KR100340075B1 - Plasma display panel and driving method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a high brightness, high efficiency plasma display panel (hereinafter referred to as a PDP) and a method of driving the same, which decrease the scan time of an address period and relatively increase the time between sustain discharges. will be. According to an aspect of the present invention, a plasma display panel comprising: a plurality of scan electrodes; A plurality of sustain electrodes arranged in pairs with the scan electrodes; A plurality of first address electrodes disposed to intersect the scan electrode and the sustain electrode and to apply a data pulse to induce a sustain discharge at an intersection point of the odd-numbered scan electrode and the sustain electrode; And a plurality of second address electrodes arranged to intersect the scan electrode and the sustain electrode, and to apply a data pulse to induce a sustain discharge at an intersection point of the even-numbered scan electrode and the sustain electrode. A plasma display panel is provided.

Description

Plasma display panel and its driving method {PLASMA DISPLAY PANEL AND DRIVING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a high brightness, high efficiency plasma display panel (hereinafter referred to as a PDP) and a method of driving the same, which decrease the scan time of an address period and relatively increase the time between sustain discharges. will be.

Recently, with the development and spread of information processing systems, the importance of displays has increased, and research and development of various flat displays having a matrix structure have been actively performed. Among them, PDP is being spotlighted as the next generation of large screen displays. The PDP has a large screen and a small thickness, and has been applied to wall-mounted TVs, home theater displays, and various monitors.

In addition, the PDP is classified into an alternating current (AC) type and a direct current (DC) type according to the type of driving voltage. The AC type PDP is driven by a sine wave AC voltage or a pulse voltage, and the DC type PDP is It is driven by DC voltage.

1 is an electrode arrangement diagram of a three-electrode surface discharge PDP, which is one of the most commonly used AC PDPs.

As shown in FIG. 1, a typical three-electrode surface discharge PDP has a scan electrode group (3, Y electrode group) to which a scan pulse is applied during an address period, and a sustain pulse is applied to maintain a discharge. Address electrode group (2, A electrode group) to which data pulses are applied to cause sustain discharge between sustain electrode group (4, X electrode group) and scan line 3 and sustain electrode 4 of the selection line. The cell 5 is formed at a point where the pair of scan electrode groups 3 and the sustain electrode group 4, which are vertical electrodes, intersect the address electrode group 2, which is a horizontal electrode. To constitute a plasma display panel.

The basic driving principle of each cell of the three-electrode surface discharge PDP configured as described above is to generate an address discharge between the scan electrode 3 and the address electrode 2 so that wall charges are generated therein, and then maintain the scan electrode 3 and the sustain electrode. Sustain discharge is caused between the electrodes 4 to make the discharge gas into a plasma state to generate ultraviolet rays, and the ultraviolet rays excite the phosphor to generate visible light.

Meanwhile, the address display-period separation (ADS) subfield method, which is the most basic method for driving the three-electrode surface discharge PDP, will be described.

The ADP driving method of the PDP includes an initialization step of uniformly erasing all wall charges of the entire cell when the PDP is driven, a write discharge step (addressing) and a display for forming wall charges in cells at specific positions. The driving method is divided into three stages of the sustain discharge stage, that is, a write discharge is selectively performed on the discharge cells to be displayed. First, in the initialization step, a high voltage higher than the discharge start voltage V _f is applied between the scan electrodes Y ₁ to Y _m and the sustain electrodes X ₁ to X _m so that all display lines are irrelevant regardless of the previous display state. All the discharge cells are front-charged and continuously self-discharged to all the discharge cells of all the display lines using a long pulse but slightly lower than Vs (discharge sustain voltage), so that the charge distribution of all the discharge cells in the panel becomes wall charge. Reset to a uniform state without In the write discharge step, the sustain electrodes X ₁ to X _m maintain a constant potential, and perform selective write discharges between the scan electrodes Y ₁ to Y _m and the address electrodes A ₁ to A _n . When the selective write discharge is completed, discharge sustain voltage pulses having a constant Vs (discharge sustain voltage) level are commonly applied to each of the scan electrodes Y ₁ to Y _m and sustain electrodes X ₁ to X _m . The number of pulses applied at this time is differentiated for the gradation display which will be described later. After all three steps are completed, the process returns to the initialization step and is repeated.

One cycle is configured through three periods of the reset period for performing the initialization step, the address period for performing the write discharge step, and the sustain discharge period (or sustain period) for performing the sustain discharge step. For this purpose, one frame screen is divided into a plurality of subfield screens and displayed. Each of the subfield screens is composed of a reset period, an address period, and a sustain discharge period. Among them, the reset period and the address period are all identically assigned to each subfield, but the sustain discharge period is digital image data displayed in the address period. Since they are differently assigned according to the bit weights of, the combination of the respective subfields using the integration effect of the eyes enables multi-gradation of the image.

2 is an explanatory diagram showing a general ADS subfield driving method of the PDP, wherein the X axis represents time and the Y axis represents scanning of the address electrode and the scan electrode.

The drawing shows a driving method in the case of displaying 256 gradations as an example of multi gradation display. In FIG. 2, one frame is divided into eight subfields SF1, SF2, SF3, SF4, SF5, SF6, SF7, SF8. In these subfields SF1 to SF8, the reset period and the address period are basically the same length, but the length of the sustain discharge period is 1 (2 ⁰ ): 2 (2 ¹ ): 4 (2 ² ): 8 (2 ³ ): 16 (2 ⁴ ): 32 (2 ⁵ ): 64 (2 ⁶ ): 128 (2 ⁷ ). Therefore, by appropriately selecting a subfield to be lit within one frame, it is possible to realize gray levels having different luminance in 256 steps from 0 to 255. For example, the sustain period of the first tone when is ^20, that is, the first sub-field (SF1) of sustain discharge using only the period, and 100 gray levels when the third, sixth, seventh subfields (SF3, SF6, SF7) of In the 256 gray scale implementation, the sustain discharge period of all eight subfields is used.

Meanwhile, as shown in FIG. 2, the time portion occupied by the address period in each subfield is the largest in ADS driving. For example, in a 42-inch VGA class PDP, an address period per subfield occupies about 1.2 ms, that is, an address period per frame occupies about 10 ms.

FIG. 3 is a diagram showing scan pulses applied to the scan electrodes for selective write discharge in the address period, showing only one subfield.

In the figure, the pulses Y1 to Y480 of the scan electrodes applied for the selective write discharge for the cell in the address period for about 1.2 ms have a pulse width of about 2.5 [mu] s and are sequentially applied without being overlapped with each other.

However, in the ADS subfield type PDP driving, the time occupied by the address period in each subfield is relatively longer than the sustain discharge period. Thus, the time during which one discharge cell is turned on is shortened. The brightness and efficiency are lowered.

The present invention has been proposed to solve the above problems of the prior art, and provides a plasma display panel capable of driving with high brightness and high efficiency by reducing the scan time of an address period and relatively increasing the time between sustain discharges, and a driving method thereof. Have a purpose

1 is an electrode layout of a typical three-electrode surface discharge PDP.

2 is an explanatory diagram showing a general ADS subfield driving method of a PDP.

3 illustrates a scan pulse applied to a scan electrode for selective write discharge in an address period.

4 is an electrode layout of the surface discharge PDP according to an embodiment of the present invention.

5 illustrates a scan pulse applied to a scan electrode group during selective write discharge according to the present invention.

6 is a pulse waveform diagram of a scan electrode and first and second address electrodes for scanning a discharge cell according to the present invention;

* Explanation of symbols for the main parts of the drawings

3: scan electrode group 4: sustain electrode group

20: first address electrode group 22: second address electrode group

According to an aspect of the present invention for achieving the above object, a plasma display panel comprising: a plurality of scan electrodes; A plurality of sustain electrodes arranged in pairs with the scan electrodes; A plurality of first address electrodes disposed to intersect the scan electrode and the sustain electrode and to apply a data pulse to induce a sustain discharge at an intersection point of the odd-numbered scan electrode and the sustain electrode; And a plurality of second address electrodes arranged to intersect the scan electrode and the sustain electrode, and to apply a data pulse to induce a sustain discharge at an intersection point of the even-numbered scan electrode and the sustain electrode. A plasma display panel is provided.

According to another aspect of the present invention, in the plasma display panel driving method, a scan pulse is applied to the odd-numbered scan electrode to which the first discharge cell belongs and the first address electrode to which the first discharge cell belongs. And applying a data pulse to the even-numbered scan electrode to which the second discharge cell belongs, and applying a data pulse to the second address electrode to which the second discharge cell belongs. A method of driving a panel is provided.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. do.

FIG. 4 is a layout view of electrodes of a surface discharge PDP according to an embodiment of the present invention. The scan electrode group 3 (Y and Y electrodes) to which a scan pulse is applied during an address period and the sustain electrode to which a sustain pulse is applied to maintain a discharge are shown. A first address electrode group 20 and A1 electrode to which data pulses are applied to cause a sustain discharge between the group 4 and the X electrode, the odd-numbered scan electrode group 3 and the sustain electrode group 4; And a second address electrode group 22 (A2 electrode) to which a data pulse is applied to cause sustain discharge between the even-numbered scan electrode group 3 and the sustain electrode group 4.

That is, any one discharge cell according to the present invention includes two address electrodes on the back substrate between the partition walls, and an odd number of scan electrode groups in the address period (Y1, Y3, ...) in the address period to shorten the time period of the address period. Is discharged from the first address electrode group 20 during the scan, and is discharged from the second address electrode group 22 during the scan of the even-numbered scan electrode groups (Y2, Y4, ... in the drawing).

FIG. 5 is a diagram illustrating a scan pulse applied to a scan electrode group during selective write discharge according to the present invention, showing only one subfield.

In the figure, each scan pulse applied to the scan electrode groups Y1 to Y480 has a pulse width of about 2.5 [mu] s sufficient for selective write discharge for the cell in the address period, and is superimposed and applied to each other so that the address period in the subfield is increased. Unlike the prior art, it is reduced to about 0.6 ms.

In general, the pulse width of the scan pulse applied between the scan electrode and the address electrode in the address period of the 42-inch VGA-type PDP is about 2.5 ㎲, which is a stable discharge between the two electrodes and a stable discharge in the sustain period. It is to guarantee.

6 is a pulse waveform diagram of a scan electrode and first and second address electrodes for scanning a discharge cell according to the present invention.

In the figure, a scan pulse and a data pulse are applied to discharge the scan electrode Y1 and the first address electrode A11 in the period t1, and the scan electrode Y1 and the first address electrode A11 in the period t2. Discharge is continuously performed between them, and at the same time, a scan pulse and a data pulse are applied so that a discharge occurs between the scan electrode Y2 and the second address electrode A21. At this time, the normal discharge operation is generated by the scan pulse having a sufficient pulse width between the scan electrode Y2 and the second address electrode A21. In addition, a potential difference exists between the scan electrode Y1 and the second address electrode A21, the scan electrode Y2, and the first address electrode A11 by t2 hours, but the potential difference is appropriate in a period of which the pulse width is shorter than about 1 ms. In case of applying, normal addressing operation is possible because the wall charge needed in the maintenance period cannot be made.

In response to the above-described electrode pulse waveform of FIG. 6, the first address electrode group 20 is used when scanning the odd-numbered scan electrode groups (Y1, Y3, ... in the drawing) in the address period to shorten the time period of the address period. ) And discharged with the second address electrode group 22 when scanning even-numbered scan electrode groups (Y2, Y4, ... in the drawing), thereby ensuring stable write discharge in the address period and stable sustain discharge in the sustain period. To ensure.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

According to the present invention as described above, two address electrode groups are provided, and discharge driving is alternately performed between the scan electrode and the two address electrodes in accordance with the scan electrode, thereby reducing the scan time of the address period during ADS driving and maintaining the discharge period relatively. By increasing the time of the PDP can be driven with high brightness and high efficiency.

Claims (5)

In the plasma display panel, A plurality of scan electrodes; A plurality of sustain electrodes arranged in pairs with the scan electrodes; A plurality of first address electrodes disposed to intersect the scan electrode and the sustain electrode and to apply a data pulse to induce a sustain discharge at an intersection point of the odd-numbered scan electrode and the sustain electrode; And A plurality of second address electrodes arranged to intersect the scan electrode and the sustain electrode, and to apply a data pulse to induce a sustain discharge at an intersection point of the even-numbered scan electrode and the sustain electrode; Plasma display panel having a. delete In the method of driving a plasma display panel of claim 1, Applying a scan pulse to the odd-numbered scan electrode to which the first discharge cell belongs and applying the data pulse to the first address electrode to which the first discharge cell belongs; And applying a scan pulse to the even-numbered scan electrode to which the second discharge cell belongs and applying a data pulse to the second address electrode to which the second discharge cell belongs. The method of claim 3, And a scan pulse applied to the odd-numbered scan electrode to which the first discharge cell belongs, and a scan pulse applied to the even-numbered scan electrode to which the second discharge cell belongs to overlap each other. Method of driving. delete