CN100373430C - Method for driving plasma display device - Google Patents
Method for driving plasma display device Download PDFInfo
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- CN100373430C CN100373430C CNB2004100542622A CN200410054262A CN100373430C CN 100373430 C CN100373430 C CN 100373430C CN B2004100542622 A CNB2004100542622 A CN B2004100542622A CN 200410054262 A CN200410054262 A CN 200410054262A CN 100373430 C CN100373430 C CN 100373430C
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Abstract
The present invention relates to a plasma display driving method, which drives a plasma display by a selected elimination mode. The present invention is characterized in that a frame is divided into a plurality of subfields with a plurality of different gray weighting values, and the subfields are divided into a resetting period, an addressing period and a maintaining period. The present invention comprises that in the maintaining period, the cycles of the maintaining pulses provided by a plasma display can be changed according to different subfields. The present invention has the advantages that the cycles of the maintaining pulses are different because of different subfields in a frame, and the gray scale and the picture quality can be increased by increasing the number of the maintaining pulses.
Description
(1) technical field
The invention relates to plasma display, especially, can improve a kind of method for driving plasma display device of gray scale about by selecting cancellation to drive plasma display.
(2) background technology
Plasma display (Plasma Display Panel: be designated hereinafter simply as " PDP ") is according to He+Xe, the ultraviolet ray of the 147nm that produces during the discharge of inert mixed gas such as Ne+Xe and He+Ne+Xe, excited fluophor is luminous, can demonstrate the picture and the dynamic image that comprise writings and image etc.Plasma display is not only realized miniaturization gradually, filming, and, recently, continually developing research to seek more outstanding image quality.Especially, what deserves to be mentioned is, during 3 electrode AC creeping discharge type PDP discharge, utilize insulator layer accumulation wall electric charge, reduce the needed voltage of discharge, guard electrode is avoided the influence of plasma sputtering, and it has, and driving voltage hangs down and the advantage of long service life.
With reference to Fig. 1, Fig. 1 is the oblique view of the discharge cell structure of existing 3 electrode AC creeping discharge type plasma displays, as can be seen, the discharge cell of 3 electrode AC creeping discharge type PDP is by at the scan electrode that forms on the upper substrate 10 (Y) and keep electrode (Z) and the address electrode (X) that forms constitutes on lower basal plate 18.Scan electrode (Y) and keep electrode (Z) comprise respectively transparency electrode (12Y, 12Z); Than transparency electrode (12Y 12Z) has littler wire spoke, metal bus (bus) electrode that on transparency electrode one lateral edges, forms (13Y, 13Z).(12Y 12Z) is generally upward formed in upper substrate (10) by indium tin oxide (Indium-Tin-Oxide: hereinafter to be referred as " ITO ") transparency electrode.(13Y 13Z) generally adopts chromium metal materials such as (Cr) to metal bus (bus) electrode, and (12Y 12Z) goes up formation, has effective minimizing transparency electrode (12Y, 12Z) effect of the strong load of the voltage of Chan Shenging in transparency electrode.Forming scan electrode (Y) and keeping on the upper substrate 10 of electrode (Z), have top insulator layer 14 and diaphragm 16.In top insulator layer 14, the wall electric charge that produces during the accumulation plasma discharge.The charge particle sputter that diaphragm 16 produces when preventing gas discharge influences the damage of top insulator layer 14, can improve the emission efficiency of 2 electronics simultaneously.Diaphragm 16 adopts magnesium oxide (MgO) material usually.On the lower basal plate 18 of calculated address electrode (X), have lower isolator layer 22 and partition wall 24.On the surface of lower isolator layer 22 and partition wall 24, form luminescent coating 26.Address electrode (X) is towards scan electrode (Y) and keep the direction formation that electrode (Z) intersects.Partition wall 24 forms side by side with address electrode (X), and 1 ultraviolet ray and the visible light that generates that prevent to discharge piled up in contiguous discharge cell.The ultraviolet ray that luminescent coating 26 produces during according to plasma discharge, stimulated luminescence produces any one visible light in the red green and blueness.In the discharge space between last/lower basal plate (10,18) and the partition wall 24, the He+Xe that injection can be discharged, inert mixed gas such as Ne+Xe and He+Ne+Xe.
PDP is divided into the different a plurality of subdomains of number in order to realize the grey level of picture luminous time with a frame, adopts the mode (Address andDisplay Seperated:ADS) of address and display separation to drive.Each subdomain is divided into the reseting period of homogeneous discharge once more; Select during the address of discharge cell; According to the number that discharges back, realize during the keeping of gray scale.Reseting period can be divided into during the front illumination that the up-wards inclination pulse is provided and provide during a plurality of stabilizations of stabilization pulse.Such as when utilizing 256 gray scale display frames, as shown in Figure 2, Fig. 2 realizes 256 gray scales, and the frame of 8 bytes acquiescence sign indicating number constitutes synoptic diagram, in 1/60 second, will be divided into 8 subdomains (SF1 is to SF8) relevant image duration (16.67ms).8 subdomains (SF1 is to SF8) are divided into during the reseting period address and during keeping as top the argumentation.At the same demifacet of each subdomain, keep number of pulses in each subdomain with relevant during keeping during the reseting period of each subdomain and the address, according to the ratio increase of 2n (n=0,1,2,3,4,5,6,7).
On the other hand, whether this PDP driving method is whether luminous according to the discharge cell of selecting the address discharge during the address, is divided into selectivity and writes (Selectivewriting) mode and selectivity elimination (Selective erasing) mode.Selectivity ways of writing driving method is at reseting period, and behind preceding image close (Turn-Off), the discharge cell that will select during the address is opened (Turn-on).Then, during keeping, keep discharge, display frame by the discharge cell that the address discharge is selected.The driving method of selectivity cancellation is at reseting period, to the discharge of throwing light on of preceding picture, open (Turn-on) after, the discharge cell of selecting during the address is opened (Turn-on).Then, during keeping, the address unselected discharge cell that discharges is kept discharge, display frame.
Fig. 3 is the oscillogram that drives the method for driving plasma display device of plasma display according to existing selection cancellation.
As shown in Figure 3, drive PDP according to existing selection cancellation, be included in first subdomain (SF1) in the frame be divided into during reseting period (RPD), the address (APD) and keep during (SPD) drive.
At reseting period (RPD),, open (turn-on) discharge cell in order to carry out reset discharge in the preceding discharge cell in PDP.During the address (APD), optionally close the discharge cell that (turn-off) opens at reseting period (RPD).During keeping (SPD), (APD) unselected discharge cell is kept discharge during the address.
Reseting period (RPD) can be divided into to scan electrode (Y) and keep electrode (Z) and provide the front illumination of inclination pulse during (RPD1) and the stabilization of stabilization pulse is provided during (RPD2).
In front during the illumination in (RPD1), provide the inclination pulse (RPy) of positive polarity (+), provide the inclination pulse (RPz) of negative polarity (-) to keeping electrode (Z) to scan electrode (Y).And, during the illumination (RPD1), provide earth potential (GND) in front to address electrode (X).Here, the inclination pulse (RPy) of positive polarity (+) is set for and kept the identical voltage of voltage (Vs).And, the inclination pulse (RPz) of negative polarity (-) is set for than keeping voltage that voltage (Vs) has a bigger absolute value (promptly, | Vs|＜|-Vz|), in front during the illumination (RPD1), provide the inclination pulse 52Py of positive polarity (+) to scan electrode (Y)), to keeping electrode (Z) and provide the inclination pulse (RPz) of negative polarity (-), according to scan electrode (Y) with keep voltage difference between the electrode (Z), all discharge cells carry out reset discharge.Therefore, provide the wall electric charge of scan electrode (Y) the formation negative polarity (-) of positive polarity (+) inclination pulse (RPy), the wall electric charge that electrode (Z) forms positive polarity (+) of keeping of negative polarity (-) inclination pulse (RPz) is provided.
During stabilization (RPD2), provide the 2nd stabilization pulse (Rz) to keeping electrode (Z), provide the 1st stabilization pulse (Ry) to scan electrode (Y), hocket.At this moment, the magnitude of voltage of the 1st stabilization pulse (Ry) and the 2nd stabilization pulse (Rz) is set at to keep voltage (Vs) the same.Therefore, according to scan electrode (Y) and keep between the electrode (Z) to keep voltage (Vs) poor, at scan electrode (Y) with keep the wall electric charge that forms homogeneous in all discharge cells that produce the stabilization discharge between the electrode (Z).(that is, discharge cell is opened (turn-on)).
During the address (APD), (scanning impulse Vy) (SP) provides data pulse (DP) with scanning impulse (SP) coordination to address electrode (X) to provide the scanning voltage that drops to negative polarity (-) to scan electrode (Y).At this moment, carry out the address discharge in the discharge cell that data pulse (DP) is provided, that is, eliminate discharge, discharge cell is closed (turnoff).
During keeping (SPD), to scan electrode (Y) and keep electrode (Z) provide in turn keep pulse (SUSPy, SUSPz).At this moment, (SUSPy, cycle SUSPz), (Ts) was certain in the pulse of keeping that provides in turn.If to scan electrode (Y) with keep electrode (Z) and provide and keep pulse (SUSPy SUSPz), during the address in (APD) unselected discharge cell, produces and keeps discharge.At this moment, the number that discharges back, representing gradation weight corresponding gray are kept in adjustment.
On the other hand, the residue subdomain except first subdomain does not comprise reseting period (RPD).In other words, the residue subdomain move during the address (APD) repeatedly and keep during (SPD), according to the gray-scale value representing gradation.Specifically, in first subdomain (SF1), cancellation drives PDP in order to pass through optionally, and all discharge cells of reseting period (RPD) are opened (turn-on).Then, in the remaining subdomain except first subdomain, optionally close (turn-off) and open the discharge cell of (turn-on), representing gradation value at the reseting period (RPD) of first subdomain.
This PDP requires high-resolution in order to realize high-quality image quality, high gray scale, high light (Highcontrast ratio), low profile noise (Contour noise) etc.And, in PDP, in order to realize high-quality image quality, during the address that the ADS type of drive should be guaranteed to be fit to (APD).Because PDP high-resolution/high resolving power develops more, the quantity of sweep trace increases more, and (APD) is long more during the address, during difficult more the keeping of guaranteeing to be fit to (SPD).For example, there are 480 sweep traces, each needs the sweep time of 3 μ s, if adopt (single scan) mode of lining by line scan scan in order from first sweep trace to a last sweep trace that a frame is divided into 8 subdomains when driving, in a frame, (APD) is more than 480 * 3 μ s * 8=13ms during the address that needs.Therefore, in a frame, (SPD) is definitely not enough for 16.67ms-13ms during keeping.
Owing to can not guarantee (SPD) during sufficient the keeping, be difficult to representing gradation.Promptly, drive plasma display dirving method according to existing Technology Selection cancellation, because to scan electrode (Y) and keep that electrode (Z) provides in turn keep pulse (SUSP, SUSPz) cycle is fixed, and increases the number of subdomain and increase the number of keeping pulse to be subjected to certain limitation.Therefore, owing to can not increase certain above number of keeping pulse, there is the low problem of gray scale.
(3) summary of the invention
To the objective of the invention is in order addressing the above problem, to provide a kind of and drive plasma display, can improve the plasma display dirving method of gray scale by the cancellation of selecting.
To achieve these goals, method for driving plasma display device of the present invention is that a frame is divided into the different a plurality of subdomains of a plurality of gray scale weights, first subdomain is divided into during reseting period, the address and during keeping, the residue subdomain is divided into during the address and during keeping, drive plasma display by the cancellation of selecting, feature of the present invention is during keeping, and the cycle of keeping pulse that plasma display provides can change according to the difference of subdomain kind; During described keeping, it is the 1st long recurrence interval of relative cycle to the pulse of keeping that has the subdomain that is lower than the standard grayscale weight and provide.
Above-mentioned the 1st recurrence interval is set at below the 5 μ s.
Above-mentioned the 1st recurrence interval keep the keeping of 1st to 3rd subdomain of pulse in tactic a plurality of subdomains according to the gray scale weight during provide.
Above-mentioned the 1st recurrence interval keep the keeping of 1st to 2nd subdomain of pulse in tactic a plurality of subdomains according to the gray scale weight during provide.
During above-mentioned keeping, it is 2nd recurrence interval shorter than the 1st recurrence interval to the pulse of keeping that has the subdomain that is higher than the standard grayscale weight and provide.
Above-mentioned the 2nd recurrence interval is set at below the 4 μ s.
Above-mentioned the 2nd recurrence interval keep the keeping of subdomain more than the 4th subdomain of pulse in tactic a plurality of subdomains according to the gray scale weight during provide.
Above-mentioned the 2nd recurrence interval keep the keeping of subdomain more than the 3rd subdomain of pulse in tactic a plurality of subdomains according to the gray scale weight during provide.
Effect of the present invention:
A kind of method for driving plasma display device that drives plasma display by the selectivity cancellation provided by the invention, because in a frame, difference according to each subdomain, the cycle of keeping pulse is also different not to the utmost, keep the number of pulse by increase, can increase gray scale and improve the animation image quality.And, when the present invention being applied in the type of drive of lining by line scan,, during can guaranteeing to keep fully, reach the effect that realizes that high image quality drives owing to can increase the number of keeping pulse.
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 is the oblique view of the discharge cell structure of existing 3 electrode AC creeping discharge type plasma displays.
Fig. 2 realizes 256 gray scales, and the frame of 8 bytes acquiescence sign indicating number constitutes synoptic diagram.
Fig. 3 is the oscillogram that drives the method for driving plasma display device of plasma display by the selection cancellation of Fig. 1.
Fig. 4 is that the present invention drives the oscillogram of the method for driving plasma display device embodiment of plasma display by selecting cancellation.
Fig. 5 is the synoptic diagram of keeping pulse that provides to the low subdomain of the gray scale weight of Fig. 4.
Fig. 6 is the synoptic diagram of keeping pulse that provides to the high subdomain of the gray scale weight of Fig. 4.
The symbol description of major part in the accompanying drawing:
10: upper substrate 18: lower basal plate
Y: scan electrode Z: keep electrode
X: address electrode 12Y, 12Z: transparency electrode
13Y, 13Z: metal bus electrode 14: top insulator layer
16: diaphragm 22: the lower isolator layer
24: partition wall 26: luminescent coating
(5) embodiment
Below with reference to Fig. 4 to 6, the embodiment of ion display drive method of the present invention is elaborated.
Fig. 4 is that the present invention drives the oscillogram of the method for driving plasma display device embodiment of plasma display by selecting cancellation.
With reference to Fig. 4, we as can be seen, the embodiment of the invention will be included in first subdomain (SF1) in the frame of PDP be divided into during reseting period (RPD), the address (APD) and keep during (SPD) drive.
At reseting period (RPD),, open (turn-on) discharge cell in order to carry out reset discharge in the preceding discharge cell in PDP.During the address (APD), optionally close (turn-off) reseting period (discharge cell that RPD opens.During keeping (SPD), (APD) unselected discharge cell is kept discharge during the address.
Reseting period (RPD) can be divided into to scan electrode (Y) and keep electrode (Z) and provide the front illumination of inclination pulse during (RPD1) and the stabilization of stabilization pulse is provided during (RPD2).
In (RPD1), provide the inclination pulse (RPy) of positive polarity (+) to provide the inclination pulse (RPz) of negative polarity (-) to scan electrode (Y) during throwing light in front to keeping electrode (Z).And, during the illumination (RPD1), provide earth potential (GND) in front to address electrode (X).Here, the inclination pulse (RPy) of positive polarity (+) is set for and kept the identical voltage of voltage (Vs).And, the inclination pulse (RPz) of negative polarity (-) is set for than keeping voltage that voltage (Vs) has a bigger absolute value (promptly, | Vs|＜|-Vz|), in front during the illumination (RPD1), the inclination pulse 52Py of positive polarity (+) is provided to scan electrode (Y), to keeping electrode (Z) and provide the inclination pulse (RPz) of negative polarity (-), according to scan electrode (Y) with keep voltage difference between the electrode (Z), all discharge cells carry out reset discharge.Therefore, provide the wall electric charge of scan electrode (Y) the formation negative polarity (-) of positive polarity (+) inclination pulse (RPy), the wall electric charge that electrode (Z) forms positive polarity (+) of keeping of negative polarity (-) inclination pulse (RPz) is provided.
During stabilization (RPD2), the 2nd stabilization pulse is provided (Rz3), (Ry1, Ry2 Ry3), hocket to provide the 1st stabilization pulse to scan electrode (Y) for Rz1, Rz2 to keeping electrode (Z).At this moment, with the 1st stabilization pulse (Ry1, Ry2, Ry3) and the 2nd stabilization pulse (Rz1, Rz2, magnitude of voltage Rz3) set for to keep voltage (Vs) identical.Therefore, according to scan electrode (Y) and keep between the electrode (Z) to keep voltage (Vs) poor, scan electrode (Y) and keep and produce the stabilization discharge between the electrode (Z) in all discharge cells, forms the wall electric charge of homogeneous.That is, discharge cell is opened (turn-on).
During the address (APD), (scanning impulse Vy) (SP) provides data pulse (DP) with scanning impulse (SP) coordination to address electrode (X) to provide the scanning voltage that drops to negative polarity (-) to scan electrode (Y).At this moment, carry out the address discharge in the discharge cell that data pulse (DP) is provided, that is, eliminate discharge, discharge cell is closed (turnoff).
During keeping (SPD), to scan electrode (Y) and keep electrode (Z) provide in turn keep pulse (SUSPy, SUSPz).At this moment, (SUSPy, cycle SUSPz), is set to according to subdomain kind difference in a frame according to the control of the time-controllable input signal of not indicating among the figure, has variable-size in the pulse of keeping that provides in turn.That is, during PDP drives, have the subdomain that is lower than the standard grayscale weight, during keeping (SPD), as shown in Figure 5, scan electrode (Y) and keep electrode (Z) and approve the pulse of keeping with long the 1st recurrence interval (Tsa) in cycle.Such as, in having the subdomain that is lower than the standard grayscale weight, the cycle (Tsa) of keeping pulse is set at below the 5 μ s.At this moment, what have the 1st recurrence interval (Tsa) keeps pulse by providing according to the 3rd subdomain (SF3) in the tactic a plurality of subdomains of the increase of gray scale weight, preferably provides by during the keeping of the following subdomain of the 2nd subdomain (SF2).Therefore, in having the subdomain that is lower than the standard grayscale weight, the wall electric charge that the formation that can select moves freely provides the pulse of keeping, owing to can strengthen the low side's of gray scale weight gray scale expressive force with long relatively the 1st recurrence interval (Tsa) in cycle.
On the other hand, in subdomain with the gray scale weight that is higher than standard value, during keeping (SPD), as shown in Figure 6, scan electrode (Y) and keep the pulse of keeping that electrode (Z) approval has 2nd recurrence interval (Tsb) shorter than the 1st recurrence interval (Tsa).Such as, in the high subdomain of gray scale weight, the cycle (Tsb) of keeping pulse is set at below the 4 μ s.At this moment, what have the 2nd recurrence interval (Tsb) keeps pulse by increasing according to the gray scale weight in tactic a plurality of subdomain, more than the 4th subdomain (SF4), preferably provides during the keeping of the above subdomain of the 3rd subdomain (SF3).Therefore, in the subdomain with the gray scale weight that is higher than standard value, provide the pulse of keeping that much has short the 2nd recurrence interval (Tsb) in cycle owing to can and keep electrode (Z) to scan electrode (Y), the gray scale performance strengthens, and can improve gray scale.
In other words, in a frame, owing to the difference according to each subdomain, the cycle of keeping pulse is not quite similar, and does not need to reduce the gray scale expressive ability, can increase frame subdomain number.Keep the number of pulse by increase, can reach the effect that improves gray scale and improve image quality.And, when the present invention being applied in the type of drive of lining by line scan,, during can guaranteeing to keep fully, reach the effect that realizes that high image quality drives owing to can increase the number of keeping pulse.
On the other hand, the residue subdomain except first subdomain does not comprise reseting period (RPD).In other words, the residue subdomain move during the address (APD) repeatedly and keep during (SPD), according to the gray-scale value representing gradation.Specifically, in first subdomain (SF1),, all discharge cells of reseting period (RPD) are opened (turn-on) in order to drive PDP by the cancellation of selecting.Then, in the residue subdomain except first subdomain, optionally close (turn-off) and open the discharge cell of (turn-on), representing gradation value at the reseting period (RPD) of first subdomain.
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 (8)
1. plasma display dirving method, be that a frame is divided into the different a plurality of subdomains of a plurality of gray scale weights, first subdomain is divided into during reseting period, the address and during keeping, the residue subdomain is divided into during the address and during keeping, drive the method for driving plasma display device of plasma display by the cancellation of selecting, it is characterized in that comprising:
The cycle of keeping pulse that plasma display provides during described keeping can change according to the difference of subdomain kind;
During described keeping, it is the 1st long recurrence interval of relative cycle to the pulse of keeping that has the subdomain that is lower than the standard grayscale weight and provide.
2. plasma display dirving method as claimed in claim 1 is characterized in that:
Described the 1st recurrence interval is set at below the 5 μ s.
3. method for driving plasma display device as claimed in claim 1 is characterized in that:
Described the 1st recurrence interval keep the keeping of 1st to 3rd subdomain of pulse in tactic a plurality of territories according to the gray scale weight during provide.
4. method for driving plasma display device as claimed in claim 1 is characterized in that:
Described the 1st recurrence interval keep the keeping of 1st to 2nd subdomain of pulse in tactic a plurality of territories according to the gray scale weight during provide.
5. method for driving plasma display device as claimed in claim 1 is characterized in that:
During described keeping, the pulse of keeping that provides to the subdomain with the gray scale weight that is higher than standard value has 2nd recurrence interval shorter than the 1st recurrence interval.
6. method for driving plasma display device as claimed in claim 5 is characterized in that:
Described the 2nd recurrence interval is set at below the 4 μ s.
7. method for driving plasma display device as claimed in claim 5 is characterized in that:
Described the 2nd recurrence interval keep the keeping of subdomain more than the 4th subdomain of pulse in tactic a plurality of territories according to the gray scale weight during provide.
8. method for driving plasma display device as claimed in claim 5 is characterized in that:
Described the 2nd recurrence interval keep the keeping of the 3rd subdomain above subdomain of pulse in tactic a plurality of territories according to the gray scale weight during provide.
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| KR20070118915A (en) * | 2006-06-13 | 2007-12-18 | 엘지전자 주식회사 | Driving method for plasma display panel |
| KR20080006824A (en) * | 2006-07-13 | 2008-01-17 | 엘지전자 주식회사 | Plasma display apparatus |
| CN101753908B (en) * | 2008-12-02 | 2011-07-20 | 青岛海信电器股份有限公司 | Cartoon display method applicable to PDP and PDP television |
| CN102568371A (en) * | 2012-01-19 | 2012-07-11 | 安徽鑫昊等离子显示器件有限公司 | Method for driving plasma display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6175194B1 (en) * | 1999-02-19 | 2001-01-16 | Pioneer Corporation | Method for driving a plasma display panel |
| CN1284698A (en) * | 2000-07-28 | 2001-02-21 | 东南大学 | Mixed AC/DC driving method for plasma display panel |
| EP1345199A2 (en) * | 2002-03-12 | 2003-09-17 | Fujitsu Hitachi Plasma Display Limited | Plasma display apparatus |
| CN1517961A (en) * | 2003-01-10 | 2004-08-04 | ��ķɭ���ó��˾ | Method and equipment for optimizing brightness of display equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6175194B1 (en) * | 1999-02-19 | 2001-01-16 | Pioneer Corporation | Method for driving a plasma display panel |
| CN1284698A (en) * | 2000-07-28 | 2001-02-21 | 东南大学 | Mixed AC/DC driving method for plasma display panel |
| EP1345199A2 (en) * | 2002-03-12 | 2003-09-17 | Fujitsu Hitachi Plasma Display Limited | Plasma display apparatus |
| CN1517961A (en) * | 2003-01-10 | 2004-08-04 | ��ķɭ���ó��˾ | Method and equipment for optimizing brightness of display equipment |
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