CN100375138C - Plasma display driving device and driving method - Google Patents
Plasma display driving device and driving method Download PDFInfo
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- CN100375138C CN100375138C CNB2004100673690A CN200410067369A CN100375138C CN 100375138 C CN100375138 C CN 100375138C CN B2004100673690 A CNB2004100673690 A CN B2004100673690A CN 200410067369 A CN200410067369 A CN 200410067369A CN 100375138 C CN100375138 C CN 100375138C
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- rising waveform
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Abstract
The present invention relates to a plasma display driving device and the driving method thereof. The start-up period of the plasma display driving method of the present invention comprises two steps: the first step is to provide a first rising waveform increased through exponential function; the second step is to provide a second rising waveform with a certain inclination after the first rising waveform is provided. The present invention is characterized in that in the first rising period, a scanning electrode is provided with the first waveform of a voltage raised higher than a maintaining voltage through increasing the exponential function, and thus, the starting time can be reduced.
Description
(1) technical field
The invention relates to the technology of the drive unit of plasma display, especially about the invention of the drive unit of a kind of plasma display that can shorten the starting period.
(2) background technology
Its principle of work of plasma display (Plasma Display Panel: be designated hereinafter simply as " PDP ") is by He+Xe, Ne+Xe, or the ultraviolet ray that takes place during noble gas discharge such as He+Xe+Ne impels light-emitting phosphor, and then show.This PDP not only can manufacture giant-screen and ultrathin type, and along with its picture quality of exploitation of nearest technology has also significantly raising.
With reference to shown in Figure 1, it is equipped with the discharge cell body of 3 electrodes interchange surface discharge type PDP: at scan electrode 30Y that forms on the preceding glass plate 10 and the addressing electrode 20X that keeps electrode 30Z and form on the glass plate of back.
Scan electrode 30Y and keep electrode 30Z and comprise transparency electrode 12Y, 12Z respectively, littler and metal bus electrode 13Y, 13Z that form in a side of transparency electrode than the wire spoke of transparency electrode 12Y, 12Z.Transparency electrode 12Y, 12Z are formed in preceding glass plate 10 by indium tin oxide (Indium-Tin-Oxide) usually.Metal bus (bus) electrode is formed on transparency electrode by metals such as chromium usually, reduces the voltage that causes owing to the high transparency electrode of impedance and descends.
Scan electrode 30Y and keep superposeed in the preceding glass plate 10 that electrode 30Z forms side by side upper dielectric layer 14 and protective seam 16.The wall electric charge that produces when in upper dielectric layer 14, having plasma discharge.Because of sputter upper dielectric layer 14 is caused damage when protective seam 16 prevents plasma discharge, simultaneously, improve the efficient that 2 electric charges are emitted.Protective seam 16 is normally formed by magnesium.
Be formed with lower dielectric layer 22 and spaced walls 24 in the back glass plate 18 that addressing electrode 20X forms.Surface in lower dielectric layer 22 and spaced walls 24 scribbles luminescent coating 26.Addressing electrode 20X is by scan electrode 30Y and keep the direction formation that electrode 30Z intersects.Spaced walls 24 forms side by side with addressing electrode 20X, prevents because ultraviolet ray that discharge generates and visible light are leaked to the discharge cell body that closes on.The ultraviolet ray that fluorophor 26 is taken place during according to plasma discharge produces any visible rays in red, green, the blueness.The discharge space inert gas injecting that between forward and backward glass plate 10,18 and spaced walls, has.
PDP is decomposed into the different son field of a plurality of number of light emission times with a frame, and carries out the time-division and cut driving for realizing the gray scale of image.Each son field can be divided into the full frame starting period of startup; Select trace wiring, and in selecting trace wiring the address period of selected cell body; Form keeping the phase of gray scale according to discharge time.Here, the starting period can be divided into setting (set up) time of supplying with the up-wards inclination waveform and download (set down) time that the decline tilt waveform is provided again.
For example, same as shown in Figure 2 in the time of representing 256 gray level images, the frame time that is equivalent to sixtieth second is divided into 8 sons (SF1 to SF8).8 sons (SF1 to SF8) are same as described above respectively, are divided into starting period, address period and keep the phase.Starting period and address period its each of each son is all identical, the phase of keeping on the contrary in each son by 2
nThe ratio of (n=0,1,2,3,4,5,6,7) increases.
Fig. 3 is the PDP drive waveforms figure that provides to two son fields.
For Fig. 3, what Y showed is scan electrode, and what Z showed is to keep electrode, and what X showed then is addressing electrode.
If with reference to Fig. 3, PDP can be divided into: start the full frame needed starting period; The address period of selected cell body is kept keeping the phase of selected cell cube discharge.
For the starting period, (setup) is set in the time, the up-wards inclination waveform is approved by all scan electrodes simultaneously.According to this up-wards inclination waveform, in full frame cell cube, cause faint discharge, in cell cube, generate the wall electric charge.Here, the up-wards inclination waveform from keeping voltage, is certain degree of tilt and rises with the voltage of keeping voltage Vs sum to (setup) voltage is set after keeping the rising of voltage straight line.
It is interim to download (set down), the up-wards inclination waveform is provided after, the waveform that has a down dip that descends from compare lower cathode voltage with the peak voltage of up-wards inclination voltage is scanned electrode simultaneously and approves.The waveform that has a down dip is by erasure discharge faint in cell cube, to being wiped by unnecessary electric charge in wall electric charge that the generation of (setup) voltage is set and the space charge, necessary electric charge in full frame cell cube that address discharge is required is arranged equably.
In address period the negative pole scanning voltage have sequentially be scanned electrode approval in, the anodal data pulse electrode that also is addressed is approved.In the time of the voltage difference of scanning impulse and data pulse and the wall electric charge addition that generates in the starting period, address discharge takes place in the cell cube that data pulse is approved.According to generating the wall electric charge in the cell cube of address discharge selection.
On the other hand, in (set down) phase of download and address period, provide the anodal DC voltage of keeping electric pressure to keeping electrode.
Keep interim, scan electrode Y and keep electrode and alternately approve and keep pulse.If like this, the cell cube of selecting according to address discharge in cell cube wall voltage with keep impulse summation in, cause the discharge discharge of keeping of form of face at scan electrode between the electrode with keeping when each keeps the pulse approval.At last, after keeping discharge and finishing, the tilt waveform of wiping that pulse is less provides to keeping electrode, the wall electric charge in the erase unit body.
In this driving method, keep the time of phase as display image, should guarantee fully to hold time for suitable briliancy occurring.Along with the development of PDP to high definition and giant-screen, the scan electrode of PDP also increases with the quantity of keeping electrode thereupon.Thus, should shorten, in the PDP of high definition, guarantee to hold time fully except address period during keeping or starting period.Here, because the cell cube that requires of abbreviated addressing time and can not selecting should be distributed the time to a certain degree in address period.
Thus, should shorten the starting period of start unit body, in the PDP of high definition, guarantee to hold time fully.Here, the trigger voltage that the up-wards inclination waveform of (set up) phase will be set rises to be kept more than the voltage, can shorten start-up time like this.In other words, surpass the voltage of keeping voltage, can shorten the time of startup by up-wards inclination waveform straight line is risen to.Meanwhile,, generate many wall electric charges in the discharge cell body, can stably start the discharge cell body thus if the up-wards inclination waveform rises to high-tension words at short notice.If but the up-wards inclination waveform rises to point-blank above the voltage of keeping voltage, strong discharge takes place in the discharge cell body, whole contrast is descended.
(3) summary of the invention
The objective of the invention is provides a kind of drive unit of plasma display in order to address the above problem, and makes under the situation that contrast does not have to descend, and shortens start-up time.
For achieving the above object,
The drive unit of plasma display of the present invention is equipped with:
The panel capacitance that forms of equal value in the discharge cell body;
Be provided in the described panel capacitance and increase the rising waveform generator of rising waveform and the rising waveform generator that is equipped with panel capacitance cathetus rising waveform by exponential function;
The rising waveform generator that described exponential function increases rising waveform comprises: the 2nd resistance (R2) of connecting with described panel capacitance; Be connected in plasma display drive unit the 4th switch (S4) between voltage source and described the 2nd resistance (R2) is set;
The rising waveform generator of described straight line rising waveform comprises: be connected in plasma display drive unit the 1st electric capacity (C1) between voltage source and the energy recovery circuit is set; 1st switch (S1) in parallel with described the 1st electric capacity (C1); Limit the variable resistor (R1) of described the 1st switch (S1) the channel width of cloth.
Above said the 4th switch (S4) when connecting, rely on the 2nd resistance (R2) and the panel capacitance of series connection, will provide to panel capacitance by the rising pulse that exponential function increases degree of tilt.
Straight line rising waveform generator is equipped with in addition, the rising waveform that increases by exponential function is provided after, the rising waveform that provides straight line to increase to panel capacitance.
Effect of the present invention:
The drive unit of plasma display of the present invention in the 1st rising stage, when increasing by exponential function, rises to keeping voltage and compares the 1st rising waveform of higher voltage and provide to scan electrode, can reduce the time of startup like this.Meanwhile, provide the 1st rising waveform that rises to high voltage at short notice, can make the more stable startup of discharge cell body.
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 formation synoptic diagram that existing 3 electrodes exchange surface discharge plasma display discharge cell body.
Fig. 2 is the synoptic diagram of a frame of plasma display;
Fig. 3 is the oscillogram that shows existing method for driving plasma display device;
Fig. 4 is the oscillogram that shows according to the method for driving plasma display device of the embodiment of the invention;
Fig. 5 is the loop diagram according to the plasma display device driver of the embodiment of the invention
Fig. 6 is a switch timing diagram shown in Figure 5.
The symbol description of major part in the accompanying drawing:
10: preceding glass plate 12Y, 12Z: transparency electrode
13Y, 13Z: bus (bus) electrode 14.22: dielectric layer
16: protective seam 18: back glass plate
20X: addressing electrode 24: spaced walls
26: luminescent coating 30Y: scan electrode
30Z: keep electrode 40: energy recovery circuit
42.44: the rising waveform generator
(5) embodiment
Following with reference to Fig. 4 to Fig. 6, the embodiment of the drive unit of plasma display of the present invention is elaborated.
Fig. 4 refers to according to the embodiment of the invention, the oscillogram of method for driving plasma display device.
For Fig. 4, Y is a scan electrode, and Z keeps electrode, and X refers to addressing electrode.
As reference Fig. 4, PDP can be divided into and driving following three periods: start the full frame starting period; The address period of selected cell body; With keep keeping the phase of selected cell body discharge.
Starting period can be divided into again and driving following two periods: setting (setup) period that forms a plurality of wall electric charges; Download (set down) period of a part of wall electric charge when wiping setting (setup) in the interim institute formation wall electric charge.And can be divided into the 1st rising stage and the 2nd rising stage (setup) period that is provided with.
In the 1st rising stage, all scan electrodes are all approved the 1st rising waveform that increases by exponential function.At this moment, the 1st rising waveform rises to and surpasses the VR voltage of keeping voltage.Meanwhile, the 1st rising waveform (waveform that exponential function increases) is so because the reason that increases by exponential function rises to Vr voltage with existing comparing in the shorter time.Be scanned electrode and approve if rise to the 1st rising waveform of Vr voltage, faint electric discharge phenomena take place in full frame cell cube, and in cell cube, generate the wall electric charge.Here, the 1st rising waveform is because have the degree of tilt rising that certain exponential function increases, so faint electric discharge phenomena take place in cell cube, thus in the present invention, under the situation that contrast does not descend the 1st rising waveform at short notice (with comparing in the past) rise to and surpass the Vr voltage keep voltage.Meanwhile, the 1st rising waveform among the present invention is because just can rise to Vr voltage at short notice, so can make the stable startup of discharge cell body.
The 2nd rising waveform that has the straight line rising of certain degree of tilt between the 2nd rising stage is approved by all scan electrodes simultaneously.At this moment, faint electric discharge phenomena take place in full frame cell cube, the wall electric charge takes place in cell cube.Here, the 2nd rising waveform rises to and keeps voltage and setting (setup) voltage sum from the voltage of Vr.Here, the 2nd rising waveform begins to rise from the voltage of Vr, so whole setting (setup) time is shorter than the original time.In other words, though in the past from the voltage of Vs begin the 1st time rise to keep voltage and setting (setup) voltage and, but in the present invention, from the Vr voltage higher than Vs begin to rise to keep voltage and setting (setup) voltage and, so original the 1st time of required time ratio will be lacked (when for example, same degree of tilt rises).
(set down) time of download is after the 2nd rising waveform is provided, and is scanned electrode simultaneously from the decline tilt waveform of comparing low cathode voltage decline with the 2nd rising waveform peak voltage and approves.Faint erasure discharge is by taking place in falling waveform in cell cube, wipe unnecessary electric charge in the wall electric charge of interim formation when (setup) is set and the space charge, and the wall electric charge to address discharge necessity in full frame cell cube retains fifty-fifty.
In address period, the negative pole scanning impulse is scanned electrode to be had when approving in proper order, and addressing electrode is approved anodal data pulse.With the voltage difference of scanning impulse and data pulse and the wall voltage addition of starting period generation, in the cell cube of approval data pulse, form address discharge.According to generating in the cell cube of address discharge selection the wall electric charge is arranged.
On the other hand, download in (set down) time and the address period, provide the anodal DC voltage of keeping voltage level (level) to keeping electrode.
Keep interim, scan electrode with keep electrode and alternately approve and keep pulse.The wall voltage of cell cube in cell cube of selecting according to address discharge with keep impulse summation in, when keeping the pulse approval, scan electrode causes the discharge discharge of keeping of form of face with keeping between the electrode.At last, after keeping discharge and finishing, to keep electrode provide the pulse width of cloth little wipe tilt waveform, the wall electric charge in the erase unit body.
Fig. 5 is the drive unit synoptic diagram according to the plasma display of the embodiment of the invention.
As reference Fig. 5, its formation of plasma display device driver according to the embodiment of the invention comprises with lower device: the 1st rising waveform generator 42 that is provided at the increasing function that increases by exponential function among the panel capacitance Cp, the 2nd rising waveform generator 44 and the energy recovery circuit 40 that provide panel capacitance Cp cathetus to rise, the 3rd switch S 3 that is provided with between the 1st rising waveform generator 42 and the 2nd rising waveform generator 44, the 2nd switch S 2 that is provided with between the 2nd rising waveform generator 44 and the energy recovery circuit 40, the panel capacitance Cp that is connected with the 1st rising waveform generator 42.
Panel capacitance Cp shows the electric capacity that forms in the discharge cell body of equal valuely.
The 1st rising waveform generator 42 provides the 1st rising waveform to panel capacitance Cp in the 1st upward period.For this reason, the 1st rising waveform generator 42 comprises: the 2nd resistance R 2 that is connected with panel capacitance Cp; The 4th switch S 4 that is connected between the 2nd resistance R 2 and the 2nd rising waveform generator 44.
The 4th switch is in on-state between the 1st rising stage, will provide to the 2nd resistance R 2 from the voltage that the 2nd rising waveform generator 42 provides.At this moment, the 2nd resistance R 2 forms series loop with panel capacitance Cp.Thus, the voltage that provides to panel capacitance increases by exponential function.In other words, provide the 1st rising waveform to panel capacitance Cp, here, the 2nd resistance R 2 is appended in the non-essential resistance of setting or electrode, the electric wire and is utilized one of them in the internal resistance that forms of equal value.
The 2nd rising waveform generator 44 provided the 2nd rising waveform to panel capacitance Cp in the 2nd rising stage.Meanwhile, the 2nd rising waveform generator 44 is in the 1st rising stage, with Vs+V
Be provided withVoltage provides to the 1st rising waveform generator 42.For this reason, the 2nd rising waveform generator 44 constitutes and comprises: capacitor C 1,1st switch S 1 in parallel with capacitor C 1; Limit the 1st variable resistor R1 of the channel width of cloth of the 1st switch S 1.
The 1st switch S 1 is in on-state in the 2nd rising stage, provide the 2nd rising waveform to capacitor C 1.In other words, be restricted according to the 1st variable resistor R1 channel width of cloth, the 2nd rising waveform with certain degree of tilt rising provides to channel capacitor C 1.
The operating process of identical therewith drive unit is described in detail with reference to Fig. 6.Here, suppose to charge into Vs+V to capacitor C 1
Be provided withVoltage describes.First-selected in the 1st rising stage the 4th switch S 4 and the 3rd switch S 3 be in on-state.If the 4th switch S 4 is connected, with the Vs+V of capacitor C 1
Be provided withVoltage provides to the 2nd resistance R 2.At this moment, the 2nd resistance R 2 is connected in series with channel resistance R 1, so the 1st rising waveform that is increased by exponential function is provided to channel capacitor C 1.On the other hand, the 4th switch S 4 is because be in the state of connection, so provide the 1st rising waveform voltage to the 1st node n1.
Afterwards, between the 2nd rising stage in, the 4th switch S 4 is in closing state, meanwhile, the 1st switch S 1 is connected, if the 1st switch S 1 is in on-state, capacitor C 1 voltage is through the 1st switch, the 3rd switch provides to panel capacitance Cp.At this moment, the 1st switch S 1 is restricted according to the 1st variable resistor R1 channel width of cloth, provides to the panel capacitance setting to have the 2nd long on certain degree of tilt rising waveform.
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 (3)
1. the drive unit of a plasma display is characterized in that being equipped with:
The panel capacitance that forms of equal value in the discharge cell body;
Be provided in the described panel capacitance and increase the rising waveform generator of rising waveform and the rising waveform generator that is equipped with panel capacitance cathetus rising waveform by exponential function;
The rising waveform generator that described exponential function increases rising waveform comprises: the 2nd resistance (R2) of connecting with described panel capacitance; Be connected in plasma display drive unit the 4th switch (S4) between voltage source and described the 2nd resistance (R2) is set;
The rising waveform generator of described straight line rising waveform comprises: be connected in plasma display drive unit the 1st electric capacity (C1) between voltage source and the energy recovery circuit is set; 1st switch (S1) in parallel with described the 1st electric capacity (C1); Limit the variable resistor (R1) of described the 1st switch (S1) the channel width of cloth.
2. the drive unit of plasma display as claimed in claim 1 is characterized in that:
Described the 4th switch (S4) relies on the 2nd resistance (R2) and described panel capacitance of series connection when connecting, the rising waveform that increases degree of tilt by exponential function provides to described panel capacitance.
3. the drive unit of plasma display as claimed in claim 1 is characterized in that:
The described generator that is equipped with the straight line rising waveform is after the rising waveform that increases by exponential function provides, and the rising waveform of straight line increase is provided to described panel capacitance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100673690A CN100375138C (en) | 2004-10-22 | 2004-10-22 | Plasma display driving device and driving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100673690A CN100375138C (en) | 2004-10-22 | 2004-10-22 | Plasma display driving device and driving method |
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| CN1763816A CN1763816A (en) | 2006-04-26 |
| CN100375138C true CN100375138C (en) | 2008-03-12 |
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| CNB2004100673690A Expired - Fee Related CN100375138C (en) | 2004-10-22 | 2004-10-22 | Plasma display driving device and driving method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339771A (en) * | 2000-08-24 | 2002-03-13 | 松下电器产业株式会社 | Plasma display flat panel display device and its driving method |
| CN1482590A (en) * | 2002-08-13 | 2004-03-17 | 富士通株式会社 | Method for driving plasma display panel |
| CN1495690A (en) * | 2002-07-26 | 2004-05-12 | 三星Sdi株式会社 | Device and method for driving plasma display panel |
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2004
- 2004-10-22 CN CNB2004100673690A patent/CN100375138C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339771A (en) * | 2000-08-24 | 2002-03-13 | 松下电器产业株式会社 | Plasma display flat panel display device and its driving method |
| CN1495690A (en) * | 2002-07-26 | 2004-05-12 | 三星Sdi株式会社 | Device and method for driving plasma display panel |
| CN1482590A (en) * | 2002-08-13 | 2004-03-17 | 富士通株式会社 | Method for driving plasma display panel |
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| CN1763816A (en) | 2006-04-26 |
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