KR20050022705A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to stabilize the panel and prevent a deterioration of screen quality of the panel by patterning address electrode structures differently in accordance with dielectric constant values of phosphors. CONSTITUTION: A plasma display panel comprises scan electrodes and sustain electrodes(208B) formed in parallel with each other in each of discharge cells arranged into a matrix; a red phosphor deposited in partial cells of the discharge cells; and green and blue phosphors deposited in the discharge cells formed in the vicinity of the discharge cell where the red phosphor is deposited. An address electrode(232X) in each of the discharge cells has a width set by the phosphor deposited in the discharge cell where the address electrode is arranged. The address electrode disposed in the portion where the scan electrode and the address electrode intersect with each other, has a width wider than the width of the address electrode in another portion.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly to a method capable of stabilizing the discharge of the plasma display panel.

Plasma Display Panel (hereinafter referred to as "PDP") is characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Xe + Ne. Or an image including graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development.

In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view of a discharge cell structure of a typical three-electrode AC surface discharge type PDP, and FIG. 2 is a plan view of the discharge cell shown in FIG. 1.

1 and 2, the discharge cells of the three-electrode AC surface discharge type PDP are largely divided into the upper plate 10 and the lower plate 20, and the upper plate 10 and the lower plate 20 are installed in parallel with a predetermined distance from each other. do. An AC driving signal is supplied to the rear surface of the upper substrate 2 constituting the upper plate 10 so that the scan electrode 8A and the sustain electrode 8B which form a sustain surface discharge are formed side by side. The scan electrode 8A and the sustain electrode 8B are transparent electrodes formed transparently from indium tin oxide (hereinafter, referred to as “ITO”). Bus electrodes 12Y and 12Z having a line width smaller than the line widths of the scan electrode 8A and the sustain electrode 8B are formed side by side at one edge of the rear surface of each of the scan electrode 8A and the sustain electrode 8B. Since ITO has a high resistance value, a uniform voltage is applied to each discharge cell by supplying an AC signal through the bus electrodes 12Y and 12Z. An upper dielectric layer 4 is formed on the front surface of the upper substrate 2 on which the scan electrodes 8A and sustain electrodes 8B are formed. The upper dielectric layer 4 has a function of accumulating charges during discharge. The protective layer 6 is formed on the rear surface of the upper dielectric layer 4. The protective layer 6 protects the upper dielectric layer 4 from sputtering during discharge, extending the life of the pixel cell and improving the emission efficiency of secondary electrons. As the protective layer 6, magnesium oxide (MgO) is usually used.

On the lower substrate 22 constituting the lower plate 20, an address electrode 32X for address discharge is formed to cross at right angles to the scan electrode 8A and the sustain electrode 8B. In addition, as shown in FIG. 2, the address electrode 32X is patterned and formed on the lower substrate 22 regardless of the red (R), green (G), and blue (B) cells. On the lower substrate 22 and the address electrode 32X, a lower dielectric layer 24 is formed on the entire surface to form wall charges during discharge. In addition, the partition wall 26 is vertically formed between the upper plate 10 and the lower plate 20. The partition wall 26 forms the discharge space 34 of the cell together with the upper plate 10 and the lower plate 20, and separates the discharge cells from each other to block mutual interference between neighboring cells. The phosphor layer 28 is applied to the surfaces of the lower dielectric layer 24 and the partition wall 26. Here, the phosphor layer 28 may be excited by ultraviolet rays generated during plasma discharge to generate any one of red (R), green (G), and blue (B) visible light. The discharge cells are coated with phosphors of red (R), green (G) and blue (B). An inert mixed gas such as He + Xe, Ne + Xe or He + Xe + Ne for discharging is injected into the discharge space 34 of the discharge cell provided between the upper and lower substrates 2 and 22 and the partition wall 26. .

Briefly describing the light emission process, an address discharge occurs between the scan electrode 8A and the address electrode 32X to form wall charges in the upper and lower dielectric layers 4 and 24. The formed wall charges lower the discharge voltage required for surface discharge. In the cells selected by the address discharge, a sustain discharge is generated between the two electrodes 8A and 8B by an alternating current signal alternately supplied to the scan electrode 8A and the sustain electrode 8B. In this case, ultraviolet rays are generated in the discharge space 34 in the process of transition after the discharge gas is excited. The generated ultraviolet rays excite the phosphor layer 28 to generate visible light, thereby realizing an image of the PDP.

In such a conventional PDP, phosphors of red (R), green (G), and blue (B) have different dielectric constants. In fact, the permittivity of the red (R) and blue (B) phosphors is about the same, and the permittivity of the green (G) phosphor is set lower than that of the red (R) and blue (B) phosphors. Therefore, the surface potential of the green (G) phosphor having a relatively low dielectric constant is relatively higher than that of the red (R) and blue (B) phosphors.

In other words, the address driving voltage of the discharge cells implementing red (R) and blue (B) is about 165 ~ 190V, while the address driving voltage of the discharge cells implementing green (G) is about 175 ~ 190V. As described above, when the address driving voltage is different for each phosphor, there is a problem in that an incorrect discharge or an over discharge occurs during the address discharge.

Accordingly, an object of the present invention is to provide a plasma display panel capable of causing stable address discharge regardless of the permittivity of the phosphor.

In order to achieve the above object, the plasma display panel according to the present invention comprises a scan electrode and a sustain electrode formed in parallel with each other discharge cells arranged in a matrix form, a red phosphor applied to some of the discharge cells of the discharge cells, and The green and blue phosphors respectively applied to the discharge cells positioned adjacent to the discharge cells to which the red phosphors were applied, and the widths of the address electrodes of the respective discharge cells are set by the phosphors applied to the discharge cells in which they are installed. The width of the address electrode at the portion crossing the scan electrode is set to be wider than the width of the address electrode at the other portion.

In the plasma display panel according to the present invention, the width of the address electrode formed in the discharge cells coated with the green phosphor is set to be wider than the width of the address electrode formed in the discharge cells coated with the red and blue phosphors. do.

In the plasma display panel according to the present invention, the address driving margin of the address electrode is set to be substantially the same in the discharge cells in which the red, green, and blue phosphors are formed.

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. 3 and 4.

3 is a perspective view of a discharge cell structure of a PDP according to an embodiment of the present invention, Figure 4 is a plan view of the discharge cell shown in FIG.

3 and 4, the discharge cells of the PDP are largely divided into the upper plate 210 and the lower plate 220, and the upper plate 210 and the lower plate 220 are installed in parallel with a predetermined distance from each other. An AC driving signal is supplied to the rear surface of the upper substrate 202 constituting the upper plate 210 so that the scan electrode 208A and the sustain electrode 208B which form a sustain surface discharge are formed side by side. The scan electrode 208A and the sustain electrode 208B are transparent electrodes formed transparently from indium tin oxide (hereinafter, referred to as “ITO”). Bus electrodes 212Y and 212Z having a line width smaller than the line widths of the scan electrodes 208A and 208B are formed side by side at the rear edges of the scan electrodes 208A and the sustain electrodes 208B. Since ITO has a high resistance value, a uniform voltage is applied to each discharge cell by supplying an AC signal through the bus electrodes 212Y and 212Z.

An upper dielectric layer 204 is formed on the front surface of the upper substrate 202 on which the scan electrodes 208A and sustain electrodes 208B are formed. The upper dielectric layer 204 has a function of accumulating charge during discharge. A protective layer 206 is formed on the rear surface of the upper dielectric layer 204. The protective layer 206 protects the upper dielectric layer 204 from sputtering during discharge to extend the life of the pixel cell and improve emission efficiency of secondary electrons. As the protective layer 206, magnesium oxide (MgO) is usually used.

On the lower substrate 222 constituting the lower plate 220, an address electrode 232X for address discharge is formed to cross at right angles to the scan electrode 208A and the sustain electrode 208B. At this time, the address electrodes 232X formed on the back of the red (R), green (G), and blue (B) phosphors are red (R), green (G), and blue (B) phosphors as shown in FIG. 4. The width is determined corresponding to their dielectric constant. In other words, the width of the address electrode 232X overlapping with the green (G) phosphor having a low dielectric constant value is set wider than the width of the address electrode 232X overlapping with the red (R) and blue (B) phosphors. At this time, the address electrode 232X overlapping the green (G) phosphor extends to the edge of the scan electrode 208A causing the address discharge in synchronization with the address electrode 232X.

The lower dielectric layer 224 is entirely coated on the lower substrate 222 and the address electrode 232X to form wall charges during discharge. In addition, the partition wall 226 is vertically formed between the upper plate 210 and the lower plate 220. The partition wall 226 forms the discharge space 234 of the cell together with the upper plate 210 and the lower plate 220, and separates the discharge cells from each other to block mutual interference between neighboring cells. The phosphor layer 228 is coated on the surfaces of the lower dielectric layer 224 and the partition wall 226. The phosphor layer 228 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B). An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space 234 provided between the upper and lower substrates 202 and 222 and the partition wall 226.

In the PDP of the present invention as described above, the width of the address electrode 232X is set to correspond to the dielectric constant of the phosphor. Therefore, in the present invention, stable address discharge can be generated regardless of the dielectric constant of the phosphor.

In detail, by setting the width direction of the address electrode 232X overlapping with the green (G) phosphor having a low dielectric constant (that is, a high address driving voltage is required), stable address discharge can be caused during the address period. In other words, since the overlapping area between the address electrode 232X and the scan electrode 208A becomes wider, address discharge can occur more easily even at a lower address driving voltage than in the prior art. Here, the width of the address electrode 232X is red ( R) and the address driving margin in the discharge cells in which the blue (B) phosphor is formed and the address driving margin in the discharge cells in which the green (G) phosphor is formed are set to be approximately equal.)

As described above, the plasma display panel according to the present invention patterns the address electrode structure differently according to the dielectric constant value of each phosphor so that discharge can occur uniformly, thereby stabilizing the plasma display panel, thereby improving the image quality of the plasma display panel. Can prevent the degradation.

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.

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

2 is a plan view of the discharge cell shown in FIG.

3 is a perspective view showing a discharge cell of the AC surface discharge type plasma display panel according to an embodiment of the present invention.

4 is a plan view of the discharge cell shown in FIG.

<Explanation of symbols for the main parts of the drawings>

2, 202: upper substrate 4, 204: upper dielectric layer

6, 206: protective layer 8A, 208A: scanning electrode

8B, 208B: sustain electrode 10, 210: top plate

12Y, 12Z, 212Y, 212Z: Bus electrode

20, 220: Lower board 22, 222: Lower board

24, 224: lower dielectric layer 26, 226: partition wall

28, 228: phosphor layer 32X, 232X: address electrode

34, 234: discharge space

Claims (3)

A scan electrode and a sustain electrode formed to be parallel to each other for each discharge cell arranged in a matrix form; A red phosphor applied to some of the discharge cells; Green and blue phosphors respectively applied to discharge cells positioned adjacent to the discharge cells to which the red phosphors are applied; The width of the address electrode of each of the discharge cells is set by a phosphor coated on the discharge cell in which the discharge electrode is installed, and the width of the address electrode in the portion crossing the scan electrode is wider than the width of the address electrode in the other portion. Plasma display panel, characterized in that set. The method of claim 1, And the width of the address electrode formed in the discharge cell coated with the green phosphor is set wider than the width of the address electrode formed in the discharge cell coated with the red and blue phosphors. The method of claim 2, And the address driving margin of the address electrode is set to be substantially the same in discharge cells in which red, green, and blue phosphors are formed.