KR100805106B1 - Plasma display panel - Google Patents

Abstract

In the plasma display panel according to the present invention, the unit light is reduced to improve low gray scale expressing ability, and the cell is disposed between the first substrate and the second substrate, and the first substrate and the second substrate are disposed to face each other. Barrier ribs that partition the sidewalls, address electrodes formed along a first direction between the second substrate and the first substrate, and formed along a second direction electrically spaced apart from the address electrodes and crossing the first direction Display electrodes, a phosphor layer formed on the cell, and a dielectric layer covering the display electrode, wherein the cells may be formed of red, green, blue cells, and blank cells.

Plasma, address electrode, blank cell, barrier rib, dielectric layer

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view showing a plasma display panel according to a first embodiment of the present invention.

2 is a plan view partially showing a cell and an electrode arrangement of a plasma display panel according to a first embodiment of the present invention.

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

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

5 is a plan view partially showing a cell and an electrode arrangement of a plasma display panel according to a second embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a blank cell to improve low gray scale display ability.

In general, a plasma display panel ("PDP") displays an image using a gas discharge phenomenon and has excellent display capability such as display capacity, brightness, contrast, afterimage, viewing angle, and the like.

Taking the three-electrode surface discharge structure as an example, the plasma display panel seals the discharge cell by the partition wall by sealing the front substrate including the sustain electrode and the scan electrode and the rear substrate including the address electrode with the partition wall therebetween. A compartment is formed and filled with an inert gas (for example, a mixed gas of neon (Ne) and xenon (Xe)) in the discharge cell.

In the plasma display panel, when an address voltage is applied to the address electrode and a scan pulse is applied to the scan electrode, a wall charge is formed between the two electrodes to select a discharge cell to be turned on by the address discharge. When the pulse is applied, electrons and ions formed in the sustain electrode and the scan electrode are moved between the sustain electrode and the scan electrode, and the discharge start voltage is exceeded in addition to the wall voltage caused by the wall charge formed during the address discharge. Causes

The vacuum ultraviolet rays generated in the discharge cells by this sustain discharge excite the phosphor, and the phosphor is stabilized to generate visible light to implement an image on the plasma display panel.

These discharge cells are provided with one of red (R), green (G), and blue (B) phosphors to form subpixels for generating visible light of one of red, green, and blue colors, respectively. One set of subpixels, that is, one pixel, is formed of one subpixel each of a red discharge cell, a green discharge cell, and a blue discharge cell.

Since the plasma display panel increases the unit light by generating visible light in almost all regions except for the partition wall forming the discharge cell, the low gray scale display ability is low.

The present invention was devised to solve the above problems, and an object thereof is to provide a plasma display panel which reduces unit light and improves low gradation expression.

In an embodiment, a plasma display panel includes a first substrate and a second substrate facing each other, partition walls disposed between the first substrate and the second substrate to partition subcells, and the second substrate. Address electrodes formed along a first direction between the first substrate and the first substrate, display electrodes formed along a second direction electrically spaced apart from the address electrodes and crossing the first direction, and formed in the cell A phosphor layer and a dielectric layer covering the display electrode, wherein the cells may be formed of red, green, blue cells, and blank cells.

The dielectric layer may be formed in blue, and the partitions may be formed in brown.

The red, green, blue cells and the blank cells may be sequentially disposed along the second direction.

The blank cell may be partitioned into a pair of neighboring partitions between the dielectric layer formed on the first substrate and the dielectric layer covering the display electrode.

The barrier ribs may include first barrier members extending along the first direction and disposed parallel to each other along the second direction to partition cells along the second direction.

The partition wall may include second partition wall members extending in the second direction between the first partition member to partition cells along the first direction.

In addition, the red, green, and blue cells may be partitioned into the first partition members and the second partition members, and the blank cell may be partitioned into the first partition members.

The display electrode may include a protruding electrode protruding toward the center of the cell and a bus electrode connecting the protruding electrode along the second direction, and the protruding electrode may be provided only in the red, green, and blue cells.

The address electrode may be provided only in the red, green, and blue cells.

The phosphor layer may be provided only in the red, green, and blue cells.

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 partially exploded perspective view showing a plasma display panel according to a first embodiment of the present invention.

As shown, the plasma display panel according to the first exemplary embodiment basically forms a set of pixels in which red, green, and blue cells and blank cells are arranged in one direction.

Here, the red, green, and blue cells are driven to implement an image, and the remaining blank cells are not driven to not implement an image.

In more detail, the plasma display panel includes a first substrate 10 (hereinafter referred to as a "back substrate") and a second substrate 30 (hereinafter referred to as "substrate") encapsulated while being disposed substantially parallel to each other at random intervals therebetween. Front substrate ".

A partition wall 23 is formed between the rear substrate 10 and the front substrate 30 to partition the pixels 120 while having a predetermined height and having a predetermined pattern. In one example, the partition 23 is formed of first partition members extending in a first direction (y-axis direction in the drawing).

Referring to FIG. 2, a set of pixels 120 includes three red, green, and blue cells 120R, 120G, and 120B and a blank cell 120BL arranged in one direction as described above.

In this case, each of the four cells 120R, 120G, 120B, and 120BL is connected to the first direction y by the partition walls 23 and crosses the first direction y in the second direction (the x-axis of the drawing). Direction) are partitioned from each other.

In the first embodiment, the planar shape of each of the cells 120R, 120G, 120B, and 120BL has a stripe shape in which both sides of the first direction y are open. Here, the red, green, and blue cells 120R, 120G, and 120B form discharge cells in which discharge occurs, and the blank cells 120BL form non-discharge cells in which discharge does not occur.

This non-discharge cell may be implemented not having one of the various components constituting the discharge cell at least involved in address discharge or sustain discharge. In the following description of each component it will be described that the corresponding components may not be provided.

In the discharge cells, the red, green, and blue cells 120R, 120G, and 120B and the non-discharge cells, the blank cells 120BL are filled with a discharge gas including xenon and neon, which are required for plasma gas discharge. do. In the blank cell 120BL, which is a non-discharge cell, gas discharge does not occur, but the same vacuum pressure as other red, green, and blue cells 120R, 120G, and 120B, which are other discharge cells, is maintained.

Referring to FIG. 3, red, green, and blue phosphor layers 25R, 25G, and 25B corresponding to the red, green, and blue cells 120R, 120G, and 120B are formed, respectively, and the blank cells 120BL have a corresponding phosphor layer. Correspondingly, no phosphor layer is provided.

The blank cell 120BL is formed to be elongated in the first direction y to be disposed adjacent to the green and red cells 120B and 120R in the second direction x so as not to be driven. The discharge heat from the 120B and 120R may be absorbed and transferred to the back substrate 10 and the front substrate 30.

In addition, since the blank cell 120BL does not generate visible light, it is possible to effectively form a complementary color relationship between the rear substrate 10 side and the front substrate 30 side.

The address electrodes 15 are formed on the rear substrate 10 along the first direction y, and are arranged side by side along the second direction x. The address electrodes 15 are disposed to pass below each cell (between the back substrate and the partition wall).

In this case, the address electrode 15 may be provided in the red, green, and blue cells 120R, 120G, and 120B, which are discharge cells, and may not be provided in the blank cell 120BL, which is a non-discharge cell. As such, since the blank electrode 120BL is not provided with an address electrode, address discharge cannot occur, and image realization due to sustain discharge cannot occur.

The address electrodes 15 are covered with the first dielectric layer 12. Since the first dielectric layer 12 is formed on the front surface of the rear substrate 10, the first dielectric layer 12 is disposed under the partition walls 23. In the process, the first dielectric layer 12 may be formed on the entire back substrate 10 without distinguishing the red, green, and blue cells 120R, 120G, and 120B and the blank cell 120BL.

Therefore, the phosphor layer 25 formed in the red, green, and blue cells 120R, 120G, and 120B, respectively, is formed on the side of the partition 23 and the first dielectric layer 12 that substantially divide the cells.

At this time, the phosphor layer is not formed in the non-discharge cell. Since the blank cell 120BL does not have a phosphor layer, it is impossible to emit visible light of any color. In addition, the blank cell 120BL may not emit visible light even when sustain discharge occurs due to abnormal reasons such as cross talk.

By providing the blank cells 120BL together with the red, green, and blue cells 120R, 120G, and 120B as described above, since the visible light of the blank cells 120BL is not emitted, the unit light capable of expressing the lowest gray level is reduced. This improves the low gradation expression ability.

In addition, on the front substrate 30, display electrodes 35 extending in the second direction x are arranged to be parallel to each other in the first direction y. Since the display electrode 35 extends in the second direction x to cross the blank cell 120BL, the display electrode 35 is disposed over all of the red, green, and blue cells 120R, 120G, and 120B and the blank cell 120BL. .

The display electrode 35 includes a sustain electrode 32 and a scan electrode 34 corresponding to each of the red, green, and blue cells 120R, 120G, and 120B and forming a discharge gap. For example, each of the sustain electrode 32 and the scan electrode 34 may include the transparent electrodes 32a and 34a formed along the second direction x on the front substrate 30, and the transparent electrodes 32a, Bus electrodes 32b and 34b formed on 34a).

The transparent electrodes 32a and 34a are made of indium tin oxide (ITO) to secure the transmittance of visible light, and the bus electrodes 32b and 34b are made of metal to secure the electrical conductivity of the transparent electrodes 32a and 34a.

In addition, a second dielectric layer 36 is formed on the front substrate 30 to cover the display electrodes 35. The second dielectric layer 36 protects the display electrodes 35 during gas discharge, and forms and accumulates wall charges during discharge.

On this second dielectric layer 36, a protective film 37 made of MgO, for example, is formed. The protective film 37 protects the second dielectric layer 23 and increases the secondary electron emission coefficient during discharge to lower the discharge start voltage.

For example, the partition 23 is formed of a red series, and the second dielectric layer 36 is formed of a blue series. The red-based brown and blue-based blue can form a more effective complementary color relationship through the non-discharge cells of the blank cell 120BL. That is, since the blank cell 120BL is not disturbed by the phosphor layers 25R, 25G, and 25B like the other red, green, and blue cells 120R, 120G, and 120B, the blank cell 120BL may further improve the color temperature by improving the complementary color relationship. have.

FIG. 4 is a partially exploded perspective view of the plasma display panel according to the second embodiment of the present invention, and FIG. 5 is a partial view showing the pixel and electrode arrangement of the plasma display panel according to the second embodiment of the present invention. Top view.

Referring to these drawings, the second embodiment has a similar or identical structure and operation to that of the first embodiment, and therefore, descriptions of the same parts will be omitted here and different parts will be described.

In the second embodiment, the partition wall 123 may include the first partition wall members 123a formed in the first direction y and the first partition wall members 123a between the first partition wall members 123a adjacent to each other. And second partition wall members 123b disposed in a second direction x that intersect with each other.

That is, the first partition member 123a and the second partition member 123b form cells in a matrix structure. Accordingly, the second partition members 123b independently partition the red, green, and blue cells 220R, 220G, and 220B along the first direction y.

The partition wall 123 of the matrix structure can prevent cross talk between the cells of the red, green, and blue cells 220R, 220G, and 220B more effectively than the stripe shape of the first embodiment. In other words, crosstalk in the first direction y is prevented.

However, the blank cell 220BL is partitioned from the red, green, and blue cells 220R, 220G, and 220B along the second direction x by the first partition members 123a. In this case, although the red, green, and blue cells 220R, 220G, and 220B are formed in a matrix structure, the blank cells 220BL may have improved exhaust performance.

In addition, the blank cells may be independently partitioned in the first direction y, such as red, green, and blue cells (not shown).

Meanwhile, the display electrode 135 includes a sustain electrode 133 and a scan electrode 134, and each of the sustain electrode 133 and the scan electrode 134 has a transparent electrode 133a and 134a and a bus electrode 133b and 134b. To form).

The transparent electrodes 133a and 134a are formed as protruding electrodes at the centers of the red, green, and blue cells 220R, 220G, and 220B, respectively. This projecting electrode shows that the transparent electrode can be implemented in various ways.

The transparent electrodes 133a and 134a are formed only in the red, green, and blue cells 220R, 220G, and 220B, and are not formed in the blank cell 220BL. Compared with the first embodiment, since the transparent electrode is not provided in front of the blank cell 220BL, the complementary color effect of the red barrier rib 123 and the blue dielectric layer 136 may be further improved.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It goes without saying that it belongs to the scope of the present invention.

As described above, according to the plasma display panel according to the present invention, since four subpixels of red, green, blue, and blank subpixels are arranged in a straight line to configure one pixel, the unit light is reduced, thereby lowering the gray scale display ability. Has the effect of improving.

In addition, according to the plasma display panel according to the present invention, since the partition of the rear substrate is formed in brown and the dielectric layer of the front substrate is formed in blue, it is effective to form a more effective complementary color relationship and to improve the color temperature. By directly exposing the brown and the dielectric layer blue of the partition wall has an effect of implementing the complementary color relationship better.

Claims (10)

A first substrate and a second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition cells; Address electrodes formed in a first direction between the second substrate and the first substrate; Display electrodes electrically spaced apart from the address electrodes and formed along a second direction crossing the first direction; A phosphor layer formed on the cell; And A dielectric layer covering the display electrode; The cells are formed of red, green, blue cells and blank cells, The dielectric layer is formed in blue, The barrier ribs are brown. delete According to claim 1, The red, green, blue cells and blank cells are sequentially disposed along the second direction. The method of claim 3, wherein And the blank cell is partitioned into a pair of neighboring partitions between a dielectric layer formed on the first substrate and a dielectric layer covering the display electrode. According to claim 1, The barrier ribs may include first barrier members extending along the first direction and disposed parallel to each other along the second direction to partition cells along the second direction. The method of claim 5, And the partition wall includes second partition wall members extending in the second direction between the first partition wall members to partition cells along the first direction. The method of claim 6, The red, green, and blue cells are partitioned into the first partition members and the second partition members, And the blank cell is partitioned into the first partition members. The method of claim 7, wherein The display electrode includes a protruding electrode protruding toward the center of the cell, and a bus electrode connecting the protruding electrode along the second direction. The protruding electrode is provided only in the red, green, and blue cells. According to claim 1, And the address electrode is provided only in the red, green, and blue cells. According to claim 1, The phosphor layer is provided only in the red, green and blue cells.

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