KR100523861B1 - Driving Method of Plasma Display - Google Patents

Abstract

The present invention divides and drives the scan electrodes into an arbitrary number of blocks, but differentiates the scanning order in each block for each block, or changes the corresponding block for supplying the random scan pulse in the driving pulse at regular intervals to improve image quality. It relates to a method of driving a device.

To this end, the present invention divides one frame into first to eighth subfields SF1 to SF8 to implement 2 ^X gray scales, and then blocks the horizontal electrode lines S1 to S480 into an arbitrary number of blocks to divide and drive the screen. When the scan pulses are supplied to the horizontal electrode lines S1 to S480, the scanning order of the electrode lines in each block is differentiated for each block to provide temporal continuity among the blocks, or the random scan pulses in the driving pulses may be generated. When supplied to a plurality of blocks of the horizontal electrode lines S1 to S480, the blocks are not fixed to one block but are changed every predetermined period.

Description

Driving Method of Plasma Display

The present invention relates to a method of driving a plasma display device, and in particular, by dividing and driving a scan electrode into an arbitrary number of blocks, for each block, a block corresponding to differentiating the scanning order in a block or supplying an arbitrary scan pulse in a driving pulse is fixed. The present invention relates to a method of driving a plasma display device in which the image quality is improved by changing every cycle.

As is well known, a plasma display device refers to a flat display device including a plasma display panel which is a light emitting device and displaying a moving image or a still image by using a gas discharge phenomenon inside the plasma display panel.

In the plasma display panel, a plurality of first and second sustain electrode lines and address electrode lines are formed on upper and lower glass substrates, respectively, and the entire screen is divided into a plurality of cells by each electrode line. The image is displayed by the address discharge and the sustain discharge which occur selectively at.

Here, the address discharge refers to the discharge between the address electrode and the sustain electrode, the sustain discharge refers to the discharge between the first and second sustain electrodes, and the sustain discharge serves to maintain the address discharge.

FIG. 1 is a block diagram of a typical divisional driving plasma display device, and includes 640 R (Red), G (Green), and B (Blue) address electrode lines R1, G1, B1, ..., R640, G640, and B640. PDP 10 having a vertical electrode line) and 480 first and second sustain electrode line pairs (S1, S2, ..., S479, S480, hereinafter referred to as horizontal electrode lines); R, G, B image data is digitized to output 8-bit R, G, B digital image data (256 gray scales are implemented), and various controls required for driving the PDP 10 according to the digital image data and external signals The microcomputer 20 for outputting a signal and the horizontal electrode lines S1 to S480 are divided into a plurality of blocks (first to N blocks) having the same ratio, and scan pulses are detected for each block according to previously stored address data. After supplying and scanning, a sustain pulse is applied to all horizontal electrode lines (S1 to S480). Scanning and sustain driver 30 to maintain discharge and light emission of each cell, and a memory unit 40 to store R, G, and B digital image data output from the microcomputer 20 for each frame, color, and bit. And 640 R, G, B bit values of 640 R, G, B digital image data corresponding to the horizontal electrode lines scanned by the scanning and sustain driver 30 are read from the memory unit 40, and 640 R, G, It consists of the address drive part 50 supplied to B vertical electrode lines R1-B640.

The PDP 10 orthogonally intersects each of the horizontal electrode lines S1 to S480 on 480 horizontal electrode lines S1 to S480 arranged on the front substrate, and a rear substrate disposed parallel to the front substrate with a predetermined distance therebetween. It consists of 640 R, G, and B vertical electrode lines R1 to B640 arranged so as to form a full screen (the entire screen is composed of 640 × 480 pixels (pixel, R, G, B cells) in a matrix form).

The scanning and sustain driver 30 divides the horizontal electrode lines S1 to S480 into first to N blocks having the same ratio, and stores selection order information for each block according to the control signal of the microcomputer 20. The driving ICs (Integrated Circuits) 33a to the rear stages are output in accordance with the horizontal electrode line address ROM 34 outputted in the order, the control signal of the microcomputer 20 and the electrode line selection information of the horizontal electrode line address ROM 34. 33d) The clock and data generator 31 generating and outputting the clock signal CLK including the initialization signal, the data signal D _O , and the horizontal electrode line selection signal, and the sustain signal according to the control signal of the microcomputer 20. The clock signal CLK and the data signal in a state in which the sustain pulse generator 32 for generating and outputting a pulse and the horizontal electrode lines S1 to S480 are divided and connected to the first to N blocks having the same ratio. D _O ) and the number First to fourth driving ICs 33a to 33d that simultaneously supply scan pulses to the blocks of the horizontal electrode lines S1 to S480 in time order according to the flat electrode line selection signal and the sustain pulses. It consists of.

Referring to the frame structure shown in FIG. 3, a process of implementing 256 gray levels on the panel according to the 4-divided sub-field driving method by the driving waveform shown in FIG. 2 will be described below. same.

First, in order to realize 256 (2 ^X ) gradation, one frame screen is divided into 8 (Y) subfield screens, and the externally input image data is digitized into 8 (X) bit digital image data to each subfield. Supply the horizontal electrode lines S1 to S480 to the first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480, which are equal to four scan pulses included in one period of the driving pulse. Drive by dividing (where X ≤ Y)

The reset period and the address period of the reset period, the address period, and the sustain period constituting each subfield screen are equally assigned to each subfield, but the sustain period is different depending on the bit weight of the digital image data displayed in the address period. By assigning each of the subfields (using the integration effect of the eyes), 256 gray levels are realized.

That is, as shown in FIG. 3, after dividing a frame into eight subfields SF1 to SF8, luminance values proportional to 1: 2: 8: 16: 32: 64: 128 are obtained for each subfield. Correspondingly, images corresponding to grayscale data 0 to 255 are displayed in a combination of several subfields.

Therefore, the microcomputer 20 digitizes R, G, and B image data externally input to implement 256 gray levels, and converts 8-bit R, G, and B digital image data (lowest bit value B1 to most significant bit value B8). And various control signals required for driving the PDP 10 in accordance with the digital image data and the external signal.

At this time, the 8-bit R, G, B digital image data output from the microcomputer 20 is stored in the memory unit 40 by frame, color, and bit.

Thereafter, in the reset period and the address period of the first to eighth subfield screens SF1 to SF8, the first to fourth driving ICs 33a to 33d are moved to the previous horizontal electrode lines S1 to S480 in one step. Erase pulses to remove wall charges generated in the second stage; write pulses to form even wall charges throughout the PDP 10 in two stages; and erase pulses in three stages to supply 640 R, G, and B vertical electrode lines (R1~B640) above, and so the address pulse voltage to be supplied to the subsequent low to form the wall charges, a clock signal (CLK) and a data signal (D _O) and a driving IC to step (33a~33d) The horizontal electrode lines S1 to S480 are selected in accordance with the selection signal, the sustain pulse and the electrode line selection information stored in the horizontal electrode line address ROM 34 to supply scan pulses one line at a time.

In more detail, the four-step scanning pulse supply process will be described in detail. In accordance with the control signal of the microcomputer 20, the horizontal electrode line address ROM 34 of the scanning and sustain driver 30 is transferred to the clock and data generator 31. The horizontal electrode line selection information is output. According to the selection information, the PDP 10 is driven to be divided into first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480.

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S121 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S241 lines of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is outputted so as to be supplied to the S361 line (S480).

The pulse a of the second period outputs the selection information to be supplied to the S2 line of the first blocks S1 to S120, and the pulse b outputs the selection information to be supplied to the S122 line of the second blocks S121 to S240. The pulse c outputs the selection information to be supplied to the S242 line of the third block S241 to S360, and the pulse d outputs the selection information to be supplied to the S362 line of the fourth block S361 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Then, the clock and data generator 31 generates and outputs the horizontal electrode line selection signal in accordance with the electrode line selection information, and at the same time, the clock signal CLK and the data signal D _O in accordance with the control signal of the microcomputer 20. To generate the output.

At this time, the sustain pulse generator 32 generates and outputs a line erase pulse and a sustain pulse according to the control signal of the microcomputer 20.

Then, the first to fourth driving ICs 33a to 33b that have received the line erase pulse through the sustain pulse generator 32 have any horizontal electrode line or a plurality of horizontal lines in a predetermined subfield so that the gray scale changes linearly. A line erase pulse is supplied to the electrode line so that all the cells of the electrode line are erase discharged.

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

In this case, the order in which the scan pulses are supplied to the horizontal electrode lines S1 to S480 is shown in Table 1 below.

TABLE 1

 Scan pulse  1st term  2nd term  3rd term     … 120th period    Pulsea      One      2      3     …    120    Pulse b    121    122    123     …    240    Pulsec    241    242    243     …    360    Pulse d    361    362    363     …    480

In addition, when supplying the scan pulses in the four steps, the address driver 50 may transmit address pulses (1 bit value of R, G, and B digital image data) corresponding to the horizontal electrode lines to which the scan pulses are supplied and scanned. Synchronization is supplied to 640 R, G, and B vertical electrode lines R1 to B640, respectively, so that a discharge occurs in the discharge space of each cell supplied with a logic " high "

At this time, the address driver 50 converts 8-bit R, G, and B digital image data B1 to B8 corresponding to each cell from B1 to SF1, B2 to SF2,... It is supplied to B7 → SF7 and B8 → SF8 respectively.

On the other hand, when the address period of each of the subfield screens SF1 to SF8 is completed, the first to fourth driving ICs 33a to 33b receive the sustain pulse from the sustain pulse generator 32 and then use the entire horizontal electrode lines S1 to S480. ) SF1: SF2:… SF7: SF8 = 2 ⁰ : 2 ¹ :... A number of sustain pulses proportional to 2 ⁶ : 2 ⁷ (luminance relative ratio) is supplied so that the discharge and light emission of some cells in which the discharge occurs in the address period are maintained for the period (sustain period) in which the sustain pulse is supplied.

When the configuration of the first to eighth subfield screens SF1 to SF8 is completed through the above process, 256 gray scale images are displayed on the PDP 10.

FIG. 4 is a frame structure diagram illustrating a process of implementing 256 gray levels on a panel by the divided driving plasma display device illustrated in FIG. 1 according to a two-division subfield driving method based on the driving waveform shown in FIG. 2.

The two-segment subfield driving method is not significantly different from the driving principle of the four-segment subfield driving method described above. However, in order to realize 256 (2 ^X ) gradation, one frame screen is divided into eight (Y) subfield screens, The image data input from the digital signal is digitized into 8 (X) bits of digital image data and supplied to each subfield, and the horizontal electrode lines S1 to S480 are one-half of the number of scan pulses included in one period of the driving pulse. The drive is divided into one block (S1 to S240) and second block (S241 to S480).

In this case, the process of supplying the scan pulses of the first blocks S1 to S240 and the second blocks S241 to S480 will be described in detail. According to the control signal of the microcomputer 20, the horizontal electrodes of the scanning and sustain driving unit 30 will be described. The line address ROM 34 outputs horizontal electrode line selection information to the clock and data generator 31, and the PDP 10 is driven in two blocks S1 to S240 and S241 to S480 according to the selection information. .

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S240 in the drive pulse shown in FIG. The selection information is output to be supplied to the S241 lines of the two blocks S241 to S480, the pulse c outputs the selection information to be supplied to the S2 lines of the first blocks S1 to S240, and the pulse d is the second block S241. The selection information is outputted so as to be supplied to the S242 line of S480.

The pulse a of the second period outputs the selection information to be supplied to the S3 line of the first blocks S1 to S240, and the pulse b outputs the selection information to be supplied to the S243 line of the second blocks S241 to S480. The pulse c outputs selection information to be supplied to the S4 line of the first blocks S1 to S240, and the pulse d outputs selection information to be supplied to the S244 line of the second blocks S241 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Therefore, the positions of the scan pulses supplied to the horizontal electrode lines S1 to S480 are as shown in Table 2 below.

TABLE 2

 Scan pulse  1st term  2nd term  3rd term     … 60th period    Pulsea      One      3      5     …    239    Pulse b    241    243    245     …    479    Pulsec      2      4      6     …    240    Pulse d    242    244    246     …    480

In addition, when the scan pulse is supplied, the address driver 50 synchronizes the address pulse corresponding to the horizontal electrode line to which the scan pulse is supplied and scanned to the 640 R, G, and B vertical electrode lines R1 to B640 in synchronization with the scan signal. Each supply causes discharge within the discharge space of each cell to which a logic "high" is supplied by the address pulse, and through this process, the configuration of the first to eighth subfield screens SF1 to SF8 is completed. In this case, 256 gray scale images are displayed on the PDP 10.

However, according to the conventional method of driving a 4-division or 2-division plasma display device as described above, as shown in the frame structure diagrams of FIGS. 3 and 4, the discharge between blocks is unstable due to the scan discontinuity between the blocks. In addition, there was a problem in that the image quality between blocks is uneven.

For example, the reason why the quality of the blocks appear unevenly is taken as an example of the four-division driving method. In the driving pulse shown in FIG. 2, pulse a drives only the first blocks S1 to S120, and pulse b drives only the second block. In addition, as the pulse c drives only the third blocks S241 to S360 and the pulse d drives only the fourth blocks S361 to S480, the image quality of the image implemented in the PDP is different for each block.

This is because the pulse a is located closer to the sustain period in time than the other pulses, so that the discharge is stronger, so that the first blocks S1 to S120 driven by the pulse a appear darkest.

In other words, the amount and distribution of wall charges generated by the write pulses vary according to the temporal positional difference of the scan pulses, resulting in a difference in fine image quality, which is gathered in one screen block, resulting in uneven image quality between blocks.

Accordingly, the present invention has been proposed to solve the above-mentioned problems of the prior art, and the scan electrode is divided into a predetermined number of blocks, but the corresponding to differentiate the scan order in the block for each block or supply a random scan pulse in the drive pulse SUMMARY OF THE INVENTION An object of the present invention is to provide a method of driving a plasma display device in which an image quality is improved by changing blocks at regular intervals.

The technical means of the present invention for achieving this purpose is to divide the horizontal electrode line into first to N blocks after dividing one frame into specific sub-fields for the purpose of realizing a predetermined gradation, which is included in the driving pulse. When the scan pulse is supplied to the horizontal electrode line, the horizontal electrode line scanning order in the predetermined block among the first to N blocks is performed in the reverse order, and the horizontal electrode line scanning order in the specific block adjacent to the predetermined block is performed in the reverse order to identify the predetermined block and the specific block. The scanning order between the blocks is characterized by having a temporal continuity.

In addition, after dividing one frame into specific sub-fields to implement a predetermined gray scale, the horizontal electrode line is divided into first to N blocks to divide the screen, and a predetermined period is provided when supplying an arbitrary scan pulse in the driving pulse to the horizontal electrode line. Each of the first to N blocks is characterized in that the corresponding block is changed.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a diagram illustrating a frame structure according to a method of driving a plasma display device according to a first embodiment of the present invention. In order to implement 256 ( ^2X ) gradations, one frame includes first to eighth subfields (first to Y). The first to fourth (N) blocks S1 to S120 and S121 to S240 having the same number as the scan pulses included in one period of the driving pulse after dividing the subfields SF1 to SF8 into the horizontal electrode lines S1 to S480. When the screen is divided into S241 to S360 and S361 to S480, the screen is divided and the scan pulses are supplied to the horizontal electrode lines S1 to S480. In addition, the scanning order of the specific blocks (first and third blocks) adjacent to the predetermined block is performed in the reverse order, that is, the scanning order of the first blocks S1 to S120 is sequentially scanned from the S120 horizontal electrode line, and the second block ( The scanning order of S121 to S240 is sequentially performed from the S121 horizontal electrode line. The scanning order of the third blocks S241 to S360 is sequentially scanned from the S360 horizontal electrode line, and the scanning order of the fourth blocks S361 to S480 is sequentially scanned from the S361 horizontal electrode line. Where X ≤ Y)

According to the driving method according to the first exemplary embodiment of the present invention as described above, a process of supplying a scan pulse by selecting a horizontal electrode line among displaying 256 grayscale images on a PDP screen is illustrated. A description with reference to FIG. 5 is as follows.

First, the horizontal electrode line address ROM 34 of the scanning and sustain driver 30 outputs the horizontal electrode line selection information to the clock and data generator 31 according to the control signal of the microcomputer 20. The PDP 10 is driven to be divided into first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480.

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S120 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S121 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S360 line of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is outputted so as to be supplied to the S361 line (S480).

The pulse a of the second period outputs the selection information to be supplied to the S119 line of the first blocks S1 to S120, and the pulse b outputs the selection information to be supplied to the S122 line of the second blocks S121 to S240. The pulse c outputs selection information to be supplied to the S359 lines of the third blocks S241 to S360, and the pulse d outputs selection information to be supplied to the S362 lines of the fourth blocks S361 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Next, the clock and data generator 31 generates and outputs a horizontal electrode line selection signal according to the electrode line selection information, and at the same time, the clock signal CLK and the data signal D according to the control signal of the microcomputer 20. Generate and print _O ).

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

At this time, the order in which the scan pulses are supplied to the horizontal electrode lines S1 to S480 is shown in Table 3 below.

TABLE 3

 Scan pulse  1st term  2nd term  3rd term     … 120th period    Pulsea    120    119    118     …      One    Pulse b    121    122    123     …    240    Pulsec    360    259    258     …    241    Pulse d    361    362    363     …    480

Therefore, the scanning order of the electrode lines in each block is sequentially performed to achieve temporal continuity, and the scanning order of two adjacent horizontal electrode lines S120 and S121, S240 and S241, S360 and S361 between blocks is also temporal. Will have

FIG. 6 is a diagram illustrating a frame structure according to a two-division driving method of the plasma display device according to the second embodiment of the present invention, which is derived from the first embodiment, wherein one period of driving pulses is applied to the horizontal electrode lines S1 to S480. When the screen is divided into first to second blocks S1 to S240 and S241 to S480, which is 1/2 of the number of scan pulses included in the circuit, the screen is divided and driven, but the scan pulse is supplied to the horizontal electrode lines S1 to S480. The scanning order of blocks (second block) is performed in the reverse order, and the scanning order of specific blocks (first block) adjacent to the predetermined block is performed in the reverse order.

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S240 line of the first blocks S1 to S240 in the driving pulse shown in FIG. The selection information is output to be supplied to the S241 lines of the two blocks S241 to S480, the pulse c outputs the selection information to be supplied to the S239 lines of the first blocks S1 to S240, and the pulse d is the second block S241. The selection information is outputted so as to be supplied to the S242 line of S480.

The pulse a of the second period outputs the selection information to be supplied to the S238 lines of the first blocks S1 to S240, and the pulse b outputs the selection information to be supplied to the S243 lines of the second blocks S241 to S480. The pulse c outputs the selection information to be supplied to the S237 lines of the first blocks S1 to S240, and the pulse d outputs the selection information to be supplied to the S244 lines of the second blocks S241 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Therefore, the positions of the scan pulses supplied to the horizontal electrode lines S1 to S480 are as shown in Table 4 below.

TABLE 4

 Scan pulse  1st term  2nd term  3rd term     … 60th period    Pulsea    240    238    236     …      2    Pulse b    241    243    245     …    479    Pulsec    239    237    235     …      One    Pulse d    242    244    246     …    480

However, as described above, a method of supplying pulses a and pulse c to the second block and supplying pulses b and pulse d to the second block among the four pulses included in one period of the driving pulse is impossible in the embodiment. The pulse a and the pulse b are supplied to the first block and the pulse c and the pulse d are supplied to the second block.

FIG. 7 is a diagram illustrating a frame structure according to a driving method of a plasma display device according to a third embodiment of the present invention. The horizontal electrode line S1 is identical to the driving method according to the first embodiment of the present invention shown in FIG. 5. -S480 is divided into first to fourth (N) blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480, which are equal to the number of scan pulses included in one period of the driving pulse, thereby splitting the screen. However, when the scan pulse is supplied to the horizontal electrode lines S1 to S480, the scan order of the first and third blocks is performed in the reverse order, and the scan order of the second and fourth blocks is performed in the reverse order, that is, the first block S1. The scanning order of ˜S120 is sequentially scanned from the S1 horizontal electrode line, and the scanning order of the second blocks S121 ˜ S240 is sequentially scanned from the S240 horizontal electrode line, and the scanning order of the third blocks S241 ˜ S360 is performed. Scan sequentially from the S241 horizontal electrode line The scanning order of the fourth blocks S361 to S480 is sequentially performed from the S480 horizontal electrode line.

According to the driving method according to the third embodiment of the present invention as described above, a process of supplying scan pulses by selecting horizontal electrode lines from displaying 256 grayscale images on a PDP screen is shown in FIGS. 1 and 2. A description with reference to FIG. 7 is as follows.

First, the horizontal electrode line address ROM 34 of the scanning and sustain driver 30 outputs the horizontal electrode line selection information to the clock and data generator 31 according to the control signal of the microcomputer 20. The PDP 10 is driven to be divided into first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480.

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S240 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S241 line of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is output so as to be supplied to the S480 line (S480).

The pulse a of the second period outputs the selection information to be supplied to the S2 line of the first blocks S1 to S120, and the pulse b outputs the selection information to be supplied to the S239 line of the second blocks S121 to S240. Pulse c outputs selection information to be supplied to line S242 of third blocks S241 to S360, and pulse d outputs selection information to be supplied to line S479 of fourth blocks S361 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Then, the clock and data generator 31 generates and outputs the horizontal electrode line selection signal in accordance with the electrode line selection information, and at the same time, the clock signal CLK and the data signal D _O in accordance with the control signal of the microcomputer 20. To generate the output.

At this time, the sustain pulse generator 32 generates and outputs a line erase pulse and a sustain pulse according to the control signal of the microcomputer 20.

Then, the first to fourth driving ICs 33a to 33b that have received the line erase pulse through the sustain pulse generator 32 have any horizontal electrode line or a plurality of horizontal lines in a predetermined subfield so that the gray scale changes linearly. A line erase pulse is supplied to the electrode line so that all the cells of the electrode line are erase discharged.

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

In this case, the order in which the scan pulses are supplied to the horizontal electrode lines S1 to S480 is shown in Table 5 below.

TABLE 5

 Scan pulse  1st term  2nd term  3rd term     … 120th period    Pulsea      One      2      3     …    120    Pulse b    240    239    238     …    121    Pulsec    241    242    243     …    360    Pulse d    480    479    478     …    361

Therefore, as in the first embodiment of the present invention shown in FIG. 4, the electrode line scanning order in each block is sequentially performed to have time continuity, and two adjacent horizontal electrode lines S120 and S121 between blocks. , S240 and S241 and S360 and S361) also have temporal continuity.

FIG. 8 is a diagram showing a frame structure according to a two-division driving method of the plasma display device according to the fourth embodiment of the present invention, which is derived from the third embodiment, wherein one period of driving pulses is applied to the horizontal electrode lines S1 to S480. When the screen is divided into first to second blocks S1 to S240 and S241 to S480, which is 1/2 of the number of scan pulses included in the block, the screen is divided and driven, and the scan pulse is supplied to the horizontal electrode lines S1 to S480. The scanning order of one block is performed in the reverse order, and the scanning order of the second block is performed in the reverse order.

That is, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S240 in the drive pulse shown in FIG. The selection information is output to be supplied to the S480 lines of the two blocks S241 to S480, the pulse c outputs the selection information to be supplied to the S2 lines of the first blocks S1 to S240, and the pulse d is the second block S241. The selection information is outputted so as to be supplied to the S479 line of S480.

The pulse a of the second period outputs the selection information to be supplied to the S3 line of the first blocks S1 to S240, and the pulse b outputs the selection information to be supplied to the S478 line of the second blocks S241 to S480. The pulse c outputs selection information to be supplied to the S4 line of the first blocks S1 to S240, and the pulse d outputs selection information to be supplied to the S477 line of the second blocks S241 to S480. By the method, horizontal electrode line selection information is output so that a screen is dividedly driven by blocks in every subfield.

Therefore, the positions of the scan pulses supplied to the horizontal electrode lines S1 to S480 are as shown in Table 6 below.

TABLE 6

 Scan pulse  1st term  2nd term  3rd term     … 60th period    Pulsea      One      3      5     …    239    Pulse b    480    478    476     …    242    Pulsec      2      4      6     …    240    Pulse d    479    477    475     …    241

However, as described above in the description of the second embodiment, among the four pulses included in one period of the driving pulse, the pulses a and c are supplied to the first block, and the pulses b and d are supplied to the second block. Since is not possible in the embodiment, the pulse a and the pulse b are supplied to the first block and the pulse c and the pulse d are supplied to the second block.

Meanwhile, according to the first to fourth embodiments of the present invention, the selection order for each block in which the horizontal electrode lines S1 to S480 are divided into a plurality of blocks having the same ratio is shown in the block diagram of FIG. 1. This is implemented by changing the data map of the horizontal electrode line address ROM 34 which stores the information and outputs the electrode line selection information in a chronological order in accordance with the control signal of the microcomputer 20.

Therefore, various embodiments may be implemented according to the change of the data map stored in the horizontal electrode line address ROM 34, and the horizontal electrode for implementing the method of driving the plasma display device according to the fifth embodiment of the present invention. The data map of the line address ROM 34 is shown in Table 7 below.

However, in Table 7, m is the total number of horizontal electrode lines, and n is the number of blocks (= number of scan pulses included in one driving pulse cycle) of horizontal electrode lines divided by the same ratio.

The plasma display device having the horizontal electrode line address ROM storing the memory map shown in Table 7 receives the driving waveform shown in FIG. 2, and divides the PDP screen into four sections to select the horizontal electrode line. The process of supplying the scan pulse will now be described with reference to the frame structure diagram shown in FIG. 3.

According to the fourth division driving method according to the fifth embodiment of the present invention, the horizontal electrode line address ROM 34 of the scanning and sustain driving unit 30 according to the control signal of the microcomputer 20 is the same as the first and third embodiments described above. When the horizontal electrode line selection information is outputted to the clock and data generator 31, the PDP 10 generates first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480 according to the selection information. Is divided into driving.

TABLE 7

  ROM Address           ROM Data        One  S1 scan electrode selection        2  S (m / n) +1 scan electrode selection        …             …        n  S ((n-1) m / n) +1 scan electrode selection       n + 1  S ((n-1) m / n) +2 scan electrode selection       n + 2  S2 scan electrode selection       …             …       2n  S ((n-2) m / n) +2 scan electrode selection       2n + 1  S ((n-2) m / n) +3 scan electrode selection       2n + 2  S ((n-1) m / n) +3 scan electrode selection       …             …       3n  S (m / n) +3 scan electrode selection       …             …   ((n-1) m / n) +1  S (n-2) m / n scan electrode selection   ((n-1) m / n) +2  S (n-1) m / n scan electrode selection       …             …     m (= nm / n)  S (m / n) +1 scan electrode selection

However, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S121 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S241 lines of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is outputted so as to be supplied to the S361 line (S480).

The pulse a in the second period outputs the selection information to be supplied to the S362 line of the fourth blocks S361 to S480, and the pulse b outputs the selection information to be supplied to the S2 line of the first blocks S1 to S120. The pulse c outputs selection information to be supplied to the S122 lines of the second blocks S121 to S240, and the pulse d outputs selection information to be supplied to the S242 lines of the third blocks S241 to S360.

In addition, in this manner, the pulse a outputs selection information to be supplied to the S240 lines of the second blocks S121 to S240 in the 120th period (not shown) in order to divide the screen into blocks for each subfield. , Pulse b outputs selection information to be supplied to line S360 of the third blocks S241 to S360, pulse c outputs selection information to be supplied to line S480 of the fourth blocks S361 to S480, and pulse d Selection information is output to be supplied to the S120 line of the first blocks S1 to S120.

Then, the clock and data generator 31 generates and outputs the horizontal electrode line selection signal in accordance with the electrode line selection information, and at the same time, the clock signal CLK and the data signal D _O in accordance with the control signal of the microcomputer 20. To generate the output.

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

In this case, the order in which the scan pulses are supplied to the horizontal electrode lines S1 to S480 is shown in Table 8 below.

TABLE 8

 Scan pulse  1st term  2nd term  3rd term     … 120th period    Pulsea      One    362    243     …    240    Pulse b    121      2    363     …    360    Pulsec    241    122      3     …    480    Pulse d    361    242    123     …    120

Therefore, each pulse (pulse a, pulse b, pulse c, pulse d) included in one period (period) of the drive pulse shown in FIG. 2 is a plurality of blocks of the horizontal electrode lines S1 to S480, that is, the first one. When supplied to the fourth to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480, the block is changed and supplied at a predetermined period, that is, every period of the driving pulse, without being fixed to one block.

However, in the above-described fifth embodiment, the predetermined period in which the supply block of the arbitrary pulse is changed among the driving pulses is determined as every cycle of the driving pulses, but this is not possible in the embodiment, and thus one cycle of the driving pulses or a predetermined multiple of the driving pulse periods. The period or frame period may be changed.

On the other hand, when the electrode line selection information of the data map stored in the horizontal electrode line address ROM 34 is changed, the first to fifth embodiments of the present invention are implemented. Therefore, when the data map shown in Table 7 is slightly changed, the first embodiment is implemented. It is possible to implement a driving method (sixth embodiment of the present invention) in which the example and fifth embodiments are combined, and a driving method (seventh embodiment of the present invention) in which the third and fifth embodiments are combined.

In Table 9 below, when the number of total horizontal electrode lines is 480 and the number of scan pulses included in one driving pulse is four, the horizontal for implementing the sixth embodiment of the present invention in which the first and fifth embodiments are combined The data map of the electrode line address ROM 34 is shown.

TABLE 9

 ROM Address       ROM Data       One   S120 scan electrode selection       2   S121 Scanning Electrode Selection       3   S360 Scanning Electrode Selection       4   S361 Scanning Electrode Selection       5   S362 scan electrode selection       6   S119 scan electrode selection       7   S122 Scanning Electrode Selection       8   S359 Scanning Electrode Selection       9   S358 Scanning Electrode Selection       10   S363 Scanning Electrode Selection       11   S338 scan electrode selection       12   S123 scan electrode selection       …           …      477   S240 scan electrode selection      478   S241 scan electrode selection      479   S480 scan electrode selection      480   S1 scan electrode selection

The plasma display device having the horizontal electrode line address ROM storing the memory map shown in Table 9 receives the driving waveform shown in FIG. 2 and divides the PDP screen into four to display 256 grayscale images. The process of supplying the scan pulse will now be described with reference to the frame structure diagram shown in FIG. 5.

The driving method according to the sixth embodiment of the present invention is the horizontal electrode line address ROM 34 of the scanning and sustain driver 30 according to the control signal of the microcomputer 20 as in the first, third and fifth embodiments described above. When the horizontal electrode line selection information is outputted to the clock and data generator 31, the PDP 10 generates the first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480 according to the selection information. Is divided into driving.

However, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S120 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S121 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S360 line of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is outputted so as to be supplied to the S361 line (S480).

The pulse a of the second period outputs the selection information to be supplied to the S362 line of the fourth blocks S361 to S480, and the pulse b outputs the selection information to be supplied to the S119 line of the first blocks S1 to S120. The pulse c outputs selection information to be supplied to the S122 lines of the second blocks S121 to S240, and the pulse d outputs selection information to be supplied to the S359 lines of the third blocks S241 to S360.

In addition, in this manner, the pulse a outputs selection information to be supplied to the S240 lines of the second blocks S121 to S240 in the 120th period (not shown) in order to divide the screen into blocks for each subfield. , Pulse b outputs selection information to be supplied to line S241 of the third block (S241 to S360), pulse c outputs selection information to be supplied to line S480 of the fourth block (S361 to S480), and pulse d is Selection information is output so as to be supplied to the S1 line of the first blocks S1 to S120.

Then, the clock and data generator 31 generates and outputs the horizontal electrode line selection signal in accordance with the electrode line selection information, and at the same time, the clock signal CLK and the data signal D _O in accordance with the control signal of the microcomputer 20. To generate the output.

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

Accordingly, in the sixth embodiment of the present invention, the scanning order of the electrode lines in each block is sequentially performed to achieve temporal continuity, and the two adjacent horizontal electrode lines S120 and S121, S240 and S241, The scanning order of S360 and S361 also has a temporal continuity, and each pulse (pulse a, pulse b, pulse c, pulse d) included in one period (period) of the driving pulse is connected to the horizontal electrode lines S1 to S480. When supplied to a plurality of blocks, that is, the first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480, the block is changed and supplied every cycle of the driving pulse without being fixed to one block. do.

In Table 10 below, when the number of total horizontal electrode lines is 480 and the number of scan pulses included in one driving pulse is four, the horizontal for implementing the seventh embodiment of the present invention, in which the third and fifth embodiments are combined The data map of the electrode line address ROM 34 is shown.

The plasma display device having the horizontal electrode line address ROM storing the memory map shown in Table 10 receives the driving waveform shown in FIG. 2 and divides the PDP screen into four segments to display 256 gray scale images. A process of supplying a scan pulse will be described with reference to the frame structure diagram shown in FIG. 5.

TABLE 10

 ROM Address       ROM Data       One   S1 scan electrode selection       2   S240 scan electrode selection       3   S241 scan electrode selection       4   S480 scan electrode selection       5   S479 Scanning Electrode Selection       6   S2 scan electrode selection       7   S239 scan electrode selection       8   S242 scan electrode selection       9   S243 scan electrode selection       10   S478 scan electrode selection       11   S3 scan electrode selection       12   S238 Scanning Electrode Selection       …           …      477   S121 Scanning Electrode Selection      478   S360 Scanning Electrode Selection      479   S361 Scanning Electrode Selection      480   S120 scan electrode selection

In the driving method according to the seventh embodiment of the present invention, the horizontal electrode line address ROM 34 of the scanning and sustain driver 30 generates clock and data in accordance with the control signal of the microcomputer 20 as in the above-described other embodiment. When the horizontal electrode line selection information is outputted to the unit 31, the PDP 10 is divided into the first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480 according to the selection information.

However, the horizontal electrode line address ROM 34 outputs selection information such that the pulse a of the first period is supplied to the S1 line of the first blocks S1 to S120 in the drive pulse shown in FIG. The selection information is output to be supplied to the S240 lines of the two blocks S121 to S240, the pulse c outputs the selection information to be supplied to the S241 line of the third blocks S241 to S360, and the pulse d is the fourth block S361. The selection information is output so as to be supplied to the S480 line (S480).

The pulse a in the second period outputs the selection information to be supplied to the S479 lines of the fourth blocks S361 to S480, and the pulse b outputs the selection information to be supplied to the S2 lines of the first blocks S1 to S120. The pulse c outputs selection information to be supplied to the S239 line of the second blocks S121 to S240, and the pulse d outputs selection information to be supplied to the S242 line of the third blocks S241 to S360.

In addition, in this manner, the pulse a outputs selection information to be supplied to the S121 lines of the second blocks S121 to S240 in the 120th period (not shown) in order to divide the screen into blocks for each subfield. , Pulse b outputs selection information to be supplied to line S360 of the third blocks S241 to S360, pulse c outputs selection information to be supplied to line S361 of the fourth blocks S361 to S480, and pulse d is Selection information is output to be supplied to the S120 line of the first blocks S1 to S120.

Then, the clock and data generator 31 generates and outputs the horizontal electrode line selection signal in accordance with the electrode line selection information, and at the same time, the clock signal CLK and the data signal D _O in accordance with the control signal of the microcomputer 20. To generate the output.

In addition, the driving IC which receives the selection signal among the first to fourth driving ICs 33a to 33b receiving the sustain pulse sequentially selects the horizontal electrode line of the corresponding block and generates the data signal D _O and the sustain pulse. The supplied scan pulse is supplied in synchronization with the clock signal CLK.

Accordingly, in the seventh embodiment of the present invention, as in the sixth embodiment described above, the electrode line scanning order in each block is sequentially performed to have temporal continuity, and two adjacent horizontal electrode lines between the block and the block are provided. The scanning sequence of (S120 and S121, S240 and S241, S360 and S361) also has temporal continuity, and each pulse (pulse a, pulse b, pulse c, pulse d) included in one period (period) of the driving pulse When supplied to a plurality of blocks of the horizontal electrode lines S1 to S480, that is, the first to fourth blocks S1 to S120, S121 to S240, S241 to S360, and S361 to S480, the driving pulses are not fixed to one block. The block is supplied with every change.

Meanwhile, in the above-described fifth to seventh embodiments of the present invention, the first and second blocks S1 to S240 and S241 of which the horizontal electrode lines S1 to S480 are 1/2 of the number of scan pulses included in one period of the driving pulse. Another embodiment is shown when the screen is divided and driven to block at S480).

In this case, the corresponding blocks supplied with the pulses a to d in the driving pulses shown in FIG. 2 may be supplied to one block by two pulses out of four pulses as described above in the second and fourth embodiments. One embodiment is derived.

As described above, the technical gist of the present invention divides the scan electrodes into any number of blocks, but differentiates the scan order in the blocks for each block or changes the corresponding blocks for supplying the random scan pulses in the driving pulses at regular intervals. For example, the data map stored in the horizontal electrode line address ROM is not limited to the first to seventh embodiments, so that each of the plurality of pulses included in one period (period) of the driving pulse makes the entire horizontal electrode line the same. In the case of being supplied to a plurality of blocks divided by a ratio, it includes all techniques that are not fixed to one block and that the blocks are changed in a predetermined order or randomly changed at regular intervals.

As described above, according to the present invention, the sequence of scanning the electrode lines in each block is sequentially performed to have temporal continuity, and the scanning sequence of two adjacent horizontal electrode lines between the blocks also has temporal continuity, When each pulse included in one period is supplied to a plurality of blocks of the horizontal electrode line, the corresponding blocks are changed at regular intervals, so that the amount and distribution of wall charges generated by the write pulses according to the temporal positional difference of the scan pulses. Since the difference is distributed in each block, the overall quality is improved.

1 is a block diagram of a typical split driving plasma display device.

FIG. 2 is a waveform diagram of a driving pulse for driving the plasma display device shown in FIG. 1.

3 is a frame structure diagram according to a conventional four-division subfield driving method.

4 is a frame structure diagram according to a conventional two-division subfield driving method.

FIG. 5 is a frame structure diagram illustrating a four division driving method of a plasma display device according to a first embodiment of the present invention; FIG.

6 is a frame structure diagram illustrating a two-division driving method of a plasma display device according to a second embodiment of the present invention;

FIG. 7 is a frame structure diagram illustrating a four division driving method of a plasma display device according to a third exemplary embodiment of the present invention; FIG.

8 is a frame structure diagram illustrating a two division driving method of a plasma display device according to a fourth embodiment of the present invention;

Claims (17)

After dividing one frame into specific subfields to implement a predetermined gray level, the horizontal electrode lines are divided into first to N blocks to divide the screen, and at every predetermined period when a random scan pulse in a driving pulse is supplied to the horizontal electrode lines. And a corresponding block among the first to N blocks is changed. The method of claim 1, And when the random scan pulse in the driving pulse is supplied to the horizontal electrode line, the corresponding block among the first to N blocks is changed in a predetermined order at predetermined intervals. The method of claim 1, And when a random scan pulse in the driving pulse is supplied to the horizontal electrode line, the corresponding block among the first to N blocks is randomly changed at every predetermined period. The method according to any one of claims 1 to 3, And the predetermined period is one of one period of the driving pulse, a predetermined multiple period of the driving pulse period, or a frame period. The method according to any one of claims 1 to 3, And the first to N blocks divide the entire horizontal electrode line by the same ratio. The method according to any one of claims 1 to 3, Wherein the number of the first to N blocks is equal to the number of scan pulses included in one period of the driving pulse. The method according to any one of claims 1 to 3, And the number of the first to N blocks is one half of the number of scan pulses included in one period of the driving pulse. The method of claim 1, When the scan pulse included in the driving pulse is supplied to the horizontal electrode line, the horizontal electrode line scan order in a predetermined block among the first to N blocks is performed in a sequential order, and the horizontal electrode line in a specific block adjacent to the predetermined block is performed. And the scanning order is performed in reverse order so that the scanning order between the predetermined block and the specific block has a temporal continuity. The method of claim 8, And the first to N blocks divide the entire horizontal electrode line by the same ratio. The method of claim 8, Wherein the number of the first to N blocks is equal to the number of scan pulses included in one period of the driving pulse. The method of claim 8, And the number of the first to N blocks is one half of the number of scan pulses included in one period of the driving pulse. The method according to any one of claims 8 to 11, Of the first to N blocks, the scanning order of the blocks and two adjacent horizontal electrode lines between the blocks are identically scanned first in each block, and the other horizontal electrode lines are sequentially scanned in each block, so that the two horizontal The method of driving a plasma display device, characterized in that the scanning order of the horizontal electrode line farthest from the electrode line is scanned last. The method according to any one of claims 8 to 11, Of the first to N blocks, the scanning order of the blocks and two adjacent horizontal electrode lines between the blocks are identically scanned last in each block, and the other horizontal electrode lines are sequentially scanned in each block to sequentially scan the two horizontal electrodes. A scanning method of a horizontal electrode line spaced farthest from an electrode line is first scanned. The method according to any one of claims 8 to 11, And when the random scan pulse in the driving pulse is supplied to the horizontal electrode line, the corresponding block among the first to N blocks is changed in a predetermined order at predetermined intervals. The method of claim 14, And the predetermined period is one of one period of the driving pulse, a predetermined multiple period of the driving pulse period, or a frame period. The method according to any one of claims 8 to 11, And when a random scan pulse in the driving pulse is supplied to the horizontal electrode line, the corresponding block among the first to N blocks is randomly changed at every predetermined period. The method of claim 16, And the predetermined period is one of one period of the driving pulse, a predetermined multiple period of the driving pulse period, or a frame period.