CN106470324A - It is applied to the control circuit of digital visual interface and the control method of correlation - Google Patents
It is applied to the control circuit of digital visual interface and the control method of correlation Download PDFInfo
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- CN106470324A CN106470324A CN201510513890.0A CN201510513890A CN106470324A CN 106470324 A CN106470324 A CN 106470324A CN 201510513890 A CN201510513890 A CN 201510513890A CN 106470324 A CN106470324 A CN 106470324A
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- pin
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Abstract
The present invention proposes a kind of control circuit being applied to digital visual interface, includes a testing circuit and a switching circuit, wherein this testing circuit is the state of the specific pin detecting a digital visual interface joint to produce a control signal；And this switching circuit be in order to optionally one first pin of this digital visual interface joint and one second pin are connected to according to this control signal the storage element storing one first identification data and the storage element storing one second identification data one of them.
Description
Technical field
The invention relates to display, espespecially a kind of control circuit being applied to digital visual interface and correlation
Control method.
Background technology
Traditionally when digital visual interface (Digital Visual Interface, the DVI) joint on a display leads to
When crossing connecting line and being connected with the display card of an image transmission end (such as host computer), display card can directly go to read
Take in display one extend display capabilities identification data (Extended display identification data,
EDID), and extend display capabilities identification data according to this video data is sent in display.Wherein,
Which kind of extension display capabilities identification data is selected to be that user passes through regarding control adjustment function (On Screen
Display, OSD) come set, when user setting display is simulation model (DVI-A) (or claim
Video Graphics Array (Video Graphics Array, VGA) pattern) when, display card just can only read
The extension display capabilities identification data of DVI-A；In the same manner, when user setting display is figure pattern
(DVI-D), when, display card just can only read the extension display capabilities identification data of DVI-D.
As noted previously, as the read display capabilities identification data that extends of display card is according to user
Set and to determine, because of this, it is very likely that display card can receive incorrect extension display capabilities identification data,
And cause the wrong and operational trouble of follow-up display.For example, if transmitted is several to display card
Word signal, and display is connected to by DVI-D connecting line, but the setting of display is DVI-A pattern,
Then now show that card can read the extension display capabilities identification data of DVI-A, thus be judged to support,
Therefore show that card just will not transmit any video data completely in display.Now, if user will again
Display is set as that DVI-D pattern is not also used, because display card will not again read off the extension in display
Display capabilities identification data.Run into this situation, display can only be set as after DVI-D pattern by user,
Again connecting line is plugged once again, display could normally show.
On the other hand, if transmitted is analogue signal to display card, and connecting line be DVI-A connecting line (also
VGA connecting line can be claimed), but the setting of display is DVI-D pattern, then now show that card can read DVI-D
Extension display capabilities identification data, and transmit the video data of timing error in display, now use
Person also can only display be reset to after DVI-A pattern again, then connecting line is plugged once again,
Correct display picture can be watched.
Content of the invention
Therefore, an object of the present invention be to provide a kind of control circuit being applied to digital visual interface and
Related control method, its can correctly judge be connected to display connecting line be DVI-D connecting line or
It is DVI-A connecting line, and guarantee to show that card can read correct extension display capabilities identification data, with
Solve the problems of the prior art.
According to one embodiment of the invention, a kind of control circuit of digital visual interface include a testing circuit with
And a switching circuit, wherein this testing circuit is the specific pin detecting a digital visual interface joint
State to produce a control signal；And this switching circuit will be in order to optionally will according to this control signal
One first pin of this digital visual interface joint and one second pin are connected to and store one first identification number
According to one first storage element and one second storage element storing one second identification data one of them.
According to another embodiment of the present invention, a kind of control method of digital visual interface, include：Detection one
The state of one specific pin of digital visual interface joint, to produce a control signal；And according to this control
Signal optionally one first pin of this digital visual interface joint and one second pin to be connected to storage
One first storage element having one first identification data and one second storage storing one second identification data
One of them of memory cell.
Brief description
It is that the above objects, features and advantages of the present invention can be become apparent, below in conjunction with accompanying drawing to this
Bright specific embodiment elaborates, wherein：
Fig. 1 is the schematic diagram of the display according to one embodiment of the invention.
Fig. 2 show the schematic diagram of DVI-I joint.
Fig. 3 is according to the testing circuit of one embodiment of the invention and the schematic diagram of switching circuit.
Fig. 4 is a kind of control method flow chart of the digital visual interface according to one embodiment of the invention.
Fig. 5 is a kind of control method flow chart of the digital visual interface according to another embodiment of the present invention.
In figure component label instructions：
100 display
102 connecting lines
110 control circuits
112 testing circuits
114 switching circuits
120 first storage elements
130 second storage elements
140 DVI-I joints
400～404,500～504 steps
Q1, Q2 transistor
R1～R8 resistance
X, Y, X0, Y0, X1, Y1 end points
Specific embodiment
Refer to Fig. 1, Fig. 1 is the schematic diagram of the display 100 according to one embodiment of the invention.As Fig. 1
Shown, display 100 contains a control circuit 110, one first storage element 120, one second storage
Unit 120 and integrated digital visual interface (DVI_I) joint 140, wherein control circuit 110 comprises
One testing circuit 112 and a switching circuit 114.In the present embodiment, the first storage element 120 is
It is used for storing the first identification data, in the present embodiment for the extension display capabilities identification data of simulation model
(Extended display identification data, EDID), or claim the extension display capabilities identification of VGA
Data, and the first storage element 120 can use the programmable read-only storage of Electrical Erasable
Device (Electrically-Erasable Programmable Read-Only Memory, EEPROM) or its
He carrys out implementation by any suitable storage element；And second storage element 130 be used to store the second identification number
According in the present embodiment for the extension display capabilities identification data of figure pattern, or the extension of title DVI shows
Capability identification data, and the second storage element 130 also can using Electrical Erasable programmable read only memory or
It is that other any suitable storage elements carry out implementation.
DVI_I joint 140 is used to engage with a connecting line 102, and display 100 passes through connecting line 102
To receive analog or digital video data from a display clamping.Connecting line 102 can be DVI-A connecting line (or
Claim VGA transmission line), or DVI-D connecting line (or claiming DVI transmission line).Further, since video data
Reception and process and the content that will be discussed of non-invention, therefore Fig. 1 does not show reception and the place of correlation
Reason circuit.
In display 100 shown in Fig. 1, when connecting line 102 is connected to DVI-I joint 140, inspection
Slowdown monitoring circuit 112 can detect the state of a specific pin of DVI-I joint 140, to judge connecting line 102
It is DVI-A connecting line or DVI-D connecting line, and produce control signal Vc according to this.Specifically,
Refer to Fig. 2, Fig. 2 is the schematic diagram of DVI-I joint 140.As shown in Fig. 2 DVI-I joint 140
Contain numbering 1～24 and C1～C5 totally 29 pins, and because the function of each pin has been ability
Known to field technique personnel, therefore details will not be described here.In the present embodiment, this specific pin can be
The pin that numbering the 3rd, 11,19 or 22, and in the related specifications of DVI, when connecting line 102 is
DVI-D connecting line and when input signal is digital signal, the pin that numbering the 3rd, 11,19 or 22 is
It is defined as data mask (shield) or seasonal pulse shielding, and be attached to earthing potential (ground)；And when connection
Line 102 is DVI-A connecting line and when input signal is analogue signal, numbering the 3rd, 11,19 or 22
Pin be defined as sky and meet (floating).Therefore, the testing circuit 112 in the present embodiment detects that this is specific
Pin has been the state that connects or a ground state, with judge connecting line 102 be DVI-A connecting line or
DVI-D connecting line.
When it has been to connect state that testing circuit 112 detects this specific pin, then judge that connecting line 102 is
DVI-A connecting line, and transmit control signal Vc to switching circuit 114, to control switching circuit 114 to incite somebody to action
DVI-I joint 140 is connected to the first storage element 120 so that display card can by connecting line 102,
DVI-I joint 140 and switching circuit 114 are connected to the first storage element 120, and read and be stored in first
DVI-A in storage element 120 extends display capabilities identification data；On the other hand, when testing circuit 112
When this specific pin is detected be a ground state, then judge that connecting line 102 is DVI-D connecting line, and pass
Send control signal Vc to switching circuit 114, to control switching circuit 114 to be connected to DVI-I joint 140
Second storage element 130, so that display card by connecting line 102, DVI-I joint 140 and can be cut
Change circuit 114 and be connected to the second storage element 130, and read and be stored in the second storage element 130
DVI-D extends display capabilities identification data.As noted previously, as control circuit 110 can be automatically and correctly
DVI-I joint 140 is connected to suitable storage element by ground, thereby it can be assured that display card can read
Extend display capabilities identification data to correct, to avoid the situation of identification data read error in prior art
Occur.
The operation of above-mentioned detector unit 112 and switching circuit 114 is to continue and ongoing, that is, just in case
When DVI-I joint 140 is connected to different connecting lines, detector unit 112 and switching circuit 114 can also
At once DVI-I joint 140 is connected to suitable storage element.
Furthermore, it is contemplated that VGA shows being stuck in when reading wrong extension display capabilities identification data still
Can continue to transmit video data and arrive display 100, but DVI show and is stuck in that to read wrong extension aobvious
Show the situation that just will not transmit video data during capability identification data, therefore, in one embodiment, pre- one
If under state, DVI-I joint 140 can be connected to the second storage element 130 by switching circuit 114.So
Even if one judges by accident, due to VGA display card continue to transmit data, display still can display picture (can
Can be the picture of mistake), user can plug joint according to this again makes it again detect.
With reference to Fig. 3, it is the testing circuit 112 and switching circuit 114 according to one embodiment of the invention
Schematic diagram.It is noted that the circuit framework shown in the 3rd is used only to testing circuit 112 is described and cuts
Change the operation of circuit 114 and possible implementation, and be not the restriction as the present invention.As Fig. 3 institute
Show, testing circuit 112 contains transistor Q1, Q2 and multiple resistance R1～R6, and it can be according to numbering
The state of the pin pin of numbering the 11st, 19 or 22 (but also) of No. 3 is producing control signal Vc；
And end points X, Y of switching circuit 114 are then connected to DVI-I joint 140 by resistance R7, R8 respectively
Numbering the 6th, 7 pin, wherein numbering the 6th pin for display card transmission seasonal pulse to display,
The pin that numbering the 7th is then for requiring instruction to extend display energy to display to read for display card transmission one
Power identification data and for display by extend display capabilities identification data send to display card, switching circuit
114 are used for, according to control signal Vc, end points X, Y are used to selectively connect to end points X0, Y0, or
It is connected to end points X1, Y1.Specifically, when the pin of numbering the 3rd has been to connect state, control
Signal Vc be high voltage potential, and now switching circuit can by end points X, Y be connected respectively to end points X0,
Y0, to allow display card can read storage by the pin of the numbering the 6th, 7 of DVI-I joint 140
DVI-A in the first storage element 120 extends display capabilities identification data；On the other hand, when numbering
When the pin of No. 3 is a ground state, control signal Vc is low voltage potential, and now switching circuit can be by
End points X, Y are connected respectively to end points X1, Y1, to allow display card can pass through DVI-I joint 140
The pin that numbering the 6th, 7 extends display energy reading the DVI-D that is stored in the second storage element 130
Power identification data.
Refer to Fig. 4, it is a kind of control being applied to digital visual interface according to one embodiment of the invention
Method flow diagram, with reference to Fig. 1～4, flow process is as follows：
Step 400：Flow process starts.
Step 402：Detect the state of a specific pin of a digital visual interface joint, to produce a control
Signal.
Step 404：Optionally the 1 of this digital visual interface joint first is connect according to this control signal
Foot and one second pin are connected to the first storage element storing one first identification data or store one
One of them of second storage element of the second identification data.
In the above-described embodiments, testing circuit 112 only can detect the state of a specific pin to produce control
Signal Vc, however, in other embodiments of the invention, testing circuit can also detect DVI-I simultaneously
The state of another specific pin of joint 140, and produce control according to the state of this two specific pins simultaneously
Signal Vc, to avoid the faulty situation of one of specific pin to occur.Specifically, above-mentioned two
Specific pin can be any of which two of the 3rd, 11,19, No. 22 pins of numbering in DVI-I joint 140
Individual pin, the such as pin of numbering the 3rd, 19, and testing circuit can detect numbering the 3rd, 19 respectively
Number pin be the state that connects or a ground state, and according to testing result to judge connecting line 102
It is DVI-A connecting line or DVI-D connecting line.On the other hand, similarly, testing circuit can also be same
When detection DVI-I joint 140 three or four specific pins state, for example detect DVI-I joint 140
The state of three pins of any of which of middle the 3rd, 11,19, No. 22 pins of numbering or numbering the 3rd,
11st, 19, No. 22 whole states of pin, and according to testing result statistically judging connecting line
102 is DVI-A connecting line or DVI-D connecting line.
Refer to Fig. 5, it is a kind of control being applied to digital visual interface according to another embodiment of the present invention
Method flow diagram processed, with reference to Fig. 5, flow process is as follows：
Step 500：Flow process starts.
Step 502：Detect the state of the multiple specific pin of a digital visual interface joint, to produce a control
Signal processed.
Step 504：Optionally the 1 of this digital visual interface joint first is connect according to this control signal
Foot and one second pin are connected to the first storage element storing one first identification data or store one
One of them of second storage element of the second identification data.
The brief summary present invention, is applied to the control circuit of digital visual interface and the control of correlation in the present invention
In method processed, it is that the state of specially pin according to joint judges that the connecting line being connected to display is
DVI-D connecting line or DVI-A connecting line, and joint is connected to correct extension display capabilities identification number
According to, with guarantee to show card can read correct extend display capabilities identification data, and then avoid existing
Show in technology that card misreads the problem of identification data.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, Ren Heben
Skilled person, without departing from the spirit and scope of the present invention, when a little modification and perfect can be made,
Therefore protection scope of the present invention is when by being defined that claims are defined.
Claims (16)
1. one kind is applied to the control circuit of digital visual interface (Digital Visual Interface, DVI), bag
Contain：
One testing circuit, in order to detect the state of a specific pin of a digital visual interface joint, to produce
One control signal；And
One switching circuit, in order to according to this control signal come optionally by the one of this digital visual interface joint
First pin and one second pin are connected to one first storage element storing one first identification data and storage
Have one second identification data one second storage element one of them.
2. control circuit as claimed in claim 1 is it is characterised in that this digital visual interface joint is one
Integrated digital visual interface (DVI-I) joint, this first identification data is the extension display capabilities of simulation model
Identification data (Extended display identification data, EDID), and this second identification data is number
The extension display capabilities identification data of word pattern.
3. control circuit as claimed in claim 2 is it is characterised in that under a preset state, this switching
It is single that this first pin of this digital visual interface joint and this second pin are connected to this second storage by circuit
Unit.
4. control circuit as claimed in claim 1 is it is characterised in that this testing circuit detects that this specific connects
Foot has been one of them connecing (floating) state and a ground state, to produce this control signal.
5. control circuit as claimed in claim 4 is it is characterised in that this first identification data is simulation mould
The extension display capabilities identification data of formula, and the second identification data is the extension display capabilities identification of figure pattern
Data；When it is that this sky connects state that this testing circuit detects this specific pin, this switching circuit is according to this control
Signal processed is to be connected to this first storage by this first pin of this digital visual interface joint and this second pin
Memory cell；And when this testing circuit detects this specific pin and is this ground state, this switching circuit root
According to this control signal so that this first pin of this digital visual interface joint and this second pin are connected to this
Second storage element.
6. control circuit as claimed in claim 1 is it is characterised in that this digital visual interface joint is one
Integrated digital visual interface joint, and this specific pin is an integrated digital visual interface specification (DVI_I)
In the pin of numbering the 3rd, 11,19 and 22 one of them.
7. control circuit as claimed in claim 6 is it is characterised in that this testing circuit more detects this numeral
The state of another specific pin of video interface joint, and according to this specific pin and this another specific pin
State produces this control signal, and wherein this another specific pin is in this integrated digital visual interface specification
Numbering the 3rd, 11,19 is wherein another with the pin of No. 22.
8. control circuit as claimed in claim 1 is it is characterised in that this control circuit is located at a display
In, and this digital visual interface joint is arranged on this display.
9. a kind of control method being applied to digital visual interface, includes：
Detect the state of a specific pin of a digital visual interface joint, to produce a control signal；And
According to this control signal come optionally by one first pin of this digital visual interface joint and one
Two pins are connected to one first storage element storing one first identification data and identify with storing one second
One of them of one second storage element of data.
10. control method as claimed in claim 9 is it is characterised in that this digital visual interface joint is
One integrated digital visual interface (DVI-I) joint, this first identification data is that the extension of simulation model shows energy
Power identification data, and the second identification data is the extension display capabilities identification data of figure pattern.
11. control methods as claimed in claim 10, have additionally comprised：
Under a preset state, this first pin of this digital visual interface joint is connected with this second pin
To this second storage element.
12. control methods as claimed in claim 9 are it is characterised in that the step that produces this control signal
Include：
Detect that this specific pin has been one of them connecing (floating) state and a ground state, to produce
This control signal.
13. control methods as claimed in claim 12 are it is characterised in that this first identification data is simulation
The extension display capabilities identification data of pattern, and the second identification data is the extension display capabilities knowledge of figure pattern
Other data, and produce the step of this control signal and include：
When this specific pin is detected is that this sky connects state, according to this control signal to connect this digital video
This first pin of mouth joint is connected to this first storage element with this second pin；And
When this specific pin is detected and being this ground state, according to this control signal to connect this digital video
This first pin of mouth joint is connected to this second storage element with this second pin.
14. control methods as claimed in claim 9 are it is characterised in that this digital visual interface joint is
One integrated digital visual interface joint, and this specific pin is an integrated digital visual interface specification
(DVI_I) one of them of the pin of the numbering in the 3rd, 11,19 and 22.
15. control methods as claimed in claim 14, have additionally comprised：
Detect the state of another specific pin of this digital visual interface joint, and according to this specific pin and be somebody's turn to do
The state of another specific pin produces this control signal it is characterised in that this another specific pin is this integration
Numbering the 3rd, 11,19 in type digital visual interface specification is therein another with the pin of No. 22.
16. control methods as claimed in claim 9 are it is characterised in that this control method is to be applied to one
In display, and this digital visual interface joint is arranged on this display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510513890.0A CN106470324A (en) | 2015-08-20 | 2015-08-20 | It is applied to the control circuit of digital visual interface and the control method of correlation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510513890.0A CN106470324A (en) | 2015-08-20 | 2015-08-20 | It is applied to the control circuit of digital visual interface and the control method of correlation |
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|---|---|
| CN106470324A true CN106470324A (en) | 2017-03-01 |
Family
ID=58229028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510513890.0A Pending CN106470324A (en) | 2015-08-20 | 2015-08-20 | It is applied to the control circuit of digital visual interface and the control method of correlation |
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Cited By (1)
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| CN109857684A (en) * | 2019-01-04 | 2019-06-07 | 烽火通信科技股份有限公司 | The device, method and system of communication device board card slot bit address and type identification |
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Application publication date: 20170301 |