WO2009138965A1 - Barres ultra noires dans une télévision à affichage à cristaux liquides - Google Patents

Barres ultra noires dans une télévision à affichage à cristaux liquides Download PDF

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Publication number
WO2009138965A1
WO2009138965A1 PCT/IB2009/052026 IB2009052026W WO2009138965A1 WO 2009138965 A1 WO2009138965 A1 WO 2009138965A1 IB 2009052026 W IB2009052026 W IB 2009052026W WO 2009138965 A1 WO2009138965 A1 WO 2009138965A1
Authority
WO
WIPO (PCT)
Prior art keywords
display device
display
backlights
section
interlacer
Prior art date
Application number
PCT/IB2009/052026
Other languages
English (en)
Inventor
Han Joosten
Original Assignee
Nxp B.V.
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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009138965A1 publication Critical patent/WO2009138965A1/fr

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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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0232—Special driving of display border areas
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • 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
    • G09G2320/0613—The adjustment depending on the type of the information to be displayed
    • G09G2320/062—Adjustment of illumination source parameters

Definitions

  • Black bars appear on the upper and lower viewing sections of a television (TV) screen when the aspect ratio of an input video signal does not match the inherent aspect ratio of the TV screen.
  • the aspect ratio of a standard definition TV is 4:3, the aspect ratio of a high-definition TV is 16:9, and the typical movie cinema aspect ratio is 22:9.
  • a standard definition 4:3 source may be displayed on a high- definition 16:9 TV by transforming the source to 14:9, and so forth.
  • transforming the source aspect ratio to better fit the inherent aspect ratio of a TV screen often still leaves black bars on the top and bottom of the TV screen.
  • Fig. IA depicts a conventional standard-definition LCD TV 102.
  • Fig. IB depicts a conventional high-definition LCD TV 104.
  • the standard- definition and high-definition LCD TVs 102 and 104 include viewing areas 110 and 116, respectively, to display video content.
  • the viewing area 110 of the standard-definition LCD TV 102 includes upper and lower black bars 106 and 108.
  • the viewing area 116 of the high-definition LCD TV 104 includes upper and lower black bars 112 and 114.
  • the standard- definition and high-definition LCD TVs 102 and 104 display "grey" bars because of the use of backlight illumination.
  • the backlighting includes multiple illumination devices.
  • CCFLs cold-cathode fluorescent lamps
  • the CCFLs are typically mounted horizontally behind the display.
  • the number of individual CCFLs implemented increases as the size of the LCD panel increases.
  • An average LCD panel contains between 8 and 10 individual CCFLs, mounted horizontally behind the display.
  • the use of backlights in LCD TVs prevents the black bar areas from appearing to be black because of light leakage through the liquid crystals.
  • the liquid crystals of the display operate to control the transparency depending on the video content. If an image is black, then the optimum situation is no light throughput, and if white, then full transparency with maximum light output. This is controlled on a per pixel basis in the LCD panel for the 3 primary colors, red, green and blue. In the black bar areas, the transmission of light is not typically zero, and so the perceived color is grey rather than black. Thus, in typical TV room conditions, the black bars appear as grey instead of black. Grey bars on the upper and lower viewing sections of an LCD screen reduce the perception of picture quality for LCD TV's.
  • the system is a liquid crystal display (LCD) system to improve an image quality of video content displayed on an LCD TV.
  • the LCD system includes a backlight, a content detector, and an image controller.
  • the backlight includes a section of upper backlights, a section of lower backlights, and a section of intermediate backlights.
  • the content detector detects video content in an input signal from a video source.
  • the image controller receives an input video signal from the video source and processes the input video signal to generate a processed video signal for display on the display device.
  • the image controller also designates upper, lower, and intermediate display sections of the display device.
  • the image controller also includes a sealer de-interlacer.
  • the sealer de-interlacer controls a backlight inverter to adjust illumination levels of the upper and lower backlights in response to detection of an absence of video content in the corresponding upper and lower display sections of the display device to adjust an image quality in the intermediate display section of the display device.
  • a backlight inverter to adjust illumination levels of the upper and lower backlights in response to detection of an absence of video content in the corresponding upper and lower display sections of the display device to adjust an image quality in the intermediate display section of the display device.
  • the apparatus is an image controller to receive an input video signal from a video source.
  • the image controller includes a digital processor, a content detector, and a sealer de-interlacer.
  • the digital processor processes the input video signal to generate a processed video signal for display on the display device.
  • the content detector detects video content in the input video signal.
  • the sealer de-interlacer controls a backlight inverter to adjust illumination levels of upper and lower backlights in response to detection of an absence of video content in corresponding upper and lower display sections of the display device to adjust an image quality in an intermediate display section of the display device.
  • Other embodiments of the apparatus are also described.
  • Embodiments of a method are also described.
  • the method is a method for controlling backlights in an LCD panel.
  • the method includes generating a processed video signal from an input video signal for display on a display device.
  • the display device includes upper, lower, and intermediate display sections.
  • the method also includes displaying video content for the processed video signal on the intermediate display section of the display device.
  • the method also includes adjusting backlight illumination levels of the upper and lower display sections of the display device in response to an absence of video content in the upper and lower display sections of the display device to adjust an image quality of the processed video content on the intermediate display section of the display device.
  • Other embodiments of the method are also described.
  • Fig. IA depicts a conventional standard-definition television.
  • Fig. IB depicts a conventional high-definition television.
  • Fig. 2 depicts a schematic block diagram of one embodiment of a video display system.
  • Fig. 3 depicts a schematic block diagram of one embodiment of the image controller and the display device of the video display system of Fig. 2.
  • Fig. 4 depicts a schematic flow chart diagram of one embodiment of a backlight control method for controlling upper and lower backlights of the display device of Fig. 3.
  • Fig. 5 depicts a schematic flow chart diagram of one embodiment of a backlight dimming method for dimming the upper and lower backlights of the display device of Fig. 3.
  • the described embodiments facilitate displaying an improved picture quality on an LCD TV while displaying black bars in the upper and lower viewing areas, or display sections, of the LCD screen.
  • the upper and lower backlights are turned off to display darker black bars in the upper and lower viewing areas of the LCD screen.
  • the upper and/or lower backlights are dimmed to display a subtitle in the upper and/or lower viewing areas of the LCD screen, while improving the image quality of video content displayed on the LCD viewing area.
  • the perceived picture quality of the video content displayed between the black bars can be improved even when subtitles are displayed on the LCD panel.
  • FIG. 2 depicts a schematic block diagram of one embodiment of a video display system 150.
  • the illustrated video display system 150 includes a video source 152, an image controller 154, and a display device 156.
  • the depicted video display system 150 includes several functional blocks described herein, other embodiments of the video display system 150 may include fewer or more functional blocks to implement more or less functionality.
  • the video source 152 generates a video signal.
  • the video signal generated by the video source 152 includes video content that is processed by the image controller 154 and displayed on the display device 156.
  • video content includes images and moving images.
  • the video signal generated by the video source 152 may supply other content that is not video content.
  • One example of content supplied by the video source 152 that is not video content is a subtitle.
  • the video source 152 may include digital video from a digital video disk (DVD) playing on a DVD player, digital video from a camcorder, digital video from a digital camera, a digital video file stored on a media player, and so on.
  • the video source 152 may also include analog video such as a video home system (VHS) cassette playing on a VHS player or an analog video from an analog camcorder.
  • VHS video home system
  • the image controller 154 receives the video from the video source 152 and processes the video for display on the display device 156.
  • One example of the image controller 154 is shown in Fig. 3 and described in more detail below.
  • the display device 156 includes an LCD panel or another type of display device used to display a video source 152.
  • the display device 156 may include a television LCD panel, a computer monitor LCD panel, an LCD panel of a mobile multimedia device, and so on.
  • One example of the display device 156 is shown in Fig.3 and described in more detail below.
  • Fig. 3 depicts a schematic block diagram of one embodiment of the image controller 154 and the display device 156 of the video display system of Fig. 2.
  • the illustrated image controller 154 includes a content detector 160, a sealer de- interlacer 162, a processor 164, a memory device 166, and at least one bus interface 158. Additionally, the memory device 166 includes a lookup table 168.
  • the illustrated display device 156 includes a backlight inverter 170 and a backlight 172. In one embodiment, the display device 156 is subdivided into upper, intermediate, and lower viewing areas 174, 176, and 178, respectively. Other embodiment may use fewer or more areas.
  • the illustrated backlight 172 includes upper, intermediate, and lower backlights 180, 182, and 184, respectively. Other embodiments of the backlight 172 may include fewer or more sections of backlights. In some embodiments, the backlight sections 180, 182, and 184 correspond to the viewing areas 172, 176, and 178 of the display device 156. Although the depicted image controller 154 includes several functional blocks described herein, other embodiments of the image controller 154 may include fewer or more functional blocks to implement more or less functionality. In one embodiment, the image controller 154 processes an input video signal supplied by the video source 152. The image controller 154 then sends the processed video signal for viewing on the display device 156.
  • the image controller 154 designates boundaries for the upper, intermediate, and lower viewing areas 174, 176, and 178, respectively, of the display device 156.
  • the content detector 160 detects video content for display in one or more of the upper, intermediate, and lower viewing areas 174, 176, and 178, respectively, of the display device 156.
  • the content detector 160 detects the type of video content supplied by the video source 152. Examples of types of video content include a TV broadcast video source, a DVD video source, and so on.
  • the content detector 160 detects the aspect ratio associated with the video content supplied by the video source 152.
  • the content detector 160 detects a subtitle in the upper viewing area 174 and/or the lower viewing area 178 of the display device 156.
  • the content detector 160 also may detect an absence of content in one or more of the viewing areas 174, 176, and 178.
  • the sealer de-interlacer 162 scales a video signal from the video source 152 according to the native resolution of the display device 156.
  • the sealer de-interlacer 162 may also de-interlace an interlaced video signal from the video source 152 according to the progressive scanning of the display device 156.
  • the resolution of the video signal from the video source 152 matches the native resolution of the display device 156 and the scaling function of the sealer de-interlacer 162 may be bypassed.
  • the video signal from the video source 152 is a progressive scanned video signal and the de-interlacing function of the sealer de-interlacer 162 may be bypassed.
  • the sealer de-interlacer 162 adjusts illumination levels of the upper and lower backlights 180 and 184 in response to detection of an absence of video content in the corresponding upper and lower display sections of the display device 156 by the content detector 160. In some embodiments, the sealer de-interlacer 162 controls the backlight inverter 170 to disable the upper and/or lower backlights 180 and 184. In one embodiment, the sealer de-interlacer 162 controls the backlight inverter 170 to dim the upper and/or lower backlights 180 and 184. In some embodiments, the sealer de-interlacer 162 dims the upper and/or lower backlights 180 and 184 in response to the detection of a subtitle in the corresponding upper and/or lower viewing areas 174 and 178.
  • the sealer de-interlacer 162 controls the backlight inverter 170 in conjunction with the processor 164.
  • the processor 164 processes a backlight disable command.
  • the processor 164 processes a backlight dim command.
  • the memory device 166 stores a lookup table 168.
  • a lookup table 168 stores backlight illumination levels associated with video content detected by the content detector 160.
  • the sealer de-interlacer 162 is further configured to dim the upper and lower backlights 180 and 184 according to a backlight illumination levels associated with a detected subtitle and stored in the lookup table 168.
  • the display device 156 displays the video content processed by the image controller 154.
  • the display device 156 displays relatively darker black bars in the upper and lower viewing areas 174 and 178 in response to the sealer de-interlacer 162 dimming or disabling the upper and/or lower backlights 180 and 184, compared to when the upper and lower backlights 180 and 184 are fully enabled.
  • the display device 156 displays an improved image quality (i.e., the perceived image quality) in the intermediate viewing area 176 of the display device 156, relative to the image quality of the intermediate viewing area 176 when the upper and lower backlights 180 and 184 are enabled.
  • the display device 156 displays subtitles in the upper and lower viewing areas 174 and 178 in response to the content detector 160 detecting a subtitle in the upper viewing area 174 and/or the lower viewing area 178 of the display device 172.
  • the display device 156 displays relatively darker black bars in the upper and lower viewing areas 174 and 178 while displaying a subtitle in the upper viewing area 174 when the sealer de- interlacer 162 dims the upper backlight 180 and disables the lower backlight 184 in response to the content detector 160 detecting subtitles in the upper viewing area 174 of the display device 172.
  • the display device 156 displays relatively darker black bars in the upper and lower viewing areas 174 and 178 while displaying a subtitle in the lower viewing area 178 when the sealer de-interlacer 162 dims the lower backlight 184 and disables the upper backlight 180 in response to the content detector 160 detecting subtitles in the lower viewing area 178 of the display device 172.
  • the backlight 172 includes cold-cathode fluorescent lamps (CCFLs).
  • the backlight 172 includes light emitting diodes (LEDs).
  • the bus interface 158 facilitates communications between the image controller 154 and the display device 156.
  • Fig. 4 depicts a schematic flow chart diagram of one embodiment of a backlight control method 200 for controlling upper and lower backlights 180 and 184 of the display device 156 of Fig. 3.
  • the backlight control method 200 is described in conjunction with the video display system 150 of Fig. 2 and components thereof, other embodiments of the backlight control method 200 may be implemented with other video display systems and/or other video display system components.
  • the image controller 154 receives an input video signal from the video source 152.
  • the content detector 160 determines whether the input video signal supplied by the video source 152 includes video content in the upper and lower viewing areas 174 and 178 of the display device 156.
  • the sealer de-interlacer 162 disables the upper and/or lower backlights 180 and
  • Fig. 5 depicts a schematic flow chart diagram of one embodiment of a backlight dimming method 300 for dimming the upper and lower backlights 180 and 184 of the display device 156 of Fig. 3.
  • the backlight dimming method 300 is described in conjunction with the video display system 150 of Fig. 2 and components thereof, other embodiments of the backlight dimming method 300 may be implemented with other video display systems and/or other video display system components. As depicted, some of the operations of the backlight dimming method 300 are substantially similar to the operations of the backlight control method 200, except as described below.
  • the content detector 160 determines whether the input video signal supplied by the video source 152 includes subtitles in the upper and/or lower viewing areas 174 and 178 of the display device 156.
  • the sealer de-interlacer 162 disables the upper and/or lower backlights 180 and 184 accordingly.
  • the sealer de-interlacer 162 disables and dims the upper and/or lower backlights 180 and 184 accordingly.
  • the sealer de-interlacer 162 dims the lower backlight 184 and disables the upper backlight 180, accordingly.
  • the image quality of the video content displayed on the intermediate viewing area 176 of the display device 156 is improved while still displaying a subtitle in the lower viewing area 178.
  • backlight control method 200 and the backlight dimming method 300 may implement fewer or more operations.
  • some embodiments of the backlight control method 200 and the backlight dimming method 300 facilitate implementation of any of the functions described in relation to the video display system 150 or any of the components thereof.
  • Some embodiments of the backlight disabling schemes of the sealer de-interlacer 162 substantially improve the image quality of the video content displayed on the display device 156, relative to the same video content displayed on the display device 156 with all of the backlights enabled.
  • embodiments described herein improve the image quality of the video content through the backlight dimming scheme of the sealer de-interlacer 162, compared to displaying subtitles with the upper and lower backlights 180 and 184 enabled without any dimming.
  • embodiments of the backlight disabling and dimming schemes improve the image quality of video content displayed on the display device 156 with and without subtitles in the video content.
  • At least some of the operations for the backlight control method 200, the backlight dimming method 300, and the video display system 150 may be implemented using software instructions stored on a computer useable storage medium for execution by a computer.
  • an embodiment of a computer program product includes a computer useable storage medium to store a computer readable program that, when executed on a computer, causes the computer to perform operations, as described above.
  • Embodiments of the invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment containing both hardware and software elements.
  • the invention is implemented in software, which includes but is not limited to firmware, resident software, microcode, etc.
  • embodiments of the invention can take the form of a computer program product accessible from a computer-usable or computer- readable storage medium providing program code for use by or in connection with a computer or any instruction execution system.
  • a computer-usable or computer readable storage medium can be any apparatus that can store the program for use by or in connection with the instruction execution system, apparatus, or device.
  • the computer-useable or computer-readable storage medium can be an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system (or apparatus or device), or a propagation medium.
  • Examples of a computer- readable storage medium include a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a random access memory (RAM), a read-only memory (ROM), a rigid magnetic disk, and an optical disk.
  • Current examples of optical disks include a compact disk with read only memory (CD- ROM), a compact disk with read/write (CD-RTW), a digital video disk (DVD), and high-definition (HD) disks such as Blu-Ray and HD-DVD.
  • An embodiment of a data processing system suitable for storing and/or executing program code includes at least one processor coupled directly or indirectly to memory elements through a system bus such as a data, address, and/or control bus.
  • the memory elements can include local memory employed during actual execution of the program code, bulk storage, and cache memories which provide temporary storage of at least some program code in order to reduce the number of times code must be retrieved from bulk storage during execution.

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  • 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

L'invention porte sur un système d'affichage à cristaux liquides (LCD) pour améliorer la qualité d'image d'un contenu vidéo. Le système d'affichage à cristaux liquides comprend un rétroéclairage, qui comprend des sections de rétroéclairage supérieure, inférieure et intermédiaire, et un dispositif de commande d'image, qui comprend un détecteur de contenu et un désentrelaceur scellant. Le dispositif de commande d'image reçoit un signal vidéo d'entrée à partir d'une source vidéo et génère un signal vidéo traité pour l'affichage sur un dispositif d'affichage. Le dispositif de commande d'image désigne également les sections d'affichage supérieur, inférieur et intermédiaire du dispositif d'affichage. Le détecteur de contenu détecte un contenu vidéo dans le signal vidéo d'entrée provenant de la source vidéo. Le désentrelaceur scellant commande un onduleur de rétroéclairage afin d'ajuster les niveaux d'éclairage des rétroéclairages supérieur et inférieur en réponse à la détection d'une absence de contenu vidéo dans les sections supérieure et inférieure correspondantes du dispositif d'affichage de façon à ajuster la qualité d'image dans la section d'affichage intermédiaire du dispositif d'affichage.
PCT/IB2009/052026 2008-05-16 2009-05-15 Barres ultra noires dans une télévision à affichage à cristaux liquides WO2009138965A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5407108P 2008-05-16 2008-05-16
US61/054,071 2008-05-16

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WO2009138965A1 true WO2009138965A1 (fr) 2009-11-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3217386A1 (fr) * 2016-03-08 2017-09-13 Funai Electric Co., Ltd. Afficheur
EP3499493A1 (fr) * 2017-12-15 2019-06-19 Vestel Elektronik Sanayi ve Ticaret A.S. Dispositif d'affichage et procédé d'affichage d'images

Citations (5)

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Publication number Priority date Publication date Assignee Title
US20030169247A1 (en) * 2002-03-07 2003-09-11 Kazuyoshi Kawabe Display device having improved drive circuit and method of driving same
EP1622343A2 (fr) * 2004-07-26 2006-02-01 Nec Corporation Terminal portatif de communication radio
WO2006070323A1 (fr) * 2004-12-27 2006-07-06 Koninklijke Philips Electronics N.V. Balayage de retroeclairage pour lcd
WO2007031915A2 (fr) * 2005-09-13 2007-03-22 Koninklijke Philips Electronics N.V. Dispositifs d'affichage electrophoretiques
DE102005059765A1 (de) * 2005-12-14 2007-06-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Anzeigevorrichtung mit einer Vielzahl von Bildpunkten und Verfahren zum Anzeigen von Bildern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030169247A1 (en) * 2002-03-07 2003-09-11 Kazuyoshi Kawabe Display device having improved drive circuit and method of driving same
EP1622343A2 (fr) * 2004-07-26 2006-02-01 Nec Corporation Terminal portatif de communication radio
WO2006070323A1 (fr) * 2004-12-27 2006-07-06 Koninklijke Philips Electronics N.V. Balayage de retroeclairage pour lcd
WO2007031915A2 (fr) * 2005-09-13 2007-03-22 Koninklijke Philips Electronics N.V. Dispositifs d'affichage electrophoretiques
DE102005059765A1 (de) * 2005-12-14 2007-06-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Anzeigevorrichtung mit einer Vielzahl von Bildpunkten und Verfahren zum Anzeigen von Bildern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3217386A1 (fr) * 2016-03-08 2017-09-13 Funai Electric Co., Ltd. Afficheur
CN107170422A (zh) * 2016-03-08 2017-09-15 船井电机株式会社 显示装置
EP3499493A1 (fr) * 2017-12-15 2019-06-19 Vestel Elektronik Sanayi ve Ticaret A.S. Dispositif d'affichage et procédé d'affichage d'images

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