LED display often has different signals during installation and use, which is equivalent to the language of LED display. If you can figure out these signals, it will be much easier to read your LED display. The meaning of the common signals of LED display screens is compiled, and the LED display screen can be further understood by people inside and outside the industry.
EN enable signal: Full screen brightness control signal, 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.
ABCD line signal: only exists in dynamic scan display, ABCD is actually a binary number, A is the lowest bit. If the ABCD signal is controlled by binary, the maximum range is 16 lines (1111). As long as the AB signal is 1/4 scan, 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.
CLK Clock Signal: A shift pulse that is 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.
Data signal: Provides the data needed to display an 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.
STB latch signal: The data in the shift register is sent to the latch, and its data content is displayed by the drive 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.
Absolute rotary Encoder measure actual position by generating unique digital codes or bits (instead of pulses) that represent the encoder`s actual position. Single turn absolute encoders output codes that are repeated every full revolution and do not output data to indicate how many revolutions have been made. Multi-turn absolute encoders output a unique code for each shaft position through every rotation, up to 4096 revolutions. Unlike incremental encoders, absolute encoders will retain correct position even if power fails without homing at startup.
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