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LED the common devices are 2 class, digital and lattice,
1: digital tube
A digital tube used generally 8 fonts, divided into a B C D, E, F G, P bits for P decimal point
B, digital pipe commonly have 10 tube feet (units), each segment of a tube feet, two other tube feet for public, 2 is
C, ranging in size from the points of a lot of more phyletic, commonly have 0.3 0.5 0.8 1.0 1.2 1.5 1.8 2.3 3.0 4.0 5.0, etc
D, usually less than 1.0 for single chip, (a) has double 1.0, 1.2 ~ ~ 1.5 for double tube, 1.8 above for more than three core tube, their power supply voltage, general each different requirements for the clearance of pressure drop around 2.1 v
My experience is below the power supply, 0.8 5-v 1.0 ~ 2.3 for higher than 12v and 3.0
E, Yin and Yang of points of two

2: the bitmap
A matrix, used for 8 * 8, 5 * 8 (now have not used),
B, bitmap is single chip, points (do) of Yin and Yang (lines), usually with total power. 5v
C, 8 * 8 bitmap for 16 tube feet (monochrome, also has 24, may be voided double-color matrix or to the same kind of PCB realize double color is designed, also can compare common),
8 do 8 green
Double for 24 feet, eight root canal, eight columns, 8 red list green,