KR20050093068A - Plasma display panel - Google Patents

Abstract

It is an object of the present invention to provide a plasma display panel having a sealing member having a structure in which contamination of the front substrate and the rear substrate can be effectively prevented from occurring in the vicinity of the air vents. The present invention provides a plasma display panel having a common region in which a front substrate and a back substrate overlap, wherein the common region includes a display region for displaying an image and a peripheral region surrounding the display region and having a vent formed therein. The vent is provided with a horizontal portion, a vertical portion, and an edge portion connecting the horizontal portion and the vertical portion, and surrounded by a sealing member for sealing the front substrate and the rear substrate, wherein at least a portion of the corner portion adjacent to the vent portion is disposed in the horizontal portion and the vertical portion. Plasma display, characterized in that disposed outside the virtual extension of the inner boundary line Provide a panel.

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 displaying an image by discharge of a discharge gas disposed between a front substrate and a rear substrate.

Plasma display panels, which are recently attracting attention as replacing conventional cathode ray tube display devices, have a discharge voltage applied after a gas is sealed on two substrates coated with a plurality of electrodes. The phosphor formed in a predetermined pattern by the ultraviolet rays generated by the excitation is excited to obtain a desired image.

The plasma display panel may be classified into a direct current type and an alternating current type according to a discharge type. In the DC plasma display panel, the electrodes are exposed to the discharge space so that the movement of charged particles is made directly between the corresponding electrodes. In the AC plasma display panel, some or all of the electrodes are covered with a dielectric layer, and The discharge is performed by the electric field of the wall charge instead of the direct charge transfer.

As shown in FIG. 1, a conventional AC plasma display panel 10 includes a display area D in which an image is implemented, a peripheral area S in which an image is not implemented, and terminals of respective electrodes. Can be divided into a terminal area T disposed therein.

In this case, the common area C, which is an area where the front substrate 20 showing an image to the user and the rear substrate 30 coupled to the user, overlaps, is divided into the display area D and the peripheral area S. FIG.

The display area D may be connected to a driving circuit for driving the address electrodes and the common and scan electrodes to drive the address electrode and the common and scan electrodes, so that an image may be realized by a signal of the driving circuit. In contrast, the peripheral area S is an area where an image cannot be implemented.

On the front substrate 20, a common electrode and a scan electrode are typically arranged in pairs for each light emitting cell, and on one side of the back substrate 30 opposite to a surface on which the common electrode and the scan electrode of the front substrate 20 are disposed. The address electrodes are arranged to intersect with the electrodes of the front substrate.

The common electrode and the scan electrode on the front substrate 20 are made of transparent electrodes made of transparent electrodes usually made of indium tin oxide (ITO), and are formed on a lower surface of the transparent electrode, for example, made of a metal material to reduce line resistance. It is made of a bus electrode formed in a narrow width. The space formed by the pair of common and scan electrodes and the address electrodes intersecting the common electrode and the scan electrode are thus formed to form a unit light emitting cell.

The first dielectric layer and the second dielectric layer are formed on each surface of the front substrate 20 provided with the common electrode and the scan electrode and the back substrate 30 provided with the address electrode so as to fill the electrodes.

A protective film is formed on the lower surface of the first dielectric layer. The protective film prevents damage to the dielectric layer by sputtering of plasma particles and lowers the discharge voltage and the sustain voltage due to secondary electron emission. MgO thin films by vapor deposition are generally used.

A barrier rib is formed on the second dielectric layer to maintain a discharge distance and to prevent electrical and optical crosstalk between light emitting cells. Red, green, and blue phosphors are coated on both side surfaces of the partition wall and on an upper surface of the second dielectric layer on which the partition wall is not formed.

The operation of the plasma display panel having this structure is as follows. When the light emitting cell for light emission is selected, a predetermined voltage is applied to the address electrode and the scan electrode of the light emitting cell in which the discharge is selected, so that an address discharge occurs and the wall charge is charged on the first dielectric layer. Then, when a predetermined voltage is applied between the scan electrode and the common electrode, the wall charge is moved between the two electrodes, causing the discharge gas to generate a sustain discharge, whereby the discharge gas generates ultraviolet rays. Ultraviolet rays excite the phosphor to form an image.

Meanwhile, the air vent 50 and the sealing member 40 are formed in the peripheral region S. In this case, the plasma display panel forms a transparent electrode, a bus electrode, a first dielectric layer, and a protective film on a front substrate, and forms an address electrode, a second dielectric layer, a partition, and a phosphor layer on the back substrate, and then the front substrate and the back surface. The panel is completed by assembling, sealing, exhausting, and gas encapsulating the substrate.

In this case, the vent 50 is used for residual gas exhaust and discharge gas encapsulation. That is, the vent 50 serves as a passage for discharging the gas remaining inside the exhaust pipe after the front substrate 20 and the rear substrate 30 are combined, and discharge gas such as Ne and Xe. Serves as a passage that is encapsulated from the exhaust pipe into the light emitting cell, and serves as a vacuum induction role and a gas passage together with the exhaust pipe mounted on the rear of the rear substrate.

Before the gas discharge and discharge gas are injected into the plasma display panel, the front substrate 20 and the rear substrate 30 are sealed by a sealing member 40 which is a frit. The frit is coated with a uniform width by a dispenser and then sintered in the sealing furnace, thereby serving as a sealing member to bond the front substrate and the rear substrate. The sealing member 50 is applied in the outer region of the exhaust hole 50, so that the exhaust hole 50 is formed in the region where the sealing member 50 is applied.

The sealing member is subjected to a sintering process in the coating process. In this sintering process, a frit, which is usually a glass material, may flow into the air vent 50 due to a high temperature or contaminate the air vent 50. Therefore, the frit 40 needs to be disposed to have a predetermined clearance G with the exhaust hole. In addition, the frit 40 should have an application area of a predetermined width (W) or more for adhesion of the front substrate 20 and the rear substrate 30.

In recent years, however, in the plasma display panel 10, the overall screen size is the same as the trend of the screen becomes larger, in order to satisfy this, the display area (D) is designed to be enlarged while the overall panel size is the same. Accordingly, the position of the vent 50 is also moved to the outer portion of the panel.

In this case, the application position and the application width W of the frit 50 are not changed, and as a result, the clearance G between the vent 40 and the frit 50 is reduced. This causes the frit 40 to flow down into the vent to block the vent 50 or contaminate the inside of the panel.

Furthermore, as the display area D increases, the distance between the display area D and the vent 50 decreases. In this case, when the vent 50 and the periphery of the vent are contaminated, the vent enters discharge gas and It does not play the role of residual gas emissions. For this reason, there is a problem in that, due to the residual gas that is not discharged around the air vents, and the polluted discharge gas, in particular, the false discharge occurs in the light emitting cells around the air vents.

The present invention is to solve a number of problems, including the above problems, it is effectively prevented from occurring in the inside of the vents, and around the vents due to the sealing member, the structure to seal the front substrate and the back substrate An object of the present invention is to provide a plasma display panel having an improved sealing member.

In order to achieve the above object, the first preferred embodiment of the present invention,

In the plasma display panel having a common area where the front substrate and the back substrate overlap,

The common area includes a display area for displaying an image, and a peripheral area surrounding the display area and having a vent formed therein,

The display area and the vent are provided with a horizontal part, a vertical part, and an edge part connecting the horizontal part and the vertical part, and surrounded by a sealing member for sealing the front substrate and the back substrate.

At least a portion of the edge portion adjacent to the vent is provided outside the virtual extension line of the inner boundary of the horizontal portion and the vertical portion.

In this case, the edge portion adjacent to the vent is preferably formed to be spaced apart from the vent by at least 1mm.

Further, the width of the horizontal portion, the width of the vertical portion, and the width of the corner portion are preferably substantially the same.

On the other hand, the display area is partitioned by a partition between the front substrate and the rear substrate, the light emitting cells having a phosphor layer disposed therein are disposed, the lower side of the front substrate extends over the light emitting cells continuously arranged in one direction Sustain electrode pairs are disposed, the sustain electrode pairs are covered by a first dielectric layer, the first dielectric layer is covered by a protective film, and extends over light emitting cells continuously arranged in different directions on an upper side of the back substrate. Address electrodes are disposed, and the address electrodes are preferably covered by a second dielectric layer.

In this case, the sealing member is preferably a frit.

On the other hand, according to the second embodiment of the present invention,

In the plasma display panel having a common area where the front substrate and the back substrate overlap,

The common area includes a display area for displaying an image, and a peripheral area surrounding the display area and having a vent formed therein,

The display area and the vent are provided with a horizontal part, a vertical part, and an edge part connecting the horizontal part and the vertical part, and surrounded by a sealing member for sealing the front substrate and the back substrate.

The inner boundary line of the corner portion adjacent to the vent is provided outside the virtual extension line of the inner boundary line of the horizontal portion and the vertical portion.

In this case, it is preferable that the outer boundary line of the corner portion is inside the imaginary extension line of the outer boundary line of the horizontal portion and the vertical portion.

Here, the edge portion adjacent to the vent is preferably formed by drawing the inner boundary line away from the exhaust hole.

In this case, the inner boundary line of the corner portion adjacent to the vent is preferably formed at least 1mm apart from the vent.

In addition, the width of the corner portion adjacent to the vent is preferably 0.5 times to 0.8 times the width of the vertical portion and the horizontal portion.

On the other hand, the display area is partitioned by a partition between the front substrate and the rear substrate, the light emitting cells having a phosphor layer disposed therein are disposed, the lower side of the front substrate extends over the light emitting cells continuously arranged in one direction Sustain electrode pairs are disposed, the sustain electrode pairs are covered by a first dielectric layer, the first dielectric layer is covered by a protective film, and extends over light emitting cells continuously arranged in different directions on an upper side of the back substrate. Address electrodes are disposed, and the address electrodes are preferably covered by a second dielectric layer.

In this case, the sealing member is preferably a frit.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 2 and 3, the plasma display panel according to the first embodiment of the present invention includes a front substrate 120 and a rear substrate 130.

The front substrate 120 and the rear substrate 130 are sealed by the sealing member 140, and a plurality of electrodes are excited by a phosphor formed in a predetermined pattern by ultraviolet rays generated by the discharge voltage, thereby passing through the front substrate. An image appears.

In this case, referring to FIG. 3, for example, the barrier ribs 137 may be disposed between the front substrate 120 and the rear substrate 130, which are typically glass substrates. The light emitting cells are partitioned by the partitions 137.

A plurality of sustain electrode pairs 123 and 124 extending in a predetermined pattern are disposed on the lower side of the front substrate 120 in a continuous direction in one direction, and in a different direction on the upper side of the rear substrate 130. Address electrodes 134 extending over consecutive light emitting cells are disposed.

The address electrode 134 has a predetermined pattern, for example, a stripe type or a serpentine pattern, and one or a plurality of address electrodes are formed in each light emitting cell, and usually generate an address discharge together with the scan electrode 124. Let's do it.

The address electrode 134 is covered by the second dielectric layer 136. Here, the second dielectric layer 136 may be formed on the top surface of the rear substrate 130 as shown in FIG. In this case, the address electrode 134 is formed in a predetermined pattern on the top surface of the back substrate 130, and the second dielectric layer 136 is formed to cover the address electrode 134.

The sustain electrode pair formed below the front substrate 120 generally includes a common electrode 123 and a scan electrode 124. The scan electrode 124 together with the address electrode 134 generates an address discharge. The common electrode 123 together with the scan electrode 124 generates a sustain discharge. The sustain electrode pairs 123 and 124 are covered by the first dielectric layer 126.

The sustain electrode pairs 123 and 124 may be formed on the bottom surface of the front substrate 120. In this case, it is preferable that the sustain electrode pairs 123 and 124 are disposed on the lower surface of the front substrate 120, and the first dielectric layer 126 covers the sustain electrode pairs 123 and 124.

In this case, as shown in FIG. 3, the common electrode 123 is formed on the lower surface of the front substrate and the lower surface of the transparent common electrode, respectively. The bus common electrode 123b may be provided to reduce the voltage drop.

In addition, the scan electrode 124 is formed on the lower surface of the front substrate, respectively, and the bus scanning electrode is formed on the lower surface of the transparent scan electrode to reduce the voltage drop caused by the resistance of the transparent scan electrode during discharge. 124b may be provided. However, the present invention is not limited thereto, and the bus electrode 123 and the scan electrode 124 may be composed of only the transparent electrodes 123a and 124a or may be composed of only the bus electrodes 123b and 124b.

The first dielectric layer 126 is preferably covered with a protective film 128. The protective layer 128 protects the first dielectric layer 126 from sputtering of ions, and has a relatively high secondary electron generation coefficient when low energy ions hit the surface during discharge. It lowers the driving and holding voltage of In this case, the protective film 128 is preferably formed of a film of MgO material.

A discharge gas is formed in the light emitting cell between the front substrate 120 and the rear substrate 130. As the discharge gas, a Penning mixed gas is mainly used. A buffer gas is formed of He, Ne, Ar, or a mixture thereof, and a small amount as a source of vacuum ultraviolet light that emits a phosphor layer. Xe gas is used to mix.

Partition walls 137 are disposed between the front substrate 120 and the rear substrate 130. The barrier ribs 137 are formed between the light emitting cells to partition the light emitting cells, and prevent the charged particles from crosstalk through the light emitting cells.

3 illustrates one embodiment of the front substrate 120 and the rear substrate 130 according to the present invention. The present invention is not limited thereto and may have various other structures.

The sealing member 140 is formed at the edge of the front substrate 120 and the rear substrate 130. The sealing member 140 is disposed in the peripheral area S, and surrounds the vent 150 and the display area D. Here, the peripheral area S refers to an area excluding the display area D in which an image is displayed in the common area C where the front substrate 120 and the rear substrate 130 overlap. In this case, the front substrate 120 and the rear substrate 130 may include a terminal region T in which terminals of a plurality of electrodes are formed in addition to the common region C.

The vent 150 allows the gas remaining inside to be discharged to the exhaust pipe after the front substrate 120 and the rear substrate 130 are coupled, and a passage through which discharge gas such as Ne and Xe flows into the light emitting cell from the exhaust pipe. It serves as.

In this case, the sealing member 140 includes a horizontal portion 142, a vertical portion 146, and an edge portion 144. The horizontal portion 142 is formed over the left and right of the front substrate 120 and the back substrate 130, the vertical portion 146 is formed over the top and bottom of the front substrate 120 and the back substrate 130.

The vertical portion 146 and the horizontal portion 142 are connected by the corner portion 144. In this case, the width W2 of the horizontal portion, the width W6 of the vertical portion, and the width W4 of the corner portion are substantially the same.

At least some of the corners are disposed adjacent to the vent 150. At least a portion of the corner portion adjacent to the vent 150 may be disposed outside the virtual extension line 142 of the inner boundary line of the horizontal portion 142 and the virtual extension line 146 of the inner boundary line of the vertical portion.

That is, the sealing member 140 preferably has a convex shape so as to move away from the vent 150, thereby having a separation distance (G) more than a predetermined distance from the vent 140 and the sealing member 150, As a result, the sealing member 140 flows down to the vent 150 to block the vent 150 or to prevent the inside of the panel from being contaminated.

In this case, the edge portion 144 adjacent to the vent 150 is preferably spaced apart from the vent at least 1 mm or more, the glass is a common material of the sealing member 140 by being separated by more than this separation distance (G). Flowing down into the vent 150 can be properly prevented.

On the other hand, the size of the peripheral area S is determined. Therefore, when the corner portion has the same width as the horizontal portion and the vertical portion, it may not be spaced apart from the vent more than a predetermined interval.

Therefore, in the plasma display panel 200 according to the second embodiment of the present invention, as shown in FIG. 4, the inner boundary line 244a of the corner portion 244 adjacent to the vent 250 is virtual of the horizontal inner boundary line. It is outside the imaginary extension line 246 'of the extension line 242 and the vertical inner border. Also, the outer boundary line 244b of the corner portion is inside the virtual extension lines 242 "and 246" of the outer boundary line of the horizontal portion and the vertical portion.

That is, the width W4 of the corner portion adjacent to the vent is smaller than the width W6 of the vertical portion and the width W2 of the horizontal portion, whereby the clearance K between the outer boundary of the sealing member and the end of the common region is reduced. In the horizontal portion 142, the vertical portion 146, and the corner portion 144 are formed in the same, the inner extension line of the vent and the sealing member may be formed to be spaced apart by a predetermined interval (G) or more.

In this case, the plasma display panel 200 includes a common area C in which the front substrate 220 and the rear substrate 230 overlap. The common area C includes a display area D for displaying an image, and a peripheral area S surrounding the display area and having a vent formed therein. An air vent 250 and a sealing member 240 surrounding and enclosing the air vent and the display area are disposed in the peripheral region S.

Here, a light emitting cell is disposed in the display area D of the plasma display panel 200 according to the second embodiment of the present invention, which is formed on the partition wall formed between the front substrate 220 and the rear substrate 230. It is partitioned by, and may be a structure in which the phosphor layer is formed.

In this case, the sustain electrode pairs 123 and 124, the first dielectric layer 126, the passivation layer 128, and the address electrode adopted in the plasma display panel 100 according to the first embodiment of the present invention shown in FIG. 134, the second dielectric layer 136, the partition 137, and the phosphor layer 138 are all the same members having the same function as the sustain electrode pairs and the like provided in the plasma display panel of the second embodiment of the present invention. Therefore, the sustain electrode pair, the first dielectric layer, the protective film, the address electrode, the second dielectric layer, the partition wall, and the phosphor layer, which are preferably provided in the plasma display panel according to the second embodiment of the present invention, are the sustain electrode pair shown in FIG. Use the same reference numerals.

Referring to FIG. 3, the sustain electrode pairs 123 and 124 may be disposed below the front substrate 220. The sustain electrode pairs 123 and 124 extend over light emitting cells continuously arranged in one direction, and are typically formed of a scan electrode 124 and a common electrode 123.

The sustain electrode pairs 123 and 124 are preferably covered by the first dielectric layer 126. Since the first dielectric layer 126 covers the sustain electrode pairs 123 and 124, current is limited by natural capacitive formation, and the electrode is protected from the impact of ions during discharge, thereby extending the life of the plasma display panel. .

The first dielectric layer 126 may be covered by the passivation layer 128.

Address electrodes 134 are disposed on an upper side of the rear substrate 230 disposed to face the front substrate 220. The address electrodes 134 are arranged to extend continuously from one row of light emitting cells formed across the sustain electrode pairs 123 and 124 and the light emitting cells formed in different directions.

The address electrodes 134 are preferably covered by the second dielectric layer 136. Since the structure of the plasma display panel 200 is the same as that of the plasma display panel 100 according to the first embodiment of the present invention, a detailed description thereof will be omitted.

Here, as shown in FIG. 4, the inner edge 244a of the edge portion adjacent to the vent is at least 1 mm away from the vent 250. This is because the spaced interval G is a distance to prevent the sealing member from flowing down to the air vent 250, in particular, during sintering.

In addition, the width W4 of the corner portion adjacent to the vent is preferably 0.5 to 0.8 times the width W2 of the vertical portion and the width W2 of the horizontal portion.

This means that the sealing member 240 seals the front substrate 220 and the rear substrate 230 when the width W4 of the corner portion is 0.5 times or less than the widths W6 and W2 of the vertical portion and the horizontal portion. It is difficult to achieve a sufficient role as the ash, and if the width (W4) is 0.8 times or more than the width (W6, W2) of the vertical portion and the horizontal portion it is because it does not secure a sufficient separation distance for preventing air pollution.

The sealing member 250 is preferably a frit.

According to the present invention having the above configuration, it is possible to have a structure in which the sealing member is spaced apart from the vent by a predetermined distance or more, in particular, in the plasma display panel in which the display area is enlarged and the surrounding area is reduced, the sealing member flows into the vent. Unloading or contamination around the vent can be prevented.

Therefore, the vent is not contaminated, and the residual gas can be smoothly discharged and the discharge gas can be introduced therein, thereby preventing the occurrence of erroneous discharge, particularly in the light emitting cells around the vent.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and any person skilled in the art to which the present invention pertains may have various modifications and equivalent other embodiments. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a front view illustrating a conventional plasma display panel and a sealing member and a vent provided therein;

2 is a front view illustrating a plasma display panel according to a first embodiment of the present invention, a sealing member and an air vent provided therein,

3 is a perspective view illustrating part III of FIG. 2;

4 is a front view illustrating a plasma display panel according to a second embodiment of the present invention, a sealing member and an air vent provided therein.

Explanation of symbols on main parts of drawing

100, 200: plasma display panel 120, 220: front substrate

123 and 124: sustain electrode pair 126: first dielectric layer

128: protective film 130, 230: back substrate

134: address electrode 136: second dielectric layer

137: partition wall 140, 240: sealing member

142, 242: sealing member horizontal portion 144, 244: sealing member corner portion

146 and 246: sealing member vertical portion 150 and 250: vent

244a: sealing member inner boundary line 244b: sealing member outer boundary line

C: common area D: display area

S: Peripheral area W2: Horizontal part width

W4: Corner Width W6: Vertical Width

G: Distance between inner boundary of sealing member and vent

Claims (12)

In the plasma display panel having a common area where the front substrate and the back substrate overlap, The common area includes a display area for displaying an image, and a peripheral area surrounding the display area and having a vent formed therein, The display area and the vent are provided with a horizontal part, a vertical part, and an edge part connecting the horizontal part and the vertical part, and surrounded by a sealing member for sealing the front substrate and the back substrate. And at least a portion of the corner portion adjacent to the vent is disposed outside the virtual extension line of the inner boundary of the horizontal portion and the vertical portion. The method of claim 1, And a corner portion adjacent to the vent is spaced apart from the vent by at least 1 mm. The method of claim 1, And the width of the horizontal portion, the width of the vertical portion, and the width of the edge portion are substantially the same. The method of claim 1, The display area is partitioned by barrier ribs between a front substrate and a rear substrate, and light emitting cells having a phosphor layer disposed therein are disposed. Under the front substrate, sustain electrode pairs extending over light emitting cells continuously arranged in one direction are disposed, the sustain electrode pairs are covered by a first dielectric layer, and the first dielectric layer is covered by a protective film. And an address electrode extending over light emitting cells continuously arranged in a different direction above the rear substrate, wherein the address electrodes are covered by a second dielectric layer. The method of claim 1, And the sealing member is a frit. In the plasma display panel having a common area where the front substrate and the back substrate overlap, The common area includes a display area for displaying an image, and a peripheral area surrounding the display area and having a vent formed therein, The display area and the vent are provided with a horizontal part, a vertical part, and an edge part connecting the horizontal part and the vertical part, and surrounded by a sealing member for sealing the front substrate and the back substrate. And an inner boundary line of an edge portion adjacent to the vent is outside an imaginary extension line of an inner boundary line of a horizontal portion and a vertical portion. The method of claim 6, And the outer boundary line of the corner portion is inside the virtual extension line of the outer boundary line of the horizontal portion and the vertical portion. The method of claim 7, wherein And an edge portion adjacent to the vent hole is formed such that an inner boundary line is drawn away from the exhaust hole. The method of claim 7, wherein And an inner boundary line of a corner portion adjacent to the vent is at least 1 mm away from the vent. The method of claim 9, The width of the edge portion adjacent to the vent is 0.5 to 0.8 times the width of the vertical portion and the horizontal portion. The method of claim 6, The display area is partitioned by barrier ribs between a front substrate and a rear substrate, and light emitting cells having a phosphor layer disposed therein are disposed. Under the front substrate, sustain electrode pairs extending over light emitting cells continuously arranged in one direction are disposed, the sustain electrode pairs are covered by a first dielectric layer, and the first dielectric layer is covered by a protective film. And an address electrode extending over light emitting cells continuously arranged in a different direction above the rear substrate, wherein the address electrodes are covered by a second dielectric layer. The method of claim 6, And the sealing member is a frit.