KR20010048585A - Plasma Display Panel Drived with High Frequency Signal - Google Patents

Abstract

PURPOSE: A high frequency plasma display panel is provided to minimize a diffusion of a discharge and a leakage current between electrodes. CONSTITUTION: In a high frequency plasma display panel, the first electrode(82) has a wide electrode width in a discharge center part. The second electrode(86) has a broad electrode width in the part crossed with the first electrode to cause an address discharge with the second electrode. An upper substrate(72) includes a high frequency electrode to apply a high frequency voltage. An under substrate includes the first and second electrodes. A barrier rip(68) is formed perpendicularity to the under substrate. The first dielectric layer(64) is formed between the under substrate and the second electrode. The second dielectric layer(65) is formed on the second dielectric layer. A protection layer(67) is formed on the second dielectric layer. A fluorescent substance layer is formed on the barrier rip.

Description

High Frequency Plasma Display Panel {Plasma Display Panel Drived with High Frequency Signal}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency plasma display panel, and more particularly, to a high frequency plasma display panel which minimizes diffusion of discharge and leakage current between electrodes.

Plasma Display Panel (hereinafter referred to as "PDP") is a display device in which ultraviolet light generated by gas discharge excites a phosphor to generate visible light from the phosphor. PDP has advantages such as thin, light, high-definition large screen and wide viewing angle compared to cathode ray tube (CRT), which has been the dominant display device. The PDP consists of discharge cells arranged in a matrix.

Referring to FIG. 1, the upper substrate 24 on which the sustain electrode pairs 26A and 26B and the metal bus electrode pairs 27A and 27B are arranged side by side, the lower substrate 32 on which the data electrodes 34 are formed, A conventional three-electrode surface discharge type PDP having a partition 36 extending vertically from the substrate 32 is shown. The dielectric layer 28 and the passivation layer 30 are stacked on the upper substrate 24 on which the sustain electrode pairs 26A and 26B and the metal bus electrode pairs 27A and 27B are formed. The data electrode 34 is formed on the lower substrate 32 in a direction orthogonal to the sustain electrode pairs 26A and 26B. The dielectric layer 33 and the partition 36 are formed on the lower substrate 32 on which the data electrode 34 is formed. Phosphor 37 is coated on the partition 36 and the dielectric layer 33. A mixed gas of He + Xe or Ne + Xe is injected into the discharge space 38 provided between the upper substrate 24, the lower substrate 32, and the partition 36.

The three-electrode surface discharge type PDP displays an image or an image by a so-called address and display separation (hereinafter referred to as "ADS") in which the data writing period and the display period are divided in time. First, an address discharge occurs between one of the sustain electrode pairs 26A and 26B and the data electrode 34 to generate charged particles in the discharge space 38, and the charged particles remain as wall charges on the dielectric layer 28. . In the cells selected by the address discharge, the sustain discharge is caused by the AC signal supplied to the sustain electrode pairs 26A and 26B. The AC signal supplied to the sustain electrode pairs 26A and 26B is a pulse signal of 200 Hz to 300 Hz. After the discharge gas is excited by this sustain discharge, it is transitioned to the ground state, and ultraviolet rays are generated, and the ultraviolet rays excite the phosphor 37 again. Then, after the phosphor 37 is excited, it transitions to the ground state and generates any visible light of red, green, and blue.

Such a three-electrode surface discharge type PDP is generated only once at a very short moment of discharge for each sustain pulse during sustain discharge. Accordingly, in the three-electrode surface discharge PDP, most of the discharge time is consumed as a preparation step for the formation of the wall charge and the next discharge, thereby lowering the discharge efficiency. In order to solve this problem, a PDP (hereinafter referred to as "RF PDP") has been proposed in which address discharge is caused by an AC signal of low frequency and sustain discharge is caused by a high frequency signal. In the RF PDP, a high frequency signal is applied during the sustain discharge period to vibrate electrons in the discharge space to continuously ionize the discharge gas. As a result, continuous discharge is performed for most of the discharge time.

2, an upper substrate 72 on which a high frequency electrode 74 is formed, a lower substrate 60 on which a scan electrode 66 and a data electrode 62 are orthogonal to each other, and a lower substrate 60. An RF PDP is shown having a partition wall 68 extending vertically in the phase. The high frequency electrode 74 is supplied with a high frequency signal for high frequency discharge during sustain discharge. The dielectric layer 73 is formed on the upper substrate 72 on which the high frequency electrode 74 is formed. The dielectric layer 73 serves to protect the high frequency electrode 74 from discharge and to accumulate wall charges. Data is supplied to the data electrode 62 in the address period. The first lower dielectric layer 64 is formed on the lower substrate 60 on which the data electrode 62 is formed. The first lower dielectric layer 64 electrically insulates the data electrode 62 from the scan electrode 66 and accumulates wall charges. The scan electrode 66 is formed on the first lower dielectric layer 64 in a direction parallel to the high frequency electrode 74 to cause an address discharge with the data electrode 62 in the address period, and also to maintain the high frequency electrode 74 with the high frequency during sustain discharge. Will cause a discharge. The second lower dielectric layer 65 is formed on the entire surface of the first lower dielectric layer 64 on which the scan electrodes 66 are formed. A protective layer 67 is formed on the second lower dielectric layer 65 to lower the discharge voltage by emitting the dielectric layer protection and secondary electrons during discharge. Discharge gas is injected into the discharge space 76 provided by the upper substrate 72, the lower substrate 60, and the partition wall 68. The partition wall 68 is formed in a lattice form to divide the discharge space in units of cells. The phosphor 70 is applied only to the partition wall 70 so as not to interfere with the address discharge between the scan electrode 66 and the data electrode 62 and to transmit visible light through the upper substrate 72.

In the RF PDP, a case of displaying an image or an image by the ADS method will be described below. First, an AC signal is applied to the data electrode 62 and the scan electrode 66 of the cell to be selected during the address period, so that address discharge occurs in the corresponding cell. At this time, video data is supplied to the data electrode 62, and a scan pulse synchronized with the video data is applied to the scan electrode 66. By this address discharge, charged particles are generated in the discharge space 76. On the other hand, since the high frequency signal is always applied to the high frequency electrode 72, among the charged particles formed during the address discharge, electrons vibrate in the discharge space 76 according to the electric field of the high frequency signal. The vibrating electrons excite the discharge gas continuously, and the ultraviolet rays generated at this time emit the phosphor 70. In order to cancel this high frequency discharge, a positive erase pulse signal having a level less than a voltage capable of causing a discharge is applied to the scan electrode 66 and the data electrode 62. Then, the electrons vibrating in the discharge space 76 move toward the scan electrode 66 and the data electrode 62 by the erase pulse and lose energy due to recombination with the positive charge or collision with the lower dielectric layer 65. do.

However, the RF PDP has a problem in that crosstalk and leakage current between electrodes are generated due to discharge diffusion during address discharge because the scan electrode 66 and the data electrode 62 cross each other with the dielectric layer 65 interposed therebetween. .

Referring to FIG. 3, the discharge diffusion during the address discharge in the absence of the partition wall 68 is shown. The discharge should occur only at the intersection portion 80 of the scan electrode 66 and the data electrode 62 during the address discharge, but only a desired cell can be selected. However, as shown in FIG. 3, when the address is discharged, the discharge is diffused along the scan electrode 66 and the data electrode 62 to cause crosstalk between adjacent cells. Even if the partition wall 68 exists, a gap of several μm or more is formed between the partition wall 68 and the upper dielectric layer 73, so that the discharge diffuses along the electrode line, so that charged particles, that is, charges are diffused and accelerated. By moving to the adjacent cells by affecting the electric field of the adjacent cells. Such discharge diffusion is mainly caused by the electrode widths of the scan electrodes 66 and the data electrodes 62. The electrode width of the scan electrode 66 is approximately 200 µm or less, and the electrode width of the data electrode 62 is formed approximately 100 µm or less. As described above, since the electrode widths of the scan electrodes 66 and the data electrodes 62 are minute, the equipotential surfaces are narrow during discharge, thereby facilitating diffusion of charged particles between adjacent cells. In order to reduce the discharge spreading, if the electrode width is greatly increased, the distance between the electrodes and the partition wall is narrowed, and thus the discharge efficiency is reduced such that the charged particles generated during the discharge collide with the partition wall 68 to disappear or recombine. In addition, if the electrode width is largely increased, as shown in Equation 1 below, the capacitance C between electrodes increases in proportion to the electrode width s, thereby causing a problem that the leakage current i ₁ becomes large.

Where ε is the dielectric constant of the dielectric layers 64 and 65, s is the electrode width (electrode face) of the scan electrode 66 and the data electrode 66 and d is the electrode of the scan electrode 66 and the data electrode 66 Interval between them.

Accordingly, an object of the present invention is to provide an RF PDP which minimizes the spread of discharge and leakage current between electrodes.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a discharge cell structure of a surface discharge plasma display panel of a conventional AC driving method.

2 is a perspective view showing a conventional high frequency plasma display panel.

Fig. 3 is an enlarged image showing discharge spreading at the time of address discharge by an electron microscope.

4 is a perspective view showing a high frequency plasma display panel according to an embodiment of the present invention.

5A through 5D are plan views illustrating the method of manufacturing the scan electrode and the data electrode shown in FIG.

<Description of the code | symbol about the principal part of drawing>

24,72: upper substrate 26A, 26B: sustain electrode pair

27A, 27B: metal bus electrode pair 28, 33, 64, 65, 73: dielectric layer

30,67: protective layer 32,60: lower substrate

34, 62, 82: data electrode 38, 76: discharge space

36,68: bulkhead 37,70: phosphor

66,86 scan electrode 74 high frequency electrode

82a: data auxiliary electrode 82b, 86b: line portion

86a: scan auxiliary electrode 92: data electrode line pattern

96: scan electrode line pattern 80: intersection of scan electrode and data electrode

In order to achieve the above object, the RF PDP according to the present invention has a wide electrode width at the intersection of the first electrode and the first electrode having a wide electrode width in the discharge center region, and causes an address discharge with the second electrode. A second electrode is provided.

Other objects and features of the present invention in addition to the above object will be 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. 4 and 5.

Referring to FIG. 4, the scan electrode 86 having the scan auxiliary electrode 86a formed thereon intersects with the scan electrode 86 and the data electrode having the data auxiliary electrode 86 formed adjacent to the scan auxiliary electrode 86a. An RF PDP according to the present invention having 82) is shown. The high frequency electrode 74 and the dielectric layer 73 formed on the upper plate portion, that is, the upper substrate 72, are substantially the same in structure and function as shown in FIG. The data electrode 82 and the data auxiliary electrode 82a are patterned and integrated with the same electrode material. The data electrode 82 includes a line portion 82b on which the data auxiliary electrode 82a extends. The data auxiliary electrode 82a extends wider than the line portion 82b on both sides of the bottom portion 82a corresponding to the bottom center portion of the discharge space 76, that is, the address discharge center portion 76a. Similarly, the scan electrode 86 and the scan auxiliary electrode 86a are patterned and integrated with the same electrode material. The scan electrode 86 includes a line portion 86b on which the scan auxiliary electrode 86a extends. The scan auxiliary electrode 86a extends wider than the line portion 86b at one side of the line portion 86a corresponding to the address discharge center in the discharge space 76. The scan electrode 86 is orthogonal to the data electrode 82 in such a manner that the scan auxiliary electrode 86a is located close to the data auxiliary electrode 82a in the address discharge center 76a.

The first lower dielectric layer 64 is formed on the lower substrate 60 on which the data electrode 82 is formed, and the second lower dielectric layer 65 has a flat surface on the first lower dielectric layer 64 on which the scan electrode 86 is formed. And a protective layer 67 are laminated. Discharge gas is injected into the discharge space 38 provided by the upper substrate 72, the lower substrate 60, and the partition wall 68. The partition wall 68 is formed in a lattice form to distinguish discharge spaces by cells, and a phosphor 70 is coated on the surface thereof.

The data electrode 82 and the scan electrode 86 are subjected to scan pulses synchronized with the video data and the video data during address discharge to generate address discharge. At this time, the size of the equipotential surface is increased by the scan auxiliary electrode 86a and the data auxiliary electrode 82a positioned at the address discharge center 76a to prevent diffusion of charged particles between adjacent cells during discharge. At the same time, since many charged particles and wall charges are formed during address discharge due to the increase of the equipotential surface, the voltage during sustain discharge, that is, high frequency discharge, can be reduced. In addition, the capacitance C between the scan electrode 86 and the data electrode 82 decreases as the intersecting electrode area decreases, thereby reducing the leakage current i ₁ .

5A through 5D illustrate a method of manufacturing the scan electrode and the data electrode shown in FIG. 4 in steps.

First, as shown in FIG. 5A, a data electrode line pattern 92 having a data auxiliary electrode 82a and a line portion 82b is formed on a substrate 60 by a screen printing or photolithography process. The first lower dielectric layer 64 is entirely formed on the substrate 60 on which the data electrode line pattern 92 is formed, as shown in FIG. 5B. Subsequently, a scan electrode line pattern 96 having the scan auxiliary electrode 86a and the line portion 86b is formed on the first lower dielectric layer 64. In this case, the scan electrode line pattern 96 is orthogonal to the data electrode line pattern 92, and the scan auxiliary electrode 86a is positioned close to the data auxiliary electrode 82a in the address discharge center 76a. Finally, the second lower dielectric layer 65 and the passivation layer 67 are sequentially formed on the first lower dielectric layer 64 on which the scan electrode line pattern 96 is formed.

As described above, the RF PDP according to the present invention forms auxiliary electrodes having a large electrode area on each of the scan electrode and the data electrode causing the address discharge, and arranges the auxiliary electrodes proximate the center of the address discharge to discharge the equipotential surface. Will increase the size of. Accordingly, not only the diffusion of charged particles between adjacent cells during address discharge is minimized, but also many charged particles and wall charges are formed, thereby lowering the discharge voltage and improving uniformity. In addition, the area of the electrode related to the discharge increases, but the electrode area of the intersecting portion decreases, so that the leakage current between the electrodes decreases.

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 (6)

A first electrode having a wide electrode width in the discharge center region, And a second electrode having a wide electrode width at an intersection with the first electrode to generate an address discharge with the second electrode. The method of claim 1, An upper substrate on which a high frequency electrode to which a high frequency voltage is applied is formed; A lower substrate on which the first and second electrodes are formed; And a barrier rib formed vertically on the lower substrate. The method of claim 2, The first electrode is a data electrode to which a data signal is supplied; And the second electrode is a scan electrode which causes an address discharge with the data electrode and causes a sustain discharge with the high frequency electrode. The method of claim 2, A first dielectric layer formed between the lower substrate on which the first electrode is formed and the second electrode; A second dielectric layer formed on the second dielectric layer, A protective layer formed on the second dielectric layer, And a phosphor layer formed on the partition wall. The method of claim 1, The first electrode includes a first line portion having a narrow width in a line shape, and a first auxiliary electrode portion extending in a wide width at both sides of the line portion. The second electrode may include a second line part having a narrow width in a line shape, and a second auxiliary electrode part extending in a wide width at one side of the line part and disposed to be close to the first auxiliary electrode part. High frequency plasma display panel. The method of claim 5, And the first and second auxiliary electrode parts are disposed in close proximity to the center of the discharge space.