Led display as a high-tech products caused a high degree of attention, the use of computer control, optical, electrical integration of intelligent full color display has been widely used in the field. Its pixels using led light-emitting diodes, many light-emitting diodes to lattice arrangement, constitute a led array, and then constitute the led screen. Powerful giant color that through different led drive, you can get different effects of the image. So the advantages of led driver chip, led display display quality plays an important role. Led driver chip can be divided into general-purpose chips and dedicated chips.
General chip is generally used for led display of low-end products, such as indoor single, two-color screen. The most commonly used general-purpose chip is 74hc595, with 8-bit latch, serial shift register and tri-state output function. Each channel can output up to 35ma non-constant current current.
As led by the current characteristics of the device, that is, under the premise of saturation conduction, the brightness changes with the size of the current changes, not with the voltage changes at both ends of the change. Dedicated chip is the biggest feature is to provide constant current source output, to ensure stable led drive, eliminating the flashing led display. With the output current, constant current and other characteristics, suitable for demanding high-current, high-quality occasions, such as outdoor full color, indoor full color and so on.