CN1172242C - Method and circuit for automatically detecting and using image output terminal - Google Patents
Method and circuit for automatically detecting and using image output terminal Download PDFInfo
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- CN1172242C CN1172242C CNB011102241A CN01110224A CN1172242C CN 1172242 C CN1172242 C CN 1172242C CN B011102241 A CNB011102241 A CN B011102241A CN 01110224 A CN01110224 A CN 01110224A CN 1172242 C CN1172242 C CN 1172242C
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Abstract
The present invention relates to a method and an application circuit for automatically detecting and using image output terminals, which is suitable for a display device which is provided with an AV output terminal and an S output terminal, wherein a microswitch which is used as an automatic control switch is arranged in the S output terminal. If no S terminal cable is inserted in the S output terminal, the on-off state of the microswitch keeps unchanged, and the display device is controlled to output images from the AV output terminal; inversely, if an S terminal cable is inserted in the S output terminal, the on-off state of the microswitch is changed, and the display device is controlled to output the images from the S output terminal.
Description
Technical field
The present invention relates to a kind of image output device of computer system, especially relate to a kind of method and application circuit that can detect the use image output terminal automatically.
Background technology
The display card of being sold on the market at present has the function of TV output (TV OUT) more, and this kind display card includes S lead-out terminal and AV lead-out terminal.But the decision image will just must be jumped bonding line or change setting by work system (OS) by S lead-out terminal or the output of AV lead-out terminal.Therefore, any method that don't work is set the output type of display card, all can cause the inconvenience in the use.For instance:
1. the S terminal cable of televisor is connected to the S lead-out terminal on the display card, if display card is set at the output of AV kenel, then just video picture on the screen of televisor smoothly of the data of display card.Its reason is that the output signal of S lead-out terminal is a kind of separation signal, and the output signal of AV lead-out terminal is a kind of composite signal, so be that both output format differences cause.
2. if sets by software (for example OS), just must be with booting computer, change the kenel of output cable after the software change setting again.The setting of this kind kenel also only limits to change setting in OS, but the picture do not enter OS after start before then can't change.
3. when using bonding line to select display card, just must tear computer casing open and change jumper setting on the display card if want to change the output kenel from S lead-out terminal or the output of AV lead-out terminal.So also can cause the inconvenience in the use.
Summary of the invention
Therefore purpose of the present invention will make display card or computer motherboard detect automatically exactly and insert which kind of terminal cable, and will export the same state of terminal cable that kenel is set and inserted automatically, no longer includes the software or the trouble of hardware setting thus.
In order to realize above-mentioned purpose of the present invention, according to the present invention, a kind of method that can detect the use image output terminal is automatically proposed, it is applicable to the display device with an AV lead-out terminal and a S lead-out terminal, wherein the S lead-out terminal has a microswitch.If when the S lead-out terminal did not have a S terminal cable to insert, the on off state of microswitch remained unchanged, the control display device is from AV lead-out terminal image output.If when the S lead-out terminal had S terminal cable to insert, the on off state of microswitch can change, the control display device is from S lead-out terminal image output.Therefore, above-mentioned display device can have or not outside terminal to insert state according to the S lead-out terminal, decides by S lead-out terminal image output or by AV lead-out terminal image output the same state of terminal cable that can automatically the output kenel be set and be inserted.
In addition in order to realize above-mentioned purpose of the present invention, according to a further aspect in the invention, propose a kind of application circuit that can detect the use image output terminal automatically, it is disposed in the computer system, and comes the image outgoing route of controlling computer system with a control signal output ends.Above-mentioned application circuit comprises a microswitch and a resistance.Microswitch is coupled between an earth terminal and the control signal output ends.Resistance is coupled between a power source supply end and the control signal output ends.Therefore and microswitch is disposed in the S lead-out terminal, can have or not the mode of inserting outside terminal to decide the signal voltage of control signal output ends with the S lead-out terminal, and the image outgoing route of controlling computer system by this.
In order to realize above-mentioned purpose of the present invention, the another kind of application circuit that can detect the use image output terminal is automatically also proposed, be disposed in the computer system, and come the image outgoing route of controlling computer system with a control signal output ends.Above-mentioned application circuit comprises a bipolar junction transistor, a microswitch, one first resistance, one first resistance, a diode and one second resistance.Bipolar junction transistor has a collector, an emitter and a base stage, and its collector couples control signal output ends, and its emitter couples an earth terminal.Microswitch is coupled between earth terminal and the base stage.First resistance is coupled between a power source supply end and the control signal output ends.Diode has P end and N end, and its P end couples a grid bias power supply.Second resistance is coupled between N end and the base stage.Therefore moreover microswitch is disposed in the S lead-out terminal, can have or not the mode of inserting outside terminal to decide the signal voltage of control signal output ends with the S lead-out terminal, and the image outgoing route of controlling computer system by this.
According to a further aspect of the invention, also propose a kind of application circuit that can detect the use image output terminal automatically, be disposed in the computer system, and come the image outgoing route of controlling computer system with a control signal output ends.Above-mentioned application circuit comprises a signal inversion device, a microswitch, a diode and a resistance.The signal inversion device has a signal input part and a reversed-phase output, and in order to exporting reversed-phase output to after the signal inversion with signal input part, and reversed-phase output couples control signal output ends.Microswitch is coupled between an earth terminal and the signal input part.Diode has P end and N end, and its P end couples a grid bias power supply.Resistance is coupled between N end and the signal input part.Therefore wherein, microswitch is disposed in the S lead-out terminal, can have or not the mode of inserting outside terminal to decide the signal voltage of control signal output ends with the S lead-out terminal, and the image outgoing route of controlling computer system by this.
By the above-mentioned application circuit that can detect the use image output terminal automatically of the present invention, make display card or computer motherboard detect automatically and insert which kind of terminal cable, and will export the same state of terminal cable that kenel is set and inserted automatically, no longer include the software or the trouble of hardware setting thus.
Description of drawings
By below in conjunction with the specific descriptions of respective drawings, can make that above-mentioned purpose and advantage with other of the present invention are more clear to most preferred embodiment of the present invention.
Figure 1A is a kind of side view that has the S lead-out terminal of microswitch;
Figure 1B is the side view of the S lead-out terminal of Figure 1A figure when being inserted by an outside terminal;
Fig. 2 illustrates a kind of electrical schematic diagram that can detect the application circuit that uses image output terminal automatically of the present invention's first preferred embodiment;
Fig. 3 illustrates a kind of electrical schematic diagram that can detect the application circuit that uses image output terminal automatically of the present invention's second preferred embodiment; And
Fig. 4 illustrates a kind of electrical schematic diagram that can detect the application circuit that uses image output terminal automatically of the present invention's the 3rd preferred embodiment.
Embodiment
Proposed by the invention can detect the method for using image output terminal automatically, and it is applicable to the display device with AV lead-out terminal and S lead-out terminal.Display device can be a display card or a computer motherboard.The present invention is provided with a microswitch 110 on the S of this display device lead-out terminal 100, shown in Figure 1A, S lead-out terminal 100 does not insert outside terminal at this moment, and shell fragment 112 is in contact with one another with shell fragment 113, forms short circuit.And when S lead-out terminal 100 inserted outside terminals, shown in Figure 1B, clamping device 111 can be promoted by outside terminal and drive shell fragment 113 away from shell fragment 112, so shell fragment 112 no longer contacts with shell fragment 113, and formation is opened circuit.
The present invention uses the above-mentioned S lead-out terminal that has microswitch, the image of setting display device with the on off state of microswitch is to be exported by S lead-out terminal or AV lead-out terminal, so realizes the method that can detect the use image output terminal automatically of the present invention.For example when the S lead-out terminal did not have a S terminal cable to insert, the on off state of microswitch remained unchanged (short circuit), and the control display device is from AV lead-out terminal image output; Otherwise when the S lead-out terminal had a S terminal cable to insert, the on off state of microswitch can change (opening circuit), and the control display device is from S lead-out terminal image output.
Next, with reference to 2, Fig. 3 and Fig. 4, its respectively in order to explanation the present invention first, second with the application circuit that can detect the use image output terminal automatically of the 3rd preferred embodiment.These application circuits are disposed in the computer system, and control the image outgoing route of described computer system with the signal voltage of a control signal output ends.
As shown in Figure 2, the application circuit that can detect the use image output terminal automatically of the present invention's first preferred embodiment comprises a microswitch 200 and a resistance R 83.This microswitch 200 is coupled between an earth terminal GND and the control signal output ends VMD16.Resistance R 83 is coupled between a power source supply end TVVCC and the control signal output ends VMD16.So, when microswitch 200 short circuits, this control signal output ends VMD16 is a logic low-voltage; Otherwise when microswitch 200 opened circuit, this control signal output ends VMD16 was a logic high voltage.Therefore, can utilize the signal voltage of this control signal output ends VMD16 to set the image outgoing route of this computer system.Because above-mentioned microswitch 200 is arranged in the S lead-out terminal, so can have or not the mode of inserting outside terminal with the S lead-out terminal, the automatic setting image is exported by S lead-out terminal or AV lead-out terminal.
As shown in Figure 3, the application circuit that can detect the use image output terminal automatically of the present invention's second preferred embodiment comprises a microswitch 300, a resistance R 84, a diode D11 and a signal inversion device 310.This signal inversion device 310 has a signal input part 310a and a reversed-phase output 310b, and it can export the signal inversion Hou of signal input part 310a to reversed-phase output 310b, and this reversed-phase output 310b couples control signal output ends VMD16.This microswitch 300 is coupled between an earth terminal GND and the signal input part 310a.This diode D11 has P end 320a and N end 320b, and this P end 320a couples a grid bias power supply ESSRST.This resistance R 84 is coupled between the N end 320b and signal input part 310a of above-mentioned diode D11.
Generally speaking, grid bias power supply ESSRST is a logic high voltage.So, when microswitch 300 short circuits, signal input part 310a is a logic low-voltage, so reversed-phase output 310b is a logic high voltage, this moment, control signal output ends VMD16 was a logic high voltage; Otherwise, when microswitch 300 when opening circuit, signal input part 310a is a logic high voltage, so reversed-phase output 310b is a logic low-voltage, at this moment, control signal output ends VMD16 is a logic low-voltage.Therefore, can utilize the signal voltage of this control signal output ends VMD16 to set the image outgoing route of this computer system.Moreover because above-mentioned microswitch 300 is arranged in the S lead-out terminal, so can have or not the mode of inserting outside terminal with the S lead-out terminal, the automatic setting image is exported by S lead-out terminal or AV lead-out terminal.
As shown in Figure 4, the application circuit that can detect the use image output terminal automatically of the present invention's second preferred embodiment, comprise a bipolar junction transistor (Bipolar Junction Transistor, BJT) Q5, a resistance R 83, a microswitch 400, a resistance R 84 and a diode D11.The 3rd preferred embodiment is a kind of practical circuit of signal inversion device 310 (Fig. 3) in second preferred embodiment, and it forms a simple negative circuit with bipolar junction transistor Q5 and resistance R 83.This bipolar junction transistor Q5 has a collector C, an emitter E and a base stage B, and wherein collector C couples control signal output ends VMD16, and emitter E couples an earth terminal GND.This microswitch 400 is coupled between earth terminal GND and the base stage B.Resistance R 83 is coupled between a power source supply end TVVCC and the control signal output ends VMD16.Diode D11 has P end 410a and N end 410b, and wherein P end 410a couples a grid bias power supply ESSRST.Resistance R 84 is coupled between the N end 410b and base stage B of diode D11.
Equally, generally grid bias power supply ESSRST is a logic high voltage.So, when microswitch 400 short circuits, the base stage B of bipolar junction transistor Q5 is a logic low-voltage, so the collector C of bipolar junction transistor Q5 is a logic high voltage, this moment, control signal output ends VMD16 was a logic high voltage; Otherwise, when microswitch 400 when opening circuit, the base stage B of bipolar junction transistor Q5 is a logic high voltage, so the collector C of bipolar junction transistor Q5 is a logic low-voltage, at this moment, control signal output ends VMD16 is a logic low-voltage.Therefore, can utilize the signal voltage of this control signal output ends VMD16 to set the image outgoing route of this computer system.Moreover because above-mentioned microswitch 400 is arranged in the S lead-out terminal, so can have or not the mode of inserting outside terminal with the S lead-out terminal, the automatic setting image is exported by S lead-out terminal or AV lead-out terminal.
Though invention has been described in conjunction with the embodiments; but it is not in order to limit the present invention; for those of skill in the art; without departing from the spirit and scope of the present invention; can do various variations and modification, so protection scope of the present invention is as the criterion with the protection domain of appended claim.
Claims (9)
1. one kind can be detected the method for using the image output terminal automatically, is applicable to the display device with an AV lead-out terminal and a S lead-out terminal, and described S lead-out terminal has a microswitch; It is characterized in that described method comprises:
If when described S lead-out terminal did not have a S terminal cable to insert, the on off state of described microswitch remained unchanged, and controls described display device from described AV lead-out terminal image output; And
If when described S lead-out terminal had described S terminal cable to insert, the on off state of described microswitch can change, and controls described display device from described S lead-out terminal image output.
2. method according to claim 1 is characterized in that described display device comprises a display card.
3. method according to claim 1 is characterized in that described display device comprises a computer motherboard.
4. one kind can be detected the application circuit that uses image output terminal automatically, is disposed in the computer system, and controls the image outgoing route of described computer system with a control signal output ends; It is characterized in that described application circuit comprises:
One microswitch is coupled between an earth terminal and the control signal output ends; In order to whether to determine the signal voltage of this control signal output ends according to the short circuit of this microswitch; And
One resistance is coupled between a power source supply end and the described control signal output ends.
5. device according to claim 4 is characterized in that also comprising a S lead-out terminal, and wherein said microswitch is disposed in the described S lead-out terminal.
6. one kind can be detected the application circuit that uses image output terminal automatically, is disposed in the computer system, and controls the image outgoing route of described computer system with a control signal output ends; It is characterized in that described application circuit comprises:
One bipolar junction transistor has a collector, an emitter and a base stage, and described collector couples described control signal output ends, and described emitter couples an earth terminal;
One microswitch is coupled between described earth terminal and the described base stage, in order to whether to determine the signal voltage of this control signal output ends according to the short circuit of this microswitch;
One first resistance is coupled between a power source supply end and the described control signal output ends;
One diode has P end and N end, and described P end couples a grid bias power supply; And
One second resistance is coupled between described N end and the described base stage.
7. application circuit according to claim 6 is characterized in that also comprising a S lead-out terminal, and wherein said microswitch is disposed in the described S lead-out terminal.
8. one kind can be detected the application circuit that uses image output terminal automatically, is disposed in the computer system, and controls the image outgoing route of described computer system with a control signal output ends; It is characterized in that described application circuit comprises:
One signal inversion device has a signal input part and a reversed-phase output, and in order to exporting described reversed-phase output after the signal inversion with described signal input part to, and described reversed-phase output couples described control signal output ends;
One microswitch is coupled between an earth terminal and the described signal input part, in order to whether to determine the signal voltage of this control signal output ends according to the short circuit of this microswitch;
One diode has P end and N end, and described P end couples a grid bias power supply; And
One resistance is coupled between described N end and the described signal input part.
9. application circuit according to claim 8 is characterized in that also comprising a S lead-out terminal, and wherein said microswitch is disposed in the described S lead-out terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011102241A CN1172242C (en) | 2001-04-02 | 2001-04-02 | Method and circuit for automatically detecting and using image output terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011102241A CN1172242C (en) | 2001-04-02 | 2001-04-02 | Method and circuit for automatically detecting and using image output terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1379331A CN1379331A (en) | 2002-11-13 |
| CN1172242C true CN1172242C (en) | 2004-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011102241A Expired - Fee Related CN1172242C (en) | 2001-04-02 | 2001-04-02 | Method and circuit for automatically detecting and using image output terminal |
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| CN (1) | CN1172242C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103064496B (en) * | 2012-12-21 | 2016-08-03 | 加弘科技咨询(上海)有限公司 | The control circuit of power supply output |
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- 2001-04-02 CN CNB011102241A patent/CN1172242C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1379331A (en) | 2002-11-13 |
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