Dielectric material for plasma display panel

A technology of dielectric materials and display panels, applied in circuits, discharge tubes, electrical components, etc., to achieve the effect of excellent transparency

Inactive Publication Date: 2009-08-12

NIPPON ELECTRIC GLASS CO LTD

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Problems solved by technology

[0007] In addition, since the transparent dielectric layer is required to have high transparency in addition to the above characterist...

Method used

As mentioned above, the dielectric material of the present invention is coated or configured on the glass substrate formed with electrodes, fired, and the dielectric layer is formed, so that the yellowing of the dielectric layer caused by Ag is less, and the present invention having excellent transparency can be obtained. Invented glass plate for plasma display panels.

Usually, in ZnO-B2O3 class non-lead glass, only add composition M in glass, although the valence number change of MX+Ag0→MX-1+Ag+ has taken place, because ZnO-B2O3 class non-lead glass The degree of yellowing is stronger than other ...

Abstract

A dielectric material for plasma display panels which comprises a lead-free glass powder and, despite this, gives a dielectric layer less apt to yellow, excellent in transparency, and having a coefficient of thermal expansion suitable for glass substrates, and can be burned at a temperature of 600 DEG C or lower. Also provided are a method of forming a dielectric layer and a glass plate for plasma display panels which is formed by that method. The dielectric material for plasma display panels comprises a ZnO/B2O3-based glass powder, and is characterized in that the glass powder contains substantially no PbO and comprises a glass containing, in terms of mass%, 46-80% of ZnO+B2O3, 0.3-10% of TiO2, and 0.01-6% of CuO+MoO3+CeO2+MnO2+CoO.

Application Domain

Solid cathode detailsCold-cathode tubes

Technology Topic

Plasma displaySurface plate +4

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Examples

Experimental program(1)

Example Embodiment

[0065] Example

[0066] Hereinafter, the dielectric material of the plasma display panel of the present invention will be described in detail based on embodiments.

[0067] Tables 1 to 5 show Examples (Sample Nos. 1 to 19) and Comparative Examples (Sample Nos. 20 to 26) of the present invention, respectively. In addition, sample No. 20 represents the ZnO-B 2 O 3 The material of the class composition.

[0068] Table 1

[0069]

[0070] Table 2

[0071]

[0072] table 3

[0073]

[0074] Table 4

[0075]

[0076] table 5

[0077]

[0078] Each sample in the table was prepared as follows.

[0079] First, the raw materials are mixed according to the glass composition shown in the table by mass% and mixed thoroughly. Next, the platinum crucible was put in and melted at 1300°C for 2 hours, and then the molten glass was shaped into a thin plate. Then, it was pulverized with a ball mill and classified by airflow to obtain an average particle size D 50 Below 3.0μm, maximum particle size D max A sample composed of glass powder below 20μm. Regarding the glass powder obtained in this way, the stability, thermal expansion coefficient, softening point, dielectric constant, and yellowing of the glass were evaluated.

[0080] As can be seen from the table, in the sample Nos. 1 to 19 of the examples, the raw materials were vitrified in the melting step, and it was confirmed that no crystals were precipitated in the glass at all. In addition, the coefficient of thermal expansion is 69.9~77.6×10 -7 /℃, matched with glass substrate, softening point is as low as 594℃, and can be fired at a temperature below 600℃. In addition, the dielectric constant is 6.8 to 10.0. Visual evaluation was performed for yellowing, and it was confirmed that there was no yellowing. In addition, in the evaluation using a color difference meter, a * Below +3.9, b * Below +19.9, confirm that there is no yellowing.

[0081] On the contrary, in the sample Nos. 20 and 21 of the comparative example, when the dielectric layer was formed on the Ag electrode, yellowing occurred in the periphery of the Ag electrode. Sample Nos. 22 and 23 changed color to brown. On the other hand, the dielectric material of sample No. 24 changed its color to dark blue. In sample No. 25, the raw material was vitrified in the melting step, and crystals were precipitated. In sample No. 26, the raw material was not vitrified in the melting step.

[0082] In addition, regarding the stability of the glass, in the table, the glass sample obtained by melting the raw material into a thin plate shape is observed with an optical microscope, the raw material is vitrified in the melting process, and it is confirmed that there is no crystal precipitation in the glass, which is indicated by [○]. In the melting process, the raw material is vitrified and crystallized, or the raw material is not vitrified in the melting process, indicated by [×].

[0083] Regarding the coefficient of thermal expansion, each sample was molded by powder compression, fired at 580°C for 10 minutes, and then ground into a cylindrical shape with a diameter of 4mm and a length of 40mm. It was measured in accordance with JISR3102 and found to be within the temperature range of 30 to 300°C. Value.

[0084] Regarding the softening point of the glass, it was measured using a Macro-type differential thermal analyzer, and the fourth inflection point value was taken as the softening point.

[0085] Regarding the electrical conductivity, each sample was molded by powder compression, fired at 580°C for 10 minutes, then ground into a 2 mm plate-shaped body, measured in accordance with JIS C2141, and the value at 25°C and 1 MHz was determined.

[0086] Regarding the evaluation of yellowing caused by Ag, the paste prepared as described above was applied by screen printing on a soda lime glass substrate on which Ag electrodes were formed to obtain a fired film with a thickness of about 30 μm, which was then dried. After firing at 580°C for 10 minutes, visually observe the periphery of the electrode and measure a with a colorimeter * And b *. In addition, a * The higher the value, the reddish color, a * If it is less than +5.0, it is judged that it does not change color, and b * The higher the value, the yellower the color, b * When it is less than +25.0, it is judged that there is no yellowing.

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Classification and recommendation of technical efficacy words

Good transparency

Dielectric material for plasma display panel

A technology of dielectric materials and display panels, applied in circuits, discharge tubes, electrical components, etc., to achieve the effect of excellent transparency

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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