The full-color display unit board is mainly composed of column tube constant current chip, line tube driver chip, data buffer chip, and part of the line tube integrated 3-8 decoding function, or serial decoding function. According to the actual application, LED monochrome display, LED dual color display and LED full-color display can be designed.
TM5020A is a conventional general-purpose column tube constant current chip, which converts serial input data into parallel output data format. With 16 current source output ports, each port provides 3~36mA constant current amount to drive LEDs, and the ports can be shorted to get larger current output when the environment changes, which has little effect on its output current. Therefore, it can precisely control the luminous brightness of LEDs, and is suitable for high quality white balance display driver modules. The application areas are mainly outdoor LED advertising screen, semi-outdoor doorstep screen, indoor LED display, LED bus stop display and various LED advertising billboards.