baber/WOPTO huggingface dataset:
Patent KR-20080001461-A (KR)
Title: Method for forming al wiring layer in semiconductor device
Inventor: RYU IN CHEOL
IPC: H01L21/28
Filed: 2006-06-29
Abstract: A method for forming an aluminum wiring layer in a semiconductor device is provided to prevent deterioration of characteristics due to aluminum diffusion by burying a seam of a contact plug with a diffusion barrier material. A lower conductive layer pattern is formed on an upper surface of a semiconductor substrate(30). An interlayer dielectric(34) is formed to cover the lower conductive layer pattern. A contact hole for exposing a part of a lower conductive layer is formed by etching the interlayer dielectric. A conductive plug is formed within the contact hole in order to be connected to the lower conductive layer. A diffusion barrier(38) is formed on the conductive plug. An aluminum wiring layer(40) is formed on the semiconductor substrate including the diffusion barrier in order to be connected electrically through the conductive plug to the lower conductive layer.
Patent KR-20080002317-A (KR)
Title: Method for improving qos in cooperation among terminals in ad-hoc network
Inventor: LEE JAE YOUNG
IPC: H04L12/24
Filed: 2006-06-30
Abstract: A QoS(Quality of Service) improvement method through cooperation between terminals in an ad hoc network is provided to solve QoS deterioration of an application program sensitive to delay time in the ad hoc network, through cooperation with neighboring terminals, thereby ensuring QoS. If a predetermined terminal is using a service which requires particular QoS(300), the required QoS is stored in a self terminal list(301). Self QoS requirements are periodically notified to other neighboring terminals(302). Satisfaction at the currently performed service is notified to the other terminals(303).
Patent KR-20080003061-A (KR)
Title: Method of fabricating separating wall of organic elctroluminescence display device
Inventor: MOON JONG SEOK
IPC: H05B33/22
Filed: 2006-06-30
Abstract: A method for forming a partition of an organic electro luminescence display device is provided to simplify manufacturing processes and costs by forming the partition by using two masks. A plurality of pixels are comprised in a substrate(220). An auxiliary electrode(233) is formed between the pixels on the substrate. An electrode(221) is formed on the entire surface of the substrate including the auxiliary electrode. A partition(231) composed by an inorganic material is formed between the pixels of the substrate.
Patent KR-20080003064-A (KR)
Title: Gate driver
Inventor: KIM BINN
IPC: G09G3/36
Filed: 2006-06-30
Abstract: A gate driver is provided to execute a normal operation by exchanging shift registers generated an erroneous operation. A gate driver includes plural stage pairs(ST1-STn), at least one or more dummy stage pairs(DST), and at least one or more dummy lines(L). The plural stage pairs output sequentially shift signals. The dummy lines are connected to the dummy stages so as to drive the dummy stages instead of at least one of the plural stage pairs. When stages in which normal scan signals are not generated, gate lines as output lines of abnormal stages are connected to the dummy stage pairs through the dummy lines such that an LCD(Liquid Crystal Display) device displays normal images.
Patent KR-20080004914-A (KR)
Title: Reinforcing fiber panel pre-stressing wrapping device and pier reinforcing method using thereof
Inventor: KIM HYUNG MO
IPC: E01D19/02
Filed: 2006-07-07
Abstract: A reinforced fiber panel prestressing wrapping apparatus is provided to carry and install easily, to apply to various circumferences in a construction site and to wrap reinforced fiber panels around a pier continuously without cutting by using reinforced fiber panels produced in the uniform quality in a factory. A reinforced fiber panel prestressing wrapping apparatus using a reinforced fiber panel comprises a caterpillar rail(100) installed along the circumference of a pier in a horizontal direction and formed in a circular or elliptical shape as a whole, a driving unit(200) placed over the caterpillar rail to revolve round the circumference of a pier along the caterpillar rail, a vertical pipe-shaped vertical post(300) coupled to the lower part of the driving unit integrally and hollowed inward, an elevator(400) installed to the inside of the vertical post and moving upward and downward, and a reinforced fiber loading box(500) installed to the outside of the vertical post, coupled with the elevator integrally and discharging the loaded reinforced fiber plate.
Patent KR-20080007806-A (KR)
Title: Method of parallel bit test using error correcting code engine and apparatus thereof
Inventor: PARK BOK GUE
IPC: G11C29/00
Filed: 2006-07-18
Abstract: A method for parallel bit test using an ECC(Error Correcting Code) engine and an apparatus thereof are provided to check PASS or FAIL accurately when a bit error of several bits is founded by using the ECC engine. A memory cell array(100) includes a parity cell region and a data cell region including m memory cells written with m bit data for PBT(Parallel Bit Test) test. A parity encoder(400) generates n parity bits on the basis of each data written in the m memory cells. An ECC(Error Correcting Code) engine(300) generates test result data on the basis of the m bit data and the n bit data. N parity bits generated in the parity encoder are written in n memory cells included in the parity cell region.
Patent KR-20080010523-A (KR)
Title: A fixing structure between passenger air bag and cowl cross bar
Inventor: PARK CHUN SEOK
IPC: B60R21/205
Filed: 2006-07-27
Abstract: A structure for fixing a passenger air bag to a cowl cross bar is provided to prevent an open direction of the passenger air bag from being varied when impact is applied to the passenger air bag. A structure for fixing a passenger air bag to a cowl cross bar comprises a first bracket for fixing the cross bar and a second bracket(20) for fixing the passenger air bag. The first bracket is formed with a first bolt hole formed at the front end portion thereof, and a hook formed behind the first bolt hole. The second bracket has a hook(24) at one end thereof and a second bolt hole(26) having an oval shape. The second bolt hole is provided with a pair of locking members(28) therein. The hook of the bracket is inserted into the hook hole of the first bracket. The locking members formed at the second bolt hole protruded while facing each other.
Patent KR-20080010555-A (KR)
Title: Compressor
Inventor: LEEM KEON SOO
IPC: F04B27/08
Filed: 2006-07-27
Abstract: A compressor is provided to raise the durability and the efficiency of the compressor by receiving a sufficient amount of refrigerant when a drive shaft rotates at a high speed. A compressor comprises a drive shaft(150) having a pathway(151). A swash plate(160) is slantingly coupled with the drive shaft(150) such that the swash plate rotates in a swash plate chamber(136). Front and rear cylinder blocks(130,140) are provided with intake pathways(132,142). A plurality of pistons(170) perform reciprocate movement in cylinder bores(131,141). Front and rear housings(110,120) have outlet chambers(111,121), respectively. Valve units(190) are interposed between the front and rear cylinder blocks(130,140) and between the front and rear housings(110,120). Bolt coupling holes(138,148,194) are formed in the front and rear housings(110,120), the front and rear cylinder blocks(130,140), and the valve units(190). A partition(122) is formed along a circumference of one of the outlet chambers(111,121).
Patent KR-20080010698-A (KR)
Title: Method and apparatus of heating for battery
Inventor: YOON JUN ILL
IPC: H01M10/6571
Filed: 2006-07-27
Abstract: A method for heating a battery device having a plurality of battery cells, and an apparatus for heating a battery device are provided to improve the low temperature characteristics of a battery without using additional equipment and to allow the balancing of SOC and the heating of a battery to be carried out simultaneously. A method for heating a battery device comprises the steps of (200) sensing the temperature of a battery device; and (208) heating the battery device by carrying out a forcible discharge function for the balancing of SOC if the sensed temperature is determined to be below a certain temperature. Preferably the forcible discharge process is carried out by (204) measuring the SOC to the each battery cell; and (208) carrying out the forcible discharge if the SOC is above the preset discharge limit. Preferably the forcible discharge is carried out through a heat radiating element.
Patent KR-20070017036-A (KR)
IPC: F01L1/18
Filed: 2006-08-03
Abstract: 본 발명은, 외부 레버(3) 및 상기 외부 레버 사이에 배치된 내부 레버(4)를 갖는 내연기관의 밸브 트레인의 스위치 가능한 캠팔로워(1)에 관한 것이다. 이 캠팔로워(1)는 하면(5)에 일단(6)에는 가스 교환 밸브를 위한 로케이팅 요소(7)를 구비하며 타단(8)에는 지지요소를 위한 피봇 베어링(9)를 구비한다. 상기 레버들(3)(4)은 한 단부(6)에서 공통의 축(10)상에 연장된다. 상기 축(10)에 대향하는 다른 단부(8)에는 종축으로 연장되며 커플링 수단을 위해 캠 기본원에서 서로 일직선으로 정렬되는 수용부들(10a)(10b)이 마련된다. 상기 외부 레버(3)의 측벽(2)은 그 상면(11)에 편심캠을 위한 접촉면(12)을 갖는다. 상기 각 상면(11)으로부터 세그먼트형의 칼라(13)가 안쪽으로 돌출하고, 이 칼라는 각 접촉면(12)과 유닛을 이루며, 상기 칼라(13)의 해당 하면(14)은 커플링된 경우 상기 내부 레버(4)의 인접 아암(2a)의 상면(16)의 상보적인 스톱면(15) 상에   인접한다. 따라서, 간단한 방식으로, 커플링된 경우를 위한 상기 수용부들(10a)(10b)의 일직선 정렬이 구현된다.
Patent KR-20080013155-A (KR)
Title: Method of separating positive electrode from unit cell for the stacked type polymer-condenser using insulating resin local coating
Inventor: KO KWANG SUN
IPC: H01G9/15
Filed: 2006-08-07
Abstract: A method of separating a positive electrode from a unit cell for a stacked type polymer-condenser through local coating of insulation resin is provided to prevent excessive use of insulation resin by locally applying the insulation resin only at an interface between a positive electrode and a negative electrode. A dielectric layer is formed in an etched aluminum foil, and, after a re-forming process is completed, an insulation resin is applied around a positive electrode of a unit cell so as to prevent short of a positive electrode(18) and a negative electrode(19). A separating line(20) is displayed on the etched aluminum foil to separate the positive electrode from the negative electrode, and a small quantity of the liquid insulation resin is applied on both sides of the positive electrode adjacent to the separating line in the step of applying the insulation resin.
Patent KR-20080013202-A (KR)
Title: A pushed prevent system for a vehicle at slope
Inventor: BYUN SEOK JU
IPC: B60T7/12
Filed: 2006-08-07
Abstract: A slip prevention system for a vehicle on a slope is provided to drive forward the vehicle without engine stall by preventing the vehicle from slipping on a slope. A slip prevention system for a vehicle on a slope comprises a vehicle speed sensor(600) sensing a running speed of the vehicle, a vehicle inclination sensor(500) sensing an inclination of the vehicle, a BCM(300) outputting a signal for controlling a RPM of an engine at a proper level and simultaneously outputting a signal for changing a viscosity of an ER fluid(200) according to the sensed values of the vehicle speed sensor and vehicle inclination sensor, a brake pedal(100) rotating back and forth about a fixed shaft according to the viscosity of the ER fluid, and a booster(400) keeping and releasing braking force of a brake according to the rotation state of the brake pedal.
Patent KR-20060102313-A (KR)
Inventor: KIM YOU JUNG
IPC: A63F13/577
Filed: 2006-09-07
Abstract: 본 발명은 적어도 하나 이상의 경로(Path)와 상기 경로를 이동하는 적어도 하나 이상의 캐릭터(Character)와 적어도 두개 이상의 경로가 접하는 경로 상의 접점(Contact Point) 또는 적어도 두개 이상의 경로가 교차하는 경로 상의 교차점(Cross Point) 또는 상기 경로 상에 위치하여 상기 캐릭터의 정지 또는 통과 여부가 선택적으로 이루어지는 적어도 하나 이상의 정지점(Stop Point)을 포함하여 이루어지는 것을 특징으로 하는 경로 이동 게임 제어 방법에 있어서, 게임단말 또는 게임장치에 구비된 소정의 키입력수단을 통해 입력되는 상기 접점 또는 교차점 또는 정지점의 흐름제어 정보를 판독하는 단계; 상기 판독된 흐름제어 정보에 따라, 상기 접점 또는 정지점에서 상기 경로 상을 이동하는 적어도 하나 이상의 캐릭터의 정지 또는 통과를 제어하거나, 또는 상기 교차점에서 상기 경로 상을 이동하는 적어도 하나 이상의 캐릭터의 경로 이동 방향을 제어하는 단계; 및 상기 흐름제어 결과, 상기 적어도 하나 이상의 경로 중 적어도 하나 이상의 경로에서 정체가 발생하거나, 또는 상기 경로 상을 이동하는 적어도 하나 이상의 캐릭터의 이동이 불가한 경우, 상기 경로 이동 게임을 종료하는 단계;를 포함하여 이루어지는 것을 특징으로 하는 경로 이동 게임 제어 방법 및 시스템과 이를 위한 기록매체에 대한 것이다. 이에 의해, 게이머는 상기 게임에 구비된 경로 상의 접점 또는 교차점 또는 정지점에서 상기 캐릭터가 정체되지 않고 원활하게 이동하도록 흐름을 제어함으로써, 재미있게 집중력과 순발력은 물론 순간 판단력을 향상시킬 수 있는 이점이  있으며, 또한 상기 게임을 도로교통과 매칭하여 상기 게이머가 도로 상에서 교통의 흐름을 이해하고 안전하게 이동할 수 있도록 하는 이점이 있다. 
       
     경로,게임,이동
Patent KR-20080023564-A (KR)
Title: A storage receptacle cover for refrigerator
Inventor: MOON GI YONG
IPC: F25D25/00
Filed: 2006-09-11
Abstract: A storage box cover for a refrigerator is provided to separate a base plate from a cover frame easily for cleaning or exchange. A storage box cover for a refrigerator includes a cover frame(71) formed in a rectangular frame shape and having a receiving part(72) formed at the rim of an opening(71A) to be stepped downward and a separation groove formed in the inner rim surface to be connected to the receiving part at a side. A base plate(79) is placed on the receiving part, wherein the rim surface is in close contact with the inner rim surface of the cover frame in the proximity of the opening.
Patent KR-20080024594-A (KR)
Title: Drug delivery system for controlled release of angiogenesis-promoting protein drugs
Inventor: TAE GI YOONG
IPC: A61K9/22
Filed: 2006-09-14
Abstract: A drug delivery system for controlled release of angiogenesis-promoting protein drugs is provided to improve stability and controlled release properties of protein drugs to be delivered, and maximize topical delivery effects by reducing the initial burst of protein drugs, so that it is useful for treatment of disease associated with vascular closure or ischemic disease. A drug delivery system for controlled release of angiogenesis-promoting protein drugs comprises (a) the hydrogel complex containing (a-1) polysaccharide-functionalized nanoparticles containing (i) a core containing biodegradable polymer, (ii) a first hydrogel consisting of biocompatible polymer formed on the core and (iii) polysaccharide molecule non-covalently bound to the core and first hydrogel, and (a-2) a second hydrogel consisting of biocompatible polymer having cell-adhering activity as a carrier containing the nanoparticles, and (b) VEGF(vascular endothelial cell growth factor), FGF(fibroblast growth factor), PDGF(platelet-derived growth factor) or its combination which is non-covalently bound to the polysaccharide molecule.
Patent KR-20070031251-A (KR)
IPC: H04B1/40
Filed: 2006-09-14
Abstract: 다양한 출력 형태를 제어하는 출력 제어부와; 상기 출력제어부에 랜덤출력신호를 제공하는 랜덤출력신호 생성부(randomizer)와; 상기 출력제어부에 전기적으로 연결된 무선 송수신부(RF receiving unit)와; 상기 출력제어부의 제어신호에 따라 사용자가 인식할 수 있는 형태로 데이터를 출력하는 표시부를 포함하여 이루어지는 감정 표시 기능을 갖는 통신 장치. 
       
     감정, 무작위, 지능, 통신장치
Patent KR-20070037316-A (KR)
Inventor: NISHI EIJI
IPC: F16H59/60
Filed: 2006-09-19
Abstract: 본 발명의 과제는 작업 조건에 따라 다른 엔진 부하에 대해 적합한 부하 제어를 행할 수 있게 하는 것이다. 
     제어 수단(31)이 설정 회전수 검출 수단(52)의 검출과 회전수 검출 수단(47)의 검출을 기초로 하여 엔진 회전수의 설정 회전수로부터의 저하량을 산출하고, 그 산출한 저하량과, 미리 구비한 엔진 회전수와 무단 변속 장치(10)의 변속 조작 위치의 상관 관계 데이터를 기초로 하여 무단 변속 장치(10)의 한계 조작 위치를 설정하고, 그 설정한 한계 조작 위치와 변속 위치 검출 수단(30)의 검출을 기초로 하여 무단 변속 장치(10)의 변속 조작 위치가 한계 조작 위치에 위치하도록, 조작 수단(26)의 작동을 제어하도록 구성하고, 제어 수단(31)에 상관 관계 데이터의 변경을 지령하는 지령 수단(52)을 마련하고 있다. 
       
     제어 수단, 설정 회전수 검출 수단, 무단 변속 장치, 변속 위치 검출 수단, 조작 수단
Patent KR-20070035968-A (KR)
Inventor: YAMAMOTO HIDEKAZU
IPC: H01M10/0569
Filed: 2006-09-22
Abstract: 실리콘을 음극 활물질로서 이용하고，플루오로에틸렌카보네이트를 비수 전해질 중에 함유하는 비수 전해질 2차 전지에 있어，충전 보존시에 있어서 가스 발생을 억제할 수 있으며，또한 충방전 사이클 특성을 향상시킬 수 있는 비수 전해질 2차 전지를 수득한다． 
     실리콘을 음극 활물질로서 포함하는 음극과, 양극과, 전해질염 및 용매를 포함하는 비수 전해질을 구비하는 비수 전해질 2차 전지에 있어서，비수 전해질이 플루오로에틸렌카보네이트를 함유함과 동시에，ＬｉＢＦ 4 와，충방전 사이클에 의하여 발생하는 소비가 ＬｉＢＦ 4  보다 상대적으로 적은 전해질염이 전해질염으로서 함유되어 있는 것을 특징으로 한다． 
     비수 전해질 2차 전지, 플루오로에틸렌카보네이트, 실리콘, 전해질염
Patent KR-20080036761-A (KR)
Title: Plasma display panel
Inventor: HONG CHONG GI
IPC: H01J11/44
Filed: 2006-10-24
Abstract: A plasma display panel is provided to reduce manufacturing cost by preventing the reflection of external lights without an anti-reflection layer for preventing the reflection of the external lights. A plasma display panel includes rear and front substrates(10,20), barrier ribs(16), a phosphor layer(19), address and display electrodes(12,27), and a filter(30). The front substrate is coated by a first color. The rear substrate is formed opposite to the front substrate. The barrier ribs define plural discharge cells(18) by disposing between the front and rear substrates. The phosphor layer is coated in the discharge cells. The address and display electrodes are crossed between the rear and front substrates, and formed corresponding to the respective discharge cells. The filter, which is coated by a second color to be mixed with the first color, is attached to the front substrate.
Patent KR-20080036807-A (KR)
Title: Image processing apparatus and image processing method
Inventor: JEONG SA BONG
IPC: G06F3/12
Filed: 2006-10-24
Abstract: An image processing device and a method thereof are provided to enable a user to recognize characters even if the size of the printed character is small, and enable the user to adjust printed character images finely by enabling the user to select a process for trapping the character image. An image processor(120) processes printing data into image data to be printed. A controller(130) enables the image processor to emphasize an edge of character images when the size of the character in the printing data is bigger than a predetermined font size. A font checker(110) checks a font type/size of the character included in the printing data. The controller enables the image processor to emphasize the edge of the character image when the size of the checked character is bigger than the predetermined minimum font size corresponding to the font type of the checked character.
Patent KR-20070078777-A (KR)
Title: Investment casting mold design and method for investment casting using the same
Inventor: BULLIED STEVEN J
IPC: B22C9/04
Filed: 2006-10-30
Abstract: A design of an investment casting mold and an investment casting method using the same are provided to reduce the amount of dust entering a mold assembly and to prevent deformation of parts by easily removing wax materials and used shell and core materials without excessively smoothing the shell or the molded part. An investment casting method comprises the steps of: setting the position of a base plate(12) for a die; molding first materials between at least a first surface part of the base plate and the die; fixing at least one pattern including second materials, to the base plate; applying at least one coating layer on at least a portion of at least one pattern and at least a part of the first material; removing the first material through an inner receptacle of a manifold body(16) to leave at least one shell formed by the coating layer and practically removing the second material through an outer receptacle of the manifold body; removing the base plate; injecting the melted metal into at least one shell through the inner receptacle of the manifold body; solidifying the melted metal; and breaking and removing at least one investment casting mold.
Patent KR-20070115563-A (KR)
Title: Cmos imager system with interleaved readout for providing an image with increased dynamic range
Inventor: MANN RICHARD A
IPC: H04N5/335
Filed: 2006-10-31
Abstract: CMOS imager system with interleaved readout for providing an image with increased dynamic range and a method thereof are provided to have an image sensor which performs interleaved readout for providing the viewable image. An image sensor(102) includes a plurality of pixel sets. The image sensor(102) is performed as an interleaved mode or a non-interleaved mode. Each of a plurality of the pixel sets receives one of a plurality of exposure and generates image data corresponding to the one of a plurality of the exposure in the interleaved mode. The image sensor(102) outputs the image data generated by a plurality of the pixel sets as a frame of interleaved image data in the interleaved mode.
Patent KR-20080039585-A (KR)
Title: Led lighting panel for indoor advertisement
Inventor: YANG KYUNG HO
IPC: G09F13/22
Filed: 2006-11-01
Abstract: An LED lighting panel for an indoor advertisement is provided to display various characters, pictures, and numbers clearly and brightly by separating color beams from respective LEDs. An LED(Light Emitting Diode) lighting panel for an indoor advertisement includes plural LEDs which are arranged in rows and columns on a PCB. The LEDs are sequentially turned on according to a programmed sequence to display various characters, numbers, and pictures. A light interference preventing unit(4) is arranged to be apart from the LEDs on the PCB(Printed Circuit Board). Plural light passing holes are formed on the light interference preventing unit, so that the beams from the LEDs are not overlapped with one another. An advertisement display unit(5) is illuminated by the light passing through the light passing holes to display various characters, numbers, and pictures.
Patent KR-20070047720-A (KR)
Inventor: YEO GEON MIN
IPC: H04B7/26
Filed: 2006-11-02
Abstract: 본 발명은 이동통신 시스템의 패킷 스케줄링 방법 그리고 그 장치에 관한 것이다.  
     본 발명은 다수의 단말들이 공유하고 있는 단말과 기지국 사이의 전송 채널과 물리 채널을 각각 다수의 채널로 분류하고 각 채널별로 전송되는 정보를 특정화한다. 기지국은 전송 채널이나 물리 채널 중 어느 한 채널을 통하여 단말로부터 스케줄링 정보를 수신하고, 수신된 스케줄링 정보를 토대로 상기 단말에 대하여 상향 링크 트래픽 전송을 위한 상향 자원을 할당한다. 그리고 할당된 상향 자원에 대한 정보를 물리 채널의 UL-GCH(uplink grant channel)을 통하여 단말로 전송한다.  
     따라서, 자원을 할당하고 정보 및 신호들을 전송하는 채널들이 효율적으로 분류되어, 상기 채널들을 통한 효율적인 스케줄링이 이루어진다. 또한 분류된 채널들을 통하여 다수의 단말들이 효율적으로 스케줄링 정보를 제공함으로써, 단말들이 전송하는 정보간의 충돌을 방지할 수 있다.  
       
     패킷 스케줄링, 스케줄러, 채널 분류, UL-SCH, 물리채널
Patent KR-20080041516-A (KR)
Title: Image forming apparatus
Inventor: PAKR JU HYUN
IPC: B41J2/32
Filed: 2006-11-07
Abstract: An image forming apparatus is provided to enhance image quality by properly controlling a pressure between a thermal head and a platen roller when the quality of images is deteriorated due to the change of the pressure. An image forming apparatus includes a frame(10), a platen roller(20), a thermal head(30), a head supporting member(40), and a control shaft(50). The frame consists of first and second frames facing each other. The platen roller is rotatably supported by the first and second frames. The thermal head is arranged above the platen roller and forms images on a print medium being pressed onto the platen roller. The head supporting member supports the thermal head and presses the thermal head onto the platen roller. The control shaft is connected with the first frame and controls a pressure between the thermal head and the platen roller.
Patent KR-20070080202-A (KR)
Title: Image display device and image display method
Inventor: BABA MASAHIRO
IPC: G09G3/36
Filed: 2006-11-16
Abstract: An image display device and an image display method are provided to improve quality of an input image by changing a black screen display time according to the motion amount in the input image. An image display device includes an image display unit(26), a target value calculator(16), a variation calculator(18), an output value calculator(20), and a controller(22). The target value calculator calculates a target value of black screen display time in one frame period of an input image. The variation calculator calculates a change amount of an output value of the black screen display time for a unit period based on a difference between the target value and an output value from the previous frame and a difference between the previous and current target values. The output value calculator accumulates the variation values of the previous frame and outputs the output value of the black screen display time for the current frame. The controller divides one frame period into two sections. The first section corresponds to the output value of the current frame. The second section corresponds to the rest period except for the first section. During the first section, the image display unit displays a black screen. During the second section, the image display unit displays the image based on the input image.