Browse Prior Art Database

Reduction of Vertical Line Drivers Required

IP.com Disclosure Number: IPCOM000089123D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Lamoureaux, WR: AUTHOR [+2]

Abstract

For certain applications of gaseous discharge displays, it is desirable to operate at a frequency above that at which the wall charge phenomenon takes place, and utilize a memory refresh buffer. As in conventional gaseous discharge devices, one of the attendant problems is the number of vertical drivers required, particularly where a single line of a substantial number of characters such as a single line 80-character all points addressable display is utilized. Another problem associated with conventional gaseous discharge devices is the multilayer conductor fabrication, such as chrome-copper-chrome, the copper layer comprising the conductor and the chrome layers providing adherence to glass and conductor protection.

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Reduction of Vertical Line Drivers Required

For certain applications of gaseous discharge displays, it is desirable to operate at a frequency above that at which the wall charge phenomenon takes place, and utilize a memory refresh buffer. As in conventional gaseous discharge devices, one of the attendant problems is the number of vertical drivers required, particularly where a single line of a substantial number of characters such as a single line 80-character all points addressable display is utilized. Another problem associated with conventional gaseous discharge devices is the multilayer conductor fabrication, such as chrome-copper-chrome, the copper layer comprising the conductor and the chrome layers providing adherence to glass and conductor protection. This article proposes that one set of vertical drivers corresponding to half the number of lines be utilized for the vertical drivers, and that the horizontal conductors be formed of a single resistive material, such as chrome, providing savings both in fabrication and associated electronics. Such a system is constructed and operated in the following manner.

Referring to the figure, the number of cells in the horizontal direction is arbitrarily divided into two groups designated Group I and Group II. In the embodiment herein described, each group is shown to consist of three cells on a single line, although it will be appreciated that in practice a single line 80- character display using 5 x 7 character matrices is contemplated, requiring a total of 400 individual vertical drive lines, each group consisting of 200 drive lines. The resistive horizontal driv...