CN107610639A - Transmission method, transmitting device and the drive device of video data - Google Patents
Transmission method, transmitting device and the drive device of video data Download PDFInfo
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Abstract
This application discloses the transmission method of video data, transmitting device and drive device.The transmission method includes：Using the first clock frequency, the video data corresponding with image frame is received；By the partitioning video data into multiple subdatas, the multiple subdata represents the display data in a part of region of described image picture respectively；And second clock frequency is used, by least some subdata transmitted in parallel in the multiple subdata to LED display, wherein, the second clock frequency is less than first clock frequency.The transmission method is connected up, so as to be easily assembled large scale LED display over long distances by the way that partitioning video data is carried out into frequency reducing transmission into subdata with reducing data transfer cost and realizing.
Description
Technical field
The present invention relates to display technology field, more particularly, to a kind of transmission of the video data for LED display
Method, transmitting device and drive device.
Background technology
The pixel element of LED display is light emitting diode (LED).LED display has the superiority of following aspect：It is high
GTG, wide visible angle, abundant color and customizable screen shape.Therefore, light-emitting diode display is widely used in work
The every field such as industry, traffic, commercial advertisement, information issue, sports tournament.
Fig. 1 shows the drive device of LED display of the prior art.As shown in figure 1, drive device 100 includes passing
Defeated device 110 and multiple reception devices 120.Transmitting device 110 is used to receive video content from host computer with standard agreement, will regard
After frequency contents processing, vision signal DATA and clock signal clk are transferred to connected reception device 120.Multiple receptions
Device 120 is sequentially connected in series, and for receiving data at transmitting device 110, and drives the display portion video of display screen 130 respectively
Content.Each reception device 120 includes receiving module 121 and LED drive module 122.Receiving module 121 receives video content
Afterwards, next receiving module 121 and LED drive modules 122 are passed to.
LED display 130 is for example spliced by LED module, respectively including multiple LEDs.During operation, transmission dress
Put 110 and be transferred to connected receiving module 121 after host computer reception video content processing.Reception mould of the video content in concatenation
Transmitted step by step in block 121.Each LED drive modules 122 can latch relative video content, and drive LED with
Related video content is shown, so as to show a part of region of video pictures.Multiple LED of LED display 130 are multiple
Under the driving of LED drive module 122, complete video pictures are collectively constituted.
Transmitting device 110 and the host-host protocol of reception device 120, mainly include data forwarding scheme and protocol conversion side
Case.
In data forwarding scheme, transmitting device 110 uses same host-host protocol and frame per second with reception device 120.
For example with HDMI, (High Definition Multimedia Interface, high-definition multimedia connect transmitting device 110
Mouthful) agreement receives video content, also with HDMI agreements to the transmitted video content of reception device 120.This scheme is still with former ratio
Special rate transmitted video content, advantage are signal stabilizations, it is not necessary to extra conversion are carried out to agreement, frame per second is high.Shortcoming is that HDMI is passed
Defeated line cost is high；And it is not easy to connect up and can not connect up over long distances.
In protocol conversion scheme, transmitting device 110 receives video data using a kind of agreement, is sent out using another agreement
Send video.For example, the agreement that the reception video data of transmitting device 110 uses is procotol.The program is apparent advantage is that cloth
Line is easy, and cost is low, can be returned using low data wire, and shortcoming is that transmitting device and reception device end are intended to use network interface
Chip, network transformer, cost are high；And due to frequently carrying out protocol conversion, make realization complicated.The interface of above two scheme
Chip realizes that cost is higher by FPGA (Field-Programmable Gate Array, field programmable gate array).
Therefore, expect further improve LED display drive device, with reduce the interface chip cost of data transfer and
Wiring cost, and extend transmission distance and realize large-sized LED display.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of transmission method of video data for LED display, transmission dress
Put and drive device, wherein, by the way that partitioning video data is carried out into frequency reducing transmission into subdata, with reduce data transfer cost and
Realize and connect up over long distances.
According to the first aspect of the invention, there is provided a kind of transmission method of video data, including：Using the first clock frequency
Rate, receive the video data corresponding with image frame；By the partitioning video data into multiple subdatas, the multiple subnumber
According to the display data in a part of region for representing described image picture respectively；And second clock frequency is used, will be the multiple
At least some subdata transmitted in parallel in subdata to LED display, wherein, the second clock frequency be less than described first
Clock frequency.
Preferably, the step of segmentation includes longitudinally split described image picture to obtain the multiple subdata.
Preferably, when receiving the video data by row, including according to predetermined positional parameter the step of the segmentation
Segmenting pixels row.
Preferably, the positional parameter indicates the same position of each pixel column.
Preferably, before the step of segmentation, in addition to：The positional parameter is set.
Preferably, the step of segmentation includes described image picture being divided into multiple sprites.
Preferably, in addition to：Before the step of transmission, in addition to the multiple subdata of caching.
Preferably, when receiving the video data by row, cache according to predetermined positional parameter segmenting pixels row acquisition
Multiple subdatas.
Preferably, in addition to：In the step of receiving the video data, receive line synchronising signal, frame synchronizing signal and
At least one of horizontal blanking signal；And before the step of transmission, row is redefined according to the multiple subdata
It is at least one described in synchronizing signal, frame synchronizing signal and horizontal blanking signal.
Preferably, the second clock frequency is equal to the ratio of first clock frequency and the number of the multiple subdata
Value.
Preferably, the step of reception includes receiving the video data using the first video protocols, the transmission
Step includes sending the multiple subdata using the second video protocols.
Preferably, first video protocols and second video protocols are to be selected from HDMI agreements and DVI respectively
Any one in (Digital Visual Interface, digital visual interface) agreement.
Preferably, the video data is received using high-grade transmission line, sent using inferior grade transmission line the multiple
Subdata, the high-grade transmission line have than the higher transmission rate of inferior grade transmission line and lower transmission range.
According to the second aspect of the invention, there is provided a kind of transmitting device of video data, including：Multiple sending modules, point
Do not receive video content, the multiple sending module is by the partitioning video data into multiple subdatas, and transmitted in parallel institute
State multiple subdatas.
Preferably, the multiple sending module includes respectively：Receiving unit, for use the first clock frequency, receive with
The corresponding video data of image frame；Split positioning unit, for according to positional parameter, by partitioning video data into more height
Data, the multiple subdata represent the display data in a part of region of described image picture respectively；Buffer unit, for delaying
Deposit the multiple subdata；Transmitting element, for using second clock frequency, by least some sons in the multiple subdata
Data parallel is sent to LED display；And clock division unit, for being divided to first clock frequency, with production
The raw second clock frequency, the second clock frequency are less than first clock frequency.
Preferably, the segmentation positioning unit is used for longitudinally split described image picture to obtain the multiple subdata.
Preferably, the segmentation positioning unit is used to described image picture being divided into multiple sprites.
Preferably, when receiving the video data by row, the segmentation positioning unit segmenting pixels row.
Preferably, the positional parameter indicates the same position of each pixel column.
Preferably, in addition to parameter configuration module, for setting the positional parameter.
Preferably, when receiving the video data by row, the buffer unit splits picture according to predetermined positional parameter
Multiple subdatas that plain row obtains.
Preferably, the receiving unit receives line synchronising signal, frame synchronizing signal and row when receiving the video data
At least one of blanking signal；And the transmitting element redefines line synchronising signal, frame according to the multiple subdata
It is at least one described in synchronizing signal and horizontal blanking signal.
Preferably, the second clock frequency is equal to the ratio of first clock frequency and the number of the multiple subdata
Value.
Preferably, the receiving unit receives the video data using the first video protocols, and the transmitting element uses
Second video protocols send the multiple subdata.
Preferably, first video protocols and second video protocols are to be selected from HDMI agreements and DVI agreements respectively
In any one.
Preferably, in addition to：Impedance matching unit, including terminal resistance, the impedance matching unit is according to the transmission
The extended mode of device, input impedance is adjusted by access terminal resistance or bypass terminal resistance.
Preferably, in addition to：High-grade transmission line, it is connected with the receiving unit, for receiving the video data；
And inferior grade transmission line, it is connected with the transmitting element, for sending the multiple subdata, the high-grade transmission line
With than the higher transmission rate of inferior grade transmission line and lower transmission range.
According to the third aspect of the invention we, there is provided a kind of drive device for LED display, the LED display bag
The multiple LEDs for being arranged in array are included, the drive device includes：Above-mentioned at least one transmitting device；And multiple receptions
Device, include respectively：Receiving module, a receiving module transmitting device corresponding at least one transmitting device
It is connected, receives the corresponding subdata in the multiple subdata；And LED drive module, with the multiple LED
Corresponding LED be connected, corresponding LED is to show the one of described image picture according to a corresponding sub- data-driven
Subregion.
Preferably, at least one transmitting device includes the multiple transmitting devices being connected in parallel to each other, the multiple transmission dress
Put and produce the multiple subdata parallel.
Preferably, at least one transmitting device includes multiple transmitting devices of level each other, the multiple transmitting device
Middle prime transmitting device provides multiple intermediate data, and rear class transmitting device further splits the multiple intermediate data, so that
The multiple subdata is produced in most rear class transmitting device.
Transmitting device according to embodiments of the present invention, including two or more sending modules in parallel, so as to profit
The sprite of longitudinal interception image picture different zones is distinguished with multiple sending modules.After by frequency reducing, transmitted in parallel is given
Multiple reception devices, realize the display of complete image frame.Because transmission frequency reduces, the transmitting device allows using low
The transmission line video content of level, so as to reduce data transfer cost.The transmitting device can be extended transmission distance and improved
Transmitting efficiency, it is easy to assemble large-sized LED display.Further, the sending module in the transmitting device needs what is sent
Data volume is reduced, and under conditions of transmission frequency keeps constant, can save the transmission time of video content, is improved LED and is shown
The refresh rate of screen.
In a preferred embodiment, transmitting device receives whole video data using HDMI agreements, is sent using DVI agreements
Subdata, so as to reduce the cost of interface chip.
Drive device for LED display according to embodiments of the present invention, can not only use single transmitting device, can
So that the parallel connection of multiple transmitting devices or cascade to be extended.The extended mode can be by partitioning video data into more subnumbers
According to further extending transmission distance and improve transmitting efficiency, form larger sized LED display.
Brief description of the drawings
By referring to description of the following drawings to the embodiment of the present invention, above-mentioned and other purpose of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the schematic block diagram of the drive device of the LED display according to prior art.
Fig. 2 shows the schematic block diagram of the drive device of LED display according to a first embodiment of the present invention.
Fig. 3 shows the schematic block diagram of transmitting device in Fig. 2.
Fig. 4 shows the schematic block diagram of sending module in Fig. 3.
The expansion scheme schematic diagram in parallel and serial of transmitting device is shown respectively in Fig. 5 and 6.
Fig. 7 shows the flow chart of the transmission method of video data according to embodiments of the present invention.
Embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown some
Known part.
In this application, term " image frame " is used to represent the successive frame that LED display is shown according to video data
Complete picture, term " sprite " are used for the part picture in a part of region of image frame.LED display includes multiple cascades
Reception device, respectively display image picture sprite, complete picture so as to collectively constitute.
Fig. 2 shows the schematic block diagram of the drive device of LED display according to a first embodiment of the present invention.Drive device
200 include transmitting device 210 and multiple reception devices 220.
Transmitting device 210 receives video content from host computer with standard agreement.During operation, host computer will continuously scheme
As picture is provided in a manner of video content to transmitting device 210.Corresponding with continuous image frame, video content is, for example,
The video data of successive frame.It is corresponding with image frame that transmitting device 220 can use normal video agreement HDMI or DVI to receive
Video data, by partitioning video data into two parts subdata corresponding with the sprite of image frame, i.e. the first subnumber
According to Dout1 and the second subdata Dout2.After frequency reducing, transmitting device 210 is parallel using normal video agreement HDMI or DVI
Send the first subdata Dout1 and the second subdata Dout2.
Reception device 220 includes multiple receiving modules 131 and multiple LED drive modules 132.Multiple reception devices 220 are divided
For the first group of reception device and second group of reception device of cascade.First reception device 220 in first group of reception device from
Transmitting device 210 receives the first subdata Dout1, and the next stage being sequentially delivered in this group of reception device receives
Device 220.First reception device 220 in second group of reception device receives the second subdata Dout2 from transmitting device 210,
And it is sequentially delivered to the next stage reception device 220 in this group of reception device.
In reception device 220, each LED drive module 122 can latch relative subdata, and drive
LED is to show the subdata of correlation, so as to show a part of region of video pictures.Multiple LED of LED display 130 exist
Under the driving of multiple LED drive modules 122, complete video pictures are collectively constituted.
LED display drive device according to embodiments of the present invention, the reception device of use are same as the prior art.Under
The difference of the LED display drive device of the embodiment of the present invention is further described in text, something in common is then no longer described in detail.
In LED display drive apparatus 200, transmitting device 210 sends out into two subdatas and parallel partitioning video data
Send two subdatas, frame per second can be reduced half by the transmitting device 210, so as to using standard agreement interface chip and
Reduce data transfer cost and realize and connect up over long distances.
Fig. 3 shows the schematic block diagram of transmitting device in Fig. 2.Transmitting device 210 include sending module 211 and 212 and
Parameter configuration module 213.
Transmitting device 210 can be connected using normal video agreement HDMI or DVI with host computer.In transmitting device 210,
Sending module 211 is identical with 212 internal structure, and the two receives video content, according to intended orientation parameter by video data
It is divided into two parts subdata corresponding with the sprite of image frame (such as the sprite of left and right two), i.e. the first subnumber
According to Dout1 and the second subdata Dout2.After frequency reducing, sending module 211 and 212 is using normal video agreement HDMI or DVI
Transmitted in parallel the first subdata Dout1 and the second subdata Dout2.
Parameter configuration module 213, for being configured to positional parameter.The positional parameter is for example for image frame to be split
Into the positional parameter of two sprites in left and right.Further, it is expert in scanning display mode, the positional parameter is each pixel
Positional parameter corresponding to capable intermediate pixel.Parameter configuration module 213 is connected with sending module 211 and 212, by sending module
211 are configured to only transmission left side sprite, and sending module 212 is configured into only transmission right side sprite.
During fabrication, sending module 211 and 212 can be a complete single chip design scheme, sending module 211 with
The parallel connection of sending module 212 is realized on system board.By taking HDMI host-host protocol TYPE A ports as an example, on system board,
Receiving terminal is TPYE A interfaces, and video content differential lines and video clock differential lines are connected into sending module 211 and hair simultaneously
Send corresponding to module 212 in differential lines, other are signally attached on sending module 211.
And then the video frequency output of sending module 211 and 212 is exported with DVI host-host protocols.Thus, the He of sending module 211
Sending module 212 can be with the video content of the respective field of the rate-adaptive pacemaker of the half of incoming frequency.For example, video lattice
Formula 1360x760@60Hz, tranmitting data register frequency 85.5MHz, received by two sending modules are in parallel, a sending module sends left
Half sprite, another equipment send right half image frame, and the tranmitting data register frequency of two equipment is all set to 42.25MHz,
That is, tranmitting data register frequency is only transmission of video agreement clock frequency half, that is to say, that when tranmitting data register frequency is reduced into reception
The half of clock frequency.Thus, it is possible to send subdata using the transmission line of lower grade, and the transmission line of higher level is used to connect
Video content is received, is connected up over long distances so as to reduce data transfer cost and realize.
In the present embodiment, sending module can continue to send half image frame using HDMI agreements, then sends
Efficiency can double.
Fig. 4 shows the schematic block diagram of sending module in Fig. 3.Sending module 211 includes receiving unit 2111, segmentation positioning
Unit 2112, data buffer storage unit 2113, transmitting element 2114, impedance matching unit 2115 and clock division unit 2116.Such as
Upper described, sending module 211 has similar structure with 212, positional parameter difference is differed only in, so as to respectively by video
Data are divided into the subdata of different piece.Hereinafter only illustrated with sending module 211.
As illustrated, receiving unit 2111 uses standard agreement and receives frequency, video data Din is received from host computer.
Under line-scan mode, the video content corresponding with image frame is received by row.Receiving unit 2111 is according to video protocols solution
Analysis obtains obtains row data, generation frame synchronizing signal, line synchronising signal, horizontal blanking signal etc. successively.
Segmentation positioning unit 2112 is used to image frame is divided into sprite according to positional parameter.In this embodiment,
Image frame is divided into the subdata for representing corresponding with image frame different zones.For example, sending module 211 transmits left half son
Picture, then the starting point that the segmentation positioning unit 2112 of sending module 211 defines the row pixel of the video content of its transmission is original
Row pixel starting point, row length in pixels are the half of former row length in pixels.
In this embodiment, the preceding hemistich subdata that positioning unit 2112 is used to position each pixel column is split.Therefore, number
Whole frame data need not be cached according to buffer unit 2113, in a frame period, data buffer storage unit 2113 caches each pixel successively
Capable preceding hemistich subdata, so as to collectively constitute the left side sprite of image frame.
In this embodiment, split the longitudinal direction of positioning unit 2112 and cut image frame, i.e., by image frame be divided into it is left and
Right two sprites.For the partitioning scheme without splitting subdata after whole frame data are cached, directly caching presses the son of row segmentation
Data, so as to reduce the demand of the spatial cache of data buffer storage unit 2113.
Clock division unit 2116, for the quantity of the subdata obtained according to above-mentioned segmentation, by receiving unit 2111
Receives frequency is divided to obtain the transmission frequency of transmitting element 2114.Because the quantity of subdata is more than 1, therefore, send
Frequency is less than receives frequency.
Transmitting element 2114 obtains subdata from data buffer storage unit 2113, and uses standard agreement and transmission frequency,
Subdata is sent to reception device.The subdata includes video content and non-video content.For video content, by its whole
Lossless transport is gone out, and to non-video content, then need part to abandon.
Further, transmitting element 2114 to original frame synchronizing signal, line synchronising signal and horizontal blanking signal at
Reason, redefines frame synchronizing signal and line synchronising signal according to the subdata after segmentation, then will be sent and regarded according to video protocols
Frequency content, frame synchronizing signal, line synchronising signal and horizontal blanking signal.By taking HDMI agreements as an example, transmitting element 2114 records original
Frame synchronizing signal and line synchronising signal at the time of change, the synchronous letter of frame synchronizing signal, row is then redefined according to subdata
Number and horizontal blanking signal.
Preferably, impedance matching unit 2115 is connected on the input of receiving unit 2111.Receiving unit 2111 is via resistance
Anti- matching unit 2115 receives video data Din.Impedance matching unit 2115 includes terminal resistance, according to the transmitting device
Extended mode, pass through access terminal resistance or bypass terminal resistance adjust input impedance.LED display drive device only
When only including single transmitting device 210, impedance matching unit 2115 bypasses terminal resistance, so as to reduce data line and clock
The reception impedance of transmission line.When the drive device of LED display includes multiple transmitting devices 210 in parallel, impedance matching list
First 2115 access terminal resistance so that the reception impedance increase of data line and clock transfer line, the multiple transmitting device
210 total input impedance keeps constant.
By taking HDMI agreements as an example, the input impedance of itself of transmitting device 210 is 50 Ω, and impedance matching unit 2115 includes resistance
Resist for 50 Ω terminal resistance.When the drive device of LED display includes single transmitting device 210, impedance matching unit
2115 bypass the terminal resistance so that the reception impedance of reception device 220 is 50 Ω.Include in the drive device of LED display
During two transmitting devices 210 of parallel connection, impedance matching unit 2115 accesses the terminal resistance so that single transmitting device 210
Input impedance changes into 100 Ω from 50 Ω.Due to the parallel relationship of two transmitting devices 210, two transmitting devices 210 it is total defeated
The input impedance for entering impedance is still protected as 50 Ω.
The expansion scheme schematic diagram in parallel and serial of transmitting device is shown respectively in Fig. 5 and 6.The structure class of each transmitting device
Seemingly, as shown in Figure 3.By taking transmitting device 210 as an example, the transmitting device 210 includes sending module 211 and 212 and parameter configuration
Module 213.According to intended orientation parameter, sending module 211 and 212 is by partitioning video data into the sprite with image frame
(such as the sprite of left and right two) corresponding two parts subdata, i.e. the first subdata Dout1 and the second subdata
Dout2.After frequency reducing, using normal video agreement HDMI or DVI transmitted in parallel the first subdata Dout1 and the second subdata
Dout2。
As shown in figure 5, two transmitting devices 210 and 310 include two output ends respectively, it is connected in parallel with each other.Two biographies
Defeated device 210 and 310 receives video data Din respectively, and video data Din is divided into four subdata Dout1 to Dout4,
Image frame is corresponded respectively to according to longitudinally split a quarter sprite.It is expert in scanning display mode, transmitting device 210
In the positional parameters of two sending modules be a quarter position of each pixel column, half position respectively, transmitting device
The positional parameter of two sending modules is 3/4ths positions and the pixel pair of row end position of each pixel column respectively in 310
The positional parameter answered.
As shown in fig. 6, three transmitting devices 210 to 410 wrap includes two output ends respectively, two of transmitting device 210
Output end distinguishes connection transmission device 310 and 410, i.e. transmitting device 210 cascades with transmitting device 310 and 410 respectively.Transmission
Device 210 receives video data Din, and video data Din is divided into two intermediate data Dm1 and Dm2.Transmitting device 310 connects
Intermediate data Dm1 is received, will further be divided into two subdatas Dout1 and Dout2.Transmitting device 410 receives intermediate data
Dm2, it will further be divided into two subdatas Dout3 and Dout4.Four subdata Dout1 to Dout4 altogether, are corresponded to respectively
In image frame according to longitudinally split a quarter sprite.It is expert in scanning display mode, two hairs in transmitting device 210
The positional parameter for sending module is the positional parameter of the half position correspondence of each pixel column respectively, two in transmitting device 310
The positional parameter of individual sending module is the positional parameter of a quarter position correspondence of each pixel column respectively, transmitting device 410
In two sending modules positional parameter be respectively each pixel column 3/4ths position correspondences positional parameter.
In the embodiment, multiple transmitting devices are in parallel or cascade, so as to which pixel screen is divided into four sprites.
In multiple transmitting devices, the transmission frequency for the transmitting device being connected with reception device is all set to 21.125MHz, i.e. during transmission
Clock frequency is only transmission of video agreement clock frequency half, that is to say, that is reduced to tranmitting data register frequency and receives clock frequency
A quarter.Thus, it is possible to send subdata using the transmission line of lower grade, and use the transmission line of higher level to receive and regard
Frequency content, connected up over long distances so as to further reduce data transfer cost and realize.
In the above-described embodiment, multiple transmitting devices are in parallel or cascade, each transmitting device include two hairs in parallel
Module is sent, and so as to a quarter image frame be sent using HDMI agreements, transmitting efficiency can improve three times.For
In the embodiment in generation, the transmitting device of more quantity can be used in parallel or cascade, each transmitting device can include more
Individual sending module in parallel, so as to which image frame is divided into more sprites.Therefore, the invention is not restricted to above-mentioned implementation
Example.
The drive device of above-mentioned LED display can include at least one transmitting device, and each transmitting device includes two
Or more a sending module in parallel, so as to distinguish longitudinal interception image picture different zones using multiple sending modules
Sprite, and transmitted in parallel gives multiple reception devices, realizes the display of complete image frame.The drive device can reduce
Data transfer cost and realization connect up over long distances.Further, since the data volume that each sending module needs to send is reduced, sending
Under conditions of frequency keeps constant, the transmission time of video content can be saved, improves the refresh rate of LED display.
Fig. 7 shows the flow chart of the transmission method of video data according to embodiments of the present invention.
Based on the above-mentioned drive device for LED display, the present invention further provides the transmission method of video data.
The LED display includes being arranged in multiple LEDs of array.The drive device includes at least one transmitting device and multiple
Reception device.Each transmitting device includes multiple sending modules, receives video content respectively, the multiple sending module is by described in
Partitioning video data is into multiple subdatas, and the multiple subdata of transmitted in parallel.Each reception device includes the more of cascade
The LED drive module that individual receiving module and each receiving module are connected, the receiving module reception one in each reception device
Connected next receiving module is passed it to after individual subdata, and be connected by connected LED drive module driving
Multiple LEDs, to show a part for the subdata.
The transmission method of the video data comprises the following steps.
In step 501, using the first clock frequency, the video data corresponding with image frame is received.
In step 502, by the partitioning video data into multiple subdatas, the multiple subdata represents described respectively
The display data in a part of region of image frame.Video content is sent by frame in video and audio host-host protocol, and image is drawn
Face is sent by row.Often row sends the time to standard agreement regulation, sends number of pixels and horizontal blanking signal.It is each under in parallel
Sending module can need the image-region transmitted with separate configurations, can also pass through each hair of parameter configuration module configuration of outside
Send the sending zone of module.Generally, it is that piece image is drawn after the transmission image synthesis of the sending module under all parallel connections
Face.In this step, according to configuration, the zone location of image frame comes out each sending module corresponding to itself, and intercepts and refer to
Determine the image frame in region.
In step 503, using second clock frequency, at least some subdatas in the multiple subdata are sent out parallel
Deliver to LED display.In this step, for example, single transmitting device receives video data using receives frequency, using transmission frequency
Rate sends subdata.Because single transmitting device includes multiple sending module transmitted in parallel subdatas, therefore, the transmission frequency can
With less than receives frequency.
In the case of video data is received by row, multiple sending modules of single transmitting device only need respectively caching and
A part of data (i.e. subdata) of current pixel column are sent, therefore, the pixel data for needing to transmit in the time of being expert at is reduced,
Transmission rate can be reduced.But transmission rate is reduced, it can equally reduce the transmission of the packet (if there is) of horizontal blanking signal
Quantity.Transmission for the packet of horizontal blanking signal, it can be realized using following two modes.A kind of is exactly to abandon row completely
The packet of blanking signal, redefine new packet.The packet redefined comprise at least for image transmitting must
Signal, such as frame synchronization are wanted, row is synchronously.So, relative to former frame synchronizing signal, line synchronising signal, the new frame synchronization of transmission
Signal, some deformations of line synchronising signal, but the relativeness of frame synchronizing signal and line synchronising signal can be ensured.This method energy
Simplify design, simplify configuration.Another is that legacy data bag remains untouched to transfer out, and this is just needed by calculating row picture
Plain number and horizontal blanking clock cycle, transmission clock frequency is set.In embodiments of the present invention, in transmitting device, Duo Gefa
Send wired in parallel, frequency reducing respectively sends a part for video data, so as to inferior grade transmission line video data, by
This reduces the cost of transmission line, and each sending module only sends a part of video data, so that under conditions of frequency reducing,
The total transmission rate of video data keeps constant, and therefore, the performance parameter of LED display is unaffected.
Although the embodiment of the present invention is disclosed as above with preferred embodiment, its be not for limiting claim, it is any
Those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and modification, therefore this
The protection domain of invention should be defined by the scope that the claims in the present invention are defined.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included in the scope of the protection.
Claims (30)
1. a kind of transmission method of video data, including：
Using the first clock frequency, the video data corresponding with image frame is received；
The partitioning video data is represented into a part for described image picture respectively into multiple subdatas, the multiple subdata
The display data in region；And
Using second clock frequency, by least some subdata transmitted in parallel in the multiple subdata to LED display,
Wherein, the second clock frequency is less than first clock frequency.
2. transmission method according to claim 1, wherein, include longitudinally split described image picture the step of the segmentation
To obtain the multiple subdata.
3. transmission method according to claim 2, wherein, when receiving the video data by row, the step of the segmentation
It is rapid to include according to predetermined positional parameter segmenting pixels row.
4. transmission method according to claim 3, wherein, the positional parameter indicates the same position of each pixel column.
5. transmission method according to claim 3, before the step of segmentation, in addition to：The positioning ginseng is set
Number.
6. transmission method according to claim 1, wherein, include described image picture being divided into the step of the segmentation
Multiple sprites.
7. transmission method according to claim 1, in addition to：Before the step of transmission, in addition to described in caching
Multiple subdatas.
8. transmission method according to claim 7, wherein, when receiving the video data by row, cache according to predetermined
Positional parameter segmenting pixels row obtain multiple subdatas.
9. transmission method according to claim 1, in addition to：
In the step of receiving the video data, receive in line synchronising signal, frame synchronizing signal and horizontal blanking signal at least
One of；And
Before the step of transmission, line synchronising signal, frame synchronizing signal and row are redefined according to the multiple subdata
It is at least one described in blanking signal.
10. transmission method according to claim 1, wherein, the second clock frequency is equal to first clock frequency
With the ratio of the number of the multiple subdata.
11. transmission method according to claim 1, wherein, include connecing using the first video protocols the step of the reception
Receive the video data, include sending the multiple subdata using the second video protocols the step of the transmission.
12. transmission method according to claim 11, wherein, first video protocols and second video protocols point
It is not any one in HDMI agreements and DVI agreements.
13. transmission method according to claim 1, wherein, the video data is received using high-grade transmission line, used
Inferior grade transmission line sends the multiple subdata, and the high-grade transmission line has the biography higher than the inferior grade transmission line
Defeated speed and lower transmission range.
14. a kind of transmitting device of video data, including：
Multiple sending modules, receive video content respectively, and the multiple sending module is by the partitioning video data into more height
Data, and the multiple subdata of transmitted in parallel.
15. transmitting device according to claim 14, wherein, the multiple sending module includes respectively：
Receiving unit, for using the first clock frequency, receive the video data corresponding with image frame；
Split positioning unit, for according to positional parameter, partitioning video data to be divided into multiple subdatas, the multiple subdata
Not Biao Shi described image picture a part of region display data；
Buffer unit, for caching the multiple subdata；
Transmitting element, for using second clock frequency, by least some subdata transmitted in parallel in the multiple subdata
To LED display；And
Clock division unit, for being divided to first clock frequency, to produce the second clock frequency, described
Two clock frequencies are less than first clock frequency.
16. transmitting device according to claim 15, wherein, the segmentation positioning unit is used for longitudinally split described image
Picture is to obtain the multiple subdata.
17. transmitting device according to claim 15, wherein, the segmentation positioning unit is used for described image picture is equal
It is divided into multiple sprites.
18. transmitting device according to claim 16, wherein, when receiving the video data by row, the segmentation is fixed
Bit location segmenting pixels row.
19. transmitting device according to claim 18, wherein, the positional parameter indicates the identical bits of each pixel column
Put.
20. transmitting device according to claim 15, in addition to parameter configuration module, for setting the positional parameter.
21. transmitting device according to claim 15, wherein, when receiving the video data by row, the caching is single
Multiple subdatas that member caching obtains according to predetermined positional parameter segmenting pixels row.
22. transmitting device according to claim 15, wherein, the receiving unit connects when receiving the video data
Receive at least one of line synchronising signal, frame synchronizing signal and horizontal blanking signal；And
The transmitting element is redefined in line synchronising signal, frame synchronizing signal and horizontal blanking signal according to the multiple subdata
It is at least one described.
23. transmitting device according to claim 15, wherein, the second clock frequency is equal to first clock frequency
With the ratio of the number of the multiple subdata.
24. transmitting device according to claim 15, wherein, the receiving unit is using described in the reception of the first video protocols
Video data, the transmitting element send the multiple subdata using the second video protocols.
25. transmitting device according to claim 24, wherein, first video protocols and second video protocols point
It is not any one in HDMI agreements and DVI agreements.
26. transmitting device according to claim 15, in addition to：
Impedance matching unit, including terminal resistance, the impedance matching unit pass through according to the extended mode of the transmitting device
Access terminal resistance or bypass terminal resistance regulation input impedance.
27. transmitting device according to claim 15, in addition to：
High-grade transmission line, it is connected with the receiving unit, for receiving the video data；And
Inferior grade transmission line, it is connected with the transmitting element, for sending the multiple subdata,
The high-grade transmission line has than the higher transmission rate of inferior grade transmission line and lower transmission range.
28. a kind of drive device for LED display, the LED display includes being arranged in multiple LEDs of array, institute
Stating drive device includes：
At least one transmitting device according to any one of claim 14 to 27；And
Multiple reception devices, include respectively：
Receiving module, a receiving module transmitting device corresponding at least one transmitting device are connected, connect
Receive the corresponding subdata in the multiple subdata；And
LED drive module, LED corresponding to the multiple LED are connected, according to a corresponding sub- data-driven
Corresponding LED is to show a part of region of described image picture.
29. drive device according to claim 28, wherein, at least one transmitting device is more including being connected in parallel to each other
Individual transmitting device, the multiple transmitting device produce the multiple subdata parallel.
30. drive device according to claim 28, wherein, at least one transmitting device is multiple including level each other
Transmitting device, prime transmitting device provides multiple intermediate data in the multiple transmitting device, and rear class transmitting device further divides
The multiple intermediate data is cut, so as to produce the multiple subdata in most rear class transmitting device.
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