KR101154372B1 - Display method and device using photonic crystal characteristics - Google Patents

Abstract

Disclosed are a display method and an apparatus using photonic crystallinity. The display method using the photonic crystallinity according to the present invention is characterized by controlling an interval between the particles by applying an electric field in a state in which a plurality of particles having charges are dispersed.

Description

DISPLAY METHOD AND DEVICE USING PHOTONIC CRYSTAL CHARACTERISTICS}

The present invention relates to a display method and a display device using photonic crystallinity. More particularly, the present invention relates to a display method and a display device using photonic crystallinity which controls an interval between the particles by applying an electric field to a plurality of particles having an electric charge, thereby controlling the wavelength of light reflected from the particles.

Recently, as research and development on next-generation displays have been actively conducted, various display means have been introduced. An example of a next-generation display is electronic ink. Electronic ink is a display that expresses a specific color by applying an electric field to a capsule containing particles of a specific color (for example, black and white, respectively) having negative and positive charges, respectively, which reduces power consumption and is flexible. There is an advantage to enabling the display. However, the electronic ink has a limitation in that it is difficult to express various colors because the color of the particles is fixed to a specific color, and there is a limitation that the display switching speed is not suitable for expressing a moving image.

Various methods have been proposed to fundamentally solve the problems of the conventional next generation display, and among them, a method of using the principle of photonic crystal can be considered.

Photonic crystal refers to a material or crystal having a characteristic of having a color corresponding to a specific wavelength by reflecting only light of a specific wavelength of incident light and passing light of the remaining wavelengths. Shells; Although they do not contain a pigment, they contain a unique photonic crystal structure, and thus they can give a unique color.

According to a recent study on photonic crystals, photonic crystals containing a certain material are crystallized by various external stimuli, in contrast to conventional photonic crystals in nature, which reflect only light of a specific wavelength. It has been found that the structure (for example, the interlayer thickness constituting the photonic crystal) can be arbitrarily changed, and as a result, the wavelength of light reflected back to the ultraviolet or infrared region as well as the visible region can be freely adjusted.

Accordingly, the present inventors have realized that the present invention can realize a display method and a display device using photonic crystallinity reflecting light of an arbitrary wavelength by applying an electric field to particles having an electric charge to control the spacing of particles. .

An object of the present invention is to control the wavelength of light reflected from particles by applying an electric field to a plurality of particles having an electric charge to control the spacing between the particles.

In addition, an object of the present invention is to provide a display method and a display device using photonic crystallinity that controls the wavelength of light reflected from the particles by applying an electric field to the plurality of particles having a charge to control the distance between the particles.

In order to achieve the above object, the display method using the photonic crystallinity according to the present invention is characterized in that the distance between the particles is controlled by applying an electric field in a state in which a plurality of particles having a charge is dispersed.

The display method using photonic crystallinity according to the present invention is characterized by controlling an interval between the particles by applying an electric field and a magnetic field in a state in which a plurality of particles having charges are dispersed.

The particles may be in the colloidal state.

An interval between the particles may change according to at least one of the intensity or polarity direction of the electric field, and the wavelength of light reflected from the particles may change according to the change of the gap.

The particles may have charge on their own or may have charge by arbitrarily changing the properties of the particles.

The particles can be encapsulated in a capsule of light transmissive material in a dispersed state in any solvent.

The particles can be interspersed in the medium of the light transmissive material in a dispersed state in any solvent.

After the electric field is applied to the particles, an electric field in a direction opposite to the electric field may be applied to initialize the gap between the particles.

The particles include first particles having a negative charge and second particles having a positive charge, and the spacing between the first particles and the spacing between the second particles can be controlled independently of each other by the electric field.

The particles include first particles and second particles partitioned based on the ground electrode to which a ground voltage is applied, and different electric fields with respect to the first particles and the second particles using the ground electrode. It is possible to control the spacing between the first particles and the spacing between the second particles independently of each other by applying.

The spacing between the particles may change according to at least one of the intensity or polarity of the magnetic field, and the wavelength of light reflected from the particles may change according to the change of the spacing.

The particles may include at least one component of Fe, Co, Ni.

In addition, a display device using photonic crystallinity according to the present invention includes a display unit including a plurality of particles having electric charges, and an electric field generating unit for generating an electric field applied to the display unit, wherein the plurality of particles having electric charges are dispersed. In this state, the electric field is applied to control the gap between the particles.

In addition, a display device using photonic crystallinity according to the present invention includes a display unit including a plurality of particles having electric charges, an electric field generating unit for generating an electric field applied to the display unit, and a magnetic field generation for generating a magnetic field applied to the display unit. And an electric field and the magnetic field in a state in which a plurality of particles having the charges are dispersed, thereby controlling a distance between the particles.

The particles may be in the colloidal state.

An interval between the particles may change according to at least one of the intensity or polarity direction of the electric field, and the wavelength of light reflected from the particles may change according to the change of the gap.

The particles may have charge on their own or may have charge by arbitrarily changing the properties of the particles.

The particles can be encapsulated in a capsule of light transmissive material in a dispersed state in any medium.

The particles can be interspersed in the medium of the light transmissive material in a dispersed state in any solvent.

The display device may further include a controller configured to control the electric field generating unit to apply an electric field in a direction opposite to the electric field after applying the electric field to the display unit, and the interval between the particles is initialized by the operation of the controller. can do.

The particles include first particles having a negative charge and second particles having a positive charge, and the spacing between the first particles and the spacing between the second particles can be controlled independently of each other by the electric field.

The electric field applying unit may include a ground electrode to which a ground voltage is applied, and the particles may include first particles and second particles defined based on the ground electrode, and the display device may use the ground electrodes. By applying different electric fields to the first particles and the second particles, it is possible to independently control the distance between the first particles and the distance between the second particles.

The spacing between the particles may change according to at least one of the intensity or polarity of the magnetic field, and the wavelength of light reflected from the particles may change according to the change of the spacing.

The particles may include at least one component of Fe, Co, Ni.

According to the present invention configured as described above, by controlling the interval between the particles having a charge by controlling the wavelength of the light reflected from the particles it is possible to achieve the effect of realizing a full color (color structure) color.

In addition, according to the present invention, by independently controlling the particles having an electric charge, the effect of enabling a more precise and independent display and facilitating maintenance and repair is achieved.

In addition, according to the present invention, since a flexible display is possible, an effect of facilitating use, transportation and storage of the display device is achieved.

1 and 2 are diagrams exemplarily illustrating a configuration of colloidal particles included in a display device according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a configuration of a display device according to an exemplary embodiment of the present invention.
4A and 4B are diagrams exemplarily illustrating a configuration in which an electric field is applied to colloidal particles having different charges according to an embodiment of the present invention.
5 is a diagram illustrating a configuration of encapsulating colloidal particles included in a display device into a plurality of capsules according to an exemplary embodiment of the present invention.
6 is a diagram illustrating a configuration in which colloidal particles included in a display device are scattered in a medium according to an exemplary embodiment of the present invention.
7 and 8 are views exemplarily showing the configuration of colloidal particles interspersed in a medium according to an embodiment of the present invention.
9 is a diagram illustrating a configuration of a display device according to another exemplary embodiment of the present invention.
FIG. 10 is a diagram illustrating a result of actually implementing a display by applying an electric field to colloidal particles having charge and magnetism according to the present invention.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

A display device according to an exemplary embodiment of the present invention may implement a full color display using photonic crystal characteristics by controlling an interval between colloidal particles by applying an electric field or a magnetic field. It is done.

1 and 2 are diagrams exemplarily illustrating a configuration of colloidal particles included in a display device according to an exemplary embodiment of the present invention.

First, referring to FIG. 1, the colloidal particles 110 according to an exemplary embodiment of the present invention may be dispersed in a colloidal solvent as colloidal particles having negative or positive charges. At this time, the colloidal particles may be arranged at a predetermined interval from each other due to mutual repulsive force. The colloidal particle 110 may have a diameter of several nm to several thousand nm, but is not limited thereto.

Referring to FIG. 2, the colloidal particle 110 according to an exemplary embodiment of the present invention may include a cluster 112 formed of a plurality of nanoparticles and a charge layer 114 surrounding the outside of the cluster.

More specifically, the colloidal particles according to an embodiment of the present invention are aluminum (Al), copper (Cu), nickel (Ni), iron (Fe), silver (Ag), tin (Tin), titanium (Ti), It may be made of a metal oxide such as tungsten (W), cobalt (Co). In addition, the colloidal particles according to an embodiment of the present invention may be made of a polymer material such as PS (polystyrene), PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), PET (polyethylen terephthalate), and the like. In addition, the colloidal particles according to an embodiment of the present invention may be configured as a form in which a material having a charge on a particle or a cluster that does not have a charge, for example, silicon oxide (SiO _x ), titanium Polymers including particles coated with a metal inorganic oxide such as oxide (TiO _x ), PS (polystyrene), PE (polyethylene), PP (polypropylene), PVC (polyvinyl Chloride), PET (polyethylen terephthalate), ion exchange resin, etc. Particles coated with the material, particles whose surface is processed (or coated) by organic compounds having hydrocarbon groups, surfaces by the organic compounds having carboxylic acid groups, ester groups and acyl groups Particles processed (or coated) and negatively charged, surface-treated (coated) by complex compounds containing halogen (F, Cl, Br, I, etc.) elements, amines, thiols, phosphines coordination compounds (phosphine) By this, the surface is processed (coated), particles having a charge by forming a radical on the surface may correspond to this.

However, the configuration of the particles according to the present invention is not limited to those listed above, but within the range in which the object of the present invention can be achieved, that is, within the range in which the spacing between the particles can be controlled by an electric field. Note that it may change.

According to one embodiment of the present invention, when an electric field is applied to the cluster particles 110, the electric force in a predetermined direction acts on the colloidal particles 110 due to the electric charges of the colloidal particles 110, While the gap between the colloidal particles 110 biased toward the narrower, repulsive force acts between the colloidal particles 110 having the same charge. Accordingly, the spacing between the colloidal particles 110 may be determined according to the relative strength of the electric force due to the electric field and the repulsive force between the colloidal particles 110, and thus the colloidal particles 110 arranged at predetermined intervals may be formed of photonic crystals. Function. In other words, according to Bragg's law, since the wavelength of the light reflected from the colloidal particles 110 is determined by the distance between the colloidal particles 110, the colloidal particles 110 may be controlled by controlling the distance between the colloidal particles 110. The wavelength of the light reflected from them can be changed.

3 is a diagram illustrating a configuration of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the display device 300 according to an exemplary embodiment of the present invention may include a display unit 310 and an electric field applying unit 322, 324, and 326, and a colloid having a charge in the display unit 310. Colloidal solvent 314 in which particles 312 are dispersed may be included.

First, according to an embodiment of the present invention, the display unit 310 has a function of reflecting light of an arbitrary wavelength (that is, full color light when viewed in the visible light region) according to the intensity and direction of the applied electric field. This may be performed by controlling the distance between the colloidal particles 312 according to the strength and direction of the electric field applied to the display unit 310.

Next, according to an embodiment of the present invention, the electric field applying unit 322, 324, 326 performs a function of applying a predetermined electric field to the display unit 310, and is applied through the electric field applying unit 322, 324, 326. The intensity and direction of the electric field may be appropriately controlled according to the wavelength of light that is desired to be reflected from the display unit 310. In addition, according to an embodiment of the present invention, in order to more accurately and independently control the distance between the colloidal particles 312 included in the display unit 310, the electric field applying unit (322, 324, 326) is the display unit 310 It may be composed of a plurality of electrodes (322, 324, 326) capable of applying an electric field independently to only a portion of the region, the plurality of electrodes (322, 324, 326) is a thin film transistor (Thin Film Transistor); Can be individually controlled by a fine driving circuit such as a TFT). Meanwhile, according to an embodiment of the present invention, the electric field applying units 322, 324, and 326 may be made of a light transmissive material so as not to interfere with the progress of the light emitted from the display unit 310. It may be composed of indium tin oxide (ITO), titanium oxide (TiO ₂ ), carbon nanotubes, and other electrically conductive polymer films, which are light transmitting electrode materials.

Referring to FIG. 3, an electric field applying unit according to an embodiment of the present invention may include a first electrode 322, a second electrode 324, and a third electrode 326. First, since no electric field is applied to the space between the first electrodes 322 to which no voltage is applied, the colloidal particles 312 positioned between the first electrodes 322 may be irregularly arranged. Therefore, the display unit 310 controlled by the first electrode 322 does not display any color. Next, since the electric field corresponding to the voltage is applied to the space between the second electrode 324 to which a predetermined voltage is applied, the second electrode while the electric force due to the electric field and the repulsive force between the colloidal particles 312 are balanced The colloidal particles 312 positioned between the 324 may be regularly arranged at predetermined intervals, such that the display unit 310 controlled by the second electrode 324 may reflect light having a specific wavelength. Will be. Next, the spacing between the colloidal particles 312 positioned between the third electrode 326 to which a voltage greater than the second electrode 324 is applied is between the colloidal particles 312 positioned between the second electrodes 324. The display unit 310 controlled by the third electrode 326 may have a wavelength shorter than a specific wavelength of light reflected by the display unit 310 controlled by the second electrode 324. The light can be reflected.

4A and 4B are diagrams exemplarily illustrating a configuration in which an electric field is applied to colloidal particles having different charges according to an embodiment of the present invention.

First, referring to FIG. 4A, the display unit 410 of the display device 400 according to an exemplary embodiment of the present invention may be a colloidal particle having different charges, that is, a colloidal particle 412 having a negative charge and a colloid having a positive charge. Particles 414 may be included, and as the electric field is applied to the display unit 410, the colloidal particles 412 having a negative charge and the colloidal particles 414 having a positive charge may be regularly arranged in the opposite directions. have. For example, when the upper electrode of the electric field applying unit 420 is the positive electrode and the lower electrode is the negative electrode, the colloidal particles 412 having negative charges are arranged to move in the direction of the upper electrode, and the colloidal particles 414 having positive charges are lowered. It may be arranged to move in the direction of the electrode. In this case, the display unit 410 according to the exemplary embodiment of the present invention may reflect light of a specific wavelength on both surfaces, thereby implementing a double-sided display. Furthermore, when the amount of charge of the colloidal particles 412 having a negative charge and the colloidal particles 414 having a positive charge is different from each other, the colloidal particles having a positive charge and the interval between the colloidal particles 412 having a negative charge as an electric field is applied ( Since the intervals between the 414s may be different from each other, the display unit 410 according to the exemplary embodiment may reflect light having different wavelengths on both sides, thereby providing a display in which both sides are independently controlled. It can also be implemented.

Next, referring to FIG. 4B, the display device 400 according to the exemplary embodiment of the present invention may include a ground electrode 430 to which a ground voltage is applied between the upper electrode 422 and the lower electrode 424. It may include. According to an embodiment of the present invention, as different voltages are applied to the upper electrode 422 and the lower electrode 424, the space between the upper electrode 422 and the ground electrode 430, and the lower electrode 424 and Since the electric fields having different directions and sizes may be independently applied to the spaces between the ground electrodes 430, the first colloidal particles 416 and the lower portions positioned between the upper electrode 422 and the ground electrode 430 may be applied. The second colloidal particles 418 positioned between the electrode 424 and the ground electrode 430 can be controlled independently of each other. Accordingly, the display device 400 according to the exemplary embodiment of the present invention may reflect light having different wavelengths on both surfaces thereof, thereby implementing a display in which both surfaces are independently controlled.

5 is a diagram illustrating a configuration of encapsulating colloidal particles included in a display device into a plurality of capsules according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the colloidal particles included in the display device 500 according to the exemplary embodiment of the present invention may include a plurality of capsules 512, 514, 516, and 518 made of a light-transmissive material in a dispersed state in an arbitrary solvent. Can be encapsulated. According to an embodiment of the present invention, encapsulation of the colloidal particles may prevent direct interference such as mixing between colloidal particles included in different capsules, and thus, colloidal particles included in the display device 500. The distance between them can be controlled independently for each capsule.

5, the display device 500 according to an exemplary embodiment of the present invention may include four capsules 512, 514, 516, and 518, and may include the first capsule 512 and the second capsule. The electrodes 522, 524, 526, and 528 positioned in the capsule 514, the third capsule 516, and the fourth capsule 518 have a first voltage, a second voltage, a third voltage, and a fourth voltage, respectively. Each capsule to which electric fields of different intensities and directions are applied may reflect light of different wavelengths. Therefore, according to the display device 500 according to an exemplary embodiment of the present invention, each capsule can be implemented to be independent of each other.

On the other hand, unlike shown in Figure 5, even if the electrode and the capsule is not arranged in a one-to-one correspondence with each other and the area covered by the electrode is smaller than the capsule or one capsule is covered by two or more electrodes According to the electrode pattern, an independent display may be implemented for any region of the display unit. That is, according to one embodiment of the present invention, when an electric field is applied to a specific region in the capsule by any one of a plurality of electrodes covering the capsule, only the colloidal particles present in the specific region react to the electric field. Since the colloidal particles present in the remaining regions do not respond to the electric field, the region where the light of a specific wavelength is reflected (ie, the display region) may be determined by the electrode pattern rather than the colloidal particle size or shape.

6 is a diagram illustrating a configuration in which colloidal particles included in a display device are scattered in a medium according to an exemplary embodiment of the present invention.

Referring to FIG. 6, particles included in the display device 600 according to an exemplary embodiment of the present invention may be dispersed in a medium made of a light transmissive material in a dispersed state (ie, a colloidal state) in an arbitrary solvent. . More specifically, the colloidal particles included in the display device 600 are distributed to each other by dispersing a predetermined amount of colloidal particles in the form of droplets in a light-transmissive material 616 that is not fluid to external stimuli such as an electric field. Isolate. According to one embodiment of the present invention, by dispersing colloidal solvent in which colloidal particles are dispersed in a medium, direct interference such as incorporation between colloidal particles included in different solvent regions may be prevented. The distance between the colloidal particles included in the display device 500 may be controlled more independently.

6, the display device 500 according to an exemplary embodiment of the present invention may include a plurality of solvent regions 612 and 614 included in the medium 616. More specifically, between the colloidal particles included in the first solvent region 612 positioned between the first electrode 622 to which the first voltage is applied and between the second electrode 624 to which the second voltage is applied. The spacing between the colloidal particles included in the located second solvent region 614 may be controlled independently of each other, such that the first solvent region and the second solvent region reflect light having different wavelengths. Therefore, according to the display device 600 according to an exemplary embodiment of the present invention, it is possible to implement an independent display for each solvent region.

7 and 8 are views exemplarily showing the configuration of colloidal particles interspersed in a medium according to an embodiment of the present invention. For reference, FIGS. 7 and 8 are photographs obtained by capturing a cross section of the display device 600 mentioned in FIG. 6 with an electron microscope.

7 and 8, in a medium 820 made of a light transmissive material in a solid or gel state that is not fluid to external stimuli such as electric and magnetic fields, according to one embodiment of the invention. The colloidal particles 812 dispersed in the scattered colloidal solvent 810 can be confirmed. More specifically, according to one embodiment of the present invention, the colloidal particles having a charge is dispersed in an arbitrary colloidal solvent to generate an colloidal solution in an emulsion state, and the colloidal solution is uniform in a light-transmissive medium in the form of droplets. Can be mixed. According to an embodiment of the present invention, the colloidal particles may be an iron oxide (FeO _x ) cluster coated with a charge layer, the colloidal solvent 810 may be ethylene glycol (EG), and the medium 820 may be polydimethylsiloxane (PDMS). May be).

As mentioned above, when encapsulating or scattering the colloidal solution including the colloidal particles in the medium according to an embodiment of the present invention, it is possible to independently control the interval of the colloidal particles contained in the capsule or colloidal solvent region Thus, a more precise display can be enabled, and an effect of facilitating maintenance and repair of the display device is achieved.

On the other hand, according to an embodiment of the present invention, the display device according to an embodiment of the present invention in order to implement a continuous display by sequentially applying an electric field of different intensity and direction to the colloidal particles, between the colloidal particles It may further include a controller (not shown) that performs a function of initializing the interval. More specifically, the control unit according to an embodiment of the present invention, in sequentially applying the first electric field and the second electric field to the colloidal particles, after applying the first electric field before applying the second electric field to the colloidal particles By applying the electric field in the opposite direction to the first electric field with respect to the first electric field to perform the function of returning the interval of the colloidal particles arranged at a predetermined interval by the first electric field to the initial state. As a result, the display device according to the exemplary embodiment of the present invention can improve the display performance by suppressing afterimages.

According to another embodiment of the present invention, a display device for controlling an interval between colloidal particles by applying an electric or magnetic field to colloidal particles having charge and magnetism is provided. As the spacing between the colloidal particles having an electric charge can be controlled by an electric field, the spacing between colloidal particles having magnetic properties can be controlled by a magnetic field, and thus a detailed description thereof will be omitted. That is, according to the display device according to another exemplary embodiment of the present invention, the distance between the colloidal particles can be controlled by using not only an electric field but also a magnetic field, thereby making it possible to diversify the display control means.

Here, the colloidal particles having magnetic properties may include superparamagnetic materials such as iron (Fe) oxide, nickel (Ni) oxide, and cobalt (Co) oxide. However, the configuration of the colloidal particles of the present invention is not limited to those enumerated above, it is to be clear that can be appropriately changed within the scope that can achieve the object of the present invention.

For example, the display device according to another exemplary embodiment of the present invention applies a predetermined electric field to the display unit including the colloidal particles having charge and magnetism to implement a display appearing in a specific color on the display unit. The display on the partial region can be changed by applying a predetermined magnetic field to the partial region. For another example, a display device according to another embodiment of the present invention implements a display that appears in a specific color on a display by applying a predetermined magnetic field to a portion of the display including the colloidal particles having charge and magnetism. In this case, a predetermined electric field may be applied to the entire display unit to initialize the display on the display unit.

9 is a diagram illustrating a configuration of a display device according to another exemplary embodiment of the present invention.

Referring to FIG. 9, the display device 900 according to another embodiment of the present invention applies an electric field for applying an electric field to the display unit 910 including the colloidal particles 912 having charges and magnetisms, and the display unit 910. It may include a magnetic field applying unit 930 for applying a magnetic field to the unit 922, 924, 926 and the display unit 910. According to another embodiment of the present invention, the magnetic field applying unit 930 may include an electromagnet 932 and a coil 934 to control the strength and direction of the magnetic field applied to the display unit 910. In addition, the magnetic field applying unit 930 according to another embodiment of the present invention may be configured in the form of a magnetic pole fixedly installed on a specific portion of the display device 900, or may be manipulated by a user in an arbitrary area on the display unit 910. It may be configured in the form of a pen (pen) to apply a magnetic field to the.

According to another embodiment of the present invention, colloidal particles 912 positioned between the first electrode 922 to which no voltage is applied may be arranged irregularly, and positioned between the second electrode 924 to which the voltage is applied. The colloidal particles 912 may be regularly arranged at regular intervals due to the electric field applied to the space between the second electrodes 924, and together with the electric field applied by the third electrode 926, the magnetic field applying unit ( Colloidal particles 912 simultaneously affected by the magnetic field applied by 930 may be arranged more densely.

More specifically, referring to FIG. 9, the magnetic field applying unit 930 according to the exemplary embodiment of the present invention may include an electromagnet 932 and a coil (wound around the coil 934 capable of generating a magnetic field by an induced current). 934 may include a power source (not shown) for flowing a current. According to this configuration, the intensity of the magnetic field derived from the coil 934 and generated by the electromagnet 932 can be changed by adjusting the change in the current supplied to the coil 934, and as a result, The intensity of the magnetic field generated from one end of the magnetic field applying unit 930 approaching the display unit 910 may be adjusted for the display. Accordingly, the distance between the particles included in the display unit 910 can be adjusted in various ways, thereby realizing a full color display that emits any color on the display unit 910.

Meanwhile, referring to FIG. 9, the magnetic field applying unit 930 according to an embodiment of the present invention may not only perform a “write” function for implementing various colors of display on the display unit 910, but also the display unit 910. It may also perform a "clear" function to initialize the display implemented in the). That is, according to an embodiment of the present invention, by changing the change direction of the current flowing to the coil 934 mounted to the magnetic field applying unit 930 to set the interval between the particles contained in the display unit 910 to a specific interval As a result, the interval between the particles may be initialized, and conversely, the "write" function and the "clear" function of the magnetic field applying unit 930 may be controlled by controlling the change direction of the current flowing into the coil 934 of the magnetic field applying unit 930. You will be able to implement all of the functionality.

Therefore, when the display device 900 of FIG. 9 is implemented as the magnetic field applying unit 930, the display device 900 may be implemented as a color board capable of writing and erasing letters of various colors on a board having a background color of various colors as well as a full color display. Can be.

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FIG. 10 is a diagram illustrating a result of actually implementing a display by applying an electric field to colloidal particles having charge and magnetism according to the present invention.

For reference, in the present embodiment, as the colloidal particles, a colloidal particle including iron oxide (Fe ₃ O ₄ ; magnetite) is coated with silicon oxide (SiO _X ) having a negative charge, and the colloidal particles are colloidal solvents. It was injected into the display device while being dispersed in. In this embodiment, indium tin oxide, which is one of the light transmitting electrode materials, was used as a means for applying the electric field. In this embodiment, the positive voltage is applied to the upper electrode of the display device so that colloidal particles having negative charges are arranged to be biased toward the upper electrode.

Referring to FIG. 10, a color change was not observed when a relatively low voltage of 0V to 4V was applied, but a color change was clearly observed when a relatively high voltage of 5V to 10V was applied. In particular, as a higher voltage is applied, the color observed in the display device changes from green to blue, which increases the magnitude of the electric force applied to the colloidal particles due to the electric field, and thus closes the gap between the colloidal particles. This is because the wavelength of the light reflected from the light is shortened.

As described above, in the display device according to the present invention, the full color structure color can be realized by controlling the interval between the particles having a charge to control the wavelength of the light reflected from the particles. By independently controlling the effect of enabling more precise and independent display and facilitating maintenance and repair of the display device is achieved.

In particular, the display device according to the present invention uses a separate color filter, in contrast to conventional displays such as electronic ink, which require a color filter to implement a display composed of only one specific color and a display of another color. The utility is recognized in that it can effectively implement a display expressed in any color without having to.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents or equivalents of the claims as well as the claims to be described later will belong to the scope of the present invention. .

110: colloidal particles
112: cluster
114: charge layer
120: colloidal solvent
300: display device
310: display unit
312 colloidal particles
314 colloidal solvent
322, 324, 326: electric field applicator
400: display device
410: display unit
412 colloidal particles with negative charges
414: colloidal particles with positive charges
416: first colloidal particles
418: second colloidal particles
420: electric field applicator
422: top electrode
424: lower electrode
430 ground electrode
500: display device
512, 514, 516, 518: first capsule, second capsule, third capsule, fourth capsule
522, 524, 526, 528: electric field applicator
600: display device
610: display unit
612, 614: first solvent region, second solvent region
616 medium
622, 624: electric field applicator
810 colloidal solvent
812: colloidal particles
820: medium
900: display device
910: display unit
912 colloidal particles
914 colloidal solvent
922, 924, 926: field permitting part
930: magnetic field applicator
932: electromagnet
934: coil

Claims (39)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A display method of controlling a wavelength of light by adjusting a distance between a plurality of nanoparticles,
Providing a solvent and a plurality of nanoparticles dispersed in the solvent and having a charge of the same sign between at least one transparent first electrode and a second electrode,
Applying an electric field between the first electrode and the second electrode to electrically interact with the plurality of nanoparticles;
Controlling the distance between the plurality of nanoparticles by adjusting the intensity or polarity direction of the electric field, thereby adjusting the wavelength of light reflected from the photonic crystal formed by the plurality of controlled nanoparticles,
The spacing between the nanoparticles is maintained by the balance of a first electrical force interacting between the electric field and the nanoparticles and a second electrical force between a plurality of nanoparticles having the same sign charge,
The nanoparticles are encapsulated in a light transmissive material in a dispersed state in the solvent,
And applying an electric field between the first electrode and the second electrode and then applying an electric field in a direction opposite to the electric field to initialize the gap between the nanoparticles. The method of claim 25,
And the nanoparticles have a charge by themselves or have a charge by arbitrarily changing the properties of the nanoparticles. delete The method of claim 25,
And the nanoparticles are dispersed in a medium of the light transmissive material in a dispersed state in an arbitrary solvent. delete The method of claim 25,
A plurality of second nanoparticles having a charge of a different sign than the plurality of nanoparticles is further dispersed in the solvent,
And a distance between the plurality of nanoparticles and a plurality of second nanoparticles are differently controlled by an electric field applied between the first electrode and the second electrode. The method of claim 25,
And a ground electrode to which a ground voltage is applied between the first electrode and the second electrode.
The plurality of nanoparticles includes a plurality of first nanoparticles and a plurality of second nanoparticles partitioned based on the ground electrode.
The gap between the plurality of first nanoparticles and the plurality of second nanoparticles by applying different electric fields to the plurality of first nanoparticles and the plurality of second nanoparticles using the ground electrode. Display method characterized in that the control independently. The method of claim 25,
The first electrode is divided into a plurality of first split electrodes,
The second electrode is divided into a plurality of second split electrodes,
And an electric field is separately applied between the plurality of first divided electrodes and the plurality of second divided electrodes. A display device for controlling a wavelength of light by adjusting a distance between a plurality of nanoparticles,
At least one transparent first electrode and second electrode,
A plurality of nanoparticles dispersed in the solvent and a solvent interposed between the first electrode and the second electrode and having a charge of the same sign,
An electric field applying unit applying an electric field between the first electrode and the second electrode;
And controlling a wavelength of light reflected from a photonic crystal formed by the plurality of nanoparticles having the gap controlled by controlling the gap between the plurality of nanoparticles by controlling the intensity or polarity direction of the electric field.
The spacing between the nanoparticles is maintained by the balance of a first electrical force interacting between the electric field and the nanoparticles and a second electrical force between a plurality of nanoparticles having the same sign charge,
The nanoparticles are encapsulated in a light transmissive material in a dispersed state in the solvent,
And the controller is configured to initialize an interval between the nanoparticles by applying an electric field between the first electrode and the second electrode and then applying an electric field opposite to the electric field. delete 34. The method of claim 33,
And the nanoparticles are dispersed in a medium of a light transmissive material in a dispersed state in an arbitrary solvent. delete 34. The method of claim 33,
A plurality of second nanoparticles having a charge of a different sign than the plurality of nanoparticles is further dispersed in the solvent,
The interval between the plurality of nanoparticles and the interval between the plurality of second nanoparticles are controlled differently from each other by an electric field applied between the first electrode and the second electrode. 34. The method of claim 33,
And a ground electrode to which a ground voltage is applied between the first electrode and the second electrode.
The plurality of nanoparticles include a plurality of first nanoparticles and a plurality of second nanoparticles partitioned based on the ground electrode.
The controller may be configured to apply a different electric field to the plurality of first nanoparticles and the plurality of second nanoparticles using the ground electrode, thereby generating a gap between the plurality of first nanoparticles and a gap between the plurality of second nanoparticles. A display device characterized in that the control independently from each other. 34. The method of claim 33,
The first electrode is divided into a plurality of first split electrodes,
The second electrode is divided into a plurality of second split electrodes,
And an electric field is separately applied between the plurality of first divided electrodes and the plurality of second divided electrodes.

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