KR20080047871A - Plasma display device and driving method thereof - Google Patents

Abstract

A plasma display apparatus and a driving method thereof are provided to reduce address power consumption by detecting variation amount of vertical and horizontal line data at respective row lines. A plasma display apparatus includes a plasma display panel having first and second electrodes and discharge cells, a controller for processing image signals, and a driver for driving the plasma display panel. The controller includes a sub-field data generator(410) and an address automatic power controller(420). The sub-field data generator generates sub-field data corresponding to image signal data of a frame. The address automatic power controller compares data of adjacent row lines for respective sub-fields, detects variation amount of vertical line data, and executes an address power consumption reducing process that equalizes data of the adjacent row lines when the detected variation amount of vertical line data are more than a reference value.

Description

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

1 is a diagram illustrating an electrode array of a plasma display panel.

2 is a schematic plan view of a plasma display device according to an exemplary embodiment of the present invention.

3 is a schematic block diagram of a controller of a plasma display device for reducing address power consumption according to an exemplary embodiment of the present invention.

4 is a block diagram illustrating an internal configuration of an address automatic power control unit according to an embodiment of the present invention.

5 is a diagram illustrating a method of comparing column direction data of each row line of a plasma display panel according to an exemplary embodiment of the present invention.

6 is a view showing an address power consumption reduction processing method according to an embodiment of the present invention.

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

A plasma display device is a flat display device using a plasma display panel that displays a character or an image using plasma generated by gas discharge. The plasma display device is arranged in a matrix form in which tens to millions of pixels (discharge cells) are arranged in a matrix form depending on the size thereof. have.

Such a plasma display device divides video signal data of one input frame into a plurality of subfields, and time-divisions the subfields to express gray scales. Each subfield consists of a reset period, an address period, and a sustain period. At this time, the reset period is a period for initializing the state of each cell in order to perform an addressing operation smoothly on the cell, and the address period is a cell (addressed cell) that is turned on to select a cell that is turned on and a cell that is not turned on. This is a period in which an address discharge is applied by applying an address voltage to accumulate wall charges. The sustain period is a period in which a discharge for actually displaying an image in the addressed cell is applied by applying a sustain discharge pulse.

1 is a diagram illustrating an electrode array of a plasma display panel.

As shown in Fig. 1, the electrodes of the plasma display panel are arranged in a matrix of m × n. Specifically, m columns of address electrodes A1-Am are arranged in the column direction and n rows are scanned in the row direction. The electrodes Y1-Yn and the sustain electrodes X1-Xn are arranged in a zigzag. At this time, a discharge space at a portion where the address electrodes A1 to Am and the sustain and scan electrodes X1 to Xn and Y1 to Yn cross each other forms a discharge cell 12.

In the plasma display panel formed as described above, scan pulses are sequentially applied to the scan electrodes Y1 to Yn in the row direction during the address period of each subfield, and selected as cells to be turned on among the address electrodes A1 to Am in the column direction. An address pulse is applied to the address electrode passing through the discharge cell. Then, in the discharge cells in which the scan electrode and the address electrode are selected at the same time, the address discharge occurs and the cell to be turned on is selected (addressing). That is, an address pulse is applied to a plurality of column lines (address electrodes) passing through cells to be turned on among a plurality of column lines (address electrodes) intersecting the row lines (scan electrodes) to which the scan pulses are applied. This method is sequentially performed for each row line. However, in order to apply the address pulse voltage to the address electrode, switching occurs in a circuit. Therefore, the more the case where the data of a certain row line is different from the data of the previous row line in the vertical direction in each row line, the number of switching of the address electrode increases, thereby increasing the address power consumption.

In addition, since the discharge space between the scan electrode and the sustain electrode of the plasma display panel, the surface on which the address electrode is formed, and the surface on which the scan and sustain electrode are formed act as a capacitive load, capacitance is present in the panel. Therefore, in order to apply the waveform for addressing, in addition to the power for the address discharge, the reactive power for charge injection generating a predetermined voltage in the capacitance is required. At this time, when the number of switching of the address electrode is large, more address power is consumed.

In particular, in the dot pattern image data in which the data of the row lines are continuously changing from 1 to 0 and 0 to 1 in the vertical direction, a lot of switching occurs on the address electrodes. Also, in the case of line pattern image data in which the image pattern changes in each line, the data varies in each line, so that the number of times of switching of the address electrodes increases, thereby increasing the address power consumption. That is, the larger the difference between the pixel of the previous line and the pixel of the current line, the more frequently the switching of the address electrode occurs, there is a problem that the power consumption increases.

In order to solve such a problem, conventionally, when it is determined whether the input image signal data is data having high address power consumption (dot pattern or line pattern, etc.) and the power consumption is determined to be high, the entire data of any subfield is The address power consumption was reduced by regenerating the subfield data so as to be the same (turning all discharge cells on or off).

However, when any subfield in which the entire data is reproduced is a subfield having a high weight, the high gradation expression power of the image is deteriorated. And Any subfield In the case of a low weight subfield, there is a problem in that the low gradation power of the image is lowered and the overall luminance is lowered. In addition, there is a limit in that address power consumption is reduced only in a specific image having a large switching amount of the entire address electrode such as a dot pattern or a line pattern.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a method of driving the same, which reduce address power consumption in all images and control gradation power and luminance at an original image level.

According to a feature of the present invention for achieving the above object is provided a plasma display device. The plasma display device includes a plurality of first electrodes and a plurality of second electrodes crossing the plurality of first electrodes, wherein the plurality of discharge cells are formed by the plurality of first and second electrodes. And a control unit for controlling the input image signal of one frame to be divided into a plurality of subfields, and a driving unit for driving the plasma display panel according to a control signal of the control unit. In this case, the control unit may include a subfield data generation unit for generating subfield data corresponding to the input image signal data of one frame and the data of each adjacent row line for each subfield from the subfield data in a column direction to compare the lines. And an address automatic power control unit for detecting a change amount of the vertical data and performing an address power reduction process for converting the data of the adjacent row lines equally to each other when the detected amount of change in the line vertical data is equal to or greater than a reference value.

According to another aspect of the present invention, a plasma display panel includes a plasma display panel in which a plurality of discharge cells are formed at a point where a plurality of row lines and a plurality of column lines intersect, and controls one frame by dividing it into a plurality of subfields. A method of driving a device is provided. The driving method of the plasma display apparatus includes generating subfield data corresponding to input image signal data of one frame, and comparing data of adjacent row lines for each subfield in the subfield data in a column direction. Detecting a change amount of the vertical data, comparing the detected amount of change of the line vertical data with a reference value, and converting data of the adjacent row lines equally to each other when the detected amount of change of the line vertical data is larger than the reference value; do.

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. Like parts are designated by like reference numerals throughout the specification.

In addition, when any part of the specification to "include" any component, which means that it may further include other components, except to exclude other components unless otherwise stated.

A plasma display device and a driving method thereof according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

2 is a schematic plan view of a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, an address electrode driver 200, a scan and sustain electrode driver 300, and a controller 400.

The plasma display panel 100 includes a plurality of address electrodes A1 to Am extending in the column direction, and a plurality of sustain electrodes X1 to Xn and scan electrodes Y1 to Yn extending in pairs in the row direction. Include. At this time, the sustain electrodes X1 to Xn are formed corresponding to the scan electrodes Y1 to Yn, and generally, one end thereof is commonly connected to each other. At this time, the discharge space at the intersection of the address electrodes A1 to Am and the sustain and scan electrodes X1 to Xn and Y1 to Yn forms a discharge cell.

The address electrode driver 200 receives an address drive control signal from the controller 400 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1 to Am.

The scan and sustain electrode driver 300 receives the scan and sustain electrode drive control signals from the controller 400 and applies a driving voltage to the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn. In addition, in the embodiment of the present invention, the scan and sustain electrode driving unit is shown as one, but the driving unit of each electrode may be separately driven.

The controller 400 receives R, G, and B image signals and a synchronization signal from the outside, divides one frame into several subfields having respective weights, and divides each subfield into a reset period, an address period, and a sustain period. Drive the display panel. At this time, the control unit 400 according to an embodiment of the present invention detects the amount of data change for each subfield through the subfield data of one frame, and outputs a control signal for reducing address power consumption when the detected amount of data change is large. do.

Hereinafter, a plasma display device and a driving method thereof according to an exemplary embodiment of the present invention for controlling to reduce address power consumption will be described.

Hereinafter, the controller 400 according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a schematic block diagram of a controller of a plasma display device for reducing address power consumption according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the control unit 400 of the plasma display device according to an exemplary embodiment of the present invention includes a subfield data generation unit 410, an address automatic power control unit 420, and an address data generation unit 430. .

The subfield data generator 410 generates subfield data for the discharge cells that are turned on / off in each subfield corresponding to the image signal data currently input to the address automatic power controller 420. send.

The address automatic power control unit 420 (hereinafter referred to as an "address APC unit") determines whether the data for each subfield is data that consumes a lot of address power from the subfield data output from the subfield data generation unit 410. Judge. As a result of the determination, when a large amount of address power consumption is consumed, the subfield data is converted and output to the address data generator 430 to reduce the address power consumption.

At this time, the address APC unit 420 converts the data of each row line in the column direction with the data of the adjacent row for each subfield to detect whether the data of each subfield of one frame consumes a lot of address power or data. Compare and detect changes in data. That is, the number of switching of the address electrode is detected.

The address data generator 430 rearranges the converted subfield data output from the address automatic power controller 420 into address data for driving the plasma display device, thereby controlling the address electrode driver 200. The address control signal is generated and output to the address electrode driver 200.

The address electrode driver 200 applies an address pulse to the address electrode of the plasma display panel 100 according to the address control signal transmitted from the address data generator 430.

Meanwhile, before generating the subfield data in the above-described subfield data generator 410, the controller 400 maps the R, G, and B image signal data of i bits currently input to the inverse gamma curve to j bits. It may include an inverse gamma correction unit (not shown) that corrects the video signal of (j> i). The apparatus may further include an error diffusion unit (not shown) for error diffusion of the lower ji bit image of the j-bit image extended by inverse gamma correction to surrounding pixels, and generating the subfield data using the error-diffused data. The data may be transmitted to the unit 410 to generate subfield data as in the embodiment of the present invention. In this case, when an analog video signal is input to the plasma display panel as a digital signal, it is necessary to convert the analog video signal into digital video signal data using an analog-to-digital converter (not shown).

According to an exemplary embodiment of the present invention, whether the data of each subfield is turned on or off from the image signal of one frame to which the address automatic power control unit 420 is input (column adjacent to the subfield data of the previous cell in the address electrodes of the same column). It is possible to determine whether the address power consumption is large by detecting the difference in the subfield data of the cell. Hereinafter, a method of reducing the address power consumption will be described in detail with reference to FIGS. 4 to 6.

4 is a block diagram illustrating an internal configuration of an address automatic power control unit according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a method of comparing column direction data for each row line of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 6 is a diagram illustrating a method of reducing address power consumption according to an exemplary embodiment of the present invention. . 5 and 6, each discharge cell of the plasma display panel 100 is briefly represented in a matrix form, and data of a cell to be turned on is represented by 1 and data of a cell not to be turned on is represented by 0.

As shown in FIG. 4, the address APC unit 420 according to an exemplary embodiment of the present invention includes a data change detector 421, a reference value generator 422, and a data conversion controller 423.

The data change detector 421 detects a line vertical data change amount between adjacent row lines for each subfield by using the subfield data transmitted from the subfield data generator 410. The data change detector 421 transmits the line vertical data change amount detected for each adjacent row line to the reference value generator 422 and the data conversion controller 423.

Specifically, as illustrated in FIG. 5, the data change detection unit 421 compares data of the first and second row lines Y1 and Y2 among the plurality of row lines of one subfield in the column direction (vertical). That is, the A1 column line data of the Y1 row line and the A1 column line data of the Y2 row line are compared to detect the amount of change in the vertical data of the A1 column line among the Y1 and Y2 row line data. Then, the A2 column line data of the Y1 row line and the A2 column line data of the Y2 row line are compared to detect the amount of change in the vertical data of the A2 column line among the Y1 and Y2 row line data. In this manner, the vertical data change amount is detected for each column line between the Y1 and Y2 row lines. The total amount of change in data (hereinafter, referred to as “line vertical amount of change in data”) is calculated by adding up the amount of vertical data change in each adjacent row line. At this time, the data change detection unit 421 detects the number of discharge cells in which column line (vertical) data of each adjacent row line is changed from 1 to 0, or 0 to 1, so as to change the number of column line data between two row lines (data Calculate the amount of change).

로 나타내었다. 예를 들어, 제1 및 제2 행 라인(Y1 및 Y2 행 라인)간의 라인 수직 데이터 변화량은

으로 나타내었다. 이때, 도 5에서는 전체 행 라인과 열 라인의 개수가 각각 6개인 플라즈마 표시 패널을 나타내었으나, 전체 행 라인과 열 라인의 개수가 많은 일반적인 플라즈마 표시 패널에서도 적용할 수 있음은 당연하다.5 shows the line vertical data variation

Represented by. For example, the amount of line vertical data change between the first and second row lines Y1 and Y2 row lines is

As shown. 5 shows a plasma display panel in which the total number of row lines and column lines is six, respectively, but it is obvious that the present invention can be applied to a general plasma display panel having a large number of all row lines and column lines.

Meanwhile, in the exemplary embodiment of the present invention, the line vertical data change amount is detected by comparing the column line data of the adjacent first and second row lines and detecting the column direction data of the third and fourth row lines. However, each column line data of the first and second row lines is compared to detect a line vertical data change amount, and each column line data of the second and third row lines is compared to detect a line vertical data change amount. It is also possible to detect a line vertical data change amount between the row lines.

)을 모두 더해 한 서브필드의 전체 수직 데이터 변화량(

)을 계산하고, 계산된 한 서브필드의 전체 수직 데 이터 변화량(

)을 이용하여 기준값(

)을 생성한 후 이를 데이터 변환 제어부(423)로 전송한다.Next, the reference value generator 422 changes the line vertical data change amount between the row lines transmitted from the data change detector 421.

) Plus all of the total vertical data change in one subfield (

) And calculates the total vertical data change (

Using the

) Is generated and transmitted to the data conversion control unit 423.

)과 각 서브필드의 가중치를 고려하여 어드레스 소비전력 저감 처리를 여부를 판단하기 위한 기준값을 생성한다. 이때, 기준값은 입력되는 영상 신호 중 각 서브필드의 어드레스 소비전력이 많이 소비되는지 여부와 어드레스 소비전력 저감처리 시 화면 깨짐 현상이 발생하는 값 등을 고려한 실험값으로 구할 수 있다. 이때, 기준값 생성부(422)는 각 서브필드 별로 각 전체 수직 데이터 변화량(

)에 따른 기준값을 저장하고 있는 룩업 테이블(미도시)을 더 포함할 수 있다. 또한, 기준값 생성부(422)는 입력되는 영상 신호의 서브필드 데이터에서 저계조를 표현하는 서브필드에서 적용하는 기준값을 고계조를 표현하는 서브필드의 기준값 보다 상대적으로 낮게 생성할 수 있다.In detail, the reference value generator 422 detects the total vertical data change amount detected for each subfield from the input subfield data (

) And a weight value of each subfield are generated to generate a reference value for determining whether or not to perform an address power reduction process. In this case, the reference value may be obtained as an experimental value considering whether a large amount of address power consumption of each subfield is consumed among input video signals, and a value in which a screen break occurs in the address power reduction process. At this time, the reference value generator 422 changes the total amount of vertical data change for each subfield (

It may further include a look-up table (not shown) that stores a reference value according to). In addition, the reference value generator 422 may generate a reference value applied in the subfield representing the low gray level in the subfield data of the input image signal to be relatively lower than the reference value of the subfield representing the high grayscale.

)과 기준값 생성부(422)로부터 전송된 기준값(

)을 비교하여, 그 결과에 따라 각 행 라인 별로 어드레스 소비전력 저감처리를 한다.The data conversion control unit 423 may change the amount of change in each line vertical data of each subfield transmitted from the data change detection unit 421.

) And the reference value transmitted from the reference value generator 422 (

), And address power reduction processing is performed for each row line according to the result.

)과 기준값(

)을 비교한다. 이때, 라인 수직 데이터 변화량(

)이 기준값(

)보다 큰 경우에 어드레스 소비전력 저감처리를 수행한다. 반대로, 각 행 라인 별 데이터 변화량(

)이 기준값 보다 작은 경우에는 원래의 데이터를 출력한다.That is, the data conversion control unit 423 determines the line vertical data change amount of each adjacent row line for each subfield (

) And reference value (

). At this time, the line vertical data change amount (

) Is the reference value (

If larger than), address power consumption reduction processing is performed. Conversely, the amount of data change for each row line (

) Is smaller than the reference value, the original data is output.

)이 기준값(

) 이상인 경우, 제2 행 라인(Y2)의 데이터 값을 제1 행 라인(Y1)의 데이터 값으로 변환한다. 마찬가지로, 제3 및 제4 행 라인의 라인 수직 데이터 변화량(

)이 기준값(

) 이상이면 제4 행 라인(Y4)의 데이터 값을 제3 행 라인(Y3)의 데이터 값으로 변환한다. 또한, 제5 및 제6 행 라인의 라인 수직 데이터 변화량(

)이 기준값(

) 보다 작은 경우 원래의 데이터를 유지한다. Specifically, as shown in FIG. 6, the line vertical data change amount between the first and second row lines Y1 and Y2 (

) Is the reference value (

), The data value of the second row line Y2 is converted into the data value of the first row line Y1. Similarly, the line vertical data change amount of the third and fourth row lines (

) Is the reference value (

), The data value of the fourth row line Y4 is converted into the data value of the third row line Y3. Also, the line vertical data change amount of the fifth and sixth row lines (

) Is the reference value (

If less than), keep the original data.

)에 따라 각 행 라인 간의 데이터를 변환하고, 이와 같이 변환된 각 행 라인의 데이터로부터 각 서브필드 데이터를 생성하여 어드레스 데이터 생성부(430)로 전송한다. 이때, 기준값은 고계조를 표현하는 서브필드에서보다 저계조를 표현하는 서브필드에서 상대적으로 더 높게 설정될 수 있다. 이는, 고계조를 표현하는 서브필드에서 어드레스 소비전력 저감처리 시 각 행 라인의 데 이터가 인접 행 라인의 데이터로 변환되는 비율이 높을수록 화면 깨짐 현상이 커질 수 있으므로 기준값을 높게 하여 안정된 화면을 출력하기 위함이다.As described above, the data conversion controller 423 determines the line vertical data change amount of each row line for each subfield (

Data between each row line is converted, and each subfield data is generated from the data of each converted row line and transmitted to the address data generator 430. In this case, the reference value may be set relatively higher in the subfield representing the low grayscale than in the subfield representing the high grayscale. In the subfield expressing the high gradation, the higher the rate at which the data of each row line is converted to the data of the adjacent row line during the address power consumption reduction process, the more the screen breakage may occur. To do this.

In the embodiment of the present invention, the data of the current row line is converted into the data of the previous row line when the data of each row line is converted. However, a method such as converting data of a previous row line into data of a current row line is possible.

When the address power consumption reduction process is performed in this manner, as shown in FIG. 6, the amount of change in line vertical data for every row line is smaller than the amount of change in line vertical data shown in FIG. 5. Therefore, the number of switching of the address electrode is reduced, thereby reducing the address power consumption.

In addition, since the power consumption reduction process is determined for each row line of each subfield, address power consumption can be reduced in all images, and gray scale and gradation can be expressed close to the original image level.

On the other hand, in order to apply a waveform for addressing in each address period of the plurality of subfields, in addition to the power for address discharge, a gap is formed between the address electrodes A1 to Am and the scan electrodes Y1 to Yn of the plasma display panel 100, respectively. Reactive power is required to charge and discharge the panel capacitor. That is, as described above, the data change detection unit 421 compares the data of the plurality of row lines in the column direction (vertical) to detect the line vertical data change amount such as the address electrodes A1 to Am and the scan electrode Y1. This is to determine whether a large amount of reactive power is consumed for charging and discharging the panel capacitor formed between ˜Yn). In the address period of each subfield, however, reactive power for charging and discharging the panel capacitor formed between the address electrodes A1 to Am and the address electrodes A1 to Am in the plasma display panel 100 is also required. Accordingly, the data change detector 421 detects the horizontal data change amount by comparing the data of the plurality of row lines with data changes of adjacent cells in the horizontal direction as well as the column direction (vertical).

Specifically, as shown in FIG. 5, the data of each discharge cell of the first row line Y1 is compared in the horizontal direction. That is, the amount of horizontal data change of the A1 column line and the A2 column line of the Y1 row line data is detected by comparing the A1 column line data and the A2 column line data of the Y1 row line. Then, the A2 column line data of the Y1 row line and the A3 column line data are compared to detect the horizontal data change amount of the A2 column line and the A3 column line among the Y1 row line data. In this manner, the horizontal data change amount of each row line can be detected, and the sum of all the horizontal data change amounts (hereinafter, referred to as "line horizontal data change amount") for each row line can be detected.

In this case, the A1 column line data and the A2 column line data of the Y1 row line are compared and the A2 column line data and the A3 column line data are compared again, but the column line data of each row line may be compared without overlapping. . That is, the A1 column line data and the A2 column line data of the Y1 row line are compared, and the A3 column line data and the A4 column line data are compared. At this time, the data change detection unit 421 detects the number of discharge cells in which adjacent column line data of each row line is changed from 1 to 0, or 0 to 1, so that the number of horizontal data changes between the column lines of each row line (data change amount). Calculate

Next, when the total horizontal data change amount of each row line is detected, the address APC unit 420 reduces power consumption between the column lines of each row line through an operation process similar to that after detecting the line vertical data change amount. In other words, when the detected amount of change in the line horizontal data is compared with the reference value, if the amount of change in the line horizontal data is greater than or equal to the reference value, address power consumption reduction processing is performed.

Specifically, in FIG. 6, the amount of change in vertical data of each line is detected, and address power consumption is reduced by converting vertical data of each column line between adjacent row lines in accordance with the value. On the other hand, the address power consumption reduction process according to the line horizontal data change amount converts the data of each adjacent column line equally when the line horizontal data change amount of each row line is equal to or larger than the reference value. For example, it is assumed that an image expressed when a screen is composed of six row lines and six column lines as in the plasma display panel 100 shown in FIG. 5 is a dot pattern. Here, the dot pattern means that each column line data of each row line alternates 0 and 1, and each row line data of each column line alternates 0 and 1, respectively. That is, in the case of the Y1 row line, the A1 column line data is 0, and the A2 column line data has 1. The A3 column line data of the Y1 row line is 1, and the A4 column line data is 0. In this case, when the line horizontal data change amount of the Y1 row line is greater than or equal to the reference value, the change may be performed in the same manner as the A1 column line of the Y1 row line and A2. That is, the data of the A2 column line of the Y1 row line can be converted into the data value of the A1 column line, and conversely, the data of the A1 column line is converted into the data value of the A2 column line to perform the address power reduction process. In addition, it is a matter of course that the address power consumption reduction process can be performed not only in the dot pattern but also in the image in which the line horizontal data change amount of each row line is equal to or larger than the reference value.

In the embodiment of the present invention, the line vertical data change amount of each adjacent row line is detected, and address power consumption reduction process is performed according to the value thereof, and then the line horizontal data change amount of each row line is detected and the address power consumption according to the value. Reduction treatment can be performed. On the contrary, the line horizontal data change amount of each row line is detected and address power consumption reduction is performed according to the value, and the line vertical data change amount of each adjacent row line is detected again and the address power consumption reduction process is performed according to the value. It is also possible to carry out.

In this way, address power consumption can be further reduced by detecting not only the amount of change in the line vertical data of each adjacent row line but also the amount of change in the line horizontal data of each row line.

Meanwhile, in the exemplary embodiment of the present invention, the line vertical data change amount is detected by comparing the vertical data of two adjacent row lines for each subfield. By the way, it is also possible to divide the entire row line of one subfield into a plurality of groups and to detect the line vertical data change amount between the row lines for each group. For example, when the number of row lines of an arbitrary group is 4, the amount of change in line vertical data between two row lines may be respectively detected, and the amount of change in line vertical data may be added to calculate the amount of change in group data. In this way, the amount of data change can be detected in group units, and then address power consumption reduction processing can also be performed in group units. In other words, if the amount of change in the line vertical data of any group is equal to or greater than the reference value, the row line data of the group is converted to the same as that of the reference row line (which can be arbitrarily designated according to the total number of row lines in the group) to reduce the address power consumption. You can do it. As described above, when address reduction processing is performed in group units, there is an effect that address consumption can be further reduced.

Further, in the embodiment of the present invention, the above address power consumption reduction process is performed in all subfields, but it is also possible to perform the address power consumption reduction process only in the subfields for expressing low gray levels. When an image signal representing a relatively dark screen is input, a cell to be turned on is selected only in a subfield representing a low gray level. In this case, the human eye is increased even though the amount of data conversion is different from that of the original image signal. This is because they do not recognize this well. However, in an image signal representing relatively high luminance, when the amount of data conversion increases, the human eye may easily identify a screen breakup phenomenon. Therefore, it is also possible to perform the above address power consumption reduction process only in the subfields representing low gray scales (low weight values).

Although the preferred 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 exemplary embodiment of the present invention, the address power consumption is reduced in all images, and at the same time, the gray level expressive power and the luminance are controlled to ensure the original image level.

Claims (14)

A plasma display panel including a plurality of first electrodes and a plurality of second electrodes crossing the plurality of first electrodes, the plurality of discharge cells being formed by the plurality of first and second electrodes; A controller configured to control an image signal of one input frame to be driven by being divided into a plurality of subfields; And A driving unit driving the plasma display panel according to a control signal of the controller; The control unit, A subfield data generator for generating subfield data corresponding to the input image signal data of one frame; And From the subfield data, the data of each adjacent row line is compared in the column direction for each subfield, and a line vertical data change amount is detected. If the detected line vertical data change amount is equal to or greater than a reference value, the data of the adjacent row lines are equal to each other. And an address automatic power control unit for performing an address power reduction process for converting the data. The method of claim 1, The address automatic power control unit, A data change detection unit configured to detect vertical data change by comparing data of adjacent row lines of each subfield in the subfield data by the same column line, and generate a change amount of each line vertical data by adding the detected vertical data change amounts; A reference value generation unit for calculating the total vertical data change amount by adding all of the line vertical data change amounts for each subfield, and generating a reference value corresponding to the total vertical data change amount; And a data conversion control unit for comparing the line vertical data change amount and the reference value for each subfield, and converting data of the adjacent row lines equally to each other when the line vertical data change amount is equal to or greater than the reference value. . The method of claim 2, The reference value generator, And a look-up table storing reference values corresponding to the total vertical data change amount for each subfield. The method according to claim 2 or 3, The data change detection unit, A plasma display device for detecting the amount of change of the vertical data by comparing the data of the K-th row line and the data of the K + 1-th row line in each column for each subfield. The method of claim 4, wherein The data conversion control unit, And outputting data of the adjacent row lines as original data when the amount of change in the line vertical data is smaller than the reference value. The method of claim 5, The reference value generator, And a reference value of a subfield expressing a low gray level among the plurality of subfields is set to be relatively lower than a reference value of a subfield expressing a high gray scale when the reference value is generated. The method of claim 5, The address automatic power control unit, And the address power reduction process is performed only in the subfields representing low gray scales among the plurality of subfields. A method of driving a plasma display device including a plasma display panel in which a plurality of discharge cells are formed at a point where a plurality of row lines and a plurality of column lines cross each other, and controlling one frame into a plurality of subfields. Generating subfield data corresponding to the input image signal data of one frame; Detecting the line vertical data change amount by comparing the data of each adjacent row line in the column direction for each subfield in the subfield data; Comparing the detected line vertical data variation with a reference value; And And converting data of the adjacent row lines in the same manner when the detected line vertical data change amount is larger than the reference value. The method of claim 8, By comparing the data of the K th row line and the K + 1 th row line in each column direction for each subfield, the amount of change in each vertical data is detected, and the amount of change in each vertical data is added to the line vertical data of each adjacent row line. A driving method of a plasma display device for detecting a change amount. The method of claim 9, If the line vertical data change amount of the K th row line and the K + 1 th row line is larger than the reference value, the data of the K + 1 th row line is converted into the data of the K th row line, And maintaining the original data of the K and K + 1th row lines when the line vertical data change amount of the Kth and K + 1th row lines is smaller than the reference value. The method according to any one of claims 8 to 10, The reference value is set to a value corresponding to the total vertical data change amount for each subfield, And the total vertical data change amount is the sum of the vertical line data change amounts. The method of claim 11, The reference value is, A driving method of a plasma display device which is set relatively lower in a subfield expressing a low gradation than in a subfield expressing a high gradation. The method of claim 11, Plasma display field for detecting the line vertical data change amount between each adjacent row line only in the subfields representing low gray scale among the plurality of subfields, and converting the data between each adjacent row line according to the detected line vertical data change amount. How the tooth is driven. The method of claim 8, After data of the adjacent row lines are equally converted to each other, Detecting a change amount of line horizontal data for each row line in the converted data; And And converting data of adjacent column lines to be equal to each other when the detected line horizontal data change amount is a reference value or more.

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