CN1284704A - Plasma display driving device and method capable of removing dynamic error contour - Google Patents

Abstract

A plasma display driving device and method for removing dynamic error contour is disclosed, wherein the plasma display is composed of multiple display lines, the display lines are sequentially reset, scanned, and sustain-discharged to complete a sub-field display operation. A complete frame display action is composed of a plurality of sub-field display actions, and the sustain discharge time of each sub-field display action carries out sustain discharge according to a preset proportion. The method is characterized in that the display lines are divided into a plurality of display line groups alternately, and then the display line groups are subjected to sustain discharge in the sustain discharge time proportion or sequence of different subfield display operations in each complete frame display operation.

Description

Plasma to remove dynamic error profiles

Display driving device and method

The invention relates to a driving device and method of a plasma display, in particular to a driving device and method of a plasma display capable of removing dynamic error contours.

Referring to FIG. 1 , it is a schematic diagram of a driving method of a conventional plasma display. According to the driving method of the existing plasma display: a complete frame display action (Frame) is completed by multiple (taking 256-color grayscale plasma display as an example, each frame display action is completed by 8 sub-field display actions ) subfield display action (Subfield) is completed, as shown in Figure 1 SF0 ~ SF7, and each subfield display action is respectively performed by three steps of reset (Reset), scan (Scan), and sustain discharge (Sustain) Finish. In a complete frame display action, the reset step and the scan step of each subfield display action need a fixed (same) time to complete the reset and scan, and the time for the sustain discharge step is based on a predetermined ratio (such as 1: 2:4:8:16:32:64:128) to drive the plasma display to display 256 color levels.

Taking a 256-color gray-scale plasma display as an example, the duration of the sustain discharge step is positively related to the display brightness of the plasma display. Therefore, when each pixel in the plasma display is represented by 8 bits, in the frame display operation The sustain discharge operations of the eight subfield display operations can each correspond to one bit. That is, the one with the longest sustain discharge time corresponds to the highest bit; and the one with the shortest sustain discharge time corresponds to the lowest bit. As mentioned above, in a complete frame display action, the duration of the 8 sub-field display actions can be set to a ratio of 1:2:4:8:16:64:128, exactly corresponding to the 8 subfields representing pixels bit. Of course, the sustain discharge time lengths of the eight sub-field display operations can also be set to other ratios to adjust the display brightness and improve the display effect.

However, because there is a certain degree of continuity in the same area between frames and frame switching, that is, the color gradation and brightness of the previous and subsequent frames in the same area are often very close, the driving method of this plasma display may appear The phenomenon of dynamic false contour (Dynamic false contour), and abnormal continuous dark bands or continuous bright bands will appear in the area where dynamic false contours appear. For example, in the full frame display operation of a 256-color grayscale plasma display, if the sustain discharge time of the 8 subfield display operations is set to a ratio of 1:2:4:8:16:32:64:128 , when the pixel to be displayed is expressed as 127 or less and close to 127 in 8 bits, the pixel mainly emits light during the first 7 subfield display operations (sustain discharge); and when the pixel to be displayed is expressed as 128 or more in 8 bits and close to When 128, the pixel mainly emits light during the display operation period of the eighth sub-image (sustain discharge). This may lead to severe dynamic false contour phenomenon, because frames and frames often have a considerable degree of continuity between switching, when the color scale and brightness of a block to be displayed in the frame transition from below 127 (close to 127) to Above 128 (close to 128), the frame display action will have abnormal continuous dark bands. On the contrary, when the color scale and brightness of a block to be displayed in the frame transition from above 128 (close to 128) to below 127 (close to 127), abnormal continuous bright bands will appear in the frame display operation.

Figures 2A and 2B are generated when the color scale and brightness of the block to be displayed in one frame transition from below 127 to above 128, and when the color scale and brightness of the block to be displayed in one frame transition from above 128 to below 127 Schematic diagram of continuous dark band and continuous bright band. In the figure, the abscissa represents the time, that is, the continuous display frames Frame(n), Frame(n+1), _... ; those who want to display the first half of the block to be bright (white part) represent the color scale and brightness with 8 bits as Below 127 (close to 127); while the second half of the display block is illuminated, indicating that the color level and brightness are above 128 (close to 128) in 8 bits. As shown in FIG. 2A , when the color scale and brightness of the block to be displayed transition from 127 to 128, since eight dark sub-field display actions will appear continuously, a dynamic error contour will appear visually. Similarly, as shown in Figure 2B, when the color scale and brightness of the block to be displayed transition from 128 to 127, since 8 bright sub-field display actions will appear continuously, a dynamic error contour will also appear visually .

Therefore, some methods count the occurrence of dynamic error contours, and modify the sustain discharge time ratio or sequence of the 8 sub-field display actions in each complete frame display action, so as to minimize the occurrence probability of dynamic error contours. However, the effect of this approach is usually limited to certain types of display frames (pictures), but it is powerless to other types of display frames.

In order to solve the above and other problems, the main purpose of the present invention is to provide a plasma display driving device and method capable of removing dynamic error contours, which mainly divide the display lines of the plasma display into two or more groups alternately, and Changing the ratio or sequence of the sustaining discharge time in the 8 sub-field display operations to drive each group of display lines separately and avoid the phenomenon of dynamic error contours in a specific area of the frame picture together.

According to an example of the present invention, in the plasma display driving method capable of removing dynamic error contours, the plasma display is composed of a plurality of (eg: 600) display lines, and these display lines are sequentially reset, Scanning and sustaining discharges are used to complete a subfield display operation. Also, a complete frame display action is composed of multiple (e.g., 8 in a 256-color grayscale plasma display) subfield display actions, and the sustain discharge time of each subfield display action is based on a predetermined ratio A sustain discharge is performed to obtain various color gradations. The present invention is characterized in that: first, these display lines are alternately divided into a plurality of display line groups; then, in each complete frame display operation, the sustain discharge time of each subfield display operation of these display line groups is respectively set according to Sustain discharges are performed in different orders of previously predetermined ratios.

According to another example of the present invention, in the plasma display driving method capable of removing dynamic error contours, the plasma display is composed of a plurality of display lines (such as: 600), and these display lines are reset, scanned , The sustain discharge step is performed once to complete a sub-field display operation. In addition, a complete frame display operation is composed of multiple (e.g., 8 in a 256-color grayscale plasma display) subfield display operations, and the sustain discharge time of each subfield display operation is performed according to a specific ratio. Sustain discharge to obtain various color gradations. The present invention is characterized in that: first, these display lines are alternately divided into a plurality of display line groups; then, in each complete frame display operation, the sustain discharge time of each subfield display operation of these display line groups is respectively Sustaining discharges are performed at different ratios.

According to another example of the present invention, in the plasma display driving method capable of removing dynamic error contours, the plasma display is composed of a plurality of display lines (such as: 600), and these display lines are reset, scanned , The sustain discharge step is performed once to complete a sub-field display operation. Also, a complete frame display operation is composed of multiple (e.g., 8 in a 256-color grayscale plasma display) subfield display operations, and the sustain discharge time of each subfield display operation is performed according to a specific ratio. Sustain discharge to obtain various color gradations. The present invention is characterized in that: first, these display lines are alternately divided into two groups: the first display line group and the second display line group; then, in each complete frame display action, each of the first display line group The sustain discharge time of each subfield display operation is carried out at the first ratio; and in each complete frame display operation, the sustain discharge time of each subfield display operation of the second display line group is performed at the second ratio Maintain discharge.

In this plasma display driving method that can remove dynamic error contours, the sustain discharge time of each subfield display operation of the first display line group can be in the ratio of 1:2:4:8:16:32:64:128 Sustain discharge is performed; and the sustain discharge time of each sub-field display operation of the second display line group can be sustained discharge at a ratio of 128:64:32:16:8:4:2:1.

In addition, in order to achieve the above-mentioned driving method, the present invention provides a plasma display driving circuit capable of removing dynamic error contours, wherein the plasma display is composed of a plurality of display lines and is alternately divided into a first display line group and a second display line group The display lines each have a scan electrode and a sustain electrode. The driving circuit includes: a data driver, a first scan driver, a second scan driver, a first sustain driver, a second sustain driver and a timing controller. The data driver is used for receiving display data of the plasma display. The first scan driver is used to read the display data of the plasma display and output the display data of the first display line group to the scan electrodes of the first display line group according to a first selected order. The second scan driver is used to read the display data of the plasma display and output the display data of the second display line group to the scan electrodes of the second display line group according to the second selected sequence. The first sustain driver is connected to the sustain electrodes of the first display line group. The second sustain driver is connected to the sustain electrodes of the second display line group. The timing controller controls the output timing of the first scan driver, the second scan driver, the first sustain driver and the second sustain driver to drive the plasma display.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

FIG. 1 is a schematic diagram of a frame display operation of a known plasma display;

2A and 2B are schematic diagrams of the dynamic error contour phenomenon of a conventional plasma display;

Fig. 3 is the drive circuit device of plasma display of the present invention; And

4A to 4C are schematic diagrams of the dynamic false contour phenomenon of the plasma display in an embodiment of the present invention.

Since frame-to-frame switching tends to have a considerable degree of continuity in the same region, the phenomenon of dynamic false contours is practically unavoidable, as described earlier. Therefore, the present invention divides all the display lines of the plasma display into two groups (or more groups) alternately, and drives them with the sustain discharge time of the sub-field display operation in different time ratios or sequences, so as to eliminate the dynamic error contour Severe absence of phenomena in frame display.

Its approach is detailed below.

First, all display lines of the plasma display are alternately divided into two groups. Taking a gray-scale plasma display with 256 colors and a resolution of 600×800 as an example, each frame display action is composed of 8 subfield display actions, and the sustain discharge time of each subfield display action uses the scan electrodes and The input voltage of the sustain electrode controls the time scale, so that the plasma display can display 256 color levels. The predetermined ratio may be 1:2:4:8:16:32:64:128 or other special ratios designed for adjusting the display effect. In this embodiment, if all the display lines of the plasma display are divided into two groups according to the odd display lines and the even display lines, then the display lines L1, L3, ..., L599 are odd display line groups; the display lines L2, L4, ..., L600 is an even display line group. And if all the display lines of the plasma display are divided into two groups according to the mode of alternating every two display lines, then the display lines L1, L2, L5, L6, ..., L597, L98 are the first display line group; the display lines L3, L4, L7, L8, . . . , L599, L600 are the second display line group. Both of these grouping methods can achieve the effect of eliminating the phenomenon of dynamic false contours. It is worth noting that the higher the alternating frequency of all display lines of the plasma display, the better the effect of eliminating the dynamic false contour phenomenon; the lower the alternating frequency of all display lines of the plasma display, the worse the effect of eliminating the dynamic false contour phenomenon.

Of course, in this embodiment, all the display lines of the plasma display can also be divided into three or more groups (the grouping method is as above or other methods). However, for the sake of convenience, the following will only use two sets of display lines as an example to illustrate the operation of the present invention.

After all the display lines of the plasma display are divided into two groups, the two groups of display lines of the plasma display are respectively driven with two different sustain discharge time ratios or sequences of subfield display operations. For the two groups of display lines of the plasma display, the sustain discharge time ratios of the subfield display operations can be two completely different ratios, or the order of the original sustain discharge time ratios can be rearranged. Moreover, it is better not to have too high a correlation between the time ratios of the two sub-fields displaying actions, so that the effect of eliminating dynamic error contours can be strengthened. Taking the latter as an example, if the sustain discharge time ratio of the 8 sub-field display operations for driving an odd display line group (or the first display line group) is 1:2:4:8:16:32:64:128 (as previously stated ), then the sustain discharge time for driving the 8 subfield display operations of the even-numbered display line group (or the second display line group) can be adjusted to 128:64:32:16:8:4:2:1. Of course, the sustain discharge time ratios of the two groups of display lines in the eight subfield display operations of the plasma display can be arranged in various combinations, and are not limited to the above. As long as the correlation between the two ratios is reduced, the dynamic error contour when the frame is displayed can be reduced accordingly.

For example, in a grayscale plasma display with 256 colors and a resolution of 600×800, if two sets of display lines (odd display line group and even display line group, or first display line group and second display line group) The sustain discharge time in the eight sub-field display operations is respectively set to 1:2:4:8:16:32:64:128 and 128:64:32:16:8:4:2:1 according to the above content, Then when the pixel to be displayed is expressed as 127 or less and close to 127 in 8 bits, the pixels located in the odd display line group mainly emit light and display (sustain discharge) during the first 7 subfield display operations, and the pixels located in the even display line group mainly It is displayed during the last 7 subfield display operations (sustain discharge); and when the pixel to be displayed is expressed as 128 or more and close to 128 in 8 bits, the pixels located in the odd display line group are mainly displayed in the eighth sub-image During the operation period, light is emitted for display (sustain discharge), and the pixels located in the even-numbered display line group mainly emit light for display (sustain discharge) during the display operation period of the first subfield. This method can eliminate the dynamic error contour phenomenon of the same display block by means of the interlacing of continuous bright bands and continuous dark bands of each display line when the frame is displayed (because frames and frames often have a considerable degree of continuity between switching ). In this embodiment, when the color scale and brightness of a block to be displayed in the frame transition from below 127 (close to 127) to above 128 (close to 128), abnormal continuous dark bands and continuous bright bands will still appear in the frame display operation. bring. However, the sustain discharge time sequence of the sub-field display operation of each display line has been adjusted, so the generated continuous dark bands and continuous bright bands are alternately formed to reduce the degree of dynamic error contour. Conversely, when the color scale and brightness of a region to be displayed in the frame transition from above 128 (close to 128) to below 127 (close to 127), abnormal continuous dark bands and continuous bright bands will also appear in the frame display operation. However, the sustain discharge time sequence of the subfield display operation of each display line has been adjusted, so the generated continuous dark bands and continuous bright bands are also alternately formed to reduce the degree of dynamic error contour.

Figures 4A and 4B use the driving method of the present invention, the color scale and brightness of the block to be displayed in one frame transition from below 127 to above 128, and the color scale and brightness of the block to be displayed in one frame are changed from above 128 Schematic diagram of the continuous dark band and continuous bright band produced when the transition is below 127. In the figure, the abscissa represents time; the lighted part of the front part of the frame (white part) means that the color level and brightness are expressed in 8 bits below 127 (close to 127); while the lighted part of the frame means the color level and brightness are expressed in 8 bits. Above 128 (close to 128). As shown in FIG. 4A, when the color gradation and brightness of the block to be displayed transition from 127 to 128, all the display lines in the block to be displayed have been alternately driven by sustaining discharge times with two different time ratios or sequences. Therefore, the continuous occurrence of eight dark sub-field display actions occurs simultaneously in the entire block to be displayed, and the visual dynamic false contour phenomenon can be reduced. As for FIG. 4B , it is an example of dividing all the display lines of the plasma display into two groups alternately. It can be seen from the figure that the higher the alternating frequency of all display lines of the plasma display is, the better the effect of eliminating the dynamic false contour phenomenon is; the lower the alternating frequency of all display lines of the plasma display is, the worse the effect of eliminating the dynamic false contour phenomenon is. In addition, Fig. 4C is the same as Fig. 4B, and all the display lines are divided into two groups alternately every two. L1, L4, L5, L8, _... are the first group of display lines, and the display lines L2, L3, L6, L7, _... are the second group of display lines.

Referring to FIG. 3 , this is the driving circuit of the plasma display of the present invention. It is known that a plasma display PDP is composed of a plurality of display lines (such as: L1-L600), which are alternately divided into odd (first) display line groups and even (second) display line groups according to the above method. In addition, the scan operation and the sustain discharge operation of each display line are controlled by the input voltages of the scan electrodes Y1 - Y600 and the sustain electrodes X1 - X600 . In order to complete the drive method of the present invention, there are data driver 1, odd (first) scan driver 2, even (second) scan driver 3, odd (first) sustain driver 4, even (second) sustain driver in this drive circuit. Driver 5 and timing controller 6. Among them, the data driver 1 is connected to the address electrodes (such as: A1～A800) of the plasma display PDP; the odd (first) scan driver 2 is connected to the scan electrodes Y1, Y3, Y1, Y3, _... , Y599; even (second) scan driver 3 connects scan electrodes Y2, Y4, _... , Y600 of the even (second) display line group of plasma display PDP; odd (first) sustain driver 4 connects odd (first) ) sustain electrodes X1, X3, _... , X599 of the display line groups; the even (second) sustain driver 5 is connected to the sustain electrodes X2, X4, _... , X600 of the even (second) display line groups; and the timing controller 6 controls Data driver 1, odd (first) scan driver 2, even (second) scan driver 3, odd (first) sustain driver 4, and even (second) sustain driver 5 to sequentially reset the plasma display PDP , Scanning and sustaining discharge actions.

In summary, in the plasma display driving method capable of removing dynamic error contours of the present invention, all display lines are alternately divided into multiple display line groups; then, in each complete frame display action, each display line group Then sustain discharges are performed according to the sustain discharge time ratios or sequences of different sub-field display operations, so as to reduce the phenomenon of dynamic error contours.

Although the present invention has been disclosed as follows with a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. For example, the display lines of the plasma display can also be divided into three groups alternately, and are driven by sustaining discharge times of the 8 subfield display operations in different sequences or proportions. In addition, the sustain discharge time of the 8 sub-field display operations can also be adjusted to improve the dynamic error profile of the display frame. Therefore, the protection scope of the present invention should be determined by the scope defined in the claims.

Claims (7)

1. the plasma scope driving method that can remove dynamic error contour, this plasma display is made up of many display lines, discharge is then reset, scans, kept to those display lines in regular turn to finish a son display action, a complete frame display action is made up of an a plurality of son display action, then keep discharge according to a selected ratio discharge time of keeping of each son display action, to obtain multiple color range, it is characterized in that:

Those display lines are that alternate segments becomes a plurality of display line groups; And

In each complete frame display action, keep discharge according to the different order that should select ratio the discharge time of keeping of each son display action of those display line groups respectively.

2. the plasma scope driving method that can remove dynamic error contour, this plasma display is made up of many display lines, discharge step is then reset, scans, kept to those display lines once to finish a son display action, in addition, a complete frame display action is made of an a plurality of son display action, then keep discharge according to special ratios the discharge time of keeping of each son display action, to obtain multiple color range, it is characterized in that:

Those display lines are that alternate segments becomes a plurality of display line groups; And

In each complete frame display action, each son keeping of display action of those display line groups is kept discharge discharge time respectively in varing proportions.

3. as removing the plasma scope driving method of dynamic error contour as described in the claim 2, wherein, each complete frame display action is made of eight son display actions, in order to obtain 256 kinds of color ranges.

4. the plasma scope driving method that can remove dynamic error contour, this plasma display is made up of many display lines, discharge step is then reset, scans, kept to those display lines once to finish a son display action, in addition, a complete frame display action is made of an a plurality of son display action, then keep discharge according to special ratios the discharge time of keeping of each son display action, to obtain multiple color range, it is characterized in that:

Those display lines are that alternate segments becomes the first display line group and the second display line group; And

In each complete frame display action, be to keep discharge with first ratio discharge time of keeping of each son display action of this first display line group, and in each complete frame display action, then be to keep discharge with second ratio discharge time of keeping of each son display action of this second display line group.

5. as removing the plasma scope driving method of dynamic error contour as described in the claim 4, wherein, each complete frame display action is made of eight son display actions, in order to obtain 256 kinds of color ranges.

6. as removing the plasma scope driving method of dynamic error contour as described in the claim 5, wherein, in each complete frame display action, be with 1: 2: 4 the discharge time of keeping of each son display action of this first display line group: 8: 16: 32: 64: 128 ratio was kept discharge; And in each complete frame display action, then be with 128: 64: 32 the discharge time of keeping of each son display action of this second display line group: 16: 8: 4: 2: 1 ratio was kept discharge.

7. the plasma display drive device that can remove dynamic error contour, wherein, this plasma display is made up of many display lines and alternate segments becomes the first display line group and the second display line group, those display lines then respectively have one scan electrode, and keep electrode and a plurality of addressing-electrode, and described device comprises:

One data driver connects the addressing-electrode of this plasma display;

First scanner driver connects the scan electrode of the first display line group of this plasma display;

Second scanner driver connects the scan electrode of the first display line group of this plasma display;

First keeps driver, connects the electrode of keeping of this first display line group;

Second keeps driver, connects the electrode of keeping of this second display line group; And

Time schedule controller is controlled this first scanner driver, this second scanner driver, this first is kept driver and this second and keep driver and keep discharging action with the replacement, the scanner uni that carry out this plasma display in regular turn.

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