KR100589409B1 - Plasma display panel and driving method thereof - Google Patents

Abstract

The present invention relates to a plasma display panel and a method thereof. The plasma display panel according to the present invention detects a sync signal input from a video unit to a logic unit, measures a period, determines whether a period of the sync signal is included in a normal operation range, And outputs a signal for controlling the operation of the plasma display panel to the driving unit in accordance with a predetermined sequence when it is determined that an abnormal synchronization signal is input. By doing so, it is possible to prevent the burn-out of the driving circuit and to eliminate the PDP image quality defect by detecting the input of the abnormal synchronization signal and performing the power-off sequence.

Plasma display panel, synchronous signal, off-sequence

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plasma display panel (PDP)

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

2 is an internal configuration diagram of an abnormal synchronization signal detecting apparatus according to an embodiment of the present invention.

3 is a diagram illustrating a frequency range of a normal synchronization signal according to a broadcasting system.

4 is a diagram illustrating an operation process of the abnormal synchronization signal detecting apparatus according to the embodiment of the present invention.

A plasma display panel (PDP) and a driving method thereof.

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 these flat panel display devices, the plasma display panel is advantageous in that luminance and luminous efficiency are higher than those of other flat panel display devices and the viewing angle is wide. Accordingly, the plasma display panel is attracting attention as a display device for replacing a conventional cathode ray tube (CRT) in a large display device of 40 inches or more.

2. Description of the Related Art A plasma display panel is a flat display device that displays characters or images by using a plasma generated by gas discharge, and several tens to several million or more pixels are arranged in a matrix form according to their sizes. Such a plasma display panel is classified into a direct current type and an alternating current type according to the type of a driving voltage waveform to be applied and the structure of a discharge cell.

In the direct current type plasma display panel, since the discharge space of the electrode is exposed without being insulated, the current flows through the discharge space while the voltage is applied. In order to do this, a resistor for current limitation is required. On the other hand, in the AC type plasma display panel, since the dielectric layer covers the electrode, the current is limited by the formation of a natural capacitance component, and the electrode is protected from the impact of the ion during discharging.

In order to satisfy the power factor condition, the power supply device for PDP is provided with a power factor correction (PFC) circuit (hereinafter referred to as PFC) circuit that receives power from the input AC power source to compensate the power factor and supplies stable power to the PDP do.

That is, when the AC rated voltage is inputted to the PDP power supply unit and the basic power supply is applied to each device, a signal for starting the PFC in the image processing unit (image unit), that is, a relay in the PDP power supply unit A signal for turning on the power is outputted to the PDP power supply unit.

Then, the PDP power supply outputs a video signal power, outputs power for the driver switch, and outputs driving power for driving the PDP so that the PDP can perform a normal operation.

On the other hand, in the operation of the PDP, if the sync signal Vsync applied to the logic unit from the video unit is input non-periodically or a sync signal is not inputted, a phenomenon such as burnout of the drive circuit and bad PDP picture quality And this is directly related to the fall of the product reliability.

SUMMARY OF THE INVENTION The present invention is directed to a plasma display panel that detects an abnormal sync signal input from a video unit to a logic unit and performs a predetermined power off sequence to prevent burnout of a driving circuit and to eliminate a PDP image quality defect, .

According to an aspect of the present invention, there is provided a plasma display panel comprising: a power supply unit for supplying power; A driving unit for driving the plasma display panel using a voltage and a current supplied from the power supply unit; A logic unit for outputting a signal for controlling the driving unit; A video unit for outputting video data to the logic unit according to an input signal; And a panel unit including a plurality of address electrodes and a plurality of first electrodes and second electrodes arranged to cross the address electrodes and displaying the output image data,

The logic unit includes:

A signal for controlling the plasma display panel to be inoperable according to a predetermined sequence is detected by detecting a synchronizing signal input from the image unit, measuring a period of the synchronizing signal to determine whether an abnormal synchronizing signal is inputted, And outputs an error detection signal to the error detection circuit.

The abnormal synchronization signal detecting apparatus includes:

A synchronizing signal detector for detecting a synchronizing signal input from the image unit; A period determination unit for measuring a period of the synchronization signal detected by the synchronization signal detection unit and determining whether the synchronization signal is an abnormal synchronization signal; And an off-sequence processor for outputting a signal for controlling the plasma display panel to be inoperative according to an output signal of the period determiner to the driver,

The period determination unit may determine,

If the period of the input synchronizing signal is not included in the normal operation range more than the predetermined number of times, it is judged to be an anomaly signal.

At this time, the normal operating range is preferably 60 2 Hz or 50 2 Hz.

Further, the off-

And outputs the normal data to the driving unit until the next synchronizing signal is input after the abnormal synchronizing signal is determined. When the next synchronizing signal is input, all the switches except for the switch for supplying the 0V voltage among the driving switches included in the driving unit And turns off the relay power of the power source unit.

According to an aspect of the present invention, there is provided a method of driving a plasma display panel including a power supply for supplying power, a driver for driving a plasma display panel using a voltage and a current supplied from the power supply, An image unit for outputting image data to the logic unit according to an input signal, a plurality of address electrodes, and a plurality of first electrodes and second electrodes arranged to cross the address electrodes, A method of driving a plasma display panel including a panel portion,

a) detecting a sync signal input from the image unit to the logic unit and measuring a period; b) determining whether a period of the synchronization signal is included in a normal operation range; And c) a signal for controlling the plasma display panel to be inoperable according to a predetermined sequence, when it is determined that an abnormal synchronization signal has been input when the synchronization signal whose period is not included in the normal operation range is inputted a predetermined number of times or more, .

The step c)

And outputs a control signal for normal operation to the driving unit until the next synchronizing signal is input at the determined time when it is determined that the abnormal synchronizing signal is inputted,

And outputs a control signal for controlling the voltage applied to the first and second electrodes to be 0 V to the driving unit and for turning off the relay power of the power unit to the power unit .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted. Like parts are designated with like reference numerals throughout the specification.

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

1, a plasma display panel device 100 according to an embodiment of the present invention includes a power source unit 100, a driving unit 200, an image unit 300, a logic unit 400, and a panel unit 500 . The logic unit 400 includes an abnormal synchronization signal detecting device 410. The driving unit 400 includes a Y driver 220 for generating a pulse to be applied to a scan electrode Y electrode, An X driver 210 for generating a pulse to be applied to the address electrode, and an address driver 230 for generating a pulse applied to the address electrode.

First, the power supply unit 100 supplies voltage and current of a predetermined size to the respective components such as the driving unit 200 of the plasma display panel, the video unit 300, the logic unit 400, and the panel unit 500 , The driving unit 200 drives the plasma display panel using the voltage and current supplied from the power supply unit 100.

The image unit 300 outputs image data and a control signal according to a signal input from the outside, and the logic unit 400 outputs image data including characters and images according to an output control signal. The panel unit 500 ) Restores the output image data.

In addition, the abnormal synchronization signal detecting apparatus 410 according to the embodiment of the present invention detects a synchronization signal Vsync input from the video unit 300 and determines an input period of the synchronization signal Vsync, And outputs the signal to the driving unit 200.

Next, the operation of the abnormal synchronization signal detecting apparatus 410 according to the embodiment of the present invention will be described in detail with reference to FIG. 2 to FIG.

FIG. 2 is an internal configuration diagram of the abnormal synchronization signal detecting apparatus 410 according to the embodiment of the present invention, FIG. 3 is a diagram showing a frequency range of a normal synchronization signal according to a broadcasting system, FIG. The operation of the abnormal synchronization signal detecting apparatus 410 according to the second embodiment of the present invention.

2, the apparatus for detecting an abnormal synchronization signal 410 according to the embodiment of the present invention includes a synchronization signal (Vsync) detector 411, a period determination unit 412, and an off-sequence processing unit 413 .

The synchronizing signal detector 411 detects a synchronizing signal among the signals input from the video unit 300. The period determiner 412 measures a time interval, i.e., a period, at which the synchronizing signal is input, As shown in FIG. If it is judged that the signal is abnormally input, the signal is outputted to the off-sequence processing unit 413, and the off-sequence processing unit 413 turns off the power of the PDP in a predetermined order.

The operation of the abnormal synchronization signal detecting apparatus 410 according to the embodiment of the present invention is as follows.

The synchronizing signal detecting unit 411 continuously detects a synchronizing signal input from the video unit 300 in step S400 and the period determining unit 412 measures the period of the detected synchronizing signal to determine whether it is an abnormal period or an abnormal period (S410).

The process of determining the abnormal synchronization signal in the period determination unit 412 will be described in detail as follows.

Generally, in the normal operation of the PDP, the frequency of the synchronization signal in the National Television Systems Committee (NTSC) system is 60 ± 2 Hz (the period is 16.13 to 17.24 ms), and the frequency of the synchronization signal in the PAL (Phase Alternation Line) 2 Hz (the period is 19.23 to 20.83 ms). FIG. 3 shows the frequency range of the synchronization signal during the normal operation.

Therefore, when the sync signal belonging to the PAL and NTSC areas of FIG. 3 is input, the cycle determiner 412 determines the normal operation of the PDP, and A (short cycle) and B (The range between PAL and NTSC) and C (long period or sync signal is not inputted) continuously is inputted for a predetermined number of times or more, it is judged as an abnormal sync signal and the off-sequence processing section 413 turns off And outputs a signal instructing sequence processing. Then, the off-sequence processing unit 413 turns off the power according to the determined order.

At this time, the off-sequence is as follows.

First, the reset, addressing, and sustain discharge pulses are continuously output (S420 to S430) until the next sync signal Vsync is input from the time when the sync signal is determined to be the sync signal. When the next sync signal Vsync is input, Only the switch for applying the GND voltage to the electrode is turned on, and all the driving switches except for this are turned off to turn off the output waveform (S440).

Then, the relay power supply of the power supply unit 100 is turned off so that no more power is supplied to the PDP (S450 to 460).

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited thereto, and various other changes and modifications may be made.

As described above, the abnormal sync signal detecting apparatus according to the present invention detects the input of the abnormal sync signal from the image unit and performs the power off sequence, thereby preventing the burnout of the drive circuit and eliminating the PDP image quality defect.

Claims (8)

A power supply for supplying power; A driving unit for driving the plasma display panel using a voltage and a current supplied from the power supply unit; A logic unit for outputting a signal for controlling the driving unit; A video unit for outputting video data to the logic unit according to an input signal; And And a panel unit including a plurality of address electrodes and a plurality of first electrodes and second electrodes arranged to cross the address electrodes and displaying the output image data, The logic unit includes: Wherein the control unit detects a synchronizing signal input from the image unit and measures a period of the synchronizing signal to determine whether or not an abnormality synchronizing signal has been input. When the abnormality synchronizing signal is input, And outputting a signal for controlling the plasma display panel to be inoperative if the next synchronization signal is input to the driving unit, And a plasma display panel. The method according to claim 1, The abnormal synchronization signal detecting apparatus includes: A synchronizing signal detector for detecting a synchronizing signal input from the image unit; A period determination unit for measuring a period of the synchronization signal detected by the synchronization signal detection unit and determining whether the synchronization signal is an abnormal synchronization signal; And And an off-sequence processor for outputting a signal for controlling the operation of the plasma display panel to the driving unit according to an output signal of the period determination unit, And a plasma display panel. 3. The method of claim 2, The period determination unit may determine, If the period of the input synchronizing signal is not included in the normal operation range more than the predetermined number of times, Plasma display panel. The method of claim 3, The normal operating range is 60 +/- 2 Hz or 50 +/- 2 Hz Plasma display panel. 5. The method of claim 4, Wherein the off- And outputs the normal data to the driving unit until the next synchronizing signal is inputted after the abnormal synchronizing signal is determined. When the next synchronizing signal is inputted, all the switches except for the switch which supplies the 0V voltage among the driving switches included in the driving unit And turns off the relay power of the power supply unit Plasma display panel. A driving unit for driving the plasma display panel using a voltage and a current supplied from the power supply unit, a logic unit for outputting a signal for controlling the driving unit, and a display unit for outputting image data to the logic unit And a panel unit including a plurality of address electrodes and a plurality of first electrodes and a plurality of second electrodes arranged to cross the address electrodes and displaying the output image data, As a result, a) detecting a sync signal input from the image unit to the logic unit and measuring a period; b) determining whether a period of the synchronization signal is included in a normal operation range; And c) if it is judged that an abnormal synchronization signal has been input when the synchronization signal which is not included in the normal operation range is inputted a predetermined number of times or more, and if it is judged that the abnormal synchronization signal has been inputted, And outputting a control signal for normal operation to the driving unit until the next synchronizing signal is input, and outputting a signal for controlling the plasma display panel to not operate when the next synchronizing signal is input And driving the plasma display panel. The method according to claim 6, In the step b) The normal operating range is 60 +/- 2 Hz or 50 +/- 2 Hz A method of driving a plasma display panel. The method according to claim 6, The step c) When the next synchronization signal is input, And outputs a control signal for controlling the voltage applied to the first and second electrodes to 0V to the driving unit and for turning off the relay power of the power unit to the power unit A method of driving a plasma display panel.

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