KR20040086642A - Apparatus of driving plasma display panel and method of driving the same - Google Patents

Abstract

PURPOSE: An apparatus for driving a plasma display panel and its driving method are provided to maintain a constant temperature of the plasma display panel. CONSTITUTION: The apparatus for driving a plasma display panel comprises the plasma display panel(30) and a heating unit. A temperature detector unit(52) detects a temperature of the panel, and a control unit(54) drives the heating unit in response to a detection signal of the detector unit. And a radiating plate(40) is attached to a rear side of the panel.

Description

A driving apparatus of a plasma display panel and a driving method thereof {APPARATUS OF DRIVING PLASMA DISPLAY PANEL AND METHOD OF DRIVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a driving apparatus for a plasma display panel and a method for driving the plasma display panel, which are capable of maintaining a constant temperature of the panel.

Plasma Display Panel (hereinafter referred to as "PDP") is an ultraviolet light generated when an inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne, etc. discharges to display an image by emitting phosphors. do. Such PDPs are not only thin and large in size, but also have improved in image quality due to recent technology development.

Referring to FIG. 1, a conventional PDP includes a panel 10 and a heat sink 20 provided on a rear surface of the panel 10.

The panel 10 includes a scan electrode Y and a sustain electrode Z formed on the upper substrate 10a and an address electrode X formed on the lower substrate 10b as shown in FIG. 2. do.

Each of the scan electrode Y and the sustain electrode Z has a line width smaller than the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed at one edge of the transparent electrode. 13Z). The transparent electrodes 12Y and 12Y are usually formed on the upper substrate 10a by indium tin oxide (ITO). The metal bus electrodes 13Y and 13Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10a having the scan electrode Y and the sustain electrode Z side by side. 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. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 10b on which the address electrode X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The partition wall 24 is formed in parallel with the address electrode X to prevent ultraviolet rays and 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. Inert mixed gas is injected into the discharge space provided between the upper and lower substrates 10a and 10b and the partition wall 24.

The heat sink 20 installed on the rear surface of the panel 10 supports the panel 10 and serves to dissipate heat generated when the panel 10 is driven. The heat sink 20 is formed of a metal material having a good thermal conductivity, for example, aluminum (Al) or the like so as to radiate heat well.

Such a PDP is time-divisionally driven by dividing one frame into several subfields having different number of emission times in order to realize gray level of an image. Each subfield is divided into an initialization period for initializing the full screen, an address period for selecting a scan line and selecting a cell in the selected scan line, and a sustain period for implementing gray levels according to the number of discharges.

Here, the initialization period is divided into a plurality of setup periods in which the rising ramp waveform is supplied and a set-down period in which the falling ramp waveform is supplied. For example, when the image is to be displayed with 256 gray levels, as shown in FIG. 3, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8. As described above, each of the eight subfields SF1 to SF8 is divided into an initialization period, an address period, and a sustain period. The initialization period and the address period of each subfield are the same for each subfield, while the sustain period is increased at a rate of 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. .

4 shows driving waveforms of a PDP supplied to two subfields.

In Fig. 4, Y represents a scan electrode and Z represents a sustain electrode. And X represents an address electrode.

Referring to FIG. 4, the PDP is driven by being divided into an initialization period for initializing the full screen, an address period for selecting a cell, and a sustain period for maintaining discharge of the selected cell.

In the initialization period, the rising ramp waveform Ramp-up is applied to all the scan electrodes Y simultaneously. This rising ramp waveform (Ramp-up) causes a slight discharge in the cells of the full screen to generate wall charges in the cells. During the set down period, after the rising ramp waveform Ramp-up is supplied, 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 Y. It is applied at the same time. Ramp-down generates weak erase discharges in the cells, thereby eliminating unnecessary charges during wall charges and space charges generated by setup discharges, and uniformly distributing the wall charges required for address discharges in the cells of the full screen. Will remain.

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. 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. Wall charges are generated in the cells selected by the address discharge.

Meanwhile, the positive polarity DC voltage of the sustain voltage level Vs is supplied to the sustain electrodes Z during the set down period and the address period.

In the sustain period, sustain pulses sus are alternately applied to the scan electrodes Y and the sustain electrodes Z. FIG. Then, the cell selected by the address discharge is sustained in the form of surface discharge between the scan electrode (Y) and the sustain electrode (Z) whenever the sustain pulse (sus) is applied while the wall voltage and the sustain pulse (sus) in the cell are added. Discharge occurs. Finally, after the sustain discharge is completed, an erase ramp waveform (erase) having a small pulse width is supplied to the common sustain electrode (Z) to erase wall charges in the cell.

However, the conventional PDP driven as described above generates bright point misfiring when operated at low temperature. In other words, when the low temperature operating characteristics of the PDP according to the operating temperature, the bright point discharge is generated in the plurality of discharge cells. This bright spot discharge occurs because particle motion is slowed at low temperatures.

In detail, when the movement of particles is slowed at low temperature, erasure discharge due to erasure lamp waveform (erase) may not be normally generated. In the cells in which the erase discharge is not normally generated, the wall charges formed on the scan electrode Y and the sustain electrode Z are not erased.

Thereafter, a positive rising ramp waveform Ramp-up is supplied to the scan electrode Y during the setup period. At this time, since the negative wall charges are formed on the scan electrode Y (that is, the voltage applied to the scan electrode Y and the wall charges formed on the scan electrode Y have opposite polarities), the setup is performed. Normal discharge does not occur in the period. Therefore, no discharge occurs even in the setdown period following the setup period. As such, if normal discharge does not occur in the initialization period, wall charges excessively formed in the erasing period affect the address period and the sustain period. In other words, the wall discharges excessively formed in the discharge cells cause an undesired strong point discharge in the sustain period. In order to prevent such bright point mis-discharge at low temperatures, a method capable of keeping the panel temperature constant is desired.

Accordingly, it is an object of the present invention to provide a driving apparatus for a plasma display panel and a driving method thereof for maintaining a constant temperature of the panel.

1 is a view showing that a conventional plasma display panel is installed on a heat sink.

2 is a perspective view showing a conventional three-electrode AC surface discharge type plasma display panel.

3 is a view showing one frame of a conventional AC surface discharge type plasma display panel.

FIG. 4 is a waveform diagram showing a driving waveform supplied to electrodes during the subfield shown in FIG.

5 is a view showing a driving apparatus for a plasma display panel according to a first embodiment of the present invention;

Figure 6a is a diagram showing a hot wire of the mesh form of the hot wire form shown in FIG.

FIG. 6B is a view showing a stripe-shaped hot wire among the hot wire shapes shown in FIG. 5; FIG.

7 is a view showing a driving apparatus for a plasma display panel according to a second embodiment of the present invention.

FIG. 8 is a flowchart illustrating a method of driving the driving apparatus of the plasma display panel shown in FIGS. 5 and 7.

<Description of Symbols for Main Parts of Drawings>

10,30 Panel 20,40 Heat Sink

10a, 30a: Upper board 10b, 30b: Lower board

Y: scan electrode Z: sustain electrode

X: address electrode 12Y, 12Z: transparent electrode

13Y, 13Z: metal bus electrode 14: upper dielectric layer

16: protective film 22: lower dielectric layer

24: partition 26: phosphor layer

52: temperature detector 54: control unit

56: heating drive 58: heating unit

In order to achieve the above object, the driving apparatus of the plasma display panel of the present invention includes a plasma display panel, a heating unit for heating the panel, a detection unit for detecting the temperature of the panel, and the heating in response to a detection signal from the detection unit. A control unit for driving the unit is provided.

The driving device of the plasma display panel further includes a heat sink attached to a rear surface of the panel.

In the driving apparatus of the plasma display panel, the heating unit includes a heating wire installed in the heat sink and a driving unit heating the heating wire in response to a driving signal from the control unit.

In the driving apparatus of the plasma display panel, the heating wire is installed on the rear surface of the heat sink.

In the driving apparatus of the plasma display panel, the heating wire is installed between the panel and the heat sink.

In the driving apparatus of the plasma display panel, the heating wire is installed on the rear surface of the panel.

In the driving apparatus of the plasma display panel, the hot wire may have a mesh shape.

In the driving apparatus of the plasma display panel, the hot wire may have a stripe shape.

In the driving apparatus of the plasma display panel, the control unit drives the heating unit such that the temperature of the panel is maintained at approximately 15 ° C. or more.

According to an exemplary embodiment of the present invention, a method of driving a plasma display panel includes detecting a temperature of a plasma display panel having a heat sink, comparing the detected panel temperature with a reference temperature, and comparing the panel with a result of the comparison. Heating.

In the method of driving the plasma display panel, the heating of the panel may include heating a heating wire installed on a rear surface of the heat sink.

In the method of driving the plasma display panel, the heating of the panel may include heating a heating wire disposed between the panel and the heat sink.

In the method of driving the plasma display panel, the reference temperature is about 15 ° C.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 8.

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

Referring to FIG. 5, a driving apparatus of a PDP according to a first embodiment of the present invention includes a plasma display panel 30, a heat sink 40 provided on a rear surface of the panel 30, and a temperature of the panel 30. A temperature detector 52 for detecting a temperature, a controller 54 which outputs a control signal according to the temperature of the panel sensed by the temperature detector 52, and a heating driven by the control signal of the controller 54. The driving unit 56 and the heating unit 58 is provided on the rear surface of the heat dissipation plate 40 and heats the panel 30 by driving the heating driving unit 56.

The panel 30 includes an upper substrate 30a on which a plurality of scan electrodes are formed, a lower substrate 30b including a plurality of address electrodes formed in a direction crossing the scan electrodes and a phosphor layer formed on the front surface of the substrate. do. The phosphor generates visible light by the discharge between the scan electrodes and the address electrodes, and adjusts the transmittance of the visible light to display a predetermined image.

The heat dissipation plate 40 installed on the rear surface of the panel 30 supports the panel 30 and serves to dissipate heat generated when the panel 30 is driven. The heat sink 40 is formed of a metal material having good thermal conductivity, for example, aluminum (Al) or the like so that the heat radiation is good.

The temperature detector 52 always serves to detect the temperature of the panel while the PDP is not displayed. The temperature detector 52 supplies the detected panel temperature to the controller 54.

The controller 54 compares and judges the temperature of the panel detected by the temperature detector 52 and supplies a control signal to the heating driver 56 when the temperature of the panel falls below a reference temperature (for example, approximately 15 ° C.). Play a role.

The heating driver 56 drives the heating unit 58 according to the control signal supplied from the control unit 54. That is, if the temperature of the panel supplied from the control part 54 is below the reference temperature, the heating drive part 56 drives the heating part 58, and if it is more than the reference temperature, it will not drive the heating part 58. FIG. At this time, when the PDP is displayed and the panel temperature becomes high, since the heating driver 56 no longer drives the heating unit 58, there is no unnecessary power consumption.

The heating unit 58 is formed of a mesh-shaped hot wire as shown in FIG. 6A or a stripe-shaped hot wire as shown in FIG. 6B, and is installed on the rear surface of the heat sink 40. The heating unit 58 is driven by the heating driving unit 56 serves to apply heat to the panel.

The driving device of the PDP according to the first embodiment of the present invention is a heating unit formed of a heating wire provided on the rear surface of the heat sink 40 when the panel 30 falls below a reference temperature (for example, approximately 15 ° C.) 58 is applied to increase the temperature of the heat sink 40 by heat conduction. In this way, the heat sink 40 and the panel 30 which are compressed are also increased in temperature to maintain the temperature of the panel 30 above the reference temperature. Therefore, it is possible to prevent the bright spot mis-discharge generated because the particle movement is slowed when the PDP is operated at low temperatures.

7 is a diagram illustrating a driving apparatus of a plasma display panel according to a second embodiment of the present invention.

Referring to FIG. 7, in the plasma display panel driving apparatus according to the second embodiment of the present invention, a heating unit 58 is installed between the panel 30 and the heat sink 40 as compared with the first embodiment of the present invention. Except that it has the same components.

On the other hand, since each component is the same as in the first embodiment, a description of each component will be omitted below.

The driving device of the PDP according to the second embodiment of the present invention is a heating unit formed by a heating wire provided between the panel 30 and the heat sink 40 when the panel is lowered below a reference temperature (for example, approximately 15 ° C.). Heat is applied to the 58 to increase the temperature of the heat sink 40 by thermal conduction. In this way, the heat sink 40 and the panel 30 that are compressed in the high temperature also increases the temperature can be maintained above the reference temperature. Therefore, it is possible to prevent the bright spot mis-discharge generated because the particle movement is slowed when the PDP is operated at low temperatures.

FIG. 8 is a flowchart for explaining a method of driving the PDP driving apparatus illustrated in FIGS. 5 and 7.

Referring to FIG. 8, the temperature detector 52 detects the temperature of the panel once (step S100). The detected temperature of the panel is supplied to the controller 54. The controller 54 compares and determines whether the temperature of the supplied panel is equal to or less than a reference temperature (for example, approximately 15 ° C.) (step S200). Back to repeat the above process. If the temperature of the supplied panel is less than or equal to the reference temperature, the controller 54 supplies a control signal to drive the heating driver 56 (step S300). The heating unit 58 formed of a stripe-shaped heating wire generates heat. It may be installed between the 40. The panel lowered below the reference temperature by the heat generated by the heating unit can maintain the reference temperature (step S500). Therefore, the bright spot misdischarge generated at the low temperature is effectively removed.

As described above, according to the driving apparatus of the plasma display panel and the driving method thereof according to the present invention, when the plasma display panel is driven at a low temperature, the heating wire or panel formed on the rear surface of the heat sink is detected when the temperature of the panel is lowered below the reference temperature. The heat is supplied to the heating wire installed between the heat sink and the heat sink to keep the panel above the reference temperature. Accordingly, it is possible to prevent the bright point mis-discharge generated at low temperatures.

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

Claims (13)

Plasma display panel, A heating unit for heating the panel; A detector for detecting a temperature of the panel; And a control unit for driving the heating unit in response to the detection signal from the detection unit. The method of claim 1, And a heat sink attached to a rear surface of the panel. The method of claim 2, The heating unit, A heating wire installed on the heat sink; And a driving unit for heating the heating wire in response to the driving signal from the control unit. The method of claim 3, wherein The heating wire is a driving device of the plasma display panel, characterized in that installed on the back of the heat sink. The method of claim 3, wherein And the heating wire is disposed between the panel and the heat sink. The method of claim 5, wherein And the heating wire is disposed on a rear surface of the panel. The method of claim 3, wherein The hot wire is a drive device of a plasma display panel, characterized in that the mesh (Mesh) form. The method of claim 3, wherein The hot wire is a drive device of the plasma display panel, characterized in that the stripe form. The method of claim 1, And the control unit drives the heating unit such that the temperature of the panel is maintained at approximately 15 ° C. or higher. Detecting a temperature of the plasma display panel to which the heat sink is attached; Comparing the detected panel temperature with a reference temperature; And heating the panel according to the comparison result. The method of claim 10, The step of heating the panel, And heating the heating wire provided on the rear surface of the heat sink. The method of claim 10, The step of heating the panel, And heating the heating wire provided between the panel and the heat sink. The method of claim 10, And said reference temperature is approximately 15 [deg.] C.