LED display is a perfect combination of technology and media. It can fully display the ideas of dream, technology, trend and fashion. It can become a new force of dance beauty. New indoor large-scale LED display and outdoor advertising forms are constantly emerging
LED display is a perfect combination of technology and media. It can fully show the concept of dream, technology, trend and fashion. It can be a new force of dance beauty. New indoor large-scale LED display and outdoor advertising forms are constantly emerging, from traditional LED billboards to monochrome walking screen, and then to today’s full-color LED display. With the development of LED industry, outdoor media advertising has become more and more fashionable.
At present, outdoor LED display has occupied 80% of the outdoor media advertising field, and has become a new carrier of large-scale outdoor media advertising. Then wireless control LED large screen technology began to be popular, here we take stock of several common wireless control LED display mode.
WiFi wireless control
Working principle: through the installation of wireless router or other wireless equipment, bridge with the user’s original wireless network, build a wireless LAN, and easily integrate the network control card into the wireless network for wireless network control.
Features: no wiring, convenient installation and debugging, fast data transmission.
Required equipment and price: bridge, within 800 yuan; Wireless router (the best choice for application on the display screen is the equipment with changeable antenna, which can effectively receive the wireless signal). The price is about 100 yuan.
Disadvantages: the communication distance mainly depends on the gain ability of the bridge, the communication distance of wireless routing is relatively short, and the signal of partition wall is weak or no signal. It is suitable for places with short distance wireless signal. If there is wireless signal coverage in the area where your display screen is located, it is simpler. Just bridge the wireless router connected with the control card in the display screen to your wireless network, and you can control the LED display screen on any computer in the intranet.
RF wireless control
Working principle: one end of the RF module is connected to the control computer, the other end is connected to the serial port of the control card. After the computer installs the driver, it generates a virtual serial port and sends data through the serial port.
Features: easy installation and debugging, data transmission distance up to 300-1000 meters, no charge for later use.
Required equipment and price: RF sending and receiving module, about 350 yuan per pair. Support one to many sending, that is, one sending module to multiple receiving modules.
Disadvantages: the frequency band of radio frequency is not allowed for civil use by the state. The batch of 433MHz is extremely vulnerable to signal interference, and the transmission rate of this mode is not very low. The baud rate can only be used for 4800 or 9600, so it is not recommended.
GPRS wireless control
Working principle: after the GPRS module is powered on, it completes the process of dial-up Internet access and connects to the data center server. The client accesses the server through the client software, and the server forwards the information.
Features: convenient installation and debugging, no distance limit, as long as there is a mobile phone signal, you can receive information, and the price is relatively cheap, generally in the range of 200 ~ 400 yuan.
Disadvantages: the GPRS module needs to install a mobile phone card to dial up the Internet, and there will be a certain traffic charge every month (for example, the minimum 5 yuan traffic package of China Mobile can meet the demand). Limited by the GPRS bandwidth, the transmission rate is slightly slow, so it is more suitable for single and double color LED large screen mainly playing text.
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