CN101739943A - Current regulator and method for improving LED display system performance - Google Patents
Current regulator and method for improving LED display system performance Download PDFInfo
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- CN101739943A CN101739943A CN200810177714A CN200810177714A CN101739943A CN 101739943 A CN101739943 A CN 101739943A CN 200810177714 A CN200810177714 A CN 200810177714A CN 200810177714 A CN200810177714 A CN 200810177714A CN 101739943 A CN101739943 A CN 101739943A
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Abstract
The invention discloses a current regulator for improving the performance of an LED display system. The LED display system comprises a voltage converter and an LED connected between the input end of the voltage converter and a node, which is characterized in that the current regulator comprises a first current source, a second current source and a detector, wherein, the first current source is connected between the node and an earth terminal, the second current source is connected between the node and the output end of the voltage converter, and the detector is used for enabling at least one of the first current source and the second current source. The current regulator and the method for improving the performance of the LED display system have the advantage of improving system performance.
Description
Technical field
The present invention relates to a kind of LED display system, specifically, is a kind of current regulator and method of the LED of improvement display system performance.
Background technology
Fig. 1 is traditional LED display system 10 synoptic diagram, it comprises that charge pump 12 is converted to output voltage VO UT with input voltage VIN and gives a plurality of LED D1 to DN, each current regulator 16 provides electric current one of them to a plurality of LED D1 to DN, each current regulator 16 respectively comprises operational amplifier 18 and transistor M1 and M2, wherein transistor M1 is connected between node N1 and the earth terminal GND, transistor M2 is connected between node N2 and the earth terminal GND, the anti-phase input connected node N1 of operational amplifier 18, the noninverting input connected node N2 of operational amplifier 18, the output of operational amplifier 18 connects the gate of transistor M1 and M2, it is identical that operational amplifier 18 is kept the voltage on node N1 and the N2, so the electric current by transistor M1 and M2 has proportionate relationship, the voltage VDS1 to VDSN on the node N2 of a plurality of current regulators 16 of mode detecting device 14 detectings is with the multiple pattern of decision charge pump 12.
Fig. 2 be in the LED display system 10 input voltage VIN and usefulness concern synoptic diagram.As shown in Figure 2, usefulness when LED display system 10 operates in 1 times of pattern is best, decline along with input voltage VIN, when mode detecting device 14 detects voltage on the node N2 of any current regulator 16 when being lower than a critical value, sending a signal makes charge pump 12 by 1 times of mode switch to 1.5 times pattern, in fact, the forward bias voltage drop of each LED D1 to DN is not quite similar, when the voltage on the node N2 of one of them current regulator 16 is lower than described critical value, voltage on the node N2 of other current regulator 16 may also not be lower than described critical value, in other words, there is the current regulator 16 of part still can normal operation when 1 times of pattern, therefore at charge pump 12 during by 1 times of mode switch to 1.5 times pattern, the LED display system will be lost part usefulness.
Therefore, known LED display system exists above-mentioned all inconvenience and problem.
Summary of the invention
Purpose of the present invention is to propose a kind of current regulator and method of the LED of improvement display system performance.
For achieving the above object, technical solution of the present invention is:
A kind of current regulator that improves the LED display system performance, described LED display system comprise an electric pressure converter and a LED is connected between the input end and a node of described electric pressure converter, it is characterized in that described current regulator comprises:
One first current source is connected between a described node and the earth terminal;
One second current source is connected between the output terminal of described node and described electric pressure converter;
One detector, in order to described first and second current source of activation wherein at least one.
Current regulator of the present invention can also be further achieved by the following technical measures.
Aforesaid current regulator, wherein said detector detect on the described node voltage so that can described first and second current source wherein at least one.
Aforesaid current regulator, the voltage of wherein said detector on described node be described first current source of activation during greater than a critical value, when described second current source of activation during less than described critical value of the voltage on the described node.
Aforesaid current regulator, the voltage of wherein said detector on described node be described first current source of activation during greater than a critical value, when described first and second current source of activation during less than described critical value of the voltage on the described node.
Aforesaid current regulator, the voltage of wherein said detector on described node is described first current source of activation during greater than a critical value, voltage on described node is during less than described critical value, and described detector is exported a control signal and switched described first and second current source.
Aforesaid current regulator, wherein said first current source was enabled during the work period of described control signal, and described second current source was enabled during the inoperative cycle of described control signal.
A kind of current regulator that improves the LED display system performance, described LED display system comprise an electric pressure converter and a LED is connected between an earth terminal and the node, it is characterized in that described current regulator comprises:
One first current source is connected between the input end of described node and described electric pressure converter;
One second current source is connected between the output terminal of described node and described electric pressure converter;
One detector, in order to described first and second current source of activation wherein at least one.
Aforesaid current regulator, wherein said detector detect on the described node voltage so that can described first and second current source wherein at least one.
Aforesaid current regulator, the voltage of wherein said detector on described node be described first current source of activation during greater than a critical value, when described second current source of activation during less than described critical value of the voltage on the described node.
Aforesaid current regulator, the voltage of wherein said detector on described node be described first current source of activation during greater than a critical value, when described first and second current source of activation during less than described critical value of the voltage on the described node.
Aforesaid current regulator, the voltage of wherein said detector on described node is described first current source of activation during greater than a critical value, voltage on described node is during less than described critical value, and described detector is exported a control signal and switched described first and second current source.
Aforesaid current regulator, wherein said first current source was enabled during the work period of described control signal, and described second current source was enabled during the inoperative cycle of described control signal.
A kind of method of improving the LED display system performance, described LED display system comprise that an electric pressure converter and a LED are connected between the input end and a node of described electric pressure converter, is characterized in that described method comprises the following steps:
First step: detect the voltage on the described node;
Second step: according to one first current source of the voltage activation on the described node and one second current source wherein at least one, wherein said first current source is connected between a described node and the earth terminal, and described second current source is connected between the output terminal of described node and described electric pressure converter.
The method of the LED of improvement display system performance of the present invention can also be further achieved by the following technical measures.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: when described second current source of activation during of the voltage on the described node less than described critical value.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node is described first and second current source of activation during less than described critical value.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node provides a control signal to switch described first and second current source during less than described critical value.
Aforesaid method, the wherein said step of described first and second current source of control signal switching that provides comprises the following steps:
First step: during the work period of described control signal, described first current source of activation;
Second step: during the inoperative cycle of described control signal, described second current source of activation.
A kind of method of improving the LED display system performance, described LED display system comprise that an electric pressure converter and a LED are connected between a node and the earth terminal, it is characterized in that described method comprises the following steps:
First step: detect the voltage on the described node;
Second step: according to one first current source of the voltage activation on the described node and one second current source wherein at least one, wherein said first current source is connected between the input end and described node of electric pressure converter, and described second current source is connected between the output terminal and described node of described electric pressure converter.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: when described second current source of activation during of the voltage on the described node less than described critical value.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node is described first and second current source of activation during less than described critical value.
Aforesaid method, wherein said according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node provides a control signal to switch described first and second current source during less than described critical value.
Aforesaid method, the wherein said step of described first and second current source of control signal switching that provides comprises:
First step: during the work period of described control signal, described first current source of activation;
Second step: during the inoperative cycle of described control signal, described second current source of activation.
After adopting technique scheme, the current regulator of the LED of improvement display system performance of the present invention and method have the advantage of improving system effectiveness.
Description of drawings
Fig. 1 is traditional LED display system schematics;
Fig. 2 is the synoptic diagram that concerns of the input voltage VIN of LED display system among Fig. 1 and usefulness;
Fig. 3 is the embodiments of the invention synoptic diagram;
Fig. 4 is the operational illustrations intention of current regulator among Fig. 3;
Fig. 5 is the operational illustrations intention of current regulator among Fig. 3;
Fig. 6 be among Fig. 1 among LED display system and Fig. 3 the efficiency ratio of LED display system 10 than synoptic diagram;
Fig. 7 is the operation chart of current regulator among Fig. 3;
Fig. 8 is the operation chart of current regulator among Fig. 3;
Fig. 9 is the oscillogram of electric current I LED1 among Fig. 8;
Figure 10 is another embodiment synoptic diagram of current regulator among Fig. 3;
Figure 11 is the another embodiment synoptic diagram of current regulator among Fig. 3.
Embodiment
Fig. 3 is the embodiments of the invention synoptic diagram, in described LED display system 20, charge pump 24 is converted to output voltage VO UT with input voltage VIN, charge pump 24 may operate in-0.5 times of pattern and-1 times of pattern, a plurality of current regulators 22 provide separately a plurality of electric current I LED1 to ILEDN to a plurality of LED D1 to DN one of them.In each current regulator 22, current source 26 is connected between node P1 and the earth terminal GND, current source 32 is connected between the output terminal VOUT of node P1 and charge pump 24, and whether the voltage on the mode detecting device 30 detecting node P1 determine activation current source 26 and 32.Current source 26 comprises operational amplifier 28, transistor M1 and M2 and switch SW 1, wherein transistor M1 is connected between the anti-phase input and earth terminal GND of operational amplifier, transistor M2 is connected between node P1 and the earth terminal GND, the noninverting input connected node P1 of operational amplifier 28 and its output connects the gate of transistor M1 and M2, switch SW 1 is connected between the output and earth terminal GND of operational amplifier 28, is controlled by mode detecting device 30.Current source 32 comprises operational amplifier 34, transistor M3 and M4 and switch SW 2, wherein transistor M3 is connected between the output terminal VOUT of node P1 and charge pump 24, transistor M4 is connected between the output terminal VOUT of the anti-phase input of operational amplifier 34 and charge pump 24, the noninverting input connected node P1 of operational amplifier 34 and its output connects the gate of transistor M3 and M4, switch SW 2 is connected between the output terminal VOUT of the output of operational amplifier 34 and charge pump 24, is controlled by mode detecting device 30.Because input voltage VIN directly offers LED D1 to DN,, therefore can reduce the use of assembly, for example resistor assembly so charge pump 24 need not 1 times of pattern.
Fig. 4 and Fig. 5 are first kind of operation embodiment synoptic diagram of current regulator 22.In described current regulator 22, voltage on the mode detecting device 30 detecting node P1 is to judge the size of input voltage VIN, when the voltage on the node P1 is not lower than a critical value, mode detecting device 30 cuts out (turn off) switch SW 1 with activation current source 26, and open (turn on) switch SW 2 with turn off current source 32, as shown in Figure 4, at this moment, provide electric current I LED1 to LED D1 by current source 26.When the voltage on the node P1 is lower than described critical value, expression input voltage VIN deficiency, mode detecting device 30 is opened switch SW 1 with turn off current source 26, and off switch SW2 is with activation current source 32, as shown in Figure 5, provide electric current I LED1 to LED D1 by current source 32 this moment.Fig. 6 be LED display system 20 with the efficiency ratio of traditional LED display system 10 than synoptic diagram, wherein curve 40 is the usefulness of traditional LED display system 10, curve 42 is the usefulness of LED display system 20.In traditional LED display system 10, as long as one of them current regulator 16 enters 1.5 times of patterns, then whole current regulators 16 all will enter 1.5 times of patterns, so the usefulness of LED display system 10 descends soon, shown in curve 40, but in LED display system 20, whether each current regulator 22 enters-0.5 times of pattern by 1 times of pattern is to be judged voluntarily by each current regulator 22, therefore the usefulness of LED display system 20 descends lentamente, shown in curve 42, so LED display system 20 has preferable usefulness.
Fig. 7 is second kind of current regulator 22 an operation embodiment synoptic diagram, and it comprises current source 26 and 32 and mode detecting device 30 equally.Voltage on node P1 is during greater than a critical value, and mode detecting device 30 off switch SW1 are with activation current source 26, and opens switch SW 2 with turn off current source 32, so the time provide electric current I LED1 to LED D1 by current source 26.When the voltage on the node P1 during less than described critical value, mode detecting device 30 activation current sources 26 and 32, wherein current source 26 provides electric current I 1, current source 32 provides electric current I 2, and equal (I1+I2) by the electric current I LED1 of LED D1, the electric current I 1 that current source 26 provides will reduce along with the decline of input voltage VIN, and the electric current I 2 that current source 32 provides will increase along with reducing of input voltage VIN, and the electric current I LED1 by LED D1 will equal electric current I 2 at last.
Fig. 8 is the third operation embodiment synoptic diagram of current regulator 22, and it comprises current source 26 and 32 and mode detecting device 30 equally.Voltage on node P1 is during greater than a critical value, and mode detecting device 30 off switch SW1 are with activation current source 26, and opens switch SW 2 with turn off current source 32, so the time provide electric current to LED D1 by current source 26.When input voltage VIN during less than described critical value, mode detecting device 30 provides a control signal switchable current source 26 and 32.Fig. 9 is the oscillogram of electric current I LED1 among Fig. 8, suppose that control signal has period T, current source 26 activations during the work period of control signal Ton, this moment, electric current I LED1 equaled electric current I 1, and current source 32 activations during the inoperative period T off of control signal, so the time electric current I LED1 equal electric current I 2, the work period Ton of control signal and inoperative period T off respectively account for 50% again, so the average current of electric current I LED1
Iavg=(I1/2)+(I2/2) formula 1
Wherein, the ratio of the work period Ton of control signal and inoperative period T off will change with input voltage VIN.
Figure 10 is another embodiment synoptic diagram of current regulator 22, wherein node P1 connects the anode of diode D1, current source 26 is connected between the input end VIN and node P1 of charge pump 24, current source 32 is connected between the output terminal VOUT and node P1 of charge pump 24, voltage on the mode detecting device 30 detecting node P1, activation current source 26 and 32 according to this.Current source 26 comprises operational amplifier 28, transistor M1 and M2 and switch SW 1, transistor M1 is connected between the noninverting input of the input end VIN of charge pump 24 and operational amplifier 28, transistor M2 is connected between the anti-phase input of the input end VIN of charge pump 24 and operational amplifier 28, the output of operational amplifier 28 connects the gate of transistor M1 and M2, switch SW 1 is connected between the input end VIN of the output of operational amplifier 28 and charge pump 24, is controlled by mode detecting device 30.Current source 32 comprises operational amplifier 34, transistor M3 and M4 and switch SW 2, transistor M3 is connected between the anti-phase input of the output terminal VOUT of charge pump 24 and operational amplifier 34, transistor M4 is connected between the noninverting input of the output terminal VOUT of charge pump 24 and operational amplifier 34, the output of operational amplifier 34 connects the gate of transistor M3 and M4, switch SW 2 is connected between the output terminal VOUT of the output of operational amplifier 34 and charge pump 24, is controlled by mode detecting device 30.Same, voltage on node P1 is during greater than a critical value, mode detecting device 30 activation current source 26 and turn off current source 32, when the voltage on the node P1 during less than described critical value, mode detecting device 30 can turn off current source 26 and activation current source 32 or activation current source 26 and 32 or switchable current source 26 and 32 in turn.
Figure 11 is the another embodiment synoptic diagram of current regulator 22, wherein current source 50 is connected between node P1 and the earth terminal GND, current source 54 is connected between the output terminal VOUT of node P1 and charge pump 24, the voltage on the mode detecting device 30 detecting node P1, activation current source 50 and 54 according to this.Current source 50 comprises operational amplifier 52, switch SW 3, transistor M5 and resistance R 1 and R2, switch SW 3 is connected between the noninverting input of node N3 and operational amplifier 52, be controlled by mode detecting device 30, transistor M5 is connected between the anti-phase input of node P1 and operational amplifier 52, the output of operational amplifier 52 connects the gate of transistor M5, resistance R 1 is connected between the noninverting input and earth terminal GND of operational amplifier 52, and resistance R 2 is connected between the anti-phase input and earth terminal GND of operational amplifier 52.Current source 54 comprises operational amplifier 56, switch SW 4, transistor M6 and resistance R 3 and R4, switch SW 4 is connected between the noninverting input of node N3 and operational amplifier 56, be controlled by mode detecting device 30, transistor M6 is connected between the anti-phase input of node P1 and operational amplifier 56, the output of operational amplifier 56 connects the gate of transistor M6, resistance R 3 is connected between the output terminal VOUT of the anti-phase input of operational amplifier 56 and charge pump 24, and resistance R 4 is connected between the output terminal VOUT of the noninverting input of operational amplifier 56 and charge pump 24.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
The element numbers explanation
10 LED display systems
12 charge pumps
14 mode detecting devices
16 current regulators
18 operational amplifiers
20 LED display systems
22 current regulators
24 charge pumps
26 current sources
28 operational amplifiers
30 mode detecting devices
32 current sources
34 operational amplifiers
The usefulness of 40 LED display systems 10
The usefulness of 42 LED display systems 20
50 current sources
52 operational amplifiers
54 current sources
56 operational amplifiers
Claims (22)
1. current regulator that improves the LED display system performance, described LED display system comprises an electric pressure converter and a LED is connected between the input end and a node of described electric pressure converter, it is characterized in that described current regulator comprises:
One first current source is connected between a described node and the earth terminal;
One second current source is connected between the output terminal of described node and described electric pressure converter;
One detector, in order to described first and second current source of activation wherein at least one.
2. current regulator as claimed in claim 1 is characterized in that, described detector detect on the described node voltage so that can described first and second current source wherein at least one.
3. current regulator as claimed in claim 1 is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, when described second current source of activation during less than described critical value of the voltage on the described node.
4. current regulator as claimed in claim 1, it is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, when described first and second current source of activation during less than described critical value of the voltage on the described node.
5. current regulator as claimed in claim 1, it is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, voltage on described node is during less than described critical value, and described detector is exported a control signal and switched described first and second current source.
6. current regulator as claimed in claim 1 is characterized in that, described first current source was enabled during the work period of described control signal, and described second current source was enabled during the inoperative cycle of described control signal.
7. current regulator that improves the LED display system performance, described LED display system comprises an electric pressure converter and a LED is connected between an earth terminal and the node, it is characterized in that described current regulator comprises:
One first current source is connected between the input end of described node and described electric pressure converter;
One second current source is connected between the output terminal of described node and described electric pressure converter;
One detector, in order to described first and second current source of activation wherein at least one.
8. current regulator as claimed in claim 7 is characterized in that, described detector detect on the described node voltage so that can described first and second current source wherein at least one.
9. current regulator as claimed in claim 7 is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, when described second current source of activation during less than described critical value of the voltage on the described node.
10. current regulator as claimed in claim 7, it is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, when described first and second current source of activation during less than described critical value of the voltage on the described node.
11. current regulator as claimed in claim 7, it is characterized in that, the voltage of described detector on described node is described first current source of activation during greater than a critical value, voltage on described node is during less than described critical value, and described detector is exported a control signal and switched described first and second current source.
12. current regulator as claimed in claim 11 is characterized in that, described first current source was enabled during the work period of described control signal, and described second current source was enabled during the inoperative cycle of described control signal.
13. a method of improving the LED display system performance, described LED display system comprise that an electric pressure converter and a LED are connected between the input end and a node of described electric pressure converter, is characterized in that described method comprises the following steps:
First step: detect the voltage on the described node;
Second step: according to one first current source of the voltage activation on the described node and one second current source wherein at least one, wherein said first current source is connected between a described node and the earth terminal, and described second current source is connected between the output terminal of described node and described electric pressure converter.
14. method as claimed in claim 13 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: when described second current source of activation during of the voltage on the described node less than described critical value.
15. method as claimed in claim 13 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node is described first and second current source of activation during less than described critical value.
16. method as claimed in claim 13 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node provides a control signal to switch described first and second current source during less than described critical value.
17. method as claimed in claim 16 is characterized in that, the described step of described first and second current source of control signal switching that provides comprises the following steps:
First step: during the work period of described control signal, described first current source of activation;
Second step: during the inoperative cycle of described control signal, described second current source of activation.
18. a method of improving the LED display system performance, described LED display system comprise that an electric pressure converter and a LED are connected between a node and the earth terminal, it is characterized in that described method comprises the following steps:
First step: detect the voltage on the described node;
Second step: according to one first current source of the voltage activation on the described node and one second current source wherein at least one, wherein said first current source is connected between the input end and described node of electric pressure converter, and described second current source is connected between the output terminal and described node of described electric pressure converter.
19. method as claimed in claim 18 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: when described second current source of activation during of the voltage on the described node less than described critical value.
20. method as claimed in claim 18 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node is described first and second current source of activation during less than described critical value.
21. method as claimed in claim 18 is characterized in that, described according to one first current source of the voltage activation on the described node and one second current source wherein at least one step comprise the following steps:
First step: the voltage on described node is described first current source of activation during greater than a critical value;
Second step: the voltage on described node provides a control signal to switch described first and second current source during less than described critical value.
22. method as claimed in claim 21 is characterized in that, the described step of described first and second current source of control signal switching that provides comprises:
First step: during the work period of described control signal, described first current source of activation;
Second step: during the inoperative cycle of described control signal, described second current source of activation.
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| CN1779749A (en) * | 2004-11-23 | 2006-05-31 | 亚洲光学股份有限公司 | Driving circuit of light-emitting diode |
| CN1953029A (en) * | 2005-10-20 | 2007-04-25 | 美国凹凸微系有限公司 | Apparatus and method for regulating white lEDs |
| US20070182698A1 (en) * | 2006-02-09 | 2007-08-09 | Samsung Electro-Mechanics Co., Ltd. | Drive device of color led backlight |
| CN101207950A (en) * | 2006-12-20 | 2008-06-25 | 钰瀚科技股份有限公司 | System, redundant circuit and method for driving light emitting diode |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779749A (en) * | 2004-11-23 | 2006-05-31 | 亚洲光学股份有限公司 | Driving circuit of light-emitting diode |
| CN1953029A (en) * | 2005-10-20 | 2007-04-25 | 美国凹凸微系有限公司 | Apparatus and method for regulating white lEDs |
| US20070182698A1 (en) * | 2006-02-09 | 2007-08-09 | Samsung Electro-Mechanics Co., Ltd. | Drive device of color led backlight |
| CN101207950A (en) * | 2006-12-20 | 2008-06-25 | 钰瀚科技股份有限公司 | System, redundant circuit and method for driving light emitting diode |
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