KR20080088730A - Plasma display panel and method for manufacturing the same - Google Patents

Abstract

A plasma display panel and a manufacturing method thereof are provided to reduce power consumption of the PDP(Plasma Display Panel) by forming a step difference on an upper dielectric of the PDP. A plasma display panel includes first and second panels and first and second dielectric materials(90a,90b). The first and second panels are arranged to face each other with a barrier rib between them. The first dielectric material is formed on the first panel. The second dielectric material is formed on the first dielectric material. The second dielectric material has a gray, black, or chromatic color. A step difference is formed on the second dielectric material. The second dielectric material contains metal oxide. The second dielectric material contains a material, which is selected from the group consisting of Co oxide, Cu oxide, Mn oxide, or Cr oxide.

Description

Plasma display panel and method for manufacturing the same

1 is a cross-sectional view of an upper panel of an embodiment of a plasma display panel according to the present invention;

2 is a perspective view showing a discharge cell structure of an embodiment of a plasma display panel according to the present invention;

3 is a flowchart of an embodiment of a method of manufacturing a plasma display panel according to the present invention;

4 to 5b are views illustrating a manufacturing process of an embodiment of a method of manufacturing a plasma display panel according to the present invention.

<Explanation of symbols for main parts of the drawings>

10 lower glass 20 address electrode

30: lower plate dielectric 40: partition wall

50a, 50b, 50c: phosphor 60: discharge gas

70: top glass 80a: transparent electrode

80b: black matrix 80c: bus electrode

90a: first dielectric 90b: second dielectric

95: second dielectric material 100: protective film

200: mask

With the advent of the multimedia era, display devices that can express more detailed, larger, and more natural colors are required. However, the current CRT (Cathode Ray Tube) has a limit to compose a large screen of 40 inches or more, and the LCD (Liquid Crystal Display), PDP (Plasma Display Panel), and projection TV (Television) are used for high definition video. It is rapidly developing for expansion.

The maximum characteristics of the display device such as the PDP can be manufactured in a thin thickness compared to the CRT, which is self-luminous, and is easy to manufacture a large flat screen (60 to 80 inches) and clearly distinguished from the conventional CRT in terms of style and design. Becomes

However, the above-described conventional plasma display panel has the following problems.

In order to increase the discharge efficiency of the plasma display panel, a long gap structure has been studied. However, since the discharge current increases in the long gap structure, it is necessary to reduce the discharge efficiency in order to increase the discharge efficiency. However, the discharge current of the plasma display panel is greatly affected by the thickness of the top dielectric. In general, when the thickness of the top dielectric is low, the discharge start voltage is low and the discharge current is increased. When the thickness of the top dielectric is thick, the discharge start voltage is increased and the discharge current is decreased. In other words, if the thickness of the top dielectric is simply increased, the discharge current is decreased, but the discharge start voltage is increased.

In addition, the above-described conventional plasma display panel also has the following problems.

The contrast ratio of the plasma display panel refers to a ratio of maximum brightness and minimum brightness. In addition, since the plasma display panel has a high reflectance of light in the bright room, the bright display contrast is lower than that of other display devices such as a liquid crystal display (LCD). In addition, as the reflectance of the external light increases, the color temperature of the plasma display panel decreases.

The present invention is to solve the above problems, an object of the present invention is to improve the discharge efficiency by forming a step in the top dielectric of the plasma display panel.

Another object of the present invention is to increase the contrast and improve the color temperature of the plasma display panel.

In order to achieve the above object, the present invention is a plasma display panel comprising a first panel and a second panel facing each other with a partition therebetween, comprising: a first dielectric formed on the first panel; And a second dielectric formed on the first dielectric and colored, gray or black and having a step.

According to another embodiment of the present invention, forming a first dielectric on the upper plate glass on which a sustain electrode pair is formed; Forming a second dielectric on the first dielectric, the second dielectric being colored, gray or black and having a step; And bonding the first panel including the upper plate glass to the second panel with the partition wall therebetween.

Here, the second dielectric includes a metal oxide, and more particularly, includes a material selected from the group consisting of metal oxides of cobalt, copper, manganese, or chromium.

In addition, the second dielectric is formed only on the first dielectric corresponding to the non-discharge space.

In the XGA class, the first dielectric is 5 to 30.5 micrometers thick, the second dielectric is 7.5 to 33 micrometers thick, and the second dielectric is formed 200 to 400 micrometers apart from each other, each width 276 ~ 476 micrometers.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

1 is a cross-sectional view of an upper panel of an embodiment of a plasma display panel according to the present invention. An upper panel of an embodiment of a plasma display panel according to the present invention will be described with reference to FIG. 1.

In the present exemplary embodiment, the upper panel (first panel) is formed by forming a pair of sustain electrodes, a first dielectric 90a, a second dielectric 90b, and a protective film 100 on the upper glass 70. The upper glass 70 is formed by processing a glass for display, soda-lime glass, or the like. And the sustain electrode pair is formed on the upper plate glass 70. The sustain electrode pair includes a transparent electrode 80a and a bus electrode 80c. In addition, a black matrix 80b is provided on the sustain electrode pairs to reduce reflection of external light.

And the 1st dielectric 90a is formed on the upper plate glass 70 in which the sustain electrode pair was formed. The first dielectric 90a is made of low melting glass and is a transparent dielectric because it must transmit visible light emitted from the discharge cell. The first dielectric 90a should be formed to cover all of the sustain electrode pairs described above. Here, in the XGA class, the thickness of the first dielectric 90a is approximately 5 to 30.5 micrometers (µm).

On the first dielectric 90a, a second dielectric 90b is formed. Here, the second dielectric 90b is preferably colored, gray or black rather than transparent. The second dielectric 90b is preferably patterned to have a step difference. In addition, the second dielectric 90b is preferably formed corresponding to the non-discharge portion where the discharge of plasma gas does not occur. That is, the second dielectric 90b is not formed at a position corresponding to the discharge portion. Therefore, as shown in the figure, it is preferable not to be formed at a position corresponding to the space between the transparent electrodes 80a.

In addition, the second dielectric 90b includes a metal oxide, and the color is determined according to each metal. For example, if the second dielectric 90b comprises a material selected from the group consisting of oxides of cobalt (Co), copper (Cu), manganese (Mn) and chromium (Cr), the second dielectric 90b becomes blue. In the XGA class, the width of each discharge section, that is, the distance between the transparent electrode pairs, is about 200 to 400 micrometers. Thus, since the distance between the centers of each second dielectric 90b is 676 micrometers, the width of each second dielectric 90b is 276-476 micrometers. And since the thickness of the entire dielectric is about 35 micrometers, the second dielectric 90b has a thickness of 7.5 to 33 micrometers.

As described above, the plasma display panel according to the present embodiment has a dielectric structure formed on the upper panel in a differential structure in order to increase discharge efficiency and lower power consumption. In forming a dielectric having a differential structure, the dielectric was formed in a two-layer structure. That is, after forming a first dielectric having a constant thickness to cover the sustain electrode pairs, only a portion of the first dielectric was formed with the second dielectric. The second dielectric is not a transparent dielectric but has a constant color. Therefore, the dielectric of the differential structure can increase the discharge efficiency of the plasma display panel and lower the power consumption. In addition, since the second dielectric is colored, part of the external light is absorbed to improve bright room contrast and color temperature. If the second dielectric material is blue, the light transmittance may be lowered by about 8 to 15%. However, the effect of contrast enhancement and color temperature improvement due to increased absorption of external light is remarkable. If the second dielectric is formed in black, a black top on the black matrix or the partition wall may not be formed. In addition, even when the second dielectric is formed in green, the effect of improving the brightness can be expected. However, when the second dielectric is formed to be white, an increase in reflectance is expected in addition to a decrease in light transmittance, which is not preferable.

A protective film 100 is coated on the first dielectric 90a and the second dielectric 90b. During discharge of the plasma display panel, the dielectric provided in the upper panel is worn down due to the impact of positive ions, and at this time, a metallic material such as sodium (Na) may short the electrode. Therefore, a thin film of magnesium oxide or the like is coated with the protective film 100 to protect the top dielectric. Here, magnesium oxide can withstand the impact of (+) ions well and has a high secondary electron emission coefficient, thereby lowering the discharge start voltage. The protective film 100 is formed of magnesium oxide by an electron beam deposition method, a stuffing method, an ion plating method, or the like. Since the dielectric has a step as described above, the surface of the protective film laminated on the dielectric also has a similar step.

2 is a perspective view showing a discharge cell structure of an embodiment of a plasma display panel according to the present invention. The discharge cell structure of an embodiment of a plasma display panel according to the present invention will be described with reference to FIG. 2.

In the plasma display panel according to the present exemplary embodiment, an upper panel (first panel) and a lower panel (second panel) face each other with a partition therebetween. Here, the structure of the upper panel is as described above.

In the lower panel, the address electrodes 20 are arranged on the lower plate 10 so as to intersect the sustain electrode pairs. On the lower panel, barrier ribs 40 of stripe type (or well type, etc.) are arranged in parallel to form a plurality of discharge spaces, that is, discharge cells. And, a plurality of address electrodes for generating vacuum ultraviolet rays by performing address discharge are arranged in parallel with the partition wall. On the upper side of the lower panel, red (R), green (G), and blue (B) phosphors 50a, 50b, and 50c, which emit visible light for image display during address discharge, are coated. A lower dielectric 30 is formed between the address electrode and the phosphor to protect the address electrode. Here, the lower dielectric 30 is preferably white in order to increase the luminance of the plasma display panel.

3 is a flowchart of one embodiment of a method of manufacturing a plasma display panel according to the present invention, and FIGS. 4 to 5b are views illustrating a manufacturing process of an embodiment of the method of manufacturing a plasma display panel according to the present invention. 3 to 5b, an embodiment of a method of manufacturing a plasma display panel according to the present invention will be described.

First, a first dielectric is formed on the upper panel (S310). Specifically, it is as follows.

As shown in FIG. 4, the first dielectric 90a is formed on the upper glass 70 on which the sustain electrode pairs are formed. Here, the upper glass 70 is formed of a glass for display or soda lime glass through processing such as milling and cleaning (cleaning). Then, the transparent electrode 80a and the bus electrode 80c are sequentially formed with the sustain electrode pairs. Here, the transparent electrode 80a is formed of ITO (Indium-Tin-Oxide), SnO 2, or the like by a photoetching method by sputtering, a lift-off method by CVD, or the like. The bus electrode 80c is formed of a material containing silver (Ag) or the like by the screen printing method, the photosensitive paste method, or the like. In addition, although not shown, a black matrix may be formed on the sustain electrode pair. The low melting glass and the black pigment may be formed by a screen printing method or a photosensitive paste method.

And the 1st dielectric 90a is formed on the upper plate glass 70 in which the sustain electrode pair was formed. Here, the first dielectric 90a forms a dielectric material including transparent low melting glass through a screen printing method, a coating method, or laminating a green sheet. The first dielectric 90a is formed to have a thickness of 5 to 30.5 micrometers so as to cover the sustain electrode pair.

Subsequently, a second dielectric 90b is formed on the first dielectric 90a (S320). First, the material of the second dielectric 90b is prepared, which includes a metal oxide in addition to the low melting glass. After applying the material of the above-described second dielectric 90b, the second dielectric 90b having a step is formed by patterning. When the second dielectric 90b is formed by the screen printing method, the paste-type material is printed in a constant pattern.

However, when the second dielectric 90b is formed by a coating method or a green sheet method, a patterning process is required after first applying a dielectric material. As shown in FIG. 5A, a second dielectric material 95 is applied onto the first dielectric 90a. Subsequently, the second dielectric material 95 is patterned. In FIG. 5A, an example of covering and selectively exposing a mask 200 is illustrated. In FIG. 5A, light is selectively projected only on the portion where the mask 200 is not selected. After the above-described exposure process is finished, the second dielectric 90b is completed as shown in FIG. 5B through the development and firing process. In this case, the width of the second dielectric 90b may be adjusted by adjusting the width of the mask in the firing process.

The above-described patterning process will be described in detail as follows. The mask 200 is covered, and light is irradiated only to the position where the second dielectric 90b is to be formed. Here, light is preferably emitted only on the second dielectric material 95 on the non-discharge space. That is, light is emitted only at a width of about 276 to 476 micrometers in the XGA class. Upon completion of the above-described process, the second dielectric 90b is patterned with steps and has a thickness of 7.5-33 micrometers. In addition, although the second dielectric 90b is patterned in a trapezoid in FIG. 5B, the second dielectric 90b may be patterned in a rectangle. The completed, second dielectric 90b is colored, gray or black. If the metal oxide contained in the second dielectric material 95 comprises a material selected from the group consisting of oxides of cobalt (Co), copper (Cu), manganese (Mn) and chromium (Cr), The second dielectric 90b is blue.

Subsequently, when a protective film is formed on the first dielectric 90a and the second dielectric 90b, the upper panel is completed as shown in FIG. 1. The protective film 100 may be formed of magnesium oxide by an electron beam deposition method, a sputtering method, an ion plating method, or the like. In addition, since the upper dielectric has a differential structure, the protective film 100 also forms a step. Since the surface shape of the passivation layer 100 depends on the shape of the second dielectric 90b, the step of the passivation layer 100 in FIG. 1 may be inclined but may be formed at right angles.

Next, the upper panel is bonded to the lower panel on which the partition wall is formed (S310). Briefly describing the manufacturing process of the lower panel as follows. First, the glass for display or soda-lime glass is processed, and lower glass is formed. And an address electrode and a lower board dielectric are formed in order on the lower glass. The address electrode is formed of silver (Ag) or the like by a screen printing method, a photosensitive paste method or a photoetching method after sputtering. The lower dielectric forms a filler, such as low melting glass and TiO ₂ , by screen printing or lamination of a green sheet. Here, the lower dielectric preferably exhibits white color to increase the luminance of the plasma display panel.

Subsequently, a partition wall for separating each discharge cell is formed. The partition wall forms a filler such as low melting point glass and Al ₂ O ₃ directly by screen printing, or by a photosensitive paste method, etching method or sandblast method. Subsequently, phosphors are applied to a surface of the lower dielectric in contact with the discharge space and to side surfaces of the partition wall. The phosphors are sequentially coated with phosphors of R, G, and B according to each discharge cell, and are applied by screen printing or photosensitive paste.

Then, the upper panel and the lower panel are bonded to each other to seal, discharge impurities, and then discharge gas. The completed plasma display panel is as shown in FIG.

The present invention is not limited to the above-described embodiments, and such modifications are included in the scope of the present invention even if modifications are possible by those skilled in the art to which the present invention pertains.

The effects of the plasma display panel and the manufacturing method according to the present invention described above are as follows.

First, a step is formed in the top dielectric of the plasma display panel, so that the discharge start voltage is lowered and power consumption is improved.

Second, a portion of the top dielectric of the plasma display panel exhibits color, thereby reducing reflection of external light, thereby increasing contrast and increasing color temperature.

Claims (11)

In the plasma display panel comprising a first panel and a second panel facing each other with a partition wall therebetween, A first dielectric formed in the first panel; And And a second dielectric formed on the first dielectric and colored, gray or black and having a step difference. The method of claim 1, wherein the second dielectric, Plasma display panel comprising a metal oxide. The method of claim 2, wherein the second dielectric, A plasma display panel comprising a material selected from the group consisting of metal oxides of cobalt, copper, manganese or chromium. The method of claim 1, wherein the second dielectric, And a plasma display panel formed only on the first dielectric corresponding to the non-discharge space. The method of claim 1, wherein the first dielectric, Plasma display panel, characterized in that the thickness of 5 to 30.5 micrometers. The method of claim 1, wherein the second dielectric, Plasma display panel, characterized in that the thickness of 7.5 ~ 33 micrometers. The method of claim 1, And the second dielectrics are spaced apart from each other by 200 to 400 micrometers. The method of claim 1, And the second dielectric is 276 to 476 micrometers wide. Forming a first dielectric on the top glass on which the sustain electrode pairs are formed; Forming a second dielectric on the first dielectric, the second dielectric being colored, gray, or black and having a step; And And bonding the first panel including the upper plate glass to the second panel with a partition wall therebetween. The method of claim 9, wherein the forming of the first dielectric comprises: A method of manufacturing a plasma display panel, which is carried out by any one of a screen printing method, a coating method and a green sheet method. The method of claim 9, wherein forming the second dielectric comprises: Applying a dielectric material comprising a metal oxide on the first dielectric; And And patterning the dielectric material only on the first dielectric corresponding to the non-discharge space.

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