EP2217040B1 - Anzeigevorrichtung, Betriebsverfahren und Beleuchtungsvorrichtung - Google Patents

Anzeigevorrichtung, Betriebsverfahren und Beleuchtungsvorrichtung Download PDF

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Publication number
EP2217040B1
EP2217040B1 EP10152419A EP10152419A EP2217040B1 EP 2217040 B1 EP2217040 B1 EP 2217040B1 EP 10152419 A EP10152419 A EP 10152419A EP 10152419 A EP10152419 A EP 10152419A EP 2217040 B1 EP2217040 B1 EP 2217040B1
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EP
European Patent Office
Prior art keywords
light
demultiplexer
display device
pulse
pulse width
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.)
Active
Application number
EP10152419A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2217040A1 (de
Inventor
Dominik Heggen
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.)
e cue control GmbH
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e cue control GmbH
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Publication date
Application filed by e cue control GmbH filed Critical e cue control GmbH
Publication of EP2217040A1 publication Critical patent/EP2217040A1/de
Application granted granted Critical
Publication of EP2217040B1 publication Critical patent/EP2217040B1/de
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter 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]
    • H05B45/20—Controlling the colour of the light
    • 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

Definitions

  • a method of operating a display device is provided.
  • the problem to be solved is to provide a particularly power-saving method for operating a display device.
  • the invention relates to an operating method according to claim 1.
  • a display device is indicated. By means of the display device, it is possible, for example, to display the operating state of a connected device.
  • the display device can be part of an operating device by means of which the device can be operated and controlled by the user.
  • the display device comprises a pulse width modulation circuit.
  • the Pulse width modulation circuit generates a pulse width modulated signal.
  • the pulse width modulated signal has a switch-on time in which a connected device is supplied with power by the pulse width modulation circuit and a switch-off time during which the connected device is not supplied with current, for example.
  • the display device has a demultiplexer.
  • the demultiplexer comprises at least one signal input and at least two signal outputs.
  • the demultiplexer includes exactly one signal input and a plurality of signal outputs.
  • the demultiplexer includes more signal outputs than signal inputs.
  • the demultiplexer is connected to the pulse width modulation circuit at its signal input. That is, the pulse width modulated signal generated by the pulse width modulation circuit is impressed into the demultiplexer via the signal input.
  • the display device comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer. That is, the LEDs are powered by the demultiplexer with operating current.
  • the demultiplexer switches the input signal of the pulse width modulation circuit to one of the signal outputs, which is connected to a light emitting diode. This way will then this LED is energized with the pulse width modulated signal.
  • the display device comprises a pulse width modulation circuit and a demultiplexer which has at least one signal input and at least two signal outputs, the signal input being connected to the pulse width modulation circuit.
  • the display device further comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer.
  • a display device which is intended to display the operating state of, for example, several connected devices may have a multiplicity of light-emitting diodes for displaying the operating state. If all LEDs of the display device are energized at the same time, then the display device has a relatively high power consumption.
  • the display device described here is based inter alia on the recognition that - due to the inertia of the human eye - the light emitting diodes of the display device does not necessarily have to be operated simultaneously to give the viewer the impression that they light up at the same time. Rather, it is sufficient to operate only one of the light-emitting diodes, while the remaining light-emitting diodes are not energized.
  • the viewer gets the impression that all the LEDs of the display device light up at the same time. In actual fact, however, only one LED lights up in each case, the power consumption is reduced to one nth of the power consumption, which would have the display device when all the LEDs are operated simultaneously, where n is the number of LEDs of the display device.
  • the demultiplexer has a control input which is connected to a control input of the pulse width modulation circuit.
  • demultiplexer and pulse width modulation circuit are synchronized with each other. In this way, it can be ensured, for example, that each light-emitting diode of the display device is operated with the pulse-width-modulated signal intended for it. Furthermore, it can be ensured that the demultiplexer is switched from one signal output to the next, that is to say from one light-emitting diode to the next, in the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when turning on the LEDs can be avoided.
  • each of the light-emitting diodes of the display device comprises at least two light-emitting diode chips.
  • each light-emitting diode comprises a light-emitting diode chip emitting red light, a green light-emitting light-emitting diode chip, and a blue light-emitting light-emitting diode chip.
  • Each LED chip is with a Signal output of the demultiplexer one-uniquely connected. That is, each signal output of the demultiplexer is associated with exactly one LED chip in this embodiment, and each LED chip is associated with exactly one signal output of the demultiplexer. In this way, it is possible that the LED chips of a light emitting diode can be operated independently. Thus, for example, by means of RGB LEDs, a specific color location of the light generated by the light emitting diode can be set.
  • the power consumption of the display device is at most 0.5 W.
  • the display device comprises eight or more light-emitting diodes. This is made possible in particular by the fact that the LEDs of the display device are not operated simultaneously, but sequentially.
  • a method for operating a display device having at least two light-emitting diodes is provided.
  • the display device may be, for example, a display device described here. That is, all features described in connection with the display device are also disclosed in connection with the method for operating a display device, and vice versa.
  • the method has the method step, after which a pulse-width-modulated signal is generated which has a switch-on time and a switch-off time.
  • the pulse-width-modulated signal has a multiplicity of switch-on times and switch-off times which, for example, follow one another periodically.
  • the at least two light emitting diodes are operated by means of the pulse width modulated signal.
  • one of the light-emitting diodes is then energized in forward voltage, in the switch-off time, the light-emitting diode is not energized, or it is energized with a low current in the reverse direction.
  • the pulse width modulated signal is generated by means of a pulse width modulation circuit.
  • the method comprises the method step, after which the pulse width modulated signal is passed to a demultiplexer.
  • a signal output of the pulse width modulation circuit is connected to a signal input of the demultiplexer.
  • the method comprises a method step in which the pulse width modulation circuit and the demultiplexer are synchronized, such that the pulse width modulated signal is passed from the demultiplexer to a light emitting diode from the at least two light emitting diodes during a turn off time. That is, the demultiplexer sequentially switches, for example, the LEDs of the display device and connects them each with one of its signal outputs. The switching from one light-emitting diode to another light-emitting diode preferably takes place during the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when switching from one LED to the next can be avoided.
  • no flashes of light occur between the switching from one light-emitting diode to the next light-emitting diode.
  • the next light-emitting diode is switched on in time only after the switching by the pulse-width-modulated signal and not during the switching from the previous light-emitting diode to the next light-emitting diode.
  • At least one of the light-emitting diodes has at least two light-emitting diode chips.
  • all of the light-emitting diodes of the display device are so-called RGB light-emitting diodes, each of which comprises a red light, a blue light and a green light-emitting light-emitting diode chip.
  • Per LED chip is doing a pulse width modulated signal to the LED passed.
  • the pulse width modulation circuit is suitable, for example, for simultaneously generating three different pulse width modulated signals.
  • the light-emitting diode chips of the light-emitting diode can be operated sequentially. That is, the demultiplexer not only switches between the individual LEDs, but between the individual LED chips. In this way, the display device can be operated particularly energy-saving, since only a single LED chip is energized at a certain time.
  • the pulse-width-modulated signal is conducted by the demultiplexer sequentially to the at least two light-emitting diodes. That is, the LEDs of the display device are sequentially operated one by one, and none of the LEDs of the display device is operated at the same time as another LED of the display device. It is, as just stated, also possible that the LED chips of the LEDs are also operated individually.
  • the light-emitting diode chips of the at least two light-emitting diodes of the display device are each operated at the maximum permissible current intensity during the turn-on time of the pulse-width-modulated signal. Due to the sequential operation of the light-emitting diodes and / or the light-emitting diode chips of the display device, the light generated by the light-emitting diodes overall seems less bright than when all the light-emitting diodes are operated simultaneously.
  • the LEDs are operated during the short time they are operated at the maximum allowable for them current. Since the operation of the light-emitting diodes or the LED chips always takes place only briefly, thereby the life of the light-emitting diodes is hardly or not negatively influenced. On the other hand, the brightness loss due to the sequential operation by this measure can be compensated so strong that the viewer is hardly a decrease in brightness is detected.
  • a lighting device and a display device.
  • this is a display device described here, so that all features described in connection with the display device are also disclosed in connection with the lighting device.
  • the lighting device comprises, in addition to the display device, at least one lamp which is connected to the display device, wherein the display device is provided to indicate an operating state of the at least one lamp. It is possible the display device displays, for example, the following properties of the light generated by the lamp: color location, color temperature and / or brightness.
  • the FIG. 1 shows a schematic representation of a first embodiment of a display device described here.
  • the display device comprises a pulse width modulation circuit 1.
  • the pulse width modulation circuit 1 has a signal output 12 and a control input 13.
  • the pulse width modulation circuit 1 generates a pulse width modulated signal 10.
  • the pulse width modulated signal 10 has switch-on times t1 and switch-off times t2.
  • the pulse width modulated signal 10 is formed in the manner of a rectangular pulse.
  • the display device further comprises a demultiplexer 2.
  • the demultiplexer 2 has a signal input 21. Further the demultiplexer 2 has a multiplicity of signal outputs 22. Finally, the demultiplexer has a control input 23.
  • the pulse width modulation circuit 1 and the demultiplexer 2 are connected to each other via the signal output 12 of the pulse width modulation circuit 1 and the signal input 21 of the demultiplexer 2.
  • the display device furthermore has a multiplicity of light-emitting diodes 3.
  • the light-emitting diodes 3 are RGB light-emitting diodes which have three light-emitting diode chips 30, one of which generates red, one blue and one green light during operation.
  • Each of the light-emitting diode chips 30 is uniquely connected to the demultiplexer 2 via the signal outputs 22. That is, the number of signal outputs 22 corresponds, for example, three times the number of LEDs 3 of the display device.
  • a pulse width modulated signal 10 is generated by the pulse width modulation circuit 1.
  • the pulse width modulated signal 10 is impressed by the signal input 21 in the demultiplexer 2, which switches the pulse width modulated signal 10 to exactly one of its signal outputs 22, so that a switched pulse width modulated signal 20 is sent to one of the LED chips 30.
  • the demultiplexer 2 and the pulse width modulation circuit 1 are synchronized with each other, so that the switching from a light-emitting diode chip 30 to the next light-emitting diode chip 30 takes place during the turn-off time t2. In this way, an unpleasant flash of the LED chips 30 during the switching process is prevented.
  • the LED chips 30 are successively, that is, sequentially applied in rapid succession each with a pulse width modulated signal, so that the switching of the observer due to the inertia of the human eye is not noticeable.
  • the pulse width modulation circuit 1 generates a plurality of pulse width modulated signals 10, wherein the number of signals 10 corresponds to the number of light-emitting diode chip 30 per LED.
  • the light-emitting diode chips 30 of a single light-emitting diode can each be operated simultaneously, so that a sequential switching does not take place between individual light-emitting diode chips but between individual light-emitting diodes.
  • the FIG. 2 shows a display device 100, as for example in connection with the FIG. 1 is explained in more detail.
  • the display device 100 comprises twelve individual light-emitting diodes 3, which are each arranged behind a viewing window 140.
  • the display device comprises a control panel 31, on which operating elements 120 are arranged, which can be activated by touching the control panel 31.
  • the control panel 31 is a glass surface, behind which capacitive switches are arranged in the region of the control elements 120.
  • An operating arrangement with such a control panel is for example in the publications DE 10 2005 059 067 A1 and DE 10 2007 017 335 A1 explained in more detail.
  • the display device is connected to one or more lamps 200, which may each have a plurality of light-emitting diodes 201.
  • the operating state of the lamps 200 can be displayed.
  • each control element can be associated with exactly one lamp whose operating state is indicated by the light-emitting diode 3.

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Led Devices (AREA)
  • Control Of El Displays (AREA)
EP10152419A 2009-02-05 2010-02-02 Anzeigevorrichtung, Betriebsverfahren und Beleuchtungsvorrichtung Active EP2217040B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009007504A DE102009007504A1 (de) 2009-02-05 2009-02-05 Anzeigevorrichtung, Betriebsverfahren und Beleuchtungsvorrichtung

Publications (2)

Publication Number Publication Date
EP2217040A1 EP2217040A1 (de) 2010-08-11
EP2217040B1 true EP2217040B1 (de) 2013-04-03

Family

ID=42091496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10152419A Active EP2217040B1 (de) 2009-02-05 2010-02-02 Anzeigevorrichtung, Betriebsverfahren und Beleuchtungsvorrichtung

Country Status (5)

Country Link
US (1) US8358219B2 (zh)
EP (1) EP2217040B1 (zh)
KR (1) KR20100090207A (zh)
CN (1) CN101800028B (zh)
DE (1) DE102009007504A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017102467A1 (de) 2017-02-08 2018-08-09 Osram Opto Semiconductors Gmbh Verfahren zum Betreiben einer lichtemittierenden Vorrichtung

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
US3983553A (en) * 1975-05-12 1976-09-28 General Motors Corporation Appliance remote touch-control panel with sound system
CA2063744C (en) * 1991-04-01 2002-10-08 Paul M. Urbanus Digital micromirror device architecture and timing for use in a pulse-width modulated display system
US5351685A (en) * 1991-08-05 1994-10-04 Nellcor Incorporated Condensed oximeter system with noise reduction software
AU667199B2 (en) * 1991-11-08 1996-03-14 Physiometrix, Inc. EEG headpiece with disposable electrodes and apparatus and system and method for use therewith
DE69721698T2 (de) * 1996-11-21 2004-03-25 Omron Corp. Verfahren und Vorrichtung zur Anzeige von Messgrössen
US6188181B1 (en) * 1998-08-25 2001-02-13 Lutron Electronics Co., Inc. Lighting control system for different load types
DE29816331U1 (de) * 1998-09-15 1998-12-10 Dambach Werke Gmbh Leuchtdiodenmatrix-Anzeigevorrichtung
US6217188B1 (en) * 1999-03-04 2001-04-17 Ani-Motion, Inc. Color changeable fiber-optic illuminated display
DE10140331C2 (de) * 2001-08-16 2003-11-06 Siemens Ag Lichtzeichen zur Verkehrssteuerung und Verfahren zur Funktionsüberwachung eines solchen Zeichens
DE102004003698B4 (de) 2004-01-24 2005-11-24 Preh Gmbh Schaltungsanordnung zur Ansteuerung von Leuchtmitteln
US20050269580A1 (en) * 2004-06-04 2005-12-08 D Angelo Kevin P Single wire serial protocol for RGB LED drivers
US20060261794A1 (en) * 2005-05-17 2006-11-23 May Marcus W Method & apparatus for DC-DC regulation with improved transient function
KR100661661B1 (ko) 2005-07-01 2006-12-26 삼성전자주식회사 디스플레이장치 및 그 제어방법
DE102005059067B4 (de) 2005-12-08 2014-07-10 FELA GmbH Kapazitive Tastatureinrichtung
KR20080073464A (ko) * 2007-02-06 2008-08-11 삼성전자주식회사 광원 구동 장치, 이를 구비한 디스플레이 장치 및 이들의구동 방법
DE202007010458U1 (de) 2007-04-11 2007-10-04 Fela Hilzinger Gmbh Leiterplattentechnik Beleuchtungseinheit mit einer transparenten Trägerplatte und daraufsitzender Leuchtdiode
US20090033612A1 (en) * 2007-07-31 2009-02-05 Roberts John K Correction of temperature induced color drift in solid state lighting displays
DE102007040111B3 (de) * 2007-08-24 2008-10-23 Siemens Ag Verfahren zur Inbetriebsetzung eines Beleuchtungssystems

Also Published As

Publication number Publication date
US20100194580A1 (en) 2010-08-05
KR20100090207A (ko) 2010-08-13
US8358219B2 (en) 2013-01-22
CN101800028B (zh) 2014-08-20
EP2217040A1 (de) 2010-08-11
CN101800028A (zh) 2010-08-11
DE102009007504A1 (de) 2010-08-12

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