KR100272604B1 - Structure for discharge electrode of plasma display panel - Google Patents

Abstract

The present invention relates to a discharge electrode of a plasma display panel. The present invention is connected to the first bus electrode, the second bus electrode, and the first bus electrode which are continuously formed at predetermined intervals on a predetermined substrate in order to prevent a decrease in luminous efficiency which is a problem in the conventional plasma display panel. A first discharge electrode formed of a branch branched in width and a second portion extending in a second width that is larger than the first width and extending from the branch portion and having a width smaller than the second width, the end portion extending in the third width; Characterized in that it comprises a second discharge electrode formed at a predetermined distance from the end of the discharge electrode. The present invention having this feature is used to develop a high efficiency plasma display panel by generating a positive light ultraviolet.

Description

Discharge electrode structure of plasma display panel

The present invention relates to a plasma display panel (hereinafter referred to as a plasma display panel), and more particularly to a discharge electrode of a plasma display panel.

PD and LCD are spotlighted as next generation display devices with the highest practicality among flat panel displays. In particular, PDP has higher luminance and wider viewing angle than LCD, and thus has wide applicability as a thin, large display such as an outdoor advertising tower, a wall-mounted TV, or a theater display.

1 illustrates a cross-sectional structure of a typical three-electrode surface discharge type AC PDP. The Y electrode 25 and the Z electrode 26 are formed on the same surface of the front glass substrate 10, and the Y electrode and the Z electrode are formed. A dielectric layer 27 is formed on the electrode by a printing method, and an Xg electrode 21 is formed on the upper glass substrate 20 having the MgO protective layer formed on the dielectric layer 27 by vapor deposition. In order to prevent crosstalk between adjacent cells between the electrodes 21, a partition 23 is formed, and a phosphor 24 is formed around the partition 23 and the X electrode 21. And a discharge region in which an inert gas is sealed in the space between the superstructure and the understructure. 1 illustrates a structure of a PD, in which the upper structure is rotated 90 degrees for convenience of description.

In the three-electrode surface discharge type AC PD, first, when a driving voltage is applied between the X electrode 21 and the Y electrode 25, an opposite discharge occurs between the X electrode 21 and the Y electrode 25, so Wall charges are generated on the surface of the protective layer 28 of the structure. When the discharge voltages having opposite polarities are continuously applied to the Y electrode 25 and the Z electrode 26 and the driving voltage applied to the X electrode 21 is cut off, as shown in FIG. As a result, the discharge is maintained between the Y electrode 25 and the Z electrode 26. The electric field is concentrated in the region (1) between the discharge electrodes and decreases toward the end (②) of the discharge electrode. As a result, the discharge current is represented by a waveform as shown in FIG.

At this time, when the discharge holding voltage is applied to the bus wiring 25 'of the Y electrode and the bus wiring 26' of the Z electrode, the dielectric layer 27 and the protective layer on the Y electrode 25 and the Z electrode 26 are applied. (28) Surface discharge occurs in the discharge area on the surface. As a result, ultraviolet rays are generated from the inert gas in the discharge region. The phosphor 24 is excited by the ultraviolet rays, and color display is performed by the emitted phosphor 24.

That is, while the electrons inside the discharge cell accelerate to the cathode (-) by the applied driving voltage, helium (He) is filled with the inert mixed gas filled with the pressure of about 400 to 500 torr in the discharge cell. As the main component, it collides with a Penning mixed gas to which xenon (Xe), neon (Ne) gas, etc. are added, and the inert gas is excited to generate ultraviolet rays having a wavelength of 147 nm. Such ultraviolet rays collide with the phosphor 24 surrounding the X electrode 21 and the partition 23 to emit light in the visible light region.

The PD discharges the cells constituting the pixel by controlling the application of voltages to the X electrode, the Y electrode, and the Z electrode, and the amount of light emitted by the discharge changes the discharge time of the cell. Adjust In other words, the gray scale required for image display is realized by varying the length of time each cell is discharged within the time required to display the entire image (1/30 second in the case of NTSC TV signal). . At this time, the brightness of the screen is determined by the brightness when each cell is discharged to the maximum. In addition, in order to maximize the luminance of the PD screen, it is necessary to keep the discharge time of the cell as long as possible within the time necessary for constructing one screen.

However, the conventional PD has a problem that the distance between the electrodes of the discharge region is shorter than that of the general discharge tube display device, and thus, the PD cannot utilize ultraviolet rays in the positive column region having good luminous efficiency.

This is because, as shown in FIG. 3, the discharge current generated at the discharge electrode at a position ② far from the field concentration region is significantly lower than the discharge current generated at the discharge electrode at the field concentration region ①. As a result, the conventional PD has a short discharge period and generates only ultraviolet rays in the negative glow region, but does not generate ultraviolet rays in the positive pillar region. That is, since the conventional PD uses only ultraviolet rays in a negative glow region, the luminous efficiency is not good, and thus the screen is not brighter than a general discharge tube, thereby degrading image quality.

The present invention has been made in order to provide a discharge electrode structure of PDPD which can utilize ultraviolet rays in the positive light region to solve this problem.

1 is a view schematically showing the structure of a conventional three-electrode surface discharge plasma display panel;

FIG. 2 is a diagram illustrating that an electric field and a discharge generated between a pair of discharge electrodes are diffused.

3 is a view showing waveforms of discharge current generated by the electric field of FIG.

4 is a view showing waveforms of discharge current generated in the plasma display panel of the present invention;

5 is a view schematically showing the structure of a plasma display panel of the present invention.

6 illustrates a discharge electrode having a structure having a third width wider than the first width in the structure of the plasma display panel of the present invention.

Explanation of symbols for main parts of the drawings

100: partition 200: first discharge electrode

200 ': second discharge electrode 210: branch portion of first discharge electrode

210 ': branch portion of the second discharge electrode 220: center portion of the first discharge electrode

220 ': center portion of second discharge electrode 230: end portion of first discharge electrode

230 ': end portion of the second discharge electrode 300: first bus electrode

300 ': second bus electrode

The present invention is characterized in that the width of the discharge electrode is formed non-uniformly, thereby controlling the discharge current formed in the discharge electrode to generate ultraviolet rays in the positive column region.

5 is connected to the first bus electrode 300, the second bus electrode 300 ', and the first bus electrode 300 which are continuously formed on a predetermined substrate as shown in FIG. The first portion formed by the branch portion 210 and the central portion 220 extended from the branch portion to a second width that is greater than the first width and the width smaller than the second width are formed of the end portion 230 extending to the third width. The discharge electrode 200 and the second discharge electrode 200 ′ formed at a predetermined distance from the end of the first discharge electrode 200 are included. At this time, the space in which the first discharge electrode 200 and the second discharge electrode 200 'are formed is separated by the partition wall 100 to form a discharge cell.

The first bus electrode 300 and the second bus electrode 300 ′ are continuously formed on a predetermined substrate at predetermined intervals. Since the first bus electrode 300 and the second bus electrode 300 ′ are the same as those of a conventional PD, a detailed description thereof will be omitted.

The first discharge electrode 200 corresponding to the features of the present invention has at least two widths. As shown in FIG. 5, the first discharge electrode 200 of the present invention extends into a branch 210 branched from the first bus electrode 300 to a first width and a second width branched from the branch 210. Consists of the central portion 220, the end portion 230 extending from the central portion 220 to the third width. At this time, the second width is larger than the first width and the third width. In addition, the first width and the third width may be configured to be the same or the third width may be configured to be wider than the first width. That is, the width of the center portion of the first discharge electrode 200 of the present invention is formed larger than the width of the end. 6 illustrates a discharge electrode having a structure in which a third width is wider than that of the first width.

The second discharge electrode 200 ′ of the present invention is preferably formed in the same shape as the first discharge electrode 200. That is, the second discharge electrode 200 ′ of the present invention is connected to the second bus electrode 300 ′ similarly to the first discharge electrode 200 and branched to the fourth width 210 ′, and the fourth discharge electrode 200 ′. A central portion 220 'extended from the branch portion 210' extending to a fifth width larger than the width thereof and a width smaller than the fifth width are formed of the end portion 230 'extending to the sixth width. In this case, the fourth width and the sixth width may be configured to be the same, and the sixth width may be configured to be wider than the fourth width.

The operation principle of the present invention will be described.

First, when a discharge occurs between the end portion 230 of the first discharge electrode 200 and the end portion 230 'of the second discharge electrode 200', it is along the surface of the dielectric layer (not shown). Wall charges are formed. An electric field is concentrated between the end portions 230 and 230 ′ of the first discharge electrode 200 and the second discharge electrode 200 ′. At this time, the potential inside the discharge cell is lowered by the wall charges, thereby lowering the discharge current.

However, in the discharge cells constituted by the first and second discharge electrodes 200 and 200 ′, the discharge current is increased by the discharge electrodes having a wider width than the electric field concentration region. Therefore, the effect of lowering the discharge current of the center portion 220, 220 ′ of the discharge electrode is offset by the effect of increasing the discharge current, compared to the discharge current of the electric field concentration region consisting of the end portions 230, 230 ′ of the discharge electrode. do. As a result, the discharge of the discharge cell constructed by the present invention is maintained for a long time to generate ultraviolet rays in the positive light column region.

The PD of the present invention has a wider width in the center portion of the discharge electrode formed in the field diffusion region than the end portion of the discharge electrode formed in the field concentration region, thereby increasing the discharge current of the field diffusion region. As a result, the PD of the present invention diffuses the discharge region and generates ultraviolet rays in the positively divided region, which is not generated in the conventional PD, so that the luminous efficiency and luminance are higher than those of the conventional PD.

Claims (6)

A first bus electrode and a second bus electrode continuously formed on a predetermined substrate at predetermined intervals, A branch portion connected to the first bus electrode and branched to a first width and extending to a second width larger than the first width and extending to the center portion and a third width smaller than the second width; A first discharge electrode formed with an extended end, and The discharge electrode structure of the plasma display panel comprising a second discharge electrode formed at a predetermined distance from the end of the first discharge electrode. The method of claim 1, The second discharge electrode A branch connected to the second bus electrode and branched to a fourth width, a central portion extended to a fifth width that is greater than the fourth width and extended from the branch, and a sixth width smaller than the fifth width; Discharge electrode structure of the plasma display panel, characterized in that formed by the end extending in the width. The method of claim 2, And a fourth width and a sixth width of the discharge electrode structure of the plasma display panel. The method of claim 1, And the sixth width is wider than the fourth width. The method of claim 1, The first electrode and the third width is the same structure of the discharge electrode of the plasma display panel. The method of claim 1, And the third width is wider than the first width.