KR20080040365A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance light room contrast and to increase luminance by forming a blackening part in a non-discharge region. A first substrate(10) and a second substrate are arranged opposite to each other. A barrier rib(16) is arranged between the first and second substrates in order to define discharge cells. An address electrode is extended in a first direction. A first dielectric layer(40) is formed to cover the address electrode. A first and second electrodes are extended in a second direction crossing the first direction and are formed on one of the first and second substrates corresponding to the discharge cells. A second dielectric layer is formed to cover the first and second electrodes. A protective layer(23) is formed to cover the dielectric layer. The second dielectric layer, the protective layer, and the first substrate are colored with respective colors. The barrier rib and the first dielectric layer are composed of transparent materials.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a perspective view schematically illustrating an exploded view of a plasma display panel in order to explain an 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 showing an arrangement relationship between colored partitions and electrodes for explaining an embodiment of the present invention. FIG.

4 is a diagram illustrating a plasma display panel in order to explain an operation according to an exemplary embodiment of the present invention.

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

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

13, 40: dielectric layer 16: partition wall

19: fluorescent layer 20: second substrate (front substrate)

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

32: second electrode (scanning electrode)

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 that can form a black portion by subtractive mixing of colorants, thereby improving material contrast and reducing the cost of a manufacturing process.

In general, a plasma display panel uses red, green, and blue colors generated by exciting a phosphor using vacuum ultraviolet (VUV) emitted from a plasma obtained through gas discharge. A display device for realizing an image with visible light.

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 barrier ribs are disposed between the address electrodes on the dielectric layer to form a stripe shape. The barrier ribs are formed with phosphor layers of red, green, and blue. 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 a protective film cover the display electrodes. The discharge cell is disposed at a point where the 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 plasma display panel adopts a complementary color design using two colors that make up a complementary color to improve contrast. The structure using the complementary color relationship can color one color on the dielectric layer disposed on the front substrate side, and color the partition wall with another color having a complementary color relationship with the color colored on the dielectric layer. In this case, the dielectric layer, which is colored in a complementary color, and the partition wall overlap each other to form a black portion without separately patterning the non-discharge region to form a black layer. The colored partitions as described above may be damaged in the manufacturing process due to the instability of the material by the color pigments, there is a problem that a defective product can be produced. That is, the colored partition wall may be damaged due to the reduction of the component of TiO ₂ , which is a reinforcing material due to the coloring pigment, and thus may cause the partition wall to be broken. There is a problem that can fall. In addition, the colored partition wall has a problem of absorbing visible light to reduce the brightness.

Accordingly, the present invention has been proposed to solve the above problems, and an object of the present invention is to provide a plasma display panel which forms a black portion by subtractive mixing to reduce external light reflection brightness while minimizing brightness reduction while improving bright room contrast. It is.

In addition, the present invention is to provide a plasma display panel that can sufficiently maintain the strength of the partition wall to maintain the quality of the product caused by the defect of the cell and can reduce the material cost and the number of processes.

In order to achieve the above object, the present invention, the first substrate and the second substrate facing each other, the partition wall disposed between the first substrate and the second substrate to partition the discharge cells, corresponding to the discharge cells An address electrode extending in a first direction, a dielectric layer covering the address electrode, one selected from the first substrate and the second substrate corresponding to the discharge cells, respectively, extending in a second direction crossing the first direction A first electrode and a second electrode formed on a substrate, another dielectric layer covering the first electrode and the second electrode, and a passivation layer covering the dielectric layer covering the first electrode and the second electrode, wherein the first electrode The dielectric layer covering the second electrode and the second electrode, the passivation layer, and the first substrate are colored in different colors, and the dielectric layer covering the barrier rib and the address electrode is made of a transparent material. Provide a Rasma display panel.

The dielectric layer covering the first electrode and the second electrode, the passivation layer, and the first substrate are preferably colored in different colors from cyan, yellow, and purple, which are three primary colors of the colorant. Do.

Preferably, the colored dielectric layer covering the first electrode and the second electrode, the protective film, and the first substrate maintain a complementary color relationship by subtractive mixing with respect to the other selected two.

The dielectric layer covering the first electrode and the second electrode is preferably colored cyan.

The protective film is preferably colored in purple (Magenta).

Preferably, the first substrate is colored in yellow.

The partition wall may include first partition wall members extending in the first direction and formed at intervals corresponding to the discharge cells along the second direction.

The partition wall may further include second partition wall members extending in the second direction between the partition wall members and formed at intervals corresponding to the discharge cells along the first direction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view schematically illustrating a disassembled plasma display panel for explaining an 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 an embodiment may be disposed to face each other at a distance from each other, such that the first substrate 10 (hereinafter, referred to as a “back substrate”) and the second substrate 20 (hereinafter, “ Front substrate ”and partition walls 16 provided between the substrates 10 and 20. The partition wall has 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 containing neon (Ne), xenon (Xe), etc.) so as to generate a vacuum ultraviolet ray by gas discharge, and absorbs the vacuum ultraviolet ray to visible light A phosphor layer 19 emitting light is provided.

In order to implement an image by gas discharge, the plasma display panel includes an address electrode 11 and a first electrode 31, hereinafter, corresponding to each discharge cell 17 between the rear substrate 10 and the front substrate 20. A "holding electrode") and a second electrode 32 (hereinafter referred to as "scanning electrode").

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 and is formed in the discharge cells 17 adjacent in the y-axis direction. Corresponds continuously. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to adjacent discharge cells 17 in a second direction (the x-axis direction in the drawing) that crosses the y-axis direction.

These address electrodes 11 are covered with a dielectric layer 13 covering the inner surface of the back substrate 10. The 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 of an opaque electrode, that is, a metal electrode having excellent electrical conductivity.

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

In the embodiment of the present invention, an example in which the discharge cells 17 have a matrix structure is illustrated and described. However, the present invention is not limited thereto, and the second partition wall 16b is removed and the discharge cells are formed by the first partition member 16a. It is also possible to have a stripe structure.

The phosphor layer 19 formed in the discharge cells 17 is coated with a phosphor paste on the side of the partition wall 16 and the surface of the dielectric layer 13 positioned between the partition walls 16, and dried and exposed to the phosphor layer 19. , Developing and firing. The phosphor layer 19 is repeatedly formed by red, green, and blue phosphors in the discharge cells 17 repeatedly arranged along the x-axis direction.

On the other hand, referring to Figure 3, the sustain electrode 31 and the scanning electrode 32 is provided on the inner surface of the front substrate 20, each discharge cell 17 to cause gas discharge in the discharge cells 17 In response to this, a surface discharge structure is formed. The sustain electrode 31 and the scan electrode 32 extend in the x-axis direction crossing the address electrode 11. In addition, the sustain electrode and the scan electrode may be provided between the front substrate and the rear substrate to form a counter discharge structure corresponding to the discharge cells (not shown).

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 low voltage signal to the transparent electrodes 31a and 32a, respectively. . 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 preferably made 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 the widths W31 and W32 around the discharge cells 17 along the y-axis direction, and at the center of each discharge cell 17. A discharge gap is formed. The bus electrodes 31b and 32b are disposed on the transparent electrodes 31a and 32a and extend in the x-axis direction from 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.

1 and 2, the sustain electrode 31 and the scan electrode 32 intersect the address electrodes 11 and face each other in correspondence with the discharge cells 17. Covered with The dielectric layer 40 forms and accumulates wall charges during discharge while preventing the sustain electrode 31 and the scan electrode 32 from being damaged during the gas discharge process.

This dielectric layer 40 is covered with a protective film 23. For example, the protective film 23 is formed of MgO to protect the dielectric layer 40, thereby increasing the secondary electron emission coefficient during discharge. During the driving of the plasma display panel, a reset discharge is generated by a reset pulse applied to the scan electrode 31 in the reset period, and the scan pulse and the address electrode 11 applied to the scan electrode 32 in the addressing period following the reset period. The address discharge is generated by the address pulse applied to the C), and then the sustain discharge is generated by the sustain pulses applied to the sustain electrode 31 and the scan electrode 32 in the sustain period.

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 address electrodes. Reference numeral 11 serves as an electrode for applying an address pulse. The sustain electrode 32, the scan electrode 32, and the address electrode 11 may have different roles depending on the voltage waveforms applied to the sustain electrodes 32, the scan electrodes 32, and the address electrodes 11, respectively.

The plasma display panel selects the discharge cells 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. An image is realized by driving the selected discharge cell 17 by the sustain discharge.

On the other hand, the plasma display panel according to an embodiment of the present invention, as shown in Figure 4, the dielectric layer 40 provided on the front substrate 20 described above, the protective film 23 for protecting the dielectric layer 40 And, the back substrate 10 is one color selected from the primary colors forming the three primary colors are colored on each. That is, the dielectric layer 40, the passivation layer 23, and the back substrate 10 may be selected from one of the primary colors of three primary colors, cyan, purple, and yellow, and colored. For example, cyan may be colored in the dielectric layer 40, Magenta may be colored in the protective layer 23, and yellow may be colored in the back substrate 10. And the partition 16 is preferably made of a transparent material. In addition, the dielectric layer 13 disposed on the rear substrate 10 side and covering the address electrode 11 may be made of a transparent material similar to the material of the barrier rib 16 described above. In particular, the material forming the partition 16 and the dielectric layer 13 covering the address electrode 11 may be made of the same material. Thus, when the dielectric layer 13 covering the partition wall 16 and the address electrode 11 is made of the same material, it is possible to reduce the type of material, thereby reducing the material cost and simultaneously forming it. Can be reduced.

As described above, the primary color having high saturation is colored in the dielectric layer 40, the protective film 23, and the back substrate 10, so that the degree of coloring may be relatively low as compared with a color in which two or more colors are mixed. As described above, the embodiment of the present invention forms a black portion along the width (D1, D2, shown in FIG. 4) of the partition wall 16, which is a portion where the three primary colors overlap with the primary color having a high saturation by subtractive mixing of colors. To make it possible. Therefore, the black portion can be formed by a simple process by a subtractive mixing method of color without making a separate black layer in the non-discharge region, thereby improving the bright room contrast.

In particular, the partition 16 may not be colored, thereby eliminating instability due to the colored pigment. Therefore, the partition wall 16 maintains sufficient strength by stabilizing the material, thereby reducing occurrence of defects such as phosphor scattering due to breakage of the partition wall. In addition, since the partition wall 16 is made of a transparent material, absorption of visible light is suppressed, thereby minimizing luminance reduction.

According to the exemplary embodiment of the present invention, cyan on the dielectric layer 40, Magenta on the protective layer 23, and yellow on the back substrate 10 are colored, and the partition 16 and the address electrode 11 are colored. The dielectric layer 13 covering) is described with an example made of a transparent material. However, the embodiment of the present invention is not limited to this example. When cyan is colored in the dielectric layer 40, the protective layer 23 and the back substrate 10 except for cyan among the three primary colors are excluded. Different colors can each be colored. In addition, when purple (Magenta) is colored in the passivation layer 23, the dielectric layer 40 and the back substrate 10 may be colored in a color other than purple (Magenta) among the three primary colors, respectively. Of course, when yellow is colored on the back substrate 10, the dielectric layer 40 and the passivation layer 23 may be colored except for yellow among the three primary colors. These other examples show that it can be carried out variously while achieving the object of the present invention.

On the other hand, the dielectric layer 40, the protective film 23, and the back substrate 10 described above are to be formed by using a material in which the primary colors selected from the three primary colors are colored in the process of forming each. For example, when the dielectric layer 40 is colored in cyan, the pigment constituting the cyan may be mixed with the material forming the dielectric layer 40 in the same manner as in the conventional method of manufacturing the dielectric layer.

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, in the plasma display panel of the present invention, a dielectric layer covering the first electrode and the second electrode, a protective film for protecting the dielectric layer, and a primary color having high saturation are respectively colored on the rear substrate, and disposed on the partition wall and the rear substrate side. The dielectric is made transparent so that black portions are formed in the non-discharge region by subtraction mixing. Accordingly, the plasma display panel of the present invention has the effect of increasing the luminance by increasing the reflectance on the rear substrate and minimizing the light absorption at the partition wall while improving the clear room contrast.

In addition, the plasma display panel of the present invention has the effect of stabilizing the material to maintain sufficient strength and increase the quality by using a transparent material containing no color pigment in the partition and the dielectric layer disposed thereunder.

In addition, the plasma display panel of the present invention can design the partition and the dielectric layer disposed below the same material to reduce the material cost, and can form the partition and the dielectric layer at the same material at the same time to reduce the number of processes There is.

Claims (8)

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 discharge cells; An address electrode extending in a first direction corresponding to the discharge cells; A dielectric layer covering the address electrode; First and second electrodes each extending in a second direction crossing the first direction and formed on one substrate selected from the first substrate and the second substrate corresponding to the discharge cells; Another dielectric layer covering the first electrode and the second electrode; A passivation layer covering a dielectric layer covering the first electrode and the second electrode; Including; The dielectric layer covering the first electrode and the second electrode, the passivation layer, and the first substrate are colored in different primary colors, and the dielectric layer covering the barrier rib and the address electrode is made of a transparent material. The method according to claim 1, The dielectric layer covering the first electrode and the second electrode, the passivation layer, and the first substrate, A plasma display panel that is colored in a different color from among three primary colors of cyan, yellow, yellow and purple. The method according to claim 1, And a colored dielectric layer covering the colored first electrode and the second electrode, the passivation layer, and the first substrate to maintain a complementary color relationship by subtractive mixing with respect to the other selected two. The method according to claim 2, And a dielectric layer covering the first electrode and the second electrode is colored in cyan. The method according to claim 2, The protective film is a plasma display panel colored in purple (Magenta). The method according to claim 2, And the first substrate is colored yellow. The method according to claim 1, The partition wall And first partition members extending in the first direction and formed at intervals corresponding to the discharge cells along the second direction. The method according to claim 7, The partition wall And second barrier rib members extending in the second direction between the barrier rib members and formed at intervals corresponding to the discharge cells along the first direction.

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