Browse Prior Art Database

Tester for Gas Display Panel

IP.com Disclosure Number: IPCOM000085080D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Anolick, ES: AUTHOR [+3]

Abstract

A gas panel has a set of x dimension wires and a set of y dimension wires that are spaced apart in an ionizable medium, to form light-emitting cells at their crossover points. A display pattern is maintained by an alternating voltage that is applied to all of the cells with an amplitude to sustain the ionization of a previously ionized cell, but not ionize a previously erased cell. The amplitude of this voltage is between two values called Vs max (where erased cells unintentionally ionize) and Vs min (where previously ionized cells erase).

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Tester for Gas Display Panel

A gas panel has a set of x dimension wires and a set of y dimension wires that are spaced apart in an ionizable medium, to form light-emitting cells at their crossover points. A display pattern is maintained by an alternating voltage that is applied to all of the cells with an amplitude to sustain the ionization of a previously ionized cell, but not ionize a previously erased cell. The amplitude of this voltage is between two values called Vs max (where erased cells unintentionally ionize) and Vs min (where previously ionized cells erase).

In this tester for Vs max and Vs min, a sustain voltage Vs is applied to an individual cell in a sequence to scan all of the cells of the display. At each cell, the amplitude of Vs is raised and lowered through the range in which values of Vs max and Vs min may occur. When an initially erased cell turns on as Vs is raised, the amplitude of Vs is recorded as the value of Vs max and the amplitude of Vs is slowly lowered. When the cell erases, the value of Vs min is recorded and the operation is stepped to the next cell.

The on or erased condition of the cell may be detected by a photo-detector and a lens that forms the image of the display on the detector. Alternatively, the lens system can form the image of a selected group of a small number of cells. One of the cells in the group is tested as already described, while selected other cells are kept on to better simulate the actual operating conditions...