KR20050108999A - Device and method for driving plasma display panel - Google Patents

Abstract

The present invention relates to a driving apparatus and a driving method of a plasma display panel, and more particularly, to a driving apparatus and a driving method of a plasma display panel capable of minimizing a load effect.

In the driving apparatus of a plasma display panel including a data electrode driver for driving a data electrode and a scan electrode driver for driving a scan electrode, the driving apparatus of the plasma display panel according to the present invention calculates a load amount of a corresponding line. The driving controller outputs a signal corresponding to the variable amount of the scan voltage according to the load amount per line, the converter unit for outputting a voltage corresponding to the variable amount of the scan voltage according to the signal corresponding to the variable amount of the scan voltage and the scan voltage And a voltage applying unit configured to apply a variable scan voltage to the scan electrode driver by adding a bias voltage to a voltage corresponding to the variable amount so that the variable scan voltage is applied to the corresponding line.

The present invention can minimize the luminance difference due to the load effect phenomenon by varying the scan voltage or the data voltage by calculating the load amount for each line.

Description

Device and method for driving plasma display panel {Device and Method for Driving Plasma Display Panel}

The present invention relates to a driving apparatus and a driving method of a plasma display panel, and more particularly, to a driving apparatus and a driving method of a plasma display panel capable of minimizing a load effect.

1 is a view for explaining a method of driving a general plasma display panel. As shown in FIG. 1, in order to drive a plasma display panel using a subfield, one frame time is composed of n subfields, and each subfield has a reset period and an address. It is divided into intervals and sustain intervals. In FIG. 1, the number of subfields is eight, and the reset section and the address section are displayed as one section. In order to express gradation, the sustain intervals of each subfield are assigned different weights, and gradation is expressed by an appropriate combination of the weights. The weight is the number of sustain pulses for the sustain period included in each subfield.

In order to improve the luminance and image quality while expressing 256 gray levels in eight subfields SF1 to SF8, the number of sustain pulses allocated to each subfield must be increased. However, as the number of sustain pulses increases on all screens, power consumption of the plasma display panel increases, causing damage to the plasma display panel and driving m being unstable. Therefore, the driving apparatus of the plasma display panel should adjust the number of sustain pulses according to the image information.

2 is a graph showing a relationship between an average picture level (APL) value and the number of sustain pulses. When the dark screen, that is, the APL value is small, the driving device of the plasma display panel increases the number of sustain pulses allocated to the sustain period of the subfield to increase the contrast. In addition, when the bright screen, that is, the APL value is large, the driving device of the plasma display panel reduces the number of sustain pulses allocated to the sustain period of the subfield to prevent damage to the panel. However, even if the same number of sustain pulses is used, the larger the area displayed on the screen, the lower the brightness is.

3 is a view for explaining a load effect phenomenon.

If the area (region A) of the turned-on cell of the plasma display panel on the left side is larger than the area (region B) of the turned-on cell of the plasma display panel on the right side, and if the same sustain pulse is applied to the cells of the region A and the region B, The brightness of area A is darker than area B.

This is because, when turning on the cells of the area A and the cells of the area B using the same number of sustain pulses, more power is consumed to turn on the cells of the area A than the area of the B area.

The conventional load effect removal method attempts to solve the load effect by calculating the area of the turned-on cell by using an image signal of one frame input from the outside. However, the conventional method of solving the load effect using the area has a problem that can not prevent the phenomenon that the brightness varies depending on the position of the areas of the same area.

4 is a view for explaining the problem of the conventional method for removing the load effect.

The load effect phenomenon is the difference in luminance when the area of the turned-on cells is different, but more precisely, the number of cells turned on during the addressing process of one line, that is, the luminance when the load is large. Is less than the luminance when less.

When the same number of sustain pulses are allocated, the conventional load effect removing method removes the load effect phenomenon when the areas of the turned-on cells are the same as in the a region, the b region, the c region, and the d region, as shown in FIG. Can not.

However, even if the areas of the a, b, c, and d regions are the same, the luminance of the a and d regions is greater than that of the b and c regions. This is because, from the point of view of the line, the number of turned on cells on the lines corresponding to the regions a and d is smaller than the number of turned on cells on the lines corresponding to the regions b and c.

That is, since the width 1 (w1) is smaller than the width 2 (w2), from the viewpoint of the line, the load of the line corresponding to the a region and the d region is smaller than the load of the line corresponding to the region b and the region c. The luminance of the region d is greater than the luminance of the regions b and c.

Therefore, the conventional method of removing the load effect does not solve the load effect phenomenon appearing in such a case.

The present invention is to solve the above problems, and to provide a driving apparatus and a driving method of the plasma display panel that can adjust the voltage of the scan electrode for each line to reduce the load effect.

In order to achieve the above object, a plasma display panel driving apparatus including a data electrode driving unit for driving a data electrode and a scan electrode driving unit for driving a scan electrode, wherein the driving apparatus of the plasma display panel according to the present invention is a corresponding line. A driving control unit for calculating a load amount of the circuit and outputting a signal corresponding to the variable amount of the scan voltage according to the load amount of each line, and outputting a voltage corresponding to the variable amount of the scan voltage according to the signal corresponding to the variable amount of the scan voltage And a voltage applying unit configured to apply a variable scan voltage to the scan electrode driver by adding a bias voltage to a voltage corresponding to a variable amount of the converter unit and the scan voltage so that the variable scan voltage is applied to the corresponding line.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a graph illustrating a change in scan voltage that varies with line-by-line loads according to the present invention.

The driving method of the plasma display panel according to the present invention, unlike the conventional method of calculating and correcting the load by area, corrects the load effect according to the line where the addressing process is performed, that is, the load of the scan electrode.

In the method of driving the plasma display panel according to the present invention, the luminance according to the load effect is varied by varying the voltage difference between the data voltage Vdata applied to the address electrode by varying the scan voltage Vscan applied to the scan electrode according to the load amount per line. To compensate.

In other words, the driving method of the plasma display panel according to the present invention compensates the luminance according to the load effect by increasing the luminance of the selected cell by increasing the voltage difference between the scan voltage and the data voltage as the load per line increases.

The driving method of the plasma display panel according to the present invention compensates the luminance according to the load effect differently for each line, thereby more accurately removing the load effect than the conventional method.

In this case, the scan voltage Vscan is a voltage applied to the corresponding line in the addressing process and the data voltage Vdata is a voltage applied to the data electrode of the cell to be turned on among the cells on the corresponding line. In addition, Vvias illustrated in FIG. 5 is a voltage serving as a variable reference point of the scan voltage Vscan.

In the graph of FIG. 5, only the scan voltage Vscan may be varied, but the data difference Vdata may be varied together with the scan voltage Vscan to adjust the voltage difference to compensate for the load effect according to the load per line.

6 is a block diagram of a driving apparatus of a plasma display panel according to a first embodiment of the present invention. As shown in FIG. 6, the driving apparatus of the plasma display panel according to the first exemplary embodiment of the present invention includes a driving controller 610, a D / A converter 630, and a voltage applying unit 650.

<Drive control section>

The driving controller 610 calculates a load amount for each line and outputs a digital signal corresponding to a variable amount of the scan voltage Vscan according to the load amount for each line.

<D / A converter section>

The D / A converter 630 outputs a voltage Vdac corresponding to the variable amount of the scan voltage Vscan according to the digital signal corresponding to the variable amount of the scan voltage Vscan.

<Voltage application part>

The voltage applying unit 650 adds the bias voltage Vvias to the voltage Vdac corresponding to the variable amount of the scan voltage Vscan and applies the variable scan voltage Vscan to the scan electrode driver 670 so that the variable scan voltage Vscan is applied to the corresponding line. To be authorized.

As shown in FIG. 6, the driving controller includes a line memory unit 611, a frame memory unit 612, a data processor 613, a subfield mapping unit 614, a data alignment unit 615, and a load effect compensator ( 616).

The line memory unit 611 temporarily stores data of an image signal corresponding to one line.

The frame memory unit 612 continuously stores data corresponding to one line input from the line memory unit 611 to temporarily store data corresponding to one frame.

The data processor 613 receives data corresponding to one frame from the frame memory unit 612 and performs inverse gamma correction, gain adjustment, and half toning operations.

The subfield mapping unit 614 maps a corresponding subfield according to data corresponding to one frame input from the data processing unit 613.

The data alignment unit 615 rearranges data corresponding to one frame to which the subfields are mapped, for each subfield and outputs the data to the data electrode driver 680.

The load effect compensator 616 receives data corresponding to one line from the line memory unit 611, calculates a load amount for each line, and outputs a digital signal corresponding to a variable amount of the scan voltage Vscan according to the load amount for each line. Output to the / A converter 630.

The driving device of the plasma display panel may minimize the load effect by varying the scan voltage Vscan by calculating the load amount for each line.

7 is a block diagram illustrating a driving apparatus of a plasma display panel according to a second exemplary embodiment of the present invention. As shown in FIG. 7, the driving apparatus of the plasma display panel according to the second exemplary embodiment of the present invention includes a driving controller 710, a first D / A converter 730, a first voltage applying unit 750, and a second device. The 2D / A converter 770 and the second voltage applying unit 790 are included.

<Drive control section>

The driving controller 710 calculates a load amount for each line and outputs a first digital signal corresponding to a variable amount of the scan voltage Vscan and a second digital signal corresponding to a variable amount of the data voltage Vdata according to the load amount for each line.

<First D / A converter section>

The first D / A converter 730 outputs a voltage Vdac1 corresponding to a variable amount of the scan voltage Vscan according to the first digital signal.

<First voltage application section>

The first voltage applying unit 750 applies the variable scan voltage Vscan to the scan electrode driver 810 by adding the bias voltage Vvias1 to the voltage Vdac1 corresponding to the variable amount of the scan voltage Vscan to the scan electrode driver 810 to change the scan voltage to the corresponding line. Allow Vscan to be applied.

<2nd D / A converter part>

The second D / A converter 770 outputs a voltage Vdac2 corresponding to a variable amount of the data voltage Vdata according to the second digital signal.

<Second voltage applying section>

The second voltage applying unit 790 adds the bias voltage Vvias2 to the voltage Vdac2 corresponding to the variable amount of the data voltage Vdata and applies the variable data voltage Vdata to the data electrode driver 830 to exist on the corresponding line. The variable data voltage Vdata is applied to the cell.

As shown in FIG. 7, the driving controller includes a line memory unit 711, a frame memory unit 712, a data processor 713, a subfield mapping unit 714, a data alignment unit 715, and a load effect compensator ( 716).

The line memory unit 711 temporarily stores data of an image signal corresponding to one line.

The frame memory unit 712 continuously stores data corresponding to one line input from the line memory unit 711 to temporarily store data corresponding to one frame.

The data processor 713 receives data corresponding to one frame from the frame memory unit 712 and performs inverse gamma correction, gain adjustment, and half toning operations.

The subfield mapping unit 714 maps the subfields according to data corresponding to one frame input from the data processing unit 713.

The data aligner 715 rearranges data corresponding to one frame to which the subfields are mapped for each subfield and outputs the data to the data electrode driver 830.

The load effect compensator 716 receives data corresponding to one line from the line memory unit 711, calculates a load amount for each line, and then uses a first digital signal corresponding to a variable amount of the scan voltage Vscan according to the load amount for each line. Is output to the first D / A converter 730 and the second digital signal corresponding to the variable amount of the data voltage Vdata is output to the second D / A converter 770.

The driving apparatus of the plasma display panel may minimize the load effect by calculating the load amount for each line and simultaneously changing the scan voltage Vscan and the data voltage Vdata.

At this time, the variable amounts Vdac and Vdac1 of the scan voltages Vscan of the first and second embodiments of the present invention should be within a margin range that does not cause erroneous discharge, and are adjusted according to the load amount for each line.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the present invention can minimize the luminance difference due to the load effect phenomenon by varying the scan voltage or the data voltage by calculating the load amount for each line.

1 is a view for explaining a method of driving a general plasma display panel.

2 is a graph showing the relationship between the APL value and the number of sustain pulses.

3 is a view for explaining a load effect phenomenon.

4 is a view for explaining the problem of the conventional method for removing the load effect.

5 is a graph illustrating a change in scan voltage that varies with line-by-line loads according to the present invention.

6 is a block diagram of a driving apparatus of a plasma display panel according to a first embodiment of the present invention.

7 is a block diagram illustrating a driving apparatus of a plasma display panel according to a second exemplary embodiment of the present invention.

Claims (11)

In the driving apparatus of the plasma display panel comprising a data electrode driver for driving the data electrode and a scan electrode driver for driving the scan electrode, A driving controller which calculates a load amount of a corresponding line and outputs a signal corresponding to a variable amount of scan voltage according to the load amount of each line; A converter configured to output a voltage corresponding to a variable amount of the scan voltage according to a signal corresponding to the variable amount of the scan voltage; And Driving a plasma display panel including a voltage applying unit configured to apply a variable scan voltage to the scan electrode driver by adding a bias voltage to a voltage corresponding to the variable amount of the scan voltage to apply the variable scan voltage to the corresponding line. Device. The method of claim 1, The drive control unit, a) a line memory unit for temporarily storing data of an image signal corresponding to one line; b) temporarily storing data corresponding to one line input from the line memory unit to temporarily store data corresponding to one frame. A frame memory unit for storing the data; c) a data processor which receives data corresponding to one frame from the frame memory unit and performs inverse gamma correction, gain adjustment, and half-toning operation, and d) one frame input from the data processor. A subfield mapping unit for mapping the corresponding subfields according to the data corresponding to the data; e) a data alignment unit for rearranging data corresponding to one frame to which the subfields are mapped for each subfield and outputting the data to the data electrode driver; and f) The load amount is calculated for each line by receiving data corresponding to one line from the line memory unit. The driving device of the plasma display panel; and a digital signal corresponding to the variation amount of the scan voltage load effect compensation unit configured to output to the D / A converter in accordance with the line-by-line the load amount. The method of claim 1, And the variable amount of the scan voltage is within a margin range that does not cause erroneous discharge. In the driving apparatus of the plasma display panel comprising a data electrode driver for driving the data electrode and a scan electrode driver for driving the scan electrode, A driving controller calculating a load amount for each line and outputting a first signal corresponding to a variable amount of the scan voltage and a second signal corresponding to a variable amount of the data voltage according to the load amount for each line; A first converter unit outputting a first voltage corresponding to a variable amount of the scan voltage according to the first signal; A first voltage applying unit configured to apply a variable scan voltage to the scan electrode driver by adding a first bias voltage to the first voltage to apply a variable scan voltage Vscan to a corresponding line; A second converter configured to output a second voltage corresponding to a variable amount of a data voltage according to the second signal; And And a second voltage applying unit configured to apply a variable data voltage to the data electrode driver by adding a second bias voltage to the second voltage to apply the variable data voltage to a cell on the corresponding line. The drive unit of the panel. The method of claim 4, wherein The drive control unit, a) a line memory unit for temporarily storing data of an image signal corresponding to one line; b) temporarily storing data corresponding to one line input from the line memory unit to temporarily store data corresponding to one frame. A frame memory unit for storing the data; c) a data processor which receives data corresponding to one frame from the frame memory unit and performs inverse gamma correction, gain adjustment, and half-toning operation, and d) one frame input from the data processor. A subfield mapping unit for mapping the corresponding subfields according to the data corresponding to the data; e) a data alignment unit for rearranging data corresponding to one frame to which the subfields are mapped for each subfield and outputting the data to the data electrode driver; f) The load amount is calculated for each line by receiving data corresponding to one line from the line memory unit. W drive device of a plasma display panel in accordance with the line-by-line the load amount is output to the first converter to the first signal; and a second signal of the second converter load effect compensation for output to the call. The method of claim 4, wherein And the variable amount of the scan voltage is within a margin range that does not cause erroneous discharge. A driving method of a plasma display panel for driving a plasma display panel through a data electrode driver and a scan electrode driver. Calculating a load amount of a corresponding line; Determining a variable amount of a scan voltage according to the load amount of the corresponding line; And applying a variable scan voltage to the scan electrode driver by adding a first bias voltage to the variable amount of the scan voltage. The method of claim 7, wherein Determining the variable amount of the scan voltage, Outputting a signal corresponding to a variable amount of the scan voltage according to the load amount of the corresponding line, and outputting a voltage corresponding to the variable amount of the scan voltage according to a signal corresponding to the variable amount of the scan voltage. And a plasma display panel driving method. The method of claim 7, wherein Determining a variable amount of the data voltage according to the load amount of the corresponding line, and applying a variable data voltage to the data electrode driver by adding a second bias voltage to the variable amount of the data voltage. A drive method of a plasma display panel. The method of claim 9, Determining the variable amount of the data voltage, Outputting a signal corresponding to the variable amount of the data voltage according to the load amount of the corresponding line; and outputting a voltage corresponding to the variable amount of the data voltage according to the signal corresponding to the variable amount of the data voltage. And a plasma display panel driving method. The method of claim 7, wherein And the variable amount of the scan voltage is within a margin range that does not cause erroneous discharge.