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WO2007011117A1 - Dispositif d’émission de champ - Google Patents

Dispositif d’émission de champ Download PDF

Info

Publication number
WO2007011117A1
WO2007011117A1 PCT/KR2006/002535 KR2006002535W WO2007011117A1 WO 2007011117 A1 WO2007011117 A1 WO 2007011117A1 KR 2006002535 W KR2006002535 W KR 2006002535W WO 2007011117 A1 WO2007011117 A1 WO 2007011117A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
field emission
emission device
electrode members
emitter
Prior art date
Application number
PCT/KR2006/002535
Other languages
English (en)
Inventor
Dong Wook Yang
Original Assignee
Iljin Diamond Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iljin Diamond Co., Ltd filed Critical Iljin Diamond Co., Ltd
Publication of WO2007011117A1 publication Critical patent/WO2007011117A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H01J1/304—Field-emissive cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • 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
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/021—Electron guns using a field emission, photo emission, or secondary emission electron source
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
    • H01J63/02—Details, e.g. electrode, gas filling, shape of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
    • H01J63/02—Details, e.g. electrode, gas filling, shape of vessel
    • H01J63/04—Vessels provided with luminescent coatings; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
    • H01J63/06—Lamps with luminescent screen excited by the ray or stream
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements

Definitions

  • the present invention relates to a field emission device; and, more particularly, a field emission device capable of preventing leakage current between electrodes while improving unstable light emitting characteristics.
  • a currently utilized filed emission device such as a field emission type backlight, an FEFL(Field Emission Flat Lamp) and a field emission display utilizes an acute cold cathode on behalf of a hot cathode used in a conventional cathode ray tube as a means for discharging an acceleration electron to excite a fluorescent material. That is, the electrons due to a quantum mechanical tunnel effect are discharged by concentrating high electric field on an emitter forming the cold cathode.
  • Diode or triode structure exists in a conventional field emission device.
  • a method allows the electrons to excite and emit the fluorescent material by extracting the electrons from the field emission material by applying a high voltage between the anode electrode and the cathode electrode.
  • the diode structure has advantages that a manufacturing cost is low, a manufacturing process is easy and a light emitting area is large, but there are problems that a driving voltage is high and a luminance to be emitted stably is low and luminous efficiency is low.
  • the field emission devices for the triode structure are disclosed in Korea public patent No. 2000-74609, United States of America patent 5,773,834 and Korea public patent Nos. 2001-84384 and 2004-44101.
  • a gate electrode as an auxiliary electrode is separately formed from the cathode at a distance from several tens of nano meters to several millimeters. Consequently, the emitted electron excites the fluorescent substance of the anode so as to emit light by applying the high voltage to the anode and the cathode.
  • This triode structure has the advantages of significantly lowering driving voltage and securing high luminance but there are problems such as relatively high cost for manufacturing, long manufacturing time, and small light emitting area.
  • Fig. 1 represents a lateral gate type field emission device disclosed in Korea publication patent No. 2004-44101.
  • the cathode 10 is formed on a surface of a rear substrate 5
  • the emitter made of CNT is placed on a top surface of the cathode 10 with a predetermined gap
  • the gate electrode 25 is adjacent to the rear substrate 5 by media of an insulation layer 15.
  • the lateral gate type field emission device is composed of an anode 35 composed of a fluorescent material layer 30 and ITO (Indium Tin Oxide) by facing the rear substrate 5 and a front substrate 40.
  • Fig. 2 is a construction diagram of Korea patent application No. 2004-70871 which is previously filed by the applicant of the present invention.
  • the first electrode 105 and the second electrode 110 are placed on a top surface of the rear substrate 100, and also the emitter 115 is placed on a top surface of the first electrode 105 and the second electrode 110.
  • This is a structure obtained by particularly removing a difference between the gate electrode and the cathode by forming the emitter 115 on the first electrode 105 and the second electrode 110.
  • the first electrode 105 and the second electrode 110 become the gate electrode or the cathode according to the driving voltage.
  • the increment of light emitting area and light emitting efficiency, uniform light emission, high luminance, and long lifetime can be achieved.
  • FIG. 3 is a plane view of the rear substrate 110 of the field emission device of Fig. 2.
  • the first electrode member 105 and the second electrode member 110 are formed in a rake-shape crossing each other.
  • the electrons are discharged from the emitter 115 placed on each electrode by alternately applying voltage having different polarities from each other to the first electrode member 105 and the second electrode member 110, respectively.
  • higher current density is obtained at the same electric field in comparison with the field emission device of the conventional lateral gate triode structure.
  • the present invention has been proposed in order to overcome the above-described problems in the related background art. It is, therefore, an object of the present invention to provide a field emission device capable of preventing a leakage current between electrodes and improving an unstable light emitting characteristic by forming an emitter having more than four individual electrodes.
  • a field emission device including a front substrate and a rear substrate disposed by being separated at a predetermined distance from each other, an anode formed on the front substrate, a fluorescence material formed on the anode, a plurality of electrode members placed on the rear substrate by being separated at a predetermined distance from each other and an emitter formed on at least one among the electrode members, wherein the electrode members are composed of at least four electrode members, each electrode is formed alternately, and the emitters of each electrode member are separated from each other.
  • the electric field emission device in accordance with the present invention has advantages as follows: At first, it can prevent a leakage current between electrodes, even if a gap between the electrodes is smaller than that of the conventional dual emitter triode structure and a lateral gate method; and Secondly, it can obtain more natural images than applied to an LCD(Liquid Crystal Display) backlight, even if individual electrodes are formed at the same distance as that of the conventional method.
  • FIGs. 1 to 3 are diagrams showing a field emission device according to a prior art
  • FIG. 4 is a cross-sectional view depicting a field emission device in accordance with an embodiment of the present invention.
  • FIG. 5 is a plane view representing a rear substrate of the field emission device in accordance with the embodiment of the present invention.
  • FIG. 6 is a cross-sectional view describing a field emission device in accordance with another embodiment of the present invention.
  • FIG. 7 is a cross-sectional view illustrating a field emission device in accordance with still another embodiment of the present invention.
  • FIG. 8 is a view comparing the field emission device in accordance with the embodiments of the present invention with the conventional field emission device;
  • FIG. 9 is an applied driving waveform diagram of the field emission device in accordance with the embodiments of the present invention.
  • FIG. 10 is a comparison diagram comparing the field emission device in accordance with the embodiment of the present invention with the conventional device;
  • FIG. 11 is a comparison diagram comparing the field emission device in accordance with the above-described another embodiment of the present invention with the conventional device;
  • Fig. 12 is an applied driving waveform diagram of the field emission device in accordance with the above-described embodiment of the present invention.
  • FIG. 13 is a comparison diagram comparing the field emission device in accordance with the above-described embodiment of the present invention with the conventional device.
  • FIG. 14 to 15 is an exemplary diagram depicting a driving circuit of the field emission device in accordance with the present invention.
  • FIG. 4 is a construction diagram showing a field emission device in accordance with an embodiment of the present invention.
  • a first electrode member 106, a second electrode member 107, a third electrode member 108 and a fourth electrode member 109 are formed on a rear substrate 100, and an emitter 115 is placed on a top surface of the electrode members
  • the electrode members 106, 107, 108 and 109 can be a gate or a cathode according to a driving voltage as a structure that practically removes a difference between the gate electrode and the cathode.
  • a leakage current between the electrodes can be prevented and an unstable light- emitting characteristic can be improved.
  • the rear substrate 100 can be made of glass, alumina (Al O ), quartz, plastic, and silicon (Si), but the glass substrate is more preferable.
  • the electrodes 106, 107, 108 and 109 can be made of metal such as silver(Ag), chrome(Cr), copper(Cu), aluminum(Al), nickel(Ni), zinc(Zn), titanium(Ti), platinum(Pt), tungsten(W), or ITO(Indium Tin Oxide) and an alloy thereof, and it is appropriate to employ a printing method such as a screen printing method, but the electrode members 106, 107, 108 and 109 can be formed by using a method of sintering a metal powder or a thin film deposition method such as a sputtering, a vacuum deposition and a CVD(Chemical Vapor Deposition).
  • the emitter 115 can be made of a carbon nano tube, diamond, DLC(Diamond Like
  • Carbon fullerene, palladium oxide(PdO) or the like, but the carbon nano tube capable of emitting electrons even in a relatively low voltage is further preferable.
  • a transparent electrode 205 and a fluorescence material 210 are formed on a front substrate and a spacer 300 maintaining a gap between the front substrate 200 and the rear substrate 100 exists.
  • the front substrate 200 and the rear substrate 100 are sealed by a sealing agent such as a frit glass, thereby maintaining an inside space therebetween at a high vacuum in a degree of 10 torr.
  • the front substrate 200 can be made of glass, quartz, plastic or the like, but the glass is further preferable.
  • all the rear substrate 100 and the front substrate 200 are made of plastic substrates, they can be used as a backlight of a flexible liquid crystal display.
  • a transparent electrode 205 can be formed by depositing, coating or printing transparent conducting material such as ITO on the front substrate 200.
  • a white fluorescence material such as oxide or sulfide obtained by mixing red, green, and blue fluorescence materials in a predetermined ratio is suitable for the fluorescence material 210 and the fluorescence material 210 can be formed by the screen printing method.
  • the field emission device of the present invention includes a DC inverter 400 capable of generating power applied to the anode 205 on the front substrate for driving the same and an AC inverter 402 capable of generating power applied to each of the electrode members 106, 107, 108 and 109.
  • An inner structure of the AC inverter 402 can apply various modifications to constructions of each electrode members 106, 107, 108 and 109 according to a size of the front substrate 200.
  • An AC inverter can be constructed by at least one.
  • FIG. 5 is a plane view showing the rear substrate of the field emission device in accordance with the present invention.
  • each of the electrode members 106, 107, 108 and 109 is alternately formed in a rake shape, and electrons are emitted from the emitter 115 placed on each electrode member 106, 107, 108 and 109 by alternately applying voltages having different polarities from each other according to the phase difference of the electrode members 106, 107, 108 and 109. Since the electrons are emitted from all the electrode members 106, 107, 108 and 109, higher current density can be obtained in comparison with the conventional field emission device with a lateral gate triode structure.
  • Insulating material 112 is formed on a portion overlapped by each electrode member one another.
  • FIG. 6 is a construction diagram showing a field emission device in accordance with another embodiment of the present invention.
  • a construction according to Fig. 6 is a method that is operated by making a pair of the first electrode member 106 and the third electrode member 108 and making a pair of the second electrode member 107 and the fourth electrode member 109
  • a construction according to Fig. 4 is a method that is operated by making a pair of the first electrode member 106 and the second electrode member 107 and making a pair of the third electrode member 108 and the fourth electrode member 109.
  • Figs. 8a to 8c are diagrams comparing a driving method in accordance with a construction of the field emission device in Fig. 4 with driving methods according to prior arts.
  • Fig. 8a represents a method for driving a conventional dual emitter
  • Fig. 8b represent a method for driving a quadruple emitter in accordance with embodiments of the present invention
  • Fig. 8c represents a method for driving a conventional lateral gate.
  • Fig. 8 shows that the driving methods shown in Figs. 8a to 8c are emitted at the same electrode distance.
  • the first electrode and the second electrode are represented by X and Y in Fig.
  • the first electrode, the second electrode, the third electrode, and the fourth electrode are represented by Xl, X2, Yl and Y2, respectively in Fig. 8b; and the gate and emitter are represented by X and Y, respectively in Fig. 8c.
  • Fig. 9 represents a driving waveform applied in response to times Tl, T2, T3 and
  • the electron emission according to the driving waveform of Fig. 9 is equal to that of Fig. 10.
  • the dual emitter of Fig. 8a and the quadruple emitter of Fig. 8b show the same number of the light emissions (8 times), and the lateral gate method of Fig. 8c shows a half of the number (4 times).
  • the dual emitter method of Fig. 8a and the quadruple emitter method of Fig. 8b show the same number of light emission, it is shown that the quadruple emitter of Fig. 8b can emit the light continuously. Accordingly, the more excellent images are obtained than the conventional device when the quadruple emitter method according to the embodiment of the present invention is applied to the LCD backlight.
  • FIG. 11 shows diagrams comparing the driving method in accordance with the field emission device of Fig. 6 with those of the prior arts.
  • a conventional dual emitter driving method is described in Fig. 1 Ia; a quadruple emitter driving method in accordance with the embodiment of the present invention is depicted in Fig. 1 Ib; and a conventional lateral gate driving method is shown in Fig. 11C.
  • Figs. 1 Ia to l ie represent the light emission methods at a different electrode distance from each other.
  • the first electrode member and the second electrode member are represented by X and Y in Fig.
  • the first electrode member, the second electrode member, the third electrode member, and the fourth electrode member are represented by Xl, X2, Yl and Y2, respectively in Fig. 1 Ib; and the gate and emitter are represented by X and Y, respectively in Fig. 1 Ic.
  • Fig. 12 shows the applied driving waveform according to the times Tl, T2, T3 and
  • the electron emission according to the driving waveform of Fig. 12 is equal to that of Fig. 13.
  • the dual emitter of Fig. 11a and the quadruple emitter of Fig. 1 Ib show the same number of the light emissions (4 times), and the lateral gate method of Fig. 1 Ic shows a half of the number (2 times).
  • the quadruple emitter of Fig. 1 Ib can obtain the same number of the light emission with the half of frequency cycle of the dual emitter method of Fig. 11a. Therefore, the quadruple emitter method in accordance with the embodiment of the present invention increases the life span of the field emission device more than twice.
  • the field emission device in accordance with the embodiment of the present invention is capable of adopting a driving method having various frequencies and duty ratios when applying a square wave and an AC wave.
  • driving circuits of Fig. 14 to Fig. 15 can be adopted.
  • Fig. 14 shows a driving circuit in accordance with the field emission device of the present invention.
  • the power is applied to the AC inverter 402 from an input power supply 401.
  • an irregular waveform is filtered at a power filtering member 402a, an power transformed into desired various shapes applied to a high voltage generation member 402d by using a power device at the power driving stage 402c through a power supply member 402b and a driving pulse is generated.
  • the electric power applied to the high voltage generating member 402d is applied to the first electrode member 106, the second electrode member 107 and an transparent substrate (an anode substrate) 205 through a transformer to operate the field emission device. This can be also applied to the third electrode member 108 and the fourth electrode member 109, similarly.
  • Fig. 15 is one embodiment showing the high voltage generating member 402d of the AC inverter 402.
  • the high voltage generating member 402d of Fig. 15 represents such a state that each driving duty of the first electrode and the second electrode is 50%.
  • the case as shown in Fig. 14 is operated by commonly grounding an intermediate tab region of a secondary coil of a pair of transformers 404 and 406 among construction elements consisting of the whole inverter to the DC inverter 400.
  • the ground of the present invention employs a virtual grounding method so as to generate a stable output.
  • the driving circuits of Fig. 14 and Fig. 15 can be applied to the driving method of

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

La présente invention concerne un dispositif d’émission de champ et, plus précisément, un dispositif d’émission de champ permettant d’éviter un courant de fuite entre des électrodes tout en améliorant les caractéristiques d’émission lumineuse instable. Le dispositif d’émission de champ de la présente invention comprend : un substrat avant et un substrat arrière disposés avec une distance de séparation prédéterminée, une anode formée sur le substrat avant, un matériau fluorescent formé sur l’anode, une pluralité d’éléments d’électrode placés sur le substrat arrière avec une distance de séparation prédéterminée, et un émetteur formé sur au moins l’un des éléments d’électrode, lesdits éléments étant composés d’au moins quatre électrodes, chaque électrode étant formée de manière alternée et les émetteurs de chaque élément étant séparés les uns des autres. Grâce à la formation d’un émetteur doté d’au moins quatre électrodes indépendantes, le dispositif d’émission de champ électrique selon la présente invention offre les avantages suivants : en premier, il permet d’éviter un courant de fuite entre des électrodes, même si un espace entre celles-ci est inférieur à celui d’une structure de triode d’émetteur double classique et d’un procédé de grille latérale ; et, en second, il permet d’obtenir des images plus naturelles qu’en cas de rétro-éclairage d’affichage à cristaux liquides (LCD), même si différentes électrodes sont formées à la même distance que dans un procédé classique.
PCT/KR2006/002535 2005-07-18 2006-06-29 Dispositif d’émission de champ WO2007011117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050064648A KR100710592B1 (ko) 2005-07-18 2005-07-18 전계 방출 장치
KR10-2005-0064648 2005-07-18

Publications (1)

Publication Number Publication Date
WO2007011117A1 true WO2007011117A1 (fr) 2007-01-25

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Application Number Title Priority Date Filing Date
PCT/KR2006/002535 WO2007011117A1 (fr) 2005-07-18 2006-06-29 Dispositif d’émission de champ

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KR (1) KR100710592B1 (fr)
WO (1) WO2007011117A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054557A1 (fr) * 2007-10-26 2009-04-30 Kumho Electric, Inc. Dispositif à émission de champ
WO2009057837A1 (fr) * 2007-10-31 2009-05-07 Kumho Electric, Inc. Circuit de commande à courant constant pour dispositif à émission de champ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008146974A1 (fr) * 2007-05-30 2008-12-04 Airtec System Co., Ltd. Ballast hybride de pilotage d'une lampe triode à nanotubes de carbone

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07114896A (ja) * 1993-10-20 1995-05-02 Futaba Corp 電界放出形蛍光表示装置及びその駆動方法
US6515415B1 (en) * 2000-02-15 2003-02-04 Samsung Sdi Co., Ltd. Triode carbon nanotube field emission display using barrier rib structure and manufacturing method thereof
US6699642B2 (en) * 2001-01-05 2004-03-02 Samsung Sdi Co., Ltd. Method of manufacturing triode carbon nanotube field emitter array
US20040104668A1 (en) * 2002-12-03 2004-06-03 Industrial Technology Research Institute Triode structure of field emission display and fabrication method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3267432B2 (ja) * 1993-12-20 2002-03-18 双葉電子工業株式会社 ディスプレイ装置
KR20020065968A (ko) * 2001-02-08 2002-08-14 인더스트리얼 테크놀로지 리써치 인스티튜트 전계 방출 디스플레이 패널용 전자 이미터 스택의 제조방법과 그 구조

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07114896A (ja) * 1993-10-20 1995-05-02 Futaba Corp 電界放出形蛍光表示装置及びその駆動方法
US6515415B1 (en) * 2000-02-15 2003-02-04 Samsung Sdi Co., Ltd. Triode carbon nanotube field emission display using barrier rib structure and manufacturing method thereof
US6699642B2 (en) * 2001-01-05 2004-03-02 Samsung Sdi Co., Ltd. Method of manufacturing triode carbon nanotube field emitter array
US20040104668A1 (en) * 2002-12-03 2004-06-03 Industrial Technology Research Institute Triode structure of field emission display and fabrication method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054557A1 (fr) * 2007-10-26 2009-04-30 Kumho Electric, Inc. Dispositif à émission de champ
WO2009057837A1 (fr) * 2007-10-31 2009-05-07 Kumho Electric, Inc. Circuit de commande à courant constant pour dispositif à émission de champ

Also Published As

Publication number Publication date
KR20070010238A (ko) 2007-01-24
KR100710592B1 (ko) 2007-04-24

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