Modern technology makes it possible to completely eliminate wires when viewing multimedia content, and transferring images from a computer to a large screen has become a routine task. Wireless connection Provides sufficient bandwidth for streaming high-definition video, including 4K, if your home network is configured correctly. Users often need to share a presentation with colleagues or simply watch a movie online on a 55-inch or larger screen.
There are several main protocols and methods that allow you to implement this function, and the choice of a specific method depends on the operating system of your computer, version Windows or macOS, as well as the capabilities of the TV itself. Some methods are built into the system by default, others require additional software, but all rely on a stable signal. Wi-Fi routerIn this article, we'll explore the most effective and proven connection options so you can choose the best one for your situation.
Before you begin setting up, make sure both devices—your computer and your TV—are connected to the same wireless network. This is fundamental condition For most streaming technologies, such as Miracast or DLNA, to work, devices must be able to see each other on the local network. If you're using a guest Wi-Fi network or different frequencies (2.4 GHz and 5 GHz) with isolated clients, the connection may fail.
⚠️ Note: If your router supports AP Isolation, devices on the network will be unable to communicate with each other, even if they are on the same network. To stream video, you must disable this feature in your router settings.
Wireless Video Transmission Technologies: What's the Difference?
Understanding the operating principles of various data transmission standards will help avoid confusion during setup. The main players in this field are Miracast, DLNA and proprietary solutions like AirPlay or Google CastEach has its own characteristics, advantages, and limitations in terms of image quality and latency.
Miracast is a technology developed by the Wi-Fi Alliance that allows you to directly transmit video and audio from your device to a display without any loss of quality. It works by mirroring the image on your TV, meaning the image on your computer screen mirrors what's on your TV. This is convenient for sharing your desktop, but can be less effective for background video downloads, as your computer continues to consume resources rendering the image.
DLNA (Digital Living Network Alliance) works differently: it doesn't broadcast the screen, but transmits the media file itself over the network. In this case, the TV acts as a renderer, decoding the video stream itself. This frees up computer resources, allowing you to turn off the screen or do other things, but the file format must be supported by the TV. If the TV doesn't recognize the audio or video format, playback will not begin.
- 📺 Miracast — ideal for screen sharing, gaming, and real-time UI interaction.
- 🎬 DLNA — the best choice for watching downloaded movies and TV series in the background.
- 🍏 AirPlay 2 — an Apple standard that ensures minimal delays for device owners Mac And iPhone.
- 🌐 Chromecast built-in — Google technology that allows you to stream content directly from your browser or applications.
The choice of protocol is often dictated by the ecosystem you are in. For Windows 10 and 11 users, Miracast is the most native, while owners MacBook will look for AirPlay support. It's also important to consider that older TV models may not support new standards, requiring external adapters.
⚠️ Note: Smart TV interfaces and feature names may differ between manufacturers. For example, Samsung calls Miracast "Smart View," while LG calls it "Screen Share." Look for sections related to connection or screen sharing in your TV menu.
Preparing equipment and a Wi-Fi network
Wireless streaming quality directly depends on signal stability and connection speed. For comfortable viewing of videos in Full HD or 4K resolution, we recommend using the following range: 5 GHz, which provides higher throughput and is less susceptible to interference from neighboring networks and household appliances.
Make sure both devices are within a strong signal range. Walls, especially load-bearing ones, and metal structures can significantly weaken the signal, resulting in artifacts, stuttering, or a complete loss of connection. If the router is located far away, consider using a Wi-Fi repeater or mesh system to improve coverage.
It's also worth making sure your computer and TV have the latest software updates. Manufacturers often release patches that fix network module bugs and improve compatibility with various data transfer protocols. Go to Settings → System → Software Update on your TV.
☑️ Check before connection
If you're using a corporate network or a complex home setup with multiple subnets, ensure that traffic is allowed between devices. Sometimes antivirus software or firewalls on your PC can block incoming connections needed for TV detection.
Broadcasting via built-in Windows tools (Miracast)
Windows 10 and 11 operating systems have built-in support for Miracast technology, making the connection process extremely simple and requiring no additional software. This method, often referred to as "Projection" or "Wireless Display Connection," allows you to project your entire screen or extend your desktop onto a TV.
To get started, you need to activate the signal reception function on your TV. Depending on the model, this may be called Screen Share, Miracast, Wireless Display or simply "Connect." Once this feature is enabled, the TV will enter connection standby mode.
On your computer, press the key combination Win + KThe "Connection" panel will open on the right, where the system will begin searching for available wireless displays. When your TV's name appears in the list, click it. After a few seconds, the image from your desktop will appear on the big screen.
- 🖥️ Click
Win + Pto select a projection mode: Duplicate, Extend, or Second Screen Only. - 🔊 Sound will also be transmitted to the TV if you select the "Digital Audio" output device or the name of your TV model in the Windows sound settings.
- ⚙️ To adjust the quality, go to
Settings → System → Project to this PCto allow or deny connections.
If your connection is slow or lags, try lowering your computer's screen resolution or refresh rate. This is especially true for older routers or those with a lot of interference. In some cases, rebooting your network adapter can help.
⚠️ Note: Some older graphics cards or drivers may not support Miracast. If the "Connect" button is grayed out or no devices are found, check your PC's Device Manager for Wi-Fi Direct support.
Using DLNA to play files
If you simply want to watch a movie stored on your computer's hard drive, using DLNA is a more efficient solution than screen mirroring. In this case, the TV decodes the video itself, and the computer acts as a media server. This reduces the load on the PC and allows you to control playback using the TV remote.
Windows 10 and 11 have built-in media server functionality, but it requires properly configured shared folders. You need to open "Media Streaming Settings" in Control Panel and allow file access for your TV. The system usually automatically detects devices on the network and prompts you to enable streaming.
Once set up, open the app on your TV that handles viewing photos and videos from external sources. It may be called "Media," "Gallery," "Media Manager," or have a brand name, such as LG Content Store or Samsung AllShareSelect your computer from the list of sources.
Navigating the file system is done through the TV interface. You can browse the folders where video files are stored and start playing them. The advantage of this method is that you can pause the video, go to the kitchen, and then return and continue watching from the same spot, if your TV supports this feature.
| Parameter | Miracast (Projection) | DLNA (Media Server) |
|---|---|---|
| PC load | High (screen rendering) | Low (data transfer only) |
| Control | From a computer | From the TV remote control |
| Formats | Any (as on the screen) | Only supported TVs |
| Background | The PC screen is active | The PC screen can be turned off |
It's worth noting that DLNA doesn't transmit the operating system interface, browser, or games. It's purely a tool for consuming content: videos, music, and photos. For full functionality, ensure that private network profiling is enabled in Windows Firewall.
Third-party programs and browser solutions
Built-in tools don't always work perfectly, and that's where third-party apps come in. One of the most popular solutions is LetsView or AirServer, which expand wireless transmission capabilities. They often offer capabilities that standard solutions cannot, such as streaming audio from a Mac to non-AirPlay TVs.
Browser Google Chrome It also has a powerful built-in casting feature. Open the menu (the three dots in the upper right corner) and select "Cast." You can cast a single tab, the entire desktop, or a file from your computer. This is convenient if you need to show a website or video from a webpage that doesn't have built-in Smart TV support.
Codec issues with DLNA
If your TV doesn't play a file via DLNA, it likely doesn't support the audio codec (such as DTS) or video container. In this case, installing a third-party media server, such as Plex or Kodi, which can stream video in real time by transcoding the stream on the fly, can help.
For Apple ecosystem users who want to connect a Mac to a TV without AirPlay 2 support, there are emulator apps that can be installed on Smart TVs (if the app store allows it) or set-top boxes. However, it's often easier and more reliable to use an HDMI cable if the wireless connection is unstable.
Using specialized software such as Plex, transforms your computer into a fully-fledged home theater with a beautiful interface, movie posters, and descriptions. This requires initial library setup, but the results are worth it for lovers of high-quality video.
Troubleshooting connection issues
Despite the simplicity of the technology, users often encounter problems with their computer not detecting their TV or with the connection constantly dropping. The most common cause is a different network profile. Make sure the network your PC is connected to is marked as "Private" and not "Public." Windows blocks other devices from being detected when using a public profile.
If the image is choppy or broken into blocks, this is a sign of insufficient bandwidth. Try turning off other bandwidth-consuming devices (smartphones, tablets) or moving the router closer to the viewing area. Switching to a less congested Wi-Fi channel in the router settings may also help.
If you have sound but no picture (or vice versa), check your Windows playback device settings. Right-click the speaker icon in the system tray, select "Open Sound Settings," and make sure your TV, not your laptop speakers, is selected as the output device.
⚠️ Note: Third-party antivirus software (Kaspersky, ESET, Avast) may have its own firewall that blocks the local network. If you experience connection issues, try temporarily disabling network protection in your antivirus.
Sometimes resetting network settings helps. In Windows 10/11, this can be done via Settings → Network & Internet → Advanced network settings → Network resetPlease note that you will need to re-enter your Wi-Fi password after this.
Why isn't my TV showing up in the list of available devices?
Most likely, the devices are on different subnets (for example, one is connected to guest Wi-Fi, the other to the main Wi-Fi) or client isolation is enabled on the router. Also, check if your antivirus software is blocking detection.
Is it possible to stream video from a computer to a regular TV without a Smart TV?
Yes, you'll need an external set-top box, such as a Google Chromecast, Apple TV, Amazon Fire Stick, or Android Box. These devices connect to the HDMI port of a standard TV and add Smart TV functionality, allowing you to receive a signal from your computer.
How to reduce lag when screen sharing?
Use the 5 GHz band, move closer to your router, close background programs on your PC that consume bandwidth, and select "Second screen only" in Windows projection settings to avoid rendering the image twice.
Does my computer support Miracast?
Click Win + R, enter dxdiag, save the report, and open the file. Find the line "Miracast." If it says "Available," then your hardware supports the technology. You can also enter [in the command line] netsh wlan show driver and look for the line “Wi-Fi Direct supported”.