CN100373431C - Addressing method and device of plasma display device - Google Patents
Addressing method and device of plasma display device Download PDFInfo
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- CN100373431C CN100373431C CNB2004100662681A CN200410066268A CN100373431C CN 100373431 C CN100373431 C CN 100373431C CN B2004100662681 A CNB2004100662681 A CN B2004100662681A CN 200410066268 A CN200410066268 A CN 200410066268A CN 100373431 C CN100373431 C CN 100373431C
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Abstract
The present invention relates to a plasma display addressing method and an addressing device. The plasma display addressing method is a time-dividing plasma display driving method by dividing a picture time into a plurality of subfields. The plasma display addressing method comprises the following step: the same data is provided for at least two lines in the subfields set with low weighted value of the subfields for seeking cell bodies. The running condition of the present invention is that as follows: the same data is provided for at least two lines in the subfields set with low weighted value of the subfields for seeking cell bodies. The present invention can reduce the addressing time of a plasma display by adopting a single scanning mode.
Description
(1) technical field
The present invention is about using single scanning, and can reduce a kind of plasma display addressing method and the device of addressing time.
(2) background technology
Plasma display (PLASMA DISPLAY PANEL: to call " PDP " in the following text) is to utilize He+Xe, and the ultraviolet ray of being sent during the mixed gas discharge of inert gases such as Ne+Xe and He+Ne+Xe makes light-emitting phosphor, display image.This PDP can not only be easy to be done ultra-thinization and maximization, and by means of the exploitation of technology recently, it can also increase substantially image quality.Recently, 3 electrodes that utilize on dielectric accumulation wall electric charge the to reduce driving voltage exploitation and the experiment work that exchange surface discharge type PDP launched widely.
With reference to Fig. 1 as can be known, original 3 electrodes exchange surface discharge type PDP and keep electrode (Z) and place discharge space n scan electrode (Y1 to Yn) and n are individual, and intersect with m data electrode (X1 to Xm), and its crossover sites is formed by m * n cell cube 1.For the mixing of electricity and optics between the cell cube 1 that prevents to close on, set up spaced walls 2 in the level of closing between the data electrode (X1 to Xm).
Scan electrode (Y1 to Yn) is kept pulse and is approved as common behind the sweep trace of having selected by the approval of direction successively sweep signal, causes that selected cell cube keeps discharge.Keep electrode (Z) pulse of keeping of keeping pulse and replacing of supplying with scan electrode (Y1 to Yn) is approved, and cause the discharge of keeping of selected cell cube.Each data electrode (X1 to Xm) is to approving with the pulse of sweep signal data in synchronization, and selected cell body 1.
PDP is in order to embody the gray scale of picture, with time (the NTSC mode: 16.67ms) be divided into a plurality of sons field that discharge time has nothing in common with each other, and carry out the time-division driving of a picture.Each son is also satisfying to be divided into following three periods: whole image is carried out initialized restarting the phase (reset period); Select sweep trace, and from selecteed sweep trace, select the address period (address period) of cell cube; Keep the phase (perhaps claiming the demonstration phase) (sustain period) according to what discharge time came representing gradation.For example, if utilize 265 gray scale to come display frame, just an image time (16.67ms) shown every 1/60 second to be divided into as shown in Figure 28 sons (SF1 to SF8).8 sons (SF1 to SF8) are divided into the phase of restarting, address period again as stated like that respectively, keep phase and erasing period.The phase of restarting of each son field all is identical with address period, and in contrast, in the demonstration time, phase of keeping of each son field and discharge time thereof are according to 2
nThe ratio of (here, n=0,1,2,3,4,5,6,7) increases successively.Before the phase of restarting, in the cell cube the residual wall electric charge that causes by keeping discharge wipe.
Fig. 3 is that summary shows existing single scanning mode plasma display apparatus component drawings.
With reference to Fig. 3 as can be known, existing single scanning mode plasma display apparatus is by constituting with the lower part: the data-driven loop 31 that video data is provided to each data electrode (X1 to Xn) of PDP30; To the turntable driving loop 32 that each scan electrode (Y1 to Yn) provides initializing signal and scanning impulse and keeps pulse; Provide and keep keeping of pulse and drive loop 33 to the common electrode (Z) of keeping.In PDP (30), each data electrode (X1 to Xm) is installed on the lower panel.Simultaneously, in PDP (30), scan electrode (Y1 to Yn) and the common electrode (Z) of keeping are installed on the top panel, and (X1 to Xm) intersects with data electrode.
Data driven unit 31 and the scanning impulse synchronised that is provided to each scan electrode (Y1 to Yn) successively provide video data to each data electrode (X1 to Xm).
In the phase of restarting, for whole image is carried out initialization, turntable driving loop 32 provides waveform that tilts (Ramp-up) and the waveform that has a down dip (Ramp-down) to each scan electrode (Y1 to Yn) simultaneously.Simultaneously, in address period, turntable driving loop 32 provides scanning impulse to each scan electrode (Y1 to Yn) successively.
In the phase of keeping, turntable driving loop 32 and keep and drive loop 33 operations alternate with each other provides and keeps pulse to scan electrode (Y1 to Yn) and the common electrode (Z) of keeping.
Fig. 4 is the oscillogram that shows existing single scanning mode plasma display drive waveforms.
With reference to Fig. 4 as can be known, in the phase of restarting, all scan electrodes (Y) are approved waveform that tilts (Ramp-up) and the waveform that has a down dip (Ramp-down) simultaneously.Cause faint discharge in the whole image cell cube by the waveform that tilts (Ramp-up), its result generates the wall electric charge in the whole image cell cube.The waveform (Ramp-down) that has a down dip causes faint erasure discharge in each cell cube, thereby unnecessary unnecessary charge erasure in wall electric charge that will be generated by SETUP discharge and the space charge makes in the whole image cell cube the unwanted wall electric charge of address discharge institute evenly residual.
In address period, (scn) be scanned electrode (Y) successively and approve, simultaneously, (scn) synchronous, data electrode (X) is approved the data pulse (data) of band positive polarity to the scanning impulse of band negative polarity with scanning impulse.With scanning impulse (scn) and the voltage difference between the data pulse (data) compare with the wall voltage that the phase of restarting is generated, to carry out address discharge in the approved cell cube of data pulse (data).
On the other hand, in the waveform that has a down dip (Ramp-down) period and address period are provided, be to press (Zdc) to keep electrode (Z) direct current of band positive polarity being provided.
In the phase of keeping, each scan electrode (Y) and keep electrode (Z) alternately approval keep pulse (Sus).Keep pulse (Sus) when being approved at each, will be by keeping the wall voltage in the selected cell cube of discharge and keeping the addition of pulse (sus) voltage, at scan electrode (Y) with keep between the electrode (Z) and to cause with face discharge form and to keep discharge, when the phase of keeping finishes, can provide to have the erase signal of wiping the tilt waveform form of keeping discharge.
This single scanning mode can scan with inverse direction successively shown in the dotted line of Fig. 3.
Simultaneously, existing P DP increases the video picture degree by increasing line number and cell cube number, and increases the son field in order to reduce profile noise (contour noise), and the problem of Cun Zaiing is to be difficult to fully guarantee the phase of keeping (demonstration phase) in this case.
For example, for the video picture degree of VGA (640 * 480) level, the erasing period time of restarting before the phase is equivalent to 8 (sub-number) * 0.2[ms in an image time (16.67[ms])]=1.6[ms].Simultaneously,, restart time phase nearly 2[ms in an image time for the video picture degree of VGA level], the address period time is equivalent to 480 (horizontal line quantity) * 8 (a son number) * 1.8 μ s=6.9[ms in an image time].Therefore, for the PDP of VGA level, the time phase of keeping that image time can be guaranteed is approximately 6[ms] about.
In addition, if the video picture degree is enhanced XGA (1024 * 768) level, rely on the single scanning mode almost can't guarantee to keep time phase.For example, for VGA level video picture degree, the time of restarting of a picture is approximately 2[ms], the address period time of a picture is approximately 480 (horizontal line number) * 8 (a son number) * 1.8 μ s=6.9[ms].Therefore, for the PDP of VGA group, the time phase of keeping that can guarantee in an image time is 6[ms only].
Therefore, the PDP of XGA level takes two scan modes to drive as shown in Figure 5.
With reference to Fig. 5 and Fig. 6 as can be known, the PDP device of two scan modes is made of following each several part: the 1st data-driven loop 41A that video data is provided to the data electrode (Xt1 to Xtm) that is installed in PDP (40) first half; The 2nd data-driven loop 41B of video data is provided to the data electrode (Xb1 to Xbm) that is installed in PDP (40) Lower Half; To the turntable driving loop 42 that scan electrode (Y1 to Yn) provides initializing signal (restarting signal) and scanning impulse and keeps pulse; Provide and keep keeping of pulse and drive loop 43 to the common electrode (Z) of keeping.
In PDP (40), the data electrode (Xt1 to Xtm, Xb1 to Xbm) that separates from middle body is installed on the lower panel, thereby can provide different data to the first half and Lower Half simultaneously.Simultaneously, in PDP (40), scan electrode (Y1 to Yn) and the common electrode (Z) of keeping are installed on the top panel, intersect with data electrode (Xt1 to Xtm, Xb1 to Xbm).
The 1st data-driven loop 41A provides scanning impulse (scn) to the 1st to n/2 scan electrode (Y1 to Y2/n) successively, and synchronous with it, provides video data to top data electrode (Xt1 to Xtm).
The 2nd data-driven loop 41B provides scanning impulse (scn) to n/2 to the n scan electrode (Y2/n to Yn) successively, and synchronous with it, provides video data to bottom data electrode (Xb1 to Xbm).
Turntable driving loop 42 provides waveform that tilts (Ramp-up) and the waveform that has a down dip (Ramp-down) to scan electrode (Y1 to Yn) simultaneously in the phase of restarting.Simultaneously, the first half and the latter half of PDP (40) scanned in turntable driving loop 42 simultaneously in address period.At this moment, it also provides scanning impulse (scn) to an electrode that is present in PDP (40) the first half with an electrode that is present in PDP (40) the latter half simultaneously.
In the phase of keeping, turntable driving loop 42 and keep and drive loop 43 operations alternate with each other provides and keeps pulse (SUS) to scan electrode (Y1 to Yn) and the common electrode (Z) of keeping.
Two scan modes can be with the first half and the latter half of the scanning PDP of inverse direction successively (40) shown in the dotted line of Fig. 5.
This pair of scan mode compared with the single scan mode with same video picture degree, though the addressing time has approximately been reduced by 1/2 degree, but, the data-driven loop 41B that it need be used to drive the data-driven loop 41A of the first half data electrode and be used to drive the latter half data electrode, therefore, its problem of existing is that the quantity of the integrated circuit in top integrated data-driven loop obviously increases.
(3) summary of the invention
To the objective of the invention is in order addressing the above problem, a kind of plasma display that relies on the single scanning mode to reduce the address period time (PDP) addressing method and device to be provided.
To achieve these goals, plasma display (PDP) addressing method according to the present invention the 1st embodiment may further comprise the steps: be set in each son field in the son field of low weighted value, at least supply with same data to plural line, thereby find the cell cube step.
Above-mentioned PDP addressing method also comprises calculates two picture data mean value steps.
Above-mentioned PDP addressing method also comprises selects step with mean value as above-mentioned data.
According to the present invention, the above-mentioned son field that is set to low weighted value is that weighted value is set to the son field below ' 8 '.
PDP addressing method according to the present invention the 2nd embodiment comprises following two steps: calculate two the same data line mean value of picture steps; At least provide mean value to plural line, and selected cell body step.
PDP device for addressing according to the present invention the 1st embodiment comprises with the lower part: in each son field, the son field that is set as low weighted value provides same data to plural line at least, and cell cube is carried out the addressing loop of addressing.
Above-mentioned addressing loop has the average data calculation element of calculating two picture data mean values.
The present invention has above-mentioned addressing loop and selects the feature of mean value as above-mentioned data.
Above-mentioned addressing loop has following feature: simultaneously provide scanning impulse with data sync to plural line at least.
According to the PDP device for addressing of the present invention the 2nd embodiment by constituting with the lower part: the average data calculation element of calculating two same data line mean values of picture; At least provide mean value to plural line, and the addressing loop of selected cell body.
Effect of the present invention:
As mentioned above, add average data simultaneously to two lines, PDP is scanned, can reduce the time of address period in substantial single scanning mode according to PDP addressing method of the present invention and device.Simultaneously, utilize two data between picture, carry out the two scannings of line, only the low-light level weighted value is implemented the two scannings of above-mentioned line, can make the low situation incidence of display quality become minimum according to PDP addressing method of the present invention and device.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 shows that existing 3 electrodes exchange the electrode plane planimetric map of surface discharge type plasma display.
Fig. 2 is the pie graph that shows a picture of existing plasma display.
Fig. 3 is that summary shows existing single scanning mode plasma display apparatus component drawings.
Fig. 4 is the oscillogram that shows existing single scanning mode plasma display drive waveforms.
Fig. 5 is that summary shows existing pair of scan mode plasma display apparatus component drawings.
Fig. 6 is the oscillogram that shows existing single scanning mode plasma display drive waveforms.
Fig. 7 is that summary shows the plasma display device for addressing component drawings according to the embodiment of the invention.
Fig. 8 is the average data figure that picture memory and average it is calculated that the output of device in the displayed map 7.
Fig. 9 is the oscillogram of device for addressing drive waveforms in the displayed map 7.
Figure 10 shows that carrying out the two low weighted value fields of scanning of line implements illustration.
Accompanying drawing major part symbol description
30,40,80: plasma display 31,41A, 41B, 77: the data-driven loop
32,42,78: turntable driving loop 33,43,79: keep driving the loop
71: gamma and gain adjustment device 72: error diffusion and dithering process device
73: picture memory 74: the average data calculation element
75: display data processing apparatus 76: a son mapping device
(5) embodiment
Below with reference to Fig. 7 to Figure 10, the embodiment of plasma display addressing method of the present invention and device is elaborated.
With reference to Fig. 7 as can be known, according to the PDP device for addressing of the embodiment of the invention by constituting with the lower part: the average data calculation element 74 of calculating two data mean values that in two image times, vertically close on; The data-driven loop 77 of average data is provided to PDP 80 by a display data processing apparatus 75 and a son mapping device 76; The turntable driving loop 78 that PDP80 is scanned successively.
PDP80 is twoly kept electrode, is twoly kept the addressing electrode 83 that electrode intersects and formed with this by what comprise scan electrode 81 and keep electrode 82.Two cross sections of keeping electrode and addressing electrode 83 are with the matrix form discharge cell body that distributing.
Digital of digital video data (RGB) is imported in the average data calculation element 74 by gamma and gain regulator 71 and error diffusion and dithering process device 72.
Gamma and gain regulator 71 are adjusted the gamma and the gain of digital of digital video data (RGB) respectively.
Error diffusion and dithering process device 72 utilize the quantized error composition of the digital of digital video data (RGB) that Floyd-steinberg error diffusion wave filter etc. exported gamma and gain regulator 71 to be diffused in the pixel data that closes on.Simultaneously, error diffusion and dithering process device 72 utilizes the dither mask of having set threshold value corresponding to each pixel that the data of being imported are carried out criticalization and dithering process.
Average data calculation element 74 is calculated the mean value of each odd number horizontal line data and even number horizontal line data in two picture datas respectively, and with the mean value sum calculated as the data output that closes on two lines.For example, shown in Fig. 8 and data type 1, (at this moment average data calculation element 74 calculates n-1, n is the positive integer more than 2) the 1st and the 2nd line data (HL1 of individual picture, HL2) mean value is calculated the 1st and the 2nd line data (HL1, mean value HL2) of n picture again.Simultaneously, average data calculation element 74 is the n-1 that calculated respectively and the mean value addition of n picture, and with it with as the 1st and the 2nd data (tar1) output of picture 1.Equally, shown in Fig. 8 and mathematical expression 2, average data calculation element 74 is calculated the 1st and the 2nd line data (HL1 of n picture, HL2) mean value, and calculate the 1st and the 2nd line data (HL1 of n+1 picture, HL2) mean value, and with 1st and 2nd data (tar2) output of the data after the mean value addition of n picture being calculated and n+1 picture as the 2nd picture.
[mathematical expression 1]
[mathematical expression 2]
In mathematical expression 1 and 2, ' pre1 ' and ' pre2 ' represents the data of the 1st and the 2nd line of n-1 picture respectively, and ' cur1 ' and ' cur2 ' represents the data of the 1st and the 2nd line of n picture respectively.Simultaneously, ' nxt1 ' and ' nxt2 ' then represents the 1st and the 2nd line data of picture respectively.
When explicit identification on black background, 75 pairs of data of display data processing apparatus are carried out diminuendo (fadeout) and are handled, and the brightness that makes sign is step-down gradually, and final the disappearance.
A son mapping device 76 will be from the sub-field mode of the data map that receives for setting in advance of display data processing apparatus 75.The data that a son mapping device 76 is exported are provided for data-driven loop 77.
The data of the 77 pairs of outputs from a son mapping device 76 in data-driven loop lock, and the data after will locking offer the addressing electrode 83 of PDP80 according to the standard of 1 leveled time, 1 line.
Restarting scanning impulse in the pulse, address period, keeping the scan electrode 81 that pulse and erase signal offer PDP80 of keeping in the phase of phase will be restarted in turntable driving loop 78.
Keep driving loop 79 and turntable driving loop 78 alternate runs, provide and keep pulse to the electrode 82 of keeping of PDP80.
What Fig. 9 showed is the drive waveforms of PDP device for addressing as shown in Figure 7.
With reference to Fig. 9 as can be known, in the phase of restarting, all scan electrodes (Y) are approved tilt waveform (Ramp-up) and the waveform that has a down dip (Ramp-down) simultaneously according to PDP device for addressing of the present invention.Cause faint discharge in the whole image cell cube by the waveform that tilts (Ramp-up), consequently in the whole image cell cube, generate the wall electric charge.The waveform (Ramp-down) that has a down dip causes faint erasure discharge in each cell cube, thereby unnecessary unnecessary charge erasure in wall electric charge that will be generated by SETUP discharge and the space charge makes in the whole image cell cube the unwanted wall electric charge of address discharge institute evenly residual.
In address period, the scanning impulse (scn) of band negative polarity is approved in turntable driving loop 78 successively by per two alignment scan electrodes (Y1 to Yn).The direction of scanning is shown in the dotted line of Fig. 7, according to from top to bottom direction successively or all possible according to inverse direction successively from the bottom to top.In address period, synchronous with the scanning impulse that provides simultaneously to per two lines, the average data (Adata) that average data calculation element 74 is exported in data-driven loop 77 offers addressing electrode (X1 to Xm).
Scanning impulse (scn) with the voltage difference of average data pulse (Adata) with restart the wall voltage addition that is generated in the phase, is caused in the cell cube that data pulse (data) approved and carries out address discharge.
In the phase of keeping, each scan electrode (Y1 to Yn) and keep electrode (Z) alternately approval keep pulse (Sus).Keep pulse (Sus) when being approved at each, will be by keeping the wall voltage in the selected cell cube of discharge and keeping the addition of pulse (sus) voltage, at scan electrode (Y) with keep between the electrode (Z) and to cause with face discharge form and to keep discharge, when the phase of keeping finishes, can provide to have the erase signal of wiping the tilt waveform form of keeping discharge.
Identical with it, simultaneously two lines are scanned (line doubling scan) according to PDP addressing method of the present invention and device, simultaneously identical with the single scanning mode, reduce address period by scanning successively, compare with two scan modes, it can reduce the quantity in unnecessary driving loop.Foundation PDP addressing method of the present invention and device are when two lines add same data, and the video picture degree (resolusion) that is produced and the loss of sharpness (sharpness) can be adjusted by the mean value of two pictures.Be a low-light level weighted value embodiment as shown in Figure 10 according to PDP addressing method of the present invention and device.Be ' 1 ' the 1st son (SF1) from luminance weighted value to luminance weighted value be that ' 8 ' the 4th son (SF4) carries out addressing by the two scannings of above-mentioned line, so display quality is lowly minimized.
On the other hand, reduce the address period time for further, can provide average data to plural line (for example 3 lines) simultaneously according to PDP addressing method of the present invention and device.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (11)
1. plasma display addressing method is to carry out addressing method in the method for driving plasma display device that the time-division drives an image time being divided into a plurality of sons field, it is characterized in that described plasma display addressing method comprises the steps:
In described each son field, be set in the son field of low weighted value, provide same data to plural line at least, thereby find the step of cell cube.
2. plasma display addressing method as claimed in claim 1 is characterized in that also comprising the steps:
Calculate the step of two picture data mean values.
3. plasma display addressing method as claimed in claim 2 is characterized in that also comprising the steps:
The step that described mean value is selected as described data.
4. plasma display addressing method as claimed in claim 1 is characterized in that:
The described son field that is set to low weighted value refers to weighted value and is set to son field ' 8 ' below.
5. plasma display addressing method is to carry out it is characterized in that described plasma display addressing method comprises following two steps in the method for driving plasma display device that the time-division drives an image time being divided into a plurality of sons field:
Calculate the step of two same data line mean values of picture and provide mean value to plural line at least, and the step of selected cell body.
6. plasma display device for addressing, be an image time to be divided into a plurality of sub device for addressing that carry out carrying out addressing in the method for driving plasma display device of time-division driving, it is characterized in that described plasma display device for addressing comprises with the lower part:
In described each son field, the son field that is set as low weighted value provides same data to plural line at least, and cell cube is carried out the addressing loop of addressing.
7. plasma display device for addressing as claimed in claim 6 is characterized in that also comprising:
Calculate the average data calculation element of two picture data mean values.
8. plasma display device for addressing as claimed in claim 7 is characterized in that:
Described addressing loop selects described mean value as described data.
9. plasma display device for addressing as claimed in claim 6 is characterized in that:
Describedly providing same data to plural line, is in weighted value is set to son below ' 8 '.
10. plasma display device for addressing as claimed in claim 6 is characterized in that also comprising:
Provide scan loop with the scanning impulse of described data sync simultaneously to described at least two lines.
11. a plasma display device for addressing is an image time to be divided into a plurality of sub device for addressing that carry out carrying out addressing in the method for driving plasma display device of time-division driving, it is characterized in that described plasma display device for addressing comprises:
Calculate the average data calculation element of two same data line mean values of picture;
At least provide mean value to plural line, and the addressing loop of selected cell body.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204852A (en) * | 1997-05-20 | 1999-01-13 | 三星电管株式会社 | Plasma display panel and driving method thereof |
| JPH1124627A (en) * | 1997-06-20 | 1999-01-29 | Daewoo Electron Co Ltd | Timing-control device and method for alternating-current plasma-display plate device |
| US6278243B1 (en) * | 1999-10-18 | 2001-08-21 | Samsung Sdi Co., Ltd. | Electrode division surface discharge plasma display apparatus |
| CN1343965A (en) * | 2000-09-21 | 2002-04-10 | 三星Sdi株式会社 | Method of driving plasma display panel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204852A (en) * | 1997-05-20 | 1999-01-13 | 三星电管株式会社 | Plasma display panel and driving method thereof |
| JPH1124627A (en) * | 1997-06-20 | 1999-01-29 | Daewoo Electron Co Ltd | Timing-control device and method for alternating-current plasma-display plate device |
| US6278243B1 (en) * | 1999-10-18 | 2001-08-21 | Samsung Sdi Co., Ltd. | Electrode division surface discharge plasma display apparatus |
| CN1343965A (en) * | 2000-09-21 | 2002-04-10 | 三星Sdi株式会社 | Method of driving plasma display panel |
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