EP3170368A2 - Schaltungsanordnung und verfahren zur ansteuerung von leds in matrix-konfiguration - Google Patents
Schaltungsanordnung und verfahren zur ansteuerung von leds in matrix-konfigurationInfo
- Publication number
- EP3170368A2 EP3170368A2 EP15734316.1A EP15734316A EP3170368A2 EP 3170368 A2 EP3170368 A2 EP 3170368A2 EP 15734316 A EP15734316 A EP 15734316A EP 3170368 A2 EP3170368 A2 EP 3170368A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- leds
- bias
- led12
- circuit arrangement
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011159 matrix material Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 25
- 238000010168 coupling process Methods 0.000 claims abstract description 25
- 238000005859 coupling reaction Methods 0.000 claims abstract description 25
- 230000004913 activation Effects 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 description 10
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 102220479492 NAD(+) hydrolase SARM1_R22A_mutation Human genes 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 102220051077 rs145247495 Human genes 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Classifications
-
- 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
-
- 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]
-
- 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
- H05B44/00—Circuit arrangements for operating electroluminescent light sources
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
Definitions
- the invention relates to a circuit arrangement for driving light emitting diodes (Light Emitting Diodes, abbreviated LEDs) in a matrix configuration, wherein each LED of the matrix is individually activatable by activation of a corresponding column driver in connection with the activation of a corresponding row driver, wherein each further per line, a bias device having a first bias connection for electrically coupling to the cathodes of the LEDs of the respective row and having a second bias connection for electrical coupling to the anodes of the LEDs of the respective row.
- LEDs Light Emitting Diodes
- FIG. 1 represents a 2x2 matrix (two by two matrix).
- the blocking current flowing in this process causes the failure of LEDs as a result of material migration.
- Avoiding the blocking voltage in a matrix is sought in order to obtain the cost-effective matrix principle without reducing the lifetime.
- EP 1 916 880 B1 discloses a principle for solving the reverse voltage problem.
- FIG. 2 shows an equivalent circuit diagram with the solution proposed in EP 1 916 880 B1 on a 2 ⁇ 2 matrix. If the LED 1 1 is driven, falls on it, for example, a forward voltage of 3.4 volts. So that the LED 22 is not in
- Reverse direction is biased via the voltage divider R22A_H / R22A_L and R22C_H / R22C_L with 0.2 volts. Inevitably, through the
- Patent claim 1 and solved by a method having the features of claim 13.
- Advantageous developments of the present invention are the subject of the dependent claims.
- the circuit arrangement according to the invention for driving LEDs in a matrix configuration having m columns and n rows, each LED of the matrix being individually activatable by activation of a corresponding column driver in connection with the activation of a corresponding row driver, has a bias for each row.
- the first bias terminal of the bias device is connected to the cathodes of m of the LEDs of that row and the second bias terminal of the bias device is connected to the anodes of the m LEDs of that row.
- each LED of the matrix is now each provided with a (non-illuminative)
- Relay voltage-sensitive LED relieved with the help of incapacitated semiconductor diodes of the applied reverse voltage.
- neither the number of columns m nor the number of lines n may be equal to one, since otherwise no parallel active path is not possible.
- columns and rows are interchangeable and represent in particular only the type of electrical connection and not necessarily a specific geometric arrangement of the LEDs to each other.
- the electrically interconnected electrodes of the semiconductor diodes are the anodes of the semiconductor diodes.
- the electrical coupling of the bias device to the cathodes of the m LEDs can be provided in at least one line in each case via at least one resistor, in particular via m resistors.
- the bias device has a
- Particularly advantageous here can be a multi-part ohmic
- Spansteiler be used with at least two taps, which is designed for electrical coupling to the anodes or cathodes of the LED of the respective row.
- the voltage divider may include at least one resistor.
- the voltage divider has a diode, in particular a Zener diode. This results in the advantage that a certain potential difference can be realized independently of the current through the voltage divider.
- the anode bias voltages generated by the respective bias devices per row are different for each of the m lines. As a result, variations of the LED current and / or the LED forward voltage can be taken into account, for example as a result of using LEDs of different colors.
- the circuit arrangement is designed to apply non-activated LEDs during operation with a maximum voltage of 0.5 volts in the flow direction, preferably a maximum of 0.2 volts in the flow direction to increase the distance from one Creep limit at which the first light emission of the LED occurs.
- a maximum voltage of 0.5 volts in the flow direction preferably a maximum of 0.2 volts in the flow direction to increase the distance from one Creep limit at which the first light emission of the LED occurs.
- non-driven LEDs with a voltage of at least 0.0 volts in the flow direction, preferably a minimum of 0.1 volts in
- Flow direction is applied to prevent damage to the LEDs by an inverse current.
- the bias device is designed to provide different anode bias voltages for m LEDs of a line with different currents and / or forward voltages. This makes it possible in particular to use different LEDs within a row.
- the circuit arrangement according to the invention can be used in a display device, resulting in a display device according to the invention.
- the inventive method for driving LEDs in a matrix configuration having m columns and n rows comprises the steps of coupling a first terminal of a bias device to the cathodes of m LEDs in the matrix configuration, wherein the bias device and the m LEDs are each associated with the same row, and coupling a second terminal of the bias means associated with that row to the anodes of the m LEDs in that row.
- each LED of the matrix is connected to a semiconductor diode such that the current provided by the associated terminal of the column driver for the respective driven LED flows over the semiconductor diode.
- Fig. 1 shows the general operating principle of a 2x2 LED matrix with appropriate
- FIG. 2 shows an equivalent circuit diagram of a 2x2 matrix with a potential control according to the prior art
- Fig. 3 is an equivalent circuit diagram of a 2x2 matrix with an inventive
- FIG. 4 shows an exemplary embodiment of a circuit arrangement according to the invention of a 2x2 matrix with line-dependent bias voltage.
- a first current source 110 and a second current source I20 are each coupled via a switch S10 or S20 to a row drive of the LED matrix.
- the switch S10 of the first row drive with the cathode of an LED 1 1 and the cathode of a LED12 is connected.
- the switch S20 of the second row driver is connected to the cathode of an LED21 and the cathode of an LED22.
- the anodes of the LED1 1 and the LED21 are coupled to a supply potential VCC via a switch S01 of a first column drive.
- the anodes of the LED12 and the LED22 are coupled to the supply potential VCC via a switch S02 of a second column drive.
- a switch S02 of a second column drive For example, in the case of a closed switch S01, the column drive and, in the case of a closed switch S10 of the row drive, a current flow through the LED1 1. This results, for example, via the LED1 1, a voltage drop in
- the bias device 12 comprises a first voltage divider consisting of the series connection of a resistor R22A_H and a resistor R22A_L, wherein the resistor R22A_H is coupled to the supply potential VCC and the resistor R22A_L is coupled to the reference potential GND. Furthermore, the bias device comprises a voltage divider consisting of the series connection of a resistor R22C_H and a resistor R22C_L, wherein the resistor
- R22C_H is coupled to the supply potential VCC and the resistor R22C_L is coupled to the reference potential GND.
- the connection point of the two resistors R22A_H and R22A_L is led out to a first bias terminal 14 of the biasing device 12 and the connection point of the resistor R22C_H and the resistor R22C_L on a second bias terminal 16.
- the series circuit is now from Switch S01 the
- connection point of the cathode of LED21 and the cathode of LED22 is connected to the second bias terminal 16, furthermore, the connection point of the anode of the LED22 to the anode of the LED12 is connected to the first bias terminal 14.
- a voltage of 3.4 volts As in the example above also here about the LED1 1 a voltage of 3.4 volts, according to the Kirch hope stitch rule, indicated by M1, must also fall above the LED21, LED22 and LED12 a total voltage of 3.4 volts.
- the potential is set so that there is a low forward voltage of 0.2 volts across the LED22, or in other words a blocking voltage of minus 0.2 volts.
- the remaining voltage is divided between the two LED21 and LED12, whereby 1, 8 volts drop in the flow direction above each of the two LED21 and LED12.
- an additional semiconductor diode D22 is inserted between the LED22 and the LED12, which has the same orientation as LED22, in other words both the LED22 and the LED
- the bias device 12 has two voltage sources U22A and U22C, which are both related to the common reference potential GND and respectively coupled to the first bias terminal 14 and the second bias terminal 16, respectively. Furthermore, the connection point of the cathode of the LED21 to the cathode of the LED22 is coupled to the second bias connection 16 via a coupling resistor R22C, and the connection point of the anode of the LED22 to the cathode of the semiconductor diode D22 is coupled to the first bias connection 14 via a coupling resistor R22A. The arrangement of the remaining elements is identical to the representation in FIG.
- the inventive insertion of the semiconductor diode D22 results in the present example in a potential distribution as described below. Above the LED21 and the LED12 results in each case a voltage drop of 0, 1 volt in the flow direction, further also results over the LED22 a voltage drop of 0, 1 volt in the flow direction or in other words minus 0, 1 volt in the reverse direction.
- the semiconductor diode D22 absorbs the majority of the blocking voltage in the amount of approximately 3.3 volts in the reverse direction.
- the circuit described here uses ordinary silicon diodes, for example the standard type 1 N4148, in series with the LEDs which take over the blocking voltage. Silicon diodes can withstand a reverse current permanently and are therefore suitable for this purpose. To ensure that no LED is exposed to a negative voltage, they are suitable with a low positive voltage over one
- the coupling resistors R22A and R22C can also be used as internal resistance of the sources U22A
- Fig. 4 shows a 2x2 LED matrix in which the inventive principle was applied for each LED in the matrix. Starting from that shown in Fig. 1
- LED1 1 is now coupled to switch S01 via the semiconductor diode D1 1
- the LED12 is coupled to the switch S02 via the semiconductor diode D12
- the LED21 is via the semiconductor diode D21 coupled to the switch S01
- the LED22 is coupled via the semiconductor diode D22 to the switch S02.
- a voltage divider can be arranged as an implementation of a voltage source with internal resistance at each anode and cathode of each LED of the 2x2 matrix.
- the dimensioning depends on the desired bias voltage and on the LEDs.
- three voltage dividers are necessary per line, that is a total of six voltage divider.
- the circuit can be adapted to different forward voltages and LED currents. Without additional effort, it is possible to use different LEDs per line. If you also want to control different LEDs within a row, this is possible by inserting a further series resistor with additional circuitry.
- the circuit works by the line-dependent anode bias in all states, this also allows dimming by pulse width modulation (PWM).
- PWM pulse width modulation
- Voltage divider per line for connecting the anodes of the LED, which are assigned to this line via coupling resistors.
- the voltage divider which is designed to connect the cathodes of the LED of the respective row, can be combined with the voltage divider coupled on the anode side, resulting in the voltage divider shown in FIG. 4, which has three resistors R10x, R10y and R10z includes.
- R10y is coupled on the one side directly to the common potential of the anodes of the LED1 1 and the LED12, on the other side via a
- the common connection point of the anodes of the LED1 1 and the LED12 with the resistor R10y is coupled to the reference potential GND via the resistor R10z.
- the common connection point of the resistors R10y, R1 1 and R12 is also coupled to the supply potential VCC via the resistor R10z.
- the first digit of the indices is here to change from one to two, such. From R10z to R20z or from LED12 to LED22.
- the bias device 12 comprises the three resistors R1 Ox, R1 Oy, and R10z, where the junction of R1 Ox and R1 Oy represents the first bias port 14, and the junction of R10y and R10z represents the second bias port 16 represents.
- This arrangement allows the adjustment of the anode bias voltage regardless of the forward voltage or the current from the LED and is also independent of the switching state of the line switches S10 and S20.
- the embodiment of FIG. 4 is only illustrative of the invention and is not limiting for this. In particular, the assignment of rows and columns is interchangeable, as well as the arrangement of current sources or
- the order of arrangement of the respective LED with its associated semiconductor diode can vary without departing from the spirit of the invention.
- the LED1 1 and LED12 of a row can also be connected to one another on the anode side instead of the cathode side, or even have no direct connection to one another at all.
- the exchange of the reference potential GND with the positive supply potential VCC is also possible, in which case the orientations of the LEDs and the semiconductor diodes must be adapted accordingly.
- the circuit arrangement according to the invention can be operated in a single mode with only one actively activated switch of the column control and the row control, whereby a maximum of one LED lights up at a certain time.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014213853.1A DE102014213853A1 (de) | 2014-07-16 | 2014-07-16 | Schaltungsanordnung und Verfahren zur Ansteuerung von LEDs in Matrix-Konfiguration |
PCT/EP2015/063968 WO2016008677A2 (de) | 2014-07-16 | 2015-06-22 | Schaltungsanordnung und verfahren zur ansteuerung von leds in matrix-konfiguration |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3170368A2 true EP3170368A2 (de) | 2017-05-24 |
EP3170368B1 EP3170368B1 (de) | 2022-08-10 |
Family
ID=53514157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15734316.1A Active EP3170368B1 (de) | 2014-07-16 | 2015-06-22 | Schaltungsanordnung und verfahren zur ansteuerung von leds in matrix-konfiguration |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3170368B1 (de) |
CN (1) | CN106538057B (de) |
DE (1) | DE102014213853A1 (de) |
RU (1) | RU2670967C9 (de) |
WO (1) | WO2016008677A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015219490A1 (de) * | 2015-10-08 | 2017-04-13 | BSH Hausgeräte GmbH | Matrixschaltung für eine Anzeigevorrichtung eines Haushaltsgerätes, Anzeigevorrichtung sowie Haushaltsgerät |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7382241B1 (en) * | 2005-10-06 | 2008-06-03 | Zhen Qiu Huang | Vehicle LED tail-light bulb |
US20090135618A1 (en) * | 2007-11-22 | 2009-05-28 | Everlight Electronics Co., Ltd. | Circuit apparatus of led vehicle lamp |
US20100295471A1 (en) * | 2009-05-25 | 2010-11-25 | Sanken Electric Co., Ltd. | Current balancing apparatus |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2182731C1 (ru) * | 2001-05-11 | 2002-05-20 | Полунин Андрей Вадимович | Устройство для отображения информации |
GB2381643A (en) * | 2001-10-31 | 2003-05-07 | Cambridge Display Tech Ltd | Display drivers |
US7057590B2 (en) * | 2003-11-04 | 2006-06-06 | Infineon Technologies Ag | LED array implementation |
US7245297B2 (en) * | 2004-05-22 | 2007-07-17 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
KR100985860B1 (ko) * | 2005-11-08 | 2010-10-08 | 삼성전자주식회사 | 발광장치 및 그 제어방법 |
KR100917623B1 (ko) * | 2006-02-13 | 2009-09-17 | 삼성전자주식회사 | Led 구동장치 |
DE102006050123A1 (de) | 2006-10-25 | 2008-05-15 | Bus Elektronik Gmbh & Co. Kg | Verfahren und Schaltung zum Schutz von aktiven LED-Matrix-Displays |
US8237640B2 (en) * | 2010-05-24 | 2012-08-07 | Immense Advance Technology Corp. | LED driver circuit having a bias current drawn from a load current |
KR101397953B1 (ko) * | 2010-12-20 | 2014-05-27 | 이동원 | 상용전원 2 종류를 지원하는 교류구동 엘이디 조명장치 |
WO2013090945A1 (en) * | 2011-12-16 | 2013-06-20 | Advanced Lighting Technologies, Inc. | Near unity power factor long life low cost led lamp retrofit system and method |
US10368410B2 (en) * | 2012-10-19 | 2019-07-30 | Linear Technology Corporation | PWM control for LEDs with reduced flicker when using spread spectrum switching frequencies |
-
2014
- 2014-07-16 DE DE102014213853.1A patent/DE102014213853A1/de not_active Withdrawn
-
2015
- 2015-06-22 EP EP15734316.1A patent/EP3170368B1/de active Active
- 2015-06-22 WO PCT/EP2015/063968 patent/WO2016008677A2/de active Application Filing
- 2015-06-22 RU RU2017102498A patent/RU2670967C9/ru active
- 2015-06-22 CN CN201580038599.0A patent/CN106538057B/zh active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7382241B1 (en) * | 2005-10-06 | 2008-06-03 | Zhen Qiu Huang | Vehicle LED tail-light bulb |
US20090135618A1 (en) * | 2007-11-22 | 2009-05-28 | Everlight Electronics Co., Ltd. | Circuit apparatus of led vehicle lamp |
US20100295471A1 (en) * | 2009-05-25 | 2010-11-25 | Sanken Electric Co., Ltd. | Current balancing apparatus |
Non-Patent Citations (1)
Title |
---|
See also references of WO2016008677A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN106538057B (zh) | 2018-04-13 |
RU2670967C9 (ru) | 2018-11-21 |
RU2670967C2 (ru) | 2018-10-26 |
CN106538057A (zh) | 2017-03-22 |
WO2016008677A3 (de) | 2016-03-17 |
DE102014213853A1 (de) | 2016-01-21 |
EP3170368B1 (de) | 2022-08-10 |
RU2017102498A3 (de) | 2018-08-24 |
RU2017102498A (ru) | 2018-08-16 |
WO2016008677A2 (de) | 2016-01-21 |
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