CN1750093A - Driving method for plasma display high picture quality - Google Patents

Abstract

The driving method for raising the image quality of plasma display includes adopting interlaced scanning in four low-weighting sub-fields; and adding the display data corresponding to the two low-weighting sub-fields of the foregoing line and the display data corresponding to the two low-weighting sub-fields of the newly input line to make the sum of the display data of the four low-weighting sub-fields equal to the sum of the display data corresponding to two adjacent lines in the input signal and to obtain the display data of four low-weighting sub-fields. The present invention has reduced display line number and decreased scanning time, and thus may have more sub-fields to display the same maximum brightness. The combined action of the increase in sub-field number and the decrease of minimum weighting maintaining pulse number reduces the lowest grey level capable of being displayed and raises the grey resolution and the image quality.

Description

A kind of driving method of plasma display high picture quality

Technical field

The invention belongs to the gas discharge technical field, be specifically related to a kind of driving method of plasma display high picture quality.

Background technology

The plasma display (Plasma Display Panel) that utilizes Discharge illuminating is owing to have characteristics such as wide visual angle, giant-screen, high brightness, minimal thickness, becomes one of the most competitive product on the display device market of giant-screen, minimal thickness.At present plasma display improve picture quality, reduce power consumption, aspect such as reduce cost also needs further raising.

Three-electrode surface discharge type plasma display has scan electrode, keep electrode and with scan electrode and the addressing electrode of keeping the electrode omnidirectional distribution.With scan electrode, the point of crossing of keeping electrode, addressing electrode is that the center has just formed and can represent redness or green or blue display unit.Scan electrode with keep electrode and be produced on the prebasal plate, and made dielectric layer and mgo protection layer again on scan electrode and the top of keeping electrode.Addressing electrode is produced on the metacoxal plate, for prevent between the horizontal adjacent display cell optics and electric on interfere with each other, between addressing electrode, also made the barrier of certain altitude.Be separated into the strip groove by barrier on the infrabasal plate, the height of barrier has also just determined the discharge space between prebasal plate and the metacoxal plate, charges into inert mixed gas such as He+Xe, Xe+Ne, He+Xe+Ne in discharge space.Applied the fluorescent powder of different colours on the bottom of strip groove and side, arranged according to red, green, blue respectively, these fluorescent powder apply the ultraviolet ray excited back that high-voltage discharge produces between electrode just can produce visible light.

Most plasma displays adopt the driving method of addressing and display separation, and this driving method is that each frame data is divided into 8 son fields, and each height field is divided into preparatory stage, address period, keeps the phase.Apply the ramp voltage of positive dirction linear change and the ramp voltage of negative direction linear change successively on all scan electrode of preparatory stage; Keep electrode and apply no-voltage, and apply positive voltage in the decline ramp voltage section of scan electrode in the acclivity voltage section of scan electrode; Apply no-voltage on all addressing electrodes.The used time of each height field preparatory stage all is invariable.The voltage of keeping on the electrode in address period remains unchanged, and apply addressing pulse on each scan electrode successively, the width that the used time of address period equals addressing pulse multiply by the number of addressing electrode, so used time of each height field address period is identical, and in direct ratio with the number of addressing electrode.Correspondingly with each addressing pulse on addressing electrode, apply the data-driven pulse of being correlated with the institute video data of wanting.After each driving pulse that the process address period applies, will produce on the dielectric surface of keeping electrode and scan electrode of each pixel correspondence and the corresponding wall electric charge of data to display.The voltage of keeping on the phase addressing electrode remains zero constant, and apply the staggered pulse of keeping on electrode and the scan electrode successively keeping, thereby make the voltage that bears alternation on the display unit, keep the latter stage in cycle and need keep the erasing pulse that applies quick changes in voltage on the electrode.Keep the voltage of keeping that bears alternation between electrode and the addressing electrode in the cycle of keeping, so each pixel also will carry out luminous according to the wall state of charge that applies in address period, if address period has accumulated certain wall electric charge, just keep luminous in the phase of keeping, and not accumulating the wall electric charge in address period, the phase of keeping also just can not be luminous.In traditional driving method, it is in direct ratio substantially with the number of keeping pulse that the time in cycle is kept in each son field.In order to realize that gray scale shows that the weight ratio that pulse number is kept in each height field is: 1: 2: 4: 8: 16: 32: 64: 128.So keeping the time in cycle, each height field also distributes in this ratio substantially.

Each frame of conventional ADS driving method all is made of 8 son fields, and the arrangement of the son of consecutive frame is identical.In low weight, need addressing is carried out in all provisional capitals, so the addressing time of its addressing time and the son field of other high weight all is identical.Owing to adopt the mode of son field to realize that full color shows that dynamic false contour can appear in this driving method.In order to suppress the false contouring phenomenon, an effective method is exactly to improve sub number, but the number of raising field can increase the time of addressing, really is used to keep the luminous effective demonstration time thereby reduce, and display brightness is reduced.This is particularly serious in high-resolution color plasma display.Can to adopt Plasma AI driving method in order addressing this problem, to that is to say and when high-brghtness picture images, adopt the more driving method of sub-number of fields order, and when low-light level, adopt the less driving method of sub-number of fields order.False contouring phenomenon in the time of can suppressing high-brghtness picture images like this also has high peak brightness simultaneously when low-luminosity picture.Because the false contouring phenomenon of human eye during only to high-brghtness picture images is relatively more responsive, and the false contouring phenomenon during to low-luminosity picture is insensitive, so this driving method is improving aspect the picture quality very effectively, has obtained using widely.But because the sub-number of fields order that adopts when low-luminosity picture is fewer, minimum gray-scale displayed grade also can be bigger simultaneously, so picture quality at this moment is bad, the stereovision that outstanding characteristic are low-luminosity pictures is not strong.

Summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of minimal gray resolution characteristic that can improve plasma display is provided, thereby make the driving method that when low-luminosity picture, improves the plasma display high picture quality of display quality.

The present invention mainly is the situation when having determined to adopt fewer sub-number of fields order according to input picture when adopting Plasma AI technology, this moment, minimum sub-number of fields order was 8, and total to keep pulse number many, smallest sub-fields to keep pulse number also corresponding many, so this moment, the minimal gray resolution characteristic was lower.Under other sub-number of fields order situation, if low weight to keep ratio of pulse length to the total cycle length more, the situation that the minimal gray resolution characteristic is lower also can be used this driving method.

For achieving the above object, the technical solution used in the present invention is: at first the characteristics according to drive waveforms are divided into eight son fields in a frame, be called low weight with keeping the pulse number weight less son field that compares, be called high weight field and keep the relatively big son field of pulse number weight, be characterized in, four sons employing staggered scanning in low weight, at odd field odd-numbered line is carried out staggered scanning respectively, the dual numbers row carries out staggered scanning when even field, but when showing, after the new video data of delegation is come in, the video datas that front delegation two low weight field is corresponding carry out addition with the video data of two low weights of new line of input, the summation of four sons corresponding video data of low weight equals the summation of the video data of the correspondence of adjacent two row in the input signal, obtain the video data of each height field of four low weight fields, being about to each height field keeps the weight of pulse number and is set to: 2/5: 4/5: 8/5: 16/5: 4: 8: 16: 32: 64: 128, amount to 10 sons.

As described below: as when low weight field, in parity field odd-numbered line and even number line are carried out staggered scanning respectively, but video data of each row will not to have data presented to comprise to come in to adjacent not scan line.

Because the number of display line of the present invention reduces, and has reduced sweep time, so can adopt more son field to show the brightness of identical maximum.So number of fields purpose increase has just reduced the minimal gray grade that can show with the acting in conjunction that reduces that minimal weight is kept pulse number, thereby has improved the resolution characteristic of minimal gray, promptly can improve the picture quality of demonstration.

Description of drawings

Fig. 1 is adjacent two two field pictures of a present invention distribution synoptic diagram;

Fig. 2 is the distribution synoptic diagram of the present invention low weight field when the display gray scale image;

Fig. 3 is the addressing that proposes of the present invention and the input data-switching synoptic diagram of display separation driving method.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

Referring to Fig. 1, each frame of the present invention as seen from Figure 1 all is to be made of 10 son fields, and it is identical that same odd-numbered frame is arranged with the son field of even frame.Its weight is 4,8,16,32,64,128 6 sons (as shown in Figure 1 the six～ten son) and conventional ADS driving method weight is that the arrangement of 4,8,16,32,64,128 6 sons is identical, this a little will be to all line scannings of advancing, so the addressing time also is identical.The driving method that the present invention proposes is compared existence with conventional ADS driving difference only is on four son fields of low weight (sub of first of Fig. 1～4th), in the son field of these four low weights, only odd-numbered line is carried out addressing in odd-numbered frame, because the number of addressing electrode is whole half, the used addressing time is half of conventional ADS driving method, keep the luminous pixel place that also only can occur in the odd-numbered line correspondence, but this moment, four low weights were total keep pulse number and be two low weights of conventional ADS driving method field always keep pulse number and twice, the present invention is kept Discharge illuminating and can show the pairing video data of the corresponding even number line odd-numbered line place that is added to what four the sub-place of low weight data presented of odd-numbered line produced.In the son of four low weights of even frame, dual numbers row carries out addressing, the used addressing time also is half of conventional ADS driving method, keep the luminous pixel place that also only can occur in the even number line correspondence, but this moment, four low weights were total keep pulse number and be two low weights of conventional ADS driving method field always keep pulse number and twice, the present invention is kept Discharge illuminating and can show the pairing video data of the corresponding odd-numbered line even number line place that is added to what four the sub-place of low weight data presented of even number line produced.The present invention is in four low weight fields as can be seen, because the number of addressing electrode is the conventional ADS driving method half, so the used time of addressing also is the conventional ADS driving method half, because the time of preparatory stage is with to keep the time ratio of phase less in each height field, even so adopted four son fields, the used time is compared with the conventional ADS driving method also not to be increased a lot, has just increased by the time of two preparatory stages.The time of preparatory stage only needs about 100 microseconds in general, and the addressing of finishing all show electrodes can be about 1000 microseconds according to the difference of different and each scanning impulse width of concrete monitor resolution, thus adopt the present invention T.T. constant situation to be issued to the number that increases son, to have reduced the minimal gray grade that can show be more effectual.Because the sub-number of fields order that uses increases, thus the minimal gray grade that can show just reduced, thereby help improving picture quality.

In order to realize the brightness identical with the conventional ADS driving method, four low weights of the present invention are total keeps the shared weight of pulse number and should keep the shared twice of keeping pulse number of cycle for corresponding two the low weights fields of conventional ADS driving method.Because the weight of these four sons also will be according to 1: 2: 4: 8 distribute, the weight allocation of four low weight fields is: (1: 2: 4: 8) * (1 * 2+2 * 2)/(1+2+4+8)=2/5: 4/5: 8/5: 16/5, and the weight of six high weight fields was kept 4: 8: 16: 32: 64: 128 constant, so the weight that pulse number is kept in each height field of the present invention need be set to: 2/5: 4/5: 8/5: 16/5: 4: 8: 16: 32: 64: 128.

Referring to Fig. 2, adjacent two row pixels are 0.4 in the resolution of the gray shade scale of four low weight fields.And the resolution of the minimal gray grade that the conventional ADS driving method can show is 1, so detail rendition ability of the present invention is 2.5 times of the conventional ADS driving method, so the present invention can be very effective to the raising meeting of picture quality when low-luminosity picture.

In traditional driving method, the data of the input of each pixel correspondence are stored through can directly storing pairing address according to sub-field data after the sub-field data conversion process.Because the present invention is converted into four figures again according to exporting after two pairing data of low weight are handled in adjacent two row, just be transformed into four sub-field data of a display line, so will increase a data transfer process by two sub-field data of original two display lines.

Referring to Fig. 3, eight bit widths input data are classified according to the son field, wherein high six bit width output datas are without data conversion, low two bit widths input data need be passed through data conversion, two input data according to adjacent two row merge to produce four bit width output datas, and this four bit widths output data and the high six bit width output datas that do not have conversion are combined into ten output data.High six is to carry out addressing and corresponding generation to keep discharge and show in all provisional capitals in these ten outputs, and low four figures is according to just carrying out addressing and show in odd-numbered frame or even frame respectively.

In order to realize such conversion, two line storages can be set in circuit, each can the storing one row data the data of two low weights, after the new data of delegation are come in, data according to front delegation two low weight field are carried out addition with the data of two low weights of new line of input, can obtain the data of each height field of sub of four low weights then by lookup table mode or mathematical operation mode.The data of these four low weight fields show in odd-numbered frame or even frame, no matter still do not change before and after data processing in the data of six high weights of even frame field in odd-numbered frame.Sub-number of fields order after the combination just is increased to 10 like this, and the minimal gray that can show also just to become be original 2.5 times.

For the ultimate principle of this driving method is described, embodiments of the invention be according to after the data processing of adjacent two row in the demonstration of adjacent odd-numbered frame and even frame, also be to have selected typical two low weight fields to handle when data processing, the son field after the processing is chosen as four sub.The thought that proposes according to the present invention when selecting adjacent row to handle, can select adjacent M capable (M=1,2,3) to handle as one group, and the data after handling simultaneously are to show in one group at adjacent M frame.Simultaneously, to the number of low weight of input data the time, can be chosen as N (N=1,2,3), and the number of handling low weight of back output can be chosen as K (K=2,3,4,5,6).M, N, K have multiple combination flexibly, specifically select anyly will determine according to the purpose of driving method and the concrete condition of enforcement.

Claims (1)

1, a kind of plasma display high picture quality driving method, at first the characteristics according to drive waveforms are divided into eight son fields in a frame, be called low weight with keeping the pulse number weight less son field that compares, be called high weight field and keep the relatively big son field of pulse number weight, it is characterized in that: in four sons employing staggered scanning of low weight, at odd field odd-numbered line is carried out staggered scanning respectively, the dual numbers row carries out staggered scanning when even field, but when showing, after the new video data of delegation is come in, the video datas that front delegation two low weight field is corresponding carry out addition with the video data of two low weights of new line of input, the summation of four sons corresponding video data of low weight equals the summation of the video data of the correspondence of adjacent two row in the input signal, obtain the video data of each height field of four low weight fields, being about to each height field keeps the weight of pulse number and is set to: 2/5: 4/5: 8/5: 16/5: 4: 8: 16: 32: 64: 128, amount to 10 sons.

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