CN107257262A - A kind of display control unit, display system and display synchronous method - Google Patents
A kind of display control unit, display system and display synchronous method Download PDFInfo
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- CN107257262A CN107257262A CN201710317899.3A CN201710317899A CN107257262A CN 107257262 A CN107257262 A CN 107257262A CN 201710317899 A CN201710317899 A CN 201710317899A CN 107257262 A CN107257262 A CN 107257262A
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- display control
- control unit
- clock
- clock information
- interchanger
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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Abstract
The present embodiments relate to video display technology field, more particularly to a kind of display control unit, display system and display synchronous method, including：The network interface card of display control unit obtains the first clock information from the interchanger with clock information ability；The processing unit of the display control unit extracts first clock frequency from first clock information；The video data stream received from the interchanger is output to mosaic screen with reference to first clock frequency and shown by the processing unit of the display control unit, it can be seen that, the clock of each display control unit can be synchronous with the clock holding of interchanger, shown so as to which video data stream can be output to mosaic screen by each display control unit with reference to the clock frequency of interchanger, because each display control unit can realize that clock is synchronous by interchanger, special purpose interface need not be provided, therefore, it is possible to reduce cost.
Description
Technical field
The present embodiments relate to video display technology field, more particularly to a kind of display control unit, display system and
Show synchronous method.
Background technology
In display control field, generally require to be divided into piece image into different display control units, final output is arrived
Mosaic screen carries out tiled display, and the key of display effect is the synchronism between different display control units.
In the prior art, the synchronization between different display control units is mainly realized by following three kinds of modes.
Mode one, using special clock interface synchronization, the requirement of this synchronous foundation is designed with special clock sync cap, and
The clock connection being used for equipped with special cable between different display control units, is realized synchronous.
Mode two, using HDMI, (High Definition Multimedia Interface, high-definition multimedia connects
Mouthful) ring goes out mode and enter that row clock is synchronous, this method of synchronization is by a special HDMI in different display control units
Transmit clock.
Mode three, the method analyzed based on software Ethernet protocol frame enter row clock synchronization, and this method of synchronization is mainly
Based on software, by adding timestamp in Ethernet protocol frame, and the mode of synchronous package is constantly sent out.
Although aforesaid way one can realize very high synchronization accuracy, it is special that each display control unit is required to arrangement
Door cable, increases the complexity and hardware cost of wiring, meanwhile, the quality of clock is influenceed larger by cable quality, large-scale
Splicing project in stability and reliability it is poor.Although aforesaid way two can also realize very high synchronization accuracy, often
Individual display control unit is required to clock between one HDMI of many increases, different display control units and connected by HDMI cable
Connect, cost increase is more.Although aforesaid way three need not increase extra cost, synchronous effect depends on CPU to same
The parsing and constantly transmission of bag are walked, precision is difficult to accomplish very high, typically in millisecond rank.
As can be seen that can realize that the method for very high synchronization accuracy is required for increasing special interface use in the prior art
In synchronization, and increase special interface be used for it is synchronous can bring the increase of cost, while due to needs in large-scale splicing project
Arrange special cable, can cause construction it is more complicated, Reliability comparotive is low, and the clock for being based entirely on software synchronously realizes precision
On be difficult to reach requirement, therefore, be badly in need of a kind of video frequency output synchronous method of low-cost and high-precision.
The content of the invention
The embodiment of the present invention provides a kind of display control unit, display system and display synchronous method, to realize it is low into
This high-precision video frequency output is synchronous.
In order to achieve the above object, the embodiment of the present invention provides a kind of display control unit, including：
Network interface card, for receiving the first clock information from the interchanger with clock information ability, and during by described first
Clock information is sent to processing unit；
Processing unit, is electrically connected with the network interface card, for receiving first clock information and video counts from the network interface card
According to stream, and for being extracted from first clock information after the first clock frequency, by the video data stream with reference to described
First clock frequency is output to mosaic screen and shown.
Preferably, also including：Clock phase-locked loop；
The clock phase-locked loop, is electrically connected with the network interface card, for receiving first clock information from the network interface card, and
Second clock information is obtained for handling the first clock information progress；
The clock phase-locked loop, is also electrically connected with the processing unit, for the second clock information to be sent into institute
Processing unit is stated, so that the processing unit is extracted after second clock frequency from the second clock information, is regarded described
Frequency data stream is shown with reference to the second clock rate-adaptive pacemaker to mosaic screen.
Preferably, the network interface card, it is additionally operable to receive the second clock information from the clock phase-locked loop, and by described the
Two clock informations are sent to next display control unit.
The embodiment of the present invention provides a kind of display system, includes multiple display control units；The multiple display control list
It is first with the same interchanger connection with clock information ability and one of each display control unit corresponding mosaic screen respectively
Point.
Preferably, the multiple display control unit is sequentially cascaded.
The embodiment of the present invention also provides a kind of display system, includes multiple display control units and multiple switch；Each
Display control unit corresponds to a part for mosaic screen respectively；
The multiple interchanger includes host exchange with clock information ability and from interchanger；The host exchange with
It is described from exchange mechatronics, the first clock information for obtaining the host exchange；
M display control unit in the multiple display control unit is electrically connected with the host exchange；It is the multiple
N number of display control unit in display control unit is with described from exchanging mechatronics.
The embodiment of the present invention provides a kind of display system, includes display control unit；Each display control unit is right respectively
Answer a part for mosaic screen；Wherein, main display control unit is connected with the interchanger with clock information ability, secondary display control
Unit is sequentially cascaded with the main display control unit.
The embodiment of the present invention provides a kind of display synchronous method, including：
The network interface card of display control unit obtains the first clock information from the interchanger with clock information ability；
The processing unit of the display control unit extracts first clock frequency from first clock information；
The processing unit of the display control unit will be received with reference to first clock frequency from the interchanger
Video data stream is output to mosaic screen and shown.
Preferably, the network interface card in display control unit obtains the first clock letter from the interchanger with clock information ability
After breath, in addition to：
First clock information is sent to the clock phase-locked loop of the display control unit by the network interface card of display control unit
Ring；
The clock phase-locked loop of the display control unit obtained after handling first clock information second when
Clock information, and the second clock information is sent to the processing unit of the display control unit；
The processing unit of the display control unit extracts first clock frequency from first clock information,
Including：
The processing unit of the display control unit extracts the second clock frequency from the second clock information；
The processing unit of the display control unit will be received with reference to first clock frequency from the interchanger
Video data stream is output to mosaic screen and shown, including：
The processing unit of the display control unit will be received with reference to the second clock frequency from the interchanger
Video data stream is output to mosaic screen and shown.
Preferably, the network interface card of the display control unit obtains the first clock from the interchanger with clock information ability
Information, including：
The network interface card of P display control unit obtains the first clock letter from the first interchanger with clock information ability
Breath；
The network interface card of Q display control unit obtains described first from the second switch of first switch concatenation
Clock information；Wherein, the second switch obtains first clock information from first interchanger；The P display
Control unit and the Q display control unit correspond to a part for mosaic screen respectively.
Display control unit, display system and display synchronous method that above-described embodiment is provided, including：Display control unit
Network interface card the first clock information is obtained from the interchanger with clock information ability；The processing unit of the display control unit
First clock frequency is extracted from first clock information；The processing unit of the display control unit is with reference to described
The video data stream received from the interchanger is output to mosaic screen and shown by the first clock frequency, it can be seen that each
The clock of display control unit can be synchronous with the clock holding of interchanger, so that each display control unit can be with reference to exchange
Video data road is output to mosaic screen and shown by the clock frequency of machine, because each display control unit can pass through interchanger
Realize that clock is synchronous, without providing special purpose interface, therefore, it is possible to reduce cost.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly introduced.
Fig. 1 is a kind of structural representation of display control unit provided in an embodiment of the present invention；
Fig. 2 is the structural representation of another display control unit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of display system provided in an embodiment of the present invention；
Fig. 4 is the structural representation of another display system provided in an embodiment of the present invention；
Fig. 5 is the structural representation of another display system provided in an embodiment of the present invention；
Fig. 6 is the structural representation of another display system provided in an embodiment of the present invention；
Fig. 7 is a kind of flow chart for showing synchronous method provided in an embodiment of the present invention.
Embodiment
In order that the purpose of the present invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, it is not intended to limit the present invention.
Fig. 1 illustrates a kind of structural representation of display control unit provided in an embodiment of the present invention, such as Fig. 1 institutes
Show, the display control unit may include：
Network interface card 10, for receiving the first clock information from the interchanger with clock information ability, and by this first when
Clock information is sent to processing unit 20.Processing unit 20, is electrically connected with network interface card 10, for receiving first clock from network interface card 10
Information and video data stream, processing unit 20 after the first clock information is received from network interface card 10, be additionally operable to from first when
The first clock frequency is extracted in clock information, and by the video data stream received from network interface card 10 with reference to from the first clock information
The first clock frequency extracted is output to mosaic screen and shown.
In order to faster extract clock frequency, on the basis of the display control unit shown in Fig. 1, this hair
Bright embodiment also provides another display control unit.
Wherein, the interchanger with clock information ability mainly used Sync-E (Synchronous Ethernet,
Synchronous ethernet) simultaneous techniques, processing unit can be CPU (Central Processing Unit, central processing unit),
Therefore, the network interface card of display control unit can recover the first clock information entrained by it in physical layer from network signal,
The network interface card of display control unit, can be by the first clock after the first clock information entrained by it is recovered from network signal
Information is sent to the CPU of the display control unit, so that the CPU of the display control unit can be from the first clock information
The first clock frequency is extracted, and the video data stream received from the network interface card of display control unit is believed with reference to from the first clock
The first clock frequency extracted in breath is output to mosaic screen and shown.
Because the interchanger with clock information ability has mainly used Sync-E simultaneous techniques, network interface card can be from ether
Clock information is recovered in net, this process is built upon physical layer, therefore, do not influenceed by data pack receiving and transmitting, while also not
The transmitting-receiving of packet is influenceed, such display control unit can either receive clock information by interchanger can also receive video counts
According to stream.
Fig. 2 illustrates the structural representation of another display control unit provided in an embodiment of the present invention, such as Fig. 2
Shown, the display control unit may also include：Clock phase-locked loop 30.
Clock phase-locked loop 30, is electrically connected with network interface card 10, for receiving the first clock information from network interface card 10, and for first
Clock information progress, which is handled, obtains second clock information.
Specifically, clock phase-locked loop 30 can carry out debounce processing to the first clock information obtains second clock information.
Clock phase-locked loop 30, is also electrically connected with processing unit 20, for second clock information to be sent into processing unit 20,
So that processing unit 20 is extracted from second clock information after second clock frequency, by video data stream with reference to second clock frequency
Rate is output to mosaic screen and shown.
Specifically, clock phase-locked loop 30 is sent to the second clock information of processing unit 20, it can also be to the first information
Carry out the clock information after frequency multiplication debounce processing.For example, the frequency of the first clock information is 30Hz, and after frequency multiplication debounce
The frequency of second clock information can be 60Hz.
Optionally, network interface card 10 can also be used to receive second clock information from clock phase-locked loop 30, and by second clock information
As the transmission reference clock of network interface card, the network interface card for being connected to next display control unit is sent to next display control list
Member.On the basis of the display control unit shown in Fig. 1 or Fig. 2, the embodiment of the present invention also provides a kind of display system.
Fig. 3 illustrates a kind of structural representation of display system provided in an embodiment of the present invention, as shown in figure 3,
The display system may include：Multiple display control units, multiple display control units can be display control unit 1, display control
Unit 2 processed, display control unit 3 and display control unit k, and display control unit 1, display control unit 2, display control
Unit 3 and display control unit k processed are connected with the same interchanger with clock information ability, in addition display control list
Member 1, display control unit 2, display control unit 3 and display control unit k also correspond to a part for mosaic screen respectively.
From figure 3, it can be seen that display control unit 1, display control unit 2, display control unit 3 and display control
Clock source in unit k is all from same interchanger, when the interchanger of selection supports SYNC-E functions, it is ensured that display control
Unit 1, display control unit 2, display control unit 3 and display control unit k clock it is synchronous, so as to ensure display control
Unit 1 processed, display control unit 2, display control unit 3 and display control unit k will be each aobvious with reference to identical clock frequency
Show that video data stream that control unit is respectively received is output to mosaic screen and shown.
It should be noted that display control unit 1, display control unit 2, display control unit 3 and display control list
First k can be the display control unit shown in Fig. 1, or the display control unit shown in Fig. 2.Optionally, display control
Can also sequentially it be connected between unit 1, display control unit 2, display control unit 3 and display control unit k, referring to Fig. 4.
Between display control unit 1, display control unit 2, display control unit 3 and display control unit k sequentially
During connection, if netting twine between interchanger and any display control unit occurs abnormal, for example, display control unit 2 with
When netting twine between interchanger occurs abnormal, display control unit 2 can obtain clock information by display control unit 1, so that
When netting twine between display control unit 2 and interchanger occurs abnormal, it still ensure that display control unit 2 is controlled with display
The clock source of unit 1 processed, display control unit 3 and display control unit k is homologous.
Simplified, in order to which whole engineering construction and wiring are simplified, interchanger can be directly saved to time display control
Main display control unit and interchanger, are only attached, obtain clock and data message by the netting twine connection of unit.Display control
Unit 1 and display control unit 2, display control unit 2 and display control unit 3, display control unit k-1 and display control list
First k is cascaded successively, obtains clock and data message from upper level, and carry out output display.
The maximum display control unit that can be connect beyond single switch when the display control unit that interchanger is connect
When, machine extension can also be swapped, therefore, on the basis of the display control unit shown in Fig. 1 or Fig. 2, the present invention is real
Apply example and another display system is also provided.
Fig. 5 illustrates the structural representation of another display system provided in an embodiment of the present invention, such as Fig. 5 institutes
Show, the display system may include multiple display control units and multiple switch；Each display control unit corresponds to splicing respectively
A part for screen.
Wherein, multiple switch includes host exchange with clock information ability and from interchanger；Host exchange with from
Mechatronics are exchanged, the first clock information for obtaining host exchange is used for from interchanger.
From figure 5 it can be seen that M display control unit in multiple display control units is electrically connected with host exchange,
I.e. display control unit 11, display control unit 12, display control unit 13 and display control unit M and host exchange are electrically connected
Connect, therefore, it is ensured that display control unit 11, display control unit 12, display control unit 13 and display control unit M
Clock is synchronous with the clock of host exchange.N number of display control unit in the multiple display control unit with from exchanging electromechanics
Connection, i.e. display control unit 21, display control unit 22, display control unit 23 and display control unit N with from exchanging
Mechatronics, therefore, it is ensured that display control unit 21, display control unit 22, display control unit 23 and display control
Unit N clock is synchronous with the clock from interchanger, and from the clock of interchanger and the clock of host exchange be it is synchronous, because
This, it is ensured that display control unit 11, display control unit 12, display control unit 13, display control unit M, display control
Unit 21, display control unit 22, display control unit 23 and display control unit N clock are synchronous.And due to
It is display control unit 11, display control unit 12, display control unit 13, display control unit M, display control unit 21, aobvious
Show that control unit 22, display control unit 23 and display control unit N correspond to a part for mosaic screen respectively, therefore, it is possible to
Ensure display control unit 11, display control unit 12, display control unit 13, display control unit M, display control unit
21st, display control unit 22, display control unit 23 and display control unit N are with reference to identical clock frequency output video counts
According to stream, so as to ensure the synchronization for splicing video.
It should be noted that the multiple display control units electrically connected with host exchange can be the display control shown in Fig. 1
Unit processed, or the display control unit shown in Fig. 2, i.e. display control unit 11, display control unit 12, display control
Unit 13 and display control unit M can be the display control unit shown in Fig. 1, or the display control list shown in Fig. 2
Member.With from exchange mechatronics it is multiple from display control unit can be the display control unit shown in Fig. 1, or figure
Display control unit shown in 2, i.e. display control unit 21, display control unit 22, display control unit 23 and display control
Unit N can be the display control unit shown in Fig. 1, or the display control unit shown in Fig. 2.Connect when interchanger
During the maximum display control unit that display control unit can connect beyond single switch, in order to save switch resource,
Therefore, on the basis of based on the display control unit shown in Fig. 1 or Fig. 2, the embodiment of the present invention also provides another display system
System.
Fig. 6 illustrates the structural representation of another display system provided in an embodiment of the present invention, such as Fig. 6 institutes
Show, the display system may include：Multiple display control units, each display control unit corresponds to a part for mosaic screen respectively；
Wherein, main display control unit is connected with the interchanger of clock information ability, secondary display control unit sequentially with main display
Control unit is cascaded.
From fig. 6 it can be seen that multiple main display control units are display control unit 31, display control unit 32, shown
Show control unit 33 and display control unit X, and display control unit 31, display control unit 32, display control unit
33 and display control unit X is connected with the interchanger with clock information ability, therefore, it is ensured that display control unit
31st, the clock of display control unit 32, display control unit 33 and display control unit X is synchronous with interchanger；It is multiple
Secondary display control unit is display control unit 41, display control unit 42, display control unit 43 and display control unit
Y, and secondary display control unit is display control unit 41, display control unit 42, display control unit 43 and display control
Unit Y processed sequentially with main display control unit cascade, therefore, it is ensured that the clock of secondary display control unit and main display control list
The clock of member is synchronous, that is, ensure that display control unit 41, display control unit 42, display control unit 43, display
Control unit Y and display control unit 31, display control unit 32, display control unit 33 and display control unit X when
Clock is synchronous.Again because multiple main display control units and multiple display control units correspond to one of mosaic screen respectively
Point.That is display control unit 31, display control unit 32, display control unit 33, display control unit X, display control unit
31st, display control unit 32, display control unit 33 and display control unit Y correspond to a part for mosaic screen respectively, therefore,
It ensure that display control unit 41, display control unit 42, display control unit 43, display control unit Y and display control
Unit 31, display control unit 32, display control unit 33 and display control unit X are regarded with reference to the output of identical clock frequency
Frequency data stream, so as to ensure the synchronization for splicing video.
It should be noted that multiple main display control units can be the display control unit shown in Fig. 1, or figure
Display control unit shown in 2, i.e. display control unit 31, display control unit 32, display control unit 33 and display control
Unit X can be the display control unit shown in Fig. 1, or the display control unit shown in Fig. 2.Multiple display controls
Unit can be the display control unit shown in Fig. 1, or the display control unit shown in Fig. 2, i.e. display control unit
41st, display control unit 42, display control unit 43 and display control unit N can be the display control unit shown in Fig. 1,
Can be the display control unit shown in Fig. 2.
On the basis of the system that the display control unit and above-described embodiment provided based on above-described embodiment is provided, this hair
Bright embodiment also provides a kind of display synchronous method.
Fig. 7 illustrates a kind of flow chart for showing synchronous method provided in an embodiment of the present invention, as shown in fig. 7,
This method may include：
S701, the network interface card of display control unit obtain the first clock information from the interchanger with clock information ability.
S702, the processing unit of display control unit extract the first clock frequency from the first clock information.
The video data that S703, the processing unit of display control unit will be received with reference to the first clock frequency from interchanger
Stream is output to mosaic screen and shown.
After the network interface card of display control unit obtains the first clock information from the interchanger with clock information ability,
First clock information can also be sent to the clock phase-locked loop of display control unit by the network interface card of display control unit.
Optionally, when the clock phase-locked loop of display control unit can also handle obtain second to the first clock information progress
Clock information, and second clock information is sent to the processing unit of display control unit.The processing unit of display control unit from
Second clock frequency is extracted in second clock information, the processing unit of display control unit will be from friendship with reference to second clock frequency
The video data stream received of changing planes is output to mosaic screen and shown.
In above-mentioned steps S701, the network interface card of display control unit obtains from the interchanger with clock information ability
During one clock information, from the first interchanger with clock information ability the can be obtained by the network interface card of P display control unit
One clock information, when the network interface card of Q display control unit obtains first from and the second switch of the first switch concatenation
Clock information realization, wherein, second switch obtains the first clock information from the first interchanger, and P display control unit and Q show
Show that control unit corresponds to a part for mosaic screen respectively.
According to the above as can be seen that display control unit provided in an embodiment of the present invention, display system and display are same
One step process, including：The network interface card of display control unit obtains the first clock information from the interchanger with clock information ability；Institute
The processing unit for stating display control unit extracts first clock frequency from first clock information；The display control
The video data stream received from the interchanger is output to spelling by the processing unit of unit processed with reference to first clock frequency
Connect screen to be shown, it can be seen that the clock of each display control unit can be synchronous with the clock holding of interchanger, so that each aobvious
Show that video data road can be output to mosaic screen with reference to the clock frequency of interchanger and be shown by control unit, due to each aobvious
Show that control unit can realize that clock is synchronous by interchanger, without providing special purpose interface, therefore, it is possible to reduce cost.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method or computer program product.
Therefore, the present invention can be using the embodiment in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Form.Deposited moreover, the present invention can use to can use in one or more computers for wherein including computer usable program code
The shape for the computer program product that storage media is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
Formula.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of display control unit, it is characterised in that including：
Network interface card, believes for receiving the first clock information from the interchanger with clock information ability, and by first clock
Breath is sent to processing unit；
Processing unit, is electrically connected with the network interface card, for receiving first clock information and video data stream from the network interface card,
And for being extracted from first clock information after the first clock frequency, during by the video data stream with reference to described first
Clock rate-adaptive pacemaker is shown to mosaic screen.
2. display control unit as claimed in claim 1, it is characterised in that also include：Clock phase-locked loop；
The clock phase-locked loop, is electrically connected with the network interface card, for receiving first clock information from the network interface card, and is used for
The first clock information progress is handled and obtains second clock information；
The clock phase-locked loop, is also electrically connected with the processing unit, for the second clock information to be sent into the place
Unit is managed, so that the processing unit is extracted after second clock frequency from the second clock information, by the video counts
Shown according to stream with reference to the second clock rate-adaptive pacemaker to mosaic screen.
3. display control unit as claimed in claim 2, it is characterised in that the network interface card, is additionally operable to from the clock phase-locked loop
Ring receives the second clock information, and the second clock information is sent into next display control unit.
4. a kind of display system, it is characterised in that include multiple display control units as described in any one of claims 1 to 3；
The multiple display control unit is connected and each display control unit point with the same interchanger with clock information ability
Not Dui Ying mosaic screen a part.
5. system is shown as claimed in claim 4, it is characterised in that the multiple display control unit is sequentially cascaded.
6. a kind of display system, it is characterised in that include multiple display control units as described in any one of claims 1 to 3
And multiple switch；Each display control unit corresponds to a part for mosaic screen respectively；
The multiple interchanger includes host exchange with clock information ability and from interchanger；The host exchange with it is described
From exchange mechatronics, the first clock information for obtaining the host exchange；
M display control unit in the multiple display control unit is electrically connected with the host exchange；The multiple display
N number of display control unit in control unit is with described from exchanging mechatronics.
7. a kind of display system, it is characterised in that include multiple display control units as described in any one of claims 1 to 3；
Each display control unit corresponds to a part for mosaic screen respectively；Wherein, main display control unit is with having clock information ability
Interchanger connection, secondary display control unit sequentially cascades with the main display control unit.
8. one kind shows synchronous method, it is characterised in that including：
The network interface card of display control unit obtains the first clock information from the interchanger with clock information ability；
The processing unit of the display control unit extracts first clock frequency from first clock information；
The video that the processing unit of the display control unit will be received with reference to first clock frequency from the interchanger
Data flow is output to mosaic screen and shown.
9. method as claimed in claim 8, it is characterised in that display control unit network interface card from clock information ability
Interchanger in obtain the first clock information after, in addition to：
First clock information is sent to the clock phase-locked loop of the display control unit by the network interface card of display control unit；
The second clock letter that the clock phase-locked loop of the display control unit is obtained after handling first clock information
Breath, and the second clock information is sent to the processing unit of the display control unit；
The processing unit of the display control unit extracts first clock frequency from first clock information, bag
Include：
The processing unit of the display control unit extracts the second clock frequency from the second clock information；
The video that the processing unit of the display control unit will be received with reference to first clock frequency from the interchanger
Data flow is output to mosaic screen and shown, including：
The video that the processing unit of the display control unit will be received with reference to the second clock frequency from the interchanger
Data flow is output to mosaic screen and shown.
10. method as claimed in claim 8, it is characterised in that the network interface card of the display control unit is from clock information
The first clock information is obtained in the interchanger of ability, including：
The network interface card of P display control unit obtains the first clock information from the first interchanger with clock information ability；
The network interface card of Q display control unit obtains first clock from the second switch of first switch concatenation
Information；Wherein, the second switch obtains first clock information from first interchanger；The P display control
Unit and the Q display control unit correspond to a part for mosaic screen respectively.
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