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FR2649277B1 - Procede et dispositif de gradation de lumiere pour lampe fluorescente d'eclairage arriere d'ecran a cristaux liquides - Google Patents

Procede et dispositif de gradation de lumiere pour lampe fluorescente d'eclairage arriere d'ecran a cristaux liquides

Info

Publication number
FR2649277B1
FR2649277B1 FR8908807A FR8908807A FR2649277B1 FR 2649277 B1 FR2649277 B1 FR 2649277B1 FR 8908807 A FR8908807 A FR 8908807A FR 8908807 A FR8908807 A FR 8908807A FR 2649277 B1 FR2649277 B1 FR 2649277B1
Authority
FR
France
Prior art keywords
liquid crystal
fluorescent lamp
crystal screen
rear lighting
grading light
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
FR8908807A
Other languages
English (en)
Other versions
FR2649277A1 (fr
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
Priority to FR8908807A priority Critical patent/FR2649277B1/fr
Priority to US07/541,766 priority patent/US5105127A/en
Priority to CA002019628A priority patent/CA2019628A1/fr
Priority to DE90401866T priority patent/DE69006272T2/de
Priority to EP90401866A priority patent/EP0406116B1/fr
Priority to JP2170357A priority patent/JPH0364895A/ja
Publication of FR2649277A1 publication Critical patent/FR2649277A1/fr
Priority to HK83596A priority patent/HK83596A/xx
Application granted granted Critical
Publication of FR2649277B1 publication Critical patent/FR2649277B1/fr
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)
  • Inverter Devices (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
FR8908807A 1989-06-30 1989-06-30 Procede et dispositif de gradation de lumiere pour lampe fluorescente d'eclairage arriere d'ecran a cristaux liquides Expired - Lifetime FR2649277B1 (fr)

Priority Applications (7)

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
US07/541,766 US5105127A (en) 1989-06-30 1990-06-21 Dimming method and device for fluorescent lamps used for backlighting of liquid crystal screens
CA002019628A CA2019628A1 (fr) 1989-06-30 1990-06-22 Methode et dispositif de gradation de la lumiere pour lampes fluorescentes d'eclairage de fond d'afficheurs a cristaux liquides
EP90401866A EP0406116B1 (fr) 1989-06-30 1990-06-28 Procédé et dispositif de gradation de lumière pour lampe fluorescente d'éclairage arrière d'écran à cristaux liquides
DE90401866T DE69006272T2 (de) 1989-06-30 1990-06-28 Verfahren und Vorrichtung zum Dimmen einer Leuchtstofflampe in einer LCD-Anzeigen-Rückbeleuchtung.
JP2170357A JPH0364895A (ja) 1989-06-30 1990-06-29 液晶スクリーンのバックライティングに用いる蛍光ランプの減光方法及び減光装置
HK83596A HK83596A (en) 1989-06-30 1996-05-09 Process and device for dimming a fluorescent lamp of an lcd backlight

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
FR2649277A1 FR2649277A1 (fr) 1991-01-04
FR2649277B1 true FR2649277B1 (fr) 1996-05-31

Family

ID=9383336

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8908807A Expired - Lifetime 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

Country Status (7)

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

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Also Published As

Publication number Publication date
US5105127A (en) 1992-04-14
JPH0364895A (ja) 1991-03-20
DE69006272D1 (de) 1994-03-10
CA2019628A1 (fr) 1990-12-31
HK83596A (en) 1996-05-17
EP0406116B1 (fr) 1994-01-26
EP0406116A1 (fr) 1991-01-02
DE69006272T2 (de) 1994-05-05
FR2649277A1 (fr) 1991-01-04

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