• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a field emission display device and a method of manufacturing the same, which are capable of effectively improving electron emission characteristics by uniformly aligning carbon fibers or graphite powder constituting the emitter in a predetermined direction by a magnetic field. And an emitter made of a second substrate, a cathode electrode and an anode electrode respectively formed on the substrate, and a carbon fiber or graphite powder containing a magnetic material and oriented substantially perpendicularly from the cathode electrode toward the anode electrode. The emitter is a mixture of carbon fiber or graphite powder and magnetic materials and additives such as frit and binder to produce an emitter paste, screen printing the cathode electrode, and forming a magnetic field around the printed paste to form carbon fiber or graphite powder It is made by orienting substantially perpendicular to the cathode electrode, drying and firing it. As a result, in the field emission display device, the sharp tip of the carbon fiber or graphite powder inside the emitter is exposed to the surface, thereby increasing the amount of electron emission at the same voltage, thereby improving electron emission characteristics.
    公开号:KR20000061004A
    申请号:KR1019990009722
    申请日:1999-03-22
    公开日:2000-10-16
    发明作者:최귀석；이상진；김재명；김창욱；남중우
    申请人:김순택；삼성에스디아이 주식회사；
    IPC主号:
    专利说明:

    Field emission display and method of manufacturing the same
    BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a field emission display device and a manufacturing method thereof, and more particularly, to uniformly orient carbon fibers or graphite powder constituting an emitter in a predetermined direction by a magnetic field to effectively improve electron emission characteristics. A field emission display device and a method of manufacturing the same.
    In general, a field emission display (FED) emits electrons from an emitter formed on a cathode electrode by using a quantum mechanical tunneling effect, and impinges the emitted electrons on an anode electrode coated with a phosphor by applying a predetermined image. It is a display device for implementing.
    Here, the emitter for emitting electrons includes a spindt type emitter having a sharp tip that emits electrons due to a voltage difference applied to the cathode electrode and the gate electrode, and to the cathode electrode and the anode electrode without forming the gate electrode. There is a plane type emitter which emits electrons by the difference in voltage applied.
    The spin type emitter is manufactured by forming an insulating film and a gate electrode on one surface of a cathode electrode, etching the gate electrode and the insulating film, and stacking an electron-emitting material such as molybdenum or silicon into the etched space.
    Such a spin type emitter has a very small radius of curvature at the tip of several hundreds of ohms so that electron emission can be smoothly achieved, thereby maximizing the local electric field.
    However, since the spin type emitter is required to form an emitter tip in units of micrometers, it is difficult to form a uniform emitter as a whole, and the manufacturing cost is high, and it has disadvantages in large area.
    As a result, a flat type emitter having a flat structure without a tip structure has been devised by a simpler manufacturing method than a spin type emitter.
    Materials for forming such a surface type emitter include diamond, diamond like carbon, graphite powder, carbon fiber and the like.
    Here, the carbon fiber has an advantage of good electron emission characteristics, but since the individual carbon fibers are irregularly distributed in the emitter and the sharp ends of the carbon fibers are not directed to the surface, there is a disadvantage that they do not exhibit good electron emission characteristics. .
    This is because the sharper end of the carbon fiber is directed toward the surface, thereby increasing the amount of electron emission at the same voltage.
    However, the emitter made of carbon fiber is usually prepared by cutting and crushing carbon fiber to powder, and then adding frit and a binder to the powder to prepare an emitter paste, and then printing it on one surface of the cathode electrode.
    As a result, the individual carbon fibers inside the emitter are aligned horizontally or inclined at a predetermined angle instead of vertically aligned from the cathode to the anode, which has the disadvantage of degrading electron emission characteristics as the emitter. .
    In addition, since the graphite powder has a plate-like microstructure, most of the graphite powder is disposed in a layer parallel to the substrate in an emitter mixed with frit and a binder, and thus has a disadvantage of deteriorating electron emission characteristics.
    Therefore, the present invention is designed to solve the above problems, an object of the present invention is to orient the individual carbon fibers or graphite powder in the emitter vertically from the cathode toward the anode electrode to effectively improve the electron emission characteristics of the emitter An object of the present invention is to provide a field emission display device and a method of manufacturing the same.
    1 is a cross-sectional view of a field emission display device according to the present invention.
    2-3 are schematic diagrams schematically showing a cross section of the emitter of FIG.
    4 is a process flowchart sequentially showing a method of manufacturing a field emission display device according to the present invention;
    5 is a schematic representation of an emitter schematically showing the stage of orientation of the emitter.
    In order to achieve the above object, the present invention,
    Forming a fluorescent film on one surface of the first and second substrates sealed at predetermined intervals, a cathode electrode formed on one of the substrates, and a surface formed on the other of the substrates and facing the cathode electrode; A field emission display device comprising an anode electrode and an emitter formed on the cathode to emit electrons by forming an electric field, and including a magnetic material and an electron emission material oriented perpendicularly from the cathode toward the anode electrode. do.
    In addition, the present invention to achieve the above object,
    An electrode forming step of forming a cathode electrode and an anode electrode by depositing a conductive film on one surface of the first substrate and the second substrate, a fluorescent film forming step of coating a phosphor on one surface of the anode electrode, an electron-emitting material, a magnetic substance and a frit And an emitter paste manufacturing step of preparing an emitter paste by mixing an additive such as a binder, a thick film printing step of screen printing the emitter paste on a cathode electrode, and applying a magnetic field to the printed emitter paste to obtain an electron-emitting material. An orientation step of oriented substantially perpendicular to the cathode electrode, an emitter curing step of drying and firing the emitter paste, and a sealing step of integrally sealing the first substrate and the second substrate. It provides a manufacturing method.
    The electron-emitting material is made of carbon fiber or graphite powder coated on the surface of the magnetic material such as Fe, Ni, Fe 2 O 3 and Co or contained therein, which is a vertical direction from the cathode electrode toward the anode electrode by the magnetic field Orientation to improve the electron emission characteristics.
    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    1 is a cross-sectional view of a field emission display device according to the present invention, wherein the field emission display device is disposed on the first substrate 2 and the second substrate 4 and the first substrate 2 which are disposed to face each other at a predetermined interval. And a cathode electrode 6 arranged in a predetermined line shape, and an anode electrode 8 arranged in a line shape perpendicular to the second substrate 4 so as to perpendicularly intersect the pattern of the cathode electrode 6.
    An emitter 10 made of an electron-emitting material is positioned on the cathode electrode 6, and green, blue, and red fluorescent films 12 are formed on one surface of the anode electrode 8 facing the emitter 10. ) Is located.
    As a result, when a predetermined voltage pattern is applied to the cathode electrode 6 and the anode electrode 8, an electric field is formed according to the voltage difference applied to the cathode electrode 6 and the anode electrode 8, and the electrons are emitted from the emitter 10. (Shown in dashed lines), and the emitted electrons collide with the fluorescent film 12 to excite the phosphor to implement a predetermined image.
    At this time, the emitter 10 is made of an electron-emitting material in the form of a powder containing a magnetic material to form a structure in which the individual electron-emitting material in the emitter 10 is oriented in a predetermined direction by a magnetic field.
    2 is a schematic view showing a cross section of the emitter 10, wherein the electron-emitting material is made of a fine columnar carbon fiber 22 containing a magnetic body 20. As shown in FIG. The carbon fiber 22 may be coated with a magnetic body 20 on the surface thereof, or may contain the magnetic body 20 in a fiber structure.
    The magnetic body 20 is a material that is magnetized when a magnetic field is applied, which is contained in the carbon fiber 22 to magnetize the carbon fiber 22 when the magnetic field is formed. As a result, the individual carbon fibers 22 may be aligned in a direction in which both ends thereof are aligned according to the magnetic field direction, and the carbon fibers 22 are preferably perpendicular from the cathode electrode 6 toward the anode electrode 8. Oriented structure.
    3 is a schematic diagram schematically showing a cross section of the emitter 10 according to another embodiment, wherein the electron-emitting material is composed of a plate-like graphite powder 24 containing a magnetic body 20. The graphite powder 24 may be coated with a magnetic body 20 on the surface thereof, or may contain a magnetic body inside the powder.
    The graphite powder 24 containing the magnetic body 20 may also be magnetized upon application of a magnetic field, so that the graphite powder 24 may be aligned parallel to the direction of the magnetic field. Preferably, the graphite powder 24 may move the anode electrode 8 at the cathode electrode 6. Towards a vertically oriented structure.
    As described above, the magnetic body 20 may magnetize the electron-emitting material to orient in a predetermined direction, and Fe, Ni, Fe 2 O 3, and Co are preferable for the magnetic body 20.
    The carbon fiber 22 or graphite powder 24 in the emitter 10 is thus oriented vertically from the cathode electrode 6 toward the anode electrode 8, the sharp tip of which is exposed to the surface to face the vacuum. do. Therefore, while using the same material as the existing emitter can increase the amount of electron emission at the same voltage, it can effectively improve the electron emission characteristics.
    Next, a method of manufacturing a field emission display device according to the present invention will be described.
    4 is a process flowchart sequentially illustrating a method of manufacturing a field emission display device according to the present invention. As shown in the drawing, a method of manufacturing a field emission display device includes a cathode electrode by depositing a conductive film on one surface of a first substrate and a second substrate. The anode electrode was formed, the phosphor was coated on one surface of the anode electrode, an emitter paste was prepared by mixing an electron-emitting material, a magnetic substance, and an additive such as frit and a binder, and then the emitter paste was thick-film printed on the cathode electrode. By forming a magnetic field around the printed emitter paste, the electron-emitting material is uniformly oriented, the emitter paste is dried and fired to cure the emitter, and the first and second substrates are integrally sealed.
    A method of manufacturing the field emission display device as described above will be described below with reference to FIG. 1.
    In order to fabricate the field emission display device, first, indium tin oxide is sputtered on one surface of the second substrate 4 made of transparent glass, and then etched to form a line-shaped anode electrode 8. .
    The green, blue, and red phosphors are screen-printed and heat-treated to a predetermined shape on the surface of the anode electrode 8 to form a fluorescent film 12. Subsequently, the paste for partition 14 is printed in parallel between the phosphors and heat-treated.
    Indium tin oxide or silver is sputtered or screen printed onto one surface of the first substrate 2, which is another transparent glass material, to form a cathode electrode 6 in the form of a line. Then, the paste for partition 14 is printed and heat-treated between the cathode electrodes 6 using the screen printing method.
    Subsequently, magnetic bodies such as Fe, Ni, Fe 2 O 3, and Co are plated or coated on the surface of the carbon fiber, which is an electron-emitting material, to attach the magnetic body. This process may be performed by adding a magnetic material such as Fe, Ni, Fe 2 O 3 and Co to the starting material of the carbon fiber to contain the magnetic material in the internal structure of the carbon fiber.
    Next, the carbon fibers containing the magnetic material are cut and crushed at a predetermined interval to be powdered. And the emitter paste which has a specific viscosity is manufactured by mixing additives, such as a frit and a binder, with carbon fiber powder.
    The prepared emitter paste is printed on one surface of the cathode in a predetermined pattern. At this time, the paste printing is made of a thick film process including a conventional screen printing method, the thick film process using a powder in this way is advantageous to ensure the uniformity of the emitter, it is easy to form a pattern, and more than the emitter manufacturing process Has the advantage of simplicity.
    As shown in FIG. 5, the magnetic field B is formed at the upper and lower portions of the printed paste 30. At this time, the direction of the magnetic field B is set to be the vertical direction from the cathode electrode 6 toward the anode electrode 8 as shown by the dotted line.
    As a result, the carbon fibers 22 containing the magnetic body 20 are magnetized by the magnetic field and vertically aligned along the direction of the magnetic field.
    The emitter 10 is completed by applying a magnetic field to orient the carbon fibers 22 in the paste 30 vertically, and then drying and firing the paste 20.
    Here, the electron-emitting material may be made of graphite in addition to the carbon fiber, and the manufacturing process of the emitter mainly composed of graphite is made in the same process, in addition to providing graphite instead of carbon fiber in the above-described method, detailed description Omit.
    Subsequently, a seal frit 16 is applied to the edges of the first substrate 2 and the second substrate 4 except for the portion to be an exhaust port. At this time, the first substrate 2 and the second substrate 4 are disposed so that the line-shaped anode electrode 8 and the cathode electrode 6 cross each other perpendicularly, and are sealed by heat treatment while applying an appropriate pressure.
    A vacuum pump is connected to the exhaust port to form the inside of the substrate as a vacuum of 10 −4 to 10 −10 Torr, and then seal the exhaust port.
    As a result, the field emission display device according to the present embodiment orients the electron-emitting material inside the emitter substantially vertically from the cathode toward the anode electrode, thereby exposing the pointed tip of the electron-emitting material to the surface to effectively expose the electron-emitting characteristics. It can be improved.
    Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.
    As described above, the field emission display device according to the present invention includes a magnetic material in the electron-emitting material forming the emitter to orient the electron-emitting material substantially vertically by forming a magnetic field. As a result, the sharp tip of the electron-emitting material is exposed to the surface, thereby maximizing the amount of electron emission at the same voltage, thereby effectively improving the electron-emitting characteristics.
    权利要求:
    Claims (10)
    [1" claim-type="Currently amended] First and second substrates sealed at predetermined intervals;
    A cathode electrode formed on any one of the substrates;
    An anode electrode formed on the other one of the substrates and forming a fluorescent film on one surface facing the cathode electrode;
    And an emitter formed on the cathode to emit electrons by forming an electric field, the emitter comprising an electron-emitting material containing a magnetic material.
    [2" claim-type="Currently amended] First and second substrates sealed at predetermined intervals;
    A cathode electrode formed on any one of the substrates;
    An anode electrode formed on the other one of the substrates and forming a fluorescent film on one surface facing the cathode electrode;
    And an emitter formed on the cathode to emit electrons by forming an electric field, the emitter comprising a magnetic material, the emitter being made of an electron-emitting material oriented substantially perpendicularly from the cathode toward the anode.
    [3" claim-type="Currently amended] The field emission display of claim 1, wherein the emitter comprises carbon fibers coated with a magnetic material on a surface thereof.
    [4" claim-type="Currently amended] The field emission display device of claim 1 or 2, wherein the emitter includes carbon fibers containing magnetic material therein.
    [5" claim-type="Currently amended] The field emission display device of claim 1, wherein the emitter comprises graphite powder coated with a magnetic material on a surface thereof.
    [6" claim-type="Currently amended] The field emission display device of claim 1, wherein the emitter comprises graphite powder containing magnetic material therein.
    [7" claim-type="Currently amended] An electrode forming step of depositing a conductive film on one surface of the first substrate and the second substrate to form a cathode electrode and an anode electrode, respectively;
    Forming a phosphor film on one surface of the anode electrode;
    An emitter paste manufacturing step of preparing an emitter paste by mixing an electron-emitting material, an additive such as a magnetic substance, and a frit and a binder;
    A thick film printing step of screen printing the emitter paste onto the cathode electrode;
    An orientation step of forming a magnetic field around the printed emitter paste to orient the electron-emitting material perpendicularly to the cathode electrode;
    An emitter curing step of drying and firing the emitter paste;
    And a sealing step of integrally sealing the first substrate and the second substrate.
    [8" claim-type="Currently amended] The method of claim 7, wherein the aligning is performed in a direction perpendicular to the emitter such that the direction of the magnetic field is directed from the cathode electrode to the anode electrode.
    [9" claim-type="Currently amended] The method of claim 7, wherein the electron emission material is selected from the group consisting of carbon fiber and graphite.
    [10" claim-type="Currently amended] The method of claim 7, wherein the magnetic material is selected from the group consisting of Fe, Ni, Fe 2 O 3, and Co.
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    同族专利:
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    KR100346540B1|2002-07-26|
    US6720729B1|2004-04-13|
    JP2000285837A|2000-10-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-03-22|Application filed by 김순택, 삼성에스디아이 주식회사
    1999-03-22|Priority to KR1019990009722A
    2000-10-16|Publication of KR20000061004A
    2002-07-26|Application granted
    2002-07-26|Publication of KR100346540B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019990009722A|KR100346540B1|1999-03-22|1999-03-22|A field emission display and method of manufacturing the same|
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