CN104980666A - Video switcher and switching method thereof - Google Patents
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- CN104980666A CN104980666A CN201410400384.6A CN201410400384A CN104980666A CN 104980666 A CN104980666 A CN 104980666A CN 201410400384 A CN201410400384 A CN 201410400384A CN 104980666 A CN104980666 A CN 104980666A
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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 has about a kind of image switch, espespecially a kind of in extension display capabilities identification data (the Extended Display Identification Data upgrading display unit, EDID), time, image switch and changing method thereof that image does not go out the picture time is shortened.
Background technology
At traditional Image sources, such as: computer, DVD player or blue-ray DVD player etc., with video and audio output device, such as: in the framework of the combination of display or display and loudspeaker, the picture data that video and audio output device can support display can be exported to allow Image sources, generally speaking, Image sources is via DDC (Display Data Channel, DDC) EDID of inquiry display, make Image sources can learn the basic parameter of video and audio output device, such as: manufacturer and support resolution of screen etc., and then the image information corresponding to video and audio output device can be exported, best in quality in display unit show image.
Owing to showing the demand diversification in market, such as: stage performance, sportscast or control centre and any system need instant video to switch or video wall combination, the image switch of matrix form provides a switching interface for many displays source and multi-display apparatus in the conventional technology, in order to provide solution in response to difference uses situation demand.The image switch of so-called matrix form, it has and couples multiple audio-visual input source and couple multiple video and audio output device.Pass through switching controls, multiple audio-visual input source can be allowed to export to multiple video and audio output device respectively, or single audio-visual input source exports to multiple video and audio output device, and produce the display effect that segmentation copies picture (splitter) or video wall (video wall).
At multiple audio-visual input source, in the image switch of matrix form and the combo architectures of multiple video and audio output device, each audio-visual input source obtains the EDID of video and audio output device equally via this image switch, when audio-visual input source is after exporting audio-visual or image information, when upgrading EDID if necessary, such as: when changing video and audio output device, or under specific circumstances, when changing the parameter exporting audio-visual or image using the EDID of this image switch internal preset as audio-visual input source, can because audio-visual input source will upgrade EDID and produce the of short duration situation without picture.
Please refer to Fig. 1 to Fig. 3, wherein, Fig. 1 is traditional image switch configuration diagram, schematic diagram when Fig. 2 to Fig. 3 is traditional image switch renewal EDID.As shown in Figure 1, the input port of image switch couples image input source, the corresponding EDID memory of each input source, such as: EEPROM, and the output port of image switch is coupled with video and audio output device D1 and D2, wherein video and audio output device D1 and D2 has respective EDID respectively.For example, in one case, as shown in Figures 1 and 2, when user will use the default EDID of image switch inside to upgrade the EDID information stored in original EDID memory, control unit (Micro Control Unit, MCU) hot plug can be controlled and detect (Hot Plug Detection, HPD) pin position is converted to a low level by a high level, in between this low period, default EDID writes in this EDID memory by control unit MCU, again HPD signal is returned back to this high level afterwards.When returning back to high level, image input source can read the information newly write in EDID memory, after one reading period, then exports new picture to video and audio output device D1 and D2 according to the EDID of this renewal.
Another kind of situation as shown in Figures 1 and 3, this situation is when occurring in replacing screen, change in the use situation of video and audio output device one, the EDID that the control unit (MCU) of image switch can have according to all video and audio output device decides best output picture, now, when video and audio output device will be replaced with D3 by D2 by user time, control unit (MCU) first determines a best EDID according to video and audio output device by the EDID of D1 and D3, the HPD signal that control unit (MCU) can control on a hot plug detection pin position is afterwards converted to a low level by a high level, in between this low period, the EDID had by video and audio output device D3 writes in this EDID memory, return back to this high level more afterwards.When returning back to high level, image input source can read the information newly write in EDID memory, after one reading period, then exports new picture to video and audio output device D1 and D3 according to the EDID of this renewal.
In traditional framework, when EDID is write to EDID memory by above-mentioned control unit (MCU), image input source can interrupt the reading to EDID memory, until after control unit (MCU) completes write activity, then recovers to read this EDID.And during EDID to be write to EDID memory by control unit MCU and image input source recovers this section of the EDID information read in this EDID memory, image input source normally cannot go out picture and cause video and audio output device D1 and D2 or D1 and D3 cannot show image.
The time of picture cannot be gone out to shorten audio-visual display unit, therefore needing a kind of image switch and changing method thereof badly and solving the problem that conventional art produces.
Summary of the invention
The main object of the present invention is to provide a kind of image switch, when upgrading display information, upgrades display information, can not shorten the time of picture by a handover mechanism.
In one embodiment, the invention provides a kind of image switch, comprise: a control unit; And at least one display information switch module, itself and this control unit is electrically connected, and each display information switch module more comprises: one first memory module, stores one first display information; One second memory module; One first switch unit, selects this first and second memory module one of them and this control unit to be electrically connected; And one second switch unit, select to be electrically connected with the first memory module, to transmit this first display information; Wherein, when this first display information will be upgraded, one second display information is stored in this second memory module by this first switch unit by this control unit, and after storage, the switching of this second switch unit is connected to this second memory module to export this second display information.
In another embodiment, the invention provides a kind of image changing method, include the following step: the image switch being connected at least one image source and at least one video and audio output device is provided; At least one video and audio output device is selected to couple with an image source wherein; By the image source selected to read in this image switch the first display information of storing, to export a signal of video signal according to this first display information to this image switch; This signal of video signal is exported to the video and audio output device of selection by this image switch; When showing this first display information of information updating with one second, this second display information first stored, wherein, in the process storing this second display information, this is selected image source not interrupt reading this first display information; And after this second display information of storage is complete, make this image source read this second display information.
About the advantages and spirit of the present invention, can be further understood by following execution mode and institute's accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the matrix form switched system configuration diagram of conventional art.
Fig. 2 and Fig. 3 is that traditional EDID upgrades time diagram.
Fig. 4 is an embodiment of the method flow chart of the present invention.
Fig. 5 is an embodiment framework block schematic diagram of image switch of the present invention.
Fig. 6 is display information switch module embodiment calcspar of the present invention.
Fig. 7 and Fig. 8 is that the different embodiment signal of video signal of renewal display information of the present invention exports and interrupts schematic diagram.
[symbol description]
1 image switch
11 control units
110 memories
12 display information switch 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
Below will disclose multiple execution mode of the present invention with graphic cooperation character narrate, as clearly stated, the details in many practices will be explained in the following description.But should be appreciated that, the details in these practices is not applied to limit the present invention.In addition, for the purpose of simplicity of illustration, some traditional structures and element are drawn in the mode simply illustrated in the drawings.
Refer to Fig. 4, this figure is renewal EDID schematic flow sheet of the present invention.This flow process includes the following step: first carry out step S1, provides the image switch being connected at least one image source and at least one video and audio output device.In this step, please refer to Fig. 5 and Fig. 6, wherein, Fig. 5 is an embodiment calcspar of image switch of the present invention, and Fig. 6 is the embodiment calcspar that the present invention shows information switch module.As shown in Figure 5, image switch 1 has control unit 11, the multiple display information switch modules 12 be electrically connected with control unit 11, the multiple input port being coupled to control unit 11 and output port, and multiple signal processing unit 13a and 13b.Input port and output port are connected multiple image source V1, V2 respectively ... and video and audio output device D1, D2 ... Deng input/output unit.This input port and output port can be chosen as HDMI, DVI interface, DisplayPort interface, Thunderbolt interface and USB interface one of them.This image source is then with HDMI, DVI interface, DisplayPort interface, Thunderbolt interface or the computer of USB interface image output or audio and video information, DVD player or Blu-ray player etc., but not as limit.This video and audio output device D1, D2 ... it can be then the display that LCD TV, plasma-screen television or projector etc. have image frame fan-out capability.Each video and audio output device D1, D2 ... there is respective EDID respectively.
Image switch 1 can be selected wherein to specify each image source V1, V2 according to switching command ... image output or video-audio signal export one or more video and audio output device D1, D2 to ...In one embodiment, each image source V1, V2 ... the image of input or audio and video information input to via the input port of correspondence the signal processing unit 13a process be connected.In the present embodiment, signal processing unit 13a is with thinking an audio-visual receiver (receiver), such as: HDMI receiver or DVI receiver in order to convert the signal inputted via input port to image information, acoustic information and control information, such as: the information such as HPD, CEC.These information can pass through a handover module, and video and audio output device D1, D2 according to destination carry out path switching.In like manner, video and audio output device D1, the D2 of destination ... also be electrically connected with signal processing unit 13b respectively, it is as an audio-visual conveyer (transmitter).Video and audio output device D1, D2 can be converted to through signal processing unit 13b through selecting the image information of switching, acoustic information and control information ... corresponding specification signal, such as: HDMI or DVI specification, and exports video and audio output device D1, D2 to.
Each display information switch module 12 is corresponding with each image source V1, V2 respectively, in order to process EDID information, to shorten the time that image source V1, V2 do not go out picture.As shown in Figure 6, it is an embodiment block schematic diagram of display information switch module framework of the present invention.In the present embodiment, display information switch module 12 is electrically connected with control unit 11, and it comprises the first switch unit 121, second switch unit 122, 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, first and second memory module 123 and 124 is in order to store EDID, the EDID being stored in the first memory module 123 is defined as the first display information herein, the EDID being stored in the second memory module 124 is defined as the second display information.First switch unit 121 is electrically connected with the first memory module 123 and the second memory module 124 and control unit 11 respectively, it mainly selects first and second memory module 123 or 124 one of them and control unit 11 to be electrically connected, and the second switch unit 122 is electrically connected transmission channel to set up bidirectional information in order to select the first or second memory module 123 or 124 one of them and image source V1.Should be noted that, in one embodiment, aforesaid transmission channel is a kind of DDC (display data channel, DDC), in order to provide the communications protocol of interactively integrated circuit (Inter Integrated Circuit, I2C) to carry out both-way communication.
Return Fig. 4, then as step S2 selects multiple video and audio output device and one of them image source to couple.Please refer to Fig. 5, in this step, to select image source V1 to export to video and audio output device D1 and D2 to explain simultaneously.Then as shown in Figure 4, carry out step S3 by the image source of selection to read in this image switch the first display information of storing, to export a signal of video signal according to this first display information to this image switch.In this step, please coordinate shown in Fig. 5 and Fig. 6, explain with the display information switch module 12 that image source V1 is corresponding, suppose to have stored the first display information in the first memory module 123, that is EDID, now, the second switch unit 122 can switch allows image source V1 and the first memory module be electrically connected, to set up the passage of communication, the present embodiment is DDC passage.Now image source V1 reads the first display information, with completing steps S3 by the communication protocol of DDC passage and I2C from the first memory module 123.Return shown in Fig. 4, after step S3, proceed step S4, image source V1 goes out picture to image switch 1 according to the content of the first display information, and this is received video and audio output device D1 and the D2 exporting to selection from the image of image source V1 or video-audio signal by this image switch 1.
Then, when have need upgrade EDID information time, upgrade in the mode of step S5 and S6.Before description of step S5 and S6 upgrades, be first described the opportunity that may upgrade EDID.In one embodiment, illustrate with the image switch 1 shown in Fig. 5, image switch 1 is supplied to image source EDID information probably following several modes, the first pattern is preset mode, that is there is in image switch the preset value of EDID, in this mode, the foundation of picture can be exported using this preset value as image source; The second pattern is particular port pattern, in such a mode, the EDID mainly had with the video and audio output device coupled with particular port is used as the foundation that image source goes out picture, in one embodiment, this particular port can be first end mouth, but not as restriction.Another pattern is automatic mode, and in such a mode, the EDID that at least one the video and audio output device that control unit 11 can go out picture as required has determines an optimization EDID, in order to go out the foundation of picture as image source.Under this several modes above-mentioned, the method that the present invention upgrades EDID can be used, shorten the time that image source does not go out picture.
Therefore, when have need upgrade image source go out the EDID needed for picture time, that is, when this first display information of information updating will be shown with one second, as shown in step s 5, this second display information is first stored, wherein, in the process storing this second display information, this is selected image source not interrupt reading this first display information.In this step, refer to Fig. 5-7, in the figure 7, image output device D1 and the D2 coupled with image switch continues to export the picture coming from image source V1, during this section, in the display information switch module 12 coupled with image source V1, the second switch unit 122 is connected image source V1 and the first memory module 123, make image source V1 can read by passage the first display information stored in the first memory module 123, that is EDID and export picture to video and audio output device D1 and D2.After the time of T0, when the EDID that user will preset in image switch exports the foundation of picture as image source V1, now control unit 11 sends control signal, switch to the second memory module 124 to control this first switch unit 121, the second memory module 124 is electrically connected with control unit 11.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, via the communications protocol of I2C, but not as limit, writes in this second memory module 124.Be noted that default EDID is inner for restriction to be stored in control unit, in another embodiment, default EDID also can prestore the memory module be stored in image controller, and control unit 11 arrive the reading of this module again.As can be seen from Figure 7, in this second display information of storage in the process of this second memory module 124, this is selected image source not interrupt reading this first display information.That is within the time of T1, this image source V1 still can continue the first display information read in this first memory module 123, and make video and audio output device D1 and D2 can maintain the picture continuing image output source V1.
Then, carry out step S6, store this second display information complete after, make this image source read this second display information.In step s 6, control unit 11 controls a hot plug signal and is converted to a low level by a high level, and between this low period, controls this second switch unit 122 and switches this image source V1 and this second memory module 124 is electrically connected, to set up information channel, such as: DDC passage.Be noted that, hot plug signal (Hot Plug Detection, HPD), it is the detection signal in HDMI or DVI specification, that stitch one of in HDMI or the DVI interface by video and audio output device exports, in order to provide image source to judge whether screen update according to the low and high level of this signal, in order to the EDID information reading video and audio output device.Generally speaking, HPD signal is changed to low level from high level, then when returning back to high level from low level, then representing video and audio output device has change, and now image source can read the EDID information of video and audio output device.In an embodiment of the present invention, and non-immediate directly reads the low and high level of the HPD signal that video and audio output device exports by image source, but do high level or low level change by the control unit 11 control HPD in switch, and then the opportunity that image source reads EDID can be controlled.
Due in the present embodiment, be used as image source by the EDID of internal preset to go out picture foundation, therefore in fact there is no the situation changing video and audio output device, so by the HPD signal of control unit 11 initiatively between disconnection and image source V1, simulate video and audio output device to pull out, and make image source V1 think video and audio output device with its disconnection, and this high level is returned back to again after this low level a period of time T2, and video and audio output device has connected to make image source V1 think, and initiatively read EDID, this is made to be read this second display information in this second storage module 124 via this DDC information channel by the image source V1 that selects.Through the reading time of T3, after image source V1 completes this second display information of reading, image source V1 can according to the second display information output image signal read to video and audio output device D1 and D2.In the time of T2 and T3, to exporting picture to display D1 and D2 in image source.As can be seen from Figure 7, when upgrading EDID and showing information, owing to having the switching of first and second switch unit 121 and 122 and the second memory module 124, therefore can in this second display information of storage in the process of this second memory module 124, this is selected image source not interrupt reading this first display information, therefore, within the time of T1, this image source V1 still can continue the first display information read in this first memory module 123, make that video and audio output device D1 and D2's do not go out the picture time, T2+T3 is foreshortened to by traditional picture time T1+T2+T3 that do not go out.
Refer to Fig. 4-6 and Fig. 8, it is in order to another embodiment of description of step S5 and S6.Previous embodiment is upgrade with the default EDID in switch, and the present embodiment is then for upgrading EDID when changing video and audio output device.In the present embodiment, as shown in Fig. 5 and Fig. 8, image source V1 is according to the first display information be stored in the first memory module 123, that is EDID information, provides corresponding picture to video and audio output device D1 and D2, and through T0 after a while.When video and audio output device D2 is replaced with D3, first the EDID of video and audio output device D3 first controlled unit 11 can read to inner memory, now control unit 11 can according to the pattern of EDID renewal, and such as automatic mode or particular port pattern, judge.Be example in automatic mode, when the EDID information of video and audio output device D3 is read to the memory 110 in control unit 11, the EDID that video and audio output device D1 and the D3 that control unit 11 can go out picture as required has determines the EDID an of the best, in order to go out the foundation of picture as image source V1.After determining best EDID, be referred to as with the second display information below, step S5 can be carried out, this control unit 11 and the second memory module 124 are electrically connected by the first switch unit 121 in the display information switch module 12 of corresponding image source V1, this control unit 11 again by this second display information via the communications protocol of I2C, transfer to this second memory module 124 and store.In the T1 time course stored, image source V1 does not interrupt reading the first display information to the first memory module 123, therefore can continue to go out picture to video and audio output device D1.
Store complete after, carry out step S6, control unit 11 controls a HPD signal and is converted to a low level by a high level, to simulate the state that video and audio output device is disconnected, and between this low period, control this second switch unit 122 and switch this image source V1 and this second memory module 124 is electrically connected, to set up information channel, this high level is returned back to again after being switched to this low level a period of time T2, to simulate video and audio output device by the state connected, as previously mentioned, therefore not to repeat here for control HPD high level and low level principle.Then, this is made to be read this second display information in this second storage module 124 via this DDC information channel by the image source V1 that selects.Through the T3 time, after image source V1 completes this second display information of reading, image source V1 can according to the second display information output image signal read to video and audio output device D1 and D3.As can be seen from Figure 8, when upgrading EDID and showing information, owing to having the switching of first and second switch unit 121 and 122 and the second memory module 124, therefore can in this second display information of storage in the process of this second memory module 124, that is within the time of T1, this image source V1 still can continue the first display information of reading in this first memory module 123 and can not interrupt because write second shows information, and makes video and audio output device D1 can maintain the picture continuing image output source V1.Make that video and audio output device D1's do not go out the picture time, foreshorten to T2+T3 by traditional picture time T1+T2+T3 that do not go out.Be noted that, that the renewal EDID mode changing video and audio output device is described in automatic mode although aforementioned, according to same principle, if when selecting to adopt particular port pattern, when the video and audio output device of this this particular port of renewal, switch upgrades the mode of EDID also as previously mentioned.
Be noted that, in the embodiment of aforesaid renewal EDID, first switch unit 121 and the second switch unit 122, and the controlled condition of unrestricted mutual exclusion, also and the first switch unit 121 not synchronously oppositely switch with the second switch unit 122, but the first switch unit 121 decides with which memory module to be electrically connected according to the control signal of control unit 11.In another embodiment, the control of this first switch unit 121 and the second switch unit 122 can be the control mode of mutual exclusion, that is, when this second switch unit 122 be switched to couple with the second memory module 124 time, first switch unit 121 synchronism switching couples to the first memory module 123, otherwise, when the second switch unit 122 be switched to the first memory module 123 couple time, the first switch unit 121 synchronism switching couples to the second memory module 124.Therefore, can consult shown in Fig. 6, when period at T0, the second switch unit 122 couples with this first memory module 123; Now, this first switch unit 121 and this second memory module 124 couple.Therefore this image source V1 can read via DDC passage the first display information stored in the first memory module 123, and goes out picture to video and audio output device D1 and D2 according to this first display information.When information will be shown with the second display information updating first, such as: during the situation of Fig. 7-8, the second display information can be stored in the second memory module 124 via the first switch unit 121 by the second display information according to step S5 control unit 11.After elapsed time T1 storage is complete, HPD signal between control unit 11 can control image source is pulled to low level, now, control unit together with time control the second switch unit 122 and the second memory module 124 couples, and Synchronization Control first switch unit 121 and the first memory module 123 couple.When low level is after T2 after a while, carry out step S6, the HPD signal between image source V1 is switched to high level by control unit 11, and allows image source V1 read the second display information in this second memory module 124.After have passed through one section of reading time T3, image source V1 goes out picture again to video and audio output device D1 and D2.Similarly, the second display information that stores in step s 5 is in the time of this second display module, image source V1 still can read the first display information be stored in the first memory module 123 smoothly, therefore information is shown in the process of the second memory module 124 in write second, image source V1 can go out picture smoothly, can not interrupt.
Hold, compared to the conventional art of Fig. 1-3, the present embodiment utilizes the switching of display information switch module, upgrades display information in the mode of timesharing, therefore can extend and picture time T1, and when upgrading display information to shorten, video and audio output device does not go out the time of picture.
By the detailed description of above specific embodiment, wish clearly to describe feature of the present invention and spirit, and not with above-mentioned disclosed preferred embodiment, category of the present invention is limited, any those skilled in the art, without departing from the spirit and scope of the present invention, when doing various change and retouching.Therefore, protection scope of the present invention is when being as the criterion of defining with accompanying claim.
Claims (15)
1. an image switch, comprises:
One control unit; And
At least one display information switch module, itself and this control unit is electrically connected, and each display information switch module more comprises:
One first memory module, stores one first display information;
One second memory module;
One first switch unit, selects this first and second memory module one of them and this control unit to be electrically connected; And
One second switch unit, selects to be electrically connected with the first memory module, to transmit this first display information;
Wherein, when this first display information will be upgraded, one second display information is stored in this second memory module by this first switch unit by this control unit, and after storage, the switching of this second switch unit is connected to this second memory module to export this second display information.
2. image switch as claimed in claim 1, it is characterized in that, this first and second switch unit is a simulation switch or a digital switcher.
3. image switch as claimed in claim 1, it is characterized in that, this control unit, after this second display information is stored in this second memory module, controls to return back to this high level again after a hot plug detection pin position is converted to a low level a period of time by a high level.
4. image switch as claimed in claim 3, it is characterized in that, this second switch unit, when this low level, is selected to be electrically connected with this second memory module, and in time returning back to this high level, provide an image source to read this second display information in this second memory module.
5. image switch as claimed in claim 1, is characterized in that, each display information switch module is more connected with an input port, and this input port is in order to receive this first or second display information exported via this second switch unit.
6. image switch as claimed in claim 5, it is characterized in that, this control unit is more coupled with multiple output port, the image information that each output port selects a reception input port wherein to receive according to a switching controls.
7. image switch as claimed in claim 6, it is characterized in that, this second display information in each display information switch module is produced because at least one 3rd display information changed video and audio output device and receive determines by least one output port selecting the output port corresponding with this display information switch module to couple by this control unit.
8. image switch as claimed in claim 7, it is characterized in that, determine in the 3rd display information that this control unit has in the video and audio output device coupled with this at least one output port an optimization show information as this second display information or this control unit directly using change the 3rd display information that has of video and audio output device as this second display information.
9. image switch as claimed in claim 1, is characterized in that, this control unit presets display information as this second display information using one.
10. an image changing method, includes the following step:
The image switch being connected at least one image source and at least one video and audio output device is provided;
At least one video and audio output device is selected to couple with an image source wherein;
By the image source selected to read in this image switch the first display information of storing, to export a signal of video signal according to this first display information to this image switch;
This signal of video signal is exported to the video and audio output device of selection by this image switch;
When showing this first display information of information updating with one second, this second display information first stored, wherein, in the process storing this second display information, this is selected image source not interrupt reading this first display information; And
Store this second display information complete after, make this image source read this second display information.
11. image changing methods as claimed in claim 10, it is characterized in that, this image switch has more one first memory module and one second memory module, this first memory module is in order to store this first display information with before this this first display information of the second display information updating, there is provided this first display information read by the image source selected in this first memory module, this second memory module stores this second display information in order to provide.
12. image changing methods as claimed in claim 11, is characterized in that, more include the following step after this second display information being stored up:
Control a hot plug signal and be converted to a low level by a high level;
In between this low period, switch by one and make to be coupled by the image source selected and this second memory module;
Return back to this high level again after being switched to this low level a period of time, make this be read this second display information in this second storage module by the image source selected.
13. image changing methods as claimed in claim 10, is characterized in that, this second display information is be stored in one in this image switch to preset display information.
14. image changing methods as claimed in claim 10, is characterized in that, this second display information is produced by the following step:
Change by the video and audio output device selected with at least one new video and audio output device;
This second display information is determined according to one the 3rd display information that this at least one new video and audio output device has respectively.
15. image changing methods as claimed in claim 14, it is characterized in that, determine in the 3rd display information that this control unit has in the video and audio output device coupled with this at least one output port an optimization show information as this second display information or this control unit directly using change the 3rd display information that has of video and audio output device as this second display information.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103112353A TWI518673B (en) | 2014-04-02 | 2014-04-02 | Video switch and switching method thereof |
| TW103112353 | 2014-04-02 |
Publications (2)
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Also Published As
| Publication number | Publication date |
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| TW201539424A (en) | 2015-10-16 |
| TWI518673B (en) | 2016-01-21 |
| CN104980666B (en) | 2018-02-27 |
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