KR100778508B1 - Plasma display and driving method thereof - Google Patents

Abstract

The plasma display device includes a plurality of row electrodes, a plurality of column electrodes, and a plurality of discharge cells defined by the plurality of row electrodes and the plurality of column electrodes, respectively. In this case, in the first subfield located temporally among the plurality of subfields, the plurality of row electrodes are driven by dividing the plurality of row electrodes into first and second row groups. The light emitting cell is selected from the discharge cells of the group. During the selection of the light emitting cells among the discharge cells of the first row group, the discharge cells of the second row group are initialized as non-light emitting cells. Next, the light emitting cells of the first row group are sustained and discharged, and after the light emitting cells are selected from the discharge cells of the second row group, the light emitting cells of the second row group are sustained and discharged. In this case, like the first row group, the second row group whose addressing operation is performed later in time may also perform the addressing operation immediately after the reset operation is completed.

PDP, electrode, discharge, entry, reset, gradation, light emission, pseudo contour

Description

Plasma display device and driving method thereof {PLASMA DISPLAY AND DRIVING METHOD THEREOF}

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a division structure of each electrode applied to a method of driving a plasma display device according to an exemplary embodiment of the present invention.

3 is a diagram illustrating a method of driving a plasma display device according to a first embodiment of the present invention.

4 is a diagram illustrating the driving method of FIG. 3 using only subfields.

5 is a diagram illustrating a method of driving a plasma display device according to a second embodiment of the present invention.

The present invention relates to a plasma display device and a driving method thereof.

The plasma display device is a display device using a plasma display panel that displays text or an image by using plasma generated by gas discharge. In the plasma display panel, a plurality of discharge cells are arranged in a matrix form.

In the plasma display device, one field (1TV field) is divided into a plurality of subfields having respective weights and driven, and the gray level is displayed by a combination of the weights of the subfields in which the display operation occurs among the plurality of subfields. The discharge cells to emit light and the discharge cells not to emit light are selected in the address period of each subfield, and the discharge cells to emit light selected in the sustain period are sustained and discharged for a period corresponding to the weight of the subfield to display an image.

Such a plasma display device uses subfields having different weights for gray scale representation. The gray level of the corresponding discharge cell is expressed by the sum of the weights of the subfields in which the discharge cells emit light in the plurality of subfields. For example, in the case of using a weighted subfield in the form of a power of 2, a dynamic false contour occurs when one discharge cell expresses 127 gray levels and 128 gray levels, respectively, in two consecutive frames. do.

When the address period and the sustain period are separated in time, each subfield is provided with an address period for addressing all the discharge cells in addition to the sustain period for sustain discharge, so that the length of one subfield becomes long. As a result, the length of the subfield is long, which limits the number of subfields that can be used in one field.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a driving method thereof capable of reducing pseudo contours and reducing the length of a subfield.

According to one aspect of the present invention, in a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells respectively defined by the plurality of row electrodes and the plurality of column electrodes, A method of driving by dividing into a plurality of subfields is provided. The driving method includes dividing the plurality of row electrodes into first and second row groups in a first subfield located temporally among the plurality of subfields, and discharging the discharge cells of the first row group. Initializing the cell into a non-light emitting cell, while selecting a light emitting cell among the discharge cells of the first row group, and selecting the light emitting cell among the discharge cells of the first row group. Initializing, sustaining and discharging the light emitting cells of the first row group, selecting a light emitting cell among the discharge cells of the second row group, and sustaining and discharging the light emitting cells of the second row group. do.

According to another feature of the invention, a plurality of row electrodes for performing a display operation and a plurality of column electrodes formed in a direction crossing the row electrodes, the plurality of row electrodes and a plurality of column electrodes A plasma display panel in which discharge cells are formed, dividing a field into a plurality of subfields, dividing the plurality of row electrodes into first and second row groups, and dividing the row electrodes of the first row group into a plurality of first subgroups. And a control unit for dividing the row electrodes of the second row group into a plurality of second subgroups, and a driving unit for driving the plurality of row electrodes and the plurality of column electrodes. In this case, the driving unit may initialize the discharge cells of the first row group to non-light emitting cells in the first subfield that is temporally the most among the plurality of subfields, and then select the light emitting cells from the discharge cells of the first row group. During the selection, the discharge cells of the second row group are initialized to non-light emitting cells, sustained discharge of the light emitting cells of the first row group, the light emitting cells are selected from the discharge cells of the second row group, and the second row group Sustain discharge of the light emitting cells.

According to still another aspect of the present invention, a field in a plasma display device including a plurality of row electrodes and a plurality of column electrodes, and a plurality of discharge cells defined by the plurality of row electrodes and the plurality of column electrodes, respectively, A method of driving by dividing into a plurality of subfields is provided. The driving method includes dividing the plurality of row electrodes into first and second row groups, dividing the row electrodes of the first row group into a plurality of first subgroups, and dividing the row electrodes of the second row group into a plurality of first groups. Dividing into two subgroups, in which the discharge cells of the first row group are initialized in at least one first subfield of the plurality of subfields, and then the light emitting cells are selected from the discharge cells of the first row group. Initializing discharge cells of a second row group to non-light emitting cells, sustaining discharge of the light emitting cells of the first row group, selecting light emitting cells from the discharge cells of the second row group in the first subfield, and Sustain discharge of the light emitting cells of the 2 row group,

The plurality of second subfields while selecting a non-light emitting cell among light emitting cells of one first subgroup of the plurality of first subgroups in each second subfield of the plurality of second subfields of the plurality of subfields; Sustain-discharging the light emitting cells of at least one second subgroup of the group, and in each of the second subfields, non-light emitting cells are selected from among light emitting cells of one second subgroup of the plurality of second subgroups Sustaining and discharging light emitting cells of at least one first subgroup of the plurality of first subgroups.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the wall charge in the present invention refers to a charge formed close to each electrode on the wall (eg, the dielectric layer) of the cell. And the wall charge is not actually in contact with the electrode itself, but is described here as "formed", "accumulated" or "stacked" on the electrode. In addition, the wall voltage refers to the potential difference formed in the wall of the cell by the wall charge.

A plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500. It includes.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as "A electrodes") A _{1 to} A _m extending in the column direction, and a plurality of sustain electrodes extending in pairs in the row direction (hereinafter referred to as "A electrode"). , "X electrode" (X _{1 to} X _n ) and scan electrode (hereinafter referred to as "Y electrode") (Y _{1 to} Y _n ). In general, the X electrodes X ₁ to X _n are formed corresponding to the respective Y electrodes Y _{1 to} Y _n , and the X and Y electrodes perform a display operation for displaying an image in the sustain period. Y electrodes (Y ₁ ~Y _n) and X electrodes (X ₁ ~X _n) is arranged to be perpendicular to the A electrodes (A ₁ ~A _m). In this case, a discharge space at intersections of the A electrodes (A ₁ ~A _m) and the X and Y electrodes (X ₁ ~X _n, Y ₁ ~Y _n) forms a cell (12). The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention. In the following description, the X electrode and the Y electrode extending in pairs with each other in the row direction are referred to as row electrodes, and the A electrode extending in the column direction is referred to as column electrodes.

The controller 200 receives an image signal from the outside and outputs an A electrode driving control signal, an X electrode driving control signal, and a Y electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields, divides the plurality of row electrodes into first and second row groups, and divides the row electrodes of the first and second row groups into a plurality of subgroups, respectively. Control by dividing by.

The address electrode driver 300 receives an A electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each A electrode.

The scan electrode driver 400 receives a Y electrode driving control signal from the controller 200 and applies a driving voltage to the Y electrode.

The sustain electrode driver 500 receives the X electrode driving control signal from the controller 200 and applies a driving voltage to the X electrode.

Next, a driving method of the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a diagram illustrating a division structure of each electrode applied to a method of driving a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, one field is divided into a plurality of row electrodes X _{1 to} X _n and Y _{1 to} Y _{n to} two row groups G ₁ and G ₂ . In this case, the first row group G ₁ including the plurality of row electrodes X _{1 to} X _{n / 2} and Y _{1 to} Y _{n / 2} and the plasma display panel (that is, positioned above the plasma display panel ₁₀₀ ) 100) to the electrode _{(X (n / 2)} of the plurality which is located in the lower portion of the _{+1 ~X n, Y (n /} 2) +1 ~Y n) can be divided into the second line group (G ₂₎ containing the Each of the plurality of row electrodes X _{1 to} X _n , Y _{1 to} Y _n includes a first row group G ₁ including even-numbered row electrodes and a second row group G ₂ including odd-numbered row electrodes. You can also divide by). In each of the first and second row groups G ₁ and G ₂ , the plurality of Y electrodes are further divided into a plurality of subgroups G _{11 to} G ₁₈ and G _{21 to} G ₂₈ . In FIG. 2, it is assumed that each of the first and second row groups G ₁ and G ₂ is divided into _eight subgroups G _{11 to} G ₁₈ and G _{21 to} G ₂₈ .

That is, in the first row group G ₁ , the first to j th Y electrodes Y _{1 to} Y _j are set to the first subgroup G ₁₁ , and the (j + 1) to (2j) th Y The electrodes Y _{j + 1 to} Y _2j are set to the second subgroup G ₁₂ . In this manner, the (7j + 1) th to (n / 2) th Y electrodes Y _{7j + 1 to} Y _{n / 2} are set to the _eighth subgroup G ₈ (where j is 1 and n). Integer between / 16). Similarly, in the second row group G ₂ , the (8j + 1) th to (9j) th Y electrodes Y _{8j + 1 to} Y _9j are set to the first subgroup G ₂₁ , and (9j + 1) The first to (10j) th Y electrodes (Y _{9j + 1 to} Y _10j ) are set to the second subgroup G ₂₂ . In this manner, the (15j + 1) th to nth Y electrodes Y _{15j + 1 to} Y _n are set to the eighth subgroup G ₂₈ . Alternatively, the Y electrodes spaced apart at regular intervals within the first and second row groups G ₁ and G ₂ may be set as one subgroup, and the Y electrodes may be grouped in an irregular manner as necessary. It may be.

3 is a diagram illustrating a method of driving a plasma display device according to a first embodiment of the present invention.

3, one field consists of a plurality of subfields SF1 to SFL. In this case, the first subfield SF1 includes the reset period R, the address periods WA1 ₁ and WA1 ₂ , and the sustain periods S1 ₁ and S1 ₂ , and is optional in the address periods WA1 ₁ and WA1 ₂ . Use the entry method. The second to Lth subfields SF2 to SFL each include an address period EA2 _{11 to} EAL ₁₈ , EA2 _{21 to} EAL ₂₈ , and a sustain period S2 _{11 to} SL ₁₈ and S2 _{21 to} SL ₂₈ , respectively. The address periods EA2 _{1 to} EAL _{8 of} the second to Lth subfields SF2 to SFL have a selective erase address. As described with reference to FIG. 2, the plurality of row electrodes X _{1 to} X _n , Y _{1 to} Y _n are divided into two first and second row groups G ₁ and G ₂ . The two row groups G ₁ and G ₂ are each divided into a plurality of subgroups G _{11 to} G ₁₈ and G _{21 to} G ₂₈ .

Among the plurality of discharge cells, a selective writing method and a selective erasing method are used to select a discharge cell to emit light (hereinafter referred to as a "light emitting cell") and a discharge cell to emit no light (hereinafter referred to as a "non-light emitting cell"). have. The selective writing method selects light emitting cells to form a constant wall voltage, and the selective erasing method selects non-light emitting cells to erase the wall voltage already formed. That is, the selective write method is a method of address discharge of a cell in a non-light emitting cell state to form a wall charge and set it to a light emitting cell state, and the selective erasing method of addressing a cell in a light emitting cell state to discharge a wall charge already formed. It is a method of erasing and setting to a non-light emitting cell state. In the following, the address discharge for forming the wall charge in the selective writing method is called "write discharge", and the address discharge for erasing the wall charge in the selective erasing method is called "erasure discharge".

Again, see Figure 3, having an address period of the selective write method (WA1 _1, WA1 ₂₎ sub-field (SF1) during the address period (WA1 _1, WA1 ₂₎ a reset period for initializing a cell non-emission of the light emitting cells just prior (R ) Is formed. That is, in the reset period R of the first subfield SF1, the discharge cells of the first and second row groups G ₁ and G ₂ are initialized and set to the non-light emitting cell state, and the address periods WA1 ₁ and WA1. ₂ ) is set to a state where address discharge is possible.

delete

In this reset period (R), in order to initialize the discharge cell to the non-light emitting cell, it can be implemented using a gradually increasing voltage and a gradually decreasing voltage. That is, in the reset period R, the voltages of the plurality of Y electrodes may be gradually increased, and then the voltages of the plurality of Y electrodes may be gradually decreased. At this time, a constant voltage is applied to the X electrode, while a weak reset discharge occurs between the Y electrode and the X electrode while the voltage of the Y electrode is increased, and after the wall charge is formed in the discharge cell, the voltage of the Y electrode is decreased. As a weak reset discharge occurs between the Y electrode and the X electrode, the wall charges formed in the discharge cells can be erased and initialized to the non-light emitting cells. For this reason, strong discharge does not occur in the reset period R, so the contrast ratio can be increased.

An address period (WA1 ₁₎ in the first line group by the write discharge to the discharge cell to set the cell emission of the discharge cells of the (G ₁₎ forming the wall charges, and the sustain period (S1 ₁₎ the first line group from the (G ₁₎ The light emitting cells are sustained and discharged. At this time, in the sustain period S1 ₁ , a minimum sustain discharge, for example, is set such that only one or two sustain discharges occur. In the address period WA1 ₂ , wall discharge is formed by writing and discharging the discharge cells to be set as the light emitting cells of the discharge cells of the second row group G ₂ , and in the sustain period S1 ₂ , the first discharge period is formed in the first period S1 ₂₁ . And the light emitting cells of the second row groups G ₁ and G ₂ are sustained and discharged. In the sustain period S1 ₂ , only the light emitting cells of the second row group G ₂ are sustained and discharged in a state in which the light emitting cells of the first row group G ₁ are set so that sustain discharge does not occur in the remaining partial period S1 ₂₂ . Let's do it. At this time, the sustain period (S1 ₂₎ of the remaining part of the period (S1 ₂₂₎ the second row group (G ₂₎ the first line group from the number of times that sustain discharge occurs in the light emitting cells are sustain period (S1 ₂₎ in (G ₁₎ It is set to be equal to the number of times a sustain discharge occurs in the light emitting cell of.

In addition, when the weight of the first subfield SF1 is not satisfied by the two sustain periods S1 ₁ and S1 ₂ , the first and second rows of the remaining partial periods S1 ₂₂ of the sustain period S1 ₂ are not satisfied. The light emitting cells of the groups G ₁ and G ₂ can be further sustained discharged.

In the second subfield SF2, the address periods EA2 _{11 to} EA2 ₁₈ and the retention periods (in order of the first subgroup G ₁₁ to the eighth subgroup G ₁₈ ) for the first row group G ₁ . S1 _{11 to} SL ₁₈ are performed, and the address periods EA2 _{28 to} EA2 ₂₁ are maintained in order from the eighth subgroup G ₂₈ to the first subgroup G ₂₁ for the second row group G ₂ . Periods S1 _{28 to} SL ₂₁ are performed. The address periods EA3 _{11 to} EAL ₁₈ and EA3 _{21 to} EAL ₂₈ and the sustain periods S3 _{11 to} SL ₁₈ and S3 _{21 to} SL of the remaining subfields SF3 to SFL in the same manner as the second subfield SF2. ₂₈ ) is performed sequentially.

That is, in the kth subfield SFk of the first row group G ₁ , after the address period EAk _1i of the i th subgroup G _1i is performed, the sustain period of the i th subgroup G _1i (Sk _1i ) is performed (where k is an integer between 1 and L and i is an integer between 1 and 8). Subsequently, the address period EAk _{1 (i + 1} ) and the sustain period Sk _{1 (i + 1) of the (i + 1) th} subgroup G _{1 (i + 1} ) are performed. In the k th subfield SFk of the second row group G ₂ , the address period EAk _{2 (i + 1) of the (i + 1) th} subgroup G _{2 (i + 1} ) is performed. Thereafter, the sustain period Sk _{2 (i + 1) of the (i + 1) th} subgroup G _{2 (i + 1} ) is performed. Subsequently, the address period EAk _2i and the sustain period Sk _{2i of} the i th subgroup G _2i are performed. In this case, the the k-th sub-field while the (SFk) in the sustain period is carried out (Sk _1i) of the first i-th sub-group (G _1i) of the line group (G _1), the second row group (G ₂₎ ( the 8- (i-1)) sub-group _{(G 2 (8- (i-} 1))) during the address period _{(EAk 2 (8- (i-} 1)) of a) is carried out. In the k-th subfield SFk, the retention period Sk _{2 (} of the (8- (i-1)) th subgroup G _{2 (8- (i-1))} of the second row group G ₂ is determined. _{8- (i-1))} ) is performed, in the first row group G ₁ , the address period EAk _{1 (i + 1} ) of the (i + 1) subgroup G _{1 (i + 1) )} ) Is performed.

Meanwhile, in FIG. 3, in the second row group G ₂ , the address periods EAk _{28 to} EAk ₂₁ and the retention period Sk _{28 in} order from the eighth subgroup G ₂₈ to the first subgroup G ₂₁ . Although Sk ₂₁ is illustrated as being performed, unlike in FIG. 3, the second subgroup G ₂₁ to the eighth subgroup G ₂₁ are identical to the first row group G ₁ in the second row group G ₂ . ₂₈ ) address periods EAk _{21 to} EAk ₂₈ and sustain periods Sk _{21 to} Sk ₂₈ may be performed in order. In addition, the address period and the sustain period may be performed in the order different from that of FIG. 3 in the first and second row groups G ₁ and G ₂ .

Each subfield SF2 to SFL of the first row group G ₁ will be described in more detail. The operations of the address periods EA2 _{11 to} EAL ₁₈ and EA2 _{28 to} EAL ₂₁ and the sustain periods S2 _{11 to} SL ₁₈ and S2 _{28 to} SL _{21 in each} subfield SF2 to SFL are substantially the same. Will only be described for the operation in the k-th subfield SFk (where k is an integer between 1 and L).

In the address period EAk ₁₁ of the first subgroup G ₁₁ of the kth subfield SFk of the first row group G ₁ , a cell to be set as a non-light emitting cell among the light emitting cells of the first subgroup G ₁₁ . The wall charges are erased by erasing discharge, and the remaining light emitting cells of the first subgroup G ₁₁ are sustained and discharged in the sustain period Sk ₁₁ . Subsequently, in the address period EAk ₁₂ of the second subgroup G ₂₁ , the discharge cells set as the non-light emitting cells of the light emitting cells of the second subgroup G ₁₂ are erased and discharged to erase the wall charges, and the sustain period Sk. _{In 12} ), the remaining light emitting cells of the second subgroup G ₁₂ are sustained and discharged. At this time, sustain discharge also occurs in the light emitting cells of the first subgroup G ₁₁ . Similarly, the remaining portion group (G ₁₃ ~G ₁₈₎ during the address period (EAk ₁₃ ~EAk _18), and a sustain period (Sk ₁₃ ~Sk ₁₈₎ is performed for. At this time, the i-th sub-group (G _1i) sustain period (Sk _1i) in the light emitting cell and the first through the (i-1) sub-group of the sub-group i _{(G 1i) (G 11 ~G} 1 (i- of ₁₎ ) and sustain discharge also occurs in the light emitting cells of the (i + 1) to the eighth subgroups G _{1 (i + 1) to} G ₁₈ . At this time, the light emitting cells of the _{first to (i-1) th} subgroups G _{11 to} G _{1 (i-1} ) are each address period EAk _{11 to} EAk _{1 (i-1} ) of the kth subfield SFk. ₎ , And the light emitting cells of the (i + 1) to the 8th subgroups G _{1 (i + 1) to} G ₁₈ are each of the (k-1) subfield SF ( in the address periods EA (k-1) _{1 (i + 1) to} EA (k-1) _{18 in the} case of k-1). The light emitting cells of the i th subgroup G _1i may include the address period EA (k + 1) _1i of the i th subgroup G _1i of the (k + 1) th subfield SF (k + 1). The sustain discharge is performed up to the sustain period SK _{1 (i-1)} immediately before. That is, in the light emitting cells of the i-th subgroup G _1i , sustain discharge occurs for a total of 8 sustain periods.

In this way, all the sub-fields (SF1~SFL) each sub-group (G ₁₁ ~G ₁₈₎ during the address period _{(EA2 11 ~EA2 18, ...,} EAL 11 ~EAL 18) , and a sustain period (S2 ₁₁ ~S2 ₁₈ for in , ..., SL _{11 to} SL ₁₈ ) are performed. In this way, sustain discharge occurs in the sustain periods S1 ₁₁ to S1 ₁₈ and S1 ₂₁ to S1 _{28 of} the first subfield SF1 so that the discharge cells set as the light emitting cells are erased in each subfield SF2 to SFL. The sustain discharge is continued until the non-light emitting cell is set, and if the non-light emitting cell is the erase discharge, the sustain discharge is not started from the corresponding subfield. At this time, the weight of each subfield SF2 to SFL corresponds to the sum of the lengths of the eight sustain periods.

In the last subfield SFL of the first row group G ₁ , in order to make the number of sustain discharges in each subgroup G _{11 to} G ₁₈ equal to each other, the second to eighth subgroups G ₁₂ to G ₁₂ . One to seven maintenance periods (SA _{12 to} SA ₁₈ ) may be additionally performed for each of G ₁₈ ).

To this end, additional sustain periods SA _{12 to} SA ₁₈ may be formed in the last subfield SFL for the second to eighth subgroups G _{12 to} G ₁₈ , respectively. And additional sustain period (SA ₁₂ ~SA ₁₈₎ additional sustain period (SA ₁₂ ~SA ₁₈ of eight times the sustain period in order to prevent sustain discharge in the groups of rows are performed, each sub-group (G ₁₂ ~G ₁₈₎ in ) just before the erasure period (ER ₁₁ ~ER ₁₇₎ for erasing wall charges formed in the immediately preceding sub-groups (G ₁₁ ~G ₁₇₎ is formed.

On the other hand, an eighth subgroup of the additional sustain period (G ₁₈₎ (SA ₁₈₎ after may be the erase period (ER ₁₈₎ for erasing wall charges of the eighth sub-group (G ₁₈₎ is formed. In addition, since the reset period R is performed in the first subfield SF1 of the subsequent field, the erase period ER ₁₈ of the eighth subgroup G ₁₈ may not be formed. The erase operation in the erase periods ER _{11 to} ER ₁₈ may be sequentially performed on each row electrode of each subgroup as in the address period, or may be simultaneously performed on all row electrodes of each row group. .

Specifically, after the sustain period SL ₁₈ of the eighth subgroup G ₁₈ of the last subfield SFL of the first row group G ₁ is performed, the first subgroup in the erase period ER ₁₁ is performed. The wall charges formed in all the discharge cells in (G ₁₁ ) are erased. Then, the light emitting cells of the second to eighth subgroups G _{12 to} G ₁₈ are sustained and discharged in the additional sustain period SA ₁₂ . Then, after erasing the wall charges formed in all the discharge cells of the second subgroup G ₁₂ in the erasing period ER ₁₂ , the third to eighth subgroups G in the additional sustain period SA ₁₃ . _{13 to} G ₁₈ ) is discharged sustainably. In this way, it is performed until the additional holding period SA ₁₈ . In this case, the number of sustain discharges in the light emitting cells of each subgroup G _{11 to} G ₁₈ is the same.

Next, a will be described for each sub-field (SF1~SFL) of the second row group (G _2), the structure of each sub-field (SF1~SFL) of the second row group (G ₂₎ of the first row group ( G is ₁₎ substantially equal to the respective subfields (SF1~SFL) of. However, in each sub-field (SF1~SFL) of the second row group (G ₂₎ As mentioned earlier, the eighth subgroup (G ₂₈₎ from the first sub-group (G ₂₁₎ the order of the address period (EA1 ₂₈ ~EA1 ₂₁ , ..., EAL _{28 to} EAL ₂₁ ) are performed, and the erase periods ER _{21 to} ER ₂₈ in the last subfield SFL of the second row group G ₂ are also selected from the eighth subgroup G ₂₈ . 1 subgroup (G ₂₁ )

Such a driving method of the plasma display device can be expressed as shown in FIG. 4 only by the subfields. That is, in each subgroup G _{11 to} G ₁₈ and G _{28 to} G ₂₁ , the subfields SF2 to SF16 having the address period of the selective erasing method appear as shifted by a predetermined interval. In FIG. 4, one field includes 16 subfields SF1 to SF16. At this time, the predetermined interval is a sub-group (G _1i or G _2i) during the address period (EAk _1i or EAk _2i) and a subgroup one sustain period of the (G _1i or G _2i) (Sk _1i or Sk _2i for Corresponds to the length of). And the one of the sub-groups (G _1i or G _2i) during the address period (EAk _1i or EAk _2i) and a subgroup one sustain period (Sk _1i or Sk _2i) to (G _1i or G _2i) to the length Assuming that is the same, the start time of each subfield SF2 to SF16 of the second row group is the address period EAk _1i from the start time of each subfield SF2 to SF16 of the first row group G ₁ . Or EAk _2i ).

According to this, first it is possible to perform a sustain period for the first row electrode of a row group (G ₁₎ row electrodes during the address period for the second row group (G ₂₎ of the second row in the group (G ₂₎ A sustain period may be performed on the row electrodes of the first row group G ₁ during the address period of the electrodes. That is, since the address period and the sustain period are not separated and the sustain period can be performed during the address period, the length of one subfield can be reduced. In addition, since the address period is formed between the sustain periods of the respective subgroups, and the priming particles formed in the sustain period can be sufficiently utilized in the address period, the scan pulse can be shortened to perform high-speed scanning.

However, the addressing operation is performed after the addressing operation is performed on all the discharge cells of the first row group G _{1 in} the discharge cells of the second row group G ₂ in the first subfield SF1. That is, it has a first row group of discharge cells (G ₁₎ an address period in which an addressing operation is performed for all discharge cells of the (WA1 ₁₎ a second line group during the (G ₁₎ rest period. The idle period for the second row group (G ₁₎ a discharge is lost the priming particles within the cells of the second row group (G ₁₎ the second row in the address period (WA1 ₂₎ that is the addressing operation is performed for discharge cells of The write discharge may hardly occur for the discharge cells of the group G ₁ . Hereinafter, an embodiment in which the write discharge can stably occur even in the discharge cell in which the addressing operation is performed later in time will be described in detail with reference to FIG. 5.

5 is a diagram illustrating a method of driving a plasma display device according to a second embodiment of the present invention.

As shown in FIG. 5, according to the second embodiment of the present invention, a reset operation for all the discharge cells of the first row group G ₁ and a reset operation for all the discharge cells of the second row group G ₂ is performed. Unlike the first embodiment, each is performed. That is, during the reset period R ₁ , a reset operation is performed on all the discharge cells of the first row group G ₁ , and all the discharge cells of the second row group G ₂ have an idle period. In addition, while the addressing operation is performed on all the discharge cells of the first row group G ₁ in the address period WA1 ₁ , the reset is performed on all the discharge cells of the second row group G ₂ in the reset period R ₂ . The operation is performed. In this case, since all the discharge cells of the second row group G ₂ can perform the address period WA1 ₂ immediately after the reset operation, the write discharge is stable even in the discharge cells of the second row group G ₂ . Can happen.

Meanwhile, in the first and second embodiments of the present invention, the erase periods ER ₁₂ to ER ₁₈ and ER ₂₂ to the first and second row groups G ₁ and G ₂ in the last subfield SFL of one field. ER ₂₈ ) and additional retention periods SA _{12 to} SA ₁₈ , SA _{22 to} SA ₂₈ are formed, but may be deleted. When the erasing periods ER _{12 to} ER ₁₈ and ER _{22 to} ER ₂₈ and the additional holding periods SA _{12 to} SA ₁₈ and SA _{22 to} SA ₂₈ are deleted, each group G ₁ and G ₂ is spread over a plurality of fields. In the subgroups G _{11 to} G ₁₈ and G _{21 to} G ₂₈ . Then, the number of sustain discharges in each row group can be the same.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, the plurality of row electrodes are divided into first and second row groups, and the row electrodes of each group are further divided into a plurality of subgroups. In each of the plurality of subfields consecutive in one field, an address period for each subgroup of the first and second row groups is performed, and a sustain period is performed between the address periods of each subgroup. In this case, the selective erasing method is used in the address period of each subfield. In addition, an address period for each subgroup of the second row group is performed while the retention period for each subgroup of the first row group is performed, and a first row group for the address period for each subgroup of the second row group A retention period is performed for each subgroup in. In this way, an address period is formed between the sustain periods of each subgroup, and the priming particles formed in the sustain period can be fully utilized in the address period, so that the scan pulse can be shortened to perform high-speed scanning, and the sustain period can be maintained for the address period. This can reduce the length of one subfield.

In addition, when the selective write method is used in the subfields temporally preceding the plurality of subfields using the selective erasing method, sufficient wall charges can be formed, thereby stably erasing the subfields using the selective erasing method. Discharge may occur. In this case, the addressing operation is performed later in time by performing the reset period immediately before the address period for each row group without simultaneously performing the reset periods for the first and second row groups in the subfield using the selective write method. The addressing operation is also stably performed in the discharge cells of the row group.

Claims (9)

A plasma display device including a plurality of row electrodes, a plurality of column electrodes, and a plurality of discharge cells defined by the plurality of row electrodes and the plurality of column electrodes, respectively, for driving one field divided into a plurality of subfields. In the method, In a first subfield located temporally among the plurality of subfields, Dividing the plurality of row electrodes into first and second row groups, Initializing the discharge cells of the first row group to non-light emitting cells, Selecting a light emitting cell among the discharge cells of the first row group; Initializing the discharge cells of the second row group to non-light emitting cells while selecting the light emitting cells of the discharge cells of the first row group, Sustain-discharging the light emitting cells of the first row group; Selecting a light emitting cell among the discharge cells of the second row group, and Sustain-discharging the light emitting cells of the second row group Including; And wherein the light emitting cells of the first row group are not sustained discharged during some of the periods of sustain discharge of the light emitting cells of the second row group. The method of claim 1, In each of the plurality of second subfields located later in time in succession with the first subfield, Dividing the row electrodes of the first row group into a plurality of first subgroups and dividing the row electrodes of the second row group into a plurality of second subgroups, Sustain-discharging the light emitting cells of at least one second subgroup of the plurality of second subgroups while selecting a non-light emitting cell among the light emitting cells of one first subgroup of the plurality of first subgroups, and Sustain-discharging the light emitting cells of at least one first subgroup of the plurality of first subgroups while selecting a non-light emitting cell among the light emitting cells of one second subgroup of the plurality of second subgroups Method of driving a plasma display device comprising a. The method of claim 2, The plurality of row electrodes includes a plurality of first electrodes and a plurality of second electrodes that perform a display operation together with the plurality of first electrodes. Setting the plurality of discharge cells of the first row group as non-light emitting cells, Gradually increasing the voltage difference between the first electrode and the second electrode belonging to the first row group, and then gradually decreasing the voltage difference Including; Setting the plurality of discharge cells of the second row group as non-light emitting cells, Gradually increasing the voltage difference between the first electrode and the second electrode belonging to the second row group, and then gradually decreasing the voltage difference Method of driving a plasma display device comprising a. The method of claim 3, In each of the second subfields, Sustain-discharging the light emitting cells of at least one second subgroup of the plurality of second subgroups while selecting a non-light emitting cell among the light emitting cells of another first subgroup of the plurality of first subgroups, and Sustain-discharging the light emitting cells of at least one first subgroup of the plurality of first subgroups while selecting a non-light emitting cell among the light emitting cells of another second subgroup of the plurality of second subgroups The driving method of the plasma display device further comprising. delete The method according to any one of claims 1 to 4, And a light emitting cell of the first row group is sustained and discharged in the first subfield for a period other than the partial period of the light emitting cells of the second row group. A plasma display panel including a plurality of row electrodes for performing a display operation and a plurality of column electrodes formed in a direction crossing the row electrodes, wherein a plurality of discharge cells are formed by the plurality of row electrodes and the plurality of column electrodes , Dividing a field into a plurality of subfields, dividing the plurality of row electrodes into first and second row groups, dividing the row electrodes of the first row group into a plurality of first subgroups, A control unit for dividing the row electrodes into a plurality of second subgroups, and It includes a drive unit for driving the plurality of row electrodes and the plurality of column electrodes, The driving unit, In a first subfield temporally of the plurality of subfields, a second row while selecting the light emitting cells from the discharge cells of the first row group after initializing the discharge cells of the first row group to non-light emitting cells Initializing discharge cells of the group into non-light emitting cells, sustaining discharge of the light emitting cells of the first row group, And a light emitting cell selected from the discharge cells of the second row group, and sustain discharge of the light emitting cells of the second row group. The method of claim 7, wherein The driving unit, In each of the plurality of second subfields that are contiguous with the first subfield, Selecting a non-light emitting cell among the light emitting cells of each first subgroup during a first period for each first subgroup of the plurality of first subgroups, and the plurality of first subgroups during the second period of at least some of the first subgroups Sustain discharge the light emitting cells of at least one second subgroup of the second subgroup of Selecting a non-light emitting cell among light emitting cells of each second subgroup during a third period of time between each second subgroup of the plurality of second subgroups, wherein the non-light emitting cell is located between the first periods; And sustain discharge of light emitting cells of at least one first subgroup of the plurality of first subgroups during a fourth period of time. A plasma display device including a plurality of row electrodes, a plurality of column electrodes, and a plurality of discharge cells defined by the plurality of row electrodes and the plurality of column electrodes, respectively, for driving one field divided into a plurality of subfields. In the method, Dividing the plurality of row electrodes into first and second row groups, dividing the row electrodes of the first row group into a plurality of first subgroups, and dividing the row electrodes of the second row group into a plurality of second subgroups step, A discharge cell of the second row group for selecting a light emitting cell from the discharge cells of the first row group after initializing the discharge cells of the first row group in at least one first subfield of the plurality of subfields Initializing the non-light emitting cell to sustain discharge of the light emitting cells of the first row group; Selecting a light emitting cell from the discharge cells of the second row group in the first subfield and sustain-discharging the light emitting cells of the second row group; In each second subfield of the plurality of second subfields of the plurality of subfields, the plurality of second subfields while selecting non-light emitting cells of light emitting cells of one first subgroup of the plurality of first subgroups Sustain-discharging the light emitting cells of at least one second subgroup of the group, and In each of the second subfields, light emitting cells of at least one first subgroup of the plurality of first subgroups are selected while non-light emitting cells are selected from among light emitting cells of one second subgroup of the plurality of second subgroups. Driving discharge of the plasma display device;

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