KR20070067958A - Driving method of liquid crystal display - Google Patents

Driving method of liquid crystal display Download PDF

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KR20070067958A
KR20070067958A KR1020050129534A KR20050129534A KR20070067958A KR 20070067958 A KR20070067958 A KR 20070067958A KR 1020050129534 A KR1020050129534 A KR 1020050129534A KR 20050129534 A KR20050129534 A KR 20050129534A KR 20070067958 A KR20070067958 A KR 20070067958A
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South Korea
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lamps
liquid crystal
backlight unit
crystal display
light
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KR1020050129534A
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Korean (ko)
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나일구
정윤호
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삼성전자주식회사
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Priority to KR1020050129534A priority Critical patent/KR20070067958A/en
Publication of KR20070067958A publication Critical patent/KR20070067958A/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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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

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

Abstract

A driving method of an LCD(Liquid Crystal Display) is provided to selectively turn on or off plural lamps of a backlight unit according to the use environment, thereby realizing low power consumption and improving lifespan of a lamp. At least two lamps of a backlight unit are selectively driven. A system body is driven. According to the use environment, the number of lamps for driving is set among at least two lamps. A driving program is checked according to the use environment. The use environment is any one of a moving picture play, a game play and a document work. The backlight unit is an edge light type and at least two lamps are arranged at a side of a light guide panel of the backlight unit. The backlight unit is arranged at the rear of a display unit and supplies the light to the display unit. The display unit includes a liquid crystal for controlling an amount of the transmission light from the backlight unit. A color filter substrate and a TFT(Thin Film Transistor) are bonded by interposing the liquid crystal.

Description

액정표시장치의 구동방법{DRIVING METHOD OF LIQUID CRYSTAL DISPLAY}DRIVING METHOD OF LIQUID CRYSTAL DISPLAY}

도1은 본 발명의 실시예에 따른 액정표시장치를 나타낸 분해사시도이다.1 is an exploded perspective view showing a liquid crystal display according to an embodiment of the present invention.

도2는 도1의 Ⅱ-Ⅱ'선에 따른 단면도이다.FIG. 2 is a cross-sectional view taken along line II-II 'of FIG. 1.

도3은 도1의 액정표시패널의 등가회로도이다.FIG. 3 is an equivalent circuit diagram of the liquid crystal display panel of FIG. 1.

도4는 도1의 램프를 사용환경에 따라 선택적으로 구동하기 위한 흐름도이다.4 is a flowchart for selectively driving the lamp of FIG. 1 according to a usage environment.

<도면의 주요부분에 대한 부호설명><Code Description of Main Parts of Drawing>

10 : 액정표시장치 20 : 백라이트유닛10 liquid crystal display device 20 backlight unit

30: 광원유닛 40 : 램프30: light source unit 40: lamp

70 : 도광판 100 : 디스플레이유닛70: light guide plate 100: display unit

본 발명은 액정표시장치의 구동방법에 관한 것으로, 특히 사용환경에 따라 다수개의 램프를 선택적으로 점등 및 소등할 수 있는 액정표시장치의 구동방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a liquid crystal display device, and more particularly, to a method of driving a liquid crystal display device capable of selectively turning on and off a plurality of lamps according to a use environment.

정보화 사회가 발전함에 따라 표시장치에 대한 요구도 다양한 형태로 점증하고 있으며, 이에 부응하여 근래에는 액정표시장치(liquid crystal display, LCD), 플라즈마디스플레이패널(plasma display panel, PDP), 유기발광다이오드(organic light emitting diodes, OLED) 등 많은 평판표시장치(flat panel display, FPD)가 사용되고 있다. 그 중에 화질이 우수하고 소형화 뿐만 아니라 대형화가 가능한 액정표시장치가 가장 널리 사용되고 있다.As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display (LCD), plasma display panel (PDP) and organic light emitting diode ( Many flat panel displays (FPDs), such as organic light emitting diodes (OLEDs), are used. Among them, a liquid crystal display device having excellent image quality and capable of miniaturization as well as large size is most widely used.

액정표시장치는 액정의 광투과율을 이용해 화상을 표시하는 장치이다. 이러한 액정표시장치는 화상을 표시하는 디스플레이유닛을 포함하고 있다. 그런데, 액정표시장치는 스스로 광을 발하지 못하는 수광소자의 일종이므로 디스플레이유닛 이외에 디스플레이유닛에 광을 제공하는 백라이트유닛을 더 포함하고 있다. 백라이트유닛은 광을 생성하는 램프 및 다수의 광학부재(예를 들어, 도광판, 반사시트, 광학시트 등)를 포함하고 있다. 현재 램프로써 양산성 및 신뢰성이 이미 검증된 씨씨에프엘(CCFL, cold cathode fluorescent lamp)이 가장 널리 사용되고 있다.A liquid crystal display device is an apparatus which displays an image using the light transmittance of liquid crystal. Such a liquid crystal display device includes a display unit for displaying an image. However, the liquid crystal display device is a kind of light receiving element that does not emit light by itself, and further includes a backlight unit that provides light to the display unit in addition to the display unit. The backlight unit includes a lamp for generating light and a plurality of optical members (for example, a light guide plate, a reflective sheet, an optical sheet, and the like). Currently, a cold cathode fluorescent lamp (CCFL), which has been proven in mass production and reliability, is the most widely used lamp.

그런데, 씨씨에프엘은 액정표시장치의 고휘도 및 대형화의 추세에 따라 다수개가 사용되는데 액정표시장치의 사용환경과는 상관없이 모든 램프가 동시에 점등 및 소등된다. 이 때문에, 액정표시장치의 소비전력이 상승하게 되며 램프의 수명이 감소하게 된다.However, CFCs are used in plural in accordance with the trend of high brightness and large size of the liquid crystal display, and all lamps are turned on and off at the same time regardless of the use environment of the liquid crystal display. For this reason, the power consumption of the liquid crystal display device is increased and the life of the lamp is reduced.

따라서, 본 발명의 목적은 사용환경에 따라 다수개의 램프를 선택적으로 점등 및 소등할 수 있는 액정표시장치의 구동방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a method of driving a liquid crystal display device capable of selectively turning on and turning off a plurality of lamps according to a use environment.

상기 목적을 달성하기 위하여 본 발명은 사용환경에 따라 백라이트유닛의 적어도 2개의 램프를 선택적으로 구동하는 단계를 포함하는 것을 특징으로 하는 액정표시장치의 구동방법을 제공한다.In order to achieve the above object, the present invention provides a method of driving a liquid crystal display device comprising the step of selectively driving at least two lamps of the backlight unit according to the use environment.

상기 백라이트유닛은 상기 적어도 2개의 램프가 상기 백라이트유닛의 도광판의 측면에 배치되는 에지라이트형인 것을 특징으로 한다.The backlight unit is characterized in that the at least two lamps of the edge light type disposed on the side of the light guide plate of the backlight unit.

상기 사용환경은 동영상감상, 게임 및 문서작업(또는, 인터넷검색) 중 적어도 어느 하나인 것을 특징으로 한다.The use environment is characterized in that at least one of the video viewing, games and document work (or, Internet search).

상기 적어도 2개의 램프를 선택적으로 구동하는 단계는 시스템본체를 구동하는 단계와; 상기 사용환경에 따라 상기 적어도 2개의 램프 중 구동시키려는 램프의 개수를 설정하는 단계와; 상기 사용환경에 따른 동작 프로그램을 확인하는 단계를 포함하는 것을 특징으로 한다.Selectively driving the at least two lamps comprises driving a system body; Setting a number of lamps to be driven among the at least two lamps according to the usage environment; And identifying an operation program according to the use environment.

상기 목적 외에 본 발명의 다른 목적 및 특징들은 첨부한 도면들을 참조한 실시예에 대한 설명을 통하여 명백하게 드러나게 될 것이다.Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

이하, 첨부한 도면들을 참조하여 본 발명의 바람직한 실시예에 대하여 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도1은 본 발명의 실시예에 따른 액정표시장치를 나타낸 분해사시도이고, 도2 는 도1의 Ⅱ-Ⅱ'선에 따른 단면도이다.1 is an exploded perspective view showing a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II 'of FIG.

도1 및 도2를 참조하면, 본 발명의 실시예에 따른 액정표시장치(10)는 화상을 표시하는 디스플레이유닛(100)과, 디스플레이유닛(100)의 배면에 배치되어 디스플레이유닛(100)에 광을 공급하는 백라이트유닛(20)을 포함하고 있다.1 and 2, the liquid crystal display device 10 according to an embodiment of the present invention is disposed on the display unit 100 for displaying an image and the back of the display unit 100, It includes a backlight unit 20 for supplying light.

디스플레이유닛(100)은 화상을 표시하는 액정표시패널(110)과, 액정표시패널(110)을 구동하는 인쇄회로기판(160)을 포함하고 있다.The display unit 100 includes a liquid crystal display panel 110 for displaying an image and a printed circuit board 160 for driving the liquid crystal display panel 110.

액정표시패널(110)은 백라이트유닛(20)으로부터의 광의 투과량을 조절하는 액정과, 액정을 사이에 두고 합착된 칼라필터기판(120) 및 박막트랜지스터기판(130)을 포함하고 있다.The liquid crystal display panel 110 includes a liquid crystal for controlling the amount of light transmitted from the backlight unit 20, a color filter substrate 120 and a thin film transistor substrate 130 bonded together with the liquid crystal interposed therebetween.

액정은 박막트랜지스터기판(130)의 화소전극으로부터의 화소전압과 칼라필터기판(120)의 공통전극으로부터의 공통전압의 차이에 의해 회전하여 광투과량을 조절한다.The liquid crystal is rotated by the difference between the pixel voltage from the pixel electrode of the thin film transistor substrate 130 and the common voltage from the common electrode of the color filter substrate 120 to adjust the light transmittance.

칼라필터기판(120)은 유리나 플라스틱 같은 절연기판 상에 빛샘 방지를 위한 블랙매트릭스와, 색구현을 위한 칼라필터와, 액정에 공통전압을 인가하기 위한 공통전극과, 셀갭을 유지하기 위한 컬럼스페이서를 포함하고 있다.The color filter substrate 120 includes a black matrix for preventing light leakage on an insulating substrate such as glass or plastic, a color filter for color implementation, a common electrode for applying a common voltage to the liquid crystal, and a column spacer for maintaining a cell gap. It is included.

블랙매트릭스는 외부광 차단 및 박막트랜지스터의 광누설전류를 막기 위해 광을 차단할 수 있는 검은색을 띠는 금속 또는 유기물질로 형성된다.The black matrix is formed of black metal or organic material that can block light in order to block external light and prevent light leakage current of the thin film transistor.

칼라필터는 적, 녹, 청색칼라필터를 구비하며 이들 각각은 특정 파장의 광을 투과 또는 흡수하는 적, 녹, 청색안료를 포함하고 있다. 칼라필터는 적, 녹, 청색칼라필터 각각을 통과한 적, 녹, 청색광의 가법혼색을 통해 색을 구현한다.Color filters include red, green, and blue color filters, each of which contains red, green, and blue pigments that transmit or absorb light of a particular wavelength. The color filter realizes color through additive mixing of red, green, and blue light passing through each of the red, green, and blue color filters.

공통전극은 액정에 공통전압을 인가하기 위해 ITO 또는 IZO와 같은 투명한 도전성 금속으로 형성된다.The common electrode is formed of a transparent conductive metal such as ITO or IZO to apply a common voltage to the liquid crystal.

컬럼스페이서는 유기물질로 형성되어 있으며 셀갭을 유지한다.The column spacer is formed of an organic material and maintains a cell gap.

박막트랜지스터기판(130)은 유리나 플라스틱 같은 또 다른 절연기판 상에 게이트선 및 데이타선의 교차로 인해 정의된 화소영역에 형성된 박막트랜지스터와, 박막트랜지스터와 접속된 화소전극 및 스토리지전극과, 게이트선을 구동하기 위한 게이트구동회로를 포함하고 있다.The thin film transistor substrate 130 is a thin film transistor formed in a pixel region defined by the intersection of gate lines and data lines on another insulating substrate such as glass or plastic, pixel electrodes and storage electrodes connected to the thin film transistors, and driving the gate lines. It includes a gate driving circuit for.

박막트랜지스터는 도3에 도시된 바와 같이, 게이트선(140) 및 데이타선(150)과 접속되어 형성되어 있다. 이러한 박막트랜지스터(TFT)는 게이트선(140)으로부터 공급되는 스캔신호에 응답하여 턴온/턴오프된다. 턴온된 박막트랜지스터(TFT)는 데이타선(150)으로부터 입력된 데이타전압을 화소전극에 화소전압으로 출력한다.As illustrated in FIG. 3, the thin film transistor is formed by being connected to the gate line 140 and the data line 150. The thin film transistor TFT is turned on / off in response to a scan signal supplied from the gate line 140. The turned-on TFT outputs the data voltage input from the data line 150 as a pixel voltage to the pixel electrode.

화소전극은 자신에게 충전된 화소전압을 액정에 인가한다. 이를 위해, 화소전극은 ITO 또는 IZO와 같은 투명한 도전성 금속으로 형성된다. 이러한 화소전극과 액정, 공통전극으로 인해 액정셀(Clc)이 형성된다.The pixel electrode applies the pixel voltage charged therein to the liquid crystal. For this purpose, the pixel electrode is formed of a transparent conductive metal such as ITO or IZO. The liquid crystal cell Clc is formed by the pixel electrode, the liquid crystal, and the common electrode.

스토리지전극은 자신과 접속된 스토리지선으로부터의 공통전압을 사용하여 화소전극에 충전된 화소전압을 한 프레임동안 유지시킨다. 이러한 스토리지전극과 화소전극, 스토리지전극과 화소전극 사이의 적어도 하나의 절연막으로 인해 스토리지캐패시터(Cst)가 형성된다.The storage electrode maintains the pixel voltage charged in the pixel electrode for one frame using a common voltage from the storage line connected thereto. The storage capacitor Cst is formed by at least one insulating layer between the storage electrode and the pixel electrode and between the storage electrode and the pixel electrode.

게이트구동회로는 박막트랜지스터기판(130) 상에 다수개의 박막트랜지스터를 가지도록 집적(integration)되어 있으며 게이트선(140)을 구동한다.The gate driving circuit is integrated to have a plurality of thin film transistors on the thin film transistor substrate 130 and drives the gate line 140.

인쇄회로기판(160)은 데이타선(150)을 구동하기 위한 데이타구동회로(170)가 실장된 데이타TCP(180)에 의해서 박막트랜지스터기판(130)과 전기적으로 연결된다. 인쇄회로기판(160)에는 액정표시패널(110)을 구동하기 위해 다수의 회로부품이 실장되어 있다.The printed circuit board 160 is electrically connected to the thin film transistor substrate 130 by a data TCP 180 mounted with a data driving circuit 170 for driving the data line 150. A plurality of circuit components are mounted on the printed circuit board 160 to drive the liquid crystal display panel 110.

백라이트유닛(20)은 광을 생성하는 광원유닛(30)과, 광원유닛(30)의 측면에 배치되는 도광판(70)과, 도광판(70)의 하부에 배치되는 반사시트(80)와, 도광판(70)의 상부에 배치되는 광학시트(90)를 포함하고 있다. 이러한 백라이트유닛(20)은 백라이트유닛(20)의 하부에 배치되는 제1몰드프레임(240)에 수납되며 제2몰드프레임(250) 상에 디스플레이유닛(100)이 안착되면 탑샤시(260)와 바텀샤시(270)의 체결에 의해 고정된다.The backlight unit 20 includes a light source unit 30 that generates light, a light guide plate 70 disposed on a side surface of the light source unit 30, a reflective sheet 80 disposed below the light guide plate 70, and a light guide plate. An optical sheet 90 disposed above the 70 is included. The backlight unit 20 is accommodated in the first mold frame 240 disposed under the backlight unit 20 and the display unit 100 is seated on the second mold frame 250 and the top chassis 260. The bottom chassis 270 is fixed by the fastening.

광원유닛(30)은 광을 발생하는 적어도 2개의 램프(40)와, 램프(40)로부터 생성된 광을 도광판(70) 방향으로 반사시키는 램프리플렉터(50)를 포함하고 있다.The light source unit 30 includes at least two lamps 40 for generating light, and a lamp reflector 50 for reflecting light generated from the lamps 40 toward the light guide plate 70.

램프(40)는 광을 생성하기 위해 막대 형상을 갖는 적어도 2개인 씨씨에프엘로 구성되며 램프(40)의 양단부에는 램프(40)에 구동전압을 인가하기 위한 램프전극선(60)이 연결된다.The lamp 40 is composed of at least two CFCs having a rod shape for generating light, and lamp electrode lines 60 for applying a driving voltage to the lamp 40 are connected to both ends of the lamp 40.

이러한 램프(40)는 액정표시장치(10)의 사용환경에 따라 선택적으로 점등 및 소등된다. 다시말하면 램프(40)는 사용자의 사용환경에 따라 선택적으로 구동된다. 여기서, 사용환경이란 액정표시장치(10)의 사용자가 동영상감상을 하거나 게임을 하거나 문서작업(또는, 인터넷검색) 등을 하는 것을 말한다. 예를 들어, 1개의 액정표시장치(10)에 포함된 램프(40)의 개수가 총 4개라 할 때 동영상감상 시에는 4 개의 램프(40)가 모두 구동되는 반면에 게임을 할 때는 2개의 램프(40)만 구동하여 불필요한 소비전력을 감소시킬 수 있다. 또한, 문서작업(또는, 인터넷검색)의 경우 고휘도가 필요하지 않기 때문에 1개의 램프(40)만 구동되게 한다. 즉, 액정표시장치(10)의 사용환경에 따라 구동되는 램프(40)수를 조절함으로써 사용자는 액정표시장치(10)의 저소비전력 및 램프(40) 수명 향상을 확보할 수 있다. 그러나, 사용환경은 상술한 바에 한정되지 않으며 사용자는 개개인의 취향 혹은 필요에 따라 사용환경에 따른 구동 램프(40)수를 조절할 수 있다. 다시말하면, 예를 들어, 4개의 램프(40)를 가지는 액정표시장치(10)를 가지고 사용자가 게임을 하고자 할 때, 4개 또는 3개의 램프(40)를 구동할 수 있다. 또한, 램프(40)의 개수는 상술한 바에 한정되지 않는다. 다시말하면, 예를 들어, 2개의 램프(40)를 가지는 액정표시장치(10)를 가지고 사용자가 게임을 하고자 할 때, 1개의 램프(40)를 구동함과 아울러 동영상 감상을 할때는 2개의 램프(40)를 모두 구동할 수 있다.The lamp 40 is selectively turned on and off depending on the use environment of the liquid crystal display device 10. In other words, the lamp 40 is selectively driven according to the use environment of the user. Here, the usage environment means that the user of the liquid crystal display device 10 plays a video, plays a game, or performs a paper work (or an internet search). For example, when the total number of lamps 40 included in one liquid crystal display device 10 is four, all four lamps 40 are driven when watching a video, while two lamps are used when playing a game. By driving only 40, unnecessary power consumption can be reduced. In addition, in case of document work (or internet search), only one lamp 40 is driven because high brightness is not required. That is, by adjusting the number of lamps 40 driven according to the use environment of the liquid crystal display device 10, the user can secure the low power consumption and the life of the lamp 40 of the liquid crystal display device 10. However, the use environment is not limited to the above description, and the user may adjust the number of driving lamps 40 according to the use environment according to individual preferences or needs. In other words, for example, when the user wants to play a game with the liquid crystal display device 10 having four lamps 40, four or three lamps 40 may be driven. The number of lamps 40 is not limited to the above. In other words, for example, when the user wants to play a game with the liquid crystal display device 10 having two lamps 40, the driving of one lamp 40 and two lamps when watching a video ( 40) can be driven.

그런데, 백라이트유닛(20)은 램프(40)가 도광판(70) 측면에 위치해서 램프(40)로부터의 광이 도광판(70)을 거치면서 디스플레이유닛(100)으로 향하도록 하는 에지라이트(edge-light)형인 것이 바람직하다. 만약, 램프가 디스플레이유닛 배면에 위치하여 램프로부터의 광이 디스플레이유닛으로 향하여 도광판이 필요없는 탑다운(top-down)형에서는 사용환경에 따른 선택적인 램프 구동 시 액정표시장치는 휘도차가 발생하게 된다. 즉, 예를 들어, 탑다운형의 백라이트유닛이 채용됨과 아울러 4개의 램프를 채용하는 액정표시장치에서 2개의 램프만을 구동하게 되면 디스플레이유닛의 밝고 어두운 부분이 발생하게 된다. 따라서, 백라이트유닛은 에지라 이트형인 것이 바람직하다.However, the backlight unit 20 has an edge light for directing the lamp 40 to the display unit 100 while the lamp 40 is positioned at the side of the light guide plate 70 so that the light from the lamp 40 passes through the light guide plate 70. light) is preferable. If the lamp is located on the back of the display unit and the light from the lamp is directed to the display unit, the top-down type, in which the light guide plate is not required, causes a difference in luminance in the liquid crystal display when the lamp is selectively driven according to the use environment. . That is, for example, when the top-down type backlight unit is used and only two lamps are driven in the liquid crystal display device employing four lamps, bright and dark portions of the display unit are generated. Therefore, the backlight unit is preferably of the edge light type.

램프리플렉터(50)는 반사율이 높은 재질로 이루어지거나 램프(40)를 커버하는 커버면에 반사 부재가 코팅된 구조를 가짐으로써 램프(40)에서 발생된 광을 도광판(70) 방향으로 반사하여 광의 효율을 향상시킨다.The lamp reflector 50 is made of a material having high reflectance or has a structure in which a reflective member is coated on a cover surface covering the lamp 40 to reflect the light generated from the lamp 40 toward the light guide plate 70. Improve the efficiency.

도광판(70)은 주로 아크릴 재질로 이루어져 있으며 램프(40)로부터 출광된 광을 액정표시패널(110)로 가이드한다.The light guide plate 70 is mainly made of acrylic material and guides the light emitted from the lamp 40 to the liquid crystal display panel 110.

반사시트(80)는 도광판(70) 하부로 출광된 광을 도광판(70)으로 반사시킨다. 이를 위해, 반사시트(80)는 모재(Base Material)에 반사율이 높은 반사부재가 코팅되어 있다.The reflective sheet 80 reflects the light emitted under the light guide plate 70 to the light guide plate 70. To this end, the reflective sheet 80 is coated with a reflective member having a high reflectance on the base material.

광학시트(90)는 도광판(70)에서 출광되는 광을 산란시켜 골고루 퍼지게 하는 확산시트와, 확산시트에서 나오는 광을 굴절, 집광시켜 휘도를 상승시키는 프리즘시트와, 스크래치(scratch) 발생이 쉽고 모아레 현상이 나타날 수 있는 프리즘시트를 보호해주며 광을 확산시켜 프리즘시트에 의해 좁아진 시야각을 넓혀주는 보호시트와, 휘도를 향상시키는 휘도향상시트들 중 액정표시장치(10)의 특성에 맞게 일반적으로 2장 이상으로 구성된다.The optical sheet 90 includes a diffusion sheet that scatters light emitted from the light guide plate 70 and spreads it evenly, a prism sheet that raises brightness by refracting and condensing the light emitted from the diffusion sheet, and scratches are easy and moire is easy. Two protective sheets are provided to protect the prism sheet from which the phenomenon may occur and to spread the light to widen the viewing angle narrowed by the prism sheet, and to improve the luminance. It consists of the above.

도4는 도1의 램프를 사용환경에 따라 선택적으로 구동하기 위한 흐름도이다.4 is a flowchart for selectively driving the lamp of FIG. 1 according to a usage environment.

도4를 참조하면, 먼저 사용자는 시스템본체를 구동시킨다. 이후, 사용자의 취향 및 필요에 따라 사용환경별 램프 구동 수를 설정한다. 예를 들어, 총 4개의 램프가 있는 경우에 동영상감상 시 4개를 모두 구동하고 게임시에는 2개를 구동할 수 있도록 사용자는 사용환경별 구동되는 램프의 개수를 설정한다. 이어, 동작하는 프로그램을 확인한다. 먼저, 동영상 프로그램이 동작된다면 4개의 램프가 모두 구동되는 4램프모드가 선택되어 4개의 램프가 모두 구동된다. 만약 동영상 프로그램이 동작되지 않는다면 게임 프로그램인지를 확인하여 게임 프로그램이 동작된다면 2개의 램프가 구동되는 2램프모드가 선택되어 2개의 램프가 구동된다. 그리고, 게임 프로그램이 동작되지 않는다면 1개의 램프가 구동되는 1램프모드가 선택되어 1개의 램프가 구동된다.Referring to Figure 4, first, the user drives the system body. Then, the number of lamp driving for each use environment is set according to the user's taste and need. For example, if there are four lamps in total, the user sets the number of lamps driven by the use environment so that all four can be driven when watching a video and two can be driven during a game. Next, check the running program. First, if the video program is operated, the 4 lamp mode in which all four lamps are driven is selected, and all four lamps are driven. If the video program does not work, check whether it is a game program, and if the game program is operated, two lamp modes in which two lamps are driven are selected, and two lamps are driven. If the game program is not operated, one lamp mode in which one lamp is driven is selected to drive one lamp.

본 발명의 실시예에 따른 액정표시장치의 구동방법은 사용자의 취향(또는, 필요)에 따라 적어도 2개의 램프를 사용환경별 선택적으로 점등 및 소등한다. 이를 통해, 액정표시장치의 저소비전력을 구현함과 아울러 램프의 수명을 향상시킬 수 있다.In the method of driving the liquid crystal display according to the exemplary embodiment of the present invention, at least two lamps are selectively turned on and off according to the use environment according to the user's taste (or need). As a result, low power consumption of the liquid crystal display device can be realized, and the life of the lamp can be improved.

이상에서 설명한 본 발명의 상세한 설명에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당 기술분야의 숙련된 당업자 또는 해당 기술분야에 통상의 지식을 갖는 자라면 후술될 특허청구범위에 기재된 본 발명의 사상 및 기술 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the art.

따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허청구범위에 의해 정하여져야만 할 것이다.Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

사용환경에 따라 백라이트유닛의 적어도 2개의 램프를 선택적으로 구동하는 단계를 포함하는 것을 특징으로 하는 액정표시장치의 구동방법.And selectively driving at least two lamps of the backlight unit according to the usage environment. 제1항에 있어서,The method of claim 1, 상기 백라이트유닛은 상기 적어도 2개의 램프가 상기 백라이트유닛의 도광판의 측면에 배치되는 에지라이트형인 것을 특징으로 하는 액정표시장치의 구동방법.The backlight unit is a driving method of the liquid crystal display device, characterized in that the at least two lamps are edge light type disposed on the side of the light guide plate of the backlight unit. 제1항에 있어서,The method of claim 1, 상기 사용환경은 동영상감상, 게임 및 문서작업(또는, 인터넷검색) 중 적어도 어느 하나인 것을 특징으로 하는 액정표시장치의 구동방법.And the usage environment is at least one of a video viewing, a game, and a document work (or internet search). 제1항에 있어서,The method of claim 1, 상기 적어도 2개의 램프를 선택적으로 구동하는 단계는Selectively driving the at least two lamps 시스템본체를 구동하는 단계와;Driving the system body; 상기 사용환경에 따라 상기 적어도 2개의 램프 중 구동시키려는 램프의 개수를 설정하는 단계와;Setting a number of lamps to be driven among the at least two lamps according to the usage environment; 상기 사용환경에 따른 동작 프로그램을 확인하는 단계를 포함하는 것을 특징으로 하는 액정표시장치의 구동방법.And identifying an operation program according to the usage environment.
KR1020050129534A 2005-12-26 2005-12-26 Driving method of liquid crystal display KR20070067958A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7995028B2 (en) 2007-10-25 2011-08-09 Samsung Electronics Co., Ltd. Timing controller, liquid crystal display comprising the same and driving method of liquid crystal display
US8605026B2 (en) 2007-10-18 2013-12-10 Samsung Display Co., Ltd. Timing controller, liquid crystal display having the same, and method of driving liquid crystal display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8605026B2 (en) 2007-10-18 2013-12-10 Samsung Display Co., Ltd. Timing controller, liquid crystal display having the same, and method of driving liquid crystal display
US7995028B2 (en) 2007-10-25 2011-08-09 Samsung Electronics Co., Ltd. Timing controller, liquid crystal display comprising the same and driving method of liquid crystal display

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