DE102004023186A1 - Procedure for adjusting color co-ordinates of LED source of backlight of LCD display involves altering amplitude of current and then adjusting pulse width - Google Patents

Procedure for adjusting color co-ordinates of LED source of backlight of LCD display involves altering amplitude of current and then adjusting pulse width Download PDF

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Publication number
DE102004023186A1
DE102004023186A1 DE102004023186A DE102004023186A DE102004023186A1 DE 102004023186 A1 DE102004023186 A1 DE 102004023186A1 DE 102004023186 A DE102004023186 A DE 102004023186A DE 102004023186 A DE102004023186 A DE 102004023186A DE 102004023186 A1 DE102004023186 A1 DE 102004023186A1
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Germany
Prior art keywords
pulse width
color
adjusting
brightness
forward current
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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
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DE102004023186A
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German (de)
Inventor
Wolfgang Eckhardt
Bernd Ehrmann
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Siemens AG
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Siemens AG
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Priority to DE102004023186A priority Critical patent/DE102004023186A1/en
Publication of DE102004023186A1 publication Critical patent/DE102004023186A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • 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
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude 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
    • G09G2320/064—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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Abstract

The method involves following steps:- a) on the basis of the brightness given in advance the amplitude (Ia, Ib, IC) of the pulse-width-modulated on-state current (I1, I2, I3) is altered , until a specified color co-ordinate appears. b) after adjusting the color co-ordinate in accordance with step A) the pulse width (Pa, Pb, PC) of the pulse-width-modulated current (I1, I2, I3) is altered until a specified brightness appears.

Description

Die Erfindung betrifft ein Verfahren zum Einstellen eines Farbortes eines von einer LED-Lichtquelle eines Backlights emittierten Lichts bei einer vorgebbaren Helligkeit, durch welches ein Panel hinterleuchtbar ist.The The invention relates to a method for adjusting a color location a light emitted from an LED light source of a backlight at a predefinable brightness, through which a panel can be backlit is.

Zur Hinterleuchtung eines LCD-Panels (LCD-Anzeigemodul eines Flachbildschirms) wird gewöhnlich ein so genanntes Backlight verwendet, welches mit einer LED-Lichtquelle versehen ist. Insbesondere im medizinischen Bereich werden monochrome Flachbildschirme eingesetzt, deren Backlights weißes Licht erzeugen, wobei zur Einstellung der Helligkeit der Durchlassstrom der LEDs entsprechend verändert wird.to Backlighting of an LCD panel (LCD display module of a flat screen) becomes ordinary used a so-called backlight, which uses an LED light source is provided. Especially in the medical field become monochrome Flat screens are used, their backlights white light generate, wherein for adjusting the brightness of the forward current the LEDs changed accordingly becomes.

Aus dem Datenblatt „LW W5SG" vom 27.11.2003 der Fa. OSRAM ist bekannt, dass der Farbort eines von einer LED emittierten Lichts abhängig ist von einem LED-Durchlassstrom. Eine derartige Abhängigkeit ist unerwünscht, wodurch viele Hersteller von LEDs bestrebt sind, diesen Effekt weitestgehend zu beseitigen.Out the data sheet "LW W5SG "from 27.11.2003 The company OSRAM is aware that the color locale is one of an LED emitted light dependent is of an LED forward current. Such a dependence is undesirable, which many manufacturers of LEDs strive to this effect as far as possible to eliminate.

Die Druckschrift „LED – die neue Lichtquelle", welche unter der Internetadresse http://www.licht.dkd.de/index.php?395&tt products=l5 einsehbar ist, offenbart als Methode zum Dimmen von LEDs, eine Pulsweitenmodulation vorzusehen. Dabei wird bei konstant gehaltener Stromstärke das emittierte Licht durch eine Veränderung der Pulsbreite reguliert, wobei dadurch die Wellenlänge des Lichts nicht verändert wird. Dies bedeutet, dass eine derartige Regulierung den Farbort des emittierten Lichts nicht störend beeinflusst.The Publication "LED - the new Light source ", which under the Internet address http://www.licht.dkd.de/index.php?395&tt products = l5 can be seen, disclosed as a method for dimming LEDs, a pulse width modulation provided. At constant current is held emitted light by a change in the Pulse width regulated, thereby the wavelength of the light is not changed. This means that such a regulation the color location of the emitted Light not disturbing affected.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, den Farbort des Lichts eines Backlights eines LCD-Flachbild schirms, insbesondere eines monochromen LCD-Flachbildschirms, bei einer vorgebbaren Lichthelligkeit einfach verschieben zu können.Of the The present invention is based on the object, the color locus of the Light of a backlight of an LCD flat screen, in particular a monochrome LCD flat screen, with a specifiable light brightness easy to move.

Diese Aufgabe wird durch die im Patentanspruch angegebenen Maßnahmen gelöst.These The object is achieved by the measures specified in the claim solved.

Die Erfindung geht von der Idee aus, den an sich bekannten unerwünschten Effekt der Abhängigkeit des Farbortes eines LED-Lichts vom LED-Durchlassstrom auszunutzen.The Invention is based on the idea of the known undesirable Effect of dependency exploit the color location of an LED light from the LED forward current.

Ein Betrachter eines monochromen Flachbildschirms ändert den Farbort, indem er zunächst die Amplitude des LED-Durchlassstroms und somit die Helligkeit des Bildschirms so lange ändert, bis sich die gewünschte Farbe einstellt. Z. B. wechselt aufgrund der Helligkeitsänderung die Farbe von einem leicht „bläulichen Weiß" zu einem gewünschten leicht „gelblichen Weiß". Um die ursprüngliche Helligkeit ohne Farbortverschiebung, das bedeutet im vorliegenden Fall ohne Veränderung des eingestellten leicht „gelblichen Weißes", wieder einzustellen, verstellt der Betrachter anschließend die Pulsweite des Durchlassstromes so lange, bis sich die ursprüngliche Helligkeit wieder einstellt.One Viewer of a monochrome flat screen changes the color location by first the Amplitude of the LED forward current and thus the brightness of the screen changes so long until the desired Color sets. For example, changes due to the brightness change the color of a slightly 'bluish White "to a desired light" yellowish White. "To the original Brightness without color locus shift, that means in the present Case without change set slightly yellowish White ", the observer subsequently adjusts the pulse width of the forward current until the original one Adjust brightness again.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung veranschaulicht ist, werden im Folgenden die Erfindung, deren Ausgestaltungen sowie Vorteile näher erläutert.Based the drawing in which an embodiment The invention is illustrated below, the invention, their embodiments and advantages explained in more detail.

Es zeigen:It demonstrate:

1 ein Zeitdiagramm von LED-Durchlassströmen und 1 a timing diagram of LED forward currents and

2 die Abhängigkeit des Farbortes vom LED-Durchlassstrom in einer grafischen Darstellung. 2 the dependence of the color location on the LED forward current in a graphical representation.

Es wird zunächst auf 2 verwiesen, in welcher eine an sich bekannte Abhängigkeit des Farbortes von einem Durchlassstrom I einer LED dargestellt ist. Eine Änderung des Durchlassstromes I bewirkt eine Verschiebung von Farbkoordinaten Cx, Cy, was sich für einen Betrachter eines Flachbildschirmes in einer Farbänderung bemerkbar macht.It is going on first 2 referenced, in which a known dependence of the color location of a forward current I of an LED is shown. A change in the forward current I causes a shift of color coordinates Cx, Cy, which is noticeable to a viewer of a flat screen in a color change.

Es ist im Folgenden angenommen, dass ein erster LED-Durchlassstrom I1 (1a) einer LED-Lichtquelle eines Backlights auf einem Panel eines Flachbildschirms eine vorgebbare Helligkeit bewirkt. Diese Helligkeit ist durch einen Betrachter des Panels über einen Helligkeitseinsteller des Flachbildschirms vorgebbar. Der Durchlassstrom I1 weist eine Amplitude Ia und eine Pulsweite Pa auf. Um den Farbort zu verschieben, wird zunächst die Amplitude des Durchlassstromes Ia bei gleichbleibender Pulsweite Pa über den Helligkeitseinsteller verändert. Im dargestellten Beispiel (1b) wird dazu ein Durchlassstrom I2 eingestellt, dessen Amplitude Ib der halben Amplitude Ia des Durchlassstromes I1 entspricht. Neben der Farbortverschiebung aufgrund der Änderung der Amplitude bei gleichbleibender Pulsweite des Durchlassstromes ändert sich die Helligkeit des Panels, wobei die Helligkeitsänderung im gezeigten Beispiel dadurch rückgängig gemacht und die vorgebbare Helligkeit wieder hergestellt wird, indem die Pulsweite des Durchlassstromes über einen Pulsweiteneinsteller des Flachbildschirms verdoppelt wird. Durch die LED fließt daher ein Durchlassstrom I3 mit einer Amplitude Ib und einer Pulsweite Pc, welche der doppelten Pulsweite Pa des Durchlassstromes I2 entspricht.It is assumed below that a first LED forward current I1 (FIG. 1a ) causes a predefinable brightness of a LED light source of a backlight on a panel of a flat screen. This brightness can be specified by a viewer of the panel via a brightness adjuster of the flat screen. The forward current I1 has an amplitude Ia and a pulse width Pa. In order to shift the color locus, the amplitude of the forward current Ia is initially changed while the pulse width Pa remains constant via the brightness adjuster. In the example shown ( 1b For this purpose, a forward current I 2 is set, the amplitude Ib of which corresponds to half the amplitude Ia of the forward current I 1. In addition to the color locus shift due to the change in amplitude at the same pulse width of the forward current, the brightness of the panel changes, whereby the brightness change reversed in the example shown and the predetermined brightness is restored by the pulse width of the forward current is doubled via a pulse width of the flat panel. Therefore, a forward current I3 with an amplitude Ib and a pulse width Pc, which corresponds to twice the pulse width Pa of the forward current I2, flows through the LED.

Claims (1)

Verfahren zum Einstellen eines Farbortes (Cx, Cy) eines von einer LED-Lichtquelle eines Backlights emittierten Lichts bei einer vorgebbaren Lichthelligkeit, durch welches ein Panel hinterleuchtbar ist, wobei zur Einstellung ein pulsweitenmodulierter LED-Durchlassstrom (I1, I2, I3) vorgesehen ist, mit folgenden Verfahrensschritten: a) ausgehend von der vorgebbaren Helligkeit wird die Amplitude (Ia, Ib, Ic) des pulsweitenmodulierten Durchlassstromes (I1, I2, I3) so lange geändert, bis sich ein vorgebbarer Farbort einstellt, b) nach dem Einstellen des Farbortes gemäß dem Verfahrensschritt a) wird die Pulsweite (Pa, Pb, Pc) des pulsweitenmodulierten Durchlassstromes (I1, I2, I3) so lange geändert, bis sich die vorgebbare Helligkeit wieder einstellt.Method for setting a color locus (Cx, Cy) of a from a LED light source of a backlight emitted light a predefinable light brightness, through which a panel backlit is, wherein for setting a pulse width modulated LED forward current (I1, I2, I3), with the following process steps: a) starting from the predefinable brightness, the amplitude (Ia, Ib, Ic) of the pulse width modulated forward current (I1, I2, I3) changed so long until a predefinable color locus sets, b) after adjustment the color location according to the method step a) becomes the pulse width (Pa, Pb, Pc) of the pulse width modulated forward current (I1, I2, I3) changed so long until the predefinable brightness returns.
DE102004023186A 2004-05-11 2004-05-11 Procedure for adjusting color co-ordinates of LED source of backlight of LCD display involves altering amplitude of current and then adjusting pulse width Ceased DE102004023186A1 (en)

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EP1950730A2 (en) 2007-01-24 2008-07-30 Sony Corporation Backlight and liquid crystal display
WO2009017724A1 (en) * 2007-07-31 2009-02-05 Cree, Inc. Correction of temperature induced color drift in solid state lighting displays
GB2454557A (en) * 2007-11-09 2009-05-13 Diehl Aerospace Gmbh Generating mixed light colours
US7724316B2 (en) 2006-09-22 2010-05-25 Sony Corporation Backlight device and display apparatus
US7789527B2 (en) 2004-05-11 2010-09-07 Sony Corporation Backlight device and color liquid crystal display
US7808585B2 (en) 2004-07-15 2010-10-05 Sony Corporation Color filter and color LCD apparatus having red filter with a peak wavelength between 685 nm and 690 nm and a red light source having a peak wavelength of between 640 nm and 645 nm
US7969097B2 (en) 2006-05-31 2011-06-28 Cree, Inc. Lighting device with color control, and method of lighting
DE102010000672A1 (en) * 2010-01-05 2011-07-07 Tridonic Ag Combined method for operating an electrical lamp and operating circuit
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DE102009029556B4 (en) * 2008-09-22 2019-07-18 Acewell International Co., Ltd. Control circuit for adjusting a backlight and associated method

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Cited By (20)

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Publication number Priority date Publication date Assignee Title
US7789527B2 (en) 2004-05-11 2010-09-07 Sony Corporation Backlight device and color liquid crystal display
US7808585B2 (en) 2004-07-15 2010-10-05 Sony Corporation Color filter and color LCD apparatus having red filter with a peak wavelength between 685 nm and 690 nm and a red light source having a peak wavelength of between 640 nm and 645 nm
US7969097B2 (en) 2006-05-31 2011-06-28 Cree, Inc. Lighting device with color control, and method of lighting
US7724316B2 (en) 2006-09-22 2010-05-25 Sony Corporation Backlight device and display apparatus
US8013533B2 (en) 2006-11-10 2011-09-06 Koninklijke Philips Electronics N.V. Method and driver for determining drive values for driving a lighting device
US8400392B2 (en) 2006-12-01 2013-03-19 Sony Corporation Apparatus and method for controlling backlight and liquid crystal display
EP1950730A2 (en) 2007-01-24 2008-07-30 Sony Corporation Backlight and liquid crystal display
US9099045B2 (en) 2007-01-24 2015-08-04 Thomson Licensing Backlight apparatus, backlight controlling method and liquid crystal display apparatus
EP1950730A3 (en) * 2007-01-24 2009-07-22 Sony Corporation Backlight and liquid crystal display
WO2009017724A1 (en) * 2007-07-31 2009-02-05 Cree, Inc. Correction of temperature induced color drift in solid state lighting displays
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GB2454557B (en) * 2007-11-09 2012-07-25 Diehl Aerospace Gmbh Method for generating mixed light colours
GB2454557A (en) * 2007-11-09 2009-05-13 Diehl Aerospace Gmbh Generating mixed light colours
US8866410B2 (en) 2007-11-28 2014-10-21 Cree, Inc. Solid state lighting devices and methods of manufacturing the same
US9491828B2 (en) 2007-11-28 2016-11-08 Cree, Inc. Solid state lighting devices and methods of manufacturing the same
US8994615B2 (en) 2008-06-06 2015-03-31 Dolby Laboratories Licensing Corporation Apparatus and methods for driving solid-state illumination sources
DE102009029556B4 (en) * 2008-09-22 2019-07-18 Acewell International Co., Ltd. Control circuit for adjusting a backlight and associated method
DE102010000672A1 (en) * 2010-01-05 2011-07-07 Tridonic Ag Combined method for operating an electrical lamp and operating circuit
US20150116379A1 (en) * 2013-10-31 2015-04-30 Lg Display Co., Ltd. Backlight unit and liquid crystal display using the same
US9478175B2 (en) * 2013-10-31 2016-10-25 Lg Display Co., Ltd. Backlight unit and liquid crystal display using the same

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