The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1982
Filed:
Apr. 02, 1980
Burkhard Littwin, Hohenschaeftlarn, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A gas discharge display device has a hermetically sealed gas filled envelope having an anode plate on one interior side and a profiled cathode on an opposite interior side. A control plate having a conductor matrix thereon formed of row conductor runs on one side and column conductor runs on an opposite side with perforations in the plate disposed at row-column intersections is disposed inside the envelope parallel to the anode and cathode and divides the interior of the envelope into a post-acceleration area near the anode and a discharge area near the cathode. The cathode profile is a plurality of spaced ribs disposed parallel to at least one set of conductor runs on the control plate. Upon cathode energization, gas electrons are ionized on that part of the cathode confined by neighboring ribs and opposite to air charged conductor on the control plate and subsequently drawn to the anode plate through the matric holes to display a point-form image. By confining the gas discharge to the vicinity of a small number of conductor rows, unwanted background luminosity is substantially minimized on the display screen.