CN101436395B - Display device and method for controlling the same - Google Patents
Display device and method for controlling the same Download PDFInfo
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- CN101436395B CN101436395B CN2007101879868A CN200710187986A CN101436395B CN 101436395 B CN101436395 B CN 101436395B CN 2007101879868 A CN2007101879868 A CN 2007101879868A CN 200710187986 A CN200710187986 A CN 200710187986A CN 101436395 B CN101436395 B CN 101436395B
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Abstract
The invention provides a display device and a method for controlling the same. The display device comprises a first video signal input end, a second video signal input end, a multi-task device, an identification code detecting module and a control module. The multi-task device is provided with an identification code output end, a first identification code input end and a second identification code input end. The first identification code input end is used for receiving a first identification code corresponding to the first video signal input end, while the second identification code input end is used for receiving a second identification code corresponding to the second video signal input end. When the identification code detecting module detects that the identification code output end is outputting the first or the second identification code, the control module inhibits the multi-task device to switch between the identification code input ends. The display device can prevent the situation that the identification code of the display device cannot be read integrally.
Description
Technical field
The present invention relates to a kind of display device, relate in particular to and a kind ofly guarantee that the identification code of display device can be by the complete control method that reads.
Background technology
(Digital Visual Interface DVI) is a kind of video interface standard of popularizing day by day to digital visual interface.Except the pin position in order to the transmission picture data, the DVI connector also comprises in order to transmission extending display identification data (Extended Display IdentificationData, pin position EDID).Generally speaking, the EDID imprinting is in the embedded internal memory of display (for example LCD screen).Can learn the information such as model, luminophor type, resolution and screen size of this display by EDID.After the EDID that has read display, display card must correspondingly be adjusted the picture data that offers display.If EDID that can't the reading displayed device, some display card even can not be sent to display with picture data.
According to the kind of transmission signals, the DVI connector can be further divided into three kinds of DVI-A, DVI-D and DVI-I again.The DVI-A connector is only in order to transmission of analogue signal; DVI-D is only in order to transmission of digital signals; The DVI-I connector then has both the ability of transmission of analogue signal and digital signal.Therefore, if having the ability that the display of DVI-I connector has receiving digital signals simultaneously and receives simulating signal, then this display can store corresponding to the EDID of digital signal and corresponding to the EDID of simulating signal.
Please refer to Fig. 1, Fig. 1 is the pin position arrangement plan of DVI-I connector.Be numbered 8 and the pin of C1～C5 in order to transmission of analogue signal.(Display Data Channel, DDC) frequency are numbered 7 pin in order to transmission DDC data in order to the transmitting and displaying data channel to be numbered 6 pin.Being numbered 14 and 15 pin is power pin, and other pin is then in order to transmission of digital signals.
Fig. 2 is the annexation synoptic diagram of display card and display.As shown in Figure 2, display card 100 and display 200 are connected to each other by DVI-I connector 210.Analog signal line VA is connected to this pin in order to transmission of analogue signal in the DVI-I connector 210, and digital signal line VD then is connected to this pin in order to transmission of digital signals in the DVI-I connector 210.In addition, signal wire DDC_C is connected to and is numbered 6 DDC frequency pin in the DVI-I connector 210, and signal wire DDC_D is connected to and is numbered 7 DDC data pin in the DVI-I connector 210.
In this example, store the EDID of display 200 among the first storage area 220A, then store the EDID of display 200 among the second storage area 220B corresponding to simulating signal corresponding to digital signal.Because digital EDID and simulation EDID are transferred into display card 100 by same group of signal wire (DDC_C and DDC_D), therefore between the internal memory of DVI-I connector 210 and storage analog/digital EDID, a multiplexer 230A must be set.
When the output terminal of multiplexer 230A is switched to and the signal wire that is connected to the first storage area 220A (SDA_1, SCL_1) when communicating, display card 100 can read the digital EDID that leaves among the first storage area 220A by DVI-I connector 210 and multiplexer 230A.Relatively, when the output terminal of multiplexer 230A is switched to and the signal wire that is connected to the second storage area 220B (SDA_2, SCL_2) when communicating, display card 100 can read the simulation EDID that leaves among the second storage area 220B by DVI-I connector 210 and multiplexer 230A.
As shown in Figure 2, signal wire VA and VD are connected to image processing module 240 by another multiplexer 230B.By switching multiplexer 230B, image processing module 240 can selective reception/fast acquisition of digital video signals or analog video signal, and the signal after will handling is sent to display module 260 broadcasts.Do not receive at display 200 under the situation of external signal, the input end of multiplexer 230B is periodically switched between signal wire VA and VD, whether the output terminal VI that video signal detection module 250 can detect multiplexer 230B receives any signal, when video signal detection module 250 detected output terminal VI and received picture signal, control module 270 began to stop this and periodically switches; In other words, begin to receive vision signal in case detect certain input end, video signal detection module 250 will be passed through control module 270, makes the output terminal VI of multiplexer 230B be fixedly attached to this input end.
Generally speaking, control module 270 is switched multiplexer 230A and multiplexer 230B synchronously.Or rather, when the output terminal VI of multiplexer 230B is switched to when being connected to digital signal line VD, the output terminal of multiplexer 230A can be switched to and be connected to the first storage area 220A that stores digital EDID.Relatively, when the output terminal VI of multiplexer 230B is switched to when being connected to analog signal line VA, the output terminal of multiplexer 230A can be switched to and be connected to the second storage area 220B that stores simulation EDID.
As discussed previously, before the EDID that reads display 200, some display card can't be sent to display with vision signal.With regard to example shown in Figure 2, signal wire VD is corresponding to the digital EDID that is stored in the first storage area 220A.Display card 100 only by after reading complete digital EDID, just can begin by signal wire VD digital video signal to be sent to display 200.
Yet existing video signal detection module 250 does not consider that display card 100 may read the situation of EDID.When display card 100 read EDID, video signal detection module 250 also may be carried out the program whether the output terminal VI that detects multiplexer 230B receives signal.Like this, may have following problems takes place.
When supposing that display card 100 is reading the digital EDID that deposits among the first storage area 220A, but video signal detection module 250 and control module 270 make multiplexer 230A that its input end is switched to SDA_2 and SCL_2 by SDA_1 and SCL_1 according to preset time period, and the program that display card 100 reads digital EDID will be interrupted.Therefore display card 100 can't completely read this numeral EDID.
This read error may cause display card 100 obviously can export the digital visual data of better quality, and display 200 also can show high-quality digital picture, but, and cause the display 200 can't the outputting high quality digital picture or even can't export the problem of any picture fully because digital EDID does not read as yet and finishes.
Summary of the invention
For addressing the above problem, the invention provides a kind of display device and control method thereof.In display device according to the present invention, when this multiplexer was being exported EDID, control module can forbid that this multiplexer switches between different input ends, prevented that thus the identification code of display device can't be by complete situation about reading.
According to an aspect of the present invention, provide a kind of display device, this display device comprises first video signal input terminal, second video signal input terminal, multiplexer, identification code detection module and control module.This multiplexer has identification code output terminal, the first identification code input end and the second identification code input end.This first identification code input end is in order to receive first identification code corresponding to first video signal input terminal; This second identification code input end is in order to receive second identification code corresponding to second video signal input terminal.This identification code detection module is electrically coupled to this multiplexer, in order to detect the output state of this identification code output terminal.This control module is electrically coupled to this detection module and this multiplexer.When this identification code detection module detects this identification code output terminal when exporting first or second identification code, this control module forbids that this multiplexer switches between this identification code input end.
According to display device of the present invention, this first identification code and each self-contained one group of extending display identification data of this second identification code.
According to display device of the present invention, when this output state showed that this identification code output terminal is not exported this first identification code or this second identification code, this control module allowed this multiplexer to switch between this first identification code input end and this second identification code input end.
According to display device of the present invention, when this output state showed that this identification code output terminal stops to export this first identification code or this second identification code, this control module allowed this multiplexer to switch between this first identification code input end and this second identification code input end after an acknowledging time.
According to display device of the present invention, in this output state shows a acknowledging time after this identification code output terminal stops to export this first identification code or this second identification code, if this output state does not show this identification code output terminal and begins to export this first identification code or this second identification code that then this control module allows this multiplexer to switch once more between this first identification code input end and this second identification code input end.
According to display device of the present invention, this display device also comprises a video signal detection module, when this control module allowed this multiplexer to switch between this first identification code input end and this second identification code input end, this control module controlled that this video signal detection module detects this first video signal input terminal in turn or whether this second video signal input terminal receives any vision signal.
According to display device of the present invention, when this video signal detection module detected this first video signal input terminal and whether receives any vision signal, this control module was controlled this multiplexer and is switched to this first identification code input end; When this video signal detection module detected this second video signal input terminal and whether receives any vision signal, this control module was controlled this multiplexer and is switched to this second identification code input end.
According to a further aspect in the invention, a kind of method that is used to control display device is provided, this display device comprises first video signal input terminal, second video signal input terminal and multiplexer, this multiplexer has the identification code output terminal, the first identification code input end and the second identification code input end, this first identification code input end is in order to receive first identification code corresponding to this first video signal input terminal, this second identification code input end is in order to receive second identification code corresponding to this second video signal input terminal, and this control method may further comprise the steps: the output state that detects this identification code output terminal; And when this output state shows that this identification code output terminal is being exported this first identification code or this second identification code, forbid that this multiplexer switches between this first identification code input end and this second identification code input end.
According to control method of the present invention, this first identification code and each self-contained one group of extending display identification data of this second identification code.
According to control method of the present invention, further may further comprise the steps: when this output state shows that this identification code output terminal is not exported this first identification code or this second identification code, allow this multiplexer between this first identification code input end and this second identification code input end, to switch.
According to control method of the present invention, further may further comprise the steps: when this output state shows that this identification code output terminal stops to export this first identification code or this second identification code, after an acknowledging time, allow this multiplexer between this first identification code input end and this second identification code input end, to switch.
According to control method of the present invention, further may further comprise the steps: in this output state shows a acknowledging time after this identification code output terminal stops to export this first identification code or this second identification code, if this output state does not show this identification code output terminal once more and begins to export this first identification code or this second identification code, then allow this multiplexer between this first identification code input end and this second identification code input end, to switch.
According to control method of the present invention, further may further comprise the steps: when this output state shows that this identification code output terminal is not exported this first identification code or this second identification code, detect this first video signal input terminal in turn or whether this second video signal input terminal receives any vision signal.
According to control method of the present invention, further may further comprise the steps: when whether this first video signal input terminal of detection receives any vision signal, control this multiplexer and switch to this first identification code input end; And when whether this second video signal input terminal of detection receives any vision signal, control this multiplexer and switch to this second identification code input end.
The advantages and spirit of the present invention can be further understood by following detailed Description Of The Invention and appended accompanying drawing.
Description of drawings
Fig. 1 is the pin position arrangement plan of DVI-I connector.
Fig. 2 is the annexation synoptic diagram of display card and display.
Fig. 3 is the calcspar according to display device of the present invention.
Fig. 4 is the waveform example of EDID data line and frequency line.
Fig. 5 and Fig. 6 are the process flow diagrams according to display-apparatus control method of the present invention.
Embodiment
Be display device according to an advantageous embodiment of the invention.Please refer to Fig. 3, Fig. 3 shows the calcspar of this display device 300.Display device 300 is connected with display card 100 by connector 301, and comprises the first video signal input terminal 310A, the second video signal input terminal 310B, multiplexer 320B, multiplexer 320A, video signal detection module 360, identification code detection module 330 and control module 340.In addition, also comprise in the display device 300 in order to the first storage area 350A that stores first identification code with in order to store the second storage area 350B of second identification code.
First identification code is corresponding to the first video signal input terminal 310A, and second identification code is then corresponding to the second video signal input terminal 310B.In actual applications, but this first identification code and each self-contained one group of EDID of this second identification code.For example, the first video signal input terminal 310A is in order to the receiving digital video signal, required digital video EDID when first identification code then comprises display device 300 display digit videos.The second video signal input terminal 310B is in order to receiving analog video signal, required analog video EDID when second identification code then comprises display device 300 analog video.
As shown in Figure 3, multiplexer 320A has identification code output terminal O, the first identification code input end A and the second identification code input end B.The first identification code input end A is in order to receive first identification code, and the second identification code input end B is then in order to receive second identification code.
Identification code detection module 330 is responsible for detecting the output state of identification code output terminal O.The situation that comprises EDID with this identification code is an example, and in fact identification code output terminal O comprises data line DDC_D and frequency line DDC_C.Please refer to Fig. 4, Fig. 4 is the waveform example of this two signal line.As shown in FIG., if a negative edge appears in the DDC_D signal when DDC_C voltage of signals is high levle, represent that then identification code output terminal O begins to export the EDID identification code.Relatively, if a positive edge appears in the DDC_D signal when DDC_C voltage of signals is high levle, represent that then identification code output terminal O stops to export the EDID identification code.
In addition, as shown in Figure 3, the first video signal input terminal 310A and the second video signal input terminal 310B are connected to image processing module 370 by multiplexer 320B.By switching multiplexer 320B, image processing module 370 can selective reception/fast acquisition of digital video signals or analog video signal, and the signal after will handling is sent to display module 380 broadcasts.In actual applications, display device 300 may further include video signal detection module 360, in order to detect the output terminal of multiplexer 320B.
Please refer to Fig. 5, Fig. 5 is the operating process of identification code detection module 330 and control module 340.Shown in step S501, identification code detection module 330 at first can continue to detect the output state of identification code output terminal O, and judges whether identification code output terminal O the signal of identification code occurs beginning to export.In case the judged result of step S501 is for being that identification code detection module 330 makes control module 340 forbid that multiplexer 320A switches between the first identification code input end A and the second identification code input end B execution in step S502.
Then, shown in step S503, identification code detection module 330 can continue to detect the output state of identification code output terminal O, and judges whether identification code output terminal O the signal of identification code occurs stopping to export.In case the judged result of step S503 is for being, identification code detection module 330 can judge in view of the above that certain EDID identification code is read by complete, and execution in step S504, makes control module 340 recover the handoff functionality of multiplexer 320A.
In brief, when this output state showed that identification code output terminal O does not export this first identification code or this second identification code, 340 of control modules allowed multiplexer 320A to switch between the first identification code input end A and the second identification code input end B.
In addition, in step S502, except forbidding that multiplexer 320A switches the identification code input end, control module 340 also can select (1) to forbid that simultaneously multiplexer 320B switches its input end 310A, 310B is connected with multiplexer 320B output terminal, or selects (2) to allow multiplexer 320B to keep its periodically handoff functionality.
In actual applications, control module 340 also can be after identification code output terminal O stops to export identification code, and after waiting for a period of time, execution in step S504 recovers control multiplexer 320A and carries out the periodically action of switching again; Perhaps, control module 340 also can further confirm in the stand-by period at this section whether identification code output terminal O restarts to export identification code.O does not begin to export identification code once more if identification code detection module 330 is found the identification code output terminal, and then control module 340 ability execution in step S504 control multiplexer 320A and switch between the first identification code input end A and the second identification code input end B.
On the other hand, when control module 340 control multiplexer 320A switch its input end, control module 340 also can be switched multiplexer 320B simultaneously, makes video signal detection module 360 periodically detect the first video signal input terminal 310A in turn or whether the second video signal input terminal 310B receives any vision signal.
Therefore find identification code output terminal O when (1) identification code detection module 330 and do not export identification code, and when (2) video signal detection module 360 desires detect the first video signal input terminal 310A and whether receive any vision signal, control module 340 control multiplexer 320B switch to the first video signal input terminal 310A, and correspondingly control multiplexer 320A and switch to the first identification code input end A.So make first identification code (for example digital video EDID) be sent to display card 100, video signal detection module 360 detects display card 100 and whether can export first vision signal (for example digital video signal) then.
Find identification code output terminal O when (1) identification code detection module 330 and do not export identification code, and when (2) video signal detection module 360 desires detect the second video signal input terminal 310B and whether receive any vision signal, control module 340 control multiplexer 320B switch to the second video signal input terminal 310B, and correspondingly control multiplexer 320A and switch to the second identification code input end B.So make second identification code (for example analog video EDID) be sent to display card 100, video signal detection module 360 detects display card 100 and whether can export second vision signal (for example analog video signal) then.
The purpose that can utilize the counter realized with firmware (firmware) and flag (flag) to reach the handoff functionality of management multiplexer 320A according to embodiments of the invention.Please refer to Fig. 6, Fig. 6 shows the flow instance corresponding to this implementation.
In this example, at first shown in step S601, flag F
DThe count value C of sum counter
DAll be set to 0.Step S602 judges whether the identification code output terminal O of multiplexer 320A the signal of identification code occurs beginning to export.If the judged result of step S602 is for being, flag F then
DIn step S603, be set to 1, and count value C
DBe set to 0 once more.
Then, step S604 judges whether the identification code output terminal O of multiplexer 320A the signal of identification code occurs stopping to export.If the judged result of step S604 is not, then step S604 is repeated to carry out.If the judged result of step S604 is for being, count value C then
DIn step S605, be coupled with 1.Step S606 then judges count value C
DWhether reached certain default value (for example 5).If the judged result of step S606 is for being that then step S601 is re-executed.Relatively, if the judged result of step S606 is that then step S602 is not re-executed.
In addition, if the judged result of step S602 is not, then step S607 is performed to check flag F
DState whether be 1.If the judged result of step S607 is for being, then step S605 and its subsequent step are performed.If the judged result of step S607 is that then step S601 is not re-executed.
When identification code output terminal O occurs beginning to export the signal of identification code, flag F
DBe set to 1.After identification code output terminal O occurred stopping to export the signal of identification code, this counter can start the function of once checking identification code output terminal O every a fixed cycle (for example 20 milliseconds).Suppose not find all that through rechecking several times the signal of identification code appears beginning to export in identification code output terminal O, then this flag F
DJust be set to 0.As flag F
DBe 1 o'clock, the handoff functionality of multiplexer 320A is stopped.As flag F
DBe 0 o'clock, the handoff functionality of multiplexer 320A then is allowed to.
As mentioned above, when this multiplexer is being exported identification code, therefore can forbid that according to control module of the present invention and control method this multiplexer switches between different input ends, can avoid the identification code of display device in the prior art can't be by complete situation about reading.
By the detailed description of above preferred specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to limit category of the present invention with above-mentioned disclosed preferred specific embodiment.On the contrary, its objective is that hope can contain various changes and be equal to alternative in the claimed claim scope of the present invention.
Main element numbers explanation
100: display card 200,300: display
210,301: connector 220A: first storage area
220B: the second storage area 230A, 230B: multiplexer
240: image processing module 250: the video signal detection module
260: show module 270: the control module
310A: the first video signal input terminal 310B: second video signal input terminal
320A, 320B: multiplexer 330: identification code detection module
340: control module 350A: first storage area
350B: second storage area 360: video signal detection module
370: image processing module 380: display module
S501～S504: process step S601～S607: process step
Claims (12)
1. display device comprises:
First video signal input terminal;
Second video signal input terminal;
Multiplexer, have identification code output terminal, the first identification code input end and the second identification code input end, the described first identification code input end is in order to receive first identification code corresponding to described first video signal input terminal, the described second identification code input end is in order to receive second identification code corresponding to described second video signal input terminal, each self-contained one group of extending display identification data of described first identification code and described second identification code;
The identification code detection module is electrically coupled to described multiplexer, in order to detect the output state of described identification code output terminal; And
Control module, be electrically coupled to described detection module and described multiplexer, when described output state showed that described identification code output terminal is being exported described first identification code or described second identification code, described control module forbade that described multiplexer switches between described first identification code input end and the described second identification code input end.
2. display device according to claim 1, wherein, when described output state showed that described identification code output terminal is not exported described first identification code or described second identification code, described control module allowed described multiplexer to switch between described first identification code input end and the described second identification code input end.
3. display device according to claim 1, wherein, when described output state showed that described identification code output terminal stops to export described first identification code or described second identification code, described control module allowed described multiplexer to switch between described first identification code input end and the described second identification code input end after an acknowledging time.
4. display device according to claim 1, wherein, in described output state shows a acknowledging time after described identification code output terminal stops to export described first identification code or described second identification code, if described output state does not show described identification code output terminal and begins to export described first identification code or described second identification code that then described control module allows described multiplexer to switch once more between described first identification code input end and the described second identification code input end.
5. display device according to claim 1, wherein, described display device also comprises the video signal detection module, when described control module allowed described multiplexer to switch between described first identification code input end and the described second identification code input end, described control module controlled that described video signal detection module detects described first video signal input terminal in turn or whether described second video signal input terminal receives any vision signal.
6. display device according to claim 5, wherein, when described video signal detection module detected described first video signal input terminal and whether receives any vision signal, described control module was controlled described multiplexer and is switched to the described first identification code input end; When described video signal detection module detected described second video signal input terminal and whether receives any vision signal, described control module was controlled described multiplexer and is switched to the described second identification code input end.
7. one kind is used for method for controlling display device, described display device comprises first video signal input terminal, second video signal input terminal and multiplexer, described multiplexer has the identification code output terminal, the first identification code input end and the second identification code input end, the described first identification code input end is in order to receive first identification code corresponding to described first video signal input terminal, the described second identification code input end is in order to receive second identification code corresponding to described second video signal input terminal, each self-contained one group of extending display identification data of described first identification code and described second identification code, described control method may further comprise the steps:
Detect the output state of described identification code output terminal; And
When described output state shows that described identification code output terminal is being exported described first identification code or described second identification code, forbid that described multiplexer switches between described first identification code input end and the described second identification code input end.
8. control method according to claim 7 further may further comprise the steps:
When described output state shows that described identification code output terminal is not exported described first identification code or described second identification code, allow described multiplexer between described first identification code input end and the described second identification code input end, to switch.
9. control method according to claim 7 further may further comprise the steps:
When described output state shows that described identification code output terminal stops to export described first identification code or described second identification code, after an acknowledging time, allow described multiplexer between described first identification code input end and the described second identification code input end, to switch.
10. control method according to claim 7 further may further comprise the steps:
In described output state shows a acknowledging time after described identification code output terminal stops to export described first identification code or described second identification code, if described output state does not show described identification code output terminal once more and begins to export described first identification code or described second identification code, then allow described multiplexer between described first identification code input end and the described second identification code input end, to switch.
11. control method according to claim 7 further may further comprise the steps:
When described output state shows that described identification code output terminal is not exported described first identification code or described second identification code, detect described first video signal input terminal in turn or whether described second video signal input terminal receives any vision signal.
12. control method according to claim 11 further may further comprise the steps:
When whether described first video signal input terminal of detection receives any vision signal, control described multiplexer and switch to the described first identification code input end; And
When whether described second video signal input terminal of detection receives any vision signal, control described multiplexer and switch to the described second identification code input end.
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| CN106470324A (en) * | 2015-08-20 | 2017-03-01 | 晨星半导体股份有限公司 | It is applied to the control circuit of digital visual interface and the control method of correlation |
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| KR20030080762A (en) * | 2002-04-10 | 2003-10-17 | 엘지전자 주식회사 | Apparatus for Writing EDID of The Monitor |
| JP2004077506A (en) * | 2002-08-09 | 2004-03-11 | Nec Mitsubishi Denki Visual Systems Kk | Display device, display system, and cable |
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| KR20030080762A (en) * | 2002-04-10 | 2003-10-17 | 엘지전자 주식회사 | Apparatus for Writing EDID of The Monitor |
| JP2004077506A (en) * | 2002-08-09 | 2004-03-11 | Nec Mitsubishi Denki Visual Systems Kk | Display device, display system, and cable |
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