Wireless projection is the product of the development of projector technology to a certain stage. Wireless projection has not only changed the way of using traditional projectors, but in a sense, it has also changed the concept of people using projectors for work and entertainment. Advantages of wireless projector Users are greatly restricted by connection when using a wired projector. Real-time data sharing on the projector is even more complicated. For example, in situations like round table meetings and interactive discussions, lectures or classrooms, the data of different speakers are stored in different laptops, and the laptops have to be replaced frequently when taking turns to give presentations, which requires reconnection. Refuse projector. The application of wireless technology allows users to get rid of the messy cable shackles, and satisfies the desire for free projection. Projectors using wireless projection methods can generally be connected to a local area network through a standard wireless transmission protocol, and a computer in the same local area network as the wireless projector can control the work of the projector in the conference room, easily achieving one-to-one and multiple pairs One-to-many connection projection. Technology type of wireless projection From the current application point of view, wireless projection technology mainly includes wireless network projection, peer-to-peer (AdHoc) mode projection and PC memory card projection. 1. Wireless network projection Networking is the extension of wireless projectors. The application of Wi-Fi technology has revolutionized traditional projection methods. With the development of wireless technology, wireless network projectors have become more and more common in the market. Generally, they can be connected to a local area network or laptop through a standard wireless transmission protocol, and computers in the same local area network can directly operate the projector. Control the work of the projector in the conference room, etc. Network projection can be realized by wired and wireless means. The wired method means that the network cable can be directly connected to the network interface on the projector, while the wireless method means that the projector has a built-in wireless network card. In the connection between an ordinary projector and a computer, the display information of the computer is converted into a display signal in the computer, and then transmitted to the projector, so that the amount of information transmitted to the projector is very large. After the network connection is adopted, the network transmission method and network bandwidth do not allow the transmission of analog display signals, so the most popular information transmission method in the network can only be used-the computer directly transmits the display information to the projector, in the projector Complete the conversion of display information to analog display signal. For a wireless network projector, we can visually understand it as a combination of an ordinary projector and a reduced PC. It can directly connect the network and the user without the computer, changing from an isolated PC peripheral product to a network in the network. For organic nodes, any computer in the network can access the projector through specific software, control presentations or set various projection parameters, and can realize remote synchronous presentations and real-time sharing of projection equipment. 2. Peer-to-peer (AdHoc) mode projection Peer-to-peer (AdHoc) is a wireless structure through which one or more computers can share a projector with peer-to-peer wireless capabilities. This means that every projector user has the same initiative and can use the projector. AdHoc is a wireless mobile network technology that has emerged in the civilian field. AdHoc network research was originally applied in the military field. The project research was funded by the US Defense Advanced Research Projects Agency. Adopting peer-to-peer (AdHoc) projection mode, only a router and a stand-alone wireless access node can be used to connect the second or third computer to the wireless network. For users who do not have external LAN (local area network) or Internet connection conditions, this is a very simple and practical way of data and document sharing. The nodes in the AdHoc network are all composed of mobile hosts. When temporarily communicating in areas without wired infrastructure, it can be easily implemented by building an AdHoc network. WindowsXP supports this technology and can provide an automatic dedicated IP address between 169.254.0.0 and 169.254.255.255 for the network adapter. 3. PC memory card projection The projector is equipped with a memory card reader, which can be used for projection demonstration without the PC. This is a relatively simple wireless projection mode, and more and more projectors are designed with memory card readers. Users can save the data or digital pictures that need to be demonstrated, such as Word, Excel, PowerPoint, etc., in the corresponding type of memory card, and insert the memory card into the projector to directly read the data stored on the card for presentation.