DE10201280A1 - Temperaturkompensierter paralleler LED Steuerschaltkreis - Google Patents
Temperaturkompensierter paralleler LED SteuerschaltkreisInfo
- Publication number
- DE10201280A1 DE10201280A1 DE10201280A DE10201280A DE10201280A1 DE 10201280 A1 DE10201280 A1 DE 10201280A1 DE 10201280 A DE10201280 A DE 10201280A DE 10201280 A DE10201280 A DE 10201280A DE 10201280 A1 DE10201280 A1 DE 10201280A1
- Authority
- DE
- Germany
- Prior art keywords
- circuit
- light
- emitting diode
- temperature
- led
- 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.)
- Granted
Links
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- 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]
- H05B45/10—Controlling the intensity of the light
- H05B45/18—Controlling the intensity of the light using temperature feedback
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0085—Means for removing heat created by the light source from the package
-
- 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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- 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
- G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
Description
CCFL - Kaltkathoden-Fluoreszenzlampe (Cold Cathode Fluorescent Lamp).
CCFL inverter - Ein Schaltkreis, der die erforderliche Spannung und den erforderlichen Strom bereitstellt, um die Lichtausgabe einer CCFL auf geeignete Weise zu steuern.
IRDA - Infrarot-Datenverbindung (Infrared Data Association).
LCD - Fllüssigkristallanzeige (Liquid Crystal Display).
EDR - Angereicherter diffuser Reflektor (Enhanced Diffuse Reflector). LED - Leuchtdiode (Light Emitting Diode).
Lumen - Eine Einheit der Lichtleistung, die für das menschliche Auge nutzbar ist und die als die spektrale Lichtleistung für monochromatisches Licht bei der maximalen sichtbaren Ansprechwellenlänge von 555 nm definiert ist.
NIT - Eine Einheit der Bildhelligkeit für reflektiertes, durchgelassenes oder von einer streu enden Oberfläche ausgesendetes Licht.
PWM - Pulsbreitenmodulation (Pulse Width Modulation).
Claims (40)
eine Vielzahl von Leuchtdioden, die jeweils einen Anoden- und Kathodenanschluss aufweisen; und
einen Stromquellenschaltkreis, der eine Vielzahl von Stromquellentransistoren umfasst;
wobei die Leuchtdioden parallel geschaltet sind, so dass der Anodenanschluss jeder Leuchtdiode mit einem unterschiedlichen Stromquellentransistor leitend verbunden ist und der Kathodenanschluss jeder Leuchtdiode mit einem Masseknoten elektrisch gekoppelt ist.
eine Flüssigkristallanzeige;
eine Hintergrundbeleuchtungs-Leuchtdiodenanordnung, die eine Vielzahl von Leuchtdioden in einer parallelen Anordnung umfasst,
wobei ein Kathodenanschluss jeder Leuchtdiode mit einem gemeinsamen Masseknoten verbunden ist,
wobei die Hintergrund beleuchtungs-Leuchtdiodenanordnung die Flüssigkristallanzeige rückseitig beleuchtet; und
ein Stromquellenschaltkreis, der im Wesentlichen gleiche elektrische Ströme, die jeder Leuchtdiode zugeführt werden, aufrecht erhält.
einen Temperatur-Herabsetzungsschaltkreis, der mit dem Stromquellenschaltkreis leitend verbunden ist;
wobei der Temperatur-Herabsetzungsschaltkreis die Intensität der Leuchtdiodenanordnung als eine Funktion einer Temperatur verringert, die an dem gemeinsamen Masseknoten gemessen wird, nachdem ein Schwellenwert erreicht worden ist.
einen Lichtleiter in der Nähe der Flüssigkristallanzeige und der Leuchtdiodenanord nung; und
ein Gehäuse, das wenigstens einen Abschnitt der Flüssigkristallanzeige, des Licht leiters und der Leuchtdiodenanordnung umgibt.
eine Leuchtdioden-Steuereinrichtung, die ein Pulsbreiten-moduliertes Signal bereit stellt, das die Intensität der Leuchtdiodenanordnung steuert.
eine Leuchtdioden-Steuereinrichtung, die ein analoges Gleichspannungssignal bereitstellt, das die Intensität der Leuchtdiodenanordnung steuert.
Überwachen einer Temperatur einer Leuchtdiodenanordnung an einem Knoten, der mit einer Leuchtdiode verbunden ist; und
Bereitstellen eines temperaturgeregelten Signals an die Leuchtdiode.
Überwachen einer Vergleichsstromquelle; und
Abgleichen des temperaturgeregelten Signals als eine Funktion eines Stroms aus der Vergleichsstromquelle.
eine Flüssigkristallanzeige;
einen Lichtleiter, der hinter der Flüssigkristallanzeige angeordnet ist;
eine Leuchtdiodenanordnung;
einen gerichteten Reflektor, der Licht aus der Leuchtdiode in den Lichtleiter reflek tiert;
eine Leiterplatte mit einer ersten und zweiten Seite, wobei die Leuchtdiodenanord nung mit der ersten Seite verbunden ist und ein Steuerschaltkreis der Leuchtdiodenanord nung mit der anderen Seite verbunden ist;
einen Rahmen, in dem die Flüssigkristallanzeige, der Lichtleiter, die Leuchtdiodenan ordnung und die Leiterplatte untergebracht sind, wobei die Leiterplatte mit dem Rahmen thermisch verbunden ist.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26176001P | 2001-01-16 | 2001-01-16 | |
US60/261,760 | 2001-01-16 | ||
US09/939,493 US6717559B2 (en) | 2001-01-16 | 2001-08-23 | Temperature compensated parallel LED drive circuit |
US09/939,493 | 2001-08-23 | ||
DE10262251 | 2002-01-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10201280A1 true DE10201280A1 (de) | 2002-09-05 |
DE10201280B4 DE10201280B4 (de) | 2008-04-03 |
Family
ID=26948817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10201280A Expired - Fee Related DE10201280B4 (de) | 2001-01-16 | 2002-01-15 | Anzeigeeinheit mit Leuchtdioden-Hintergrundbeleuchtung |
Country Status (3)
Country | Link |
---|---|
US (1) | US6717559B2 (de) |
DE (1) | DE10201280B4 (de) |
GB (1) | GB2374990B (de) |
Cited By (6)
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ITMI20081476A1 (it) * | 2008-08-06 | 2010-02-07 | I C A Internat S R L | Dispositivo di illuminazione per elettrodomestici |
WO2013052401A1 (en) * | 2011-10-02 | 2013-04-11 | Cree, Inc. | Over-temperature handling of lighting device |
EP2789902A3 (de) * | 2013-04-09 | 2014-10-29 | Whirlpool Corporation | Geräteanzeigen mit modularen Lichtleitern und Verfahren zur Montage davon |
US8890420B2 (en) | 2011-10-02 | 2014-11-18 | Cree, Inc. | Temperature curve compensation offset |
EP3780911A1 (de) * | 2019-08-13 | 2021-02-17 | ZKW Group GmbH | Kraftfahrzeug-beleuchtungseinrichtung |
DE102020204513A1 (de) | 2020-04-07 | 2021-10-07 | Siemens Mobility GmbH | Beleuchtungsverfahren und -vorrichtung |
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2002
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- 2002-01-15 DE DE10201280A patent/DE10201280B4/de not_active Expired - Fee Related
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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ITMI20081476A1 (it) * | 2008-08-06 | 2010-02-07 | I C A Internat S R L | Dispositivo di illuminazione per elettrodomestici |
WO2013052401A1 (en) * | 2011-10-02 | 2013-04-11 | Cree, Inc. | Over-temperature handling of lighting device |
US8890420B2 (en) | 2011-10-02 | 2014-11-18 | Cree, Inc. | Temperature curve compensation offset |
US9137873B2 (en) | 2011-10-02 | 2015-09-15 | Cree, Inc. | Overcurrent handling for a lighting device |
US9713226B2 (en) | 2011-10-02 | 2017-07-18 | Cree, Inc. | Over-voltage handling of lighting device |
US10021756B2 (en) | 2011-10-02 | 2018-07-10 | Cree, Inc. | Over-temperature handling for lighting device |
EP2789902A3 (de) * | 2013-04-09 | 2014-10-29 | Whirlpool Corporation | Geräteanzeigen mit modularen Lichtleitern und Verfahren zur Montage davon |
US9179554B2 (en) | 2013-04-09 | 2015-11-03 | Whirlpool Corporation | Appliance displays having modular light guides and methods of assembling the same |
EP3780911A1 (de) * | 2019-08-13 | 2021-02-17 | ZKW Group GmbH | Kraftfahrzeug-beleuchtungseinrichtung |
DE102020204513A1 (de) | 2020-04-07 | 2021-10-07 | Siemens Mobility GmbH | Beleuchtungsverfahren und -vorrichtung |
DE102020204513B4 (de) | 2020-04-07 | 2024-01-25 | Siemens Mobility GmbH | Beleuchtungsverfahren und -vorrichtung |
Also Published As
Publication number | Publication date |
---|---|
US20020135572A1 (en) | 2002-09-26 |
GB2374990A (en) | 2002-10-30 |
DE10201280B4 (de) | 2008-04-03 |
GB2374990B (en) | 2003-06-04 |
GB0200652D0 (en) | 2002-02-27 |
US6717559B2 (en) | 2004-04-06 |
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