Patent Grant
7649314
This application claims priority to and the benefit of Korean Patent Application No. 10-2005-0030666, filed in the Korean Intellectual Property Office on Apr. 13, 2005, the entire content of which is incorporated herein by reference.
1. Field of the Invention
The present invention relates to a plasma display panel, and more particularly, to a plasma display panel that can improve the structure of dummy partition walls disposed in a non-display region, prevent looseness of an outer end by providing a frit having a large width, and supply and exhaust a discharge gas while reducing noise.
2. Description of the Related Art
Generally, a plasma display panel (PDP) is a device in which vacuum ultraviolet rays emitted through gas discharge generated in discharge cells excite phosphors to realize images. The plasma display panel is a next-generation thin display device because it can have a high resolution and a large screen.
In the plasma display panel, a discharge cell is partitioned by partition walls formed in a stripe-shaped or lattice-shaped pattern between a front substrate and a rear substrate. The partition walls are formed in the discharge cells constituting a display region that substantially realizes an image and a portion of a non-display region surrounding the display region, and provides dummy cells that stabilize discharge of outermost discharge cells of the display region. The partition walls forming such dummy cells are referred to as dummy partition walls.
The front substrate and the rear substrate are attached to each other by a frit interposed therebetween, and the frit is spaced apart from the dummy partition walls at a distance that can be significant enough to generate a resonance space, which causes noise of the panel.
If the frit having a large width is used in order to reduce the resonance space, the frit may enter an exhaust tube and contaminate the panel. On the other hand, if only the partition walls are expanded in order to reduce the resonance space, the partition walls may reduce the supply and exhaust of the discharge gas and thereby reduce the panel's luminance.
The above-described partition walls are made by forming a partition wall layer with partition wall paste; patterning the partition wall layer using a sandblast method, a press method, and an etching method using photosensitive materials; and firing the patterned partition walls at a high temperature of more than 450° C. The partition walls are fired in order to remove impurities, binders, and the like contained in a partition wall material, and make the partition walls harder.
When firing the partition walls, all vehicle components existing in the partition wall paste are evaporated, and main components constituting the partition walls are contracted by coupling with one another.
In this case, if the lattice structure of the partition walls of the plasma display panel is rectangular, as shown in
Also, since the balance of force is not uniformly maintained at the outermost end of the partition walls, the partition wall is lifted inward when firing and thus looseness occurs. Thus, the outermost end rises out of other portions. As a result, as shown in
An embodiment of the present invention provides a plasma display panel in which a resonance space formed between a frit and dummy partition walls is reduced, thereby suppressing noise and allowing smooth supply and exhaust of a discharge gas.
Another embodiment of the present invention provides a plasma display panel that can suppress changes in shapes of partition walls so as to prevent the partition walls from being bent, thereby suppressing noise.
Another embodiment of the present invention provides a plasma display panel that can suppress changes in shapes of partition walls so as to improve uniformity of the heights of the partition walls and prevent a gap from being generated between the partition walls and a front substrate, thereby suppressing noise.
According to a first embodiment of the present invention, a plasma display panel includes a front substrate and a rear substrate that are disposed to face each other, address electrodes and display electrodes that are spaced from each other and each extend along directions intersecting each other between the front substrate and the rear substrate, and partition walls that form a display region while partitioning a plurality of discharge cells and form a non-display region along the periphery of the display region between the front substrate and the rear substrate. The non-display region includes dummy areas in which dummy cells are partitioned by dummy partition walls spaced apart from the display region at a plurality of intervals.
Each of the dummy areas includes a horizontal partition wall band formed in a band shape in parallel to one edge of the display region and a fan-shaped portion at both ends of the horizontal partition wall band, the fan-shaped portion being surrounded by an outer arc-shaped portion. The dummy areas may be provided on both sides of the display region along an extension direction of the address electrodes.
The horizontal partition wall band may include at least one horizontal partition wall member between an outermost horizontal partition wall member and an innermost horizontal partition wall member. In one embodiment, a distance between the outermost horizontal partition wall member and an adjacent horizontal partition wall member and a distance between the innermost horizontal partition wall member and an adjacent horizontal partition wall member may each be less than a distance between a pair of horizontal partition wall members located between the outermost horizontal partition wall member and the innermost horizontal partition wall member.
A line width of the outermost horizontal partition wall member may be wider than any other horizontal partition wall members.
The fan-shaped portion may include oblique partition wall members that linearly extend from a center of a line, which connects an end of the outermost horizontal partition wall member to an end of the innermost horizontal partition wall member, to the outer arc-shaped portion, respectively. In one embodiment, the oblique partition wall members may angularly quadrisect the fan-shaped portion. Also, the line which connects the front end of the outermost horizontal partition wall member with the front end of the innermost horizontal partition wall member may be shared by the horizontal partition wall band and the fan-shaped portion.
The outer arc-shaped portion may be connected to the outermost horizontal partition wall member of the horizontal partition wall band in the extension direction thereof, and the outermost horizontal partition wall member of the horizontal partition wall band may be formed in a linear shape. Further, the outer arc-shaped portion may be connected to the innermost horizontal partition wall member of the horizontal partition wall band in the extension direction thereof, and the innermost horizontal partition wall member of the horizontal partition wall band may be formed in a linear shape.
The outer arc-shaped portion may have a line width that is gradually widened from the innermost horizontal partition wall member to the outermost horizontal partition wall member of the horizontal partition wall band.
The fan-shaped portion may include arc-shaped partition wall members which respectively extend from one point of the horizontal partition wall band to another point thereof in an arc shape. In one embodiment, a distance between the outer arc-shaped portion of the fan-shaped portion and an adjacent arc-shaped partition wall member may be greater than a distance between the horizontal partition wall band and an adjacent arc-shaped partition wall member.
The fan-shaped portion may include rib partition wall members that linearly extend from the outer arc-shaped portion to at least one of the arc-shaped partition wall members and/or formed between adjacent ones of the arc-shaped partition wall members. In one embodiment, each of the rib partition wall members may divide each of the arc-shaped partition wall members at constant intervals. Each of the rib partition wall members may have a line width less than that of each of the arc-shaped partition wall members.
A line width of a frit for sealing the front substrate and the rear substrate may be greater than an interval between an inner surface of the frit and an outer surface of the dummy areas. In one embodiment, the line width of the frit is 2 to 3 times as larger as the interval between the inner surface of the frit and the outer surface of the dummy areas.
According to a second embodiment of the invention, a plasma display panel includes a first dummy area that is spaced apart from the display region and disposed in the non-display region, and a second dummy area that is spaced apart from the first dummy area and in which dummy cells are partitioned by dummy partition walls extending from partition walls disposed in the display region.
In one embodiment, the first dummy area may be formed similarly to the dummy area in the first embodiment of the invention described above. That is, the first dummy area includes a first horizontal partition wall band formed in a band shape in parallel to one edge of the display region, and a first fan-shaped portion surrounded by a first outer arc-shaped portion and on both sides of the first horizontal partition wall band.
The second dummy area includes a second fan-shaped portion that is disposed on an outside corner of the display region and is surrounded by a vertical line portion and a horizontal line portion intersecting each other and a second outer arc-shaped portion intersecting both line portions, a second horizontal partition wall band that comes in contact with the vertical line portion of the second fan-shaped portion, and a first vertical partition wall band that comes in contact with the horizontal line portion of the second fan-shaped portion.
An island partition wall member may be separately formed in a space between the first fan-shaped portion of the first dummy area and the second fan-shaped portion of the second dummy area so as to be spaced apart from the respective dummy areas. The island partition wall member may have a circular or ring-shaped section.
The second fan-shaped portion may include a second oblique partition wall member that linearly extends from an intersection of the vertical line portion and the horizontal line portion to the second outer arc-shaped portion. The second fan-shaped portion may include arc-shaped partition wall members that respectively extend from one point of the second horizontal partition wall band to another point thereof in an arc shape.
The second fan-shaped portion may include second rib partition wall members that linearly extend from the second outer arc-shaped portion to at least one of the arc-shaped partition wall members and/or are formed between adjacent ones of the arc-shaped partition wall members. Each of the arc-shaped partition wall members may be connected to a partition wall member of the second horizontal partition wall band and a partition wall member of the first vertical partition wall band in the extension direction thereof.
The vertical line portion and the horizontal line portion of the second fan-shaped portion may be shared by the second horizontal partition wall band and the first vertical partition wall band.
The second horizontal partition wall band may include at least one horizontal partition wall member between an outermost horizontal partition wall member and an innermost horizontal partition wall member. A distance between the outermost horizontal partition wall member and an adjacent horizontal partition wall member may be less than a distance between the innermost horizontal partition wall member and an adjacent horizontal partition wall member.
The first vertical partition wall band may include at least one vertical partition wall member between an outermost vertical partition wall member and an innermost vertical partition wall member. A distance between the outermost vertical partition wall member and an adjacent vertical partition wall member may be larger than a distance between the innermost vertical partition wall member and an adjacent vertical partition wall member.
The second outer arc-shaped portion may be connected to an outermost horizontal partition wall member of the second horizontal partition wall band in an extension direction thereof, and the second outer arc-shaped portion may be connected to an outermost vertical partition wall member of the first vertical partition wall band in an extension direction thereof.
According to a third embodiment of the invention, a plasma display panel includes a third dummy area in which dummy cells are partitioned by dummy partition walls extending from the second dummy area in an extension direction of a plurality of display electrodes and in the non-display region.
The third dummy area may be provided on both sides of the second dummy area in the extension direction of the plurality of display electrodes. Each third dummy area may include a third fan-shaped portion that is disposed on an inside corner of the display region and surrounded by a vertical line portion and a horizontal line portion intersecting each other and a third outer arc-shaped portion intersecting both line portions, and a second vertical partition wall band that comes in contact with the horizontal line portion of the third fan-shaped portion.
The third dummy area may further include a third vertical partition wall band that comes in contact with the vertical line portion of the third fan-shaped portion and the second vertical partition wall band connected thereto and is connected to the second dummy area.
The third fan-shaped portion may include at least one third oblique partition wall member that linearly extends from an intersection of the vertical line portion and the horizontal line portion to the third outer arc-shaped portion, and arc-shaped partition wall members that respectively extend from one point of the vertical line portion to one point of the horizontal line portion. Further, the third fan-shaped portion may include rib partition wall members that linearly extend from the third outer arc-shaped portion to at least one of the arc-shaped partition wall members and/or are formed between adjacent ones of the arc-shaped partition wall members.
The third outer arc-shaped portion may be connected to an outermost horizontal partition wall member of the third vertical partition wall band in an extension direction thereof and the outermost horizontal partition wall member of the third vertical partition wall band may be formed in a linear shape. Further, the third arc-shaped portion may be connected to an outermost vertical partition wall member of the third vertical partition wall band in an extension direction thereof, and the outermost vertical partition wall member of the third vertical partition wall band may be formed in a linear shape.
The accompanying drawings, together with the specification, illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the invention.
In the following detailed description, certain exemplary embodiments of the present invention are shown and described, by way of illustration. As those skilled in the art would recognize, the described exemplary embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, rather than restrictive. There may be parts shown in the drawings, or parts not shown in the drawings, that are not discussed in the specification as they are not essential to a complete understanding of the invention. Like reference numerals designate like elements.
As shown in
In the display region D, a plurality of discharge cells are partitioned by partition walls that are disposed between the front substrate 10 and the rear substrate 15. The non-display region is divided into a first dummy area M1 in which first dummy cells are partitioned by first dummy partition walls spaced apart from the display region D, a second dummy area M2 that is spaced from the first dummy area M1 and in which second dummy cells are partitioned by second dummy partition walls extending from the partition walls disposed in the display region D, and a redundant area E that is disposed outside the first dummy area M1 and the second dummy area M2 so as to form a space up to a frit 12 for sealing the front substrate 10 and the rear substrate 15.
The first dummy area M1 may be formed on four places corresponding to four sides of the second dummy area M2 surrounding the display region D or may be formed on two sides along a vertical direction (
As also shown in
Since the first dummy area M1, the second dummy area M2, and the third dummy area M3 reduce a resonance space formed in the non-display region, noise occurring in the resonance space can be reduced. Further, the first dummy area M1 is spaced apart from the display region D, the second dummy area M2, and the third dummy area M3, and supply and exhaust paths of discharge gas are formed between the dummy areas. With these additional dummy areas (e.g., the dummy areas M1, M2, and M3), the supply and exhaust resistance of the discharge gas can be minimized and thus the discharge gas can be smoothly supplied and exhausted through an exhaust tube H.
The first dummy area M1 is spaced apart from the display region D and includes a first horizontal partition wall band 201 in a band shape that is formed in parallel to one edge of the display region D and a first fan-shaped portion 30, that is surrounded by a first outer arc-shaped portion 3051 see
The first horizontal partition wall band 201 includes horizontal partition wall members that are formed in a direction parallel to the one edge of the display region D and vertical partition wall members that are formed in a direction to intersect the horizontal partition wall members, thereby forming a plurality of first dummy cells. At least one of the horizontal partition wall members may be formed between an outermost horizontal partition wall member 201 and an innermost horizontal partition wall member 203 of the first horizontal partition wall band 201. In the present embodiment, four horizontal partition wall members are formed therebetween.
In this case, a distance L20o, between the outermost horizontal partition wall member 201 and an adjacent horizontal partition wall member 211 and a distance L20i1 between the innermost horizontal partition wall member 203 and an adjacent horizontal partition wall member 211 are less than a distance L20t1 between two adjacent ones of the horizontal partition wall members 211 that are disposed between the outermost horizontal partition wall member 201 and the innermost horizontal partition wall member 203. In the present embodiment, the distance L20o1 and the distance L20i1 have the same value, which is a half of the distance L20t1.
Also, as regards to the partition wall members disposed inside the first horizontal partition wall band 201 a constant force acts in four directions, so that bending does not occur. However, the balance of force may be upset at an end, such as the outermost horizontal partition wall member 201. Accordingly, looseness at a bottom surface of the outermost horizontal partition wall member 201 may occur that is caused by a removal of the outermost horizontal partition wall member 201 from a dielectric layer. In order to prevent this problem, the outermost horizontal partition wall member 201 is maintained from an adjacent horizontal partition wall member 211 at a short distance L20o1 by vertical partition wall members so as to efficiently cope with attractive forces that occur when firing. Further, the outermost horizontal partition wall member 201 has a line width larger than that of other horizontal partition wall members 211, such that the partition wall can be efficiently prevented from being damaged when the partition wall layer is etched by a sandblast method. Here, the line width of each of the partition wall members can be defined as the width between an upper end and a lower end with respect to a longitudinal direction of the respective partition wall member.
The first fan-shaped portion 30, is surrounded by the first outer arc-shaped portion 3051 from a center C1 of a line 301, which extends from a front (or lower) end of the outermost horizontal partition wall member 201 to a front (or lower) end of the innermost horizontal partition wall member 203, to form a semicircle region. The first horizontal partition wall band 201 comes in contact with the line 301. In the present embodiment, the first outer arc-shaped portion 3051 of the first fan-shaped portion 301 may be formed such that the inner surface thereof is spaced apart from the center C1 of the line 301 at a constant distance.
First oblique partition wall members 3111 linearly extending from the center C1 of the line 301 to the first outer arc-shaped portion 3051 are formed in the first fan-shaped portion 301 of the first dummy area M1. The number of the first oblique partition wall members 3111 may be three such that the first fan-shaped portion 301 is angularly quadrisected. Accordingly, if the first fan-shaped portion 301 is formed in a semicircle shape, as shown in
Arc-shaped partition wall members 321 and 322 which extend from one point of the first horizontal partition wall band 201 to another point thereof in an arc shape are formed in the first fan-shaped portion 301 of the first dummy area M1. In the present embodiment, the two arc-shaped partition wall members 321 and 322 are disposed between the first outer arc-shaped portion 3051 and the center C1.
In addition, a distance L30o1 between the first outer arc-shaped portion 3051 and adjacent arc-shaped partition wall member 321, a distance L30t1 between the arc-shaped partition wall members 321 and 322, and a distance L30i1 between the arc-shaped partition wall member 322 and the center C1 may be different from one another. In the present embodiment, the distance L30i1 between the center C1 and the adjacent arc-shaped partition wall member 322 is greater than the distance L30o1 between the first outer arc-shaped portion 3051 and the adjacent arc-shaped partition wall member 321 and is also greater than the distance L30t, between the adjacent arc-shaped partition wall members 321 and 322. In
Further, first rib partition wall members 3311 that linearly extend from the first outer arc-shaped portion 3051 to the arc-shaped partition wall members 321 and 322 are formed in the first fan-shaped portion 301 of the first dummy area M1. Each of the first rib partition wall members 3311 has a line width that is less than a line width of each of the first arc-shaped partition wall members 321 and 322.
The first rib partition wall members 3311 may be formed so as to divide the arc-shaped partition wall members 321 and 322 at uniform intervals. The number of the first rib partition wall members 3311 disposed between the first outer arc-shaped portion 3051 and the adjacent arc-shaped partition wall member 321 may be greater than the number of the first rib partition wall members 3311 disposed between the adjacent arc-shaped partition wall members 321 and 322.
In addition, the first horizontal partition wall band 201 and the first fan-shaped portion 301 share the line 301 that connects the front end of the outermost horizontal partition wall member 201 to the front end of the innermost horizontal partition wall member 203 in the first dummy area M1. That is, the line 301 separates the first horizontal partition wall band 201 from the first fan-shaped portion 301.
The first outer arc-shaped portion 3051 is connected to the outermost horizontal partition wall member 201 of the first horizontal partition wall band 201 in the extension direction thereof, and the outermost horizontal partition wall member 201 of the first horizontal partition wall band 201 is formed in a linear shape. Further, the first outer arc-shaped portion 3051 is connected to the innermost horizontal partition wall member 203 of the first horizontal partition wall band 201 in the extension direction thereof, and the innermost horizontal partition wall member 203 of the first horizontal partition wall band 201 is formed in a linear shape. The outermost horizontal partition wall member 201 and the innermost horizontal partition wall member 230 are formed in linear shapes and thus serve as supports for preventing the ends of the partition walls from loosening.
The first outer arc-shaped portion 3051 has a line width which is gradually widened from the innermost horizontal partition wall member 203 to the outermost horizontal partition wall member 201 of the first horizontal partition wall band 201. The front end at the outermost horizontal partition wall member 201 of the first outer arc-shaped portion 3051 has a line width equal to that of the outermost horizontal partition wall member 201, and the front end at the innermost horizontal partition wall member 203 of the first outermost arc-shaped portion 3051 has a line width equal to that of the innermost horizontal partition wall member 203.
Accordingly, the first outer arc-shaped portion 3051 has a line width greater than that of each of the arc-shaped partition wall members 321 and 322, the first oblique partition wall members 3111, and the first rib partition wall members 3311 so as to efficiently prevent the partition wall from being damaged when the partition wall layer is etched by using a sandblast method. Further, each of the arc-shaped partition wall members 321 and 322, the first oblique partition wall members 3111, and the first rib partition wall members 3311 has a relatively narrow line width.
As regards the partition wall members disposed inside the first horizontal partition wall band 201, constant force acts in four directions, such that bending does not occur. However, since the arc-shaped partition wall members 321 and 322, the first oblique partition wall members 3111, and the first rib partition wall members 3311 disposed inside the first fan-shaped portion 301 are formed at the end of the first horizontal partition wall band 201, the balance of the force may be upset. Accordingly, a looseness may occur that is caused by the phenomenon that the bottom surface of each of the ends of the partition walls may be removed from the dielectric layer. However, in the present embodiment of the invention, the attractive force between the partition wall members in the panel is lowered by reducing the line width of each of the arc-shaped partition wall members 321 and 322, the first oblique partition wall members 3111, and the first rib partition wall members 3311, and thus the ends of the partition walls can be prevented from being lifted.
Referring to
Each of the second fan-shaped portions 302 is surrounded by a vertical line portion 302 and a horizontal line portion 303, which intersect each other, and a second outer arc-shaped portion 3052, which intersects both line portions 302 and 303 so as to form a fan-shaped region. A respective second horizontal partition wall band 202 comes in contact with the vertical line portion 302, and a respective first vertical partition wall band 402 comes in contact with the horizontal line portion 303.
In the present embodiment, the second outer arc-shaped portion 3052 of a respective second fan-shaped portion 302 is spaced apart from a second intersection C2 of the vertical line portion 301 and the horizontal line portion 303 at a constant distance. In addition, if the vertical line portion 302 is orthogonal to the horizontal line portion 303 (as shown in
A second oblique partition wall member 3112 which linearly extends from the second intersection C2 of the vertical line portion 302 and the horizontal line portion 303 to the second outer arc-shaped portion 3052 is formed in the second fan-shaped portion 302 of the second dummy area M2. The second oblique partition wall member 3112 bisects an angle which the vertical line 302 and the horizontal line portion 303 make. Accordingly, in the present embodiment, if the vertical line portion 302 is orthogonal to the horizontal line portion 303, the angle that the second oblique partition wall member 3112 and the vertical line portion 302 or the horizontal line portion 303 make can become 45 degrees.
Arc-shaped partition wall members 323, 324, and 325 which extend from one point of the vertical line portion 302 to one point of the horizontal line portion 303 are formed in the second fan-shaped portion 302 of the second dummy area M2. In the present embodiment, three arc-shaped partition wall members 323, 324, and 325 are disposed between the second outer arc-shaped portion 3052 and the second intersection C2. In
Further, second rib partition wall members 3312, which linearly extend from the second outer arc-shaped portion 3052 to the arc-shaped partition wall members 323, 324, and 325, and second rib partition wall members 3322, which linearly extend from the second arc-shaped portion 3052 to the arc-shaped partition wall member 323, are formed in the second fan-shaped portion 302 of the second dummy area M2. In
The second rib partition wall members 3312 and 3322 divide the arc-shaped partition wall members 323, 324, and 325 at constant intervals. The number of the second rib partition wall members 3312 and 3322 disposed between the second outer arc-shaped portion 3052 and adjacent arc-shaped partition wall member 323 may be greater than the number of the second rib partition wall members 3312 disposed among adjacent arc-shaped partition wall members 323, 324, and 325.
In addition, the second horizontal partition wall band 202 and the first vertical partition wall band 402 share the vertical line portion 302 and the horizontal line portion 303 of the second fan-shaped portion 302 of the second dummy area M2. That is, the vertical line portion 302 separates the second horizontal partition wall band 202 from the second fan-shaped portion 302, and the horizontal line portion 303 separates the first vertical partition wall band 402 from the second fan-shaped portion 302.
The second horizontal partition wall band 202 includes horizontal partition wall members parallel to one edge of the display region D and vertical partition wall members intersecting the horizontal partition wall members so as to form a plurality of second dummy cells. At least one horizontal partition wall member may be formed between an outermost horizontal partition wall member 204 and an innermost horizontal partition wall member 205 of the second horizontal partition wall band 202. In the present embodiment, two horizontal partition wall members 212 are formed therebetween. In
The first vertical partition wall band 402 includes horizontal partition wall member parallel to one edge of the display region D and vertical partition wall members intersecting the horizontal partition wall members so as to form a plurality of second dummy cells. At least one vertical partition wall member may be formed between an outermost vertical partition wall member 401 and an innermost vertical partition wall member 403 of the first vertical partition wall band 402. In the present embodiment, three vertical partition wall members 411 are formed therebetween. In
Further, a horizontal partition wall member 4212 intersecting the outermost vertical partition wall member 401 has a line width less than that of the outermost vertical partition wall member 401. As regards to the partition wall members (e.g., the vertical partition wall members 411) disposed inside the first vertical partition wall band 402, constant force acts in four directions, such that bending does not occur. However, the balance of force may be upset at the end of the outermost vertical partition wall member 401. Accordingly, a looseness may occur that is caused by the phenomenon that the bottom surface of each of the ends of the partition walls may be removed from the dielectric layer. In order to prevent this problem, the line width of the horizontal partition wall member 4212 intersecting the outermost vertical partition wall member 401 in the first vertical partition wall band 402 is less than that of the horizontal partition wall member (or each of the horizontal partition wall members) in the display region D so as to reduce the attractive force between the partition wall members toward the panel. Therefore, the outermost vertical partition wall member 401 stands against the attractive force and thus the ends of the partition walls can be prevented from being lifted.
Furthermore, the first vertical partition wall band 402 includes a first bar partition wall member 4312 which linearly extends from the outermost vertical partition wall member 401 through the vertical partition wall members 411 to the innermost vertical partition wall member 403. A line width of the first bar partition wall member 4312 is less than that of the horizontal partition wall member in the display region D. The first bar partition wall member 4312 allows the distance between adjacent horizontal partition wall members 4212 to be small in each of the second dummy cells formed by the vertical partition wall members 411 and the horizontal partition wall members 4212, such that the other vertical partition wall members 411 and the outermost vertical partition wall members 401 stand against the attractive force for bending the partition wall members toward the center of the panel when the partition walls are fired, and thus the ends of the partition walls can be prevented from being lifted.
The second outer arc-shaped portion 3052 of the second fan-shaped portion 302 of the second dummy area M2 is connected to the outermost horizontal partition wall member 204 of the second horizontal partition wall band 202 in one extension direction. In addition, the outermost horizontal partition wall member 204 of the second horizontal partition wall band 202 is formed in a linear shape.
Similarly, the second outer arc-shaped portion 3052 of the second fan-shaped portion 302 of the second dummy area M2 is connected to the outermost vertical partition wall member 401 of the first vertical partition wall band 402 in the other extension direction. In addition, the outermost vertical partition wall member 401 of the second horizontal partition wall band 402 is formed in a linear shape.
Moreover, an island partition wall member 50 may be disposed between one front end of the first dummy area M1 and one front end of adjacent second dummy area M2. That is, the island partition wall member 50 is separately spaced apart from the dummy areas M1 and M2 between the first fan-shaped portion 301 of the first dummy area M1 and the second fan-shaped portion 302 of the second dummy area M2. The island partition wall member 50 is spaced apart from the front end of the first dummy area M1 and the front end of the second dummy area M2, such that a supply and exhaust path of the discharge gas is formed in the periphery of the island partition wall member 50 so as to smoothly supply and exhaust the discharge gas when the discharge gas is supplied and exhausted through an exhaust tube H (shown in
Further, a line width of the frit 12 for sealing the front substrate 10 and the rear substrate 15 may be greater than an interval between an inner surface of the frit 12 and an outer surface of the first dummy area M1 in order to reduce the resonance space of the redundant area E, as shown in
Generally, in a comparison example, the interval is 6 mm, and the line width of the frit 12 is 4 to 5 mm. However, in the embodiment of the present invention, the first dummy area M1 is provided, and thus the interval is set to 1 to 2 mm, and the line width of the frit 12 is set to 5 to 7 mm. In the embodiment of the present invention, it can be experimentally seen that front and rear noises are reduced as compared with the comparison example.
Referring to
The third fan-shaped portion 303 is disposed on a corner of the third dummy area M3 and is surrounded by a vertical line portion 304 and a horizontal line portion 305 intersecting each other and a third outer arc-shaped portion 3053 intersecting both line portions 304 and 305 so as to form a fan-shaped region. The second vertical partition wall band 403 comes in contact with the horizontal line portion 305 of the third fan-shaped portion 303.
Furthermore, the third dummy area M3 including the third fan-shaped portion 303 and the second vertical partition wall band 403 may be connected to the second dummy area M2. In the present embodiment, the third dummy area M3 is connected to the second dummy area M2 through a third vertical partition wall band 40a3. The third vertical partition wall band 40a3 comes in contact with the vertical line portion 304 of the third fan-shaped portion 303 and the second vertical partition wall band 403 connected thereto and is connected to the second dummy area M2.
In the present embodiment, the third outer arc-shaped portion 3053 of the third fan-shaped portion 303 is spaced apart from a third intersection C3 of the vertical line portion 304 and the horizontal line portion 305 at a constant interval. In addition, if the vertical line portion 304 is orthogonal to the horizontal line portion 305, the third fan-shaped portion 303 has a quadrisected circle shape.
A third oblique partition wall member 3113 which linearly extends from the intersection C3 of the vertical line portion 304 and the horizontal line portion 305 to the third outer arc-shaped portion 3053 is formed in the third fan-shaped portion 303 of the third dummy area M3. The third oblique partition wall member 3113 is formed so as to bisect an angle which the vertical line portion 304 and the horizontal line portion 305 make. Accordingly, in the present embodiment, if the vertical line portion 304 is orthogonal to the horizontal line portion 304, the angle that the third oblique partition wall member 3113 and the vertical line portion 304 or the horizontal line portion 305 make can become 45 degrees.
Arc-shaped partition wall members 326, 327, 328, and 329 which extend from one point of the vertical line portion 304 to one point of the horizontal line portion 305 are formed in the third fan-shaped portion 303 of the third dummy area M3. In the present embodiment, four arc-shaped partition wall members 326, 327, 328, and 329 are disposed between the third outer arc-shaped portion 3053 and the third intersection C3. In
Further, third rib partition wall members 3313, which linearly extend from the third outer arc-shaped portion 3053 to the arc-shaped partition wall members 326, 327, 328, and 329, and third rib partition wall members 3322, which linearly extend from the second arc-shaped portion 3053 to the arc-shaped wall member 326, are formed in the third fan-shaped portion 303 of the third dummy area M3. In
The third rib partition wall members 3313 and 3323 may be formed so as to divide the arc-shaped partition wall members 326, 327, 328, and 329 at constant intervals. Further, the number of the third rib partition wall members 3313 and 3323 disposed between the third outer arc-shaped portion 3053 and adjacent arc-shaped partition wall member 326 is greater than the number of the rib partition wall members 3313 disposed among adjacent arc-shaped partition wall members 326, 327, 328 and 329.
In addition, the third vertical partition wall band 40a3 and the second vertical partition wall band 403 share the vertical line portion 304 and the horizontal line portion 305 of the third fan-shaped portion 303 of the third dummy area M3. That is, the vertical line portion 304 separates the third fan-shaped portion 303 from the third vertical partition wall band 40a3, and the horizontal line portion 305 separates the third fan-shaped portion 303 from the second vertical partition wall band 403.
The second vertical partition wall band 403 includes horizontal partition wall members connected to horizontal partition wall members of the third vertical partition wall band 40a3 and vertical partition wall members intersecting the horizontal partition wall members so as to form a plurality of third dummy cells. At least one vertical partition wall member may be formed between an outermost vertical partition wall member 404 and an innermost vertical partition wall member 406 of the second vertical partition wall band 403.
The second vertical partition wall band 403 includes an outer vertical partition wall band 4013 that is outwardly connected to the horizontal line portion 305 of the third fan-shaped portion 303 and an inner vertical partition wall band 4023 that is disposed inside the outer vertical partition wall band 4013 and is inwardly connected to the horizontal line portion 305.
At least one vertical partition wall member may be formed between the outermost vertical partition wall member 404 and the innermost vertical partition wall member 405 of the outer vertical partition wall band 4013. In the present embodiment, one vertical partition wall member 412 is formed therebetween.
The outer vertical partition wall band 4013 and the inner vertical partition wall band 4023 share the innermost vertical partition wall member 405. Further, at least one vertical partition wall member may be formed between the innermost vertical partition wall member 406 and the vertical partition wall member 405, which is also the outermost vertical partition wall member of the inner vertical partition wall band 4023. In the present embodiment, six vertical partition wall members 413 are formed therebetween. The second vertical partition wall band 403 and the third vertical partition wall band 40a3 share the innermost vertical partition wall member 406.
In
Further, the third vertical partition wall band 40a3 shares the innermost vertical partition wall member 406 of the second vertical partition wall band 403 and has at least one vertical partition wall member 414 between the innermost vertical partition wall member 406 and the outermost vertical partition wall member 401 (see
Further, a line width of the horizontal partition wall member 422 intersecting the outermost vertical partition wall member 404 is less than that of the outermost vertical partition wall member 404.
As regards to the partition wall members (e.g., the vertical partition wall member 413) disposed inside the second vertical partition wall band 403, constant force acts in four directions, such that bending does not occur. However, the balance of force may be upset at the end of the outermost vertical partition wall member 404. Accordingly, a looseness may occur that is caused by the phenomenon that the bottom surface of each of the ends of the partition walls may be removed from the dielectric layer. In order to prevent this problem, the line width of the horizontal partition wall member 422 intersecting the outermost vertical partition wall member 404 in the outermost vertical partition wall band 4013 of the second vertical partition wall band 403 is less than that of the horizontal partition wall member in the inner vertical partition wall band 4023 so as to reduce the attractive force between the partition wall members to the panel. As a result, the outermost vertical partition wall member 404 stands against the attractive force, and thus the ends of the partition walls can be prevented from being lifted.
Furthermore, the outer vertical partition wall band 4013 of the second vertical partition wall band 403 includes a second bar partition wall member 4313 which linearly extends from the outermost vertical partition wall member 404 through the vertical partition wall member 412 to the innermost vertical partition wall member 405. A line width of the second bar partition wall member 4313 is less than that of each of the horizontal partition wall members in the inner vertical partition wall band 4023. The second bar partition wall member 4313 allows the other vertical partition wall member 412 and the outermost vertical partition wall member 404 to stand against the attractive force for bending the partition wall member toward the center of the panel when the partition walls are fired, and thus the ends of the partition walls can be prevented from being lifted.
The third outer arc-shaped portion 3053 of the third fan-shaped portion 303 of the third dummy area M3 is connected to the outermost horizontal partition wall member 206 of the third vertical partition wall band 40a3 in one extension direction. In addition, the outermost horizontal partition wall member 206 of the third vertical partition wall band 40a3 is formed in a linear shape.
Similarly, the third outer arc-shaped portion 3053 of the third fan-shaped portion 303 of the third dummy area M3 is connected to the outermost vertical partition wall member 404 of the second vertical partition wall band 403 in the other extension direction. In addition, the outermost horizontal partition wall member 404 of the second vertical partition wall band 403 is formed in a linear shape.
The outermost horizontal partition wall member 206 and the outermost horizontal partition wall member 404 are formed in the linear shapes, and thus they serve as supports for preventing the ends of the partition walls from loosening.
Referring to
Address electrodes 77 are formed on the rear substrate 15 along one direction, and a dielectric layer 75 is formed on the entire surface of the rear substrate to cover the address electrodes 77. As described above, the partition walls have a predetermined pattern, and the discharge cells 70 and the dummy cells 80 are formed on the dielectric layer 75. Luminescent layers 73 for generating visible light of red, green and blue are coated in the discharge cells 70 and serve as pixels.
In addition, display electrodes 61 and 62 (see
A dielectric layer 68 covering the display electrodes 61 and 62 may be formed, and an MgO protective film 69 for protecting the dielectric layer 68 and increasing an emission coefficient of a secondary electron during the discharging may also be formed.
As shown in
As shown in
As shown in
As described above, according to a plasma display panel of the present invention, a first dummy area is disposed in a non-display region spaced apart from a display region, and a line width of a frit for sealing a front substrate and a rear substrate increases so as to reduce a resonance space formed between the frit and a plurality of dummy partition walls. Accordingly, noise can be prevented from occurring in the resonance space and a discharge gas can be smoothly supplied and exhausted. The smooth supply and exhaust of the discharge gas prevents a brightness of the plasma display panel from deteriorating.
Furthermore, in one embodiment, first, second, and third fan-shaped portions are provided in first, second, and third dummy areas formed in a non-display region. Further, a first horizontal partition wall band, a second horizontal partition wall band (and/or a first vertical partition wall band), and a second vertical partition wall band are provided adjacent to the first, second, and third fan-shaped portions, respectively. Accordingly, bending of a dummy partition wall and a looseness of the outer end of the dummy partition wall due to the attractive force can be prevented when the partition wall paste is contracted after firing.
As such, by preventing bending of the dummy partition wall and the looseness of the end of the partition wall, a gap does not occur between the partition wall and a front substrate, such that noise can be prevented from occurring.
While the invention has been described in connection with certain exemplary embodiments, it is to be understood by those skilled in the art that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications included within the spirit and scope of the appended claims and equivalents thereof.
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| 10-2005-0030666 | Apr 2005 | KR | national |
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