baber/WOPTO huggingface dataset:
Patent KR-20040051780-A (KR)
Title: An Automatic Refilling Equipment of Mini-mill Ca-fe wire Cage
Inventor: KIM JEONG U
IPC: C21C7/00
Filed: 2002-12-13
Abstract: PURPOSE: An apparatus for automatically supplementing calcium wire cage in mini mill is provided to prevent increase of operation load and prevent danger of safety accident during moving by automatically supplementing and removing the calcium wire cage and stabilize facility and reduce labor cost by easily sensing consumption of calcium wire. CONSTITUTION: The apparatus comprises a cage transfer part automatically operated with being linked with calcium wire injection time of the cage position conversion part to supply calcium wire cage to the cage position conversion part and recover a used empty cage from the cage position conversion part; a cage position conversion part automatically operated with being linked with weight of the cage to convert position of the calcium wire cage transferred from the cage transfer part into an injection position and convert position of the used empty cage into a discharge position; and an empty cage discharge part automatically operated by sensing position of the cage to discharge the used empty cage positioned at the discharge position of the cage position conversion part to the cage transfer part, wherein the cage transfer part comprises chain sprocket, roller chain, chain stopper and rotation rollers, wherein the cage position conversion part comprises central shaft(9), driving base plate(6), four load cell upper plates(11), lengthwise shaft roller(13) and widthwise shaft roller(14), and curved pipe rail(8), and wherein the cage discharge part comprises cylinder base, moving plate, discharge cylinder base, discharge cylinder and discharge bar.
Patent KR-20040054860-A (KR)
Title: Roll gap setup method using automatically predicted mill modulus and gaugemeter error in rolling mill
Inventor: HONG SEONG CHEOL
IPC: B21B37/58
Filed: 2002-12-18
Abstract: PURPOSE: A method for setting roll gap of continuous rolling mill is provided to obtain strip thickness of high accuracy by predicting mill constant, mill constant correcting coefficient and gauge meter error using data of actual rolling results. CONSTITUTION: The method for setting roll gap of rolling mill by automatically predicting mill constant and gauge meter error comprises first step (S100,S110) of forming respective gauge meter expressions of the front and intermediate parts of the relevant rolling material using the average values as parameters after obtaining respective average values of respective data of actual rolling results of front and intermediate parts of relevant rolling material; second step (S120) of obtaining mill constant (Mw) and gauge meter error using the respective gauge meter expressions formed in the first step; third step (S130) of obtaining a mill constant correcting coefficient according to strip width using the mill constant (Mw) calculated in the second step and a mill constant (M) measured in the state that the rolling material is not metal-in the rolling mill; and a fourth step (S140) of setting the abstracted data as rolling conditions during the following rolling by abstracting the data after storing the mill constant (Mw), gauge meter error and mill constant correcting coefficient obtained in the first to third steps.
Patent KR-20040059016-A (KR)
Title: A bi-directional optical module and A device for bi-directional optical transceiver
Inventor: LEE DONG JIN
IPC: G02B6/42
Filed: 2002-12-27
Abstract: PURPOSE: A bidirectional optical module and a bidirectional optical transceiver are provided to minimize the loss of optical signals by simplifying an optical signal transmission system among an optical connector, a light-transmitting element, and a light-receiving element. CONSTITUTION: A bidirectional optical module includes an optical case(210), a light transmitting element(220), a light receiving element(230), and a plurality of filters(240,250). The bidirectional optical module further includes an optical connector insertion unit, an optical connector, an optical fiber, an optical fiber stub, an optical stub housing, and an optical signal transfer unit. An external optical cable and an optical connector are inserted into the optical connector insertion unit(280-1). The optical fiber(311) is installed in the inside of the optical connector(310). The optical fiber stub(281) is inserted into the optical stub housing(280-2). The optical signal transfer unit(280) is installed in the optical case.
Patent KR-20040059985-A (KR)
Title: Method for fabricating capacitor in semiconductor device
Inventor: KIL DEOK SIN
IPC: H01L27/108
Filed: 2002-12-30
Abstract: PURPOSE: A method for manufacturing a capacitor of a semiconductor device is provided to be capable of improving leakage current. CONSTITUTION: A conductive layer(22) as a lower electrode is formed on a semiconductor substrate(20). A dielectric film(24) made of SrTiO3 is formed on the conductive layer. An alumina layer(25) is formed on the dielectric film by ALD(Atomic Layer Deposition) using O2 plasma. Then, a conductive layer(26) as an upper electrode is formed on the alumina layer.
Patent KR-20040061479-A (KR)
Inventor: CHOI BONG GI
IPC: H04B1/74
Filed: 2002-12-31
Abstract: PURPOSE: A method for forecasting channel situation information in a communication system is provided to efficiently transmit data by forecasting C/I information related to a forward link to be received after 2-3 slots. CONSTITUTION: Weight vectors are obtained to be respectively multiplied by a plurality of C/I(Carrier to Interference ratio) information transmitted from a receiving end to a transmitting end. The C/I information to be received by the transmitting end is forecasted through a process of adding the C/I information multiplied by the weight vectors before the receiving end transmits the C/I information to the transmitting end.
Patent KR-20040061544-A (KR)
Title: Complex test mask for wafer process
Inventor: KIM U YONG
IPC: H01L21/027
Filed: 2002-12-31
Abstract: PURPOSE: A complex test mask for a semiconductor process is provided to eliminate the necessity of masks with specific sizes by synthetically testing shot uniformity and an overlay degree. CONSTITUTION: Unit modules of nxm are disposed on a mask. A plurality of vertical/horizontal line patterns in which a pitch or CD line width is divided into a sequential size are formed, and one of the plurality of vertical/horizontal line patterns is selected and tested by a line mark unit. A plurality of matrix patterns that are sequentially divided from the smallest pattern size capable of embodying a space or a hole are formed, and one of the matrix patterns is selected and tested by a matrix mark unit. A plurality of overlay patterns that divide the size a pair composed of an outer box pattern and an inner box pattern into a sequential size are formed, and one of the overlay patterns is selected and tested by an overlay mark unit. The complex test mask includes the line mark unit, the matrix mark unit and the overlay mark unit in the unit module.
Patent KR-20020035886-A (KR)
Title: Method for making a card with multiple contact tips for testing microsphere integrated circuits, and testing device using said card
IPC: G01R1/06
Filed: 2001-07-24
Abstract: The invention concerns a method for making a card with tips for testing semiconductor chips with microsphere bond pads. A first adhesive coat is vacuum deposited on a flexible polyimide film, followed by a second metal coat. A combination of UV photolithography and electroforming of a metal material enables to obtain the implantation of the tips. The pattern of the strip conductors is obtained by a second UV lithography operation whereby the second metal layer and the first adhesive coat are etched. An insulating protective resist is deposited on the active conductive zone. The flexible film is mounted on a truncated maintaining component whereof the vertical translational and planar rotational movements are made possible by a guide supported on a spring suspension. The defective alignment between the plane of the tips and the plane of the tips and the printed circuit plane is corrected by a correcting system with three support points adjustable with screws.
Patent KR-20030008212-A (KR)
IPC: G03F7/038
Filed: 2001-09-10
Abstract: 본 발명의 감광성 조성물은 카르복실기를 보유하는 (A)우레탄 (메타)아크릴레이트 화합물을 함유하는 광경화성 성분; (C)열경화성 수지; (D)광중합 개시제; 및 (E)열중합촉매를 함유하는 감광성 조성물을 함유하고, 상기 광경화성 성분은 (A)를 제외한 에틸렌성 불포화기를 보유하는 (B)화합물 및 카르복실기를 보유하는 (F)에폭시 (메타)아크릴레이트 화합물 중 하나 이상을 더 함유한다. 그러므로, 상기 감광성 조성물은 프린트회로기판용 절연보호피막으로서 사용하기에 적합하다. 본 발명의 감광성 조성물로 이루어진 경화막은 특히 유연성이 우수하므로, 박막회로기판에 사용하는 경우에도 컬링이 생기지 않는다. 그러므로, 상기 경화막은 FPC기판으로 사용하기에 매우 적합하다.
Patent KR-20020045618-A (KR)
Title: 증기형 가스 터빈 소조립체 및 증기형 가스 터빈의 성능향상 방법
IPC: F01D5/14
Filed: 2001-08-17
Abstract: 터빈의 성능 향상을 위한 증기형 가스 터빈 소조립체(22)는 스테이터(24)와, 로터(26)와, 환상 브러시 시일(28) 또는 환상 레버린스 시일(56)과, 제 1 및 제 2 가스 흐름 전향기(30, 32)를 포함한다.  주요 가스 흐름(44)은 선회 공간 공동(46)을 함께 형성하는 스테이터(24) 및 로터(26)를 따라서 이동한다.  2차 가스 흐름(48)은 선회 공간 공동(46)을 통해 로터(26)의 상류 단(36)에 인접한 주요 가스 흐름(44)으로부터 로터(26)의 하류 단(38)에 인접한 주요 가스 흐름(44)으로 이동한다.  환상 브러시 시일(28) 또는 환상 레버린스 시일(56)은 로터의 단(36, 38) 사이의 선회 공간 공동(46)을 횡단하여 연장되어 2차 가스 흐름(48) 중 적어도 일부분을 차단한다.  가스 흐름 전향기(30, 32)는 반경방향으로 배치되고 서로 편향되어 2차 가스 흐름(48)이 주요 가스 흐름(44)에 대해 접선 관계로 향하도록 한다.
Patent KR-20020084116-A (KR)
Title: 2-벤조티아졸릴 우레아 유도체 및 이의 단백질 키나제억제제로서의 용도
IPC: A61K31/428
Filed: 2001-02-06
Abstract: 본 발명은 화학식(I)의 화합물, 이의 라세미체-부분입체이성체 혼합물, 광학 이성체, 프로드러그, 동위체 또는 이들 화합물, 이성체, 프로드러그 및 동위체의 약제학적으로 허용되는 염에 관한 것이다: 
     
       
     
     본 발명의 화합물은 세린/트레오닌 및 티로신 키나제의 억제제로서 유용하다. 특히, 본 발명의 화합물은 과증식 질환, 특히 암 및 혈관형성의 과정에서 중요한 티로신 키나제의 억제제로서 유용하다.
Patent KR-20020081367-A (KR)
Title: 차량의 견인력을 감시하기 위한 시스템 및 방법
IPC: B60T8/1761
Filed: 2001-12-20
Abstract: 본 발명은, 주로 주행 노면과 휠 접촉면 사이에 작용하는 각 휠(12)의 적어도 하나의 휠 힘 성분을 측정하고 휠 힘 성분을 나타내는 신호(Si, Sa)를 발생시키는, 휠(12)에 배속된 적어도 하나의 휠 하중 센서 장치(10)와, 휠(12)의 휠 힘 성분을 나타내는 신호(Si, Sa)를 처리하는 평가 장치(14)를 포함하는, 적어도 두 개의 휠(12)을 구비하는 차량의 견인력을 감시하기 위한 시스템에 관한 것이다.  본 발명에 따르면, 평가 장치(14)는 처리 결과에 따라 각 휠(12)의 상승 상태를 평가한다.  또한, 본 발명은 견인력을 감시하기 위한 방법에도 관련된다.
Patent KR-20020080467-A (KR)
Title: 비수전해질 이차전지
IPC: H01M10/05
Filed: 2001-03-06
Abstract: Si 또는 Sn을 포함하는 복합입자를 음극에 사용한 경우에, 충전·방전의 반복에 의해 입자가 미분화함에 따른 전자도전성의 저하를 개선하기 위해서, 음극재료의 메디안지름 Da와 도전재의 메디안지름 Dc의 입자지름비 Dc/Da를 0.02∼0.5로 한다.
Patent KR-20020093948-A (KR)
Title: 반도체 웨이퍼 처리 장치 및 방법
IPC: H01L21/00
Filed: 2001-03-29
Abstract: 본 발명의 목적은 기판, 특히 반도체 웨이퍼를 처리하기 위한 방법에서 화학 제품의 소비를 감소시키기 위한 것으로, 처리 용기내에서 각각의 수용기로부터의 여러가지 처리 용액이 기판을 처리하도록 연속적으로 안내된다.  이러한 목적을 위하여, 본 발명은 처리 유체가 처리 이후에 집수 용기로 공급되고, 처리 용액의 적어도 일부가 집수 용기로부터 회수되며 각각의 수용기로 되돌아가고, 집수 용기는 처리 용액이 회수된 후에 다른 처리 용액이 수용되기 전에 린스된다.  본 발명은 또한 기판, 특히 반도체 웨이퍼를 처리 용기에서 처리하기 위한 장치에 관한 것이다.  이러한 장치는 여러가지 상이한 수용기로부터 여러가지 처리 용액을 처리 용기로 안내하기 위한 제 1밸브 유니트를 포함하고, 처리 우헤 처리 용액을 집수하기 위한 집수 용기와, 집수 용기로부터 처리 용액의 적어도 일부를 제거시키며 각각의 수용기로 되돌리기 위한 제 2밸브 유니트와, 그리고 집수 용기를 린스하기 위한 린스 유니트를 포함한다.
Patent KR-20030034113-A (KR)
Title: 7-hydroxyepiandrosterone having neuroprotective activity
IPC: A61K31/5685
Filed: 2001-06-29
Abstract: 3-Hydroxy-7β-hydroxy steroids and 3-oxo-7β-hydroxy steroids and pharmaceutically acceptable esters thereof are useful for protection against neuronal damage.
Patent KR-20040064119-A (KR)
Inventor: SON BYEONG CHEOL
IPC: A61K8/97
Filed: 2003-01-09
Abstract: PURPOSE: Provided is an antibacterial hand cleanser composition which exerts excellent antibacterial effect while reducing the amount of usage, and palliates or remedies skin diseases, such as eczema and itches, due to the bacteria together with the anti-inflammatory and deodorizing effects. CONSTITUTION: The antibacterial hand cleanser composition comprises 0.01-2wt.% of 2,4,4-trichloro-2-hydroxy diphenylether expressed by formula 1, 0.01-2wt.% of 3,4,4-trichloro carbanylide expressed by formula 2, and 0.01-5wt.% of lavender extract. The composition is in a liquid phase.
Patent KR-20040064774-A (KR)
Inventor: JUNG CHEOL O
IPC: C08L7/00
Filed: 2003-01-10
Abstract: PURPOSE: Provided is a rubber composition for tire treads, which has excellent physical properties, wear resistance, durability and braking performance, and has a good fuel consumption efficiency. CONSTITUTION: The rubber composition for tire treads comprises: 100 parts by weight of a base rubber consisting of 60-70 wt% of high cis-1,4-polybutadiene, 20-30 wt% of a butadiene rubber having a high vinyl content and 10-20 wt% of natural rubber or synthetic isoprene; 30-40 parts by weight of carbon black, 10-20 parts by weight of silica, 4-10 parts by weight of a carbon black coupling agent; 2-4 parts by weight of a silica coupling agent; 12-17 parts by weight of castor oil; and other additives.
Patent KR-20040068789-A (KR)
Inventor: LEE MYEONG RYEOL
IPC: F25D31/00
Filed: 2003-01-27
Abstract: PURPOSE: An instantaneous cooling apparatus with a microwave oven is provided to cook food conveniently by cooling food quickly and by heating food promptly with microwave from the microwave oven. CONSTITUTION: An instantaneous cooling apparatus(100) comprises a cold accumulation material storage part installed in a freezer compartment to contain beverage; a vibrating unit applying vibration to the cold accumulation material storage part; and a spring installed in the lower part of the cold accumulation material storage part and the vibrating unit to damp vibration from the vibrating unit and the refrigerator. A microwave oven(200) is detachably mounted in the upper part of the instantaneous cooling apparatus. Food is cooked conveniently by combining the microwave oven with the instantaneous cooling apparatus.
Patent KR-20030068042-A (KR)
Inventor: KIM JIN DO
IPC: F03G7/00
Filed: 2003-01-30
Abstract: PURPOSE: A power generator is provided to generate power in a contamination-free way, while lengthening the useful life of the power generator. CONSTITUTION: A power generator comprises a movable weight which moves in a downward direction along a D-type diagonal rail, passes through an R-type rail, and moves in upward and horizontal directions; and two special rings attached to a chain interposed between the two moving weights and engaged with each other. The two special rings operate at the same time, to thereby allow the weights to have a balanced force.
Patent KR-20040078221-A (KR)
Inventor: KO HO SEONG
IPC: H04B1/38
Filed: 2003-03-03
Abstract: PURPOSE: An opening and shutting apparatus of a communication equipment is provided to open and shut a cover to a main body, and inverse front and rear surfaces of the cover. CONSTITUTION: A bracket(120) is fixed at a main body(100) of a communication equipment, and has a cylinder(122) having a rotary hole(124). A hinge barrel body(130) is rotatively combined with a cover(110) to rotate the cover(110) from the main body(100), having a rotary space part(132) in a center. A central shaft(140) is installed in the rotary space part(132), and is rotatively combined in the rotary hole(124) to swing the cover(110) from the main body(100). A first resistant element is installed in the rotary hole(124) and generates resistance power to the rotation of the central shaft(140) within a certain range. A second resistant element is installed between the hinge barrel body(130) and the cover(110), and generates resistance power to the rotation of the cover(110) within a certain range.
Patent KR-20040079257-A (KR)
Inventor: JUNG YOUNG CHAI
IPC: B60R13/10
Filed: 2003-03-07
Abstract: PURPOSE: A license plate is provided to prevent escape after traffic accidents by discharging evidences from the license plate when an impact is applied to the license plate. CONSTITUTION: A license plate(10) for preventing escape after traffic accidents is composed of a plurality of evidence holding members(13,14) having a first discharge passage(11) and a plurality of evidences(12), a spherical magnetic body(20) disposed at the first discharge passage and opening/closing the first discharge passage, a ring-shaped magnet(25) installed at the bottom of the spherical magnetic body and moving the spherical magnetic body, a rest(30) to which the ring-shaped magnet is fixed, a plurality of isolation films(50,51) coupled to the bottom of the evidence holding members and uniformly keeping the moving distance of the spherical magnetic body, and a plurality of support members(40,41) coupled to the isolation films and having second discharge passages(31,32).
Patent KR-20040088628-A (KR)
Inventor: EOM YONG TAEK
IPC: H05H1/30
Filed: 2003-04-10
Abstract: PURPOSE: An inductively-coupled multi-coil plasma source for providing uniform plasma is provided to maximize uniformity of magnetic field by maximizing the intensity of inductive magnetic field within a limited area. CONSTITUTION: An inductively-coupled multi-coil plasma source includes a first inductive coil, a plurality of second inductive coils, and a power supply. The second inductive coils(250) are arranged around the outside of the first inductive coil(210). The second inductive coils facing the first inductive coil are parallel to the first inductive coil. The power supply(410) is used for supplying the power to the first inductive coil and the second inductive coils in order to provide the inductive magnetic field enabling the first inductive coil and the second inductive coils to generate plasma.
Patent KR-20040090776-A (KR)
Inventor: SEO DAE SEOK
Filed: 2003-04-18
Abstract: PURPOSE: A digital content service method and system is provided to distribute an advertisement card on which a unique number for each customer is printed, and to enable a customer to use various digital contents by using the unique number. CONSTITUTION: The method comprises several steps. It is checked whether an advertiser accesses a server, and requests the server to make an advertisement card(S10). In a case that the advertiser requests the server to make an advertisement card, the server displays an advertisement type selection page(S11, S12). Then, the server randomly generates a unique approval code for each customer needed for approving the customer(S13, S14). Advertisement cards with unique numbers are made by using the selected advertisement design(S15). The advertisement cards are distributed to customers via the advertiser(S16, S17). In a case that the customer accesses the server by using the advertisement card, the server displays a digital content list, paid or free(S18, S19). In a case that the customer selects one among the digital content list, the server requests the customer to input a unique number(S20, S21). In a case that the customer inputs the unique number, the server transmits the selected digital content to the customer(S22-S24).
Patent KR-20040092045-A (KR)
Inventor: LEE JUN HYEONG
IPC: G06F1/16
Filed: 2003-04-23
Abstract: PURPOSE: A guide for mounting a battery and parts of a portable computer is provided to easily attach/detach an RTC(Real Time Clock) battery and minimize the number of parts forming a notebook computer. CONSTITUTION: An installation guide main body(31) is fixed by adopting the part at the inside. A battery installation guide(35) is formed to one side of the installation guide main body and accepts the battery. The battery installation guide comprises an adopting plate(36) adopting the battery at an upper side and connecting to the installation guide main body, fixing projections(37,37') pushing/fixing an upper corner of the battery by being installed to both ends of the adopting plate, and a pushing part(38) varying a distance between fixing projections by being formed to one end of the adopting plate combined with one fixing projection in an elastically deformable state.
Patent KR-20040094919-A (KR)
Inventor: KIM BYEONG JO
IPC: G01M1/14
Filed: 2003-05-06
Abstract: PURPOSE: A tire balance adjustment apparatus is provided to allow a user to recognize a reason of an error by directly marking the position and weight on a tire using an electrostatic marking nozzle. CONSTITUTION: An apparatus for adjusting a balance of a tire includes a conveyor device(20) for conveying a tire(21). A rotating table is aligned on the conveyor device(20) and rotates the tire(21) at a high speed in order to generate unbalance when the tire(21) is conveyed thereon. A balance sensor is installed at one side of the tire(21) so as to detect the weight of an unbalanced portion of the tire(21). A controller receives a signal from the balance sensor. A display panel displays data detected by the balance sensor. A marking device(30) is installed at one side of the conveyor device(20) in order to mark a weight attachment position and weight on the tire(21).
Patent KR-20030086932-A (KR)
Title: 트랜지스터용 게이트 구조체 및 그 제조 방법
IPC: H01L29/49
Filed: 2003-05-06
Abstract: 본 발명은 트랜지스터의 게이트 구조체를 제조하기 위한 방법 및 게이트 구조체에 관한 것이며, 부가의 장벽은 실리콘 옥사이드층을 증착하기 전에 게이트 구조체의 금속층 상에 발생된다.  실리콘 옥사이드층을 증착하기 전에 상기 장벽층을 금속층 상에 증착함으로써, 실리콘 옥사이드층의 증착중 금속의 산화는 방지된다.  따라서 금속층의 전도성의 감소 또는, 승화된 금속 옥사이드에 의한 금속에서의 손실은 방지된다.  따라서 게이트 구조체 또는 트랜지스터의 전도성은 특히 더욱 개선된다.  실리콘 옥사이드 캡을 사용함으로써, 회로 내에서 부가적으로 장해를 주는 커플링 효과는 분명 줄어든다.
Patent KR-20040097685-A (KR)
Inventor: KIM NAK CHAN
IPC: F42C13/00
Filed: 2003-05-12
Abstract: PURPOSE: A system for inputting power source and explosion condition signals to an electronic fuse is provided to simplify the structure of a shooting control unit and the electronic fuse, and reduce errors in signal transmission. CONSTITUTION: A system for inputting power source and explosion condition signals to an electronic fuse is composed of a shooting control unit(100) synthesizing the power source signal and the explosion condition signal and transmitting the synthesized signal to the electronic fuse, and a signal receiving unit(200) installed at the electronic fuse. The shooting control unit includes a power pulse generator(120) for generating the power source signal, an explosion condition signal receiving unit(150), a pulse delaying unit(130) delaying and outputting the power source signal, a gate(140) for outputting the explosion condition signal, a synthesizing circuit(160) for synthesizing the power source signal and the explosion condition signal, and a driving switch(110) for driving the gate and the power pulse generator. The signal receiving unit includes a signal separating circuit(210) for separating the power source signal and the explosion condition signal from the synthesized signal, a power source element(230) charging the power source signal, a memory unit(250) storing the explosion condition signal, and a reset unit(240).
Patent KR-20040099662-A (KR)
Inventor: PYUN MU SEONG
IPC: H04M1/22
Filed: 2003-05-19
Abstract: PURPOSE: A method for setting color of a key input unit of a mobile terminal is provided to change the color of the key input unit according to personality or a taste of a user of a mobile terminal. CONSTITUTION: When a user presses a menu key of a key pad, a controller controls a display unit to display a menu(201). When the user selects setting of the color of the key input unit(202), the controller controls the display unit to display kinds of colors for the key input unit(203). When the user selects the 'red' color(204), the controller sets a GPIO(General Purpose Input/Output) value corresponding to the red color(205). The controller stores the set GPIO value in a memory(206), and changes and sets the key input unit in the red color(207).
Patent KR-20040102580-A (KR)
Inventor: YOON JEONG RAN
IPC: G09G3/30
Filed: 2003-05-28
Abstract: PURPOSE: A driver apparatus of an organic light emitted diode(OLED) and a method for driving an OLED are provided to reduce the driving current by drastically decreasing the amount of required current in precharge period. CONSTITUTION: A driver apparatus of an organic light emitted diode(OLED) includes a precharge current source(200), a driving current source(300) and a discharge device(400). The precharge current source supplies the precharge current to the OLED so as to apply the threshold voltage to the OLED in precharge period. The driving current source supplies the driving current to the OLED so as to apply the driving voltage higher than the threshold voltage to the OLED in a driving period. And, the discharge device discharges the charges in the OLED to drop the voltage applied to the OLED to a critical voltage lower than the threshold voltage in a discharge period.