Browse Prior Art Database

AC Self Shift Gas Panel Structure

IP.com Disclosure Number: IPCOM000086561D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 37K

Publishing Venue

IBM

Related People

Hall, JJ: AUTHOR

Abstract

This AC self-shift gas-discharge display panel permits construction without the necessity for having the gaseous discharges confined by glass channels. This is achieved by the use of MgO strips to confine the shifting discharges to desired paths in the direction of shift.

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AC Self Shift Gas Panel Structure

This AC self-shift gas-discharge display panel permits construction without the necessity for having the gaseous discharges confined by glass channels. This is achieved by the use of MgO strips to confine the shifting discharges to desired paths in the direction of shift.

One advantage of AC self-shift gas discharge display panel devices, such as the PLASMAC* II shift panel or the IBM AC self-shift gas panel (e.g., U.S. Patent 3,795,908), is that they do not require conductor crossovers in their construction. In particular, for a horizontally shifting display, such as the PLASMAC II panel, for example, only vertical conductors on the front and back plates are utilized, which conductors are driven by a four-phase shifting arrangement familiar to those skilled in the art. In order to prevent the discharges from spreading in the vertical direction, horizontal channels are fabricated in the gas space, one for each line of display information. These channels isolate the discharges on any given horizontal line from the gas spaces of the adjacent horizontal lines. Typically, these channels are fabricated by screening opaque glass strips on one plate having the thickness of the desired gas gap. However, there are several disadvantages to fabricating panels using these techniques. For example, the panels so constructed exhibit limited resolution due to the use of the screening process. Moreover, an additional screening and firing step is required in the construction of the panel.

As proposed here, AC self-shift gas panel structures are constructed so that the lines or strips of secondary electron emission material, such as MgO, act to confine the shifting discharges to the desired paths in the direction of self shift. In accordance with such an arrangement, the screened glass physical barriers used in the prior art are unnecessary.

As shown in the figure, the vertical conductor patterns 1 and 3 may be fabricated on glass plates 5 and 7 using conventional...