CN1763813A - Plasma display driving method and device - Google Patents

Abstract

The invention discloses plasma display screen activation method and device, which comprises the following steps: dividing one image time into multiple subplaces; doing time-division activation of each subplace according to the restarting period, addressing period and maintaining period; displaying the image. The method can aim at admissible maintaining impulse amplitude or one item of impulse periodic time to do different assumptions in the maintaining period according to the subplace weighted value. The invention can do stable electric discharging in the low lightness weighted value subplace to enlarge the activation limit and increase the impulse quantity, which improves the display quality.

Description

Method for driving plasma display device and device

(1) technical field

The invention relates to plasma display, especially about increasing a kind of method for driving plasma display device and the device of display quality and reliability.

(2) background technology

Recently, the flat display apparatus that can obviously reduce the cathode-ray tube (CRT) weight and volume is more and more paid close attention to by people.Comprise liquid crystal indicator (Liquid Crystal Display:LCD), plasma display (Plasma Display Panel:PDP), field emission display device (FieldEmission Display:FED), electroluminescent device (Electro-Luminescence:EL) etc. in this flat display apparatus, these equipment provide the display device of energy display digit signal or simulated data for us.

Plasma display is to utilize He+Xe, and the ultraviolet ray of the 147nm that is sent during the mixed gas discharge of inert gases such as Ne+Xe and He+Ne+Xe makes light-emitting phosphor, and shows picture and the mobile image that comprises literal, picture.This plasma display can not only be easy to become ultra-thinization and maximization, and by means of the exploitation of technology recently, it can also increase substantially image quality.

Particularly 3 electrodes exchange the surface discharge type plasma display when discharge; utilize dielectric layer to carry out the accumulation of wall electric charge; reduce the discharge required voltage,, have advantages such as low voltage drive and life-span length because it can guard electrode not be subjected to plasma to swash the influence of penetrating.

What Fig. 1 showed is the discharge cell structure that 3 electrodes exchange the surface discharge type plasma display.

With reference to Fig. 1 as can be known, the discharge cell of 3 electrodes interchange surface discharge type plasma display is included in the scan electrode Y that forms on the upper substrate 10, the addressing electrode X that keeps formation on electrode Z and the lower basal plate 18.

Scan electrode Y and keep electrode Z and comprise transparency electrode 12Y, 12Z and littler than transparency electrode 12Y, 12Z width respectively is positioned at metal bus (BUS) electrode 13Y, the 13Z of transparency electrode one lateral edges.

The manufactured materials of transparency electrode 12Y, 12Z uses indium tin oxide (Indium-Tin-Oxide:ITO) usually.The manufactured materials of metal bus (BUS) electrode 13Y, 13Z uses chromium metals such as (Cr) usually.This metal bus (BUS) electrode 13Y, 13Z are positioned on transparency electrode 12Y, the 12Z, and utilize the big transparency electrode 12Y of resistance, 12Z to reduce voltage.Be arranged side by side scan electrode Y and kept on the upper substrate 10 of electrode Z also respectively that stack is provided with upper dielectric layer 14 and diaphragm 16.Ionized gas (plasma) charged particle that produces during 14 pairs of atmospherical dischargess of upper dielectric layer is accumulated.16 pairs of upper dielectric layers 14 of diaphragm are protected, and the charged particle that is produced when making it not to be subjected to gas discharge swashs projection and rings, and improves 2 electronics and emits efficient.Diaphragm 16 generally all uses magnesium oxide (MgO) to make.Addressing electrode X is arranged on scan electrode Y and keeps on the direction that electrode Z intersects.Be provided with on the lower basal plate 18 of addressing electrode X and also be provided with lower dielectric layer 22 and spaced walls 24.

Be provided with luminescent coating 26 on the surface of lower dielectric layer 22 and spaced walls 24.Spaced walls 24 is arranged side by side with addressing electrode X, and from physically discharge cell being separated, they are that the ultraviolet ray that is produced that is used for preventing to discharge is revealed away from the discharge cell that is connected with visible light.The luminescence-utraviolet that luminescent coating 26 is produced when relying on gas discharge, and any one visible light in generation red (R), green (G) or blue (B) light.In order to discharge, upwards/injected He+Xe, inert gas such as Ne+Xe and HE+NE+Xe in the formed discharge space between lower basal plate 10,18 and the spaced walls 24.

In order to embody the gray scale (Gray lever) that 3 electrodes exchange surface discharge type plasma display image, a picture is divided into a plurality of sons that number of light emission times has nothing in common with each other drives.Whether according to discharging by the selected discharge cell of address discharge, this plasma display dirving method roughly can be divided into selectivity and write (Selective Writing:SW) mode and selective erasing (Selective Erasing:SE) mode.

Fig. 2 is to use the plasma display picture pie graph of selectivity writing mode.

With reference to Fig. 2 as can be known, selectivity writes (SW) mode and can be divided into following 4 periods: evenly make each son field restarting the phase of discharge again; Select the address period of discharge cell; Embody keeping the phase of gray scale according to discharge time; Wipe the erasing period of the wall electric charge that all unit are generated in the phase of keeping.For example, if utilize 265 gray scales to come display frame, just a frame time (16.67ms) shown every 1/60 second to be divided into 8 sons (SF1 to SF8).8 son fields are divided into the phase of restarting, address period again again respectively, keep phase and erasing period.The phase of restarting and the address period of each son field all are unified, and in contrast, 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.Erasing period is decided by last height field in 8 son fields.As mentioned above, by different son field of the phase of keeping respectively combination embody gray scale.

Selectivity writes (SW) type of drive in the phase of restarting, whole image closed (Turn-off) after, in address period, utilize writing discharge and open (Turn-on) each discharge cell, and select each unit with this.The discharge of selected each discharge cell comes display frame in the address period by keeping in the phase of keeping.To keep in the erasing period and keep the charge erasure that discharge generates in the phase.

Fig. 3 is the oscillogram that shows the plasma display drive waveforms of using the selectivity writing mode.

X among Fig. 3, what Y, Z showed respectively is data electrode, scan electrode and the waveform of keeping signal that electrode provides.The selectivity of plasma display writes (SW) type of drive and can be divided into following several phase and drive: whole image is carried out initialized restarting the phase; The address period of selected cell; Keep the phase of keeping of selected cell discharge state and wipe the erasing period of keeping the discharge electric charge that generates.

The waveform difference that the phase of restarting is approved according to scan electrode Y can be divided into setting (setup) phase and download (setdown) phase.

Be provided with in (Setup) phase magnitude of voltage is increased to keep voltage (Vs) value after, all scan electrode Y are approved simultaneously according to time sequencing (ramp-up) waveform that tilts with the magnitude of voltage rising.Simultaneously, keep electrode Z and addressing electrode X approval basic voltage (GND).

According to (ramp-up) waveform of being approved by each scan electrode Y that tilts, between scan electrode Y in each unit of whole image and the addressing electrode X and scan electrode Y and keep between the electrode Z and start discharge.By starting discharge at addressing electrode X with keep the wall electric charge of accumulating positively charged (+) on the electrode Z, the wall electric charge of accumulation electronegative (-) on scan electrode Y.

Downloading (setdown) in the phase, after (ramp-up) waveform that tilts is provided, want the little voltage (Vs) of keeping to begin to descend according to time sequencing than the ceiling voltage of (ramp-up) waveform that tilts, basic voltage (GND) and (ramp-up) waveform that has a down dip that always drops to negative voltage are scanned electrode Y simultaneously and approve.Simultaneously, keep voltage (Vs) as the electrode Z approval positive polarity of keeping that common electrode uses, addressing electrode X approves basic voltage (0V).Approved (ramp-up) waveform that has a down dip if keep electrode Y, just at scan electrode Y with keep and carry out erasure discharge between the electrode Z.This erasure discharge from the wall electric charge that is produced in (Setup) phase is set, wipe address discharge unwanted unnecessary wall electric charge.

In address period, approve successively that at each scan electrode Y (SP), addressing electrode X and scanning impulse (SP) are approved data pulse (DP) to scanning impulse synchronously.Scanning impulse (SP) and the voltage difference of data pulse (DP) and the voltage addition that caused by generating the wall electric charge in the phase of restarting, simultaneously, is carried out address discharge in the approved unit of data pulse (DP).When voltage (Vs) was kept in approval in the selected unit by address discharge, generation can cause the wall electric charge of discharge.

On the other hand, reduce and to keep electrode Z in (setdown) phase of download and address period and the voltage difference between the scan electrode Y, and the DC voltage of positive pole is provided, be unlikely cause and scan electrode Y between misplace.

In the phase of keeping, scan electrode Y and keep electrode Z in turn approval keep pulse (SusPy, SusPz).By the selected unit of address discharge with the wall voltage in the unit with keep pulse (SusPy, SusPz) voltage addition, simultaneously keep pulse (SusPy at each, when SusPz) being approved, at scan electrode Y with keep between the electrode Z and keep discharge, promptly show discharge (keeping discharge).

In erasing period, provide pulse height and the little tilt waveform (ES) of voltage level to keeping electrode Z, by keeping discharge, wipe the wall electric charge residual in the unit of opening.

Write (SW) type of drive for this selectivity, in address period, must be set in a large number more than the 3 μ s, and in discharge cell, form fully many wall electric charges to the scanning impulse amplitude that scan electrode Y is provided.Therefore, write in selectivity in (SW) type of drive, address period needs a very long time, and this has just relatively reduced keeps (demonstration) phase, and brightness is reduced.Furtherly, when utilizing selectivity to write (SW) type of drive performance high-definition image, further increased address period, made the deficiency of holding time, thereby can't show gray scale.

In order to address this is that, just worked out selective erasing (SE) type of drive.

Fig. 4 is to use the plasma display picture pie graph of selective erasing mode.

With reference to Fig. 4 as can be known, each son field of selective erasing (SE) type of drive can be divided into the phase of restarting, address period and keep the phase.

In the phase of restarting, by write comprehensively the discharge make all unit open (Turn-on) after, in address period, close (Turn-off) each discharge cell by erasure discharge selectively, in the phase of keeping by keep in the address period the discharge of unselected each discharge cell come display frame.For example, if utilize 265 gray scales to come display frame, just a frame (16.67ms) shown every 1/60 second to be divided into 8 sons (SF1 to SF8).8 sons are divided into the phase of restarting, address period again again respectively and keep the phase.The phase of restarting and the address period of each son field all are unified, and in contrast, 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.As mentioned above, come representing gradation in the phase of keeping by each sub different combination.

This selective erasing (SE) type of drive is selected discharge cell by erasure discharge in address period, compare with the selectivity writing mode, and it can reduce the amplitude of scanning impulse, reduces address period.The address period that is saved be phase of keeping that can increase, improve brightness with this.

Fig. 5 is the oscillogram that shows the drive waveforms of the plasma display that uses the selective erasing mode.

With reference to Fig. 5 as can be known, 8 sons (SF1 to SF8) that comprised in the picture of plasma display originally can be divided into following 4 phases respectively: open all discharge cells in (Turn-on) plasma display, what make it to discharge restarts the phase; Close (Turn-off) selectively and restart the address period of selected each discharge cell in the phase; In address period, in each discharge cell of not selecting and keep keeping the phase of discharge.

The phase of restarting can be divided into again the inclination pulse (RPY ,-RPZ) be scanned electrode Y and keep phase that comprehensively writes that electrode Z approved and approval keep pulse (PY, PZ) keep pulse period.

Writing in the phase, the inclination pulse (RPY) to scan electrode Y provides anodal (+) provides the inclination pulse of negative pole (-) (RPY), addressing electrode X approval basic voltage (GND) to keeping electrode Z comprehensively.Here, the maximal value of the inclination pulse (RPY) of anodal (+) is set at and keeps the identical voltage of voltage (Vs).Simultaneously, with the inclination pulse of negative pole (-) (RPY) peaked absolute value be set at than keep the big absolute value voltage of voltage (Vs) (that is, | Vs|＜|-Vz|).Like this, writing in the phase comprehensively, by the inclination pulse (RPY) of anodal (+) is provided to scan electrode Y, to keeping inclination pulse that electrode Y provides negative pole (-) (RPY), the voltage difference of utilizing scan electrode Y and keeping between electrode (Z) restarts discharge in all discharge cells, open all discharge cells.

Writing in the phase comprehensively, if discharge has taken place to restart, the scan electrode Y that has been provided the inclination pulse (RPY) of anodal (+) just generates the wall electric charge of electronegative (-), be provided negative polarity (-) inclination pulse (RPY) keep the wall electric charge that electrode Z just generates positively charged (+).

In keeping pulse period, provide the 1st stable pulse (Pz) to keeping electrode (Z), simultaneously, provide the 2nd stable pulse (Py) to scan electrode Y.At this moment, the 1st stable pulse (Pz) and the 2nd stable pulse (Py) are set at to keep voltage (Vs) identical.Therefore, utilize scan electrode Y and keep between electrode Z to keep voltage (Vs) poor, at scan electrode Y with keep between the electrode Z and keep discharge, make all discharge cells evenly generate the wall electric charge.

In address period, provide scanning impulse (SP), and with scanning impulse (SP) synchronously, to provide data pulse (DP) to each scan electrode Y successively to each addressing electrode X.Thus, make to be provided in each discharge cell of data pulse (DP) and carry out address discharge,, make the wall charge erasure in the discharge cell if erasure discharge has promptly taken place.At this moment, fully keep the discharge cell inherence that erasure discharge does not take place and restart the wall electric charge that is generated in the phase.

In the phase of keeping, scan electrode Y and keep electrode Z in turn approval keep pulse (SusPy, SusPz).Then, in address period, do not wipe in the discharge cell of wall electric charge and keep discharge.At this moment, regulate and keep discharge time, just can demonstrate and the corresponding gray-scale value of luminance weighted value.

Fig. 6 shows the diagrammatic sketch of approving the workload Duty ratio of waveform according to method for driving plasma display device in the phase of keeping.

With reference to Fig. 6 as can be known, in the plasma display picture display process, in order to show specific gray scale, time period of a picture is divided into a plurality of sons, and again each son is divided into the phase of restarting, address period respectively and keeps the phase.Each son field has and suitable the keeping the phase of certain luminance weighted value, by to this combination of a little, just can demonstrate needed gray-scale value.

Keep that the shown gray scale numerical value that goes out is decided by the discharge time in the phase of keeping in the phase.In order to cause this discharge, in the phase of keeping, scan electrode (Y) and keep electrode (Z) and approve keeping pulse (keeping pulse) in turn.

Thisly keep pulse and have the cycle (t (i) Sus_cycle, t (j) Sus_cycle), each cycle can be divided into approval again and keep the burst length (t (i) Sus_On, t (j) Sus_On) and there be not approval to keep the burst length (t (i) Sus_OFF, t (j) Sus_OFF).To keep discharge in order causing safely, to keep in the cycle of pulse, (t (i) Sus_On, t (j) Sus_On) kept the burst length in approval must be fully.Thisly keep pulse approval (ON) phase and do not have the relative ratio of approval (OFF) phase just to be called as workload (Duty) ratio.

This workload (Duty) is than expressing by following mathematical expression.

[mathematical expression 1]

$\mathrm{Duty}\left(i\right)\mathrm{Sus}-\mathrm{ON}=\frac{t\left(i\right)\mathrm{Sus}-\mathrm{ON}}{(t\left(i\right)\mathrm{Sus}-\mathrm{On})+(t\left(i\right)\mathrm{Sus}-\mathrm{OFF})}$

In general, the type of drive of the plasma display Duty that will embody the son (for example, the 1st son) of low-light level weighted value and embody the son (for example, the 8th son field) of high brightness weighted value is set to identical.For example, in high j the son of low i son of luminance weighted value and luminance weighted value, pulse period (ON) is kept in approval and do not approved that the time period (OFF) of keeping pulse is set at identical.Simultaneously, the cycle (t (i) Sus_cycle, t (j) Sus_cycle) of keeping pulse is set at the same time.

This relation of keeping the recurrence interval is showed by following mathematical expression 2.

[mathematical expression 2]

t(i)Sus_cycle＝t(j)Sus_cycle

Here, t (i) Sus_cycle refers to the cycle of keeping pulse in the son field of low-light level weighted value, and t (j) Sus_cycle refers to the cycle of keeping pulse in the son field of high brightness weighted value.

Recently, people are attempting to improve the contrast (contrast) of one of the key factor of decision plasma display image quality.One of them method is to improve to keep the frequency of keeping pulse in the phase, increases discharge time, improves brightness peak (Peak Brightness).But, for this method because in picture the phase of keeping be limited, therefore, frequency can not be brought up to very high level.

Simultaneously, with simple to calculate total load (TotalLoad) computing method of weighted value according to each gray-scale value in the display unit different, even the relevant gray-scale value of display unit is very low, but, according to there being much areas can video data in the picture on earth, the limit of driving (margin) also be different.As shown in Figure 7, if what show in many areas all is low gray-scale value, performance is exactly that discharge is kept in the son field that shows the low-light level weighted value in most sons.But, keep in the phase in this seed field, if keep cycle of pulse and workload (Duty) than inadequate words, just do not discharge, drive limit and just descend immediately, independent mutually with whole cumulative data number, relevant area just can't carry out the steady display discharge, and reliability has just descended.Simultaneously, according to display state, increased the local or whole possibility that misplaces electricity.

As mentioned above, general plasma display dirving method all be with all sons in the picture keep the recurrence interval and workload (Duty) is fixed than numerical value, keep (demonstrations) and discharge.If make in this way, when wanting to show large-area low gray-scale value, allow the son field of the low gray-scale value of performance carry out stable discharging and be difficult to, make to drive limit and reduce reliability decrease.

Simultaneously, when wanting to show high gray-scale value, a large amount of discharges of keeping can't be carried out in the son field that shows high gray-scale value, and display quality is descended.

(3) summary of the invention

Therefore, need the problem of solution to be now, need a kind of plasma display dirving method and device, make the son field of the low gray-scale value of performance carry out the stable discharge of keeping, make the sub-field energy of the high gray-scale value of performance carry out a large amount of discharges of keeping.

Purpose of the present invention is exactly that a kind of a kind of method for driving plasma display device and device that can increase display quality and reliability will be provided.

To achieve these goals, method for driving plasma display device of the present invention has following feature: the time period of a picture is divided into a plurality of sons field, and according to the phase of restarting, address period and the phase of keeping the time-division driving is carried out in each son field respectively, and display image.According to the weighted value of above-mentioned son, to the major general above-mentioned keep in the phase to be approved keep pulse height or in the recurrence interval one carries out different set.

Has the feature that comprises following steps according to method for driving plasma display device of the present invention:, above-mentioned pulse height and recurrence interval are carried out conversion step according to the weighted value of above-mentioned son field.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, its pulse height will be reduced more.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, its Duty numerical value will be reduced more.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, its pulse height will be increased more.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, its Duty numerical value will be increased more.

Have the feature that comprises following function according to method for driving plasma display device of the present invention: consistent with the sub-field pulse amplitude decrease of performance high brightness weighted value, the pulse number of the sub-place approval of increase performance high brightness weighted value.

Have the feature that comprises following function according to method for driving plasma display device of the present invention: consistent with the sub-field pulse amplitude decrease of performance high brightness weighted value, the pulse height of the sub-place approval of increase performance low-light level weighted value.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, its PRT will be reduced more.

Has the feature that comprises following function according to method for driving plasma display device of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, its PRT will be increased more.

Have the feature that comprises following function according to method for driving plasma display device of the present invention: consistent with sub-field pulse decrease cycle length of performance high brightness weighted value, the PRT of a son approval of increase performance low-light level weighted value.

Have the feature that comprises following function according to method for driving plasma display device of the present invention: consistent with sub-field pulse decrease cycle length of performance high brightness weighted value, the pulse number of the sub-place approval of increase performance high brightness weighted value.

According to the feature that plasma display device driver of the present invention had is that the pulse generation device of keeping with following function has been installed: the time period of a picture is divided into a plurality of sons field, and according to the phase of restarting, address period and the phase of keeping the time-division driving is carried out in each son field respectively, and display image.According to the weighted value of above-mentioned son, to the major general above-mentioned keep in the phase to be approved keep pulse height or in the recurrence interval one carries out different set.

The above-mentioned pulse generation device of keeping has the feature that is made of following each several part: the time regulator that produces switch controlling signal (having and above-mentioned each a son corresponding pulse height and recurrence interval); The data driven unit of driving data electrode; The scanning driving device of driven sweep electrode; Drive the above-mentioned drive unit of keeping of keeping electrode; Be connected with the above-mentioned drive unit of keeping with above-mentioned scanning driving device, the switch controlling signal that utilizes above-mentioned time regulator to generate, control at least to above-mentioned scanning driving device and above-mentioned keep that drive unit provides keep pulse height and one pulse gauge tap in the cycle.

Have the feature that comprises following function according to plasma display device driver of the present invention: the weighted value according to above-mentioned son field changes above-mentioned pulse height and above-mentioned recurrence interval.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, above-mentioned pulse height will be reduced more.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, the Duty value will be reduced more.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, above-mentioned pulse height will be increased more.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, the Duty value will be increased more.

Have the feature that comprises following function according to plasma display device driver of the present invention: consistent with the decrease of pulse height in the son of above-mentioned performance high brightness weighted value, increase the pulse number of the sub-place approval of above-mentioned performance high brightness weighted value.

Have the feature that comprises following function according to plasma display device driver of the present invention: consistent with the decrease of pulse height in the son of above-mentioned performance high brightness weighted value, increase the pulse height of the sub-place approval of above-mentioned performance high brightness weighted value.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of high brightness weighted value, above-mentioned PRT will be reduced more.

Has the feature that comprises following function according to plasma display device driver of the present invention: in above-mentioned son field, show the son field of low-light level weighted value, above-mentioned PRT will be increased more.

Have the feature that comprises following function according to plasma display device driver of the present invention: consistent with the decrease of PRT in the son of above-mentioned performance high brightness weighted value, increase the PRT of the sub-place approval of above-mentioned performance high brightness weighted value.

Have the feature that comprises following function according to plasma display device driver of the present invention: with in the son of above-mentioned performance high brightness weighted value in the decrease of PRT consistent, increase the pulse number of being approved in the son of above-mentioned performance high brightness weighted value.

Effect of the present invention:

As mentioned above, can and keep the recurrence interval and carry out different set the pulsed operation amount of keeping (Duty) ratio approved in the phase of keeping according to the method for driving plasma display device of the embodiment of the invention and device.Thus, in the son field of performance low-light level weighted value, carry out stable discharging, enlarge the driving limit, improve fiduciary level.In the son field of performance high brightness weighted value, increase sub pulse number, thereby produce many discharges, increase brightness.Therefore, it can improve the display quality of plasma display.

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

What Fig. 1 showed is the discharge cell structure that 3 electrodes exchange the surface discharge type plasma display.

Fig. 2 is to use the plasma display picture pie graph of selectivity writing mode.

Fig. 3 is the oscillogram that shows the plasma display drive waveforms of using the selectivity writing mode.

Fig. 4 is to use the plasma display picture pie graph of selective erasing mode.

Fig. 5 is the oscillogram that shows the drive waveforms of the plasma display that uses the selective erasing mode.

Fig. 6 shows the diagrammatic sketch of approving workload (Duty) ratio of waveform according to method for driving plasma display device in the phase of keeping.

Fig. 7 is the data payload distribution plan that shows shown picture in the plasma display.

Fig. 8 is picture formation and the oscillogram that is used for illustrating according to the method for driving plasma display device of the present invention the 1st embodiment.

Fig. 9 is picture formation and the oscillogram that is used for illustrating according to the method for driving plasma display device of the present invention the 2nd embodiment.

Figure 10 (a) and (b) are according to plasma display apparatus constituent components figure of the present invention.

The symbol description of major part in the accompanying drawing:

10: upper substrate 18: lower basal plate

Y: scan electrode Z: keep electrode

X: addressing electrode 12Y, 12Z: transparency electrode

13Y, 13Z: metal bus (bus) electrode 14: upper dielectric layer

16: diaphragm 22: lower dielectric layer

24: spaced walls 26: luminescent coating

51: scanning driving device 53: keep drive unit

55: data driven unit 57: time regulator

59,69: the pulse gauge tap

(5) embodiment

Below, 8 to Figure 10 method for driving plasma display device of the present invention and device be elaborated with reference to the accompanying drawings.

Be applicable to fully that according to method for driving plasma display device of the present invention and device selectivity writes (SW) mode, selective erasing (SE) mode and above-mentioned selectivity and writes the selectivity that (SW) mode and selective erasing (SE) mode combine and write (SWSE) mode of wiping.

With reference to Fig. 8 as can be known, for plasma display dirving method, the gray-scale value that the phase of keeping embodies is by the discharge time decision of being carried out in the phase of keeping.In order to cause this discharge, in the phase of keeping, scan electrode Y and keep electrode Z and must approve in turn and keep pulse.

Thisly keep pulse and have the cycle (t (i) Sus_cycle, t (j) Sus_cycle), each recurrence interval can be divided into approval again and keep pulse period (t (i) Sus-On, t (j) Sus_On) and there be not approval to keep pulse period (t (i) Sus_OFF, t (j) Sus_OFF).

Will be in the phase of keeping according to the type of drive of the plasma display of the present invention the 1st embodiment, workload (Duty) ratio that embodies the son of low-light level weighted value and embody the sub-place approval of high brightness weighted value is set to inequality.

For this is elaborated, will shows keep the burst length (t (j) Sus_On) that j the son (for example, the 8th son) of high brightness weighted value approved according to the type of drive of the plasma display of the present invention the 1st embodiment and reduce.

Consistent with a j son reduction of keeping the burst length (t (j) Sus_On) that (for example, the 8th son field) approved of performance high brightness weighted value, the quantity of pulse is kept in the sub-place approval that increases performance high brightness weighted value.If increased the quantity of keeping pulse, just can produce quantity many keep discharge, thereby increase brightness.

With j son field of performance high brightness weighted value (for example, the 8th son field) reduction of being approved of keeping the burst length (t (j) Sus_On) is consistent, i the son (for example, the 1st sub) that increases performance low-light level weighted value approved the service time (t (i) Sus_On) of keeping pulse.Keep the service time of pulse if increase, just can more stablely keep discharge.If can keep discharge, become greatly just drive limit, reliability just can strengthen.

According to this method, the pulsed operation amount of keeping (Duty) ratio of the sub-place approval of performance low-light level weighted value can be described with following mathematical expression.

[mathematical expression 3]

$\mathrm{Duty}\left(i\right)\mathrm{Sus}-\mathrm{ON}=\frac{(t\left(i\right)\mathrm{Sus}-\mathrm{ON})}{(t\left(i\right)\mathrm{Sus}-\mathrm{ON})+t(i)\mathrm{Sus}-\mathrm{OFF})}$

According to this method, the pulsed operation amount of keeping (Duty) that the sub-place approval that shows the high brightness weighted value can be described with following mathematical expression is than (claiming Duty).

[mathematical expression 4]

$\mathrm{Duty}\left(j\right)\mathrm{Sus}-\mathrm{ON}=\frac{(t\left(j\right)\mathrm{Sus}-\mathrm{ON})}{(t\left(j\right)\mathrm{Sus}-\mathrm{ON})+t\left(j\right)\mathrm{Sus}-\mathrm{OFF})}$

If use the method for utilization the present invention the 1st embodiment, in the son of performance low-light level weighted value, approved keep pulsed D uty with in the son field of performance high brightness weighted value, approved to keep pulsed D uty different.

Following mathematical expression can be explained.

[mathematical expression 5]

Duty(i)Sus_On ∈Duty(j)Sus_On

Fig. 9 is picture formation and the oscillogram that is used for illustrating according to the method for driving plasma display device of the present invention the 2nd embodiment.

For plasma display dirving method, keep that the shown gray scale numerical value that goes out is decided by the discharge time in the phase of keeping in the phase.In order to cause this discharge, in the phase of keeping, scan electrode Y and keep electrode Z and approve keeping pulse (demonstration pulse) in turn.

Thisly keep pulse and have the cycle (t (i) Sus_cycle, t (j) Sus_cycle), each cycle can be divided into approval again and keep the burst length (t (i) Sus_On, t (j) Sus_On) and there be not approval to keep the burst length (t (i) Sus_OFF, t (j) Sus_OFF).

Method for driving plasma display device according to the present invention the 2nd embodiment is that different set is carried out with the j that shows the high brightness weighted value keep the recurrence interval [(t (i) Sus_cycle), (t (j) Sus_cycle)] that sub-place is approved in i the son field that shows the low-light level weighted value in holding time.

In detail, be exactly to show j of high brightness weighted value son (for example, the 8th son) approved keep the burst length (t (j) Sus_On) and keep not approved time of pulse (t (j) Sus_On) minimizing.Keep pulse by minimizing simultaneously and open (ON) and (OFF) time of closing, reduce the cycle (t (j) Sus_cycle) of keeping pulse.

To keep the recurrence interval consistent time that (t (j) Sus_cycle) saved with j the son that reduces performance high brightness weighted value (for example, the 8th son), is increased in the quantity of being approved in the son field of performance high brightness weighted value of keeping pulse.Keep the quantity of pulse if increase, more keep discharge, thereby improve brightness just can produce.

Simultaneously, with j the son field of reducing performance high brightness weighted value (for example, the 8th son) to keep the recurrence interval consistent time that (t (j) Sus_cycle) saved, be increased in the son of performance low-light level weighted value the time of keeping pulse (t (j) Sus_On) that (for example, the 1st son) approved and keep the not approved time of pulse (t (j) Sus_On).If increase simultaneously and keep the time (t (j) Sus_On) that pulse gets the nod and keep the not approved time of pulse (t (j) Sus_On), keep the recurrence interval (t (j) Sus_cycle) time just can increase.

Thus, in the son field of performance low-light level, just can produce the stable discharge of keeping, enlarge the driving limit, strengthen reliability.

If utilization is according to the method for driving plasma display device of the present invention the 2nd embodiment, approved in the time of in i son of performance low-light level weighted value, being approved of keeping pulse (t (i) Sus_cycle) and j the sub-field in performance high brightness weighted value to keep the burst length (t (j) Sus_cycle) different.

Following mathematical expression can be explained.

[mathematical expression 6]

t(i)Sus_cycle≥t(j)Sus_cycle

Figure 10 is according to plasma display apparatus constituent components figure of the present invention.

Plasma display apparatus of the present invention has been installed and has been kept pulse generation device, and time period of a frame is divided into a plurality of sons, and according to the phase of restarting, address period and the phase of keeping the time-division is carried out in each son field respectively and drive, and display image; According to the weighted value of described son, to the major general described keep in the phase to be approved keep pulse height or in the recurrence interval one carries out different set.

With reference to Figure 10 (a) and (b) as can be known, formed by following each several part according to plasma display device driver of the present invention: the data driven unit 55 that the addressing electrode X of plasma display drives; The scanning driving device 51 that the scan electrode Y of plasma display drives; Plasma display keep that electrode Z drives keep drive unit 53; The time regulator 57 that the driving time of plasma display is controlled; To Be Controlled scanning driving device 51 with keep the data sorting device that there are device in the γ correcting device, automatic gain regulating device, error diffusion device, data searcher, a son mapping device, the picture that do not show on pulse gauge tap 59,69 that voltage Vs that drive unit 53 approved controls and the figure and according to driver IC data are arranged.

Data driven unit 55 is connected respectively with a certain number of addressing electrode X, and comprises a plurality of data driver IC that data are provided to relevant addressed electrode X.

Scanning driving device 51 is connected with each scan electrode Y, provides to each scan electrode Y simultaneously and restarts pulse (or pulse is set).In addition, in address period, scanning driving device 51 after each scan electrode Y provides scanning impulse, in the phase of keeping, provides to each scan electrode Y simultaneously and keeps pulse successively.

Keep drive unit 53 and keep respectively that electrode Z is common to be connected, supply with and keep pulse to respectively keeping electrode Z simultaneously.

Time regulator 57 receive the vertical/horizontal synchronizing signals (H, V), rise time control signal, and this time control signal offered data driven unit 55, scanning driving device 51 and keep drive unit 53, the driving time of control plasma display.After this, it also generates switch controlling signal tc1 (SF), tc2) (SF), to scan electrode Y with keep each pulse gauge tap 59,69 that electrode Z is connected and provide, and control obtains scan electrode Y and keeps the pulse of keeping of electrode Z approval.

Pulse gauge tap 59,69 and scan electrode Y with keep electrode Z and be connected, and the switch controlling signal tc1 that is generated according to time regulator 57,, tc2, control to scan electrode Y and keep the pulse of keeping that electrode Z supplied with.This switch controlling signal tc1 and tc2 are approved by each pulse gauge tap 59,69 mutually in turn.

Below this is elaborated.If provide the switch controlling signal tc1 that is generated by time regulator 57 (ON), just pulse gauge tap 59 is opened (Turn-On) to the pulse gauge tap 59 that is connected with scanning driving device 51.If pulse gauge tap 59 just is opened (Turn-On), keep voltage (Vs) just provide to scanning driving device 51, scan electrode Y just approves and keeps pulse.After this, if do not provide switch controlling signal tc1, just pulse gauge tap 59 is closed (Turn-Off) to pulse gauge tap 59.If pulse gauge tap 59 just is closed (Turn-Off), do not keep voltage (Vs) just do not provide to scanning driving device 51, scan electrode is not just approved and is kept pulse.

On the other hand, if to providing the switch controlling signal tc2 that is generated by time regulator 57 (ON), just pulse gauge tap 69 is opened (Turn-On) with keeping the pulse gauge tap 69 that drive unit 53 is connected.If pulse gauge tap 69 just is opened (Turn-On),, keeps electrode Z and just approve and keep pulse just provide and keep voltage (Vs) to keeping drive unit 53.After this, if do not provide switch controlling signal tc2, just pulse gauge tap 69 is closed (Turn-Off) to pulse gauge tap 69.If pulse gauge tap 69 just is closed (Turn-Off), do not keep voltage (Vs) just do not provide to scanning driving device 51, scan electrode is not just approved and is kept pulse.

Be scanned electrode Y and keep (t (i) Sus_cycle that keeps the recurrence interval that electrode X approved, t (j) Sus_cycle) and Duty (Duty (i), Duty (j)) by with scan electrode Y with keep the switch controlling signal tc1 that pulse gauge tap 59,69 that electrode X is connected is provided,, tc2 controls.

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 (25)

1, a kind of method for driving plasma display device is characterized in that comprising:

The time period of a picture is divided into a plurality of sons field, and according to the phase of restarting, address period and the phase of keeping the time-division driving is carried out in each son field respectively, and display image;

According to the weighted value of described son, to the major general described keep in the phase to be approved keep pulse height or in the recurrence interval one carries out different set.

2, method for driving plasma display device as claimed in claim 1 is characterized in that:

According to the weighted value of described son, the step that described pulse height and recurrence interval are changed.

3, method for driving plasma display device as claimed in claim 2 is characterized in that:

In described son field, show the son field of high brightness weighted value, its pulse height to be reduced more.

4, method for driving plasma display device as claimed in claim 3 is characterized in that:

In described son field, show the son field of high brightness weighted value, its workload to be reduced than numerical value more.

5, method for driving plasma display device as claimed in claim 3 is characterized in that:

In described son field, show the son field of low-light level weighted value, its pulse height to be increased more.

6, method for driving plasma display device as claimed in claim 5 is characterized in that:

In described son field, show the son field of low-light level weighted value, its workload to be increased than numerical value more.

7, method for driving plasma display device as claimed in claim 4 is characterized in that:

Consistent with the sub-field pulse amplitude decrease of described performance high brightness weighted value, the pulse number of the sub-place approval of increase performance high brightness weighted value.

8, method for driving plasma display device as claimed in claim 6 is characterized in that:

Consistent with the sub-field pulse amplitude decrease of described performance high brightness weighted value, the pulse height of the sub-place approval of increase performance low-light level weighted value.

9, method for driving plasma display device as claimed in claim 2 is characterized in that:

In described son field, show the son field of high brightness weighted value, its PRT to be reduced more.

10, method for driving plasma display device as claimed in claim 9 is characterized in that:

In described son field, show the son field of low-light level weighted value, its PRT to be increased more.

11, method for driving plasma display device as claimed in claim 10 is characterized in that:

Consistent with sub-field pulse decrease cycle length of described performance high brightness weighted value, increase a son PRT of approving that shows the low-light level weighted value.

12, method for driving plasma display device as claimed in claim 10 is characterized in that:

Consistent with sub-field pulse decrease cycle length of described performance high brightness weighted value, the pulse number of the sub-place approval of increase performance high brightness weighted value.

13, the applied plasma display device driver of a kind of method for driving plasma display device as claimed in claim 1 is characterized in that comprising:

Installed and kept pulse generation device, time period of a frame has been divided into a plurality of sons, and according to the phase of restarting, address period and the phase of keeping the time-division has been carried out in each son field respectively and drive, and display image; According to the weighted value of described son, to the major general described keep in the phase to be approved keep pulse height or in the recurrence interval one carries out different set.

14, plasma display device driver as claimed in claim 13 is characterized in that:

Generation has the time regulator with described each son corresponding pulse height and the switch controlling signal of recurrence interval;

The data driven unit of driving data electrode;

The scanning driving device of driven sweep electrode;

The drive unit of keeping of electrode is kept in driving;

Be connected with the described drive unit of keeping with described scanning driving device, the switch controlling signal that utilizes described time regulator to generate, control at least to described scanning driving device and described keep that drive unit provides keep pulse height and one the gauge tap of pulse in the cycle.

15, as described in the claim 14, have the plasma display device driver that comprises following functional character, it is characterized in that:

Weighted value according to described son field changes described pulse height and above-mentioned recurrence interval.

16, plasma display device driver as claimed in claim 15 is characterized in that:

In described son field, show the son field of high brightness weighted value, above-mentioned pulse height to be reduced more.

17, plasma display device driver as claimed in claim 16 is characterized in that:

In described son field, show the son field of high brightness weighted value, workload ratio to be reduced more.

18, plasma display device driver as claimed in claim 15 is characterized in that:

In described son field, show the son field of low-light level weighted value, described pulse height to be increased more.

19, plasma display device driver as claimed in claim 15 is characterized in that:

In described son field, show the son field of low-light level weighted value, workload ratio to be increased more.

20, plasma display device driver as claimed in claim 16 is characterized in that:

Consistent with the decrease of pulse height in the son of described performance high brightness weighted value, increase the pulse number of the sub-place approval of described performance high brightness weighted value.

21, plasma display device driver as claimed in claim 17 is characterized in that:

Consistent with the decrease of pulse height in the son of described performance high brightness weighted value, increase the pulse height of the sub-place approval of described performance high brightness weighted value.

22, plasma display device driver as claimed in claim 15 is characterized in that:

In described son field, show the son field of high brightness weighted value, described PRT to be reduced more.

23, plasma display device driver as claimed in claim 22 is characterized in that:

In described son field, show the son field of low-light level weighted value, described PRT to be increased more.

24 plasma display device drivers as claimed in claim 23 is characterized in that:

Consistent with the decrease of PRT in the son of described performance high brightness weighted value, increase the PRT of the sub-place approval of described performance high brightness weighted value.

25, plasma display device driver as claimed in claim 23 is characterized in that:

Consistent with the decrease of PRT in the son of described performance high brightness weighted value, increase the pulse number of being approved in the son of described performance high brightness weighted value.

Images