source:other news release time:2022-11-04 Hits: Popular:led screen wholesaler
STB latch signal: the data in the shift register is sent to the latch, and its data content is displayed on the led through the drive circuit. However, as the drive circuit is controlled by the EN enable signal, its lighting must be in the enable state. The latch signal also needs to be coordinated with the clock signal to display a complete image. In any case, when the latch signal is abnormal, the whole board will display disorderly.
CLK clock signal: the shift pulse provided to the shift register. Each pulse will cause the data to move in or out of a bit. The data on the data port must be coordinated with the clock signal to transmit data normally. The frequency of the data signal must be 1/2 times that of the clock signal. In any case, when the clock signal is abnormal, the whole board will display disorderly.
EN enable signal: the brightness control signal of the whole screen is also used for display blanking. The brightness can be controlled by adjusting its duty cycle. When the enable signal is abnormal, the whole screen will not be bright, dark, bright or trailing.
Data signal: provide data required for displaying images. It must be coordinated with the clock signal to transmit data to any display point. Generally, red, green and blue data signals are separated in the LED display screen. If a data signal is short circuited to the positive or negative pole, the corresponding color will be fully lit or not lit. When the data signal is suspended, the corresponding color display is uncertain.
ABCD line signal: It only exists when dynamic scanning is displayed. ABCD is actually a binary number, and A is a low bit. If binary is used to represent ABCD signal control *, the range is 16 lines (1111). In 1/4 scanning, only AB signal is needed, because AB signal represents 4 lines (11). When the line control signal is abnormal, display dislocation, highlight or image overlap will occur.
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