LED display will always appear in different signal installation and use, the equivalent of the LED display unique language, signal transmission problems have occurred LED display, the emergence of these signals what does that mean? 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. Here are some specific signals in the LED display. The main ones are as follows:
1. CLK clock signal: A shift pulse supplied to the shift register, each pulse will cause data to be shifted in or out of 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, the whole board will be displayed in a disorderly manner.
2. STB latch signal: The data in the shift register is sent to the latch, and its data content is displayed by the driving circuit lighting LED. However, since the drive circuit is controlled by the EN enable signal, the premise of the illumination must be that the enable state is enabled. The latched signal also needs to be coordinated with the clock signal to display the complete image. In any case, when the latch signal is abnormal, the whole board will be displayed in a mess.
3. EN enable signal: The full screen brightness control signal 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 appear unlit, dark or trailing.
4. Data signal: Provides the data needed to display the image. It must be coordinated with the clock signal to transfer the data to any of the display points. Generally, the red, green and blue data signals are separated in the display. If a data signal is short-circuited to the positive or negative pole, the corresponding color will appear full or no light. When the data signal is suspended, the corresponding color is displayed. The situation is uncertain.
5.ABCD line signal: only exists in the dynamic scan display, ABCD is actually a binary number, A is the lowest bit, if the binary display ABCD signal control maximum range is 16 lines (1111), as long as AB signal in 1/4 scan That's it, because the representation range of the AB signal is 4 lines (11). When an abnormality occurs in the line control signal, misalignment, highlighting, or image overlap will occur.
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