetic field induction part, a magnetic field is applied to the image formation layer, and a visual effect is expressed in the magnetic field response visual effect variable part according to the spatial distribution of the magnetic field induced in the image formation layer.

[0067] Meanwhile, referring to Fig. 10(b), when the magnetization directions of a pair of magnetic field application parts are opposite to each other, a magnetic field is formed along the surface of the magnetic field induction part, so no magnetic field is applied to the image formation layer, and since no magnetic field is induced in the image formation layer, no visual effect is expressed in the magnetic field response visual effect variable part.

[0068] Referring to Fig. 11, an example of turning on and off an image formed in a magnetic field response visual effect variable section by switching the polar direction through mechanical rotation of one of a pair of permanent magnets is illustrated. Fig. 11 is an implementation of the principle of Fig. 10 through mechanical rotation of a permanent magnet, and the polar direction of one of the two permanent magnets is switched using a magnetic switch, magnetic chuck, or the like.

[0069] Referring to Fig. 12, an example of turning on and off an image formed in a variable magnetic field response visual effect section by switching the polar direction through reversal of the magnetization direction of one of a pair of permanent magnets is illustrated. Fig. 12 is an implementation of the principle of Fig. 10 through reversal of the magnetization direction of the permanent magnet, and the polar direction of one of the two permanent magnets is switched using a pulse current. At this time, a pulse current having an intensity greater than a threshold value is applied to one of the two permanent magnets to reverse the magnetization state.

[0070] When using a pulse current as in Fig. 12, only a pulse current is required to reverse the magnetization state, and no current is required to maintain the magnetic field in the reversed state, so there is an advantage in that the image of the variable part of the visual effect of the magnetic field response is maintained even after the pulse current is cut off.

[0071] Referring to Fig. 13, a layer structure is illustrated in which a magnetic field applying unit (110) is positioned at both ends of a non-volatile display device. In this case, a magnetic field induction unit (200) must be provided.

[0072] Referring to Fig. 14, when the magnetization directions of the magnetic field application parts on both sides are the same, a magnetic field is formed in the direction of the arrow in the magnetic field induction part, and a magnetic field is applied to the magnetic field image forming part, and an image is recorded in the form of a rough or magnetic domain in the magnetic field image forming part (yellow), so a visual effect is expressed in the magnetic field response visual effect variable part (green) according to the spatial distribution of the magnetic field induced in the magnetic field image forming part.

[0073] Referring to Fig. 15, when the magnetization directions of the magnetic field application portions on both sides are opposite, a magnetic field is formed in the direction of the arrow along the surface in the magnetic field induction portion, and no magnetic field is applied to the magnetic field image formation portion. Since no magnetic field is induced in the magnetic field image formation portion, no visual effect is expressed in the magnetic field response visual effect variable portion.

[0074] Referring to FIG. 16, the magnetic field image forming portion may be composed of a rough layer and / or a magnetic domain layer.

[0075] The roughened layer and the magnetic domain layer can be formed of soft or ferromagnetic materials.

[0076] Since the soft magnet does not generate a magnetic field in the absence of an external magnetic field, it does not cause a visual effect in the variable part of the magnetic field response visual effect.

[0077] Since ferromagnetism can generate its own magnetic field when there is a magnetic field or irregularity, it can affect the variable part of the visual effect of the magnetic field response. However, if it is thin enough, the strength of the magnetic field may be weak and may not cause significant changes in the variable part of the visual effect of the magnetic field response.

[0078] Referring to Fig. 16(a), the magnetic field image forming unit may include a rough layer having roughness formed on the surface of a magnetic material.

[0079] Referring to Fig. 16(b), the magnetic field image forming unit may include a magnetic domain layer, which is a magnetic layer in which magnetic domains are formed.

[0080] Referring to Fig. 16(c), the magnetic field image forming unit may include a laminated structure of magnetic domain layers.

[0081] Referring to Fig. 17(d), the magnetic field image forming unit may include a laminated structure of a rough layer and a magnetic domain layer.

[0082] Referring to Fig. 17(e), the magnetic field image forming unit may include a magnetic layer in which magnetic domains and irregularities are formed simultaneously in one layer.

[0083] Referring to Fig. 17(f), a structure in which protrusions are laminated on the upper or lower part of the magnetic domain laminate structure may be included.

[0084] The magnetic field-responsive visual effect variable part includes magnetic particles that move fluidly, and depending on the magnetic field, the arrangement of particles including the spacing and direction of particles, the direction of asymmetrical particles, the distribution concentration of particles, the absorption according to the wavelength (color) of light, the direction and intensity of light reflection, and the brightness and opacity of light change the visual effect to display the image.

[0085] The magnetic field response visual effect variable portion may be composed of only symmetric particles, only asymmetric particles, or a combination of symmetric and asymmetric particles.

[0086] Here, the term asymmetric particle is used as a concept that includes not only structural anisotropy but also optical anisotropy.

[0087] For example, the magnetic field responsive visual effect variable part is made capable of fluid reaction by mixing and encapsulating one or more asymmetric particles with a fluid liquid, and the direction of the asymmetric particles changes depending on the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming part, thereby causing a change in the reflection of light, thereby enabling the implementation of various visual effects.

[0088] In addition, the magnetic field response visual effect variable part is made in a state where a plurality of symmetrical particles are mixed and encapsulated with a fluid liquid to enable a fluid response, and the spacing and arrangement direction of the plurality of particles are determined in response to the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming part, and the absorption of light varies depending on the relationship between the spacing of the particle arrangement structure and the wavelength of light, so that a color is implemented, and the light can be asymmetrically reflected depending on the arrangement direction of the particles to form a three-dimensional effect.

[0089] Figures 18 to 21 are photographs showing examples of actually implementing a non-volatile display device according to the present invention.

[0090] Referring to Fig. 18, an example of a magnetic field image forming part having a traditional house image formed in a rough manner on a glass or plastic plate is illustrated.

[0091] Referring to Fig. 19, when a magnetic field is applied to the magnetic field image forming part of Fig. 18, it can be confirmed that the image information of the magnetic field image forming part in the magnetic field response visual effect variable part is implemented in a mysterious and beautiful form with colors, shades, and three-dimensionality.

[0092] Referring to Figure 20, an example of a magnetic field image forming section formed by stacking a magnetic domain layer on a rough layer is illustrated.

[0093] Referring to Fig. 21, when a magnetic field is applied to the magnetic field image forming section of Fig. 20, it can be confirmed that the image information of the uneven layer (traditional house image) and the image information of the magnetic domain layer (letters "TP") are combined and implemented in the magnetic field response visual effect variable section.

[0094] The above description is merely an illustrative description of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications, changes, and substitutions may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of ​​the present invention, but rather to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments and the accompanying drawings. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

[0095] The present invention can be widely applied to the display field.

Claims

1. A magnetic field applying unit that creates a magnetic field using at least one of a permanent magnet and an electromagnet; A magnetic field image forming unit that creates a magnetic field generated in a magnetic field applying unit into a magnetic field distribution to form a desired image; and A magnetic field-responsive visual effect variable section in which visual effects including color, reflection, and shade density change in response to the magnetic field distribution formed in the magnetic field image forming section. A non-volatile display device, including:

2. In paragraph 1, A magnetic field induction unit located between a magnetic field application unit and a magnetic field image formation unit, which induces the magnetic field applied from the magnetic field application unit to the magnetic field image formation unit and the magnetic field response visual effect variable unit. A non-volatile display device further comprising:

3. In paragraph 2, A non-volatile display device in which the magnetic field applying portion is formed with a different area from the magnetic field response visual effect variable portion.

4. In paragraph 3, A non-volatile display device in which a magnetic field applying section is arranged in pairs at opposite ends of a magnetic field response visual effect variable section or at the side of a non-volatile display device, spaced apart from each other.

5. In paragraph 4, A non-volatile display device in which a magnetic field is formed in a magnetic field induction section when the magnetization directions of a pair of magnetic field application sections are the same, a magnetic field is applied to an image formation layer, and a visual effect is expressed in a magnetic field response visual effect variable section according to the spatial distribution of the magnetic field induced in the image formation layer.

6. In paragraph 4, A non-volatile display device in which, when the magnetization directions of a pair of magnetic field applying parts are opposite to each other, a magnetic field is formed along the surface of the magnetic field inducing part, no magnetic field is applied to the image forming layer, and no visual effect is expressed in the magnetic field response visual effect variable part because no magnetic field is induced in the image forming layer.

7. In paragraph 1, A non-volatile display device that turns on and off an image formed in a magnetic field-responsive visual effect variable section and controls the visual effect according to the strength of the current applied to the electromagnet or by the spatial movement or rotation of the permanent magnet.

8. In paragraph 1, A non-volatile display device that turns on and off an image formed in a magnetic field-responsive visual effect variable section and controls a visual effect by mechanically changing the direction of a magnet, including a magnetic switch and a magnetic chuck.

9. In paragraph 5 or 6, A non-volatile display device in which a pair of magnetic field applying units are permanent magnets, and the magnetization direction of one of the permanent magnet poles is switched through mechanical rotation of the magnet, including a magnetic switch and a magnetic chuck.

10. In paragraph 5 or 6, A non-volatile display device in which a pair of magnetic field applying units are permanent magnets, and the magnetization direction of the permanent magnets is reversed by applying a pulse current having a strength greater than a threshold value to one of the two permanent magnets.

11. In paragraph 10, A non-volatile display device that requires only a pulse current to reverse the magnetization state and no current to maintain the magnetic field in the reversed state, so that the image of the variable part of the magnetic field response visual effect is maintained even after the pulse current is cut off.

12. In paragraph 1, A non-volatile display device, wherein the magnetic field image forming unit includes a rough layer having roughness formed on the surface of a magnetic material.

13. In paragraph 1, A non-volatile display device, wherein the magnetic field image forming unit includes a magnetic domain layer, which is a magnetic layer in which magnetic domains are formed.

14. In paragraph 1, A non-volatile display device, wherein the magnetic field image forming unit includes a laminated structure of magnetic domain layers.

15. In paragraph 1, A non-volatile display device, wherein the magnetic field image forming unit includes a laminated structure of a rough layer and a magnetic domain layer.

16. In paragraph 1, A non-volatile display device, wherein the magnetic field image forming unit includes a magnetic layer in which magnetic domains and irregularities are formed simultaneously in one layer.

17. In paragraph 1, A non-volatile display device that displays an image by changing the visual effects including the arrangement of particles including the spacing and direction of particles according to the magnetic field, the direction of asymmetrical particles, the direction and intensity of absorption and reflection of light according to the wavelength (color) of light, and the brightness and opacity of light according to the distribution concentration of particles, including magnetic particles that move fluidly.

18. In paragraph 1 or paragraph 17, A non-volatile display device in which a magnetic field-responsive visual effect variable portion is formed by mixing and encapsulating one or more asymmetric particles with a fluid liquid to enable a fluid reaction, and a change in the direction of the asymmetric particles occurs depending on the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming portion, thereby causing a change in the reflection of light, thereby implementing various visual effects.

19. In any one of paragraphs 1, 17, and 18, A non-volatile display device in which a magnetic field-responsive visual effect variable part is made capable of fluid reaction by mixing and encapsulating a plurality of symmetrical particles with a fluid liquid, and the spacing and arrangement direction of the plurality of particles are determined in response to the spatial direction and intensity distribution of the magnetic field applied from the magnetic field image forming part, and the absorption of light varies according to the relationship between the spacing of the particle arrangement structure and the wavelength of light, and the light is asymmetrically reflected according to the arrangement direction of the particles to form a three-dimensional effect.

Images