1.OE enable signal: the control signal in the whole screen, but also often used for the entire screen blanking, we only need to master this enable signal, adjust its duty cycle, we can freely control the brightness Bigger. When this signal appears abnormal, the led screen will appear on the screen is not bright or dark phenomenon occurs.
ABCD line signal: This kind of signal only exists when the dynamic scan, ABCD is actually a binary number of the code, A is the lowest bit, if we use the binary identification ABCD line signal control the maximum range that is 16 lines 1. If this signal is abnormal when, then the led screen image will appear overlap, highlight or display dislocation occurred.
3.CLK clock signal: shift pulse supplied to the shift register, each pulse signal will cause the data to move out or into a bit. The data on the data port must be coordinated with the always-on signal to properly transmit the data we are about to transmit. The frequency of the data signal must also be half the clock signal. When the signal appears a time, the led display will appear full-page display messy situation.
