CN104143315B - LED display system, device and the method reducing LED display system electromagnetic interference - Google Patents
LED display system, device and the method reducing LED display system electromagnetic interference Download PDFInfo
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- CN104143315B CN104143315B CN201410313093.3A CN201410313093A CN104143315B CN 104143315 B CN104143315 B CN 104143315B CN 201410313093 A CN201410313093 A CN 201410313093A CN 104143315 B CN104143315 B CN 104143315B
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Abstract
The invention discloses a kind of method reducing LED display system electromagnetic interference and LED display system.LED display system includes receiving card, interface plate HUB and at least one module that at least one display unit, described display unit include being sequentially connected with, and receiving card is used for receiving common-mode signal, and sends common-mode signal to described HUB；HUB includes common-mode differential change-over circuit, and the two ends of described common-mode differential change-over circuit input with the outfan of described receiving card and described module respectively is connected, for the common-mode signal that described HUB receives is converted to differential signal；HUB is additionally operable to send to module described differential signal；Module includes that difference common mode change-over circuit, difference common mode change-over circuit one end are connected with HUB, other end output common mode signal.By the way, the present invention can effectively reduce the electromagnetic interference of LED display in the case of not affecting the increasing without overcoat magnet ring of frequency.
Description
Technical field
The present invention relates to LED and show field, particularly relate to LED display system, device and fall
The method of low LED display system electromagnetic interference.
Background technology
Modern society's digital display technique makes rapid progress, and LED display is as a kind of novel numeral
Display medium, it is extensively applied with features such as color rendition degree true to nature, high brightness, life-span length
Many in news media's issue, advertising, competitive sports relay, large-scale program stage scene etc.
Field.As described in Figure 1, existing LED display includes receiving card 101, interface plate 102
And at least one module 103, its workflow signal that generally receiving card 101 will receive
Transmission transmits a signal to module 103 again to HUB 102, HUB 102, then is driven by module 103
Dynamic LED lamp bead is lighted.But due to LED display operationally, its clock frequency may be high
Reaching tens, the holding wire of transmission signal produces the electromagnetic wave of the biggest intensity.This electromagnetic wave can be with
Power line and be carried over into beyond by the casing formed to multiple modules, the electromagnetic wave of high intensity
After being carried over casing, nearby residents can be affected to environment about produces serious electromagnetic interference
Orthobiosis, thus, the electromagnetic interference how reducing LED display has become as this area skill
One hot issue of art personnel research.
In currently available technology, the method reducing LED display electromagnetic interference mainly has two kinds, and one
Plant is that the clock frequency by reducing LED display reduces electromagnetic interference.But owing to being clock
Frequency is an important parameter of LED display work, with the refreshing frequency of LED display with
And the parameter such as tonal gradation suffers from closely bound up contact, subtract in theory although reducing clock frequency
Lacked the electromagnetic interference of LED display, but also reduce simultaneously the refreshing frequency of signal clock with
And other parameters such as tonal gradation, and refreshing frequency reduces, and can affect LED further and show
The brightness of screen, have impact on the whole structure of LED display.
The another kind of method of LED display electromagnetic interference that solves, for add magnet ring on holding wire, absorbs
The electromagnetic interference that holding wire produces plays the effect being filtered interference signal.Use this side
Although method can play the effect of filtering, but owing to the internal volume of LED box typically compares
Little, and the volume ratio of magnet ring is relatively big, after holding wire is added magnet ring, understands the interior of heavy compression casing
Space, portion, and the holding wire within LED box is the most, needs the quantity of magnet ring the most relatively
Many, and often add a magnet ring, all can increase the cost of LED display, and by magnet ring set letter
Also technological requirement is had, if technological requirement is unsatisfactory for affecting LED display on number line
Display effect, cause product undesirable.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of LED display system, device and reduction
The method of LED display system electromagnetic interference, is not affecting the increase of frequency without overcoat magnet ring
In the case of can effectively reduce the electromagnetic interference of LED display.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide one
LED display system, including at least one display unit, described display unit includes being sequentially connected with
Receiving card, interface plate HUB and at least one module,
Described receiving card is used for receiving common-mode signal, and sends described common-mode signal to described
HUB；
Described HUB includes common-mode differential change-over circuit, the two ends of described common-mode differential change-over circuit
Input with the outfan of described receiving card and described module is connected respectively, wherein, described
First port of common-mode differential change-over circuit enables the enable letter of signal input part and described receiving card
Number outfan connects, the clock signal output of the second port clock signal input and described receiving card
End connects, and the 3rd port latch signal input connects with the latch signal outfan of described receiving card
Connecing, the 4th TCP signal input part is connected with the scanning signal output part of described receiving card；
For the common-mode signal that described HUB receives is converted to differential signal；Described HUB is additionally operable to
Described differential signal is sent to module；
Described module includes difference common mode change-over circuit, described difference common mode change-over circuit one end with
HUB is connected, and the other end is as the outfan of described module, and wherein, described difference common mode is changed
The fifth port enable signal enabling signal input part and described common-mode differential change-over circuit of circuit
Outfan connects, the clock signal input terminal of described difference common mode change-over circuit and described common-mode differential
6th port clock signal outfan of change-over circuit connects, the lock of described difference common mode change-over circuit
Deposit the 7th port latch signal outfan of signal input part and described common-mode differential change-over circuit even
Connect, the scanning signal input part of described difference common mode change-over circuit and described common-mode differential change-over circuit
The 8th TCP signal output part connect；For the differential signal that described module receives is turned
It is changed to common-mode signal.
Wherein, described display unit also includes that LED lamp bead drive circuit, described LED lamp bead drive
Galvanic electricity road is connected with the outfan of described module, is used for driving LED lamp bead to light.
Wherein, described common-mode signal includes clock signal, latch signal, enable signal, scanning letter
Number and data signal.
Wherein, described receiving card is additionally operable to gather the environmental variable of described module, described environmental variable
Including the electromagnetism intensity around described module.
Wherein, described receiving card is also attached with host computer, for the environmental variable that will collect
Transmission to host computer shows.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide one to connect
Mouth built-up circuit, described interface circuit includes common-mode signal input, the common mode being sequentially connected with
Differential conversion circuit and differential signal outputs, described common-mode signal input is for showing with LED
Show system receiving card connect, receive described receiving card send common-mode signal, wherein, described in connect
The signal input part that enables of mouth built-up circuit is connected with the enable signal output part of described receiving card, time
Clock signal input part is connected with the clock signal output terminal of described receiving card, latch signal input with
The latch signal outfan of described receiving card connects, and scanning signal input part is swept with described receiving card
Retouch signal output part to be connected；Described common-mode differential change-over circuit is for changing described common-mode signal
Becoming differential signal, described differential signal outputs is for the module with described LED display system even
Connect, wherein, the enable signal enabling signal output part and described module of described interface circuit
Input connects, and clock signal output terminal is connected with the clock signal input terminal of described module, latches
Signal output part is connected with the latch signal input of described module, and scanning signal output part is with described
The scanning signal input part of module is connected；For described differential signal is sent to described module.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of mould
Group, differential signal input that described module includes being sequentially connected with, difference common mode change-over circuit and
Common-mode signal outfan, described differential signal input is for the HUB with LED display system even
Connecing, receive described HUB and send the differential signal of coming, wherein, the enable signal of described module is defeated
Enter end to be connected with the enable signal output part of described HUB, the clock signal input terminal of described module
It is connected with the clock signal output terminal of described HUB, the latch signal input of described module and institute
The latch signal outfan stating HUB connects, and the scanning signal input part of described module is with described
The scanning signal output part of HUB connects；Described difference common mode change-over circuit is for believing described difference
Number being converted into common-mode signal, described common-mode signal outfan is for sending out described common-mode signal
Go.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide one fall
The method of low LED display system electromagnetic interference, comprises the steps:
The common-mode signal received is sent to HUB by receiving card；
Described common-mode signal is turned by described HUB by the common-mode differential change-over circuit being disposed thereon
It is changed to differential signal, and described differential signal is sent at least one module；Wherein, described common
First port of mould differential conversion circuit enables the enable signal of signal input part and described receiving card
Outfan connects, the second port clock signal input and the clock signal output terminal of described receiving card
Connecting, the 3rd port latch signal input is connected with the latch signal outfan of described receiving card,
4th TCP signal input part is connected with the scanning signal output part of described receiving card；
After at least one module described receives above-mentioned differential signal, by the difference being disposed thereon
Described differential signal is converted to common-mode signal by common mode change-over circuit；Wherein, described difference common mode turns
Change the fifth port enable letter enabling signal input part and described common-mode differential change-over circuit of circuit
Number outfan connects, and the clock signal input terminal of described difference common mode change-over circuit is poor with described common mode
The 6th port clock signal outfan dividing change-over circuit connects, described difference common mode change-over circuit
Latch signal input and the 7th port latch signal outfan of described common-mode differential change-over circuit
Connect, the scanning signal input part of described difference common mode change-over circuit and described common-mode differential conversion electricity
The 8th TCP signal output part on road connects.
Wherein, described common-mode signal includes clock signal, latch signal, enable signal, scanning letter
Number and data signal.
Wherein, described HUB by described differential signal send at least one module, described extremely
After a few module receives above-mentioned differential signal, by the difference common mode conversion electricity being disposed thereon
After described differential signal is converted to the step of common-mode signal by road, further comprising the steps of:
Described common-mode signal is sent to LED lamp bead drive circuit, described LED by described module
Pearl drive circuit drives LED lamp bead to light according to described common-mode signal.
The invention has the beneficial effects as follows: be different from the situation of prior art, the present invention is by HUB
Common-mode signal is converted to differential signal by upper interpolation common-mode differential change-over circuit, utilizes differential signal
Signal value be signal pair difference to offset common-mode signal produce electromagnetic interference, the present invention also by
Module adds difference common mode change-over circuit, then differential signal is converted to common-mode signal.Not
The increase affecting frequency is passing without can effectively reduce common-mode signal in the case of overcoat magnet ring
Produce during defeated electromagnetic interference, and low cost, also will not reduce LED display itself
Performance.
Accompanying drawing explanation
Fig. 1 is prior art LED display casing holding wire connection figure；
Fig. 2 is the LED display system one embodiment structural representation of the present invention；
Fig. 3 A is the power circuit of common-mode differential change-over circuit；
Fig. 3 B is the schematic diagram of common-mode differential change-over circuit；
Fig. 3 C is the part physical circuit schematic diagram of common-mode differential change-over 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 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 flow process that the present invention reduces method one embodiment of LED display system electromagnetic interference
Figure；
Figure 10 is another embodiment of method that the present invention reduces LED display system electromagnetic interference
Flow chart；
Figure 11 is the another embodiment of method that the present invention reduces LED display system electromagnetic interference
Flow chart.
Detailed description of the invention
It is the structural representation of LED display system one embodiment of the present invention refering to Fig. 2, Fig. 2.
The LED display system of present embodiment includes at least one display unit (not shown),
Receiving card 201 that described display unit includes being sequentially connected with, interface plate HUB 202 and extremely
A few module 203.
Described HUB 202 includes common-mode differential change-over circuit 2021, described common-mode differential conversion electricity
The two ends on road 2021 defeated with the outfan of described receiving card 201 and described module 203 respectively
Enter end to be connected.
Described module 203 includes difference common mode change-over circuit 2031, described difference common mode change-over circuit
2031 one end are connected with HUB 202, and the other end is as the outfan of described module 203.
Described receiving card 201 is used for receiving common-mode signal, and sends described common-mode signal to described
HUB 202.Described common-mode signal includes the clock signal of LED display, latch signal, enable
Signal, scanning signal and data signal.
Described HUB 202 sends, for receiving above-mentioned receiving card 201, the common-mode signal of coming, by altogether
Above-mentioned common-mode signal is converted into differential signal by mould differential conversion circuit 2021, is additionally operable to above-mentioned
Differential signal sends to module 203.
Described module 203 is used for receiving above-mentioned differential signal, and by difference common mode change-over circuit
Above-mentioned differential signal is converted to common-mode signal by 2031.
Specifically, the receiving card 201 of LED display system receives the common-mode signal from signal source,
By holding wire by common-mode signal transmission to interface plate HUB 202, interface plate HUB
Above-mentioned common-mode signal is converted to differential signal by the common-mode differential change-over circuit 2021 on 202, logical
Cross the module 203 that signal alignment is connected with HUB 202 to transmit, owing to differential signal is amplitude phase
Deng, the two paths of signals of opposite in phase, the induction electromotive force phase of the generation in its signals transmission
Instead, thus the magnetic field produced by induction electromotive force is also that intensity is identical, in opposite direction, is being transmitted across
Cheng Zhong, the two can be completely counterbalanced by, and effectively reduces the electromagnetism produced in signals transmission and does
Disturb.
Fig. 3 A is the power circuit of common-mode differential change-over circuit, the input of wherein said power circuit
Voltage is 5V, and output voltage is 3.3V.Fig. 3 B is the schematic diagram of common-mode differential change-over circuit, its
Middle port OE1+, CLK1+, LAT1+ and A1+ are the common mode of common-mode differential change-over circuit
Signal input part, represents input common-mode signal, accordingly, port OE1-, CLK1-, LAT1-
And A1-is the differential signal outputs of common-mode differential change-over circuit, represent output differential signal.
Fig. 3 C is the part physical circuit schematic diagram of common-mode differential change-over circuit one embodiment.
The voltage output end of the 3.3V in Fig. 3 A is connected with the voltage input end in Fig. 3 C.As
Shown in Fig. 3 C, in Fig. 3 C, input voltage is 3.3V.Common-mode differential conversion electricity shown by Fig. 3 C
First port on road is to enable signal input part OE1 (the port OE1+ being equivalent in Fig. 3 B),
Second port of the common-mode differential change-over circuit shown by 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 LAT1 (phase
Port LAT1+ when in Fig. 3 B), the 4th port is that scanning signal input part A1 (is equivalent to
Port A1+ in Fig. 3 C).First port of common-mode differential change-over circuit, the second port, the 3rd
Port and the 4th port respectively with the enable signal output part of receiving card, clock signal output terminal,
Latch signal outfan and scanning signal output part are connected, and are respectively used to receive receiving card output
Enable signal, clock signal, latch signal and scanning signal, it addition, common-mode differential conversion
The common-mode signal input of circuit also includes data signal input (not shown), described number
It is connected with the data signal output of receiving card according to signal input part, is used for transmitting data signal.
Common-mode differential change-over circuit receives the above-mentioned of receiving card output by common-mode signal input
Enable signal, clock signal, latch signal, scanning signal and data signal and be common-mode signal,
Described common-mode signal refers to that amplitude is identical, the signal that phase place is the most identical, and differential signal refers to amplitude
Identical, the signal of opposite in phase, common-mode differential change-over circuit changes through phase place, by above-mentioned common mode
Signal is converted to differential signal, then sends differential signal to module.
Specifically, the fifth port of common-mode differential change-over circuit is to enable signal output part OE1-(phase
Port OE1-when in Fig. 3 B), the 6th port is that clock signal output terminal CLK1-is (suitable
Port CLK1-in Fig. 3 B), the 7th port is that latch signal outfan LAT1-(is equivalent to
Port LAT1-in Fig. 3 B), the 8th port is that scanning signal output part A1-(is equivalent to Fig. 3 B
In port A1-).The fifth port of common-mode differential change-over circuit, the 6th port, the 7th port with
And the 8th port respectively with the enable signal input part of module, clock signal input terminal, latch signal
Input and scanning signal input part are connected, and have been converted into difference letter to module output respectively
Number enable signal, clock signal, latch signal, scanning signal, simultaneously common-mode differential conversion electricity
Road also includes data signal output (not shown), with the data signal input phase of module
Connect, be also converted into the data signal of differential signal to module output.
And owing to LED display general work signal is common-mode signal, thus, module 203 to
During outer output signal, also need to be restored by above-mentioned differential signal through difference common mode change-over circuit 2031
Become common-mode signal.Specifically, the fundamental diagram of difference common mode change-over circuit is as shown in Figure 4.
Fig. 4 A is the power circuit of difference common mode change-over circuit, wherein, and described power circuit defeated
Entering voltage 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-is the difference letter of difference common mode change-over circuit
Number input, represents input differential signal, accordingly, port SDI+, CLK+, LAT+ and
A1+ is the common-mode signal outfan of difference common mode change-over circuit, represents output common mode signal.Figure
4C is the part physical circuit schematic diagram of difference common mode change-over circuit one embodiment.
The voltage output end of the 3.3V in Fig. 4 A is connected with the voltage input end in Fig. 4 C.As
Shown in Fig. 4 C, in Fig. 4 C, input voltage is 3.3V.Difference common mode conversion electricity shown by Fig. 4 C
First port on road is to enable signal input part OE-(not indicating in Fig. 4 B), when the second port is
Clock signal input part CLK-(is equivalent to the port CLK-in Fig. 4 B), and the 3rd port is to latch letter
Number input LAT-(being equivalent to the port LAT-in Fig. 4 B), the 4th port is that scanning signal is defeated
Enter to hold A-(the port A-being equivalent in Fig. 4 B).First port of difference common mode change-over circuit,
Second port, the 3rd port and the 4th port turn with the common-mode differential being arranged on HUB respectively
Change the enable signal output part of circuit, clock signal output terminal, latch signal outfan and scanning
Signal output part is connected, for receiving the enable signal of HUB output, clock signal, latch
Signal and scanning signal, it addition, the common-mode signal input of difference common mode change-over circuit also includes
Data signal input (not shown), described data signal input and common mode differential conversion
The data signal output of circuit is connected, and is used for transmitting data signal.
Above-mentioned enable signal that difference common mode change-over circuit is received by differential signal input, time
Clock signal, latch signal, scanning signal and data signal are differential signal, and difference common mode turns
Change circuit to change through phase place, above-mentioned differential signal is converted to common-mode signal, then by common-mode signal
Output.
Specifically, the fifth port of difference common mode change-over circuit is to enable signal output part OE (figure
4B does not indicates), the 6th port is that clock signal output terminal CLK (is equivalent to the end in Fig. 4 B
Mouth CLK+), the 7th port is that latch signal outfan LAT (is equivalent to the port in Fig. 4 B
LAT+), the 8th port is scanning signal output part A (the port A+ being equivalent in Fig. 4 B).
The fifth port of difference common mode change-over circuit, the 6th port, the 7th port and the 8th port are respectively
With the enable signal input part of lamp bead drive circuit, clock signal input terminal, latch signal input
And scanning signal input part is connected, the data signal output of difference common mode change-over circuit simultaneously
It is connected with the data signal input of lamp bead drive circuit.Lamp bead drive circuit drives further
Lamp bead is lighted.
In another embodiment, as it is shown in figure 5, LED display system in present embodiment
Also include that lamp bead drive circuit 204, lamp bead drive circuit 204 are connected with the outfan of described module
Connect, be used for driving LED lamp bead to light.
Being different from prior art, the LED display system of present embodiment is by adding on HUB
Common-mode signal is converted to differential signal by common-mode differential change-over circuit, utilizes the signal value of differential signal
Difference for signal pair offsets the electromagnetic interference that common-mode signal produces, and the present invention is also by module
Upper interpolation difference common mode change-over circuit, then differential signal is converted to common-mode signal.Can effectively drop
The electromagnetic interference that low common-mode signal produces in transmitting procedure, and low cost, also will not reduce LED
The performance of display screen itself.
In another embodiment, as shown in Figure 6, Fig. 6 be LED display system of the present invention again
The structural representation of one embodiment.In order to preferably obtain electromagnetism in LED display surrounding
The physical property when size of intensity and LED operation, receiving card 301 is additionally operable to gather LED and shows
Environmental variable around display screen, described environmental variable includes the electromagnetism intensity around described module, connects
Receive card 301 to be additionally operable to gather physical parameter when module 303 works.And module 303 will be collected
The physical parameter of environmental variable around and module uploads to host computer 304 and provides the user ginseng
Examine.The monitoring of the electromagnetic interference to LED display can be realized more accurately.
It is the structural representation of interface circuit one embodiment of the present invention refering to Fig. 7, Fig. 7.
Common-mode signal input 401 that the interface circuit 400 of present embodiment includes being sequentially connected with,
Common-mode differential change-over circuit 402 and differential signal outputs 403, described common-mode signal input
401 for being connected with the receiving card of LED display system, receives the common mode letter that described receiving card sends
Number, described common-mode differential change-over circuit 402 is used for described common-mode signal is converted into differential signal,
Described differential signal outputs 403 is for being connected with the module of described LED display system, and being used for will
Described differential signal sends to described module.
Being different from prior art, the interface circuit of present embodiment includes the common mode being sequentially connected with
Signal input part, common-mode differential change-over circuit, differential signal outputs, it is possible to receiving card is sent
The common-mode signal come is converted into differential signal and sends to module, do not affect the increase of frequency without
The electromagnetic interference that LED display system produces can be effectively reduced in the case of overcoat magnet ring.
It is the structural representation of module one embodiment of the present invention refering to Fig. 8, Fig. 8.This embodiment party
The module 500 of formula includes differential signal input 501, the difference common mode change-over circuit being sequentially connected with
502 and common-mode signal outfan 503, described differential signal input 501 is for showing with LED
Show that the HUB of system connects, receive described HUB and send the differential signal of coming, described difference common mode
Change-over circuit 502 for being converted into common-mode signal by described differential signal, and described common-mode signal exports
End 503 is for sending described common-mode signal.
Being different from prior art, the module of present embodiment includes the differential signal input being sequentially connected with
End, difference common mode change-over circuit, common-mode signal outfan, it is possible to HUB is sent the transmission of coming
The differential signal come is converted into differential signal and sends, so that the further place of LED display system
Bright LED lamp bead, do not affect the increase of frequency without overcoat magnet ring in the case of can effectively drop
The electromagnetic interference that low LED display system produces.
It is method one enforcement that the present invention reduces LED display system electromagnetic interference refering to Fig. 9, Fig. 9
The flow chart of mode.
The method of the reduction LED display system electromagnetic interference of present embodiment comprises the steps:
Step 601: the common-mode signal received is sent to HUB by receiving card.
The receiving card of LED display system receives the common-mode signal from signal source, will by holding wire
Common-mode signal is transmitted to interface plate HUB.Described common-mode signal include LED display time
Clock signal, latch signal, enable signal, scanning signal and data signal.
Step 602: the common-mode differential change-over circuit that described HUB passes through to be disposed thereon is by described common
Mould signal is converted to differential signal, and sends described differential signal at least one module.
In order to effectively reduce the electromagnetic interference produced in signals transmission, interface plate HUB
On common-mode differential change-over circuit above-mentioned common-mode signal is converted to differential signal, then pass through holding wire
To the module transmission being connected with HUB, owing to differential signal is that amplitude is equal, opposite in phase
Two paths of signals, the induction electromotive force of the generation in its signals transmission is contrary, thus by sensing
The magnetic field that electromotive force produces also is that intensity is identical, and in opposite direction, in transmitting procedure, the two can
Offset, eliminate the electromagnetic interference that common-mode signal produces.
Step 603: described HUB by described differential signal send at least one module, described extremely
After a few module receives above-mentioned differential signal, by the difference common mode conversion electricity being disposed thereon
Described differential signal is converted to common-mode signal by road.
Owing to LED display general work signal is common-mode signal, thus, module is in outwards output
During signal, also need, through difference common mode change-over circuit, above-mentioned differential signal is then reduced into common-mode signal.
In another embodiment, as shown in Figure 10, in step module by being disposed thereon
Difference common mode change-over circuit described differential signal is converted to common-mode signal after also include step
704, described common-mode signal is sent to LED lamp bead drive circuit, described LED by described module
Pearl drive circuit drives LED lamp bead to light according to described common-mode signal.Further, LED shows
Display screen is started working.
Being different from prior art, the LED display system of present embodiment is by adding on HUB
Common-mode signal is converted to differential signal by common-mode differential change-over circuit, utilizes the signal value of differential signal
Difference for signal pair offsets the electromagnetic interference that common-mode signal produces, and the present invention is also by module
Upper interpolation difference common mode change-over circuit, then differential signal is converted to common-mode signal.Do not affecting frequency
The increase of rate can effectively reduce common-mode signal in transmitting procedure without in the case of overcoat magnet ring
The electromagnetic interference of middle generation, and low cost, also will not reduce the performance of LED display itself.
In another embodiment, as shown in figure 11, in step module by described common-mode signal
Being sent to LED lamp bead drive circuit, described LED lamp bead drive circuit is according to described common-mode signal
Driving LED lamp bead also to include step 805 after lighting, described receiving card gathers the ring of described module
Border variable, and the environmental variable collected transmission is shown to host computer.
In order to preferably obtain size and the LED work of electromagnetism intensity in LED display surrounding
Physical property when making, receiving card gathers the environmental variable around LED display, and described environment becomes
Amount includes the electromagnetism intensity around described module, and receiving card gathers physical parameter during module work.
And the physical parameter of the environmental variable collected around module and module is uploaded to host computer be
User provides reference.Do not affect the increase of frequency without overcoat magnet ring in the case of can be more
The accurate monitoring realizing the electromagnetic interference to LED display.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention,
Every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process conversion, or
Directly or indirectly being used in other relevant technical fields, the patent being the most in like manner included in the present invention is protected
In the range of protecting.
Claims (10)
1. a LED display system, including at least one display unit, it is characterised in that institute
State receiving card, interface plate HUB and at least one mould that display unit includes being sequentially connected with
Group,
Described receiving card is used for receiving common-mode signal, and sends described common-mode signal to described
HUB；
Described HUB includes common-mode differential change-over circuit, the two ends of described common-mode differential change-over circuit
Input with the outfan of described receiving card and described module is connected respectively, wherein, described
First port of common-mode differential change-over circuit enables the enable letter of signal input part and described receiving card
Number outfan connects, the clock signal output of the second port clock signal input and described receiving card
End connects, and the 3rd port latch signal input connects with the latch signal outfan of described receiving card
Connecing, the 4th TCP signal input part is connected with the scanning signal output part of described receiving card；
For the common-mode signal that described HUB receives is converted to differential signal；Described HUB is additionally operable to
Described differential signal is sent to module；
Described module includes difference common mode change-over circuit, described difference common mode change-over circuit one end with
HUB is connected, and the other end is as the outfan of described module, and wherein, described difference common mode is changed
The fifth port enable signal enabling signal input part and described common-mode differential change-over circuit of circuit
Outfan connects, the clock signal input terminal of described difference common mode change-over circuit and described common-mode differential
6th port clock signal outfan of change-over circuit connects, the lock of described difference common mode change-over circuit
Deposit the 7th port latch signal outfan of signal input part and described common-mode differential change-over circuit even
Connect, the scanning signal input part of described difference common mode change-over circuit and described common-mode differential change-over circuit
The 8th TCP signal output part connect；For the differential signal that described module receives is turned
It is changed to common-mode signal.
LED display system the most according to claim 1, it is characterised in that described display
Unit also includes LED lamp bead drive circuit, described LED lamp bead drive circuit and described module
Outfan is connected, and is used for driving LED lamp bead to light.
LED display system the most according to claim 1, it is characterised in that described common mode
Signal includes clock signal, latch signal, enable signal, scanning signal and data signal.
LED display system the most according to claim 2, it is characterised in that described reception
Card is additionally operable to gather the environmental variable of described module, and described environmental variable includes around described module
Electromagnetism intensity.
LED display system the most according to claim 4, it is characterised in that described reception
Card is also attached with host computer, for the environmental variable collected transmission being shown to host computer
Show.
6. an interface circuit, it is characterised in that described interface circuit includes sequentially connecting
Common-mode signal input, common-mode differential change-over circuit and the differential signal outputs connect, described common
Mould signal input part, for being connected with the receiving card of LED display system, receives described receiving card and sends
Common-mode signal, wherein, the enable signal input part of described interface circuit and described receiving card
Enable signal output part connect, the clock signal output of clock signal input terminal and described receiving card
End connects, and latch signal input is connected with the latch signal outfan of described receiving card, scanning letter
Number input is connected with the scanning signal output part of described receiving card；Described common-mode differential conversion electricity
Road for being converted into differential signal by described common-mode signal, and described differential signal outputs is used for and institute
The module stating LED display system connects, wherein, and the enable signal output of described interface circuit
End is connected with the enable signal input part of described module, clock signal output terminal and described module time
Clock signal input part connects, and latch signal outfan connects with the latch signal input of described module
Connecing, scanning signal output part is connected with the scanning signal input part of described module；For by described
Differential signal sends to described module.
7. a module, it is characterised in that described module includes the differential signal input being sequentially connected with
End, difference common mode change-over circuit and common-mode signal outfan, described differential signal input is used for
It is connected with the HUB of LED display system, receives described HUB and send the differential signal of coming, its
In, the signal input part that enables of described module is connected with the enable signal output part of described HUB,
The clock signal input terminal of described module is connected with the clock signal output terminal of described HUB, described
The latch signal input of module is connected with the latch signal outfan of described HUB, described module
Scanning signal input part be connected with the scanning signal output part of described HUB；Described difference common mode
Change-over circuit for being converted into common-mode signal by described differential signal, and described common-mode signal outfan is used
In described common-mode signal is sent.
8. the method reducing LED display system electromagnetic interference, it is characterised in that include as
Lower step:
The common-mode signal received is sent to HUB by receiving card；
Described common-mode signal is turned by described HUB by the common-mode differential change-over circuit being disposed thereon
It is changed to differential signal, and described differential signal is sent at least one module；Wherein, described common
First port of mould differential conversion circuit enables the enable signal of signal input part and described receiving card
Outfan connects, the second port clock signal input and the clock signal output terminal of described receiving card
Connecting, the 3rd port latch signal input is connected with the latch signal outfan of described receiving card,
4th TCP signal input part is connected with the scanning signal output part of described receiving card；
After at least one module described receives above-mentioned differential signal, by the difference being disposed thereon
Described differential signal is converted to common-mode signal by common mode change-over circuit；Wherein, described difference common mode turns
Change the fifth port enable letter enabling signal input part and described common-mode differential change-over circuit of circuit
Number outfan connects, and the clock signal input terminal of described difference common mode change-over circuit is poor with described common mode
The 6th port clock signal outfan dividing change-over circuit connects, described difference common mode change-over circuit
Latch signal input and the 7th port latch signal outfan of described common-mode differential change-over circuit
Connect, the scanning signal input part of described difference common mode change-over circuit and described common-mode differential conversion electricity
The 8th TCP signal output part on road connects.
Method the most according to claim 8, it is characterised in that when described common-mode signal includes
Clock signal, latch signal, enable signal, scanning signal and data signal.
Method the most according to claim 8, it is characterised in that at described HUB by described
Differential signal sends at least one module, and at least one module described receives above-mentioned differential signal
After, by the difference common mode change-over circuit being disposed thereon, described differential signal is converted to common mode and believes
Number step after, further comprising the steps of:
Described common-mode signal is sent to LED lamp bead drive circuit, described LED by described module
Pearl drive circuit drives LED lamp bead to light according to described common-mode signal.
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| CN201410313093.3A CN104143315B (en) | 2014-07-02 | 2014-07-02 | LED display system, device and the method reducing LED display system electromagnetic interference |
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| CN201410313093.3A CN104143315B (en) | 2014-07-02 | 2014-07-02 | LED display system, device and the method reducing LED display system electromagnetic interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
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| US9195281B2 (en) | 2013-12-31 | 2015-11-24 | Ultravision Technologies, Llc | System and method for a modular multi-panel display |
| US9311847B2 (en) | 2014-07-16 | 2016-04-12 | Ultravision Technologies, Llc | Display system having monitoring circuit and methods thereof |
| CN105429838B (en) * | 2015-12-31 | 2018-11-30 | 西安诺瓦电子科技有限公司 | LED display system |
| CN106652892B (en) * | 2016-12-26 | 2019-12-24 | 西安诺瓦星云科技股份有限公司 | LED lamp panel module |
| CN106652893B (en) * | 2016-12-26 | 2019-01-29 | 西安诺瓦电子科技有限公司 | LED display control system |
| CN106652894B (en) * | 2016-12-26 | 2018-11-30 | 西安诺瓦电子科技有限公司 | LED display control system |
| CN106652895B (en) * | 2016-12-26 | 2019-01-29 | 西安诺瓦电子科技有限公司 | Scanning card |
| CN106652897B (en) * | 2016-12-26 | 2019-08-23 | 西安诺瓦星云科技股份有限公司 | LED display control system |
| CN106652896B (en) * | 2016-12-26 | 2019-02-26 | 西安诺瓦电子科技有限公司 | Scanning card |
| CN111063318A (en) * | 2018-10-17 | 2020-04-24 | 西安诺瓦星云科技股份有限公司 | Plug-in component, scanning card, display control card and display control system |
| CN111261095A (en) * | 2018-11-15 | 2020-06-09 | 西安诺瓦星云科技股份有限公司 | Connecting assembly, scanning card and display screen system |
| CN109410894B (en) * | 2019-01-08 | 2021-01-26 | 京东方科技集团股份有限公司 | Method and module for generating differential output signal and display device |
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| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
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