KR20010092557A - fluorescent substance paste of plasma display panel - Google Patents

Abstract

PURPOSE: A fluorescent paste for plasma display panel is provided to prevent driving voltage rise and luminance deterioration by improving density and reducing thickness of the fluorescent layer. CONSTITUTION: A fluorescent paste is composed of a fluorescent material powder, organic solvent and two or more types of binders having different baking temperatures. Alternatively, a fluorescent paste is composed of 30 to 50% fluorescent material powder, 3 to 10% ethyl cellulose resin which is used as the first binder and baked at a temperature of 300°C or higher, 2 to 5% acrylic resin which is used as the second binder and baked at a temperature of 200°C or higher, and 40 to 50% solvent used as an organic solvent. Since the space between particles of fluorescent material is reduced during baking process, fluorescent material have an improved density.

Description

Fluorescent substance paste of plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, which is a flat panel display device, and more particularly, to a phosphor paste of a plasma display panel.

In general, the plasma display panel is a flat panel display device that can be manufactured in a thin film form compared to the conventional CRT (Cathode Ray Tube) as well as its high contrast ratio and high brightness. Reached.

As shown in FIG. 1, the plasma display panel is divided into an upper structure and a lower structure.

1 is a cross-sectional view of one cell of the plasma display panel, and the same structure is repeated on both sides. In particular, the upper structure shows a structure rotated by 90 ° for convenience of description.

The upper structure consists of a pair of scan electrodes and a common electrode on the surface of the front glass substrate 1 to form a sustain electrode 4 for maintaining the discharge, and a dielectric layer 2 on the sustain electrode 4. ) Is formed by the printing technique. The protective layer 3 is formed on the dielectric layer 2 by a deposition method.

On the other hand, in the lower structure, an address electrode 10 for driving an initial discharge of the sustain electrode 4 is formed on the rear glass substrate 9, and the sustain electrode 4 is disposed with the address electrode 10 interposed therebetween. The partition wall 6 is formed between the cell and the address electrode 10 to prevent crosstalk between adjacent cells. The fluorescent layer 8 is formed on the entire surface of the address electrode 10 including the partition 6 and the glass substrate 9.

Meanwhile, an inert gas is sealed in the space between the upper structure and the lower structure to form a discharge region 5.

In this structure, when a driving voltage is applied to the pair of sustain electrodes 4 by the address electrode 10, the surfaces of the dielectric layer 2 and the protective layer 3 in the discharge region 5 are applied. Surface discharge occurs and thus ultraviolet rays 7 are generated. The ultraviolet light 7 excites the phosphor of the fluorescent layer 8 to emit light. Subsequently, the color of each pixel is displayed by the light emission of the fluorescent layer 8.

Looking at the formation process of the fluorescent layer 8 in the plasma display panel in detail, after the partition 6 is formed, a phosphor paste is printed using a screen mask of a corresponding pattern, and then formed through drying and firing processes. do.

In this case, the conventional phosphor paste is composed of 30 to 50% phosphor powder, 5 to 10% ethyl cellulose (Ethyl Cellulose) resin used as a binder, and 40 to 50% solvent (Solvent) which is an organic solvent.

Therefore, as shown in FIG. 2, as the solvent is volatilized as the drying process is performed at 100 to 200 ° C., the cellulose resin used as the binder is calcined as the firing process is performed at 200 to 400 ° C., and finally only the phosphor is used. The remaining fluorescent layer 8 is formed.

Particle Size (μm) R 2.5 G 3.0 B 3.5

In this case, as shown in Table 1, the R, G, and B phosphor powders have different particle sizes, and R, G, and B because the spaces exist between the phosphor powder particles due to the space generated as the ethyl cellulose resin is burned during the firing process. Of course, the fluorescent layer is formed thicker, especially in the case of relatively large particles G and B fluorescent layer is formed thicker than the R fluorescent layer.

The phosphor paste of the plasma display panel according to the prior art has the following problems.

First, since the fluorescent layer is formed thick by the space generated in the formation process, the discharge space is relatively reduced, leading to an increase in the driving voltage.

Second, since the density of each of the R, G, and B fluorescent layers decreases, the transmittance of visible light and ultraviolet rays increases, leading to a decrease in emission luminance.

Accordingly, the present invention has been made to solve the above-mentioned problems, and provides a phosphor paste of a plasma display panel to improve the compactness of the fluorescent layer to prevent a rise in driving voltage and lowering of luminance of light by improving the density of the fluorescent layer. Has its purpose.

1 is a cross-sectional view showing the structure of a general plasma display panel

2 is a graph showing a phosphor layer forming process using a phosphor paste according to the related art.

3 is a graph showing a phosphor layer forming process using the phosphor paste according to the present invention.

Explanation of symbols for main parts of the drawings

1: glass substrate 2: dielectric layer

3: protective layer 4: sustaining electrode

5: discharge area 6: partition wall

7: ultraviolet ray 8: fluorescent layer

9: glass substrate 10: address electrode

The phosphor paste of the plasma display panel according to the present invention is characterized in that it comprises a phosphor powder, an organic solvent and at least two kinds of binders having different firing temperatures.

The phosphor paste of the plasma display panel according to the present invention is characterized by being composed of phosphor powder, ethyl cellulose (Ethyl Cellulose) resin, acrylic resin, and solvent.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the phosphor paste of the plasma display panel according to the present invention.

First, in order to improve the compactness of the fluorescent layer, that is, to remove the space generated in the process of firing the ethyl cellulose resin acting as a binder, a second firing at a low temperature compared to the conventional binder in the phosphor paste component The method of adding the binder is applied and the detailed description is as follows.

The phosphor paste according to the present invention is used as a phosphor powder of 30 to 50%, a first binder (Binder), and used as a second binder of 3 to 10% ethyl cellulose (Ethyl Cellulose) resin, which is calcined at 300 ° C. or higher, and the first binder. It is composed of 2 to 5% of acrylic resin (Acrylic resin) and 40 to 50% of solvent (Solvent) which is an organic solvent which is fired at a low temperature, that is 200 ℃ or more compared to the binder.

Therefore, as shown in Figure 3, the solvent is volatilized as the organic solvent proceeds the drying step of 100 ~ 200 ℃ and the acrylic resin, a second binder newly added in the present invention is fired as the firing process of 200 ~ 300 ℃ .

At this time, since the second binder is fired and heat for the firing process is continuously applied, phosphor particles flow into the space formed by the space of the second binder to fill the space.

Subsequently, as the calcination process is performed at 300 to 400 ° C., the ethyl cellulose resin as the first binder is calcined, and finally, only the phosphor remains to form the phosphor layer 8.

At this time, since the first binder is fired, the space between the phosphor particles is further reduced, and thus, the density of the phosphor particles in the phosphor layer is improved.

When the phosphor layer is formed using the phosphor paste according to the present invention, the following effects can be obtained.

First, since the density of the phosphor particles in the phosphor layer is improved, the visible light and the ultraviolet ray transmittance may be lowered, thereby improving luminance.

Second, since the fluorescent layers are formed to be thin and uniform in each of the R, G, and B fluorescent layers, the discharge space increases and the discharge voltage is lowered, thereby improving the efficiency of the plasma display panel.

Claims (4)

In the phosphor paste of the plasma display panel for forming the fluorescent layer through printing and heat treatment, The phosphor paste includes a phosphor powder, an organic solvent, and at least two kinds of binders having different firing temperatures. According to claim 1, And at least two or more kinds of binders having different firing temperatures use a material having a higher temperature than that of the organic solvent. According to claim 1, At least two or more kinds of binders having different firing temperatures include an ethyl cellulose resin and an acrylic resin. In the phosphor paste of the plasma display panel for forming the fluorescent layer through printing and heat treatment, The phosphor paste is a phosphor paste of the plasma display panel, characterized in that consisting of phosphor powder, ethyl cellulose (Ethyl Cellulose) resin, acrylic resin and solvent (Solvent).