Stream your computer screen to your TV via Wi-Fi

Modern Smart TVs have become multimedia centers capable of playing content from a wide variety of sources, and the personal computer is one of the most powerful. Wirelessly transmitting images from a PC to a large screen opens up new possibilities for watching high-definition movies, showing presentations, or even gaming on a wide screen without the need to run long cables across the room. Technology has advanced greatly, and today, establishing such a connection doesn't require complex setup or expensive equipment, as long as both devices support wireless standards.

The main difficulty users face is not the lack of features, but the variety of protocols such as Miracast, DLNA and proprietary solutions from manufacturers like Samsung or LG. Each method has its own characteristics: some are suitable for real-time desktop mirroring, while others are exclusively for streaming video files. Understanding the differences between these technologies will help you choose the optimal connection method, avoiding image lag or audio issues that often arise from improper network configuration.

In this article, we will examine in detail all current synchronization methods, starting from the built-in tools of the operating system Windows 10 and 11 and ending with the use of specialized apps. You'll learn how to ensure a stable connection, which router settings can affect picture quality, and what to do if your TV doesn't see your computer in the list of available devices. Get ready to transform your TV into a giant monitor for your laptop or desktop PC.

Wireless Image Streaming Technologies: Miracast vs. DLNA

Before you begin setting things up, it's important to clearly understand the two main standards used to connect your computer to your TV. Miracast Wi-Fi Direct is a technology developed by the Wi-Fi Alliance that allows video and audio signals to be transmitted directly from device to device, creating a direct Wi-Fi connection (Wi-Fi Direct). This means your screen image will be fully mirrored on your TV, including your mouse cursor, open windows, and system notifications.

In contrast, the protocol DLNA (Digital Living Network Alliance) works differently: it's designed primarily for streaming media content (photos, videos, music) from a server (PC) to a renderer (TV). With DLNA, you won't see your computer desktop; instead, the TV will display a media player interface through which you can select files to play. DLNA often offers higher picture quality because the file is transmitted at its original bitrate, but it lacks interactivity.

⚠️ Attention: The Miracast protocol is sensitive to interference. If you plan to play fast-paced games or watch 4K videos, make sure your router operates on the 5 GHz band, as the 2.4 GHz band may not provide the necessary throughput and will cause audio and video to become out of sync.

For both methods to work successfully, it's critical that both the computer and TV are on the same local network unless Wi-Fi Direct is used. Modern video cards from NVIDIA And AMD, as well as integrated graphics Intel, as a rule, have hardware support for encoding video streams, which reduces the load on the computer processor during broadcasting.

Equipment preparation and compatibility testing

The first step before setting up is to verify the technical specifications of your equipment. Not all TVs, even those with Smart TV functionality, support over-the-air video reception, especially if the model is several years old. You need to make sure your TV's specifications state support. Wi-Fi Direct or the "Screen Share" / "Broadcast" functions.

There are also requirements on the computer side: the operating system must be no older than Windows 8.1, although Windows 10 or 11 is recommended for stable operation. Your PC's wireless adapter must support Wi-Fi standards certified by the Wi-Fi Alliance. If you're using a desktop computer with an external USB adapter, make sure it's connected to a USB 3.0 port to ensure sufficient data transfer speeds.

• 📺 Check your TV menu for the "Screen Share", "Miracast" or "Wireless" apps.
• 💻 Make sure your PC's Wi-Fi module is enabled and its drivers are updated to the latest version.
• 🌐 Both devices must be connected to the same Wi-Fi network (unless using the direct method).
• 🔌 For older TVs, consider purchasing an external adapter, such as Microsoft Wireless Display Adapter.

An important aspect is the router version. Older 802.11n models can become a bottleneck, preventing you from streaming Full HD images without compression artifacts. If your router is dual-band, switch both devices to the 5 GHz network—this will significantly improve connection stability.

Setting up screen casting in Windows 10 and 11

Windows operating systems have built-in functionality for connecting to wireless displays, making the process as simple as possible. You won't need to install any third-party software if your TV supports the Miracast standard. To get started, open the Quick Actions panel by pressing the key combination. Win + K on the keyboard.

After opening the "Connect" sidebar, the system will begin searching for available wireless displays within range. If your TV is pre-configured (in connection standby mode), it will appear in the list. Click your TV's name, and Windows will attempt to establish a connection. In some cases, a connection confirmation prompt may appear on the TV screen, which you'll need to confirm with your remote.

After successful pairing, you can control the projector's operating mode through the menu. ProjectFour modes are available: computer screen only, duplicate (copy), desktop extension (using the TV as a second monitor), and second screen only. Extend mode is especially useful for multitasking: you can work on documents on the PC monitor while playing a video or game on the TV.

⚠️ Attention: When using the "Extend" mode, the resolution of the second screen (TV) may differ from the main one. To prevent the image from being stretched or cut off, go to Settings → System → Display and adjust scaling and resolution for each screen individually.

If the connection is established but the image is choppy or poor quality, try lowering the frame rate in the graphics settings or disabling hardware acceleration in your browser if you're streaming web content. It's also worth checking if AP client isolation mode is enabled on your router, which prevents devices from seeing each other on the network.

Using DLNA to Play Your Media Library

If your goal isn't to mirror your desktop, but to comfortably view movies or photos stored on your computer's hard drive, then DLNA technology is ideal. In Windows, this feature is implemented through the "Streaming Media" service. To activate it, open the Control Panel and find the "Streaming Media Settings" section.

In the window that opens, you'll see a list of devices on your network. Find your TV and click "Allow." This will allow the Windows media server to access the user's default folders: "Videos," "Music," and "Pictures." Files in these directories will be available for selection through the TV interface.

For more advanced management of your media library, it is recommended to use specialized software, for example, Universal Media Server or PlexThese programs automatically download movie covers, descriptions, and sort content by genre, creating a user-friendly interface similar to Netflix, but with your local content.

Why can't the TV see the file via DLNA?

Often, the problem lies in the file format. If the video is encoded in a modern codec (for example, HEVC/H.265 10-bit) and the TV is old, it simply won't be able to decode it, even if it sees the file in the list. In such cases, converting or using the PC as a signal source via Miracast can help.

Third-party apps for streaming and gaming

Built-in Windows tools are good for static content, but gamers or users requiring minimal latency may require more specialized solutions. One of the best options is the app Steam LinkIf you have the Steam platform installed, you can stream games from a powerful PC to a TV in another room using a controller connected to the TV or PC.

Another popular solution is the program LetsView or AirServerThey not only allow screen mirroring but also offer additional features, such as controlling your computer from your phone or using a whiteboard. These apps often perform more reliably than the standard Miracast protocol, as they use their own video stream compression algorithms.

• 🎮 Steam Link: Ideal for gaming, supports gamepads and has low Input Lag.
• 📱 LetsView: A free cross-platform solution with good image quality.
• 💻 Chrome Remote Desktop: Allows you to control your PC via the Chrome browser on your Smart TV (if there is a TV version).

When using third-party software, it's important to consider the processor load. Encoding a video stream in real time is a resource-intensive task. If your computer starts to lag while streaming, try lowering the resolution of the streaming window or closing background applications.

Alternative solutions: HDMI adapters and Chromecast

In situations where the TV's built-in Wi-Fi module is outdated or unstable, external devices are the best solution. Adapters such as Google Chromecast or Microsoft Wireless Display Adapter They connect to the TV's HDMI port and take over all the work of receiving the signal.

These gadgets often operate more reliably than built-in smart systems, as they have their own operating system and regular updates. For example, Chromecast lets you easily cast a browser tab. Google Chrome from your computer to your TV in high quality by simply selecting "Stream" in your browser menu.

⚠️ Attention: Some HDMI adapters require power from the USB port. If your TV doesn't provide sufficient power to the USB port, use an external power supply for the adapter. Otherwise, you may experience frequent disconnections or device reboots.

Using external receivers also solves the codec compatibility issue, as they often have their own hardware decoders. This is especially relevant for older 4K TVs, which may not support new DRM standards or the codecs required for streaming from modern PCs.

Solving common problems and delays

Even with proper setup, users may encounter issues: audio and video desync, image artifacts, or complete connection failure. Most often, the cause is a congested Wi-Fi channel. If there are many neighboring networks nearby, the signal can become saturated. The solution is to switch to a less congested channel in the router settings or use the 5 GHz band.

Another common issue is Windows Firewall or antivirus software blocking incoming connections. If your computer can't see your TV, or vice versa, try temporarily disabling the firewall or adding an exception for the Network Discovery service. Also, make sure the "Private Network" profile is selected in your network settings, not "Public," as the device's visibility is hidden by default in the Public profile.

Why is the image on the TV not full screen?

This is a scaling issue. On your TV, find the Aspect Ratio mode in the picture settings and select "Just Scan," "Screen Fit," or "16:9." On your computer, check that the output signal resolution matches the native resolution of the TV display.

Is it possible to transmit sound separately if the TV has no speakers?

Yes, if you use Miracast, the audio is transmitted along with the video automatically. If you're using a cable or another method, in Windows, you need to click the speaker icon in the system tray and select your audio output device (TV) from the list of available playback devices.

Does broadcasting affect internet speed?

When using Miracast or Wi-Fi Direct, traffic flows directly between devices, bypassing the ISP's internet connection, so internet speeds don't drop. However, the load on the local Wi-Fi network increases, which can affect other devices in the home.

In conclusion, it's worth noting that wirelessly connecting a PC to a TV is a convenient and modern way to use technology. Despite the possible setup hassles, the freedom afforded by being cordless is well worth the investment. By following our recommendations, you can enjoy content on the big screen with minimal effort.