The electroluminescent matrix for pattern display and recording

Construction techniques for electroluminescent matrix systems, namely photographic etching and vacuum evaporation through masks, are described in detail. A method of extending the lifetime of electroluminescent layers is put forward which offers easier construction of the electroluminescent device. Selection problems in electroluminescent matrix systems are considered. Electro-mechanical systems are shown to be very slow and a description is given of a high-speed, economical, electronic selection system, which may use either valves or transistors.