CN102890909A - Synchronous displaying method and device - Google Patents
Synchronous displaying method and device Download PDFInfo
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- CN102890909A CN102890909A CN2012103615935A CN201210361593A CN102890909A CN 102890909 A CN102890909 A CN 102890909A CN 2012103615935 A CN2012103615935 A CN 2012103615935A CN 201210361593 A CN201210361593 A CN 201210361593A CN 102890909 A CN102890909 A CN 102890909A
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Abstract
The invention provides a synchronous displaying method and a device. The method comprises the following steps that a first display data controller receives data stream and transmits the received data stream to a first display time sequence controller, the first display time sequence controller outputs the data stream to a first display screen according to a display time sequence, the first display time sequence controller also outputs the data stream which is outputted to a first display device to a data multiplexing controller, the data multiplexing controller is used for zooming the data in the received data stream and outputs the data to a second display time sequence controller, the data multiplexing controller calculates a frequency for outputting the data stream from the second display time sequence controller to a second display screen according to a frame time sequence periodicity of the first display screen and a frame time sequence periodicity of the second display screen, and the second display time sequence controller outputs the data stream to the second display screen through the calculated frequency. The device utilizes the said method to output data to the two display screens. Due to adopting the method and the device, the bandwidth resource occupied by a synchronous display device can be reduced, and the production cost can be reduced.
Description
Technical field
The present invention relates to the multi-medium data process field, particularly, is a kind of synchronous display method of the video data to multi-display and the device of simultaneous display.
Background technology
The existing hand-hold electronic equipments that much has Presentation Function, such as MP4, PDA or learning machine etc., except can be on the display screen of self display video or the image, display screen that can also external other electronic equipments, as being connected with the display of televisor, computer, projector etc., to external display device output video or image.Because external display area is larger, has better display effect, convenient many people watch shown video or image simultaneously.In addition, more existing electronic equipments also can drive a plurality of different display screen display videos or image etc. simultaneously.
Equipment is connected with a plurality of display screens and to a plurality of display screens output data, is called simultaneous display, be called for short with aobvious, and the content that each display screen shows is identical, is called homology with aobvious.Certainly, under the same aobvious technology of homology, different display screens are of different sizes usually, and the resolution of display screen also is not quite similar, but this does not affect homology with aobvious technology realization.
When using the same aobvious technology of homology, synchronous display apparatus need to be set in electronic equipment, existing synchronous display apparatus as shown in Figure 1.Synchronous display apparatus has two groups of display modules, first group of display module comprises demonstration recording controller 10, display timing generator controller 11, display screen 12 and clock-signal generator 13, second group of display module comprises demonstration recording controller 20, display timing generator controller 21, display screen 22 and clock-signal generator 23, the display screen that carries for electronic equipment of display screen 12 wherein, display screen 22 are the display screen of external electronic equipment.
Show the data stream that recording controller 10 reads needs demonstration from storer 1, the data stream that reads is for process is filtered, decoded data, after showing recording controller 10 reading data flows, export the data that read to display timing generator controller 11, display timing generator controller 11 is according to the resolution sizes of display screen 12 and the characteristic of display screen 12, add the blanking data, export chronologically display screen 12 to.
Clock-signal generator 13 is used for guaranteeing the clock signal synchronization of display timing generator controller 11 and display screen 12 to display timing generator controller 11 and display screen 12 clock signals.
If display screen 12 is LCD display, display timing generator controller 11 comprises valid data and blanking data to the data that display screen 12 sends.Blanking data and valid data are characteristics of LCD display sequential, the width of valid data and the height of valid data refer to height and the width that display screen 12 needs show, these data are from storer 1 acquisition of reading, and show that therefore the data volume that recording controller 10 reads determines the time span that valid data transmit.The height of the width of blanking data and blanking data is then irrelevant with demonstration, but its data represent valid data transmission length of front free time.Blanking data or blanking time generally are used for the preliminary work before data transmit, and it occupies the part of LCD display sequential.In addition, the blanking data are virtual datas, and it is not used as demonstration.
Shown in Fig. 2 (a), display timing generator controller 11 is 480 pixels to the width of the valid data of display screen 12 transmission, the height of valid data is 272 pixels, the width of blanking data is 20 pixels, the height of blanking data is 10 pixels, therefore, display timing generator controller 11 is (480+20) * (272+10) to the data length that display screen 12 sends, namely need clock period of 500 * 282 display timing generators to finish the transmission of a picture data, therefore, the frame sequential periodicity of display screen 21 is 500 * 282, therefore, frame sequential periodicity as referred to herein is display screen (line numbers of the line number of valid data+blanking data) * (in the data line in the clock periodicity+data line of valid data the clock periodicity of blanking data).
Show that recording controller 20 also is reading data flow from storer 1, and export the data stream that reads to display timing generator controller 21, clock-signal generator 23 is guaranteed the clock signal synchronization of display timing generator controller 21 and display screen 22 to display timing generator controller 21, display screen 22 clock signals.
With display screen 12 in the same manner, display screen 22 also is LCD display, display timing generator controller 21 also comprises the blanking data to the data that display screen 22 sends, shown in Fig. 2 (b), display timing generator controller 21 is 320 pixels to the width of the valid data of display screen 22 transmission, the height of valid data is 240 pixels, the width of blanking data is 16 pixels, the height of blanking data is 8 pixels, therefore, display timing generator controller 21 is (320+16) * (240+8) to the data length that display screen 22 sends, and namely needs clock period of 336 * 248 display timing generators to finish the transmission of a picture data, therefore, the frame sequential periodicity of display screen 22 is 336 * 248.
As seen, in the existing synchronous display apparatus, two demonstration recording controllers 10,20 all need reading data flow from storer 1, i.e. two groups of display modules reference-to storage 1 repeatedly, the bandwidth that causes synchronous display apparatus to take is larger, and the resource that takies is larger, and the power consumption of synchronous display apparatus is larger simultaneously, to having relatively high expectations of electronic equipment, and then cause the production cost of electronic equipment higher.
Summary of the invention
Fundamental purpose of the present invention provides the less synchronous display method of a kind of occupied bandwidth resource.
Another object of the present invention provides a kind of and synchronous display apparatus that power consumption little few to the electronic equipment resource occupation.
In order to realize above-mentioned fundamental purpose, synchronous display method provided by the invention comprises that first shows the recording controller receiving data stream, and with data stream transmitting to the first display timing generator controller that receives, the first display timing generator controller exports data stream to first display screen by display timing generator, and, the data stream that the first display timing generator controller also will export the first display to exports the data-reusing controller to, the data-reusing controller carries out convergent-divergent to the data in the data stream that receives and processes and export to the second display timing generator controller, the data-reusing controller also calculates the second display timing generator controller to the frequency of second display screen output stream according to the frame sequential periodicity of the first display screen and the frame sequential periodicity of second display screen, the second display timing generator controller with the frequency that calculates to the second display screen output stream.
By such scheme as seen, the second display timing generator controller is not by showing recording controller reading data flow from storer, but from the second display timing generator controller, obtain data stream by the data-reusing controller, only have like this first to show that recording controller obtains data stream from storer, the shared bandwidth of synchronous display apparatus is less, power consumption is also less, is conducive to reduce the production cost of electronic equipment.
A preferred scheme is, before the first display timing generator controller is sent to the data-reusing controller with data stream, to the data point of addition information that sends.
This shows, the packet that the data-reusing controller receives contains positional information, is convenient to the data-reusing controller start-stop position of every data line is identified, and conveniently data is carried out convergent-divergent and processes.
Further scheme is, data stream after the data-reusing controller is processed convergent-divergent is temporarily stored in the data buffer, to the second display timing generator controller output stream, and the data volume of the data-reusing controller data stream of keep in according to data buffer is regulated the frequency of being scheduled to data buffer with predetermined frequency.
As seen, the data-reusing controller can be regulated the frequency of data buffer output data neatly, be conducive to data buffer and export neatly data, the frequency of avoiding exporting data is too fixed and the difficulty of increase data output, reduce the realization difficulty of synchronous display apparatus, and can guarantee that two display screens show the synchronism of data.
For realizing another above-mentioned purpose, synchronous display apparatus provided by the invention has first and shows recording controller, be used for the first display timing generator controller that reception first shows the data stream of recording controller output, be used for receiving and showing the first display screen of the data stream of the first display timing generator controller output, the second display timing generator controller, be used for receiving and showing the second display screen of the data stream of the second display timing generator controller output, also comprise the data-reusing controller, be used for receiving the data stream of the first display timing generator controller output, and the data of the data stream that receives are carried out exporting the second display timing generator controller to after convergent-divergent is processed, the data-reusing controller also calculates the second display timing generator controller to the frequency of second display screen output stream according to the frame sequential periodicity of the first display screen and the frame sequential periodicity of second display screen, the second display timing generator controller with this frequency to the second display screen output stream.
By such scheme as seen, synchronous display apparatus does not arrange two demonstration recording controllers, the second display timing generator controller reading out data from the data-reusing controller, avoid so simultaneously reading data flow from storer of two demonstration recording controllers, the shared bandwidth of synchronous display apparatus is less, power consumption is also little, is conducive to reduce the production cost of electronic equipment.
A preferred scheme is that setting position information adding device in the first display timing generator controller is used for to the data point of addition information that exports the data-reusing controller to.
This shows, the packet that the data-reusing controller receives contains positional information, is conducive to the start-stop position that the data-reusing controller is differentiated every data line, makes things convenient for it to realize the convergent-divergent of data is processed.
Further scheme is, be provided with data buffer and frequency modulation control device in the data-reusing controller, data buffer is used for temporary through the data after the convergent-divergent processing, and the frequency modulation control device is used for the computational data impact damper to the frequency of the second display timing generator controller output stream.
As seen, the frequency that data buffer calculates according to the frequency modulation control device guarantees that to the second time schedule controller output stream two display screens synchronously show data, and the inconsistent situation of the picture of avoiding two display screens to show occurs.
Description of drawings
Fig. 1 is the structured flowchart of existing synchronous display apparatus.
Fig. 2 is the valid data of two display screen transmission in Fig. 1 and the schematic diagram of blanking data.
Fig. 3 is the structured flowchart of synchronous display apparatus embodiment of the present invention.
Fig. 4 is the structured flowchart of data-reusing controller among the synchronous display apparatus embodiment of the present invention.
Fig. 5 is the process flow diagram of synchronous display method embodiment of the present invention.
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
Synchronous display apparatus of the present invention is applied on the hand-hold electronic equipments such as MP4, PDA, and preferably, this hand-hold electronic equipments is with the display screen of self, and can be connected with the display device of outside, to the display device output data of outside.Certainly, this hand-hold electronic equipments also can not with the display screen of self, directly be exported data to two or more external display device.
Referring to Fig. 3, synchronous display apparatus of the present invention has the recording controller 30 of demonstration, display timing generator controller 31, display screen 32, clock-signal generator 33, data-reusing controller 40, display timing generator controller 51, display screen 52 and clock-signal generator 53.
Show recording controller 30 from storer 2 reading data flows, the data stream that reads is through filtration, decoded data stream, and exports the data stream that reads to display timing generator controller 31.Display timing generator controller 31 interior setting position information adding devices 35 are used for the data point of addition information to the data stream that receives.Positional information can be to be added on the every data line foremost that shows data, namely before first data of every data line, add a mark as start mark, or at mark of interpolation backmost of every data line as end mark, mark like this start-stop position of every data line.
Every data line is the data that comprise blanking data and valid data, and shown in Fig. 2 (a), data line is the data that comprise 500 pixels, the data that need to transmit with the clock period of 500 display timing generators.
Clock-signal generator 33 clockings, and to display timing generator controller 31 and display screen 32 clock signal synchronously, with the clock signal synchronization of guaranteeing that display timing generator controller 31 and display screen 32 receive.
Display timing generator controller 31 also exports data stream to display screen 32 chronologically, and display screen 32 changes into corresponding image with the data stream that receives and shows.
The data stream that display timing generator controller 31 also will be sent to display screen 32 is sent to data-reusing controller 40, and preferably, display timing generator controller 31 synchronously is sent to data stream display screen 32 and data-reusing controller 40.Data in the data stream of 40 pairs of receptions of data-reusing controller are carried out the convergent-divergent processing, and the data after then convergent-divergent being processed export display timing generator controller 51 to.
Referring to Fig. 4, the data-reusing controller has image scaling unit 41, data buffer 42 and frequency modulation control device 43.Image scaling unit 41 receives the data stream from display timing generator controller 31, and the data in the data stream are carried out convergent-divergent filtering, obtains the data behind the convergent-divergent.For example, the data of Fig. 2 (a) are the data that display screen 32 receives, the data that Fig. 2 (b) receives for display screen 52, then valid data width and the length of display screen 32 receptions are respectively 480 pixels, 272 pixels, the width of blanking data, length are respectively 20 pixels, 10 pixels, valid data width and length that display screen 52 receives are respectively 320 pixels, 240 pixels, and the width of blanking data, length are respectively 16 pixels, 8 pixels.
The data of 41 pairs of 500 pixels from display timing generator controller 31 in image scaling unit * 282 pixels resample, because the frame sequential periodicity of display screen 52 is (320+16) * (240+8), need through convergent-divergent filtering after then resampling, obtain the new demonstration data of 336 pixels * 248 pixels.The data that display screen 52 receives are exactly above-mentioned through resampling and the filtered data of convergent-divergent, because the data that display screen 52 receives are by the data zooming filtering from display timing generator controller 31 is come, therefore the shown image of the shown image of display screen 52 and display screen 32 is identical, is that size is different.
Because the data that image scaling unit 41 receives are with positional information, it can tell the start-stop position of the shown every data line of data of display screen 32, therefore can carry out convergent-divergent to every data line exactly and process, also can carry out convergent-divergent to each column data and process.
Image scaling unit 41 is not directly to export the data behind the convergent-divergent to display timing generator controller 51, but the data behind the convergent-divergent are temporarily stored in the data buffer 42, exports data stream to display timing generator controller 51 by data buffer 42.
Because the image resolution ratio that display screen 32 shows is not identical with the resolution of display screen 52 shown images, therefore display timing generator controller 31 is not identical to the frequency of display screen 52 output data with display timing generator controller 51 to the frequency of display screen 32 output data, therefore, if the data of impact damper are directly exported to the frequency of display screen 32 output data according to display timing generator controller 31, with or cause the nonsynchronous problem of image of image that display screen 32 shows and display screen 52 demonstrations, thereby need to regulate to the frequency of display screen 52 output data display timing generator controller 51, this can be by regulating data buffer 42 to the simultaneous display of frequency realization display screen 32 with the display screen 52 of display timing generator controller 51 output data.
The data-reusing controller 40 interior frequency modulation control devices 43 that arrange are used for computational data impact damper 42 to the clock frequency of display timing generator controller 51 output data.Suppose that display timing generator controller 31 is 100MHz to the clock frequency f1 of the data of display screen 32 transmission, for the image synchronization that guarantees that image that display screen 52 shows and display screen 32 show, display timing generator controller 51 should be set as to the data clock frequency f 2 that display screen 52 transmits:
As seen, to be the frame sequential periodicity of frame sequential periodicity, display screen 52 according to display screen 32 and display timing generator controller 31 calculate display timing generator controller 51 to the data clock frequency f 2 of display screen 52 transmission to the clock frequency f1 of the data of display screen 32 transmission with frequency modulation control device 43.Therefore, data-reusing controller 40 needs the clock signal of receive clock signal generator 33 outputs, with the clock signal that guarantees data-reusing controller 40 correct receive clock signal generators 33 and the frequency of judging this clock signal.
Data buffer 42 exports display timing generator controller 51 to the above-mentioned frequency f of calculating 2 data stream that it is temporary, display timing generator controller 51 also be with frequency f 2 to display screen 52 output streams, can guarantee like this image synchronization of image that display screen 32 shows and display screen 52 demonstrations.
Certainly, clock-signal generator 53 clockings, and to display timing generator controller 51 and display screen 52 clock signals, be used for guaranteeing the clock signal synchronization of display timing generator controller 51 and display screen 52.Simultaneously, clock-signal generator 53 is gone back the order of receive data multiplex controller 40, synchronously regulates the frequency of clock signal.
But the frequency f 2 of above-mentioned calculating is a frequency that is difficult to obtain, and therefore can only use akin frequency to substitute.If set frequency that certain approaches, use such as 170MHz alternative frequency f2, then it is greater than real required frequency f 2, will cause the shown data of display screen 52 too fast and can't show at sometime image.If set the frequency that another approaches, such as 169MHz alternative frequency f2, then because it less than true required frequency f 2, will cause display screen 52 can't in time show data.In order to address this problem, the present invention adopts and dynamically regulates data buffer 42 sends mode from the frequency of data stream to display timing generator controller 51, in time finely tune data buffer 42 sends clock frequency from data stream to display timing generator controller 51 by frequency modulation control device 43, make the average clock frequency of display screen 52 receive datas reach f2.
Because the frequency f 2 of display timing generator controller 51 to the frequency of display screen 52 output streams and data buffer 42 to display timing generator controller 51 output streams is consistent, so frequency modulation control device 43 adjusting data buffers 42 have also just been regulated the frequency of display timing generator controller 51 to display screen 52 output streams to the frequency f 2 of display timing generator controller 51 output streams.
In the present embodiment, for guaranteeing that the data that data buffer 42 is kept in are in half-full state, it also is safest state, need to set two threshold values, the upper limit threshold MT of a safe storage, the lower threshold LT of another safe storage, the state of the data volume that data buffer 42 is kept between upper limit threshold MT and lower threshold LT is safe condition, this moment, data buffer 42 was operated in non-frequency modulation state, with standard frequency, such as the 169.2MHz output stream.If the temporary data volume of data buffer 42 is during less than lower threshold LT, data buffer is operated in the low frequency state, to be lower than the Frequency LF of standard frequency, such as the 169MHz output stream.If the temporary data volume of data buffer 42 is during greater than upper limit threshold MT, data buffer 42 is operated in the high frequency state, to be higher than the high frequency frequency HF of standard frequency, such as the 170MHz output stream.
Therefore, behind the frame sequential periodicity calculated rate f2 of frequency modulation control device 43 according to display screen 32 and display screen 52, to set three frequencies, be standard frequency, high frequency frequency and Frequency, decide according to the temporary data volumes of data buffer 42 and to use which frequency, namely data buffer 42 with what kind of frequency to display timing generator controller 51 output streams.
Process by above-mentioned frequency modulation, the temporary amount of data that can guarantee data buffer 42 often is in or near half-full state.Certainly, the frequency modulation order will be passed through low-pass filtering treatment, prevents too frequently frequency modulation.For guaranteeing the safety of frequency modulation, the frequency of the clock signal of clock-signal generator 53 outputs only can default, near the up and down by a small margin fluctuation of value of frequency f 2.
Data buffer 42 according to its temporary data volume with the frequency of different settings to display timing generator controller 51 output streams, display timing generator controller 51 to display screen 52 output streams, converts data stream to video, image output with this frequency chronologically behind display screen 52 receiving data streams.
The workflow of synchronous display apparatus is described below in conjunction with Fig. 5.At first, synchronous display apparatus execution in step S1 shows recording controller 30 reading data flow from storer 2, and exports the data stream that reads to display timing generator controller 31.Then, execution in step S2, display timing generator controller 31 are to display screen 32 output streams, and simultaneously, display timing generator controller 31 is also to data-reusing controller 40 output streams.Certainly, before display timing generator controller 31 output streams, should be to point of addition information in the data of data stream, such as the start mark of data line or end mark etc.
Then, data-reusing controller 40 execution in step S3 carry out convergent-divergent filtering by the 41 pairs of data in image scaling unit, and are temporarily stored in the data buffer 42.Then, frequency modulation control device 43 execution in step S4 are according to the frame sequential periodicity of display screen 32, the frame sequential periodicity of display screen 52 and display timing generator controller 31 is exported data to frequency from display timing generator controller 51 to the frequency computation part data buffer 42 of display screen 32 output streams.Certainly, in the situation that the frequency of calculating is difficult to realize, should be according to the frequency setting standard frequency of calculating, high frequency frequency and Frequency.
Then, data-reusing controller 40 execution in step S5 judge whether the data volume that data buffer 42 is kept in is higher than upper limit threshold, execution in step S6 in this way, and the frequency of setting data impact damper 42 output streams is the high frequency frequency, namely preset frequency is the high frequency frequency.The data volumes of keeping in such as data impact damper 42 are not to be higher than upper limit threshold, then continue execution in step S7, judge whether its temporary data volume is lower than lower threshold, in this way execution in step S8, the frequency of setting data impact damper 42 output streams is Frequency, and namely preset frequency is Frequency.Neither be higher than upper limit threshold if judge the data volume that data buffer 42 is kept in, also be not less than lower threshold, execution in step S9 then, the frequency of setting data impact damper 42 output streams is standard frequency, namely preset frequency is standard frequency.
At last, data-reusing controller 40 execution in step S10, data buffer 42 with preset frequency to display timing generator controller 51 output streams, display timing generator controller 51 also with preset frequency to display screen 52 output streams.Display screen 32, display screen 52 receive respectively and show the data stream that receives.
Certainly, synchronous display apparatus judges also whether storer 2 also has the data stream that needs demonstration, and namely execution in step S11 has such as judgement, returns execution in step S1, does not have the flow process of deactivating if judge.
By above-mentioned scheme as seen, synchronous display apparatus does not need to use two demonstration recording controllers reading data flow from storer, reduces the bandwidth that takies electronic equipment, reduces the power consumption of synchronous display apparatus yet, thereby reduces the production cost of electronic equipment.
Certainly, above-described embodiment only is the better embodiment of the present invention, during practical application, more change can also be arranged, for example, be a frequency that can easily realize at the computational data impact damper to the frequency of second display timing generator controller output stream, then need not established standards frequency, high frequency frequency or Frequency, directly get final product with this frequency output stream of easily realizing; Perhaps, first display timing generator controller is to the data point of addition information of data stream, but the start-stop position of calculating voluntarily every data line according to the clock periodicity sum of the clock periodicity of the capable valid data of first display screen and horizontal blanking data by the image scaling unit; Or when needs were exported data to more display screen, the data-reusing controller can be to more display timing generator controller output stream, and such change also can realize purpose of the present invention.
It is emphasized that at last to the invention is not restricted to above-mentioned embodiment, also should be included in the protection domain of claim of the present invention such as the change of display resolution, the variations such as change of data buffer output data frequency.
Claims (10)
1. synchronous display method comprises
First shows the recording controller receiving data stream, and with data stream transmitting to the first display timing generator controller that receives, described the first display timing generator controller exports described data stream to first display screen by display timing generator;
It is characterized in that:
The data stream that described the first display timing generator controller also will export described the first display to exports the data-reusing controller to, described data-reusing controller carries out convergent-divergent to the data in the data stream that receives and processes and export to the second display timing generator controller, described data-reusing controller also calculates described the second display timing generator controller to the frequency of described second display screen output stream according to the frame sequential periodicity of the first display screen and the frame sequential periodicity of second display screen, described the second display timing generator controller with described frequency to described second display screen output stream.
2. synchronous display method according to claim 1 is characterized in that:
Before described the first display timing generator controller is sent to described data-reusing controller with data stream, to the data point of addition information that sends.
3. synchronous display method according to claim 2 is characterized in that:
Described positional information is the start mark of row data or the end mark of row data.
4. according to claim 1 to 3 each described synchronous display methods, it is characterized in that:
Data stream after described data-reusing controller is processed convergent-divergent is temporarily stored in the data buffer, described data buffer with predetermined frequency to described the second display timing generator controller output stream.
5. synchronous display method according to claim 4 is characterized in that:
Described data-reusing controller is regulated described predetermined frequency according to the data volume of the data stream that described data buffer is kept in.
6. synchronous display method according to claim 5 is characterized in that:
The step of regulating described predetermined frequency is:
When described data-reusing controller judged that the temporary data volume of described data buffer is between the upper limit threshold of storing and lower threshold, setting described predetermined frequency was standard frequency;
When described data-reusing controller was judged the temporary data volume of described data buffer greater than described upper limit threshold, setting described predetermined frequency was the high frequency frequency that is higher than described standard frequency;
When described data-reusing controller was judged the temporary data volume of described data buffer less than described lower threshold, setting described predetermined frequency was the Frequency that is lower than described standard frequency.
7. synchronous display apparatus comprises
First shows recording controller, is used for receiving data stream;
The first display timing generator controller is used for receiving described first and shows the data stream that recording controller is exported;
The first display screen is used for receiving and showing the data stream that described the first display timing generator controller is exported;
The second display timing generator controller is used for receiving data stream;
Second display screen is used for receiving and showing the data stream that described the second display timing generator controller is exported;
It is characterized in that:
The data-reusing controller, be used for receiving the data stream of described the first display timing generator controller output, and the data of the data stream that receives are carried out exporting described the second display timing generator controller to after convergent-divergent is processed, described data-reusing controller also calculates described the second display timing generator controller to the frequency of described second display screen output stream according to the frame sequential periodicity of described the first display screen and the frame sequential periodicity of described second display screen;
Described the second display timing generator controller with described frequency to the second display screen output stream.
8. synchronous display apparatus according to claim 7 is characterized in that:
Setting position information adding device in described the first display timing generator controller is used for to the data point of addition information that exports described data-reusing controller to.
9. synchronous display apparatus according to claim 8 is characterized in that:
Described positional information is the start mark of row data or the end mark of row data.
10. according to claim 7 to 9 each described synchronous display apparatus, it is characterized in that:
Be provided with data buffer and frequency modulation control device in the described data-reusing controller, described data buffer is used for temporary through the data after the convergent-divergent processing, and described frequency modulation control device is used for calculating described data buffer to the frequency of described the second display timing generator controller output stream.
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| CN102890909B (en) | 2015-07-08 |
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