KR20070091919A - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
KR20070091919A
KR20070091919A KR1020060021694A KR20060021694A KR20070091919A KR 20070091919 A KR20070091919 A KR 20070091919A KR 1020060021694 A KR1020060021694 A KR 1020060021694A KR 20060021694 A KR20060021694 A KR 20060021694A KR 20070091919 A KR20070091919 A KR 20070091919A
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South Korea
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liquid crystal
crystal display
circuit
voltage
backlight unit
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KR1020060021694A
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Korean (ko)
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KR101272176B1 (en
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유재성
이부열
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엘지.필립스 엘시디 주식회사
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Priority to KR1020060021694A priority Critical patent/KR101272176B1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers

Abstract

An LCD(Liquid Crystal Display) device is provided to drive circuit components of the SOP(System On Panel) type LCD device by using a power source and reduce the number of used power chips, thereby reducing manufacturing costs. An LCD(Liquid Crystal Display) device comprises the followings: an LCD panel(200) in which a driving circuit(210) having a voltage down and boost circuit(212) is installed; a backlight unit(230) for supplying light to the LCD panel; and a voltage source(240) for supplying first voltage to the backlight unit and the driving circuit. The voltage down and boost circuit are configured by using a resistor. The backlight unit is composed of an inverter and a lamp and the voltage source is implemented as one semiconductor integrated circuit.

Description

액정표시장치{Liquid crystal display}Liquid crystal display

도 1은 종래의 SOP 방식 액정표시장치의 구성을 도시한 블록구성도1 is a block diagram showing the configuration of a conventional SOP type liquid crystal display device

도 2는 본 발명에 따른 액정표시장치의 구성을 도시한 블록구성도2 is a block diagram showing the configuration of a liquid crystal display according to the present invention.

도 3은 본 발명에 따른 액정표시장치의 구성 중 강압 및 승압회로에 대한 일예를 도시한 회로도3 is a circuit diagram showing an example of the step-down and step-up circuit of the configuration of the liquid crystal display device according to the present invention;

<도면의 주요부분에 대한 간단한 설명><Brief description of the main parts of the drawing>

200 : 액정표시패널 210 : 패널구동회로부200: liquid crystal display panel 210: panel driving circuit unit

212 : 강압 및 승압회로 220 : PCB212 step-down and step-up circuit 220: PCB

230 : 백라이트유닛 240 : 전원칩230: backlight unit 240: power chip

본 발명은 액정표시장치에 관한 것으로서, 보다 상세하게는 하나의 전원공급칩을 이용하여 표시패널 구동회로와 백라이트 유닛을 구동할 수 있도록 하는 액정 표시장치에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device that can drive a display panel driving circuit and a backlight unit using one power supply chip.

액정표시장치는 소형 및 박형화와 저전력 소모의 장점을 가지며, 노트북 컴퓨터, 사무자동화 기기, 오디오/비디오 기기 등으로 이용되고 있다. 특히, 스위치 소자로서 박막 트랜지스터(Thin Film Transistor : 이하 "TFT"라 함)가 이용되는 액티브 매트릭스 타입의 액정표시장치는 동적인 이미지를 표시하기에 적합하다.LCDs have advantages of small size, thinness, and low power consumption, and are being used as notebook computers, office automation devices, and audio / video devices. In particular, an active matrix liquid crystal display device using a thin film transistor (hereinafter referred to as "TFT") as a switch element is suitable for displaying a dynamic image.

이러한 액정표시장치는 근래 대형화 및 박형화의 추세에 따라 대형모델의 액정표시장치의 경우 표시패널의 일부 영역에 구동회로 전체 또는 일부를 내장한 SOP(system on panel) 방식이 주를 이루고 있다.  In recent years, the liquid crystal display (LCD) has become a large-sized and thinner LCD, and the SOP (system on panel) system in which the driving circuit is integrated in a part of the display panel is mainly used in large LCD models.

통상 SOP 방식은 액정표시패널에 소스구동부와 스캔구동부 및 타이밍구동부 등을 실장하고 그 외 패널용 전원칩, 백라이트용 전원칩, 프레임 메모리 소자 등은 별도의 인쇄회로기판(PCB)에 구성하며, 표시패널에 실장되는 회로는 표시패널의 크기 및 설계자의 응용에 따라 다양하게 선택가능하다.In general, the SOP method includes a source driver, a scan driver, a timing driver, and the like in a liquid crystal display panel. The panel power chip, backlight power chip, and frame memory device are configured on a separate printed circuit board (PCB). The circuit mounted on the panel can be variously selected according to the size of the display panel and the application of the designer.

도 1은 종래의 SOP 방식 액정표시장치의 구성을 도시한 블록구성도로서, 액정표시패널(100)과 백라이트유닛(130) 및 PCB(120)로 구분된다.FIG. 1 is a block diagram showing the structure of a conventional SOP type liquid crystal display device, and is divided into a liquid crystal display panel 100, a backlight unit 130, and a PCB 120.

액정표시패널(100)은 SOP 방식으로 제작되어 패널구동회로부(110)가 표시패널 내에 실장된다. 상기 패널구동회로부(110)는 상기 액정표시패널(100)로 영상 데이터를 출력하는 소스구동부 및 상기 영상데이터가 상기 액정표시패널(100)로 입력되도록 하는 스캔신호를 출력하는 스캔구동부를 포함한다. The liquid crystal display panel 100 is manufactured in the SOP method so that the panel driving circuit unit 110 is mounted in the display panel. The panel driver circuit 110 includes a source driver for outputting image data to the liquid crystal display panel 100 and a scan driver for outputting scan signals for inputting the image data to the liquid crystal display panel 100.

PCB(120)는 인쇄회로기판(printed circuit board)으로서, 상기 구동회로부(110)에 포함되지 않은 기타 회로부, 예를 들어 메모리소자, 타이밍제어부(Timing controller), 전원칩 등을 실장하고 있다. The PCB 120 is a printed circuit board, and includes other circuit parts not included in the driving circuit part 110, for example, a memory device, a timing controller, a power chip, and the like.

제1전원칩(122)은 상기 패널구동회로부(110)에 포함된 각 구동부의 동작에 필요한 전압(V2)을 생성하여 출력하는데, 예를 들어 소스구동부에서 요구되는 감마기준전압의 생성을 위한 DC 12V 등이 상기 (V2)에 포함된다. The first power chip 122 generates and outputs a voltage V2 necessary for the operation of each driver included in the panel driver circuit unit 110. For example, a DC for generating a gamma reference voltage required by the source driver is generated. 12V and the like are included in the above (V2).

백라이트유닛(130)은 상기 액정표시패널(100)측으로 빛(light)을 공급하는 구성으로서 인버터(inverter) 및 냉음극형광램프(CCFL)과 같은 램프(lamp)를 포함하여 구성되며, 제2전원칩(140)으로부터 상기 인버터와 램프의 동작에 필요한 전압(V3)을 공급받는데, 예를 들어 상기 인버터의 동작을 위한 DC 12V 등이 상기 (V3)에 포함된다. The backlight unit 130 is configured to supply light to the liquid crystal display panel 100 and includes a lamp such as an inverter and a cold cathode fluorescent lamp (CCFL). The chip 140 receives a voltage V3 necessary for the operation of the inverter and the lamp. For example, DC 12V for the operation of the inverter is included in the V3.

여기서 상기 제1 및 제2전원칩(122, 140)은 DC-DC컨버터(DC to DC converter)이고, 또한 도면에 표시된 (V1)전압은 상기 패널구동회로부(110)에 집적회로(IC)의 형태로 구성된 소스 및 스캔구동부 IC를 동작시키는 전원전압으로서 외부회로(미도시됨)로부터 전송된 약 DC 3.3V 정도의 전압이다. Here, the first and second power chips 122 and 140 are DC-DC converters, and the voltage (V1) shown in the drawing is connected to the panel driving circuit unit 110 of the integrated circuit (IC). As a power supply voltage for operating the source and scan driver ICs configured in this form, they are voltages of about DC 3.3V transmitted from an external circuit (not shown).

그런데, 상기와 같이 패널구동회로부(110)와 백라이트유닛(130)으로 공급될 전원을 생성하는 전원칩을 각각 별도로 구성할 경우, 상기 PCB(120)의 회로설계상 요구되는 면적이 증대됨은 물론이고 고가의 전원칩을 다수개 사용함에 따른 제조비용 상승의 단점이 있다. However, when separately configuring a power chip for generating power to be supplied to the panel driving circuit unit 110 and the backlight unit 130 as described above, the area required for the circuit design of the PCB 120 is of course increased. There is a drawback of increasing manufacturing costs due to the use of multiple expensive power chips.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로서, SOP 방식 액정표시장치의 회로구성부들을 단일전원소스를 이용하여 구동할 수 있도록 하는데 목적이 있다. 또한 전원칩의 사용개수를 줄임으로써 제조비용을 절감할 수 있는 액정표시장치를 제공하는데 또다른 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to enable circuit components of an SOP type liquid crystal display device to be driven using a single power source. In addition, another object of the present invention is to provide a liquid crystal display device which can reduce manufacturing cost by reducing the number of power chips.

상기와 같은 목적을 달성하기 위해 본 발명은, 강압 및 승압회로를 구비한 구동회로가 실장된 액정표시패널과; 상기 액정표시패널로 빛을 공급하기 위한 백라이트유닛과; 상기 백라이트유닛과 상기 구동회로로 제1전압을 공급하는 전압원을 포함하는 액정표시장치를 제공한다. In order to achieve the above object, the present invention includes a liquid crystal display panel mounted with a driving circuit having a step-down and step-up circuit; A backlight unit for supplying light to the liquid crystal display panel; A liquid crystal display device includes a voltage source for supplying a first voltage to the backlight unit and the driving circuit.

상기 강압 및 승압회로는 저항을 이용해 구성되는 회로인 것을 특징으로 한다.The step-down and step-up circuit is characterized in that the circuit is configured using a resistor.

상기 백라이트유닛은 인버터와 램프로 구성되는 것을 특징으로 한다.The backlight unit is characterized by consisting of an inverter and a lamp.

상기 전압원은 하나의 반도체 집적회로 형태로 구성되는 것을 특징으로 한다.The voltage source may be configured in the form of one semiconductor integrated circuit.

상기 제1전압은 DC 12V인 것을 특징으로 한다.The first voltage is characterized in that the DC 12V.

상기 구동회로는 상기 액정표시패널로 영상데이터를 출력하는 소스구동부와, 상기 소스구동부로부터 출력된 영상데이터가 상기 액정표시패널에 입력되도록 하는 스캔신호를 출력하는 스캔구동부를 더욱 포함한다.The driving circuit further includes a source driver for outputting image data to the liquid crystal display panel, and a scan driver for outputting a scan signal for inputting image data output from the source driver to the liquid crystal display panel.

상기 액정표시장치는 메모리소자와 타이밍제어회로를 구비한 인쇄회로기판을 더욱 포함한다.The liquid crystal display further includes a printed circuit board having a memory element and a timing control circuit.

이하 첨부된 도면을 참조하여 본 발명에 따른 액정표시장치에 대해 설명한다.Hereinafter, a liquid crystal display according to the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 액정표시장치의 구성을 도시한 블록구성도로서, 패널구동회로부(210)가 실장된 액정표시패널(200)과, 백라이트유닛(230), 하나의 전원칩(240)으로 구성되며, 더욱 바람직하게는 PCB(220)를 더욱 포함하여 구성된다.2 is a block diagram showing the configuration of a liquid crystal display according to the present invention. The liquid crystal display panel 200 in which the panel driving circuit unit 210 is mounted, the backlight unit 230, and one power chip 240 are shown. It is configured as, more preferably comprises a PCB 220 further.

상기 액정표시패널(200)은 다수개의 액정화소로 구성되며 또한 일부 공간에 패널구동회로부(210)가 구성되어 있다.The liquid crystal display panel 200 includes a plurality of liquid crystal pixels, and a panel driving circuit 210 is formed in a part of space.

상기 패널구동회로부(210)는 상기 액정표시패널(200)로 영상 데이터를 출력하는 소스구동부 및 상기 영상데이터가 상기 액정표시패널(200)로 입력되도록 하는 스캔신호를 출력하는 스캔구동부를 포함하며, 또한 전압 레벨을 강압 및 승압시키기 위한 강압 및 승압회로(212)를 구비한다. The panel driver circuit 210 includes a source driver for outputting image data to the liquid crystal display panel 200 and a scan driver for outputting a scan signal for inputting the image data to the liquid crystal display panel 200. A step-down and step-up circuit 212 is also provided for stepping down and stepping up voltage levels.

상기 강압 및 승압회로(212)는 입력전압(즉, V3)을 이용하여 다양한 레벨의 전압을 생성할 수 있는 회로이면 가능하고, 바람직하게는 도 3에 도시된 바와 같이, 다수개의 저항(R1~R6)으로 회로를 구성하여 입력전압(V3)을 상기 패널구동회로부(210)에서 요구하는 여러 전압레벨(Va, Vb, Vc)로 생성하여 제공한다. The step-down and step-up circuit 212 may be a circuit capable of generating various levels of voltage using an input voltage (ie, V3). Preferably, as shown in FIG. The circuit is configured by R6) to generate and provide an input voltage V3 at various voltage levels Va, Vb, and Vc required by the panel driver circuit 210.

상기 PCB(220)는 인쇄회로기판(printed circuit board)으로서, 상기 패널구동회로부(210)에 포함되지 않은 기타 회로부, 예를 들어 메모리소자, 타이밍제어부(Timing controller) 등을 실장하고 있으며, 외부회로부(미도시됨)로부터 상기 패널구동회로부(210)에 집적회로(IC)의 형태로 구성된 소스 및 스캔구동부 IC를 동작시키는 전압(V1)을 입력받아 상기 패널구동회로부(210)로 전송한다. 이때 상기 전 송되는 (V1)전압은 약 DC 3.3V 이다. The PCB 220 is a printed circuit board, and includes other circuit units not included in the panel driving circuit unit 210, for example, a memory device, a timing controller, and an external circuit unit. An input of a voltage V1 for operating a source and a scan driver IC configured in the form of an integrated circuit IC is input to the panel driver circuit unit 210 from the panel driver circuit unit 210 (not shown). At this time, the transmitted (V1) voltage is about DC 3.3V.

상기 백라이트유닛(230)은 상기 액정표시패널(200)측으로 빛(light)을 공급하는 구성으로서 인버터(inverter) 및 냉음극형광램프(CCFL)와 같은 램프(lamp)를 포함하여 구성되며, 후술될 전원칩(240)으로부터 상기 인버터와 램프의 동작에 필요한 전압(V3)을 공급받는데, 예를 들어 상기 인버터의 동작을 위한 DC 12V 등이 상기 (V3)에 포함된다.The backlight unit 230 is configured to supply light to the liquid crystal display panel 200 and includes a lamp such as an inverter and a cold cathode fluorescent lamp (CCFL), which will be described later. The voltage V3 required for the operation of the inverter and the lamp is supplied from the power chip 240. For example, DC 12V for the operation of the inverter is included in the V3.

상기 전원칩(240)은 상기 백라이트유닛(230)과 상기 패널구동회로부(210)로 전압(V3)을 공급하는 DC-DC 컨버터로서, 출력전압은 액정표시장치의 종류에 따라 다르나 약 DC 12V 정도의 전압을 출력한다.The power chip 240 is a DC-DC converter for supplying a voltage V3 to the backlight unit 230 and the panel driver circuit 210. The output voltage varies depending on the type of liquid crystal display device, but is about DC 12V. Output the voltage of.

상기와 같이 구성된 본 발명에 따른 액정표시장치는, 하나의 전원칩(240)으로부터 출력된 (V3)전압을 상기 백라이트유닛(230)과 상기 패널구동회로부(210)의 강압 및 승압회로(212)로 각각 공급하며, 이에 상기 강압 및 승압회로(212)는 입력된 (V3)전압을 도 3에 예시한 바와 같은 강압 및 승압회로(212)를 이용하여 상기 패널구동회로부(210)의 여러 구성부가 요구하는 전압레벨로 변환하여 공급함으로써 고가의 전원칩 개수를 절감할 수 있다.In the liquid crystal display according to the present invention configured as described above, the voltage step-up and step-up circuits 212 of the backlight unit 230 and the panel driver circuit 210 are converted to the voltage (V3) output from one power chip 240. Each of the step-down and step-up circuits 212 uses the step-down and step-up circuits 212 as illustrated in FIG. By converting and supplying the required voltage level, the number of expensive power chips can be reduced.

상기 설명한 바와 같이 본 발명에 따른 액정표시장치는, SOP 방식의 액정표시패널에 실장된 구동회로의 구동에 요구되는 다양한 레벨의 전압과 백라이트유닛의 구동을 위한 전압을 하나의 전원칩을 통해 제공할 수 있어 소요되는 전원칩의 개수를 줄일 수 있어 제조비용이 절감되는 효과가 있다.As described above, the liquid crystal display device according to the present invention provides various voltages required for driving the driving circuit mounted on the SOP type liquid crystal display panel and voltages for driving the backlight unit through one power chip. Since the number of power chips required can be reduced, manufacturing cost can be reduced.

Claims (7)

강압 및 승압회로를 구비한 구동회로가 실장된 액정표시패널과;A liquid crystal display panel on which a driving circuit including a step-down and a step-up circuit is mounted; 상기 액정표시패널로 빛을 공급하기 위한 백라이트유닛과;A backlight unit for supplying light to the liquid crystal display panel; 상기 백라이트유닛과 상기 구동회로로 제1전압을 공급하는 전압원A voltage source supplying a first voltage to the backlight unit and the driving circuit 을 포함하는 액정표시장치Liquid crystal display comprising a 청구항 제 1 항에 있어서,The method according to claim 1, 상기 강압 및 승압회로는 저항을 이용해 구성되는 회로인 것을 특징으로 하는 액정표시장치The step-down and step-up circuit is a liquid crystal display, characterized in that the circuit configured by using a resistor 청구항 제 1 항에 있어서,The method according to claim 1, 상기 백라이트유닛은 인버터와 램프로 구성되는 것을 특징으로 하는 액정표시장치The backlight unit is a liquid crystal display device comprising an inverter and a lamp 청구항 제 1 항에 있어서,The method according to claim 1, 상기 전압원은 하나의 반도체 집적회로 형태로 구성되는 것을 특징으로 하는 액정표시장치The voltage source is a liquid crystal display, characterized in that formed in the form of a semiconductor integrated circuit 청구항 제 1 항에 있어서,The method according to claim 1, 상기 제1전압은 DC 12V인 것을 특징으로 하는 액정표시장치Wherein the first voltage is DC 12V. 청구항 제 1 항에 있어서,The method according to claim 1, 상기 구동회로는 상기 액정표시패널로 영상데이터를 출력하는 소스구동부와, 상기 소스구동부로부터 출력된 영상데이터가 상기 액정표시패널에 입력되도록 하는 스캔신호를 출력하는 스캔구동부를 더욱 포함하는 액정표시장치The driving circuit further includes a source driver for outputting image data to the liquid crystal display panel, and a scan driver for outputting a scan signal for inputting image data output from the source driver to the liquid crystal display panel. 청구항 제 1 항에 있어서,The method according to claim 1, 메모리소자와 타이밍제어회로를 구비한 인쇄회로기판을 더욱 포함하는 액정표시장치Liquid crystal display further comprising a printed circuit board having a memory element and a timing control circuit
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101017297B1 (en) * 2008-07-07 2011-02-28 엘아이지넥스원 주식회사 Reduction circuit of output ripple and noise for dc-dc converter
KR20110084677A (en) * 2010-01-18 2011-07-26 삼성전자주식회사 Power source circuit and liquid crystal display having the same

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KR100810159B1 (en) * 2002-03-08 2008-03-06 비오이 하이디스 테크놀로지 주식회사 Circuit of generation power for driving in lcd
KR100486281B1 (en) * 2002-11-16 2005-04-29 삼성전자주식회사 Super Twist Nematic liquid crystal display driver for reducing power consumption
KR100559229B1 (en) * 2003-04-01 2006-03-15 비오이 하이디스 테크놀로지 주식회사 The Tuning Device for Control signals Of LCD
KR100965172B1 (en) * 2003-12-02 2010-06-24 삼성전자주식회사 Apparatus for driving lamp, and liquid crystal display having the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101017297B1 (en) * 2008-07-07 2011-02-28 엘아이지넥스원 주식회사 Reduction circuit of output ripple and noise for dc-dc converter
KR20110084677A (en) * 2010-01-18 2011-07-26 삼성전자주식회사 Power source circuit and liquid crystal display having the same
US8970575B2 (en) 2010-01-18 2015-03-03 Samsung Display Co., Ltd. Power source circuit and liquid crystal display apparatus having the same

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