KR100696546B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to correct easily a color temperature value and an address discharge voltage margin by forming differently projections of electrodes arranged within a barrier rib according to discharge cells. A front substrate(120) and a rear substrate(130) are disposed opposite to each other. A barrier rib is arranged between the front and the rear substrate in order to define discharge cells(C). A first and a second electrode(122,123) are arranged within the discharge cell. A front dielectric layer(127) is formed to bury the first and the second electrode. A phosphor layer(139) is disposed within each of the discharge cells. The discharge cells are filled with discharge gas. The front substrate includes a base part and a plurality of projections(120b) projected from the base part to a first direction. The first and the second electrode are arranged on lateral surfaces of the projections.

Description

Plasma display panel {Plasma display panel}

1 is a perspective view showing a conventional conventional plasma display panel.

2 is a perspective view illustrating a plasma display panel according to an exemplary embodiment of the present invention.

3 is a plan view taken along line III-III of FIG. 2.

4 is a perspective view illustrating a relationship between a first electrode, a second electrode, and an address electrode of FIG. 2.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 2.

6 is an enlarged cross-sectional view of part E of FIG. 5.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 120: front substrate

120a: base 120b: protrusion

122: first electrode 123: second electrode

127: front dielectric layer 129: protective film

130: rear substrate 130f: front substrate

133: address electrode 136: back dielectric layer

139: phosphor layer C: discharge cell

H1: thickness before and after protrusion H2: thickness before and after base

A: Spacing between front dielectric layers B: Width across bulkhead

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel that expresses a character or an image by using gas discharge. More particularly, the present invention relates to a plasma display panel capable of low voltage driving, an enlarged surface of a discharge, and an improved aperture ratio. It is about.

Recently, a device employing a plasma display panel as a flat panel display device has a large screen, and has excellent characteristics of high definition, ultra-thin, light weight, and wide viewing angle. It is attracting attention as a large flat panel display device.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to an applied discharge voltage, and classified into a counter discharge type and a surface discharge type according to a discharge structure.

In the DC plasma display panel, all electrodes are exposed to a discharge space, and charges are directly transferred between the corresponding electrodes. In the AC plasma display panel, at least one electrode is surrounded by a dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the DC plasma display panel, since the charge is directly transferred between the corresponding electrodes, there is a problem in that the electrode is severely damaged. In recent years, an AC plasma display panel having an AC type, in particular, a three-electrode surface discharge structure is present. This has been generally employed.

The conventional surface discharge plasma display panel 10 including the AC three-electrode surface discharge plasma display panel includes a front substrate 20 and a rear substrate 30 as shown in FIG. 1.

The back substrate 30 includes an address electrode 33 for generating an address discharge, a back dielectric layer 35 embedding the address electrode, a partition wall 37 partitioning discharge cells, and both sides of the partition wall and the partition wall. The phosphor layer 39 applied to the back substrate which is not formed is formed.

The front substrate disposed to face the rear substrate so as to be spaced apart from each other, the front and rear dielectric layers 25 having the X and Y electrodes 22 and 23 generating a sustain discharge, and the X and Y electrodes 22 and 23 embedded therein, and The protective film 29 is provided.

However, in the conventional plasma display panel, first, the transparent X electrode 22a and one side of the transparent X electrode are disposed on the front substrate 20 through which visible light emitted from the phosphor layer 39 in the discharge space passes. The Y electrode 23 normally provided with the X electrode 22 normally equipped with the bus X electrode 22b, and the bus Y electrode 23b arrange | positioned at one side of the transparent Y electrode 23a and the said transparent Y electrode 23a. ), A front dielectric layer 25, and a protective film 29 formed sequentially on the X and Y electrodes. These factors have a serious problem that the visible light transmittance of about 60%.

Second, in the conventional surface discharge plasma display panel 10, the electrode which causes the discharge is formed on the upper surface of the discharge space, that is, the inner surface of the front substrate 20 through which visible light passes, so that the discharge occurs on the inner surface and diffuses. Therefore, there is an inherent problem of low luminous efficiency.

Third, the conventional surface discharge plasma display panel 10 has a problem that, when used for a long time, the charged particles of the discharge gas causes ion sputtering on the phosphor by an electric field, causing permanent afterimage.

SUMMARY OF THE INVENTION The present invention is to solve the above problems, to provide a plasma display panel that can significantly expand the opening area and transmittance as compared to the conventional plasma display panel, and can significantly expand the discharge area by greatly expanding the discharge surface. .

Another object of the present invention is to concentrate the plasma by the discharge to a predetermined portion of the discharge space, for example, the center portion, which can efficiently use the space charge of the plasma, enable low voltage driving, and significantly improve the luminous efficiency. It is to provide a display panel.

Still another object of the present invention is to provide a plasma display panel having a structure in which ions do not directly collide vertically during sustain discharge, thereby minimizing the loss of phosphor due to discharge plus.

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

A front substrate and a rear substrate disposed to face each other;

A partition wall disposed between the front substrate and the rear substrate and partitioning the discharge cells together with the front substrate and the rear substrate;

First and second electrodes disposed in the discharge cell; A front dielectric layer filling the first electrodes and the second electrodes;

A phosphor layer disposed in the discharge cell; And

And a discharge gas in the discharge cell,

The front substrate includes a base portion and a plurality of protrusions protruding and extending between discharge cells adjacent to each other in a first direction from the base portion.

The first electrode and the second electrode, respectively, characterized in that disposed on the side of the projection facing each other for each discharge cell.

및

을 만족하는 것이 바람직하다. In this case, when the distance between the front dielectric layers formed on both sides of the partition wall is A, and the width of the front surface of the partition wall is B,

And

It is desirable to satisfy.

In addition, the width of the upper surface of the partition wall is preferably equal to the distance between the sides of the front dielectric layer disposed on both sides of the front substrate protrusion located directly above it.

Meanwhile, each of the discharge cells may further include address electrodes extending in a second direction, the direction in which the first electrode and the second electrode extend in a direction intersecting on one plane. In this case, the address electrodes may be disposed between the rear substrate and the phosphor layer, and a back dielectric layer covering the address electrodes may be disposed between the phosphor layer and the address electrodes.

At least the front dielectric layer is preferably covered by a protective film.

Next, a plasma display panel according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

2 and 3, the plasma display panel 100 according to the embodiment of the present invention includes a front substrate 120, a rear substrate 130, a partition 137, a first electrode 122, and a second electrode. An electrode 123, a partition 137, a phosphor layer 139, and a discharge gas are provided.

The front substrate 120 on which the visible light passes and the image is projected is disposed in parallel with the rear substrate 130. A partition wall 137 is formed between the front substrate 120 and the rear substrate 130. The partition wall 137 is disposed in the non-discharge portion as will be described later to partition the discharge cell (C). The discharge cell C is a space for generating a discharge and generating light to implement an image.

In this case, the front substrate 120 includes a base 120a and a protrusion 120b. The protruding portion 120b protrudes from the base portion toward the rear substrate 130 and protrudes between the discharge cells C adjacent to each other in one direction (the x direction in FIG. 2). The first electrode 122 is formed on one side of the protrusion 120b, and the second electrode 123 is formed on the other side of the protrusion. That is, as shown in FIG. 3, in one discharge cell C, first protrusions 120b_1 protruding in the first direction from the base 120a of the front substrate on both sides of the discharge cell C on both sides thereof. ) And a second protrusion 120b_2, a first electrode 122 is disposed on one side of the first protrusion 120b_1, and a second electrode 123 on the other side of the second protrusion 120b_2. Is placed.

2, the front substrate 120 and the back substrate 130 are generally formed of glass, and the front substrate 120 is preferably formed of a material having high light transmittance.

The first electrodes 122 and the second electrodes 123 are covered by the front dielectric layer 127. The front dielectric layer 127 must have an electric field formed by the potential applied to the first electrodes 122 and the second electrodes 123 to be transferred into the discharge cell by the molecular arrangement of the barrier material. do. In this case, the front dielectric layer 127 may be formed of a glass component including elements such as Pb, B, Si, Al, and O, and the like, where necessary, ZrO ₂ , TiO ₂ , and Al _2. It may be formed of a dielectric including a filler such as O ₃ and pigments such as Cr, Cu, Co, Fe, TiO ₂ and the like, and the front dielectric layer 127 may be charged particles by a potential applied to the discharge electrode. Induces wall charges to participate in the discharge, and serves to protect the electrodes.

A passivation layer 129 is preferably formed on the side surface of the front dielectric layer 127. The passivation layer 129 protects the first electrode 122 and the second electrode 123 and the front dielectric layer 127 covering the first electrode 122 and the second electrode 123 and discharges secondary electrons so that the discharge may occur easily. .

The partition wall 137 secures a space in which the phosphor layer 139 can be applied, and also has a vacuum state (for example, 0.5 atm) of discharge gas charged inside the front substrate 120 and the rear substrate 130. ) To support the pressure generated, to secure the space of the discharge cell (C), and to prevent cross talk of the charged particles between the discharge cells. In addition, the barrier rib may include a reflective material so that visible light generated from the discharge cell may be reflected forward.

In FIGS. 2 and 3, the partition wall 137 partitions the discharge cells in a matrix form, but is not limited thereto. The partition wall 137 may be partitioned into other shapes such as a honeycomb form.

On the front surface 130f of the back substrate 130, address electrodes 133 extending in a direction crossing the first and second electrodes 122 and 123 (y-axis directions in FIGS. 2 and 3) are formed. The address electrodes 133 may be covered by the back dielectric layer 136.

In this case, as shown in FIGS. 3 and 4, the address electrode 133 is formed to cross the direction in which the first and second electrodes 122 and 123 extend. The extension of the first and second electrodes 122 and 123 to intersect the address electrode 133 means that the columns of the discharge cells C through which the address electrode 133 passes, and the first and second electrodes 122, This means that the columns of the discharge cells C passing through 123 cross each other.

As the discharge gas charged in the discharge cell, a penning mixture such as Xe-Ne, Xe-He, Xe-Ne-He, etc. is used. The reason why Xe is used as the main discharge gas is that because Xe is a chemically stable inert gas, it is not dissociated due to discharge, but because the atomic number is large, the excitation voltage is lowered and the wavelength of light emitted is increased. to be. The reason for using He or Ne as a buffer gas is because the voltage reduction effect due to the panning effect due to Xe and the sputtering effect due to the high pressure are reduced. The main discharge gas may be a rare gas such as Kr in addition to Xe.

The phosphor layer 139 may be formed in the discharge cell (C). The phosphor layer 139 collides with ultraviolet light to emit visible light. In this case, the phosphor layer 139 may be formed on the side surface of the barrier rib 137 and the entire back surface dielectric layer 136 on which the barrier rib 137 is not formed.

In the conventional surface discharge type plasma display panel, when the X and Y electrodes 22 and 23 are disposed closer than necessary, unnecessary interference occurs between the X and Y electrodes 22 and 23, and thus the discharge path during discharge. Becomes short, the light emitting area is limited, and the amount of emitted ultraviolet rays is reduced, resulting in low luminance. On the contrary, when the X and Y electrodes 22 and 23 are disposed farther than necessary, the initial discharge voltage increases, and the discharge capacity is impaired. Therefore, the X and Y electrodes 22 and 23 disposed on the front substrate must have a constant gap, and therefore it is practically difficult to change the surface area of the X and Y electrodes 22 and 23.

However, in the present invention, as shown in FIG. 5, the first and second electrodes 122 and 123 face opposite discharges, and the opposite corner portions of the discharge cells C have a constant gap. In addition, in the discharge cell C of the front substrate 120 adopted in the plasma display panel 100 according to the present invention, ITO (indium tin oxide) existing in the front substrate of the conventional plasma display panel shown in FIG. A front dielectric layer covering the transparent X electrode 22a and the transparent Y electrode 23a formed of a film, the bus X electrode and the bus Y electrodes 22b and 23b formed of a metal, and the electrodes 22a, 22b, 23a and 23b. (25) and the protective film 29 do not exist, so that the front transmittance of visible light is remarkably improved from 60% to about 90% in the related art. Therefore, when the image is implemented at the luminance of the conventional level, the electrodes 122 and 123 are driven at a relatively low voltage, thereby improving the luminous efficiency.

In this case, since the first electrode 122 and the second electrode 123 serving as the X electrode and the Y electrode, respectively, are not disposed on the front substrate 120 through which visible light is transmitted, but are disposed on the side of the discharge space. Since a low resistance electrode such as a metal electrode can be used as a discharge electrode without using a transparent electrode having a high resistance as a discharge electrode, the discharge response speed is increased and low voltage driving can be performed without distortion of the waveform.

In addition, since the first and second electrodes 122 and 123 are far from the phosphor layer 139, the ions do not directly collide vertically during the sustain discharge, thereby minimizing the loss of the phosphor due to the discharge plus. have. This not only improves the lifetime of the phosphor, but also enables stable electrode and dielectric formation, thereby securing process margins and, as a result, ensuring stable discharge.

및

을 만족하는 것이 바람직하다. 만약 상기 하나의 돌출부(121b)의 양측면에 배치된 전면 유전체층(127)들의 측면(127a)간의 거리 A가 상기 격벽(137) 전면의 폭 B보다 크며 상기 조건을 만족시키지 않는다면, 격벽(137) 전방에서 형광체 여기를 통하여 발생한 가시광이나 방전 공간에서 발생한 가시광 중 격벽(137) 전방부로 향하는 것이, 전면 유전체층(127) 중 격벽(137) 전면 외부로 돌출한 부분으로 인하여 전면기판(120)을 통과하지 못하고 반사하게 되어서 패널의 휘도가 낮아지게 된다. 이는 결과적으로 패널의 효율을 감소시키기 때문이다. Meanwhile, referring to FIG. 6, when the distance between the side surfaces 127a of the front dielectric layers 127 disposed on both side surfaces of the one protrusion 121b is A, and the width of the front surface of the partition 137 is B, ,

And

It is desirable to satisfy. If the distance A between the side surfaces 127a of the front dielectric layers 127 disposed on both side surfaces of the one protrusion 121b is greater than the width B of the front surface of the partition wall 137 and does not satisfy the condition, the front of the partition wall 137 In the visible light generated through the excitation of the phosphor at the front of the partition 137 of the visible light generated in the discharge space does not pass through the front substrate 120 due to the portion of the front dielectric layer 127 protruding outside the front of the partition 137. The reflection causes lower panel brightness. This is because, as a result, the efficiency of the panel is reduced.

On the contrary, when A is smaller than B, and the condition is not satisfied, ultraviolet rays are not excited due to the interference of the partition wall 137 in the process of exciting the phosphor, thereby reducing the luminous efficiency.

Therefore, it is most preferable that the width B of the upper surface of the partition wall is equal to the distance A between the sides of the front dielectric layer disposed on both sides of the front substrate protrusion located directly above it.

Hereinafter, a driving method of the plasma display panel having the above configuration will be described. When an address voltage is applied between the address electrode 133 and the second electrode 123, an address discharge occurs, and as a result of this address discharge, the discharge cell C in which sustain discharge occurs is selected.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the second electrode 123 and the first electrode 122 of the selected discharge cell, a sustain discharge occurs between the second electrode 123 and the first electrode 122, Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet light excites the phosphor layer 139 coated in the discharge cell. The energy level of the excited phosphor layer 139 is lowered to emit visible light, and the emitted visible light forms an image.

According to the plasma display panel having the above structure, first, since there is no other element other than the substrate in the portion of the front substrate through which visible light passes, the aperture ratio can be significantly improved, and the transmittance can be improved at 60% or less. Up to about 90%.

Second, by varying the protruding length of the electrodes disposed in the partition wall for each discharge cell, the color temperature and the address discharge voltage margin can be easily corrected.

Third, even when a high concentration of Xe gas is used as the discharge gas, the luminous efficiency can be improved. When using a high concentration of Xe gas as a discharge gas in order to increase the luminous efficiency, it is difficult to drive a low voltage, the low voltage can be driven as described above in the plasma display panel of the present invention, even when using a high concentration of Xe gas as a discharge gas It becomes possible to drive and can improve luminous efficiency.

Fourth, the discharge response speed is high and low voltage driving is possible. In the plasma display panel and the flat panel display device having the same according to the present invention, since the discharge electrode is not disposed on the front substrate through which visible light is transmitted, the discharge electrode is disposed on the side of the discharge space. Since a low-resistance electrode such as a metal electrode can be used as the discharge electrode, the discharge response speed is high, and low-voltage driving is possible without distortion of the waveform.

Fifth, as the structure of the plasma display panel is drastically changed as compared with the related art, the discharge region is greatly enlarged, and the amount of plasma is greatly increased to emit a lot of ultraviolet rays.

Sixth, since the first and second electrodes are far away from the phosphor layer, the ions do not directly collide vertically during the sustain discharge, thereby minimizing the loss of the phosphor due to the discharge plus. This not only improves the lifetime of the phosphor, but also enables stable electrode and dielectric formation, thereby securing process margins and, as a result, ensuring stable discharge.

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)

A front substrate and a rear substrate disposed to face each other; A partition wall disposed between the front substrate and the rear substrate and partitioning the discharge cells together with the front substrate and the rear substrate; First and second electrodes disposed in the discharge cell; A front dielectric layer filling the first electrodes and the second electrodes; A phosphor layer disposed in the discharge cell; And And a discharge gas in the discharge cell, The front substrate includes a base portion and a plurality of protrusions extending vertically between discharge cells adjacent to each other in a first direction from the base portion. The first electrode and the second electrode are respectively disposed on the side of the protrusion facing each other for each discharge cell, When the position between the front dielectric layer disposed on both side surfaces of the one protrusion is A, and the width of the front surface of the partition wall is B,

And

Plasma display panel, characterized in that to satisfy. delete The method of claim 1, And the width of the front surface of the barrier rib is equal to the distance between the side surfaces of the front dielectric layer disposed on both sides of the front substrate protrusion located directly above the barrier rib. The method of claim 1, And at least one address electrode extending in a second direction, the direction in which the first electrode and the second electrode extend in the second direction, the direction intersecting on one plane. The method of claim 4, wherein And the address electrodes are disposed between the back substrate and the phosphor layer, and a back dielectric layer covering the address electrodes is disposed between the phosphor layer and the address electrodes. The method according to any one of claims 1 and 3 to 5, At least the front dielectric layer is covered by a protective film.

Images