CN1315330C - Video-frequency signal processing method and apparatus thereof - Google Patents
Video-frequency signal processing method and apparatus thereof Download PDFInfo
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- CN1315330C CN1315330C CNB031312799A CN03131279A CN1315330C CN 1315330 C CN1315330 C CN 1315330C CN B031312799 A CNB031312799 A CN B031312799A CN 03131279 A CN03131279 A CN 03131279A CN 1315330 C CN1315330 C CN 1315330C
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Abstract
The present invention relates to a video signal processing method and a device thereof. The device is applied to an analog front end device which generates a first color digital signal and a second color digital signal respectively according to a first color analog signal and a second color analog signal. A first color odd signal and a first color even signal are generated according to the first color analog signal, and a second color odd signal and a second color even signal are generated according to the second color analog signal. Under a single channel mode, the first color odd signal or the first color even signal is output as the first color digital signal, and the second color odd signal or the second color even signal is output as the second color digital signal. Under a double channel mode, the first color odd signal and the second color even signal are synchronously output, and the first color even signal and the second color odd signal are synchronously output, wherein the first color digital signal is formed by combining the first color odd signal with the first color even signal, and the second color digital signal is formed by combining the second color odd signal with the second color even signal.
Description
Technical field
The invention relates to a kind of video signal processing method and device thereof, and particularly relevant for a kind of LCD (LCD monitor) video signal processing method and device thereof.
Background technology
For a long time, and cathode ray tube (Cathode Ray Tube, CRT) Display Technique is the main flow of display always, goes through the refining of quenching of many decades, its development of technologies is very ripe.In recent years, because digitized trend of the times, Display Technique has also had sizable change, and digital display is a dark horse, and the situation that replaces CRT monitor is arranged greatly.
Be different from the working method of traditional analog formula display, digital display has replaced the electron beam of CRT monitor with digital signal, therefore can be more frivolous, and also allow the people break away from the puzzlement that radiation and picture flash.Present digital display technique is with liquid crystal display (1iquid crystal display, LCD) and Plasma Display (plasma display panel, PDP) be main flow, for now, be beneficial to that small size shows and domestic TV still under the situation based on CRT at liquid crystal technology, still the application with lcd technology is comparatively extensive on the market.
In application facet such as personal computers,, so after LCD must be digital signal with analog signal conversion, could be shown because the display card (VGAcard) of present many computer systems all can only be exported analog vision signal.For this reason, the video process apparatus of LCD need just unavoidablely AFE (analog front end) (analog front end, AFE) device and ratio processor (scalar), carry out works of treatment such as conversion of signals and convergent-divergent computing.Wherein, analog front-end device is to be used for analog video signal is converted to digital video signal, and the ratio processor is then according to digital video signal computing in addition, to present the video of different resolution.
The function of analog front-end device is that analog red (R), green (G), blue (B) three primary colors vision signal are converted to digital video signal, typical analog front-end device is provided with three cover analog/digital converters 110,130,150, be used for respectively red analog signal RA, green analog signal GA and blue analog signals BA being converted to red digital signal RD, green digital signals GD and blue digital signal BD, as shown in Fig. 1.In analog front-end device, most important parts promptly is an analog/digital converter at a high speed, and its performance will directly influence the LCD picture quality.With 15 o'clock LCD was example, if display mode is 1024 * 768 * 85Hz (an XGA pattern), then analog/digital converter must operate at 94.500MHz, also be that clock generator 170 must be exported the clock signal clks of 94.500MHz to analog/digital converter 110 at this moment, 130,150 for use.Along with the development of lcd technology, have more much sized panel commercializations in the future, (under 1280 * 1024 * 85Hz), the work clock of analog/digital converter will be up to 157.500MHz if 17 o'clock LCD operate in the SXGA pattern.Hence one can see that, and the status of analog/digital converter in analog front-end device of high speed, intermediate-resolution is crucial; Along with the raising of chip degree of integration, present trend is that analog front-end device, ratio processor and other peripheral circuit are incorporated on the same chips, is called the LCD control chip.
Resolution for liquid crystal panel is high more, and then the clock request for analog/digital converter is just high more; Yet, being subject to the support of technology, the analog/digital converter that work clock is higher than certain limiting value is to be difficult to realize.In order to overcome such problem, when design, just can take the circuit framework of alternating expression (interleaved), exchange speed for area.This class practice is that an analog/digital converter that is operated in frequency f is come equivalence with two strange (odd) transducer and idol (even) transducers that are operated in f/2, and analog signal is converted to odd number signal and even signal respectively; Then, utilize a selector (for example multiplexer) that is operated in frequency f to export odd number signal and even signal alternately, can merge into required digital signal two.Please refer to Fig. 2, it shows alternating expression analog/digital converter schematic diagram.The example that is converted to red analog signal RA, strange transducer 211 in the analog/digital converter 210 and even transducer 213 are to work according to clock signal HCLK, be used for red analog signal RA is converted to red odd number signal RDO and red even signal RDE respectively, so the frequency of red odd number signal RDO and red even signal RDE is all identical with clock signal HCLK.Multiplexer 220 switches between strange transducer 211 and even transducer 213 in turn according to clock signal clk, red odd number signal RDO and red even signal RDE can be merged into red digital signal RD output; Wherein, the frequency of clock signal clk is the twice of clock signal HCLK, can be achieved by frequency divider 270.In like manner, strange transducer 231 in the analog/digital converter 230 and even transducer 233 can be converted to green analog signal GA green odd number signal GDO and green even signal GDE, merge into green digital signals GD by multiplexer 240 again; Strange transducer 251 in the analog/digital converter 250 and even transducer 253 can be converted to blue analog signals BA blue odd number signal BDO and blue even signal BDE, merge into blue digital signal BD by multiplexer 260 again.
Briefly, under the alternating expression framework, every analog/digital converter only need be operated in frequency f/2, can be the digital signal of frequency f with the three primary colors analog signal conversion, so can significantly reduce the difficulty of circuit design, its cost be need be bigger circuit area.
Then please refer to Fig. 3, its read clock signal CLK, the sequential chart of HCLK, red odd number signal RDO, red even signal RDE and red digital signal RD, the frequency of clock signal clk is 2 times of clock signal HCLK.As indicated above, red odd number signal RDO is identical with clock signal HCLK with the frequency of red even signal RDE, multiplexer then switches between strange transducer and even transducer alternately according to clock signal clk, red odd number signal RDO and red even signal RDE are merged into red digital signal RD, and the frequency of red digital signal RD is identical with clock signal clk.In like manner, synthetic method green and blue digital signal also is same as red digital signal, just repeats no more.
The three primary colors digital signal all is that odd number signal and the even signal merging that is produced by strange transducer and even transducer forms under high frequency mode, therefore if strange transducer and even transducer because the difference or the circuit framework that other reason causes of technology are asymmetric, just can cause one dense one light microgroove in the gray scale picture.Please refer to Fig. 4, it shows the intensity profile schematic diagram of digital signal reality, on label is set, suppose that singular reference is that the pixel of the odd number signal exported of strange transducer is (as pixel P1, P3, P5, ... P11), and the pixel of the even signal that even-numbered is the odd even transducer to be exported (as pixel P2, P4, P6 ... P12).In theory, each pixel value all should drop on horizontal online (shown in 4A figure), but because the circuit framework of strange transducer and even transducer is asymmetric, just the phenomenon that pixel value and theoretical value are not inconsistent can take place.In some cases, for example in the present embodiment, its pixel value of pixel that the odd transducer output of institute belongs to the odd number signal can take place, and all to export its pixel value of pixel that belongs to even signal than theoretical value by high odd transducer be that (or its value of pixel of the lower even number of its value of the pixel of odd number is higher for low situation than theoretical value all, different according to the side circuit design), thus, just produced deep or light staggered microgroove in the gray scale picture.Certainly, odd number signal or even signal are inevitable to have error (meaning be odd number signal or even signal one of them may conform to theoretical value) with theoretical value, but with regard to export with regard to the identical pixel value, the result of odd number signal and even signal is error to some extent, and Here it is causes the main cause of gradation unequal.
Such problem has directly influenced video quality certainly, and is especially obvious especially in the more simple picture of the lower display mode of frequency or background, and discovered by the user.Therefore in order to allow screen have better display effect, be necessary to find the root of problem and thoroughly solution in fact, to promote the rating quality.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of video signal processing method and device thereof exactly, to solve the microgroove phenomenon of gradation unequal.
Purpose according to the present invention proposes a kind of video signal processing method and device thereof, to be applied in the analog front-end device.Wherein according to the first look analog signal and the second look analogue signal generating, the first chromatic number word signal and the second chromatic number word signal, this video signal processing method may further comprise the steps analog front-end device respectively:
At first, according to the first look analogue signal generating, the first look odd number signal and the first look even signal, and according to the second look analogue signal generating, the second look odd number signal and the second look even signal.Under the single-channel mode, export as the first chromatic number word signal with the first look odd number signal or the first look even signal, and to export as the second chromatic number word signal between the second look odd number signal or the second look even signal.Under the dual-channel mode, export the first look odd number signal and the second look even signal synchronously, also export the first look even signal and the second look odd number signal synchronously; Wherein, the first chromatic number word signal is to be merged by the first look odd number signal and this first look even signal to form, and the second chromatic number word signal is to be merged by the second look odd number signal and the second look even signal to form.
Description of drawings
Fig. 1 shows traditional analog/digital converter schematic diagram.
Fig. 2 shows traditional alternating expression analog/digital converter schematic diagram.
The sequential chart of Fig. 3 read clock signal, red odd number signal, red even signal and red digital signal.
Fig. 4 shows the intensity profile schematic diagram of digital signal reality.
Fig. 5 shows the video signal processing method schematic diagram according to preferred embodiment of the present invention provided.
Fig. 6 shows the analog front-end device calcspar according to preferred embodiment of the present invention provided.
The drawing reference numeral explanation
110,130,150: analog/digital converter
170: clock generator
210,230,250: analog/digital converter
211,231,251: strange transducer
213,233,253: even transducer
220,240,260: multiplexer
270: frequency divider
610,630,650: analog/digital converter
611,631,651: strange transducer
613,633,653: even transducer
620,640,660: multiplexer
670: control module
RA: red analog signal
GA: green analog signal
BA: blue analog signals
RD: red digital signal
GD: green digital signals
BD: blue digital signal
CLK, HCLK: clock signal
RDO: red odd number signal
RDE: red even signal
GDO: green odd number signal
GDE: green even signal
BDO: blue odd number signal
BDE: blue even signal
P1, P2, P3, P4, P5, P6, P7, P8: pixel
P9, P10, P11, P12, P13, P14, P15, P16: pixel
MODE: mode parameter
CS1, CS2: control signal
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
After finding out the reason of distortion, hereinafter will seek way to solve the problem respectively at low frequency display mode and high frequency display mode.
Under low frequency mode, because the arithmetic speed of circuit is enough fast, therefore can make circuit working in single-channel mode (single channel mode),, only utilize another transducer to carry out the work of analog/digital conversion strange transducer or one of them forbidding of even transducer (disable); Cover (RGB) this moments three in commission strange (or idol) transducer is full speed operation, and its equivalent electric circuit is as shown in Fig. 1.Because only selected strange transducer or even transducer come work under this pattern, therefore do not have the asymmetry problem between odd number signal and even signal, the microgroove that does not also just have gradation unequal produces.It should be noted that three cover analog/digital converters preferably do same selection, selected strange simultaneously (or idol) transducer is carried out data processing, and the output result who makes red, green, blue chromatic number word signal is reaching unanimity property more.
Under high frequency mode, because the arithmetic speed deficiency of single transducer, so need alternately signal strange, that even transducer is exported to be merged rapidly, be dual-channel mode (dual channel mode) this moment.But exist asymmetric problem between odd number signal and even signal really, the present invention adopts the method for compensation to reduce influence degree, to improve image quality.Please refer to Fig. 5, it shows the video signal processing method schematic diagram according to preferred embodiment of the present invention provided.Each pixel of LCD screen is actually by three sub-pixels (sub-pixel) such as redness, green and bluenesss and is constituted, and each sub-pixel then demonstrates corresponding color according to odd number signal or even signal; Because asymmetric in the red, green, blue three cover analog/digital converters between strange transducer and even transducer usually is consistent (i.e. the strange transducer of three covers redness, green, the blue odd number signal while of exporting export greater than even transducer redness, green, blue even signal), therefore visually cause the effect (denseer, the light person of dense person is lighter) of reinforcement, make the situation of gradation unequal more obvious.For solving such problem, odd number signal and the even signal with the red, green, blue sub-pixels in the pixel can be staggered, the error compensation between strange, even signal is come.Vision is responsive to green for example, can allow redness and blue subpixels export similar signal, the signal that green sub-pixels output is another kind of.For example among the pixel P1, red sub-pixel shows according to blue odd number signal BDO (1) according to green even signal GDE (1) demonstration, blue subpixels according to red odd number signal RDO (1) demonstration, green sub-pixels; Among the pixel P2, red sub-pixel shows according to blue even signal BDE (1) according to green odd number signal GDO (1) demonstration, blue subpixels according to red even signal RDE (1) demonstration, green sub-pixels; Among the pixel P3, red sub-pixel shows according to blue odd number signal BDO (2) according to green even signal GDE (2) demonstration, blue subpixels according to red odd number signal RDO (2) demonstration, green sub-pixels.In other words, with regard to analog front-end device, can be at time t (n) synchronous output red odd number signal RDO (1), green even signal GDE (1) and blue odd number signal BDO (1), at time t (n+1) synchronous output red even signal RDE (1), green odd number signal GDO (1) and blue even signal BDE (1), at time t (n+2) synchronous output red odd number signal RDO (2), green even signal GDE (2) and blue odd number signal BDO (2), LCD then shows corresponding picture according to the output signal of analog front-end device.Because in three sub-pixels with pixel, and nonuniformity ground shows according to odd number signal or even signal entirely, therefore can be strange, the difference compensation between even signal most, improve the phenomenon of gradation unequal.
For realizing above-mentioned conception, can in circuit, add control module, select analog/digital converter according to single channel or dual-channel mode work according to mode parameter, and allow red, green, blue chromatic number word signal compensate mutually, reach the purpose that reduces distortion.Please refer to Fig. 6, it shows the analog front-end device calcspar according to preferred embodiment of the present invention provided.Dispose analog/digital converter 610 in the analog front-end device, 630,650, be used for red analog signal RA, green analog signal GA, blue analog signals BA are carried out digital translation, multiplexer 620 can be merged into red digital signal RD alternately with red odd number signal RDO and red even signal RDE, multiplexer 640 can be merged into green digital signals GD alternately with green odd number signal GDO and green even signal GDE, and multiplexer 660 can be merged into blue odd number signal BDO and blue even signal BDE alternately and be blue digital signal BD.Under the low frequency mode, mode parameter MODE can be made as 1 and feed-in control module 670 in, control module 670 just according to mode parameter MODE with control signal CS1 feed-in idol transducer 613,633,653 make its forbidding, and utilize control signal CS2 feed-in multiplexer 620,640,660 taking out red odd number signal RDO, green odd number signal GDO and blue odd number signal BDO, with as red digital signal RD, green digital signals GD and blue digital signal BD.Because this moment, each passage only utilized strange transducer to be responsible for conversion of signals work, so the frequency of clock signal HCLK is identical with clock signal clk.Certainly, on the practice, also can make strange transducer forbidding to utilize even transducer 613,633,653 carry out conversion of signals work, adopt red even signal RDE, green even signal GDE and blue even signal BDE as red digital signal RD, green digital signals GD and blue digital signal BD, just repeat no more.
Under the high frequency mode, mode parameter MODE can be made as 0 and feed-in control module 670 in, control module 670 can remove 2 with clock signal clk becomes clock signal HCLK feed-in analog/digital converter 610,630,650, and set strange transducer 611 by control signal CS1,631,651 and even transducer 613,633,653 all in running order.On the other hand, control signal CS2 may command multiplexer 620,640,660, allow red odd number signal RDO, green even signal GDE and blue odd number signal BDO export synchronously, red even signal RDE, green odd number signal GDO and blue even signal BDE export synchronously, purpose strange to realize, that even signal compensates mutually.
In addition, still there are some alternate manners can realize this circuit, for example will be arranged in the analog/digital converter except that 2 circuit, or with mode parameter MODE at multiplexer 620, realize in 640,660, or clock generator 170 carries out two frequencys multiplication earlier and removes 2 or the like by analog/digital converter again.Moreover, also can be when dual-channel mode, comprise Delta-sigma (delta sigma) modulator or choose the odd number signal randomly or even signal is exported in control module 670 with random number, make naked eyes be difficult for differentiating difference between two signals.
Video signal processing method that the above embodiment of the present invention discloses has the following advantages at least: one, export the three primary colors digital signal with single-channel mode under the low frequency, can avoid the microgroove of gradation unequal fully.
Two, under the high frequency odd number signal and even signal are exported synchronously, can effectively be compensated two errors between signal, lower the distortion of picture.
In sum; though the present invention discloses as above with preferred embodiment; yet; it is not to be used to limit the present invention; any those skilled in the art; under the premise without departing from the spirit and scope of the present invention, can carry out various more should and modification, so protection scope of the present invention should with the back appended claim was limited is as the criterion.
Claims (11)
1. video signal processing method, be applicable to analog front-end device, this analog front-end device is respectively according to the first look analog signal and the second look analogue signal generating, the first chromatic number word signal and the second chromatic number word signal, wherein, this first chromatic number word signal is made up of the first look odd number signal and the first look even signal, this second chromatic number word signal is made up of the second look odd number signal and the second look even signal, and this video signal processing method may further comprise the steps:
According to this first look odd number signal of this first look analogue signal generating and this first look even signal;
According to this second look odd number signal of this second look analogue signal generating and this second look even signal;
Export this first look odd number signal and this second look even signal synchronously; And
Export this first look even signal and this second look odd number signal synchronously.
2. video signal processing method as claimed in claim 1, wherein this first look analog signal is respectively two different among red analog signal, green analog signal and the blue analog signals three with this second look analog signal.
3. video signal processing method, be applicable to analog front-end device, according to the first look analog signal and the second look analogue signal generating, the first chromatic number word signal and the second chromatic number word signal, this video signal processing method may further comprise the steps this analog front-end device respectively:
According to this first look analogue signal generating, the first look odd number signal and the first look even signal;
According to this second look analogue signal generating, the second look odd number signal and the second look even signal;
Export this first chromatic number word signal and this second chromatic number word signal according to mode parameter, wherein, step a below carrying out when this mode parameter is single-channel mode (single channel mode), the step m below carrying out when this mode parameter is dual-channel mode (dual channel mode);
A selects an output with as this first chromatic number word signal between this first look odd number signal and this first look even signal, selects an output with as this second chromatic number word signal certainly between this second look odd number signal and this second look even signal; And
M exports this first look odd number signal and this second look even signal synchronously, export this first look even signal and this second look odd number signal synchronously, wherein, this first chromatic number word signal is made up of this first look odd number signal and this first look even signal, and this second chromatic number word signal is made up of this second look odd number signal and this second look even signal.
4. video signal processing method as claimed in claim 3, wherein the first look analog signal respectively is two different among red analog signal, green analog signal and the blue analog signals three with the second look analog signal.
5 one kinds of analog front-end devices comprise:
A plurality of analog/digital converters, each described analog/digital converter comprises:
First transducer;
With second transducer, wherein this first and second transducer is to receive analog signal, and exports corresponding first digital signal and second digital signal respectively; And
Multiplexer is used to receive this first digital signal and this second digital signal, and selects the output of this first and second digital signal according to control signal; And
Control module is used to produce this control signal.
6. device as claimed in claim 5, wherein this control signal is the output that is used for alternately selecting this first and second digital signal.
7. device as claimed in claim 5, wherein these analog/digital converters comprise the first look analog/digital converter and the second look analog/digital converter, control the second chromatic number word signal Synchronization output of the first chromatic number word signal and this second look analog/digital converter of this first look analog/digital converter by this control signal.
8. device as claimed in claim 5, wherein this control module comprises Delta-sigma modulator.
9. device as claimed in claim 5, wherein this control signal is to be used for the output that random number is selected this first and second digital signal randomly.
10. analog front-end device comprises:
First analog/digital converter; With
Second analog/digital converter;
Wherein, this first and this second analog/digital converter all comprise:
First transducer; And
Second transducer, wherein this first with this second transducer be to be used to receive analog signal, and export corresponding first digital signal and second digital signal respectively, and this first digital signal is greater than this second digital signal; And
Multiplexer is used to receive this first digital signal and this second digital signal, and selects the output of this first and second digital signal according to control signal;
Wherein, can make this first analog/digital converter export this first digital signal by this control signal, and this second analog/digital converter is exported this second digital signal.
11. as the device of claim 10, wherein this analog front-end device is to be used for LCD control chip (ICD controller).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB031312799A CN1315330C (en) | 2003-05-12 | 2003-05-12 | Video-frequency signal processing method and apparatus thereof |
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| CNB031312799A CN1315330C (en) | 2003-05-12 | 2003-05-12 | Video-frequency signal processing method and apparatus thereof |
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| CN1315330C true CN1315330C (en) | 2007-05-09 |
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| CN101742134B (en) * | 2008-11-25 | 2012-06-27 | 瑞昱半导体股份有限公司 | Signal processing method and device for generating offset result by utilizing odd-even field synchronous data |
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|---|---|---|---|---|
| CN1189045A (en) * | 1997-01-20 | 1998-07-29 | 明碁电脑股份有限公司 | Double-image display device and method |
| CN1189277A (en) * | 1995-06-29 | 1998-07-29 | 摩托罗拉公司 | Method of generating high-resolution video |
| CN1254240A (en) * | 1998-11-17 | 2000-05-24 | 天津三维显示技术有限公司 | Flickerless full-compatible all-system stereo TV technique |
| CN1281155A (en) * | 1999-06-04 | 2001-01-24 | 权五敬 | Actuator of liquid crystal display device |
| US6429904B2 (en) * | 1996-10-15 | 2002-08-06 | Fairchild Semiconductor Corporation | Method for converting analog video signal to digital video signal |
-
2003
- 2003-05-12 CN CNB031312799A patent/CN1315330C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189277A (en) * | 1995-06-29 | 1998-07-29 | 摩托罗拉公司 | Method of generating high-resolution video |
| US6429904B2 (en) * | 1996-10-15 | 2002-08-06 | Fairchild Semiconductor Corporation | Method for converting analog video signal to digital video signal |
| CN1189045A (en) * | 1997-01-20 | 1998-07-29 | 明碁电脑股份有限公司 | Double-image display device and method |
| CN1254240A (en) * | 1998-11-17 | 2000-05-24 | 天津三维显示技术有限公司 | Flickerless full-compatible all-system stereo TV technique |
| CN1281155A (en) * | 1999-06-04 | 2001-01-24 | 权五敬 | Actuator of liquid crystal display device |
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