![]() Some included magnifying lenses onto the design in an attempt to make the digits more legible. ![]() 1970s) LED seven-segment displays had each digit built on a single die. Vacuum fluorescent display versions were also used in the 1970s. These worked similarly to modern LED segment displays. There were also segment displays that used small incandescent light bulbs instead of LEDs or incandescent filaments. Minitrons are filament segment displays that are housed in DIP packages like modern LED segment displays. A variation (minitrons) made use of an evacuated potted box. ![]() Some early seven-segment displays used incandescent filaments in an evacuated bulb they are also known as numitrons.
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