EP1183676A1 - Verfahren und einrichtung zum abgleich der phase bei flachbildschirmen - Google Patents
Verfahren und einrichtung zum abgleich der phase bei flachbildschirmenInfo
- Publication number
- EP1183676A1 EP1183676A1 EP00929227A EP00929227A EP1183676A1 EP 1183676 A1 EP1183676 A1 EP 1183676A1 EP 00929227 A EP00929227 A EP 00929227A EP 00929227 A EP00929227 A EP 00929227A EP 1183676 A1 EP1183676 A1 EP 1183676A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phase
- pixel
- value
- falling edge
- flat screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/18—Timing circuits for raster scan displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
- G09G5/008—Clock recovery
Definitions
- the invention relates to a method and a device for comparing the phase between the pixel clock of a graphics card and the sampling clock of a flat screen with an analog interface m a flat screen graphics card computer system.
- a microprocessor takes over the general control of the flat screen.
- This microprocessor is configured so that it can also recognize the video mode set on the computer. If the mode has already been set at the factory or by the user, the flat screen is operated with the stored settings for image position, sampling frequency and phase. If, however, the mode is one that has not yet been implemented in the microprocessor of the flat screen, the standard values for image position, sampling frequency and phase are used. These standard values are not satisfactory in all cases. The adjustment of the sampling clock and the phase have a direct impact on the image quality.
- An optimal sampling frequency is given when the scanning of all pixels, for example a line of a video signal m, follows a stable or characteristic area of these pixels, for example in the middle of each pixel. Then the data conversion brings optimal results.
- the image shown has no interference and is stable.
- the optimal sampling frequency is equal to the pixel frequency. If an incorrect sampling frequency is set, for example if the sampling clock is too fast compared to the pixel clock, the pixels are initially scanned in the permissible range, i.e. in the middle between two edges, but the subsequent pixels become more and more in the direction - Scanned an edge until even the area between two pixels is scanned, which obviously leads to unsatisfactory image quality. The area where the pixels are not sampled in an optimal, characteristic area, incorrect sample values are derived. The picture then shows strong vertical interference. The greater the difference in frequency between the sampling clock and the pixel clock, the more areas with vertical interference are visible on the screen.
- the image quality may suffer if the phase is not set correctly.
- the reason is that the scanning takes place in an area of a pixel that is not ideally suited for the scanning, for example too close to the leading or trailing edge of a pixel.
- This problem can be solved by shifting the phase, that is to say the sampling instant, as a whole until the sampling takes place in a characteristic or permissible region of the pixels. If the phase is not set correctly, the picture quality on the entire screen will be affected by noise signals.
- the users are therefore commonly m the handbooks and prompted by instructions on the packaging, through feeds the erforder ⁇ Liche adjusting the phase itself, but what is unsatisfactory especially for less experienced users.
- the object of the invention is to provide a method and a device for comparing the phase in flat screens, whereby the automatic setting of the phase is possible without the use of test patterns.
- a erfmdungsgelautes method being characterized in that the rising edge of a Vi ⁇ deoimpulses a sufficiently bright pixel is determined that the falling edge of the video pulse is determined in a sufficiently bright pixel and that the phase is adjusted so that the sampling m is placed approximately m in the middle between the rising and falling edge of a video pulse.
- a method according to the invention is further characterized in that the rising flank of a video pulse of a sufficiently bright pixel is determined and that the phase is set such that the sampling time m is shifted approximately half a pixel width m in the direction of the pixel center.
- a method according to the invention is further characterized in that the falling flank of the video pulse is determined in a sufficiently bright pixel and that the phase is set such that the sampling time m is shifted approximately by half a pixel width m in the direction of the pixel center .
- An advantageous embodiment of the method according to the invention wherein the image area with the pixels on the flat screen is arranged m rows and columns between a back-porch area and a front-porch area, is characterized in that as a sufficiently bright pixel for the determination of the rising flank a pixel in the first image column next to the back porch area and a pixel of the first image column next to the front porch area selected as a sufficiently bright pixel for the determination of the falling flank.
- the method can be carried out particularly well if edges which are as pronounced as possible are evaluated or if adjacent areas or points have a very different brightness.
- a point m in the first or last image column is therefore particularly suitable, since in combination with the front or back porch area it fully meets the required conditions and can be found with relatively little effort.
- An advantageous embodiment of the method according to the invention is characterized in that the brightness of a plurality of pixels of the first or last image column is measured and the pixels with the greatest or sufficient brightness m of the first or last image column are selected for determining the rising or falling edge of the video pulse . This ensures that pixels with sufficiently pronounced flanks are used for the measurement.
- a search for suitable pixels is carried out efficiently and in the shortest possible time.
- a vorteilnafte embodiment of the inventive procedural ⁇ proceedings is characterized in that for the determination of ammonium plitudenhongs of the pixel, the phase is delayed until the measured amplitude values is not significantly alter, and that the A then determined plitudenwert further processed.
- an advantageous embodiment of the method according to the invention is characterized in that the phase used in determining the amplitude value is brought forward until the measured amplitude values are less than a predetermined limit value, for example less than 50% of the amplitude value, that the phase is around half a point width is delayed, and that the then measured amplitude value is processed further.
- a predetermined limit value for example less than 50% of the amplitude value
- the two last-mentioned configurations of the method according to the invention are simple solutions to determine the brightness of the pixel as a prerequisite for determining the position of the rising and falling flanks of the pixel.
- a further advantageous embodiment of the invention DA characterized by that, to determine the rising Flan ⁇ the phase so far ke m direction back porch area is moved until the measured amplitude value to a predetermined percentage, for example 50% of the amplitude value previously determined, drops, and that this value of the phase is temporarily stored as the location of the rising edge. Furthermore, an advantageous embodiment of the invention is characterized in that, in order to determine the falling edge, the phase is shifted so far in the direction of the front porch region until the measured amplitude value drops to a predetermined percentage, for example 50% of the previously determined amplitude value, and that this value of the phase is temporarily stored as the location of the falling edge. In this manner and the rising and falling flanks of two pixels are determined in a simple manner, and the phase can then be set so that it lies between the rising and falling flanks m approximately m in the middle of a pixel.
- a predetermined percentage for example 50% of the amplitude value previously determined
- a further advantageous embodiment of the invention is characterized in that the phase or the sampling time is delayed by a predetermined amount, for example 10% of the pixel width, with respect to the center between the rising and the falling edge. This is advantageous to the ⁇ special ring for video signals with Uberschwmgern, since avoided that the scanning takes place in the area of Uberschwmgers.
- the device for comparing the phase between the pixel clock of a graphics card and the sampling clock of a flat screen with an analog interface m a flat screen graphics card computer system characterized by a device that the rising edge of a video pulse is sufficient bright pixel determined, a device that determines the falling edge ⁇ es video pulse m a sufficiently bright pixel, and Emstellem ⁇ chtung with which the phase is set so that the sampling time m approximately m mid between the rising and falling edge of a video pulse becomes.
- a further advantageous embodiment of the device according to the invention is characterized by a device which determines the rising edge of a video pulse of a sufficiently bright pixel, a device which determines the falling edge of the video pulse at a sufficiently bright pixel, and a device with which the phase is set such that the sampling time m is placed approximately m in the middle between the rising and falling edge of a video pulse.
- FIG. 1 shows a block diagram of a flat screen that can be connected to the graphics card of a computer system via an analog interface
- Figures 3A and 3B are schematic representations of video signals
- Figure 4 is a schematic representation of the rising and falling edge of pixels of a video signal
- Figures 5A and 5B schematically show two ideal video signals and the effect of the position of the sampling pulse in relation to the video signal.
- FIG. 1 shows a control circuit for a flat screen that can be connected via an analog interface, the function of which will be explained in more detail below on the basis of the various input signals and their processing.
- the video signal consisting of the three color signals R, G, B and on the other hand the two synchronization signals H-sync and V-sync for the normal and vertical image synchronization.
- H-sync and V sync are transmitted digitally, wherein the signal clamping ⁇ voltage amounts to 0 V or> 3 V.
- the video signal consisting of the color signals R, G, B is an analog signal.
- the signal voltage is in the range of 0 V and 0.7 V.
- the pixel clock i.e. The frequency with which the value of this voltage can change is 80 MHz. Since a certain number of pixels are transmitted per picture line, the pixel clock is higher than the line frequency (H-sync) by the number of these points.
- the three color signals R, B, G of the video signal are supplied to an analog-to-digital converter ADCR, and ADCG ADCB over ei ⁇ NEN video amplifier VA.
- the two synchronization signals H-sync and V-sync are m separate circuits
- HSy, VSy prepared in such a way that the signal edges consumed by the transmission and by various EMC measures are refreshed again.
- These synchronization signals H-sync or V-sync which have been prepared to this extent, are then fed to a microprocessor ⁇ P.
- This microprocessor ⁇ P measures their frequency and uses this to determine the resolution set on the graphics card of the computer system.
- the data stored in each case for the resolution are then sent to a phase locked loop PLL and, in parallel, to a logic circuit implemented in the form of an ASIC
- the phase locked loop PLL multiplies the frequency of the synchronization signal H-sync by the value transferred to it by the microprocessor ⁇ P. In this way, the sampling frequency (pixel clock) is obtained. Due to a delay time caused in the phase locked loop PLL, there arises a phase difference between the pixel clock and the sampling frequency. These two parameters can be influenced via the OSD display on the screen.
- the sampling frequency obtained in the phase locked loop is also fed to the three analog / digital converters ADCR, ADCG, ACDB. These convert the analog data stream with digital data stream.
- the data is finally digxtalInstituten m of the subsequent logic circuit ASIC with the aid of data m a video memory VM contained durver ⁇ operates.
- the video memory VM is often used to achieve a time decoupling between the data coming and the data to be transmitted to the flat screen D.
- the data stored in the video memory VM is also used for the interpolation of low resolutions.
- Figure 2 shows the Ho ⁇ zontal sync signal H-sync and em video signal of one channel, for example a red Farbka ⁇ Nals, R.
- the video signal is m Fig. 2 selected so that alternately bright and dark pixels are shown.
- the dashed lines on the video signal show the ideal sampling times or the ideal phase for the digitization of the analog video data.
- the dashed areas on the first two pixels represent the barely permissible range of the phase for which a still correct scanning is achieved. After the phase has been adjusted, it is therefore on the dashed lines.
- a resolution of, for example, 1024 x 768 pixels (XGA) and a 75 Hz refresh rate a fuzzy and heavily grazing display is obtained even with a phase shift of 4 ns. Therefore, the phase adjustment is crucial for good image quality.
- FIG. 3A shows a fast video signal with an overflow, the area of the sampling between the rising and the falling edge of the video signal being relatively narrow and being shifted in the direction of the falling edge.
- FIG. 3B shows 3B em inert video signal without Uberschwmger, wherein the region is centered relatively wide for the scanning between the rising edge and the falling edge and Wesent ⁇ union in.
- phase positions for example, carry on computationally ⁇ th edge in the region of the falling edge in which Vi ⁇ deosignal in which the measured amplitude values at the carry video signal no longer usable are, while at the same phase position at amplitude values still usable can be measured from the fast video signal.
- the ideal phase position m lies approximately in the middle between the rising and falling edge of the video signal and must also be set to this value. This is why setting the phase dependence on the respective system is so important.
- the edges of the video signals are used to determine the phase position.
- the first requirement is ideally met by the scanning gap in the back and front porch area, the second by a bright pixel. A bright pixel at the beginning of a line is therefore very well suited to the rising edge, one at the end of a line to determine the falling edge.
- the selected pixels should have a sufficiently high intensity in at least one basic color (RGB) so that a flank that is sufficiently large in amplitude is found.
- RGB basic color
- any combination of a light and a dark pixel which can be anywhere in the video signal, is suitable for determining the edges.
- the combination of the front / back porch area and a bright image point m in the first / last image column can be used to determine the desired edges. There is then no need to search the entire image for two suitable pairs of points.
- the ideal range for the sampling of the video signal is that which largely corresponds to the target and actual value of the signal.
- the measurement of the amplitude of the video signal in the area of the flank is depending ⁇ but difficult. The reason for this lies in the jitter of the video signal and the sampling pulse. If this is long compared to the rise or fall time of the video signal, the edge can be found by averaging several measurements, but no statement can be made about the amplitude of the edge at the measured point.
- Figures 5A and 5B illustrate the problem with the detection of the flanks.
- dashed lines are inserted, which are the desired sampling ⁇ point.
- the shaded area represents the th by the jitter at various measurements actually to give ⁇ area represents were averaged the measured values.
- Em Average is the first case of about 80%. You could mistakenly interpret that you are on the leading edge precisely on the spot, has reached at this 80% of Amplitu ⁇ de this mean value. However, this is not the case. In the second case, the statement would be 50%, which is more true. From these results is obvious that it will hardly be possible because of the JIT ters, the location of the edge to ermit ⁇ stuffs where it has reached a certain value. The smallest mistake will usually be made when the measured values are averaged to approx. 50% of the target value. Of course, other values can also be searched. Smaller values have the advantage, for example, that the actual amplitude of the image point has to be determined less precisely.
- the rising edge and the falling edge are determined as follows, the following steps being carried out.
- the actual value of the amplitude can be higher. Determine the actual value of the amplitude by measuring at a suitable sampling time, by delaying the phase until the measured amplitude values no longer increase or by first advancing the phase until the measured amplitude values are very low and this value is Phase that marks the beginning of the edge is still delayed by half the pixel width.
- the sampling time can also be determined by determining the rising edge of a video pulse of a sufficiently bright pixel in the first image column next to the back-porch area and by setting the phase so that the sampling time is approximately half a pixel width is shifted towards the center of the pixel, or alternatively the falling edge of the video pulse is determined in a sufficiently bright pixel in the last image column next to the front porch area, and that
- Phase is set so that the sampling time is shifted approximately half a pixel width towards the center of the pixel. Then steps 1 to 5 described above are simplified accordingly.
- the ideal sampling time lies exactly between the two edges.
- the hardware version of the invention comprises a device which determines the rising edge of a video pulse of a sufficiently bright pixel, a device which determines the falling edge of the video pulse m of a sufficiently bright pixel, an adjusting device with which the phase is set in such a way that the sampling time m is placed approximately m in the middle between the rising and falling edges of a video pulse, and a device for shifting the phase for determining the sampling value of the pixel until the measured amplitude values no longer differ significantly, the then determined sample value is processed further.
- a device which so far prefer the phase used in the determination of the sample until the measured amplitude values less than em pre give ⁇ ner limit, for example less than 50% of the sample and means, which then half the phase by a Pixel width is delayed, and the sample value then measured is processed further.
- a means for averaging the phase to iden ⁇ is the rising edge as far as m the direction of back-Porch- shifts range until the measured amplitude value to egg NEN predetermined percentage, for example 50% of the amplitude value previously determined, falls off, and this value of Phase is temporarily stored as the location of the rising edge, and a device is provided which pushes the phase for determining the falling edge as far as the direction of the front porch area until the measured amplitude value drops to a predetermined percentage, for example 50% of the previously determined amplitude value , this value of the phase being temporarily stored as the location of the falling edge.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Controls And Circuits For Display Device (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Details Of Television Scanning (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19913917 | 1999-03-26 | ||
DE19913917A DE19913917C2 (de) | 1999-03-26 | 1999-03-26 | Verfahren und Einrichtung zum Abgleich der Phase bei Flachbildschirmen |
PCT/DE2000/000835 WO2000058937A1 (de) | 1999-03-26 | 2000-03-17 | Verfahren und einrichtung zum abgleich der phase bei flachbildschirmen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1183676A1 true EP1183676A1 (de) | 2002-03-06 |
Family
ID=7902630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00929227A Withdrawn EP1183676A1 (de) | 1999-03-26 | 2000-03-17 | Verfahren und einrichtung zum abgleich der phase bei flachbildschirmen |
Country Status (7)
Country | Link |
---|---|
US (1) | US6750855B1 (de) |
EP (1) | EP1183676A1 (de) |
KR (1) | KR100437702B1 (de) |
CN (1) | CN1183507C (de) |
DE (1) | DE19913917C2 (de) |
TW (1) | TW559781B (de) |
WO (1) | WO2000058937A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4086479B2 (ja) * | 2001-03-23 | 2008-05-14 | Necディスプレイソリューションズ株式会社 | 画質改善装置および画質改善方法 |
US7034815B2 (en) * | 2001-09-20 | 2006-04-25 | Genesis Microchip Inc. | Method and apparatus for synchronizing an analog video signal to an LCD monitor |
US7009628B2 (en) * | 2001-09-20 | 2006-03-07 | Genesis Microchip Inc. | Method and apparatus for auto-generation of horizontal synchronization of an analog signal to a digital display |
US7091996B2 (en) * | 2001-09-20 | 2006-08-15 | Genesis Microchip Corporation | Method and apparatus for automatic clock synchronization of an analog signal to a digital display |
US6922188B2 (en) * | 2001-09-20 | 2005-07-26 | Genesis Microchip Inc. | Method and apparatus for auto-generation of horizontal synchronization of an analog signal to a digital display |
US7019764B2 (en) * | 2001-09-20 | 2006-03-28 | Genesis Microchip Corporation | Method and apparatus for auto-generation of horizontal synchronization of an analog signal to digital display |
CN100435554C (zh) * | 2003-06-13 | 2008-11-19 | 钰创科技股份有限公司 | 图像信号处理的相位增强导致减弱的相位回复方法及电路 |
EP1977412A1 (de) * | 2006-01-11 | 2008-10-08 | Tte Technology, Inc. | Kontrastverhältnis-verbesserungssystem mit asymmetrisch verzögernder beleuchtungssteuerung |
CN107424550B (zh) * | 2017-02-09 | 2020-04-14 | 北京集创北方科技股份有限公司 | 显示驱动方法及平面显示器 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3914249A1 (de) * | 1989-04-29 | 1990-12-13 | Georg Rudolph | Verfahren und schaltung zur automatischen taktrueckgewinnung |
US5926174A (en) * | 1995-05-29 | 1999-07-20 | Canon Kabushiki Kaisha | Display apparatus capable of image display for video signals of plural kinds |
US5767916A (en) * | 1996-03-13 | 1998-06-16 | In Focus Systems, Inc. | Method and apparatus for automatic pixel clock phase and frequency correction in analog to digital video signal conversion |
US5917461A (en) | 1996-04-26 | 1999-06-29 | Matsushita Electric Industrial Co., Ltd. | Video adapter and digital image display apparatus |
DE19751719A1 (de) * | 1997-11-21 | 1999-05-27 | Thomson Brandt Gmbh | Signalverarbeitungsverfahren für ein analoges Bildsignal |
FR2778044B1 (fr) * | 1998-04-23 | 2000-06-16 | Thomson Multimedia Sa | Procede de recuperation d'horloge lors de l'echantillonnage des signaux de type informatique |
JP3586116B2 (ja) * | 1998-09-11 | 2004-11-10 | エヌイーシー三菱電機ビジュアルシステムズ株式会社 | 画質自動調整装置及び表示装置 |
US6522365B1 (en) * | 2000-01-27 | 2003-02-18 | Oak Technology, Inc. | Method and system for pixel clock recovery |
-
1999
- 1999-03-26 DE DE19913917A patent/DE19913917C2/de not_active Expired - Lifetime
-
2000
- 2000-03-17 CN CNB00805603XA patent/CN1183507C/zh not_active Expired - Fee Related
- 2000-03-17 WO PCT/DE2000/000835 patent/WO2000058937A1/de active IP Right Grant
- 2000-03-17 US US09/926,224 patent/US6750855B1/en not_active Expired - Lifetime
- 2000-03-17 EP EP00929227A patent/EP1183676A1/de not_active Withdrawn
- 2000-03-17 KR KR10-2001-7012270A patent/KR100437702B1/ko active IP Right Grant
- 2000-03-28 TW TW089105459A patent/TW559781B/zh not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0058937A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000058937A1 (de) | 2000-10-05 |
CN1183507C (zh) | 2005-01-05 |
KR20020028867A (ko) | 2002-04-17 |
CN1345435A (zh) | 2002-04-17 |
DE19913917C2 (de) | 2001-01-25 |
US6750855B1 (en) | 2004-06-15 |
TW559781B (en) | 2003-11-01 |
KR100437702B1 (ko) | 2004-06-30 |
DE19913917A1 (de) | 2000-10-05 |
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