CN204229808U - A kind of LED display system, interface circuit and module - Google Patents
A kind of LED display system, interface circuit and module Download PDFInfo
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- CN204229808U CN204229808U CN201420365700.6U CN201420365700U CN204229808U CN 204229808 U CN204229808 U CN 204229808U CN 201420365700 U CN201420365700 U CN 201420365700U CN 204229808 U CN204229808 U CN 204229808U
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Abstract
The utility model discloses a kind of LED display system, interface circuit and module.Described LED display system comprises at least one display unit, described display unit comprises the receiving card connected successively, interface plate HUB and at least one module, described HUB comprises common-mode differential change-over circuit, the common-mode signal input end of described common-mode differential change-over circuit is connected with described receiving card, the differential signal outputs of described common-mode differential change-over circuit is connected with described module, described module comprises difference common mode change-over circuit, the differential signal input of described difference common mode change-over circuit is connected with the differential signal outputs of described common-mode differential change-over circuit, the signal common-mode signal output terminal output common mode signal of described difference common mode change-over circuit.By the way, the utility model, when the increase not affecting frequency is also without the need to overcoat magnet ring, effectively can reduce the electromagnetic interference (EMI) of LED display.
Description
Technical field
The utility model relates to LED and shows field, particularly relates to a kind of LED display system, interface circuit and module.
Background technology
Modern society's digital display technique makes rapid progress, LED display is as a kind of novel numerical monitor 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 plate 102 and at least one module 103, its workflow is generally receiving card 101 and the signal received is sent to HUB 102, HUB 102 again by Signal transmissions to module 103, then to be lighted by module 103 driving LED lamp pearl.But due to LED display operationally, its clock frequency may 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 by beyond the casing formed to multiple module along with power lead, after the electromagnetic wave of high strength is taken out of casing, serious electromagnetic interference (EMI) can be produced in its surrounding environment, affect the normal life of nearby residents, thus, the electromagnetic interference (EMI) how reducing LED display has become a hot issue of those skilled in the art's research.
In currently available technology, the method reducing LED display electromagnetic interference (EMI) mainly contains two kinds, and a kind of is reduce electromagnetic interference (EMI) by the clock frequency of reduction LED display.But due to an important parameter of to be clock frequency be LED display work, closely bound up contacting is had with the parameter such as refreshing frequency and gray shade scale of LED display, although reduce the electromagnetic interference (EMI) that clock frequency decreases LED display in theory, but also reduce other parameters such as refreshing frequency and gray shade scale of signal clock simultaneously, and refreshing frequency reduces, the brightness of LED display can be affected further, have impact on the whole structure of LED display.
The method of another kind of solution LED display electromagnetic interference (EMI) for add magnet ring on signal wire, and the electromagnetic interference (EMI) that absorption signal line produces plays effect undesired signal being carried out to filtering.Although make the effect can playing filtering in this way, but because the internal volume of LED box is generally smaller, and the volume ratio of magnet ring is larger, after magnet ring is added to signal wire, the inner space of meeting heavy compression casing, and because the signal wire of LED box inside is many, need the quantity of magnet ring also more, and often add a magnet ring, capital increases the cost of LED display, and magnet ring is overlapped on signal wire and also have technological requirement, if technological requirement is discontented with the display effect that foot may affect LED display, cause product undesirable.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of LED display system, interface circuit and module, when the increase not affecting frequency is also without the need to overcoat magnet ring, effectively can reduce the electromagnetic interference (EMI) of LED display.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of LED display system, comprise at least one display unit, described display unit comprises the receiving card, interface plate HUB and at least one module that connect successively,
Described HUB comprises common-mode differential change-over circuit, and the common-mode signal input end of described common-mode differential change-over circuit is connected with described receiving card, and the differential signal outputs of described common-mode differential change-over circuit is connected with described module,
Described module comprises difference common mode change-over circuit, the differential signal input of described difference common mode change-over circuit is connected with the differential signal outputs of described common-mode differential change-over circuit, the common-mode signal output terminal output common mode signal of described difference common mode change-over circuit.
Wherein, described display unit also comprises LED lamp bead driving circuit, and described LED lamp bead driving circuit is connected with the output terminal of described module.
Wherein, described receiving card is also connected with host computer.
Wherein, the common-mode signal input end of described common-mode differential change-over circuit comprises enable signal input end, clock signal input terminal, latch signal input end, sweep signal input end and data signal input, is connected respectively with the enable signal output terminal of described receiving card, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output; The differential signal outputs of described common-mode differential change-over circuit comprises enable signal output terminal, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output, is connected respectively with the enable signal input end of module, clock signal input terminal, latch signal input end, sweep signal input end and data signal output.
Wherein, described common-mode differential change-over circuit also comprises power circuit, and the voltage output end of described power circuit is connected with the voltage input end of described common-mode differential change-over circuit.
Wherein, the differential signal input of described difference common mode change-over circuit comprises enable signal input end, clock signal input terminal, latch signal input end, sweep signal input end and data signal input, is connected respectively with the enable signal output terminal of described HUB, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output; The common-mode signal output terminal of described difference common mode change-over circuit comprises enable signal output terminal, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output, is connected respectively with the enable signal input end of described lamp pearl driving circuit, clock signal input terminal, latch signal input end, sweep signal input end and data signal output.
Wherein, described difference common mode change-over circuit also comprises power circuit, and the voltage output end of described power circuit is connected with the voltage input end of described difference common mode change-over circuit.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of interface circuit for described LED display system, described interface circuit comprises the common-mode signal input end, common-mode differential change-over circuit and the differential signal outputs that connect in turn, described common-mode signal input end is used for being connected with the receiving card of LED display system, and described differential signal outputs is used for being connected with the module of described LED display system.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of module for described LED display system, described module comprises the differential signal input, difference common mode change-over circuit and the common-mode signal output terminal that connect in turn, described differential signal input is used for being connected with the HUB of LED display system, described common-mode signal output terminal output common mode signal.
Wherein, described LED display system also comprises LED lamp bead driving circuit, and described LED lamp bead driving circuit is connected with the common-mode signal output terminal of described difference common mode change-over circuit.
The beneficial effects of the utility model are: the situation being different from prior art, common-mode signal is converted to differential signal by adding common-mode differential change-over circuit on HUB by the utility model, utilize the electromagnetic interference (EMI) that the signal value of differential signal produces to offset common-mode signal for the right difference of signal, differential signal also by adding difference common mode change-over circuit on module, then is converted to common-mode signal by the utility model.When the increase not affecting frequency is also without the need to overcoat magnet ring, effectively can reduce that common-mode signal produces in transmitting procedure electromagnetic interference (EMI), and cost is low, also can not reduce the performance of LED display itself.
Accompanying drawing explanation
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 utility model;
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 the utility model LED display system;
Fig. 6 is the structural representation of the another embodiment of the utility model LED display system;
Fig. 7 is the structural representation of the utility model interface circuit one embodiment;
Fig. 8 is the structural representation of the utility model module one embodiment.
Embodiment
Consult Fig. 2, Fig. 2 is the structural representation of the utility model LED display system one embodiment.
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 plate HUB 202 and at least one module 203 that connect successively.
Described HUB 202 comprises common-mode differential change-over circuit 2021, and described common-mode differential change-over circuit 2021 common-mode signal input end is connected with described receiving card 201, and the differential signal outputs of described common-mode differential change-over circuit 2021 is connected with described module 203,
Described module 203 comprises difference common mode change-over circuit 2031, and the differential signal input of described difference common mode change-over circuit 2031 is connected with HUB 202, and common-mode signal output terminal is as the output terminal of described module 203.
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 plate HUB 202, above-mentioned common-mode signal is converted to differential signal by the common-mode differential change-over circuit 2021 on interface plate HUB202, transmitted to the module 203 be connected with HUB 202 by signal wire, because differential signal is that amplitude is equal, the two paths of signals that phase place is contrary, the induction electromotive force of the generation in its signals transmission is contrary, thus the magnetic field produced by induction electromotive force is also that intensity is identical, direction is contrary, in transmitting procedure, the two can be offset completely, effectively reduce the electromagnetic interference (EMI) produced in signals transmission.
Fig. 3 A is the power circuit of common-mode differential change-over 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 change-over circuit, its middle port OE1+, CLK1+, LAT1+ and A1+ are the common-mode signal input end of common-mode differential change-over circuit, represent input common-mode signal, accordingly, port OE1-, CLK1-, LAT1-and A1-are the differential signal outputs of common-mode differential change-over circuit, represent output difference sub-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 Figure 3 C, in Fig. 3 C, input voltage is 3.3V.First port of the common-mode differential change-over circuit shown by Fig. 3 C is enable signal input end OE1 (being equivalent to the port OE1+ 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), 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).First port of common-mode differential change-over circuit, second port, 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 the enable signal receiving receiving card output, clock signal, latch signal and sweep signal, in addition, the common-mode signal input end of common-mode differential change-over circuit also comprises data signal input (not shown), described data signal input is connected with the data signal output of receiving card, for transmission of data signals.
Common-mode differential change-over circuit receives by common-mode signal input end above-mentioned enable signal that receiving card exports, clock signal, latch signal, sweep signal and data-signal are common-mode signal, described common-mode signal is that refer to amplitude is identical, the signal that phase place is also identical, and the differential signal signal that to be refer to amplitude identical, phase place is contrary, common-mode differential change-over 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 change-over circuit is enable signal output terminal OE1-(being equivalent to the port OE1-in Fig. 3 B), 6th port is clock signal output terminal CLK1-(being equivalent to the port CLK1-in Fig. 3 B), 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).The five-port of common-mode differential change-over circuit, the 6th port, the 7th port and the 8th port are connected with the enable signal input end of module, clock signal input terminal, latch signal input end and sweep signal input end respectively, the enable signal, clock signal, latch signal, the sweep signal that have been converted to differential signal is exported respectively to module, common-mode differential change-over circuit also comprises data signal output (not shown) simultaneously, be connected with the data signal input of module, export the data-signal being also converted to differential signal to module.
And due to LED display general work signal be common-mode signal, thus, module 203, when outwards outputing 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 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 the 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.First port of the difference common mode change-over circuit shown by Fig. 4 C is enable signal input end OE-(not indicating in Fig. 4 B), second port is clock signal input terminal CLK-(being equivalent to the port CLK-in Fig. 4 B), 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).First port of difference common mode change-over circuit, second port, 3rd port and the 4th port respectively with the enable signal output terminal of the common-mode differential change-over circuit be arranged on HUB, clock signal output terminal, latch signal output terminal and sweep signal output terminal are connected, for receiving the enable signal that HUB exports, 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 (not shown), described data signal input is connected with the data signal output 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 is received by differential signal input 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), 6th port is clock signal output terminal CLK (being equivalent to the port CLK+ in Fig. 4 B), 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).The five-port of difference common mode change-over circuit, the 6th port, the 7th port and the 8th port are connected with the enable signal input end of lamp pearl driving circuit, clock signal input terminal, latch signal input end and sweep signal input end respectively, and the data signal output of difference common mode change-over circuit is connected with the data signal input 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, common-mode signal is converted to differential signal by adding common-mode differential change-over circuit on HUB by the LED display system of present embodiment, utilize the electromagnetic interference (EMI) that the signal value of differential signal produces to offset common-mode signal for the right difference of signal, differential signal also by adding difference common mode change-over circuit on module, then is converted to common-mode signal by the utility model.When not affecting the increase of frequency also without the need to effectively reducing the electromagnetic interference (EMI) that common-mode signal produces in transmitting procedure when overcoat magnet ring, 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 the utility model LED display system.In order to the physical property when size and LED that better obtain electromagnetism intensity in LED display surrounding environment work, receiving card 301 is also for gathering the environmental variance around LED display screen, described environmental variance comprises the electromagnetism intensity around described module, and receiving card 301 is also for gathering physical parameter when module 303 works.And the physical parameter of the environmental variance collected around module 303 and module is uploaded to host computer 304 for user reference is provided.The monitoring of the electromagnetic interference (EMI) to LED display can be realized more accurately.
Consult Fig. 7, Fig. 7 is the structural representation of the utility model interface circuit one embodiment.The interface circuit 400 of present embodiment comprises the common-mode signal input end 401, common-mode differential change-over circuit 402 and the differential signal outputs 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 change-over circuit 402 is for converting described common-mode signal to differential signal, described differential signal outputs 403 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 circuit of present embodiment comprises the common-mode signal input end, common-mode differential change-over circuit, the differential signal outputs that connect successively, also be sent to module without the need to can the common-mode signal that receiving card sends be converted to differential signal when overcoat magnet ring in the increase not affecting frequency, effectively can reduce the electromagnetic interference (EMI) that LED display system produces.
Consult Fig. 8, Fig. 8 is the structural representation of the utility model module one embodiment.The module 500 of present embodiment comprises the differential signal input 501, difference common mode change-over circuit 502 and the common-mode signal output terminal 503 that connect in turn, described differential signal input 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, difference common mode change-over circuit, the common-mode signal output terminal that connect successively, the differential signal sent that HUB can be sent converts differential signal to and sends, to make LED display system lightening LED lamp pearl further, in the increase not affecting frequency also without the need to the electromagnetic interference (EMI) that LED display system produces effectively can be reduced when overcoat magnet ring.
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 plate HUB and at least one module that connect successively,
Described HUB comprises common-mode differential change-over circuit, and the common-mode signal input end of described common-mode differential change-over circuit is connected with described receiving card, and the differential signal outputs of described common-mode differential change-over circuit is connected with described module,
Described module comprises difference common mode change-over circuit, the differential signal input of described difference common mode change-over circuit is connected with the differential signal outputs of described common-mode differential change-over circuit, the common-mode signal output terminal output common mode signal of described difference common mode change-over circuit.
2. LED display system according to claim 1, is characterized in that, described display unit also comprises LED lamp bead driving circuit, and described LED lamp bead driving circuit is connected with the common-mode signal output terminal of described difference common mode change-over circuit.
3. LED display system according to claim 1, is characterized in that, described receiving card is also connected with host computer.
4. LED display system according to claim 1, it is characterized in that, the common-mode signal input end of described common-mode differential change-over circuit comprises enable signal input end, clock signal input terminal, latch signal input end, sweep signal input end and data signal input, is connected respectively with the enable signal output terminal of described receiving card, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output; The differential signal outputs of described common-mode differential change-over circuit comprises enable signal output terminal, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output, is connected respectively with the enable signal input end of module, clock signal input terminal, latch signal input end, sweep signal input end and data signal output.
5. LED display system according to claim 4, it is characterized in that, described common-mode differential change-over circuit also comprises power circuit, and the voltage output end of described power circuit is connected with the voltage input end of described common-mode differential change-over circuit.
6. LED display system according to claim 2, it is characterized in that, the differential signal input of described difference common mode change-over circuit comprises enable signal input end, clock signal input terminal, latch signal input end, sweep signal input end and data signal input, is connected respectively with the enable signal output terminal of described HUB, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output; The common-mode signal output terminal of described difference common mode change-over circuit comprises enable signal output terminal, clock signal output terminal, latch signal output terminal, sweep signal output terminal and data signal output, is connected respectively with the enable signal input end of described lamp pearl driving circuit, clock signal input terminal, latch signal input end, sweep signal input end and data signal output.
7. LED display system according to claim 6, it is characterized in that, described difference common mode change-over circuit also comprises power circuit, and the voltage output end of described power circuit is connected with the voltage input end of described difference common mode change-over circuit.
8. the interface circuit for LED display system according to claim 1, it is characterized in that, described interface circuit comprises the common-mode signal input end, common-mode differential change-over circuit and the differential signal outputs that connect in turn, described common-mode signal input end is used for being connected with the receiving card of LED display system, and described differential signal outputs is used for being connected with the module of described LED display system.
9. the module for LED display system according to claim 1, it is characterized in that, described module comprises the differential signal input, difference common mode change-over circuit and the common-mode signal output terminal that connect in turn, described differential signal input is used for being connected with the HUB of LED display system, described common-mode signal output terminal output common mode signal.
10. module according to claim 9, is characterized in that, described LED display system also comprises LED lamp bead driving circuit, and described LED lamp bead driving circuit is connected with the common-mode signal output terminal of described difference common mode change-over circuit.
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| CN201420365700.6U CN204229808U (en) | 2014-07-02 | 2014-07-02 | A kind of LED display system, interface circuit and module |
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| CN201420365700.6U CN204229808U (en) | 2014-07-02 | 2014-07-02 | A kind of LED display system, interface circuit and module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
| US10373535B2 (en) | 2013-12-31 | 2019-08-06 | Ultravision Technologies, Llc | Modular display panel |
| US10706770B2 (en) | 2014-07-16 | 2020-07-07 | Ultravision Technologies, Llc | Display system having module display panel with circuitry for bidirectional communication |
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2014
- 2014-07-02 CN CN201420365700.6U patent/CN204229808U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
| US10373535B2 (en) | 2013-12-31 | 2019-08-06 | Ultravision Technologies, Llc | Modular display panel |
| US10380925B2 (en) | 2013-12-31 | 2019-08-13 | Ultravision Technologies, Llc | Modular display panel |
| US10410552B2 (en) | 2013-12-31 | 2019-09-10 | Ultravision Technologies, Llc | Modular display panel |
| US10540917B2 (en) | 2013-12-31 | 2020-01-21 | Ultravision Technologies, Llc | Modular display panel |
| US10871932B2 (en) | 2013-12-31 | 2020-12-22 | Ultravision Technologies, Llc | Modular display panels |
| US10706770B2 (en) | 2014-07-16 | 2020-07-07 | Ultravision Technologies, Llc | Display system having module display panel with circuitry for bidirectional communication |
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