baber/WOPTO huggingface dataset:
Patent KR-20030030734-A (KR)
Title: Gas Turbine Generator with Fogging System
Inventor: JUNG YEONG TAE
IPC: F02C3/30
Filed: 2001-10-12
Abstract: PURPOSE: A gas turbine engine is provided to increase output of the gas turbine engine by using a fogging phenomenon for increasing density of the air through the use of change of latent heat of water. CONSTITUTION: A gas turbine engine(200) comprises a fogging system where water is atomized, through the use of water atomizer nozzles(110), to the air introduced from an air intake unit of the gas turbine engine, and particles of water droplet are contained in the air being introduced into the gas turbine engine for combustion. An air intake path(150) is formed by extending the front end of the air intake unit of the gas turbine engine, and the water atomizer nozzles are arranged within the air intake path. The water atomizer nozzles are connected to a water tank(120) and a high pressure tank(130) through pipelines(120P,130P), respectively.
Patent KR-20030033751-A (KR)
Title: digital PLL circuit error detecting equipment and controlling method therefore
Inventor: PARK MIN SANG
IPC: H03L7/00
Filed: 2001-10-25
Abstract: PURPOSE: An apparatus for detecting an error of a digital PLL(Phase Locked Loop) circuit and a control method thereof are provided to improve error detection characteristics of the digital PLL circuit by diagnosing an error part of the digital PLL circuit in real time. CONSTITUTION: According to a PLL(Phase Locked Loop) circuit generating a network synchronization frequency signal and then supplying it to a network, a DSP(Digital Signal Processor) processor detecting a VCXO output signal being output from the PLL circuit and an output signal of a D/A(Digital/Analog) converter(9) and then outputting abnormal state of the PLL circuit as a signal bit. A DRAM(3) stores the signal bit inputted from the DSP processor in an error detection bit. And a MCU(Micro Control Unit)(5) judges the error of a PLL circuit part(1) by Polling the error detection bit of the DRAM periodically and transmits the judgement result to an operator PC.
Patent KR-20030037511-A (KR)
Title: Method of excluding poison from Oriental Aconifi
Inventor: JANG HAN SEOB
IPC: A61K36/71
Filed: 2001-11-06
Abstract: PURPOSE: Provided is a detoxification method of Aconitum carmichaeli Debx. through deacetylation, debenzoylation, oxidation, etc., thereby removing toxic material contained in Aconitum carmichaeli Debx. completely. CONSTITUTION: The detoxification method of Aconitum carmichaeli Debx. is characterized by removing impurities or dirts from Aconitum carmichaeli Debx. with a sieve, and steaming Aconitum carmichaeli Debx. at 130-150 deg.c under pressure condition for 10 hours.
Patent KR-20030037599-A (KR)
Title: mechanical timer
Inventor: MYUNG SUN SEUNG
IPC: H01H43/00
Filed: 2001-11-06
Abstract: PURPOSE: A timer is provided to be capable of changing a defected micro switch without separating a switch guide and of adjusting a timing interval of a variable cam without using a dedicated jig. CONSTITUTION: A frame(10) is connected to plural support bars(12) and forms a body. A plurality of switch guides(20) are disposed at an upper part of the frame(10). A plurality of micro switches(30) are installed at the switch guides(20) respectively and control various functions. A reset cam(40) and plural variable cam(60) are disposed at the frame(10) so as to be rotated via a shaft(40) and operate the micro switches(30) at a predetermined cycle, respectively. A motor(70) drives the reset cam(50) and the variable cams(60) through a motor gear(71) and a cam gear(72) and is attached at the frame(10).
Patent KR-20010113022-A (KR)
Title: 유체 압력차에 의해 제어되는 정수위밸브
Inventor: CHO JIN SIK
IPC: F16K21/18
Filed: 2001-11-07
Abstract: 본 발명은 유체 압력차에 의해 제어되는 정수위밸브에 관한 것으로써, 더욱 상세하게는 유체의 유입이 안내되는 유입구와 유체의 유출이 안내하되 유출구가 수직으로 형성되고 상기 유출구는 수직으로 유체를 차단시키는 밸브시트로 형성되며 상기 밸브시트 상단에는 다이아프램이 위치되고 상기 다이아프램의 상측공간은 밸브몸체와 함께 유압챔버가 형성되며 상기 유압챔버의 유압변화로 다이아프램이 수축, 팽창되어 유체의 흐름을 제어시키는 유체 압력차에 의해 제어되는 정수위밸브에 있어서, 상기 유압챔버와 유입구를 연결시키는 유입수로관과, 상기 유압챔버와 외부유로를 연결시키는 유출수로관과, 상기 유출수로관에 삽입되는 핀몸체와, 밸브몸체에 의해 형성된 조절챔버내에 삽입된 스프링에 의해 탄지되고, 상기 조절챔버에 의해 안내되어 하단으로 지속적인 힘을 가하며 유출수로관의 유로를 개폐시키는 핀머리로 형성된 조절핀과, 상기 조절핀의 핀몸체 하단에서 조절핀과 접촉 형성된 캠과, 상기 캠과 아암에 의해 연결된 부구로 형성되어 수조내의 수위에 따라 부구의 부력이 캠의 회전운동으로 전달되어 상기 조절핀을 수직운동시키는 제어캠으로 구성되어, 상기 수조내의 수위가 감지되는 제어캠에 의하여 유압챔버내의 압력을 변환시켜 상기 다이아프램을 수축 팽창시킴에 따라 유입구와 유출구의 유로가 제어되어 수조내의 수위가 제어되는 것을 특징으로 하는 유체 압력차에 의해 제어되는 정수위밸브에 관한 것이다. 
     이에 의해 밸브내로 인입되는 오물이 걸러져 밸브고장이 방지되고 수조내의수위가 제어캠에 의해 직접적으로 전달되어 밸브의 개폐가 이루어지는 유체 압력차에 의해 제어되는 정수위밸브가 제공되는 이점이 있다. 
     또한 유출수로관과 조절챔버의 틈새구조에 의하여 제어효율이 개선되는 유체 압력차에 의해 제어되는 정수위밸브가 제공되는 이점이 있다.
Patent KR-20030038039-A (KR)
Title: preparation method of binder for uv protector
Inventor: CHOI CHANG HYEON
IPC: A61K8/19
Filed: 2001-11-08
Abstract: PURPOSE: A process of preparing a colloidal binder for an ultraviolet screening agent is provided. Therefore, the binder exhibits excellent ultraviolet screening effect when blended with an ultraviolet screening agent and a stabilizer. CONSTITUTION: Alumina powder(Al2O3) is mixed with an aqueous solution of sodium hydroxide at 50 to 100deg.C at a stirring speed of 300 to 1,000rpm for 6 to 48hr and then neutralized with hydrochloric acid to produce a binder for an ultraviolet screening agent. A composition for shielding ultraviolet is characterized in that it contains the binder and 2Na-EDTA. For an example, 10g of Al2O3 having a particle size of 5 microns or less and a purity of 99.9% is mixed with 48g of sodium hydroxide having a purity of 99.5% or more at 80deg.C and 500rpm for 24hr to produce a slurry. Thereafter, the slurry is added with 40ml of HCl to produce a colloidal binder, and the colloidal binder is agitated with 2g of 2Na-EDTA at 200rpm for 30min.
Patent KR-20030041049-A (KR)
Title: Sealing apparatus for plastic film
Inventor: HAM UI SHIN
IPC: B29C65/02
Filed: 2001-11-19
Abstract: PURPOSE: A sealing apparatus for plastic film is provided to prevent floating or disconnection regardless of the shape of the heating material by holding with a magnetic plate, and to increase the productivity by sealing with momentary thermal-bonding. CONSTITUTION: A sealing device is composed of a heating supporting plate(30) having a heating wire(50) heating in connecting power, a support member(31) supporting the heating wire, release cloth(32) covering the support member and the heating wire, and a press plate(40) placed on the heating supporting plate. A magnetic plate(34) mounting insulating cloth(33) is inserted between the heating wire and the support member. Floating or disconnection of the heating wire is prevented by supporting the heating wire with the magnetic plate during thermal bonding of plastic film.
Patent KR-20030042267-A (KR)
Title: method for manufacturing prestressed composite beam by division mode
Inventor: PARK U YEONG
IPC: E01D2/02
Filed: 2001-11-22
Abstract: PURPOSE: A manufacturing method of a prestressed composite beam is provided to have a good command of chamber for a joint and to place compressive force evenly. CONSTITUTION: The manufacturing method of a prestressed composite beam comprises the steps of: chambering a spot to be divided using a unified steel beam according to a plan of a prestressed beam in a factory; adding preflexion load on the chambered steel beam; at the state of adding preflexion load, placing and curing lower casing concrete on a spot excluding a split line out of a lower flange of a steel beam; after curing the lower casing concrete surface, removing preflexion load and cutting off a part where lower casing concrete isn't placed into many members; lining up each member on a temporary support in a job site, and fixing a joint of each member to the ground by a wire rope; lifting up the temporary support to be chambered, then placing and curing joint casing concrete(8) on a joint of each member; after curing the joint casing concrete(8), descending the temporary support slowly and adding compressive force on joint concrete.
Patent KR-20030042311-A (KR)
Inventor: JU MU JEONG
IPC: H01S3/067
Filed: 2001-11-22
Abstract: PURPOSE: An erbium-doped fiber amplifier is provided to be capable of maintaining an output optical strength of an existence channel from an optical fiber amplifier in a rapid time by compensating a gain in-homogeneity. CONSTITUTION: The first amplification stage(221,222,223,224,225) receives an input optical signal and forward and backward excitation lights and amplifies the input optical signal by an energy which is generated when erbium ions are excited by the excitation lights and are returned to an original energy level. A pre-process means performs a gain equalization process operation and an attenuation process operation of a light strength with respect to a signal amplified by the first amplification stage. The second amplification stage(271,272,273,274,275) receives a light signal processed by the pre-process means and the forward and backward excitation lights and again performs an amplification operation. A plurality of laser diodes generate a forward or backward excitation light needed for the first and second amplification stages, respectively. An input light signal detecting device(23) receives and separates a part of the input optical signal by a 50:50 ratio and converts one of separated signals into an electric signal via a filtering process for compensating a gain in-homogeneity and the other one into an electric signal without the filtering process. A laser diode controller(24) generates a forward laser diode control voltage of the first amplification stage using an output signal of the input light signal detecting device converted via the filtering process and the remaining laser diode control voltage using an output signal of the input light signal detecting device converted without the filtering process.
Patent KR-20030042362-A (KR)
Title: keyboard/mouse combination apparatus
Inventor: YUM SANG HYEOK
IPC: G06F3/02
Filed: 2001-11-22
Abstract: PURPOSE: A device for combining a keyboard with a mouse is provided to simply input a control signal during transfer by connecting the keyboard and the mouse with an external selection signal input terminal prepared to a portable electronic device. CONSTITUTION: The device(100) includes the keyboard(110), the mouse(120), a switching part(130), a sensor(140), an output port(150), and a connection port(160). The keyboard and the mouse are formed in one body. The keyboard(100) is folded and connected with each other, and includes a plurality of sub panels having character input keys. The mouse(120) has a click button to input a selection signal. The sensor(140) detects the folding state of the keyboard(110) and transmits the information to the switching part(130). The switching part(130) selectively outputs the signal outputted from the keyboard(110) and the mouse(120) by receiving the voltage outputted from the sensor(140). The output port(150) transfers the signal outputted from the switching part(130) to the connection port(160) transmitting/receiving the signal by connecting to the input port(210) of the portable information device(200).
Patent KR-20020018175-A (KR)
Inventor: BYUN SEONG GWANG
IPC: B01D39/16
Filed: 2001-11-28
Abstract: PURPOSE: A HEPA filter is provided which is capable of capturing, thus removing micro allergen materials having a size of 0.3 micron or less by controlling alignment and pore sizes of micro fiber which consists of polyester and nylon multiple yarn. CONSTITUTION: The HEPA filter using multi-layered micro fiber for protecting allergen comprises a cover part(5) which maintains a shape of a filter and functions as a pre-filter; a first layer filtration part(6) in which micro fiber bundle of micro pored cloth which has a pore size of 100 microns and is a polyester and nylon multiple yarn is aligned in a zero angle to one direction; a second layer filtration part in which micro fiber bundle of micro pored cloth which has a pore size of 10 microns and is a polyester and nylon multiple yarn is aligned oppositely to the alignment direction of the first filtration part; and a third layer filtration part(8) in which micro fiber bundle of micro pored cloth which has a pore size of 1 micron and is a polyester and nylon multiple yarn is aligned in a direction different from the first and second layer filtration parts, and removes and captures fine dust or allergen materials having a size of 0.3 micron or less.
Patent KR-20020052959-A (KR)
Inventor: HARADA TOSHIKAZU
IPC: H05K3/46
Filed: 2001-12-21
Abstract: PURPOSE: A printed wiring board and a manufacturing method thereof are provided to improve an interlayer connection and a fabrication method. CONSTITUTION: A printed wiring board formed by interconnected layers comprises an insulator film(23), wherein at least one via hole(24) is formed in the insulator film(23), and a conductor pattern(22) located on the insulator film(23), wherein the interconnected layers includes a conductor pattern, and a solid conductive material which includes metal components, located in the via hole(24), wherein the solid conductive material includes a first type of conductive material and a second type of conductive material, wherein the first type of conductive material includes a metal, and the second type of conductive material includes an alloy formed by the first metal and the conductor metal.
Patent KR-20030055933-A (KR)
Title: Method for operating electroluminescent display panel
Inventor: LEE HAN SANG
IPC: H05B44/00
Filed: 2001-12-27
Abstract: PURPOSE: A method for driving a field emission display panel is provided to remove blurring phenomenon on a screen by discharging electric charges of a capacitor of a previous frame in a constant block of a present frame to turn off a field emission device during a constant time. CONSTITUTION: A normal block and a black data block is assigned when a data voltage is applied to a source line. A real data voltage is applied to the normal block and a black data voltage is applied to the black data block. A field emission portion is turned off in a constant block and a display operation is performed by applying the black data voltage to a plurality of gate lines when a gate signal is applied to activate sequentially the gate lines. The gate signals are divided into the first gate signal(200) and the second gate signal(300) in one frame and the divided gate signals are applied to the gate lines.
Patent KR-20030056023-A (KR)
Title: Method for physical fault checking and OAM cell creation in ATM OAM
Inventor: PARK JEONG JIN
IPC: H04L12/28
Filed: 2001-12-27
Abstract: PURPOSE: A method for inspecting a physical layer of an asynchronous transfer mode OAM and generating an OAM cell are provided to efficiently execute an OAM function by reducing load of a CPU. CONSTITUTION: An initial flag is set up by considering a delay time until a point that update for state information to connection is completed(S41-S45). An alarm generating process is driven so that an OAM(Operation Administration and Maintenance) alarm to the physical alarm generated connection is transmitted to an upper application layer and an OAM cell is generated(S46-S52). It is confirmed whether a physical flag is in a transient transition state(S53). A unit fail check routine of an AADU a physical fail check routine of a PMC are executed(S54-S55). It is confirmed whether a physical flag is '1'(S56). If not, the physical flag is set as '3'(S57). If so, the physical flag is set as '2'(S58). The alarm generating process is driven so that an OAM alarm to the physical alarm generated connection is transmitted to an upper application layer and an OAM cell is generated(S59-S65). The physical flag is changed(S66-S67). A physical inspecting task is standby for an alarm set period(S68).
Patent KR-20030058195-A (KR)
Title: Storage capacitor of liquid crystal display
Inventor: KIM YONG WAN
IPC: G02F1/136
Filed: 2001-12-29
Abstract: PURPOSE: A storage capacitor of a liquid crystal display device is provided to prevent the horizontal short generated between stepped portions of data lines and stepped portions of storage electrodes and omit an active layer for preventing vertical short of storage capacitors by protruding through-holes on the storage electrodes to pixel areas, thereby reducing the reduction of the storage capacitors and minimizing the reduction of the aperture ratio. CONSTITUTION: A storage capacitor of a liquid crystal display device includes storage electrode lines(6) perpendicularly intersecting data lines(4) via a gate insulating film and storage electrodes(11) overlapped with the storage electrode lines by predetermined parts. The storage electrode lines are formed in the gate line forming step and the storage electrodes are formed in the data line forming step. The storage electrodes are protruded to parts of pixel areas(20) and formed with through-holes(8b) around the protruded portions to be electrically connected to pixel electrodes.
Patent KR-20030058548-A (KR)
Inventor: PARK IN HO
IPC: G02F1/13357
Filed: 2001-12-31
Abstract: PURPOSE: A back light unit is provided to stably guide a panel even if deviation in mold frames is generated by forming a panel guide in a spring shape. CONSTITUTION: A panel guide(24) is formed at a mold frame(25) for guiding a panel(26). The panel guide is formed in a spring shape and prevents the panel from leaning to one side by contacting with one end of the panel. A color filter is arranged at an upper part of the panel and a thin film transistor array is arranged at a lower part. Polarizing plates are formed at an upper part of the color filter and a lower part of the thin film transistor array respectively.
Patent KR-20010071730-A (KR)
IPC: E01C11/14
Filed: 1999-07-06
Abstract: A process for the on-site articulated imbrication between concrete slabs in which joints are formed, laying during the works, along the joint lines, a simple in mesh reinforcing device with a cutting and bending pattern already prepared in the workshops. In this way, advantage is taken from the shrinking phenomenon to obtain an alternative indentation along the joints of the adjacent slabs continuously in concrete, capable of satisfactorily producing a joint type link between them. The process is complemented with a concrete separating component facilitating crack formation and preventing the arrival of water to the platform and that may be fastened to the mentioned device. The invention is applicable to concrete paving on roads, motorways and port areas for the storage of goods, and allows road metalling to be designed without the need of bases and sub-bases. <IMAGE>
Patent KR-20010073203-A (KR)
Title: 디포스폰산을 함유하는 조성물
IPC: A61K9/30
Filed: 1999-10-01
Abstract: 본 발명은 활성 물질로서 디포스폰산 또는 이의 생리학적으로 상용가능한 염을 함유하는 고체 약학 투여형에 관한 것으로, 이때 활성 물질은 내부상에 선택적으로 약학 보조제와 함께 과립 형태로 존재하고 외부상은 투여형의 총 중량에 대해 5중량% 미만의 스테아르산 형태의 윤활제를 함유한다.
Patent KR-20010080328-A (KR)
IPC: A23B4/03
Filed: 1999-10-26
Abstract: 항산화제를 사용하지 않아도 충분히 지질열화를 방지할 수 있는 크릴새우 건조분말 과립체를 제공한다. 이 과립체는 크릴새우의 전체성분을 함유하는 것을 특징으로 한다. 원료 크릴새우 유래의 단백분해효소가 완전히 무능력하게 되어있다. 원료 크릴새우의 단백질의 변성이나 단백질 분해효소의 무능력화를 위해 가해지는 수단은 가열과정이 유일하다. 제조공정에 있어서, 수분제거나 단백분해효소 무능력화나 저해의 목적으로 하등의 약품처리가 없고 더구나 폐기액의 발생이 전혀없는 제조방법에 의해 제조된다. 이 제조방법은 어획한 크릴새우를 가볍게 탈수하여 이것을 분쇄해서 가열건조하는 공정으로된 제조방법이다. 
     즉 가열만으로 크릴새우로부터 수분만을 무능력하게하고, 그 이용용도를 확대하고 또한 보존성까지 부여시킴으로써 소위 폐기물의 발생이 없는 폐기물 제로배출을 
     실현한 제법 및 제품이다.
Patent KR-20010102949-A (KR)
IPC: H01F27/30
Filed: 1999-11-29
Abstract: 유도 장치(10)의 자기 코어는 유도 장치(10)를 통과하고 전기 권선(18, 19)의 주위를 둘러싸며 연장되는 복수의 와이어(17)로 형성된다. 와이어(17)의 단부는 전기 권선(18, 19) 주위에 형성되어 접속되고, 완결된 자기 회로를 형성하는 자기 코어(16)와 권선(18, 19)을 함께 감싸도록 접속된다. 유도 장치(10)는 2개 이상의 권선, 오직 하나의 권선을 갖는 초크 코일 또는 다른 유도 장치를 구비한 변압기일 것이다. 전기 권선(18, 19)은 와이어 자기 코어(16)에 직접 감기거나 별도로 형성된 후, 자기 코어(16)상에 배치된다. 설치 포스트(14) 또는 그런 종류의 다른 것은 코어(16)내에 묶여 유도 장치(10)를 장착하는데 사용될 수 있다. 또한, 튜브(43) 및/또는 큰 로드(38)는 유도 장치를 지지 하기 위해 코어내에 결합될 수 있다.
Patent KR-20010101118-A (KR)
IPC: F16H61/08
Filed: 2000-09-20
Abstract: 자동 변속기는 입력용 제1 회전부재(3), 제1 회전부재(3)와 동일한 축을 가지는 출력용 제2 회전부재(6), 제1 회전부재(3)와 동일한 축을 가지는 제3 회전부재(8) 그리고 제1 회전부재(3)의 회전을 제2 회전부재(6)에 전달하기 위해 제3 회전부재(8)에 설치된 회전 전달요소(10)를 포함하여 제3 회전부재(8)가 정지된 상태에서 제1 회전부재(3)의 회전을 초과하는 소정의 감속비를 가지고 제1 회전부재(3)의 회전 방향으로 제2 회전부재(6)가 회전되도록 한다. 감속비는 제1과 제3 회전부재(3,8)의 회전수 차이가 크게 됨에 따라 증가된다.
Patent KR-20010080763-A (KR)
Title: 아실포스핀 옥사이드 광경화 피복 연마제
IPC: B24D3/28
Filed: 1999-12-08
Abstract: 본 발명은 연마 공구가 비스(2,4,6-트리메틸벤조일)페닐포스핀 옥사이드 광개시제를 포함하여, 결합제의 경화도가 보다 클 수 있는 방사선 경화성 수지 결합제를 사용하여 제조된, 피복 연마제와 같은 연마 공구에 관한 것이다.
Patent KR-20010109278-A (KR)
IPC: B32B17/10
Filed: 2000-01-11
Abstract: The invention relates to a glass-plastic composite film and a method for producing same. Conventional glass-plastic composite films are tailored specifically to the requirements of their intended use. The invention aims to create a new composite film which can be used in as wide a range of applications as possibly and is uncomplicated to produce. To this end a glass-plastic composite film is coated with a liquid phase polymer without the use of adhesive. Such a film is characterized by a high-quality surface finish and low optical retardation. It is particularly suitable for the production of illuminated displays on the basis of liquid crystals or light-emitting layers.
Patent KR-20020010569-A (KR)
IPC: A63B53/04
Filed: 2000-06-02
Abstract: 이종(異種)의 구조를 갖는 2 재료 웨이트(70)를 포함하는 한정된 내부 공동(28)이 구비된 골프채 헤드(12)가 개시된다. 또한, 본 발명의 일부로서 2 재료 웨이트(70)를 골프채 헤드(12)에 부가하는 방법이 개시된다. 이 방법은 내부 공동(28) 내에서 이종의 웨이트 구조가 생성될 수 있도록 가열, 진동의 부과 및 냉각 공정을 포함한다. 2 재료 웨이트(70)는 바람직하게 다수의 텅스텐 구(54)와 비스무트 땜납(60)으로 구성된다.
Patent KR-20030060635-A (KR)
Inventor: LEE KYUNG BOK
IPC: G06Q99/00
Filed: 2002-01-10
Abstract: PURPOSE: An Internet time capsule is provided to offer precious information to a person on a proper time for the purpose of giving a motive and enhancing consciousness. CONSTITUTION: An information provider(10) inputs the information contents to be offered, an offering time, and an offering method to a web server(20) through the Internet. If the information is important or is attached with an article and goods, the information is notarized by an external certification organization(30). The information is informed to an information receiver(50) on a proper time desired by the information provider(10) through various media such as an e-mail, a post, and a telephone by a time capsule system(40). The information receiver(50) receives the information according to a condition fixed by the information provider(10) by connecting to the time capsule system(40), and a progress process and a result are stored in a post-management system(60).
Patent KR-20020033664-A (KR)
Inventor: TAE HEUNG SIK
IPC: G09G3/296
Filed: 2002-01-30
Abstract: PURPOSE: A driving method and a driving apparatus are provided, which increase a brightness and a luminescence efficiency of an AC type plasma display panel(PDP) at the same time by applying a sustain voltage to a sustain electrode and at the same time by applying a positive voltage to an address electrode. CONSTITUTION: The plasma display panel(PDP) has a number of cells to display an image, and each cell constitutes one frame with a plurality of sub fields to display a gray level in the PDP having an address electrode and a pair of sustain electrodes. And each sub field is constituted with an initialization period, an address period and a sustain period. The driving method of the PDP includes a step of generating a sustain discharge by applying a voltage between the sustain electrodes, and a step of increasing a discharge volume by applying a positive voltage to the address electrode during at least a part of the period when the sustain discharge continues. The voltage applied to the address electrode is turned off before wall charges are accumulated on the sustain electrode in order not to hinder the formation of the wall charges by a discharge between the sustain electrodes.