KR20080084353A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve a bright spot by preventing a breakdown and scattering of phosphor on a lateral surface of a longitudinal barrier rib member. A rear substrate and a front substrate are disposed opposite to each other. A barrier rib(16) is formed to define discharge cells between the front and rear substrates. The barrier rib includes longitudinal barrier rib members(16a) extended in a first direction and arranged along a second direction crossing the first direction and lateral barrier rib members(16b) extended in the second direction between the longitudinal barrier rib members and arranged at a predetermined interval along the first direction. Phosphor(19) is formed in the inside of the discharge cells. A plurality of address electrodes are arranged between the longitudinal barrier rib members and are extended in the first direction. A dielectric layer is formed to cover the first and second electrodes. A convex part(116a) is protruded from a center part of the discharge cell. The lateral barrier rib member includes a protrusive part corresponding to the height of the convex part.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG.

FIG. 4 is a plan view showing an arrangement relationship between the discharge cells and the electrodes of FIG.

5 is a partial perspective view showing in detail a partition and a phosphor layer forming a discharge cell.

<Explanation of symbols for main parts of the drawings>

10: back substrate 11: address electrode

13: first dielectric layer 16: bulkhead

16a: vertical partition member 16b: horizontal partition member

17: discharge cell 19: phosphor layer

116b: protrusion 116a: ridge

H116a, H116b: Height W16b, W116b: Width

20: front substrate 21: second dielectric layer

23: protective film 31: first electrode (holding electrode)

32: second electrode (scanning electrode) 31a, 32a: transparent electrode

31b and 32b: bus electrode 119: phosphor portion

The present invention relates to a plasma display panel, and more particularly, to prevent collision between a dielectric layer of a front substrate and a vertical bulkhead member bulge, thereby preventing breakage and scattering of phosphors formed on the side of the vertical bulkhead member by a dispenser to improve bright spots. The present invention relates to a plasma display panel.

In general, a plasma display panel is a visible light of red (R), green (G) and blue (B) generated by exciting the phosphor using a vacuum ultra-violet (VUV) emitted from the plasma obtained through gas discharge It is a display device for implementing an image.

As an example, an AC plasma display panel forms address electrodes on a back substrate and covers the address electrodes with a dielectric layer. The partition walls are disposed between the address electrodes on the dielectric layer to form a stripe shape, and phosphor layers of red (R), green (G), and blue (B) layers are formed on the partition walls. On the front substrate facing the rear substrate, display electrodes composed of a pair of sustain electrodes and scan electrodes are formed along the direction crossing the address electrodes, and a dielectric layer and an MgO protective film cover the display electrodes. The discharge cell is formed at the point where the pair of address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. In the plasma display panel, millions of unit discharge cells are arranged in a matrix form.

The memory characteristic is used to drive the discharge cells of the plasma display panel. In more detail, in order to generate a discharge between the sustain electrode and the scan electrode constituting the pair of display electrodes, a potential difference of more than a specific voltage is required, and the voltage at this boundary is called a firing voltage (Vf). When the scan voltage and the address voltage are respectively applied to the scan electrode and the address electrode, the discharge is started to form a plasma in the discharge cell, and the electrons and ions of the plasma move toward the electrodes having opposite polarities.

On the other hand, a dielectric layer is applied to each electrode of the plasma display panel, so that most of the moved space charges are stacked on the dielectric layer having opposite polarity, so that the net space potential between the scan electrode and the address electrode is originally applied to the address. It becomes lower than the voltage Va. Therefore, the address discharge weakens and disappears. At this time, a relatively small amount of electrons are accumulated on the sustain electrode, and a relatively large amount of ions are accumulated on the scan electrode. The charges accumulated on the dielectric layers covering the sustain electrodes and the scan electrodes are called wall charges (Qw), and the space voltages formed between the sustain electrodes and the scan electrodes by the wall charges are wall voltages (Vw). It is called.

Subsequently, when the discharge sustain voltage Vs is applied to the sustain electrode and the scan electrode, the sum of the magnitudes of the discharge sustain voltage Vs and the wall voltage Vw (Vs + Vw) is the discharge start voltage Vf. If higher, sustain discharge occurs in the discharge cell. The generated vacuum ultraviolet ray (VUV) excites the phosphor and emits visible light through the transparent front substrate.

However, when there is no address discharge between the scan electrode and the address electrode (that is, when the address voltage Va is not applied), wall charges do not accumulate between the sustain electrode and the scan electrode, and consequently, the sustain electrode and the scan electrode. There is no wall voltage in between. At this time, only the discharge sustain voltage Vs applied to the sustain electrode and the scan electrode is formed in the discharge cell. Since the discharge sustain voltage is lower than the discharge start voltage Vf, the gas space between the sustain electrode and the scan electrode cannot be discharged.

On the other hand, the partition wall has a stripe shape as described above, as well as a matrix shape including a vertical partition member and a horizontal partition member. The matrix-shaped partition wall forms discharge cells in an independent structure to effectively prevent crosstalk.

A dispenser method is used to form a phosphor in a discharge cell partitioned by a vertical partition member and a horizontal partition member. In other words, this dispenser method applies the phosphor continuously while moving the dispenser in the direction of the vertical bulkhead member. Therefore, the phosphor layer is formed on the inside of the discharge cell and on the side of the ridge of the vertical partition member.

When the front substrate and the back substrate are sealed to each other, the phosphor layer and the vertical partition member formed on the ridge side of the vertical partition member among the phosphor layers collide with the dielectric layer and the MgO protective layer formed on the front substrate.

At this time, the crack of the ridge of the vertical partition member and the phosphor particles broken out from the phosphor layer on the side of the ridge are scattered in the discharge cell and attached around the sustain electrode or the scan electrode, so that the light is particularly strong than other parts of the discharge cell. It generates a point, that is, a bright point.

Therefore, the present invention is to solve the above problems, an object of the present invention is to prevent the collision between the dielectric layer of the front substrate and the vertical partition member, the crack and scattering of the phosphor formed on the side of the ridge of the vertical partition member by the dispenser It is to provide a plasma display panel to prevent the light point to improve.

According to an embodiment of the present invention, a plasma display panel may include a rear substrate, a front substrate, and a discharge cell that are spaced apart from each other so as to partition discharge cells between the substrates and extend in a first direction and cross the first direction. The partition wall including the vertical partition members disposed at predetermined intervals in two directions and the horizontal partition members extending in the second direction and disposed at predetermined intervals in the first direction between the vertical partition members and the discharge cell; Address electrodes extending in the first direction and respectively disposed between the phosphor layers formed therebetween and adjacent vertical partition members, respectively, extending in the second direction and corresponding to the discharge cells on the front substrate. And a dielectric layer covering the first electrode and the second electrode and the first electrode and the second electrode, wherein the vertical partition wall member comprises: It includes a ridge convexly raised on the central side of the discharge cell, the horizontal partition wall member may include a protrusion corresponding to the ridge height of the ridge.

The ridge may have a maximum height at a central portion thereof in the longitudinal direction of the vertical partition member.

The protrusion may have a height greater than or equal to the maximum height of the ridge. The protrusion may have a width narrower than the width of the horizontal partition member in the first direction.

The protrusion may be elongated along the second direction on the horizontal partition wall member.

The first electrode and the second electrode may each include a bus electrode formed on the front substrate facing the horizontal partition wall member, and a transparent electrode protruding from the bus electrode toward the center of the discharge cell.

The barrier rib may be colored brown, and the dielectric layer of the front substrate may be colored blue.

In addition, the plasma display panel according to an embodiment of the present invention, the rear substrate and the front substrate which are disposed to face each other, the partition wall partitioning the discharge cell between the both substrates, the phosphor layer formed inside the discharge cell, the An address electrode extending in a first direction corresponding to a discharge cell, a first electrode and a second electrode formed on the front substrate corresponding to the discharge cells, respectively, extending in a second direction crossing the first direction; A dielectric layer covering the first electrode and the second electrode, wherein the barrier rib includes a ridge formed on the barrier rib in one of the first direction and the second direction, and the ridge is formed. It may include a protrusion formed on the partition wall in a direction different from the direction corresponding to the raised height of the ridge.

The ridge may have a maximum height at the center portion on the partition wall, and the protrusion may have a height above the maximum height of the connection portion.

The protrusion may have a width narrower than the width of the partition wall and may be formed to be long along the partition wall.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a perspective view schematically illustrating an exploded view of a plasma display panel according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a line III-III of FIG. The cross section is cut along the side.

Referring to these drawings, a plasma display panel according to an embodiment is disposed on the back substrate 10 and the front substrate 20 which are disposed to face each other at predetermined intervals, and the substrates 10 and 20. The partition 16 is provided in between.

The partition wall 16 is formed at a predetermined height between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 17.

The discharge cells 17 are filled with a discharge gas (for example, a mixed gas including neon (Ne), xenon (Xe), etc.) so as to generate a vacuum ultraviolet ray by gas discharge, and absorbs the vacuum ultraviolet ray A phosphor layer 19 for emitting visible light is provided.

The plasma display panel includes an address electrode 11 and a first electrode corresponding to each discharge cell 17 between the rear substrate 10 and the front substrate 20 to implement an image by gas discharge. 31 and a second electrode (hereinafter referred to as "scan electrode") 32 are provided.

As an example, the address electrode 11 is formed along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 to form discharge cells 17 adjacent to the y-axis direction. Corresponds continuously. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to the discharge cells 17 adjacent to each other in a second direction crossing the y-axis direction (the x-axis direction of the drawing).

The address electrodes 11 are covered with the first dielectric layer 13 formed on the inner surface of the back substrate 10 as described above. The first dielectric layer 13 prevents cations or electrons from directly colliding with the address electrode 11 during discharge, thereby preventing damage to the address electrode 11, and also forms and accumulates wall charges.

Since the address electrode 11 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 11 may be formed as an opaque electrode. That is, the address electrode 11 may be formed of a metal electrode having excellent conductance.

The partition 16 is actually provided on the first dielectric layer 13 to partition the discharge cells 17. The partition 16 includes vertical partition members 16a extending in the y-axis direction and horizontal partition members 16b extending in the x-axis direction between the vertical partition members 16a. The discharge cells 17 are formed in a matrix structure.

When the partition wall 16 is formed of the vertical partition members 16a and the horizontal partition members 16b as described above, the address electrode 11 is disposed between the adjacent vertical partition members 16a.

The phosphor layer 19 formed in each of the discharge cells 17 is dried by applying a phosphor paste on the side of the partition wall 16 and the surface of the first dielectric layer 13 positioned between the partition walls 16. And by firing.

The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 17 formed along the y-axis direction. In addition, the phosphor layer 19 is repeatedly formed by the phosphors of red (R), green (G), and blue (B) in the discharge cells 17 repeatedly arranged along the x-axis direction.

On the other hand, the sustain electrode 31 and the scanning electrode 32 are provided on the inner surface of the front substrate 20, the surface discharge structure corresponding to each discharge cell 17 to cause gas discharge in the discharge cells 17 To form.

Referring to FIG. 4, the sustain electrode 31 and the scan electrode 32 are elongated along the x-axis direction crossing the address electrodes 11.

The sustain electrode 31 and the scan electrode 32 each include transparent electrodes 31a and 32a for generating a discharge and bus electrodes 31b and 32b for applying a voltage signal to the transparent electrodes 31a and 32a, respectively. Is formed.

The transparent electrodes 31a and 32a are surface discharges in the discharge cells 17 and are formed of a transparent material (for example, indium tin oxide (ITO)) to secure the aperture ratio of the discharge cells 17.

In addition, the bus electrodes 31b and 32b are formed of a metal material having excellent electrical conductivity to compensate for the high electrical resistance of the transparent electrodes 31a and 32a.

The transparent electrodes 31a and 32a form surface discharge structures with each of the widths W31 and W32 from the outer edge of the discharge cell 17 along the y-axis direction, and form a center portion of each discharge cell 17. Discharge gap DG is formed.

The bus electrodes 31b and 32b are disposed on the transparent electrodes 31a and 32a, respectively, and extend in the x-axis direction at the outside of the discharge cell 17. Therefore, when a voltage signal is applied to each of the bus electrodes 31b and 32b, a voltage signal is applied to the transparent electrodes 31a and 32a connected to each of the bus electrodes 31b and 32b.

More specifically, the bus electrodes 31b and 32b are formed on the front substrate 20 at a position corresponding to the horizontal partition member 16b (see FIG. 2). Therefore, although the bus electrodes 31b and 32b are made of an opaque material, the bus electrodes 31b and 32b may avoid or minimize the blocking of visible light irradiated forward from the discharge cell 17.

Referring back to FIGS. 1, 2, and 3, the sustain electrode 31 and the scan electrode 32 cross the address electrodes 11 to face each other in correspondence with the discharge cells 17, and thus the second dielectric layer 21. Covered with)

The second dielectric layer 21 forms and accumulates wall charges during discharge while protecting the sustain electrode 31 and the scan electrode 32 from gas discharge.

The second dielectric layer 21 is covered with the protective film 23. For example, the protective film 23 is formed of transparent MgO that protects the second dielectric layer 21, thereby increasing the secondary electron emission coefficient upon discharge.

During the plasma display panel driving, reset discharge is caused by a reset pulse applied to the scan electrode 32 in the reset period. In the addressing period following this reset period, an address discharge is caused by a scan pulse applied to the scan electrode 32 and an address pulse applied to the address electrode 11. Thereafter, in the sustain period, sustain discharge is caused by a sustain pulse applied to the sustain electrode 31 and the scan electrode 32.

The sustain electrode 31 and the scan electrode 32 serve as electrodes for applying a sustain pulse required for sustain discharge. The scan electrode 32 serves as an electrode for applying a reset pulse and a scan pulse. The address electrode 11 serves as an electrode for applying an address pulse. The sustain electrode 31, the scan electrode 32, and the address electrode 11 may have different roles depending on the voltage waveforms applied to the sustain electrodes 31, the scan electrodes 32, and the address electrodes 11, respectively.

The plasma display panel selects a discharge cell 17 to be turned on by the address discharge due to the interaction between the address electrode 11 and the scan electrode 32, and the interaction between the sustain electrode 31 and the scan electrode 32. The selected discharge cell 17 is driven by sustain discharge, thereby realizing an image.

Meanwhile, in order to form the plasma display panel of the present embodiment, when the second dielectric layer 21 and the front substrate 20 having the protective film 23 and the back substrate 10 having the partition wall 16 are sealed to each other. The second dielectric layer 21 and the passivation layer 23 are in close contact with the partition 16.

In addition, the partition wall 16 is formed to include the vertical partition members 16a and the horizontal partition members 16b as described above. In the discharge cell 17, the longitudinal length is longer than the horizontal length. Accordingly, when the partition 16 is fired, the vertical partition member 16a has a raised portion 116a which is convexly raised toward the front substrate 20 in correspondence with the center portion of the discharge cell 17.

In addition, a method of applying the phosphor layer 19 to the discharge cells 17 includes a dispenser method using a dispenser (not shown). This dispenser method applies a phosphor paste while moving the dispenser in the y-axis direction between the vertical partition members 16a.

Therefore, the phosphor paste is partially applied to the side of the ridge portion 116a of the vertical partition wall member 16a that partitions the discharge cells 17 adjacent to each other in the discharge cell 17 and along the x-axis direction.

Thus, the phosphor layer 19 is formed inside the discharge cell 17. In addition, the phosphor layer 19 further includes a portion 119 formed on the side of the raised portion 116a of the vertical partition member 16a that partitions the discharge cells 17 in the x-axis direction (a dashed line in FIG. 5). To the city).

The ridge 116a is formed of a partition material on the vertical partition member 16a, and the portion 119 is formed of a phosphor. The ridge 116a has a predetermined height H116a on the vertical partition wall member 16a. This height H116a means the highest height of the ridge 116a which has meaning with respect to a bright point in the ridge 116a.

The ridge 116a is formed in a curved surface which forms different heights along the longitudinal direction of the vertical partition member 16a (refer FIG. 2). Therefore, the height H116a of the raised portion 116a means the height of the longitudinal direction of the vertical partition member 16a, that is, the height of the center portion of the discharge cell 17 in the y-axis direction.

In addition, the horizontal partition wall member 16b includes a protrusion 116b having a height H116b corresponding to the protrusion height H116a of the ridge 116a.

The protrusion 116b has a height H116b equal to or higher than the maximum height H116a of the ridge 116a. Therefore, when the front substrate 20 and the rear substrate 10 are sealed, the portion of the partition wall 16 that is in close contact with the second dielectric layer 21 and the passivation layer 23 of the front substrate 20 is a protrusion of the horizontal partition member 16b. (116b).

Therefore, the ridge 116a of the vertical partition member 16a and the portion 119 formed of phosphor on the side surface thereof do not strike the second dielectric layer 21 and the protective film 23. That is, the bulge portion 116a of the vertical partition member 16a and the phosphor portion 119 formed on the side surface of the vertical partition wall member 16a, despite the sealing of the two substrates 10 and 20, pressurize the pressure from the second dielectric layer 21 and the protective film 23. It will not be received.

As a result, the bulge portion 116a and the phosphor portion 119 of the vertical partition wall member 16a are not broken and no phosphor which is scattered can be found. As such, since there is no phosphor scattering in the discharge cell 17, bright spots generated by being attached to other parts of the discharge cell 17 may be improved.

Further, the protrusion 116b has a width W116b narrower than its width W16b on the horizontal partition member 16b and is formed long in the x-axis direction. As a result, the protrusions 116b are spaced apart from each other in the y-axis direction while generating discharge cells 17 that generate visible light of different colors.

The protrusion 116b of the horizontal partition member 16b is formed between the discharge cells 17 adjacent in the y-axis direction even when the phosphor portion 119 is formed in the raised portion 116a of the vertical partition member 16a. Crosstalk can be effectively prevented.

In addition, the protrusion may have the same width as that of the horizontal partition member, and may be formed intermittently along the x-axis direction (not shown). In this case, the horizontal partition member has a height higher than that of the vertical partition member.

That is, the protrusion 116b of the horizontal partition member 16b has a width W116b and a length in the x-axis direction, and may have various shapes according to the width W116b and the length in the x-axis direction.

Although the ridge 116a is formed on the vertical partition member 16a with a predetermined height H116a, the ridge 116a and the phosphor portion 119 formed thereon are formed of the second dielectric layer 21 and the protective film 23. It is necessary to maintain the sealing structure stably the front substrate 20 and the back substrate 10 do not hit).

To this end, in the protrusion 116b, an increase in the width W116b makes it possible to reduce the length in the x-axis direction, and an increase in the length in the x-axis direction makes it possible to reduce the width W116b.

Therefore, when the protrusion 116b is formed long in the x-axis direction in the entire range on the horizontal partition member 16b, the crosstalk is prevented between the discharge cells 17 neighboring in the y-axis direction as compared with the case where the protrusion 116b is formed intermittently. It is advantageous to When the protrusion 116b is formed wide along the y-axis direction, it is advantageous to form a stable support structure of the partition wall 16 as compared with the narrow width.

In addition, the plasma display panel may color the partition wall 16 in brown and the second dielectric layer 21 in blue in order to improve bright room contrast.

At this time, a black portion is formed by subtraction mixing of brown and blue at the portion where the partition wall 16 and the second dielectric layer 21 overlap each other. In other words, the black portion has a pattern corresponding to the partition wall 16 and absorbs external light without disturbing forward irradiation of visible light.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display panel according to the present invention, a ridge is formed on the vertical partition member, and a protrusion is formed on the horizontal partition member in accordance with the bulge degree of the ridge to form a dielectric layer and a protective film on the front substrate. By supporting the protrusions of the horizontal partition member, there is an effect of preventing a collision between the dielectric layer and the protective film of the front substrate and the vertical partition member. This prevents cracking and scattering of the phosphor on the side of the vertical partition member, thereby improving the bright spot. In addition, when the ridge is raised on the vertical partition member, as the projection is formed on the horizontal partition member, the projection prevents crosstalk.

Claims (10)

A rear substrate and a front substrate spaced apart from each other; The second direction between the vertical partition wall members and the vertical partition wall members, the discharge cells are divided between the two substrates, and are disposed at predetermined intervals in a second direction extending in a first direction and crossing the first direction. Partition walls including horizontal partition members extending in a predetermined interval along the first direction; A phosphor layer formed inside the discharge cell; Address electrodes disposed between the adjacent vertical partition members and extending in the first direction; First and second electrodes respectively extending in the second direction and formed on the front substrate to correspond to the discharge cells; And A dielectric layer covering the first electrode and the second electrode, The vertical partition wall member includes a ridge convexly raised at the center side of the discharge cell, The horizontal partition wall member includes a protrusion corresponding to the height of the ridge of the ridge. According to claim 1, And the raised portion has the highest height at a central portion thereof in the longitudinal direction of the vertical partition wall member. The method of claim 2, And the protrusion has a height greater than or equal to a maximum height of the ridge. According to claim 1, The protrusion has a width narrower than the width of the horizontal partition member in the first direction. The method of claim 4, wherein And the protrusion is formed to extend in the second direction on the horizontal partition member. According to claim 1, The first electrode and the second electrode, A bus electrode formed on the front substrate facing the horizontal partition member, respectively; And a transparent electrode protruding from the bus electrode toward the center of the discharge cell. According to claim 1, The bulkhead is colored brown; And the dielectric layer of the front substrate is colored blue. A rear substrate and a front substrate spaced apart from each other; Barrier ribs partitioning discharge cells between the substrates; A phosphor layer formed inside the discharge cell; An address electrode extending in a first direction corresponding to the discharge cell; First and second electrodes each extending in a second direction crossing the first direction and formed on the front substrate to correspond to the discharge cells; And A dielectric layer covering the first electrode and the second electrode, The partition wall, A ridge formed on the partition wall in any one direction among the first and second directions, And a protrusion formed on the partition wall in a direction different from the direction in which the ridge is formed to correspond to the ridge height of the ridge. The method of claim 8, The ridge has the highest height at the center on the partition, And the protrusion has a height greater than or equal to a maximum height of the connection portion. The method of claim 9, And the protrusion has a width narrower than the width of the barrier rib and is formed along the barrier rib.

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