KR20000066855A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to realize a natural color by controlling easily a color balance of each discharge cell. CONSTITUTION: A plasma display panel comprises a plurality of first bus electrode(100), a plurality of second bus electrode(100'), a plurality of first transparent electrode(110), and a second transparent electrode(110'). The first bus electrodes and the second bus electrodes are formed continuously on an upper substrate. The first transparent electrodes are connected to each first bus electrode. The first transparent electrodes comprises a first width, a second width, and a third width according to a constant distance. The second transparent electrode is connected to the second bus electrode. The second transparent electrode is formed between the second bus electrode and the first transparent electrode.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a sustain electrode structure of a plasma display panel.

Plasma display panels and liquid crystal displays (LCDs) are spotlighted as next generation display devices with the highest practicality among flat panel display devices. In particular, the plasma display panel has a higher luminance and wider viewing angle than a liquid crystal display device, and thus has wide applicability as a large, thin display such as an outdoor advertising tower, a wall display TV, or a theater display.

In the typical three-electrode surface discharge plasma display panel, as shown in FIG. 1A, the upper substrate 10 and the lower substrate 20 installed to face each other are bonded to each other. FIG. 1B illustrates a cross-sectional structure of the plasma display panel illustrated in FIG. 1A, and the lower substrate 20 is rotated by 90 ° for convenience of description.

The upper substrate 10 is a dielectric layer for coating the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' formed in parallel with each other, and the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17'. And a protective film 12, wherein the lower substrate 20 is formed between the address electrode 22 and the dielectric film 21 formed on the entire surface of the substrate including the address electrode 22, and the address electrode 22. As shown in FIG. A partition 23 formed on the dielectric film 21 of the dielectric film 21, and a phosphor 23 formed on the surface of the partition wall 23 and the dielectric film 21 in each discharge cell. The upper substrate 10 and the lower substrate 20 The space between) is filled with an inert gas such as helium (He), xenon (Xe), etc. at a pressure of about 400 to 500 Torr to form a discharge region.

The scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' are made of transparent electrodes 16 and 17 and a metal bus as shown in FIGS. 2A and 2B to increase light transmittance of each discharge cell. It consists of electrodes 16 'and 17'. FIG. 2A is a plan view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16', and FIG. 2B is a sectional view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16'. The bus electrodes 16 'and 17' receive a discharge voltage from an external driving IC, and the transparent electrodes 16 and 17 receive a discharge voltage applied to the bus electrodes 16 'and 17' and are adjacent to each other. It causes discharge between (16, 17). The overall width of the transparent electrodes 16 and 17 is about 300 micrometers (µm) indium oxide or tin oxide, and the bus electrodes 16 'and 17' are made of chromium (Cr) -copper (Cu) -chromium. It consists of three thin films comprised of (Cr). At this time, the width of the bus electrode 16 ', 17' lines is set to approximately one third the width of the transparent electrode 16, 17 line.

The operation of the three-electrode surface discharge type AC plasma display panel is the same as that shown in FIGS. 3A to 3D.

First, when a driving voltage is applied between the address electrode and the scan electrode, a counter discharge occurs between the address electrode and the scan electrode as shown in FIG. 3A, and some of the electrons discharged from the inert gas in the discharge cell are lost due to the counter discharge. Impinge on the protective layer surface as shown in 3b. Due to the collision of electrons, electrons are secondarily emitted from the surface of the protective layer. The secondary electrons collide with the gas in the plasma state to diffuse the discharge. When the opposite discharge between the address electrode and the scan electrode is completed, wall charges of opposite polarities are generated on the surface of the protective layer on the address electrode and the scan electrode as shown in FIG. 3C.

When the discharge voltages having opposite polarities are continuously applied to the scan electrode and the sustain electrode, and the driving voltage applied to the address electrode is blocked at the same time, the potential difference between the scan electrode and the sustain electrode as shown in FIG. Surface discharge occurs in the discharge region on the surface of the dielectric layer and the protective layer. Due to the opposite discharge and the surface discharge, electrons present in the discharge cell collide with the inert gas inside the discharge cell. As a result, ultraviolet rays having a wavelength of 147 nm are generated in the discharge cells while the inert gas of the discharge cells is excited. The ultraviolet rays collide with the phosphor surrounding the address electrode and the partition wall to operate the plasma display panel.

At this time, the closer the distance between the scan electrode and the sustain electrode, the stronger the electric field between the electrodes, the higher the brightness of the discharge cell. However, when the discharge voltage is increased, the power consumption of the plasma display panel is increased, so that the interval between the scan electrode and the sustain electrode is set to the most appropriate level through experiments.

However, in the conventional plasma display panel, when the same discharge voltage is applied to all the discharge cells, the luminance of the blue discharge cells is lowered relative to the red discharge cells and the green discharge cells. This is because the blue phosphor has a lower luminous efficiency when ultraviolet rays of the same intensity are generated as compared with the red phosphor and the green phosphor. As a result, the image of the conventional plasma display panel has a problem that the color reproduction range is narrow and does not properly implement the natural color.

An object of the present invention is to provide a plasma display panel that can easily adjust the color balance of a red discharge cell and a green discharge cell with brightness of a blue discharge cell.

1A is a perspective view illustrating a structure of a general plasma display panel.

1B is a cross-sectional view showing the structure of the plasma display panel shown in FIG. 1A.

Figure 2a is a plan view showing the structure of the sustain electrode provided on the upper substrate.

Figure 2b is a cross-sectional view showing the structure of the sustain electrode provided on the upper substrate.

3A to 3D show the operation of the discharge cells in the write discharge section.

4 is a view showing the structure of a sustain electrode according to the present invention.

Symbol description for main parts of drawing

100: first bus electrode (bus electrode of the first sustain electrode)

100 ': second bus electrode (bus electrode of the second sustain electrode)

110: first transparent electrode (transparent electrode of the first sustain electrode)

110 ′: second transparent electrode (transparent electrode of second sustain electrode)

The present invention is characterized in that the distance of the sustain electrode formed in the blue discharge cell is different from the distance of the sustain electrode formed in the red discharge cell and the green discharge cell.

The sustain electrode of the plasma display panel according to the present invention is connected to the first bus electrode 100, the second bus electrode 100 ', and the first bus electrode 100, which are continuously formed at regular intervals, A plurality of first transparent electrodes 110 and a second bus electrode 100 ′ formed to sequentially have a first width, a second width, and a third width, and are connected to the second bus electrode 100 ′ and the first bus width. It has a structure including a second transparent electrode 110 ′ formed between the transparent electrodes 110.

Hereinafter, the detailed structure of the present invention is as shown in FIG.

Since the first bus electrode 100 and the second bus electrode 100 ′ of the present invention may be formed directly on the upper substrate or may be formed on the transparent electrode, the first bus electrode 100 and the second bus electrode 100 ′ may be formed on the upper substrate, and thus the detailed description thereof will be omitted. .

Although not shown in the drawings, barrier ribs orthogonal to the first and second bus electrodes are continuously formed at regular intervals, and the first transparent electrode 110 has a different width for each of the regions divided by the barrier ribs, that is, for each discharge cell. Formed. That is, the first transparent electrode 110 may have a first width, a second width, or a third width of the region divided by the partition wall.

At this time, the width of the first transparent electrode 110 is set differently depending on the phosphor to be formed in each discharge cell. As described above, among the general phosphors formed in the plasma display panel, the luminance of the blue phosphors is relatively lower than that of the red phosphors and the green phosphors under the same discharge voltage. Therefore, it is preferable to increase the luminance by applying a higher discharge voltage to the discharge cell in which the blue phosphor is formed than the discharge cell in which the other phosphor is formed.

In addition, the second transparent electrode 110 ′ may also be formed to have a variable width corresponding to the variable width of the first transparent electrode 110. That is, in the discharge cell having the first transparent electrode 110 having the first width, the second transparent electrode 110 'has the fourth width, and the discharge cell having the first transparent electrode 110 having the second width The second transparent electrode 110 'is formed to have a fifth width, and the discharge cell including the first transparent electrode 110 having a third width is formed to have a second transparent electrode 110' to have a sixth width.

Thus, as shown in FIG. 4, the distance S1 between the portion of the first transparent electrode 110 having the first width and the portion of the second transparent electrode 110 'having the fourth width and the first having the second width are shown. The distance S2 between the portion of the transparent electrode 110 and the portion of the second transparent electrode 110 'having the fifth width, and the second transparent portion having the sixth width and the portion of the first transparent electrode 110 having the third width The distance S3 between the portions of the electrode 110 'is configured differently.

As a result, the discharge voltage between the portion of the first transparent electrode 110 having the third width and the portion of the second transparent electrode 110 'having the sixth width is the portion of the first transparent electrode 110 having the first width; The discharge voltage between the portion of the second transparent electrode 110 'having the fourth width, or the portion of the first transparent electrode 110 having the second width and the portion of the second transparent electrode 110' having the fifth width. It is higher than the discharge voltage.

In the drawings, the distances S1 and S2 between the first and second transparent electrodes of the discharge cell in which the red phosphor is formed and the discharge cell in which the green phosphor is formed are different from each other. The gaps S1 and S2 between the first and second transparent electrodes of the formed discharge cells may be the same. This is because, when the same discharge voltage is applied, the emission luminances of the red phosphor and the green phosphor are almost similar.

Hereinafter, the operation principle of the plasma display panel according to the present invention is as follows.

First, the plasma display panel according to the present invention includes a first sustain electrode and a first sustain electrode which are continuously formed on the upper substrate at regular intervals and sequentially have a first width, a second width, and a third width at regular intervals. And a second sustain electrode formed to be paired with the electrodes one by one and having the fourth width, the fifth width, and the sixth width in turn.

As shown in FIG. 4, the first sustaining electrode and the second sustaining electrode are composed of bus electrodes 100 and 100 ′ and transparent electrodes 110 and 110 ′, respectively. As shown in FIG. 4, the transparent electrode 110 ′ of the second sustain electrode and the second sustain electrode are formed to have the closest distance from each other in the discharge cell having the blue phosphor.

The structure of the plasma display panel according to the present invention is preferably configured such that the distance between each transparent electrode of the first sustain electrode and the second sustain electrode is the same in the discharge cell in which the red phosphor is formed and the discharge cell in which the green phosphor is formed.

When the discharge voltages having opposite polarities are applied to the bus electrode 100 of the first sustain electrode and the bus electrode 100 'of the second sustain electrode, an electric field is formed between each transparent electrode of the first sustain electrode and the second sustain electrode. Is formed and discharge is carried out. In this case, the intensity of the electric field formed in the gap S3 between the transparent electrodes of the discharge cells in which the blue phosphor is formed is higher than the gaps S1 and S2 between the transparent electrodes in the discharge cells in which the phosphors are formed. Therefore, the discharge cell in which the blue phosphor is formed discharges a little earlier than the discharge cell in which the red phosphor or the green phosphor is formed.

Therefore, since the luminance of the discharge cell in which the blue phosphor is formed is maintained at almost the same level as the brightness of the discharge cell in which the other phosphor is formed, the color balance can be easily adjusted. High quality images are realized.

The sustain electrode of the plasma display panel according to the present invention has an effect of further increasing the luminance of the discharge cell in which the blue phosphor is formed compared with the conventional sustain electrode. Therefore, the color balance of each discharge cell can be easily adjusted, so that the color temperature can be increased and more natural colors can be realized. Thus, the image quality of the plasma display panel can be uniformed compared to the conventional sustain electrode.

Claims (5)

A plurality of first bus electrodes and second bus electrodes continuously formed at regular intervals on the upper substrate; A plurality of first transparent electrodes connected to each of the first bus electrodes and formed to have a first width, a second width, and a third width in sequence for every predetermined length, and And a second transparent electrode connected to the second bus electrode and formed between the second bus electrode and the first transparent electrode. The method of claim 1, wherein the second transparent electrode And a fourth width corresponding to the first width of the first transparent electrode, a fifth width corresponding to the second width, and a sixth width corresponding to the third width. The plasma display panel of claim 2, wherein the fourth width and the fifth width are the same, and the sixth width is different from the fourth width and the fifth width. The plasma display panel of claim 1, wherein the first width and the second width are the same and the third width is different from the first width and the second width. The method of claim 1, wherein the first distance between the portion having the third width in the first transparent electrode and the portion corresponding to the third width in the second transparent electrode is the first width in the first transparent electrode, or And a distance between a portion having a second width and a portion corresponding to the first width or the second width in the second transparent electrode.