KR100766282B1 - Plasma display panel device - Google Patents

Abstract

The present invention relates to a plasma display device, comprising a driver for applying different scan voltages to a first scan electrode and a second scan electrode during an address period. By varying the applied Vy voltage to prevent high-temperature mis-discharge, it is possible to drive a stable plasma display panel.

Plasma Display Panel, High Temperature Discharge, Scan Voltage

Description

Plasma display panel device

1 is a view showing a driving waveform applied to the plasma display panel according to the prior art,

2 is a block diagram showing the configuration of a plasma display device according to the present invention;

3 is a block diagram showing the configuration of a scan driver of the plasma display device according to the present invention;

4 is a circuit diagram showing the configuration of a scan driver of the plasma display device according to the present invention;

5 illustrates a driving waveform applied to the plasma display panel according to the present invention.

<Explanation of symbols on main parts of the drawings>

X: address electrode Y: scan electrode

100: plasma display panel 110: data driver

 120: scan driver 121: scan drive control unit

130: sustain drive unit 140: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and more particularly, to a plasma display apparatus capable of preventing high temperature mis-discharge by varying a Vy voltage applied to a scan electrode according to a temperature.

1 is a waveform diagram showing a driving waveform of a plasma display panel according to the prior art.

A plasma display panel is a display device in which vacuum ultraviolet rays (VUV) generated by discharging gas inside a panel collide with phosphors inside the panel to generate light. The plasma display panel includes a scan electrode, a sustain electrode, and a lower part of the plasma display panel. The screen is displayed by generating a discharge by appropriately applying to the address electrodes provided on the substrate.

That is, a cell to generate a discharge is selected by applying a voltage having opposite polarities to the scan electrode and the address electrode, and discharges by alternately applying the same size voltage to the scan electrode, the sustain electrode and the address electrode. Generates.

As shown in FIG. 1, the driving waveform of the plasma display panel according to the related art is composed of a reset period R, an address period A, and a sustain period S. During the reset period, a setup reset signal R_up and The set-down reset signal R_dn is continuously supplied. When the setup reset signal is supplied, a reset discharge is generated between the scan electrode Y and the sustain electrode Z, and wall charges are accumulated in the dielectric layers on the scan electrode and the sustain electrode. When the set down reset signal is supplied, the wall charge inside the discharge cell is erased to secure an operating margin of the driving circuit.

During the reset period R, a high voltage of 300 V or more is applied to the scan electrode Y to initialize the discharge cells so that the discharge cells are initialized so that uniform wall charges are formed in the discharge cells.

During the address period A, a data pulse having a positive polarity is applied to the address electrode X according to the image data, and a scan of negative polarity opposite to the data pulse is applied to the scan electrode Y. The pulse is supplied, and in the case of the cell to which the data pulse is applied, an address discharge occurs due to the voltage difference between the data pulse and the scan pulse.

During the sustain period S, a sustain pulse is alternately supplied to the scan electrode Y and the sustain electrode Z. When a sustain pulse is supplied to the cell where the address discharge is generated, the sustain discharge is generated and the screen is displayed.

When an address discharge is generated between the address electrode X and the scan electrode Y during the address period A, positive (+) wall charges are formed on the scan electrode Y, and the sustain electrode Z ), Negative wall charges are formed.

When the sustain period S starts, a positive polarity sustain pulse is first applied to the scan electrode Y. In this case, as the amount of wall charges formed on the scan electrode Y and the sustain electrode Z increases, Since the wall voltage difference between the scan electrode and the sustain electrode is large, sustain discharge can be efficiently generated.

In this case, in the case of the scan electrode Y positioned at the lower end of the plasma display panel, a scan pulse is applied to the second half of the address period A, and when a data pulse is applied when the scan pulse is applied, an address discharge is caused.

Since the scan electrode (Y) and the address electrode (X) are orthogonal to each other, the data pulses applied to the opposite discharge with the scan electrode (Y) located at the upper end of the plasma display panel are not only the scan electrode (Y) located at the upper end. In addition, it affects the scan electrode (Y) located at the lower end.

That is, in the case of the scan electrode Y positioned at the lower end of the plasma display, a negative polarity Vy voltage is applied to the scan electrode Y until an address discharge occurs, but the address electrode X is formed to be orthogonal. As a data pulse is applied, an influence is generated on the wall charges formed on the scan electrodes.

Even when a scan pulse is not applied to the scan electrode Y, when a positive data pulse is applied to the address electrode X, the voltage difference between the scan electrode Y and the scan electrode Y is changed. Will occur.

Accordingly, the negative polarity of the wall charges formed on the scan electrode Y disappears, so that an address discharge may not occur even when a scan pulse is applied to the scan electrode.

In addition, when the wall charges formed on the scan electrode Y are disturbed, even when a data pulse is not applied, a weak discharge occurs even when a data pulse is applied to the address electrode X formed to cross the scan electrode Y. Done.

In this case, address discharge does not occur even when a scan pulse is applied to the scan electrode (Y). If no address discharge is generated, an erroneous discharge is generated in which the sustain discharge is not generated even when a sustain pulse is applied during the sustain period S. That is, an on cell to be turned on becomes an off cell.

However, the wall charges formed on the scan electrode Y are affected by the data pulse applied to the address electrode X, which is worsened as the temperature of the plasma display panel increases, and is located at the lower end of the plasma display panel. There is a problem that an erroneous discharge phenomenon occurs in the scan electrode.

The present invention has been made to solve the above problems of the prior art, by varying the Vy voltage applied to the scan electrode according to the temperature to prevent the wall charge formed as the temperature of the plasma display panel rises It is an object of the present invention to provide a plasma display device capable of eliminating high-temperature erroneous discharge.

According to an aspect of the present invention, there is provided a plasma display apparatus including: an upper substrate including a plurality of scan electrodes and a sustain electrode; and a lower substrate formed to face the upper substrate. And a scan driving unit connected to the scan electrode of the panel and including an operational amplifier for outputting a driving signal, and a scan driving control unit applying a low Vy voltage to the scan electrode when the panel is hot. It is done.

Here, the operational amplifier is characterized in that the reference voltage is applied to the (+) input terminal, and a predetermined voltage value changed in response to the change of temperature is applied to the (-) input terminal.

The scan driving controller is connected in parallel between the negative input terminal of the operational amplifier and the scan voltage source input to the scan driver, and comprises a first to third resistors and a switch.

The switch may be connected in parallel between the second and third resistors, and the first to third resistors may be connected in parallel.

The switch is characterized in that the panel is turned off at room temperature, and turned on at high temperatures.

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

2 is a block diagram showing a configuration of a plasma display device according to the present invention, Figure 3 is a block diagram showing a configuration of a scan driver of the plasma display device according to the present invention, Figure 4 is a plasma display according to the present invention 5 is a circuit diagram showing the configuration of the scan driver of the apparatus, and FIG. 5 is a diagram showing a driving waveform applied to the plasma display panel according to the present invention.

As shown in FIG. 2, the plasma display apparatus according to the present invention includes a panel 100 and a data driver 110 for applying data to address electrodes X1 to Xm to drive the panel 100 and a scan. A scan driver 120 for driving the electrodes Y1 to Yn, a sustain driver 120 for driving the sustain electrode Z, and a controller 140 for controlling the drivers 110 to 130. It is composed.

The panel 100 includes a plurality of address electrodes X arranged in a column direction, a plurality of scan electrodes Y and a sustain electrode Z arranged in a row direction.

The scan electrode is formed corresponding to each sustain electrode, and one end of the sustain electrode is connected to each other, and the same voltage is applied thereto.

In addition, the panel 100 is formed by bonding a front panel on which the scan electrode Y and the sustain electrode Z are horizontally alternately and a rear panel on which the address electrode X is formed, wherein the scan electrode and the sustain electrode are joined. And the address electrode are disposed to face each other with the discharge space interposed therebetween, and the discharge space at the intersection of the scan electrode and the sustain electrode and the address electrode forms a basic one discharge cell.

The data driver 110 samples and latches data in response to a timing control signal from the controller 140, and then supplies the data to the address electrodes X1 to Xm (hereinafter, X).

The scan driver 120 supplies a scan pulse and a sustain pulse to the scan electrodes Y1 to Yn (hereinafter referred to as Y) under the control of the controller 140, and the sustain driver 130 controls the controller 140. And alternately operate with the scan driver 120 to supply a sustain pulse to the sustain electrode Z.

The control unit 140 receives a vertical / horizontal synchronization signal and a clock signal to generate timing control signals CTRX, CTRY, and CTRZ required for each of the driving units 110 to 130, and the driving unit corresponding to the timing control signal ( 110 to 130 to control the driving unit.

The plasma display panel 100 drives one frame by dividing one frame into one or more subfields having different numbers of discharges in order to express gray scale, and the subfields are largely reset period (R) and address period (A). , Sustain period (S).

In the reset period R, a high voltage is equally applied to all discharge cells regardless of whether the discharge cells are on or off in the previous subfield.

In order to make all the discharge cells in the same state, the scan driver 120 applies a high voltage of 250 V or more to the scan electrode Y to initialize the discharge cells, and mainly uses a ramp waveform to improve contrast. do.

In this case, a voltage of a ground (GND) level is normally applied to the sustain electrode Z and the address electrode X, but is biased to the sustain electrode Z in order to enhance the discharge generated during the reset period R. A voltage may also be applied.

In the address period A, image writing is performed to each discharge cell. A data pulse of positive polarity is applied to the address electrode X according to the image data, and the scan electrode Y is provided to the address electrode. A scan pulse having a polarity opposite to the applied voltage is applied. An address discharge is generated by adding a voltage difference between the address electrode and the voltage applied to the scan electrode and the voltage of the wall charge formed during the reset period R.

In the sustain period S, a pulse Vs signal having opposite polarity is alternately applied to the scan electrode Y and the sustain electrode Z to generate a sustain discharge and display the screen.

In order to express 256 levels of gray level, the plasma display panel 100 divides one frame (16.7 ms) into a plurality of subfields, and the reset period R and the address period A of each subfield are the same. The sustain period S has a different number of sustain pulses for each subfield, and thus the number of sustain discharges generated in the subfield is different.

As illustrated in FIG. 3, the scan driver 120 of the plasma display apparatus varies the output voltage according to a temperature change of the scan electrode Y that receives the signal output from the scan driver 120. Scan drive control unit 121 is configured to be connected.

In addition, the scan driver 120 of the present invention includes a temperature detector (not shown) for sensing the temperature of the plasma display panel 100.

Since the address mis-discharge becomes more severe as the temperature of the panel 100 increases, the scan driver 120 includes a temperature sensing unit to vary the Vy voltage applied according to the temperature of the panel 100.

The scan driving controller 121 connects a switch to a resistance element in parallel to turn on the switch when the panel is at a high temperature, that is, the output voltage of the scan driver 120 applied to the scan electrode, that is, the Vy voltage. To increase the, will be described in detail through the circuit diagram below.

As shown in FIG. 4, the circuit of the scan driver of the plasma display apparatus according to the present invention is connected to the scan electrode (Y) of the plasma display panel and the scan electrode (Y) to drive the signal of the panel 100. And a scan driver 120 including an operational amplifier A for applying a Vy voltage to the scan electrode Y, and a negative input terminal of the operational amplifier A, and a plurality of resistors R1, R2, R3) and a scan driving controller 121 for varying the Vy voltage according to the temperature change of the panel 100 using the switch SW.

The scan driver 120 includes fifth to seventh resistors R5, R6, and R7 and an operational amplifier A connected to the basic voltage Vy.

Here, the sixth resistor (R6) and the seventh resistor (R7) applies a reference voltage to the (+) input terminal of the operational amplifier (A), the fifth resistor (R5) is the operational amplifier (A) It is connected to the output terminal of the to prevent the feedback phenomenon of the operational amplifier (A).

In addition, the scan driving controller 121 is input to the negative terminal of the operational amplifier A, and a suspend voltage of the scan electrode Y is driven by the first resistor R1 and the third resistor R3. The voltage divider is formed and the reference voltage input to the positive input terminal of the operational amplifier A serves as a comparator.

Here, when the reference voltage of the (+) input terminal of the operational amplifier (A) is greater than the voltage of the (-) input terminal, the scan driver 120 applies a drive output voltage to the scan electrode (Y) When the reference voltage of the (+) input terminal is lower than the voltage of the (−) input terminal, a stop output voltage is applied.

On the other hand, the switch formed between the first resistor (R1) and the second resistor (R2) of the scan driving control unit 121 is to be turned off / on operation when the control unit 121 at room temperature and high temperature, respectively The switch SW is turned on when the temperature is high, thereby increasing the suspend voltage Ysus_dn, thereby applying a voltage greater than room temperature to the scan electrode Y. This reduces the gap of the down voltage (Ysus_dn).

That is, in an embodiment, when the basic voltage Vy is 15 V, the sixth resistor R6 is 15 kV, and the seventh resistor R7 is 5.6 kV, it is input to the operational amplifier A. The reference voltage Vref becomes 4V by the following equation.

Vref = (5.6㏀ / 20.6㏀) x 15V = 4V

When the fifth resistor R5 is 5.6 kV, the first resistor R1 is 47 kV, the second resistor R2 is 10 kV, and the third resistor R3 is 224 kV, The voltage of the susdown voltage (Ysus_dn) at and at high temperature is as follows.

First, at room temperature

Vref = 4V = 57㏀ / (224㏀ + 57㏀) x Ysus_dn

Ysus_dn = 4V x (224㏀ + 57㏀) / 57㏀ = 20V

On the other hand, at high temperatures,

Vref = 4V = 47㏀ / (224㏀ + 47㏀) x Ysus_dn

Ysus_dn = 4V x (224㏀ + 47㏀) / 47㏀ = 24V

Becomes

As shown in the above formula, when the temperature is higher than the normal temperature, the suspend voltage (Ysus_dn) is increased to increase the Vy voltage applied to the scan electrode (Y) of the plasma display panel 100, thereby preventing mis-discharge of the panel. To prevent it.

As shown in FIG. 5, when the Vy voltage applied to the scan electrodes Y1 to Yn of the panel increases, a scan pulse is applied to the driving waveform of the scan driver of the plasma display panel according to the present invention. Even if the time until the discharge is generated and the wall charges formed in the discharge cells are erased, the magnitude of the Vy voltage is increased, thereby reducing the wall voltage due to wall charge attenuation.

In the case of the scan electrodes Y1 to Yn located in the panel, a higher Vy voltage is applied at high temperatures than at room temperature, thereby preventing wall charge attenuation formed in the discharge cells, thereby preventing sustained discharge due to address mis-writing. It is possible to prevent the occurrence of the erroneous discharge is not generated.

Therefore, the plasma display apparatus configured as described above includes a temperature sensing unit (not shown) for sensing the temperature of the panel to vary the scan voltage Vsc applied according to the temperature of the panel.

That is, as the temperature of the plasma display panel increases, the scan voltage is varied so that the magnitude of the applied Vy voltage increases. The Vy voltage increases as the temperature increases, but the scan voltage becomes too high to prevent damage to the scan IC. It should be approximately 150V or less.

As the temperature of the panel increases, the amount of wall charges attenuated inside the discharge cell increases until the scan pulse is applied during the address period, thereby decreasing the amount of wall charges attenuated by increasing the magnitude of the applied Vy voltage.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within a range in which technical thoughts are protected.

Plasma display device according to the present invention configured as described above has the effect that the stable plasma display panel can be driven by varying the magnitude of the Vy voltage applied according to the temperature of the plasma display panel to prevent high-temperature mis-discharge.

Claims (7)

An upper substrate including a plurality of scan electrodes and a sustain electrode; In the plasma display panel device including a lower substrate formed to face the upper substrate, A scan driver connected to the scan electrodes of the panel and including an operational amplifier for outputting a driving signal; If the panel is a high temperature includes a scan driving control unit for applying a scan voltage lower than the room temperature voltage to the scan electrode, The operational amplifier is a plasma display device, characterized in that the reference voltage is applied to the (+) input terminal, a predetermined voltage value changed in response to the change in temperature is applied to the (-) input terminal. delete delete The method according to claim 1, And the scan driving control unit comprises first to third resistors and a switch. The method according to claim 4, And the switch is connected in parallel with the second resistor. delete The method according to claim 5, The switch is a plasma display device, characterized in that the panel is turned off at room temperature, the operation is turned on at high temperatures.

Images