DE102004045002A1 - Energy saving mode control for the back lighting of a flat panel display is switched by having a sensor that detects user distance from screen - Google Patents

Energy saving mode control for the back lighting of a flat panel display is switched by having a sensor that detects user distance from screen Download PDF

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Publication number
DE102004045002A1
DE102004045002A1 DE200410045002 DE102004045002A DE102004045002A1 DE 102004045002 A1 DE102004045002 A1 DE 102004045002A1 DE 200410045002 DE200410045002 DE 200410045002 DE 102004045002 A DE102004045002 A DE 102004045002A DE 102004045002 A1 DE102004045002 A1 DE 102004045002A1
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Germany
Prior art keywords
backlight
sensor
screen
saving mode
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.)
Ceased
Application number
DE200410045002
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German (de)
Inventor
Ralf Edelbrock
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Siemens AG
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Siemens AG
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Publication date
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Priority to DE200410045002 priority Critical patent/DE102004045002A1/en
Publication of DE102004045002A1 publication Critical patent/DE102004045002A1/en
Ceased legal-status Critical Current

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F27/00Combined visual and audible advertising or displaying, e.g. for public address
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

A flat screen display [3] has a back lighting system [5]. The screen has a sensor [6] that generates an output dependent upon the screen distance from the user. This provides input to a controller [2] to regulate the backlighting such that shut down to an energy saving mode is selected if the user moves away.

Description

Die Erfindung betrifft eine Anordnung mit einem Panel eines Flachbildschirms, welches durch das Licht eines Backlights hinterleuchtbar ist, und mit einer Backlight-Regelung, durch welche die Intensität des Lichts des Backlights einstellbar ist.The Invention relates to an arrangement with a panel of a flat screen, which is backlit by the light of a backlight, and with a backlight control, by which the intensity of the light the backlight is adjustable.

Gewöhnlich ist zur Regelung der Leuchtdichte des Backlights für ein so genanntes LCD-Panel (LCD-Anzeigemodul eines Flachbildschirms) eine Backlight-Regelung vorgesehen. Diese Backlight-Regelung stellt die von einem Sensor erfasste Leuchtdichte des Backlights, dessen Licht das Panel hinterleuchtet, im Wesentlichen auf einen konstanten Sollwert ein. Um zu gewährleisten, dass der Flachbildschirm in einem so genannten Energiesparmodus betreibbar ist, sind Maßnahmen vorgesehen, welche das Licht des Backlights nach einem vorgegebenen Zeitintervall abschalten, wodurch das Panel dunkelgeschaltet wird, wobei ein Grafikprozessor digitalisierte Bildinformationen auswertet, um zu erkennen, ob der Energiesparmodus einzuschalten ist. Dabei kann es vorkommen, dass das Zeitintervall zu lang bemessen ist, was sich nachteilig auf die Lebensdauer des Backlights auswirkt.Usually is for controlling the luminance of the backlight for a so-called LCD panel (LCD display module a flat screen) a backlight control provided. These Backlight control represents the luminance detected by a sensor the backlight, whose light backlit the panel, essentially to a constant setpoint. To ensure that the flat screen is operable in a so-called energy-saving mode, are measures provided which the light of the backlight after a predetermined time interval turn off, causing the panel to go dark, using a graphics processor evaluates digitized image information to see if the Power saving mode is on. It may happen that the time interval is too long, which is detrimental to the life of the backlight affects.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs genannten Art anzugeben, die das Einschalten eines Energiesparmodus vereinfacht.Of the present invention is based on the object, an arrangement specify the type mentioned, the switching on a Energy saving mode simplified.

Diese Aufgabe wird dadurch gelöst, dass ein Sensor vorgesehen ist, welcher den Abstand eines Betrachters von dem Panel erfasst und ein diesem Abstand entsprechendes Abstandssignal der Backlight-Regelung übermittelt, welche in Abhängigkeit des Abstandssignals das Licht des Backlights ausschaltet oder die Lichtintensität des Backlights vermindert.These Task is solved by that a sensor is provided, which is the distance of a viewer detected by the panel and a distance signal corresponding to this distance transmits the backlight control, which depending on the Distance signal turns off the light of the backlight or the light intensity of the backlight reduced.

Vorteilhaft ist, dass auf eine Vorgabe eines Zeitintervalls zum Aktivieren des Energiesparmodus verzichtet werden kann. Der Abstandssensor erfasst kontinuierlich den Abstand des Betrachters und es wird dadurch sofort erkannt, ob der Betrachter seinen Bildschirm-Arbeitsplatz verlässt. Ist dies der Fall, wird die Lichtintensität des Backlights vermindert bzw. das Licht des Backlights ausgeschaltet, wodurch die Lebensdauer des Backlights erhöht wird.Advantageous is that upon specifying a time interval to activate the Energy saving mode can be dispensed with. The distance sensor detects continuously the distance of the viewer and it is immediately recognized whether the viewer leaves his screen workstation. is If this is the case, the light intensity of the backlight is reduced or the light of the backlight turned off, reducing the life the backlight increased becomes.

In einer Ausgestaltung der Erfindung ist der Sensor an einem Rahmen des Flachbildschirms angeordnet und ist integraler Bestandteil des Flachbildschirms.In An embodiment of the invention is the sensor on a frame arranged on the flat screen and is an integral part of the Flat panel display.

In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, die Lichtintensität auf einen vorgebbaren Wert zu vermindern. Dieser wird z. B. so gewählt, dass ein Betrachter sofort erkennt, dass der Flachbildschirm nicht ausgeschaltet, sondern der Energiesparmodus aktiviert ist.In a further embodiment of the invention is provided, the light intensity on a to reduce the presettable value. This is z. B. chosen so that a viewer immediately realizes that the flat screen is not turned off, but the energy saving mode is activated.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die einzige Figur der Zeichnung näher erläutert. Die Figur der Zeichnung zeigt in schematischer Darstellung eine Anordnung zur Einstellung der Leuchtdichte eines Backlights für ein LCD-Panel.The Invention will now be described with reference to an embodiment with reference explained in more detail on the single figure of the drawing. The figure of the drawing shows a schematic representation of an arrangement for adjustment the luminance of a backlight for an LCD panel.

In der Figur ist mit 1 ein Grafikprozessor bezeichnet, welchem hier nicht dargestellte digitalisierte Bildinformationen zur Darstellung auf einem LCD-Panel 3 eines Flachbildschirms zuführbar sind. Der Grafikprozessor 1 übermittelt einer Backlight-Regelung 2 einen vorgebbaren Sollwert Sw, welche die Leuchtdichte des Panels 3 im Wesentlichen konstant auf eine dem Sollwert Sw entsprechende Sollwert-Leuchtdichte einstellt, wobei der Sollwert Sw derart vorgegeben ist, dass die Leuchtdichte eines auf dem Panel 3 darstellbaren Bildes einen optimalen Bildeindruck bewirkt. Zur Einstellung der Leuchtdichte ist ein Backlight-Sensor 4 vorgesehen, der das Licht eines Backlights 5 erfasst, welches das Panel 3 hinterleuch tet und dessen Lichtintensität eine entsprechende Leuchtdichte auf dem Panel 3 bewirkt. Ein dieser Leuchtdichte des Backlights 5 entsprechender Istwert Iw führt der Backlight-Sensor 4 der Backlight-Regelung 2 zu, welche diesen Istwert Iw auf den Sollwert Sw einregelt.In the figure is with 1 denotes a graphics processor, which is not shown here digitized image information for display on an LCD panel 3 a flat screen can be fed. The graphics processor 1 transmits a backlight control 2 a predefinable setpoint Sw, which is the luminance of the panel 3 set substantially constant to a target value corresponding to the target value Sw luminance, wherein the target value Sw is predetermined such that the luminance of one on the panel 3 displayable image causes an optimal image impression. To adjust the luminance is a backlight sensor 4 provided the light of a backlight 5 captured the panel 3 backlit tet and its light intensity corresponding luminance on the panel 3 causes. One of these luminosity of the backlight 5 corresponding actual value Iw leads the backlight sensor 4 the backlight control 2 to, which adjusts this actual value Iw to the setpoint Sw.

Zur Einstellung eines Energiesparmodus ist ein Sensor 6 vorgesehen, welcher den Abstand eines Betrachters von dem Panel 3 erfasst und ein dem erfassten Abstand entsprechendes Abstandssignal As der Backlight-Regelung 2 übermittelt.To set a power saving mode is a sensor 6 provided, which is the distance of a viewer from the panel 3 detected and a distance corresponding to the detected distance As the backlight control 2 transmitted.

Die Backlight-Regelung 2 wertet dieses Abstandssignal As aus und für den Fall, dass die Auswertung ergibt, dass der Betrachter einen vorgegebenen Abstand überschritten hat, was darauf hinweist, dass der Betrachter seinen Bildschirm-Arbeitsplatz verlassen hat, schaltet die Backlight-Regelung 2 das Licht des Backlights 5 aus oder vermindert die Lichtintensität des Backlights 5.The backlight control 2 evaluates this distance signal As and in the event that the evaluation shows that the viewer has exceeded a predetermined distance, indicating that the viewer has left his screen workstation, the backlight control 2 the light of the backlight 5 off or diminishes the light intensity of the backlight 5 ,

Claims (3)

Anordnung mit einem Panel (3) eines Flachbildschirms, welches durch das Licht eines Backlights (5) hinterleuchtbar ist, mit einer Backlight-Regelung (2), durch welche die Intensität des Lichts des Backlights (5) einstellbar ist, dadurch gekennzeichnet, dass ein Sensor (6) vorgesehen ist, welcher den Abstand eines Betrachters von dem Panel (3) erfasst und ein diesem Abstand entsprechendes Abstandssignal (As) der Backlight-Regelung (2) übermittelt, welche in Abhängigkeit des Abstandssignals (As) – das Licht des Backlights (5) ausschaltet oder – die Lichtintensität des Backlights (5) vermindert.Arrangement with a panel ( 3 ) of a flat screen, which by the light of a backlight ( 5 ) is backlit, with a backlight control ( 2 ), through which the intensity of the light of the backlight ( 5 ), characterized in that a sensor ( 6 ) is provided, which the Distance of a viewer from the panel ( 3 ) and a distance signal (As) corresponding to the backlight control ( 2 ), which depending on the distance signal (As) - the light of the backlight ( 5 ) or - the light intensity of the backlight ( 5 ) decreased. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass der Sensor (4) an einem Rahmen des Flachbildschirms angeordnet ist.Arrangement according to claim 1, characterized in that the sensor ( 4 ) is arranged on a frame of the flat screen. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Backlight-Regelung (2) die Lichtintensität des Backlights (5) auf einen vorgebbaren Wert vermindert.Arrangement according to claim 1 or 2, characterized in that the backlight control ( 2 ) the light intensity of the backlight ( 5 ) is reduced to a predefinable value.
DE200410045002 2004-09-16 2004-09-16 Energy saving mode control for the back lighting of a flat panel display is switched by having a sensor that detects user distance from screen Ceased DE102004045002A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056729A1 (en) * 2004-11-24 2005-09-01 Siemens Ag Display panel arrangement has control unit and distance sensor that transmits distance signal to control unit, which switches off display unit if user is not detected within given range of panel
CN101815127A (en) * 2010-04-12 2010-08-25 中兴通讯股份有限公司 Mobile terminal and method for adjusting visual effect of screen thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0631170A2 (en) * 1993-06-24 1994-12-28 International Business Machines Corporation Back-lighting system for transmissive display
US20040155854A1 (en) * 2003-02-12 2004-08-12 Nvidia Corporation Gradual dimming of backlit displays

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0631170A2 (en) * 1993-06-24 1994-12-28 International Business Machines Corporation Back-lighting system for transmissive display
US20040155854A1 (en) * 2003-02-12 2004-08-12 Nvidia Corporation Gradual dimming of backlit displays

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
JP 06250152 A (Internet:http://aipn.ipdl.ncipi.go. jp/A12/html/top.html)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056729A1 (en) * 2004-11-24 2005-09-01 Siemens Ag Display panel arrangement has control unit and distance sensor that transmits distance signal to control unit, which switches off display unit if user is not detected within given range of panel
CN101815127A (en) * 2010-04-12 2010-08-25 中兴通讯股份有限公司 Mobile terminal and method for adjusting visual effect of screen thereof

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