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 Download PDF

Info

Publication number
EP1863008A3
EP1863008A3 EP07108548A EP07108548A EP1863008A3 EP 1863008 A3 EP1863008 A3 EP 1863008A3 EP 07108548 A EP07108548 A EP 07108548A EP 07108548 A EP07108548 A EP 07108548A EP 1863008 A3 EP1863008 A3 EP 1863008A3
Authority
EP
European Patent Office
Prior art keywords
time periods
backlight
light
contrast ratio
elementary
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
EP07108548A
Other languages
German (de)
French (fr)
Other versions
EP1863008B1 (en
EP1863008A2 (en
Inventor
Didier Ploquin
Philippe Machand
Gérard Morizot
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.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
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
Priority claimed from EP06290910A external-priority patent/EP1863006A1/en
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP07108548.4A priority Critical patent/EP1863008B1/en
Publication of EP1863008A2 publication Critical patent/EP1863008A2/en
Publication of EP1863008A3 publication Critical patent/EP1863008A3/en
Application granted granted Critical
Publication of EP1863008B1 publication Critical patent/EP1863008B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

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.
EP07108548.4A 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus Expired - Fee Related EP1863008B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07108548.4A EP1863008B1 (en) 2006-06-02 2007-05-21 Method and circuit for controlling the backlighting system of a display apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06290910A EP1863006A1 (en) 2006-06-02 2006-06-02 Method and circuit for controlling the backlight of a display apparatus
EP07108548.4A 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 EP1863008A2 (en) 2007-12-05
EP1863008A3 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
EP07108548.4A Expired - Fee Related 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 (2)

* 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
CN114724494B (en) * 2020-12-22 2023-08-18 酷矽半导体科技(上海)有限公司 Display screen, display algorithm, display data processing method and current adjusting method

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
EP1863008B1 (en) 2018-02-28
EP1863008A2 (en) 2007-12-05

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