DE10354238A1 - Energy-saving circuit for flat display devices illuminated from behind, has sources of light shaped as bars and spots arranged in a reflective casing behind the display - Google Patents
Energy-saving circuit for flat display devices illuminated from behind, has sources of light shaped as bars and spots arranged in a reflective casing behind the display Download PDFInfo
- Publication number
- DE10354238A1 DE10354238A1 DE10354238A DE10354238A DE10354238A1 DE 10354238 A1 DE10354238 A1 DE 10354238A1 DE 10354238 A DE10354238 A DE 10354238A DE 10354238 A DE10354238 A DE 10354238A DE 10354238 A1 DE10354238 A1 DE 10354238A1
- Authority
- DE
- Germany
- Prior art keywords
- display
- lamps
- behind
- saving circuit
- energy saving
- 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.)
- Withdrawn
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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
- 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
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- 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
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0442—Handling or displaying different aspect ratios, or changing the aspect ratio
-
- 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
- G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel
Abstract
Description
Die Erfindung betrifft eine Energiesparschaltung für Flachdisplaygeräte mit hinterleuchtetem Display, aufweisend eine Vielzahl stab- oder punktförmiger Lichtquellen, die hinter dem Display in einem Reflexionsgehäuse angeordnet und beim Anschalten des Displays an eine Stromversorgungsquelle anschließbar sind.The The invention relates to a power saving circuit for flat panel display devices with backlit Display comprising a plurality of rod or point light sources, located behind the display in a reflection housing and when turning on the Displays can be connected to a power source.
LCD- und TFT-Displays sind bekanntlich hinterleuchtet, wobei die Lichtstärke die Helligkeit des auf dem LCD- oder TFT-Display dargestellten Bildes bestimmt. Es gibt auch LCD-Displays, die nicht hinterleuchtet sind. Diese sind nicht Gegenstand der vorliegenden Erfindung.LCD and TFT displays are known backlit, the light intensity of the Brightness of the image displayed on the LCD or TFT display. There are also LCD displays that are not backlit. These are not the subject of the present invention.
Zum Zwecke der Hinterleuchtung ist hinter den Displays ein Gehäuse vorgesehen, in dem stabförmige Lampen angeordnet sind, die sich bei den bekannten Bauausführungen über die gesamte Breite oder über Teile der Breite des Displays erstrecken. Zukünftig werden anstelle der Lampen auch LEDs eingesetzt werden, die dann über die Fläche verteilt angeordnet werden. Die Rückwand dieses Gehäuses ist als Reflektor ausgebildet, um eine gleichmäßige Lichtverteilung sicherzustellen. Vor den Leuchtkörpern befindet sich eine Diffusionsscheibe, ggf. noch eine zweite, um eine diffuse rückseitige Beleuchtung des LCD- oder TFT-Displays zu gewährleisten, das davor angeordnet ist. Des weiteren befinden sich zwischen den Diffusionsscheiben und dem Display eine Prismenschicht und eine Reflexionsschicht. Der Verbund wird zusammengehalten durch einen umlaufenden Rahmen, auf den das LCD- oder TFT-Display aufgesetzt ist. Bei bekannten 17" Displays sind z.B. sieben Stablampen vorgesehen, die in seitlichen Lampenhaltern befestigt und über eine gemeinsame Zuleitung an die Stromversorgungsquelle des Flachdisplaygerätes angeschlossen sind.To the For purposes of backlighting, a housing is provided behind the displays, in the rod-shaped Lamps are arranged, which in the known Bauausführungen over the entire width or over Parts of the width of the display extend. In the future, instead of the lamps LEDs are also used, which are then distributed over the surface. The back wall this case is designed as a reflector to ensure a uniform distribution of light. In front of the luminaries there is a diffusion disk, possibly a second, to a diffuse back To ensure illumination of the LCD or TFT displays arranged in front of it is. Furthermore, there are between the diffusion discs and the display a prism layer and a reflective layer. The composite is held together by a surrounding frame, on which the LCD or TFT display is mounted. At acquaintances 17 "displays are e.g. seven flashlights provided in side lamp holders attached and over a common cable connected to the power source of the flat panel display device are.
Die zum Einsatz kommenden Lampen haben einen hohen Energieverbrauch. Jede Lampe besitzt beispielsweise eine Leistung von 20 W, so dass die gesamte Leistung bei sieben Lampen 140W beträgt. Dies gilt gleichermaßen auch für Anordnungen mit anderer Lampenanzahl. LEDs sind zwar wesentlich energieärmer, dafür müssen diese in größeren Stückzahlen angeordnet werden.The used lamps have a high energy consumption. For example, each lamp has a power of 20 W, so that the total power at seven lamps is 140W. This is equally true for orders with a different number of lamps. LEDs are much less energy, but they have to in larger quantities to be ordered.
Oftmals werden die Displays nicht für die Vollbilddarstellung benötigt. Z.B. werden nur im unteren Drittel des Bildschirms Benutzerführungen oder Infoanzeigen dargestellt, während der Rest des Bildschirms durch entsprechende Ansteuerung des Displays dunkelgetastet ist. Dies ist beispielsweise auch gegeben, wenn das Display in einem Sichtschirmtelefon eingebaut ist und nur die Funktionstastenanzeige eingeblendet wird.often the displays are not for the full screen view needed. For example, only in the lower third of the screen user guides or info displays presented while the rest of the screen by appropriate control of the display is dark-tasted. This is for example also given if the Display is built into a screen phone and only the function key display is displayed.
Der Erfindung liegt die Aufgabe zugrunde, den Energieverbrauch eines Flachdisplaygerätes wesentlich zu reduzieren.Of the Invention is based on the object, the energy consumption of Flat-panel display essential to reduce.
Gelöst wird die Aufgabe durch Integration einer Energiesparschaltung gemäß der im Anspruch 1 angegebenen Lehre.Is solved the task by integrating a power saving circuit according to the Claim 1 teaching.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.advantageous Further developments of the invention are specified in the subclaims.
Die Erfindung macht sich die Tatsache zunutze, dass für die Hinterleuchtung mehrere Lampen verwendet werden, und teilt die Stromversorgung der Lampen gemäß einer Sternform auf, so dass jede Lampe einzeln ansteuerbar ist. In Abhängigkeit von den darzustellenden Bildinformationen und der damit belegten Displayteilfläche werden nicht benötigte Lampen einfach abgeschaltet. Die Auswerteschaltung ermittelt anhand der Bildinformationen den Flächenbedarf der aktiven Darstellungsfläche und steuert über eine Schalteranordnung die einzelnen Lampen aktiv oder passiv. Zweckmäßigerweise wird hierfür ein Mikroprozessor verwendet, der mittels ROM-resistentem Programm die Bildinhalte des in einem Bildspeicher zwischengespeicherten Bildes und den Flächenbedarf und die Positionierung ermittelt. Davon abgeleitet werden dann die benachbarten nicht benötigten Lampen abgeschaltet. Die Auswerteschaltung kann dabei auch Betriebsmodi berücksichtigen. Befindet sich das Displaygerät beispielsweise im Modus Fernsehbildwiedergabe, so erfolgt keine Stromabschaltung einzelner Lampen, da in diesem Betriebsmodus normalerweise die gesamte Bildfläche für die Bilddarstellung genutzt wird. Handelt es sich hingegen um die Darstellung eines Fernsehbildes im 16:9 Format auf einem 4:3 Display, so kann die Auswerteschaltung abhängig von der verkleinerten Vertikalen des Bildinhaltes gegenüber der Displayhöhe nicht benötigte Lampen im Schwarzbereich des Bildes abschalten, so dass auch bei diesem Fernsehbetrieb Energie gespart wird. Befindet sich das Gerät im Onscreen-Betrieb (OSD) und werden nur Teilbereiche des Bildschirms für die Darstellung von Funktionen genutzt, so werden von der Auswerteschaltung die Lampen, die sich hinter den nicht benötigten Displayflächen befinden, abgeschaltet.The Invention makes use of the fact that for backlighting several lamps are used, and shares the power of the lamps according to a Star shape, so that each lamp is individually controllable. Dependent on from the image information to be displayed and the information thus assigned Display subarea become unnecessary lamps simply shut off. The evaluation circuit is determined on the basis of Image information the area requirement the active display area and controls over a switch arrangement the individual lamps active or passive. Conveniently, will do this a microprocessor used by means of ROM-resistant program the image contents of the cached in a frame memory Picture and the space requirement and the positioning is determined. Derived from this then the neighboring unneeded Lamps shut off. The evaluation circuit can also operate modes consider. Is the display device For example, in the mode of TV picture playback, so there is none Power cut off individual lamps, as in this mode of operation normally the entire picture surface for the Image representation is used. On the other hand, is it the presentation? a TV picture in 16: 9 format on a 4: 3 display, so can the evaluation circuit dependent from the reduced vertical of the image content compared to the display height not needed Turn off lights in the black area of the picture, so that too This TV company saves energy. Is the device in on-screen mode? (OSD) and are only part of the screen for the presentation of Functions are used, the evaluation circuit switches the lamps, who are behind the unneeded display surfaces are switched off.
Die Erfindung wird nachfolgend anhand des in der Zeichnung dargestellten Blockschaltbildes ergänzend erläutert.The Invention will be described below with reference to the drawing Block diagram complementary explained.
In
der einzigen Figur sind in Form einer Explosionszeichnung der prinzipielle
Aufbau eines LCD-Displays und die Energiesparschaltung in Form eines
Blockschaltbildes dargestellt. Das LCD-Display
Gemäß der Erfindung
ist vorgesehen, dass jede der Lampen der Lampenanordnung
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10354238A DE10354238A1 (en) | 2003-11-19 | 2003-11-19 | Energy-saving circuit for flat display devices illuminated from behind, has sources of light shaped as bars and spots arranged in a reflective casing behind the display |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10354238A DE10354238A1 (en) | 2003-11-19 | 2003-11-19 | Energy-saving circuit for flat display devices illuminated from behind, has sources of light shaped as bars and spots arranged in a reflective casing behind the display |
Publications (1)
Publication Number | Publication Date |
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DE10354238A1 true DE10354238A1 (en) | 2005-06-30 |
Family
ID=34625152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10354238A Withdrawn DE10354238A1 (en) | 2003-11-19 | 2003-11-19 | Energy-saving circuit for flat display devices illuminated from behind, has sources of light shaped as bars and spots arranged in a reflective casing behind the display |
Country Status (1)
Country | Link |
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DE (1) | DE10354238A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0789856B1 (en) * | 1994-10-31 | 1998-09-16 | Honeywell Inc. | Field emitter liquid crystal display |
JPH11184442A (en) * | 1997-12-25 | 1999-07-09 | Casio Comput Co Ltd | Back light controller and storage medium |
JP2001318615A (en) * | 2001-03-22 | 2001-11-16 | Nec Corp | Liquid crystal display device |
US20010043179A1 (en) * | 2000-03-30 | 2001-11-22 | Hideki Yoshinaga | Liquid crystal display apparatus and driving method for the liquid crystal display apparatus |
EP1213699A2 (en) * | 2000-11-30 | 2002-06-12 | Hitachi, Ltd. | Backlight control for a liquid crystal display device |
EP1255241A1 (en) * | 2001-04-24 | 2002-11-06 | Nec Corporation | Image display method in transmissive-type liquid crystal display device and transmissive-type liquid crystal display device |
EP1353317A2 (en) * | 2002-04-08 | 2003-10-15 | Sun Microsystems, Inc. | Method and apparatus for dimming a lamp in a backlight of a liquid crystal display |
-
2003
- 2003-11-19 DE DE10354238A patent/DE10354238A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0789856B1 (en) * | 1994-10-31 | 1998-09-16 | Honeywell Inc. | Field emitter liquid crystal display |
JPH11184442A (en) * | 1997-12-25 | 1999-07-09 | Casio Comput Co Ltd | Back light controller and storage medium |
US20010043179A1 (en) * | 2000-03-30 | 2001-11-22 | Hideki Yoshinaga | Liquid crystal display apparatus and driving method for the liquid crystal display apparatus |
EP1213699A2 (en) * | 2000-11-30 | 2002-06-12 | Hitachi, Ltd. | Backlight control for a liquid crystal display device |
JP2001318615A (en) * | 2001-03-22 | 2001-11-16 | Nec Corp | Liquid crystal display device |
EP1255241A1 (en) * | 2001-04-24 | 2002-11-06 | Nec Corporation | Image display method in transmissive-type liquid crystal display device and transmissive-type liquid crystal display device |
EP1353317A2 (en) * | 2002-04-08 | 2003-10-15 | Sun Microsystems, Inc. | Method and apparatus for dimming a lamp in a backlight of a liquid crystal display |
Non-Patent Citations (4)
Title |
---|
JP 11184442 A (Internet: http://www19.ipld.ncipi.go.jp/PA1/cgi-bin/PA1INDEX) in: Patent Abtracts of Japan * |
JP 11-184442 A(Internet: http://www19.ipld.ncipi.g o.jp/PA1/cgi-bin/PA1INDEX) |
JP 2001318615 A (Internet: http://www19.ipld.ncipi.gojp/PA1/cgi-bin/PA1INDEX) in: Patent Abtracts of Japan * |
JP 2001-318615 A(Internet: http://www19.ipld.ncipi .gojp/PA1/cgi-bin/PA1INDEX) |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8130 | Withdrawal |