ABSTRACT
A lighthouse is an example of emission. Whereas its light can be easily seen at night, it is barely visible in bright daylight. Examples of emission-based displays are CRTs (see section “Cathode Ray Tube”) electroluminescent displays (see section “Electroluminscent Displays”), and cathodoluminescent displays (see section “Cathodoluminescent Displays”). Similar to a lighthouse, these displays need to be brighter than the ambient light to be perceived properly.
