CN101426117A - Automatic detection device for display input signal source and method therefor - Google Patents
Automatic detection device for display input signal source and method therefor Download PDFInfo
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- CN101426117A CN101426117A CNA2007101692029A CN200710169202A CN101426117A CN 101426117 A CN101426117 A CN 101426117A CN A2007101692029 A CNA2007101692029 A CN A2007101692029A CN 200710169202 A CN200710169202 A CN 200710169202A CN 101426117 A CN101426117 A CN 101426117A
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Abstract
An automatic detecting device and method of input signal source of a display. The device mainly includes a voltage source, a micro-controller, an input signal source, a voltage-dividing circuit, as well as an operational amplifier, wherein, each node of each voltage-dividing circuit is respectively connected to each input terminal of the input signal source, when the display receives the input signal source, the output terminal potential of the operational amplifier connected to the input signal source will change, a microcontroller is connected to the output terminal of the operational amplifier for detecting the current received input signal source. When the device is used for watching television, it can automatically detect the input signal source without self switching of the user. So that the invention can not only enhance facilitation in use but also can reduce fabricating cost.
Description
Technical field
The invention relates to a kind of automatic detection device and method thereof of input signal source of display, refer to a kind of especially by judging the automatic detection device and the method thereof of operational amplifier output voltage variation with the input signal source of the display of Auto-Sensing input signal source.
Background technology
With regard to the kind that use principle is distinguished display, what tradition was common is cathode ray tube (Cathode Ray Tube) display, the input signal source of cathode-ray tube display has Video and S-Video, and the mode of switching adopts remote controller to select menu or remote controller fast key.
Yet, progress along with science and technology, the use of LCD TV is more and more general, and the receivable input signal source of LCD TV also increases than in the past, for example universal gradually high resolution multimedia interface (High-definition Multimedia Interface, HDMI) signal source, so-called HDMI is the transmission terminal of being opened at next generation multimedia video equipment, is applicable to Digital Television, DVD projector, DVD videocorder, PVR, video converter (Set-top Box) and other digital audio-video commodity of digital household appliances.Greatest feature is that the image and the sound of integrated signal together transmits, and is different with the audio-visual separated transmission of tradition; Adopt the numerical data transmission of non-compression, can effectively reduce the signal that is caused in numeral and the analog-converted and disturb and decay, maximum transfer speed can reach 5GB/s, except that image data, more can transmit the audio signal up to 8 sound channels simultaneously, be indispensable multimedia terminal in time generation digital product.
The input signal source of other kind also comprises composite signal (Video), separation signal (S-Video), Computer signal (VGA), color difference signal (YPbPr) or the like, but the mode of switching still adopts remote controller to select menu or remote controller fast key, the user needs to switch with remote controller, just can watch this input signal source, this measure is very inconvenience for the user.
Summary of the invention
Inconvenience based on the above-mentioned use that causes on switching channels, main purpose of the present invention is the automatic detection device at the input signal source that a kind of display is provided, when automatic detection device detects newly-increased input signal, promptly automatically switch to newly-increased input signal source, therefore, when being used to watch TV, but Auto-Sensing input signal source and do not need the user to switch voluntarily can to view and admire rating.
Another object of the present invention so that can whether receive newly-increased input signal by automatically detecting display, and when receiving newly-increased input signal, automatically switches to newly-increased input signal source at the automatic detection method of the input signal source that a kind of display is provided.
For reaching above-mentioned purpose, the invention provides a kind of automatic detection device of input signal source of display, it is characterized in that, mainly comprise:
At least one voltage source;
One microcontroller;
At least one input signal source;
At least one bleeder circuit, an end of this bleeder circuit is connected to this voltage source, and the other end is connected to earth potential; And
At least one operational amplifier, respectively a first input end of this operational amplifier connects this at least one input signal source, respectively an output of this operational amplifier has input signal source detecting terminal respectively, and respectively this input signal source detecting terminal is connected at least one detecting pin of this microcontroller respectively;
Wherein, this bleeder circuit is in order to a reference voltage and an input voltage are provided respectively to respectively one second input and this first input end of this operational amplifier, this microcontroller basis is the change state of this input signal source detecting terminal voltage quasi position height respectively, Auto-Sensing and the input signal source that switches this display.
Wherein, this first input end is the inverting input of this operational amplifier respectively.
Wherein, this second input is the normal phase input end of this operational amplifier respectively.
Wherein also comprise at least one electric capacity, respectively an end of this electric capacity is connected to respectively this output of this operational amplifier respectively, and the other end is connected to earth potential respectively.
Wherein also comprise at least one filter capacitor, respectively an end of this filter capacitor is connected to respectively this input signal source respectively, and the other end is connected to respectively this first input end of this operational amplifier respectively.
Wherein this bleeder circuit comprises one first resistance, one second resistance and one the 3rd resistance, be connected in series mutually with a first node between this first resistance and this second resistance, be connected in series mutually with a Section Point between this second resistance and the 3rd resistance, the current potential of this first node is this reference voltage, and the current potential of this Section Point is this input voltage.
Wherein the current potential of this reference voltage is greater than current potential 70 millivolts of this input voltage.
Wherein, this input signal source comprises at least one high resolution multimedia interface signal source.
Wherein, this input signal source comprises at least one DVI interface signal source.
Wherein, this input signal source comprises at least one complex sources, at least one separation signal source, at least one color difference signal source and at least one Computer signal source.
Wherein, this voltage source provides one 3 volts to 6 volts voltage.
Wherein, respectively a positive power source terminal of this operational amplifier is connected to this voltage source.
Wherein, respectively a negative power end of this operational amplifier is connected to earth potential.
Wherein, this display is a LCD.
Wherein, this display is a cathode-ray tube display.
Wherein, the detecting pin of this microcontroller is a general input and output pin.
Wherein, also comprise at least one the 4th resistance, respectively an end of the 4th resistance connects the respectively Section Point of this bleeder circuit, and the other end connects respectively this first input end of this operational amplifier.
Wherein, also comprise at least one the 5th resistance, respectively the 5th resistance one end connects respectively this output of this operational amplifier, and the other end connects one second voltage source.
Wherein, also comprise at least one the 6th resistance, respectively an end of the 6th resistance connects respectively this output of this operational amplifier, and the other end connects respectively this input signal source detecting terminal.
The present invention also provides a kind of automatic detection method of input signal source of display, it is characterized in that, the method includes the steps of:
(A) provide an input signal source;
(B) detect the voltage quasi position that each input signal source is detected terminal; And
(C), judge whether to receive a newly-increased input signal source, if then switch to this newly-increased input signal source and return step (B) according to the voltage quasi position state of each input signal source detecting terminal.
Wherein, in step (C), when reception should not increase input signal source newly, carry out a step (D):
Whether detecting exists this input signal source at present, if not, then carries out power saving action, if then return step (B).
Wherein, this input signal source comprises a complex sources, a separation signal source, a color difference signal source and a Computer signal source.
Wherein, this display is a LCD.
Wherein, this display is a cathode-ray tube display.
Wherein, this input signal source comprises at least one high resolution multimedia interface signal source.
Description of drawings
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment of the present invention cited below particularly, and conjunction with figs. are described in detail below, wherein:
Fig. 1 is the LCD TV and the signal source Auto-Sensing Organization Chart of a preferred embodiment of the present invention.
Fig. 2 A is the automatic detection device circuit diagram in the display input signals source of a preferred embodiment of the present invention.
Fig. 2 B is the automatic detection device partial circuit diagram in the display input signals source of a preferred embodiment of the present invention.
Fig. 3 is microcontroller circuit figure in the automatic detection device in display input signals source of a preferred embodiment of the present invention.
Fig. 4 is the display input signals source automatic detection method flow chart of a preferred embodiment of the present invention.
Embodiment
See also Fig. 1, Fig. 1 is the LCD TV and the signal source Auto-Sensing Organization Chart of a preferred embodiment of the present invention.LCD TV has a plurality of input signal sources: TV signal source 101 (TV-Signal), complex sources 103 (Video), separation signal source 105 (S-Video), color difference signal source 107 (YPbPr), above signal source is connected respectively to Video Decoder 109 and audio decoder 111.Computer signal source 113 (VGA) is connected to analog-digital converter/HDMI interface 117 with high resolution multimedia interface (HDMI) signal source 115.Audio decoder 111 amplifies the audio frequency of decipher by audio frequency expander 119 (Audio AMP), broadcasted by loudspeaker at last, and the video of decipher then is adjusted to proper proportion by video sealer 121 (Scaler) and is broadcasted by panel 123 (Panel).Microcontroller 125 (MCU) connects infrared receiver 127 (IR Pad), key groups 129 (KeyPad) and programmable read only memory 131 (E2 PROM), infrared receiver 127 receives remote controller signal, microcontroller 125 pins move to the received signal, key groups 129 provides switching on and shutting down, adjusts basic functions such as channel and volume, and programmable read only memory 131 is responsible for storing data.Chip (5V) and panel (24V) are given in power supply module 133 (Power Model) power supply, and microcontroller 125 may command electric pressure converters 135 (Inverter) change panel luminance.
The present invention is connected to signal sensing device 137 (Signal Detector) with each signal source, when signal sensing device 137 detects the new signal input, to detect the result and be sent to microcontroller 125, microcontroller 125 can automatically switch to new signal source, and the user does not need to carry out extra change action voluntarily can view and admire rating.Significantly increase the convenience on using.
Fig. 2 A is the automatic detection device circuit diagram in the display input signals source of a preferred embodiment of the present invention, and the automatic detection device in display input signals source comprises: voltage source V CC1 and VCC2, input signal source S1-S4, resistance R 1-R6, filter capacitor C1 and capacitor C 2, operational amplifier U1-U4 and bleeder circuit 201.The output of operational amplifier U1-U4 has input signal source detecting terminal D1-D4 respectively, and what input signal source detecting terminal D1-D4 was connected to microcontroller 125 respectively respectively detects pin.Wherein, input signal source S1-S4 is contained numerous species, for example high resolution multimedia interface (HDMI), complex sources (Video), separation signal source (S-Video), color difference signal source (YPbPr), Computer signal source (VGA), DVI interface signal etc., resistance R 2 is concatenated into a bleeder circuit 201 with resistance R 3 with node N2 to resistance R 1 mutually with node N1 with resistance R 2, bleeder circuit 201 1 ends are connected to voltage source V CC1, and the other end is connected to earth potential.
The inverting input of each operational amplifier U1-U4 connects input signal source S1-S4 respectively, and the positive power source terminal of operational amplifier U1-U4 is connected to voltage source V CC1, and the negative power end of operational amplifier U1-U4 is connected to earth potential.
The automatic detection device in display input signals source also comprises filter capacitor C1 and capacitor C 2 in the present embodiment, and the end of each filter capacitor C1 is connected to input signal source S1-S4 respectively, and the other end is connected to the inverting input of operational amplifier U1-U4 respectively.One end of each capacitor C 2 is the output of concatenation operation amplifier U1-U4 respectively, and the other end is connected to earth potential respectively.
The automatic detection device in display input signals source also comprises resistance R 4, resistance R 5 and resistance R 6 in the present embodiment, and an end of resistance R 4 connects the node N2 of each bleeder circuit 201, and the other end connects the inverting input of each operational amplifier U1-U4.The output of resistance R 5 one end concatenation operation amplifier U1-U4, the other end connects a voltage source V CC2.The output of resistance R 6 one end concatenation operation amplifier U1-U4, the other end connect input signal source detecting terminal D1-D4.
For instance, when not receiving input signal source S2, the normal phase input end current potential of operational amplifier U2 will be higher than the inverting input current potential, when receiving input signal source S2, the inverting input current potential of operational amplifier U2 will be higher than the normal phase input end current potential, therefore the accurate position of the output end voltage of operational amplifier U2 just can change to the accurate position of low-voltage by the accurate position of high voltage, microcontroller 125 is according to the change of input signal source detecting terminal D2 voltage quasi position height, and Auto-Sensing goes out to receive input signal source S2.Display for example is LCD, cathode-ray tube display, and the detecting pin of microcontroller for example is general input and output pin.
For further specifying, see also Fig. 2 B, Fig. 2 B is the automatic detection device partial circuit diagram in the display input signals source of a preferred embodiment of the present invention, comprises voltage source V CC1 and voltage source V CC2, input signal source S1, resistance R 1-R3, operational amplifier U1, bleeder circuit 201 and microcontroller 203.The output of operational amplifier U1 has input signal source detecting terminal D1, input signal source detecting terminal D1 is connected to the detecting pin of microcontroller 203, bleeder circuit 201 1 ends are connected to voltage source V CC1 (in the present embodiment being 5 volts), and the other end is connected to earth potential.
Fig. 3 is the microcontroller circuit figure of automatic detection device in the display input signals source of a preferred embodiment of the present invention, input signal source detecting terminal D1-D6 connects the part detecting pin (for example general input and output pin) of microcontroller respectively, microcontroller is according to the state of input signal source detecting terminal D1-D6 voltage quasi position height, the input signal source of automatically detecting display.When signal is imported, the operational amplifier that its signal input sources connected is output as low-potential voltage, the microcontroller external interrupt will be triggered in the analog digital conversion pin position (ADC) that connects microcontroller this moment, and this interrupt handling routine will be judged the input of signal and carry out the signal source change action.
Fig. 4 is the display input signals source automatic detection method flow chart of a preferred embodiment of the present invention, comprises following steps: input signal source (step S401) is provided; The voltage quasi position (step S403) of detecting input signal source detecting terminal; And, judge whether to receive a newly-increased input signal source (step S405), if then switch to newly-increased input signal source (step S407) and return step S403 according to the voltage quasi position state of each input signal source detecting terminal.
If in step S405, when not detecting newly-increased input signal source, i.e. whether detecting exists input signal source (step S409) at present, if not, then carries out power saving action (step S411), if, then return step S403, continue the detecting input signal source.
Wherein, each input signal source comprises complex sources, separation signal source, color difference signal source and Computer signal source, or high resolution multimedia interface (HDMI) signal source.Display is LCD or cathode-ray tube display.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that the claim scope is described certainly, but not only limits to the foregoing description.
Claims (25)
1. the automatic detection device of the input signal source of a display is characterized in that, mainly comprises:
At least one voltage source;
One microcontroller;
At least one input signal source;
At least one bleeder circuit, an end of this bleeder circuit is connected to this voltage source, and the other end is connected to earth potential; And
At least one operational amplifier, respectively a first input end of this operational amplifier connects this at least one input signal source, respectively an output of this operational amplifier has input signal source detecting terminal respectively, and respectively this input signal source detecting terminal is connected at least one detecting pin of this microcontroller respectively;
Wherein, this bleeder circuit is in order to a reference voltage and an input voltage are provided respectively to respectively one second input and this first input end of this operational amplifier, this microcontroller basis is the change state of this input signal source detecting terminal voltage quasi position height respectively, Auto-Sensing and the input signal source that switches this display.
2. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this first input end is the inverting input of this operational amplifier respectively.
3. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this second input is the normal phase input end of this operational amplifier respectively.
4. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein also comprises at least one electric capacity, and respectively an end of this electric capacity is connected to respectively this output of this operational amplifier respectively, and the other end is connected to earth potential respectively.
5. the automatic detection device of the input signal source of display as claimed in claim 1, it is characterized in that, wherein also comprise at least one filter capacitor, respectively an end of this filter capacitor is connected to respectively this input signal source respectively, and the other end is connected to respectively this first input end of this operational amplifier respectively.
6. the automatic detection device of the input signal source of display as claimed in claim 1, it is characterized in that, wherein this bleeder circuit comprises one first resistance, one second resistance and one the 3rd resistance, be connected in series mutually with a first node between this first resistance and this second resistance, be connected in series mutually with a Section Point between this second resistance and the 3rd resistance, the current potential of this first node is this reference voltage, and the current potential of this Section Point is this input voltage.
7. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein the current potential of this reference voltage is greater than current potential 70 millivolts of this input voltage.
8. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this input signal source comprises at least one high resolution multimedia interface signal source.
9. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this input signal source comprises at least one DVI interface signal source.
10. the automatic detection device of the input signal source of display as claimed in claim 1, it is characterized in that, wherein, this input signal source comprises at least one complex sources, at least one separation signal source, at least one color difference signal source and at least one Computer signal source.
11. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this voltage source provides one 3 volts to 6 volts voltage.
12. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, respectively a positive power source terminal of this operational amplifier is connected to this voltage source.
13. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, respectively a negative power end of this operational amplifier is connected to earth potential.
14. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this display is a LCD.
15. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, this display is a cathode-ray tube display.
16. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, the detecting pin of this microcontroller is a general input and output pin.
17. the automatic detection device of the input signal source of display as claimed in claim 1, it is characterized in that, wherein, also comprise at least one the 4th resistance, respectively an end of the 4th resistance connects the respectively Section Point of this bleeder circuit, and the other end connects respectively this first input end of this operational amplifier.
18. the automatic detection device of the input signal source of display as claimed in claim 1 is characterized in that, wherein, also comprises at least one the 5th resistance, respectively the 5th resistance one end connects respectively this output of this operational amplifier, and the other end connects one second voltage source.
19. the automatic detection device of the input signal source of display as claimed in claim 1, it is characterized in that, wherein, also comprise at least one the 6th resistance, respectively an end of the 6th resistance connects respectively this output of this operational amplifier, and the other end connects respectively this input signal source detecting terminal.
20. the automatic detection method of the input signal source of a display is characterized in that, the method includes the steps of:
(A) provide an input signal source;
(B) detect the voltage quasi position that each input signal source is detected terminal; And
(C), judge whether to receive a newly-increased input signal source, if then switch to this newly-increased input signal source and return step (B) according to the voltage quasi position state of each input signal source detecting terminal.
21. the automatic detection method of input signal source as claimed in claim 20 is characterized in that, wherein, in step (C), when reception should not increase input signal source newly, carries out a step (D):
Whether detecting exists this input signal source at present, if not, then carries out power saving action, if then return step (B).
22. the automatic detection method of input signal source as claimed in claim 20 is characterized in that, wherein, this input signal source comprises a complex sources, a separation signal source, a color difference signal source and a Computer signal source.
23. the automatic detection method of input signal source as claimed in claim 20 is characterized in that, wherein, this display is a LCD.
24. the automatic detection method of input signal source as claimed in claim 20 is characterized in that, wherein, this display is a cathode-ray tube display.
25. the automatic detection method of input signal source as claimed in claim 20 is characterized in that, wherein, this input signal source comprises at least one high resolution multimedia interface signal source.
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| CNA2007101692029A CN101426117A (en) | 2007-11-02 | 2007-11-02 | Automatic detection device for display input signal source and method therefor |
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| CNA2007101692029A CN101426117A (en) | 2007-11-02 | 2007-11-02 | Automatic detection device for display input signal source and method therefor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055943B (en) * | 2009-10-28 | 2013-10-23 | 纬创资通股份有限公司 | Detection method, detection device and multimedia device |
| CN103428527A (en) * | 2013-08-08 | 2013-12-04 | 北京宽客网络技术有限公司 | Real-time data source media stream transformation method and breakpoint switching play method |
| CN103685984A (en) * | 2013-12-30 | 2014-03-26 | 天津三星电子有限公司 | Video signal source automatic switching method and television |
| CN103902395A (en) * | 2012-12-28 | 2014-07-02 | 联想(北京)有限公司 | Information input control method and electronic terminal |
| TWI498721B (en) * | 2013-06-21 | 2015-09-01 | Top Victory Invest Ltd | Method for power saving of display having auto source detection function |
| CN112040307A (en) * | 2020-08-24 | 2020-12-04 | 海信视像科技股份有限公司 | Play control method and display device |
-
2007
- 2007-11-02 CN CNA2007101692029A patent/CN101426117A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055943B (en) * | 2009-10-28 | 2013-10-23 | 纬创资通股份有限公司 | Detection method, detection device and multimedia device |
| CN103902395A (en) * | 2012-12-28 | 2014-07-02 | 联想(北京)有限公司 | Information input control method and electronic terminal |
| CN103902395B (en) * | 2012-12-28 | 2017-11-28 | 联想(北京)有限公司 | The control method and electric terminal of information input |
| TWI498721B (en) * | 2013-06-21 | 2015-09-01 | Top Victory Invest Ltd | Method for power saving of display having auto source detection function |
| CN103428527A (en) * | 2013-08-08 | 2013-12-04 | 北京宽客网络技术有限公司 | Real-time data source media stream transformation method and breakpoint switching play method |
| CN103685984A (en) * | 2013-12-30 | 2014-03-26 | 天津三星电子有限公司 | Video signal source automatic switching method and television |
| CN112040307A (en) * | 2020-08-24 | 2020-12-04 | 海信视像科技股份有限公司 | Play control method and display device |
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