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 PDFInfo
- 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
- Authority
- DE
- Germany
- Prior art keywords
- pulse width
- color
- adjusting
- brightness
- forward current
- 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.)
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Classifications
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- 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
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- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
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:
Es
wird zunächst
auf
Es
ist im Folgenden angenommen, dass ein erster LED-Durchlassstrom
I1 (
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004023186A DE102004023186A1 (en) | 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 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004023186A DE102004023186A1 (en) | 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 |
Publications (1)
Publication Number | Publication Date |
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DE102004023186A1 true DE102004023186A1 (en) | 2005-12-08 |
Family
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Family Applications (1)
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DE102004023186A Ceased DE102004023186A1 (en) | 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 |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
US8866410B2 (en) | 2007-11-28 | 2014-10-21 | 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 |
US20150116379A1 (en) * | 2013-10-31 | 2015-04-30 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display using the same |
DE102009029556B4 (en) * | 2008-09-22 | 2019-07-18 | Acewell International Co., Ltd. | Control circuit for adjusting a backlight and associated method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040027319A1 (en) * | 1999-11-12 | 2004-02-12 | Takeshi Kamikawa | Light emitting apparatus, method for driving the light emitting apparatus, and display apparatus including the light emitting apparatus |
-
2004
- 2004-05-11 DE DE102004023186A patent/DE102004023186A1/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040027319A1 (en) * | 1999-11-12 | 2004-02-12 | Takeshi Kamikawa | Light emitting apparatus, method for driving the light emitting apparatus, and display apparatus including the light emitting apparatus |
Non-Patent Citations (5)
Title |
---|
Golden Dragon 1 Watt LED "LW W5SG". Vorläufiges Datenblatt, OSRAM Opto Semiconductors GmbH, D-93049 Regensburg, 08.09.2003. Im Internet: http://rocky.digikey.com/-WebLib/Osram/Web%20Data/ LW_W5SG.pdf |
Golden Dragon 1 Watt LED "LW W5SG". Vorläufiges Datenblatt, OSRAM Opto Semiconductors GmbH, D-93049 Regensburg, 08.09.2003. Im Internet: http://rocky.digikey.com/-WebLib/Osram/Web%20Data/LW_W5SG.pdf * |
JP 2002134284 A (abstract). DOKIDX (online) (rech. am 07.02.05). In: DEPATIS |
JP 2002134284 A (abstract). DOKIDX (online) (rech.am 07.02.05). In: DEPATIS * |
Lichtforum 40 "LED-die neue Lichtquelle". Fördergemeinschaft Gutes Licht, 60596 Frankfurt am Main, 11/2001. Im Internet: www.-licht.dkd.de/ index.php?395&tt_products=15> * |
Cited By (20)
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 |
US8115416B2 (en) | 2007-11-09 | 2012-02-14 | Diehl Aerospace Gmbh | Method for generating mixed light colors |
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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OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |