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Want to understand how the LED display works, first of all to figure out the direction of the various signals of the LED display, and secondly to further understand the operating principle of the LED display. The LED display mainly has five kinds of signals, and the cooperation of these signals completes the transmission of data and displays the operation. This article will introduce the effects of the five signals.
The LED display consists of three parts: the data acquisition system, the control system, and the display system. The direction of the data signal is: peripherals - computer - DVI graphics card - data transmission card - data receiving card - HUB adapter board - display.
The HUB adapter board serves as the final link for data transmission, and all signals can be found on the HUB adapter board. The HUB adapter board is a card that divides the signal announced by the control panel into several tributaries, also called a distribution board. Under normal circumstances, it is determined according to the vertical number of LED display modules.
The display contains various signals. The signal starts from the HUB board, and is connected to the unit board or the module through the cable, and the data transmission is completed. All signals are transmitted in parallel except that the data signal is serial. The various signal effects are now analyzed as follows.
CLK clock signal
The shift pulse supplied to the shift register, each pulse will cause the data to shift in or out of one bit. It is necessary for the data on the data port to be in harmony with the clock signal to transmit data normally. The frequency of the data signal must be 1/2 times the frequency of the clock signal. When the clock signal is abnormal, the whole board will be displayed in a mess.
STB latch signal
When one data transfer ends, the STB latch signal is useful, latching the data in the shift register, and displaying the data content through the drive circuit lighting LED.
It is necessary to illuminate the condition to enable the open condition. In any case, when the latch signal is abnormal, the whole board will be displayed in a mess.
EN enable signal
The full screen brightness control signal is also used for display blanking. You can manipulate the change in brightness by simply adjusting its duty cycle. When the enable signal is abnormal, the whole screen will show no bright, dark or trailing.
Color data signal
Supply the data required to display the image. It is necessary to communicate with the clock signal to transfer the data to any display point. Generally, the red, green and blue data signals in the display do not leave. If a data signal is short-circuited to the positive or negative pole, the corresponding color will be fully lit or not lit.
ABCD line signal
It exists only when the dynamic scan is displayed. A is the lowest bit. If the binary indicates that the maximum size of the ABCD signal manipulation is 16 lines (0000-1111), only the AB signal is needed in the 1/4 scan, due to the indication of the AB signal. The scale is 4 lines (00-11). When the line control signal is abnormal, it will show the phenomenon of misalignment, highlighting or image stacking.
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