Abstract: In a display method or device according to one embodiment of the present invention, at least two of a photonic crystal reflection mode, a unique color reflection mode and a transmittance tuning mode may be implemented to be switched to each other within the same unit pixel. In addition, a machine readable storage medium recording a computer program performing the display method is provided.

Abstract: An apparatus for preventing counterfeiting and alteration according to the present invention includes a magnetic changeable substance carrier part containing a magnetic changeable substance to vary reflected or transmitted light rays as an applied magnetic field is varied; a magnetic field generation part for generating a magnetic field applied to the magnetic changeable substance; and a moveable part for varying at least one of the intensity, direction and pattern of the magnetic field applied to the magnetic changeable substance according to an externally applied stimulus so as to change the appearance of the magnetic changeable substance.

Abstract: A reflective display device includes a display part including a fluid having dispersed therein particles having charges, an electric field applying unit including an electrode for applying an electric field to the display part, and a controller for controlling a color of light emitted from the display part, by adjusting at least one of an intensity, polarity, application time, number of applications, and application cycle of a voltage applied to the electric field applying unit, wherein the controller resets an alignment state of the particles by applying a driving voltage for controlling the color of light emitted from the display part, and then applying an alternating-current (AC) voltage having a polarity opposite to that of the driving voltage.

Abstract: The present invention provides a method of changing color or transmittance of light on a surface part of an object. The surface part of the object includes a solvent and a plurality of particles dispersed in the solvent. When electric field is applied to the solvent and the plurality of particles, the transmittance of color or light on the surface part of the object is changed due to the change of the inter-particle distances or the positions of the particles, according to the magnitude, direction, application time or application frequency of electric field, wherein the magnitude, direction, application time or application frequency of electric field are changed by associating the input signal by the user of the object or the signal acquired by the object or the signal acquired by the sensing unit provided to the object.

Abstract: Provided is a method for manufacturing a reflective display particle, the method including: (a) preparing first and second dispersion solutions by dispersing first and second reflective display materials that reflect light in different wavelength ranges into first and second media that contain a curable material and are unmixed with each other, respectively; (b) forming an emulsion by mixing the prepared first and second dispersion solutions, and encapsulating the emulsion into a capsule; and (c) having the first and second dispersion solutions contained in the encapsulated emulsion undergo phase separation, and curing the phase-separated first and second dispersion solutions by applying energy to the phase-separated first and second dispersion solutions.

Abstract: A forgery and falsification prevention device includes: a variable material containing unit that contains a variable material in which reflected light or transmitted light is changed in response to an application of a display stimulus; and an operation unit that performs a function of changing a display state of the variable material when an external stimulus is applied, by changing light reflection characteristics or light transmission characteristics of the variable material or changing the display stimulus which is applied to the variable material.

Abstract: A reflective display device includes a display part including a fluid having dispersed therein particles having charges, an electric field applying unit including an electrode for applying an electric field to the display part, and a controller for controlling a color of light emitted from the display part, by adjusting at least one of an intensity, polarity, application time, number of applications, and application cycle of a voltage applied to the electric field applying unit, wherein the controller resets an alignment state of the particles by applying a driving voltage for controlling the color of light emitted from the display part, and then applying an alternating-current (AC) voltage having a polarity opposite to that of the driving voltage.

Abstract: A display device and a display method using magnetic particles are disclosed. The display method includes: applying a first magnetic field to a plurality of particles in a state where the plurality of particles having a magnetic property and a certain color are dispersed in a solvent so that the plurality of particles are aligned in a direction parallel to a direction of the first magnetic field, and thus a plurality of particle chains are formed; and applying a second magnetic field to at least a part of the formed plurality of particle chains so that at least a part of the plurality of particle chains moves in a direction close to a display surface in an area to which the second magnetic field is applied, and thus the certain color is displayed on the display surface.

Abstract: A forgery and falsification prevention device includes: a variable material containing unit that contains a variable material in which reflected light or transmitted light is changed in response to an application of a display stimulus; and an operation unit that performs a function of changing a display state of the variable material when an external stimulus is applied, by changing light reflection characteristics or light transmission characteristics of the variable material or changing the display stimulus which is applied to the variable material.

Abstract: According to the method for controlling optical transmissions according to the present invention, in a state where particles formed of a light-blocking material, a first solvent with electro-wetting properties in which the particles are dispersed, and a second solvent which is not mixed with the first solvent are present in a space covered by an optical incident surface, the particles are mixed with the first solvent but not mixed with the second solvent, and an electric field applied to the first solvent is controlled so as to control the blocking area of the first solvent with respect to the optical incident surface and control optical transmittance.

Abstract: According to the method for controlling optical transmissions according to the present invention, in a state where particles formed of a light-blocking material, a first solvent with electro-wetting properties in which the particles are dispersed, and a second solvent which is not mixed with the first solvent are present in a space covered by an optical incident surface, the particles are mixed with the first solvent but not mixed with the second solvent, and an electric field applied to the first solvent is controlled so as to control the blocking area of the first solvent with respect to the optical incident surface and control optical transmittance.

Abstract: According to one embodiment of the present invention, a composite film comprising an indication area for preventing forgery is provided. The indication area comprises a magnetic solution distributed in a cured medium. The magnetic solution is a colloidal solution in which a plurality of magnetic particles charged in the same polarity are dispersed in a fluid, at least one of reflective light and transmittance of the magnetic solution changing when a magnetic field is applied, and an expressive material, of which a predetermined characteristic is expressed when specific energy is applied, is present separately from the magnetic solution in the cured medium.

Abstract: This invention relates to a manufacturing method of colloid comprising magnetic nanoclusters and magnetic nanocluster colloid made by the same. More particularly, this invention relates to a manufacturing method of colloid comprising magnetic nanoclusters comprising magnetic precursor and heterometal precursor by a certain ratio and magnetic nanocluster colloid made by the same.

Abstract: The present invention relates to a surface treatment method for magnetic particles, a magnetic composite prepared thereby, and a magnetic composite for labeling target materials. More specifically, the invention relates to a surface treatment method for magnetic particles and a magnetic composite having excellent dispersibility prepared thereby, wherein the surface treatment method comprises the steps of: performing the acid-treatment of magnetic particles and mixing the acid-treated magnetic particles with a water-soluble solvent in order to form a hydroxyl group (—OH) on the surface of the magnetic particles; and mixing the magnetic particles, in which the hydroxyl group is formed, with a surface treatment agent containing an organic ligand, which can be bonded to the hydroxyl group, so that the organic ligand is treated on the surface of the magnetic particles.

Abstract: A display device and a display method using magnetic particles are disclosed. The display method includes: applying a first magnetic field to a plurality of particles in a state where the plurality of particles having a magnetic property and a certain color are dispersed in a solvent so that the plurality of particles are aligned in a direction parallel to a direction of the first magnetic field, and thus a plurality of particle chains are formed; and applying a second magnetic field to at least a part of the formed plurality of particle chains so that at least a part of the plurality of particle chains moves in a direction close to a display surface in an area to which the second magnetic field is applied, and thus the certain color is displayed on the display surface.

Abstract: According to one embodiment of the present invention, a composite film comprising an indication area for preventing forgery is provided. The indication area comprises a magnetic solution distributed in a cured medium. The magnetic solution is a colloidal solution in which a plurality of magnetic particles charged in the same polarity are dispersed in a fluid, at least one of reflective light and transmittance of the magnetic solution changing when a magnetic field is applied, and an expressive material, of which a predetermined characteristic is expressed when specific energy is applied, is present separately from the magnetic solution in the cured medium.

Abstract: The present invention provides a printing medium, a printing method, and a printing apparatus using a photonic crystal characteristic. According to the present invention, the printing medium using the photonic crystal characteristic comprises a medium in which a plurality of particles having electric charges are dispersed, wherein the inter-particle distances of the particles are controlled as a result of at least one of electric fields and magnetic fields are applied to the medium, and the inter-particle distances of the particles are fixed as the energy is applied to the medium.

Abstract: A display method and device using photonic crystal characteristics are disclosed. In the display method using photonic crystal characteristics when a plurality of particles having electric charges is dispersed in a solvent, an electric field is applied to control inter-particle distance.

Abstract: This invention relates to a manufacturing method of colloid comprising magnetic nanoclusters and magnetic nanocluster colloid made by the same. More particularly, this invention relates to a manufacturing method of colloid comprising magnetic nanoclusters comprising magnetic precursor and heterometal precursor by a certain ratio and magnetic nanocluster colloid made by the same.

Abstract: The present disclosure relates to a display method and device using an electromagnetophoretic property. The display method includes: applying at least one of an electric field and magnetic field to a plurality of particles configured to possess an electric charge and magnetic property and to exhibit a first color, in a state in which the particles are dispersed in a solvent configured to exhibit a second color, so that at least one of the first and second colors is exhibited; and changing at least one of intensity and orientation of the applied electric field or magnetic field, so that the particles are moved in a predetermined direction to exhibit at least one of the first and second colors.