KR100467685B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a front substrate, a plurality of common and scan electrodes formed on a bottom surface of the front substrate, a bus electrode formed along one edge of the electrodes, a first dielectric layer filling the electrodes, and protecting the dielectric layer. A passivation layer, a rear substrate disposed to face the front substrate, and a top surface of the rear substrate, formed in a form orthogonal to the common and scan electrodes, and separated to correspond to each other so as to enable divided driving. A plurality of first and second address electrodes in the form of strips, a second dielectric layer filling the first and second address electrodes, a first and second address electrodes adjacent to the second dielectric layer and adjacent to the second dielectric layer A partition wall provided between the first and second address electrodes, an auxiliary partition wall formed in the space portion between the first and second address electrodes, and It includes red, green, and blue phosphor layers coated on inner partition wall.

Description

Plasma display panel {Plasma display panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure to prevent dielectric breakdown due to voltage difference between address electrodes divided up and down during an aging process.

In general, a plasma display panel inserts and discharges a discharge gas between two substrates coated with a plurality of electrodes, and then applies a discharge voltage. When the gas emits light between the two electrodes due to the discharge voltage, the display device implements a desired number, letter or graphic by applying an appropriate pulse voltage to address the intersection of the two electrodes.

The plasma display panel may be classified into a direct current type and an alternating current type according to a type of driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

The DC plasma display panel has a structure in which all electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes. On the other hand, in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and instead of direct charge transfer between the corresponding electrodes, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall. A wall voltage is formed and discharge can be maintained by a sustaining voltage.

On the other hand, in the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to face each unit pixel, and addressing discharge and sustain discharge are generated between the two electrodes. On the other hand, in the surface discharge plasma display panel, an address electrode and a common and scan electrode corresponding to each unit pixel are provided to generate addressing discharge and sustain discharge.

As shown in FIG. 1, the conventional plasma display panel 10 includes a front substrate 11 and a rear substrate 12 disposed to face the front substrate 11.

A plurality of common and scan electrodes 13 and 14 in the form of strips are alternately formed on the bottom surface of the front substrate 11, and electrodes are formed along one bottom edge of the common and scan electrodes 13 and 14. In order to reduce the line resistance of the (13) and (14), a bus electrode 15 made of a metal material formed by making the width narrower than the electrodes 13 and 14 is formed.

The first dielectric layer 16 is applied to the bottom surface of the front substrate 11 to fill the electrodes 13 and 14 and the bus electrode 15, and the bottom surface of the first dielectric layer 16 is disposed thereon. In order to protect, a protective film layer 17 made of magnesium oxide (MgO) is formed.

On the other hand, a plurality of address electrodes are formed on the upper surface of the rear substrate 12 opposite to the front substrate 11 so as to be orthogonal to the common and scan electrodes 13 and 14. As shown in FIG. 2, the address electrode includes a first address electrode 18 having a strip shape to enable divided driving, and a second strip shape having a predetermined distance from the first address electrode 18. It is formed separately from the address electrode 19.

The first and second address electrodes 18 and 19 are embedded by the second dielectric layer 100. The partition wall 110 is formed on the upper surface of the second dielectric layer 100 so as to be spaced apart by a predetermined interval. The discharge space partitioned by the partition wall 110 is filled with a gas containing xenon (Xe) as a main component. The red, green, and blue phosphor layers 120 are coated inside the partition 110.

In the conventional plasma display panel 10 having the above structure, when voltage is applied between the scan electrode 14 and the first and second address electrodes 18 and 19, preliminary discharge occurs to charge the wall charge. In this state, when a voltage is applied between the common and scan electrodes 13 and 14, sustain discharge occurs to generate plasma. From this, ultraviolet rays are radiated to excite the phosphor layer 120 to implement a desired image.

The conventional plasma display panel 10 having such a structure seals the front and rear substrates 11 and 12 and encloses exhaust and gas in a series of manufacturing processes. That is, the panel 10 maintains a high vacuum state and heats and activates a barium (Ba) or zirconium (Zr) getter to adsorb impurities and encapsulates a gas containing xenon as a main component.

Subsequently, the panel 10 is separated from the exhaust device, and a predetermined voltage is applied to cause aging discharge, and then the getter is cut to complete the panel 10.

Here, the first and second address electrodes 18 and 19 are divided. Accordingly, in the aging process, a voltage difference is generated between the electrodes 18 and 19 due to a difference in the amount of space charge accumulated. This voltage difference generates an arc discharge at opposite ends of the first and second address electrodes 18 and 19. Thus, dielectric breakdown of the electrodes 18 and 19 is caused.

In order to prevent such a phenomenon, conventionally, the first and second address electrodes 18 and 19 are commonly connected with a conductive material to eliminate the potential difference, and an aging discharge process is performed.

Therefore, when the AJ process is performed, the first and second address electrodes 18 and 19 need to be connected in common, so that the time required for the preliminary preparation work becomes long, and the process also becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a plasma display panel in which an auxiliary barrier rib is formed so as to prevent dielectric breakdown that may occur during an aging process between address electrodes divided up and down to be divided and driven. There is a purpose.

1 is an exploded perspective view illustrating a partial ablation of a plasma display panel according to a conventional example;

2 is a plan view schematically illustrating a portion of the lower substrate of FIG. 1;

3 is an exploded perspective view illustrating a partial ablation of the plasma display panel according to an embodiment of the present invention;

4 is a plan view schematically illustrating a portion of the lower substrate of FIG. 3;

<Brief description of symbols for the main parts of the drawings>

10,30 ... plasma display panel 11,31 ... front substrate

12,32 ... back substrate 13,33 ... common electrode

14,34 ... scan electrode 15,35 ... bus electrode

16,36 ... first dielectric layer 17,37 ... protective layer

18,38 ... first address electrode 19,39 ... second address electrode

100,30 ... second dielectric layer 110,310 ...

120,320 ... phosphor layer 330 ... secondary phosphor layer

340 ... Secondary bulkhead

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

Front substrate;

A plurality of common and scan electrodes alternately formed in a strip form on a lower surface of the front substrate;

A bus electrode formed along one side edge of the common and scan electrodes;

A first dielectric layer formed on a bottom surface of the front substrate and filling the electrodes;

A passivation layer formed on a bottom surface of the first dielectric layer;

A rear substrate disposed to face the front substrate;

A plurality of first and second address electrodes formed on an upper surface of the rear substrate so as to be orthogonal to the common and scan electrodes, the strips having a space formed therebetween to be divided to correspond to each other to enable divided driving;

A second dielectric layer formed on an upper surface of the rear substrate and filling the first and second address electrodes;

A partition wall disposed on an upper surface of the second dielectric layer between the first and second address electrodes and adjacent to the first and second address electrodes to partition a discharge space;

An auxiliary barrier rib formed in a space portion between the first and second address electrodes; And

And a red, green, and blue phosphor layer applied to the inside of the partition wall.

In addition, the auxiliary partition wall is characterized in that it is formed in the form of a strip in the direction parallel to the common and scan electrode in the space.

In addition, the side walls of the auxiliary partition wall, characterized in that further red, green, blue auxiliary phosphor is further applied.

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

3 illustrates a plasma display panel 30 according to an exemplary embodiment of the present invention, and FIG. 4 illustrates a portion of the lower substrate 32 of the panel 30 of FIG. 3.

3 and 4, the plasma display panel 30 is provided with a front substrate 31. On the lower surface of the front substrate 31, a plurality of pairs of discharge cells composed of a strip-shaped common electrode 33 and a scan electrode 34 are alternately formed.

On the lower surface of the common and scan electrodes 33 and 34, strip-shaped bus electrodes 35 are formed along the edge of one side in parallel with the electrodes 33 and 34 to reduce their line resistance. have. The bus electrode 35 is preferably made of a conductive material having a narrower width than the electrodes 33 and 34.

The first dielectric layer 36 is coated on the bottom surface of the front substrate 31 to fill the common and scan electrodes 33 and 34 and the bus electrode 35. On the lower surface of the first dielectric layer 36, a protective film layer 37 made of magnesium oxide is formed.

On the other hand, the panel 30 is provided with a back substrate 32 to face the front substrate 31. On the upper surface of the back substrate 32, an address electrode in a form orthogonal to the common and scan electrodes 33 and 34 is formed.

The address electrodes are formed in a strip shape so that the plurality of electrodes, the first address electrodes 38, and the second address electrodes 39 are spaced apart from each other by a predetermined interval so as to enable the divided driving. The first and second address electrodes 38 and 39 are buried by the second dielectric layer 300.

The partition wall 310 is mutually parallel to the first and second address electrodes 38 and 39 so as to define a discharge space on the top surface of the second dielectric layer 300 and to prevent cross talk. It is formed spaced apart. A gas containing xenon as a main component is injected into the discharge space formed by the partition wall 310. In addition, red, green, and blue phosphor layers 320 are coated inside the partition 310.

According to a feature of the present invention, an auxiliary barrier rib 340 is formed in a strip shape in the space A region between the first and second address electrodes 38 and 39.

More specifically, the address electrode is separated into first and second address electrodes 38 and 39 for the divided driving, and the space A region is formed at this separated interval. A plurality of first and second address electrodes 38 and 39 are provided in a strip form so as to correspond to each other with the A region therebetween.

Here, the partition wall 310 is formed between the adjacent first and second address electrodes 38 and 39 in a direction parallel to the electrodes 38 and 39. In the region A, an auxiliary barrier rib 340 is formed in a strip shape in a direction parallel to the common and scan electrodes 33 and 34 of the front substrate 31.

On the other hand, the phosphor layer 320 of red, green, and blue is formed inside the partition wall 210, and the auxiliary phosphor layer 330 is further formed on the wall surface of the auxiliary partition wall 340.

In the plasma display panel 30 according to the exemplary embodiment having the above structure, a voltage is applied between the scan electrode 34 and the first and second address electrodes 38 and 39 which are divided into two parts. Preliminary discharge occurs to charge the wall charge.

In the discharge space filled with the wall charges, a voltage is applied between the common and scan electrodes 33 and 34 to generate sustain discharge, thereby generating plasma. From this, ultraviolet rays are radiated to excite the red, green, and blue phosphor layers 320 and 330 to implement an image.

The plasma display panel 30 encapsulates the panel 30 and undergoes a process of encapsulating vacuum and encapsulating gas. At this time, the vacuum exhaust and gas filling process is as follows.

That is, the panel 30 performs exhaust using a separate exhaust device provided at a temperature of about 300 ° C. or more. As a result, impurities such as moisture existing therein are released. After the high vacuum is obtained, the barium and zirconium getters are heated and activated by a high frequency induction heating lamp. These getters adsorb gas other than the desired gas. Next, after the gas containing xenon as a main component is sealed, the panel 30 is separated from the exhaust device.

Subsequently, a predetermined voltage is applied to the panel 30 to cause aging discharge, and then the getter is cut to complete the panel 30.

On the other hand, when impurity gas is emitted from the partitions 310 and 340 and the phosphor layers 320 and 330 over a long period of time while the panel 30 is driven, a getter is attached.

Here, in the aging process, the first and second address electrodes 38 and 39 are commonly connected with a conductive material so that there is no need for a preliminary preparation process to eliminate the voltage difference between the electrodes 38 and 39.

That is, the first and second address electrodes 38 and 39 apply voltage to the common and scan electrodes 33 and 34 in a floating state to perform aging discharge. At this time, an auxiliary partition 340 is provided in an area A, which is a space between the first and second address electrodes 38 and 39. Accordingly, the arc discharge due to the difference in the charge accumulation amount of the address electrodes 38 and 39 cannot be generated because the auxiliary barrier rib 340 acts as an obstacle.

In addition, the phosphor layer 330 of red, green, and blue is formed on the wall surface of the auxiliary partition wall 340 to enlarge the area of the phosphor. Accordingly, the relative luminance decrease due to the A region between the first and second address electrodes 38 and 39 is compensated for by the expansion of the phosphor layer.

As described above, in the plasma display panel of the present invention, the following effects can be obtained by forming auxiliary partitions in a direction parallel to the common and scan electrodes in the space portion between the first and second address electrodes that are divided and driven.

First, in the assembling process including vacuum evacuation and gas encapsulation of the plasma display panel, even if the first and second address electrodes are floating in the floating state, the arc discharge can be prevented between the address electrodes due to the auxiliary partition wall. Pre-aging work such as commonly connecting the first and second address electrodes with a conductive material is unnecessary, thereby simplifying the process and greatly reducing the process time.

Second, since red, green, and blue phosphor layers are also applied to the sidewalls of the auxiliary barrier ribs, the fluorescent area is expanded, thereby compensating for the local luminance degradation due to the space between the first and second address electrodes. Thereby, the uniformity of the overall brightness of the panel can be ensured.

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

Claims (3)

Front substrate; A plurality of common and scan electrodes alternately formed in a strip form on a lower surface of the front substrate; A bus electrode formed along one side edge of the common and scan electrodes; A first dielectric layer formed on a bottom surface of the front substrate and filling the electrodes; A passivation layer formed on a bottom surface of the first dielectric layer; A rear substrate disposed to face the front substrate; A plurality of first and second address electrodes formed on an upper surface of the rear substrate so as to be orthogonal to the common and scan electrodes, the strips having a space formed therebetween to be divided to correspond to each other to enable divided driving; A second dielectric layer formed on an upper surface of the rear substrate and filling the first and second address electrodes; A partition wall disposed on an upper surface of the second dielectric layer between the first and second address electrodes and the first and second address electrodes adjacent thereto to partition the discharge space; An auxiliary barrier rib formed in a space portion between the first and second address electrodes; And And a red, green, and blue phosphor layer applied to the inside of the partition wall. The method of claim 1, And the auxiliary partition wall is formed in a strip shape in a direction parallel to the common and scan electrodes in the space part. The method of claim 2, Plasma display panel, characterized in that the auxiliary phosphor of red, green, blue is further applied to the side wall of the auxiliary partition wall.