KR20090029489A - Color magnetic display pixel panel - Google Patents

Color magnetic display pixel panel Download PDF

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Publication number
KR20090029489A
KR20090029489A KR1020070094778A KR20070094778A KR20090029489A KR 20090029489 A KR20090029489 A KR 20090029489A KR 1020070094778 A KR1020070094778 A KR 1020070094778A KR 20070094778 A KR20070094778 A KR 20070094778A KR 20090029489 A KR20090029489 A KR 20090029489A
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KR
South Korea
Prior art keywords
magnetic
material layer
magnetic material
display panel
light
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Application number
KR1020070094778A
Other languages
Korean (ko)
Inventor
조승래
Original Assignee
삼성전자주식회사
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Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020070094778A priority Critical patent/KR20090029489A/en
Priority to PCT/KR2008/000768 priority patent/WO2008100042A1/en
Priority to US12/031,728 priority patent/US20080198109A1/en
Publication of KR20090029489A publication Critical patent/KR20090029489A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/091—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect based on magneto-absorption or magneto-reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element

Abstract

A color magnetic display pixel panel is provided to use an existing liquid crystal display panel. Rear and front transparent substrates(110,150) face each other. A magnetism material layer(130) is filled between the rear and front transparent substrates. A sub pixel electrode(120) is partly formed on an inner surface of the rear transparent substrate. A color filter(140) is arranged on an inner surface of the front transparent substrate. A common electrode(125) is arranged in a surface of the color filter. A conductive spacer(123) is arranged on a side of the magnetism material layer to shield the magnetism material layer. The conductive spacer electrically connects the sub pixel electrode and the common electrode.

Description

Color magnetic display panel {Color magnetic display pixel panel}

The present invention relates to a color magnetic display panel, and more particularly, to a color magnetic display panel using an optical shutter made of a magnetic material layer.

Currently, liquid crystal display (LCD) panels and plasma display panels (PDP) are mainly used as flat panel display panels. In addition, OLED (Organic Light Emitting Diode) has been studied as the next flat panel display panel.

Since the liquid crystal display (LCD) panel is not self-luminous, it is necessary to use an optical shutter that transmits / blocks the light emitted from the backlight unit or external light. As is known, the optical shutter used in the liquid crystal display panel consists of two polarizing plates and a liquid crystal layer disposed between the two polarizing plates. Here, the polarizing plates on the light source side of the polarizing plates on both sides of the liquid crystal layer are called polarizers, and the polarizing plates on the opposite side thereof are called analyzers. The detector and the polarizer have their respective polarizing axes 90 degrees to each other. On the other hand, the liquid crystal layer only functions to turn the polarization of light.

In such a structure, non-polarized light from the back light unit (BLU) passes through the polarizer, and only polarization in one direction is selected to reach the detector through the liquid crystal layer. Here, whether or not the light passing through the polarizer passes through the tester is determined by how much the liquid crystal layer returns the polarization of the light. Since the polarizer axis is perpendicular to each other in the tester and the polarizer, when the liquid crystal returns a little amount of light, the light corresponding to the returned amount passes through the tester. In addition, if the liquid crystal returns no light at all, the light cannot pass through the tester. One of the important issues required in LCDs is to secure a wide viewing angle, and the liquid crystal modes used to solve this problem are expensive in manufacturing. Therefore, research is being conducted to secure a wide viewing angle in a low-cost liquid crystal mode. In addition, the conventional LCD has a low response speed, such as motion blur (motion blur).

On the other hand, the plasma display panel does not require an optical shutter as a self-luminous type, but has a problem in that power consumption is large and heat is generated. In addition, OLEDs are also self-luminous and do not require optical shutters. OLEDs are still in the development stage, which is problematic in that manufacturing costs are high and their lifetime is not long enough.

An object of the present invention is to provide a color magnetic display panel of a new concept that implements an optical shutter using a magnetic material rather than a liquid crystal.

In addition, another object of the present invention to provide an electronic device employing the color magnetic display panel.

A color magnetic display panel according to a preferred embodiment of the present invention includes pixels consisting of red, green, blue, and black subpixels, each subpixel having internal magnetic moments arranged in one direction when an external magnetic field is applied. A magnetic material layer; A subpixel electrode for applying a magnetic field to the magnetic material layer; A common electrode electrically connected to the subpixel electrode; And a control circuit for switching a current flow between the subpixel electrode and the common electrode.

According to the present invention, the light of the magnetic field component parallel to the direction in which the magnetic moments in the magnetic material layer are arranged is reflected by the magnetic material layer, and the light of the vertical magnetic field component is transmitted through the magnetic material layer.

Here, the thickness of the magnetic material layer is preferably larger than the magnetic attenuation length of the magnetic material layer.

For example, the magnetic material layer may have a structure in which magnetic particles made of a conductive magnetic core and a transparent insulating shell surrounding the magnetic core are embedded in a transparent insulating medium.

The one magnetic core preferably forms one single magnetic domain.

The magnetic core may be made of, for example, ferromagnetic, paramagnetic or superparamagnetic material.

In particular, the magnetic core is, for example, cobalt, iron, iron oxide, nickel, Co-Pt alloy, Fe-Pt alloy, titanium, aluminum, barium, platinum, sodium, strontium, magnesium, dysprosium, manganese, gadolinium, silver, It may be made of any one material selected from copper and chromium or an alloy thereof.

In addition, the magnetic material layer may be made of a magnetic polymer film having conductivity.

According to the present invention, the subpixel may be disposed on a side of the magnetic material layer and may further include a conductive spacer electrically connecting the subpixel electrode and the common electrode.

The common electrode may be a plate-like sheet electrically connected to the conductive spacer or a wire having a lattice structure.

For example, the subpixel electrode, the common electrode, and the conductive spacer may be made of any one material of aluminum, copper, silver, platinum, gold, barium, chromium, sodium, strontium, magnesium, and iodine doped polyacetylene.

In this case, a first hole is formed in an area of the subpixel electrode facing the magnetic material layer so that light can pass through the subpixel electrode, and a plurality of wires extending in a direction in which a current flows is formed. It can be formed in the hole.

Preferably, a light transmissive material is formed in the first hole region between the wires.

In addition, the second hole is preferably formed in the region of the common electrode facing the magnetic material layer so that light can pass through the common electrode.

In this case, a light transmissive material may be formed in the second hole area of the common electrode.

In addition, the subpixel electrode and the common electrode may be made of a transparent conductive material.

According to the present invention, each of the subpixels further includes a color filter, color filters of the red, green, and blue subpixels are disposed above or below the magnetic material layer, and color filters of the black subpixels are the magnetic filter. It may be disposed under the material layer.

In addition, the magnetic display panel according to the present invention may further include a rear transparent substrate and a front transparent substrate disposed on the rear and front surfaces of the magnetic display panel so as to surround the rear and front surfaces of the subpixels.

In addition, the magnetic display panel according to the present invention may further include an absorption type polarizer disposed on any one surface of the optical surface from the magnetic material layer to the outer surface of the front transparent substrate.

In addition, the magnetic display panel according to the present invention may further include an antireflective coating formed on at least one of the optical surfaces from the magnetic material layer to the outer surface of the front transparent substrate.

According to the present invention, one common back transparent substrate, front transparent substrate and common electrode are shared by all the pixels, and the magnetic material layer, the subpixel electrode, the color filter and the control circuit are arranged one for each subpixel.

In addition, the magnetic display panel according to the present invention may further include a reflector formed on at least one surface of the optical surface from the bottom of the color filter to the outer surface of the rear transparent substrate.

The reflection plate is formed in an array of hybrid surfaces in which two kinds of curved surfaces are mixed, and the central portion of the hybrid curved surface has a convex parabolic surface having a central axis of symmetry, and a circumference around the central portion of the hybrid curved surface has a central axis of symmetry. It may have the form of a concave parabolic surface having a focus on and extending from the central portion.

Meanwhile, according to the present invention, dyes or color absorbing particles may be further mixed in the magnetic material layer.

For example, the color absorbing particles may be composed of a core made of a dielectric and a shell made of a metal.

According to the present invention, color absorbing particles having different radius ratios of the core and the shell may be distributed in the magnetic material layer.

On the other hand, the electronic device according to another type of the present invention may employ a magnetic display panel having the above-described structure.

In the case of the color magnetic display panel according to the present invention, an optical shutter for controlling the transmission / blocking of light can be implemented with much fewer components than in the conventional liquid crystal display panel. Therefore, it is possible to manufacture a color display panel that can implement a desired color simply and inexpensively compared to the conventional liquid crystal display panel.

In addition, since the color magnetic display panel according to the present invention can use most of the existing manufacturing process of the liquid crystal display panel, it is possible to utilize the current production line of the liquid crystal display panel as it is.

The color magnetic display panel according to the present invention is easy to manufacture not only in a small area but also in a large area. Therefore, the color magnetic display panel according to the present invention can be widely applied to electronic devices of various sizes in which an image is provided, such as a TV, a PC, a notebook, a mobile phone, a PMP, a game machine, and the like.

1 is a cross-sectional view schematically showing the structure of one sub-pixel 100 of a color magnetic display panel according to the present invention. Referring to FIG. 1, one subpixel 100 of the color magnetic display panel according to the present invention is filled between the rear and front transparent substrates 110 and 150 and the rear and front transparent substrates 110 and 150 disposed to face each other. The magnetic material layer 130, the subpixel electrode 120 partially formed on the inner surface of the back transparent substrate 110, the color filter 140 disposed on the inner surface of the front transparent substrate 150, and the color. The common electrode 125 disposed on the surface of the filter 140 and the side of the magnetic material layer 130 to seal the magnetic material layer 130 to seal the subpixel electrode 120 and the common electrode 125. ) And a conductive spacer 123 for electrically connecting). Here, one common back and front transparent substrates 110 and 150 and the common electrode 125 are shared by all the pixels 100 of the color magnetic display panel according to the present invention. In FIG. 1, the common electrode 125 is disposed on the surface of the color filter 140 and the subpixel electrode 120 is disposed on the inner surface of the rear transparent substrate 110. Positions of the common electrode 125 may be interchanged.

Meanwhile, a control circuit 160 for switching a current flow between the subpixel electrode 120 and the common electrode 125 may be formed adjacent to the magnetic material layer 130 on the inner surface of the back transparent substrate 110. have. For example, the control circuit 160 may use a thin film transistor (TFT) commonly used in a liquid crystal display panel. In the case of using the thin film transistor, for example, when a voltage is applied to the gate electrode of the thin film transistor, a current flows between the subpixel electrode 120 and the common electrode 125 while the thin film transistor is turned on.

In addition, a vertical partition wall 170 is formed between the common electrode 125 and the rear transparent substrate 110 along the edge of the subpixel. The partition wall 170 serves to completely seal the inside between the rear and front transparent substrates 110 and 150 together with the conductive spacer 123 from the outside.

In addition, a black matrix 145 is formed between the common electrode 125 and the front transparent substrate 150 in an area facing the control circuit 160, the partition wall 170, and the conductive spacer 123. The black matrix 145 serves to make the control circuit 160, the partition wall 170, and the conductive spacer 123 invisible from the outside. Although FIG. 1 illustrates that the black matrix 145 and the color filter 140 are disposed between the common electrode 125 and the front transparent substrate 150, the black matrix 145 and the color filter 140 may be disposed on the outer surface of the front transparent substrate 150. It is possible.

Although not specifically illustrated in FIG. 1, in order to prevent glare due to reflection and scattering of external light, an antireflective coating is formed on at least one surface of the optical surface from the magnetic material layer 130 to the front transparent substrate 150. You may. For example, referring to the enlarged view at the top of FIG. 1, the surface A1 between the magnetic material layer 130 and the common electrode 125 and the surface A2 between the common electrode 125 and the color filter 140 are shown. The antireflective coating may be formed on at least one of the surface A3 between the color filter 140 and the front transparent substrate 150 and the top surface A4 of the front transparent substrate 150. Instead of the antireflective coating, it is also possible to arrange absorbing polarizers which only absorb light in a particular polarization direction.

In addition, in order to appropriately recycle the external light passing through the magnetic material layer 130, a mirror or a transflective mirror may be formed on at least one of the optical surfaces from the magnetic material layer 130 to the rear transparent substrate 110. It may be. For example, referring to the enlarged view at the bottom of FIG. 1, the surface C1 between the magnetic material layer 130 and the subpixel electrode 120 and the surface between the subpixel electrode 120 and the back transparent substrate 110 are described. A mirror or a transflective mirror may be formed on at least one surface of (C2) and the bottom surface C3 of the back transparent substrate 110. When the mirror is formed on the entire surface, the color magnetic display panel according to the present invention can use only external light for display. When the mirror is formed only on a part of the surface, or when the transflective mirror is formed, both the external light and the light from the backlight unit can be used for the display.

FIG. 2 exemplarily illustrates structures of the subpixel electrode 120, the conductive spacer 123, and the common electrode 125 illustrated in FIG. 1. Referring to FIG. 2, the subpixel electrode 120 faces the bottom surface of the magnetic material layer 130 shown in FIG. 1, and the common electrode 125 faces the top surface of the magnetic material layer 130. The spacer 123 is disposed on one side of the magnetic material layer 130 to electrically connect the subpixel electrode 120 and the common electrode 125.

The subpixel electrode 120, the conductive spacer 123, and the common electrode 125 may be, for example, aluminum (Al), copper (Cu), silver (Ag), platinum (Pt), gold (Au), or barium ( It may be made of an opaque metal having a small resistance such as Ba), chromium (Cr), sodium (Na), strontium (Sr), magnesium (Mg), and the like. In addition to the metal, it is also possible to use a conductive polymer such as iodine-doped polyacetylene as the material of the subpixel electrode 120, the conductive spacer 123, and the common electrode 125.

In the case of using an opaque material, as shown in FIG. 2, light may pass through the subpixel electrode 120 and the common electrode 125 to allow light to pass through the subpixel electrode 120 and the common electrode 125. Holes 121 and 126 are formed in regions facing the magnetic material layer 130, respectively. At this time, in order to easily apply a magnetic field to the magnetic material layer 130, a plurality of relatively small holes (121) are formed side by side in the sub-pixel electrode 120, extending in the direction of the current flow A plurality of wires 122 are left between the holes 121. On the other hand, one relatively large hole 126 having the same size as the magnetic material layer 130 may be formed in the common electrode 125.

On the other hand, when a current is applied to the wires 122 formed as described above, the magnetic fields cancel each other and do not exist in the space between the wires 122. Further, farther away from the wire 122, a parallel and uniform magnetic field is formed. Therefore, it is preferable that the magnetic material layer 130 does not penetrate the space between the wires 122. In addition, the magnetic material layer 130 may be disposed at a predetermined distance from the wire. To this end, a light transmissive material may be further filled in the holes 121 formed between the wires 122 of the subpixel electrode 120 and the holes 126 of the common electrode 125, respectively. In addition, a light-transmitting material having a predetermined thickness may be interposed between an interface between the subpixel electrode 120 and the magnetic material layer 130 and an interface between the common electrode 125 and the magnetic material layer 130. By doing so, a uniform magnetic field can be applied to the magnetic material layer 130 as a whole, and the magnetic material layer 130 can be prevented from penetrating into a region having weak or almost no magnetic field.

However, as a material of the subpixel electrode 120 and the common electrode 125, a conductive material transparent to visible light, such as ITO, may be used. In this case, it is not necessary to separately form the holes in the subpixel electrode 120 and the common electrode 125. In addition, recently, a technology for coating a metal very thinly to several nm or less has been developed. When the conductive metal is formed to a thickness less than or equal to the skin depth of the metal, light transmission is possible. Accordingly, the subpixel electrode 120 and the common electrode 125 may be formed by thinly coating the conductive metal to a thickness smaller than the surface depth.

3 to 5 schematically illustrate an arrangement of a plurality of subpixels 100 and various structures of a common electrode 125 common to the plurality of subpixels 100 in the color magnetic display panel 300 according to the present invention. As shown.

First, referring to FIG. 3, the color magnetic display panel 300 according to a preferred embodiment of the present invention may be composed of a plurality of subpixels two-dimensionally arranged on one common rear transparent substrate 110. Sub-pixels having color filters of different colors may form one pixel. For example, as shown in FIG. 3, a subpixel 100RD having a red color filter, a subpixel 100GR having a green color filter, a subpixel 100BL having a blue color filter, and a black color The subpixel 100BK having the filter may form one pixel 300P.

In addition, the subpixels 100 of the color magnetic display panel 300 according to the present invention have one common common electrode 125. In the case of FIG. 3, the common electrode 125 is a transparent electrode made of a transparent conductive material such as ITO. In this case, it is not necessary to form a hole for the passage of light in the common electrode 125. In this structure, current flows from the common electrode 125 to the subpixel electrode 120 of the corresponding subpixel through the conductive spacer 123 only when the control circuit 160 disposed in each subpixel is turned on. do. Here, since the current flows along a very large area in the common electrode 125, while the current flows along a very narrow area in the subpixel electrode 120, the current density in the subpixel electrode 120 is the common electrode 125. It is much greater than the current density in. Therefore, the magnetic material layer 130 is only affected by the subpixel electrode 120 and is hardly affected by the common electrode 125.

4 and 5 illustrate a case in which the common electrode 125 is made of an opaque metal or a conductive polymer. In FIG. 4, as shown in FIG. 2, holes are formed in the common electrode 125 to transmit light at positions corresponding to one subpixel. In FIG. 5, a larger hole 127 is formed in the common electrode 125 to transmit light at each position corresponding to one pixel of four subpixels.

However, according to the present invention, the structure of the common electrode 125 is not limited only to the shapes shown in FIGS. 3 to 5. 3 to 5 illustrate that the common electrode 125 is a plate-like sheet, for example, may be formed of a wire of a mesh or grid structure. The common electrode 125 may be electrically connected to the conductive spacers 123 of the respective subpixels, regardless of the shape thereof. 3 to 5 illustrate that the common electrode 125 and the subpixel electrode 120 are on different substrates, the common electrode 125 and the subpixel electrode 120 formed of a wire of mesh or lattice structure. May be formed on the same substrate.

6 illustrates a schematic structure of the magnetic material layer 130 according to the present invention, and FIG. 7 is a cross-sectional view of the exemplary magnetic material layer 130 shown in FIG. 6. 6 and 7, the magnetic material layer 130 is, for example, a plurality of magnetic particles 21 made of a conductive magnetic core, a transparent insulating medium 22 without agglomeration or electrical contact with each other. It may be a structure embedded in. 6 and 7 illustrate that the magnetic particles 21 in the magnetic material layer 130 are densely distributed for convenience. In practice, however, the magnetic particles 21 are densely packed in the magnetic material layer 130. In order to prevent the magnetic particles 21 made of conductive magnetic cores from agglomerating or electrically contacting each other, the magnetic particles 21 are conductive magnetic cores 21a and transparent nonmagnetic, insulating shells surrounding them. 21b). In addition, the region between the magnetic particles 21 may also be filled with a transparent insulating dielectric material having a nonmagnetic similarity to the insulating shell 21b.

The magnetic material layer 130 may be formed by, for example, mixing the conductive magnetic cores 21a with a transparent insulating material in a paste state, and then applying a thin layer on the subpixel electrode 120 and curing the same. Alternatively, the magnetic particles 21 having a core-shell structure are immersed in a solution and then cured by thin spin coating or deep coating on the subpixel electrode 120. The magnetic material layer 130 may be formed. Recently, a conductive magnetic polymer film having magnetic properties has been developed and sold, and the magnetic material layer 130 may be formed by directly attaching the conductive magnetic polymer film on the subpixel electrode 120. In this case, it is suitable that the magnetic polymer film is formed to have a thickness of, for example, 100 nm or less so that the magnetic polymer film can operate in the same manner as the magnetic core of a single magnetic domain. In addition, the conductive magnetic core and the insulating transparent nonmagnetic core are mixed and immersed in a single solution, and then spin-cured or dip-coated thinly on the subpixel electrode 120 to cure the magnetic material layer 130. It is also possible to form). If the magnetic particles 21 may be present in the magnetic material layer 130 in a state where they are not agglomerated or electrically contacted with each other, other methods may be used.

8 and 9 illustrate exemplary structures of the magnetic particles 21 having a core-shell structure constituting the magnetic material layer 130. As shown in FIGS. 8 and 9, the magnetic particles 21 may be composed of a core 21a made of a conductive magnetic material and insulating shells 21b and 21b` surrounding the core 21a. . Here, as a material that can be used as the core 21a of the magnetic particles 21, any material among ferromagnetic, paramagnetic or superparamagnetic materials may be used as long as it has both a conductor and a magnetic property. For example, use may be made of paramagnetic metals or alloys such as titanium, aluminum, barium, platinum, sodium, strontium, magnesium, dysprosium, manganese and gadolinium, or diamagnetic metals or alloys such as silver and copper, or Neil temperature (Neel). It is also possible to use an antiferromagnetic metal such as chromium that turns paramagnetic above a temperature. It is also possible to use ferromagnetic metals or alloys thereof, such as cobalt, iron, nickel or alloys comprising the same, to have superparamagnetic properties. In order for the ferromagnetic material to have superparamagnetic properties, the volume of the magnetic core 21a may be smaller than that of a single magnetic domain. In addition, as long as it has properties as a conductor and a magnetic material, materials such as dielectrics, semiconductors, polymers, and the like may be used in addition to metals. In addition, ferrimagnetic materials having low conductivity but very high magnetic susceptibility may be used. Examples of such materials include MnZn (Fe 2 O 4 ) 2 , MnFe 2 O 4 , and Fe 3 O 4. And iron oxides such as Fe 2 O 3 and Sr 8 CaRe 3 Cu 4 O 24 .

The diameter of this core 21a should be small enough that one core 21a can form a single magnetic domain. Therefore, the diameter of the core 21a of the magnetic particles 21 can be from several nm to several tens nm depending on the material used. For example, the diameter of the core 21a may vary depending on the material used, but may be about 1 nm to 100 nm.

On the other hand, the role of the shells 21b and 21b` is to prevent the adjacent cores 21a from sticking together or directly touching each other, thereby preventing electrical contact between the cores 21a. To this end, as shown in FIG. 8, a shell 21b made of a non-magnetic transparent insulating dielectric material such as SiO 2 or ZrO 2 may surround the core 21a. In addition, as shown in FIG. 9, a shell 21b ′ made of a surfactant in the form of a polymer may surround the core 21a. Here, the surface active agent in the polymer form should be transparent, insulating and nonmagnetic. The thickness of the shells 21b and 21b 'is sufficient so that the adjacent cores 21a do not conduct with each other.

10 schematically shows the orientation of magnetic moments in the magnetic material layer 130 when no external magnetic field is applied. When no external magnetic field is applied, the overall magnetic moments in the magnetic material layer 130 are randomly oriented in various directions as indicated by arrows in FIG. 10. In Fig. 10, '·' represents a magnetic moment in the + x direction on the x-y plane, and 'x' represents a magnetic moment in the -x direction on the x-y plane. 10, the magnetic moments in the magnetic material layer 130 are randomly oriented not only in the x-y plane but also in the vertical direction (ie, the -z direction). Therefore, when no external magnetic field is applied, the total magnetization in the magnetic material layer 130 is zero (M = 0).

11 illustrates a case where an external magnetic field is applied around the magnetic material layer 130. The magnetic field applying means for applying an external magnetic field around the magnetic material layer 130 is the subpixel electrode 120 disposed on the bottom surface of the magnetic material layer 130. In particular, when the subpixel electrode 120 is formed of an opaque metal, an external magnetic field is applied around the magnetic material layer 130 through the wires 121 of the subpixel electrode 120 extending along the direction of current flow. do. For example, as shown in FIG. 11, when a current is applied to the subpixel electrode 120 so that a current flows in the -y direction along the wires 121, the magnetic material layer 130 is magnetized in the -x direction. . That is, all of the magnetic moments in the magnetic material layer 130 are oriented in the -x direction.

Hereinafter, the principle of light transmission / blocking in the magnetic material layer 130 having the above-described structure will be described.

The magnetic field of the electromagnetic wave incident on the magnetic material layer 130 may be decomposed into a component H ⊥ and a horizontal component H || perpendicular to the magnetization direction of the magnetic material layer 130. When a component H || parallel to the magnetization direction is incident on the magnetic material layer 130, an induced magnetic moment is generated by interacting with magnetic moments oriented in the magnetization direction. The induced magnetic moments thus change with time as the amplitude of the magnetic field of the horizontal component H || changes with time. As a result, according to the general principle of electromagnetic radiation, electromagnetic waves are generated by time-varying induced magnetic moments. The electromagnetic waves thus generated can propagate in all directions. However, electromagnetic waves traveling in the magnetic material layer 130 (that is, electromagnetic waves traveling in the -z direction) are attenuated by the magnetic material layer 130. If the thickness t of the magnetic material layer 130 is larger than the magnetic decay length, a concept similar to the skin depth length of the electric field, the magnetic material layer (among the electromagnetic waves generated by the induced magnetic moment) Most of the electromagnetic waves traveling to 130 are attenuated, and only the electromagnetic waves traveling in the + z direction remain. Accordingly, the component H || parallel to the magnetization direction may be considered to be reflected by the magnetic material layer 130.

On the other hand, when the component H 수직 perpendicular to the magnetization direction is incident on the magnetic material layer 130, the vertical component H 하지 does not interact with the magnetic moment, and thus no induced magnetic moment occurs. As a result, the component H 수직 perpendicular to the magnetization direction passes through the magnetic material layer 130 without attenuation.

As a result, in the magnetic field of the electromagnetic wave incident on the magnetic material layer 130, the component H || parallel to the magnetization direction is reflected by the magnetic material layer 130, while the component H perpendicular to the magnetization direction is reflected. ⊥ ) is to pass through the magnetic material layer 130. Thus, the light energy ( S || = E || × H || ) associated with the magnetic field of the component parallel to the magnetization direction is reflected by the magnetic material layer 130 and associated with the magnetic field of the component perpendicular to the magnetization direction. Light energy ( S ⊥ = E ⊥ × H ⊥ ) passes through the magnetic material layer 130.

As shown in FIG. 10, when no external magnetic field is applied to the magnetic material layer 130, the magnetic moments in the magnetic material layer 130 are randomly oriented not only in the xy plane but also in the depth direction (ie, the -z direction). It is. Therefore, all light incident on the magnetic material layer 130 to which the external magnetic field is not applied is reflected. On the other hand, as shown in FIG. 11, when an external magnetic field is applied to the magnetic material layer 130, the magnetic moments in the magnetic material layer 130 are aligned in one direction. Accordingly, among the light incident on the magnetic material layer 130, the light of the polarization component related to the magnetic field component parallel to the magnetization direction is reflected by the magnetic material layer 130, and the polarization associated with the magnetic field component perpendicular to the magnetization direction. The light of the component is transmitted through the magnetic material layer 130. In this regard, the magnetic material layer 130 may function as an optical shutter that blocks light when no external magnetic field is applied and transmits light when the external magnetic field is applied.

On the other hand, in order for the magnetic material layer 130 to function as an optical shutter, the magnetic material layer 130 must have a thickness capable of sufficiently attenuating electromagnetic waves traveling into the magnetic material layer 130. That is, as described above, the thickness of the magnetic material layer 130 should be greater than the magnetic attenuation length of the magnetic material layer 130. In particular, when the magnetic material layer 130 is formed of a magnetic core dispersed in a transparent medium, a sufficient number of magnetic cores must exist in the magnetic material layer 130 along a path through which light travels. For example, assuming that the magnetic material layer 130 is formed by stacking the same layers on the xy plane in which the magnetic core is uniformly distributed in a single layer in the z direction, the magnetic core required along the path of light traveling in the -z direction. The number n of may be given by the following equation.

n ≥ s / d

Where s is the magnetic attenuation length of the magnetic core at the wavelength of the incident light and d is the diameter of the magnetic core. For example, when the diameter of the magnetic core is 7 nm and the magnetic attenuation length of the magnetic core is 35 nm at the wavelength of incident light, five magnetic cores are required along the path of light. Therefore, when the magnetic material layer 130 is formed of a magnetic core dispersed in a transparent medium, the magnetic material layer 130 such that at least n magnetic cores exist in the thickness direction of the magnetic material layer 130 in consideration of the density of the magnetic core. ) Thickness can be determined.

12 to 14 show simulation results for confirming the characteristics of the magnetic material layer 130.

First, FIG. 12 is a graph showing the intensity (A / m) of the time-varying magnetic field passing through the magnetic material layer 130 in the state where an external magnetic field is applied, and FIG. 13 is an enlarged graph of a portion of FIG. 12. 12 and 13 show results obtained when titanium is used as the magnetic material of the magnetic material layer 130 and the incident light has a wavelength of 550 nm. Titanium has a magnetic susceptibility of about 18 × 10 −5 and an electrical conductivity of about 2.38 × 10 6 S (Siemens) at room temperature of 20 ° C., as is known. 12 and 13, in the case of a magnetic field perpendicular to the magnetization direction of the magnetic material layer 130, the magnetic material layer 130 passes through the magnetic material layer 130 without attenuation loss even if the thickness of the magnetic material layer 130 increases. . On the other hand, in the case of light parallel to the magnetization direction of the magnetic material layer 130, the attenuation is greatly attenuated and the amplitude becomes close to zero at about 60 nm. Therefore, when titanium is used as the magnetic material of the magnetic material layer 130, it is appropriate that the thickness of the magnetic material layer 130 is about 60 nm or more.

14 is a ratio of the polarization cancellation ratio (ie, the ratio of the transmittance of light having a magnetic field perpendicular to the magnetization direction to the transmittance of light having a magnetic field parallel to the magnetization direction) (contrast ratio CR). Graph showing absolute values. For example, if "W1" is light to be transmitted and "W2" is light that should not be transmitted, the polarization cancellation ratio CR may be defined as (W1 / W2). In the case of the magnetic material layer 130, "W1" is S ⊥ = E ⊥ × H ,, and "W2" is S || = E || × H || to be. The graph of FIG. 14 shows that as the thickness of the magnetic material layer 130 becomes thicker, the polarization cancellation ratio increases.

Hereinafter, the operation of one sub-pixel 100 of the color magnetic display panel according to the preferred embodiment of the present invention using the magnetic material layer 130 having the above-described characteristics as an optical shutter will be described in detail.

First, FIG. 15 illustrates a case where no current flows to the subpixel electrode 120 when the control circuit 160 is in an OFF state. In this case, since the magnetic field is not applied to the magnetic material layer 130, the magnetic moments in the magnetic material layer 130 are oriented in a random direction. Therefore, as described above, all light incident on the magnetic material layer 130 is reflected. As shown in FIG. 15, light A and B incident from the backlight unit (not shown) to the magnetic material layer 130 through the rear transparent substrate 110 are all reflected by the magnetic material layer 130. do. In addition, external light A 'and B' incident on the magnetic material layer 130 through the front transparent substrate 150 are also reflected by the magnetic material layer 130.

FIG. 16 shows a case where current flows to the subpixel electrode 120 when the control circuit 160 is in the ON state. In this case, since an external magnetic field is applied to the magnetic material layer 130 through the subpixel electrode 120, all magnetic moments in the magnetic material layer 130 are oriented in one direction. Therefore, as described above, the light of the polarization component (hereinafter, the light of the parallel polarization component) associated with the magnetic field component parallel to the magnetization direction of the magnetic material layer 130 is reflected by the magnetic material layer 130, The light of the polarization component (hereinafter, the light of the vertical polarization component) related to the magnetic field of the component perpendicular to the magnetization direction is transmitted through the magnetic material layer 130.

For example, as shown in FIG. 16, of light incident from the backlight unit (not shown) to the magnetic material layer 130 through the rear transparent substrate 110, the light A of the vertically polarized component is the magnetic Passes through the material layer 130 contributes to the image formation. On the other hand, the light B of parallel polarization components is reflected by the magnetic material layer 130. The reflected light B of the parallel polarization component is, for example, reflected by a mirror (not shown) provided under the backlight unit, and then is diffused into light in a non-polarized state using a diffuser plate (not shown). Can be changed. Through this process, it is possible to recycle the reflected parallel polarized light component.

In addition, among the external light incident on the magnetic material layer 130 through the front transparent substrate 150, the light A ′ of the vertically polarized component passes through the magnetic material layer 130 as it is. In this case, as described above with reference to FIG. 1, when a transflective mirror is formed on at least one of the optical surfaces from the magnetic material layer 130 to the rear transparent substrate 110, the outside of the vertical polarization component The light A 'may be reflected again and used to form an image. On the other hand, the light B ′ of the parallel polarization component incident on the magnetic material layer 130 through the front transparent substrate 150 is reflected on the surface of the magnetic material layer 130. The reflected light B 'does not contribute to the image shape, but may make the observer's eyes tired. In order to prevent such a problem, at least one of the optical surface from the magnetic material layer 130 to the front transparent substrate 150, an absorption type polarizing plate for absorbing only the light (B ') of the parallel polarization component May be disposed or form an antireflective coating.

By using the operation of one sub-pixel 100 described above, it is possible to implement a specific color in one pixel of the color magnetic display panel according to the present invention. Referring to FIG. 17, one pixel of the color magnetic display panel according to the present invention includes four subpixels 100RD, 100GR, 100BL, and 100BK having red, green, blue, and black color filters. In a conventional display panel such as a liquid crystal display panel, one pixel is typically composed of red, green, and blue subpixels, and black is realized by blocking and absorbing light. However, in the case of the color magnetic display panel according to the present invention, since the magnetic material layer 130 serving as the optical shutter functions only to reflect or transmit light but does not absorb light, an additional subpixel having a black filter is required. Do. Here, in the case of the subpixel 100BK having the black filter, the light reflected from the magnetic material layer 130 should not pass through the black filter. Therefore, as shown in FIG. 17, in the sub-pixel 100BK having the black filter, the color filter 140 is preferably located under the magnetic material layer 130. In FIG. 17, although the color filter 140 is disposed between the magnetic material layer 130 and the subpixel electrode 120 in the subpixel 100BK having the black filter, the subpixel electrode 120 and the rear transparent layer are disposed. The color filter 140 may be disposed between the substrates 110. The color filter of the black subpixel 100BK may be made of, for example, a material that absorbs light in the same way as the black matrix.

Hereinafter, referring to FIGS. 17 to 25, one of the color magnetic display panel according to the present invention consisting of four sub-pixels 100RD, 100GR, 100BL, and 100BK, each having a color filter of red, green, blue, and black, will be described. An operation for implementing a desired color in the pixel will be described. For each of the subpixels shown in FIGS. 17 to 25, the control circuit 160 is not shown for convenience.

First, FIG. 17 illustrates a case where all four subpixels 100RD, 100GR, 100BL, and 100BK are in an OFF state. In this case, all the light incident on the color magnetic display panel is reflected by the magnetic material layer 130 of each subpixel. As described above, in the case of subpixels 100RD, 100GR, and 100BL having color filters of red, green, and blue, each color filter 130 is disposed between the front transparent substrate 150 and the magnetic material layer 130. It is arranged. Therefore, the light reflected from the magnetic material layer 130 of the subpixels 100RD, 100GR, and 100BL having the color filters of red, green, and blue is the color filter 130 of each of the subpixels 100RD, 100GR, and 100BL. ) To have a specific color. For example, the light reflected from the magnetic material layer 130 of the red subpixel 100RD is red. Light reflected from the magnetic material layer 130 of the green subpixel 100GR is green, and light reflected from the magnetic material layer 130 of the blue subpixel 100BL is blue. Therefore, when all four sub-pixels 100RD, 100GR, 100BL, and 100BK are in the OFF state, one pixel of the color magnetic display panel according to the present invention appears entirely white.

FIG. 18 illustrates a case in which the red, green, and blue subpixels 100RD, 100GR, and 100BL are all in an ON state, and only the black subpixel 100BK is in an OFF state. In this case, of the external light A ', B' incident on the red, green, and blue subpixels 100RD, 100GR, and 100BL, the external light A 'of the vertically polarized component is formed of each magnetic material layer ( 130). On the other hand, the external light B 'of the parallel polarization component is reflected on the surface of each magnetic material layer 130. As described above, the reflected external light (B ') component can be removed using an antireflective coating or an absorbing polarizer. Further, of the light A, B incident on the red, green, and blue subpixels 100RD, 100GR, 100BL from a backlight unit (not shown), the light A of the vertically polarized light component is each magnetic material. Passing through the layer 130, parallel polarized light B is reflected by each magnetic material layer 130.

Therefore, only the light A of the vertical polarization component emitted from the backlight unit passes through the magnetic material layer 130 and the color filter 140 of each of the red, green, and blue subpixels 100RD, 100GR, and 100BL. It will have a color. On the other hand, the external light A 'and B' incident on the black sub-pixel 100BK and the light A and B of the backlight unit are both reflected by the magnetic material layer 130. As a result, when the red, green, and blue subpixels 100RD, 100GR, 100BL are in the ON state, and the black subpixel 100BK is in the OFF state, one pixel of the color magnetic display panel according to the present invention appears to be entirely white. . In comparison with the case of FIG. 17, in the case of FIG. 18, since white is formed using the light A emitted from the backlight unit, much brighter white can be obtained.

FIG. 19 illustrates a case in which the red, green, and blue subpixels 100RD, 100GR, and 100BL are all in an OFF state, and only the black subpixel 100BK is in an ON state. In this case, the external lights A 'and B' incident on the red, green, and blue subpixels 100RD, 100GR, and 100BL are all reflected by the respective magnetic material layers 130. On the other hand, of the external light A ', B' incident on the black subpixel 100BK, the external light A 'of the vertical polarization component passes through the magnetic material layer 130 of the black subpixel 100BK. Then absorbed by the color filter 140. On the other hand, the external light B 'of the parallel polarization component is reflected on the surface of the magnetic material layer 130.

In addition, light A and B incident on the red, green, and blue subpixels 100RD, 100GR, and 100BL from a backlight unit (not shown) are all reflected by the respective magnetic material layers 130. The light A and B incident on the black subpixel 100BK from the backlight unit are absorbed by the color filter 140.

In this case, the reflected external light A ', B' passes through the color filter 130 of each of the red, green, and blue subpixels 100RD, 100GR, 100BL, thereby forming a weak white color. On the other hand, in the black sub-pixel 100BK, light is absorbed to have a strong black color. As a result, a strong black color appears on a weak white background as a whole, so that one pixel of the color magnetic display panel according to the present invention appears black as a whole. For this reason, in the color magnetic display panel according to the present invention, black may be realized even when only external light is present without a backlight unit.

20 illustrates a case in which the green, blue, and black subpixels 100GR, 100BL, and 100BK are all in an OFF state, and the red subpixel 100RD is in an ON state. In this case, the external light A ', B' incident on the green, blue and black subpixels 100GR, 100BL, 100BK are all reflected at the respective magnetic material layer 130. Meanwhile, of the external light A 'and B' incident on the red subpixel 100RD, the external light A 'of the vertical polarization component passes through the magnetic material layer 130 of the red subpixel 100RD. In addition, the external light B ′ of the parallel polarization component is reflected on the surface of the magnetic material layer 130.

Further, the light A and B incident on the green and blue subpixels 100GR and 100BL from the backlight unit are both reflected by the respective magnetic material layers 130 and the light incident on the black subpixel 100BK ( Both A and B are absorbed by the color filter 140. The light A of the polarization component perpendicular to the light A and B incident on the red subpixel 100RD from the backlight unit passes through the magnetic material layer 130 of the red subpixel 100RD. The light B of the polarization component thus performed is reflected by the magnetic material layer 130.

Even in this case, the reflected external light A ', B' passes through the color filter 140 of each of the red, green, and blue subpixels 100RD, 100GR, and 100BL, thereby forming a weak white color. However, since the external light A 'of the polarization component perpendicular to the external light A' and B 'incident on the red subpixel 100RD passes through the magnetic material layer 130, it does not contribute to white formation. . On the other hand, the light A of the vertical polarization component emitted from the backlight unit passes through the color filter 130 of the red sub-pixel 100RD to have a strong red color. Therefore, a strong red color appears on a weak white background as a whole, so that one pixel of the color magnetic display panel according to the present invention appears red in total.

18 to 20, the external light A ′ of the polarization component perpendicular to the external light A ′ and B ′ is used to remove the magnetic material layer 130 of the subpixel in the ON state. Since it passes through as it is, external light is wasted. 21 and 22 further include a reflector 135 for reflecting and recycling external light A ′ of the vertical polarization component in a portion of the lower portion of the magnetic material layer 130. In particular, referring to an enlarged view of the lower portion of FIGS. 21 and 22, the reflector plate 135 may be formed in an array of hybrid curved surfaces in which two types of curved surfaces are mixed. For example, the central portion of one hybrid curved surface of the reflector plate 135 may have the form of a convex parabolic surface having an axis of symmetry in the center. The periphery around the center of the reflective plate 135 may be a concave curved surface, and may have a concave parabolic surface extending from the center and having a focus on the axis of symmetry. Then, most of the external light A 'reflected by the reflector 135 travels in a direction perpendicular to the surface of the color magnetic display panel.

Here, FIG. 21 illustrates a case where all of the red, green, and blue subpixels 100RD, 100GR, and 100BL are in an ON state and the black subpixel 100BK is in an OFF state, as shown in FIG. In this case, as described with reference to FIG. 18, one pixel of the color magnetic display panel according to the present invention is generally white. Compared with the case of FIG. 18, in the case of FIG. 21, the light reflected from the reflector 135 of each of the red, green, and blue subpixels 100RD, 100GR, and 100BL together with the light A emitted from the backlight unit. Since white is formed using light A ', brighter white can be obtained. In particular, since the external light A 'reflected by the reflector 135 is reflected in a direction substantially perpendicular to the surface of the color magnetic display panel, most of the external light A' is opposite to the color magnetic display panel. May be provided to an observer. Therefore, as compared with the case where the external light is reflected at the same angle as the incident angle, further improved luminance can be obtained.

FIG. 22 illustrates a case where all of the green, blue, and black subpixels 100GR, 100BL, and 100BK are in an OFF state and the red subpixel 100RD is in an ON state, as shown in FIG. In this case, as described with reference to FIG. 20, one pixel of the color magnetic display panel according to the present invention appears to be entirely red. In comparison with the case of FIG. 20, in the case of FIG. 22, red is used by using external light A ′ reflected from the reflector 135 of the red sub-pixel 100RD together with the light A emitted from the backlight unit. By forming, a stronger red color can be obtained.

23 through 25 show that the color filter 140 of the red, green, and blue subpixels 100RD, 100GR, and 100BL is the same as the color filter 140 of the black subpixel 100BK. The case where it is located below is shown. 23 to 25, each color filter 140 is disposed between the magnetic material layer 130 of the red, green, blue, and black subpixels 100RD, 100GR, 100BL, and 100BK and the subpixel electrode 120. Although shown, each color filter 140 may be disposed between the subpixel electrode 120 and the rear transparent substrate 110. 23 to 25 illustrate that the reflector 135 is disposed under the rear transparent substrate 110 of the red, green, and blue subpixels 100RD, 100GR, and 100BL, respectively. The reflector 135 may be disposed below. However, the reflective plate 135 may not be disposed in the black subpixel 100BK.

In the embodiments of FIGS. 17 to 22 described above, white always exists as a background color. However, in the case of the present embodiment shown in Figs. 23 to 25, when all the subpixels 100RD, 100GR, 100BL, 100BK are in the OFF state, the color magnetic display panel according to the present invention looks like a mirror. Accordingly, when black is to be reproduced, the black subpixel 100BK is turned on as shown in FIG. 23, and the remaining subpixels 100RD, 100GR, and 100BL are turned off. In addition, when white is to be reproduced, the black subpixel 100BK is turned off and the remaining subpixels 100RD, 100GR, and 100BL are turned on as shown in FIG. When red is to be reproduced, as shown in FIG. 25, the red subpixel 100RD is turned ON, and the remaining subpixels 100GR, 100BL, 100BK are turned OFF.

In the case of the color magnetic display panel according to the embodiments of the present invention described above, the case in which the magnetic material layer 130 and the color filter 140 exist as separate layers has been described. However, according to another embodiment of the present invention, the magnetic material layer may simultaneously perform the function of the color filter. FIG. 26 illustrates a structure of a magnetic material layer 130 ′ according to another embodiment of the present invention.

Referring to FIG. 26, the magnetic material layer 130 ′ according to the present embodiment includes, for example, a plurality of magnetic particles 21 and a plurality of color absorbing particles 23 embedded in one transparent insulating medium 22. It may be a structure. In FIG. 26, for convenience, the magnetic particles 21 and the color absorbing particles 23 in the magnetic material layer 130 ′ are densely distributed. In practice, however, the magnetic particles 21 and the color absorbing particles 23 are very densely packed in the magnetic material layer 130 ′. Here, the magnetic particles 21 made of a conductive magnetic core have the same structure as described above. That is, as shown in an enlarged view in FIG. 26, each magnetic particle 21 is composed of a conductive core and a core-shell composed of a transparent insulating shell 21b surrounding the magnetic core 21a. -shell) structure.

Meanwhile, the color absorbing particles 23 may also be formed in a core-shell structure, as shown in an enlarged view in FIG. 26. However, the core-shell structure of the color absorbing particles 23 is different in that it consists of a core 23a made of a dielectric and a shell 23b made of a metal. For example, gold, silver or aluminum is mainly used as the shell 23b of the color absorbing particles 23, and SiO 2 may be mainly used as the core 23a of the color absorbing particles 23. Such core-shell structured color absorbing particles 23 are widely used in filters for absorbing wavelengths in specific bands. As is generally known, when light is incident on a thin metal film formed on a dielectric, surface plasmon resonance occurs at the interface between the dielectric and the metal film to absorb light of a specific wavelength band. At this time, the resonance wavelength is independent of the size of the core-shell structure, and is determined only by the ratio of the radii of the core 23a and the shell 23b. However, in order for surface plasmon resonance to occur, it is suitable that the diameter of the color absorbing particle 14 is about 50 nm or less.

Although the same type of color absorbing particles 23 are distributed in the magnetic material layer 130 ′ in FIG. 26, various types of color absorbing particles 23 may be mixed and distributed. For example, in order to realize green color, the color absorbing particles absorbing the red band light and the color absorbing particles absorbing the blue band light may be mixed together in the magnetic material layer 130 ′. In addition, when red is to be realized, the color absorbing particles absorbing the wavelength of the green band and the color absorbing particles absorbing the light of the blue band may be mixed together and distributed in the magnetic material layer 130 ′. Accordingly, the color absorbing particles 23 having various ratios of radii of the core 23a and the shell 23b may be distributed in the magnetic material layer 130 ′.

In addition, the color absorbing particles 23 do not necessarily have to be spherical, and may be in the form of nanorods. Even if the color absorbing particles 23 are in the form of nanorods, light of a specific wavelength band may be absorbed by surface plasmon resonance, in which case the resonance wavelength is determined by the aspect ratio of the nanorods. Therefore, in order to achieve a desired color, the color absorbing particles 23 having various aspect ratios and the nano absorbing particles 23 having various radial ratios of the core and the shell have one magnetic material layer 130 ′. It may be mixed inside.

The magnetic material layer 130 ′, for example, immerses the core-shell structured magnetic particles 21 and the color absorbing particles 23 in one solution, and then spins it thinly on the subpixel electrode 120. It may be formed by curing by coating or dip coating. In addition, as long as the magnetic particles 21 may exist in the magnetic material layer 130 ′ without being aggregated or electrically in contact with each other, various other methods may be used. Here, the size of the color absorbing particles 23 is preferably smaller than or similar to the size of the magnetic particles 21. This is because when the size of the color absorbing particles 23 is too large than the size of the magnetic particles 21, the polarization separation performance by the magnetic particles 21 may be deteriorated.

Distributing the color absorbing particles 23 in the magnetic material layer 130 ′ is to allow the magnetic material layer 130 ′ to simultaneously perform the function of the color filter. Therefore, the magnetic material layer 130 ′ may be embodied in another form if the function of the color filter can be simultaneously performed without affecting the functions of the magnetic particles 21. For example, the magnetic material layer 130 ′ may be formed by distributing the core-shell structured magnetic particles 21 in a liquid or paste color filter medium and curing the core particles. In addition, the magnetic material layer 130 ′ may be formed by immersing the core-shell structured magnetic particles 21 in a solution together with a color filter dye and coating the thin particles on the subpixel electrode 120 to cure. .

FIG. 27 schematically shows the structure of one sub-pixel 100 'of a color magnetic display panel according to an embodiment of the present invention having the above-described magnetic material layer 130' that simultaneously performs the function of a color filter. have. Compared with the subpixel 100 shown in FIG. 1, the subpixels 100 ′ shown in FIG. 27 are all identical in configuration, except that the color filter 140 is omitted and the magnetic material layer 130 ′ is removed. The only difference is that they have the function of a color filter together.

When a desired color is to be implemented in a pixel composed of the subpixels 100 ′ shown in FIG. 27, the operation is performed according to the method described with reference to FIGS. 23 to 25. That is, when all the subpixels are in the OFF state, the color magnetic display panel looks like a mirror. When black is to be reproduced, the black subpixel is turned on and the remaining subpixels are turned off. When white is to be reproduced, the black subpixel is turned off and the remaining subpixels are turned on. When red is to be reproduced, the red subpixel may be turned ON, and the remaining subpixels may be turned OFF.

To date, exemplary embodiments have been described and illustrated in the accompanying drawings in order to facilitate understanding of the present invention. However, it should be understood that such embodiments are merely illustrative of the invention and do not limit it. And it is to be understood that the invention is not limited to the illustrated and described description. This is because various other modifications may occur to those skilled in the art.

1 is a cross-sectional view schematically showing the structure of one sub-pixel of a color magnetic display panel according to the present invention.

FIG. 2 exemplarily illustrates structures of a subpixel electrode, a conductive spacer, and a common electrode of one subpixel of the color magnetic display panel according to the present invention shown in FIG. 1.

3 schematically illustrates a structure of a subpixel array and a common electrode of a color magnetic display panel according to an exemplary embodiment of the present invention.

4 schematically illustrates a structure of a subpixel array and a common electrode of a color magnetic display panel according to another exemplary embodiment of the present invention.

FIG. 5 schematically illustrates a subpixel arrangement and a structure of a common electrode of a color magnetic display panel according to another exemplary embodiment of the present invention.

FIG. 6 exemplarily shows a schematic structure of a magnetic material layer of one subpixel of the color magnetic display panel according to the present invention shown in FIG. 1.

FIG. 7 is a cross-sectional view of the magnetic material layer illustrated in FIG. 6.

FIG. 8 exemplarily shows a structure of magnetic particles used in the magnetic material layer shown in FIG. 6.

9 exemplarily shows another structure of magnetic particles used in the magnetic material layer shown in FIG. 6.

10 schematically shows the orientation of the magnetic moments in the magnetic material layer when no external magnetic field is applied.

11 schematically shows the orientation of the magnetic moments in the magnetic material layer when an external magnetic field is applied.

12 and 13 are graphs showing the transmission of a magnetic field in the magnetic material layer.

14 is a graph showing a transmission ratio of polarization parallel to polarization perpendicular to the magnetization direction in the magnetic material layer.

FIG. 15 is a cross-sectional view schematically showing the operation when the sub-pixel of the color magnetic display panel according to the present invention is in the OFF state.

Fig. 16 is a cross-sectional view schematically showing the operation when the subpixel of the color magnetic display panel according to the present invention is in the ON state.

17 to 22 show examples of implementing colors using sub-pixels having colors of red, green, blue, and black in the color magnetic display panel according to the present invention.

23 to 25 illustrate examples of implementing colors using sub-pixels having colors of red, green, blue, and black in a color magnetic display panel according to another exemplary embodiment of the present invention.

26 schematically illustrates the structure of a magnetic material layer according to another embodiment of the present invention.

FIG. 27 is a cross-sectional view schematically illustrating a structure of a color magnetic display panel according to another exemplary embodiment of the present invention using the magnetic material layer illustrated in FIG. 26.

※ Explanation of code about main part of drawing ※

21 ..... magnetic particles 22 ..... transparent medium

23 ..... Color Absorbent Particles

100 .... one subpixel on the magnetic display panel

110,150 .... transparent substrate 120 .... subpixel electrode

121,126,127 .... hole 122 .... wire

123 .... conductive spacer 125 .... common electrode

130 .... magnetic layer 140 .... color filter

145 .... Black Matrix 160 .... Control Circuit

170 .... Bulk 200 .... Backlight Unit

300 ... magnetic display panel

Claims (27)

With pixels of red, green, blue, and black subpixels, Each subpixel is: A magnetic material layer in which internal magnetic moments are arranged in one direction when an external magnetic field is applied; A subpixel electrode for applying a magnetic field to the magnetic material layer; A common electrode electrically connected to the subpixel electrode; And And a control circuit for switching a current flow between the subpixel electrode and the common electrode. The method of claim 1, And the light of the magnetic field component parallel to the direction in which the magnetic moments are arranged in the magnetic material layer is reflected by the magnetic material layer, and the light of the vertical magnetic field component passes through the magnetic material layer. The method of claim 1, And the thickness of the magnetic material layer is greater than the magnetic attenuation length of the magnetic material layer. The method of claim 3, wherein The magnetic material layer has a structure in which magnetic particles made of a conductive magnetic core and a transparent insulating shell surrounding the magnetic core are embedded in a transparent insulating medium. The method of claim 4, wherein And wherein the magnetic core forms one single magnetic domain. The method of claim 4, wherein The magnetic core is made of a ferromagnetic, paramagnetic or superparamagnetic material. The method of claim 6, The magnetic core is selected from cobalt, iron, iron oxide, nickel, Co-Pt alloy, Fe-Pt alloy, titanium, aluminum, barium, platinum, sodium, strontium, magnesium, dysprosium, manganese, gadolinium, silver, copper and chromium. Magnetic display panel, characterized in that made of any one material or alloy thereof. The method of claim 3, wherein The magnetic material layer is a magnetic display panel comprising a magnetic polymer film having conductivity. The method of claim 1, The subpixel may further include a conductive spacer disposed on a side surface of the magnetic material layer and electrically connecting the subpixel electrode and the common electrode. The method of claim 9, The common electrode is a magnetic sheet, characterized in that the plate-like sheet electrically connected to the conductive spacer or a wire of a grid structure. The method of claim 9, The subpixel electrode, the common electrode, and the conductive spacer are made of any one material of aluminum, copper, silver, platinum, gold, barium, chromium, sodium, strontium, magnesium, and iodine doped polyacetylene. panel. The method of claim 11, wherein In order to allow light to pass through the subpixel electrode, a first hole is formed in an area of the subpixel electrode facing the magnetic material layer, and a plurality of wires extending in a direction in which current flows are formed in the first hole. Magnetic display panel characterized in that. The method of claim 12, And a light-transmissive material is formed in the first hole area between the wires. The method of claim 11, wherein And a second hole formed in a region of the common electrode facing the magnetic material layer so that light can pass through the common electrode. The method of claim 14, The transparent display panel is formed in the second hole region of the common electrode. The method of claim 1, And the subpixel electrode and the common electrode are made of a transparent conductive material. The method according to any one of claims 1 to 16, Each of the subpixels further includes a color filter, wherein the color filters of the red, green, and blue subpixels are disposed above or below the magnetic material layer, and the color filters of the black subpixels are below the magnetic material layer. Magnetic display panel, characterized in that arranged. The method of claim 17, And a rear transparent substrate and a front transparent substrate disposed on the rear and front surfaces of the magnetic display panel so as to surround the rear and front surfaces of the sub-pixels, respectively. The method of claim 18, And an absorption type polarizer disposed on any one of the optical surfaces from the magnetic material layer to the outer surface of the front transparent substrate. The method of claim 18, And an antireflective coating formed on at least one of the optical surfaces from the magnetic material layer to the outer surface of the front transparent substrate. The method of claim 18, One common back transparent substrate, front transparent substrate and common electrode are shared by all pixels, and the magnetic material layer, the subpixel electrode, the color filter, and the control circuit are arranged one for each subpixel. panel. The method of claim 18, And a reflector formed on at least one of the optical surfaces from the bottom of the color filter to the outer surface of the rear transparent substrate. The method of claim 22, The reflection plate is formed in an array of hybrid surfaces in which two kinds of curved surfaces are mixed, and the central portion of the hybrid curved surface has a convex parabolic surface having a central axis of symmetry, and a circumference around the central portion of the hybrid curved surface has a central axis of symmetry. And a concave parabolic surface extending from the center and having a focus on the magnetic display panel. The method according to any one of claims 1 to 16, The magnetic display panel, characterized in that the dye or color absorbing particles are mixed in the magnetic material layer. The method of claim 24, The color absorbing particle is a magnetic display panel, characterized in that consisting of a core made of a dielectric and a shell made of a metal. The method of claim 25, The magnetic display panel, wherein the color absorbing particles having different radius ratios of the core and the shell are distributed in the magnetic material layer. An electronic device employing the magnetic display panel according to any one of claims 1 to 16.
KR1020070094778A 2007-02-16 2007-09-18 Color magnetic display pixel panel KR20090029489A (en)

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KR1020070094778A KR20090029489A (en) 2007-09-18 2007-09-18 Color magnetic display pixel panel
PCT/KR2008/000768 WO2008100042A1 (en) 2007-02-16 2008-02-11 Color magnetic display pixel panel
US12/031,728 US20080198109A1 (en) 2007-02-16 2008-02-15 Color magnetic display pixel panel

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180005324A (en) * 2016-07-05 2018-01-16 삼성디스플레이 주식회사 Display apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180005324A (en) * 2016-07-05 2018-01-16 삼성디스플레이 주식회사 Display apparatus

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