CN104143315A - Method for reducing electromagnetic interference of LED display system and LED display system - Google Patents
Method for reducing electromagnetic interference of LED display system and LED display system Download PDFInfo
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Abstract
The invention discloses a method for reducing electromagnetic interference of an LED display system and the LED display system. The LED display system comprises at least one display unit, wherein the display unit comprises a receiving card, an interface adapter plate HUB and at least one module which are connected in sequence. The receiving card is used for receiving a common-mode signal and sending the common-mode signal to the HUB. The HUB comprises a common-mode signal conversion circuit, wherein two ends of the common-mode signal conversion circuit are respectively connected with the output end of the receiving card and the input end of the module are used for converting the common-mode signal received by the HUB into a differential signal. The HUB is further used for sending the differential signal to the module. The module comprises a differential common-mode conversion circuit, wherein one end of the differential common-mode conversion circuit is connected with the HUB, and the other end of the differential common-mode conversion circuit outputs the common-mode signal. In the mode, the electromagnetic interference of an LED display screen can be effectively reduced under the conditions that the frequency increase is not influenced and an external magnet ring is also not needed.
Description
Technical field
The present invention relates to LED and show field, particularly relate to the method and the LED display system that reduce LED display system electromagnetic interference capability.
Background technology
Modern society's digital display technique makes rapid progress, LED display is as a kind of novel digital display medium, and it is widely used in the numerous areas such as news media's issue, advertising, competitive sports relay, large-scale program stage scene with features such as color rendition degree true to nature, high brightness, life-span length.As described in Figure 1, existing LED display comprises receiving card 101, interface card extender 102 and at least one module 103, its workflow is generally receiving card 101 signal receiving is sent to HUB102, HUB102 transfers to signal module 103 again, then is lighted by module 103 driving LED lamp pearls.But because LED display is in the time working, its clock frequency may be up to tens, and the signal wire of signal transmission produces the electromagnetic wave of very large intensity.This electromagnetic wave can be carried over into along with power lead by beyond the casing forming to multiple modules, high-intensity electromagnetic wave is taken out of after casing, can be to producing serious electromagnetic interference (EMI) in its surrounding environment, affect periphery resident's normal life, thereby the electromagnetic interference (EMI) that how to reduce LED display has become a hot issue of those skilled in the art's research.
In currently available technology, the method that reduces LED display electromagnetic interference (EMI) mainly contains two kinds, and a kind of is to reduce electromagnetic interference (EMI) by the clock frequency of reduction LED display.But owing to being that clock frequency is an important parameter of LED display work, there is closely bound up contacting with the parameter such as refreshing frequency and gray shade scale of LED display, although reduction clock frequency has reduced the electromagnetic interference (EMI) of LED display in theory, but other parameters such as refreshing frequency and gray shade scale of signal clock are also reduced simultaneously, and refreshing frequency has reduced, can affect further the brightness of LED display, affect the whole structure of LED display.
The another kind of method that solves LED display electromagnetic interference (EMI) for adding magnet ring on signal wire, and the electromagnetic interference (EMI) that absorption signal line produces plays the effect of undesired signal being carried out to filtering.Although make can play in this way the effect of filtering, but because the internal volume of LED casing is generally smaller, and the volume ratio of magnet ring is larger, signal wire is added after magnet ring, the seriously inner space of compression casing, and because the signal wire of LED box house is many, need the quantity of magnet ring also more, and magnet ring of every interpolation, capital increases the cost of LED display, and magnet ring is overlapped on signal wire and also has technological requirement, if the discontented foot of technological requirement may affect the display effect of LED display, cause product undesirable.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of method and LED display system of the LED of reduction display system electromagnetic interference (EMI), in the increase that do not affect frequency also without the electromagnetic interference (EMI) that can effectively reduce LED display overcoat magnet ring.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of LED display system is provided, comprises at least one display unit, described display unit comprises the receiving card, interface card extender HUB and at least one module that connect successively,
Described receiving card is used for receiving common-mode signal, and described common-mode signal is sent to described HUB;
Described HUB comprises common mode differential conversion circuit, and the two ends of described common mode differential conversion circuit are connected with the output terminal of described receiving card and the input end of described module respectively, are converted to differential signal for the common-mode signal that described HUB is received; Described HUB is also for being sent to module by described differential signal;
Described module comprises difference common mode change-over circuit, and described difference common mode change-over circuit one end is connected with HUB, and the other end, as the output terminal of described module, is converted to common-mode signal for the differential signal that described module is received.
Wherein, described display unit also comprises LED lamp pearl driving circuit, and described LED lamp pearl driving circuit is connected with the output terminal of described module, lights for driving LED lamp pearl.
Wherein, described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and data-signal.
Wherein, described receiving card is also for gathering the environmental variance of described module, and described environmental variance comprises described module electromagnetism intensity around.
Wherein, described receiving card is also connected with host computer, shows for the environmental variance collecting is sent to host computer.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of interface built-up circuit is provided, described interface built-up circuit comprises the common-mode signal input end connecting in turn, common mode differential conversion circuit and differential signal output terminal, described common-mode signal input end is for being connected with the receiving card of LED display system, receive the common-mode signal that described receiving card sends, described common mode differential conversion circuit is for converting described common-mode signal to differential signal, described differential signal output terminal is for being connected with the module of described LED display system, for described differential signal is sent to described module.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of module is provided, described module comprises the differential signal input end, difference common mode change-over circuit and the common-mode signal output terminal that connect in turn, described differential signal input end is for being connected with the HUB of LED display system, receive the differential signal that described HUB sends, described difference common mode change-over circuit is for converting described differential signal to common-mode signal, and described common-mode signal output terminal is for sending described common-mode signal.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of method of the LED of reduction display system electromagnetic interference (EMI) is provided, comprises the steps:
The common-mode signal receiving is sent to HUB by receiving card;
Described HUB is converted to differential signal by common mode differential conversion circuit disposed thereon by described common-mode signal, and described differential signal is sent to at least one module;
Described at least one module receives after above-mentioned differential signal, by difference common mode change-over circuit disposed thereon, described differential signal is converted to common-mode signal.
Wherein, described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and data-signal.
Wherein, at described HUB, described differential signal is sent to at least one module, described at least one module receives after above-mentioned differential signal, after described differential signal being converted to the step of common-mode signal by difference common mode change-over circuit disposed thereon, further comprising the steps of:
Described common-mode signal is sent to LED lamp pearl driving circuit by described module, and described LED lamp pearl driving circuit is lighted according to described common-mode signal driving LED lamp pearl.
The invention has the beneficial effects as follows: the situation that is different from prior art, the present invention is converted to differential signal by add common mode differential conversion circuit on HUB by common-mode signal, the signal value that utilizes differential signal is offset the electromagnetic interference (EMI) that common-mode signal produces for the right difference of signal, the present invention is also by add difference common mode change-over circuit on module, then differential signal is converted to common-mode signal.In the case of the increase that do not affect frequency also without can effective reduction common-mode signal overcoat magnet ring in transmitting procedure, produce electromagnetic interference (EMI), and cost is low, also can not reduce the performance of LED display itself.
Brief description of the drawings
Fig. 1 is prior art LED display casing signal wire connection layout;
Fig. 2 is LED display system one embodiment structural representation of the present invention;
Fig. 3 A is the power circuit of common mode differential conversion circuit;
Fig. 3 B is the schematic diagram of common mode differential conversion circuit;
Fig. 3 C is the part physical circuit schematic diagram of common mode differential conversion circuit one embodiment;
Fig. 4 A is the power circuit of difference common mode change-over circuit;
Fig. 4 B is the schematic diagram of difference common mode change-over circuit;
Fig. 4 C is the part physical circuit schematic diagram of difference common mode change-over circuit one embodiment;
Fig. 5 is the structural representation of another embodiment of LED display system of the present invention;
Fig. 6 is the structural representation of the another embodiment of LED display system of the present invention;
Fig. 7 is the structural representation of interface built-up circuit one embodiment of the present invention;
Fig. 8 is the structural representation of module one embodiment of the present invention;
Fig. 9 is the process flow diagram that the present invention reduces method one embodiment of LED display system electromagnetic interference (EMI);
Figure 10 is the process flow diagram that the present invention reduces another embodiment of method of LED display system electromagnetic interference (EMI);
Figure 11 is the process flow diagram that the present invention reduces the another embodiment of method of LED display system electromagnetic interference (EMI).
Embodiment
Consult Fig. 2, Fig. 2 is the structural representation of LED display system one embodiment of the present invention.
The LED display system of present embodiment comprises at least one display unit (not shown), and described display unit comprises the receiving card 201, interface card extender HUB202 and at least one module 203 that connect successively.
Described HUB202 comprises common mode differential conversion circuit 2021, and the two ends of described common mode differential conversion circuit 2021 are connected with the output terminal of described receiving card 201 and the input end of described module 203 respectively.
Described module 203 comprises difference common mode change-over circuit 2031, and described difference common mode change-over circuit 2031 one end are connected with HUB202, and the other end is as the output terminal of described module 203.
Described receiving card 201 is for receiving common-mode signal, and described common-mode signal is sent to described HUB202.Described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and the data-signal of LED display.
Described HUB202, for receiving the common-mode signal that above-mentioned receiving card 201 sends, is converted into differential signal by common mode differential conversion circuit 2021 by above-mentioned common-mode signal, also for above-mentioned differential signal is sent to module 203.
Described module 203 is for receiving above-mentioned differential signal, and by difference common mode change-over circuit 2031, above-mentioned differential signal is converted to common-mode signal.
Particularly, the receiving card 201 of LED display system receives the common-mode signal from signal source, by signal wire, common-mode signal is transferred to interface card extender HUB202, above-mentioned common-mode signal is converted to differential signal by common mode differential conversion circuit 2021 on interface card extender HUB202, transmitting to the module 203 being connected with HUB202 by signal wire, because differential signal is that amplitude equates, the two paths of signals of single spin-echo, the induction electromotive force of the generation in its signals transmission is contrary, thereby the magnetic field being produced by induction electromotive force is also that intensity is identical, opposite direction, in transmitting procedure, the two can be offset completely, effectively reduce the electromagnetic interference (EMI) producing in signals transmission.
Fig. 3 A is the power circuit of common mode differential conversion circuit, and the input voltage of wherein said power circuit is 5V, and output voltage is 3.3V.Fig. 3 B is the schematic diagram of common mode differential conversion circuit, its middle port OE1+, CLK1+, LAT1+ and A1+ are the common-mode signal input end of common mode differential conversion circuit, represent input common-mode signal, accordingly, port OE1-, CLK1-, LAT1-and A1-are the differential signal output terminal of common mode differential conversion circuit, represent output difference sub-signal.Fig. 3 C is the part physical circuit schematic diagram of common mode differential conversion circuit one embodiment.
The voltage output end of 3.3V in Fig. 3 A is connected with the voltage input end in Fig. 3 C.As shown in Figure 3 C, in Fig. 3 C, input voltage is 3.3V.The first port of the shown common mode differential conversion circuit of Fig. 3 C is enable signal input end OE1 (being equivalent to the port OE1+ in Fig. 3 B), the second port of the shown common mode differential conversion circuit of Fig. 3 C is clock signal input terminal CLK1 (being equivalent to the port CLK1+ in Fig. 3 B), the 3rd port is latch signal input end LAT1 (being equivalent to the port LAT1+ in Fig. 3 B), and the 4th port is sweep signal input end A1 (being equivalent to the port A1+ in Fig. 3 C).The first port of common mode differential conversion circuit, the second port, the 3rd port and the 4th port respectively with the enable signal output terminal of receiving card, clock signal output terminal, latch signal output terminal and sweep signal output terminal are connected, be respectively used to receive the enable signal of receiving card output, clock signal, latch signal and sweep signal, in addition, the common-mode signal input end of common mode differential conversion circuit also comprises data-signal input end (not shown), described data-signal input end is connected with the data-signal output terminal of receiving card, for transmission of data signals.
Above-mentioned enable signal, clock signal, latch signal, sweep signal and data-signal that common mode differential conversion circuit receives receiving card output by common-mode signal input end are common-mode signal, described common-mode signal refers to that amplitude is identical, also identical signal of phase place, and differential signal refers to that amplitude is identical, the signal of single spin-echo, common mode differential conversion circuit changes through phase place, above-mentioned common-mode signal is converted to differential signal, then differential signal is sent to module.
Particularly, the five-port of common mode differential conversion circuit is enable signal output terminal OE1-(being equivalent to the port OE1-in Fig. 3 B), the 6th port is clock signal output terminal CLK1-(being equivalent to the port CLK1-in Fig. 3 B), the 7th port is latch signal output terminal LAT1-(being equivalent to the port LAT1-in Fig. 3 B), and the 8th port is sweep signal output terminals A 1-(being equivalent to the port A1-in Fig. 3 B).Five-port, the 6th port, the 7th port and the 8th port of common mode differential conversion circuit is connected with enable signal input end, clock signal input terminal, latch signal input end and the sweep signal input end of module respectively, enable signal, clock signal, latch signal, the sweep signal of differential signal have been converted to respectively to module output, common mode differential conversion circuit also comprises data-signal output terminal (not shown) simultaneously, be connected with the data-signal input end of module, be also converted to the data-signal of differential signal to module output.
And because LED display general work signal is common-mode signal, thereby module 203, in the time of outside output signal, also needs, through difference common mode change-over circuit 2031, above-mentioned differential signal is restored into common-mode signal.Particularly, the fundamental diagram of difference common mode change-over circuit as shown in Figure 4.
Fig. 4 A is the power circuit of difference common mode change-over circuit, and wherein, the input voltage of described power circuit is 5V, and output voltage is 3.3V.Fig. 4 B is the schematic diagram of difference common mode change-over circuit, wherein, port SDI-, CLK-, LAT-and A1-are the differential signal input end of difference common mode change-over circuit, represent input differential signal, accordingly, port SDI+, CLK+, LAT+ and A1+ are the common-mode signal output terminal of difference common mode change-over circuit, represent output common mode signal.Fig. 4 C is the part physical circuit schematic diagram of difference common mode change-over circuit one embodiment.
The voltage output end of 3.3V in Fig. 4 A is connected with the voltage input end in Fig. 4 C.As shown in Figure 4 C, in Fig. 4 C, input voltage is 3.3V.The first port of the shown difference common mode change-over circuit of Fig. 4 C is enable signal input end OE-(not indicating in Fig. 4 B), the second port is clock signal input terminal CLK-(being equivalent to the port CLK-in Fig. 4 B), the 3rd port is latch signal input end LAT-(being equivalent to the port LAT-in Fig. 4 B), and the 4th port is sweep signal input end A-(being equivalent to the port A-in Fig. 4 B).The first port of difference common mode change-over circuit, the second port, the 3rd port and the 4th port respectively with the enable signal output terminal that is arranged on the common mode differential conversion circuit on HUB, clock signal output terminal, latch signal output terminal and sweep signal output terminal are connected, for receiving the enable signal of HUB output, clock signal, latch signal and sweep signal, in addition, the common-mode signal input end of difference common mode change-over circuit also comprises data-signal input end (not shown), described data-signal input end is connected with the data-signal output terminal of common mode differential conversion circuit, for transmission of data signals.
Above-mentioned enable signal, clock signal, latch signal, sweep signal and data-signal that difference common mode change-over circuit receives by differential signal input end are differential signal, difference common mode change-over circuit changes through phase place, above-mentioned differential signal is converted to common-mode signal, then common-mode signal is exported.
Particularly, the five-port of difference common mode change-over circuit is enable signal output terminal OE (not indicating in Fig. 4 B), the 6th port is clock signal output terminal CLK (being equivalent to the port CLK+ in Fig. 4 B), the 7th port is latch signal output terminal LAT (being equivalent to the port LAT+ in Fig. 4 B), and the 8th port is sweep signal output terminals A (being equivalent to the port A+ in Fig. 4 B).Five-port, the 6th port, the 7th port and the 8th port of difference common mode change-over circuit is connected with enable signal input end, clock signal input terminal, latch signal input end and the sweep signal input end of lamp pearl driving circuit respectively, and the data-signal output terminal of difference common mode change-over circuit is connected with the data-signal input end of lamp pearl driving circuit simultaneously.Lamp pearl driving circuit drives lamp pearl to light further.
In another embodiment, as shown in Figure 5, the LED display system in present embodiment also comprises lamp pearl driving circuit 204, and lamp pearl driving circuit 204 is connected with the output terminal of described module, lights for driving LED lamp pearl.
Be different from prior art, the LED display system of present embodiment is converted to differential signal by add common mode differential conversion circuit on HUB by common-mode signal, the signal value that utilizes differential signal is offset the electromagnetic interference (EMI) that common-mode signal produces for the right difference of signal, the present invention is also by add difference common mode change-over circuit on module, then differential signal is converted to common-mode signal.The electromagnetic interference (EMI) can effective reduction common-mode signal producing in transmitting procedure, and cost is low, also can not reduce the performance of LED display itself.
In another embodiment, as shown in Figure 6, Fig. 6 is the structural representation of the another embodiment of LED display system of the present invention.Physical property when better obtaining the size of electromagnetism intensity in LED display surrounding environment and LED work, receiving card 301 is also for gathering LED display environmental variance around, described environmental variance comprises described module electromagnetism intensity around, and receiving card 301 is the physical parameter when gathering module 303 and work also.And the physical parameter that collects environmental variance around of module 303 and module is uploaded to host computer 304 provide reference for user.Can realize more accurately the monitoring of the electromagnetic interference (EMI) to LED display.
Consult Fig. 7, Fig. 7 is the structural representation of interface built-up circuit one embodiment of the present invention.The interface built-up circuit 400 of present embodiment comprises the common-mode signal input end 401, common mode differential conversion circuit 402 and the differential signal output terminal 403 that connect in turn, described common-mode signal input end 401 is for being connected with the receiving card of LED display system, receive the common-mode signal that described receiving card sends, described common mode differential conversion circuit 402 is for converting described common-mode signal to differential signal, described differential signal output terminal 403 is for being connected with the module of described LED display system, for described differential signal is sent to described module.
Be different from prior art, the interface built-up circuit of present embodiment comprises the common-mode signal input end, common mode differential conversion circuit, the differential signal output terminal that connect successively, the common-mode signal that receiving card can be sent converts differential signal to and is sent to module, in the increase that do not affect frequency also without the electromagnetic interference (EMI) that can effectively reduce LED display system overcoat magnet ring and produce.
Consult Fig. 8, Fig. 8 is the structural representation of module one embodiment of the present invention.The module 500 of present embodiment comprises the differential signal input end 501, difference common mode change-over circuit 502 and the common-mode signal output terminal 503 that connect in turn, described differential signal input end 501 is for being connected with the HUB of LED display system, receive the differential signal that described HUB sends, described difference common mode change-over circuit 502 is for converting described differential signal to common-mode signal, and described common-mode signal output terminal 503 is for sending described common-mode signal.
Be different from prior art, the module of present embodiment comprises the differential signal input end, difference common mode change-over circuit, the common-mode signal output terminal that connect successively, the differential signal sending that HUB can be sent converts differential signal to and sends, so that LED display system lightening LED lamp pearl further, in the increase that do not affect frequency also without the electromagnetic interference (EMI) that can effectively reduce LED display system overcoat magnet ring and produce.
Consult Fig. 9, Fig. 9 is the process flow diagram that the present invention reduces method one embodiment of LED display system electromagnetic interference (EMI).
The method of the reduction LED display system electromagnetic interference (EMI) of present embodiment comprises the steps:
Step 601: the common-mode signal receiving is sent to HUB by receiving card.
The receiving card of LED display system receives the common-mode signal from signal source, by signal wire, common-mode signal is transferred to interface card extender HUB.Described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and the data-signal of LED display.
Step 602: described HUB is converted to differential signal by common mode differential conversion circuit disposed thereon by described common-mode signal, and described differential signal is sent to at least one module.
In order to effectively reduce the electromagnetic interference (EMI) producing in signals transmission, above-mentioned common-mode signal is converted to differential signal by common mode differential conversion circuit on interface card extender HUB, transmit to the module being connected with HUB by signal wire again, because differential signal is that amplitude equates, the two paths of signals of single spin-echo, the induction electromotive force of the generation in its signals transmission is contrary, thereby the magnetic field being produced by induction electromotive force is also that intensity is identical, opposite direction, in transmitting procedure, the two can be offset, and eliminates the electromagnetic interference (EMI) that common-mode signal produces.
Step 603: described differential signal is sent at least one module by described HUB, described at least one module receives after above-mentioned differential signal, by difference common mode change-over circuit disposed thereon, described differential signal is converted to common-mode signal.
Because LED display general work signal is common-mode signal, thereby module, in the time of outside output signal, also needs, through difference common mode change-over circuit, above-mentioned differential signal is restored into common-mode signal.
In another embodiment, as shown in figure 10, after being converted to common-mode signal by difference common mode change-over circuit disposed thereon by described differential signal, step module also comprises step 704, described common-mode signal is sent to LED lamp pearl driving circuit by described module, and described LED lamp pearl driving circuit is lighted according to described common-mode signal driving LED lamp pearl.Further, LED display is started working.
Be different from prior art, the LED display system of present embodiment is converted to differential signal by add common mode differential conversion circuit on HUB by common-mode signal, the signal value that utilizes differential signal is offset the electromagnetic interference (EMI) that common-mode signal produces for the right difference of signal, the present invention is also by add difference common mode change-over circuit on module, then differential signal is converted to common-mode signal.In the increase that do not affect frequency, also without the electromagnetic interference (EMI) can effective reduction common-mode signal overcoat magnet ring producing in transmitting procedure, and cost is low, also can not reduce the performance of LED display itself.
In another embodiment, as shown in figure 11, at step module, described common-mode signal is sent to LED lamp pearl driving circuit, described LED lamp pearl driving circuit also comprises step 805 after lighting according to described common-mode signal driving LED lamp pearl, described receiving card gathers the environmental variance of described module, and the environmental variance collecting is sent to host computer shows.
Physical property when better obtaining the size of electromagnetism intensity in LED display surrounding environment and LED work, receiving card gathers LED display environmental variance around, described environmental variance comprises described module electromagnetism intensity around, physical parameter when receiving card gathers module work.And the physical parameter that collects environmental variance around of module and module is uploaded to host computer provide reference for user.In the increase that do not affect frequency also without the monitoring that can realize more accurately the electromagnetic interference (EMI) to LED display overcoat magnet ring.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a LED display system, comprises at least one display unit, it is characterized in that, described display unit comprises the receiving card, interface card extender HUB and at least one module that connect successively,
Described receiving card is used for receiving common-mode signal, and described common-mode signal is sent to described HUB;
Described HUB comprises common mode differential conversion circuit, and the two ends of described common mode differential conversion circuit are connected with the output terminal of described receiving card and the input end of described module respectively, are converted to differential signal for the common-mode signal that described HUB is received; Described HUB is also for being sent to module by described differential signal;
Described module comprises difference common mode change-over circuit, and described difference common mode change-over circuit one end is connected with HUB, and the other end, as the output terminal of described module, is converted to common-mode signal for the differential signal that described module is received.
2. LED display system according to claim 1, is characterized in that, described display unit also comprises LED lamp pearl driving circuit, and described LED lamp pearl driving circuit is connected with the output terminal of described module, lights for driving LED lamp pearl.
3. LED display system according to claim 1, is characterized in that, described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and data-signal.
4. LED display system according to claim 2, is characterized in that, described receiving card is also for gathering the environmental variance of described module, and described environmental variance comprises described module electromagnetism intensity around.
5. LED display system according to claim 4, is characterized in that, described receiving card is also connected with host computer, shows for the environmental variance collecting is sent to host computer.
6. an interface built-up circuit, it is characterized in that, described interface built-up circuit comprises the common-mode signal input end, common mode differential conversion circuit and the differential signal output terminal that connect in turn, described common-mode signal input end is for being connected with the receiving card of LED display system, receive the common-mode signal that described receiving card sends, described common mode differential conversion circuit is for converting described common-mode signal to differential signal, described differential signal output terminal is for being connected with the module of described LED display system, for described differential signal is sent to described module.
7. a module, it is characterized in that, described module comprises the differential signal input end, difference common mode change-over circuit and the common-mode signal output terminal that connect in turn, described differential signal input end is for being connected with the HUB of LED display system, receive the differential signal that described HUB sends, described difference common mode change-over circuit is for converting described differential signal to common-mode signal, and described common-mode signal output terminal is for sending described common-mode signal.
8. a method that reduces LED display system electromagnetic interference (EMI), is characterized in that, comprises the steps:
The common-mode signal receiving is sent to HUB by receiving card;
Described HUB is converted to differential signal by common mode differential conversion circuit disposed thereon by described common-mode signal, and described differential signal is sent to at least one module;
Described at least one module receives after above-mentioned differential signal, by difference common mode change-over circuit disposed thereon, described differential signal is converted to common-mode signal.
9. method according to claim 8, is characterized in that, described common-mode signal comprises clock signal, latch signal, enable signal, sweep signal and data-signal.
10. method according to claim 8, it is characterized in that, at described HUB, described differential signal is sent to at least one module, described at least one module receives after above-mentioned differential signal, after described differential signal being converted to the step of common-mode signal by difference common mode change-over circuit disposed thereon, further comprising the steps of:
Described common-mode signal is sent to LED lamp pearl driving circuit by described module, and described LED lamp pearl driving circuit is lighted according to described common-mode signal driving LED lamp pearl.
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| CN109410894A (en) * | 2019-01-08 | 2019-03-01 | 京东方科技集团股份有限公司 | Generate the method and module, display device of differential output signal |
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