DE69006272T2 - 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
DE69006272T2
DE69006272T2 DE90401866T DE69006272T DE69006272T2 DE 69006272 T2 DE69006272 T2 DE 69006272T2 DE 90401866 T DE90401866 T DE 90401866T DE 69006272 T DE69006272 T DE 69006272T DE 69006272 T2 DE69006272 T2 DE 69006272T2
Authority
DE
Germany
Prior art keywords
dimming
fluorescent lamp
lcd display
display backlight
backlight
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 - Lifetime
Application number
DE90401866T
Other languages
English (en)
Other versions
DE69006272D1 (de
Inventor
Georges Lavaud
Jean-Pierre Bouron
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Application granted granted Critical
Publication of DE69006272D1 publication Critical patent/DE69006272D1/de
Publication of DE69006272T2 publication Critical patent/DE69006272T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/04—Dimming circuit for fluorescent lamps

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Inverter Devices (AREA)
DE90401866T 1989-06-30 1990-06-28 Verfahren und Vorrichtung zum Dimmen einer Leuchtstofflampe in einer LCD-Anzeigen-Rückbeleuchtung. Expired - Lifetime DE69006272T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8908807A FR2649277B1 (fr) 1989-06-30 1989-06-30 Procede et dispositif de gradation de lumiere pour lampe fluorescente d'eclairage arriere d'ecran a cristaux liquides

Publications (2)

Publication Number Publication Date
DE69006272D1 DE69006272D1 (de) 1994-03-10
DE69006272T2 true DE69006272T2 (de) 1994-05-05

Family

ID=9383336

Family Applications (1)

Application Number Title Priority Date Filing Date
DE90401866T Expired - Lifetime DE69006272T2 (de) 1989-06-30 1990-06-28 Verfahren und Vorrichtung zum Dimmen einer Leuchtstofflampe in einer LCD-Anzeigen-Rückbeleuchtung.

Country Status (7)

Country Link
US (1) US5105127A (de)
EP (1) EP0406116B1 (de)
JP (1) JPH0364895A (de)
CA (1) CA2019628A1 (de)
DE (1) DE69006272T2 (de)
FR (1) FR2649277B1 (de)
HK (1) HK83596A (de)

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Also Published As

Publication number Publication date
EP0406116A1 (de) 1991-01-02
CA2019628A1 (en) 1990-12-31
EP0406116B1 (de) 1994-01-26
DE69006272D1 (de) 1994-03-10
FR2649277A1 (fr) 1991-01-04
US5105127A (en) 1992-04-14
JPH0364895A (ja) 1991-03-20
FR2649277B1 (fr) 1996-05-31
HK83596A (en) 1996-05-17

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