EP2102846A1 - Led module with dedicated colour regulation and corresponding method - Google Patents

Led module with dedicated colour regulation and corresponding method

Info

Publication number
EP2102846A1
EP2102846A1 EP06830637A EP06830637A EP2102846A1 EP 2102846 A1 EP2102846 A1 EP 2102846A1 EP 06830637 A EP06830637 A EP 06830637A EP 06830637 A EP06830637 A EP 06830637A EP 2102846 A1 EP2102846 A1 EP 2102846A1
Authority
EP
European Patent Office
Prior art keywords
led
led module
sensor
module according
sensor device
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Withdrawn
Application number
EP06830637A
Other languages
German (de)
French (fr)
Inventor
Peter Niedermeier
Oskar Schallmoser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2102846A1 publication Critical patent/EP2102846A1/en
Withdrawn legal-status Critical Current

Links

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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • 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
    • H05B45/22—Controlling the colour of the light using optical 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
    • 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
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to an LED module for backlighting a screen with at least one LED. Moreover, the present invention relates to a method for backlighting a screen by driving a plurality of LED modules with a predetermined current.
  • the backlighting of LCD screens is usually done using LEDs.
  • Several LED modules are interconnected and operated for this purpose.
  • the LED modules are connected in series.
  • Each module usually has one blue, one red and one or two green LEDs. These rows are then again arranged in parallel in order to achieve a uniform illumination of the screen.
  • the light output of LEDs and in particular of high-power LEDs ⁇ changes with the life and from ⁇ dependence on temperature. This results in a constant change of the emission spectrum or of the color (main emission line) on a wavelength or frequency scale. This change is basically undesirable and leads, when the LEDs are used for backlighting of LCD screens, to incorrect color representation of still and moving images. These color disturbances can occur both areally and punctually. So far backlighting for screens in the whole or line by line with respect to their color and their white point are readjusted. The final adjustment and adjustment are made after the pre-assembly of the back light unit (BLU) at the factory. Optionally, an automatic tracking of the Far ⁇ be in operation by just the entire screen or the individual lines are tracked. However, this does not always lead to high quality results.
  • BLU back light unit
  • the object of the present invention is thus to improve the quality of the readjustment of backlighting of a screen.
  • an LED module for backlighting a screen with at least one LED, a sensor device for detecting at least one physical variable and a drive device for driving the at least one LED in response to a signal of the sensor device.
  • the invention provides a method for readjusting an LED module for backlighting a screen by driving at least one LED of the LED module with a predetermined current, detecting at least one physical size of the LED module in the flow of the predetermined current through the LED and changing the current through the LED as a function of the at least one detected physical quantity.
  • each individual LED module is readjusted automatically, if its color changes during operation.
  • a very uniform and constant backlighting can be guaranteed for a long time.
  • the sensor device comprises a color sensor to detect color changes of the at least one LED.
  • the color sensor may be a V ( ⁇ ) sensor that is modeled on the eye sensitivity.
  • the color sensor can also be realized by simply using a brightness sensor and checking the LEDs of different colors successively with regard to their luminosity. This results indi ⁇ rectly detection of the color intensity.
  • the sensor device may also include a temperature sensor to detect a temperature of the LED module. This allows the brightness of the LEDs ⁇ fluctuations that arise due to temperature changes are compensated for.
  • the drive means may comprise a memory for storing a trim value and a comparator for comparing a current signal of the sensor device with the trim value.
  • a shunt transistor controlled by the drive device is connected in order to reduce the current flowing through the LED as a function of the detected physical variable.
  • the at least one LED with the Sen ⁇ sor coupled and the driving device on of a common circuit board, in particular a metal core board can be arranged and interconnected. This means that the entire ge ⁇ LED module can be easily and optionally also automatic ⁇ table process to an arrangement of a backlight.
  • the drive device has a data interface. Adjustment values can be entered in the desired manner in the LED modules during adjustment during pre-assembly via this interface.
  • the LED module has a plurality of LEDs, which are independently controllable by the Ansteu ⁇ er pain.
  • the tracking of each LED on the LED module can be done individually.
  • a plurality of LED modules of the type mentioned can be interconnected to form a backlighting device for a screen, wherein the plurality of LED modules are connected in series with one another.
  • 1 shows the external interconnection of a RGB LED module.
  • 2 shows the external interconnection of an RGGB module;
  • FIG. 3 shows a series connection of a plurality of LED modules according to FIG. 2;
  • FIG. 4 shows the internal structure of an LED module according to FIG. 2;
  • Fig. 5 is a cross sectional view of a LED module with indirek ⁇ ter, optical coupling of the sensor and
  • Fig. 6 is a cross-sectional view of an LED module with a more ⁇ ter, optical coupling of the sensor.
  • the reproduced in Fig. 1 LED module 1 has two An ⁇ connections Rl and R2, between which a red LED is closed ⁇ sen.
  • the terminal Rl is connected to the anode of the red LED and the terminal R2 to the cathode of the ro ⁇ th LED.
  • a drive signal R in particular a PWM signal (Pulse Width Modulation) is applied to control the red LED.
  • the operating current for the red LED leaves the LED module 1 in the present example at the port R2.
  • a green LED in the LED module 1 is connected to the two terminals Gl and G2 and is driven by a drive signal G.
  • a blue LED is operated in the LED module 1 via the terminals Bl and B2 with a drive signal B.
  • the LED module 1 is connected via a terminal M to ground.
  • the LED module 1 is ei ⁇ nes electrolytic capacitor C supplied with direct current using. This is powered internally by rectifying parts of the on control signals R, G, B with energy.
  • a LED module 2 vorzuse ⁇ hen two green LEDs, as indicated in Fig. 2.
  • the basic structure of the LED module 2 corresponds to the LED module 1 of Fig. 1.
  • the LED module 2 only two further terminals G3 and G4 are vorgese ⁇ hen for the two green LEDs, to control the two green LEDs separately can .
  • the LED modules 1, 2 for screen backlights presented in FIGS. 1 and 2 are connected in series.
  • Fig. 3 shows such a series ⁇ circuit of LED modules 21, 22, 23, 24 and 25.
  • the modules have the design of the LED module 2 of Fig. 2, each with two green LEDs. It can be seen that sämt- be Liehe modules with a single signal R with two Signa ⁇ len G and with a further signal B is driven.
  • Fig. 4 shows schematically the internal structure of the module 2 of Fig. 2.
  • a red light emitting diode LR is connected with its anode to the terminal Rl and with its cathode to the terminal R2.
  • the first green LED LG1 to the terminals Gl and G2 the second green LED LG2 to the terminals G3 and G4 and the blue LED LB to the terminals Bl and B2 on ⁇ closed.
  • the current through the respective LEDs is therefore primarily by the control signals R, G and B be ⁇ true.
  • one shunt transistor T1, T2, T3 and T4 is located parallel to each light-emitting diode. These are controlled in each case by amplifiers V1, V2, V3 and V4. Their drive signals receive the amplifiers V1 to V4 from comparators K1 to K4. Each of these comparators has a memory in which a specific adjustment value is stored. This memory value can be fed in via a data bus DB. The comparator compares this adjustment value with a current brightness value, which it receives via an amplifier V5 from a color sensor FS.
  • the color sensor FS is realized by a photodiode. A single photodiode, which generally measures the brightness, is sufficient because the individual diodes can be controlled separately for readjustment.
  • the power supply of the circuit of the LED module 2 and in particular of the comparators Kl to K4 is effected by the electrolytic capacitor C. It is fed via diodes Dl to D4 of the drive signals R, G, G, B.
  • diodes Dl to D4 of the drive signals R, G, G, B lie ⁇ gene, the anodes of the four diodes Dl through D4 at the terminals R2, G2, G4 and B2, and the cathodes of the diodes Dl to D4 to the corresponding electrode of the electrolytic capacitor C.
  • a temperature sensor TS is provided. In the present example this is realized by a temperature-dependent resistor. Its signal is used to control the amplifier V5. Subsequently, the adjustment and the readjustment of an LED module according to the invention, also called LED cluster, will be briefly described. Each LED module is calibrated after Her ⁇ position and then goes for example to egg nem screen manufacturers. The latter then uses the LED modules to produce the final BLU, which can then be adjusted to the desired color location with little effort. Due to the individual readjustment, punctual deviations that occur during the lifetime of the LED modules can be automatically compensated.
  • Each LED module has for automatic readjustment, as mentioned in connection with Fig. 4, via its own sensor FS and an integrated circuit comprising the components shown in Fig. 4.
  • This integrated circuit including sensors and LEDs is preferably on a common board mon ⁇ advantage.
  • the punctual readjustment takes place in that the color sensor, z.
  • a photodiode modeled after eye sensitivity detects the brightness of an LED, and the shunt transistor to which the LED is to be slewed may be opened a certain amount so that it bypasses a portion of the current at the LED. It can therefore be achieved in the context of readjustment, a reduction in the brightness of an affected LED.
  • the coupling of the light or color sensor FS to the LEDs can be done both indirectly and directly.
  • Indi ⁇ direct coupling of the color sensor FS on a LED module board 3 is shown schematically in Fig. 5.
  • the light of the LEDs L1, L2 is emitted in the direction of a diffuser 4 of a BLU. Part of the light is reflected back on the diffuser 4 to the color sensor FS.
  • the amount of reflected light is a measure of the luminosity of the respective light emitting diode Ll, L2.
  • the direct coupling of the color sensor FS to the light ⁇ diodes L3, L4 is shown schematically in Fig. 6.
  • Each of the LEDs L3 and L4 of the LED module board 5 is provided with a primary optics PO3, PO4.
  • a portion of the light that is a light emitting diode, z. B. L3, is diffracted at the primary optics PO3 and directed directly to the color sensor FS2.
  • the diffuser 6 plays no role or only a minor role in this direct coupling.
  • the direct coupling of the color sensor to the LEDs can also be done via a light guide, which directs the light directly to the sensor.
  • current diversion through a shunt transistor is no more than about 10 percent. As a result, overheating of the IC or excessive drop in efficiency can be avoided.
  • the individually measured modules or clusters make it easy for the user to assemble a BLU.
  • the color location with an impressed PWM signal then remains stable over the lifetime and the temperature.
  • the user does not have to have any special knowledge about the color temperature readjustment.
  • Another advantage of the LED modules shown by way of example is that their wiring complexity is relatively low.
  • the supply of the individual integrated circuits on the modules takes place separately, and the energy ⁇ absorption elements for the components is obtained from the An ⁇ control signals, which also reduces the circuit cost.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The quality of the readjustment of LED backlights for screens is intended to be improved. For this purpose, provision is made for using a sensor (FS, TS) to detect a physical quantity in the LED module (2), in particular the brightness of an LED (LR, LG1, LG2, LB) or the temperature. The drive current through the respective LED is then changed depending on the at least one physical quantity detected. The colour of an LED module can thus be kept stable over the course of the life time.

Description

Beschreibung description
LED-Modul mit eigener Farbregelung und entsprechendes VerfahrenLED module with its own color control and corresponding procedure
Technisches GebietTechnical area
Die vorliegende Erfindung betrifft ein LED-Modul zur Hin- terleuchtung eines Bildschirms mit mindestens einer LED. Darüber hinaus betrifft die vorliegende Erfindung ein Verfahren zur Hinterleuchtung eines Bildschirms durch Ansteuern mehrerer LED-Module mit einem vorgebbaren Strom.The present invention relates to an LED module for backlighting a screen with at least one LED. Moreover, the present invention relates to a method for backlighting a screen by driving a plurality of LED modules with a predetermined current.
Stand der TechnikState of the art
Die Hinterleuchtung von LCD-Bildschirmen erfolgt in der Regel mithilfe von LEDs. Mehrere LED-Module werden hierzu zusammengeschaltet und betrieben. Dabei werden die LED- Module in Reihe geschaltet. Jedes Modul besitzt in der Regel eine blaue, eine rote und eine oder zwei grüne LEDs. Diese Reihen sind dann wieder parallel angeordnet, um eine gleichmäßige Ausleuchtung des Bildschirmes zu er- reichen.The backlighting of LCD screens is usually done using LEDs. Several LED modules are interconnected and operated for this purpose. The LED modules are connected in series. Each module usually has one blue, one red and one or two green LEDs. These rows are then again arranged in parallel in order to achieve a uniform illumination of the screen.
Die Lichtausbeute von LEDs und insbesondere von Hoch¬ leistungs-LEDs ändert sich mit der Lebensdauer und in Ab¬ hängigkeit von der Temperatur. Damit ergibt sich eine ständige Änderung des Emissionsspektrums bzw. des Far- borts (Hauptemissionslinie) auf einer Wellenlängen- oder Frequenzskala. Diese Änderung ist grundsätzlich unerwünscht und führt, wenn die LEDs zur Hinterleuchtung von LCD-Bildschirmen Verwendung finden, zu farblich nicht korrekter Darstellung von stehenden und bewegten Bildern. Diese Farbstörungen können sowohl flächig als auch punk- tuell auftreten. Bislang werden Hinterleuchtungen für Bildschirme in der Gesamtheit oder zeilenweise hinsichtlich ihrer Farbe und ihrem Weißpunkt nachgeregelt. Die endgültige Einstellung und der Abgleich erfolgen nach der Vormontage der Hinter- leuchtungseinheiten (BLU; Back Light Unit) im Werk. Gegebenenfalls erfolgt eine automatische Nachführung der Far¬ be im Betrieb, indem eben der gesamte Bildschirm bzw. die einzelnen Zeilen nachgeführt werden. Dies führt jedoch nicht immer zu qualitativ hochwertigen Resultaten.The light output of LEDs and in particular of high-power LEDs ¬ changes with the life and from ¬ dependence on temperature. This results in a constant change of the emission spectrum or of the color (main emission line) on a wavelength or frequency scale. This change is basically undesirable and leads, when the LEDs are used for backlighting of LCD screens, to incorrect color representation of still and moving images. These color disturbances can occur both areally and punctually. So far backlighting for screens in the whole or line by line with respect to their color and their white point are readjusted. The final adjustment and adjustment are made after the pre-assembly of the back light unit (BLU) at the factory. Optionally, an automatic tracking of the Far ¬ be in operation by just the entire screen or the individual lines are tracked. However, this does not always lead to high quality results.
Darstellung der ErfindungPresentation of the invention
Die Aufgabe der vorliegenden Erfindung besteht somit darin, die Qualität der Nachregelung von Hinterleuchtungen eines Bildschirms zu verbessern.The object of the present invention is thus to improve the quality of the readjustment of backlighting of a screen.
Erfindungsgemäß wird diese Aufgabe gelöst durch ein LED- Modul zur Hinterleuchtung eines Bildschirms mit mindes- tens einer LED, einer Sensoreinrichtung zur Erfassung mindestens einer physikalischen Größe und einer Ansteuereinrichtung zum Ansteuern der mindestens einen LED in Abhängigkeit eines Signals der Sensoreinrichtung.According to the invention, this object is achieved by an LED module for backlighting a screen with at least one LED, a sensor device for detecting at least one physical variable and a drive device for driving the at least one LED in response to a signal of the sensor device.
Darüber hinaus wird erfindungsgemäß bereitgestellt ein Verfahren zum Nachregeln eines LED-Moduls zur Hinterleuchtung eines Bildschirms durch Ansteuern mindestens einer LED des LED-Moduls mit einem vorgegebenen Strom, Erfassen mindestens einer physikalischen Größe des LED- Moduls beim Fluss des vorgegebenen Stroms durch die LED und Ändern des Stroms durch die LED in Abhängigkeit von der mindestens einen erfassten physikalischen Größe.In addition, the invention provides a method for readjusting an LED module for backlighting a screen by driving at least one LED of the LED module with a predetermined current, detecting at least one physical size of the LED module in the flow of the predetermined current through the LED and changing the current through the LED as a function of the at least one detected physical quantity.
In vorteilhafter Weise ist es somit möglich, dass jedes einzelne LED-Modul automatisch nachgeregelt wird, wenn sich seine Farbe im Laufe des Betriebs ändert. Dadurch kann auf lange Zeit eine sehr gleichmäßige und konstante Hinterleuchtung gewährleistet werden.Advantageously, it is thus possible that each individual LED module is readjusted automatically, if its color changes during operation. As a result, a very uniform and constant backlighting can be guaranteed for a long time.
Vorzugsweise umfasst die Sensoreinrichtung einen Farbsen- sor, um Farbänderungen der mindestens einen LED festzustellen. Insbesondere kann der Farbsensor ein V (λ) -Sensor sein, der der Augenempfindlichkeit nachempfunden ist. Der Farbsensor kann aber auch dadurch realisiert werden, dass einfach ein Helligkeitssensor verwendet wird und die LEDs unterschiedlicher Farbe nacheinander hinsichtlich ihrer Leuchtstärke überprüft werden. Dadurch ergibt sich indi¬ rekt eine Detektion der Farbintensität.Preferably, the sensor device comprises a color sensor to detect color changes of the at least one LED. In particular, the color sensor may be a V (λ) sensor that is modeled on the eye sensitivity. However, the color sensor can also be realized by simply using a brightness sensor and checking the LEDs of different colors successively with regard to their luminosity. This results indi ¬ rectly detection of the color intensity.
Alternativ oder zusätzlich kann die Sensoreinrichtung auch einen Temperatursensor umfassen, um eine Temperatur des LED-Moduls festzustellen. Dadurch können Helligkeits¬ schwankungen der LEDs, die sich durch Temperaturänderungen ergeben, ausgeglichen werden.Alternatively or additionally, the sensor device may also include a temperature sensor to detect a temperature of the LED module. This allows the brightness of the LEDs ¬ fluctuations that arise due to temperature changes are compensated for.
Entsprechend einer weiteren Ausführungsform der vorliegenden Erfindung kann die Ansteuereinrichtung einen Spei- eher zum Speichern eines Abgleichwerts und einen Kompara- tor zum Vergleichen eines aktuellen Signals der Sensoreinrichtung mit dem Abgleichwert umfassen. Mit diesen Komponenten kann einfach eine Farbnachführung mit vorgegebenen Werten erreicht werden.According to another embodiment of the present invention, the drive means may comprise a memory for storing a trim value and a comparator for comparing a current signal of the sensor device with the trim value. With these components it is easy to achieve a color correction with preset values.
Besonders vorteilhaft ist darüber hinaus, wenn parallel zu der mindestens einen LED ein von der Ansteuereinrichtung gesteuerter Shunt-Transistor geschaltet ist, um den durch die LED fließenden Strom in Abhängigkeit von der erfassten physikalischen Größe zu reduzieren. Hierdurch kann selbst in einer Reihenschaltung von mehreren LEDs eine unterschiedliche Leuchtstärke der einzelnen Leucht¬ körper erreicht werden.In addition, it is particularly advantageous if, in parallel with the at least one LED, a shunt transistor controlled by the drive device is connected in order to reduce the current flowing through the LED as a function of the detected physical variable. As a result, even in a series circuit of multiple LEDs a different luminous intensity of the individual light ¬ body can be achieved.
Darüber hinaus kann die mindestens eine LED mit der Sen¬ soreinrichtung und der Ansteuereinrichtung auf einer ge- meinsamen Platine, insbesondere einer Metallkernplatine, angeordnet und verschaltet sein. Damit lässt sich das ge¬ samte LED-Modul einfach und gegebenenfalls auch automa¬ tisch zu einer Anordnung einer Hinterleuchtungseinheit verarbeiten .In addition, the at least one LED with the Sen ¬ soreinrichtung and the driving device on of a common circuit board, in particular a metal core board can be arranged and interconnected. This means that the entire ge ¬ LED module can be easily and optionally also automatic ¬ table process to an arrangement of a backlight.
Ferner ist es günstig, wenn die Ansteuereinrichtung eine Datenschnittstelle aufweist. Über diese Schnittstelle können Abgleichwerte beim Abgleich im Rahmen der Vormontage in gewünschter Weise in die LED-Module eingegeben werden .Furthermore, it is favorable if the drive device has a data interface. Adjustment values can be entered in the desired manner in the LED modules during adjustment during pre-assembly via this interface.
Entsprechend einer weiteren bevorzugten Ausführungsform besitzt das LED-Modul mehrere LEDs, die durch die Ansteu¬ ereinrichtung unabhängig voneinander ansteuerbar sind. Damit kann die Nachführung jeder LED auf dem LED-Modul individuell erfolgen.According to a further preferred embodiment, the LED module has a plurality of LEDs, which are independently controllable by the Ansteu ¬ ereinrichtung. Thus, the tracking of each LED on the LED module can be done individually.
Wie bereits angedeutet wurde, lassen sich mehrere LED- Module der genannten Art zu einer Hinterleuchtungsvor- richtung für einen Bildschirm zusammenschalten, wobei die mehreren LED-Module in Reihe miteinander verbunden sind.As has already been indicated, a plurality of LED modules of the type mentioned can be interconnected to form a backlighting device for a screen, wherein the plurality of LED modules are connected in series with one another.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die vorliegende Erfindung wird nun anhand der beigefüg- ten Zeichnungen näher erläutert, in denen zeigen:The present invention will now be explained in more detail with reference to the accompanying drawings, in which:
Fig. 1 die äußere Verschaltung eines RGB-LED-Moduls; Fig. 2 die äußere Verschaltung eines RGGB-Moduls;1 shows the external interconnection of a RGB LED module. 2 shows the external interconnection of an RGGB module;
Fig. 3 eine Reihenschaltung mehrerer LED-Module gemäß Fig. 2;FIG. 3 shows a series connection of a plurality of LED modules according to FIG. 2; FIG.
Fig. 4 den inneren Aufbau eines LED-Moduls gemäß Fig. 2;4 shows the internal structure of an LED module according to FIG. 2;
Fig. 5 einen Querschnitt durch ein LED-Modul mit indirek¬ ter, optischer Ankopplung des Sensors undFig. 5 is a cross sectional view of a LED module with indirek ¬ ter, optical coupling of the sensor and
Fig. 6 einen Querschnitt durch ein LED-Modul mit direk¬ ter, optischer Ankopplung des Sensors.Fig. 6 is a cross-sectional view of an LED module with a more ¬ ter, optical coupling of the sensor.
Bevorzugte Ausführungen der ErfindungPreferred embodiments of the invention
Die nachfolgend näher geschilderten Ausführungsformen stellen bevorzugte Ausführungsbeispiele der vorliegenden Erfindung dar.The embodiments described in more detail below represent preferred embodiments of the present invention.
Das in Fig. 1 wiedergegebene LED-Modul 1 besitzt zwei An¬ schlüsse Rl und R2, zwischen die eine rote LED geschlos¬ sen ist. Beispielsweise ist der Anschluss Rl an die Anode der roten LED und der Anschluss R2 an die Kathode der ro¬ ten LED angeschlossen. An den Anschluss Rl wird ein Ansteuersignal R, insbesondere ein PWM-Signal (Pulse Width Modulation) zur Steuerung der roten LED angelegt. Der Betriebsstrom für die rote LED verlässt das LED-Modul 1 im vorliegenden Beispiel an dem Anschluss R2.The reproduced in Fig. 1 LED module 1 has two An ¬ connections Rl and R2, between which a red LED is closed ¬ sen. For example, the terminal Rl is connected to the anode of the red LED and the terminal R2 to the cathode of the ro ¬ th LED. At the terminal Rl a drive signal R, in particular a PWM signal (Pulse Width Modulation) is applied to control the red LED. The operating current for the red LED leaves the LED module 1 in the present example at the port R2.
In gleicher Weise ist eine grüne LED in dem LED-Modul 1 an die beiden Anschlüsse Gl und G2 angeschlossen und wird durch ein Ansteuersignal G angesteuert. Ebenso wird eine blaue LED in dem LED-Modul 1 über die Anschlüsse Bl und B2 mit einem Ansteuersignal B betrieben. Weiterhin ist das LED-Modul 1 über einen Anschluss M an Masse gelegt. Außerdem wird das LED-Modul 1 mithilfe ei¬ nes Elektrolytkondensators C mit Gleichstrom versorgt. Dieser wird intern durch Gleichrichten von Teilen der An- Steuersignale R, G, B mit Energie versorgt.In the same way, a green LED in the LED module 1 is connected to the two terminals Gl and G2 and is driven by a drive signal G. Likewise, a blue LED is operated in the LED module 1 via the terminals Bl and B2 with a drive signal B. Furthermore, the LED module 1 is connected via a terminal M to ground. In addition, the LED module 1 is ei ¬ nes electrolytic capacitor C supplied with direct current using. This is powered internally by rectifying parts of the on control signals R, G, B with energy.
Aus Gründen der Leuchtstärke grüner LEDs ist es vielfach notwendig, in einem LED-Modul 2 zwei grüne LEDs vorzuse¬ hen, wie dies in Fig. 2 angedeutet ist. Der prinzipielle Aufbau des LED-Moduls 2 entspricht dem LED-Moduls 1 von Fig. 1. In dem LED-Modul 2 sind für die beiden grünen LEDs lediglich zwei weitere Anschlüsse G3 und G4 vorgese¬ hen, um die beiden grünen LEDs getrennt ansteuern zu können .For reasons of luminosity green LEDs, it is often necessary in a LED module 2 vorzuse ¬ hen two green LEDs, as indicated in Fig. 2. The basic structure of the LED module 2 corresponds to the LED module 1 of Fig. 1. In the LED module 2, only two further terminals G3 and G4 are vorgese ¬ hen for the two green LEDs, to control the two green LEDs separately can .
Typischerweise werden die in den Figuren 1 und 2 vorge- stellten LED-Module 1, 2 für Bildschirmhinterleuchtungen in Reihe geschaltet. Fig. 3 zeigt eine derartige Reihen¬ schaltung von LED-Modulen 21, 22, 23, 24 und 25. Die Module besitzen die Bauart des LED-Moduls 2 von Fig. 2 mit jeweils zwei grünen LEDs. Es ist zu erkennen, dass sämt- liehe Module mit einem einzigen Signal R, mit zwei Signa¬ len G und mit einem weiteren Signal B angesteuert werden.Typically, the LED modules 1, 2 for screen backlights presented in FIGS. 1 and 2 are connected in series. Fig. 3 shows such a series ¬ circuit of LED modules 21, 22, 23, 24 and 25. The modules have the design of the LED module 2 of Fig. 2, each with two green LEDs. It can be seen that sämt- be Liehe modules with a single signal R with two Signa ¬ len G and with a further signal B is driven.
Fig. 4 zeigt nun schematisch den internen Aufbau des Moduls 2 von Fig. 2. Eine rote Leuchtdiode LR ist mit ihrer Anode an den Anschluss Rl und mit ihrer Kathode an den Anschluss R2 angeschlossen. So ist auch die erste grüne Leuchtdiode LGl an die Anschlüsse Gl und G2, die zweite grüne Leuchtdiode LG2 an die Anschlüsse G3 und G4 sowie die blaue Leuchtdiode LB an die Anschlüsse Bl und B2 an¬ geschlossen. Der Strom durch die jeweiligen Leuchtdioden wird also primär durch die Steuersignale R, G und B be¬ stimmt .Fig. 4 shows schematically the internal structure of the module 2 of Fig. 2. A red light emitting diode LR is connected with its anode to the terminal Rl and with its cathode to the terminal R2. Thus, the first green LED LG1 to the terminals Gl and G2, the second green LED LG2 to the terminals G3 and G4 and the blue LED LB to the terminals Bl and B2 on ¬ closed. The current through the respective LEDs is therefore primarily by the control signals R, G and B be ¬ true.
Parallel zu jeder Leuchtdiode liegt jeweils ein Shunttransistor Tl, T2, T3 und T4. Diese werden jeweils durch Verstärker Vl, V2, V3 und V4 angesteuert. Ihre Ansteuersignale erhalten die Verstärker Vl bis V4 von Kom- paratoren Kl bis K4. Jeder dieser Komparatoren besitzt einen Speicher, in dem ein jeweils spezifischer Abgleichwert gespeichert ist. Dieser Speicherwert ist über einen Datenbus DB einspeisbar. Der Komparator vergleicht diesen Abgleichwert mit einem aktuellen Helligkeitswert, den er über einen Verstärker V5 von einem Farbsensor FS erhält. Im vorliegenden Beispiel ist der Farbsensor FS durch eine Fotodiode realisiert. Eine einzige Fotodiode, die gene- rell die Helligkeit misst, reicht aus, da zum Nachregeln die einzelnen Dioden separat angesteuert werden können.In each case one shunt transistor T1, T2, T3 and T4 is located parallel to each light-emitting diode. These are controlled in each case by amplifiers V1, V2, V3 and V4. Their drive signals receive the amplifiers V1 to V4 from comparators K1 to K4. Each of these comparators has a memory in which a specific adjustment value is stored. This memory value can be fed in via a data bus DB. The comparator compares this adjustment value with a current brightness value, which it receives via an amplifier V5 from a color sensor FS. In the present example, the color sensor FS is realized by a photodiode. A single photodiode, which generally measures the brightness, is sufficient because the individual diodes can be controlled separately for readjustment.
Die Stromversorgung der Schaltung des LED-Moduls 2 und insbesondere der Komparatoren Kl bis K4 erfolgt durch den Elektrolytkondensator C. Er wird über Dioden Dl bis D4 von den Ansteuersignalen R, G, G, B gespeist. Hierzu lie¬ gen die Anoden der vier Dioden Dl bis D4 an den Anschlüssen R2, G2, G4 und B2 und die Kathoden der Dioden Dl bis D4 an der entsprechenden Elektrode des Elektrolytkondensators C.The power supply of the circuit of the LED module 2 and in particular of the comparators Kl to K4 is effected by the electrolytic capacitor C. It is fed via diodes Dl to D4 of the drive signals R, G, G, B. For this purpose lie ¬ gene, the anodes of the four diodes Dl through D4 at the terminals R2, G2, G4 and B2, and the cathodes of the diodes Dl to D4 to the corresponding electrode of the electrolytic capacitor C.
Da die Helligkeit der einzelnen Leuchtdioden, aber auch deren Farbort auf der Wellenlängenskala von der Tempera¬ tur abhängt, ist in dem LED-Modul 2 auch ein Temperatursensor TS vorgesehen. Im vorliegenden Beispiel ist dieser durch einen temperaturabhängigen Widerstand realisiert. Sein Signal dient zur Steuerung des Verstärkers V5. Nachfolgend wird kurz der Abgleich und die Nachregelung eines erfindungsgemäßen LED-Moduls, auch LED-Cluster genannt, beschrieben. Jedes LED-Modul wird nach der Her¬ stellung abgeglichen und geht dann beispielsweise an ei- nem Bildschirm-Hersteller. Dieser fertigt dann mit den LED-Modulen die endgültige BLU, die dann mit geringem Aufwand auf den gewünschten Farbort eingestellt werden kann. Durch die einzelne Nachregelung können punktuelle Abweichungen, die sich während der Lebensdauer der LED- Module ergeben, automatisch ausgeregelt werden.Since the brightness of the individual LEDs, but also their color locus on the wavelength scale is dependent on the tempera ture ¬, in the LED module 2, a temperature sensor TS is provided. In the present example this is realized by a temperature-dependent resistor. Its signal is used to control the amplifier V5. Subsequently, the adjustment and the readjustment of an LED module according to the invention, also called LED cluster, will be briefly described. Each LED module is calibrated after Her ¬ position and then goes for example to egg nem screen manufacturers. The latter then uses the LED modules to produce the final BLU, which can then be adjusted to the desired color location with little effort. Due to the individual readjustment, punctual deviations that occur during the lifetime of the LED modules can be automatically compensated.
Jedes LED-Modul verfügt zur automatischen Nachregelung, wie im Zusammenhang mit Fig. 4 erwähnt, über einen eigenen Sensor FS und über eine integrierte Schaltung, die die in Fig. 4 dargestellten Bauelemente umfasst. Diese integrierte Schaltung einschließlich der Sensoren und LEDs ist vorzugsweise auf einer gemeinsamen Platine mon¬ tiert. Die punktuelle Nachregelung erfolgt dadurch, dass der Farbsensor, z. B. eine der Augenempfindlichkeit nachempfundene Fotodiode, die Helligkeit einer LED erfasst, und der zu der nachzuregelnden LED liegende Shunt- Transistor gegebenenfalls ein gewisses Maß geöffnet wird, so dass er einen Teil des Stroms an der LED vorbeileitet. Es kann also im Rahmen der Nachregelung eine Reduktion der Helligkeit einer betroffenen LED erreicht werden.Each LED module has for automatic readjustment, as mentioned in connection with Fig. 4, via its own sensor FS and an integrated circuit comprising the components shown in Fig. 4. This integrated circuit including sensors and LEDs is preferably on a common board mon ¬ advantage. The punctual readjustment takes place in that the color sensor, z. For example, a photodiode modeled after eye sensitivity detects the brightness of an LED, and the shunt transistor to which the LED is to be slewed may be opened a certain amount so that it bypasses a portion of the current at the LED. It can therefore be achieved in the context of readjustment, a reduction in the brightness of an affected LED.
Die Ankopplung des Licht- bzw. Farbsensors FS an die LEDs kann sowohl indirekt als auch direkt erfolgen. Die indi¬ rekte Ankopplung des Farbsensors FS auf einer LED-Modul- Platine 3 ist in Fig. 5 schematisch dargestellt. Das Licht der LEDs Ll, L2 wird in Richtung auf eine Streu- scheibe 4 einer BLU abgestrahlt. Ein Teil des Lichts wird an der Streuscheibe 4 zurück an den Farbsensor FS reflek- tiert. Die Menge des reflektierten Lichts ist ein Maß für die Leuchtstärke der jeweiligen Leuchtdiode Ll, L2.The coupling of the light or color sensor FS to the LEDs can be done both indirectly and directly. Indi ¬ direct coupling of the color sensor FS on a LED module board 3 is shown schematically in Fig. 5. The light of the LEDs L1, L2 is emitted in the direction of a diffuser 4 of a BLU. Part of the light is reflected back on the diffuser 4 to the color sensor FS. advantage. The amount of reflected light is a measure of the luminosity of the respective light emitting diode Ll, L2.
Die direkte Ankopplung des Farbsensors FS an die Leucht¬ dioden L3, L4 ist in Fig. 6 schematisch wiedergegeben. Jede der Leuchtdioden L3 und L4 der LED-Modul-Platine 5 ist mit einer Primäroptik PO3, PO4 versehen. Ein Teil des Lichts, das eine Leuchtdiode, z. B. L3, verlässt, wird an der Primäroptik PO3 gebeugt und direkt auf den Farbsensor FS2 gelenkt. Die Streuscheibe 6 spielt bei dieser direk- ten Ankopplung keine oder nur eine untergeordnete Rolle. Die direkte Ankopplung des Farbsensors an die LEDs kann aber auch über einen Lichtleiter erfolgen, der das Licht direkt auf den Sensor leitet.The direct coupling of the color sensor FS to the light ¬ diodes L3, L4 is shown schematically in Fig. 6. Each of the LEDs L3 and L4 of the LED module board 5 is provided with a primary optics PO3, PO4. A portion of the light that is a light emitting diode, z. B. L3, is diffracted at the primary optics PO3 and directed directly to the color sensor FS2. The diffuser 6 plays no role or only a minor role in this direct coupling. The direct coupling of the color sensor to the LEDs can also be done via a light guide, which directs the light directly to the sensor.
Günstigerweise beträgt die Stromumleitung durch einen Shunt-Transistor nicht mehr als etwa 10 Prozent. Dadurch kann eine zu starke Erwärmung des ICs bzw. ein zu starkes Absinken der Effizienz vermieden werden.Conveniently, current diversion through a shunt transistor is no more than about 10 percent. As a result, overheating of the IC or excessive drop in efficiency can be avoided.
Durch die einzeln vermessenen Module bzw. Cluster ist es dem Anwender einfach möglich, eine BLU zusammenzustellen. Der Farbort bei einem eingeprägten PWM-Signal bleibt dann auch im Laufe der Lebensdauer und der Temperatur stabil. Damit muss der Anwender keine speziellen Kenntnisse über die Farbtemperaturnachregelung besitzen. Ein weiterer Vorteil der beispielhaft dargestellten LED-Module besteht darin, dass ihr Verdrahtungsaufwand relativ gering ist. Außerdem erfolgt die Versorgung der einzelnen integrierten Schaltungen auf den Modulen separat, und die Energie¬ absorptionselemente für die Bauelemente wird aus den An¬ steuersignalen gewonnen, wodurch ebenfalls der Schal- tungsaufwand sinkt. The individually measured modules or clusters make it easy for the user to assemble a BLU. The color location with an impressed PWM signal then remains stable over the lifetime and the temperature. Thus, the user does not have to have any special knowledge about the color temperature readjustment. Another advantage of the LED modules shown by way of example is that their wiring complexity is relatively low. In addition, the supply of the individual integrated circuits on the modules takes place separately, and the energy ¬ absorption elements for the components is obtained from the An ¬ control signals, which also reduces the circuit cost.

Claims

Ansprüche claims
1. LED-Modul zur Hinterleuchtung eines Bildschirms mit1. LED module for backlighting a screen with
- mindestens einer LED (LR, LGl, LG2, LB), gekennzeichnet durch- At least one LED (LR, LGl, LG2, LB), characterized by
- eine Sensoreinrichtung zur Erfassung mindestens ei- ner physikalischen Größe unda sensor device for detecting at least one physical quantity and
- eine Ansteuereinrichtung zum Ansteuerung der mindestens einen LED (LR, LGl, LG2, LB) in Abhängigkeit eines Signals dera drive device for controlling the at least one LED (LR, LG1, LG2, LB) as a function of a signal of the
Sensoreinrichtung.Sensor device.
2. LED-Modul nach Anspruch 1, wobei die Sensoreinrichtung einen Farbsensor (FS) umfasst, um Farbänderungen der mindestens einen LED (LR, LGl, LG2, LB) festzustellen .2. LED module according to claim 1, wherein the sensor device comprises a color sensor (FS) to detect color changes of the at least one LED (LR, LGl, LG2, LB).
3. LED-Modul nach Anspruch 1 oder 2, wobei die Sensoreinrichtung einen Temperatursensor (TS) umfasst, um eine Temperatur des LED-Moduls (1, 2, 21 bis 25) festzustellen .3. LED module according to claim 1 or 2, wherein the sensor device comprises a temperature sensor (TS) to determine a temperature of the LED module (1, 2, 21 to 25).
4. LED-Modul nach einem der vorhergehenden Ansprüche, wobei die Ansteuereinrichtung einen Speicher zum Speichern eines Abgleichwerts und einen Komparator (Kl bis K4) zum Vergleichen eines aktuellen Signals der Sensoreinrichtung mit dem Abgleichwert umfasst.4. LED module according to one of the preceding claims, wherein the drive means comprises a memory for storing an adjustment value and a comparator (Kl to K4) for comparing a current signal of the sensor device with the adjustment value.
5. LED-Modul nach einem der vorhergehenden Ansprüche, wobei parallel zu dem mindestens einen LED (LR, LGl, LG2, LB) ein von der Ansteuereinrichtung gesteuerter Shunt-Transistor (Tl bis T4) geschaltet ist, um den durch die LED fließenden Strom in Abhängigkeit von der erfassten physikalischen Größe zu reduzieren.5. LED module according to one of the preceding claims, wherein parallel to the at least one LED (LR, LGI, LG2, LB) controlled by the drive means shunt transistor (Tl to T4) is connected to the to reduce the current flowing through the LED depending on the detected physical quantity.
6. LED-Modul nach einem der vorhergehenden Ansprüche, wobei die mindestens eine LED (LR, LGl, LG2, LB) mit der Sensoreinrichtung und der Ansteuereinrichtung auf einer gemeinsamen Platine (3, 5) angeordnet und ver¬ schaltet ist.6. LED module according to one of the preceding claims, wherein the at least one LED (LR, LGI, LG2, LB) with the sensor device and the drive means on a common board (3, 5) arranged and ver ¬ switches.
7. LED-Modul nach einem der vorhergehenden Ansprüche, wobei die Ansteuereinrichtung eine Datenschnittstelle (DB) aufweist.7. LED module according to one of the preceding claims, wherein the drive means comprises a data interface (DB).
8. LED-Modul nach einem der vorhergehenden Ansprüche, das mehrere LEDs (LR, LGl, LG2, LB) aufweist, die durch die Ansteuereinrichtung unabhängig voneinander ansteuerbar sind.8. LED module according to one of the preceding claims, which has a plurality of LEDs (LR, LGI, LG2, LB), which are independently controllable by the drive means.
9. Hinterleuchtungsvorrichtung für einen Bildschirm mit mehreren LED-Modulen (1, 2, 21 bis 25) gemäß einem der vorhergehenden Ansprüche, wobei die mehreren LED- Module in Reihe geschaltet sind.9. A backlighting device for a display screen with a plurality of LED modules (1, 2, 21 to 25) according to one of the preceding claims, wherein the plurality of LED modules are connected in series.
10. Verfahren zum Nachregeln eines LED-Moduls (1, 2, 21 bis 25) zur Hinterleuchtung eines Bildschirms durch,10. A method for readjusting an LED module (1, 2, 21 to 25) for the backlighting of a screen,
- Ansteuern mindestens einer LED (LR, LGl, LG2, LB) des LED-Modus mit einem vorgegebenen Strom, gekennzeichnet durch- Controlling at least one LED (LR, LGI, LG2, LB) of the LED mode with a predetermined current, characterized by
- Erfassen mindestens einer physikalischen Größe des LED-Moduls beim Fluss des vorgegebenen Stroms durch die LED und- Detecting at least one physical size of the LED module in the flow of the predetermined current through the LED and
- Ändern des Stroms durch die LED in Abhängigkeit von der mindestens einen erfassten physikalischen Größe.- Changing the current through the LED depending on the at least one detected physical quantity.
11. Verfahren nach Anspruch 10, wobei als physikalische Größe die Farbe und/oder die Temperatur erfasst wird. 11. The method according to claim 10, wherein the physical size of the color and / or the temperature is detected.
EP06830637A 2006-12-15 2006-12-15 Led module with dedicated colour regulation and corresponding method Withdrawn EP2102846A1 (en)

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KR20090094143A (en) 2009-09-03
US20100026193A1 (en) 2010-02-04
WO2008071235A1 (en) 2008-06-19
CN101536072B (en) 2012-07-11
US8587214B2 (en) 2013-11-19
CN101536072A (en) 2009-09-16

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