Abstract :
The basic properties of electroluminescence are first discussed and the paper then describes the construction of ¿organic-on-glass¿ and ¿ceramic-on-metal¿ lamps. Typical performance figures for these lamps as given. A description of the various types of alpha-numeric indicators that have been proposed follows. In particular, the ¿8-bar¿ digital indicator, and its variants, is compared with other types not requiring coding. Types of alphabet indicator are also discussed.
