EP0883103A1 - Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur - Google Patents

Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur Download PDF

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Publication number
EP0883103A1
EP0883103A1 EP97401259A EP97401259A EP0883103A1 EP 0883103 A1 EP0883103 A1 EP 0883103A1 EP 97401259 A EP97401259 A EP 97401259A EP 97401259 A EP97401259 A EP 97401259A EP 0883103 A1 EP0883103 A1 EP 0883103A1
Authority
EP
European Patent Office
Prior art keywords
intensity
light source
color
controlling
display according
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
EP97401259A
Other languages
German (de)
English (en)
Other versions
EP0883103B1 (fr
Inventor
Yoshiharu Chikazawa
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.)
Technicolor SA
Original Assignee
Thomson Multimedia 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 Multimedia SA filed Critical Thomson Multimedia SA
Priority to EP97401259A priority Critical patent/EP0883103B1/fr
Priority to DE69740083T priority patent/DE69740083D1/de
Priority to JP15634398A priority patent/JPH1165537A/ja
Publication of EP0883103A1 publication Critical patent/EP0883103A1/fr
Application granted granted Critical
Publication of EP0883103B1 publication Critical patent/EP0883103B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • G09G3/36—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 using liquid crystals
    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3607—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 using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Definitions

  • the invention relates to a direct view liquid crystal display for colored images.
  • LCD Liquid crystal displays
  • TV Television
  • computer displays more particularly for portable computers called “lap top computers” and view-finders for video-cameras.
  • the most common displays of this type are direct view LCDs. These devices comprise generally a light source behind a LCD panel. This source is arranged to provide a uniform, or quasi-uniform, illumination of the back face of the panel, i.e. of the face which is opposite to the face which is viewed by the user.
  • a control element is usually provided for the manual adjustment of the intensity of the light source.
  • the invention is based on the observation that the colors of the displayed images vary with the intensity of the back source and/or with the intensity of the ambient light.
  • the color control circuit of the LCD comprises means for varying the color signals in view of the intensity of the back source and/or of the ambient light.
  • the color control circuit is preferably provided with a control input receiving a signal represents the intensity of the back source or the intensity of the ambient light.
  • the intensity or luminance of the back source is manually or automatically controlled and the control circuit of this intensity has an output connected to the control input of the color control circuit.
  • control input of the color control circuit receives a signal provided by an ambient light detector.
  • the colors may be controlled directly or through the ⁇ correction circuit.
  • CRT cathode ray tubes
  • the broadcasted ⁇ correction is such that CRTs provide a linear response. However the response differs from one tube to the other ; therefore each tube has further ⁇ correction means.
  • LCDs provide naturally a linear curve ; so they are equipped with circuits which compensate the broadcasted ⁇ correction.
  • the color control circuit is arranged in such a way that it comprises three ⁇ inputs, one for each color (red R, green G, blue B) and an interface circuit is provided with an input receiving a signal representing the intensity of the back source or of the ambient light and this interface circuit has three outputs providing ⁇ control signals for R, G and B.
  • the interface is for instance a ROM (read only memory) containing a table providing, for each value of the intensity of light, the ⁇ curves for each of the three colors.
  • ROM read only memory
  • Fig. 1 represents a conventionnal direct view LCD.
  • This display comprises a liquid crystal panel 10 having a front face 12 and a rear, or back, face 14.
  • This back face is uniformly illuminated by light provided by the combination of : a light source 16 (for instance in the shape of an elongated lamp having several branches), a diffuser 18 between the source 16 and back face 14, and a reflector 20 at the back of the source 16.
  • a light source 16 for instance in the shape of an elongated lamp having several branches
  • a diffuser 18 between the source 16 and back face 14
  • a reflector 20 at the back of the source 16.
  • the intensity of the light source 16 is controlled by an intensity control circuit, or luminance control circuit, 22 receiving power from a power supply 24 and comprising a manually operated control element 26.
  • This element 26 determines the intensity of the light source 16.
  • the intensity control circuit 22 has an output 28 connected to the input 30 of an interface circuit 32 comprising three outputs 32 1 , 32 2 and 32 3 which are connected, respectively, to the inputs 34 1 , 34 2 and 34 3 of a circuit 34 for controlling the colors and for ⁇ correction of panel 34.
  • the input 34 1 receives a signal controlling ⁇ R , i.e. ⁇ for the red (R) color.
  • the input 34 2 and 34 3 receive, respectively, signals controlling ⁇ G and ⁇ B , i.e. ⁇ for green (G) and blue (B).
  • the circuit 34 provides the color signals R, G and B to the panel 10.
  • the circuit 34 has an input 36 receiving the video signal.
  • This circuit is for instance the RGB decoder/driver sold under the reference CX A 1785 AR by Sony.
  • the manual adjustment is replaced by an automatic adjustment provided by a sensor 40 connected to a control input 22 1 of the intensity control circuit 22.
  • This sensor 40 detects the intensity of the ambient light.
  • the sensor 40 controls also the intensity of the light generated by the light source 16 ; however the colors of the LCD panel 12 are not controlled by the circuit 22 but by an interface circuit 42 which is similar to interface circuit 32 of figure 2 and figure 3.
  • Interface circuit 42 has, like circuit 32, an input 42 1 (which, here, receives a signal from sensor 40) and three outputs 42 2 , 42 3 , 42 4 connected to the respective inputs 34 1 , 34 2 and 34 3 of color control circuit 34 which control ⁇ R , ⁇ G and ⁇ B , respectively.
  • the signal from the luminance controller 22 or from the sensor 40 is provided to the control input of a color control circuit similar to circuit 34 of figures 2 and 3.
  • a color control circuit similar to circuit 34 of figures 2 and 3.
  • Such color control circuit has usually a manual adjustment.
  • the signal from the luminance controller or from the sensor is provided to the input which, in coventionnal circuits, receives the signal generated by manual adjustment.
  • Interface circuits 32 and 42 comprise a memory of the ROM type in which data are stored as tables corresponding to curves.
  • the signal at the input 30, or 42 1 is, inside circuit 32 or 42, divided into a given number of value ranges. To each range corresponds a set of three curves ⁇ R , ⁇ G and ⁇ B .
  • a curve ⁇ R (or ⁇ G or ⁇ B ) is a table providing the blue of the red signal for each quantized value of the R (or G or B) signal provided at the input 36 of color control circuit 34.
  • the color control circuit 34 will provide, through interface circuit 32 or 42, nominal values of ⁇ R, ⁇ G and ⁇ B for which the colors on screen 12 will appear the most actual or the most realistic for the viewer.
  • the tables in the circuit 32 or 42 provide a correction which maintains the colors when the intensity of ambient light or the intensity of the back source is changing.
  • the intensity is decreasing the ratio of the red component of the light increases with respect to the ratios of G and B components.
  • the correction must be such that the nominal ratios be maintained. This is obtained by a decrease of the R component or by an increase of G and B components.
  • the ratio of the blue (B) component is increasing with respect to the ratios of R and G components. Therefore it is necessary to reduce the B component with respect to the other components, more particularly with respect to the red (R) component.
  • an interface circuit comprises a memory of the RAM type in which is stored a set of three gamma curves ⁇ R , ⁇ G and ⁇ B corresponding to the present intensity of the ambient light or of the light source 16. These curves are provided by a central memory (ROM or hard disk for instance) of a computer in which are stored all ⁇ R, ⁇ G and ⁇ B curves corresponding to various intensities.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
EP97401259A 1997-06-05 1997-06-05 Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur Expired - Lifetime EP0883103B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97401259A EP0883103B1 (fr) 1997-06-05 1997-06-05 Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur
DE69740083T DE69740083D1 (de) 1997-06-05 1997-06-05 Flüssigkristallanzeige für Direktbetrachtung mit automatischer Farbeinstellung
JP15634398A JPH1165537A (ja) 1997-06-05 1998-06-04 カラー画像用の直視液晶表示器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97401259A EP0883103B1 (fr) 1997-06-05 1997-06-05 Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur

Publications (2)

Publication Number Publication Date
EP0883103A1 true EP0883103A1 (fr) 1998-12-09
EP0883103B1 EP0883103B1 (fr) 2010-12-22

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ID=8229771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97401259A Expired - Lifetime EP0883103B1 (fr) 1997-06-05 1997-06-05 Affichage à cristaux liquides à vue directe avec réglage automatique de la couleur

Country Status (3)

Country Link
EP (1) EP0883103B1 (fr)
JP (1) JPH1165537A (fr)
DE (1) DE69740083D1 (fr)

Cited By (31)

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EP1137266A2 (fr) * 2000-03-24 2001-09-26 Sharp Kabushiki Kaisha Appareil de traitement d'images et son utilisation dans un appareil d'affichage d'images
EP1158484A2 (fr) * 2000-05-25 2001-11-28 Seiko Epson Corporation Traitement de données d'image fournies à un dispositif d'affichage
EP1220193A2 (fr) * 2000-12-22 2002-07-03 Visteon Global Technologies, Inc. Système et méthode de réduction de l'erreur d'offset de luminosité pour un dispositif d'affichage
GB2372135A (en) * 2001-01-31 2002-08-14 Nokia Mobile Phones Ltd Improved liquid crystal display device
EP1249818A2 (fr) * 2000-10-30 2002-10-16 Matsushita Electric Industrial Co., Ltd. Appareil électronique et support d'enregistrement associé
EP1251482A2 (fr) * 2001-04-19 2002-10-23 Mitsubishi Denki Kabushiki Kaisha Système d'ajustement automatique de la qualité d'image
WO2003003340A1 (fr) * 2001-06-28 2003-01-09 Intel Corporation Procede et dispositif de gestion de puissance pour ecran plat
EP1282099A2 (fr) * 2001-07-31 2003-02-05 Lg Electronics Inc. Appareil et méthode de commande pour un dispositif d'affichage luminescent
WO2003026285A2 (fr) * 2001-09-17 2003-03-27 Siemens Aktiengesellschaft Circuit de commande et procede d'adaptation d'une caracteristique de reproduction d'image d'un ecran plat
EP1361563A2 (fr) * 2002-05-08 2003-11-12 ATI Technologies Inc. Appareil portable avec un afficheur à cristaux liquides et retro-éclairage et sa méthode de configuration
WO2004008425A2 (fr) * 2002-07-16 2004-01-22 Sharp Kabushiki Kaisha Systeme d'affichage, procede de commande d'affichage, programme, et support d'enregistrement
WO2004055769A1 (fr) * 2002-12-13 2004-07-01 Koninklijke Philips Electronics N.V. Correction gamma automatique pour un affichage matriciel
EP1499918A1 (fr) * 2002-04-26 2005-01-26 Electronics and Telecommunications Research Institute Appareil et procede reduisant la consommation d'electricite en reglant le retroeclairage et en adaptant le signal visuel
WO2005029459A1 (fr) * 2003-09-15 2005-03-31 Intel Corporation Controle automatique de la luminance d'une image a reglage de l'eclairage de fond
EP1531453A2 (fr) * 2003-11-11 2005-05-18 Samsung Electronics Co., Ltd. Conservation d'énergie pour un dispositif d'affichage
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EP1713055A1 (fr) * 2003-11-19 2006-10-18 Eizo Nanao Corporation Procede de reglage de la luminance, afficheur a cristaux liquides, et programme informatique
EP1850316A1 (fr) * 2006-04-25 2007-10-31 ASUSTeK Computer Inc. Dispositif d'affichage capable de compenser la luminance d'environnements
EP1223570A3 (fr) * 2000-12-29 2007-11-07 Samsung Electronics Co. Ltd. Appareil et méthode de contrôle automatique de brillance de l'éclairage arrière à utiliser dans un affichage à cristaux liquides
US7348957B2 (en) 2003-02-14 2008-03-25 Intel Corporation Real-time dynamic design of liquid crystal display (LCD) panel power management through brightness control
US7477228B2 (en) 2003-12-22 2009-01-13 Intel Corporation Method and apparatus for characterizing and/or predicting display backlight response latency
CN100510856C (zh) * 2004-02-09 2009-07-08 株式会社日立显示器 液晶显示装置
CN101261813B (zh) * 2007-03-06 2010-05-26 明基电通股份有限公司 以插黑技术改善液晶显示器的显示方法
US7928955B1 (en) * 2000-03-13 2011-04-19 Intel Corporation Automatic brightness control for displays
US8358262B2 (en) 2004-06-30 2013-01-22 Intel Corporation Method and apparatus to synchronize backlight intensity changes with image luminance changes
US8648781B2 (en) 2007-06-26 2014-02-11 Apple Inc. Technique for adjusting a backlight during a brightness discontinuity
CN104700786A (zh) * 2014-12-26 2015-06-10 小米科技有限责任公司 显示亮度调整方法及装置
US9165493B2 (en) 2008-10-14 2015-10-20 Apple Inc. Color correction of electronic displays utilizing gain control
WO2016107267A1 (fr) * 2014-12-31 2016-07-07 小米科技有限责任公司 Procédé et dispositif de commande de rétroéclairage
WO2016112730A1 (fr) * 2015-01-15 2016-07-21 小米科技有限责任公司 Procédé et dispositif de réglage de la luminosité d'affichage
EP1717788B1 (fr) * 2005-04-28 2017-06-21 Samsung Display Co., Ltd. Dispositif d'affichage émettant de la lumière et sa méthode de commande

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JP4369837B2 (ja) * 2000-03-24 2009-11-25 シャープ株式会社 画像処理装置およびそれを備えた画像表示装置
JP3944204B2 (ja) * 2000-03-24 2007-07-11 シャープ株式会社 画像処理装置およびそれを備えた画像表示装置
JP2008083439A (ja) * 2006-09-28 2008-04-10 Sharp Corp 液晶表示装置及びホワイトバランス調整方法
JP2017182074A (ja) * 2017-04-28 2017-10-05 株式会社ニコン 表示装置、撮像装置およびプロジェクタ
JP2019110934A (ja) * 2017-12-20 2019-07-11 株式会社ユニバーサルエンターテインメント 遊技機
JP2019035988A (ja) * 2018-11-27 2019-03-07 株式会社ニコン 表示装置および撮像装置

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US9940902B2 (en) 2000-03-13 2018-04-10 Intel Corporation Automatic brightness control for displays
US7928955B1 (en) * 2000-03-13 2011-04-19 Intel Corporation Automatic brightness control for displays
US8466907B2 (en) 2000-03-13 2013-06-18 Intel Corporation Automatic brightness control for displays
US7002594B2 (en) 2000-03-24 2006-02-21 Sharp Kabushiki Kaisha Image processing apparatus and image display apparatus using same
EP1137266A3 (fr) * 2000-03-24 2003-12-03 Sharp Kabushiki Kaisha Appareil de traitement d'images et son utilisation dans un appareil d'affichage d'images
US7777759B2 (en) 2000-03-24 2010-08-17 Sharp Kabushiki Kaisha Image processing apparatus and image display apparatus using same
US7821522B2 (en) 2000-03-24 2010-10-26 Sharp Kabushiki Kaisha Image processing apparatus and image display apparatus using same
EP1137266A2 (fr) * 2000-03-24 2001-09-26 Sharp Kabushiki Kaisha Appareil de traitement d'images et son utilisation dans un appareil d'affichage d'images
EP1158484A2 (fr) * 2000-05-25 2001-11-28 Seiko Epson Corporation Traitement de données d'image fournies à un dispositif d'affichage
EP1158484A3 (fr) * 2000-05-25 2008-12-31 Seiko Epson Corporation Traitement de données d'image fournies à un dispositif d'affichage
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DE69740083D1 (de) 2011-02-03
EP0883103B1 (fr) 2010-12-22

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