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Gas Panel Metallurgy Testing Apparatus

IP.com Disclosure Number: IPCOM000089753D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Murphy, JA: AUTHOR [+4]

Abstract

In gas panel fabrication, an array of conductors are formed on glass plates and the conductor arrays overcoated with a dielectric layer, two plates then being sealed with the conductors orthogonal to each other, the display cells being defined by the intersection of the conductors. In fabricating such devices, it is essential that the conductor arrays be tested both before and after the dielectric coating is applied to ensure that any opens or shorts are detected and repaired, or the plate discarded. In such testing, it is desirable to provide a visual identification of the shorts or opens to thereby facilitate their repair.

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Gas Panel Metallurgy Testing Apparatus

In gas panel fabrication, an array of conductors are formed on glass plates and the conductor arrays overcoated with a dielectric layer, two plates then being sealed with the conductors orthogonal to each other, the display cells being defined by the intersection of the conductors. In fabricating such devices, it is essential that the conductor arrays be tested both before and after the dielectric coating is applied to ensure that any opens or shorts are detected and repaired, or the plate discarded. In such testing, it is desirable to provide a visual identification of the shorts or opens to thereby facilitate their repair.

An electrochemical method for detecting and identifying both shorts and opens in individual lines of gas panel plates operates as follows. In the preferred embodiment, alternate lines are driven from opposite sides of the panel via a terminal pad, and each line additionally utilizes a repair pad in each side thereof. One end of the plate is dipped into a solution of KMnO(4)(60 grams/liter) to cover all the pads on one end of the plate, and a current of 50 to 100 ma is applied to the opposite end of the contact pads which are not immersed for a period of 15 to 30 seconds. The negative electrode is connected to the nonimmersed end of the contact pad while the positive electrode will be connected either to a metal tray, if used, or to the positive pole during the test. All metal which is electrically connec...