According to the process and the aluminum plate and the anti-luminous.
5) LED (Display): The earliest to do with the display and digital display used
By shape: 1, 2, 3, 4, etc.
Surface color: gray vinyl surface, but also have a black face white plastic, etc.
Polarity: common cathode, common anode
The same color and the LED can do many kinds.
6) matrix (LEDDotMatrix): This product and digital control are similar applications in the information displayed. Their spacing and diameter of the holes are different products have changed, and now generally divided into 5 * 7 and 8 * 8, and its colors are monochrome, color, three-color and so on.
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