CN103365422B - Digital/analog video switching device and method and keyboard/screen/mouse switching device and method - Google Patents
Digital/analog video switching device and method and keyboard/screen/mouse switching device and method Download PDFInfo
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Abstract
A digital/analog video switching device is coupled between at least one digital/analog display card and at least one display device and comprises a connecting interface, a dummy load circuit and a driving module. The connection interface is coupled with the digital/analog display card. The dummy load circuit is coupled to the connection interface and at least one display device. The driving module is coupled between the connection interface and at least one display device and coupled to the dummy load circuit. When the driving module closes the dummy load circuit and generates a hot plug detection signal to the digital/analog display card, the driving module drives the digital/analog display card to output digital video signals to the display equipment; when the drive module starts the dummy load circuit, the drive module drives the digital/analog display card to output analog video signals to the display equipment.
Description
Technical field
The present invention is relevant with video transmission, particularly about a kind of digital/analog video switching device shifter, digital/analog video changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method.
Background technology
In recent years, multimedia video technical development obtains quite rapid.For example, high resolution multimedia interface (the High-DefinitionMultimediaInterface that sound and image transmit together can be integrated, or digital video interface (DigitalVisualInterface HDMI), DVI), due to its by same cable transmission without compression sound signal and there is high-resolution vision signal, do not need to carry out simulating signal and convert the program that digital signal (A/D) or digital signal convert simulating signal (D/A) to, therefore the target of undistorted output can be reached.
The joint of digital video interface (DVI) also can comprise the pin position of conventional analog signal (VGA) except the digital signal pin position comprising DVI prescribed by standard, and this design is that versatility in order to maintain DVI is so that multi-form screen can share same connecting line.Along with the difference of implementation function, DVI joint can be divided into following three types:
(1) DVI-D joint: only can connect digital distance scope and transmit digital video signal.
(2) DVI-A joint: only can connecting analog display device and transmission analog video signal.
(3) DVI-I joint: digital distance scope and analog display device can be connected, and digital video signal and analog video signal can be transmitted.
In practical application, because DVI-I joint is except can transmitting digital video signal to digital distance scope, also analog video signal can be transmitted to traditional analog display device, therefore it uses quite extensive, the DVI-Integrated display card of such as computing machine is connected to DVI digital distance scope and VGA analog display device by the DVI-I tap of Y shape.
But, due at present common on the market DVI-Integrated display card and cannot automatically switch the digital video signal or analog video signal that export DVI digital distance scope or VGA analog display device to, cause user still manually must plug the joint of DVI digital distance scope and VGA analog display device, DVI digital distance scope and VGA analog display device can normally export the picture of specifying, for user, quite inconvenience, also seriously weakens the market competitiveness of DVI-I joint.
Summary of the invention
Therefore, the present invention proposes a kind of digital/analog video switching device shifter, digital/analog video changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method, to solve the above-mentioned variety of problems that prior art suffers from.
A category of the present invention is to propose a kind of digital/analog video switching device shifter.In a specific embodiment, digital/analog video switching device shifter is coupled between at least one digital/analog display card and at least one display device.Digital/analog video switching device shifter comprises connecting interface, fictitious load (dummyload) circuit and driver module.Connecting interface couples digital/analog display card.Dummy load circuit couples connecting interface and at least one display device.Driver module is coupled between connecting interface and at least one display device, and couples dummy load circuit.When driver module is closed dummy load circuit and produced hot plug detection (hotplugdetection) signal to digital/analog display card, driver module drives digital/analog display card to export digital video to display device; When driver module starts dummy load circuit, driver module drives digital/analog display card to export analog video to display device.
Another category of the present invention is to propose a kind of digital/analog video changing method.In a specific embodiment, this digital/analog video changing method is applied between at least one digital/analog display card and at least one display device.This at least one digital/analog display card and this at least one display device couple a dummy load circuit.This digital/analog video changing method at least comprises the following step: when dummy load circuit is closed and produced a hot plug detection signal to digital/analog display card, drive digital/analog display card to export a digital video to display device; When dummy load circuit starts, digital/analog display card is driven to export an analog video to display device.
Another category of the present invention is to propose a kind of keyboard/screen/mouse switching device.In a specific embodiment, keyboard/screen/mouse switching device is coupled between at least one digital/analog display card and at least one display device.Keyboard/screen/mouse switching device comprises connecting interface, dummy load circuit, driver module and handover module.Connecting interface couples digital/analog display card.Dummy load circuit couples connecting interface and at least one display device.Driver module is coupled between connecting interface and at least one display device, and couples dummy load circuit.When driver module closes dummy load circuit when producing hot plug detection signal to digital/analog display card, driver module drives digital/analog display card to export digital video to display device; When driver module starts dummy load circuit, driver module drives digital/analog display card to export analog video to display device.Handover module is coupled to driver module, exports digital video or analog video with selecting a certain digital/analog display card in a plurality of digital/analog display card for user.
Another category of the present invention is to propose a kind of keyboard/screen/mouse switching method.In a specific embodiment, this keyboard/screen/mouse switching method is applied between at least one digital/analog display card and at least one display device.This at least one digital/analog display card and this at least one display device couple a dummy load circuit.This keyboard/screen/mouse switching method at least comprises the following step: user selects a digital/analog display card in this at least one digital/analog display card; When dummy load circuit is closed and produced a hot plug detection signal to digital/analog display card, digital/analog display card is driven to export a digital video to display device; When dummy load circuit starts, digital/analog display card is driven to export an analog video to display device.
Compared to prior art, the present invention can by judging the video signal kind that the kind of display screen inserted or detection display card export, and the simulation mode that again plugs the action of digital display screen reaches the function that automatic switchover digital video signal or analog video signal export DVI digital display screen or VGA simulative display screen to.Therefore, user does not need the joint manually plugging DVI digital display screen and VGA simulative display screen, namely DVI digital display screen and VGA simulative display screen can normally export the picture of specifying, quite facilitate and hommization for user, also significantly improve range of application and the market competitiveness of DVI-I joint.
Can be further understood by following detailed Description Of The Invention and institute's accompanying drawings about the advantages and spirit of the present invention.
Accompanying drawing explanation
Figure 1A ~ Fig. 1 C, Fig. 3 and Fig. 5 illustrate the process flow diagram of the different embodiments of digital/analog video changing method of the present invention respectively.
Fig. 2, Fig. 4 and Fig. 6 illustrate the functional block diagram of the different embodiments of digital/analog video switching device shifter of the present invention respectively.
[main element symbol description]
S10 ~ S92: process step 1,1 ': digital/analog display card
2,2 ', 2 ": digital/analog video switching device shifter
3: simulative display screen 4: digital display screen
PR, PR ', PR ": processor 23,23 ', 23 ": setting module
27,27 ', 27 ": dummy load circuit 20,20 ', 20 ": acquisition module
28,28 ', 28 ": handover module 22,22 ', 22 ": driver module
26,26 ', 26 ": storage module 29,29 ', 29 ": detection module
24,24 ', 24 ": connecting interface K: display screen
Embodiment
The present invention proposes a kind of digital/analog video switching device shifter, digital/analog video changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method, under can being applied to different use situations respectively.For example, under above-mentioned switching device shifter and method can be applied to the use situation of single computing machine (display card) and at least two display screens (comprising digital display screen and simulative display screen) respectively, under the use situation of multicomputer (display card) and single display screen (digital display screen or simulative display screen) or under the use situation of multicomputer (display card) and at least two display screens (comprising digital display screen and simulative display screen).Next, namely above-mentioned switching device shifter under different use situations is just applied to by following different embodiment and method is described in detail.
First preferred embodiment according to the present invention is a kind of digital/analog video changing method.It should be noted that, under the digital/analog video changing method disclosed by this embodiment is applied to the use situation of single computing machine (digital/analog display card) and two display screens, therefore switching action need do not carried out between multiple stage computing machine.Please refer to Figure 1A to Fig. 1 C, Figure 1A to Fig. 1 C illustrates the process flow diagram of this digital/analog video changing method of this embodiment.As shown in Figure 1A, in step S10, digital display screen and simulative display screen all connect by user, and set video signal output order with digital video or analog video for preferentially.In step S12, the method captures the extending display identification data (ExtendedDisplayIdentificationData, EDID) about digital display screen and simulative display screen from digital display screen and simulative display screen respectively.In step S14, after the digital/analog display card of computing machine connects, digital/analog display card will send initial video signal (can be digital video or analog video).In step S16, the initial video signal that the method detection digital/analog display card sends is digital video or analog video.
As shown in Figure 1B, if the initial video signal detected by step S16 is digital video, and the video signal output order set by step S10 is preferential with digital video, the method performs step S18, closes dummy load circuit and produces hot plug detection signal to digital/analog display card.Then, the method performs step S20, drives digital/analog display card to export digital video to digital display screen, for digital display screen display digital video.In addition, the method also can not be done action (not performing step S18 and S20) and terminate after step S16.In fact, hot plug detection signal can be voltage level change (such as becoming high level from low level), but not as limit.
If the initial video signal detected by step S16 is digital video, but the video signal output order set by step S10 is preferential with analog video, and the method performs step S22, starts dummy load circuit.Then, the method performs step S24, drives digital/analog display card to export analog video to simulative display screen, for simulative display screen display simulation video signal.
It should be noted that, step S18 performs to close dummy load circuit and produce hot plug detection signal to the purpose of digital/analog display card and is namely to simulate behavior digital display screen being connected digital/analog display card, and therefore digital/analog display card will export digital video to digital display screen; And namely the purpose that step S22 performs startup dummy load circuit is to simulate behavior simulative display screen being connected digital/analog display card, analog video will recognize fictitious load, and therefore digital/analog display card will export analog video to simulative display screen.
As shown in Figure 1 C, if the initial video signal detected by step S16 is analog video, and the video signal output order set by step S10 is preferential with analog video, and the method performs step S26, starts dummy load circuit.Then, the method performs step S28, drives digital/analog display card to export analog video to simulative display screen, for simulative display screen display simulation video signal.In addition, the method also can not be done action (not performing step S26 and S28) and terminate after step S16.
If the initial video signal detected by step S16 is analog video, but the video signal output order set by step S10 is preferential with digital video, and the method performs step S30, closes dummy load circuit and produces hot plug detection signal to digital/analog display card.Then, the method performs step S32, drives digital/analog display card to export digital video to digital display screen, for digital display screen display digital video.
Schematic diagram as its corresponding digital/analog video switching device shifter 2 then please refer to Fig. 2.As shown in Figure 2, digital/analog video switching device shifter 2 is coupled to the digital/analog display card 1 of computing machine by display card connecting interface 24, and coupled mutually by display screen connecting interface (not shown) and simulative display screen 3 and digital display screen 4, that is under the digital/analog video switching device shifter 2 disclosed by this embodiment is applied to the use situation of single computing machine (digital/analog display card) and two display screens.Wherein, simulative display screen 3 can have VGA specification, digital display screen 4 can have DVI specification, the digital/analog display card 1 of computing machine is DVI-Integrated display card, there is the function exporting digital video and analog video, be such as independent display card or motherboard built-in (onboard) display card etc., and be not limited to the form of card (card).
In this embodiment, digital/analog video switching device shifter 2 includes processor P R, setting module 23, connecting interface 24, dummy load circuit 27, handover module 28 and detection module 29.Wherein, connecting interface 24 is coupled to digital/analog display card 1; Processor P R is coupled to simulative display screen 3, digital display screen 4 and connecting interface 24; Dummy load circuit 27 couples connecting interface 24, simulative display screen 3 and digital display screen 4; Handover module 28 is coupled between connecting interface 24 and simulative display screen 3 and digital display screen 4; Detection module 29 is coupled between connecting interface 24 and processor P R.Processor P R can include the elements such as acquisition module 20, driver module 22, storage module 26, or the elements such as acquisition module 20, driver module 22 and storage module 26 can independently be arranged separately, not as limit, in addition, detection module 29 also can be contained in processor P R.In fact, processor P R can be central processing unit or microcontroller etc.; Storage module 26 can be any pattern storage device, and such as storer, hard disk etc. also can be arranged at outside processor P R; Couple by internal integrated circuit interface between acquisition module 20 and simulative display screen 3 and digital display screen 4, but all not as limit.Dummy load circuit 27 is such as made up of transistor, (on)/closedown (off) dummy load circuit 27 (transistor can be used as a switch at this) can be started to transistor action, in practical application, dummy load circuit 27 can carry on R, G, B signal of video signal, but not as limit.In fact connecting interface 24 can be DVI-I joint, is connected with digital/analog display card 1 by cable.
Because simulative display screen 3 and digital display screen 4 are all coupled to digital/analog video switching device shifter 2 by user, now, namely user sets video transmission order with digital video as preferentially or with analog video as preferential by setting module 23 (such as screen display menu (OSD), Touch Screen (touchpanel) or hot key (hotkey)).
After digital/analog display card 1 is connected to the connecting interface 24 of digital/analog video switching device shifter 2, digital/analog display card 1 will send initial video signal (can be digital video or analog video).Now, detection module 29 will detect by connecting interface 24 the initial video signal that digital/analog display card 1 sends is digital video or analog video.
If detection module 29 detects that the initial video signal that digital/analog display card 1 sends is digital video, but the video signal output order that user passes through set by setting module 23 is preferential with analog video, namely driver module 22 can start dummy load circuit 27, and drives digital/analog display card 1 to export analog video to simulative display screen 3.
If detection module 29 detects that the initial video signal that digital/analog display card 1 sends is analog video, but the video signal output order that user passes through set by setting module 23 is preferential with digital video, namely driver module 22 can close dummy load circuit 27 and produce hot plug detection signal to digital/analog display card 1, exports digital video to digital display screen 4 to drive digital/analog display card 1.
It should be noted that, driver module 22 is closed dummy load circuit 27 and is produced hot plug detection signal to the purpose of digital/analog display card 1 and is namely to simulate behavior digital display screen 4 being connected digital/analog display card 1, and therefore digital/analog display card 1 will export digital video to digital display screen 4; And namely the purpose that driver module 22 starts dummy load circuit 27 is to simulate behavior simulative display screen 3 being connected digital/analog display card 1, analog video will recognize fictitious load, and therefore digital/analog display card 1 will export analog video to simulative display screen 3.
In addition, user selects to receive by simulative display screen 3 or digital display screen 4 the analog or digital video signal that digital/analog display card 1 exports by screen display menu, Touch Screen or the hot key etc. be such as arranged on digital/analog video switching device shifter 2.
In an embodiment, handover module 28 can comprise a display card side ports and two display device side ports (not shown), display card side ports is corresponding or be connected to digital/analog display card 1, two display device side ports are then corresponding or be connected to simulative display screen 3 and digital display screen 4 respectively, optionally can be electrically connected and cut off between display card side ports and two display device side ports.
Handover module 28 selects one of them to receive digital video or analog video according to user between the two in simulative display screen 3 and digital display screen 4, and is electrically connected one of them and the connection cut off between display card side ports and another display device side ports of display card side ports and two display device side ports accordingly.Such as user selects simulative display screen 3 (or digital display screen 4) to receive analog video (or digital video), then handover module 28 is electrically connected display card side ports and the first display device side ports (or second display device side ports) and the connection cut off between display card side ports and the second display device side ports (or first display device side ports).
When the display card side ports corresponding to digital/analog display card 1 is electrically connected with the first display device side ports corresponding to simulative display screen 3, on digital/analog display card 1 and simulative display screen 3 are also electrically connected to each other, and digital/analog display card 1 will transmit video signal to simulative display screen 3.
When the display card side ports corresponding to digital/analog display card 1 is electrically connected with the second display device side ports corresponding to digital display screen 4, on digital/analog display card 1 and digital display screen 4 are also electrically connected to each other, and digital/analog display card 1 will transmit video signal to digital display screen 4.
Further, if virgin state is digital/analog display card 1 export analog video to simulative display screen 3, by simulative display screen 3 display frame, then when user is for changing by digital display screen 4 display frame, the video signal that user makes digital display screen 4 receive digital/analog display card 1 to export by handover module 28 electrical connection switched between display card side ports and two display device side ports, driver module 22 is also selected close dummy load circuit 27 and produce hot plug detection signal to digital/analog display card 1 by according to the switching of user, digital video is exported to digital display screen 4 to drive digital/analog display card 1, and then the corresponding relation changing original video signal output and receive.
If virgin state is digital/analog display card 1 export digital video to digital display screen 4, by digital display screen 4 display frame, then when user is for changing by 3 display frame of simulative display screen, the video signal that user makes simulative display screen 3 receive digital/analog display card 1 to export by handover module 28 electrical connection switched between display card side ports and display device side ports, driver module 22 is also selected to start dummy load circuit 27 by according to the switching of user, analog video is exported to simulative display screen 3 to drive digital/analog display card 1, and then the corresponding relation changing original video signal output and receive.
Storage module 26 is for the extending display identification data acquired by storage retrieval module 20, following digital/simulative display card 1 can capture extending display identification data to storage module 26, understands the video signal that the data such as the resolution of display screen export to adjust it for it.
Second preferred embodiment according to the present invention is a kind of digital/analog video changing method.It should be noted that, under the digital/analog video changing method disclosed by this embodiment is applied to the use situation of multiple stage computing machine (digital/analog display card) and single display screen, therefore switching action can be carried out between multiple stage computing machine.Therefore, this embodiment also can be applicable to, in a kind of keyboard/screen/mouse switching method proposed by the invention, not repeat separately.Please refer to Fig. 3, Fig. 3 illustrates the process flow diagram of this digital/analog video changing method of this embodiment.
As shown in Figure 3, first, in step S40, single display screen connects by user.Then, in step S42, the method is from the extending display identification data of single display screen acquisition about this display screen.Then, the method performs step S50, and user switches between multiple stage computing machine.When user switches to the digital/analog display card of certain computing machine (user selects the digital simulation display card of this certain computing machine to export video signal), the method performs step S52, and the initial video signal that the digital/analog display card detecting this computing machine exports is digital video or analog video.
If the initial video signal that the digital/analog display card that the testing result of step S52 is this computing machine exports is analog video, and what connect is digital display screen, the method performs step S54, closes dummy load circuit and produces a hot plug detection signal to digital/analog display card.Afterwards, the method performs step S56, drives digital/analog display card to export digital video to digital display screen, for digital display screen display digital video.
On the other hand, if the initial video signal that the digital/analog display card that the testing result of step S52 is this computing machine exports is digital video, and what connect is simulative display screen, the method performs step S58, starts dummy load circuit.Then, the method performs step S60, drives digital/analog display card to export analog video to simulative display screen, for simulative display screen display simulation video signal.
In like manner, when user switches to the digital/analog display card of other computing machines, the method also can re-execute above-mentioned steps S52 ~ S60 to the digital/analog display card of other computing machines, to reach effect that digital/analog video switches, does not repeat separately in this.
Schematic diagram as its corresponding digital/analog video switching device shifter 2 ' please refer to Fig. 4.It should be noted that, under digital/analog video switching device shifter 2 ' disclosed by this embodiment is applied to the use situation of multiple stage computing machine (digital/analog display card) and single display screen, therefore digital/analog video switching device shifter 2 ' can carry out switching action between multiple stage computing machine.User selects a certain digital/analog display card to export digital video or analog video by digital/analog video switching device shifter 2 ' in a plurality of digital/analog display card.Therefore, this embodiment also can be applicable to, in a kind of keyboard/screen/mouse switching device proposed by the invention, not repeat separately.
In this embodiment, digital/analog video switching device shifter 2 ' includes processor P R ', setting module 23 ', connecting interface 24 ', dummy load circuit 27 ', handover module 28 ' and detection module 29 '.Wherein, connecting interface 24 ' is coupled to digital/analog display card 1 and digital/analog display card 1 '; Processor P R ' is coupled to display screen K and connecting interface 24 '; Dummy load circuit 27 ' couples connecting interface 24 ' and display screen K; Handover module 28 ' is coupled between connecting interface 24 ' and display screen K; Detection module 29 ' is coupled between connecting interface 24 ' and processor P R '.Processor P R ' can include the elements such as acquisition module 20 ', driver module 22 ', storage module 26 ', or the elements such as acquisition module 20 ', driver module 22 ' and storage module 26 ' can independently be arranged separately, not as limit, in addition, detection module 29 ' also can be contained in processor P R '.In fact, processor P R ' can be central processing unit or microcontroller etc.; Storage module 26 ' can be any pattern storage device, and such as storer, hard disk etc. also can be arranged at outside processor P R '; Couple by internal integrated circuit interface between acquisition module 20 ' and display screen K, but all not as limit.Dummy load circuit 27 ' is such as made up of transistor, (on)/closedown (off) dummy load circuit 27 ' (transistor can be used as a switch at this) can be started to transistor action, in practical application, dummy load circuit 27 ' can carry on R, G, B signal of video signal, but not as limit.Connecting interface 24 ' in fact can be DVI-I joint, is connected with display card by cable.Digital/analog display card 1 and 1 ' is then DVI-Integrated display card, there is the function exporting digital video and analog video, be such as independent display card or motherboard built-in (onboard) display card etc., and be not limited to the form of card (card).
As shown in Figure 4, suppose that user connects single display screen K to digital/analog video switching device shifter 2 ', acquisition module 20 ' will capture about the extending display identification data of single display screen K, to distinguish that single display screen K is for digital display screen or simulative display screen from single display screen K.When user switches to the digital/analog display card 1 ' of second computer by the handover module 28 ' of digital/analog video switching device shifter 2 ' from the digital/analog display card 1 of the first computing machine, the initial video signal that the digital/analog display card 1 ' that detection module 29 ' will detect second computer exports is digital video or analog video.
If detection module 29 ' detects that the initial video signal that the digital/analog display card 1 ' of second computer exports is analog video, and the single display screen K being connected to digital/analog video switching device shifter 2 ' is digital display screen, driver module 22 ' will be closed dummy load circuit and be produced hot plug detection signal to digital/analog display card 1 ', exports digital video to digital display screen K to drive the digital/analog display card 1 ' of second computer.
If detection module 29 ' detects that the initial video signal that the digital/analog display card 1 ' of second computer exports is digital video, but the single display screen K being connected to digital/analog video switching device shifter 2 ' is simulative display screen, driver module 22 ' will start dummy load circuit 27 ' and drive the digital/analog display card 1 ' of second computer to export analog video to simulative display screen K.
User also sets driver module 22 ' by setting module 23 ' and drives digital/analog display card 1 and 1 ' to export numeral or analog video, but, if display screen K is digital display screen, user sets digital/analog display card 1 or 1 by setting module 23 ' ' export analog video, driver module 22 ' will ignore the setting value inputted by setting module 23 ', and close dummy load circuit 27 ' and produce hot plug detection signal to digital/analog display card 1 or 1 ', to drive the digital/analog display card 1 or 1 of second computer ' export digital video to digital display screen K, if display screen K is simulative display screen, user sets digital/analog display card 1 or 1 by setting module 23 ' ' export digital video, driver module 22 ' will ignore the setting value inputted by setting module 23 ', and startup dummy load circuit, to drive the digital/analog display card 1 or 1 of second computer ' export analog video to simulative display screen K.
In practical application, because digital/analog video switching device shifter of the present invention can be arranged in keyboard/screen/mouse switch (KVM), and digital/analog display card 1 can be arranged at keyboard/screen/mouse switch to couple and in certain managed computer controlled.
3rd preferred embodiment according to the present invention is a kind of digital/analog video changing method.It should be noted that, under the digital/analog video changing method disclosed by this embodiment is applied to the use situation of multiple stage computing machine (digital/analog display card) and two display screens, therefore switching action can be carried out between multiple stage computing machine and double screen.Therefore, this embodiment also can be applicable to, in a kind of keyboard/screen/mouse switching method proposed by the invention, not repeat separately in this.
Please refer to Fig. 5, Fig. 5 illustrates the process flow diagram of this digital/analog video changing method of this embodiment.As shown in Figure 5, first, in step S80, digital display screen and simulative display screen all connect by user.Then, in step S82, the method can capture the extending display identification data about digital display screen and simulative display screen from digital display screen and simulative display screen respectively.
In step S84, user is preset by the digital/analog display card of setting first computing machines such as screen display menu, Touch Screen or hot key and exports analog video and the digital/analog display card of second computer default output digital video.In fact, the digital/analog display card that user also sets the first computing machine by screen display menu or hot key presets output digital video and the digital/analog display card of second computer default output analog video, or all export digital video, or all export analog video, there is no specific restriction.
Then, in step S86, when user switches to the digital/analog display card presetting the first computing machine exporting analog video, the method starts dummy load circuit.Then, in step S88, the method drives the digital/analog display card of the first computing machine to export analog video to simulative display screen.
In step S90, when user is switched to the digital/analog display card being preset as the second computer exporting digital video by the first computing machine, the method is closed dummy load circuit and is produced the digital/analog display card of hot plug detection signal to second computer.Then, in step S92, the method drives the digital/analog display card of second computer to export digital video.
In like manner, when user switches to the digital/analog display card of other computing machines, the method also can re-execute above-mentioned steps S86 ~ S92 to the digital/analog display card of other computing machines, to reach effect that digital/analog video switches, does not repeat separately in this.In fact, the method also first by the digital/analog display card of second computer, then can switch to the digital/analog display card of the first computing machine, also without specific restriction.
As for the digital/analog video switching device shifter 2 that it is corresponding " schematic diagram then please refer to Fig. 6.The digital/analog video switching device shifter 2 of this embodiment " also can be applicable to, in a kind of keyboard/screen/mouse switching device proposed by the invention, not repeat separately in this.As shown in Figure 6, digital/analog video switching device shifter 2 " be coupled between the digital/analog display card 1 of the first computing machine and the digital/analog display card 1 ' of second computer and simulative display screen 3 and digital display screen 4, that is the digital/analog video switching device shifter 2 disclosed by this embodiment " be applied to the use situation of multiple stage computing machine (digital/analog display card) and two display screens under, therefore digital/analog video switching device shifter 2 " switching action can be carried out between multiple stage computing machine (digital/analog display card) and two display screens, this enforcement profit digital/analog video switching device shifter 2 " also can be applicable to the use situation of multiple stage computing machine (digital/analog display card) and multi-display curtain (comprising numeral and simulative display screen) under.Wherein, simulative display screen 3 can have VGA specification, digital display screen 4 can have DVI specification, the digital/analog display card 1 of the first computing machine and the digital/analog display card 1 ' of second computer are then DVI-Integrated display card, there is the function exporting digital video and analog video, be such as independent display card or the built-in display card of motherboard etc., and be not limited to the form of card.
In this embodiment, digital/analog video switching device shifter 2 " include processor P R ", setting module 23 ", connecting interface 24 ", dummy load circuit 27 ", handover module 28 " and detection module 29 ".Wherein, connecting interface 24 " be coupled to digital/analog display card 1 and 1 '; Processor P R " be coupled to simulative display screen 3, digital display screen 4 and connecting interface 24 "; Dummy load circuit 27 " couple connecting interface 24 ", simulative display screen 3 and digital display screen 4; Handover module 28 " be coupled to simulative display screen 3, digital display screen 4 and connecting interface 24 " between.Processor P R " acquisition module 20 can be included ", driver module 22 " and storage module 26 " etc. element, or acquisition module 20 ", driver module 22 " and storage module 26 " etc. element can independently arrange separately, but not as limit.Detection module 29 " also can be arranged at processor P R " in.In fact, processor P R " can be central processing unit or microcontroller etc.; Storage module 26 " can be any pattern storage device, such as storer, hard disk etc., also can be arranged at processor P R " outside; Acquisition module 20 " and digital display screen 4 between couple by internal integrated circuit interface, but all not as limit.Dummy load circuit 27 " be such as made up of transistor; (on)/closedown (off) dummy load circuit 27 can be started to transistor action " (transistor can be used as a switch at this), in practical application, dummy load circuit 27 " can carry on R, G, B signal of video signal, but not as limit.Connecting interface 24 " in fact can be DVI-I joint, be connected with display card by cable.
Because simulative display screen 3 and digital display screen 4 are all coupled to digital/analog video switching device shifter 2 by user ", acquisition module 20 " the extending display identification data about simulative display screen 3 and digital display screen 4 will be captured from simulative display screen 3 and digital display screen 4 respectively.Now, user is by setting module 23 " (such as screen display menu, Touch Screen or hot key) video transmission order of setting the digital/analog display card 1 of the first computing machine and the digital/analog display card 1 ' of second computer with digital video for preferential or with analog video as preferentially.
In this embodiment, suppose that the digital/analog display card 1 of the first computing machine is set as being transmitted as preferentially with analog video and the digital/analog display card 1 ' of second computer is set as being transmitted as preferentially with digital video.In fact, the digital/analog display card 1 that also can set the first computing machine is transmitted as the preferential and digital/analog display card 1 ' of second computer with digital video and is transmitted as preferentially with analog video, there is no specific restriction.If digital/analog video switching device shifter 2 " what first connect is the digital/analog display card 1 of the first computing machine; because the digital/analog display card 1 of the first computing machine is transmitted as preferentially with analog video; therefore; driver module 22 " dummy load circuit 27 will be started " and drive the digital/analog display card 1 of the first computing machine to export analog video to simulative display screen 3, for simulative display screen 3 display simulation video signal.
Then, if user is by the handover module 28 of digital/analog video switching device shifter 2 ' " digital/analog display card 1 ' of second computer is switched to from the digital/analog display card 1 of the first computing machine, because the digital/analog display card 1 ' of second computer is transmitted as preferentially with digital video, therefore, driver module 22 " dummy load circuit 27 will be closed " and produce the digital/analog display card 1 ' of a hot plug detection signal to second computer, digital video is exported to digital display screen 4 to drive the digital/analog display card 1 ' of second computer, digital video is shown for digital display screen 4.As for when user is by the handover module 28 of digital/analog video switching device shifter 2 ' " when switching to the digital/analog display card 1 of the first computing machine from the digital/analog display card 1 ' of second computer; the wherein operation situation of digital/analog video switching device shifter 2 '; can be known by inference by above-mentioned, not repeat separately in this.
Further, if originally export digital video to digital display screen 4 by the digital/analog display card 1 of the first computing machine, then, user is by handover module 28 " switch to simulative display screen 3 by digital display screen 4, namely user changes by digital display screen 4 originally the video signal that the digital/analog display card 1 of selecting simulative display screen 3 to receive the first computing machine exports into, handover module 28 " be electrically connected digital/analog display card 1 and simulative display screen 3 according to the selection of user, then, driver module 22 " start dummy load circuit 27 " to drive digital/analog display card 1 to export analog video to simulative display screen 3.
If originally export analog video to simulative display screen 3 by the digital/analog display card 1 ' of second computer, then, user is by handover module 28 " switch to digital display screen 4 by simulative display screen 3, namely user is changed into the video signal selecting digital display screen 4 to receive digital/analog display card 1 ' to export by simulative display screen 3 originally, handover module 28 " be electrically connected digital/analog display card 1 ' and digital display screen 4 according to the selection of user, then driver module 22 " close dummy load circuit 27 " and produce hot plug detection signal to digital/analog display card 1 ', digital video is exported to digital display screen 4 to drive digital/analog display card 1 '.
User is by handover module 28 " when switching, also can switch digital/analog display card and display screen simultaneously, in an embodiment, if originally export digital video to digital display screen 4 by the digital/analog display card 1 ' of second computer, then, user is by handover module 28 " switch to simulative display screen 3 by digital display screen 4, switched to the digital/analog display card 1 of the first computing machine by the digital/analog display card 1 ' of second computer simultaneously, handover module 28 " selection according to user is electrically connected digital/analog display card 1 and simulative display screen 3 and the electric connection cut off between digital/analog display card 1 ' and digital display screen 4, then driver module 22 " start dummy load circuit 27 " and drive digital/analog display card 1 to export analog video to simulative display screen 3.In fact and be not limited to above handoff relation, also can combination in any switch between different digital/simulative display card and numeral and simulative display screen, its switching mode also can be known by inference by foregoing, does not repeat separately in this.
Compared to prior art, can by judging the kind of the display screen inserted according to digital/analog video switching device shifter of the present invention and method, according to the video signal kind that setting or the detection display card of user export, and the simulation mode that again plugs the action of digital display screen reaches and switches the function that digital video signal or analog video signal export DVI digital display screen or VGA simulative display screen to, user does not need the joint manually plugging DVI digital display screen and VGA simulative display screen, namely DVI digital display screen and VGA simulative display screen can normally export the picture of specifying, quite facilitate and hommization for user, also range of application and the market competitiveness of DVI-I joint is significantly improved.
By the above detailed description of preferred embodiments, it is desirable to 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.On the contrary, its objective is wish to contain various change and tool equality be arranged in the present invention institute in the category of claim applied for.
Claims (28)
1. a digital/analog video switching device shifter, is coupled between at least one digital/analog display card and at least one display device, and this digital/analog video switching device shifter at least comprises:
One connecting interface, couples this digital/analog display card;
One dummy load circuit, couples this connecting interface and this at least one display device; And
One driver module, be coupled between this connecting interface and this at least one display device, and couple this dummy load circuit, when this driver module is closed this dummy load circuit and is produced a hot plug detection signal to this digital/analog display card, one digital distance scope is connected the behavior of this digital/analog display card by simulation, and this driver module drives this digital/analog display card to export a digital video to this display device; When this driver module starts this dummy load circuit, simulate a behavior analog display device being connected this digital/analog display card, this driver module drives this digital/analog display card to export an analog video to this display device.
2. digital/analog video switching device shifter as claimed in claim 1, is characterized in that, comprise further:
One acquisition module, is coupled to this driver module, in order to from the Identification display information of this display device acquisition about this display device, to judge that this display device is a digital distance scope or an analog display device.
3. digital/analog video switching device shifter as claimed in claim 1, it is characterized in that, this driver module is described digital distance scope or described analog display device according to this display device, and drives this digital/analog display card to export this digital video or this analog video accordingly.
4. digital/analog video switching device shifter as claimed in claim 1, is characterized in that, comprise further:
One handover module, be coupled between this connecting interface and this display device, this handover module selects this digital/analog display card to export this digital video or this analog video according to user in this at least one digital/analog display card, and connects this selected digital/analog display card and this display device accordingly.
5. digital/analog video switching device shifter as claimed in claim 4, it is characterized in that, this driver module is described digital distance scope or described analog display device according to this display device, and drives this digital/analog display card selected by user to export this digital video or this analog video accordingly.
6. digital/analog video switching device shifter as claimed in claim 1, is characterized in that, comprise further:
One handover module, be coupled between this connecting interface and this display device, this handover module selects this display device to receive this digital video or this analog video according to user in this at least one display device, and connects this selected display device and this digital/analog display card accordingly.
7. digital/analog video switching device shifter as claimed in claim 6, it is characterized in that, when this display device selected by user be described digital distance scope or described analog display device time, this driver module drives this digital/analog display card to export this digital video or this analog video accordingly.
8. digital/analog video switching device shifter as claimed in claim 1, is characterized in that, comprise further:
One setting module, is coupled to this driver module, drives this digital/analog display card to export the video signal of this display device to as this digital video or this analog video with setting this driver module for user.
9. digital/analog video switching device shifter as claimed in claim 8, it is characterized in that, this digital/analog display card is driven to export this digital video or this analog video if user sets, and to should display device be described analog display device or described digital distance scope, then this driver module drives this digital/analog display card correspondence to export this analog video or this digital video.
10. digital/analog video switching device shifter as claimed in claim 1, is characterized in that, comprise further:
One detection module, be coupled to this driver module and this connecting interface, in order to detect this digital/analog display card initial institute exporter for this digital video or this analog video, if person detected by this detection module is this digital video or this analog video, and to should display device be an analog display device or a digital distance scope, then this driver module drives this digital/analog display card to export this analog video or this digital video accordingly.
11. 1 kinds of digital/analog video changing methods, are applied between at least one digital/analog display card and at least one display device, and this at least one digital/analog display card and this at least one display device couple a dummy load circuit, and the method at least comprises the following step:
From the Identification display information of this display device acquisition about this display device, to judge that this display device is a digital distance scope or an analog display device;
When this dummy load circuit is closed and this digital/analog display card receives a hot plug detection signal, simulate the behavior this digital distance scope being connected this digital/analog display card, drive this digital/analog display card to export a digital video to this display device; And
When this dummy load circuit starts, simulate the behavior this analog display device being connected this digital/analog display card, drive this digital/analog display card to export an analog video to this display device.
12. digital/analog video changing methods as claimed in claim 11, is characterized in that, comprise the following step further:
User selects this digital/analog display card to export this digital video or this analog video in this at least one digital/analog display card.
13. digital/analog video changing methods as claimed in claim 12, is characterized in that, comprise the following step further:
Be this digital distance scope or this analog display device according to this display device, drive this digital/analog display card selected by user to export this digital video or this analog video accordingly.
14. digital/analog video changing methods as claimed in claim 11, is characterized in that, comprise the following step further:
User selects this display device to receive this digital video or this analog video in this at least one display device; And
When this display device selected by user be this digital distance scope or this analog display device time, drive this digital/analog display card to export this digital video or this analog video accordingly.
15. digital/analog video changing methods as claimed in claim 11, is characterized in that, comprise the following step further:
User sets this digital/analog display card and exports the video signal of this display device to as this digital video or this analog video; And
This digital/analog display card is driven to export this digital video or this analog video if user sets, and to should display device be this analog display device or this digital distance scope time, then drive this digital/analog display card to export this analog video or this digital video accordingly.
16. digital/analog video changing methods as claimed in claim 11, is characterized in that, comprise the following step further:
Detect this digital/analog display card initial institute exporter for this digital video or this analog video; And
If what detect is this digital video or this analog video, and to should display device be this analog display device or this digital distance scope time, then drive this digital/analog display card to export this analog video or this digital video accordingly.
17. 1 kinds of keyboard/screen/mouse switching devices, are coupled between at least one digital/analog display card and at least one display device, and this keyboard/screen/mouse switching device at least comprises:
One connecting interface, couples this at least one digital/analog display card;
One dummy load circuit, couples this connecting interface and this at least one display device;
One handover module, couple this connecting interface and this at least one display device, this handover module is selected this digital/analog display card according to user and is exported digital video or analog video in this at least one digital/analog display card, and connects this selected digital/analog display card and this display device accordingly; And
One driver module, couple between this dummy load circuit and this at least one display device, when this driver module is closed this dummy load circuit and is produced this digital/analog display card selected by a hot plug detection signal to user, one digital distance scope is connected the behavior of this digital/analog display card by simulation, and this driver module drives this digital/analog display card selected by user to export this digital video to this display device; When this driver module starts this dummy load circuit, simulate a behavior analog display device being connected this digital/analog display card, this driver module drives this digital/analog display card selected by user to export this analog video to this display device.
18. keyboard/screen/mouse switching devices as claimed in claim 17, is characterized in that, comprise further:
One acquisition module, is coupled to this driver module, in order to from the Identification display information of this display device acquisition about this display device, to judge that this display device is a digital distance scope or an analog display device.
19. keyboard/screen/mouse switching devices as claimed in claim 17, it is characterized in that, this driver module is described digital distance scope or described analog display device according to this display device, drives this digital/analog display card selected by user to export this digital video or this analog video accordingly.
20. keyboard/screen/mouse switching devices as claimed in claim 17, it is characterized in that, this handover module more receives this digital video or this analog video in order to select this display device according to user in this at least one display device, and connect this selected display device and this selected digital/analog display card accordingly, wherein when this display device selected by user be a digital distance scope or an analog display device time, this driver module drives this digital/analog display card selected by user to export this digital video or this analog video accordingly.
21. keyboard/screen/mouse switching devices as claimed in claim 17, is characterized in that, comprise further:
One setting module, be coupled to this driver module, this digital/analog display card selected by user is driven to export the video signal of this display device to as this digital video or this analog video with setting this driver module for user, this digital/analog display card selected by user is driven to export this digital video or this analog video if user sets, and to should display device be described analog display device or described digital distance scope time, then this driver module drives this digital/analog display card selected by user to export this analog video or this digital video accordingly.
22. keyboard/screen/mouse switching devices as claimed in claim 17, is characterized in that, comprise further:
One detection module, be coupled to this driver module, in order to detect this digital/analog display card initial institute exporter for this digital video or this analog video, if person detected by this detection module is this digital video or this analog video, and to should display device be an analog display device or a digital distance scope, then this driver module drives this digital/analog display card to export this analog video or this digital video accordingly.
23. 1 kinds of keyboard/screen/mouse switching methods, be applied between at least one digital/analog display card and at least one display device, this at least one digital/analog display card and this at least one display device couple a dummy load circuit, and the method at least comprises the following step:
User selects a digital/analog display card in this at least one digital/analog display card;
When this dummy load circuit close and user selected by this digital/analog display card receive a hot plug detection signal time, one digital distance scope is connected the behavior of this digital/analog display card by simulation, drives this digital/analog display card selected by user to export a digital video to this display device; And
When this dummy load circuit starts, simulate a behavior analog display device being connected this digital/analog display card, drive this digital/analog display card selected by user to export an analog video to this display device.
24. keyboard/screen/mouse switching methods as claimed in claim 23, is characterized in that, comprise the following step further:
From the Identification display information of this display device acquisition about this display device, to judge that this display device is described digital distance scope or described analog display device.
25. keyboard/screen/mouse switching methods as claimed in claim 23, is characterized in that, comprise the following step further:
Be described digital distance scope or described analog display device according to this display device, drive this digital/analog display card selected by user to export this digital video or this analog video accordingly.
26. keyboard/screen/mouse switching methods as claimed in claim 23, is characterized in that, comprise the following step further:
User selects this display device and receives this digital video or this analog video in this at least one display device; And
When this display device selected by user be described digital distance scope or described analog display device time, drive this digital/analog display card selected by user to export this digital video or this analog video accordingly.
27. keyboard/screen/mouse switching methods as claimed in claim 23, is characterized in that, comprise the following step further:
User sets and drives this digital/analog display card selected by user to export the video signal of this display device to as this digital video or this analog video; And
This digital/analog display card selected by user is driven to export this digital video or this analog video if user sets, and to should display device be described analog display device or described digital distance scope time, then drive this digital/analog display card selected by user to export this analog video or this digital video accordingly.
28. keyboard/screen/mouse switching methods as claimed in claim 23, is characterized in that, comprise the following step further:
Detect this digital/analog display card initial institute exporter for this digital video or this analog video; And
If what detect is this digital video or this analog video, and to should display device be described analog display device or described digital distance scope time, then drive this digital/analog display card selected by user to export this analog video or this digital video accordingly.
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| TW101111481 | 2012-03-30 | ||
| TW101111481A TWI447671B (en) | 2012-03-30 | 2012-03-30 | Apparatus and method of switching digital/analog video signal and apparatus and method of switching keyboard/monitor/mouse |
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| TWI565162B (en) * | 2015-07-20 | 2017-01-01 | 晨星半導體股份有限公司 | Control circuit and associated control method applied to a digital visual interface |
| CN106470324A (en) * | 2015-08-20 | 2017-03-01 | 晨星半导体股份有限公司 | It is applied to the control circuit of digital visual interface and the control method of correlation |
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| CN103365422A (en) | 2013-10-23 |
| TWI447671B (en) | 2014-08-01 |
| TW201340031A (en) | 2013-10-01 |
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