Analysis of Data Transmission Mode of Outdoor LED Display Screen

Outdoor LED display is widely used in the release of various live information. Is there a more convenient way to update the display data in real time?As a new information medium, LED display has outstanding advantages in performance. It has long service life, fast response, simple drive and stable performance, so it has been widely used in various fields of society. For example, expressway uses LED display screen to release road condition information in real time; Stadiums and gymnasiums use LED display screen to announce the live situation in real time and so on. How can these real-time information be quickly released to the scene?Figure 1 outdoor LED display

Analysis of Data Transmission Mode of Outdoor LED Display Screen 1

At present, the data transmission of outdoor LED display can be carried out in the following ways:Staff use portable computers to update data at the equipment site. The disadvantage is that it is difficult to update the display data in real time, find the faults of LED display screen in time, increase the labor intensity of staff and increase the labor cost of enterprise operation.The LED display screen is connected to the Internet through the Ethernet line to communicate with the server-side computer connected to the Internet, and the computer is used to transmit data to the LED display screen through the Internet. This method requires Ethernet cabling, which has the disadvantages of inconvenient installation and expensive maintenance cost.

The control of LED display screen is realized through short message. The disadvantage of this data transmission method is that it is difficult to edit short messages and the amount of data transmitted is relatively small. At the same time, the transmission of short message also has a certain time delay, which is difficult to ensure the real-time performance of data, especially in the occasions where real-time information display is required, such as road traffic, stadiums and gymnasiums.The LED display screen is controlled through the mobile communication network. The advantages of this data transmission method are simple installation, fast speed, not limited by time and space, and can update the display data in real time. Therefore, the use of mobile communication network has become an ideal choice.The system for remote control of LED display screen based on GPRS network is shown in the figure. The system consists of LED display screen, GPRS DTU, host computer server software and so on. In this scheme, the only requirement for the LED display controller is that it needs to have RS-232 or RS-485 communication interface.

Figure 2 GPRS Remote Control LED display schemeZwg-20ie is a wireless data transmission device (DTU) based on GPRS network, which provides users with high-speed and fully transparent data channel. It is simple to use and stable and reliable. At the same time, zwg-20ie has the design of large buffer area and adopts dynamic partition technology to meet the transmission requirements of different data volumes.Figure 3 zwg-20ie GPRS DTU

GPRS wireless data transmission equipment transmits data through the Internet. The upper computer server of LED display screen needs to be connected to the Internet to communicate with GPRS wireless data transmission equipment. The host computer server can connect to the Internet by using static IP or dynamic domain name. If the host computer server of LED display screen is in the LAN, it also needs to do port mapping on the router.In this application, zwg-20ie is the client of network equipment, and the host computer software controlling LED display screen is the server. The host computer software can communicate with the client through standard socket network programming.Figure 4 LED display screen adopts zwg-20ie

Analysis of Data Transmission Mode of Outdoor LED Display Screen 2

Generally speaking, manufacturers producing LED display controller will provide an upper computer software based on RS-232 interface, which communicates with LED display controller through serial port. In view of this, we provide a virtual serial port software to directly virtualize zwg-20ie into a "wireless serial port", Users can use it directly without modifying the existing upper computer software based on RS-232 interface.

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Anti Aging Knowledge of LED Electronic Display Screen
LED display advertising media also has the advertising characteristics of high effective arrival rate. Compared with TV, newspaper and other media delivery forms, the price of LED display is relatively low. These unique values make the full-color LED advertising screen media naturally become the upstart of outdoor media.Different from the traditional outdoor media, the full-color LED display is not just a simple outdoor media. It also has the characteristics and advantages of TV and other media. It has a larger creative space and a broader three-dimensional space for space-time interaction and communication with consumers. It can meet the personalized needs and has the communication concept of the digital age. It is a unique screen form.We often have such problems when applying LED display. LED display works normally at the beginning of the product, but after it is lit for a period of time, there will be dark light, flashing, failure, intermittent lighting and other phenomena, which will bring serious damage to the product. The reasons for this phenomenon are as follows:First, when applying products, there are problems in the welding process, such as too high welding temperature, too long welding time, failure to do anti-static work, etc. more than 95% of these problems are caused by the packaging process.Second, led quality or production process. Prevention methods include:1. Control the welding process.2. Aging test of products: aging is an important guarantee for the reliability of electronic products and the last essential step in product production. LED products can improve efficiency after aging and contribute to the stability of efficiency in later use. The aging test of LED display screen is a very important link in product quality control, but it is often ignored in many times, so it is impossible to carry out correct and effective aging.Led aging test is a countermeasure taken according to the characteristics of product failure rate curve, that is, bathtub curve, so as to improve the reliability of products, but this method is not necessary. After all, aging test is at the cost of sacrificing the service life of a single LED product.Led aging methods include constant current aging and constant voltage aging. Constant current source means that the current is constant at any time. If there is a problem of frequency, it is not constant current. That's AC or pulsating current. AC or pulsating current source can be designed with constant RMS, but this power supply can not be called constant current source.Constant current aging is the most scientific led aging method, which is most in line with the working characteristics of LED current; Overcurrent impact aging is also the latest aging method adopted by LED display manufacturers. Such aging is carried out by using a constant current source with adjustable frequency and current, so as to judge the quality and expected life of LED in a short time, and pick out many hidden dangers that cannot be picked out by conventional aging.
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