KR100739551B1 - Apparatus and method for controlling of plasma display panel - Google Patents

Abstract

The present invention provides a device and method for driving a plasma display panel that detects and stores a synchronization and noise signal from an input signal at an ADC level, recognizes a weak electric field above a specific level, and reduces output sustain data to perform a low power mode. It is about. The present invention detects a synchronization signal and a noise signal from an input signal; Converting and storing the detected sync signal and noise signal into an ADC level, and determining a current input field as a weak electric field when the ADC level is equal to or more than a predetermined level; Outputting a drive signal in a low power mode by reducing an output signal when the current input field is a weak electric field in this step; The screen is displayed according to the driving signal. When the low power mode is driven, the number of sustain data output to the display panel is reduced. In addition, when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal, the current input field is determined as a weak electric field. Accordingly, the power sustain mode is reduced by reducing the output sustain data during the weak electric field, thereby reducing the power consumption by reducing the number of discharges, thereby preventing the deterioration of the driving IC and the cell, thereby extending the life of the parts and the PDP.

Plasma Display Panel, Sync Signal, Noise Signal, ADC, Weak Field, Power Saving

Description

Apparatus and method for controlling of plasma display panel

1 is a perspective view showing a discharge cell structure of a conventional plasma display panel.

2 is a view showing a driving waveform for driving a conventional plasma display panel.

3 and 4 are control block diagrams showing a driving apparatus of a conventional plasma display panel.

5 is a control block diagram showing a driving device of the plasma display panel according to the present invention;

6 is a control flowchart illustrating a method of driving a plasma display panel according to the present invention;

<Description of Symbols for Major Parts of Drawings>

100: RF signal input unit 200: Image signal processing unit

210: decoder 220: scaler

300: display panel 400: signal detector

500 control unit 600 storage unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to an apparatus for driving a plasma display panel at the time of inputting an RF weak field signal of an analog TV built-in model of a plasma display panel (hereinafter, referred to as PDP); It's about how.

Recently, a variety of devices such as CRT, projection TV, LCD, and PDP have been developed and used for digital image display. Among such flat panel display devices such as LCDs and PDPs, the thickness of the flat panel display device can be considerably thinner than that of a CRT or a projection method.

Looking at the light emission principle of the PDP, a pulse-like potential difference is formed between the X electrode and the Y electrode to generate a discharge, and the vacuum ultraviolet rays generated during the discharge process and the phosphor of RGB react to generate light. The discharge at this time will be affected by various parameters, but it is particularly related to the type and pressure of the discharge gas inside the PDP, and the secondary electron emission characteristics of the MgO protective film, and depends on the structure and driving conditions of the electrode.

The plasma of the PDP module refers to a state in which positive charges (ions) and negative charges (electrons) are mixed in about the same amount, maintaining electrical neutrality while pretending to be close to free particles. In short, it is a mixture of ions and electrons. When a strong voltage is applied to the positive and negative electrodes in a vacuum state, the gas inside is activated and then returns to its stable state as time passes, and it emits strong and beautiful light like an aurora. It is called.

Hereinafter, a plasma display panel according to the related art will be described with reference to the accompanying drawings.

1 illustrates a discharge cell structure of a general plasma display panel.

As shown, a discharge cell of a typical PDP includes a sustain electrode pair including a scan electrode Y and a sustain electrode Z formed on the upper substrate 1, and a lower substrate 2 facing and intersecting with the sustain electrode pair. An address electrode X formed on the substrate is provided.

Each of the scan electrode Y and the sustain electrode Z is composed of a transparent electrode and a metal bus electrode formed thereon. The upper dielectric layer 6 and the MgO protective layer 7 are stacked on the upper substrate 1 on which the scan electrode Y and the sustain electrode Z are formed.

The lower dielectric layer 4 is formed on the lower substrate 2 on which the address electrode X is formed to cover the address electrode X. FIG. The partition 3 is formed on the lower dielectric layer 4. Phosphors 5 are formed on the surfaces of the lower dielectric layers 4 and the partition walls 3.

An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper substrate 1, the lower substrate 2, and the partition wall 3. The upper substrate 1 and the lower substrate 2 are bonded by a real material not shown.

FIG. 2 is a diagram illustrating a driving waveform for driving a conventional plasma display panel. Referring to this, a PDP includes an initialization period for initializing a full screen, an address period for selecting a cell, and a sustain for maintaining discharge of a selected cell. It is driven by periods.

In the initialization period, the rising ramp waveform Ramp-up is simultaneously applied to some scan electrodes Y in the setup period SU. This rising ramp waveform (Ramp-up) causes a discharge in the cells of the full screen. By this setup discharge, positive wall charges are accumulated on the address electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y.

After the rising ramp waveform Ramp-up is supplied in the set-down period SD, the falling ramp waveform Ramp-down falling at the positive voltage lower than the peak voltage of the rising ramp waveform Ramp-up is applied to the scan electrodes ( Is applied to Y). Ramp-down causes a slight erase discharge in the cells, thereby partially erasing the excessively formed wall charge. By this set-down discharge, the wall charges such that the address discharge can be stably generated remain uniformly in the cells.

In the address period, the negative scan pulse scan is sequentially applied to the scan electrodes Y, and the positive data pulse data is applied to the address electrodes X in synchronization with the scan pulse scan. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the initialization period are added, an address discharge is generated in the cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when a sustain voltage is applied.

The positive electrode DC voltage Zdc may be supplied to the sustain electrode Z during the setdown period and the address period. The DC voltage Zdc causes a setdown discharge between the sustain electrode Z and the scan electrode Y in the setdown period, and a large discharge between the scan electrode Y and the sustain electrode Z in the address period. The voltage difference between the sustain electrode Z and the scan electrode Y or between the sustain electrode Z and the address electrode X is set so as not to occur.

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. The cell selected by the address discharge has a sustain discharge, that is, a display discharge between the scan electrode (Y) and the sustain electrode (Z) whenever the sustain voltage (sus) is applied as the wall voltage and the sustain pulse (sus) in the cell are added. This will happen.

3 and 4 are control block diagrams illustrating a driving apparatus of a conventional plasma display panel.

As shown, a conventional plasma display panel driving apparatus includes an RF signal input unit 10, an image signal processing unit 20, a display panel 30, a power supply unit 40, a control unit 50, and an address driver 14. ), A scan driver 15 and a sustain driver 16.

The power supply unit 40 supplies driving power to the address driver 14, the scan driver 15, the sustain driver 16, and other parts.

The video signal converter (VSC) 20 converts input video signals from various input signal sources, wired and wireless, into R, G, and B image information, and scales the aspect ratio of the plasma display panel according to the image information. )do. In addition, the controller 50 transmits screen display information (aspect ratio, picture in picture (PIP), picture on picture (POP), double window, picture signal presence, luminance signal level and / or brightness level, etc.). . To this end, the video signal processor 20 includes a decoder 21 for converting an input video signal and a scaler 22 for scaling an aspect ratio.

The address driver 14 supplies address data to the address electrodes of the plasma display panel 30. The address driver 14 includes a plurality of address driver integrated circuits (ICs) 14a connected to the address electrodes.

The scan driver 15 supplies scan data to the scan electrodes of the plasma display panel 30. The scan driver 15 also includes a plurality of scan driver ICs 15a. The sustain driver 16 supplies sustain data to the sustain electrodes of the plasma display panel 30.

The controller 50 selectively turns on / off or maintains data output from the address driver 14 or the scan driver 15 according to the screen display information, and the power supplied from the power supply 40 The discharge of the screen area cells of the plasma display panel 30 is controlled by selectively supplying the plurality of driving ICs 14a and 15a of the address driver 14 and the scan driver 15.

The controller 50 selectively turns off the data output from the address driver 14 or the scan driver 15 according to the aspect ratio information transmitted from the image signal processor 20, or the address driver IC 14a and the scan driver IC. The power supplied to 15a is selectively controlled (on / off).

Such a driving apparatus of the conventional plasma display panel drives the PDP module by discriminating noise input when the weak field signal is normal data without a difference between the weak field signal and the normal signal that is not. Particularly, in case of analog TV built-in model of PDP, when RF (Radio Frequence) weak electric field (ex: 40dBuV) signal is input, the panel temperature is increased due to the module driving characteristics and the temperature of parts is increased. I will go.
An electric field is a dictionary, meaning a space exerted by an electric force formed around a great body. It is also commonly called an electric field. Therefore, the weak electric field signal is an electric force of an airborne broadcast signal formed around the TV, and is classified into a strong electric field weak electric field according to the strength of the weak electric field, and generally, a weak electric field less than or equal to 30 to 40 dbuV It is divided into strong electric field. In the present invention, 40 dBuV or less will be divided into weak electric fields.
Therefore, in the case of an RF weak field signal, the PDP module receives even noise as data and outputs it to the screen so that each cell of the PDP repeats on / off, thereby increasing unnecessary on / off switching operation of the driving IC. This raises the IC temperature.

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Therefore, in the conventional plasma display panel driving apparatus, the power consumption increases due to the continuous generation of discharge even with respect to the noise of the weak electric field. As the discharge continues, the parts and the PDP are deteriorated due to deterioration of the driving IC and the cell. There was a problem that the life can be shortened.

Accordingly, the present invention has been made to solve the above-described problems of the prior art, and detects and stores a synchronization and noise signal from an input signal at an analog digital converter (ADC) level, and recognizes and outputs a weak electric field above a specific level. SUMMARY OF THE INVENTION An object of the present invention is to provide a driving apparatus and method for driving a plasma display panel to reduce sustain data to perform a low power mode.

In order to achieve the above object, a driving apparatus of a plasma display panel according to the present invention includes: a signal detector for detecting a synchronization signal and a noise signal from an input signal; An image signal processor converting the detected sync signal and noise signal to an ADC level; A controller configured to store the converted ADC level in a storage unit, and determine a current input field as a weak electric field when the ADC level is greater than or equal to a predetermined level, and reduce the output signal to output a driving signal in a low power mode; And a display panel for displaying a screen according to the driving signal.

The controller determines the current input field as a strong electric field when the ADC level is less than or equal to a predetermined level, and outputs a normal driving signal. The controller may reduce the number of sustain data output to the display panel when the low power mode is driven.

The controller may determine the current input field as a weak electric field when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal.

In addition, the driving method of the plasma display panel according to the present invention comprises the steps of: detecting a synchronization signal and a noise signal from the input signal; Converting and storing the detected synchronization signal and noise signal into an ADC level, and determining a current input field as a weak electric field when the ADC level is equal to or greater than a predetermined specific level; Outputting a driving signal in a low power mode by reducing an output signal when the current input field is a weak electric field in the above step; And displaying a screen according to the driving signal.

Determining the current input field as a strong electric field and outputting a normal driving signal when the ADC level is equal to or less than a predetermined predetermined level, and reducing the number of sustain data output to the display panel when driving the low power mode. desirable.

Further, when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal, it is more preferable to determine the current input field as a weak electric field.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

5 is a control block diagram illustrating a driving apparatus of a plasma display panel according to the present invention.

As shown, the driving apparatus of the plasma display panel according to the present invention includes an RF signal input unit 100, an image signal processor 200 including a decoder 210 and a scaler 220, a display panel 300, and a signal detector ( 400, the control unit 500 and the storage unit 600.

The RF signal input unit 100 inputs an RF signal. The signal detector 400 detects a sync signal and a noise signal from the input signal.

The video signal converter (VSC) 200 converts input image signals from various input signal sources in wired and wireless to R, G, and B image information, and scales the aspect ratio of the plasma display panel according to the image information. )do. To this end, the video signal processor 200 includes a decoder 210 for converting an input video signal and a scaler 220 for scaling an aspect ratio. In addition, the image signal processing unit 200 converts the detected synchronization signal and noise signal to an analog-to-digital converter (ADC) level.

The control unit 500 stores the converted ADC level in the storage unit 600. When the ADC level is equal to or more than a predetermined level, the controller 500 determines the current input field as a weak electric field and reduces the output signal to drive the low power mode. Outputs

The controller 500 determines the current input field as a strong electric field when the ADC level is less than or equal to a predetermined level, and outputs a normal driving signal. The sustain data output to the display panel 300 when the low power mode is driven. Reduce the number

In this case, when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal, the controller 500 determines the current input field as a weak electric field.

The display panel 300 displays a screen according to the driving signal of the controller 500.

6 is a control flowchart illustrating a method of driving a plasma display panel according to the present invention.

As shown, the present invention comprises the steps of detecting a synchronization signal and a noise signal from the input signal (S101 ~ S102); Converting and storing the detected sync signal and noise signal into an ADC level (S103), and determining the current input field as a weak electric field when the ADC level is equal to or more than a predetermined level (S104 to S105); Outputting a driving signal in a low power mode by reducing the output signal when the current input field is a weak electric field in the step (S106); Determining the current input field as a strong electric field when the ADC level is equal to or less than a predetermined level, and outputting a normal driving signal (S107); And displaying the screen according to the driving signal (S108).

When the low power mode is driven, the number of sustain data output to the display panel is reduced, and when the input sync signal is lower than the preset reference sync signal and the input noise signal is higher than the preset reference noise signal, the current input field is changed. Judging by the weak electric field.

Referring to the operation of the present invention configured in this way in more detail as follows.

First, an RF signal is input from the RF signal input unit 100 via an aerial antenna ANT (S101).

The signal detector 400 detects a sync signal and a noise signal from the signal input from the RF signal input unit 100 (S102).

Thereafter, the image signal processor 200 converts the detected synchronization signal and noise signal to an analog-to-digital converter (ADC) level (S103).

In this case, the conversion to the ADC level, the change in the input signal or voltage for a predetermined time is detected and sampled and then the average value is determined and converted.

The controller 500 stores the converted ADC level in the storage 600. In general, the storage unit 600 preferably uses a storage medium such as a HDD, and may be configured in the form of a memory device such as a RAM, a ROM, an EPOM, and other memory cards.

In addition, the storage unit 600 also stores a reference synchronization signal and a reference noise signal to be described later.

In addition, when the ADC level is equal to or greater than a predetermined level, the controller 500 determines the current input field as a weak electric field, reduces the output signal, and outputs a driving signal in a low power mode.

That is, when the input synchronization signal is lower than the preset reference synchronization signal (S104) and the input noise signal is higher than the preset reference noise signal (S105), the controller 500 determines the current input field as a weak electric field.

Accordingly, the controller 500 reduces and outputs the number of sustain data output to the display panel 300 when driving the low power mode, and the display panel 300 displays a screen according to the driving signal of the controller 500. .

That is, when an RF weak field (ex: 40dBuV) signal is input, the present invention detects a small noise signal generated when it is determined as a weak field in order to prevent the panel temperature according to the module driving characteristics from rising. It does not recognize it as data.

Therefore, when recognizing data corresponding to noise, the number of sustain data is reduced based on this data, that is, the luminance is reduced to reduce heat generation, and the low power mode function is operated to improve the overall heat generation characteristics.

Meanwhile, when the ADC level is less than or equal to a predetermined level, the controller 500 determines a current input field as a strong electric field and outputs a normal driving signal, and the display panel 300 according to the driving signal of the controller 500. The screen is displayed (S107 to S108).

That is, the control unit 500 may have the input synchronization signal higher than the preset reference synchronization signal (S104), or the input synchronization signal may be lower than the preset reference synchronization signal, and the input noise signal may be lower than the preset reference noise signal. When it is low (S105), the current input field is determined to be a strong electric field.

Therefore, if a strong electric field performs the normal mode and if the ADC level is recognized as a weak electric field above a certain level, the output sustain data is reduced to perform the power saving mode, thereby reducing the number of discharges and thus reducing the power consumption. And prevent deterioration of the cell, thereby prolonging component and PDP life.

In addition, by accurately determining the data through the synchronization signal and the noise signal detection, the conventional method that even the noise of the PDP module receives the RF weak field signal for the RF weak field signal. Characteristics can be enhanced and reliability can be secured.

The present invention described above can be applied not only to flat panel display devices such as PDPs and LCDs, but also to projection TVs, general TVs, monitors, and other video devices, and can be equally applied to analog TVs, digital TVs, and satellite TVs. . In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

According to the driving apparatus and method of the plasma display panel according to the present invention described above, by detecting the synchronization and noise signals from the input signal, and recognizes the weak electric field above a certain level to reduce the output sustain data to perform a power saving mode, The number of discharges is reduced to reduce power consumption, thereby preventing the deterioration of the driving IC and the cell, thereby increasing the life of components and the PDP.

In addition, by accurately determining the data through the synchronization signal and the noise signal detection, the conventional method that even the noise of the PDP module receives the RF weak field signal for the RF weak field signal. It is also possible to enhance the characteristics and to secure reliability.

Claims (8)

A signal detector for detecting a synchronization signal and a noise signal from an input signal; An image signal processor converting the detected synchronization signal and noise signal to an analog digital convertor (ADC) level; A controller configured to store the converted ADC level in a storage unit, and determine a current input field as a weak electric field when the ADC level is greater than or equal to a predetermined level, and reduce the output signal to output a driving signal in a low power mode; And a display panel for displaying a screen according to the driving signal. The method of claim 1, The control unit And determining the current input field as a strong electric field and outputting a normal driving signal when the ADC level is equal to or less than a predetermined predetermined level. The method of claim 1, The control unit And driving the low power mode to reduce the number of sustain data output to the display panel. The method of claim 1, The control unit And determining the current input field as a weak electric field when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal. Detecting a synchronization signal and a noise signal from an input signal; Converting and storing the detected synchronization signal and noise signal into an ADC level, and determining a current input field as a weak electric field when the ADC level is equal to or greater than a predetermined specific level; Outputting a driving signal in a low power mode by reducing an output signal when the current input field is a weak electric field in the above step; And displaying a screen according to the driving signal. The method of claim 5, And determining the current input field as a strong electric field and outputting a normal driving signal when the ADC level is equal to or less than a predetermined predetermined level. The method of claim 5, And driving the low power mode to reduce the number of sustain data output to the display panel. The method of claim 5, And determining the current input field as a weak electric field when the input synchronization signal is lower than the preset reference synchronization signal and the input noise signal is higher than the preset reference noise signal.

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