CN101583048A - Signal detection device of VGA channel - Google Patents
Signal detection device of VGA channel Download PDFInfo
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- CN101583048A CN101583048A CNA2009101079490A CN200910107949A CN101583048A CN 101583048 A CN101583048 A CN 101583048A CN A2009101079490 A CNA2009101079490 A CN A2009101079490A CN 200910107949 A CN200910107949 A CN 200910107949A CN 101583048 A CN101583048 A CN 101583048A
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Abstract
The invention discloses a signal detection device of a VGA channel, and the signal detection device comprises a television MCU, a VGA terminal for connecting an external VGA signal source and receiving VGA signals, a VGA line synchronous signal processing circuit for converting VGA line synchronous signals to VGA detection signals, and a VGA field synchronous signal processing circuit for converting VGA field synchronous signals to the VGA detection signals, wherein the television MCU is used for receiving the VGA detection signals and judging whether the VGA channel has the VGA signals or not. The signal detection device of the VGA channel has the advantages of simple structure and low cost, and the signal detection device can stably and reliably detect the signal state of the VGA channel of a television and can be applied to a variety of VGA terminal-based application occasions.
Description
[technical field]
The present invention relates to technical field of television sets, particularly a kind of signal supervisory instrument of VGA passage.
[background technology]
The equipment that abundant day by day along with electronic product, computer, set-top box, video on-demand system etc. have the output of VGA signal has also been come into people's life.At present, liquid crystal TV set also provides the VGA interface, and like this, we just can be connected above-mentioned electronic equipment with television set.Along with LCD TV replaces traditional C RT TV gradually, the VGA interface becomes more and more important, particularly small size liquid crystal TV sets such as 22,26 often by people as computer monitor, the VGA interface is even more important, people urgently wish to realize various functions by the VGA interface.For example: the user crosses the VGA interface with the computer expert and links to each other with television set, sees the content of computer for more people; VOD system is linked to each other with television set, realize the broadcast of user's requesting song etc.In order to realize the demand of various VGA functions, television set mainly adopts special chip that the VGA signal is handled at present, perhaps directly row, the field synchronization of VGA signal is stored, analyzes and handle by TV MCU.Yet, above processing mode cost height, and very complicated, technical difficulty is big.
[summary of the invention]
For addressing the above problem, main purpose of the present invention is to provide the signal supervisory instrument of low, the reliable and stable VGA passage of a kind of cost.
For achieving the above object, technical scheme of the present invention is:
A kind of signal supervisory instrument of VGA passage, the VGA terminal that include TV MCU, is used to connect outside VGA signal source and receive the VGA signal, be used for VGA field sync signal treatment circuit that the VGA line synchronizing signal is converted to the VGA line synchronizing signal treatment circuit of VGA detection signal and is used for the VGA field sync signal is converted to the VGA detection signal, described TV MCU is used to receive the VGA detection signal to judge whether television set VGA passage has the VGA signal.
Compared to prior art, the signal supervisory instrument of VGA passage of the present invention is made up of VGA terminal, VGA line synchronizing signal treatment circuit, VGA field sync signal treatment circuit and TV MCU, simple in structure, cost is low, the signal condition of television set VGA passage can be reliablely and stablely detected, and multiple application scenario can be applied to based on the VGA terminal.
[description of drawings]
Fig. 1 is the circuit theory diagrams of the signal supervisory instrument of VGA passage of the present invention.
Fig. 2 is the waveform diagram of row of the present invention, field sync signal and row bidirectional diode the 3rd pin.
[embodiment]
See also shown in Figure 1, the signal supervisory instrument of a kind of VGA passage of the present invention, include the VGA terminal that is used to connect outside VGA signal source and receive the VGA signal, be used for the VGA line synchronizing signal convert to the VGA detection signal VGA line synchronizing signal treatment circuit, be used for converting the VGA field sync signal VGA field sync signal treatment circuit of VGA detection signal to and being used to receive the VGA detection signal to judge whether television set VGA passage has the TV MCU of VGA signal.
13,14 pin of VGA terminal are respectively the synchronous and field sync signal input pin of row of VGA signal, connect VGA line synchronizing signal treatment circuit and VGA field sync signal treatment circuit respectively.When the VGA passage has the signal input, the line synchronizing signal VGA_HIN of VGA terminal the 13rd pin and the field sync signal VGA_VIN of the 14th pin are square-wave signal, waveform is shown in Fig. 2 a, and high and low level is expressed as A, B respectively, and the high-low level voltage difference is that the amplitude between A, the B is 5V.
VGA line synchronizing signal treatment circuit includes row first capacitor C 114, the capable bidirectional diode D101 that is connected with row first capacitor C 114 and row triode Q100.Wherein, row bidirectional diode D101 has three pin, and its 3rd pin is public pin, link to each other with row first capacitor C 114, and the 1st pin ground connection, and the 2nd pin is connected to the base stage of capable triode Q100.Be connected to capable earth resistance R121 and row ground capacity C116 between row bidirectional diode Q101 and the row triode Q100 respectively, the grounded collector of row triode Q100, emitter is connected to TV MCU, in addition, television set provide+5V connects the emitter of row triode Q100 by row first resistance R 116.Should+5V voltage is the standby voltage that television set provides, and no matter television set is in the normal boot-strap state still is in holding state, and its voltage exists always.Row first capacitor C 114 is a coupling capacitance, and row ground capacity C116 is a storage capacitor.When the VGA passage has the signal input, line synchronizing signal VGA_HIN be square-wave signal shown in Fig. 2 a: when the A level arrives, conducting between 3 pin of row bidirectional diode D101 and 2 pin, because the resistance value of row earth resistance R121 is very big, row coupling capacitance C114 charging is very slow; When the B level arrives, end between 3 pin of row bidirectional diode D101 and 2 pin, because the clamping action of row bidirectional diode D101 makes that the level of row bidirectional diode D101 the 3rd pin is 0V substantially.Line synchronizing signal VGA_HIN makes the square wave of waveform shown in Fig. 2 b of the 3rd pin of row bidirectional diode D101 after the processing of space first capacitor C 114, row bidirectional diode D101 and row earth resistance R121, wherein the D level is 0V, and the C level is+5V.When the A of line synchronizing signal VGA_HIN level arrived, row bidirectional diode D101 the 3rd pin was the C level, promptly+5V, conducting between 3 pin of row bidirectional diode D101 and 2 pin, row ground capacity C116 quick charge extremely+5V; When the B of line synchronizing signal VGA_HIN level arrived, the 3rd pin of row bidirectional diode D101 was C level, i.e. 0V; end between 3 pin of row bidirectional diode D101 and 2 pin; because row earth resistance R121 resistance value is very big, row ground capacity C116 discharge is very slow, its+5V voltage is constant substantially.Therefore during the VGA passage had signal, the base stage of row triode Q100 was always+5V voltage, and row triode Q100 ends, and then emitter voltage is+5V voltage, and promptly VGA detection signal VGA_DET is+the 5V high level.During the VGA passage does not have the signal input, the base stage of row triode Q100 is always 0V voltage, row triode Q100 saturation conduction, then emitter voltage is a 0V voltage, be that VGA detection signal VGA_DET is the 0V low level, row first resistance R 116 is big resistance, and the electric current that flow through capable triode Q100 this moment is very little, and the electric energy of consumption seldom.
Capable first capacitor C 117, the field bidirectional diode D102 that is connected with first capacitor C 117 and the triode Q101 of including of VGA field sync signal treatment circuit.Wherein, a bidirectional diode D102 has three pin, and its 3rd pin is public pin, link to each other with field first capacitor C 117, and the 1st pin ground connection, and the 2nd pin is connected to the base stage of triode Q101.Be connected to an earth resistance R126 and a ground capacity C118 between a field bidirectional diode Q102 and the triode Q101 respectively, the grounded collector of field triode Q101, emitter is connected to TV MCU, in addition, television set provide+5V connects the emitter of triode Q101 by first resistance R 125.Field first capacitor C 117 is a coupling capacitance, and a ground capacity C118 is a storage capacitor.When the VGA passage had the signal input, field sync signal VGA_VIN is the same with line synchronizing signal VGA_HIN to be square wave, and just the cycle of field sync signal VGA_VIN period ratio line synchronizing signal VGA_HIN is long.The same with VGA line synchronizing signal treatment circuit principle, during VGA has signal input, the emission of a triode Q101 very+5V voltage, promptly VGA detection signal VGA_DET is+the 5V high level; And during the VGA passage did not have the signal input, the emitter voltage of a triode Q101 was a 0V voltage, and promptly VGA detection signal VGA_DET is the 0V low level, and it is very little to flow through the electric current of triode Q101, and the electric energy of consumption seldom.
VGA detection signal VGA_DET links to each other with the I/O mouth P1 of TV MCU, and TV MCU passes through to detect the state of I/O mouth P1, thereby detects the signal condition of VGA passage.As shown in table 1 below is the corresponding relation of the signal condition of the logic state of VGA detection signal VGA_DET of the present invention and VGA passage.
Wherein, " 0 " expression VGA_DET is the 0V low level, and " 1 " expression VGA_DET is+the 5V high level.VGA_DET is " 0 ", and this moment, the VGA passage did not have the signal input; VGA_DET jumps to " 1 " from " 0 ", and this moment, the VGA passage had signal to insert to be the VGA passage to transfer to immediately from no signal the signal input is arranged; VGA_DET is " 1 ", and this moment, the VGA passage had the signal input; VGA_DET jumps to " 0 " from " 1 ", and VGA channel signal disconnection this moment is that the VGA passage transfers the no signal input to immediately from the signal input is arranged.
In actual applications, utilize this creation to realize the automatic switching function of VGA passage, when television set normally moves, when VGA_DET when " 0 " jumps to " 1 ", if television set when prepass be not VGA passage then television set automatically switches to the VGA passage; When VGA_DET when " 1 " jumps to " 0 ", if television set when prepass be VGA passage then television set automatically switches to the TV passage, if television set when prepass be not VGA passage then television set does not carry out passage switches.And when VGA_DET was " 0 " or " 1 ", its passage handoff functionality was the normal general function of television set.
Utilize this creation to realize the automatic switching function of VGA passage, when television set is in holding state, when VGA_DET when " 0 " jumps to " 1 ", the television set Auto Power On also automatically switches to the VGA passage with passage.And television set is when being in normal operation, when VGA_DET from " 1 " jump to " 0 " and television set when prepass be then television set automatic stand-by of VGA passage, when VGA_DET from " 1 " jump to " 0 " and television set when prepass be not that then the television set state is constant for the VGA passage.And when VGA_DET was " 0 " or " 1 ", television function was the normal general function of television set.
In sum, the signal supervisory instrument of a kind of VGA passage of the present invention can reliablely and stablely detect the signal condition of VGA passage, realizes the various functions of television set, has great practical value.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (7)
1. the signal supervisory instrument of a VGA passage, include TV MCU and be used to connect outside VGA signal source and receive the VGA terminal of VGA signal, it is characterized in that: also include and be used for VGA field sync signal treatment circuit that the VGA line synchronizing signal is converted to the VGA line synchronizing signal treatment circuit of VGA detection signal and is used for the VGA field sync signal is converted to the VGA detection signal, described TV MCU is used to receive the VGA detection signal to judge whether television set VGA passage has the VGA signal.
2. the signal supervisory instrument of VGA passage as claimed in claim 1 is characterized in that: described VGA line synchronizing signal treatment circuit includes row first electric capacity (C114), the capable bidirectional diode (D101) that is connected with row first electric capacity (C114) and row triode (Q100).
3. the signal supervisory instrument of VGA passage as claimed in claim 2, it is characterized in that: be connected to capable earth resistance (R121) and row ground capacity (C116) between described capable bidirectional diode (Q101) and the row triode (Q100) respectively, the grounded collector of row triode (Q100), emitter is connected to TV MCU.
4. the signal supervisory instrument of VGA passage as claimed in claim 3, it is characterized in that: described capable bidirectional diode (D101) has three pin, and its 3rd pin is public pin, with row first electric capacity (C114), the 1st pin ground connection, and the 2nd pin is connected to the base stage of capable triode (Q100).
5. the signal supervisory instrument of VGA passage as claimed in claim 4 is characterized in that: a capable field bidirectional diode (D102) and the triode (Q101) that includes first electric capacity (C117), is connected with first electric capacity (C117) of described VGA field sync signal treatment circuit.
6. the signal supervisory instrument of VGA passage as claimed in claim 5, it is characterized in that: be connected to an earth resistance (R126) and a ground capacity (C118) respectively between a described field bidirectional diode (Q102) and the triode (Q101), the grounded collector of field triode (Q101), emitter is connected to TV MCU.
7. the signal supervisory instrument of VGA passage as claimed in claim 6, it is characterized in that: described bidirectional diode (D102) has three pin, and its 3rd pin is public pin, with field first electric capacity (C117), the 1st pin ground connection, and the 2nd pin is connected to the base stage of a triode (Q101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101079490A CN101583048B (en) | 2009-06-12 | 2009-06-12 | Signal detection device of VGA channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101079490A CN101583048B (en) | 2009-06-12 | 2009-06-12 | Signal detection device of VGA channel |
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| CN101583048A true CN101583048A (en) | 2009-11-18 |
| CN101583048B CN101583048B (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101079490A Expired - Fee Related CN101583048B (en) | 2009-06-12 | 2009-06-12 | Signal detection device of VGA channel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843575A (en) * | 2011-06-22 | 2012-12-26 | 鸿富锦精密工业（深圳）有限公司 | VGA (Video Graphics Array) port test device and test method thereof |
| CN103731662A (en) * | 2013-11-27 | 2014-04-16 | 乐视致新电子科技（天津）有限公司 | Display device and method capable of prompting VGA signal source states |
| CN104125454A (en) * | 2013-04-29 | 2014-10-29 | 广州市北域电子科技有限公司 | VGA signal detection circuit and method |
| CN104469352A (en) * | 2014-12-12 | 2015-03-25 | 龙迅半导体科技(合肥)有限公司 | Input signal state detecting circuit, signal converting system and playing device |
| CN104717489A (en) * | 2013-12-13 | 2015-06-17 | 致茂电子股份有限公司 | Detecting device for detecting video device and control method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148057C (en) * | 2000-02-04 | 2004-04-28 | 海信集团公司 | TV set compatible with VGA display |
| CN2596695Y (en) * | 2003-01-01 | 2003-12-31 | 青岛海信电器股份有限公司 | Switching circuit of TV and RGB of VGA signal and line-field synchronous signals |
| CN101150689B (en) * | 2007-10-25 | 2011-05-25 | 康佳集团股份有限公司 | Method and circuit for realizing LCD TV VGA arousing function |
-
2009
- 2009-06-12 CN CN2009101079490A patent/CN101583048B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843575A (en) * | 2011-06-22 | 2012-12-26 | 鸿富锦精密工业（深圳）有限公司 | VGA (Video Graphics Array) port test device and test method thereof |
| CN104125454A (en) * | 2013-04-29 | 2014-10-29 | 广州市北域电子科技有限公司 | VGA signal detection circuit and method |
| CN103731662A (en) * | 2013-11-27 | 2014-04-16 | 乐视致新电子科技（天津）有限公司 | Display device and method capable of prompting VGA signal source states |
| CN103731662B (en) * | 2013-11-27 | 2016-05-11 | 乐视致新电子科技（天津）有限公司 | A kind of display unit and method of pointing out VGA signal source state |
| CN104717489A (en) * | 2013-12-13 | 2015-06-17 | 致茂电子股份有限公司 | Detecting device for detecting video device and control method thereof |
| CN104717489B (en) * | 2013-12-13 | 2017-04-12 | 致茂电子股份有限公司 | detecting device for detecting video device and control method thereof |
| CN104469352A (en) * | 2014-12-12 | 2015-03-25 | 龙迅半导体科技(合肥)有限公司 | Input signal state detecting circuit, signal converting system and playing device |
| CN104469352B (en) * | 2014-12-12 | 2017-08-11 | 龙迅半导体（合肥）股份有限公司 | A kind of status input signal detection circuit, signal translating system and playback equipment |
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|---|---|
| CN101583048B (en) | 2012-06-06 |
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Application publication date: 20091118 Assignee: Chuangwei Quanxin Safety and Protection Science and Technology Co., Ltd., Shenzh Assignor: Shenzhen Skyworth-RGB Electronics Co., Ltd. Contract record no.: 2013440020002 Denomination of invention: Signal detection device of VGA channel Granted publication date: 20120606 License type: Exclusive License Record date: 20130114 |
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Assignee: Chuangwei Quanxin Safety and Protection Science and Technology Co., Ltd., Shenzh Assignor: Shenzhen Skyworth-RGB Electronics Co., Ltd. Contract record no.: 2013440020002 Date of cancellation: 20160412 |
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