KR20040023192A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve aperture ratio by adapting a grid type barrier rib, while achieving improved visible property and brightness property. CONSTITUTION: A plasma display panel comprises a scan electrode(Y7) and a sustain electrode(Z7). The scan electrode includes a transparent electrode(79a) having a wide width and a metal bus electrode(79b) connected to the transparent electrode and inclined toward the center of cells. The sustain electrode includes a transparent having a wide width and a metal bus electrode connected to the edge of the transparent electrode. The metal bus electrode of the sustain electrode is arranged on a barrier rib(23) for defining a discharge cell.

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 in which an aperture ratio is improved while employing a lattice type partition wall.

Typically, a plasma display panel (hereinafter referred to as a 'PDP') is a vacuum ultra violet (VUV) light source of 147 nm generated during gas discharge of He + Xe, Ne + Xe, He + Ne + Xe, or the like. By emitting the phosphor, an image including a character or a graphic is displayed. Such PDPs are attracting attention as large-area flat panel displays because they are easily thinned and large in size, and recently, commercial production of companies has begun to expand the large-screen display market.

1 and 2 illustrate a structure of a PDP of a three-electrode alternating current (AC) type which is commonly used.

Referring to FIG. 1, the upper and lower glass substrates 1 and 2 are arranged in parallel at regular intervals. The mixed gas is injected into the discharge space between the upper and lower glass substrates 1 and 2. The phosphor 5 that emits light upon discharge of the mixed gas is applied onto the lower glass substrate 2. An upper dielectric layer 6 and a protective layer 7 are stacked on the upper glass substrate 1, and a sustain electrode in which a metal bus electrode 9b is bonded in the longitudinal direction between the upper glass substrate 1 and the upper dielectric layer 6. The pairs Y and Z are arranged side by side in the direction orthogonal to the address electrode X. The lower dielectric layer 4 is stacked on the lower glass substrate 2, and the address electrode X is disposed therebetween. On the lower dielectric layer 4, the partition 3 is extended with the address electrode X interposed therebetween.

The address electrode X formed on the lower glass substrate 2 generates an address discharge when a voltage is applied to one of the address electrode X and the sustain electrode pairs Y and Z to select a cell.

The partition walls 3 formed on the address electrodes X block electrical and optical interference between cells and provide discharge spaces along with upper and lower glass substrates 1 and 2 inside the cells.

The phosphor 5 coated on the partition 3 is excited by a short-wavelength vacuum ultraviolet ray generated at the time of discharge to generate a visible color of intrinsic color, so that the three primary colors of light in each cell are red, green, and blue (R, G). , B).

The upper and lower dielectric layers 6 and 4 serve to accumulate charge during discharge. The protective layer 7 serves to protect the upper dielectric layer 6 from sputtering of plasma particles during discharge, and is mainly made of magnesium oxide (MgO).

The sustain electrode pairs Y and Z maintain the discharge by causing the sustain discharge by the sustain voltage applied to the sustain electrode pairs Y and Z following the address discharge. The transparent electrode 9a constituting each of the sustain electrode pairs Y and Z is formed of a transparent conductive material (eg, Indium-Tin-Oxide; ITO) having a light transmittance of 90% or more. Most of the visible light emitted by (5) passes. However, a material such as ITO has a high light transmittance but a low conductivity, so the resistance value is too large, so that power cannot be efficiently transferred. In order to solve this problem, a metal bus electrode 9b made of a good conductive material such as Ag or Cu is provided on the transparent electrode 9a. The metal bus electrode 9b lowers the resistance of the sustain electrode pairs Y and Z to prevent voltage drop due to the high resistance of the transparent electrode 9a.

In the conventional PDP, barrier ribs of cells coated with R, G, and B phosphors emitting red, green, and blue light are mostly stripe-type barrier ribs, as shown in FIGS. 3A and 3B. The PDP employing the stripe-type partition wall has been widely used in the conventional PDP because of its excellent exhaust characteristics. However, in the PDP employing the stripe-type partition wall, the phosphor is applied only to two surfaces of the cell, thereby limiting the amount of phosphor applied. In addition, the PDP employing the stripe-type partition wall has a problem that the discharge of the discharge and cross-talk between the cells is caused as the PDP becomes higher. On the other hand, in the case of a PDP employing a grid-type partition wall, as shown in FIG. 4, phosphors are applied to the four surfaces and the bottom surface surrounding the cell to emit more visible light than a PDP employing a stripe-type partition wall. Since the cell is surrounded by four surfaces, even if the PDP is fixed, the discharge and crosstalk between the cells are prevented. Accordingly, in order to improve mis-discharge and decrease in brightness between cells, grating type barrier ribs are used in PDPs.

In order to further improve the luminance, the PDP employing the lattice-type partition wall has an electrode structure in which the metal bus electrodes 49b of the sustain electrodes Z4 and Z4 'of two cells vertically adjacent to each other are integrated into one, as shown in FIG. 5A. Developed. The electrode formed by integrating the sustain electrode across two cells as described above is called a common sustain electrode. The PDP employing the common sustain electrodes Z4 and Z4 'has a YZZY arrangement of two pairs of sustain electrodes, that is, a scan electrode (Y4), a sustain electrode (Z4), a sustain electrode (Z4'), and a scan electrode (2). Y4 ') in order to reduce the capacitance (Capacitance) between the scan electrode (Y4) and the sustain electrode (Z4) in one cell. The PDP employing the common sustain electrodes Z4 and Z4 'emits light in the cell by forming the metal bus electrodes 49b of the sustain electrodes Z4 and Z4' on the partition 23 as shown in FIG. 5B. Only one metal bus electrode to block visible light is positioned in the cell area. As a result, the PDP employing the common sustain electrodes Z4 and Z4 'significantly increases the light transmittance while consuming the same power, thereby greatly improving the luminance characteristics compared to the conventional PDP.

However, the PDP employing the common sustain electrodes Z4 and Z4 'is formed close to the partition 23 in the case of the metal bus electrode 49b of the scan electrode Y4 located in one cell region, and the sustain electrode Z4 is formed. Since the metal bus electrode 49b of () is formed to overlap the partition 23, when the cell is observed from a distance, two adjacent cells up and down are seen as one cell. In detail, the metal bus electrodes 49b of the scan electrodes Y4 and Y4 'are formed close to the partition 23 in two adjacent cells up and down and look thick as one, while the sustain electrodes Z4 and Z4' Since the metal bus electrode 49b is formed to overlap on the partition 23, only the partition 23 looks thin when viewed from a distance. As a result, since the two adjacent cells up and down in the distance are seen as one cell, the screen display area of the PDP becomes uneven, which may give a starting burden to the user of the PDP.

In this case, the PDP driven by the interlace driving method alternately supplies signals applied to the even-numbered scan electrodes and the odd-numbered scan electrodes, so that a common scan electrode pair having two upper and lower adjacent scan electrodes as one is formed. It is also possible to employ. On the other hand, when the PDP is driven in a progressive driving method, since a signal applied to each scan electrode is sequentially supplied, one scan electrode should be formed in one cell. That is, it is impossible to employ a common scan electrode pair in the PDP driven by the progressive driving method. However, the PDP driven by the interlace driving method has a disadvantage in that a process circuit that classifies and processes the data in the even-numbered and the odd-numbered methods is added, compared to the PDP driven by the progressive driving method. In addition, since the PDP driven by the progressive driving method is easier to control than the PDP driven by the interlace driving method, this method has been applied to many PDPs.

As a result, in a PDP adopting a grid-type partition wall and driving in a progressive driving method, the luminance characteristics and the efficiency characteristics, which are advantages of the PDP employing a common sustain electrode, can be obtained, and the aperture ratio can be improved by making the cells appear uniform. There is a need for a way to make it possible.

Accordingly, it is an object of the present invention to provide a plasma display panel in which an aperture ratio is improved while employing a lattice type partition wall.

1 is a perspective view showing a conventional AC surface discharge plasma display panel.

FIG. 2 is a cross-sectional view illustrating the plasma display panel shown in FIG. 1.

3 is a plan view illustrating plasma display panels having a stripe-type partition wall.

4 is a plan view illustrating a plasma display panel having a conventional grid type partition wall.

5A is a plan view illustrating a common sustain electrode pair in a conventional plasma display panel having a lattice type partition wall structure.

5B is a cross-sectional view of the plasma display panel illustrated in FIG. 5A.

6 is a plan view illustrating a structure of a sustain electrode pair and a barrier rib structure in a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a structure of a sustain electrode pair and a barrier rib structure in the plasma display panel illustrated in FIG. 6.

<Brief description of symbols for the main parts of the drawings>

1: upper glass substrate 2: lower glass substrate

3,23: partition 4: lower dielectric layer

5: phosphor 6: upper dielectric layer

7: protective layer 9, 19: sustain electrode pair

9a, 19a, 49a, 79a: transparent electrodes 9b, 19b, 49b, 79b: metal bus electrodes

X: address electrode Y, Y4, Y7: scan electrode

Z, Z4, Z7: Sustain electrode

In order to achieve the above object, the plasma display panel according to the present invention has a scan electrode and a sustain electrode, and the scan electrode includes a wide transparent electrode and a metal bus electrode connected to the transparent electrode and biased toward the center of the cell. It is done.

The sustain electrode has a wide transparent electrode and a metal bus electrode connected to the edge of the transparent electrode.

The metal bus electrode of the sustain electrode is located on the partition wall partitioning the discharge cells.

In the plasma display panel according to the present invention, the distance between the scan electrode located in one discharge cell and the sustain electrode located in another discharge cell adjacent thereto is larger than the distance between the sustain electrode and the scan electrode located in one discharge cell. do.

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 6 and 7.

Referring to FIG. 6, in the PDP according to the embodiment of the present invention, the metal bus electrode 79b of the scan electrode Y7 is positioned at the center of the cell, and the metal bus electrode of the sustain electrode Z7 is positioned. 79b has sustain electrode pairs Y8 and Z8 overlapping the horizontal partition wall 23a.

The scan signal for scanning the panel and the sustain signal for discharging the sustain are mainly supplied to the scan electrodes Y7 of the sustain electrode pairs Y7 and Z7, and the sustain signal for discharging and sustain is mainly supplied to the sustain electrode Z7. . The metal bus electrodes 79b of each of the sustain electrode pairs Y7 and Z7 are positioned at the center of the cell and at one edge of the cell, and are formed of a highly conductive metal material such as silver (Ag) or copper (Cu). The transparent electrodes 79a of the wide sustain electrode pairs Y8 and Z8 connected to the metal bus electrode 79b are formed to face each other in the cell region.

In the grid type partition wall formed to partition the cell region, the horizontal partition walls 23a formed in the horizontal direction and the vertical partition walls (not shown) formed in the vertical direction cross each cell so as to be surrounded by the partition walls of four sides.

The PDP according to the embodiment of the present invention includes sustain electrode pairs Y and Z having a modified pattern compared to the conventional PDP shown in FIGS. 1 and 2. Therefore, the PDP according to the embodiment of the present invention can be manufactured according to the conventional manufacturing process by modifying the pattern of the mask for manufacturing the sustain electrode pair without an additional process.

In the sustain electrode pairs Y7 and Z7 employed in the PDP according to the embodiment of the present invention, as shown in FIG. 7, the metal bus electrode 79b of the sustain electrode Z7 overlaps the horizontal partition wall 23a and the scan electrode is provided. The metal bus electrode 79b of Y7 is located at the center of the cell. Thus, only one metal bus electrode 79b is left in the cell to reduce light transmittance. Accordingly, in the PDP according to the embodiment of the present invention, the amount of visible light blocked by the metal bus electrode formed in the cell area is reduced as compared with the conventional PDP, so that more visible light is emitted to the screen display area. Therefore, the luminance characteristic of the PDP according to the embodiment of the present invention is improved. As a result, the PDP according to the embodiment of the present invention improves the efficiency characteristic because the luminance characteristic is improved while consuming the same power as the conventional PDP.

At this time, the PDP according to the embodiment of the present invention is different from the scan electrode Y7 of one cell at the boundary between the upper and lower adjacent cells in addition to the discharge between the sustain electrode pairs Y7 and Z7 occurring in one discharge cell according to the electrode arrangement. Misdischarge between the sustain electrodes Z8 of the cell may occur. Therefore, in order to prevent such mis-discharge, the gap g2 between the scan electrode Y7 of one cell and the sustain electrode Z8 of another cell adjacent to the cell must be larger than the gap g1 of the pairs of sustain electrodes Y7 and Z7 in the cell. (Eg g2 is 1.5 to 2 times larger than g1). In addition, the sustain electrodes Z7 and Z8 partially overlapping the horizontal partition walls 23a should be sufficiently overlapped with the horizontal partition walls 23a to prevent the sustain electrodes Z7 and Z8 from being located in adjacent cells. In addition, when the driving voltage is applied to the PDP, an electric field is strongly applied near the metal bus electrode 79b, so that the metal bus electrode 79b of the scan electrode Y7 is biased toward the center of the cell. This is because when the metal bus electrode 79b of the scan electrode Y7 is disposed close to the center of the cell, the distance from the metal bus electrode 79b of the adjacent cell is farther away, thereby reducing the probability of false discharge. Further, when the metal bus electrode 79b of the scan electrode Y7 is formed to be biased toward the center of the cell, the wall charges formed on the partition wall during the discharge of the address electrode X can be easily formed and applied to the address electrode X. The address voltage, which is the driving voltage, is lowered. Further, when the discharge cells are viewed from a distance due to the metal bus electrode 79b of the scan electrode Y7 formed at the center of the cell, the cells are symmetrically seen, so that the two cells are one as in the conventional PDP employing the common sustain electrode. Visible phenomenon is prevented. That is, the PDP according to the embodiment of the present invention further improves the visual characteristics of the panel.

Accordingly, in the PDP according to the embodiment of the present invention, the metal bus electrode 79b of the sustain electrode Z7 is formed on the horizontal partition wall 23a, and the metal bus electrode 79b of the scan electrode Y7 is positioned at the center of the cell. As a conventional PDP employing a common sustain electrode, the number of metal bus electrodes located in a cell is reduced to improve the brightness and efficiency characteristics of the PDP. Also, two adjacent cells are displayed as one cell so that an uneven screen is displayed. This will prevent the phenomenon.

As described above, the PDP according to the present invention superimposes one metal bus electrode of the pair of sustain electrodes located in the cell region on the partition wall, and places the other metal bus electrode in the center of the cell, compared to the PDP employing the conventional common sustain electrode. This prevents the appearance of unevenness. That is, the PDP according to the embodiment of the present invention further improves the visual characteristics of the panel.

In addition, the PDP according to the embodiment of the present invention further improves the luminance characteristics of the PDP like the PDP adopting the common sustain electrode pair by reducing the number of metal bus electrodes positioned in one cell. Accordingly, the PDP according to the embodiment of the present invention improves the efficiency characteristic because the luminance characteristic is improved while consuming the same power as the conventional PDP.

Therefore, the PDP according to the embodiment of the present invention has the advantage of overcoming the disadvantages of the conventional PDP employing the common metal bus electrode and improving luminance and efficiency characteristics.

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 (4)

In a plasma display panel having a scan electrode and a sustain electrode, The scan electrode, Wide transparent electrode, And a metal bus electrode connected to the transparent electrode and biased toward the center of the cell. The method of claim 1, The sustain electrode, Wide transparent electrode, And a metal bus electrode connected to an edge of the transparent electrode. The method of claim 2, The metal bus electrode of the sustain electrode, Plasma display panel, characterized in that located on the partition wall partitioning the discharge cells. The method of claim 1, The interval between the scan electrode located in one discharge cell and the sustain electrode located in another discharge cell adjacent thereto is And a gap between the sustain electrode and the scan electrode located in one discharge cell.