The System Components Of HD Commercial LED Displays

The HD commercial LED display system should have the upper computer, screen body part, power supply part, control system, and communication system. As shown in Figure 2.9, the host computer is the PC, PC for data management, transmission, update, and control, etc., PC machine and control system between the serial port transmission: LED display control card, that is, the control system, responsible for the number of host computer data analysis and screen scanning control, etc., LED display control card for the entire system core, determine the display effect of this LED display: LED display screen The carrier of information display.

As shown in Figure 2.10 is for the microcontroller for the HD commercial LED display system block diagram, the microcontroller system is the control center of the whole LED display system, where the control function of the microcontroller is generally through the software and hardware to achieve, the microcontroller software part generally mainly has the parsing of the upper computer data, row scan control, etc.; and the operation of the software is built on top of the hardware. The hardware part is responsible for the communication circuit with the upper computer, the system power supply, and row scan driver circuit, and so on.

For an HD commercial LED display control system, a scanning cycle to determine whether the display system is an important parameter of qualification. Visual temporary imagination is the image of the object through the eyes into the human brain nerve, the image will briefly stay for a period of time, will not immediately disappear, in the brain will leave a residual image, this phenomenon is called "visual temporary", by the principle of visual temporary time know, if you want to get a stable picture display, the picture display must have 25 This phenomenon is called "visual retention".

It is known that the visual retention time of the human eye is 1/25th of a second. As long as the time of each scan is less than that value, it will leave a stable screen display in the human eye. Of course, the scanning time and the size of the screen also have a relationship, the larger the screen, the more data required, and the greater the data transfer time. Reasonable screen size is also an important factor affecting the display of the screen. This has certain requirements for the processor frequency of the control system, ARM-based 32-bit MCU processor with high frequency and large storage capacity, and the latest 32-bit ARM microcontroller also has digital signal processing functions. The ARM microcontroller is a feasible solution for the controller.

The Screen Body Of HD Commercial LED Displays

The HD commercial LED display parameters are grayscale, screen height, screen width, base color, scan frequency, and so on, whether it is a monochrome screen or a full-color screen, no matter which use of LED display, different display screen width, screen height, grayscale, base color and so on are different, for different control systems, display screen design of various parameters are not the same, so the display design parameters are limited by many conditions.

As the LED display is to have light-emitting diodes by ranks to form a unit module, and then assembled by the unit module into a larger display small screen, as shown in Figure 2.11, is a two-color LED display module, drive to change the module, must be driven by ranks. LED two-color screen is a single tube of red and green colors constituting a pixel as the smallest display unit and each color can be individually controlled by a LED display screen.

The HD commercial LED display body is a number of unit modules assembled to form a number of unit modules will be assembled to form a row of LED displays, the driver is in accordance with the order in which each line will be lit, and the display every n lines of LED scanning for a cycle, is called n line screen body. The data interface of the screen body is cascaded, the clock of the screen body, data latch control side and other control interfaces are connected in parallel, and the final screen body interface is a set of interfaces as shown in Figure 2.12. Screen body structure as shown in Figure 2.12, the screen body consists of a line selection interface, serial data interface, the control signals are scan clock, data latch control terminal, output enables control terminal. Each module shares these three drive signals, and the data interface of each module is cascaded.

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