KR100670298B1 - Plasma display panel - Google Patents

Abstract

The plasma display panel according to an exemplary embodiment of the present invention includes a back substrate, address electrodes disposed on an upper side of the rear substrate and extending in one direction, a lower dielectric layer covering the address electrodes, and an upper side of the lower dielectric layer, and being discharged. Barrier ribs defining a cell, a front substrate disposed in parallel with the rear substrate, sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes, an upper dielectric layer covering the sustain electrode pairs; And a protective layer covering the upper dielectric layer, wherein an upper dielectric layer is etched between the sustain electrode pairs of the respective discharge cell sections to form a gap, and a phosphor layer is coated on the gap. The etching surface of the upper dielectric layer has a discharge space between the sustain electrode pairs in a wide discharge space. It is characterized by the inclination to occur.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a plasma display panel having a top plate of a conventional ridge structure.

FIG. 2 is a vertical exploded cross-sectional view of the plasma display panel of FIG. 1.

3 is an exploded perspective view of a plasma display panel having a top plate of a ridge structure according to a preferred embodiment of the present invention.

4 is a vertical exploded cross-sectional view of the plasma display panel of FIG. 3.

FIG. 5 is a partially enlarged cross-sectional view of the upper plate of the plasma display panel in FIG. 4.

6 is a vertical cross-sectional view illustrating sustain discharge of a plasma display panel having a top plate of a ridge structure according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: back substrate 111: address electrode

112: lower dielectric layer 113: partition wall

115, 116: phosphor layer 120: front substrate

121a, 121b: sustain electrode 123: upper dielectric layer

123s: etching surface 124: protective layer

130: gap 132: groove

The present invention relates to a plasma display panel having a ridge structure. More particularly, the position of the etch surface and the sustain electrode of the dielectric layer to be etched and removed in forming the ridge structure to form the phosphor on the upper plate of the ridge structure is specified. The present invention relates to a plasma display panel improved so that sustain discharge can occur in a wider discharge space.

Plasma display panels (PDPs), which form images using electrical discharges, have excellent display performance, such as brightness and viewing angle, and their use is increasing day by day. In the plasma display panel, a discharge occurs in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and phosphors are excited by the radiation of ultraviolet rays accompanying the gas discharge process to emit visible light.

1 and 2 illustrate an example of a conventional plasma display panel having a ridge structure. In FIG. 2, only the front substrate is rotated by 90 ° to more clearly show the internal structure of the plasma display panel.

1 and 2 together, the conventional ridge structure plasma display panel includes a rear substrate 10 and a front substrate 20 facing each other.

A plurality of address electrodes 11 are arranged in a stripe shape on the top surface of the back substrate 10, and the address electrodes 11 are buried by the lower dielectric layer 12. In addition, a plurality of partitions 13 are formed on the upper surface of the lower dielectric layer 12 at predetermined intervals to prevent electrical and optical interference between the discharge cells. On the inner surface of the discharge cells partitioned by the partitions 13, phosphor layers 15 of red (R), green (G), and blue (B) are respectively coated with a predetermined thickness, and Ne, Xe or a discharge gas mixed with these is injected.

The front substrate 20 is a transparent substrate through which visible light can be transmitted and is mainly made of glass, and is coupled to the rear substrate 10 provided with the partition wall 13. On the bottom surface of the front substrate 20, stripe-shaped sustaining electrodes 21a and 21b orthogonal to the address electrodes 11 are formed in pairs. The sustain electrodes 21a and 21b are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. In order to reduce the line resistance of the sustain electrodes 21a and 21b, bus electrodes 22a and 22b made of metal are formed on the bottom of each of the sustain electrodes 21a and 21b. The width is made narrower. The sustain electrodes 21a and 21b and the bus electrodes 22a and 22b are embedded by a transparent upper dielectric layer 23, and a protective layer 24 is formed on the bottom of the upper dielectric layer 23.

In this structure, a dielectric is formed in the ridge type in the upper plate structure composed of the sustain electrodes, the upper dielectric layer, and the protective layer around the front substrate. That is, a part of the upper dielectric layer in the space between the pair of sustain electrodes 21a and 21b is etched away in the discharge cell 34 to form a gap 30 between the sustain electrodes in one discharge cell. In the gap, the lower surface of the front substrate is exposed toward the discharge cells.

However, in the conventional plasma display panel having a ridge structure, the sustain discharge between the sustain electrodes 21a and 21b tends to occur only in the etched gap 30 rather than the discharge cell 34 having a large discharge space. That is, since the etched surface of the etched upper dielectric layer 23 is formed perpendicular to the front substrate 20 and the sustain electrodes 21a and 21b are disposed in direct contact with the lower side of the front substrate, the etched surface is disposed between the etched surfaces. In the gap 30, the direction of the electric field of the sustain discharge is generated toward the front substrate side rather than toward the discharge cell having a wide discharge space, resulting in a narrow discharge space in which the sustain discharge occurs, resulting in poor discharge efficiency.

The present invention solves the above problems, by adjusting the positional relationship between the etching surface of the upper dielectric layer and the sustain electrode in the plasma display panel of the ridge structure plasma can be controlled so that the sustain discharge can occur to a large discharge space It is an object to provide a display panel.

In order to achieve the above object, the plasma display panel according to an embodiment of the present invention,

Back substrate;

Address electrodes disposed on the rear substrate and extending in one direction;

A lower dielectric layer covering the address electrodes;

Barrier ribs formed on an upper side of the lower dielectric layer to partition discharge cells;

A front substrate disposed in parallel with the rear substrate;

Sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes;

An upper dielectric layer covering the sustain electrode pairs; And

A protective layer covering the upper dielectric layer,

An upper dielectric layer is etched between the sustain electrode pairs of each discharge cell section to form a gap, and a phosphor layer is coated on the gap, and the etched surface of the etched upper dielectric layer has a discharge space between the sustain electrode pairs in a wide direction. It is characterized by the inclination so that the discharge of.

The phosphor layer is applied to the inside of the groove formed on the exposed surface of the lower surface of the front substrate in the gap.

The etching surface of the upper dielectric layer is inclined so that the gap becomes larger toward the discharge cell.

The sustain electrode pairs may be spaced apart from the bottom surface of the front substrate.

The sustain electrode pair may be spaced apart from the front substrate and positioned close to the discharge cell in the upper dielectric layer.

A phosphor layer is further applied to the side surfaces of the barrier ribs and the upper surface of the lower dielectric layer.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view of a plasma display panel according to a first exemplary embodiment of the present invention, and FIG. 4 is an exploded cross-sectional view of the plasma display panel of FIG. 3. In FIG. 4, only the front substrate is rotated by 90 ° to more clearly show the internal structure of the plasma display panel.

3 and 4 together, a plasma display panel according to an exemplary embodiment of the present invention includes a back substrate 110, a plurality of address electrodes 111 formed on an upper surface of the back substrate 110, And a lower dielectric layer 112 formed to bury the address electrode 111 on an upper surface of the back substrate 110. In addition, a partition wall 113 is formed on the lower dielectric layer 112 to prevent electrical and optical interference between the discharge cells by dividing the discharge cells.

The front substrate 120 coupled to the rear substrate 110 to form a discharge space above the partition 113 and formed on the bottom surface of the front substrate 120 and angled to intersect the address electrode 111. The sustain electrodes 121a and 121b having a predetermined shape are formed in pairs. Therefore, two sustain electrodes are disposed in pair to extend through the discharge cells.

The sustain electrodes 121a and 121b are buried by the transparent upper dielectric layer 123. Therefore, the sustain electrodes 121a and 121b have a structure not directly exposed to the discharge space.

Unlike the prior art described above, the sustain electrodes 121a and 121b are spaced apart from each other by a predetermined interval on the lower surface of the front substrate 120. In order to ensure that the sustain electrodes 121a and 121b are embedded in the upper dielectric layer 123 in this structure, the sustain electrodes 121a and 121b are not directly formed on the front substrate when the top plate including the front substrate is manufactured. After forming the upper dielectric layer primarily to a predetermined thickness, the sustain electrodes 121a and 121b are embedded in the upper dielectric layer by arranging the sustain electrodes thereon and then overlapping the upper dielectric layer of the same material thereon. .

Meanwhile, a portion of the upper dielectric layer 123 is etched and removed to include the front substrate 120, and the upper plate including the sustain electrodes 121a and 121b and the upper dielectric layer has a ridge structure. That is, since a portion of the upper dielectric layer 123 is etched away and removed, a gap 130 is formed at the portion where the upper dielectric layer 123 is removed to expose the lower surface of the front substrate 120.

Here, the etched surface 123s of the etched upper dielectric layer 123 is inclined to cause sustain discharge between sustain electrodes in a wide direction of discharge space. That is, the etching surface 123s of the upper dielectric layer 123 is inclined so that the gap 130 becomes larger toward the discharge cell 134. Referring to FIG. 4, the gap has a structure in which a width thereof becomes wider toward the bottom, like a skirt shape.

The phosphor layer 115 is formed on the lower surface of the front substrate 120 in the gap 130. More specifically, the recess 132 is concave in the surface where the lower surface of the front substrate 120 is exposed in the gap 130. Is formed, and a phosphor layer is formed in the groove 132.

Although only discharge cells corresponding to one discharge subpixel are illustrated in FIG. 4, in reality, discharge cells having the same shape are continuously formed. That is, a gap 130 is formed in each of the discharge subpixels, and the gap 130 is formed so that the portions of the lower surface of the front substrate 120 where the upper dielectric layer 123 is removed are red, blue, and green. The phosphor layer 115 is applied. In particular, the concave groove 132 is formed on the lower surface of the front substrate 120 exposed to the gap 130 as a separate section in which the phosphor layer 115 is applied, but preferably has a rectangular groove shape. It is not.

The groove 132 preferably has a length smaller than the horizontal and vertical lengths of the discharge cells so that the grooves are positioned within the sections of the discharge cells without crossing the sections of the discharge cells. In addition, since the phosphor layer 115 is coated inside the groove 132, the groove should be formed to a depth enough to apply the phosphor layer to a predetermined thickness. In addition, when the phosphor layer is applied to both the bottom surface and the side surface of the groove, it is preferable that the depth of the groove is set so that the phosphor layer applied to the side surface of the groove can also form a predetermined height. Further, it is preferable that the phosphor layer 115 is integrally formed on the side surface of the groove as well as the surface parallel to the front substrate in the groove 132.

In addition, the phosphor layer 116 is also applied to the side surface of the partition wall 113 and the upper surface of the lower dielectric layer 112 that partition the discharge cells corresponding to the sub discharge pixels, and the phosphor layer 115 applied inside the groove 132. The phosphor layer 116 applied to the upper surface of the lower dielectric layer 112 is preferably a phosphor layer of the same component.

Meanwhile, the upper dielectric layer 123 is covered by the protective layer 124. In the gap 130 in which the upper dielectric layer 123 is etched and removed, some surfaces of the upper dielectric layer 123 may be exposed to expose the upper dielectric layer ( The protective layer 124 is also formed on the surface exposed in the gap, that is, the surface of the upper dielectric layer etched away. The protective layer 124 prevents damage to the upper dielectric layer 123 due to the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons. The protective layer 124 is generally made of magnesium oxide (MgO).

Surrounded by the partition wall 113 to reach the gap 130 is all the discharge space, the discharge gas made of Xe, Ne or a mixture thereof is injected into the discharge space.

Some phosphor layers 115 are formed by being applied in the grooves 132 formed in the respective discharge subpixels, which are discharge cells, and some phosphor layers 116 are formed on the upper surface of the lower dielectric layer 112. The phosphor layers 115 and 116 have a component that receives ultraviolet rays and generates visible light. The phosphor layer formed on the red light emitting subpixel includes phosphors such as Y (V, P) O4: Eu, and the green light emitting subpixel. The phosphor layer formed on includes a phosphor such as Zn 2 SiO 4: Mn, YBO 3: Tb, and the phosphor layer formed on the blue light emitting subpixel preferably includes a phosphor such as BAM: Eu.

FIG. 5 is a partially enlarged view illustrating the positional relationship between the etching surface 123s of the upper dielectric layer 123 and the sustain electrode 121a in the upper panel structure of the plasma display panel illustrated in FIG. 4. In FIG. 5, only a portion of the sustain electrodes of FIG. 4 that corresponds to the sustain electrode 121a on the left side is enlarged.

As mentioned above, the etched surface 123s of the etched upper dielectric layer 123 is inclined so that discharge between sustain electrodes occurs in a wide direction of discharge space, so that the etch of the upper dielectric layer 123 gradually goes downward. As a result, the removed portion becomes larger, and thus, the etching surface 123s of the upper dielectric layer 123 is inclined so that the gap 139 becomes larger toward the downward direction in which the discharge cell is performed.

Accordingly, the distance toward the gap 130 of the sustain electrode 121a which is spaced apart from the front substrate 120 at a predetermined interval may cause the phosphor layer 115 coated on the groove 132 formed on the front substrate 120 to be separated. It can be distinguished by the distance (b) facing the distance (a) toward the phosphor layer 116 formed on the upper surface of the lower dielectric layer (112). In other words, the distance a is the shortest distance closest to the etching surface 123s from the sustain electrode 121a, and the distance b is the distance of the sections facing upward except for the sections.

Here, the distance a corresponding to the shortest path between the etching surface and the sustain electrode is inclined downward. In general, the discharge between the sustain electrodes occurs on the surface of the upper dielectric layer 123. In the present invention, a gap 130 is formed in the upper dielectric layer 123 so that the etching surface 123s is inclined in the upper dielectric layer 123. The electric field of the sustain discharge between the sustain electrodes 121a and 121b is formed perpendicular to the etching surface 123s. Therefore, when the etching surface 123s is formed to be inclined toward the discharge cell 134, the direction of the electric field of the sustain discharge is oriented toward the discharge cell 134 having a large discharge space without facing the gap 130. This results in a structure in which the direction of the electric field of the sustain discharge is also directed to the discharge cells below.

In the plasma display panel according to the preferred embodiment of the present invention having the above structure, the address discharge is applied by applying an address voltage between the address electrode 111 and the Y electrode which is one of the sustain electrodes 121a and 121b. This occurs, and as a result of this address discharge, a discharge cell in which sustain discharge is to be selected from among a plurality of discharge cells is selected.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the X electrode and the other electrode of the sustain electrode pair of the selected discharge cell, sustain discharge occurs between the X electrode and the Y electrode. Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 115 applied to the inside of the groove 132 formed in the gap 130 of the discharge cell. The energy level of the excited phosphor layer 115 is lowered so that visible light is emitted. Then, the visible light emitted by this process constitutes an image.

In this process, as shown in FIG. 6, since the etching surface 123s of the upper dielectric layer 123 is inclined toward the discharge cell 134, the electric field of the sustain discharge curves toward the gap 130 where the discharge space is narrow. Instead, the discharge space is curved toward the discharge cell 134 side (the direction toward the lower dielectric layer) where the discharge space is sufficiently large, and discharge occurs.

Therefore, in the plasma display panel according to the present invention, the formation direction of the electric field can be oriented downward in order to fully utilize the discharge space despite the top structure of the ridge structure.

As a method of orienting an electric field toward a discharge cell 134 during a sustain discharge, the plasma display panel of the present invention has a method of changing a position of a pair of sustain electrodes and a method of adjusting an inclination angle of an etched surface of an etched dielectric layer. Is starting. In addition, various methods for controlling the shape direction of the electric field during the wide discharge to the wider discharge space for efficient utilization of the discharge space in the plasma display panel are within the scope of the present invention.

The plasma display panel having the above structure as a preferred embodiment according to the present invention has the following effects.

First, when the sustain discharge is generated by forming a gap between the sustain electrodes, the discharge surface is oriented to the discharge space of the dielectric layer forming the gap so that the sustain discharge can occur in a wider space, thereby achieving a discharge efficiency. Has the effect of improving.

Second, since the phosphor layer applied to the groove formed in the gap is excited by forming a gap between the sustain electrodes, the luminance is increased as compared with the case where the phosphor layer is applied only to the lower plate.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

Back substrate; Address electrodes disposed on the rear substrate and extending in one direction; A lower dielectric layer covering the address electrodes; Barrier ribs formed on an upper side of the lower dielectric layer to partition discharge cells; A front substrate disposed in parallel with the rear substrate; Sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes; An upper dielectric layer covering the sustain electrode pairs; And A plasma display panel having a protective layer covering the upper dielectric layer, An upper dielectric layer is etched to form a gap between the sustain electrode pairs of each discharge cell section, and a groove for forming a phosphor layer is further formed on a surface of which the bottom surface of the front substrate is exposed, and a bottom of the groove is formed. Phosphor layers are coated on surfaces and sides, and the sustain electrode pairs are spaced apart from the bottom surface of the front substrate, and the etched surfaces of the etched upper dielectric layers are discharged between the sustain electrode pairs in a direction in which a discharge space is wide. Plasma display panel, characterized in that inclined. delete The method of claim 1, And the etching surface of the upper dielectric layer is inclined such that the gap becomes larger toward the discharge cell. delete The method of claim 3, wherein And the sustain electrode pair is spaced apart from the front substrate and positioned close to the discharge cell in the upper dielectric layer. The method of claim 5, And a phosphor layer is further applied to the side surfaces of the barrier ribs and the upper dielectric layer.

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