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EP1863008A3 - Method and circuit for controlling the backlighting system of a display apparatus - Google Patents

Method and circuit for controlling the backlighting system of a display apparatus

Info

Publication number
EP1863008A3
EP1863008A3 EP20070108548 EP07108548A EP1863008A3 EP 1863008 A3 EP1863008 A3 EP 1863008A3 EP 20070108548 EP20070108548 EP 20070108548 EP 07108548 A EP07108548 A EP 07108548A EP 1863008 A3 EP1863008 A3 EP 1863008A3
Authority
EP
Grant status
Application
Patent type
Prior art keywords
time
periods
light
elementary
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.)
Granted
Application number
EP20070108548
Other languages
German (de)
French (fr)
Other versions
EP1863008B1 (en )
EP1863008A2 (en )
Inventor
Gérard Morizot
Philippe Machand
Didier Ploquin
Original Assignee
Thomson Licensing 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

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/064Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source

Abstract

In a display device images are reproduced by controlling the amount of light provided by a light source by means of light modulators for individual pixels. Subsequent images are synchronised to each other by synchronisation signals (VB) regularly occurring at intervals corresponding to first time periods. The backlight is controlled to emit light during fractions of second time periods or whole second time periods which are equal to or shorter than first time periods. Several of the second time periods may be nested and evenly distributed within the first time period. The signals for driving the backlight are preferably generated in synchronism with the horizontal pixel clock. Each of the fractions of second time periods or whole second time periods during which light is emitted is divided into a number of elementary steps, wherein each elementary step corresponds to a number of pixel clock periods. The number of elementary steps is chosen according to the desired ratio of control of the backlight or contrast ratio, e.g. 100 elementary steps for a contrast ratio of 1:100. During each of the second time periods the backlight is controlled to be on for a number of elementary steps corresponding to the desired contrast ratio.
EP20070108548 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus Active EP1863008B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20060290910 EP1863006A1 (en) 2006-06-02 2006-06-02 Method and circuit for controlling the backlight of a display apparatus
EP20070108548 EP1863008B1 (en) 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070108548 EP1863008B1 (en) 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus

Publications (3)

Publication Number Publication Date
EP1863008A2 true EP1863008A2 (en) 2007-12-05
EP1863008A3 true true EP1863008A3 (en) 2009-07-01
EP1863008B1 EP1863008B1 (en) 2018-02-28

Family

ID=38646831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070108548 Active EP1863008B1 (en) 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus

Country Status (1)

Country Link
EP (1) EP1863008B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8378961B2 (en) * 2010-01-15 2013-02-19 Atmel Corporation Control of light-emitting-diode backlight illumination through frame insertion

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184117A (en) * 1989-06-28 1993-02-02 Zenith Data Systems Corporation Fluorescent backlight flicker control in an LCD display
EP0685831A1 (en) * 1994-05-31 1995-12-06 Sharp Kabushiki Kaisha Liquid crystal display with back-light control function
US20030011559A1 (en) * 2001-06-28 2003-01-16 Matsushita Electric Industrial Co., Ltd. Liquid crystal display device and manufacturing method thereof, and drive control method of lighting unit
US20040160435A1 (en) * 2003-02-14 2004-08-19 Ying Cui Real-time dynamic design of liquid crystal display (LCD) panel power management through brightness control
EP1489590A1 (en) * 2002-03-28 2004-12-22 Matsushita Electric Industries Co. Ltd. Liquid crystal display device
US20050052398A1 (en) * 2000-10-26 2005-03-10 Advanced Display Inc. Liquid crystal display
US20050078081A1 (en) * 2000-11-13 2005-04-14 Mitsubishi Denki Kabushiki Kaisha Liquid crystal display device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184117A (en) * 1989-06-28 1993-02-02 Zenith Data Systems Corporation Fluorescent backlight flicker control in an LCD display
EP0685831A1 (en) * 1994-05-31 1995-12-06 Sharp Kabushiki Kaisha Liquid crystal display with back-light control function
US20050052398A1 (en) * 2000-10-26 2005-03-10 Advanced Display Inc. Liquid crystal display
US20050078081A1 (en) * 2000-11-13 2005-04-14 Mitsubishi Denki Kabushiki Kaisha Liquid crystal display device
US20030011559A1 (en) * 2001-06-28 2003-01-16 Matsushita Electric Industrial Co., Ltd. Liquid crystal display device and manufacturing method thereof, and drive control method of lighting unit
EP1489590A1 (en) * 2002-03-28 2004-12-22 Matsushita Electric Industries Co. Ltd. Liquid crystal display device
US20040160435A1 (en) * 2003-02-14 2004-08-19 Ying Cui Real-time dynamic design of liquid crystal display (LCD) panel power management through brightness control

Also Published As

Publication number Publication date Type
EP1863008B1 (en) 2018-02-28 grant
EP1863008A2 (en) 2007-12-05 application

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