DE69807751T2 - Verfahren und vorrichtung zum dimmen einer leuchtstofflampe in einer lcd-anzeigen-rückbeleuchtung - Google Patents

Verfahren und vorrichtung zum dimmen einer leuchtstofflampe in einer lcd-anzeigen-rückbeleuchtung

Info

Publication number
DE69807751T2
DE69807751T2 DE69807751T DE69807751T DE69807751T2 DE 69807751 T2 DE69807751 T2 DE 69807751T2 DE 69807751 T DE69807751 T DE 69807751T DE 69807751 T DE69807751 T DE 69807751T DE 69807751 T2 DE69807751 T2 DE 69807751T2
Authority
DE
Germany
Prior art keywords
power supply
lamp
inverter
switching means
switching
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE69807751T
Other languages
German (de)
English (en)
Other versions
DE69807751D1 (de
Inventor
R. Praiswater
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Inc
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Publication of DE69807751D1 publication Critical patent/DE69807751D1/de
Application granted granted Critical
Publication of DE69807751T2 publication Critical patent/DE69807751T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
DE69807751T 1997-12-24 1998-11-20 Verfahren und vorrichtung zum dimmen einer leuchtstofflampe in einer lcd-anzeigen-rückbeleuchtung Expired - Fee Related DE69807751T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/998,110 US5939830A (en) 1997-12-24 1997-12-24 Method and apparatus for dimming a lamp in a backlight of a liquid crystal display
PCT/US1998/024701 WO1999034651A1 (en) 1997-12-24 1998-11-20 Method and apparatus for dimming a lamp in a backlight of a liquid crystal display

Publications (2)

Publication Number Publication Date
DE69807751D1 DE69807751D1 (de) 2002-10-10
DE69807751T2 true DE69807751T2 (de) 2003-06-05

Family

ID=25544774

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69807751T Expired - Fee Related DE69807751T2 (de) 1997-12-24 1998-11-20 Verfahren und vorrichtung zum dimmen einer leuchtstofflampe in einer lcd-anzeigen-rückbeleuchtung

Country Status (9)

Country Link
US (1) US5939830A (enExample)
EP (1) EP1044588B1 (enExample)
JP (1) JP4249900B2 (enExample)
KR (1) KR100580850B1 (enExample)
DE (1) DE69807751T2 (enExample)
DK (1) DK1044588T3 (enExample)
IL (2) IL136975A0 (enExample)
TW (1) TW431122B (enExample)
WO (1) WO1999034651A1 (enExample)

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US8395577B2 (en) 2004-05-04 2013-03-12 Sharp Laboratories Of America, Inc. Liquid crystal display with illumination control
US7872631B2 (en) 2004-05-04 2011-01-18 Sharp Laboratories Of America, Inc. Liquid crystal display with temporal black point
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Also Published As

Publication number Publication date
DK1044588T3 (da) 2002-12-02
DE69807751D1 (de) 2002-10-10
KR100580850B1 (ko) 2006-05-16
TW431122B (en) 2001-04-21
IL136975A (en) 2006-07-05
IL136975A0 (en) 2001-06-14
EP1044588B1 (en) 2002-09-04
KR20010033591A (ko) 2001-04-25
JP4249900B2 (ja) 2009-04-08
JP2002500427A (ja) 2002-01-08
US5939830A (en) 1999-08-17
WO1999034651A1 (en) 1999-07-08
EP1044588A1 (en) 2000-10-18

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee