WO2008001512A1 - Dispositif d'affichage d'images - Google Patents

Dispositif d'affichage d'images Download PDF

Info

Publication number
WO2008001512A1
WO2008001512A1 PCT/JP2007/053200 JP2007053200W WO2008001512A1 WO 2008001512 A1 WO2008001512 A1 WO 2008001512A1 JP 2007053200 W JP2007053200 W JP 2007053200W WO 2008001512 A1 WO2008001512 A1 WO 2008001512A1
Authority
WO
WIPO (PCT)
Prior art keywords
average value
luminance
light source
weighting
image display
Prior art date
Application number
PCT/JP2007/053200
Other languages
English (en)
Japanese (ja)
Inventor
Masayuki Takahashi
Yasukuni Yamane
Kazuhiro Uehara
Original Assignee
Sharp Kabushiki Kaisha
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 Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2008001512A1 publication Critical patent/WO2008001512A1/fr

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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/58—Arrangements comprising a monitoring photodetector
    • 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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the 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
    • 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
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • 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

Definitions

  • the histogram detection means divides the luminance information of the input video signal into a plurality of luminance information sections to detect the histogram distribution, and the weighting means detects the histogram detected by the histogram detection means. Weight the distribution. Then, the post-average value detecting means takes the average value of the results of the weighted histogram distribution and detects the post-average value.
  • ⁇ 22 A diagram showing a graph of the first arithmetic expression used by the backlight luminance determination unit in the above image display device to determine the backlight luminance, and shows the relationship between the previous average value and the backlight luminance. .
  • An image composed of half-screen all black 'all white' and a full-screen gray (50%) image have the same average luminance level (APL, the previous average value of the present invention described later). Therefore, APL cannot distinguish. However, the average value obtained after weighting the luminance information of the video signal in this way is different, and both images can be distinguished by the post-average value.
  • APL average luminance level
  • the brightness of the knocklight is set to 100% until the first predetermined value (in FIG. 5, the post-average value 30) reaches a predetermined first value from the post-average value 0.
  • the luminance is reduced from 100%, and the luminance is about 40% when the average value is 90 afterwards. And in the area where the rear average value exceeds 90, the luminance is almost constant at 40%.
  • the display control unit 14 outputs the video signal as the panel drive signal to the LCD panel 11 and outputs it to the rear average value detection unit 20.
  • the average value after detection is not used.
  • the knock light brightness determination unit 21 uses the relationship tables shown in FIGS. In the case of a configuration in which the brightness of the backlight 12 is reduced (lower than 100%) when the average value input from the average value detection unit 20 is equal to or lower than the second predetermined value, the brightness of the knock light 12 is reduced, The signal level may be corrected so that the signal level of the video signal is raised.
  • FIG. 12 is a block diagram showing a configuration of an image display device having a second premise configuration.
  • the present image display device further includes an illuminance sensor 23, and the detection output of the illuminance sensor 23 is input to the backlight luminance determination unit 21 of the knock light control unit 13. It has become.
  • the knock light control unit 13 replaces the knock light luminance determination unit 21 with a backlight. Only the point provided with the luminance determination unit 21 ′ is different from the backlight control unit 13 described above.
  • FIG. 19 is a block diagram showing a configuration of an image display device having a fourth premise configuration. As shown in the figure, this image display apparatus is different from the image display apparatus of the third premise configuration only in that an illuminance sensor 23 is newly provided. The detection output of the illuminance sensor 23 is input to the backlight luminance determination unit 21 of the knock light control unit 13 as described in the second premise configuration.
  • FIGS. 1 to 4 An image display apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
  • members having the same functions as those used in the description of the first to fourth premise configurations described above are denoted by the same reference numerals and description thereof is omitted.
  • the pre-average value detection unit 15 is different from the post-average value detection unit 20 in terms of the average value.
  • the post-average value detection unit 20 includes the luminance information and the condition of the video signal after being weighted by the weighting unit 19. Specifically, the weighted signal level is accumulated in units of frames, and the average value per frame is detected as the post-average value.
  • the previous average value detection unit 15 accumulates the signal level, which is the luminance information of the video signal before entering the weighting unit 19, in units of frames to obtain the average value per frame, that is, the average signal level (APL). It is to detect. As with the post-average value, APL is expressed by values from 1 to: LOO. Then, the APL detected by the previous average value detection unit 15 is sent to the backlight luminance determination unit 30.
  • the APL detected by the previous average value detection unit 15 is referred to as the previous average value in the sense of the average value before weighting.
  • K l. 5 ⁇ -50 (Video signal level> 50%)
  • the backlight luminance determining unit 30 determines the luminance of the knocklight 12 based on the post-average value input from the post-average value detection unit 20 and the pre-average value input from the pre-average value detection unit 15. In determining the above, the detection output input from the illuminance sensor 23 is taken into account. Only this point is different from the backlight luminance determining unit 30 described above.
  • the first image display device includes a light source and a light modulation element that changes the brightness of a display image by dimming the light having the light source power according to the video signal. And a light source control means for correcting the luminance of the light source, wherein the weighting means weights the luminance information of the input video signal, and is weighted by the weighting means. Averages the luminance information before each frame, detects the average value for one frame, and averages the luminance information weighted by the above weighting unit for each frame.
  • a weighted average value detecting means for detecting an average value for the frame, and the light source control means includes a pre-weighted average value detected by the pre-weighted average value detecting means and a weighted average value detecting means.
  • Detected weight It is characterized by performing the brightness correction for the light source based on the average value after after only with.
  • the average value before weighting that is, the pre-average value which is APL
  • the average value pre-weighting detection means in which the post-average value is not used as it is.
  • the light source control means detects the value and corrects the luminance of the light source based on the pre-average value and the weighted post-average value. It is possible to further effectively control the brightness according to the characteristics of the image by distinguishing the fine images.

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)

Abstract

Une unité de pondération (19) réalise une pondération pour une information de luminosité d'un signal vidéo d'entrée et une seconde unité de détection de valeur moyenne (16) détecte une valeur moyenne postérieure qui est une valeur moyenne pour chaque trame de l'information de luminosité pondérée. Une unité de détection de valeur moyen antérieure (16) détecte une valeur moyenne antérieure qui est une moyenne pour chaque trame de l'information de luminosité antérieure à la pondération. Une unité de détermination de luminosité de projecteur de fond (30) détermine la luminosité d'un projecteur de fond (12) en fonction de la valeur moyenne antérieure et de la valeur moyenne postérieure comme paramètres. Étant donné que le même contrôle a été appliqué dans le contrôle de luminosité à l'aide d'une valeur moyenne antérieure, une telle image est distincte de sorte qu'elle présente un ajustement de luminosité précis.
PCT/JP2007/053200 2006-06-28 2007-02-21 Dispositif d'affichage d'images WO2008001512A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-178520 2006-06-28
JP2006178520 2006-06-28

Publications (1)

Publication Number Publication Date
WO2008001512A1 true WO2008001512A1 (fr) 2008-01-03

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Application Number Title Priority Date Filing Date
PCT/JP2007/053200 WO2008001512A1 (fr) 2006-06-28 2007-02-21 Dispositif d'affichage d'images

Country Status (1)

Country Link
WO (1) WO2008001512A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010122725A1 (fr) * 2009-04-24 2010-10-28 パナソニック株式会社 Dispositif d'affichage et procédé de commande d'affichage
WO2011111268A1 (fr) * 2010-03-12 2011-09-15 シャープ株式会社 Dispositif d'affichage d'image et procédé d'affichage d'image
JP4991949B1 (ja) * 2011-04-07 2012-08-08 シャープ株式会社 映像表示装置およびテレビ受信装置
WO2013069332A1 (fr) * 2011-11-11 2013-05-16 シャープ株式会社 Dispositif d'affichage d'image et dispositif de réception de télévision
WO2013114643A1 (fr) * 2012-01-31 2013-08-08 シャープ株式会社 Dispositif d'affichage vidéo et récepteur de télévision
JP2013161092A (ja) * 2013-03-05 2013-08-19 Sharp Corp 映像表示装置およびテレビ受信装置
JP2014052549A (ja) * 2012-09-07 2014-03-20 Sharp Corp 画像表示装置、画像表示装置の制御方法、制御プログラムおよび記録媒体

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004326082A (ja) * 2003-04-09 2004-11-18 Matsushita Electric Ind Co Ltd 表示制御装置及び表示装置
JP2007011350A (ja) * 2005-06-30 2007-01-18 Lg Phillips Lcd Co Ltd 液晶表示装置の駆動装置及び駆動方法
WO2007029420A1 (fr) * 2005-09-08 2007-03-15 Sharp Kabushiki Kaisha Dispositif d’affichage d’image

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004326082A (ja) * 2003-04-09 2004-11-18 Matsushita Electric Ind Co Ltd 表示制御装置及び表示装置
JP2007011350A (ja) * 2005-06-30 2007-01-18 Lg Phillips Lcd Co Ltd 液晶表示装置の駆動装置及び駆動方法
WO2007029420A1 (fr) * 2005-09-08 2007-03-15 Sharp Kabushiki Kaisha Dispositif d’affichage d’image

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010122725A1 (fr) * 2009-04-24 2010-10-28 パナソニック株式会社 Dispositif d'affichage et procédé de commande d'affichage
US8933975B2 (en) 2009-04-24 2015-01-13 Panasonic Intellectual Property Management Co., Ltd. Display device and display control method
CN102763155B (zh) * 2010-03-12 2015-01-07 夏普株式会社 图像显示装置和图像显示方法
WO2011111268A1 (fr) * 2010-03-12 2011-09-15 シャープ株式会社 Dispositif d'affichage d'image et procédé d'affichage d'image
CN102763155A (zh) * 2010-03-12 2012-10-31 夏普株式会社 图像显示装置和图像显示方法
US9361835B2 (en) 2010-03-12 2016-06-07 Sharp Kabushiki Kaisha Image display device and image display method
JP4991949B1 (ja) * 2011-04-07 2012-08-08 シャープ株式会社 映像表示装置およびテレビ受信装置
WO2012137388A1 (fr) * 2011-04-07 2012-10-11 シャープ株式会社 Dispositif d'affichage vidéo et dispositif de réception de télévision
JP2013104947A (ja) * 2011-11-11 2013-05-30 Sharp Corp 映像表示装置およびテレビ受信装置
WO2013069332A1 (fr) * 2011-11-11 2013-05-16 シャープ株式会社 Dispositif d'affichage d'image et dispositif de réception de télévision
JP2013156484A (ja) * 2012-01-31 2013-08-15 Sharp Corp 映像表示装置およびテレビ受信装置
WO2013114643A1 (fr) * 2012-01-31 2013-08-08 シャープ株式会社 Dispositif d'affichage vidéo et récepteur de télévision
JP2014052549A (ja) * 2012-09-07 2014-03-20 Sharp Corp 画像表示装置、画像表示装置の制御方法、制御プログラムおよび記録媒体
JP2013161092A (ja) * 2013-03-05 2013-08-19 Sharp Corp 映像表示装置およびテレビ受信装置

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