Wireless screen projection technology synchronizes the images and sounds of smart devices to other display devices (such as TVs, projectors, computers, etc.) through wireless transmission protocols, and is widely used in home entertainment, business meetings, education and other fields.
In this era of "multi-screen interaction", wireless screen projection technology is quietly changing our work and life. From smooth presentations in conference rooms to home theaters in living rooms, with just a click, the picture can leap over spatial limitations and break the limitations of wired deployment.

1. Mobile phone wireless screen projection

Mobile screen projection is divided into two modes, corresponding to different usage scenarios:
Push mode: send the playback address of video/audio to the display device through DLNA, AirPlay and other protocols. The mobile phone is only used as a controller. After the screen is projected, other applications can be closed or operated. "TV screen projection" function commonly found in video software
Mirror mode: synchronize the content of the mobile phone screen in real time, suitable for scenes such as games and PPT presentations. The technical principle is that the mobile phone continuously captures the screen and transmits it to the display device via Wi-Fi, which requires the use of protocols such as AirPlay (Apple) and Miracast (Android). Apple users connect to the TV through the "Screen Mirroring" function; Android users search for devices through the "Wireless Screen Casting" option.

2. One-transmit-one-receive screen projection

Point-to-point transmission is achieved by pairing the projector transmitter and the receiver. It is characterized by plug-and-play and high stability: suitable for old monitors that do not have the screen projection function. Its advantage is that it does not need to rely on an external network, and is transmitted through an independent 5G frequency band, supporting high-definition picture quality (such as 4K) and low latency (such as the delay of the millimeter wave screen projector is only 30ms). Suitable for use in: corporate conference rooms, home entertainment, many screen projectors currently support Windows, Mac, mobile phones and other multi-device compatibility.
On the basis of the one-transmit-one-receive wireless screen projector, there is also a one-transmit-multiple-receive and multiple-transmit-one-receive technology.
For example, the one-transmit-multiple-receive wireless screen projection technology enables a single transmitter to transmit images to multiple receivers at the same time. With the help of the multicast function, multiple receivers (such as screen projection boxes) are connected to the same network through a local area network, and the content of the transmitter can be synchronized to multiple screens. It is suitable for large venues to achieve multi-screen display through wireless technology.
Under the multi-transmit-one-receive technology, the button on the transmitter can be switched to connect to the same receiver to improve collaboration efficiency.

3. Software Screen Casting

Software screen casting is a technology that wirelessly transmits the screen content of smart devices (mobile phones, computers, tablets, etc.) to display devices (TVs, projectors, etc.) through software protocols or applications. Compared with hardware screen casting solutions, software screen casting relies on network environment and software functions, and has the characteristics of high flexibility and low cost, but it may also be limited by network stability.
Like the AirPlay (Apple ecosystem), Miracast (Android/Windows), and DLNA (cross-platform streaming media push) screen casting technologies that we often use, they all belong to software screen casting. We only need to put the display device and the mobile phone in the same WIFI network to achieve screen casting through the screen casting function of the mobile phone. This screen casting protocol natively supported by the operating system does not require the installation of additional software and has strong compatibility. There is also a kind of software screen casting, which is based on third-party screen casting software, which requires the installation of supporting applications on the sending and receiving ends respectively. The function is more flexible and supports cross-platform: common LeBo screen casting, TeamViewer/Sunflower (remote control type) are third-party software screen casting. Of course, there are also our conference software such as Tencent Conference, which also belongs to software screen casting.
Of course, different wireless screen projection methods are suitable for different application scenarios.