CN103365422A - 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-to-analog video signal switching device shifter, digital-to-analog video signal changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method.
Background technology
In recent years, the multimedia video technical development gets quite rapid.For example, can integrate high resolution multimedia interface (the High-Definition Multimedia Interface that sound and image transmit together, HDMI) or digital video interface (Digital Visual Interface, DVI), since its by same cable transmission without the compression sound signal and have high-resolution vision signal, need not carry out analog signal conversion and become digital signal (A/D) or digital signal to convert the program of simulating signal (D/A) to, therefore can reach the target of undistorted output.
The joint of digital video interface (DVI) also can comprise the pin position of traditional analog signal (VGA) except the digital signal pin position that comprises the DVI prescribed by standard, this design is so that multi-form screen can share the same connecting line for the versatility of keeping DVI.Along with the difference of implementation function, the DVI joint can be divided into following three types:
(1) DVI-D joint: only can connect digital distance scope and transmit the digital video signal.
(2) DVI-A joint: only can connecting analog display device and transmission analog video signal.
(3) DVI-I joint: can connect digital distance scope and analog display device, and can transmit digital video signal and analog video signal.
In practical application, because the DVI-I joint is except transmitting the digital video signal to digital distance scope, also can transmit the analog video signal to traditional analog display device, therefore it uses quite extensively, for example the DVI-Integrated display card of computing machine can be connected to by the DVI-I tap of Y shape DVI digital distance scope and VGA analog display device.
Yet, because at present on the market common DVI-Integrated display card and digital video signal or the analog video signal that can't automatically switch and export DVI digital distance scope or VGA analog display device to, cause the user still must pass through manually to plug the joint of DVI digital distance scope and VGA analog display device, DVI digital distance scope and VGA analog display device can normally be exported the picture of appointment, quite inconvenience has also seriously weakened the market competitiveness of DVI-I joint for the user.
Summary of the invention
Therefore, the present invention proposes a kind of digital-to-analog video signal switching device shifter, digital-to-analog video signal changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method, to solve the above-mentioned variety of problems that prior art was suffered from.
A category of the present invention is to propose a kind of digital-to-analog video signal switching device shifter.In a specific embodiment, digital-to-analog video signal switching device shifter is coupled between at least one digital-to-analog display card and at least one display device.Digital-to-analog video signal switching device shifter comprises connecting interface, fictitious load (dummy load) circuit and driver module.Connecting interface couples the digital-to-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 was closed dummy load circuit and produce hot plug detection (hot plug detection) signal to the digital-to-analog display card, driver module drove digital-to-analog display card output digital video to display device; When driver module started dummy load circuit, driver module drove digital-to-analog display card output analog video to display device.
Another category of the present invention is to propose a kind of digital-to-analog video signal changing method.In a specific embodiment, this digital-to-analog video signal changing method is applied between at least one digital-to-analog display card and at least one display device.This at least one digital-to-analog display card and this at least one display device couple a dummy load circuit.This digital-to-analog video signal changing method comprises the following step at least: when a hot plug detection signal is closed and produced to dummy load circuit to the digital-to-analog display card, drive the digital-to-analog display card and export a digital video to display device; When dummy load circuit starts, drive the digital-to-analog display card and 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-to-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 the digital-to-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 was closed dummy load circuit and produce the hot plug detection signal to the digital-to-analog display card, driver module drove digital-to-analog display card output digital video to display device; When driver module started dummy load circuit, driver module drove digital-to-analog display card output analog video to display device.Handover module is coupled to driver module, uses for the user and select a certain digital-to-analog display card output digital video or analog video in a plurality of digital-to-analog display cards.
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-to-analog display card and at least one display device.This at least one digital-to-analog display card and this at least one display device couple a dummy load circuit.This keyboard/screen/mouse switching method comprises the following step at least: the user selects a digital-to-analog display card in this at least one digital-to-analog display card; When a hot plug detection signal is closed and produced to dummy load circuit to the digital-to-analog display card, drive the digital-to-analog display card and export a digital video to display device; When dummy load circuit starts, drive the digital-to-analog display card and export an analog video to display device.
Compared to prior art, the present invention can be by the kind of the display screen that judge to insert or the video signal kind that the detection display card is exported, 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 simulating display screen curtain to.Therefore, the user need be by manually not plugging the joint of DVI digital display screen and VGA simulating display screen curtain, DVI digital display screen and VGA simulating display screen curtain namely can normally be exported the picture of appointment, suitable convenience and hommization for the user have also significantly promoted range of application and the market competitiveness of DVI-I joint.
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Description of drawings
Figure 1A ~ Fig. 1 C, Fig. 3 and Fig. 5 illustrate respectively the process flow diagram of the different embodiment of digital-to-analog video signal changing method of the present invention.
Fig. 2, Fig. 4 and Fig. 6 illustrate respectively the functional block diagram of the different embodiment of digital-to-analog video signal switching device shifter of the present invention.
[main element symbol description]
S10 ~ S92: process step 1,1 ': digital-to-analog display card
2,2 ', 2 ": digital-to-analog video signal switching device shifter
3: simulating display screen curtain 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-to-analog video signal switching device shifter, digital-to-analog video signal changing method, keyboard/screen/mouse switching device and keyboard/screen/mouse switching method, can be applied to respectively under the different use situations.For example, above-mentioned switching device shifter and method can be applied to respectively under the use situation of single computing machine (display card) and at least two display screens (comprising digital display screen and simulating display screen curtain), under the use situation of multicomputer (display card) and single display screen (digital display screen or simulating display screen curtain) or under the use situation of multicomputer (display card) and at least two display screens (comprising digital display screen and simulating display screen curtain).Next, the above-mentioned switching device shifter and the method that namely just are applied under the different use situations by following different embodiment are elaborated.
The first preferred embodiment according to the present invention is a kind of digital-to-analog video signal changing method.It should be noted that, the disclosed digital-to-analog video signal of this embodiment changing method is applied under the use situation of single computing machine (digital-to-analog display card) and two display screens, therefore do not need to carry out change action between many computing machines.Please refer to Figure 1A to Fig. 1 C, Figure 1A to Fig. 1 C illustrates the process flow diagram of this digital-to-analog video signal changing method of this embodiment.Shown in Figure 1A, in step S10, the user all connects digital display screen and simulating display screen curtain, and set video signal output order take digital video or analog video for preferentially.In step S12, the method is respectively from the extending display identification data (Extended Display Identification Data, EDID) of digital display screen and simulating display screen curtain acquisition about digital display screen and simulating display screen curtain.In step S14, after the digital-to-analog display card of computing machine connected, the digital-to-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-to-analog display card sends is digital video or analog video.
As shown in Figure 1B, if the detected initial video signal of step S16 is digital video, and the video signal output that step S10 sets order is take digital video as preferential, and the method execution in step S18 closes dummy load circuit and produces the hot plug detection signal to the digital-to-analog display card.Then, the method execution in step S20 drives digital-to-analog display card output digital video to digital display screen, shows digital video for digital display screen.In addition, the method also can not done action (not execution in step S18 and S20) and finish behind step S16.In fact, the hot plug detection signal can be voltage level change (for example becoming high level by low level), but not as limit.
If the detected initial video signal of step S16 is digital video, but the video signal output that step S10 sets order take analog video for preferential, the method execution in step S22, startup dummy load circuit.Then, the method execution in step S24 drives digital-to-analog display card output analog video to the simulating display screen curtain, for simulating display screen curtain display simulation video signal.
It should be noted that, step S18 carries out to close dummy load circuit and to produce hot plug detection signal to the purpose of digital-to-analog display card and namely is to simulate the behavior that digital display screen is connected the digital-to-analog display card, and therefore the digital-to-analog display card will export digital video to digital display screen; And the purpose of step S22 execution startup dummy load circuit namely is to simulate the behavior that the simulating display screen curtain is connected the digital-to-analog display card, and analog video will recognize fictitious load, and therefore the digital-to-analog display card will export analog video to the simulating display screen curtain.
Shown in Fig. 1 C, if the detected initial video signal of step S16 is analog video, and the video signal output order that sets of step S10 take analog video for preferential, the method execution in step S26, startup dummy load circuit.Then, the method execution in step S28 drives digital-to-analog display card output analog video to the simulating display screen curtain, for simulating display screen curtain display simulation video signal.In addition, the method also can not done action (not execution in step S26 and S28) and finish behind step S16.
If the detected initial video signal of step S16 is analog video, but the video signal output that step S10 sets order take digital video for preferentially, the method execution in step S30 closes dummy load circuit and produces the hot plug detection signal to the digital-to-analog display card.Then, the method execution in step S32 drives digital-to-analog display card output digital video to digital display screen, shows digital video for digital display screen.
Schematic diagram as for its corresponding digital-to-analog video signal switching device shifter 2 then please refer to Fig. 2.As shown in Figure 2, digital-to-analog video signal switching device shifter 2 is coupled to the digital-to-analog display card 1 of computing machine by display card connecting interface 24, and couple mutually by display screen connecting interface (not shown) and simulating display screen curtain 3 and digital display screen 4, that is the disclosed digital-to-analog video signal of this embodiment switching device shifter 2 is applied under the use situation of single computing machine (digital-to-analog display card) and two display screens.Wherein, simulating display screen curtain 3 can have the VGA specification, digital display screen 4 can have the DVI specification, 1 of the digital-to-analog display card of computing machine is the DVI-Integrated display card, function with output digital video and analog video, such as being 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-to-analog video signal 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-to-analog display card 1; Processor P R is coupled to simulating display screen curtain 3, digital display screen 4 and connecting interface 24; Dummy load circuit 27 couples connecting interface 24, simulating display screen curtain 3 and digital display screen 4; Handover module 28 is coupled between connecting interface 24 and simulating display screen curtain 3 and the digital display screen 4; Detection module 29 is coupled between connecting interface 24 and the 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 arrange separately, not as limit, in addition, detection module 29 also can be contained in the 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 the processor P R; Can couple by the internal integrated circuit interface between acquisition module 20 and simulating display screen curtain 3 and the digital display screen 4, but all not as limit.Dummy load circuit 27 for example is made of transistor, can start (on)/close (off) dummy load circuit 27 (can be used as a switch to transistor at this) to transistor action, in practical application, but dummy load circuit 27 carries are on R, the G of video signal, B signal, but not as limit.In fact connecting interface 24 can be the DVI-I joint, is connected with digital-to-analog display card 1 by cable.
Because the user all is coupled to digital-to-analog video signal switching device shifter 2 with simulating display screen curtain 3 and digital display screen 4, at this moment, the user can pass through setting module 23 (for example screen display menu (OSD), Touch Screen (touch panel) or hot key (hot key)) set the video transmission order take digital video for preferential or take analog video as preferentially.
Be connected to the connecting interface 24 of digital-to-analog video signal switching device shifter 2 when digital-to-analog display card 1 after, digital-to-analog display card 1 will send initial video signal (can be digital video or analog video).At this moment, will to detect the initial video signal that digital-to-analog display cards 1 send by connecting interface 24 be digital video or analog video to detection module 29.
If it is digital video that detection module 29 detects the initial video signal that digital-to-analog display card 1 sends, but the video signal output that the user sets by setting module 23 order take analog video for preferentially, driver module 22 namely can start dummy load circuit 27, and drives digital-to-analog display card 1 output analog video to simulating display screen curtain 3.
If it is analog video that detection module 29 detects the initial video signal that digital-to-analog display card 1 sends, but the video signal output that the user sets by setting module 23 order take digital video for preferentially, driver module 22 namely can be closed dummy load circuit 27 and be produced the hot plug detection signal to digital-to-analog display card 1, to drive digital-to-analog display card 1 output digital video to digital display screen 4.
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-to-analog display card 1 and namely is to simulate the behavior that digital display screen 4 is connected digital-to-analog display card 1, and therefore digital-to-analog display card 1 will export digital video to digital display screen 4; And the purpose that driver module 22 starts dummy load circuit 27 namely is to simulate the behavior that simulating display screen curtain 3 is connected digital-to-analog display card 1, analog video will recognize fictitious load, and therefore digital-to-analog display card 1 will export analog video to simulating display screen curtain 3.
In addition, the user can be by selecting to receive the analog or digital video signal that digital-to-analog display card 1 is exported by simulating display screen curtain 3 or digital display screen 4 such as screen display menu, Touch Screen or the hot key etc. that are arranged on the digital-to-analog video signal 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), the display card side ports is corresponding or be connected to digital-to-analog display card 1, two display device side ports are then corresponding or be connected to simulating display screen curtain 3 and digital display screen 4 respectively, can optionally be electrically connected and cut off between display card side ports and two display device side ports.
When going up corresponding to the display card side ports of digital-to-analog display card 1 and corresponding to the first display device side ports electric connection of simulating display screen curtain 3, on digital-to-analog display card 1 also is electrically connected to each other with simulating display screen curtain 3, and digital-to-analog display card 1 will transmit video signal to simulating display screen curtain 3.
When going up corresponding to the display card side ports of digital-to-analog display card 1 and corresponding to the second display device side ports electric connection of digital display screen 4, on digital-to-analog display card 1 also is electrically connected to each other with digital display screen 4, and digital-to-analog display card 1 will transmit video signal to digital display screen 4.
Further, if virgin state is that digital-to-analog display card 1 output analog video is to simulating display screen curtain 3, by 3 display frames of simulating display screen curtain, when then the user wants to change by digital display screen 4 display frame, the user is switched electrical connection between display card side ports and two display device side ports so that digital display screen 4 receives the video signal that digital-to-analog display card 1 is exported by handover module 28, driver module 22 also will be selected to close dummy load circuit 27 and produce the hot plug detection signal to digital-to-analog display card 1 according to user's switching, export digital video to digital display screen 4 to drive digital-to-analog display card 1, and then change original video signal output and the corresponding relation that receives.
If virgin state is that digital-to-analog display card 1 output digital video is to digital display screen 4, by digital display screen 4 display frames, when then the user wants to change by 3 display frame of simulating display screen curtain, the user is switched electrical connection between display card side ports and display device side ports so that simulating display screen curtain 3 receives the video signal that digital-to-analog display card 1 is exported by handover module 28, driver module 22 also will select to start dummy load circuit 27 according to user's switching, export analog video to simulating display screen curtain 3 to drive digital-to-analog display card 1, and then change original video signal output and the corresponding relation that receives.
The second preferred embodiment according to the present invention is a kind of digital-to-analog video signal changing method.It should be noted that, the disclosed digital-to-analog video signal of this embodiment changing method is applied under the use situation of many computing machines (digital-to-analog display card) and single display screen, therefore can carry out change action between many computing machines.Therefore, this embodiment also can be applicable to not give unnecessary details separately in a kind of keyboard/screen/mouse switching method proposed by the invention.Please refer to Fig. 3, Fig. 3 illustrates the process flow diagram of this digital-to-analog video signal changing method of this embodiment.
As shown in Figure 3, at first, in step S40, the user connects the single display screen.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 execution in step S50, the user is switched between many computing machines.When the user switches to the digital-to-analog display card of certain computing machine (user selects the digital simulation display card output video signal of this certain computing machine), the method execution in step S52, detecting the initial video signal that the digital-to-analog display card of this computing machine exports is digital video or analog video.
If the initial video signal that the testing result of step S52 is exported for the digital-to-analog display card of this computing machine is analog video, and what connected is digital display screen, the method execution in step S54 closes dummy load circuit and produces a hot plug detection signal to the digital-to-analog display card.Afterwards, the method execution in step S56 drives digital-to-analog display card output digital video to digital display screen, shows digital video for digital display screen.
On the other hand, if the initial video signal that the testing result of step S52 is exported for the digital-to-analog display card of this computing machine is digital video, and what connected is the simulating display screen curtain, the method execution in step S58, startup dummy load circuit.Then, the method execution in step S60 drives digital-to-analog display card output analog video to the simulating display screen curtain, for simulating display screen curtain display simulation video signal.
In like manner, when the user switches to the digital-to-analog display card of other computing machines, the method also can re-execute above-mentioned steps S52 ~ S60 to the digital-to-analog display card of other computing machines, and the effect of switching to reach the digital-to-analog video signal is not given unnecessary details separately in this.
Schematic diagram as for its corresponding digital-to-analog video signal switching device shifter 2 ' please refer to Fig. 4.It should be noted that, the disclosed digital-to-analog video signal of this embodiment switching device shifter 2 ' is applied under the use situation of many computing machines (digital-to-analog display card) and single display screen, therefore digital-to-analog video signal switching device shifter 2 ' can carry out change action between many computing machines.The user can select a certain digital-to-analog display card output digital video or analog video by digital-to-analog video signal switching device shifter 2 ' in a plurality of digital-to-analog display cards.Therefore, this embodiment also can be applicable to not give unnecessary details separately in a kind of keyboard/screen/mouse switching device proposed by the invention.
In this embodiment, digital-to-analog video signal 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-to-analog display card 1 and digital-to-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 the display screen K; Detection module 29 ' is coupled between connecting interface 24 ' and the 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 arrange separately, not as limit, in addition, detection module 29 ' also can be contained in the 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 the processor P R '; Can couple by the internal integrated circuit interface between acquisition module 20 ' and the display screen K, but all not as limit.Dummy load circuit 27 ' for example is made of transistor, can start (on)/close (off) dummy load circuit 27 ' (can be used as a switch to transistor at this) to transistor action, in practical application, but dummy load circuit the 27 ' carry is on R, the G of video signal, B signal, but not as limit.Connecting interface 24 ' in fact can be the DVI-I joint, is connected with display card by cable.Digital-to-analog display card 1 and 1 ' is the DVI-Integrated display card then, has the function of output digital video and analog video, such as being independent display card or motherboard built-in (onboard) display card etc., and is not limited to the form of card (card).
As shown in Figure 4, suppose that the user connects single display screen K to digital-to-analog video signal switching device shifter 2 ', acquisition module 20 ' will be from the extending display identification data of single display screen K acquisition about single display screen K, to distinguish that single display screen K is as digital display screen or simulating display screen curtain.When the handover module 28 ' of user by digital-to-analog video signal switching device shifter 2 ' switched to the digital-to-analog display card 1 ' of second computer from the digital-to-analog display card 1 of the first computing machine, it was digital video or analog video that detection module 29 ' will detect the initial video signal that the digital-to-analog display card 1 ' of second computer exports.
If it is analog video that detection module 29 ' detects the initial video signal that the digital-to-analog display card 1 ' of second computer exports, and the single display screen K that is connected to digital-to-analog video signal switching device shifter 2 ' is digital display screen, driver module 22 ' will be closed dummy load circuit and be produced the hot plug detection signal to digital-to-analog display card 1 ', exports digital video to digital display screen K with the digital-to-analog display card 1 ' that drives second computer.
If it is digital video that detection module 29 ' detects the initial video signal that the digital-to-analog display card 1 ' of second computer exports, but the single display screen K that is connected to digital-to-analog video signal switching device shifter 2 ' is the simulating display screen curtain, and digital-to-analog display card 1 ' the output analog video that driver module 22 ' will start dummy load circuit 27 ' and drive second computer is to simulating display screen curtain K.
The user also can set driver module 22 ' by setting module 23 ' and drive digital-to-analog display card 1 and 1 ' output numeral or analog video, but, if display screen K is digital display screen, the user sets digital-to-analog display card 1 or 1 ' output analog video by setting module 23 ', driver module 22 ' will be ignored the setting value by setting module 23 ' input, and close dummy load circuit 27 ' and produce the hot plug detection signal to digital-to-analog display card 1 or 1 ', export digital video to digital display screen K with the digital-to-analog display card 1 or 1 ' that drives second computer; If display screen K is the simulating display screen curtain, the user sets digital-to-analog display card 1 or 1 ' output digital video by setting module 23 ', driver module 22 ' will be ignored the setting value by setting module 23 ' input, and the startup dummy load circuit is exported analog video to simulating display screen curtain K with the digital-to-analog display card 1 or 1 ' that drives second computer.
In practical application, because digital-to-analog video signal switching device shifter of the present invention can be arranged in keyboard/screen/mouse switch (KVM), and digital-to-analog display card 1 can be arranged in certain managed computer that keyboard/screen/mouse switch coupled and controlled.
The 3rd preferred embodiment according to the present invention is a kind of digital-to-analog video signal changing method.It should be noted that, the disclosed digital-to-analog video signal of this embodiment changing method is applied under the use situation of many computing machines (digital-to-analog display card) and two display screens, therefore can carry out change action between many computing machines and double screen.Therefore, this embodiment also can be applicable to not give unnecessary details separately in this in a kind of keyboard/screen/mouse switching method proposed by the invention.
Please refer to Fig. 5, Fig. 5 illustrates the process flow diagram of this digital-to-analog video signal changing method of this embodiment.As shown in Figure 5, at first, in step S80, the user all connects digital display screen and simulating display screen curtain.Then, in step S82, the method can be respectively from digital display screen and the acquisition of the simulating display screen curtain extending display identification data about digital display screen and simulating display screen curtain.
In step S84, the user sets the digital-to-analog display card default output analog video of the first computing machine and the default output of the digital-to-analog display card digital video of second computer by screen display menu, Touch Screen or hot key etc.In fact, the user also can set the digital-to-analog display card default output digital video of the first computing machine and the default output of the digital-to-analog display card analog video of second computer by screen display menu or hot key, or all export digital video, or all export analog video, there is no specific restriction.
Then, in step S86, when the user switched to the digital-to-analog display card of the first computing machine of presetting the output analog video, the method started dummy load circuit.Then, in step S88, the method drives the digital-to-analog display card output analog video of the first computing machine to the simulating display screen curtain.
In step S90, when the user switched to the digital-to-analog display card of the second computer that is preset as the output digital video by the first computing machine, the method was closed dummy load circuit and is produced the hot plug detection signal to the digital-to-analog display card of second computer.Then, in step S92, the method drives the digital-to-analog display card output digital video of second computer.
In like manner, when the user switched to the digital-to-analog display card of other computing machines, the method also can re-execute above-mentioned steps S86 ~ S92 to the digital-to-analog display card of other computing machines, and the effect of switching to reach the digital-to-analog video signal is not given unnecessary details separately in this.In fact, the method also can switch to the digital-to-analog display card of the first computing machine more first by the digital-to-analog display card of second computer, also without specific restriction.
As for its corresponding digital-to-analog video signal switching device shifter 2 " schematic diagram then please refer to Fig. 6.The digital-to-analog video signal switching device shifter 2 of this embodiment " also can be applicable to not give unnecessary details separately in this in a kind of keyboard/screen/mouse switching device proposed by the invention.As shown in Figure 6, digital-to-analog video signal switching device shifter 2 " be coupled between the digital-to-analog display card 1 ' and simulating display screen curtain 3 and digital display screen 4 of the digital-to-analog display card 1 of the first computing machine and second computer; that is the disclosed digital-to-analog video signal of this embodiment switching device shifter 2 " be applied under the use situation of many computing machines (digital-to-analog display card) and two display screens, therefore digital-to-analog video signal switching device shifter 2 " can between many computing machines (digital-to-analog display card) and two display screens, carry out change action, the digital-to-analog video signal switching device shifter 2 that this enforcement is sharp " also can be applicable under the use situation of many computing machines (digital-to-analog display card) and multi-display curtain (comprising numeral and simulating display screen curtain).Wherein, simulating display screen curtain 3 can have the VGA specification, digital display screen 4 can have the DVI specification, the digital-to-analog display card 1 of the first computing machine and the digital-to-analog display card 1 ' of second computer then are the DVI-Integrated display card, function with output digital video and analog video, such as being 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-to-analog video signal 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-to-analog display card 1 and 1 '; Processor P R " be coupled to simulating display screen curtain 3, digital display screen 4 and connecting interface 24 "; Dummy load circuit 27 " couple connecting interface 24 ", simulating display screen curtain 3 and digital display screen 4; Handover module 28 " be coupled to simulating display screen curtain 3, digital display screen 4 and connecting interface 24 " between.Processor P R " can include acquisition module 20 ", 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 can couple by the internal integrated circuit interface, but all not as limit.Dummy load circuit 27 " for example consisted of by transistor; can start (on)/close (off) dummy load circuit 27 to transistor action " (can be used as a switch to transistor at this), in practical application, dummy load circuit 27 " but carry on R, the G of video signal, B signal, but not as limit.Connecting interface 24 " in fact can be the DVI-I joint, be connected with display card by cable.
Because the user all is coupled to digital-to-analog video signal switching device shifter 2 with simulating display screen curtain 3 and digital display screen 4 ", acquisition module 20 " will distinguish self simulation display screen 3 and digital display screen 4 acquisitions about the extending display identification data of simulating display screen curtain 3 and digital display screen 4.At this moment, the user can pass through setting module 23 " (for example screen display menu, Touch Screen or hot key) set the digital-to-analog display card 1 of the first computing machine and second computer the video transmission order of digital-to-analog display card 1 ' take digital video for preferential or take analog video as preferentially.
In this embodiment, the digital-to-analog display card 1 of supposing the first computing machine is set as the digital-to-analog display card 1 ' that is transmitted as preferential and second computer with analog video and is set as with digital video and is transmitted as preferentially.In fact, the digital-to-analog display card 1 that also can set the first computing machine is transmitted as preferentially with analog video with the digital-to-analog display card 1 ' that digital video is transmitted as preferential and second computer, there is no specific restriction.If digital-to-analog video signal switching device shifter 2 " what connect first is the digital-to-analog display card 1 of the first computing machine; because the digital-to-analog display card 1 of the first computing machine is transmitted as preferentially with analog video; therefore; driver module 22 " will start dummy load circuit 27 " and the digital-to-analog display card 1 that drives the first computing machine export analog video to simulating display screen curtain 3, for simulating display screen curtain 3 display simulation video signals.
Then, if the user is by the handover module 28 of digital-to-analog video signal switching device shifter 2 ' " switch to the digital-to-analog display card 1 ' of second computer from the digital-to-analog display card 1 of the first computing machine; because the digital-to-analog display card 1 ' of second computer is transmitted as preferentially with digital video; therefore; driver module 22 " will close dummy load circuit 27 " and produce a hot plug detection signal to the digital-to-analog display card 1 ' of second computer; with digital-to-analog display card 1 ' the output digital video that drives second computer to digital display screen 4, for digital display screen 4 demonstration digital videos.As for when the handover module 28 of user by digital-to-analog video signal switching device shifter 2 ' " when switching to the digital-to-analog display card 1 of the first computing machine from the digital-to-analog display card 1 ' of second computer; the operation situation of digital-to-analog video signal switching device shifter 2 ' wherein; can be known by inference by above-mentioned, not give unnecessary details separately in this.
Further, if originally export digital video to digital display screen 4 by the digital-to-analog display card 1 of the first computing machine, then, the user is by handover module 28 " switch to simulating display screen curtain 3 by digital display screen 4; namely the user changes the video signal that the digital-to-analog display card 1 of selecting simulating display screen curtain 3 to receive the first computing machine is exported into by originally digital display screen 4; handover module 28 " be electrically connected digital-to-analog display card 1 and simulating display screen curtain 3 according to user's selection, then, driver module 22 " startup dummy load circuit 27 " to drive digital-to-analog display card 1 output analog video to simulating display screen curtain 3.
If originally export analog video to simulating display screen curtain 3 by the digital-to-analog display card 1 ' of second computer, then, the user is by handover module 28 " switch to digital display screen 4 by simulating display screen curtain 3; namely the user is changed into by originally simulating display screen curtain 3 and selects digital display screen 4 to receive the video signal that digital-to-analog display cards 1 ' are exported; handover module 28 " be electrically connected digital-to-analog display card 1 ' and digital display screen 4 according to user's selection, then driver module 22 " close dummy load circuit 27 " and produce the hot plug detection signal to digital-to-analog display card 1 ', to drive digital-to-analog display card 1 ' output digital video to digital display screen 4.
The user is by handover module 28 " when switching; also can switch simultaneously digital-to-analog display card and display screen; in an embodiment; if originally export digital video to digital display screen 4 by the digital-to-analog display card 1 ' of second computer; then; the user is by handover module 28 " switch to simulating display screen curtain 3 by digital display screen 4, switched to simultaneously the digital-to-analog display card 1 of the first computing machine by the digital-to-analog display card 1 ' of second computer, handover module 28 " will be electrically connected according to user's selection digital-to-analog display card 1 and simulating display screen curtain 3 and cut off digital-to-analog display card 1 ' and digital display screen 4 between electric connection, then driver module 22 " start dummy load circuit 27 " and drive digital-to-analog display card 1 output analog video to simulating display screen curtain 3.In fact and be not limited to above handoff relation, but between different digital/simulation display card and numeral and the simulating display screen curtain also combination in any switch, its switching mode also can be known by inference by foregoing, does not give unnecessary details separately in this.
Compared to prior art, can be by judging the kind of the display screen that inserts according to digital-to-analog video signal switching device shifter of the present invention and method, the video signal kind of exporting according to user's setting or detection display card, and the simulation mode of action that again plugs digital display screen reaches and switches the function that digital video signal or analog video signal export DVI digital display screen or VGA simulating display screen curtain to, the user need be by manually not plugging the joint of DVI digital display screen and VGA simulating display screen curtain, DVI digital display screen and VGA simulating display screen curtain namely can normally be exported the picture of appointment, suitable convenience and hommization for the user have also significantly promoted range of application and the market competitiveness of DVI-I joint.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (28)
1. a digital-to-analog video signal switching device shifter is coupled between at least one digital-to-analog display card and at least one display device, and this digital-to-analog video signal switching device shifter comprises at least:
One connecting interface couples this digital-to-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 was closed this dummy load circuit and produce a hot plug detection signal to this digital-to-analog display card, this driver module drove this digital-to-analog display card and exports a digital video to this display device; When this driver module started this dummy load circuit, this driver module drove this digital-to-analog display card and exports an analog video to this display device.
2. digital-to-analog video signal switching device shifter as claimed in claim 1 is characterized in that, further comprises:
One acquisition module is coupled to this driver module, in order to this display device acquisition certainly about an Identification display information of this display device, to judge that this display device is as a digital distance scope or an analog display device.
3. digital-to-analog video signal switching device shifter as claimed in claim 1, it is characterized in that, this driver module is a digital distance scope or an analog display device according to this display device, exports this digital video or this analog video and drive accordingly this digital-to-analog display card.
4. digital-to-analog video signal switching device shifter as claimed in claim 1 is characterized in that, further comprises:
One handover module, be coupled between this connecting interface and this display device, this handover module selects this digital-to-analog display card to export this digital video or this analog video in this at least one digital-to-analog display card according to the user, and connects accordingly selected this digital-to-analog display card and this display device.
5. digital-to-analog video signal switching device shifter as claimed in claim 4, it is characterized in that, this driver module is a digital distance scope or an analog display device according to this display device, exports this digital video or this analog video and drive accordingly selected this digital-to-analog display card of user.
6. digital-to-analog video signal switching device shifter as claimed in claim 1 is characterized in that, further comprises:
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 in this at least one display device according to the user, and connects accordingly selected this display device and this digital-to-analog display card.
7. digital-to-analog video signal switching device shifter as claimed in claim 6, it is characterized in that, when selected this display device of user was a digital distance scope or an analog display device, this driver module drove this digital-to-analog display card and exports accordingly this digital video or this analog video.
8. digital-to-analog video signal switching device shifter as claimed in claim 1 is characterized in that, further comprises:
One setting module is coupled to this driver module, uses to set this driver module for the user and drive the video signal that this digital-to-analog display card exports this display device to and be this digital video or this analog video.
9. digital-to-analog video signal switching device shifter as claimed in claim 8, it is characterized in that, this digital-to-analog display card is exported this digital video or this analog video if the user sets driving, and to should display device being an analog display device or a digital distance scope, then this driver module drives this digital-to-analog display card this analog video of corresponding output or this digital video.
10. digital-to-analog video signal switching device shifter as claimed in claim 1 is characterized in that, further comprises:
One detection module, be coupled to this driver module and this connecting interface, be this digital video or this analog video in order to detect the exporter of this initial institute of digital-to-analog display card, if this detection module person of detecting is this digital video or this analog video, and to should display device being an analog display device or a digital distance scope, then this driver module drives accordingly this digital-to-analog display card and exports this analog video or this digital video.
11. a digital-to-analog video signal changing method is applied between at least one digital-to-analog display card and at least one display device, this at least one digital-to-analog display card and this at least one display device couple a dummy load circuit, and the method comprises the following step at least:
From the Identification display information of this display device acquisition about this display device, to judge that this display device is as a digital distance scope or an analog display device;
Close and this digital-to-analog display card when receiving a hot plug detection signal when this dummy load circuit, drive this digital-to-analog display card and export a digital video to this display device; And
When this dummy load circuit starts, drive this digital-to-analog display card and export an analog video to this display device.
12. digital-to-analog video signal changing method as claimed in claim 11 is characterized in that, further comprises the following step:
The user selects this digital-to-analog display card to export this digital video or this analog video in this at least one digital-to-analog display card.
13. digital-to-analog video signal changing method as claimed in claim 12 is characterized in that, further comprises the following step:
Be this digital distance scope or this analog display device according to this display device, drive accordingly selected this digital-to-analog display card of user and export this digital video or this analog video.
14. digital-to-analog video signal changing method as claimed in claim 11 is characterized in that, further comprises the following step:
The user selects this display device to receive this digital video or this analog video in this at least one display device; And
When selected this display device of user is this digital distance scope or this analog display device, drives this digital-to-analog display card and export accordingly this digital video or this analog video.
15. digital-to-analog video signal changing method as claimed in claim 11 is characterized in that, further comprises the following step:
The user sets the video signal that this digital-to-analog display card exports this display device to and is this digital video or this analog video; And
This digital-to-analog display card is exported this digital video or this analog video if the user sets driving, and when should display device being this analog display device or this digital distance scope, then driving this digital-to-analog display card and export accordingly this analog video or this digital video.
16. digital-to-analog video signal changing method as claimed in claim 11 is characterized in that, further comprises the following step:
Detect the exporter of this initial institute of digital-to-analog display card and be this digital video or this analog video; And
If what detect is this digital video or this analog video, and when should display device being this analog display device or this digital distance scope, then driving accordingly this digital-to-analog display card and export this analog video or this digital video.
17. a keyboard/screen/mouse switching device is coupled between at least one digital-to-analog display card and at least one display device, this keyboard/screen/mouse switching device comprises at least:
One connecting interface couples this at least one digital-to-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-to-analog display card according to the user and is exported this digital video or this analog video in this at least one digital-to-analog display card, and connects accordingly selected this digital-to-analog display card and this display device; And
One driver module, couple between this dummy load circuit and this at least one display device, when this driver module was closed this dummy load circuit and produce a hot plug detection signal to selected this digital-to-analog display card of user, this driver module drove this selected digital-to-analog display card of user and exports this digital video to this display device; When this driver module started this dummy load circuit, this driver module drove this selected digital-to-analog display card of user and exports this analog video to this display device.
18. keyboard/screen/mouse switching device as claimed in claim 17 is characterized in that, further comprises:
One acquisition module is coupled to this driver module, in order to this display device acquisition certainly about an Identification display information of this display device, to judge that this display device is as a digital distance scope or an analog display device.
19. keyboard/screen/mouse switching device as claimed in claim 17, it is characterized in that, this driver module is a digital distance scope or an analog display device according to this display device, drives accordingly selected this digital-to-analog display card of user and exports this digital video or this analog video.
20. keyboard/screen/mouse switching device as claimed in claim 17, it is characterized in that, this handover module is more selected this display device in order to the foundation user and is received this digital video or this analog video in this at least one display device, and connect accordingly this selected display device and selected this digital-to-analog display card, wherein when this selected display device of user was a digital distance scope or an analog display device, this driver module drove this selected digital-to-analog display card of user and exports accordingly this digital video or this analog video.
21. keyboard/screen/mouse switching device as claimed in claim 17 is characterized in that, further comprises:
One setting module, be coupled to this driver module, use and set this driver module for the user and drive the video signal that this selected digital-to-analog display card of user exports this display device to and be this digital video or this analog video, this selected digital-to-analog display card is exported this digital video or this analog video if the user sets the driving user, and when should display device being an analog display device or a digital distance scope, then this driver module drives this selected digital-to-analog display card of user and exports accordingly this analog video or this digital video.
22. keyboard/screen/mouse switching device as claimed in claim 17 is characterized in that, further comprises:
One detection module, be coupled to this driver module, be this digital video or this analog video in order to detect the exporter of this initial institute of digital-to-analog display card, if this detection module person of detecting is this digital video or this analog video, and to should display device being an analog display device or a digital distance scope, then this driver module drives accordingly this digital-to-analog display card and exports this analog video or this digital video.
23. keyboard/screen/mouse switching method, be applied between at least one digital-to-analog display card and at least one display device, this at least one digital-to-analog display card and this at least one display device couple a dummy load circuit, and the method comprises the following step at least:
The user selects a digital-to-analog display card in this at least one digital-to-analog display card;
When this dummy load circuit is closed and the user is selected this digital-to-analog display card receives a hot plug detection signal, drive this selected digital-to-analog display card of user and export a digital video to this display device; And
When this dummy load circuit starts, drive this selected digital-to-analog display card of user and export an analog video to this display device.
24. keyboard/screen/mouse switching method as claimed in claim 23 is characterized in that, further 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 as a digital distance scope or an analog display device.
25. keyboard/screen/mouse switching method as claimed in claim 23 is characterized in that, further comprises the following step:
Be a digital distance scope or an analog display device according to this display device, drive accordingly this selected digital-to-analog display card of user and export this digital video or this analog video.
26. keyboard/screen/mouse switching method as claimed in claim 23 is characterized in that, further comprises the following step:
The user selects this display device and receives this digital video or this analog video in this at least one display device; And
When this selected display device of user is a digital distance scope or an analog display device, drives selected this digital-to-analog display card of user and export accordingly this digital video or this analog video.
27. keyboard/screen/mouse switching method as claimed in claim 23 is characterized in that, further comprises the following step:
The user sets and drives the video signal that this selected digital-to-analog display card of user exports this display device to and be this digital video or this analog video; And
This selected digital-to-analog display card is exported this digital video or this analog video if the user sets the driving user, and when should display device being an analog display device or a digital distance scope, then driving this selected digital-to-analog display card of user and export accordingly this analog video or this digital video.
28. keyboard/screen/mouse switching method as claimed in claim 23 is characterized in that, further comprises the following step:
Detect the exporter of this initial institute of digital-to-analog display card and be this digital video or this analog video; And
If what detect is this digital video or this analog video, and when should display device being an analog display device or a digital distance scope, then driving accordingly this selected digital-to-analog display card of user and export this analog video or this digital video.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
| TW101111481 | 2012-03-30 |
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| CN103365422A true CN103365422A (en) | 2013-10-23 |
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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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| TW201340031A (en) | 2013-10-01 |
| CN103365422B (en) | 2016-04-13 |
| TWI447671B (en) | 2014-08-01 |
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