Introduction of common signals of LED display

Different signals will always appear during the installation and use of LED display screens, which is equivalent to the unique language of LED display screens. Signal transmission problems of LED display screens occur from time to time. What is the meaning of these signals? If at a major opening ceremony, the LED display suddenly appears garbled due to signal problems, the impact will be irreparable. If you can figure out these signals, it will be much easier to read your LED display. Let's take a look at some of the unique signals in the LED display. The main ones are as follows:

1. CLK clock signal: the shift pulse provided to the shift register, each pulse will cause the data to shift in or out by one bit. The data on the data port must be coordinated with the clock signal to transmit the data normally. The frequency of the data signal must be 1/2 times the frequency of the clock signal. In any case, when the clock signal is abnormal, it will make the whole board display disorderly.

2. STB latch signal: send the data in the shift register to the latch, and display the data content through the drive circuit lighting LED. However, since the drive circuit is controlled by the EN enable signal, the prerequisite for its lighting must be that the enable is in the on state. The latch signal also needs to be coordinated with the clock signal to display a complete image. In any case, when there is an abnormality in the latch signal, the entire board will be displayed disorderly.

3. EN enable signal: the brightness control signal of the whole screen, also used for the blanking of the display screen. Just adjust its duty cycle to control the change in brightness. When the enable signal is abnormal, the whole screen will appear unlit, dark or trailing.

4. Data signal: provide the data needed to display the image. It must be coordinated with the clock signal to transfer the data to any display point. Generally, the red, green and blue data signals are separated in the display screen. If a data signal is short-circuited to the positive or negative electrode, the corresponding color will appear full or not bright. When the data signal is suspended, the corresponding color display The situation is uncertain.

5. ABCD line signal: only exists during dynamic scanning display, ABCD is actually a binary number, A is the lowest bit, if the binary representation of ABCD signal control the maximum range is 16 lines (1111), as long as the AB signal in 1/4 scan That ’s all, because the AB signal has a range of 4 lines (11). When the line control signal is abnormal, there will be display misalignment, highlighting or overlapping images.

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