Led display production tutorial - Solutions - Huaqiang Electronic Network
The LED screen, as a new medium, sports luminous text, is more attractive to attract attention, large amount of information, updated at any time, has very good advertising and notice effects. LED screens are simpler than neon lights, easy to install and use, more effects change, and can update content at any time. It is a good indoor and outdoor visual media. LED screens are high-tech electronic products, which are relatively expensive and have been used in government and units. Technology continues to advance, prices continue to decrease, and assembly and maintenance are simpler. The small LED strip screen, because of its low price, simple installation and use, is widely accepted by the public, gradually enters large and small stores, and the application is more popular, and gradually becomes popular. The application is also very extensive: new media, new effects, new business LED strip screen as a new media, is also a new type of decorative material, can be embedded in a lot of interior decoration, making the decoration more dynamic, constantly updated subtitles, can be used as a new notice Board, promotional offers and promotional information. Greatly improved the grade of interior decoration, with a good visual effect. Due to the technical content of the installation and use of the LED strip screen, the development in the advertising industry is restricted. Mastering LED technology can improve the technical content of interior decoration and expand business. 
The LED strip screen is embedded in a variety of devices for the general public due to its simple control. The font is large, dynamic, and has a large amount of information. It is suitable for long-distance viewing and timely broadcasts the latest news to the public to attract public attention. Widely used in queuing systems, reporting systems, water dispensers, etc. LED strip screen control card, simple and stable, can be easily embedded into the system, saving developers the cumbersome work of developing LED display, focusing more on the system's functions and innovation. The LED strip screen control card development kit provides detailed development examples, providing a good environment for your system integration and 2 developments. 
To make an LED display, you must first understand the components: cell board, power supply, control card, wiring, switching power supply and LED strip screen control card.
The unit board is one of the display core components of the LED, and the quality of the unit board directly affects the display effect. The unit board is composed of an LED module, a driving chip and a PCB circuit board. The LED module is actually packaged in a matrix by a large number of LED light-emitting points with resin or plastic. The driver chip is mainly 74HC595 74HC245/244 74HC138 4953. The common unit board specifications for indoor strip screen are: Parameter: D=3.75; Point distance 4.75mm 64 points wide x 16 points high, 1/16 sweep indoor brightness. Single red / red and green two-color parameter interpretation: Light diameter: refers to the diameter of the light-emitting point D = 3.75mm light-emitting point distance 4.75mm ---- according to the distance of the viewer, the general choice of indoor 4.75 unit board size: 64x16- -- The most commonly used cell board, the easiest to buy, and the cheapest. 1/16 sweep: The control mode of the unit board. Indoor brightness: refers to the brightness of the LED light-emitting point, and the indoor brightness is suitable for the environment that needs to be illuminated by fluorescent lamps during the day. Color: single red, most commonly used, and the cheapest price. Two colors generally refer to red and green, and the price is high. If you want to make a 128x16 dot screen, you only need to connect 2 cell boards together. 
power supply
The power supply generally uses a switching power supply, 220V input, and 5V DC output. It should be pointed out that since the LED display screen is a precision electronic device, a switching power supply is required, and a transformer cannot be used. For a single red indoor 64x16 cell board, the current is 2A when fully lit. It is inferred that when the 128x16 two-color screen is fully lit, the current is 8A. The 5V10A switching power supply should be selected.
control card
We recommend the use of a low-cost strip-screen control card that can control a 1/16-scan 256x16-point two-color screen to assemble the most cost-effective LED screen. The control card belongs to the asynchronous card, that is to say, the card can be powered off to save information, and the information stored therein can be displayed without connecting to the PC.
When purchasing the unit board, please ask for the parameters. The 100% compatible unit board has: 08 interface 4.75mm point distance 64 points wide x 16 points high, 1/16 sweep indoor brightness. Single red / red and green two-color 08 interface 7.62mm point distance 64 points wide x 16 points high, 1 / 16 sweep indoor brightness. Single red / red and green two-color 08 interface 7.62mm point distance 64 points wide x 16 points high, 1 / 16 sweep half outdoor brightness. 
Connection
Divided into data lines, transmission lines, and power lines. The data cable is used to connect the control card and the LED unit board cable, and the transmission line is used to connect the control card to the computer. The power cord is used to connect the power and control cards, power and LED unit boards. The diameter of the copper core of the power cord connecting the unit board is not less than 1mm (mm)
Accessories production
The cable (data line) is similar to the data cable inside the computer case, except that the width of the line is a little different. You can buy related materials in Computer City. To make a cable, you need a tool, which is a special pliers (picture), which can greatly improve work efficiency and yield. The materials for making the cable are: cable, cable head, and cable cap. It should be noted here that if you make a 16PIN (16-line) cable, you need to purchase a 16PIN cable and a correspondingly sized cable head and cap. In the making step, cut the thread with a pair of scissors, then put the head of the thread, (note the balance of the line and the head), then put it into the center of the crimping pliers, press firmly, then wrap the thread around and install the cable cap. The cable cap is very important, which can effectively protect the cable and make the cable more robust.
The power supply is divided into a 220V power line and a 5V power line. The 220V power cord is used to connect the switching power supply to the mains. It is best to use a 3-pin plug, which can be purchased at the hardware store. Here we focus on the power line of 5V DC. Since the current of 5V is relatively large, it is better to use red and black pairs with a copper core diameter of 1mm or more (must be red and black). If possible, it is best to attach the metal parts to both ends of the line. 
The power supply is divided into a 220V power line and a 5V power line. The 220V power cord is used to connect the switching power supply to the mains. It is best to use a 3-pin plug, which can be purchased at the hardware store. Here we focus on the power line of 5V DC. Since the current of 5V is relatively large, it is better to use red and black pairs with a copper core diameter of 1mm or more (must be red and black). If possible, it is best to attach the metal parts to both ends of the line. 
The RS232 cable is used to create an RS232 cable for connecting a computer and a control card to update screen data. Here you need to use the DB9 header and network cable (available in Computer City). Look closely at the DB9 head, with numbers on it, connect 5 to brown, and 3 to brown. Clamp the cable and install it in the DB9 head. (It's very important here, be sure to clamp it, pull it a few times and see if it pulls off). Then use a multimeter to measure the two ends and turn them on. It needs to be pointed out here that the head of DB9 is divided into male and female. Behind the computer belongs to the mother seat, so you need to buy a male plug. If you don't understand, please take a closer look at your PC. Today's notebooks generally do not have a serial port. Please purchase a USB to RS232 serial port.
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