KR100755868B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel, and more particularly, to provide a composition region that satisfies the mutual conditions of firing temperature, dielectric constant, and thermal expansion coefficient, wherein Bi ₂ O _{3 is} added in an amount of 55 to 80 wt%; 10 to 30 wt% of B ₂ O ₃ added; 4-10 wt% of Al ₂ O ₃ added; 4 to 10 wt% added SiO ₂ , having a thermal expansion coefficient of 77 × 10 ⁻⁷ / ° C. to 84 × 10 ⁻⁷ / ° C. in a temperature range of 50 to 350 ° C., and a dielectric constant of 10 to 20. By providing a composition having a low temperature firing, it is possible to prevent the deformation of the substrate or to be applied to soda-lime glass substrate, the dielectric constant is improved to control the thickness of the dielectric layer, to reduce the process time, multi-sided process To respond.

PDP, calcined, glass, soda-lime, dielectric.

Description

Plasma Display Panel {Plasma display panel}

1 is a perspective view showing an example of a general plasma display panel

<Brief description of the main parts of the drawing>

10: upper panel 11: transparent substrate

14 dielectric layer 15 protective film

20: lower panel 21: lower substrate

22: address electrode 23: dielectric layer

24: bulkhead

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 provides a composition region that satisfies the mutual conditions of low firing temperature, dielectric constant, and thermal expansion coefficient.

Plasma display panel (PDP) is a type of light emitting device that displays an image by using a discharge phenomenon, and there is no need to mount an active device for each cell, so the manufacturing process is simple and the screen size is increased. It is easy to use and has a fast response speed, making it a popular display device for an image display device having a large screen.

As shown in FIG. 1, the PDP has a structure in which the upper panel 10 and the lower panel 20 face each other and overlap each other. The upper panel 10 has a pair of sustain electrodes arranged on an inner surface of the transparent substrate 11, and usually the sustain electrodes comprise a transparent electrode 12 and a bus electrode 13, respectively.

The sustain electrode is covered with a dielectric layer 14 for AC driving, and a protective film 15 is formed on the surface of the dielectric layer 14.

On the other hand, the inner surface of the lower panel 20, the address electrode 22 is arranged on the lower substrate 21, the dielectric layer 23 is formed thereon, and the address electrode 22 is partitioned on the dielectric layer 23. A stripe or well type barrier rib 24 is formed, and red, blue, and green phosphor layers 26 for color display are applied to the cells partitioned by the barrier rib 24 to form a subpixel.

The discharge cell 25 is divided into subpixels by the partition wall 24, and discharge gas is enclosed in the discharge cell 25, and one pixel includes the three subpixels.

The dielectric layers 14 and 23, the partition walls 24, and seal materials for sealing these layers are made of a dielectric, and since the PDP is usually formed on high strain glass, the firing temperature of such dielectrics May be 550-600 ° C.

However, these dielectrics are not applicable to soda-lime glass and are disadvantageous to the multifaceted process.

In response to this, low-temperature fired dielectric materials have been developed, but these are those for PbO-based glass, which are not environmentally friendly, resulting in a waste disposal cost.

The present invention is to solve the problems described above, by providing a composition region that satisfies the mutual conditions of the firing temperature, dielectric constant, and thermal expansion coefficient, so that it can be applied to soda-lime substrate, to cope with the multi-faceted odor process The present invention provides a plasma display panel.

In order to achieve the object of the present invention as described above, the present invention, Bi ₂ O _{3 is} added 55 to 80 wt%, B ₂ O _{3 is} added 10 to 30 wt%, Al _{2 is} added 4 to 10 wt% A composition comprising O ₃ , SiO ₂ added at 4 to 10 wt%, and a dielectric layer fabricated using such a composition are achieved.

By the composition as described above, the composition of the present invention has a coefficient of thermal expansion of 77 × 10 ^-7 / ℃ to 84 × 10 ^-7 / ℃ in the temperature range of 50 to 350 ℃, and a dielectric constant of 10 to 20 It is characterized by having.

At least one selected from LiO ₂ , NaO ₂ , and KO ₂ may be added in an amount of 15 wt% or less in order to reduce the firing temperature in a fixed state as described above.

In addition, in order to finely adjust the dielectric constant, the coefficient of thermal expansion, and the transition point, it is preferable to add at least 5 wt% of at least one selected from TiO ₂ , MgO, BaO, SrO, CaO, and P ₂ O ₅ . .

On the other hand, in order to suppress the electrode reactivity with the Ag electrode to prevent coloring, any one or more selected from transition elements CoO, CuO, Cr ₂ O ₃ , MnO, FeO, NiO may be added in an amount of 1 wt% or less. , At least one selected from among CeO ₂ , Er ₂ O ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ , which are volatile elements, may be added in an amount of 1 wt% or less.

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

The present invention relates to the composition of low-temperature fired dielectric materials for PDPs that can be fired at 520 ° C. or lower. This composition is applicable to all PDP materials (transparent dielectric, bulkhead, white back, seal material, etc.), and can be applied to other display panels.

The basic three component system of the composition of the present invention is Bi ₂ O ₃ , SiO ₂ , Al ₂ O ₃ and B ₂ O ₃ . Since the dielectric material of the PDP acts as a capacitor, the dielectric constant of each material is very important.

According to the dielectric constant, an appropriate thickness of the layer to be laminated must be set, and the thickness of the layer affects the discharge voltage, permeability and the like of the panel.

Matching of thermal expansion with the substrate is also important. When the dielectric composition is laminated on the substrate, thermal expansion occurs during the firing process. If the thermal expansion exceeds a predetermined range from the glass used for the substrate, cracks are generated in the layer manufactured using the dielectric. Or other problems may occur.

In addition, it is not possible to increase the content of a specific element unconditionally by increasing the content of a specific element that can reduce the firing temperature to meet the respective requirements because the dielectric constant / coefficient of thermal expansion changes.

According to the composition experiment, the composition region that satisfies the three conditions of the firing temperature, the dielectric constant, and the coefficient of thermal expansion (linear expansion coefficient) was found and the unit membrane was evaluated to confirm that it can be used as a low-temperature baking material.

Table 1 below shows examples of compositions obtained through composition experiments.

The composition region is Bi ₂ O _{3 is} added to 55 to 80 wt%, B ₂ O _{3 is} added to 10 to 30 wt%, Al ₂ O _{3 is} added to 4 to 10 wt%, 4 to 10 wt% is added SiO ₂ .

In such a composition, the dielectric constant has a value of 10-20.

In addition, the thermal expansion coefficient of the composition as described above has a value of 77 × 10 ^-7 / ℃ to 84 × 10 ^-7 / ℃ in the temperature range of 50 to 350 ℃.

As described above, a substance for preventing crystallization, fine control of the firing temperature, and inhibiting coloring by electrode reaction may be added.

The electrode reaction is usually a problem when the electrode is Ag, a phenomenon in which the Ag reacts with the dielectric, the substrate, etc., the coloring effect appears.

In addition, in order to fine-tune the dielectric constant, thermal expansion coefficient, and the transition point, an additive of any one or more of TiO ₂ , MgO, BaO, SrO, CaO, and P ₂ O ₅ may be included.

The transition point refers to a temperature at which the volume changes abruptly. Generally, the glass is a supercooled liquid, and when the temperature is increased for calcination, the glass is changed into a liquid.

Therefore, if the transition point is low, the firing temperature can be lowered, and the softening point is also controlled low.

As shown in Table 1, even when LiO ₂ is not included in Compositions 1 and 2, a firing temperature of 520 ° C. or less can be obtained.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the present invention is not limited to the above embodiment, various modifications are possible, and various embodiments of the technical idea are all protected by the present invention. It belongs to the scope.

The present invention as described above can be baked at a low temperature to prevent deformation of the substrate or to be applied to soda-lime glass substrate, the dielectric constant is improved to control the thickness of the dielectric layer, can reduce the process time, multi-sided process There is an effect that can be responded to.

Claims (11)

Bi ₂ O ₃ added with 55 to 80 wt%; 10 to 30 wt% of B ₂ O ₃ added; 4-10 wt% of Al ₂ O ₃ added; SiO ₂ added with 4 to 10 wt%; At least one selected from LiO ₂ , NaO ₂ , and KO ₂ comprises a dielectric layer formed of a composition comprising an additive added at 15 wt% or less. The plasma display panel of claim 1, wherein at least one selected from TiO ₂ , MgO, BaO, SrO, CaO, and P ₂ O ₅ is added at 5 wt% or less. delete The plasma display panel of claim 1, wherein at least one selected from CoO, CuO, Cr ₂ O ₃ , MnO, FeO, and NiO is added in an amount of 1 wt% or less. The plasma display panel of claim 1, wherein at least one selected from CeO ₂ , Er ₂ O ₃ , Nd ₂ O ₃ , and Pr ₂ O ₃ is added in an amount of 1 wt% or less. According to claim 1, wherein the composition has a thermal expansion coefficient having a value of 77 × 10 ^-7 / ℃ to 84 × 10 ^-7 / ℃ in the temperature range of 50 to 350 ℃, and a dielectric constant of 10 to 20 Plasma display panel. Bi ₂ O ₃ added with 55 to 80 wt%; 10 to 30 wt% of B ₂ O ₃ added; 4-10 wt% of Al ₂ O ₃ added; A plasma display panel comprising a dielectric layer formed of a composition consisting essentially of SiO ₂ added at 4 to 10 wt% and comprising LiO ₂ added at 15 wt% or less as an additive. The dielectric paste of claim 1, further comprising any one or more of a solvent, a binder, and a dispersant. A dielectric green sheet comprising the composition of claim 1. A plasma display panel comprising at least one of a partition wall, a white bag, and a seal material formed of the composition of claim 1. Bi ₂ O ₃ added with 55 to 80 wt%; 10 to 30 wt% of B ₂ O ₃ added; 4-10 wt% of Al ₂ O ₃ added; SiO ₂ added with 4 to 10 wt%; LiO ₂ , NaO ₂ , KO ₂ A composition for a dielectric comprising an additive which is added at 15 wt% or less.

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