KR20060113141A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance light emitting efficiency and driving efficiency by improving an electrode structure. A plasma display panel includes a pair of bus electrodes(44,46) and a plurality of address electrodes(52). The bus electrodes are formed on an upper part of a discharge space which is defined by a barrier rib. The bus electrodes are separated from each other in order to secure a positive column region. The address electrodes are formed on a lower part of the discharge space in order to cross the bus electrodes. Each of the bus electrodes includes at least two or more bus lines, connective parts for connecting the bus lines with each other, and one or more projections formed on the bus lines.

Description

Plasma Display Panel

1 is a view showing a conventional three-electrode AC surface discharge type plasma display panel.

FIG. 2A is a diagram illustrating the light emitting regions in the sustain discharge; FIG.

FIG. 2B is a diagram illustrating a voltage distribution according to the light emitting area of FIG. 2A. FIG.

3 is a plan view of a unit discharge cell of the conventional plasma display panel shown in FIG.

4 is a perspective view showing a plasma display panel according to the present invention.

5 is a vertical sectional view of the plasma display panel shown in FIG.

FIG. 6 is a schematic plan view of the plasma display panel shown in FIG. 4; FIG.

Figure 7 is a view showing the various shapes of the protrusions according to the present invention.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved electrode structure.

Plasma Display Panels emit images containing characters or graphics by emitting phosphors by ultraviolet rays of 147 nm and 173 nm generated when discharge of inert mixed gases such as He + Xe, Ne + Xe and He + Ne + Xe. Will be displayed. The plasma display panel is not only thin and large in size, but also greatly improved in image quality due to recent technology development. In particular, the three-electrode AC surface discharge type plasma display panel has advantages of low voltage driving and long life because the wall charges are accumulated on the surface during discharge due to the upper and lower dielectrics and the protective film, and the electrodes are protected from sputtering caused by the discharge.

1 is a view showing a conventional three-electrode AC surface discharge type plasma display panel.

As shown in FIG. 1, a discharge cell of a conventional three-electrode AC surface discharge type plasma display panel 100 includes a scan electrode 11 and a sustain electrode 12 formed on an upper substrate 10, and a lower substrate 20. ) Is formed on the address electrode 22.

Each of the scan electrode 11 and the sustain electrode 12 has a line width smaller than the line widths of the transparent electrodes 11a and 12a and the transparent electrodes 11a and 12a and is formed on one edge region of the transparent electrode 11b. , 12b). The transparent electrodes 11a and 12a are usually indium tin jade.

It is formed on the upper substrate 10 as a side (Indium-Tin-Oxide: hereinafter referred to as 'ITO'). The metal bus electrodes 11b and 12b are usually formed of metal such as chromium (Cr) and formed on the transparent electrodes 11a and 12a to reduce the voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

The upper dielectric layer 13a and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 13a.

The protective layer 14 prevents damage to the upper dielectric layer 13a due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 14, magnesium oxide (MgO) is usually used.

The lower dielectric layer 13b and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed, and the phosphor layer 23 is coated on the lower dielectric layer 13b and the partition wall 21.

The address electrode 22 is formed in the direction crossing the scan electrode 11 and the sustain electrode 12.

The partition wall 21 is formed in parallel with the address electrode 22 to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 223 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe, and He + Ne + Xe for discharging is injected into the discharge space of the discharge cell provided between the upper and lower substrates 10 and 20 and the partition wall 21.

FIG. 2A is a diagram illustrating light emitting regions in a sustain discharge, and FIG. 2B is a diagram illustrating voltage distributions according to the light emitting regions of FIG. 2A.

As shown in FIGS. 2A and 2B, regions in which light emission phenomena occur in the discharge space inside the plasma display panel cell are shown separately when sustain discharge is performed.

As shown in FIG. 2A, when a predetermined voltage is applied between the cathode (for example, the sustain electrode) and the anode (for example, the scan electrode), discharge occurs due to the emission of electrons between both electrodes. At this time, the primary electrons emitted from the cathode are accelerated by an electric field applied between both electrodes to collide with the neutral particles to generate new electrons (ie, secondary electrons). The secondary electrons are strongly accelerated in the portion A of FIG. 2B where the magnitude of the electric field is relatively large as the voltage change is large. These secondary electrons continue to obtain energy as they ionize and reach region B in FIG. 2B. In the region B of FIG. 2B, the secondary electrons no longer get energy and transfer energy to the neutral particles by collision. In this process, the excited particles fall to the ground to generate visible and vacuum ultraviolet rays. It is called a negative glow region 2 as shown in FIG. The electrons passing through the sub-low glow region 2 are so weak in energy that the overall plasma state is uniform. This region is called a positive column region 4 as shown in FIG. 2A. In the positive light region 4, only electrons with high energy in the entire area excite gas, not energy due to an electric field, to emit light. In the positive light column region 4, ionization hardly occurs and a lot of light emission due to excitation occurs, and the energy is converted into light as a whole, resulting in good efficiency.

3 is a plan view of a unit discharge cell of the conventional plasma display panel shown in FIG.

As shown in FIG. 3, the conventional plasma display panel has a problem in that the distance D1 between the transparent electrodes is short, so that it does not fully utilize the positive column region.

An object of the present invention to solve this problem is to provide a plasma display panel that improves the light emitting efficiency and driving efficiency by improving the electrode structure.

Plasma display panel of the present invention for achieving the above object is formed on the upper part of the discharge space partitioned by the partition wall and a pair of bus electrodes and a pair of bus electrodes spaced at a predetermined distance to secure a positive light area; In the plasma display panel including an address electrode formed in the lower portion of the discharge space to cross, the bus electrode includes at least two bus lines and a connection portion connecting the bus lines, At least one protrusion is characterized in that formed.

The separation distance between the pair of bus electrodes is greater than the separation distance between the bus electrode and the address electrode.

The separation distance between the pair of bus electrodes may be 250 µm or more and 450 µm or less.

The width of the discharge gap formed between the bus electrodes is characterized by being at least 1 times and at most 4 times the width of the bus electrodes.

The thickness of the bus electrodes is 1 µm or more and 10 µm or less.

The protrusion is characterized in that it is formed toward the center of the discharge space.

The shape of the protrusion is characterized in that it comprises at least one of polygonal or curved.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

4 is a perspective view showing a plasma display panel according to the present invention, FIG. 5 is a vertical sectional view of the plasma display panel shown in FIG. 4, and FIG. 6 is a schematic plan view of the plasma display panel shown in FIG. 4.

As shown in FIGS. 4 to 6, the plasma display panel according to the present invention includes a pair of bus electrodes 44 and 46 formed on the upper substrate 45, that is, the scan electrode 44 and the sustain electrode 46. And an address electrode 52 formed on the lower substrate 42.

Each of the scan electrode 44 and the sustain electrode 46 is composed of only conductive bus electrodes 44 and 46 spaced apart by a predetermined distance in order to secure a wide range of light beams, and each of the bus electrodes 44 and 46 is at least two. At least one bus line 44a, 46a and connecting portions 44b, 46b for connecting the bus lines 44a, 46a, each of which has at least a bus line 44a, 46a closest to the center of the discharge space 400; One or more protrusions 44c and 46c are formed.

This will be described in more detail as follows.

In the plasma display panel according to the exemplary embodiment of the present invention, the distance between the scan electrode 44 and the sustain electrode 46 where the sustain discharge occurs is located farther than before, so that the sustain discharge has a long discharge path.

That is, unlike the related art, in the plasma display panel according to the exemplary embodiment of the present invention, the transparent electrode is removed from each of the scan electrode 44 and the sustain electrode 46, and only the conductive bus electrode is used to scan the electrode 44 and the sustain electrode ( 46 increases the separation distance between the scan electrode 44 and the sustain electrode 46, thereby increasing the discharge gap between the scan electrode 44 and the sustain electrode 46, thereby widening the positive light region. To use.

The separation distance B between the scan electrode 44 and the sustain electrode 46 is preferably set larger than the separation distance D between the scan electrode 44 or the sustain electrode 46 and the address electrode 52. .

Thus, by setting the separation distance B between the scan electrode 44 and the sustain electrode 46 larger than the separation distance D between the scan electrode 44 or the sustain electrode 46 and the address electrode 52, the scan is performed. The surface discharge region between the electrode 44 and the sustain electrode 46 is set to be larger than the scan electrode 44 or the counter discharge region between the sustain electrode 46 and the address electrode 52 and accordingly the scan electrode 44 and the sustain electrode It is to greatly improve the surface discharge efficiency between (46).

The separation distance between the scan electrode 44 and the sustain electrode 46 is preferably 250 µm or more and 450 µm or less.

As the distance between the electrodes increases in this way, the discharge path becomes longer, so that the positive light column region can be enlarged, and thus high discharge efficiency can be obtained.

In this case, when the discharge path between the scan electrode 44 and the sustain electrode 46 is long, the discharge voltage for causing the discharge between the two electrodes 44 and 46 is increased.

Therefore, the present invention is a means for reducing the discharge voltage between the scan electrode 44 and the sustain electrode 46 at least one protrusion 44c, 46c in the bus line (44a, 46a) closest to the center of the discharge space 400 To form.

The protrusions 44c and 46c may be formed toward the center of the discharge space 400.

The discharge voltage between the bus electrodes 44 and 46, that is, the scan electrode 44 and the sustain electrode 46 can be reduced by utilizing the effect of the electric field concentration caused by the protrusions 44c and 46c.

It is preferable that the width B of the discharge gap formed between the bus electrodes 44 and 46 be one or more and four times or less the width A = C of the bus electrode.

Thus, by adjusting the width B of the discharge gap to 1 or more times and 4 times or less the width A of the bus electrode, the discharge area is expanded to improve the efficiency of the sustain discharge.

The thickness of the bus electrodes 44 and 46 is preferably 1 µm or more and 10 µm or less.

It is preferable that the shape of the protrusions 44c and 46c include at least one of a polygon or a curved shape.

 Thus, the sustain discharge voltage can be lowered by concentrating the electric field by adjusting the thickness of the bus electrodes 44 and 46 or by adjusting the shapes of the protrusions 44c and 46c.

Meanwhile, the protrusion may be configured in various forms as shown in FIG. 7.

In addition, the bus electrodes 44 and 46 have a structure of at least two bus lines 44a and 46a in order to minimize a decrease in luminance due to the bus electrodes 44 and 46 positioned above the discharge space 400. It comprises a connecting portion (44b, 46b) for connecting the line. By setting the structures of the bus electrodes 44 and 46 in this manner, the reduction of the aperture ratio is prevented to ensure the luminance of the plasma display panel.

Meanwhile, an upper dielectric layer 50 and a passivation layer 48 are stacked on the upper substrate 45 on which the scan electrode 44 and the sustain electrode 46 are arranged side by side.

Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 50.

The passivation layer 48 prevents damage to the upper dielectric layer 50 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 48, magnesium oxide (MgO) is usually used.

The lower dielectric layer 54 and the partition wall 56 are formed on the lower substrate 42 on which the address electrode 52 is formed, and the phosphor layer 58 is coated on the lower dielectric layer 54 and the partition wall 56. The address electrode 52 is formed in the direction crossing the scan electrode 44 and the sustain electrode 46.

The partition wall 56 prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

The phosphor layer 58 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space 400 of the discharge cell provided between the upper and lower substrates 45 and 42 and the partition wall 56. .

Plasma display panel according to the present invention having such a structure as described above in detail, by actively utilizing the positive light column region to increase the luminous efficiency, while lowering the discharge start voltage to improve the driving efficiency.

In addition, the decrease in the aperture ratio is minimized to improve the brightness.

As described above, it will be understood by those skilled in the art that the above-described technical configuration may be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

As described in detail above, the present invention provides a plasma display panel which improves luminous efficiency and driving efficiency through an improved electrode structure.

Claims (7)

And a pair of bus electrodes spaced apart by a predetermined distance and an address electrode formed under the discharge space so as to intersect the pair of bus electrodes so as to be formed at an upper portion of the discharge space partitioned by the partition wall to secure a positive light beam region. In the plasma display panel, The bus electrode is At least two bus lines; A connection for connecting the bus line; At least one protrusion is formed in a bus line closest to a center of the discharge space. The method of claim 1, And a separation distance between the pair of bus electrodes is greater than a separation distance between the bus electrode and the address electrode. The method of claim 2, And a separation distance between the pair of bus electrodes is 250 μm or more and 450 μm or less. The method of claim 3, wherein And a width of the discharge gap formed between the bus electrodes is one to four times less than the width of the bus electrode. The method of claim 4, wherein And the bus electrode has a thickness of 1 µm or more and 10 µm or less. The method according to any one of claims 1 to 5, And the protrusion is formed toward the center of the discharge space. The method of claim 6, The protrusion may include at least one of a polygon or a curve.

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