CN101620521B - KVM switch and method for providing expansion display identification data of screen - Google Patents
KVM switch and method for providing expansion display identification data of screen Download PDFInfo
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- CN101620521B CN101620521B CN200810130443.7A CN200810130443A CN101620521B CN 101620521 B CN101620521 B CN 101620521B CN 200810130443 A CN200810130443 A CN 200810130443A CN 101620521 B CN101620521 B CN 101620521B
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Abstract
The invention discloses a KVM switch and method for providing expansion display identification data of screen, capable of automatically or manually updating the expansion display identification data of screen stored by the KVM switch. The KVM switch comprises a processor, at least one internal memory and at least one switcher. When the KVM switch is starting up, replaces the screen or receives an external control signal, the processor can compare that whether the expansion display identification data of screen is the same as the expansion display identification data stored in the internal memory or not; and when the two is not the same, the expansion display identification data stored in the internal memory is overwritten by the expansion display identification data of screen. In addition, the processor sends a hot plug detecting signal to a computer, thus the computer can read updated expansion display identification data.
Description
[technical field]
The invention relates to a kind of multi-computer switch (KVM, Keyboard-Video-Mouse), espespecially a kind of can be the computer that is coupled to it, provide and upgrade multi-computer switch and the method for the expansion display identification data (EDID, Extended Display Identification Data) of screen.
[background technology]
In the time that general computer is changed screen and is directly connected in screen, can't automatically upgrade expansion display identification data.But must be first by shut down of computer, after allowing computer again start shooting, computer can read the expansion display identification data of screen.
For support screen hot plug detecting (HPD, Hot Plug Detection) computer, for example Macintosh (Macintosh, be called for short MAC) computer, in the time that Macintosh is changed screen and is directly connected in screen, hot plug detection signal detects while variation, can automatically upgrade expansion display identification data.Therefore,, as long as display card supports hot plug detecting and meeting automatically to upgrade expansion display identification data, in the time changing screen, do not need shut down of computer.
Multi-computer switch is a kind of device with some computers of peripheral unit control such as one group of keyboard, screen and mouses.As long as keyboard and mouse are connected to multi-computer switch conventionally, can use at once, as for screen after being connected to multi-computer switch, multi-computer switch can be inquired expansion display identification data to screen, and the expansion display identification data of screen is write to the internal memory of multi-computer switch, guarantee all multi-computer switch whens start of being connected to, all can read the correct expansion display identification data of screen.
Current multi-computer switch, in the time of start, can carry out reading of screen expansion display identification data, and directly upgrade the expansion display identification data in its internal memory with the expansion display identification data of screen.
If multi-computer switch is after start, when changing again again or plugging screen, multi-computer switch can't upgrade the expansion display identification data in internal memory automatically, while causing expansion display identification data in internal memory to be different from the expansion display identification data of screen, the computer that is coupled to multi-computer switch reads the real expansion display identification data of non-screen, therefore cause the generation of problem, such as screen cannot display frame, cannot support best resolution, go out the problems such as picture delay.
For the computer of support screen hot plug detecting, for example Macintosh, multi-computer switch is in the time switching, being equivalent to screen has the action of plug, Macintosh can be detected the phenomenon of this plug, therefore can carry out again reading of expansion display identification data, and this action of again reading can cause screen in the time of display frame, postpone the time of 5 to 8 seconds, cause the situation that cannot go out fast picture.In addition, in the time that all computers that are coupled to multi-computer switch are the computer of support screen hot plug detecting, change or Plug Action once screen, must be first by multi-computer switch and all shut down of computer, allow multi-computer switch again start shooting, read the expansion display identification data of screen, and upgrade after the expansion display identification data of internal memory, could allow computer read correct expansion display identification data, so for the computer of support screen hot plug detecting, change or plug screen is a thorny and need complicated process problem to be processed in the time of multi-computer switch.
[summary of the invention]
Fundamental purpose of the present invention is to provide a kind of multi-computer switch, in the time that multi-computer switch is started shooting, whether the expansion display identification data that can compare screen is identical with the expansion display identification data that is stored in the internal memory in multi-computer switch, in the time that both are identical, do not do the action of upgrading, in the time that both are different, override the expansion display identification data in internal memory with the expansion display identification data of screen, complete the action of renewal.
Another object of the present invention is to provide a kind of multi-computer switch, in the time that screen has the situation of plug or replacing, expansion display identification data that can automatic comparison screen and the expansion display identification data that is stored in the internal memory in multi-computer switch, be confirmed whether to carry out the renewal of the expansion display identification data in internal memory.
Another object of the present invention is to provide a kind of multi-computer switch, can allow user in hot key (hot key) mode, and the expansion display identification data of screen is manually override to the expansion display identification data in internal memory, completes the action of manual renewal.
Another object of the present invention is to provide a kind of multi-computer switch, for the computer of support screen hot plug detecting, when multi-computer switch is in the time switching, can reach the object that goes out fast picture.Computer to the type in addition, can carry out hot plug detecting and control, and automatically upgrades expansion display identification data.
Another object of the present invention is to disclose a kind of method of the expansion display identification data that screen is provided, and can make to be coupled to the computer of multi-computer switch, obtains the correct expansion display identification data of screen.
Multi-computer switch of the present invention, couples at least one computer to screen, and wherein this screen has one first expansion display identification data, and multi-computer switch comprises a processor, at least one internal memory and at least one switch.Processor is coupled to respectively screen and computer, and in order to receive the first expansion display identification data, and output one hot plug detection signal is to computer.Internal memory is coupled to processor, in order to store one second expansion display identification data.Switch optionally couples computer to one of screen and internal memory, in order to provide the first expansion display identification data or the second expansion display identification data to computer.
In the time that multi-computer switch is started shooting, detected screen plug or changes or receive external control signal, whether processor is compared the first expansion display identification data identical with the second expansion display identification data.Comparing the first expansion display identification data when processor, controls internal memory and overrides the second expansion display identification data with the first expansion display identification data when different from the second expansion display identification data.By the control of hot plug detection signal, make computer read correct expansion display identification data simultaneously.
In the time that multi-computer switch detects screen plug or changes or receive external control signal, and processor is compared the first expansion display identification data with the second expansion display identification data when identical, processor is by the control of hot plug detection signal, make computer read the second expansion display identification data of internal memory, read the correct expansion display identification data of screen.
The present invention can provide the method for the expansion display identification data of screen, comprises the following steps:
The first expansion display identification data of inquiry screen;
By the first expansion display identification data, compared with one second expansion display identification data that is stored at least one internal memory; And
When this comparison result is different, overrides the second expansion display identification data with the first expansion display identification data, and transmit a hot plug detection signal to computer, make computer read the first expansion display identification data from internal memory.Or, when this comparison result is identical, transmit a hot plug detection signal to computer, make computer read the second expansion display identification data from internal memory.
For above and other objects of the present invention, feature and advantage can be become apparent, coordinate appended graphicly, be described in detail below:
[accompanying drawing explanation]
Figure 1A is the calcspar according to the multi-computer switch application of first embodiment of the invention;
Figure 1B is the hot plug detection signal oscillogram that processor is sent to computer;
Fig. 2 A is the calcspar according to the multi-computer switch application of second embodiment of the invention;
Fig. 2 B is the hot plug detection signal oscillogram that processor is sent to computer;
Fig. 3 A is the calcspar according to the multi-computer switch application of third embodiment of the invention;
Fig. 3 B is the hot plug detection signal oscillogram that processor is sent to computer; And
Fig. 4 is the method flow diagram that the expansion display identification data of screen can be provided according to the present invention.
[embodiment]
Referring to Figure 1A, is the calcspar of applying according to the multi-computer switch 10 of first embodiment of the invention.Multi-computer switch 10 respectively computer 150,152 and screen 160 couples, and screen 160 has one first expansion display identification data.Multi-computer switch 10 comprises a processor 100, two internal memories 110,112, two switchs 120,122, a multiplexer 130 and a video signal interface switch 132.Processor 100 couples with screen 160 and computer 150,152 respectively, and in order to receive the first expansion display identification data of screen 160, and an exportable hot plug detection signal (HPD, Hot Plug Detection) 140 is to computer 150,152.Internal memory 110,112 sees through multiplexer 130 and is coupled to processor 100, in order to store one second expansion display identification data.Wherein internal memory 110,112 can be volatile memory or non-voltile memory.Be noted that internal memory 110,112 also can not see through multiplexer 130, and direct and processor 100 couples respectively.The function of multiplexer 130 is to provide processor 100 and the first expansion display identification data of screen 160 is seen through to the mode write memory 110,112 respectively switching.Switch 120 can optionally couple computer 150 to one of screen 160 and internal memory 110, in order to computer 150 first expansion display identification datas or the second expansion display identification data to be provided.Switch 122 can optionally couple computer 152 to one of screen 160 and internal memory 112, in order to computer 152 first expansion display identification datas or the second expansion display identification data to be provided.In the present embodiment, multi-computer switch 10 can switch to computer 150, so computer 150 reads the first or second expansion display identification data from internal memory 110 or screen 160,152, computer reads the second expansion display identification data from internal memory 112.Video signal interface switch 132 is one that selects in computer 150 and computer 152, transmit audiovisual materials to screen 160, as digital visual interface (DVI, Digital Video Interface), HDMI (High Definition Multimedia Interface) (HDMI, High Definition Multimedia Interface), Video Graphics Array interface (VGA, Video Graphics Array Interface).
When after multi-computer switch 10 starts, whether the first expansion display identification data of processor 100 automatic comparison screens 160 is with to be stored in the second expansion display identification data in internal memory 110,112 identical, in the time that both are identical, the action that processor 100 need not be done to upgrade.In the time that both are different, processor 100 maintaining heat insert-pull detection signals 140 are that one first level is sent to computer 150,152, and override respectively the second expansion display identification data in internal memory 110,112 with the first expansion display identification data of screen 160 through multiplexer 130, when internal memory 110,112 has stored after the first expansion display identification data of screen 160, processor 100 is a second electrical level by hot plug detection signal 140 by the first level conversion.
In the present embodiment, the first level is lower than second electrical level.Please refer to Figure 1B, be hot plug detection signal 140 oscillograms that processor 100 is sent to computer 150,152.In figure, hot plug detection signal 140 is to be drawn high to high level by low level.Therefore when processor 100 is compared out the expansion display identification data of screen 160 and internal memory 110,112 when different, first maintaining heat insert-pull detection signal 140 is in low level, after internal memory 110,112 has upgraded, then hot plug detection signal 140 is drawn high as high level by low level.In the time that multi-computer switch 10 switches to computer 152 from computer 150, processor 100 maintaining heat insert-pull detection signals 140 are second electrical level, in the present embodiment, to be maintained high level, maintain the object that level is constant and be the computer for support screen hot plug detecting, when multi-computer switch 10 reads the second expansion display identification data.Video signal interface switch 232 is one that selects in computer 250 and computer 252, transmits audiovisual materials to screen 260, as digital visual interface, HDMI (High Definition Multimedia Interface), Video Graphics Array interface.
When processor 200 detects screen 260 when plugging or changing, whether processor 200 is compared the first expansion display identification data identical with the second expansion display identification data, in the time that both are different, processor 200 maintaining heat insert-pull detection signals 240 are that one first level is sent to computer 250, 252, and override respectively internal memory 210 with the first expansion display identification data of screen 260 through multiplexer 230, the second expansion display identification data in 212, when internal memory 210, 212 have stored first of screen 260 expands after identification data, processor 200 is a second electrical level by hot plug detection signal 240 by the first level conversion, be converted to again the first level, the hot plug detection signal 240 of this twice level conversion, make computer 250 or 252 think that it detects screen 260 and shuts down and start shooting, or detect screen 260 and plug or change, and the request of multi-computer switch 20 being sent to expansion display identification data, from internal memory 210, 212 read the first expansion display identification data, reach the object that reads correct expansion display identification data.
When processor 200 is compared the first expansion display identification data and the internal memory 210 of screen 260, the second expansion display identification data of 212 is when identical, processor 200 is second electrical level by hot plug detection signal 240 by the first level conversion, be converted to again the first level, as mentioned above, the hot plug detection signal 240 of this twice level conversion, make computer 250 or 252 think that it detects screen 260 and shuts down and start shooting, or detect screen 260 and plug or change, and the request of multi-computer switch 20 being sent to expansion display identification data, due to the first expansion display identification data and the internal memory 210 of screen 260, the second expansion display identification data of 212 is identical, therefore directly read internal memory 210, the second expansion display identification data of 212, reach the object that reads the correct expansion display identification data of screen 260.
In the present embodiment, the first level is higher than second electrical level.Please refer to Fig. 2 B, be hot plug detection signal 240 oscillograms that processor 200 is sent to computer 250,252.In figure, hot plug detection signal 240 is to be pulled low to low level by high level, then draws high to high level.Therefore when processor 200 is compared out the expansion display identification data of screen 260 and internal memory 210,212 when different, when first maintaining heat plug is switched, allow computer 150 or 152 think to have with screen 160 always and couple, otherwise while switching, computer 150 or 152 can think that detecting screen 160 plugs or change and again read expansion display identification data, causes out picture time delay to reach the several seconds.Specify, the first level also can be higher than second electrical level, and its processing procedure is similar to the above.
It should be noted that hot plug detection signal 140 can be pulled low to low level by high level.Therefore when processor 100 is compared out the expansion display identification data of screen 160 and internal memory 110,112 when different, first maintaining heat insert-pull detection signal 140 is at high level, after internal memory 110,112 has upgraded, then hot plug detection signal 140 is dragged down as low level by high level.In the time that multi-computer switch 10 switches to computer 152 from computer 150, processor 100 maintaining heat insert-pull detection signals 140 are low level.
Referring to Fig. 2 A, is the calcspar of applying according to the multi-computer switch 20 of second embodiment of the invention.Multi-computer switch 20 couples respectively computer 250,252 to screen 260, and screen 260 has one first expansion display identification data.Multi-computer switch 20 comprises a processor 200, two internal memories 210,212, two switchs 220,222, a multiplexer 230 and a video signal interface switch 232.Processor 200 is coupled to respectively screen 260 and computer 250,252, and in order to receive the first expansion display identification data of screen 260, and an exportable hot plug detection signal 240 is to computer 250,252.Internal memory 210,212 sees through multiplexer 230 and is coupled to processor 200, in order to store the second expansion display identification data.Wherein internal memory 210,212 can be volatile memory or non-voltile memory.Be noted that internal memory 210,212 also can not see through multiplexer 230, and direct and processor 200 couples respectively.The function of multiplexer 230 is to provide processor 200 and the first expansion display identification data of screen 260 is seen through to the mode write memory 210,212 respectively switching.Switch 220 can optionally couple computer 250 to one of screen 260 and internal memory 210, in order to computer 250 first expansion display identification datas or the second expansion display identification data to be provided.Switch 222 can optionally couple computer 252 to one of screen 260 and internal memory 212, in order to computer 252 first expansion display identification datas or the second expansion display identification data to be provided.In the present embodiment, multi-computer switch 20 can switch to computer 250, so computer 250 reads the first or second expansion display identification data from internal memory 210 or screen 260,252, computer from internal memory 212 detection signals 240 at high level, after internal memory 210,212 has upgraded, hot plug detection signal 240 is pulled low to low level by high level, then draws high to high level, just like as same negative pulse (pulse).When processor 200 is compared out the expansion display identification data of screen 260 and internal memory 210,212 when identical, do not need to upgrade the expansion display identification data the second expansion display identification data of the first expansion display identification data covering memory (certainly yet can be directly with) of internal memory, and first maintaining heat insert-pull detection signal 240 is at high level, again hot plug detection signal 240 is pulled low to low level by high level, draw high again to high level, just like as same negative pulse.In the time that multi-computer switch 20 switches to computer 252 from computer 250, processor 200 maintaining heat insert-pull detection signals 240 are the first level, in the present embodiment, to be maintained high level, maintain the object that level is constant and be the computer for support screen hot plug detecting, in the time that multi-computer switch 20 switches, allow computer 250, 252 think and are all coupling with screen 260 always, otherwise in the time that multi-computer switch 20 switches, computer 250, 252 can think the plug or the replacing that detect screen 260, and again inquire and read expansion display identification data, cause out picture time delay to reach the several seconds.Specify, the first level also can be lower than second electrical level, and its processing procedure is similar to the above.
It should be noted that hot plug detection signal 240 can be drawn high to high level by low level, then be pulled low to low level.Therefore when processor 200 is compared out the expansion display identification data of screen 260 and internal memory 210,212 when different, first maintaining heat insert-pull detection signal 240 is in low level, after internal memory 210,212 has upgraded, hot plug detection signal 240 is drawn high to high level by low level, be pulled low to again low level, just like as same positive pulse.When processor 200 is compared out the expansion display identification data of screen 260 and internal memory 210,212 when identical, do not need to upgrade the expansion display identification data the second expansion display identification data of the first expansion display identification data covering memory (certainly yet can be directly with) of internal memory, and first maintaining heat insert-pull detection signal 240 is in low level, again hot plug detection signal 240 is drawn high to high level by low level, be pulled low to again low level, just like as same positive pulse.In the time that multi-computer switch 20 switches to computer 252 from computer 250, processor 200 maintaining heat insert-pull detection signals 240 are low level.
Referring to Fig. 3 A, is the calcspar of applying according to the multi-computer switch 30 of third embodiment of the invention.Multi-computer switch 30 couples respectively computer 350,352 to screen 360, and screen 360 has one first expansion display identification data.Keyboard 370 is coupled to multi-computer switch 30, in order to produce an external control signal to multi-computer switch 30.Multi-computer switch 30 comprises a processor 300, two internal memories 310,312, two switchs 320,322, a multiplexer 330 and a video signal interface switch 332.Processor 300 is coupled to respectively screen 360 and computer 350,352, the external control signal transmitting in order to detect keyboard 370, and the first expansion display identification data of reception screen 360, and an exportable hot plug detection signal 340 is to computer 350,352.Internal memory 310,312 sees through multiplexer 330 and is coupled to processor 300, in order to store the second expansion display identification data.Internal memory 310,312 can be volatile memory or non-voltile memory.Be noted that internal memory 310,312 also can not see through multiplexer 330, and direct and processor 300 couples respectively.The function of multiplexer 330 is to provide processor 300 and the first expansion display identification data of screen 360 is seen through to the mode write memory 310,312 respectively switching.Switch 320 can optionally couple computer 350 to one of screen 360 and internal memory 310, in order to computer 350 first expansion display identification datas or the second expansion display identification data to be provided.Switch 322 can optionally couple computer 352 to one of screen 360 and internal memory 312, in order to computer 352 first expansion display identification datas or the second expansion display identification data to be provided.In the present embodiment, multi-computer switch 30 can switch to computer 350, so computer 350 reads the first or second expansion display identification data from internal memory 310 or screen 360,352, computer reads the second expansion display identification data from internal memory 312.Video signal interface switch 332 is one that selects in computer 350 and computer 352, transmits audiovisual materials to screen 360, as digital visual interface, HDMI (High Definition Multimedia Interface), Video Graphics Array interface.
In the time that processor 300 detects the external control signal from keyboard 370, whether processor 300 is compared the first expansion display identification data identical with the second expansion display identification data, in the time that both are different, processor 300 maintaining heat insert-pull detection signals 340 are that one first level is sent to computer 350, 352, and override respectively internal memory 310 with the first expansion display identification data of screen 360 through multiplexer 330, the second expansion display identification data in 312, when internal memory 310, 312 have stored first of screen 360 expands after identification data, processor 300 is a second electrical level by hot plug detection signal 340 by the first level conversion, be converted to again the first level, the hot plug detection signal 340 of this twice level conversion, make computer 350 or 352 think that it detects screen 360 and shuts down and start shooting, or detect screen plug or change, and the request of multi-computer switch 30 being sent to expansion display identification data, from internal memory 310, 312 read the first expansion display identification data, reach the object that reads correct expansion display identification data.
When processor 300 is compared the first expansion display identification data and the internal memory 310 of screen 360, the second expansion display identification data of 312 is when identical, processor 300 is second electrical level by hot plug detection signal 340 by the first level conversion, be converted to again the first level, as mentioned above, the hot plug detection signal 340 of this twice level conversion, make computer 350 or 352 think that it detects screen 360 and shuts down and start shooting, or detect screen 360 and plug or change, and the request of multi-computer switch 30 being sent to expansion display identification data, due to the first expansion display identification data and the internal memory 310 of screen 360, the second expansion display identification data of 312 is identical, therefore directly read internal memory 310, the second expansion display identification data of 312, reach the object that reads the correct expansion display identification data of screen 360.
In the present embodiment, the first level is higher than second electrical level.Please refer to Fig. 3 B, be hot plug detection signal 340 oscillograms that processor 300 is sent to computer 350,352.In figure, hot plug detection signal 340 is to be pulled low to low level by high level, then draws high to high level.Therefore when processor 300 is compared out the expansion display identification data of screen 360 and internal memory 310,312 when different, first maintaining heat insert-pull detection signal 340 is at high level, after internal memory 310,312 has upgraded, hot plug detection signal 340 is pulled low to low level by high level, draw high again to high level, just like as same negative pulse.When processor 300 is compared out the expansion display identification data of screen 360 and internal memory 310,312 when identical, do not need to upgrade the expansion display identification data the second expansion display identification data of the first expansion display identification data covering memory (certainly yet can be directly with) of internal memory, and first maintaining heat insert-pull detection signal 340 is at high level, again hot plug detection signal 340 is pulled low to low level by high level, draw high again to high level, just like as same negative pulse.In the time that multi-computer switch 30 switches to computer 352 from computer 350, processor 300 maintaining heat insert-pull detection signals 340 are the first level, in the present embodiment, to be maintained high level, maintain the object that level is constant and be the computer for support screen hot plug detecting, in the time that multi-computer switch 30 switches, allow computer 350,352 think to have with screen 360 always and couple, otherwise computer 350,352 can think that detecting screen 360 plugs or change and again read expansion display identification data, causes out picture time delay to reach the several seconds in the time switching.Specify, the first level also can be lower than second electrical level, and its processing procedure is similar to the above.As for external control signal, except the keyboard 370 by above-mentioned can produce in hot key mode, mouse, pushbutton switch, wire/wireless remote controller and any peripheral unit (peripherals) applicable to computer 350,352 and multi-computer switch 30 etc., also can, with so that multi-computer switch 30 manually upgrades internal memory 310,312 interior expansion display identification datas, all can be used as the source of external control signal.
It should be noted that hot plug detection signal 340 is to be drawn high to high level by low level, then be pulled low to low level.Therefore when processor 300 is compared out the expansion display identification data of screen 360 and internal memory 310,312 when different, first maintaining heat insert-pull detection signal 340 is in low level, after internal memory 310,312 has upgraded, hot plug detection signal 340 is drawn high to high level by low level, be pulled low to again low level, just like as same positive pulse.When processor 300 is compared out the expansion display identification data of screen 360 and internal memory 310,312 when identical, do not need to upgrade the expansion display identification data the second expansion display identification data of the first expansion display identification data covering memory (certainly yet can be directly with) of internal memory, and first maintaining heat insert-pull detection signal 340 is in low level, again hot plug detection signal 340 is drawn high to high level by low level, be pulled low to again low level, just like as same positive pulse.In the time that multi-computer switch 30 switches to computer 352 from computer 350, processor 300 maintaining heat insert-pull detection signals 340 are low level.
Referring to Fig. 4, is the method flow diagram that the expansion display identification data of screen can be provided according to the present invention.Method of the present invention comprises the following steps:
Step 420-1, if the comparison result of step 420 is for being (identical), does not upgrade the second expansion display identification data, but transmits hot plug detection signal to computer; And
Step 420-2, if the comparison result of step 420 is no (difference), override the second expansion display identification data with the first expansion display identification data, and transmit a hot plug detection signal to computer, make computer read the first expansion display identification data from internal memory.In addition, change or plug screen, carry out the situation of hot key when having, no matter how the expansion display identification data of computer switch has or not while renewal, and processor will carry out the change of hot plug detection signal.Again, when there being the situation of changing or plugging screen, carry out hot key, no matter while having or not change from the expansion display identification data of screen, processor can first cover the second expansion display identification data with the first expansion display identification data, carries out the change of hot plug detection signal and continue.
Wherein hot plug detection signal is that a high level is pulled low to a low level, then draws high the signal into high level.Or one low level draw high to a high level, then drag down as low level signal.The object of hot plug detection signal is the computer for support screen hot plug detecting, makes it detect the phenomenon that screen has plug or changes, and automatically removes to read the expansion display identification data being stored in internal memory.
Major advantage of the present invention comprises: (a) after multi-computer switch start, whether meeting automatic comparison screen is identical with the expansion display identification data in internal memory, when different, can override expansion display identification data in internal memory when identical (also can utilize the expansion display identification data of screen to override the expansion display identification data in internal memory) with the expansion display identification data of screen, make the computer that is coupled to multi-computer switch can read correct expansion display identification data; (b), while changing screen, multi-computer switch can detect screen replacing, automatically upgrades the expansion display identification data in internal memory; (c) can provide user the mode with hot key, manually upgrade the expansion display identification data in internal memory; (d) control mode of hot plug detection signal, the computer that can solve support screen hot plug detecting goes out the problem that picture postpones.
Claims (13)
1. a multi-computer switch, couple at least one computer to screen, wherein this screen has one first expansion display identification data EDID, it is characterized in that, this multi-computer switch comprises: a processor, at least one internal memory and at least one switch, wherein this processor is coupled to respectively this screen and this at least one computer, in order to receive this first expansion display identification data, and one hot plug detection signal HPD is to this at least one computer in output, this at least one internal memory is coupled to this processor, in order to store one second expansion display identification data, this at least one switch optionally couple this at least one computer one of them to one of this screen and this internal memory, in order to provide this first expansion display identification data or this second expansion display identification data to this computer, when after this multi-computer switch start, whether this processor is compared this first expansion display identification data identical with this second expansion display identification data, when this processor is compared this first expansion display identification data when different from this second expansion display identification data, it is one first level that this processor maintains with this hot plug detection signal on each computer being connected on this switch, this this internal memory of processor control overrides this second expansion display identification data with this first expansion display identification data, when after this first expansion display identification data of this memory storage, this processor is a second electrical level by this hot plug detection signal by this first level conversion, wherein this first level is below or above this second electrical level.
2. multi-computer switch according to claim 1, is characterized in that, more comprises a multiplexer, couples this processor to this internal memory, to transmit this first expansion display identification data to this internal memory.
3. multi-computer switch according to claim 1, is characterized in that, in the time switching a computer to another computer, it is this second electrical level that this processor maintains this hot plug detection signal.
4. a multi-computer switch, couple at least one computer to screen, wherein this screen has one first expansion display identification data EDID, it is characterized in that, this multi-computer switch comprises: a processor, at least one internal memory and at least one switch, wherein processor is coupled to respectively this screen and this at least one computer, whether plug or change in order to detect this screen, this processor is in order to receive this first expansion display identification data, and one hot plug detection signal HPD is to this at least one computer in output, this at least one internal memory is coupled to this processor, store one second expansion display identification data, this at least one switch optionally couple this at least one computer one of them to one of this screen and this internal memory, in order to provide this first expansion display identification data or this second expansion display identification data to this computer, in the time that this processor detects this screen plug or changes, whether this processor is compared this first expansion display identification data identical with this second expansion display identification data, when this processor is compared this first expansion display identification data when different from this second expansion display identification data, it is one first level that this processor maintains with this hot plug detection signal on each computer being connected on this switch, this this internal memory of processor control overrides this second expansion display identification data with this first expansion display identification data, when after this first expansion display identification data of this memory storage, this processor is a second electrical level by this hot plug detection signal by this first level conversion, be converted to again this first level, make this computer read this first expansion display identification data from this internal memory, when this processor is compared this first expansion display identification data when identical with this second expansion display identification data, this processor is a second electrical level by this hot plug detection signal by one first level conversion, be converted to again this first level, make this computer read this second expansion display identification data from this internal memory, wherein this first level lower than or higher than this second electrical level.
5. multi-computer switch according to claim 4, is characterized in that, more comprises a multiplexer, couples this processor to this internal memory, to transmit this first expansion display identification data to this internal memory.
6. multi-computer switch according to claim 4, is characterized in that, in the time switching a computer to another computer, it is this first level that this processor maintains this hot plug detection signal.
7. a multi-computer switch, couples at least one computer to screen, and receives an external control signal, and wherein this screen has one first expansion display identification data EDID, it is characterized in that, this multi-computer switch comprises:
One processor, is coupled to respectively this screen and this at least one computer, and in order to detect this external control signal, this processor is in order to receive this first expansion display identification data, and output one hot plug detection signal HPD is to this at least one computer;
At least one internal memory, is coupled to this processor, in order to store one second expansion display identification data; And
At least one switch, optionally couple this at least one computer one of them to one of this screen and this internal memory, in order to provide this first expansion display identification data or this second expansion display identification data to this computer;
In the time that this processor detects this external control signal, whether this processor is compared this first expansion display identification data identical with this second expansion display identification data;
When this processor is compared this first expansion display identification data when different from this second expansion display identification data, it is one first level that this processor maintains with this hot plug detection signal on each computer being connected on this switch, this this internal memory of processor control overrides this second expansion display identification data with this first expansion display identification data, after this first expansion display identification data of this memory storage overrides, this processor is a second electrical level by this hot plug detection signal by this first level conversion, be converted to again this first level, make this computer read this first expansion display identification data from this internal memory, when this processor is compared this first expansion display identification data when identical with this second expansion display identification data, this processor is a second electrical level by this hot plug detection signal by one first level conversion, be converted to again this first level, make this computer read this second expansion display identification data from this internal memory, wherein this first level lower than or higher than this second electrical level.
8. multi-computer switch according to claim 7, is characterized in that, this external control signal is by least one generation being coupled in a keyboard, a mouse and a pushbutton switch of this multi-computer switch.
9. multi-computer switch according to claim 7, is characterized in that, more comprises a multiplexer, couples this processor to this internal memory, to transmit this first expansion display identification data to this internal memory.
10. multi-computer switch according to claim 7, is characterized in that, in the time switching a computer to another computer, it is this first level that this processor maintains this hot plug detection signal.
11. 1 kinds can provide the method for the expansion display identification data EDID of screen, make to couple at least one computer to a multi-computer switch with a processor, at least one internal memory and at least one switch, obtain one first expansion display identification data of a screen, it is characterized in that, the method comprises the following steps:
This multi-computer switch is inquired this first expansion display identification data of this screen, and output one hot plug detection signal HPD is to this at least one computer;
This multi-computer switch, by this first expansion display identification data, is compared with one second expansion display identification data that is stored in this at least one internal memory; And
When this comparison result is different, it is one first level that this processor maintains with this hot plug detection signal on each computer being connected on this switch, this multi-computer switch overrides this second expansion display identification data with this first expansion display identification data, when after this first expansion display identification data of this memory storage, this processor is a second electrical level by this hot plug detection signal by this first level conversion, be converted to again this first level, make this computer read this first expansion display identification data from this internal memory, when this comparison result is identical, this multi-computer switch transmits this hot plug detection signal to this computer, make this computer read this second expansion display identification data from this internal memory.
The method of 12. expansion display identification datas that screen is provided according to claim 11, is characterized in that, this first level is a high level, and this second electrical level is a low level signal.
The method of 13. expansion display identification datas that screen is provided according to claim 11, is characterized in that, this first level is a low level, and this second electrical level is the signal of a high level.
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| TWI518673B (en) * | 2014-04-02 | 2016-01-21 | 宏正自動科技股份有限公司 | Video switch and switching method thereof |
| TWI610289B (en) * | 2016-08-12 | 2018-01-01 | 晨星半導體股份有限公司 | Display controller and operation method thereof |
| CN106155618A (en) * | 2016-08-15 | 2016-11-23 | 广东欧珀移动通信有限公司 | The method and system of mobile terminal display screen hot plug |
| CN106528031A (en) * | 2016-10-17 | 2017-03-22 | 广州视睿电子科技有限公司 | Extended display identification data reading method and device |
| CN106686332B (en) * | 2016-11-17 | 2020-07-14 | 西安诺瓦星云科技股份有限公司 | Video display control method and EDID management method |
| CN106851233B (en) * | 2017-01-20 | 2020-04-07 | 中航光电科技股份有限公司 | Automatic updating method and device for EDID information of high-definition video optical transmitter and receiver |
| CN112485934B (en) * | 2020-11-26 | 2023-11-03 | 深圳市艾比森光电股份有限公司 | Hot plug detection method and related device for LED display screen |
| CN112866608B (en) * | 2021-01-11 | 2022-07-05 | 浙江大华技术股份有限公司 | Adaptive setting method and device for HDMI resolution and electronic device |
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