An accurate electroluminescent graphical-output unit for a digital computer

The paper describes a graphical-output unit fabricated from a uniform layer of electroluminescent phosphor with 512 parallel conducting strips on either side, these respective sets of strips being mutually at right angles to form a matrix of conductors. The application of a changing electric field between selected strips of both sets causes the phosphor to fluoresce at their intersection. As intersections are selected in turn a pattern can be traced out on the panel and recorded photographically. The discrimination ratio of brightness of wanted to unwanted spot positions and an improved method of biasing the matrix are considered in some detail. Other factors, such as driving-voltage frequency, waveshape and intermittent operation, are considered as they affect the discrimination ratio. Details of some prototype matrices are given, and a display indicating the resolution of such a system is shown.