The control system of LED is generally composed of three parts: main control box, scanning board and display control installation.
Release time:
2024-05-15
The control system of LED is generally composed of three parts: the main control box, the scanning board and the display control installation. The main control box obtains the brightness data of each color of a screen of pixels from the computer display card, and then reallocates it to several scanning boards. Each scanning board acts as a number of rows (columns) on the control LED screen, while the display and control signals of LEDs on each row (column) are transmitted in serial mode.
At present, there are two ways to transmit display control signals serially: one is to control the gray scale of each pixel point on the scanning board, and the scanning board will stop synthesizing (I .e. pulse width modulation) the brightness values of each row of pixels in the control box in the future, and then transmit the conservative signals of each row of LEDs serially to the corresponding LEDs in pulse mode (1 when lit and 0 when not lit) to control whether it can be lit. This method uses fewer devices, but the amount of data transmitted serially is large, because in a period of repeated lighting, each pixel requires 16 pulses at 16 levels of gray scale and 256 pulses at 256 levels of gray scale. Due to the frequency limitation of device tasks, the LED screen can only be made 16 levels of gray scale.
Another method is that the scanning board serial transmission is not the switching signal of each LED but an 8-bit binary brightness value. Each LED has its own pulse width modulator to control the lighting time. In this way, in a period of repeated lighting, each pixel point only requests 4 pulses under 16 gray levels and only 8 pulses under 256 gray levels, which greatly increases the serial transmission frequency. This method of gathering and controlling the gray scale of LEDs can easily realize the control of 256-level gray scale.
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