Shulou(Shulou.com)11/24 Report--

In daily life, the function of casting screen can be seen everywhere.

Whether you are watching TV at home, watching a performance at the mall, or having a class at school, you can project content from mobile devices such as mobile phones and tablets to the big screen for display.

So, how is the screen function of mobile devices realized?

Next, Mr. document and your fans will learn about the screen casting technology of mobile devices.

01. The screen casting mode of mobile devices is divided into two modes: video screen casting and screen mirroring screen casting.

01. Video projection, for example, some popular dramas that you want to pursue usually need to buy members before you can watch them, but it is much more expensive to buy TV members than to buy mobile members. Budget-conscious documents only buy App members on mobile phones.

However, as long as you open the video in the App on the mobile phone, click the video drop icon in the upper right corner of the screen, and find the TV side that needs to be displayed, you can put the video that can only be viewed on the phone on the TV.

In the process of video projection, we minimize the video interface on the mobile phone, so we can do other operations on the mobile phone, and it will not affect the video played on the TV.

The video screen is usually limited to the content in the home scene.

02. Screen mirroring mirrors the contents of the mobile phone screen synchronously with the large screen through the screen casting protocol or the screen casting device. At this time, any changes in the screen on the mobile interface will be displayed synchronously on the big screen.

Wireless screen is usually used in a variety of commercial scenarios, such as corporate office, product release, intelligence education and so on.

02. Principle of screen casting the principle of screen casting of mobile devices is as follows:

01. The principle of video screen casting keeps the phone and TV connected to the same Wi-Fi, and establishes a channel through the screen casting protocol. When casting the screen, the mobile phone will send the video address to the TV, and the TV will start playing when it receives the address. After casting the screen, the mobile phone can control the progress and volume of the TV.

The mainstream screen casting protocols include DLNA protocol, AirPlay protocol and other third-party protocols.

02. The principle of screen mirroring and screen casting establishes a channel between the mobile phone and the screen TV through the Wi-Fi of the local area network. The mobile phone continuously takes screenshots (that is, screenshots) at the speed of 60 frames per second, and sends the screenshots to the TV. The TV will show it after receiving a screenshot.

Mirroring protocols include Miracast protocol, Airplay protocol and other third-party protocols.

03. Screen casting protocols there are three commonly used screen casting protocols: AirPlay, Miracast and DLNA.

01. AirPlayAirPlay is a wireless display protocol developed by Apple. It allows video to be projected from iPhone, iPad, or Mac to an Apple TV or Android TV box.

When using AirPlay, you need to start the video on iPhone, then push the video to the TV, or launch a game APP on iPad, and then mirror it to the TV.

Apple's AirPlay standard is flexible enough to support two different ways of working.

Mirror: synchronize the screen of the entire device to the TV by mirroring, including the status bar on the screen, menus, etc.

Stream mode: only transmit what you want to see on the screen, instead of copying the entire phone screen.

The limitation of AirPlay is that it is only suitable for Apple devices. But now many TV boxes support the AirPlay standard, using an iPhone or tablet, you can easily put it on a smart TV.

02. MiracastMiracast is the industry standard of Wi-Fi screen developed by Wi-Fi Alliance. Miracast projection screen is a technology that projects the content on the phone screen to other devices for display through Wi-Fi Direct technology. It supports built-in Androrid4.2+, Windows8.1 or Windows10 systems, and allows Android smartphones, Windows tablets and laptops and other devices to be wirelessly transmitted to Miracast-compatible receivers, such as smart TVs, tablets, etc. It can realize wireless connection and data transmission between mobile phone and other devices without using any wired connection. The implementation of Miracast screen projection requires the use of some specific software or applications, such as Miracast applications.

Compared with AirPlay, the advantages of Miracast are:

Built into Andorid or Windows systems, jumping out must be a limitation of Apple's terminal devices.

When there is no wireless router, Miracast can also work well, that is, the mobile phone can be directly connected to the Wi-Fi card of smart TV through Wi-Fi.

Compared with AirPlay, the disadvantages of Miracast are:

Only screen image mode is supported.

There may be problems with poor experience in screen casting between different devices.

03. DLNADLNA protocol, which is created by DLNA (Digital Living Network Alliance), is a multimedia equipment interconnection standard based on UPnP protocol. DLNA is not really a wireless display solution, it's just a way to get content on one device and play it on another.

When casting the screen through the DLAN standard, the mobile phone sends the video link (URL) to the smart TV, and the subsequent video of the smart TV no longer needs to be played through the mobile phone, but directly through the video link.

This method is also the most frequently used in our daily life. For example, when we watch a video on a mobile phone, we usually need to open a video APP on the mobile phone first. After selecting the video you want to watch, click the [TV] icon in the upper right corner of the screen, and "searching for screenable devices" will pop up, and all the screencasting devices that can be found in the same Wi-Fi network will be displayed. After the smart TV is selected, the corresponding video will be played on the TV.

04. In addition to using the above standard screen throwing protocol, there is also a special APP for screen casting APP.

When in use, open the screen casting APP on the smart TV side, and you can see the QR code or digital screen code used for screen casting. The mobile phone uses APP (or Mini Program) to scan the QR code displayed on the smart TV or enter a digital screen code to see the content on the TV.

The advantage of App is that mobile phone and smart TV do not need to be confined to the same local area network, but can span three layers of network or even wide area network.

In conclusion, some friends are still not quite clear about the difference between screen casting protocols. The gentleman of the document summed up a form for everyone to understand.

This article comes from the official account of Wechat: ZTE documents (ID:ztedoc)

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