CN102610208B - Displayer system and related control method for the same - Google Patents
Displayer system and related control method for the same Download PDFInfo
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Abstract
The invention relates to a displayer system. The displayer system can be connected to a host, and comprises a display controller, a display end, a display-end engine and a detection circuit. The display end comprises a main linking machine, an auxiliary channel and a detection signal end; the display end engine is connected to the display end through the main linking machine, the auxiliary channel and the detection signal end, and is used for outputting image signals to the display controller; and the detection circuit is connected to the display end via the auxiliary channel, and is used for detecting whether an auxiliary signal pair in the auxiliary channel has a communication signal or not so as to output an indication signal to the display end engine.
Description
Technical field
The present invention is a kind of display system and control method thereof, a when display end interface specification that espespecially adopts from host side when the useful display end interface of display (DisplayPort Interface) is different, can detect and the hot plug display system of host side by display end interface.
Background technology
Early stage display receives simulation VGA (Video Graphic Array) specification signal and then display frame.And this VGA specification signal is to transmit via D-SUB video port.
Day by day universal along with digital video data, is also constantly pushed out in order to the video interface of transmission of digital formula data.1999 the r digital video DVI that proposes (Digital Visual Interface) interface, it is mainly that to be applied to information industry (IT) upper, in order to replace to commonly use, is applied to simulate VGA specification signal.In addition, the digital video HDMI proposing in 2002 (High Definition Multimedia Interface) interface, it is to be mainly applied in consumer electronics industry, in order to replace, commonly uses the analog AV terminal that is applied in consumer electronics industry, S terminal etc.
In order to allow same display can receive the analog of different size or digital video data, generally on single display, all dispose different video interfaces.Refer to Fig. 1, it is a display system block schematic diagram that disposes various video interface.Display system 10 mainly comprises a display controller (displaycontroller) 101, a D-SUB engine (engine) 103, a DVI engine 105, a HDMI engine 107, a D-SUB video end (port) 109, a DVI video end 111 and a HDMI video end 113.
First, once user's wish is used this display system 10 to play a host side (Host, not shown) the analog image data exported, and when this analog image data is exported through the D-SUB video end of host side, user can be connected to the connector (not shown) of D-SUB interface respectively the D-SUB video end of host side and the D-SUB video end 109 of display system 10, the analog VGA signal that host side is sent can be sent to D-SUB engine 103, and produce signal of video signal to display controller 101 in order to show image.In like manner, once user's wish is used this display system 10 to play the digital video data that a host side is exported, and when these digital video data are exported through the DVI video end of host side, user can be connected to the connector (not shown) of a DVI interface respectively the DVI video end of host side and the DVI video end 111 of display system 10, the digital video data that host side is sent can be sent to DVI engine 105, and produce signal of video signal to display controller 101 in order to show image.In like manner, once user's wish is used this display system 10 to play the digital video data that a host side is exported, and when these digital video data are exported through the HDMI video end of host side, user can be connected to the connector of HDMI interface respectively the HDMI video port of host side and the HDMI video end 113 of display system 10, the digital video data that host side is sent can be sent to HDMI engine 107, and produce signal of video signal to display controller 101 in order to show image.
Along with video interface is more and more many, display also must configure more and more video interfaces with different size more, not only causes the increase on cost, the puzzlement that also causes user to use simultaneously.
In order to address the above problem, VESA (Video Electronics Standards Association) in 2005 release can be applied to a new video interface of information industry (IT)/consumer electronics industry (CE) simultaneously, be DisplayPort (DP, display end), in order to replace DVI interface and HDMI interface.With not being both of other video interface maximum, DisplayPort is the standard of an opening, royalty-free, and therefore all companies all can freely add modification and the formulation of VESA and participation DisplayPort interface standard.
Refer to Fig. 2, it is in Di splayPort interface, signalling channel between host side and display (channel) schematic diagram.Host side 20 is all supported DisplayPort interface with display 23, so digital video data can be sent to display port 235, and produces signal of video signal show image on display 23 via the display port engine (not illustrating) in display 23.
In Di splayPort specification, signalling channel consists predominantly of main line (Main Link) and accessory channel (Auxiliary Channel).Main line is responsible for the transmission of image data, belongs to unidirectional output at a high speed.Main line is to consist of the drawing lines (Lane) of 4 groups, and every group of drawing lines all consisted of the circuit of (two) in pairs, and the frequency range of every group of drawing lines can reach 2.7Gbps, and 4 groups amount to 10.8Gbps.In accessory channel, there is an auxiliary signal to (pair), be responsible for the information outside image data, such as status information, control order, audio frequency etc., belong to the two-way communication of low speed, can be used as main line and start to transmit before image data, the communication (communication) that host side 21 and display are 23.Signal in main line and accessory channel is all difference (differential) signal.Moreover, in DisplayPort specification, separately there is a detection signal end in order to output detection signal (SDM).This detection signal (SDM) is mainly used to detect the hot plug (hot-plug detection) of 23 of host side 21 and displays in the DisplayPort of 1.0 versions specification.
In the DisplayPort of 1.0 versions interface, display 23, first by the current potential that detects detection signal (SDM), learns whether heat is inserted (hot-plug) in host side 21 to display 23.If detect display 23 and be heat, insert (hot-plug) in host side 21, host side 21 can be first used as contacting of 23 of host side 21 and displays by the auxiliary signal in accessory channel (Auxiliary Channel) to sending ditch messenger (communication signal) to display 23.After the communication of 23 of host side 21 and displays is set up, host side 21 can transmit image data to display 23 via main line.
Yet, as previously mentioned, DisplayPort interface is the free standard of an opening, can allow all companies freely add VESA and participate in modification and the formulation of DisplayPort standard, the difference of the DisplayPort specification that has therefore caused different editions to detection signal (SDM) definition.Detection signal (SDM) is mainly used to detect the hot plug (hot-plugdetection) between host side and display in the DisplayPort of 1.0 versions specification, and 1.1 or the DisplayPort specification of 1.1a version in, detection signal (SDM) is but used to other function.Therefore, for example, for example, once the specification of the DisplayPort interface that the specification of the DisplayPort interface that host side is used (1.0 versions) is used from display (1.1 or 1.1a version) is different, whether hot plug is in host side can to cause display to learn display by detection signal (SDM).
Summary of the invention
The present invention proposes a kind of display system, can be connected to a main frame, comprises: a display controller; One display end, this display end has main online a, auxiliary channel and a detection signal end; One display end engine,, this auxiliary channel online via this master and this detection signal end are connected to this display end, in order to export a signal of video signal to this display controller; And a testing circuit, via this accessory channel, be connected to this display end, in order to detect in this auxiliary channel an auxiliary signal to the upper ditch messenger that whether occurs, to export an indicator signal to this display end engine.
The present invention proposes a kind of control method of display system, this display system has one second display end that one first display end is connected to a main frame, comprises the following step: in an auxiliary channel of this first display end, obtain the signal difference that an auxiliary signal is right; When this signal difference increases progressively and is greater than first numerical value, produce an indicator signal of one first current potential; And when this signal difference successively decreases and is less than a second value, produce this indicator signal of one second current potential; Wherein, this first numerical value is greater than this second value, and this indicator signal is while being this first current potential, and this auxiliary signal is to exporting a ditch messenger.
For above-mentioned and other side of the present invention is had to better understanding, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below:
Accompanying drawing explanation
Fig. 1 is the conventional display system block schematic diagram that disposes various video interface.
Fig. 2 is in DisplayPort interface, signalling channel schematic diagram between host side and display.
Fig. 3 is according to the block schematic diagram of the display system of the specific embodiment of the invention.
The transfer function schematic diagram that Fig. 4 A illustrate is testing circuit of the present invention.
Fig. 4 B illustrate is the relation between the signal intensity of positive and negative auxiliary signal end and the output signal of testing circuit.
Fig. 5 A is according to the circuit diagram of the testing circuit in the display system of the specific embodiment of the invention.
Fig. 5 B is the truth table that is applied to the signal in testing circuit of the present invention.
Primary clustering symbol description
10,30: display system
101: display controller
103:D-sub engine
105:DVI engine
107:HDMI engine
109:D-sub video end
111:DVI video end
113:HDMI video end
21,32: host side
23: display
235,303,321: display port
301: display port engine
305: testing circuit
315: the first hysteresis comparators
317: the second hysteresis comparators
319:XOR door
Embodiment
For solving different between the DisplayPort version that DisplayPort version that display adopts adopts from host side, and cause display to learn whether heat is inserted (hot-plug) in host side to display by detection signal (SDM), display system of the present invention, the ditch messenger that utilizes auxiliary channel to export, as judging the whether hot foundation that inserts in host side of display.
Refer to Fig. 3, it is the block schematic diagram of the display system 30 in the present invention.Display system 30 in the present invention includes display controller 307, a display end engine 3 01, a display end 303 and a testing circuit 305.Host side 32 includes a display end 321.Auxiliary signal, to being a differential signal, comprises a positive auxiliary signal end (AUX+) and a negative auxiliary signal end (AUX-).The auxiliary signal that host side 32 is sent is to being connected to the input end (IN) of this testing circuit 305 via display end 303.Moreover an output terminal (OUT) of testing circuit 305 is connected to display end engine 3 01, in order to export an indicator signal.
First, when display system 30 is not connected with host side 32, display end port 303 cannot receive ditch messenger by auxiliary channel.Now, auxiliary signal to upper be noise.When display system 30 is connected in after host side 32, in host side 32, via main line, transmit before image data, host side 32 can be first sends via this positive auxiliary signal end (AUX+) and this negative auxiliary signal end (AUX-) communication that ditch messenger to display end 303 is used as 30 of host side 32 and display systems.This ditch messenger is monitored by testing circuit 305, in the indicator signal of output terminal (OUT) output device the first current potential to display end engine 3 01.
In this embodiment, display system 30 utilizes the ditch messenger that host side 32 is sent by auxiliary channel to learn whether heat inserts in host side 32 to display system 30.When display system 30 is connected in host side 32, host side 32 starts to send ditch messenger to display end 303, as the communication of 30 of host side 32 and display systems.When the input end (IN) of testing circuit 305 by auxiliary signal on receive after ditch messenger, the output terminal of testing circuit 305 (OUT) gets final product the indicator signal of output device the first current potential, accordingly, display system 30 can learn that hot insert (hot-plug) of display system 30 is in host side 32.
It is an enable signal that indicator signal can be used, in order to activation display end engine 3 01, utilize indicator signal to start display end engine 3 01, make the display end engine 3 01 can be in closed condition when not receiving any signal, to avoid the waste of electric energy, and reach energy-conservation effect.When display system 30 is connected in host side 32, host side 32 starts to send ditch messenger to display end 303, as the communication of 30 of host side 32 and display systems.When the input end (IN) of testing circuit 305 receives after ditch messenger, the indicator signal that the output terminal of testing circuit 305 (OUT) can output device the first current potential, and then start display end engine 3 01.
In another specific embodiment, display controller 307 can constantly learn by all display engines in scanning (scan) display system whether display system is connected in host side.For instance, display controller can first scan D-sub engine, uses and learns whether display system is connected in host side via D-sub interface.If learn, display system is not connected in host side via D-sub interface, and display controller can then scan DVI engine, use and learn whether display system is connected in host side via DVI interface, and by that analogy.The indicator signal that display system 30 can be exported by the output terminal (OUT) of display controller 307 scanning detecting circuits 305, learns whether display system 30 is connected in host side 32 via display end 303.That is, if display controller 307 scans indicator signal, be the first current potential, display controller 307 can learn that display system 30 is connected in host side 32 via display end 303; Otherwise, if it is the second current potential that display controller 307 scans indicator signal, display controller 307 can learn that display system 30 is not connected in host side 32 via display end 303, and sequentially scanning other engine, display controller 307 can learn whether display system 30 is connected in host side 32 via display end 303 fast.
Please refer to Fig. 4 A, the transfer function that its illustrate is testing circuit of the present invention (transfer function) schematic diagram.VI is the absolute value of the voltage difference between positive auxiliary signal end (AUX+) and negative auxiliary signal end (AUX-), that is:
VI＝|(AUX+)-(AUX-)|
Transfer function has the characteristic of magnetic hysteresis (hysteresis), and the width of magnetic hysteresis (VOS) is preferably between 20mV and 140mV.Or the width of magnetic hysteresis (VOS) can suitably change, that is 140mV and 20mV can adjust according to actual circuit application.
From Fig. 4 A, when VI is greater than 140mV, the output terminal of testing circuit 305 (OUT) produces noble potential (3.3V), and must wait until that when VI is less than 20mV, the output terminal of testing circuit 305 (OUT) just can produce electronegative potential (0V).And when VI must be greater than 140mV again, the output terminal of testing circuit 305 (OUT) just can produce noble potential (3.3V) again.
Please refer to Fig. 4 B, its illustrate is the relation between positive auxiliary signal end (AUX+) and the signal intensity of negative auxiliary signal end (AUX-) and the output signal (OUT) of testing circuit.The input end of testing circuit 305 (IN) receives positive auxiliary signal end (AUX+) and negative auxiliary signal end (AUX-), and can learn the difference (VI) between positive auxiliary signal end (AUX+) and negative auxiliary signal end (AUX-).
Before time point t1, VI is less than 20mV, so the output terminal of testing circuit 305 (OUT) is electronegative potential (0V), and positive auxiliary signal end (AUX+) can be considered noise with the upper signal intensity of negative auxiliary signal end (AUX-).When time point t1, VI is greater than 140mV, so the output terminal of testing circuit 305 (OUT) is noble potential (3.3V), and now positive auxiliary signal end (AUX+) can be judged as ditch messenger with the upper signal intensity of negative auxiliary signal end (AUX-).
In Fig. 4 B, when time point t2, VI is less than 20mV, so the output terminal of testing circuit 305 (OUT) is electronegative potential (0V).When time point t3, VI is greater than 140mV, so the output terminal of testing circuit 305 (OUT) is noble potential (3.3V).
Refer to Fig. 5 A, it is according to the circuit diagram of the testing circuit 305 of the display system 30 of the specific embodiment of the invention.For reaching testing circuit 305 after receiving ditch messenger, the output terminal of testing circuit 305 (OUT) is the indicator signal of output device the first current potential (noble potential).Testing circuit 305 comprises the first hysteresis comparator 315, the second hysteresis comparator 317 and XOR (XOR) door 319.The positive input terminal (+) of the first hysteresis comparator 315 connects the positive auxiliary signal end (AUX+) of display port 303, the negative input end (-) of the first hysteresis comparator 315 connects the negative auxiliary signal end (AUX-) of display port 303, the positive input terminal (+) of the second hysteresis comparator 317 connects the negative auxiliary signal end (AUX-) of display port 303, and the negative input end (-) of the second hysteresis comparator 317 connects the positive auxiliary signal end (AUX+) of display port 303.The output terminal of the output terminal of the first hysteresis comparator 315 and the second hysteresis comparator 317 is connected to respectively first input end and second input end of XOR gate 319.The output terminal of XOR gate 319 is the output terminal (OUT) of testing circuit 305.
Testing circuit 305 adopts the first hysteresis comparator 315 and the second hysteresis comparator 317, the erroneous judgement that it can avoid auxiliary signal to cause upper noise.Refer to Fig. 5 B, it is the truth table of testing circuit 305 interior signals, have only when the signal tool different potentials that the output terminal (OUTH) of the first hysteresis comparator 315 and the output terminal (OUTL) of the second hysteresis comparator 317 are exported, the output terminal of testing circuit 305 (OUT) is the indicator signal of output device the first current potential (for example noble potential), make to receive after ditch messenger at testing circuit 305, XOR gate 319 is the indicator signal of meeting output device the first current potential.
In sum, the version of the display port that the display port adopting when host side 32 adopts from display system 30 is different, and while causing display system 30 to learn display system 30 heat inserts in host side 32 by detection signal (SDM), the ditch messenger that display system 30 of the present invention can receive by testing circuit 305 has the display system 30 of judgement, and whether heat inserts in host side 32.The indicator signal that testing circuit 305 is exported can be used for starting the use of display port engine 3 01.The indicator signal that testing circuit 305 is exported also can be used for display controller 307 rapid scanning display systems 30 and whether via DisplayPort interface, is connected in the use of host side 32.
In sum, although the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being defined and be as the criterion by claims.
Claims (15)
1. a display system, can be connected to a main frame, comprises:
One display controller;
One display end, this display end has main online a, auxiliary channel and a detection signal end;
One display end engine,, this auxiliary channel online via this master and this detection signal end are connected to this display end, in order to export a signal of video signal to this display controller; And
One testing circuit, via this accessory channel, be connected to this display end, in order to detect, in this auxiliary channel, an auxiliary signal is to the upper ditch messenger that whether occurs, to export an indicator signal to this display end engine, whether this indicator signal indicates this display controller to be connected with this main frame.
2. display system as claimed in claim 1, is characterized in that, this auxiliary signal is a differential signal to this ditch messenger of output.
3. display system as claimed in claim 1, is characterized in that, this ditch messenger that this display end is sent is from this main frame.
4. display system as claimed in claim 1, is characterized in that, in this auxiliary channel an auxiliary signal on while there is this ditch messenger, by this indicator signal of declaration to open this display end engine.
5. display system as claimed in claim 1, is characterized in that, this testing circuit comprises:
One first hysteresis comparator, the positive input terminal of this first hysteresis comparator connects the first end that this auxiliary signal is right, and the negative input end of this first hysteresis comparator connects the second end that this auxiliary signal is right;
One second hysteresis comparator, the positive input terminal of this second hysteresis comparator connects the second end that this auxiliary signal is right, and the negative input end of this second hysteresis comparator connects the first end that this auxiliary signal is right; And
One XOR gate, is connected to the output terminal of this first hysteresis comparator and this second hysteresis comparator, and the output terminal of this XOR gate produces this indicator signal.
6. display system as claimed in claim 5, is characterized in that, this first hysteresis comparator and this second hysteresis comparator have a magnetic hysteresis width, and this magnetic hysteresis width equals one first numerical value and subtracts a second value, and this first numerical value is greater than this second value.
7. display system as claimed in claim 6, it is characterized in that, this auxiliary signal is to having a signal difference, when this signal difference successively decreases and be less than this second value, produce this indicator signal of one second current potential, and, when this signal difference increases progressively and be greater than this first numerical value, produce this indicator signal of one first current potential in order to notify this this auxiliary signal of display port engine to exporting this ditch messenger.
8. a control method for display system, this display system has one second display end that one first display end is connected to a main frame, comprises the following step:
In an accessory channel of this first display end, obtain the signal difference that an auxiliary signal is right;
When this signal difference increases progressively and is greater than first numerical value, start to produce an indicator signal of one first current potential;
When this signal difference successively decreases and is greater than a second value, continue to produce this indicator signal of this first current potential;
When this signal difference successively decreases and be less than this second value, start to produce this indicator signal of one second current potential; And
When this signal difference increases progressively and be less than this first numerical value, continue to produce this indicator signal of one second current potential;
Wherein, this first numerical value is greater than this second value, and when this indicator signal is this first current potential, represents that this auxiliary signal is to exporting a ditch messenger.
9. the control method of display system as claimed in claim 8, is characterized in that, this auxiliary signal is a differential signal to this ditch messenger of output.
10. the control method of display system as claimed in claim 8, is characterized in that, this ditch messenger that this first display end is sent is from this main frame.
The control method of 11. display systems as claimed in claim 8, it is characterized in that, this display system comprises that a display controller and a display end engine receive this indicator signal, when this indicator signal is this first current potential, this display port engine receives this ditch messenger, and the signal on a master of this first display end is online is converted to a signal of video signal to this display controller.
The control method of 12. display systems as claimed in claim 11, is characterized in that, whether this indicator signal of ` indicates this display controller to be connected with this main frame.
The control method of 13. 1 kinds of display systems, this display system has a display end, comprises the following step:
Detect that in an accessory channel of this display end, an auxiliary signal is to right signal difference produces an indicator signal to utilize this auxiliary signal, wherein, this detecting step sluggishness this signal difference that relatively this auxiliary signal is right is to produce this indicator signal; And
Optionally start this display end, with in response to this indicator signal.
The control method of 14. display systems as claimed in claim 13, is characterized in that, this detecting step, when the absolute value of this right signal difference of this auxiliary signal surpasses first predetermined value, is declared this indicator signal.
The control method of 15. display systems as claimed in claim 14, is characterized in that, this detecting step, when the absolute value of this right signal difference of this auxiliary signal is during lower than second predetermined value, is separated this indicator signal of declaration.
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| CN104751822B (en) * | 2013-12-31 | 2017-11-14 | 纬创资通股份有限公司 | Display system and for display operation method for optimizing |
| CN108597426B (en) * | 2018-03-26 | 2021-03-09 | 武汉精测电子集团股份有限公司 | AUX channel amplitude adjusting device and method in DP interface |
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| CN1619929A (en) * | 2003-11-21 | 2005-05-25 | 上海芯华微电子有限公司 | Digital three phase shift trigger integrated circuit |
| CN101174399A (en) * | 2006-09-29 | 2008-05-07 | 英特尔公司 | Graphics controller, display controller and method for compensating for low response time in displays |
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| US7088741B2 (en) * | 2003-05-01 | 2006-08-08 | Genesis Microchip Inc. | Using an auxilary channel for video monitor training |
| US8200855B2 (en) * | 2008-01-15 | 2012-06-12 | Dell Products L.P. | Method and system for detecting displayport source device connections to sink device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1619929A (en) * | 2003-11-21 | 2005-05-25 | 上海芯华微电子有限公司 | Digital three phase shift trigger integrated circuit |
| CN101174399A (en) * | 2006-09-29 | 2008-05-07 | 英特尔公司 | Graphics controller, display controller and method for compensating for low response time in displays |
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Effective date of registration: 20201027 Address after: No. 1, Xingzhu Road, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: 405, 4th floor, 1st District, Shenzhen Bay science and technology ecological park, Aohai street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Mstar Semiconductor,Inc. Patentee before: MEDIATEK Inc. Effective date of registration: 20201027 Address after: 405, 4th floor, 1st District, Shenzhen Bay science and technology ecological park, Aohai street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Mstar Semiconductor,Inc. Patentee after: MEDIATEK Inc. Address before: 518057, Guangdong, Shenzhen hi tech Zone, South District, science and technology, South ten road, Shenzhen Institute of Aerospace Science and technology innovation, C block, building 4 Patentee before: Mstar Semiconductor,Inc. Patentee before: MSTAR SEMICONDUCTOR Inc. |
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