KR100326227B1 - Plasma Display Panel Device for Radio Frequency - Google Patents

Abstract

In particular, the present invention relates to a high frequency plasma display device configured to reduce power consumption and improve brightness.

A high frequency plasma display device of the present invention includes a scan electrode formed on a substrate, an address electrode orthogonal to the scan electrode; A first dielectric layer patterning a predetermined portion between the two electrodes to insulate the scan electrode and the address electrode; And a second dielectric layer formed on the entire substrate so as to cover the scan electrode, the first dielectric layer, and the address electrode.

By such a configuration, the high frequency plasma display device of the present invention reduces power consumption and improves luminance.

Description

Plasma Display Device for Radio Frequency {Plasma Display Panel Device for Radio Frequency}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a high frequency plasma display device configured to reduce power consumption and improve brightness.

Recently, a liquid crystal display (hereinafter referred to as "LCD"), a field emission display (hereinafter referred to as "FED") and a plasma display panel (hereinafter referred to as "PDP") Flat display devices such as PDP have been actively developed, and among these, PDP is able to realize a large screen of 40 inches or more as well as ease of fabrication due to its simple structure, excellent brightness and luminous efficiency, memory function and a wide viewing angle of 160 ° or more. Has the advantage.

Referring to FIG. 1, an AC PDP according to the related art is provided with a lower substrate 14 on which an address electrode 2 is mounted, and a lower dielectric layer coated with a predetermined thickness on an upper portion of the lower substrate 14 to form wall charges. (18), a sustain electrode pair (4) formed transparently on the upper substrate (16) to drive the discharge, and a predetermined thickness on the upper substrate (16) and the sustain electrode pair (4). An upper dielectric layer 12 is applied to form wall charge. The conventional PDP structure will be described in detail. A stripe-shaped partition wall 8 is formed between the lower substrate 14 and the upper substrate 16 to divide each discharge cell. In addition, on the upper substrate 16, a pair of sustain electrodes 4, that is, a scan / address electrode and a sustain electrode are arranged side by side. In this case, a bus electrode 19 is provided below the sustain electrode pair 4. A protective layer 10 is applied on the upper dielectric layer 12 to protect the upper dielectric layer 12 from sputtering by plasma discharge. On the other hand, the address substrate 2 is disposed on the lower substrate 14 so as to be orthogonal to the sustain electrode pair 4. On top of the lower dielectric layer 18, a partition 8 is formed at a predetermined height (e.g., 150-180 mu m). Phosphor 6 coated on top of barrier 8 and lower dielectric layer 18 is excited by vacuum ultra-violet (UVU) to generate visible light. Meanwhile, a driving method of the PDP will be described. When a predetermined driving voltage Va is applied between the address electrode 6 and the sustain electrode pair 4, the discharge cell to be discharged is addressed inside the discharge cell. Subsequently, when a predetermined driving voltage Vs is applied between the sustain electrode pairs 4, plasma discharge is caused by electrons emitted from the sustain electrode pairs 4 of the addressed discharge cells. The vacuum ultraviolet rays generated in this process excite the phosphors of red (hereinafter referred to as 'R'), green (hereinafter referred to as 'G') and blue (hereinafter referred to as 'B'). The light of R, G, and B emitted from the phosphor passes through the protective layer 10, the upper dielectric layer 12, and the sustain electrode pair 4 toward the front of the upper substrate 16 to display characters or graphics. do. In this case, by adjusting the number of times of sustain discharge, stepwise brightness necessary for displaying an image, that is, gray scale, is realized. Accordingly, the number of sustain discharges is recognized as an important factor for determining the brightness and discharge efficiency of the PDP. In fact, in the AC type PDP, in order to perform sustain discharge, a spherical pulse of 10-100 Hz is periodically applied. In this case, the sustain discharge occurs only once at an extremely short instant per sustain pulse. That is, in AC PDP, the sustain discharge by the sustain pulse occurs only once at a very short time every pulse, and most of the other time is consumed as a preparation step for the formation of the wall charge and the next discharge, thereby reducing the discharge efficiency of the PDP. Will be.

In order to improve such a decrease in discharge efficiency, studies are being actively conducted to raise the sustain discharge frequency to a high frequency (for example, several MHz to several hundred MHz). Hereinafter, a hybrid type PDP that performs plasma discharge using a radio frequency (hereinafter, referred to as 'RF') signal will be described with reference to FIG. 2.

Referring to FIG. 2, the hybrid PDP includes an address electrode 22 formed on the lower substrate 14, a scan electrode 20 formed to be orthogonal to the address electrode 22, an address electrode 22, and a scan electrode. The first and second dielectric layers 26 and 28 and the second dielectric layer 28 to form wall charges and electrically isolate the address electrode 22 and the scan electrode 20. A partition 8 formed at an upper part to divide each discharge cell, a phosphor 6 applied to an inner wall of the partition 8 to generate a light beam, and a transparent upper part of the upper substrate 16 to form an RF signal And a third dielectric layer 30 formed on top of the RF electrode 24 to form wall charges and protecting the RF electrode 24. At this time, the arrangement of the electrodes, the lower substrate 14 is formed with a scan electrode 20 to be orthogonal to the address electrode 22, the upper substrate 16, the RF electrode in the same direction as the scan electrode 20 24 is formed. In this case, the scan electrode 20 and the RF electrode 24 are disposed to face each other, and the RF discharge is caused by the two electrodes 20 and 24. In addition, it is preferable that the hybrid PDP has a height higher than that of the AC PDP. On the other hand, the operation of the hybrid PDP will be described. When a driving voltage is applied between the scan electrode 20 and the address electrode 22, address discharge is performed to generate charged particles in the discharge cell to be selected in the discharge cell. Subsequently, when a driving voltage is applied between the address electrode 22 and the RF electrode 24, RF discharge is performed in the discharge cell selected by the address discharge. At this time, the charged particles are vibrated by the RF pulse applied to the RF electrode 24 to continuously ionize and excite the inside of the discharge cell, thereby causing continuous discharge during the discharge time. This has the same physical effect as positive column with high discharge efficiency in glow discharge. At this time, the RF pulse uses a rectangular pulse (or sine wave) of several MHz to several tens of MHz. 3, the partition 8 of the hybrid PDP has a lattice structure, and the address electrodes X1 to Xm and the scan electrodes Y1 to Yn are arranged perpendicular to each other. As described above, the hybrid PDP having the crossover shape has a high voltage applied to the dielectric layer, thereby increasing the driving voltage. This will be described with reference to FIG. 4. As shown in FIG. 4, there is shown a diagram for describing a voltage applied to the dielectric layer. At this time, the capacitance C accumulated in the dielectric layer is shown in Equation (1).

Where C is the capacitance, , Is the permittivity, A is the area, and d is the distance. In addition, when the capacitance formed by the scan electrode 20 and the discharge space is C1, the capacitance formed by the discharge space is C2, and the capacitance formed by the address electrode 22 and the discharge space is C3, the relationship between C1 and C3 is different. Equation 2 is shown.

In this case, it is assumed that the distance between the scan electrode 20 and the discharge space is 30 μm, the distance between the address electrode 22 and the discharge space is 70 μm and the distance from the inversion space is 20 μm. In addition, it is assumed that the area of the capacitor is constant. In this case, it is assumed that the dielectric constants of the first and second dielectric layers 26 and 28 are 10 and the dielectric constant of the discharge space is 1. As shown in Equation 2, 30 to 40% of the applied voltage to the scan electrode 20 and the address electrode 22 is applied to the dielectric layer. In this case, when the voltage applied to the discharge space and the dielectric layer is separated, C1 + C3: C2 is 0.1: 0.05. The voltage applied to the dielectric layer is shown in equation (3).

Here, V means applied voltage. In connection with Equation 3, when the voltage required to cause the actual discharge is 200V, a voltage of at least 290-330V must be applied between the scan electrode 22 and the address electrode 24. In other words, the driving voltage becomes high.

In addition, in the hybrid PDP, since the dielectric layers 26 and 28 have a thickness of 30 to 40 µm or more, the screen printing process is repeatedly performed several times. In this case, not only the interface between the screen printed dielectric layers 26 and 28 is uniform, but also the thickness of the dielectric layer is difficult to be uniformly formed. As a result, the conventional hybrid PDP (hereinafter referred to as "RF PDP") has led to a problem that the uniformity of the discharge voltage is lowered.

Accordingly, an object of the present invention is to provide a high frequency plasma display device configured to reduce power consumption and improve luminance.

1 is a perspective view showing the structure of a conventional AC PDP.

2 is a cross-sectional view showing the structure of a conventional hybrid PDP.

3 is a plan view of the upper portion of FIG.

4 is a cross-sectional view illustrating the crossover structure of FIG. 2.

5 is a sectional view showing the structure of a PDP according to the present invention;

6 is a view for explaining the manufacturing method of FIG.

<Description of Symbols for Main Parts of Drawings>

2,22,42: address electrode 4: sustain electrode pair

6,58 phosphor 8,62 partition wall

10,50: protective layer 12,18: dielectric layer

14,52: Lower substrate 16,56: Upper substrate

20,44: scan electrode 24,54: RF electrode 26,46: first dielectric layer 28,48: second dielectric layer 30,60: third dielectric layer

In order to achieve the above object, a high frequency plasma display device of the present invention includes a scan electrode formed on a substrate, an address electrode orthogonal to the scan electrode, and a predetermined portion between the two electrodes for insulation between the scan electrode and the address electrode. And a patterned first dielectric layer, and a second dielectric layer formed on the entire substrate so as to cover the scan electrode, the first dielectric layer, and the address electrode. It is characterized in that it is patterned to have a line shape in the same direction. In addition, the first dielectric layer is characterized in that it is formed thicker than the second dielectric layer.

Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

A preferred embodiment of the present invention will be described with reference to FIGS. 5 and 6.

Referring to FIG. 5, the RF PDP of the present invention includes an address electrode 42 formed on the lower substrate 52, a scan electrode 44 formed to be orthogonal to the address electrode 42, and an address electrode 42. First and second dielectric layers 46 and 48 which are patterned in a predetermined shape between the and the scan electrodes 44 to form wall charges, and electrically isolate the address electrodes 42 and the scan electrodes 44. A protective film 50 formed on the second dielectric layer 48 to protect the scanning electrode 44 from sputtering, a partition wall 62 formed on the protective film 50 to divide each discharge cell, and a partition wall. Phosphor 58 coated on the inner wall of 62 to generate a light beam, RF electrode 54 transparently formed on the upper substrate 56 to apply an RF signal, and upper portion of RF electrode 54. And a third dielectric 60 formed to form wall charges and protecting the RF electrode 54. Since the structure of the top plate of the RF PDP is the same as in the prior art, a detailed description thereof will be omitted. On the other hand, the first and second dielectric layers 46 and 48 are patterned in a line shape, and the first dielectric layer 46 which electrically isolates the address electrode 42 and the scan electrode 44 from the first dielectric layer 46 and the second to form wall charges. And a dielectric layer 48. In detail, the first dielectric layer 46 is formed by patterning the first dielectric layer 46 in a line shape between the address electrode 42 and the scan electrode 44 to apply the first dielectric layer 46 to the upper portion of the address electrode 42. It will reduce the thickness of. At this time, the thickness of the first dielectric layer 46 can be adjusted according to the designer's intention, thereby reducing the leakage current. In addition, a second dielectric layer 48 that generates wall charges is formed on the address electrode 42, the first dielectric layer 46, and the scan electrode 44. In this case, when the capacitance formed by the scan electrode 44 and the discharge space is C1, the capacitance formed by the discharge space is C2, and the capacitance formed by the address electrode 42 and the discharge space is C3. Is shown in equation (4).

In this case, it is assumed that the distance between the scan electrode 44 and the discharge space is 20 μm, the distance between the address electrode 42 and the discharge space is 60 μm, and the distance from the discharge space is 20 μm. In addition, it is assumed that the area of the capacitor is constant. In this case, the distance of the discharge space may be adjusted according to the designer's intention by patterning the first dielectric layer 46. As shown in Equation 4, 90% or more of the voltage applied to the discharge space is applied. In this case, when the voltage applied to the discharge space and the dielectric layer is separated, C1 + C3: C2, so 0.25: 0.05. The voltage applied to the dielectric layer is shown in equation (5).

Here, V means applied voltage. In connection with Equation 5, when the voltage required to cause the actual discharge is 200V, a voltage of at least 2220V may be applied between the scan electrode 22 and the address electrode 24. That is, the driving voltage can be lowered. On the other hand, the first and second dielectric layers 46 and 48 are applied to the substrate once or twice, thereby forming a dielectric layer having a similar thickness in each cell. As a result, changes in the discharge voltage are reduced to maintain uniformity of discharge.

Referring to FIG. 6, there is shown a diagram for explaining a method of forming a dielectric layer of an RF PDP of the present invention.

The address electrode 42 is formed on the substrate 52. (First Step) An address electrode 42 is formed on the substrate 52 as shown in Fig. 6A.

A first dielectric layer 46 patterned in a line shape is formed on the address electrode 42. (Second Step) At this time, the first dielectric layer 46 is formed by placing a line-type screen printing mask (not shown) on the address electrode 42 and printing a paste. A line patterned first dielectric layer 46 is formed as shown in b). In this case, the first dielectric layer 46 patterned in a line shape having a predetermined thickness between the address electrode 42 and the scan electrode 44 electrically isolates the address electrode 42 and the scan electrode 44 from leakage. To prevent current. In addition, since the first dielectric layer 46 is formed only on a part of the address electrode 42, the discharge voltage and the uniformity are improved.

The scan electrode 44 is formed on the first dielectric layer 46. (Third Step) As shown in FIG. 6C, the scan electrode 44 is formed on the first dielectric layer 46 in a direction orthogonal to the address electrode 42.

The second dielectric layer 48 and the passivation layer 50 are sequentially formed. (Fourth Step) As shown in FIG. 6D, a second dielectric layer 48 is formed on the address electrode 42, the first dielectric layer 46, and the scan electrode 44. Subsequently, as shown in FIG. 6E, the passivation layer 50 is formed on the second dielectric layer 48.

As described above, the RF PDP of the present invention lowers the discharge voltage by patterning the first dielectric layer in a line shape, thereby reducing the power consumption. In addition, the luminance is improved as the uniformity of the discharge is improved.

As described above, the high frequency plasma display device of the present invention has the advantage of reducing power consumption and improving luminance.

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 (3)

A scan electrode formed on the substrate, An address electrode orthogonal to the scan electrode; A first dielectric layer patterning a predetermined portion between the two electrodes for insulation between the scan electrode and the address electrode; And a second dielectric layer formed on the entire substrate so as to cover the scan electrode, the first dielectric layer, and the address electrode. The method of claim 1, And the first dielectric layer is patterned to have a line shape on the address electrode in the same direction as the scan electrode. The method of claim 1, And the first dielectric layer is formed thicker than the second dielectric layer.