KR101127865B1 - LCD with current protection circuit - Google Patents

LCD with current protection circuit Download PDF

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KR101127865B1
KR101127865B1 KR1020050055655A KR20050055655A KR101127865B1 KR 101127865 B1 KR101127865 B1 KR 101127865B1 KR 1020050055655 A KR1020050055655 A KR 1020050055655A KR 20050055655 A KR20050055655 A KR 20050055655A KR 101127865 B1 KR101127865 B1 KR 101127865B1
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circuit
liquid crystal
overcurrent
crystal display
display device
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KR1020050055655A
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Korean (ko)
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KR20070000144A (en
KR20060136114A (en
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신정욱
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엘지디스플레이 주식회사
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    • 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
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

본 발명은 액정표시장치에 관한 것으로, 보다 상세하게는 액정표시장치 내부 회로를 과전류로부터 보호할 수 있도록 과전류진단 및 전원차단 기능을 포함한다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, includes an overcurrent diagnosis and a power cut function to protect an internal circuit of the liquid crystal display device from overcurrent.

이를 위해 본 발명은 동작회로의 과전류를 감지하기 위한 과전류감지회로부와, 상기 과전류감지회로부의 감지결과에 따른 제어신호를 출력하는 과전류제어명령부와, 상기 과전류제어명령부의 제어신호에 의해 상기 동작회로로의 전원 공급 및 차단을 수행하는 전원공급제어회로부를 구비한 과전류보호회로를 포함한 액정표시장치로 제시되며, 소형 및 박형의 액정표시장치 구성회로를 이상 과전류로부터 보호함으로써 회로소자의 보호 및 제품의 수명연장에 효과가 있음은 물론이고, 액정표시장치의 정상적인 구동을 지원하는 장점이 있다.To this end, the present invention provides an over-current sensing circuit unit for sensing an over-current of an operation circuit, an over-current control command unit for outputting a control signal according to a detection result of the over-current sensing circuit unit, and the control circuit by the control signal of the over-current control command unit. The present invention provides a liquid crystal display device including an overcurrent protection circuit having a power supply control circuit unit for supplying and shutting down a furnace, and protects circuit elements by protecting small and thin liquid crystal display device components from abnormal overcurrent. Not only is it effective in extending the life, it is also advantageous in supporting normal driving of the liquid crystal display.

Description

과전류보호회로를 구비한 액정표시장치{LCD with current protection circuit}Liquid crystal display device with overcurrent protection circuit {LCD with current protection circuit}

도 1은 일반적인 액정표시장치의 기본 구성을 도시한 블록구성도1 is a block diagram showing a basic configuration of a general liquid crystal display device

도 2는 도 1의 구성 중 액정패널의 구성을 간략히 도시한 도면FIG. 2 is a view schematically illustrating a configuration of a liquid crystal panel among the components of FIG. 1.

도 3은 본 발명에 따른 액정표시장치의 특징인 과전류보호회로에 대한 블록구성도3 is a block diagram of an overcurrent protection circuit which is a feature of a liquid crystal display according to the present invention.

도 4는 본 발명에 따른 과전류보호회로 중 과전류감지회로부에 대한 예시회로도4 is an exemplary circuit diagram of an overcurrent detecting circuit unit in an overcurrent protection circuit according to the present invention.

도 5는 본 발명에 따른 과전류보호회로 중 과전류제어명령부를 예시한 도면5 is a diagram illustrating an overcurrent control command unit in an overcurrent protection circuit according to the present invention.

도 6은 본 발명에 따른 과전류보호회로 중 전원공급제어회로부에 대한 예시회로도6 is an exemplary circuit diagram of a power supply control circuit unit of an overcurrent protection circuit according to the present invention.

도 7은 본 발명에 따른 과전류보호회로의 액정표시장치내 구성예시를 도시한 구성도7 is a configuration diagram showing an example of the configuration in the liquid crystal display device of the overcurrent protection circuit according to the present invention;

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

110 : 과전류보호회로 112 : 과전류감지회로부110: overcurrent protection circuit 112: overcurrent detection circuit

114 : 과전류제어명령부 116 : 전원공급제어회로부114: overcurrent control command unit 116: power supply control circuit unit

본 발명은 액정표시장치에 관한 것으로, 보다 상세하게는 액정표시장치 내부 회로를 과전류로부터 보호할 수 있도록 과전류진단 및 전원차단 기능을 포함한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, includes an overcurrent diagnosis and a power cut function to protect an internal circuit of the liquid crystal display device from overcurrent.

디스플레이 장치 중 특히 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.Among display devices, liquid crystal display devices have advantages of small size, thinness and low power consumption and are used in notebook computers, office automation devices, audio / video devices, and the like. In particular, an active matrix type liquid crystal display device using a thin film transistor (hereinafter referred to as "TFT") as a switching element is suitable for displaying dynamic images.

도 1은 일반적인 액정표시장치의 기본 구성을 도시한 블록구성도로서, 크게 액정패널(2)과 LCM구동회로부(26)로 구분된다.1 is a block diagram showing a basic configuration of a general liquid crystal display device, which is largely divided into a liquid crystal panel 2 and an LCM driving circuit portion 26. [

각 구성을 보면, 인터페이스(10)는 퍼스널 컴퓨터등과 같은 구동시스템으로부터 LCM구동회로부(26)로 입력되는 데이터(RGB Data) 및 제어신호(입력 클럭, 수평동기신호, 수직동기신호, 데이터 인에이블 신호 등)들을 입력받아 타이밍 컨트롤러(12)로 공급한다. 주로 구동 시스템으로부터 데이터 및 제어 신호전송을 위해서 LVDS(Low Voltage Differential Signal) 인터페이스와 TTL 인터페이스 등이 사용되고 있다. 또한, 이러한 인터페이스 기능을 모아서 타이밍컨트롤러(12)와 함께 단일 칩(Chip)으로 집적시켜 사용하기도 한다.In each configuration, the interface 10 includes data (RGB Data) and control signals (input clock, horizontal synchronizing signal, vertical synchronizing signal, data enable) input to the LCM driving circuit unit 26 from a driving system such as a personal computer. Signals) and the like are supplied to the timing controller 12. LVDS (Low Voltage Differential Signal) interface and TTL interface are mainly used for data and control signal transmission from the drive system. In addition, the interface function may be collected and used together with the timing controller 12 in a single chip.

액정패널(2)은 도 2와 같이, 글라스를 이용한 기판 상에 다수의 데이터라인(DL1~DLm)과 다수의 게이트라인(GL1~GLn)이 교차되어 다수의 화소영역을 형성하며, 각각의 화소영역에는 박막트랜지스터(TFT)와 액정(LC)이 구성되어 화면을 표시한다.As illustrated in FIG. 2, the liquid crystal panel 2 forms a plurality of pixel regions by crossing a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn on a glass substrate. In the region, a thin film transistor TFT and a liquid crystal LC are configured to display a screen.

타이밍 컨트롤러(12)는 인터페이스(10)를 통해 입력되는 제어신호를 이용하여 복수개의 드라이브 집적회로들로 구성된 데이터 드라이버(18)와 복수개의 게이트 드라이버 집적회로들로 구성된 게이트 드라이버(20)를 구동하기 위한 제어신호를 생성한다. 또한, 인터페이스(10)를 통해 입력되는 데이터들을 데이터 드라이버(18)로 전송한다.The timing controller 12 drives the data driver 18 composed of a plurality of drive integrated circuits and the gate driver 20 composed of a plurality of gate driver integrated circuits using a control signal input through the interface 10. Generate a control signal for In addition, the data input through the interface 10 is transmitted to the data driver 18.

기준전압생성부(16)는 데이터 드라이버(18)에서 사용되는 DAC(Digital To Analog Converter)의 기준전압들을 생성한다. 기준전압들은 패널의 투과율-전압특성을 기준으로 생산자에 의해서 설정된다.The reference voltage generator 16 generates reference voltages of a digital to analog converter (DAC) used in the data driver 18. The reference voltages are set by the manufacturer based on the transmittance-voltage characteristics of the panel.

데이터 드라이버(18)는 타이밍 컨트롤러(12)로부터 입력되는 제어신호들에 응답하여 입력 데이터의 기준전압들을 선택하고, 선택된 기준전압을 액정패널(2)에 공급하여 액정 분자의 회전 각도를 제어한다.The data driver 18 selects reference voltages of the input data in response to control signals input from the timing controller 12, and supplies the selected reference voltage to the liquid crystal panel 2 to control the rotation angle of the liquid crystal molecules.

게이트 드라이버(20)는 타이밍 컨트롤러(12)로부터 입력되는 제어신호들에 응답하여 액정패널(2)상에 배열된 박막트랜지스터(TFT)들의 온/오프 제어를 수행하는데, 액정 패널(2) 상의 게이트 라인(GL1~GLn)을 1 수평동기 시간씩 순차적으로 인에이블 시킴으로써 액정 패널(2) 상의 박막 트랜지스터들(TFT)을 1 라인 분씩 순 차적으로 구동시켜 데이터드라이버(18)로부터 공급되는 아날로그 영상신호들이 각 박막트랜지스터(TFT)들에 접속된 픽셀들로 인가되도록 한다. The gate driver 20 performs on / off control of thin film transistors TFTs arranged on the liquid crystal panel 2 in response to control signals input from the timing controller 12. The gate driver 20 controls gates on the liquid crystal panel 2. By sequentially enabling the lines GL1 to GLn by one horizontal synchronizing time, the analog image signals supplied from the data driver 18 are sequentially driven by sequentially driving the thin film transistors TFT on the liquid crystal panel 2 by one line. Each pixel is applied to the pixels connected to the TFTs.

전원전압생성부(14)는 각 구성부들의 동작전원을 공급하고 액정패널(2)의 공통전극 전압을 생성하여 공급한다.The power supply voltage generating unit 14 supplies the operating power of each of the components and generates and supplies the common electrode voltage of the liquid crystal panel 2.

그런데, 상기한 구성으로 동작되어 화상을 표시하는 액정표시장치의 LCM구동회로부(26)에서는 생산 공정중의 오류 등 여러 원인으로 인해 과전류가 흐르는 경우가 발생된다.By the way, in the LCM driving circuit section 26 of the liquid crystal display device which is operated in the above-described configuration and displays an image, overcurrent flows due to various causes such as an error during the production process.

이러한 과전류는 상기 LCM구동회로부(26) 내의 부품에 손상을 미칠 수 있으며 이로 인해 화상의 표현이 원활하게 수행되지 못하는 원인이 된다. Such overcurrent may damage components in the LCM driving circuit unit 26, which may cause the image to not be smoothly performed.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로서, 구동회로부 내에 흐르는 과전류를 감지하고 이의 영향을 최소화하여 액정표시장치의 수명 연장과 더불어 부품의 손상을 방지하는데 목적이 있다. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to detect overcurrent flowing in the driving circuit unit and to minimize the effects thereof, thereby extending the life of the liquid crystal display device and preventing damage to components.

상기와 같은 목적을 달성하기 위해 본 발명은, 복수개의 화소를 구비한 액정패널과 상기 복수개의 화소에 영상데이터를 인가하여 화상을 표시하기 위한 LCM구동회로부를 구비한 액정표시장치에 있어서, In order to achieve the above object, the present invention provides a liquid crystal display device comprising a liquid crystal panel having a plurality of pixels and an LCM driving circuit unit for displaying an image by applying image data to the plurality of pixels.

동작회로의 과전류를 감지하기 위한 과전류감지회로부와, 상기 과전류감지회 로부의 감지결과에 따른 제어신호를 출력하는 과전류제어명령부와, 상기 제어신호에 의해 상기 동작회로로의 전원 공급 및 차단을 수행하는 전원공급제어회로부를 구비한 과전류보호회로를 포함하는 액정표시장치를 제시한다.An overcurrent sensing circuit unit for sensing an overcurrent of an operating circuit, an overcurrent control command unit for outputting a control signal according to a detection result of the overcurrent sensing circuit unit, and supplying and shutting off power to the operating circuit by the control signal A liquid crystal display device including an overcurrent protection circuit having a power supply control circuit unit is provided.

상기 액정표시장치에 있어서, 상기 과전류보호회로는 상기 LCM구동회로부에 구성되는 것을 특징으로 한다.In the liquid crystal display device, the overcurrent protection circuit is configured in the LCM driving circuit section.

상기 액정표시장치에 있어서, 상기 동작회로는 상기 액정패널 또는 상기 LCM구동회로부이거나, 또는 상기 액정패널 또는 상기 LCM구동회로부 내에 포함된 회로인 것을 특징으로 한다.In the liquid crystal display device, the operation circuit may be the liquid crystal panel or the LCM driving circuit unit or a circuit included in the liquid crystal panel or the LCM driving circuit unit.

상기 액정표시장치에 있어서, 상기 과전류제어명령부는 액정표시장치의 구동 타이밍을 제어하는 회로인 것을 특징으로 한다.In the liquid crystal display device, the overcurrent control command unit is a circuit for controlling the driving timing of the liquid crystal display device.

상기 액정표시장치에 있어서, 상기 과전류감지회로부는, In the liquid crystal display device, the overcurrent sensing circuit portion,

이 기준전원단과 접지전원단 사이에서 제1노드를 형성하며 직렬연결된 제1 및 제2저항과, 상기 제1노드와 연결되는 비반전입력단자와 상기 동작회로와 연결되는 반전입력단자를 구비한 연산증폭기와, 상기 반전입력단자와 상기 접지전원단 사이에 연결된 제3저항을 포함하여 구성되는 것을 특징으로 한다.A first node formed between the reference power supply terminal and the ground power supply terminal, the first and second resistors connected in series, a non-inverting input terminal connected to the first node, and an inverting input terminal connected to the operation circuit; And an amplifier, and a third resistor connected between the inverting input terminal and the ground power supply terminal.

상기 액정표시장치에 있어서, 전원공급제어회로부는, In the liquid crystal display device, the power supply control circuit unit,

상기 제어신호에 의해 턴온 여부가 결정되어 상기 동작회로로의 전원의 공급을 제어하는 트랜지스터를 포함하는 것을 특징으로 한다.And a transistor for determining whether to turn on by the control signal to control the supply of power to the operation circuit.

이하 첨부된 도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 액정표시장치의 특징인 과전류보호회로(110)에 대한 블록구성도이다.3 is a block diagram of an overcurrent protection circuit 110 which is a feature of a liquid crystal display according to the present invention.

과전류보호회로(110)는 액정표시장치 내 동작회로에 대한 보호를 목적으로 하는데 이상동작에 의한 과전류를 감지하고 이에 따른 보호동작을 수행하기 위해 구성된 것으로, 액정표시장치의 액정패널 또는 LCM구동회로부 중 필요에 따른 위치에 구성될 수 있다.The overcurrent protection circuit 110 is for protecting the operation circuit in the liquid crystal display device. The overcurrent protection circuit 110 is configured to detect an overcurrent caused by an abnormal operation and to perform the protection operation according to the overcurrent protection circuit. It may be configured in a position as required.

과전류감지회로부(112)는 액정표시장치 내에 구성된 동작회로(별도로 한정하지 않음)에 과전류가 흐르는 것을 감지하기 위한 회로부이며, 도 4에 도시된 예시회로와 같이, 기준전원(VDD)과 접지전원단(GND) 사이에 제1노드(N1)를 형성하며 직렬 연결된 제1저항(R1) 및 제2저항(R2)과, 상기 제1노드와 연결되는 비반전입력단자(+)와 상기 동작회로와 연결되는 반전입력단자(-)를 구비한 연산증폭기(OP-AMP)와, 상기 반전입력단자(-)와 상기 접지전원단(GND) 사이에 연결된 제3저항(R3)을 포함하여 구성된다. The overcurrent detecting circuit unit 112 is a circuit unit for detecting an overcurrent flowing through an operation circuit (not limited to) in the liquid crystal display, and as shown in the example circuit of FIG. 4, the reference power supply V DD and the ground power supply. A first node (N1) is formed between the terminals (GND), the first resistor (R1) and the second resistor (R2) connected in series, the non-inverting input terminal (+) connected to the first node and the operation circuit And an operational amplifier (OP-AMP) having an inverting input terminal (-) connected to and a third resistor (R3) connected between the inverting input terminal (-) and the ground power supply terminal (GND). .

상기 과전류감지회로부(112)의 동작을 보면, 상기 제3저항(R3)은 과전류 유입시 제2노드(N2)에 과전압(VOVER)을 생성하며, 상기 제3저항(R3)에 의해 생성된 과전압(VOVER)은 반전단자(-)로 입력되어 상기 비반전입력단자(+)로 입력되는 설정전압(VREF)과의 비교가 수행되며 상기 비교결과에 따라 과전류 유입여부를 판단하여 이에 따른 과전류 판단신호(VS)를 출력한다. 이때, 상기 과전류 판단신호(VS)는 하이(High) 또는 로우(low)와 같이 구분되는 전압레벨로 출력될 수 있다.Referring to the operation of the overcurrent sensing circuit 112, the third resistor R3 generates an overvoltage V OVER at the second node N2 when the overcurrent flows, and is generated by the third resistor R3. The overvoltage (V OVER ) is input to the inverting terminal (-) and the comparison with the set voltage (V REF ) input to the non-inverting input terminal (+) is performed. and it outputs an overcurrent determination signal (V S). In this case, the overcurrent determination signal (V S) may be output to a voltage level that is classified as high (High) or a low (low).

과전류제어명령부(114)는 상기 과전류감지회로부(112)의 과전류 판단신호(VS)에 따른 전원차단 제어명령(Voltage control signal:VCS))을 출력하는데, 도 5와 같이, 바람직하게는 액정표시장치 LCM구동회로부에 구성된 타이밍컨트롤러(Timing controller)이다. Over-current control command unit 114 is power-down control command according to an overcurrent determination signal (V S) of said overcurrent detection circuit (112) for printing (Voltage control signal VCS)), as shown in Figure 5, preferably, the liquid crystal A display controller is a timing controller configured in the LCM drive circuit section.

전원공급제어회로부(116)는 상기 과전류제어명령부(114)의 전원차단 제어명령(VCS)을 입력받아 상기 동작회로에 공급되는 전원(VC)을 차단하는 역할을 수행하며, 도 6과 같이, 동작회로 전원(VC)과 접지전원(GND) 사이에 구성되고 상기 전원차단 제어명령(VCS)이 게이트단자(G)로 입력되어 상기 전원차단 제어명령(VCS)에 의해 스위칭을 수행하는 트랜지스터(TR)를 이용하여 수행할 수 있다.The power supply control circuit unit 116 receives the power cutoff control command VCS of the overcurrent control command unit 114 and cuts off the power V C supplied to the operation circuit, as shown in FIG. 6. And a transistor configured between an operation circuit power supply (V C ) and a ground power supply (GND), and the power cutoff control command VCS is input to the gate terminal G to perform switching by the power cutoff control command VCS. (TR) can be used.

도 7은 액정패널(220)의 구동을 위해 데이터드라이버(230) 및 게이트드라이버(240)를 포함한 각각의 동작회로로 공급되는 동작전원(점선으로 표시)을 제어함으로써 과전류 발생시 액정패널(220)측 회로부의 손상을 방지할 수 있도록 LCM구동회로부(210) 내에 과전류보호회로(110)를 구성한 예시이다.FIG. 7 illustrates the operation of the liquid crystal panel 220 when an overcurrent occurs by controlling the operating power (indicated by a dotted line) supplied to each operation circuit including the data driver 230 and the gate driver 240 to drive the liquid crystal panel 220. The overcurrent protection circuit 110 is configured in the LCM driving circuit 210 to prevent damage to the circuit.

상기와 같이 설명한 본 발명에 따른 과전류보호회로를 구비한 액정표시장치는, 소형 및 박형의 액정표시장치 구성회로를 이상 과전류로부터 보호함으로써 회로소자의 보호 및 제품의 수명연장에 효과가 있음은 물론이고, 액정표시장치의 정상적인 구동을 지원하는 장점이 있다.The liquid crystal display device provided with the overcurrent protection circuit according to the present invention as described above is effective in protecting circuit elements and extending the life of the product by protecting the small and thin liquid crystal display device configuration circuits from abnormal overcurrent. Therefore, there is an advantage in supporting the normal driving of the liquid crystal display.

Claims (6)

복수개의 화소를 구비한 액정패널과 상기 복수개의 화소에 영상데이터를 인가하여 화상을 표시하기 위한 LCM구동회로부를 구비한 액정표시장치에 있어서,A liquid crystal display device comprising a liquid crystal panel having a plurality of pixels and an LCM driver circuit portion for displaying an image by applying image data to the plurality of pixels. 동작회로의 과전류를 감지하기 위한 과전류감지회로부와, 상기 과전류감지회로부의 감지결과에 따른 제어신호를 출력하는 과전류제어명령부와, 상기 제어신호에 의해 상기 동작회로로의 전원 공급 및 차단을 수행하는 전원공급제어회로부를 구비한 과전류보호회로를 포함하고,An overcurrent sensing circuit unit for sensing an overcurrent of an operating circuit, an overcurrent control command unit for outputting a control signal according to a detection result of the overcurrent sensing circuit unit, and supplying and shutting off power to the operating circuit by the control signal An overcurrent protection circuit having a power supply control circuit section, 상기 과전류감지회로부는, The overcurrent detection circuit unit, 기준전원단과 접지전원단 사이에서 제1노드를 형성하며 직렬연결된 제1 및 제2저항과, 상기 제1노드와 연결되는 비반전입력단자와 상기 동작회로와 연결되는 반전입력단자를 구비한 연산증폭기와, 상기 반전입력단자와 상기 접지전원단 사이에 연결된 제3저항을 포함하여 구성되는 것을 특징으로 하는An operational amplifier comprising a first node and a second resistor connected in series between a reference power supply terminal and a ground power supply terminal, a non-inverting input terminal connected to the first node, and an inverting input terminal connected to the operation circuit. And a third resistor connected between the inverting input terminal and the ground power supply terminal. 액정표시장치LCD Display 청구항 제 1 항에 있어서,The method according to claim 1, 상기 과전류보호회로는 상기 LCM구동회로부에 구성되는 것을 특징으로 하는 액정표시장치And the overcurrent protection circuit is configured in the LCM driving circuit section. 청구항 제 1 항에 있어서, The method according to claim 1, 상기 동작회로는 상기 액정패널 또는 상기 LCM구동회로부이거나, 또는 상기 액정패널 또는 상기 LCM구동회로부 내에 포함된 회로인 것을 특징으로 하는 액정표시장치Wherein the operation circuit is the liquid crystal panel or the LCM driver circuit part or a circuit included in the liquid crystal panel or the LCM driver circuit part. 청구항 제 1 항에 있어서,The method according to claim 1, 상기 과전류제어명령부는 액정표시장치의 구동 타이밍을 제어하는 회로인 것을 특징으로 하는 액정표시장치The overcurrent control command unit is a circuit for controlling the driving timing of the liquid crystal display device. 삭제delete 청구항 제 1 항에 있어서,The method according to claim 1, 전원공급제어회로부는, Power supply control circuit section, 상기 제어신호에 의해 턴온 여부가 결정되어 상기 동작회로로의 전원 공급을 제어하는 트랜지스터를 포함하는 것을 특징으로 하는 액정표시장치And a transistor for determining whether to turn on by the control signal to control power supply to the operation circuit.
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CN107578754B (en) * 2017-09-28 2020-04-07 深圳市华星光电技术有限公司 Overcurrent protection system and overcurrent protection method of liquid crystal display panel

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