WO2003098326A3 - Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same - Google Patents

Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same Download PDF

Info

Publication number
WO2003098326A3
WO2003098326A3 PCT/KR2003/000839 KR0300839W WO03098326A3 WO 2003098326 A3 WO2003098326 A3 WO 2003098326A3 KR 0300839 W KR0300839 W KR 0300839W WO 03098326 A3 WO03098326 A3 WO 03098326A3
Authority
WO
WIPO (PCT)
Prior art keywords
power signal
backlight assembly
transistor
signal
external electrode
Prior art date
Application number
PCT/KR2003/000839
Other languages
French (fr)
Other versions
WO2003098326A2 (en
Inventor
Hyeong-Suk Yoo
Sung-Chul Kang
Moon-Shik Kang
Jeong-Hwan Lee
Keun-Woo Lee
Original Assignee
Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to AU2003223131A priority Critical patent/AU2003223131A1/en
Priority to EP03719245A priority patent/EP1506698A2/en
Publication of WO2003098326A2 publication Critical patent/WO2003098326A2/en
Publication of WO2003098326A3 publication Critical patent/WO2003098326A3/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2824—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
    • 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
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/133612—Electrical details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

A backlight assembly has a lamp driving device for driving external electrode fluorescent lamps (EEFLs) (110) parallel connected each other. The lamp driving device includes a power switch transistor (Q1), a diode (D1), an inverter (120) and a PWM controller (140). The transistor (Q1) converts external DC power signal (Vin) into pulse power signal based on switching signal, the diode (D1) prevents rush current from flowing into the transistor (Q1). The inverter (120) converts the pulse power signal into AC power signal, raises voltage level of the AC power signal, and provides the lamps (110) with the raised AC power signal. The PWM controller (140) is activated by external on/off signal to provide the transistor (Q1) with the switching signal so as to regulate voltage level of the AC power signal. The EEFLs (110) can maintain a constant current level, and the backlight assembly can have characteristics of uniform luminance, high luminance and high heat efficiency.
PCT/KR2003/000839 2002-05-17 2003-04-25 Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same WO2003098326A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003223131A AU2003223131A1 (en) 2002-05-17 2003-04-25 Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same
EP03719245A EP1506698A2 (en) 2002-05-17 2003-04-25 Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2002-0027461 2002-05-17
KR1020020027461A KR100857848B1 (en) 2002-05-17 2002-05-17 Back light assembly, method for driving the same, and liquid crystal display having the same

Publications (2)

Publication Number Publication Date
WO2003098326A2 WO2003098326A2 (en) 2003-11-27
WO2003098326A3 true WO2003098326A3 (en) 2004-09-10

Family

ID=29417415

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2003/000839 WO2003098326A2 (en) 2002-05-17 2003-04-25 Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same

Country Status (8)

Country Link
US (2) US20030214478A1 (en)
EP (1) EP1506698A2 (en)
JP (1) JP4744064B2 (en)
KR (1) KR100857848B1 (en)
CN (1) CN100339750C (en)
AU (1) AU2003223131A1 (en)
TW (1) TWI276035B (en)
WO (1) WO2003098326A2 (en)

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US9448451B2 (en) 2010-01-20 2016-09-20 Semiconductor Energy Laboratory Co., Ltd. Driving method of liquid crystal display device

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Publication number Priority date Publication date Assignee Title
US9448451B2 (en) 2010-01-20 2016-09-20 Semiconductor Energy Laboratory Co., Ltd. Driving method of liquid crystal display device

Also Published As

Publication number Publication date
CN100339750C (en) 2007-09-26
KR20030089299A (en) 2003-11-21
AU2003223131A8 (en) 2003-12-02
AU2003223131A1 (en) 2003-12-02
JP4744064B2 (en) 2011-08-10
TW200400485A (en) 2004-01-01
JP2004031338A (en) 2004-01-29
EP1506698A2 (en) 2005-02-16
TWI276035B (en) 2007-03-11
US20100045645A1 (en) 2010-02-25
US20030214478A1 (en) 2003-11-20
CN1458547A (en) 2003-11-26
KR100857848B1 (en) 2008-09-10
WO2003098326A2 (en) 2003-11-27

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