What are the main components of the led display screen? There are many LED display manufacturers on the market, and the price of the same type of LED display is still very different. A large part of the reason lies in its components. The quality and unit price of these structural components will affect the final price of the LED display. Follow us today Let’s take a look at the components of the led display:
1. Unit board
The unit board is one of the core components of the led display. The quality of the unit board will directly affect the display effect of the led display. The unit board is composed of the led module, the driver chip and the pcb circuit board. The led module is actually composed of many The LED light-emitting point is encapsulated with resin or plastic;
The driver chip is mainly 74HC59574HC245/24474HC1384953.
The commonly used unit board specifications for indoor led screens are:
Parameter D=3.75; dot pitch 4.75mm, dot width*16 dot height, 1/16 sweep indoor brightness, single red/red and green two colors;
Parameter explanation
D represents the luminous diameter, which refers to the diameter of the luminous point D=3.75mm;
The light-emitting point distance is 4.75mm, according to the viewing distance of the user, the indoor scene generally chooses 4.75;
The size of the unit board is 64*16, which is a more commonly used unit board, which is easier to buy and the price is relatively cheap;
1/16 sweep, the control method of the unit board;
Indoor brightness refers to the brightness of the LED light-emitting lamp, and the indoor brightness is suitable for the environment that needs to be illuminated by fluorescent lamps during the day;
Color, single color is more commonly used, and the price is relatively cheap, two-color generally refers to red and green, and the price will be slightly higher;
Suppose you want to make a 128*16 screen, just connect two unit boards in series;
2. Power
Generally, switching power supply is used, 220v input, 5v DC output, but it should be noted here that because the led display is a sophisticated electronic device, it is necessary to use a switching power supply instead of a transformer. For a single red indoor 64*16 When the unit board is fully bright, the current is 2a; it can be inferred that the current of the 128*16 two-color screen is 8a in the fully bright state, and a 5v10a switching power supply should be selected;
3. Control card
We recommend using a low-cost strip screen control card, which can control a 256*16-dot two-color screen with 1/16 scan, and can assemble an LED screen with a higher cost advantage. The control card is an asynchronous card, that is to say, The card can save information after power off, and can display the information stored in it without connecting to a computer. When purchasing a unit board, you need to consult the parameters. The fully compatible unit board mainly has 08 interface, 4.75mm point distance, 64 points wide and 16 points high. , 1/16 scan indoor brightness, single red/red and green two colors; 08 interface 7.62mm point distance 64 points wide * 16 points high, 1/16 scan indoor brightness, single red/red and green two colors; 08 interface 7.62 points distance 64 points Width*16 points height, 1/16 half-sweep outdoor brightness, single red/red and green two-color;
4. About the 16PIN08 interface
Because there are many manufacturers of unit boards and control cards, there are many interface styles of the unit board. When assembling the LED screen, it is necessary to confirm the consistency of the interface to facilitate the assembly. Here we introduce the commonly used LED interfaces: led Industry number: 16PIN08 interface, the interface sequence is as follows: 2ABCDG1G2STBCLK16
1NNNENR1R2NN15
ABCD is the row selection signal, STB is the latch signal, CLK is the clock signal, R1, R2, G1, G2 are the display data, EN is the display function, and N is the ground. Make sure that the interface between the unit board and the control card is the same and can be directly connected If it is inconsistent, you need to make a conversion line by yourself to convert the order of the lines;
5. Connecting line
Mainly divided into data line, transmission line, power line, the data line is mainly used to connect the control card and the LED unit board, the transmission line is used to connect the control card and the computer, the power line is used to connect the power supply and the control card power supply and the led unit board, the copper core of the power line connecting the unit board should not be less than 1mm in diameter;
The above are the components of the structure of the full-color LED display. In summary, there are mainly unit boards, power supplies, control cards, connecting lines, etc. I hope this article can be helpful to you. If you want to know more about the structure of the LED display knowledge, you are welcome to continue to pay attention.
Post time: Aug-22-2022