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(ssr) slotted optical switch, opto switch, optical switch led display – seven-segment display , sixteen-segment display , dot-matrix display display technologies[ edit ] current: filament lamp (indicator lamp) vacuum fluorescent display (vfd) (preformed characters, segment , starburst) cathode ray tube
generates its own light, can be made flexible or transparent) micro-led (similar to oled, but uses inorganic leds instead of organic ones, does not suffer from screen burn-in , however it cannot be made flexible or transparent) obsolete: incandescent filament segment display (aka ' numitron ') nixie tube...
https://en.wikipedia.org/wiki/Discrete_device