Black conductive thick film compositions, black electrodes, and methods of forming thereof

a thick film composition and black conductive technology, applied in the field of black conductive compositions and black electrodes, can solve the problems of lack of detailed description regarding composition and conten

Inactive Publication Date: 2008-07-03
BAKER MICHAEL F +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides a black electrode with excellent balance of properties, including low contact resistance, high blackness, and reduced reflection of external light, while being environmentally friendly by eliminating lead and cadmium.

Problems solved by technology

However, the compositions of this literature do not contain conductive materials such as ruthenium oxide, and glass powder is not an essential component.
However, there is no detailed description regarding the composition, content, etc. of the crystallized glass, and the subject is not a lead-free glass composition.

Method used

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  • Black conductive thick film compositions, black electrodes, and methods of forming thereof
  • Black conductive thick film compositions, black electrodes, and methods of forming thereof
  • Black conductive thick film compositions, black electrodes, and methods of forming thereof

Examples

Experimental program
Comparison scheme
Effect test

application examples 24

and Controls 5-12

[0184]In order to evaluate the reproducibility of the contact resistance performance of black paste 3 (based on Bi frit C). Black paste 3 was tested in a 2-layer structure with 3 more Ag pastes, (Ag-2, Ag-3 and Ag-4. Examples 2, 3, and 4 respectively). In examples 2-4 the length of the profile was increased to 2.5 hrs (verses 1.5 hrs for example 1).

[0185]Black pastes 1,2,4 and 5 (used in controls 1-4 above) and black paste 6 (based on Bi frit E) was also included for comparison. (Controls 5-12)

Results

[0186]The results are shown in Table 9.

TABLE 9Set No.Control 5Control 6Example 2Control 7Control 8Ag paste: Ag-2Ag Description: Ag 69 wt %Bi Frit A: 3 wt %Black pasteBlack-1Black-2Black-3Black-6Black-4Black DescriptionBi Frit ABi Frit DBi Frit CBi Frit EBi Frit BOhmic Rfire2514193528@580 C. × 2.5 hx1fire1003726264170x2fire6847424184274x3Set No.Control 9Example 3Control 10Control 11Control 12Example 4Ag pasteAg-3Ag-4Ag DescriptionAg: 69 wt %Ag: 69 wt %Bi Frit B: 3 wt %Bi...

application examples 5-11

and Controls 13-15

[0189]The purpose of examples 5-11 and controls 13-15 was to investigate if Bi-frit C (which performs well in examples 1-4 above) can be blended with Bi-frit D (which did not perform well in controls above) to give black paste compositions with acceptable ohmic resistance performance.

examples 5-11

, and controls 13-15 were fired using a 1.5 hr long profile.

Results

[0190]The results are shown in Table 10.

TABLE 10ExampleExampleSet No.Example 5Example 6Example 7Example 8Control 13Example 91011Control 14Control 15AgAg-3Ag-5Ag DescriptionAg: 69 wt %Ag: 69 wt %Bi Frit B: 3 wt %Bi Frit B: 3 wt %Black powder A: 1 wt %BlackBlack-10Black-11Black-12Black-13Black-14Black-10Black-11Black-12Black-13Black-14Black DescriptionBi Frit CBi Frit CBi Frit CBi Frit CBi Frit CBi Frit CBi Frit CBi Frit CBi Frit CBi Frit C10075502501007550250Bi Frit DBi Frit DBi Frit DBi Frit DBi Frit DBi Frit DBi Frit DBi Frit DBi Frit DBi Frit D02550751000255075100resistivity / mohm / sq@5 um6.76.96.77.47.17.07.07.37.17.5Ohmic Rfire x17777777766fire x211152032431312245576fire x31420283251161630143173dried Black thickness / um4.34.34.04.04.14.34.34.04.04.1dried Ag / Black thickness / um9.810.09.89.610.010.010.09.79.69.5fired thickness / um3.84.03.54.03.93.73.63.63.93.5edge curl / um2.11.61.51.71.92.01.92.01.51.8L-color for Ag / Blac...

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Abstract

The present invention provides a method for forming a black electrode by performing sintering at a temperature in the range of 500-600° C. after applying a lead-free black conductive composition to a substrate. The aforementioned black electrode comprises a binder comprising a crystallized glass component. The aforementioned black conductive composition comprises conductive particles of black RuO2, lead-free black ruthenium-based polyoxide, and mixtures thereof in an amount of 4-30 wt %, based on the total weight of the composition, a lead-free non-conductive black oxide in an amount of 0-30 wt %, based on the total weight of the composition, and a lead-free bismuth-based glass binder in an amount of 10-50 wt %, based on the total weight of the composition.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 659,839 filed Mar. 9, 2005.FIELD OF THE INVENTION[0002]The present invention is directed to black conductive compositions, black electrodes made from such compositions and methods of forming such electrodes, more specifically the present invention is directed to the use of such compositions, electrodes, and methods in flat panel display applications, including alternating-current plasma display panel devices (AC PDP). The invention is further directed to AC PDP devices themselves.BACKGROUND OF THE INVENTION[0003]While the background of the present invention is discussed in terms of plasma display panel (PDP) applications, it is understood that the present invention is useful in flat panel display applications, in general.[0004]The PDP typically comprises a pair of forward and backward insulation substrates arranged in opposition to each other to form a plurality of ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H01B1/08B05D5/12
CPCC03C8/14C03C8/16H01J2211/225H01J9/02C03C17/04C03C8/18C03C8/22H01J11/12H01J11/24H01J11/44H01J2211/444
InventorBAKER, MICHAEL F.HAYAKAWA, KEIICHIROMATSUNO, HISASHI
OwnerBAKER MICHAEL F