Browse Prior Art Database

Low Voltage Flat Panel Segmented Numeric Display

IP.com Disclosure Number: IPCOM000075722D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Haims, M: AUTHOR [+3]

Abstract

This device is a low voltage display structure fabricated by the use of printed circuit techniques.

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Low Voltage Flat Panel Segmented Numeric Display

This device is a low voltage display structure fabricated by the use of printed circuit techniques.

Glass structure 10 contains a plurality of phosphor coated, transparent segmented anode sets 12 for each numeric character that is viewable through the glass 10. The phosphor coated segmented anode sets 12 are activated from a source of electrons from cathode 14. Each cathode 14 corresponds to its respective numeric character set 12. A control grid 16 is interposed between the electron source 14 and the phosphor side of the anode segment 12. The entire structure is contained within a high-vacuum enclosure, not shown, with the individual leads from the anode sets brought out to a control means for selective energization of those phosphor segments that create a character. The leads 18 which are derived from the numeric segments, are all drawn off to common segment busses, not shown.

The device is fabricated by covering a conductive glass which is coated with tin oxide with a positive photoresist material. Then, the covered glass is exposed under a mask that represents the anode configuration for the numeric segments. Following this step, the unexposed material is washed away. By an etching process, the desired anode configuration remains as the only conductive region on the glass 10. Following the etching process, a phosphor material is utilized to cover the conductive areas that appear on the glass 10.

The configurati...