It's hard to imagine modern digital entertainment without the ability to display multimedia content on a large screen. Mirroring images from a computer to a TV via Wi-Fi has become a standard, eliminating unnecessary cables and the hassle of connecting. This process allows you to stream movies, presentations, photos, and even games with minimal latency, using only your home wireless network.
There are several technologies available for wireless video transmission, and the choice of a specific method depends on your PC's operating system, Smart TV version, and image quality requirements. In this article, we'll cover key protocols, such as Miracast and DLNA, in detail, and also explore third-party solutions for situations where built-in features don't work correctly.
Wireless video transmission technologies
Before you begin setting up, you need to understand which broadcast standard your equipment supports. Miracast — is a technology developed by the Wi-Fi Alliance that allows you to mirror your device's screen without a router, creating a direct connection between your PC and TV. It's ideal for mirroring your desktop in real time.
Unlike Miracast, the standard DLNA (Digital Living Network Alliance) is focused on streaming media content (files) over a local network, not screen mirroring. This means you can play a movie on your TV and control playback from your computer, but you won't be able to display the Windows interface this way. Wi-Fi Direct or proprietary solutions from manufacturers are most often used for screen mirroring.
It's important to keep in mind that transmission quality directly depends on your network's bandwidth and signal frequency. If your router operates at 2.4 GHz, latency and compression artifacts are possible, especially when playing 4K video.
What is the difference between casting and screen dubbing?
Casting involves running a stream on a TV device (e.g., YouTube on a Smart TV), with the PC acting as the remote control. Mirroring transmits the full desktop video stream, including the cursor, notifications, and background processes, which requires significant computing resources.
Preparing equipment and network
A successful connection directly depends on the correct configuration of the local network. The first and most important requirement is that the computer and TV must be connected to the same routerIf you have a dual-band router, make sure both devices are on the same subnet, although modern routers often automatically combine clients.
Check that your wireless adapter drivers on your computer are up-to-date. Outdated software may not support the required encryption protocols or Wi-Fi Direct standards. It's also recommended to update your TV's firmware via the settings menu, as manufacturers frequently release patches that improve the stability of wireless connections.
☑️ Check before connection
It's worth noting that some corporate networks or guest Wi-Fi networks may block direct connections between devices (AP Isolation). In such cases, screen mirroring will be impossible until you change the router's security settings.
Mirroring your screen in Windows 10 and 11 using Miracast
Windows operating systems have built-in functionality for wirelessly connecting to displays. To get started, open the notification center by clicking the corresponding tray icon or use hotkeys. Win + KThe system will start searching for available wireless displays.
You need to activate signal reception mode on your TV. This feature may have different names depending on the brand: Screen Share on LG, Smart View on Samsung or simply "Cast" on Android TV. Once the TV appears in the list on your PC, select it to initiate the connection.
Once connected, you can choose the operating mode: screen mirroring, expanded workspace, or using the TV as a second monitor. Resolution and frame rate settings are available in the menu. Settings → System → Display → Advanced display settings.
⚠️ Note: When using Miracast on networks with congested airwaves (such as many neighboring networks), micro-freezing may occur. For stable operation, it is recommended to use a router that supports 5 GHz.
Using DLNA and media servers
If your goal isn't to share your desktop, but to play a video file or presentation stored on your hard drive, DLNA technology will be more efficient. It places less load on the processor and provides a more stable data stream without the compression artifacts typical of mirroring.
In Windows 10 and 11, the media server feature is built into the system. To activate it, go to Control Panel → Network and Sharing Center → Streaming Media SettingsHere you need to allow access to content for your TV by finding it in the list of available devices.
Once configured, you can open any video file on your computer, right-click and select Play on deviceThe TV will automatically launch the built-in player and begin playback.
| Parameter | Miracast | DLNA |
|---|---|---|
| Transmission type | Screen Mirroring (Real-time) | Streaming video/audio |
| PC addiction | High (screen must be active) | Low (windows can be rolled up) |
| Quality | Depends on Wi-Fi signal | Lossless original |
| Interface | Full duplication | TV player interface |
For advanced features such as support for more file formats or subtitles, you can use third-party servers such as Plex or JellyfinThey require a client app to be installed on the TV, but provide a user-friendly interface with posters and descriptions.
Third-party screen mirroring programs
Built-in Windows tools don't work with all TV models, especially older Smart TVs or specific brands. In such cases, third-party utilities that emulate signal reception or use proprietary data transfer protocols come to the rescue.
One of the popular programs is LetsView or ApowerMirrorThe principle behind their operation is simple: the app is installed on both the computer and the TV (via the TV app store or an APK file on Android TV). The devices find each other using their local IP address.
The advantage of such solutions is the availability of additional features, such as remote control of the PC, the ability to draw on the screen, or record the broadcast image. However, it's important to note that free versions often have limitations on session time or image quality.
⚠️ Warning: When installing free versions of streaming software, be careful about additional software. Installers often try to inject advertising modules or change the browser's start page.
Broadcasting via Google Chrome browser
If your TV has Android TV or a built-in Chromecast module, the easiest way to stream is using the Google Chrome browser. This method doesn't require installing any additional software on your PC; all you need is the browser itself.
Open Chrome, click the three dots in the upper right corner and select Broadcast... (Cast). In the menu that opens, you'll see a list of available devices. The system will prompt you to choose what to cast: a browser tab, the entire screen, or an audio file.
Selecting the "Cast Screen" option will display your entire Windows desktop on your TV. This method is especially useful for sharing web content, as the browser tab can be optimized for better viewing quality.
It's worth noting that broadcasting a tab can consume significant CPU resources, especially if the page contains a lot of animation or video. This is ideal for static presentations.
Solution and stability improvement
Despite technological advances, wireless data transmission remains sensitive to external factors. If you experience audio and video desync, try reducing the network load by disabling downloads on other devices. Switching your router to a less congested channel also helps.
A common issue is no sound on the TV even though the video connection is successful. In this case, you need to manually switch the audio output device in Windows. Click the speaker icon in the system tray, select the arrow next to the volume slider, and select your TV from the list.
If the connection drops after a certain amount of time, check your Wi-Fi adapter's power-saving settings. Find your wireless adapter in Device Manager, go to Properties, and under the Power Management tab, uncheck "Allow the computer to turn off this device to save power."
⚠️ Note: Menu interfaces and function names may vary depending on your TV's firmware version and model year. If you cannot find the option described, please refer to the manufacturer's official documentation.
Why is there a delay (lag) when using the mouse?
Latency is caused by the time required to encode the video stream on the PC, transmit data packets over Wi-Fi, decode it on the TV, and output it to the display. This is a physical limitation of the technology, which is difficult to completely eliminate without a wireless connection.
Why doesn't the TV see the computer in the list of available devices?
Most often, the problem is that the devices are connected to different networks (for example, one to a guest network and one to the main network) or that access point isolation is enabled on the router. It's also worth checking whether Windows Firewall is blocking device detection on a public network by switching the network profile to "Private."
Is it possible to stream an image if the router is turned off?
Yes, using Wi-Fi Direct (the technology behind Miracast), devices connect directly, bypassing the router. However, for DLNA or app streaming (YouTube, Netflix), an active internet connection and a router are required.
Does screen mirroring affect PC gaming performance?
Absolutely. The process of encoding a video stream for transmission to a TV puts a strain on the processor and graphics card. This can lead to a drop in frame rates in demanding games. For gaming, it's best to use a wired HDMI connection or technologies like NVIDIA GameStream, if supported by your TV.
How to reduce sound delay when watching movies?
It's difficult to completely eliminate latency over Wi-Fi. Try enabling "Game" or "PC" mode in your TV settings, which disables unnecessary image post-processing. Also, some players (such as VLC) allow you to artificially delay the audio track to sync it with the video.