CN101631208B - Display device and phase detection method thereof - Google Patents
Display device and phase detection method thereof Download PDFInfo
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- CN101631208B CN101631208B CN2008101339188A CN200810133918A CN101631208B CN 101631208 B CN101631208 B CN 101631208B CN 2008101339188 A CN2008101339188 A CN 2008101339188A CN 200810133918 A CN200810133918 A CN 200810133918A CN 101631208 B CN101631208 B CN 101631208B
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Abstract
The invention relates to a display device and a phase detection method thereof. The display device comprises an analog to digital conversion module, a phase position detection module and a time generation module. The analog to digital conversion module is used for receiving a first analog image signal and converting the first analog image signal into a digital signal according to a time signal, wherein first analog image signal comprises first synchronizing information and first image information; the phase position detection module is used for receiving the digital signal and outputting a phase position regulating signal according to a part, corresponding to the first synchronizing information, of the digital signal; and the time generation module is used for outputting the time signal according to the phase position regulating signal.
Description
Technical field
The present invention relates to a kind of display unit, and particularly relate to a kind of display unit and method for detecting phases thereof with phase-detection.
Background technology
Along with the arriving of information age, people no longer are satisfied with simple literal or still photo in the past and present for the reception and the transmission of data message.The substitute is and utilize some high-quality flat display apparatus to present careful dynamic image.
With a known television equipment is example, known television equipment is at video graphics array (Video Graphics Array that it received, VGA) picture utilizes the picture characteristic under static state of video graphics array to carry out computing when carrying out automatic phase detection action exactly.Please also refer to the signal of video signal oscillogram of the video graphics array picture part shown in Fig. 1 at this.Waveform illustrated in fig. 1 is represented black, white, black, a white alternate image.And can know by illustrating of Fig. 1 and to learn, capture shadow sample information wherein accurately, just must detect the phase relation of this signal of video signal accurately.
Because the image information VO in the signal of video signal of video graphics array is during with correct phase-samplomh, the pixel that sampling is come out has bigger color range difference each other.Therefore, known automatic phase detection technique is just utilized these characteristics, for example utilize various phase place to carry out the sampling of image information VO, to find out the phase place that can make color range difference STP1, STP2, STP3 and STP4 maximum in the signal of video signal, and utilize some STP1, STP2, STP3 and the STP4 of these color range maximums to be used as the residing phase place of each image information, the image information of taking a sample.
Yet, the image that in television image, is presented, in the majority with dynamic menu, tableaux is less.Therefore, above-mentioned known phase detection method also can't be found out tangible color range difference maximum point, defines the correct phase of each image information.The image information accurately of also therefore can't taking a sample out causes the distortion of display frame.
Summary of the invention
The invention provides a kind of display unit, the synchronizing information of the analog image signal that acquisition is received uses and carry out phase-detection, and then efficient sampling goes out to simulate the image information of signal of video signal.
The invention provides a kind of method for detecting phases, utilize the synchronizing information of the analog image signal in the television system to carry out phase-detection, efficient sampling goes out to simulate the image information of signal of video signal.
The invention provides a kind of display unit, comprise analog digital conversion (analog to digitalconverter, ADC) module, phase detecting module and clock generating module.The analog digital modular converter is used for receiving the first analog image signal, and is digital signal according to clock signal with the first analog image conversion of signals.The first analog image signal includes first synchronizing information and first image information.Phase detecting module then is to be coupled to the analog digital modular converter, is used for receiving digital signals, and according to the part of corresponding first synchronizing information in the digital signal, output phase is adjusted signal.The clock generating module then is coupled to phase detecting module and analog digital modular converter, is used for according to phase adjustment signal clock signal.
In one embodiment of this invention, above-mentioned display unit also includes the analog signal reverser, is coupled to the analog digital modular converter.This analog signal reverser is used from the outside and is received the second analog image signal, and oppositely this second analog image signal to produce the first analog image signal.
In one embodiment of this invention, above-mentioned display unit also includes the analog signal reverser and is coupled to the analog digital modular converter.This analog signal reverser is used from the outside and is received the second analog image signal, and this second analog image signal packet contains second synchronizing information and second image information, and second synchronizing information of the reverse at least second analog image signal, to produce the first analog image signal, corresponding first synchronizing information of second synchronizing information wherein.
In one embodiment of this invention, above-mentioned clock generating module be the phase-locked loop (phaselocked loop, PLL).
In one embodiment of this invention, above-mentioned analog digital modular converter changes the scope of analog digital conversion, carries out the analog digital conversion with first synchronizing information and first image information at the first analog image signal respectively.
In one embodiment of this invention, above-mentioned analog digital modular converter comprises first analog-digital converter and second analog-digital converter.First analog-digital converter wherein receives the first analog image signal, and first image information of the first analog image signal is carried out the analog digital conversion.The same first analog image signal that receives of second analog-digital converter, and first synchronizing information of this first analog image signal is carried out analog digital change.
In one embodiment of this invention, wherein when first analog-digital converter operated, second analog-digital converter decommissioned.Opposite, during the running of second analog-digital converter, first analog-digital converter then decommissions.
The invention provides a kind of method for detecting phases is applicable in the display unit, its step comprises: at first, receive the first analog image signal, and according to clock signal, with the first analog image conversion of signals is digital signal, and this first analog image signal comprises first synchronizing information and first image information.Then, according to the part of corresponding first synchronizing information in the digital signal, produce phase adjustment signal.At last, again according to phase adjustment signal, clocking.
The present invention is because of utilizing the synchronizing information in the analog image signal, carries out the phase-detection action, therefore, and can be more accurately and effectively detect the transmission phase place of analog image signal, and then correct sampling goes out to simulate the image information in the signal of video signal.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the signal of video signal oscillogram of video graphics array picture part.
Fig. 2 shows the display unit schematic diagram of the first embodiment of the present invention.
Fig. 3 shows analog image signal YIN1 waveform schematic diagram.
Fig. 4 shows the display unit schematic diagram of the second embodiment of the present invention.
The oscillogram of analog image signal YIN2 after Fig. 5 A, 5B show oppositely respectively.
Fig. 6 shows the display unit schematic diagram of the third embodiment of the present invention.
Fig. 7 shows the action flow chart of an embodiment of method for detecting phases of the present invention.
The reference numeral explanation
200,400,600: display unit
210,610: the analog digital modular converter
220,620: phase detecting module
230,630: the clock generating module
410: the analog signal reverser
611,612: analog-digital converter
STP1-STP4: the point of color range difference maximum
VO: image information
SYNC: synchronizing information
BK: black picture level
LO: minimum voltage
YIN1, YIN2: analog image signal
PTUN: phase adjustment signal
CK: clock signal
S710-S730: phase detection method step
Embodiment
Below will propose a plurality of embodiment and be illustrated at display unit of the present invention, and conjunction with figs., more can understand in the hope of those skilled in the art, and get enforcement according to this.
Please refer to Fig. 2, Fig. 2 shows the display unit schematic diagram of the first embodiment of the present invention.Display unit 200 comprises analog digital modular converter 210, phase detecting module 220 and clock generating module 230.Analog digital modular converter 210 wherein is from the outside analog image signal YIN1 that receives, and according to clock signal C K, analog image signal YIN1 is carried out the analog digital conversion, and the signal of video signal of its number format of changing out is sent in the phase detecting module 220.Include synchronizing information and image information among the analog image signal YIN1 wherein.
And phase detecting module 220 receives the digital signal that analog digital modular converters 210 are produced, and according to the part of the synchronizing information of corresponding analog image signal YIN1 in the digital signal, carries out the phase-detection of image information.In addition, phase detecting module 220 comes output phase to adjust signal PTUN according to detected result.
Below please also refer to Fig. 2 and Fig. 3, Fig. 3 shows analog image signal YIN1 waveform schematic diagram.As shown in Figure 3, synchronizing information SYNC is loaded in the initiating terminal of analog image signal YIN1, and is positioned at the zone of minimum voltage LO, is then following many image information VO after the synchronizing information SYNC; Wherein, the minimum point of analog image signal YIN1 then is minimum voltage LO (its corresponding synchronizing information SYNC), the minimum level of image information then is black picture level BK, and its representative is when image information is positioned at black picture level BK, and the shown picture of display unit is for deceiving picture.
Note that at this because in dynamic image, image information VO can change arbitrarily, therefore, the image information VO of dynamic image also is not suitable as the foundation of phase-detection; But even dynamic image, its synchronizing information SYNC but can not change, and therefore, the present invention is convenient for the tableaux of synchronizing information SYNC as an equivalence, carries out phase-detection.And its phase-detection mechanism, can be similar with known phase-detection mechanism, it is noted that phase-detection mechanism of the present invention uses synchronizing information SYNC as the detection foundation, but not utilize image information as detecting foundation.
According to above principle, phase detecting module 220 only need detect in the digital signal, and the digital value of corresponding synchronizing information SYNC position just can be learnt present phase place situation, uses the action that realizes phase-detection, and output phase is adjusted signal PTUN according to this.
Please note at this, in known technology, building the analog digital modular converter that places in the display unit only can be used for image information is carried out the analog digital conversion, for instance, because the voltage level of image information is between black picture level BK and white picture level WH, therefore, the analog digital conversion range of known analog data-converting block is that (for example will deceive the picture level conversion is digital value 0 between black picture level BK and white picture level WH, and white picture level WH is converted to digital value 255), and for the voltage level outside this scope, owing to surpass the analytical range of analog digital modular converter, just can't be converted into other digital value.
Yet, because the present invention also must carry out the analog digital conversion to synchronizing information, to carry out phase-detection; Therefore, analog digital modular converter 210 used in the present invention must have bigger analog digital conversion range (minimum must can the parsing to minimum voltage LO), so can carry out the analog digital conversion to synchronizing information.
Perhaps, the present invention also can dynamically adjust the conversion range of analog digital modular converter 210, for example, the present invention can change the conversion range of analog digital modular converter 210 when conversion synchronization information, it can be resolved synchronizing information, and when the conversion image information, again analog digital modular converter 210 is changeed back and is conversion range originally, just so analog digital modular converter 210 can as operation, image information is carried out digital-to-analogue conversion.
In addition, the present invention also can handle synchronizing information, so that general analog digital modular converter 210 need not pass through any change, just can carry out the analog digital conversion of synchronizing information; For instance, the present invention can revise the level of synchronizing information, and synchronizing information is entered within the analog digital modular converter 210 analysable scopes; For example, the present invention can utilize a level adjuster (level shifter) directly to revise the voltage level of synchronizing information, and it is moved within the analog digital modular converter 210 analysable scopes; Perhaps, the present invention also can utilize a simulated inverse device, and synchronizing information is reverse, it is entered within the analog digital modular converter 210 analysable scopes, and these corresponding variations will be stated in disclosure thereafter.
Then please refer to Fig. 4, Fig. 4 shows display unit 400 schematic diagrames of the second embodiment of the present invention.Different is to have added an analog signal reverser 410 in display unit 400 to display unit 200 among display unit 400 and first embodiment.And the function of analog signal reverser 410 is that analog image signal YIN1 is converted to before the number format, carries out reverse action earlier.Analog image signal YIN2 after then utilizing oppositely again carries out the action of digital-to-analogue conversion.
Please refer to Fig. 5 A and Fig. 5 B, the oscillogram of the analog image signal YIN2 after Fig. 5 A, 5B show oppositely respectively.Fig. 5 A wherein is shown to be oscillogram after carrying out oppositely at whole analog image signal YIN1, and Fig. 5 B is shown then to be oscillogram after only carrying out oppositely at the synchronizing information SYNC of analog image signal YIN1.
As previously mentioned, why will carry out synchronizing information oppositely mainly is because the deficiency of the conversion range of analog digital modular converter 210, synchronizing information after so can making oppositely enter analog digital modular converter 210 conversion range (that is, make this reverse synchronizing information be equivalent to a tableaux), to avoid known owing to the phase-detection of using dynamic menu to make the mistake.
Yet the dealer can select the mode of Fig. 4 or Fig. 5 voluntarily, only carries out oppositely at synchronizing signal, or whole analog image signal is carried out oppositely, and such operation is not awkward for those skilled in the art, seldom gives unnecessary details herein.
Below please refer to Fig. 6, Fig. 6 shows the display unit schematic diagram of the third embodiment of the present invention.Display unit 600 includes analog digital modular converter 610, phase detecting module 620 and clock generating module 630.Then comprise two analog-digital converters 611,612 in the analog digital modular converter 610.These two analog-digital converters 611,612 are used for synchronizing information and the image information of the analog image signal YIN1 that received at analog digital modular converter 610 respectively and carry out the analog digital conversion.
At this, therefore the reason of utilizing two analog-digital converters is to be that the synchronizing information of analog image signal YIN1 and image information branch are on the different voltage levels, designs two analog-digital converters 611,612 respectively and carries out the analog digital conversion at the synchronizing information and the image information of different range.Wherein the output of carrying out the analog-digital converter 611 of analog digital conversion at synchronizing information offers phase detecting module 620 and carries out phase-detection.620 results according to phase-detection of phase detecting module produce phase adjustment signal PTUN, and offer clock generating module 630, and clock generating module 630 is again according to phase adjustment signal PTUN clocking CK.
At this moment, 612 of analog-digital converters come accurately to carry out the analog digital conversion at the image information of analog image signal YIN1 according to clock signal C K, to obtain the image information of number format.
Please note at this, in the process of the analog digital conversion of carrying out the analog image signal, analog-digital converter 611,612 need not operate simultaneously, that is when carrying out the analog digital transition operation at the synchronizing information of analog image signal, can only use analog-digital converter 611, and the analog-digital converter 612 of stopping using; And when carrying out the analog digital transition operation at this image information, the analog-digital converter 611 of can stopping using.
Propose an embodiment with next at the method for detecting phases of display unit that is applicable to of the present invention, its action details is described.
Please refer to Fig. 7, Fig. 7 shows the action flow chart of an embodiment of method for detecting phases of the present invention.The action step of present embodiment is described as follows: at first, receive the analog image signal, and be digital signal according to clock signal with the analog image conversion of signals, above-mentioned analog image signal comprises synchronizing information and image information (step S710).Then,, produce phase adjustment signal (step S720) according to the part of corresponding synchronizing information in the digital signal, at last again according to phase adjustment signal, clocking (step S730).
In addition, the analog image signal of step S710 can be to come from the analog image signal that will be received by the outside to carry out oppositely resulting (for example the whole analog image signal that receives being carried out oppositely, or only carry out oppositely at the part of synchronizing information), the voltage level of entrained synchronizing information has been adjusted to digital-to-analogue conversion module 210 accessible scopes in this analog image signal.And the synchronizing information of the analog image signal that the outside of being mentioned here receives, with the synchronizing information of being mentioned among the step S710 be corresponding.
What deserves to be mentioned is, be in the step of digital signal carrying out the analog image conversion of signals, can also change the scope of analog digital conversion at the synchronizing information or the image information of analog image signal, to carry out corresponding analog digital conversion.
It will be further appreciated that, in the process that the analog digital of analog image signal is changed, when carrying out the analog digital transition operation, stop to carry out the analog digital transition operation at this image information at the synchronizing information of analog image signal; And when carrying out the analog digital transition operation at this image information, stop to carry out the analog digital transition operation at this synchronizing information.
In sum, the present invention propose a kind of display unit with and phase detection method, be the synchronizing information of utilizing in the analog image signal, be used as the foundation of phase-detection, and then correct sampling goes out to simulate the image information in the signal of video signal, to improve display quality.
Though the present invention discloses as above with preferred embodiment; but it is not in order to qualification the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; when can doing some changes and modification, so protection scope of the present invention should be as the criterion with claim of the present invention.
Claims (12)
1. display unit comprises:
One analog digital modular converter is used for receiving one first analog image signal, and according to a clock signal, is a digital signal with this first analog image conversion of signals, and this first analog image signal comprises one first synchronizing information and one first image information;
One phase detecting module is coupled to this analog digital modular converter, is used for receiving this digital signal, and according in this digital signal to part that should first synchronizing information, export a phase adjustment signal; And
One clock generation module is coupled to this phase detecting module and this analog digital modular converter, is used for exporting this clock signal according to this phase adjustment signal.
2. display unit as claimed in claim 1, it also includes:
One analog signal reverser is coupled to this analog digital modular converter, and use from the outside and receive one second analog image signal, and reverse this second analog image signal, to produce this first analog image signal.
3. display unit as claimed in claim 1, it also includes:
One analog signal reverser, be coupled to this analog digital modular converter, use from the outside and receive one second analog image signal, this second analog image signal packet contains one second synchronizing information and one second image information, and this second synchronizing information of reverse at least this second analog image signal, to produce this first analog image signal;
Wherein this second synchronizing information is to should first synchronizing information.
4. display unit as claimed in claim 1, wherein this clock generating module is a phase-locked loop.
5. display unit as claimed in claim 1, wherein this analog digital modular converter changes the scope of analog digital conversion, carries out the analog digital conversion with this first synchronizing information and this first image information at this first analog image signal respectively.
6. display unit as claimed in claim 1, wherein this analog digital modular converter comprises:
One first analog-digital converter receives this first analog image signal, and this first image information of this first analog image signal is carried out the analog digital conversion; And
One second analog-digital converter receives this first analog image signal, and this first synchronizing information of this first analog image signal is carried out the analog digital conversion.
7. display unit as claimed in claim 6, wherein when the running of this first analog-digital converter, this second analog-digital converter decommissions, and during this second analog-digital converter running, this first analog-digital converter decommissions.
8. display unit as claimed in claim 1, it also includes:
One level adjuster, be coupled to this analog digital modular converter, use from the outside and receive one second analog image signal, this second analog image signal packet contains one second synchronizing information and one second image information, and adjust the voltage level of this second synchronizing information of this second analog image signal at least, to produce this first analog image signal;
Wherein this second synchronizing information is to should first synchronizing information.
9. a phase detection method is applicable in the display unit, and its step comprises:
Receive one first analog image signal, and according to a clock signal, be a digital signal with this first analog image conversion of signals, this first analog image signal comprises one first synchronizing information and one first image information;
According in this digital signal to part that should first synchronizing information, produce a phase adjustment signal; And
According to this phase adjustment signal, produce this clock signal.
10. method for detecting phases as claimed in claim 9 wherein also comprises:
Receive one second analog image signal from the outside, and reverse this second analog image signal, to produce this first analog image signal.
11. method for detecting phases as claimed in claim 9 wherein also comprises:
Receive one second analog image signal from the outside, this second analog image signal packet contains one second synchronizing information and one second image information, and this second synchronizing information of reverse at least this second analog image signal, to produce this first analog image signal;
Wherein this second synchronizing information is to should first synchronizing information.
12. method for detecting phases as claimed in claim 9 wherein also comprises:
Receive one second analog image signal from the outside, this second analog image signal packet contains one second synchronizing information and one second image information, and adjust the voltage level of this second synchronizing information of this second analog image signal at least, to produce this first analog image signal;
Wherein this second synchronizing information is to should first synchronizing information.
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| CN2008101339188A CN101631208B (en) | 2008-07-15 | 2008-07-15 | Display device and phase detection method thereof |
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| CN2008101339188A CN101631208B (en) | 2008-07-15 | 2008-07-15 | Display device and phase detection method thereof |
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| CN101631208A CN101631208A (en) | 2010-01-20 |
| CN101631208B true CN101631208B (en) | 2011-05-11 |
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| CN106130546B (en) * | 2016-07-18 | 2019-03-15 | 北京邮电大学 | A kind of method for detecting phases and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1246000A (en) * | 1998-08-20 | 2000-03-01 | 瑞轩科技股份有限公司 | Digital analogue signal/digital signal conversion circuit |
| CN1275032A (en) * | 1999-05-14 | 2000-11-29 | 索尼公司 | Video signal output device and video signal input device |
| CN1756298A (en) * | 2004-06-02 | 2006-04-05 | 晨星半导体股份有限公司 | Method and device for dynamically adjusting sync-on-green (SOG) signal of video signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1246000A (en) * | 1998-08-20 | 2000-03-01 | 瑞轩科技股份有限公司 | Digital analogue signal/digital signal conversion circuit |
| CN1275032A (en) * | 1999-05-14 | 2000-11-29 | 索尼公司 | Video signal output device and video signal input device |
| CN1756298A (en) * | 2004-06-02 | 2006-04-05 | 晨星半导体股份有限公司 | Method and device for dynamically adjusting sync-on-green (SOG) signal of video signal |
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