KR20060082754A - Device for driving plasma display panel - Google Patents

Abstract

The apparatus for driving a plasma display panel of the present invention includes a front panel on which scan electrodes and a sustain electrode are formed, a rear panel on which address electrodes arranged to intersect the scan electrode and the sustain electrode are formed, and a partition wall partitioning discharge cells on the rear panel. A driving apparatus of a plasma display panel, comprising: a sustain pulse supply unit for supplying sustain pulses to electrodes, and a temperature compensation unit connected to the sustain pulse supply unit and having a resistance value changed according to the temperature of the panel. At this time, the temperature compensation unit is characterized in that the resistance is increased when the temperature of the panel increases, and the resistance is reduced when the temperature of the panel decreases. The present invention includes a temperature compensator for changing the size of the resistance according to the temperature of the panel, thereby controlling the temperature rise of the panel to prevent mis-discharge due to the temperature rise.

Description

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

1 is a structural diagram of a general plasma display panel.

2 is a circuit diagram of a conventional scan electrode driver.

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

The present invention relates to a plasma display panel, and more particularly, to a driving apparatus of a plasma display panel.

In general, a plasma display panel displays an image including a character or a graphic by emitting phosphors by ultraviolet rays of 147 nm generated when the He + Xe or Ne + Xe inert mixed gas is discharged.

1 is a perspective view illustrating a structure of a general plasma display panel. As shown in FIG. 1, the plasma display panel includes scan electrodes 12A and sustain electrodes 12B formed on the upper substrate 10, and data electrodes 20 formed on the lower substrate 18. do.                         

Each of the scan electrode 12A and the sustain electrode 12B includes a transparent electrode and a bus electrode. The transparent electrode is formed of indium tin oxide (ITO). The bus electrode is formed of a metal for reducing resistance.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 on which the scan electrodes 12A and the sustain electrodes 12B are formed.

In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. The protective film 16 is usually formed of magnesium oxide (MgO).

Meanwhile, the lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the data electrode 20 is formed. The phosphor layer 26 is applied to the surfaces of the lower dielectric layer 22 and the partition wall 24.

The data electrode 20 is formed in the direction crossing the scan electrode 12A and the sustain electrode 12B. The partition wall 24 is formed in parallel with the data electrode 20 to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 18 and the partition wall 24.

2 is a circuit diagram of a conventional scan electrode driver. The scan electrode driver of a conventional plasma display panel having such a structure generates a rising ramp pulse Ramp-up and a falling ramp pulse Ramp-down in a reset period.

First, during the reset period, the setup switch Q5 and the seventh switch Q7 are turned on, and the sustain voltage Vs from the sustain pulse supply 40 is connected to the negative terminal of the second capacitor C2. ) Is applied to supply the sum of the sustain voltage and the set-up voltage (Vs + Vst) to the fifth switch Q5.

The fifth switch Q5 has a predetermined slope of the voltage supplied from the second capacitor C2 by the first variable resistor VR1 and the third capacitor C3, and the seventh switch Q7. And to the scan electrode via the drive integrated circuit 48. Therefore, a rising ramp pulse Ramp-up is applied to the scan electrodes.

Thereafter, when the fifth switch Q5 is turned off, the voltage of the scan electrode is drastically lowered to Vs by the voltage of Vs supplied from the sustain pulse supply 40, and the seventh switch Q7 is turned off. 10 switch Q10 is turned on.

The tenth switch Q10 lowers the voltage of the second node n2 with a predetermined slope to the write scan voltage (-Vw) while the channel width is adjusted by the second variable resistor VR2 provided at the front end thereof. . In this case, a falling ramp pulse Ramp-down is applied to the scan electrode.

Next, a scan pulse is applied to a scan electrode in which the eleventh switch Q11 is turned on and scanned in the scan period, and a scan bias voltage Vsc is applied by turning on the eighth switch Q8 to a scan electrode that is waiting for scan or has already been scanned. ) Is applied.

In the sustain period, the voltage of the scan electrode is increased to the sustain voltage Vs by the resonance of the inductor L1 and the panel C by the turn-on of the first switch Q1 of the sustain pulse supply unit 40, and then the third switch. The sustain voltage Vs is maintained by the turn-on of Q3. After the energy is recovered by resonance of the inductor L1 and the panel C as the second switch Q2 is turned on, the voltage of the scan electrode drops to the ground level and the ground level is turned by the fourth switch Q4. Is maintained.

Since the plasma display panel is driven by applying a large voltage to the cell, a large amount of heat is generated not only in the plasma display panel but also in the driving device of the plasma display panel. That is, the voltage level of the setup pulse is 400V and the voltage level of the sustain pulse is 200V. Since such a high voltage is applied to each electrode, a lot of heat is generated in the plasma display panel and the driving device.

The heat generated in this way affects the charge distribution inside the cell. In other words, as the internal and external temperatures of the discharge cells rise, the insulation characteristics of the dielectric material become weak and wall charge leakage on the scan electrodes and the common sustain electrodes occurs. In addition, at high temperature, since the movement of the space charge in the cell becomes active, recombination easily occurs, resulting in loss of wall charges, thereby causing mis-discharge.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a driving apparatus of a plasma display panel that compensates for a temperature change caused by heat generation.

In order to achieve the above object, a driving apparatus of a plasma display panel according to the present invention includes a front panel having a scan electrode and a sustain electrode formed thereon, a rear panel having an address electrode arranged to intersect the scan electrode and the sustain electrode formed thereon, and a discharge cell formed at the rear panel. A driving apparatus for a plasma display panel including partitions, the apparatus comprising: a sustain pulse supply unit for supplying sustain pulses to electrodes, and a temperature compensating unit connected to the sustain pulse supply unit and having a resistance value changed depending on the temperature of the panel; Characterized in that.

Here, the temperature compensation unit is connected to the gate terminal of the switch for raising the voltage level of the sustain pulse from the ground level to the sustain voltage.

In addition, the temperature compensator is characterized in that the resistance value increases when the temperature of the panel increases, and the resistance value decreases when the temperature of the panel decreases.

In addition, the slope of the sustain pulse is changed according to the resistance value of the temperature compensator.

In addition, when the resistance value of the temperature compensator increases, the slope of the sustain pulse decreases, and when the resistance value of the temperature compensator decreases, the slope of the sustain purse increases.

In addition, the temperature compensation unit is characterized in that the thermal resistor.

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

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

As shown in FIG. 3, a front panel (not shown) having scan electrodes and sustain electrodes formed thereon, a rear panel (not shown) having address electrodes arranged to intersect the scan electrodes and sustain electrodes formed thereon, and a discharge cell on the rear panel A first embodiment of a driving apparatus of a plasma display panel including a partition wall partitioning unit may include a Y sustain pulse supply unit 300, a setup supply unit 320, a setdown supply unit 340, a scan voltage supply unit 360, and a drive integrated circuit. 380 and a scan reference voltage supply unit 400.

<Y sustain pulse supply part>

The Y sustain pulse supply unit 300 applies a sustain pulse to the scan electrode (Y). When the first switch Q1 of the Y sustain pulse supply unit 300 is turned on, the voltage of the scan electrode Y increases to the sustain voltage Vs due to the resonance of the inductor L1 and the panel C. When the third switch Q3 is turned on, the voltage of the scan electrode Y is maintained at the sustain voltage Vs. When the second switch Q2 is turned on, the voltage of the scan electrode Y drops to the ground level. When the fourth switch Q4 is turned on, the voltage of the scan electrode Y is maintained at the ground level.

The strong sustain discharge is generated by the sustain pulses formed as described above during the period in which the first switch Q1 and the third switch Q3 are turned on. Therefore, most of the heat generated in the plasma display panel is formed during the period in which the first switch Q1 and the third switch Q3 are turned on.

In particular, when the voltage of the scan electrode Y rises from the ground level to the sustain voltage Vs when the first switch Q1 is turned on, that is, the shorter the ER time, the stronger the discharge occurs. Will rise further.

Therefore, the driving device of the present invention includes a temperature compensator 310 connected to the Y sustain pulse supply unit 300 and whose resistance value varies depending on the temperature of the panel.

The temperature compensator 310 is connected to a switch for raising the voltage level of the sustain pulse from the ground level to the sustain voltage, that is, the gate terminal of the first switch Q1.

The first temperature compensator 310 has a characteristic that the resistance value increases when the temperature of the panel increases, and the resistance value decreases when the temperature of the panel decreases. As the resistance of the first temperature compensator 310 is changed as described above, that is, the slope of the sustain pulse is changed according to the resistance value of the first temperature compensator 310.

In more detail, when the resistance of the first temperature compensator 310 is increased, the slope of the sustain pulse decreases, and when the resistance of the temperature compensator decreases, the slope of the sustain purse increases.

Accordingly, when the panel temperature rises, the resistance increases, and when the first switch Q1 turns on, the time when the voltage of the scan electrode Y rises from the ground level to the sustain voltage Vs, i.e., the ER time becomes longer. Relatively weak discharge. Therefore, the temperature of the panel is lowered and the misdischarge caused by the temperature rise of the panel can be solved.

In addition, as described above, the first temperature compensator 310 has a characteristic that the resistance value decreases when the temperature of the panel decreases. Accordingly, when the temperature of the panel is lowered, the first temperature compensator 310 decreases the resistance, and thus, when the first switch Q1 is turned on, the ER time decreases, thereby causing a strong sustain discharge.

The first temperature compensator 310 is a thermal resistor whose resistance is changed according to the panel temperature. Of course, such a temperature compensator may be connected to the gate terminal of the second switch Q2.

The Z sustain pulse supply unit 420 configured in the same circuit as the Y sustain pulse supply unit 300 applies the sustain pulse to the sustain electrode Z alternately with the sustain pulse supply unit 300.

〈Setup Supply Unit〉

The setup supply unit 320 includes a second temperature compensator 325 whose resistance varies with temperature, and the sum of the sustain voltage and the setup voltage (Vs + Vst) at the sustain voltage Vs applied by the sustain pulse supply unit 300. The rising ramp pulse rising up to) is applied to the scan electrode (Y).

At this time, the second temperature compensator 325 is a thermal resistor. When the temperature of the panel rises, the resistance increases to increase the slope of the rising ramp pulse. When the temperature of the panel decreases, the resistance decreases to decrease the slope of the rising ramp pulse. Adjust the temperature rise of the panel.

〈Set Down Supply Part〉

The set-down supply unit 340 applies the falling ramp pulse to the scan electrode Y at the sustain voltage after the voltage is lowered to the sustain voltage applied by the sustain pulse supply unit 300.

<Scan voltage supply part>

The scan voltage supply unit 360 applies a scan voltage (−Vyw) to the scan electrode Y in the address period.                     

〈Drive integrated circuit〉

The drive integrated circuit 380 applies the corresponding pulses to the scan electrode Y in the initialization period, the address period, and the sustain period.

<Scan reference voltage supply part>

The scan reference voltage supply unit 400 applies the scan reference voltage Vsc to the scan electrode Y through the drive integrated circuit to the scan electrode to which the scan voltage -Vyw is not applied.

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 includes a temperature compensating unit in which the size of the resistance is changed according to the temperature of the panel, thereby controlling the temperature rise of the panel to prevent erroneous discharge due to the temperature rise.

Claims (6)

A front panel having a scan electrode and a sustain electrode formed thereon; a rear panel having an address electrode arranged to intersect the scan electrode and the sustain electrode; and a partition wall partitioning discharge cells on the rear panel. In A sustain pulse supply unit supplying sustain pulses to the electrodes, respectively; And a temperature compensator connected to the sustain pulse supply part and having a resistance value changed according to the temperature of the panel. The method of claim 1, And the temperature compensator is connected to a gate terminal of a switch for raising the voltage level of the sustain pulse from the ground level to the sustain voltage. The method of claim 2, And the temperature compensator increases resistance when the temperature of the panel increases and decreases the resistance when the temperature of the panel decreases. The method of claim 3, wherein And a slope of the sustain pulse is changed according to the resistance of the temperature compensator. The method of claim 4, wherein And when the resistance value of the temperature compensator increases, the slope of the sustain pulse decreases, and when the resistance value of the temperature compensator decreases, the slope of the sustain purse increases. The method according to any one of claims 1 to 5, And the temperature compensating unit is a thermal resistor.

Images