WO2009126124A1 - Commande de rétroéclairage dynamique pour afficheurs vidéo - Google Patents

Commande de rétroéclairage dynamique pour afficheurs vidéo Download PDF

Info

Publication number
WO2009126124A1
WO2009126124A1 PCT/US2008/004654 US2008004654W WO2009126124A1 WO 2009126124 A1 WO2009126124 A1 WO 2009126124A1 US 2008004654 W US2008004654 W US 2008004654W WO 2009126124 A1 WO2009126124 A1 WO 2009126124A1
Authority
WO
WIPO (PCT)
Prior art keywords
pixel
given
frames
backlight
backlight brightness
Prior art date
Application number
PCT/US2008/004654
Other languages
English (en)
Inventor
Ananth Sankar
Anurag Bist
Original Assignee
Moxair, 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 Moxair, Inc. filed Critical Moxair, Inc.
Priority to PCT/US2008/004654 priority Critical patent/WO2009126124A1/fr
Publication of WO2009126124A1 publication Critical patent/WO2009126124A1/fr
Priority to US12/931,553 priority patent/US20130342433A9/en

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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables

Definitions

  • Display devices are ubiquitous in battery-powered portable electronic devices such as notebook computers and mobile, hand-held telephones where, typically, they are the largest consumers of battery power.
  • TFT thin-film transistor
  • LCD liquid-crystal displays
  • the LCD panel consumes more than 30% of the device power and the backlight typically consumes more than 75% of the LCD power.
  • TFT thin-film transistor
  • the backlight typically consumes more than 75% of the LCD power.
  • the pixel-value to pixel-brightness mapping is usually not a linear relationship. It is typically defined by an exponential or "gamma" curve: where b is the brightness for pixel value x, max Jb is the maximum pixel brightness for a pixel value of 255, and ⁇ (gamma) is the parameter that controls the shape of the curve.
  • the gamma values for each display can be derived by measuring brightness for several pixel values, and fitting the gamma curve given in Equation 1 to the measured data.
  • Equation 2 For the pixel transform, use Equation 2 for each of the colors, R, G, and B separately.
  • the transform scale factor for each color is m R , m G , and m B ,
  • b max the maximum backlight brightness at which the power saved by backlight reduction is greater than the power consumed for transforming the video frames.
  • This power, for transforming the video frames may be expended in a separate subsystem such as a microporcessor connected to a display subsystem.
  • the backlight brightness levels may be evenly spaced, as is indicated when the levels all are equally likely. Or, if the typical brightness distribution has a strong mode around a particular value, then more brightness values may be used to advantage near that mode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

Un long fonctionnement de dispositifs alimentés par batteries comprenant un affichage visuel tel qu'un écran LCD dans un téléphone cellulaire ou dans un lecteur multimédia personnel dépend d'une faible consommation électrique du dispositif d'affichage. Pour économiser l'énergie de l'afficheur, une commande de rétroéclairage dynamique peut être utilisée, comprenant un réglage de la luminosité du rétro-éclairage combiné avec une transformation des données vidéo à afficher. Lors de l'affichage d'une vidéo ou d'un film, dans le but de minimiser le scintillement perçu, les changements dynamiques de la luminosité du rétro-éclairage peuvent être limités pour coïncider avec des changements de scène. Les changements de scène vidéo peuvent être déterminés avant leur utilisation ultime dans un dispositif client, et des informations de changement de scène disponibles peuvent être téléchargées avec la vidéo sur le dispositif client. Dans une variante, des informations de changement de scène telle que déterminées sur le dispositif client ou ailleurs peuvent être stockées sur le dispositif client en vue d'une utilisation postérieure pendant l'affichage vidéo effectif.
PCT/US2008/004654 2007-04-14 2008-04-09 Commande de rétroéclairage dynamique pour afficheurs vidéo WO2009126124A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2008/004654 WO2009126124A1 (fr) 2008-04-09 2008-04-09 Commande de rétroéclairage dynamique pour afficheurs vidéo
US12/931,553 US20130342433A9 (en) 2007-04-14 2011-02-04 Dynamic backlight control for video displays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2008/004654 WO2009126124A1 (fr) 2008-04-09 2008-04-09 Commande de rétroéclairage dynamique pour afficheurs vidéo

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/931,553 Continuation US20130342433A9 (en) 2007-04-14 2011-02-04 Dynamic backlight control for video displays

Publications (1)

Publication Number Publication Date
WO2009126124A1 true WO2009126124A1 (fr) 2009-10-15

Family

ID=41162112

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/004654 WO2009126124A1 (fr) 2007-04-14 2008-04-09 Commande de rétroéclairage dynamique pour afficheurs vidéo

Country Status (1)

Country Link
WO (1) WO2009126124A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2839456A4 (fr) * 2012-04-20 2016-02-24 Samsung Electronics Co Ltd Réduction de puissance d'afficheur au moyen d'informations sei
WO2023113825A1 (fr) * 2021-12-17 2023-06-22 Hewlett-Packard Development Company, L.P. Commandes de rétroéclairage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060280360A1 (en) * 1996-02-26 2006-12-14 Holub Richard A Color calibration of color image rendering devices
US20070080975A1 (en) * 2005-10-12 2007-04-12 Haruo Yamashita Visual processing device, display device, and integrated circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060280360A1 (en) * 1996-02-26 2006-12-14 Holub Richard A Color calibration of color image rendering devices
US20070080975A1 (en) * 2005-10-12 2007-04-12 Haruo Yamashita Visual processing device, display device, and integrated circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HAKOLA ET AL.: "PrintAccess", GRAPHIC ARTS IN FINLAND, vol. 34, February 2005 (2005-02-01), pages 12 - 59, Retrieved from the Internet <URL:http://www.media.tkk.fi/GTTS/GAiF/GAiF_PDF/GAiF2005_2-2.pdf> [retrieved on 20080729] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2839456A4 (fr) * 2012-04-20 2016-02-24 Samsung Electronics Co Ltd Réduction de puissance d'afficheur au moyen d'informations sei
WO2023113825A1 (fr) * 2021-12-17 2023-06-22 Hewlett-Packard Development Company, L.P. Commandes de rétroéclairage

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