Several common signals of led display

　　During the installation and use of LED display screen, different signals will always appear, which is equivalent to the unique language of LED display screen. The signal transmission problems of LED display screen occur from time to time. What's the meaning of these signals? Here are some specific signals in the LED display, mainly as follows:

　　1. 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.

　　2. STB latch signal: send the data in the shift register to the latch, and display its data content by turning 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.

　　3. 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.

　　4. 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 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.

　　5. ABCD line signal: It only exists when dynamic scanning is displayed. ABCD is actually a binary number, and A is the lowest bit. If binary is used to represent ABCD signal, the maximum control range is 16 lines (1111). In 1/4 scanning, only AB signal can be used, because the representation range of AB signal is 4 lines (11). When the line control signal is abnormal, the display will be misplaced, highlighted or the image will overlap.

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