Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Structure for Self Shift AC Gas Panel Display

IP.com Disclosure Number: IPCOM000084347D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 61K

Publishing Venue

IBM

Related People

Barrakette, ES: AUTHOR [+2]

Abstract

One particular difficulty that may be encountered in the construction of AC self-shift gas display panels, such as that described by McDowell, et al in U. S. Patent 3,795,908, is the topological requirement of connecting many distributed electrical conductors, deposited on the inner surface of each plate of the panel, to a small number of sources of electrical potential, typically three or four for each plate of the panel structure.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Structure for Self Shift AC Gas Panel Display

One particular difficulty that may be encountered in the construction of AC self-shift gas display panels, such as that described by McDowell, et al in U. S. Patent 3,795,908, is the topological requirement of connecting many distributed electrical conductors, deposited on the inner surface of each plate of the panel, to a small number of sources of electrical potential, typically three or four for each plate of the panel structure.

Under such conditions, it is topologically impossible for some groups of conductors to be connected without crossing over or bridging other groups of conductors. This presents a problem of making simple crossovers or bridges while, at the same time, maintaining electrical isolation between the crossover conductors. This problem is illustrated schematically in Fig. 1.

Phase lines 1, 2 and 3 in Fig. 1 are coupled to three sources of electrical potential which are required to implement a self-shift panel, with a 3-phase voltage drive. As is evident, a 4-phase drive would require an additional set of electrical crossovers which ordinarily would be disposed on the lower edge of the display panel, as shown in Fig. 1, in the same manner as illustrated at the top edge of the figure for the 3-phase case. The display region 4 of the panel is depicted between the upper and lower broken lines shown in Fig. 1.

The arrangement shown in Fig. 2 represents an improved arrangement for simply effecting electrical crossovers on the panel plate. For simplicity only, the top portion of a full panel plate utilizing a 3-phase drive is shown. The 3-phase metallurgy pattern is shown by conductive metal lines 5a-5f, 6a-6f and 7a-7f, respectively. This metallurgical pattern may be produced by any of the variety of means utilized for this purpose in gas panel fabrication. For example, photolithography and etching of evaporated metal, direct metal deposition through a metal mask, or silk screening and firing of metal patterns may readily be employed for this purpose.

All of the metal lines shown in Fig. 2 are applied to the panel substrate plate (such as plate glass) in one step or one series of steps. As can be seen, metallurgical lines 6a-6f, which may, for example, correspond to phase 2, terminate in a pad or region of wider metal than the connecting metal lines of the other phases. As shown, the pads are...