CN1169105C - Control method for AC gas discharge display screen - Google Patents
Control method for AC gas discharge display screen Download PDFInfo
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- CN1169105C CN1169105C CNB021393052A CN02139305A CN1169105C CN 1169105 C CN1169105 C CN 1169105C CN B021393052 A CNB021393052 A CN B021393052A CN 02139305 A CN02139305 A CN 02139305A CN 1169105 C CN1169105 C CN 1169105C
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Abstract
The present invention discloses a control method for an AC gas discharge display screen. A total erase state is carried out before a preparation state and after the preparation state to create an optimum condition for reducing pulse numbers in the preparation state, the pulse numbers during the period of the preparation state are reduced, and the contrast of images is improved. When the operating state is displayed, a first pulse for holding discharge is added to a scan display electrode, and simultaneously, a supply pulse is added to a common display electrode to improve the control reliability of the display screen.
Description
Technical field
The invention belongs to the gas discharge technical field, be specifically related to a kind of control method of AC gas discharge display screen, can be used for containing the display system of AC gas discharge display screen (PDP), comprising the video module and the spliced display screen of color TV.
Background technology
According to the literature retrieval that the applicant carried out, the prior art data relevant or approaching with present patent application comprises following several pieces:
1. knownly a kind ofly have parallel, coplane and be grouped into control method the AC gas discharge display screen (PDP) of the scanning show electrode (selectable show electrode) arranged and public show electrode and the addressing electrode vertical with show electrode.This method comprises: in half selected addressing duty, add gating pulse when selecting addressing duty and display working condition entirely and pulse (European patent 0356313GO9G 3,/28 1989) is kept in discharge on electrode.When using this method, the reason that obstruction meets the requirements of technical result is wherein to lack the condition of improving image quality, this is because full when selecting the addressing duty, discharge is kept pulse and only is added in the repetition period on delegation's (or row) mapping unit, and this has just limited the quantity of the gray shade scale that constitutes.
2. that known a kind of control has is parallel, coplane and be grouped into to the scanning show electrode (show electrode of selection) arranged and public show electrode and with the control method that exchanges PDP of the vertical addressing electrode of show electrode.On electrode, add preparation pulse, erasing pulse, addressing pulse and discharge when this method is included in preliminary work state, addressing duty and display working condition and keep pulse, and erasing pulse is added in (T.Nakamure a.o. " Drive for40-in Diagonal Full-Color as Plasma Display " on the different show electrode groups in chronological order when the preliminary work state, SID95 DIGEST, pp.807-810).When this method of use, obstruction meets the requirements of the former of technical result because wherein lack the condition that improves control reliability, this is because in order to set up the preliminary work state, need to form the high preparation pulse of voltage amplitude on scanning show electrode and public show electrode.
3. the control method of known a kind of control AC gas discharge display screen (PDP) comprising: form preparation pulse at parallel, coplane and on being grouped into the scanning show electrode arranged and public show electrode when the preliminary work state, pulse and erasing pulse are subsequently kept in discharge; When the addressing duty, on the scanning show electrode, form scanning impulse, and on addressing electrode, form gating pulse, and when display working condition, on scanning show electrode and public show electrode, form discharge and keep pulse (European patent 0554172 H01J 17,/49 1993) perpendicular to scanning show electrode and public show electrode.
4. has same purposes with the present patent application, control method at the most approaching control AC gas discharge display screen (PDP) of general characteristic comprises: during at the preliminary work state, simultaneously the discharge that forms negative polarity on the public show electrode keep pulse and in parallel, coplane and the discharge that forms positive polarity on being grouped into the scanning show electrode of arranging keep pulse; When the addressing duty, form on the scanning show electrode scanning impulse and with the addressing electrode of scanning show electrode and public show electrode quadrature on form gating pulse and during at display working condition, on public show electrode and scanning show electrode, form discharge and keep pulse (Russ P 2106696 G09G 3/28 1998-prototype).When using this method of regarding as prototype, hindering the reason that meets the requirements of technical result is wherein to lack the condition of improving picture quality and improving control reliability.Because when the preliminary work state, the discharge that forms several full frame write pulses and erasing pulse and form at these impulse durations degenerates the contrast of image, and when erase status, use the erasing pulse that replenishes in the time of with positive pulse, can cause the raising of the controlling impulse voltage of information address period in address period.
Summary of the invention
Defective or deficiency according to above-mentioned prior art existence, the objective of the invention is to, the control method of a kind of AC gas discharge display screen (PDP) is provided, the task of the operating characteristic of improving the AC gas discharge display screen video module is solved, just when displayed image, the method for the umber of pulse during by minimizing preliminary work state improves the contrast of image and scans the reliability of the approach raising control of the controlling impulse voltage amplitude on show electrode and the addressing electrode by reduction.
To achieve these goals, the technical solution used in the present invention can reach by following technical measures: in the method for known pilot-gas discharge display screen (PDP), when being included in the preliminary work state, simultaneously the preparation pulse that forms negative polarity on the public show electrode with parallel, coplane with public show electrode and be grouped into the discharge that forms positive polarity on the scan electrode of arranging over the ground with it and keep pulse; In the addressing duty, form on the scan electrode scanning impulse and with the addressing electrode of scan electrode and public show electrode quadrature on form gating pulse; At display working condition, on public show electrode and scan electrode, form discharge and keep pulse.
The characteristics of control method of the present invention are: 1. carry out full frame wiping when display working condition finishes, for each height field, before the preliminary work state, carry out full frame the wiping first time of last brightness field; On public show electrode, form discharge in the erase process and keep pulse, be not less than in the discharge time limit of deionization time thereafter, forming no-voltage on all show electrodes and the addressing electrode to guarantee on public show electrode, to have the residual charge of negative polarity; And repeating once full frame wiping behind the preliminary work state to guarantee to have on the public show electrode residual charge of positive polarity.According to control method proposed by the invention, before the preliminary work state He behind the preliminary work state, carry out total erase status, the feasible top condition that can set up the umber of pulse when reducing the preliminary work state, and the amplitude of the interior potential pulse of reduction address period.2. for improving the reliability of AC gas discharge display screen (PDP) work, when display working condition, first pulse while of keeping discharge with forming on the scanning show electrode forms on public show electrode and replenishes pulse, and its amplitude Uadd selects by following formula:
Uadd＝Ufmax-Uqmin
In the formula: the maximum firing voltage of Ufmax-
The minimum extinction voltage of Uqmin-
Description of drawings
Fig. 1 a kind ofly has scanning show electrode and in parallel, coplane and is grouped into structural representation to the AC gas discharge display screen of the public show electrode arranged and the addressing electrode vertical with show electrode.
Fig. 2 be the present invention propose the display working condition that on the electrode of AC gas discharge display screen, forms the time have a potential pulse sequential chart of two brightness that difference holds time.
Embodiment
For a more clear understanding of the present invention, below in conjunction with the present invention is described in further detail with specific embodiment.
Shown in Figure 1 is the sketch map of AC gas discharge display screen, form by mapping unit 1, each mapping unit contains scanning show electrode 2 and in parallel, coplane also is grouped into public show electrode 3 to arranging, this electrode is placed on the top glass substrate 4, be coated with transparent dielectric layer 5 on it, and addressing electrode 6 is placed on the lower glass substrate 7, separating between the medium barrier 8, scribble the R that glows on the barrier, green glow G, or the fluorescent powder 9 of blue light B, addressing electrode is useful on the inlead 10 that is connected with the gating pulse power supply, scan electrode has the inlead 11 that is connected with the pulse voltage power supply, and for all mapping units, and public show electrode connects together and is connected to the inlead 12 of pulse voltage power supply.
X1 at AC gas discharge display screen, X2...Xm, Y1, Y2...Yn, on the S electrode, in each brightness field, form potential pulse illustrated in fig. 2, X1 here for preliminary work state, addressing duty and display working condition, the X2...Xm-addressing electrode, the public show electrode that Y1, Y2...Yn-scan electrode, S-interconnect.
On AC gas discharge display screen, show vision signal, may be just when the condition of the son field that every Frame image is divided into certain brightness, brightness of each son field when assert display working condition with the length of duration.For example, in order to obtain 64 gray levels, a Frame image is divided into 6 brightness fields, and each height field contains following state: preliminary work state, addressing duty and display working condition.The duration of preliminary work state and addressing duty is all identical to all brightness fields, and the duration of the display working condition of each son field is elected 1: 2: 4 as: 8: 16: 32 proportionate relationship.
Fig. 2 is that what to express is that proportionate relationship is the brightness son of two beginnings of 1: 2, for example, is 256cd/m in the brightness of PDP maximum
2The time and during 64 brightness levels, the brightness of first son will be: 256cd/m
2÷ 64=4cd/m
2, the brightness of second son field is 4cd/m
2* 2=8cd/m
2, the brightness of the 3rd son field is 4cd/m
2* 4=16cd/m
2, and the rest may be inferred to press above-mentioned relation.
In each height field, before the preliminary work state, carry out full frame the wiping first time behind last brightness.For this reason, on public show electrode, form discharge and keep pulse 13, and be no-voltage 14 on scan electrode.After discharge pulse 13 finished, remaining on the show electrode of all PDP and addressing electrode was no-voltage 14, and its duration is no less than the deionization time-Tdeion of discharge.
After discharge pulse 13 finished, when being no-voltage on the electrode of all PDP, the discharge in the mapping unit guaranteed the residual charge of accumulation negative polarity on public show electrode.These negative residual charges can be stablized the process of setting up discharge in all mapping units when minimum umber of pulse in during the preliminary work state, and the pulse height of reduction preliminary work state.
When the preliminary work state, owing on public show electrode, form preparation pulse 15, and on scan electrode, form the pulse 16 of supporting discharge, thereby in all mapping units, set up discharge.
After discharge pulse 15,16 finished, by the voltage 17 on all electrodes of regulating PDP, making its amplitude was zero, and the duration is for carrying out full frame wiping again the deionization time of discharge.Negative pulse 15 is set up the residual charge of positive polarity on public show electrode, and the residual charge of negative polarity is set up in pulse 16 on scan electrode, since the total voltage addition on the electrode, the voltage amplitude of the gating pulse when these electric charges can reduce addressing.All these make can use minimum umber of pulse when the preliminary work state, thereby reduces the brightness of background.
During the addressing duty,, in selected mapping unit, set up discharge owing on the scanning show electrode, form scanning impulse 18 successively in turn and on addressing electrode, form gating pulse 19 simultaneously with it.
When display working condition, when addressing in the selected mapping unit, owing to the discharge that forms on the scanning show electrode is kept pulse 21 and set up the periodic sequence of discharging.
For improving the reliability of AC gas discharge display screen work,,, on public show electrode, form the pulse that replenishes with first 21 whiles of pulse at display working condition.Voltage amplitude for the additional pulse 20 of the difference of maximum discharge firing voltage and minimum discharge extinction voltage and discharge keep pulse 21 together common guarantee discharge reliably in all selected mapping units catch fire.This is because the cause that voltage between show electrode Y and the S has improved after the addressing.Pulse 22 guarantees to produce in the mapping unit discharge when display working condition top condition is kept in the discharge that forms on public show electrode subsequently.
According to AC gas discharge display screen control method of the present invention, be 150 * 200 tlv triple at capacity, pitch is 1.05mm, blanketing gas is to verify on the PDP of He+1%Xe.
For allowing the video signal generating image, adopting in a Frame image in high-high brightness is 300cd/m
2The time, the sum frequency that pulse is kept in discharge is 6 brightness fields of 30kHz.
When the preliminary work state, the formation amplitude equals to discharge and keeps the full frame write pulse of pulse height 220V on the scanning show electrode, adds the pulse that amplitude is the negative polarity of 190V on public show electrode.In the addressing duty, the formation amplitude is the scanning impulse of 150V on the scanning show electrode, adds the pulse that amplitude is 40V-50V on addressing electrode.The width of scanning impulse and addressing pulse is 3 μ s.To keep pulse be 220V in discharge during demonstration, and width is 4 μ s, and frequency is 100kHz.The amplitude of replenishing pulse is 20V.
The brightness of bias light is from 5cd/m
2(prototype) is reduced to 2cd/m
2, promptly contrast was brought up to 150: 1 from 50: 1.The amplitude of scanning impulse is reduced to 150V from 170V, and the gating pulse on the addressing electrode is reduced to 40V-50V from 60V-70V.
Therefore, the method for control AC gas discharge display screen proposed by the invention can improve contrast and the control display screen and the video module whole reliability of image.
The control method of interchange gas panel of the present invention, according to the patent that the applicant carried out and the retrieval of scientific and technical information data, and the investigation that the similar product of the invention that contains Yu applied for is reported shows, no matter for gas panel, still for control method, the applicant does not have to find to have and the similar like product of technical characterictic of the present invention.The applicant has also carried out additional retrieval to known technical scheme, do not find when display video information, the voltage amplitude that improves the gating pulse on contrast and reduction scan electrode and the addressing electrode is to solve by following such scheme: in the method for control AC gas discharge display screen, finish to carry out total erase status behind the display working condition.When this state,,, on all show electrodes and addressing electrode, form no-voltage for guaranteeing to form on the public show electrode residual charge of negative polarity being not less than in the discharge time limit of deionization time.And behind the preliminary work state,, repeat once the full frame state of wiping for guaranteeing to form on the public show electrode residual charge of positive polarity.Do not find yet, the control reliability that improves display working condition solves by following scheme: when display working condition with the scanning show electrode on first pulse of keeping discharge of forming on public show electrode, form simultaneously and replenish pulse, its amplitude Uadd by formula: the Uadd=Ufmax-Uqmin selection.
In the formula: the maximum firing voltage of Ufmax-,
The minimum extinction voltage of Uqmin-
Claims (2)
1. the control method of an AC gas discharge display screen, comprise: when the preliminary work state, on public show electrode, form the priming pulse of negative polarity, simultaneously in parallel, coplane and the discharge that forms positive polarity on being grouped into the scanning show electrode of arranging keep pulse; When the addressing duty, forming scanning impulse on the scanning show electrode and on the addressing electrode orthogonal thereto, forming gating pulse with scanning show electrode and public show electrode; During display working condition, on public show electrode and scanning show electrode, form discharge and keep pulse; It is characterized in that, when display working condition finishes, carry out full frame wiping,, before the preliminary work state, carry out full frame the wiping first time of last brightness field for each height field; On public show electrode, form discharge in the erase process and keep pulse, during time of being not less than discharge deion all show electrode and addressing electrode on forming no-voltage to guarantee on public show electrode form negative residual charge thereafter, and behind the preliminary work state, repeat full frame wiping to guarantee on public show electrode, forming positive residual charge.
2. the control method of AC gas discharge display screen according to claim 1, it is characterized in that, during described display working condition, with first pulse while that pulse is kept in the discharge that forms on the scanning show electrode, the formation amplitude is pressed the additional pulse of the Uadd of following formula calculating on public show electrode: Uadd=Ufmax-Uqmin selects; In the formula: the maximum firing voltage of Ufmax-, the minimum extinction voltage of Uqmin-.
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| CNB021393052A CN1169105C (en) | 2002-07-25 | 2002-07-25 | Control method for AC gas discharge display screen |
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| CNB021393052A CN1169105C (en) | 2002-07-25 | 2002-07-25 | Control method for AC gas discharge display screen |
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| CN1392526A CN1392526A (en) | 2003-01-22 |
| CN1169105C true CN1169105C (en) | 2004-09-29 |
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| KR100627408B1 (en) * | 2004-11-05 | 2006-09-21 | 삼성에스디아이 주식회사 | Plasma display device and driving method thereof |
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