KR20110058027A - Apparatus for switching power of liquid crystal display - Google Patents

Apparatus for switching power of liquid crystal display Download PDF

Info

Publication number
KR20110058027A
KR20110058027A KR1020090114683A KR20090114683A KR20110058027A KR 20110058027 A KR20110058027 A KR 20110058027A KR 1020090114683 A KR1020090114683 A KR 1020090114683A KR 20090114683 A KR20090114683 A KR 20090114683A KR 20110058027 A KR20110058027 A KR 20110058027A
Authority
KR
South Korea
Prior art keywords
pull
transfer unit
liquid crystal
crystal display
voltage
Prior art date
Application number
KR1020090114683A
Other languages
Korean (ko)
Inventor
장영준
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020090114683A priority Critical patent/KR20110058027A/en
Publication of KR20110058027A publication Critical patent/KR20110058027A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/01—Modifications for accelerating switching
    • H03K19/017—Modifications for accelerating switching in field-effect transistor circuits
    • H03K19/01728—Modifications for accelerating switching in field-effect transistor circuits in synchronous circuits, i.e. by using clock signals
    • H03K19/01742—Modifications for accelerating switching in field-effect transistor circuits in synchronous circuits, i.e. by using clock signals by means of a pull-up or down element
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE: An apparatus for switching power of a liquid crystal display is provided to prevent an overcurrent in malfunction by arranging a pull down voltage division unit in the input terminal of a pull down transfer unit. CONSTITUTION: In an apparatus for switching power of a liquid crystal display, a pull-up transfer unit(210) is activated by a pull-up control signal. The pull-up transfer unit transfers a direct current voltage to an output terminal. The pull down transfer unit(220) is activated by the pull-down control signal. The pull down transfer unit transfers a ground voltage to an output terminal. A pull down voltage division unit(230) suppress the increase of the input voltage of the pull down transfer unit.

Description

액정 디스플레이의 전원 공급용 스위칭 장치{Apparatus for Switching Power of Liquid Crystal Display}Switching device for power supply of liquid crystal display {Apparatus for Switching Power of Liquid Crystal Display}

실시예는 액정 디스플레이의 전원 공급용 구동 장치에 관한 것이다.An embodiment relates to a driving device for power supply of a liquid crystal display.

일반적으로, 액정 디스플레이는 전계 인가 전극이 구비된 두 표시 평판과 그사이에 배치되어 있는 유전율 이방성을 갖는 액정층을 구비한다. 전계 인가 전극에 전압을 인가하여 액정층에 전기장을 생성하고, 전압을 변화시켜 이 전기장의 세기를 조절함으로써 액정층을 통과하는 빛의 투과율을 조정하여 원하는 화상을 표시한다.In general, a liquid crystal display includes two display plates provided with electric field application electrodes and a liquid crystal layer having dielectric anisotropy disposed therebetween. A voltage is applied to the field applying electrode to generate an electric field in the liquid crystal layer, and the voltage is changed to adjust the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer to display a desired image.

이러한 액정 디스플레이는 자체 발광을 하지 못하므로, 백라이트라고 불리는 별도의 광원이 필요하며, 이러한 백라이트에는 발광 다이오드(Light Emitting Diode; LED), 냉음극 형광 램프(Cold Cathod Fluorescent Lamp; CCFL), 외부 전극 형광 램프(External Electrode Fluorescent Lamp; EEFL) 등이 이용되고 있다.Since the liquid crystal display does not emit light by itself, a separate light source called a backlight is required, and the backlight includes a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), and an external electrode fluorescent lamp. Lamps (External Electrode Fluorescent Lamps (EEFL)) are used.

상술한 액정 디스플레이의 백라이트에는 안정적인 전원 공급을 위하여 별도의 전원 공급 장치를 배치하고 있다.In the backlight of the liquid crystal display, a separate power supply device is disposed for stable power supply.

그런데, 종래에는 액정 디스플레이의 전원 공급 장치에 포함되어 있는 스위칭 장치에 오동작으로 인하여 과도한 전류가 흐르게 되어 파손되는 문제점이 있다.However, conventionally, excessive current flows due to a malfunction in a switching device included in a power supply of a liquid crystal display, which causes a problem of damage.

실시예에 따른 액정 디스플레이의 전원 공급용 스위칭 장치는 오동작이 발생하더라도 과도한 전류가 흐르는 것을 억제할 수 있다.The switching device for power supply of the liquid crystal display according to the embodiment can suppress the excessive current flowing even if malfunction occurs.

일 실시예에 따른 액정 디스플레이의 전원 공급용 스위칭 장치는 풀업 제어 신호에 의해서 활성화되어 출력단으로 직류 전압을 전달하는 풀업 전달부, 풀다운 제어 신호에 의해서 활성화되어 상기 출력단으로 접지 전압을 전달하는 풀다운 전달부 및 상기 풀다운 전달부의 입력단에 배치되어 상기 풀다원 전달부의 입력 전압이상승하는 것을 억제하는 풀다운 분압부를 포함한다.Switching device for power supply of the liquid crystal display according to an embodiment of the present invention is a pull-up transfer unit that is activated by a pull-up control signal to transfer a DC voltage to an output terminal, and a pull-down transfer unit that is activated by a pull-down control signal to transfer a ground voltage to the output terminal. And a pull-down voltage divider disposed at an input terminal of the pull-down transfer unit to suppress an increase in an input voltage of the pull-down transfer unit.

실시예들에 따른 액정 디스플레이의 전원 공급용 스위칭 장치는 풀다운 분압부를 풀다운 전달부의 입력단에 배치함으로써, 오동작이 발생하더라도 과도한 전류가 흐르는 것을 억제할 수 있는 효과가 있다.The switching device for power supply of the liquid crystal display according to the embodiments has an effect of suppressing excessive current flow even if a malfunction occurs by arranging a pull-down voltage divider at an input terminal of a pull-down transfer unit.

이하에서는 첨부된 도면을 참조로 하여 본 발명의 바람직한 실시예를 보다 상세히 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

도 1은 본 발명의 일 실시예에 따른 액정 디스플레이의 전원 공급용 스위칭 장치의 회로도이다.1 is a circuit diagram of a switching device for power supply of a liquid crystal display according to an embodiment of the present invention.

본 발명의 일 실시예에 따른 액정 디스플레이의 전원 공급용 스위칭 장치는 도 1에 도시된 것처럼, 풀업 전달부(210), 풀다운 전달부(220) 및 풀다운 분압부(230)를 포함하여 구성될 수 있다.Switching device for power supply of the liquid crystal display according to an embodiment of the present invention may be configured to include a pull-up transfer unit 210, pull-down transfer unit 220 and pull-down voltage divider 230, as shown in FIG. have.

여기에서, 풀업 전달부(210)는 제어부(100)로부터 전달되는 풀업 제어 신호(HOUT)에 의해서 활성화되어 출력단으로 직류 전압(Vcc)을 전달하며, 출력단으로 전달되는 직류 전압(Vcc)은 전압 변환부(300)로 전달되어 액정 디스플레이에 전원을 공급하게 된다.Here, the pull-up transfer unit 210 is activated by the pull-up control signal HOUT transmitted from the control unit 100 to transfer the DC voltage Vcc to the output terminal, and the DC voltage Vcc transferred to the output terminal is a voltage conversion. The power is transmitted to the unit 300 to supply power to the liquid crystal display.

이러한 풀업 전달부(210)는 피모스 트랜지스터(p MOS FET; p Metal Oxide Semiconductor Field Effect Transistor, Q1)로 구성함으로써, 손실없이 직류 전압(Vcc)을 출력단으로 전달할 수 있다.The pull-up transfer unit 210 may be configured as a P MOS transistor (p MOS FET) to transfer a DC voltage Vcc to the output terminal without loss.

또한, 풀다운 전달부(220)는 제어부(100)로부터 전달되는 풀다운 제어 신호(LOUT)에 의해서 활성화되어 출력단으로 접지 전압을 전달하며, 출력단으로 전달되는 접지 전압은 전압 변환부(300)로 전달되어 액정 디스플레이에 전원을 공급하게 된다.In addition, the pull-down transfer unit 220 is activated by the pull-down control signal (LOUT) transmitted from the control unit 100 to transfer the ground voltage to the output terminal, the ground voltage transferred to the output terminal is transmitted to the voltage converter 300 Power is supplied to the liquid crystal display.

이러한 풀다운 전달부(220)는 엔모스 트랜지스터(n MOS FET; n Metal Oxide Semiconductor Field Effect Transistor, Q2)로 구성함으로써, 손실없이 접지 전압을 출력단으로 전달할 수 있다.The pull-down transfer unit 220 may be configured of an n MOS FET (n MOS FET) to transfer the ground voltage to the output terminal without loss.

한편, 풀다운 분압부(230)는 풀다운 전달부(220)의 입력단에 배치되어 풀다 운 전달부(220)의 입력 전압이 상승하는 것을 억제한다.On the other hand, the pull-down voltage divider 230 is disposed at the input terminal of the pull-down transfer unit 220 to suppress the input voltage of the pull-down transfer unit 220 rises.

이러한 풀다운 분압부(230)는 저항(R)으로 구성될 수 있으며, 오동작으로 인하여 로우 신호의 풀업 제어 신호(HOUT)와 하이 신호의 풀다운 제어 신호(LOUT)가 인가되더라도 풀다운 전달부(220)의 입력 전압이 상승하는 것을 억제할 수 있으므로, 풀업 전달부(210)와 풀다운 전달부(220)를 통하여 과도한 전류가 흐르는 것을 방지할 수 있다.The pull-down voltage divider 230 may be constituted by a resistor R, and even when a pull-up control signal HOUT of a low signal and a pull-down control signal LOUT of a high signal are applied due to a malfunction, Since the input voltage can be suppressed from rising, excessive current can be prevented from flowing through the pull-up transfer unit 210 and the pull-down transfer unit 220.

이상, 본 발명을 본 발명의 원리를 예시하기 위한 바람직한 실시예와 관련하여 설명하고 도시하였지만, 본 발명은 그와 같이 도시되고 설명된 그대로의 구성 및 작용으로 한정되는 것이 아니다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

오히려, 첨부된 청구범위의 사상 및 범주를 일탈함이 없이 본 발명에 대한 다수의 변경 및 수정이 가능함을 당업자들은 잘 이해할 수 있을 것이다.Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

따라서, 그러한 모든 적절한 변경 및 수정과 균등물들도 본 발명의 범위에 속하는 것으로 간주되어야 할 것이다.Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

도 1은 본 발명의 일 실시예에 따른 액정 디스플레이의 전원 공급용 스위칭 장치의 회로도.1 is a circuit diagram of a switching device for power supply of a liquid crystal display according to an embodiment of the present invention.

<도면의 주요부분에 대한 부호 설명>Description of the Related Art [0002]

100: 제어부 210: 풀업 전달부100: control unit 210: pull-up delivery unit

220: 풀다운 전달부 230: 풀다운 분압부220: pull down part 230: pull down partial pressure part

300: 변압부300: transformer

Claims (4)

풀업 제어 신호에 의해서 활성화되어 출력단으로 직류 전압을 전달하는 풀업 전달부;A pull-up transfer unit activated by the pull-up control signal to transfer a DC voltage to an output terminal; 풀다운 제어 신호에 의해서 활성화되어 상기 출력단으로 접지 전압을 전달하는 풀다운 전달부; 및A pull-down transfer unit activated by a pull-down control signal to transfer a ground voltage to the output terminal; And 상기 풀다운 전달부의 입력단에 배치되어 상기 풀다원 전달부의 입력 전압이상승하는 것을 억제하는 풀다운 분압부를 포함하는 액정 디스플레이의 전원 공급용 스위칭 장치.And a pull-down voltage divider disposed at an input terminal of the pull-down transfer unit to suppress an increase in an input voltage of the pull-down transfer unit. 제1항에 있어서,The method of claim 1, 상기 풀업 전달부는 피모스 트랜지스터(p MOS FET; p Metal Oxide Semiconductor Field Effect Transistor)인 액정 디스플레이의 전원 공급용 스위칭 장치.The pull-up transfer unit is a PMOS transistor (p MOS FET; p Metal Oxide Semiconductor Field Effect Transistor) switching device for power supply of the liquid crystal display. 제1항에 있어서,The method of claim 1, 상기 풀다운 전달부는 엔모스 트랜지스터(n MOS FET; n Metal Oxide Semiconductor Field Effect Transistor)인 액정 디스플레이의 전원 공급용 스위칭 장치.The pull-down transfer unit is an n MOS FET (n MOS FET) switching device for power supply of the liquid crystal display. 제1항에 있어서,The method of claim 1, 상기 풀다운 분압부는 저항인 액정 디스플레이의 전원 공급용 스위칭 장치.And said pull-down voltage divider is a resistor.
KR1020090114683A 2009-11-25 2009-11-25 Apparatus for switching power of liquid crystal display KR20110058027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090114683A KR20110058027A (en) 2009-11-25 2009-11-25 Apparatus for switching power of liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090114683A KR20110058027A (en) 2009-11-25 2009-11-25 Apparatus for switching power of liquid crystal display

Publications (1)

Publication Number Publication Date
KR20110058027A true KR20110058027A (en) 2011-06-01

Family

ID=44393573

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090114683A KR20110058027A (en) 2009-11-25 2009-11-25 Apparatus for switching power of liquid crystal display

Country Status (1)

Country Link
KR (1) KR20110058027A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106548746A (en) * 2017-01-20 2017-03-29 京东方科技集团股份有限公司 Shift register cell, gate driver circuit and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106548746A (en) * 2017-01-20 2017-03-29 京东方科技集团股份有限公司 Shift register cell, gate driver circuit and display device

Similar Documents

Publication Publication Date Title
JP4914058B2 (en) Inverter circuit
KR20110058027A (en) Apparatus for switching power of liquid crystal display
KR101020728B1 (en) Apparatus for driving Light Emitting Diode
KR101007035B1 (en) Apparatus for supplying Power of Light Emitting Diode
KR101683875B1 (en) Apparatus for supplying Power of Light Emitting Diode
JP3115116U (en) Self-excited inverter circuit
KR20110133906A (en) Inverter protecting apparatus
KR100968925B1 (en) Apparatus for supplying Power of Light Emitting Diode
KR101020727B1 (en) Inverter circuit for back light of liquid crystal display and driving system for having thereof
KR101054901B1 (en) LED drive device
KR101047800B1 (en) Power Supply for Light Emitting Diode
KR20120079339A (en) Apparatus for controlling current of light emitting diode
KR20100121964A (en) Apparatus for supplying power of light emitting diode
KR20090073374A (en) Shout-down circuit
KR101117746B1 (en) Apparatus for controlling current of light emitting diode
KR20100062427A (en) Apparatus for supplying power of light emitting diode
KR20110040537A (en) Apparatus for driving light emitting diode
KR20110139014A (en) Inverter circuit
US20080297498A1 (en) Light-source driving device and its signal transforming circuit and pulse generating circuit
KR101033972B1 (en) Apparatus for supplying power of light emitting diode
KR20110051500A (en) Apparatus for supplying power of light emitting diode
TWI441124B (en) Backlight on-off control circuit
KR100858690B1 (en) Inverter
KR20110012305A (en) Inverter for backlight
KR20090010659A (en) Inverter circuit

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal