CN104980666B - Video switcher and switching method thereof - Google Patents
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Abstract
The invention discloses an image switcher, which comprises a control unit and a display information switching module; and a switching method, wherein the Display information switching module switches and controls through the control unit to shorten the time that the picture does not show when the Extended Display Identification Data (EDID) of the screen is updated.
Description
Technical field
The present invention is related to a kind of video switch, and espespecially a kind of extension display capabilities in renewal display device identify number
During according to (Extended Display Identification Data, EDID), shorten the image switching that image does not go out the picture time
Device and its switching method.
Background technology
In traditional Image sources, such as：Computer, DVD player or blue-ray DVD player etc., and video and audio output device,
Such as：, can in order to allow Image sources to export video and audio output device in the framework of the combination of display or display and loudspeaker
With support display picture data, it is however generally that, Image sources via DDC (Display Data Channel,
DDC) the EDID of inquiry display so that Image sources can learn the basic parameter of video and audio output device, such as：Manufactory
Business and support resolution of screen etc., and then image information corresponding with video and audio output device can be exported, show in display device
Show the best in quality of image.
Due to showing the demand diversification in market, such as：Stage performance, sportscast or control centre and any system need
Want instant video to switch or video wall combination, in the conventional technology a kind of video switch of matrix form provide more display sources with
The switching interface of multi-display apparatus, to provide solution using situation demand in response to different.The shadow of so-called matrix form
As switch, it, which has, couples multiple audio-visual input sources and the multiple video and audio output devices of coupling.Pass through switching control, Ke Yirang
Multiple audio-visual input sources export respectively to be exported to multiple audio-visual defeated to multiple video and audio output devices, or single audio-visual input source
Go out device, and produce the display effect that segmentation replicates picture (splitter) or video wall (video wall).
In multiple audio-visual input sources, the video switch of matrix form and the combo architectures of multiple video and audio output devices, often
One audio-visual input source equally obtains the EDID of video and audio output device via the video switch, when audio-visual input source is exporting
After audio-visual or image information, when updating EDID if necessary, such as：When changing video and audio output device, or in particular case
Under, change when audio-visual or image parameter is exported using the EDID of the video switch internal preset as audio-visual input source, can be because
The situation that EDID produces of short duration no picture is updated for audio-visual input source.
Fig. 1 be refer to Fig. 3, wherein, Fig. 1 is traditional video switch configuration diagram, and Fig. 2 to Fig. 3 is traditional shadow
Schematic diagram during EDID is updated as switch.As shown in figure 1, the input port coupling image input source of video switch, each
The corresponding EDID memories of individual input source, such as：EEPROM, and the output port of video switch is coupled with video and audio output device
D1 and D2, wherein video and audio output device D1 and D2 have respective EDID respectively.For example, in one case, as Fig. 1 with
Shown in Fig. 2, when user will update what is stored in original EDID memories using the default EDID inside video switch
During EDID information, control unit (Micro Control Unit, MCU) can control a hot plug to detect (Hot Plug
Detection, HPD) pin position changed to a low level by a high level, and between the low period, control unit MCU will be preset
EDID is write to the EDID memories, and HPD signal is returned back into the high level again afterwards.When returning back to high level, image
Input source, which can be read, newly to be write to the information in EDID memories, by one section of read access time and then according to the renewal
EDID exports new picture and gives video and audio output device D1 and D2.
As shown in Figures 1 and 3, this situation is occurred when changing screen to another situation, and audio-visual output dress is changed one
In the use situation put, control unit (MCU) meeting EDID according to possessed by all video and audio output devices of video switch
To determine optimal output picture, now, when video and audio output device is replaced with D3 by user by D2, control unit
(MCU) an optimal EDID is first determined by D1 and D3 EDID according to video and audio output device, control unit (MCU) can control afterwards
HPD signal on one hot plug detection pin position is changed to a low level by a high level, between the low period, by audio-visual output
EDID possessed by device D3 is write to the EDID memories, returns back to the high level again afterwards.When returning back to high level,
Image input source, which can be read, newly to be write to the information in EDID memories, by one section of read access time and then according to the renewal
EDID export new picture and give video and audio output device D1 and D3.
In traditional framework, when above-mentioned control unit (MCU) writes EDID to EDID memories, image input source
The reading to EDID memories can be interrupted, after control unit (MCU) completes write activity, then recovers to read the EDID.And
EDID is write to EDID memories and image input source in control unit MCU and recovers to read the EDID in the EDID memories
During this section of information, image input source is normally can not to go out picture and cause video and audio output device D1 and D2 or D1 and D3 without Faxian
Show image.
It can not go out the time of picture to shorten audio-visual display device, therefore need a kind of video switch and its switching method badly
To solve the problem that conventional art.
The content of the invention
The main purpose of the present invention is to provide a kind of video switch, when display information to be updated, passes through a switching
New mechanism display information, can not shorten the time of picture.
In one embodiment, the present invention provides a kind of video switch, comprising：One control unit；And at least one display
Information switch module, it is electrically connected with the control unit, and each display information handover module further includes：One first storage mould
Block, store one first display information；One second memory module；One first switch unit, select first and second memory module
One of them is electrically connected with the control unit；And one second switch unit, selection are electrically connected with the first memory module, with
Transmit first display information；Wherein, when to update first display information, the control unit passes through first switch unit
One second display information is stored in second memory module, and after storage, second switch unit switching is connected to
Second memory module is to export second display information.
In another embodiment, the present invention provides a kind of image switching method, includes the following steps：Offer is connected at least
One video switch of one image source and at least a video and audio output device；Select an at least video and audio output device and therein one
Image source couples；Selected image source reads the first display information stored in the video switch, with according to this first
Display information exports a signal of video signal to the video switch；The video switch exports the signal of video signal to the audio-visual of selection
Output device；When to update first display information with one second display information, second display information is first stored, its
In, during second display information is stored, the selected image source, which does not interrupt, reads first display information；And
After storing second display information and finishing, the image source is set to read second display information.
On the advantages and spirit of the present invention, can be obtained further by following embodiment and institute's accompanying drawings
Solution.
Brief description of the drawings
Fig. 1 is the matrix form switching system configuration diagram of conventional art.
Fig. 2 and Fig. 3 is that traditional EDID updates time diagram.
Fig. 4 is the embodiment of the method flow chart of the present invention.
Fig. 5 is an embodiment framework block schematic diagram of the video switch of the present invention.
Fig. 6 is the display information handover module embodiment block diagram of the present invention.
Fig. 7 and Fig. 8 is the renewal display information difference embodiment signal of video signal output of the present invention with interrupting schematic diagram.
【Symbol description】
1 video switch
11 control units
110 memories
12 display information handover modules
121 first switch units
122 second switch units
123 first memory modules
124 second memory modules
13a, 13b signal processing unit
V1, V2 image source
D1, D2 video and audio output device
Embodiment
With schema word narration will be coordinated to disclose multiple embodiments of the invention below, it is as clearly stated, many
Details in practice will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit
The present invention.In addition, for the sake of simplifying schema, some traditional structures will be painted in a manner of simply illustrating in the drawings with element
Go out.
Referring to Fig. 4, the figure is the renewal EDID schematic flow sheets of the present invention.The flow includes the following steps：First
Carry out step S1, there is provided be connected to an at least image source and a video switch of an at least video and audio output device.In this step
In, Fig. 5 and Fig. 6 is refer to, wherein, Fig. 5 is an embodiment block diagram of video switch of the present invention, and Fig. 6 shows for the present invention
One embodiment block diagram of information switch module.As shown in figure 5, video switch 1 has control unit 11 and control unit 11
Multiple display information handover modules 12 of electrical connection, the multiple input ports and output port for being coupled to control unit 11, and
Multiple signal processing unit 13a and 13b.Input port is connected multiple image source V1, V2 ... and audio-visual defeated with output port respectively
Go out device D1, D2 ... and wait input/output unit.The input port and output port can select for HDMI, DVI interface,
One of DisplayPort interfaces, Thunderbolt interfaces and USB interface.The image source is then with HDMI, DVI
The computer of interface, DisplayPort interfaces, Thunderbolt interfaces or USB interface image output or audio and video information,
DVD player either Blu-ray player etc., but be not limited.Video and audio output device D1, D2 ... can be then liquid crystal electricity
There is the display of image frame fan-out capability depending on, plasma-screen television or projector etc..Each video and audio output device D1, D2 ... is respectively
With respective EDID.
Video switch 1 can select wherein to specify each image source V1, V2 ... image output according to switching command
Or video-audio signal is exported to one or more video and audio output devices D1, D2 ....In one embodiment, each image source V1,
The image or audio and video information of V2 ... inputs are inputted to the signal processing unit 13a processing being connected via corresponding input port.
In the present embodiment, signal processing unit 13a to for an audio-visual receiver (receiver), such as：HDMI receiver or DVI connect
Device is received the signal inputted via input port is converted into image information, acoustic information and control information, such as：HPD、
The information such as CEC.These information can be cut by a handover module according to video and audio output device D1, D2 of destination to carry out path
Change.Similarly, video and audio output device D1, D2 ... of destination is also electrically connected with signal processing unit 13b respectively, and it is as a shadow
Sound conveyer (transmitter).Image information, acoustic information and control information by selection switching can pass through at signal
Video and audio output device D1, D2 is converted into and manages unit 13b ... corresponding specification signal, such as：HDMI or DVI specifications, and export extremely
Video and audio output device D1, D2.
Each display information handover module 12 is corresponding with each image source V1, V2 respectively, to handle EDID letters
Breath, to shorten the time that image source V1, V2 do not go out picture.As shown in fig. 6, it is display information handover module framework of the invention
One embodiment block schematic diagram.In the present embodiment, display information handover module 12 is electrically connected with control unit 11, and it includes the
One switch unit 121, the second switch unit 122, the first memory module 123 and the second memory module 124.Wherein first and second
Switch unit 121 and 122 can be analog or digital switch, and first and second memory module 123 is with 124 storing
EDID, the EDID for being stored in the first memory module 123 is defined as the first display information herein, is stored in the second memory module
124 EDID is defined as the second display information.First switch unit 121 stores mould with the first memory module 123 and second respectively
Block 124 and control unit 11 are electrically connected with, and it mainly selects one of first and second memory module 123 or 124 and control
Unit 11 is electrically connected with, and the second switch unit 122 is selecting first or second memory module 123 or 124 one of them and shadow
Image source V1 is electrically connected with to establish the transmission channel of bidirectional information.It should be noted that in one embodiment, foregoing transmission channel
For a kind of DDC (display data channel, DDC), to provide interactively integrated circuit (Inter
Integrated Circuit, I2C) communications protocol carry out both-way communication.
Fig. 4 is returned, then as step S2 selects multiple video and audio output devices to be coupled with one of them image source.It please coordinate
Refering to Fig. 5, in this step, to select image source V1 while export to video and audio output device D1 and D2 to explain.Then such as
Shown in Fig. 4, carry out the selected image sources of step S3 and read the first display information stored in the video switch, with basis
First display information exports a signal of video signal to the video switch.In this step, please coordinate shown in Fig. 5 and Fig. 6, with shadow
Display information handover module 12 corresponding to image source V1 is explained, it is assumed that it is aobvious that first has been stored with the first memory module 123
Show information, that is, EDID, now, the second switch unit 122, which can switch, allows image source V1 and the first memory module to be electrically connected with, with
The passage of communication is established, the present embodiment is DDC passages.Now image source V1 by DDC passages and I2C communication protocol from
One memory module 123 reads the first display information, to complete step S3.Return shown in Fig. 4, after step S3, continue into
Row step S4, image source V1 go out picture according to the content of the first display information and connect this to video switch 1, the video switch 1
Receive the image from image source V1 or video-audio signal exports video and audio output device D1 and D2 to selection.
Then, when renewal EDID information in need, it is updated in a manner of step S5 and S6.Explanation step S5 with
Before S6 is updated, first explanation may update EDID opportunity.In one embodiment, with the video switch 1 shown in Fig. 5
Illustrating, video switch 1 is supplied to image source EDID information probably to have following several modes, and the first pattern is preset mode,
That is, there is EDID preset value in video switch, picture can be exported using the preset value as image source in this mode
The foundation in face；Second of pattern is particular port pattern, in such a mode, the audio-visual output mainly to be coupled with particular port
EDID possessed by device is used as the foundation that image source goes out picture, and in one embodiment, the particular port can be first port,
But it is not limited system.Another pattern is automatic mode, and in such a mode, control unit 11 can go out picture as needed extremely
EDID possessed by a few video and audio output device determines an optimization EDID, to go out the foundation of picture as image source.It is above-mentioned
Under this several modes, the method that the present invention updates EDID can be used, to shorten the time that image source does not go out picture.
Therefore, when renewal image source in need goes out the EDID needed for picture, that is, when being updated with one second display information
During first display information, as shown in step s 5, second display information is first stored, wherein, believe in storing second display
During breath, the selected image source, which does not interrupt, reads first display information.In this step, Fig. 5-7 are referred to,
In Fig. 7, the picture for coming from image source V1, this section of phase are persistently exported with the image output device D1 and D2 of video switch coupling
Between in the display information handover module 12 coupled with image source V1 the second switch unit 122 be connected image source V1 and first storage
Module 123 so that image source V1 can read the first display information stored in the first memory module 123 by passage, also
That is EDID and export picture and give video and audio output device D1 and D2.After T0 time, when user will be with video switch
During foundations of the default EDID as image source V1 output pictures, now control unit 11 sends control signal, with control this
One switch unit 121 switches to the second memory module 124 so that the second memory module 124 is electrically connected with control unit 11.It
Afterwards, control unit 11 can will be stored in the default EDID of its built-in storage 110, that is, the second display information in step S5, warp
By I2C communications protocol, but it is not limited, writes to second memory module 124.To illustrate that default EDID is not
To be stored in inside control unit as limitation, in another embodiment, default EDID can also prestore and be stored in image controller
Memory module, control unit 11 arrive again the module reading.From figure 7 it can be seen that in store second display information in this
During two memory modules 124, the selected image source, which does not interrupt, reads first display information.That is, T1 when
In, image source V1 still can continue to read the first display information in first memory module 123, and cause audio-visual defeated
Going out device D1 and D2 can maintain to continue to output image source V1 picture.
Then, step S6 is carried out, stores after second display information finishes, the image source is read the second display letter
Breath.In step s 6, control unit 11 controls a hot plug signal to be changed by a high level to a low level, and in the low level
Period, second switch unit 122 switching image source V1 is controlled to be electrically connected with second memory module 124, to establish letter
Passage is ceased, such as：DDC passages.It is noted that hot plug signal (Hot Plug Detection, HPD), is HDMI or DVI
Detection signal in specification, it is to be exported by the HDMI of video and audio output device or the stitch of one of DVI interface, to provide
Image source determines whether screen update according to the low and high level of the signal, and the EDID information of video and audio output device is read with profit.
In general, HPD signal is changed to low level from high level, then from low level return back to high level when, then represent audio-visual output
Device has altered, and now image source can read the EDID information of video and audio output device.In an embodiment of the present invention, it is and indirect
The low and high level for the HPD signal that video and audio output device is exported is directly read by image source, but passes through the control in switch
Unit 11 processed controls HPD to make high level or low level change, and then can control image source reading EDID opportunity.
Due in the present embodiment, being to be used as image source by the EDID of internal preset to go out picture foundation, therefore actually
The situation for changing video and audio output device is had no, so actively disconnecting the HPD signal between image source V1, mould by control unit 11
Draw up video and audio output device to pull out, and image source V1 is thought that video and audio output device has disconnected with it, and in the low level one
The high level is returned back to after section time T2 again, and make it that image source V1 thinks that video and audio output device has connected, and is actively read
EDID, the selected image source V1 is read second display in the second storage module 124 via the DDC information channels and believe
Breath.By T3 read access time, after image source V1 completes to read second display information, image source V1 can be according to reading
The second display information output image signal give video and audio output device D1 and D2.In T2 and T3 time, to defeated in image source
Frame out gives display D1 and D2.From figure 7 it can be seen that when updating EDID display informations, due to being cut with first and second
Change the switching of unit 121 and 122 and the second memory module 124, thus can in store second display information in this second
During memory module 124, the selected image source, which does not interrupt, reads first display information, therefore, in T1 time
Interior, image source V1 still can continue to read the first display information in first memory module 123 so that audio-visual output dress
That puts D1 and D2 does not go out the picture time, and T2+T3 is foreshortened to by traditional picture time T1+T2+T3 that do not go out.
Fig. 4-6 and Fig. 8 are referred to, it is illustrating step S5 and S6 another embodiment.Previous embodiment is to cut
Default EDID in parallel operation updates, and the present embodiment then updates EDID to change during video and audio output device.In the present embodiment, such as
Shown in Fig. 5 and Fig. 8, image source V1 is according to the first display information being stored in the first memory module 123, that is, EDID information,
Video and audio output device D1 and D2 are given to provide corresponding picture, and through T0 after a while.Changed when by video and audio output device D2
During into D3, video and audio output device D3 EDID first can first controlled unit 11 read to the memory of inside, now control is single
The pattern that member 11 can update according to EDID, such as automatic mode or particular port pattern, to be judged.It is in automatic mode
Example, after video and audio output device D3 EDID information is read to memory 110 in control unit 11, control unit 11 can root
According to needing EDID possessed by the video and audio output device D1 and D3 of picture to determine an optimal EDID, to as image source V1
Go out the foundation of picture.After optimal EDID is determined, it is referred to as below with the second display information, step S5, corresponding image can be carried out
The first switch unit 121 in source V1 display information handover module 12 is electric by 11 and second memory module of control unit 124
Property connection, the control unit 11 communications protocol by second display information via I2C again transmitted to second memory module
124 are stored.In the T1 time courses of storage, image source V1 does not interrupt aobvious to the first memory module 123 reading first
Show information, therefore picture persistently can be gone out to video and audio output device D1.
After storage finishes, step S6 is carried out, control unit 11 controls a HPD signal to be changed by a high level to a low electricity
It is flat, to simulate the state that video and audio output device is disconnected, and between the low period, control second switch unit 122 to switch
Image source V1 is electrically connected with second memory module 124, to establish information channel, is switched to the low level for a period of time after T2
The high level is returned back to again, and to simulate the state that video and audio output device is connected, control HPD high level and low level principle are such as
Preceding described, therefore not to repeat here.Then, the selected image source V1 is made to read the second storage mould via the DDC information channels
Second display information in block 124.By T3 times, after image source V1 completes to read second display information, image source
V1 can give video and audio output device D1 and D3 according to the second display information output image signal read.From figure 8, it is seen that
When updating EDID display informations, due to first and second switch unit 121 and 122 and the second memory module 124
Switching, therefore can be in storing second display information during second memory module 124, that is, in T1 time
Interior, image source V1 still can continue to read the first display information in first memory module 123 without because write-in
Second display information and interrupt, and allow video and audio output device D1 to maintain to continue to output image source V1 picture.So that shadow
Sound output device D1's does not go out the picture time, and T2+T3 is foreshortened to by traditional picture time T1+T2+T3 that do not go out.Though it is noted that
So it is foregoing be in automatic mode come illustrate change video and audio output device renewal EDID modes, according to same principle, if
In the case that selection uses particular port pattern, when the video and audio output device of the renewal particular port, switch renewal
EDID mode is also as previously described.
It is noted that in foregoing renewal EDID embodiment, the first switch unit 121 and the second switch unit 122,
The control condition of mutual exclusion is not limited, also and the first switch unit 121 is not synchronous with the second switch unit 122 is reversely cut
Change, but the first switch unit 121 determines be electrically connected with which memory module according to the control signal of control unit 11.
In another embodiment, the control of the switch unit 122 of the first switch unit 121 and second can be the control mode of mutual exclusion,
That is, when second switch unit 122 is switched to and coupled with the second memory module 124, the first switch unit 121 is then same
Step is switched to be coupled with the first memory module 123, conversely, being coupled when the second switch unit 122 is switched to the first memory module 123
When, then synchronism switching couples the first switch unit 121 to the second memory module 124.Therefore, can be with as shown in fig.6, working as
During T0 period, the second switch unit 122 couples with first memory module 123；Now, first switch unit 121 then with
Second memory module 124 couples.Therefore image source V1 can read in the first memory module 123 via DDC passages and be deposited
First display information of storage, and picture is gone out according to first display information and gives video and audio output device D1 and D2.When will with second display
During the first display information of information updating, such as：During Fig. 7-8 situation, second display can be believed according to step S5 control units 11
Second display information is stored in the second memory module 124 by breath via the first switch unit 121.The storage of elapsed time T1 finishes it
Afterwards, control unit 11 can control is pulled to low level by the HPD signal between image source, and now, control unit can control simultaneously
Two switch units 122 couple with the second memory module 124, and Synchronization Control the first switch unit 121 and the first memory module
123 couplings.After low level is through T2 after a while, step S6 is carried out, control unit 11 believes the HPD between image source V1
Number high level is switched to, and allows image source V1 to read the second display information in second memory module 124.It has passed through one section of reading
After time T3, image source V1 goes out picture and gives video and audio output device D1 and D2 again.Similarly, the display of storage second is believed in step s 5
Cease in the time of second display module, image source V1 still can smoothly read and be stored in the first memory module 123
The first display information, therefore write the second display information during the second memory module 124, image source V1 can be suitable
Profit goes out picture, will not interrupt.
Hold, the conventional art compared to Fig. 1-3, the present embodiment utilizes the switching of display information handover module, with timesharing
Mode update display information, therefore can extend and picture time T1, video and audio output device does not go out when updating display information to shorten
The time of picture.
Pass through the detailed description of embodiments above, it would be desirable to more clearly describe the feature and spirit of the present invention, and be not
Scope of the invention is any limitation as with above-mentioned disclosed preferred embodiment, any those skilled in the art, not
Depart from the spirit and scope of the present invention in, when can do it is various change and retouching.Therefore, protection scope of the present invention is when with appended
What claim was defined is defined.
Claims (14)
1. a kind of video switch, comprising：
One control unit；And
An at least display information handover module, it is electrically connected with the control unit, and each display information handover module further includes：
One first memory module, store one first display information；
One second memory module；
One first switch unit, one of first and second memory module is selected to be electrically connected with the control unit；And
One second switch unit, selection is electrically connected with the first memory module, to transmit first display information；
Wherein, when to update first display information, the control unit is believed one second display by first switch unit
Breath is stored in second memory module, and after storage, second switch unit switching is connected to second memory module
To export second display information.
2. video switch as claimed in claim 1, it is characterised in that first and second switch unit is that a simulation switches
Device or a digital switcher.
3. video switch as claimed in claim 1, it is characterised in that the control unit is stored in second display information
After second memory module, control one hot plug detection pin position is changed to a low level by a high level replys again after for a period of time
To the high level.
4. video switch as claimed in claim 3, it is characterised in that second switch unit is when the low level, selection
It is electrically connected with second memory module, and provides an image source when high level is returned back to and read in second memory module
Second display information.
5. video switch as claimed in claim 1, it is characterised in that each display information handover module more with an input
Mouthful it is connected, the input port is receiving first or second display information exported via second switch unit.
6. video switch as claimed in claim 5, it is characterised in that the control unit is more coupled with multiple output ports,
The image information that each output port is received according to a switching control selections reception input port therein.
7. video switch as claimed in claim 6, it is characterised in that this in each display information handover module is second aobvious
Show information as the control unit as selecting at least output end that output port corresponding with the display information handover module couples
Mouth produces because changing at least 1 the 3rd display information decision that video and audio output device is received.
8. video switch as claimed in claim 7, it is characterised in that the control unit in an at least output port coupling
Determine an optimization display information as second display information in 3rd display information possessed by the video and audio output device connect
Either the control unit is directly used as second display using the 3rd display information possessed by the video and audio output device of replacing
Information.
9. video switch as claimed in claim 1, it is characterised in that the control unit is used as this using a default display information
Second display information.
10. a kind of image switching method, includes the following steps：
Offer is connected to an at least image source and a video switch of an at least video and audio output device, the video switch include
One control unit and at least a display information handover module, it is electrically connected with the control unit, each display information switching
Module further includes the first memory module, one second memory module of one first display information one of storage, selects this first and second
One first switch unit and selection and the first memory module electricity that one of memory module is electrically connected with the control unit
Property connection, to transmit one second switch unit of first display information；
An at least video and audio output device is selected to be coupled with an image source therein；
Selected image source reads the first display information stored in first memory module, to be believed according to first display
Breath exports a signal of video signal to the video switch；
The video switch exports the signal of video signal video and audio output device to selection；
When to update first display information with one second display information, the control unit should by first switch unit
Second display information is first stored in second memory module, wherein, during second display information is stored, this is chosen
Image source, which does not interrupt, reads first display information；
Store after second display information finishes, second switch unit switching is connected to second memory module；And
The image source is set to read second display information.
11. image switching method as claimed in claim 10, it is characterised in that further included after second display information is stored up
The following steps：
A hot plug signal is controlled to be changed by a high level to a low level；
Between the low period, selected image source is set to be coupled with second memory module by a switching；
The high level is returned back to again after being switched to the low level for a period of time, the selected image source is read the second storage mould
Second display information in block.
12. image switching method as claimed in claim 10, it is characterised in that second display information is to be stored in the image
A default display information in switch.
13. image switching method as claimed in claim 10, it is characterised in that second display information is produced by the following steps
It is raw：
Selected video and audio output device is changed with least one new video and audio output device；
Second display information is determined according to one the 3rd display information that at least one new video and audio output device has respectively.
14. image switching method as claimed in claim 13, it is characterised in that the control unit in an at least output end
Determine an optimization display information as second display in 3rd display information possessed by the video and audio output device of mouth coupling
Information either the control unit directly using the 3rd display information possessed by the video and audio output device of replacing as this second
Display information.
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| TW103112353A TWI518673B (en) | 2014-04-02 | 2014-04-02 | Video switch and switching method thereof |
| TW103112353 | 2014-04-02 |
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| US10269325B2 (en) | 2016-02-05 | 2019-04-23 | Advoli Limited | Display system for an array of video displays |
| TWI588738B (en) * | 2016-02-05 | 2017-06-21 | 韌硬軟機電股份有限公司 | Display system for an array of video displays |
| TWI627860B (en) | 2016-05-31 | 2018-06-21 | 晨星半導體股份有限公司 | Video processing device and method |
| CN106686332B (en) * | 2016-11-17 | 2020-07-14 | 西安诺瓦星云科技股份有限公司 | Video display control method and EDID management method |
| CN107749966B (en) * | 2017-11-07 | 2021-05-18 | 环旭(深圳)电子科创有限公司 | Image input/output switching method and electronic device |
| TWI675591B (en) * | 2017-12-07 | 2019-10-21 | 宏正自動科技股份有限公司 | Video streaming synchronization switching method for video wall system |
| TWI679895B (en) * | 2017-12-15 | 2019-12-11 | 宏正自動科技股份有限公司 | Electronic device and image synchronization method |
| CN114205660A (en) * | 2020-09-18 | 2022-03-18 | 明基智能科技（上海）有限公司 | Screen resolution adjusting method and display device thereof |
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| Publication number | Publication date |
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| TWI518673B (en) | 2016-01-21 |
| CN104980666A (en) | 2015-10-14 |
| TW201539424A (en) | 2015-10-16 |
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