KR20080021943A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve a dark/bright contrast by coloring both a barrier rib and an address electrode in black. First and second substrates(10,20) are opposed to each other. A barrier rib(16) is arranged between the two substrates to define discharge cells. A fluorescent layer(19) is formed in the discharge cell. An address electrode(11) is elongated in a first direction on the first substrate corresponding to the discharge cells. First and second electrodes(31,32) are elongated in a second direction, which is normal to the first direction, corresponding to the discharge cells on the second substrate. Dielectric layers(13,21) are formed on the second substrate to bury the first and second electrodes. The barrier rib is colored in black. An exhaust path is formed between the discharge cells. The address electrode is colored in the same color as the barrier rib.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

FIG. 3 is a plan view illustrating an arrangement relationship between discharge cells and electrodes in FIG. 1.

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

5 is a cross-sectional view taken along the line VV of FIG. 4.

FIG. 6 is a plan view illustrating an arrangement relationship between discharge cells and electrodes in FIG. 4.

<Explanation of symbols for the main parts of the drawings>

10: first substrate (back substrate) 11: address electrode

13 and 21: first and second dielectric layers 16 and 26: partition walls

16a, 26a: 1st partition member 16b, 26b: 2nd partition member

116, 126: third partition member 126, 226: fourth partition member

326: bridge bulkhead 326a: home

17 discharge cell 19 phosphor layer

20: second substrate (front substrate) 23: protective film

31: first electrode (holding electrode) 32: second electrode (scanning electrode)

31a, 32a: transparent electrode 31b, 32b: bus electrode

DG: discharge gap W31, W32: width

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which improves bright room contrast while forming an exhaust passage in a colored partition.

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. The voltage becomes lower than the voltage Va, the discharge is weakened, and the address discharge is extinguished. At this time, a relatively small amount of electrons are accumulated in the sustain electrode, and a relatively large amount of ions are accumulated in the scan electrode. The charges accumulated on the sustain electrode and the dielectric layer covering the scan electrode are wall charged (Qw). The space voltage formed between the sustain electrode and the scan electrode by these wall charges is referred to as wall voltage (Vw).

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 vacuum ultraviolet light (VUV) generated at this time 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.

The plasma display panel driven as described above uses colored partitions to improve clear room contrast, and also has exhaust passages between discharge cells in order to improve exhaust performance during the manufacturing process.

Since the exhaust passage is formed in the space to be occupied by the partition, the area of the partition is narrowed by the area of the exhaust passage. Since the partition wall is colored, the clear room contrast is determined by the colored area. As the colored area becomes narrower, the clear room contrast decreases by the narrower area.

It is an object of the present invention to provide a plasma display panel which improves bright room contrast when applying colored partitions and exhaust passages.

According to an embodiment of the present invention, a plasma display panel includes: a first substrate and a second substrate disposed to face each other, a partition wall disposed between the two substrates to partition discharge cells, a phosphor layer formed in the discharge cells, An address electrode extending in a first direction corresponding to the discharge cells in the first substrate, and extending in a second direction crossing the first direction on the second substrate, respectively, and formed to correspond to the discharge cells A dielectric layer formed on the second substrate by filling a first electrode and a second electrode, and filling the first electrode and the second electrode, wherein the partition wall is colored black and has an exhaust passage between the discharge cells. The address electrode may be colored in a series of colored partition walls.

The dielectric layer may be colored blue. The partition wall may include one of chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), Cu (copper), and antimony (Sb).

In addition, the address electrode may include one of chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), Cu (copper), and antimony (Sb). The address electrode may include silver (Ag).

The exhaust passage may be formed in the second direction. The exhaust passage may have passage areas formed in the cross section cut in the first direction with the same size along the second direction.

The exhaust passage may have the smallest size in the center of the second direction of the discharge cell among the passage areas formed in the cross section cut in the first direction.

The address electrode may be colored in a portion facing the exhaust passage.

The partition wall extends in the second direction between the first partition wall members and the first partition wall members that extend in the first direction and are formed at intervals corresponding to the discharge cells along the second direction. Second partition walls may be formed at intervals corresponding to the discharge cells along a first direction.

The second partition member may include a third partition member and a fourth partition member that are separately formed between the discharge cells that are continuous in the first direction.

The second partition member may include a bridge partition formed in the first direction between the third partition member and the fourth partition member.

The bridge partition wall may be disposed at the center of the second direction of the discharge cell between the discharge cells neighboring in the first direction. The bridge partition wall may form a groove.

Each of the first electrode and the second electrode may include a bus electrode disposed at both sides of the first direction of the discharge cell and extending in the second direction, and a transparent electrode protruding from the bus electrode toward the center of the discharge cell. It may include.

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.

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

Referring to these drawings, the plasma display panel according to the first embodiment is disposed on the first substrate (hereinafter referred to as a "back substrate") 10 and the second substrate disposed to face each other at predetermined intervals. A substrate (hereinafter referred to as a "front substrate") 20 and a partition wall 16 provided between the substrates 10 and 20 are included. 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) and xenon (Xe)) so as to generate vacuum ultraviolet rays by gas discharge. The discharge cells 17 absorb the vacuum ultraviolet rays and display visible light. A phosphor layer 19 emitting light is provided.

The plasma display panel includes an address electrode 11 and a first electrode (hereinafter referred to as a “holding electrode”) corresponding to each discharge cell 17 between the rear substrate 10 and the front substrate 20 in order to realize 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 (the x-axis direction in the drawing) that crosses the y-axis direction.

The address electrodes 11 are covered with the first dielectric layer 13 covering 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 first partition members 16a extending in the y-axis direction and second partition members 16b extending in the x-axis direction between the first partition members 16a. In addition, the discharge cells 17 are formed in a matrix structure.

The phosphor layer 19 formed in each of the discharge cells 17 is coated with a phosphor paste on the side of the partition 16 and the surface of the first dielectric layer 13 positioned between the partitions 16. It is formed by drying and 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.

In addition, the sustain electrode 31 and the scan electrode 32 are provided on the inner surface of the front substrate 20 so that the surface discharge structure corresponds to each discharge cell 17 so as to cause gas discharge in the discharge cells 17. To form. Referring to FIG. 3, the sustain electrode 31 and the scan electrode 32 extend in the x-axis direction crossing the address electrode 11.

Each of the sustain electrode 31 and the scan electrode 32 includes 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 31 a and 32 a are portions which cause surface discharge inside the discharge cell 17 and are formed of a transparent material (for example, indium tin oxide (ITO)) to secure the aperture ratio of the discharge cell 17. 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 the voltage signal is applied to the bus electrodes 31b and 32b, the voltage signal is applied to each of the transparent electrodes 31a and 32a connected to the bus electrodes 31b and 32b.

Referring back to FIGS. 1 and 2, the sustain electrode 31 and the scan electrode 32 are covered with the second dielectric layer 21 while crossing the address electrodes 11 and facing each other corresponding to the discharge cells 17. Lose. 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, a reset discharge is generated by a reset pulse applied to the scan electrode 32 in the reset period, and the scan pulse and the address electrode 11 applied to the scan electrode 32 in the scan period following the reset period. The address discharge is caused by an address pulse applied to the? 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 sustain pulses required for sustain discharge, and the scan electrodes 32 serve as electrodes for applying reset pulses and scan pulses, and the address electrodes. Reference numeral 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.

On the other hand, the plasma display panel of the first embodiment is formed so as to improve bright room contrast and exhaust performance together using coloring. In the sustain discharge, the partition wall 16 is colored in order to improve the black ratio of the plasma display panel while minimizing the blocking of the visible light emitted from the discharge cells 17. Here, the black part ratio means the ratio of the area occupied by black to the unit area. The higher the black fraction, the greater the absorption of external light to improve the clear room contrast.

To this end, the partition wall 16 is colored with a black color. When colored black, since the absorption amount of visible light in the partition 16 is increased, the partition 16 may be colored brown.

When the partition wall 16 is colored brown, the second dielectric layer 21 is colored blue based so as to be black when viewed from the front surface of the front substrate 20. That is, black is implemented on the front substrate 20 that receives external light by the brown of the partition 16 and the blue of the second dielectric layer 21. In addition, the partition 16 may be colored black and the front substrate 20 may be colored blue.

The black colored partition 16 includes at least one of materials such as chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), copper (copper) and antimony (Sb). do.

In addition, the partition wall 16 forms an exhaust passage 18 between the discharge cells 17 to improve the exhaust performance between the discharge cells 17. The exhaust passage 18 seals both substrates 10 and 20 during the manufacture of the plasma display panel, and then provides a passage when exhausting residual gas and filling discharge gas.

The exhaust passage 18 may be formed (not shown) in the y-axis direction and the x-axis direction. However, in the first embodiment, the exhaust passage 18 may minimize the area reduction of the discharge cells 17 irradiating visible light. Is formed.

The exhaust passage 18 forms a predetermined passage area in the cross section (see Fig. 2) cut in the y-axis direction, and the passage area is formed in the same size along the x-axis direction. The passage area of the exhaust passage 18 is defined by the partition 16, the first dielectric layer 13, and the protective film 23.

In order to describe the exhaust passage 18 in more detail, the partition wall 16 will be described in detail. The second partition wall member 16b is separated between the discharge cells 17 continuous in the y-axis direction and arranged side by side. The third partition member 116 and the fourth partition member 216 are formed.

Accordingly, the exhaust passage 18 is formed between the third partition member 116 and the fourth partition member 216. In addition, as the third partition member 116 and the fourth partition member 216 extend in the x-axis direction, the exhaust passage 18 has a uniform passage area and is formed long in the x-axis direction.

As such, the exhaust passage 18 having a uniform passage area along the x-axis direction can further improve the exhaust performance.

On the other hand, if the area occupied by the discharge cells 17 per unit area is the same, the area occupied by the colored partition wall 16 as the exhaust passage 18 is formed (more specifically, the area occupied by the second partition member 16b). This is reduced. In order to compensate for the black area according to the reduction of the area of the second partition member 16b, the colored address electrode 11 is illustrated in the first embodiment.

Since the address electrode 11 forms a black portion at the portion where the partition wall 16 is not formed, the address electrode 11 is colored in the same color as that of the colored partition wall 16. That is, the address electrode 11 is colored black or brown.

The black colored address electrode 11 is formed of at least one of materials such as chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), copper (copper), and antimony (Sb). Include. The address electrode 11 that is colored to form a black portion is formed of silver (Ag) having excellent conductance.

The address electrode 11 complements the colored area of the partition wall 16 reduced by the exhaust path 18 and thus corresponds to the exhaust path 18 between the third partition member 116 and the fourth partition member 216. It can be colored only to the part which does.

When the address electrode 11 is partially colored as described above, the amount of visible light that can be absorbed from the back substrate 10 side of the discharge cell 17 can be minimized as compared with the case where the address electrode 11 is partially colored.

In addition, the address electrode 11 may be formed as large as possible within the allowable consumption range of the address current in order to maximize the black portion in the exhaust passage 18. For this purpose, the address electrode 11 is formed to protrude in the x-axis direction from the exhaust passage 18 and may be colored even in this protruding portion (not shown).

The colored address electrode 11 complements the black portion reduced due to the exhaust passage 18 to improve the contrast PP room contrast in the plasma display panel forming the colored partition 16 and the exhaust passage 18. have.

4, 5 and 6 show a second embodiment different from the first embodiment. In the overall configuration, since the second embodiment is similar to or identical to the first embodiment, only the other parts of the second embodiment will be described here compared with the first embodiment.

First, as in the first embodiment, the partition wall 26 of the second embodiment is formed of the first partition member 26a and the second partition member 26b, and the second partition member 26b is the third partition member. 126 and the fourth partition member 226.

In the second embodiment, the exhaust passage 28 is formed with the smallest size in the center of the x-axis direction of the discharge cell 17 among the passage area areas formed in the cross section cut in the y-axis direction (see FIG. 5).

To this end, the second partition member 26b further includes a bridge partition 326 formed in the y-axis direction between the third partition member 126 and the fourth partition member 226. The bridge partition wall 326 connects the third partition wall member 126 and the fourth partition wall member 226 in the center of the x-axis direction of the discharge cell 17 between the discharge cells 17 adjacent to each other in the y-axis direction.

The bridge partition wall 326 forms a groove 326a. The groove 326a is formed in the bridge partition wall 326 facing the protective film 23 to form the smallest size of the passage area.

The second embodiment includes the bridge partition wall 326, so that the black area by the partition wall 26 is wider than the partition wall 16 of the first embodiment. However, compared with the first embodiment, the bridge partition wall 326 inhibits the exhaust performance in the x-axis direction. Therefore, the groove 326a formed in the bridge partition wall 326 may add the exhaust performance by connecting the exhaust passage 28 in the x-axis direction.

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, the partition wall is colored in black and the exhaust electrode is formed between the discharge cells. There is an effect of simultaneously realizing the bright room contrast improvement by coloring the address electrode.

Claims (15)

A first substrate and a second substrate spaced apart from each other; Barrier ribs disposed between the substrates to partition discharge cells; A phosphor layer formed in the discharge cell; An address electrode extending from the first substrate in a first direction corresponding to the discharge cells; First and second electrodes respectively extending in a second direction crossing the first direction on the second substrate and formed to correspond to the discharge cells; And A dielectric layer formed on the second substrate by filling the first electrode and the second electrode; The partition wall is colored black and forms an exhaust passage between the discharge cells, And the address electrode is colored in a series of colored partition walls. According to claim 1, And the dielectric layer is colored blue. The method of claim 2, The partition wall includes one of chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), Cu (copper), and antimony (Sb). The method of claim 2, The address electrode includes one of chromium (Cr), cobalt (Co), Mn (manganese), ruthenia (Ru), Cu (copper), and antimony (Sb). According to claim 1, And the address electrode includes silver (Ag). The method of claim 2, And the exhaust passage is formed in the second direction. The method of claim 6, And wherein the exhaust passage has passage areas formed in the cross section cut in the first direction having the same size along the second direction. The method of claim 6, And the exhaust passage is formed to have the smallest size in the center of the second direction of the discharge cell among the passage areas formed in the cross section cut in the first direction. According to claim 1, And the address electrode is colored in a portion facing the exhaust passage. According to claim 1, The partition wall, First barrier members extending in the first direction and formed at intervals corresponding to the discharge cells along the second direction; And second partition members extending in the second direction between the first partition members and formed at intervals corresponding to the discharge cells along the first direction. The method of claim 10, The second partition member includes a third partition member and a fourth partition member that are separately formed between the discharge cells continuous in the first direction. The method of claim 11, wherein The second partition member, And a bridge barrier rib formed in the first direction between the third barrier member and the fourth barrier member. The method of claim 12, The bridge partition wall is disposed in the center of the second direction of the discharge cell between the discharge cells neighboring in the first direction. The method of claim 13, And the bridge partition wall forms a groove. According to claim 1, Each of the first electrode and the second electrode, Bus electrodes disposed on both sides of the first direction of the discharge cell and extending in the second direction; And a transparent electrode protruding from the bus electrode toward the center of the discharge cell.

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