KR20030062798A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve the video quality of the plasma display panel by arranging and intersecting address electrodes with a zigzag pattern. CONSTITUTION: A plasma display panel includes a first and a second sustain driving blocks(52,54) for driving the first electrode(Y), a third sustain driving block(56) for driving the second electrode(Z) and a first and a second address driving blocks(58,60) for driving the address electrode(X). The plasma display panel further includes an upper portion(62), a lower portion(64) and a panel(50). In the plasma display panel, the first sustain driving block(52) drives the first electrodes(Y1 to Ym/2) formed on the upper portion(62). The second sustain driving block(54) drives the first electrodes(Ym/2+1 to Ym) formed on the lower portion(64). And, the third sustain driving block(56) drives the second electrodes(Z1 to Zm) formed on the upper portion(62).

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving image quality.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include Liquid Crystal Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP), and Electro-Luminescence (EL). And display devices.

PDP is a display device using a gas discharge has the advantage that it is easy to manufacture a large panel. As a PDP, a three-electrode AC surface discharge type PDP having three electrodes and driven by an alternating voltage is typical.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP has a first electrode 12Y and a second electrode 12Z formed on the upper substrate 10, and an address formed on the lower substrate 18. An electrode 20X is provided.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the first electrode 12Y and the second electrode 12Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. 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 18 on which the address electrode 20X is formed, and the phosphor 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the first electrode 12Y and the second electrode 12Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The three-electrode AC surface discharge type PDP is driven by being divided into a plurality of subfields, and gray scale display is performed by emitting light a number of times proportional to the weight of video data in each subfield period.

For example, when an image is displayed in 256 gray scales using 8-bit video data, one subframe display period (for example, 1/60 second = about 16.7 msec) is divided into eight subfields SF1 to SF8 as shown in FIG. Is divided into Each of the subfields SF1 to SF8 is further divided into a reset period RP, an address period AP and a sustain period SP, and 1: 2: 4: 8: ... in the sustain period SP. Weighted at a ratio of: 128.

Here, the reset period RP is a period for initializing the discharge cells, the address period AP is a period for causing selective address discharge to occur according to the logic value of the video data, and the sustain period SP is a period where the address discharge is changed. It is a period in which discharge is maintained in the generated discharge cells. The reset period RP and the address period AP are equally allocated to each subfield period.

In such a subfield driving method, the sustain period SP is a period for displaying an image, and a sufficient sustain period SP must be secured in order to give appropriate luminance. However, when the resolution is increased or the size of the screen is increased, the number of the first electrode Y and the second electrode Z of the PDP increases. Accordingly, there is a problem that the address period AP is increased and the sustain period is not sufficiently secured.

In addition, in the conventional subfield driving method, false contour noise occurs due to a mismatch between the integration direction of light and the visual characteristics recognized by the human eye. For example, pseudo contour noise is generated when gradation levels with large emission patterns such as 127-128, 63-64, 31-32, etc. are continuously displayed. Such pseudocontour noise usually appears in white or black band behavior.

In order to reduce pseudo contour noise, methods for increasing 10 or more subfields within a frame have been proposed. However, if the number of subfields is increased to ten or more, the address period AP and the reset period RP increase, which causes a problem in that sufficient time is not allocated to the sustain period SP.

In order to solve such a problem, the divided driving method as shown in FIG. 3 has been proposed. In the split drive PDP, the panel 30 is divided into an upper half 42 and a lower half 44 to be driven.

Referring to FIG. 3, first and second sustain drivers 32 and 34 for driving the first electrode Y, a third sustain driver 36 for driving the second electrode Z, and an address are shown. Address driving units 38 and 40 for driving the electrode X are provided.

The first sustain driver 32 drives the first electrodes Y1 to Ym / 2 formed in the upper half 42. The second sustain driver 34 drives the first electrodes Ym / 2 + 1 to Ym formed in the lower half 44. The third sustain driver 36 drives the second electrodes Z1 to Zm formed in the panel 30.

The first address driver 38 drives the first address electrodes X11 to X1n formed in the upper half 42. The second address driver 40 drives the second address electrodes X21 to X2n formed in the lower half 44.

In the split driving PDP, the first electrodes Y formed on the upper half 42 and the lower half 44 are simultaneously scanned. In other words, when the scan pulse is supplied to the first first electrode Y1 formed in the upper half 42, the scan pulse is applied to the m / 2 + 1 th first electrode Ym / 2 + 1 formed in the lower half 44. Is supplied.

In this manner, in the split driving PDP, the addressing time can be shortened by half by simultaneously driving the upper half 42 and the lower half 44. However, in the conventional divided driving PDP, the discharge is unevenly generated in the discharge cells located at the boundary between the upper half 42 and the lower half 44.

In detail, the space charges generated by the address discharge or the sustain discharge of the specific discharge cell 46 are supplied to the next discharge cell 48 along the address electrode X11. In addition, the space charges generated by the address discharge of the next discharge cell 48 are also supplied to the next discharge cell along the address electrode X11.

In other words, the space charges generated in the discharge cells are moved along the address electrode X to the next adjacent discharge cell. That is, the address electrode X provides a path through which space charges can move. However, the first and second address electrodes X11 to X1n and the second address electrodes X21 to X2n are spaced apart from each other at a boundary between the upper half 42 and the lower half 44 as shown in FIG. 4. Therefore, the space charges of the upper half 42 moving along the first address electrodes X11 to X1n are not supplied to the lower half 44.

In other words, the discharge cells formed along the m / 2th first electrode Ym / 2 may discharge space charges to the discharge cells formed along the m / 2 + 1th first electrode Ym / 2 + 1. Can not supply Therefore, a predetermined space charge is accumulated in the discharge cells formed along the m / 2th first electrode Ym / 2. In addition, the discharge cells formed along the m / 2 + 1 th first electrode Ym / 2 + 1 are not supplied with space charge from the discharge cells formed along the m / 2 th first electrode Ym / 2. can not do it.

Therefore, in the conventional split driving method, the discharge conditions of the discharge cells formed at the boundary between the upper half 42 and the lower half 44 become uneven, and thus there is a problem in that image quality is deteriorated.

Accordingly, an object of the present invention is to provide a plasma display panel capable of improving image quality.

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

2 is a view showing a driving method of a conventional plasma display panel.

3 is a view showing a conventional divided plasma display panel.

4 is a diagram illustrating an address electrode formed at a boundary of FIG. 3;

5 illustrates a plasma display panel according to an embodiment of the present invention.

6 is a diagram illustrating an address electrode formed at a boundary of FIG. 5;

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y: first electrode

12Z: second electrode 14, 22: dielectric layer

16: protective film 18: lower substrate

20X: address electrode 24: partition wall

26 phosphor layer 30, 50 panel

32, 34, 36, 52, 54, 56: sustain driver 38, 40, 58, 60: address driver

42,62: upper half 44,64: lower half

46,48: discharge cell

In order to achieve the above object, the plasma display panel of the present invention includes first address electrodes formed at the boundary between the upper half and the lower half, and second address electrodes formed at the boundary.

The first address electrode and the second address electrode intersect at a boundary portion.

The first address electrode and the second address electrode cross in a zigzag at a boundary portion.

A first sustain driver for driving first electrodes formed to intersect the first address electrode in the upper half, a second sustain driver for driving first electrodes formed to intersect the second address electrode in the lower half, and an upper half And a third sustain driver for driving the second electrodes formed in parallel with the first electrodes in the lower half.

And a first address driver for driving the first address electrodes and a second address driver for driving the second address electrodes.

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 6.

5 is a diagram illustrating a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 5, a PDP according to an embodiment of the present invention may include first and second sustain drivers 52 and 54 for driving the first electrode Y, and a second for driving the second electrode Z. Referring to FIG. The third sustain driver 56 and first and second address drivers 58 and 60 for driving the address electrodes X are provided.

The first sustain driver 52 drives the first electrodes Y1 to Ym / 2 formed in the upper half 62. The second sustain driver 54 drives the first electrodes Ym / 2 + 1 to Ym formed in the lower half 64. The third sustain driver 56 drives the second electrodes Z1 to Zm formed in the panel 50. Meanwhile, the third sustain driver 56 is divided to drive the second electrodes Z1 to Zm / 2 formed in the upper half 62 and the second electrodes Zm / 2 + 1 to Zm formed in the lower half 64, respectively. Can be.

The first address driver 58 drives the first address electrodes X11 to X1n formed in the upper half portion 62. The second address driver 60 drives the second address electrodes X21 to X2n formed in the lower half 64.

In the PDP according to the embodiment of the present invention, the first electrodes Y formed on the upper half 62 and the lower half 64 are simultaneously scanned. In other words, when the scan pulse is supplied to the first first electrode Y1 formed in the upper half 62, the scan pulse is applied to the m / 2 + 1 th first electrode Ym / 2 + 1 formed in the lower half 64. Is supplied.

As described above, the first and second address electrodes X of the PDP of the present invention are formed to cross each other in a zigzag form at the boundary between the upper half 62 and the lower half 64 as shown in FIG. 6. In detail, the first address electrodes X11 to X1n formed on the upper half 62 are formed to the boundary between the upper half 62 and the lower half 64. In this case, the first address electrodes X11 to X1n do not overlap with the m / 2 + 1th first electrode Ym / 2 + 1 formed in the lower half 64 to prevent mis-discharge.

In addition, the second address electrodes X21 to X2n formed on the lower half 64 are formed to the boundary between the upper half 62 and the lower half 64. In this case, the second address electrodes X21 to X2n do not overlap with the m / 2th first electrode Ym / 2 formed in the upper half portion 62 to prevent mis-discharge.

As such, when the first and second address electrodes X are formed to intersect in a zigzag form at the boundary between the upper half 62 and the lower half 64, the space charge generated by the address discharge or the sustain discharge generated in the upper half 62 is formed. Can be moved to the lower half 64. Therefore, even in the boundary part of the panel 50, uniform discharge can be produced.

In other words, the space charges generated in the discharge cells formed along the m / 2th first electrode Ym / 2 are formed by the address electrodes X formed to intersect in a zigzag form. It is supplied to one electrode (Ym / 2 + 1). Therefore, in the present invention, the discharge condition is uniform at the boundary between the upper half 62 and the lower half 64, whereby the image quality can be improved.

As described above, according to the plasma display panel according to the present invention, the address electrodes formed on the upper half and the address electrodes formed on the lower half are arranged so as to intersect in a zigzag at the boundary between the upper half and the lower half. As such, when the address electrodes are arranged in a zigzag intersection at the boundary between the upper half and the lower half, the space charges generated in the upper half along the scanning direction may move to the upper half. Therefore, the discharge conditions of the discharge cells formed at the boundary between the upper half and the lower half become uniform, thereby improving image quality.

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 (5)

In the plasma display panel which is divided into the upper half and the lower half to be driven, First address electrodes formed at a boundary between the upper half and the lower half; And second address electrodes formed at the boundary portion. The method of claim 1, And the first address electrode and the second address electrode intersect at the boundary. The method of claim 2, And the first address electrode and the second address electrode cross zigzag at the boundary. The method of claim 1, A first sustain driver for driving first electrodes formed to intersect the first address electrode in the upper half; A second sustain driver for driving first electrodes formed to intersect the second address electrode in the lower half; And a third sustain driver for driving the second electrodes formed in parallel with the first electrodes in the upper half and the lower half of the plasma display panel. The method of claim 1, A first address driver for driving the first address electrodes; And a second address driver for driving the second address electrodes.