A new alpha-numeric display device using cold cathode glow discharge

Development of a unique alpha-numeric display is achieved with a device incorporating several new techniques in an unusual construction. This paper discusses the human engineering aspects, choice of materials, fabrication, processing and manner of evaluation. The abnormal glow characteristics of a cold cathode, neon gas discharge are used in presenting an alpha numeric display of high light intensity. Thirteen cathode segments are mounted "on edge" providing a single plane display with a wide viewing angle and a character shape which is continuous rather than sharply segmented. The continuity of stroke is achieved by utilizing the "glow overlap" phenomena. Sputtering of the cathode material in the abnormal glow region is a function of the gas, pressure, and cathode material. Shielding precautions required to overcome the problem of sputtering are described. Also discussed are: 1) Techniques to obtain ultra long life. 2) Effect of spacing variation on cathode glow uniformity, and 3) Evaluation of the tube in terms of its application.