EP2102846A1 - Module à del avec réglage de couleur propre et procédé correspondant - Google Patents

Module à del avec réglage de couleur propre et procédé correspondant

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Withdrawn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)
English (en)
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/fr
Withdrawn legal-status Critical Current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.

Landscapes

  • 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

La qualité de post-réglage de rétro-éclairages à DEL pour les écrans doit être améliorée. L'invention prévoit donc de détecter une grandeur physique dans le module à DEL (2) au moyen d'un capteur (FS, TS), en particulier la luminosité d'une DEL (LR, LG1, LG2, LB) et/ou la température. Le courant de commande à travers la DEL respective est alors modifié en fonction de la ou des grandeurs physiques détectées. Cela permet de maintenir la stabilité de la couleur d'un module à LED tout au long de sa durée de vie.
EP06830637A 2006-12-15 2006-12-15 Module à del avec réglage de couleur propre et procédé correspondant Withdrawn EP2102846A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/069741 WO2008071235A1 (fr) 2006-12-15 2006-12-15 Module à del avec réglage de couleur propre et procédé correspondant

Publications (1)

Publication Number Publication Date
EP2102846A1 true EP2102846A1 (fr) 2009-09-23

Family

ID=37810289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06830637A Withdrawn EP2102846A1 (fr) 2006-12-15 2006-12-15 Module à del avec réglage de couleur propre et procédé correspondant

Country Status (6)

Country Link
US (1) US8587214B2 (fr)
EP (1) EP2102846A1 (fr)
KR (1) KR20090094143A (fr)
CN (1) CN101536072B (fr)
TW (1) TW200832017A (fr)
WO (1) WO2008071235A1 (fr)

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US9013467B2 (en) 2013-07-19 2015-04-21 Institut National D'optique Controlled operation of a LED lighting system at a target output color
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Also Published As

Publication number Publication date
US8587214B2 (en) 2013-11-19
US20100026193A1 (en) 2010-02-04
TW200832017A (en) 2008-08-01
CN101536072A (zh) 2009-09-16
WO2008071235A1 (fr) 2008-06-19
KR20090094143A (ko) 2009-09-03
CN101536072B (zh) 2012-07-11

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