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Sealing Exhaust Tubulation in Gas Panels

IP.com Disclosure Number: IPCOM000082122D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Foster, BJ: AUTHOR [+3]

Abstract

In the fabrication of gas panels, two substrates having dielectric coated conductors positioned orthogonal to each other are sealed around their edges, and the display device filled with gas through a glass tubulation. One of the problems in fabricating this device is the tubulation seal, which requires that the seal be made of a crystallizable glass applied to the tube in paste form and fired at about 450-480 Degrees C. This process results, however, in the transfer of volatile organics from the paste into the active area of the device causing the burn-in time to be excessive, and adding cost significantly to the panel manufacture. A method of inhibiting this problem is described.

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Sealing Exhaust Tubulation in Gas Panels

In the fabrication of gas panels, two substrates having dielectric coated conductors positioned orthogonal to each other are sealed around their edges, and the display device filled with gas through a glass tubulation. One of the problems in fabricating this device is the tubulation seal, which requires that the seal be made of a crystallizable glass applied to the tube in paste form and fired at about 450-480 Degrees C. This process results, however, in the transfer of volatile organics from the paste into the active area of the device causing the burn-in time to be excessive, and adding cost significantly to the panel manufacture. A method of inhibiting this problem is described.

Referring to the figure, a glass substrate 1 has an opening 2 to contain an exhaust tubulation 3. When the exhaust tubulation is in the opening 2, a glass sealant donut material 4 such as Corning 7575, already prefired to remove the organics, is slipped around the tubulation 3 and sealed at 480 Degrees C. The donut 4 is prefabricated by pressing the glass powder with a suitable binder such as Corning's vehicle or terpineol, and then prefiring at 360 Degrees C for 15 to 30 minutes to completely remove the organics.

A significant feature is that the donut 4 be of conical shape, which results in improved mechanical integrity of the panel. The process which involves sealing of a conical shaped prefired donut 4 to the tubulation 3 helps to improve th...