Classification of LED display 
 1, according to the color-color can be divided into single-color display: Single color (red or green). Dual-color display: red and green dual-color, 256 gray, you can display 65,536 colors. Full color display: red, green, blue color, 256 gray level display can show full color more than sixteen million kinds of colors. 
 2, according to display category LED digital display: 7 segment display digital code, suitable for production of the clock screen, screen, and other interest rates, display digital electronic display. LED dot matrix graphic display: display device is composed of many evenly composed of light emitting diode dot matrix display modules, suitable for broadcast text, image information. LED video display: display device is composed of many light-emitting diodes that can display video, animation and other video files. 
 3, by using the occasion categories indoor display: small light-emitting points, the general Φ3mm - Φ8mm, shows the general area of a few to more than ten square meters. Outdoor display: the general area of tens of meters to several hundred square meters, high brightness, can work in the sun, with wind, rain, water resistant. 
 4, according to classification of light spot diameter and spacing of the indoor screen (by diameter points): Φ3mm, Φ3.75mm, Φ5mm, room external screen (divided by distance): PH10, PH12, PH14, PH16, PH20, PH25, PH31.25, PH37 .5 ...... 5. display a static, horizontal scrolling, vertical scrolling and page display. Monolithic module control drive 12 (to control up to 24) 8X8 matrix of 16X48 matrix (or 32X48 dot matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 and 8279, and the like LED display driver module) 12 times (or 24 times)! Can be "cascade" approach composed of any large dot matrix display. Showed good results, low power consumption, and cost than using a lower MAX7219 circuit.