KR20050050508A - Plasma display panel and driving method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a driving method thereof. The present invention relates to a plasma display panel and a driving method thereof. The present invention relates to a plasma display panel and a driving method thereof. After predicting the driving current for each subfield from the driving signal, the predicted current is compared with the current detected by the current detector, and when the difference is greater than or equal to a predetermined value, the power applied to the plasma panel is cut off. In this way, the operation of the plasma display panel can be stopped when an abnormal operation current occurs, thereby preventing the plasma display panel from being burned out.

Description

Plasma display panel and driving method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly, to a plasma display panel and a driving method thereof capable of preventing damage to a set.

Recently, flat display devices such as a liquid crystal display (LCD), a field emission display (FED), and a plasma display panel have been actively developed. Among the flat panel display devices, the plasma display panel has advantages of higher luminance and luminous efficiency and wider viewing angle than other flat panel display devices. Accordingly, the plasma display panel is in the spotlight as a display device to replace the conventional cathode ray tube (CRT) in a large display device of 40 inches or more.

First, a structure of a general plasma display panel will be described with reference to FIG. 1.

1 is a partially exploded perspective view illustrating a structure of a general plasma display panel.

As shown in FIG. 1, the scan electrode 4 and the sustain electrode 5 covered with the dielectric layer 2 and the protective film 3 are arranged in parallel on the first glass substrate 1. A plurality of address electrodes 8 covered with the insulator layer 7 are provided on the second glass substrate 6. A partition 9 is formed on the insulator layer 7 between the address electrodes 8 in parallel with the address electrode 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both side surfaces of the partition wall 9. The first glass substrate 1 and the second glass substrate 6 have a discharge space 11 therebetween so that the scan electrode 4 and the address electrode 8 and the sustain electrode 5 and the address electrode 8 are orthogonal to each other. They are arranged to face each other. The discharge space at the intersection of the address electrode 8 and the pair of the scanning electrode 4 and the sustain electrode 5 forms a discharge cell 12.

FIG. 2 is a diagram schematically illustrating an arrangement of electrodes of the plasma display panel of FIG. 1.

As shown in FIG. 2, the electrodes of the plasma display panel have a matrix configuration of m × n. Specifically, the address electrodes A1 to Am are arranged in the column direction and the scan electrodes of n rows in the row direction. (Y1 to Yn) (hereinafter referred to as Y electrode) and sustain electrodes X1 to Xn (hereinafter referred to as X electrode) are alternately arranged. That is, the X electrodes X1 to Xn and the Y electrodes Y1 to Yn are formed in a predetermined pattern on the back of the first glass substrate 1 to be orthogonal to the address electrodes A1 to Am. Discharge cells 12 are formed at each crossing point. The plasma forming gas is sealed in the discharge space of the discharge cell 12 and discharged by a pulse applied to the three electrodes to display an image.

As a method of driving the plasma display panel 1 having the above structure, an address and display period separated (ADS) driving method in which a subfield is driven by being divided into a reset period, an address period, and a sustain period is disclosed in the United States. It is disclosed in patent no.

3 is a view showing a driving waveform of a subfield of the plasma display panel used in the address-display separation driving method.

As shown in Fig. 3, each subfield is composed of a reset period, an address period, and a sustain period. The reset period serves to erase the wall charge state of the previous sustain discharge and to set up wall charge in order to stably perform the next address discharge.

Here, the wall charges refer to electric charges formed on the walls of the discharge cells (eg, dielectric layers) close to each electrode and accumulated in the electrodes. Such wall charges are not actually in contact with the electrodes themselves, but here wall charges are described as "formed", "accumulated" or "stacked" on the electrodes. In addition, the wall voltage refers to a potential difference formed on the wall of the discharge cell by the wall charge.

The address period is a period in which wall charges are accumulated on cells (addressed cells) that are turned on by selecting cells that are turned on and cells that are not turned on in the panel. The sustain period is a period in which a discharge for actually displaying an image on the addressed cells is performed.

Since the current of the sustain discharge voltage portion for driving such a plasma display panel has a large amount of current itself and a large peak, the allowable value itself in the circuit also becomes large.

However, when the screen is turned on in a situation where the driving circuit should not be turned on due to the operation of the driving circuit, the power is greatly increased due to the sustain discharge and the power consumption is increased. At this time, the current flowing does not exceed the allowable value inside the circuit. Therefore, there is a problem that can not prevent the abnormal operation of such a circuit by using a simple fuse.

In particular, the number of sustain discharges is greatly increased in an image condition in which maximum light is emitted in consideration of power consumption due to a small image load itself. In this case, the entire screen may be turned on by abnormal operation of the set. .

In this case, the number of sustain discharges is greatly increased and the load on the screen is also very large, so that the power consumption set in the set is greatly exceeded. However, based on the individual pulses of sustain discharge, the current is below the allowable instantaneous current that can flow in the set, so it is determined to be a normal state and continuously performs a malfunction. If such a malfunction persists, there is a problem that the circuit inside the set is broken.

The technical problem of the present invention for solving the above problems is to detect the sustain discharge current flowing inside the plasma display panel set, predict the sustain discharge current based on the input image data, predict the sustain discharge current and the detected actual When the two values are different by comparing the currents, the operation of the plasma display panel is stopped to prevent burnout of the plasma display panel.

The plasma display panel according to an aspect of the present invention for solving the above technical problem,

A plasma display panel that receives externally input image data and displays data.

A plasma panel including a plurality of address electrodes, a plurality of scan electrodes, and a sustain electrode;

An address data driver for applying a voltage corresponding to an address electrode driving signal to the address electrode;

A sustain electrode driver for applying a voltage corresponding to the sustain electrode driving signal to the sustain electrode;

A scan electrode driver for applying a voltage corresponding to the scan electrode driving signal to the scan electrode;

A power supply unit for supplying power to each unit;

A current detector for detecting an output current of the power supply device;

Receives the image signal, generates and outputs the scan electrode driving signal, the sustain electrode driving signal, and the address electrode driving signal, predicts the driving current for each subfield from the address driving signal, and predicts the current and the current detector. And a control unit for outputting a control signal to the scan electrode driver, the sustain electrode driver, and the address electrode driver to cut off the power applied to the plasma panel when the current detected by the difference is greater than or equal to a predetermined value.

The driving method of the plasma display panel according to another aspect of the present invention for solving the above technical problem,

A power supply is supplied by a power supply device, and includes a plurality of address electrodes, a plurality of scan electrodes and a sustain electrode.

Detecting an output current of the power supply;

Receiving an external image signal to generate and output a scan electrode driving signal, a sustain electrode driving signal, and an address electrode driving signal;

Estimating a driving current for each subfield from the address driving signal;

And comparing the predicted current with the current detected by the current detector, and if the difference is greater than or equal to a predetermined value, cutting off the power applied to the plasma panel.

DETAILED DESCRIPTION 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. When a part is connected to another part, this includes not only a direct connection but also a connection between other components in between.

A plasma display panel 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.

4 is a configuration diagram of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 4, the plasma display panel according to the embodiment of the present invention may include a plasma panel 100, a controller 200, an address electrode driver 300, and a scan electrode driver (hereinafter referred to as a “Y electrode driver”) ( 400 and a sustain electrode driver (hereinafter referred to as an 'X electrode driver') 500, a power supply device 600, and a current detector 700.

The plasma panel 100 includes a plurality of address electrodes A1-Am arranged in the column direction, a plurality of sustain electrodes (hereinafter referred to as 'X electrodes') (X1-Xn) and scan electrodes arranged in the row direction. (Hereinafter referred to as 'Y electrode') (Y1-Yn). The X electrodes X1-Xn are formed corresponding to the respective Y electrodes Y1-Yn, and generally have one end connected in common to each other. The plasma panel 100 includes a glass substrate (not shown) on which the X and Y electrodes X1-Xn and Y1-Yn are arranged, and a glass substrate (not shown) on which the address electrodes A1-Am are arranged. . The two glass substrates are disposed to face each other with the discharge space therebetween so that the Y electrodes Y1-Yn and the address electrodes A1-Am and the X electrodes X1-Xn and the address electrodes A1-Am are orthogonal to each other. At this time, the discharge space at the intersection of the address electrodes A1-Am and the X and Y electrodes X1-Xn and Y1-Yn forms a discharge cell.

The address electrode driver 300 receives an address electrode driving signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1-Am.

The X electrode driver 500 receives an X electrode driving signal from the controller 200 and applies a driving voltage to the X electrodes X1 to Xn.

The Y electrode driver 400 receives the Y electrode driving signal from the controller 200 and applies a driving voltage to the Y electrodes Y1-Yn.

The power supply device 600 supplies power to each part. The current detector 700 detects the output current of the power supply device 600. The controller 200 receives the image signal, generates and outputs the scan electrode driving signal, the sustain electrode driving signal, and the address electrode driving signal, predicts the driving current for each subfield from the address driving signal, and predicts When the current and the current detected by the current detector are compared and the difference is greater than or equal to a predetermined value, a control signal is output to the scan electrode driver, sustain electrode driver and address electrode driver to cut off the power applied to the plasma panel.

FIG. 5 is a detailed configuration diagram of the control unit of FIG. 4.

Referring to Figure 5, the control unit 200,

A gamma correction unit 210 which receives the image signal and corrects and outputs the gamma correction;

A power controller 220 generating and outputting the scan electrode driving signal and the sustain electrode driving signal according to the load ratio of the gamma corrected image data;

A subfield data generator 230 generating the gamma corrected image data as subfield data and outputting the gamma corrected image data as the address electrode driving signal;

A memory 240 for storing a current value corresponding to on data of each subfield;

A sub-field current predictor 250 for predicting a sub-field driving current from an address driving signal with reference to the memory;

When the difference between the predicted current and the current detected by the current detector is greater than or equal to a predetermined value, a control signal is output to the scan electrode driver, sustain electrode driver, and address electrode driver to cut off power applied to the plasma panel. Comparing unit 260 is included.

The operation of the plasma display panel according to the exemplary embodiment of the present invention having the above configuration will now be described.

First, when the power switch is turned on by the user, the power supply device 600 supplies power to each part of the plasma display panel.

Then, the gamma correction unit 210 receives the image signal and gamma corrects and outputs the image signal.

The power controller 220 generates and outputs the scan electrode driving signal and the sustain electrode driving signal according to the load ratio of the gamma corrected image data, and the subfield data generator 230 subtracts the gamma corrected image data. The field data is generated and output as an address electrode driving signal.

Then, the address electrode driver 300 receives the address electrode drive signal from the controller 200 and applies a display data signal for selecting the discharge cells to be displayed to each address electrode A1-Am, and the X electrode driver The 500 receives the X electrode driving signal from the control unit 200 to apply a driving voltage to the X electrodes X1 to Xn, and the Y electrode driving unit 400 receives the Y electrode driving signal from the control unit 200 to Y. A driving voltage is applied to the electrodes Y1-Yn.

Then, the corresponding image data is displayed on the plasma panel 100.

On the other hand, the memory 240 stores a current value corresponding to the data turned on for each subfield, and the current predictor 250 predicts the drive current for each subfield from the address driving signal with reference to the memory 240 to compare the result. Output to (260). At this time, the current value corresponding to the on-data for each subfield stored in the memory 240 is stored in the form of a lookup table obtained by an experiment.

On the other hand, the current detector 700 detects the output current of the power supply device 600 and outputs it to the comparator 260.

Then, the comparator 260 compares the predicted current with the current detected by the current detector 700 and if the difference is greater than or equal to a predetermined value, the address electrode driver 300, the Y electrode driver 400, and X. The driving signal applied to the plasma panel 100 from the electrode driver 500, that is, the control signal is output so that power is cut off. At this time, if necessary, the comparator 260 may control the power supply device 600 to cut off the power.

In this way, when the current prediction value and the measured actual current are more than a certain difference, the power supply can be cut off to prevent burnout of the circuit.

Although the present invention has been described above based on the embodiments, the embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, and the like can be made to the embodiments without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all changes or modifications.

As described above, in the embodiment of the present invention, the sustain discharge current flowing inside the plasma display panel set is detected, the sustain discharge current is predicted based on the input image data, and the predicted sustain discharge current and the detected actual current are When the two values are different from each other, a plasma display panel and a driving method thereof capable of preventing burnout of the plasma display panel by stopping the operation of the plasma display panel can be provided.

1 is a partially exploded perspective view illustrating a structure of a general plasma display panel.

FIG. 2 is a diagram schematically illustrating an arrangement of electrodes of the plasma display panel of FIG. 1.

FIG. 3 is a diagram illustrating driving waveforms of a subfield of a plasma display panel having three electrodes.

4 is a configuration diagram of a plasma display panel according to an exemplary embodiment of the present invention.

5 is a detailed view of the controller of FIG. 4.

Claims (8)

A plasma display panel that receives externally input image data and displays data. A plasma panel including a plurality of address electrodes, a plurality of scan electrodes, and a sustain electrode; An address data driver for applying a voltage corresponding to an address electrode driving signal to the address electrode; A sustain electrode driver for applying a voltage corresponding to the sustain electrode driving signal to the sustain electrode; A scan electrode driver for applying a voltage corresponding to the scan electrode driving signal to the scan electrode; A power supply unit for supplying power to each unit; A current detector for detecting an output current of the power supply device; Receives the image signal, generates and outputs the scan electrode driving signal, the sustain electrode driving signal, and the address electrode driving signal, predicts the driving current for each subfield from the address driving signal, and predicts the current and the current detector. And a control unit for outputting a control signal to the scan electrode driver, the sustain electrode driver, and the address electrode driver to cut off the power applied to the plasma panel when the current detected by the difference is greater than or equal to a predetermined value. panel. The method of claim 1, The control unit, A gamma correction unit which receives the image signal and corrects and outputs the gamma correction; A power controller configured to generate and output the scan electrode driving signal and the sustain electrode driving signal according to the load ratio of the gamma corrected image data; A subfield data generator configured to generate the gamma corrected image data as subfield data and output the subfield data as the address electrode driving signal; A memory for storing a current value corresponding to on data for each subfield; A sub-field current predictor for predicting a sub-field driving current from an address driving signal with reference to the memory; When the difference between the predicted current and the current detected by the current detector is greater than or equal to a predetermined value, a control signal is output to the scan electrode driver, sustain electrode driver, and address electrode driver to cut off power applied to the plasma panel. A plasma display panel comprising a comparator. The method of claim 2, And a current value corresponding to the turned-on data for each subfield stored in the memory is stored in the form of a look-up table. A plasma display panel that receives externally input image data and displays data. A plasma panel including a plurality of address electrodes, a plurality of scan electrodes, and a sustain electrode; An address data driver for applying a voltage corresponding to an address electrode driving signal to the address electrode; A sustain electrode driver for applying a voltage corresponding to the sustain electrode driving signal to the sustain electrode; A scan electrode driver for applying a voltage corresponding to the scan electrode driving signal to the scan electrode; A power supply unit for supplying power to each unit; A current detector for detecting an output current of the power supply device; Receives the image signal, generates and outputs the scan electrode driving signal, the sustain electrode driving signal, and the address electrode driving signal, predicts the driving current for each subfield from the address driving signal, and predicts the current and the current detector. And a controller which compares the current detected by and outputs a control signal to the power supply device to cut off the power applied to the plasma panel when the difference is greater than or equal to a predetermined value. The method of claim 4, wherein The control unit, A gamma correction unit which receives the image signal and corrects and outputs the gamma correction; A power controller configured to generate and output the scan electrode driving signal and the sustain electrode driving signal according to the load ratio of the gamma corrected image data; A subfield data generator configured to generate the gamma corrected image data as subfield data and output the subfield data as the address electrode driving signal; A memory for storing a current value corresponding to on data for each subfield; A sub-field current predictor for predicting a sub-field driving current from an address driving signal with reference to the memory; And a comparator for comparing a predicted current with a current detected by the current detector, and outputting a control signal to the power supply device to cut off power applied to the plasma panel when the difference is greater than or equal to a predetermined value. A power supply is supplied by a power supply device, and includes a plurality of address electrodes, a plurality of scan electrodes and a sustain electrode. Detecting an output current of the power supply; Receiving an external image signal to generate and output a scan electrode driving signal, a sustain electrode driving signal, and an address electrode driving signal; Estimating a driving current for each subfield from the address driving signal; And comparing the predicted current with the current detected by the current detector and shutting off the power applied to the plasma panel when the difference is greater than or equal to a predetermined value. The method of claim 6, And a scan electrode driving signal, a sustain electrode driving signal, and an address electrode driving signal to turn off the power applied to the plasma panel. The method of claim 6, And a control signal outputting power to the power supply device to cut off power applied to the plasma panel.