Modern multimedia systems are rarely limited to a single screen in the home, especially when creating a home theater or streaming content for a large group. Users often look for ways to connect TVs via Wi-Fi to stream content from one device to another or synchronize video streams in different rooms. This allows disparate displays to be transformed into a unified information network, controlled from a single remote control or smartphone.
There are several technological approaches to implementing this task, depending on the operating system of your Smart TV and available network equipment. The main methods are based on standards. DLNA, AirPlay 2, Miracast and proprietary solutions from Samsung or LG. Understanding how these protocols work will help you choose the best option for your specific situation without purchasing expensive additional equipment.
It's important to remember that connection stability directly depends on the quality of your wireless network. Before setting it up, make sure your router supports the frequency. 5 GHz, which will provide the necessary bandwidth for transmitting high-resolution video streams without delays and artifacts.
How Wireless Networks Work for Smart TVs
To successfully connect devices, they must all be on the same local network segment. This means that IP addresses TVs should be provided by a single router, not through separate access points with client isolation. If your router supports guest Wi-Fi, make sure isolation is not enabled on it, otherwise the devices simply won't see each other.
The main protocol that allows the exchange of media content is DLNA (Digital Living Network Alliance). It allows one device (the server) to stream video, audio, or photos to another device (the renderer). In the context of two TVs, one can act as a source and the other as a receiver, or both can receive data from a shared media server, such as a computer or NAS storage.
More modern technologies such as AirPlay 2 Apple's technology allows you to combine Apple TV devices and compatible Smart TVs into a single audio or video output system. This allows you to synchronize playback or stream content simultaneously to multiple screens with minimal latency. For Android devices, the equivalent technology is often Google Cast or Smart View.
⚠️ Please note: Some budget router models may not be able to handle multiple high-definition video streams simultaneously. If you plan to stream 4K content to two screens, please check your router's specifications.
The key parameter is channel bandwidth. A Full HD stream requires approximately 5-10 Mbps, while a 4K HDR stream can consume up to 25 Mbps or more. When connecting two TVs, the network load doubles, so using the standard 802.11ac or 802.11ax (Wi-Fi 6) is preferred.
Using DLNA technology for synchronization
The most universal way to organize data exchange between TVs of different brands remains the standard DLNATo connect devices, you don't need complicated router settings; they just need to be connected to the same network. One of the TVs (or a computer connected to the network) must have a server program installed that will share files.
The setup process typically goes like this: the media server service is activated on the content source. A new device will appear in the "Sources" or "Media" menu on the receiving TV. Selecting it allows access to the source's file system. However, standard DLNA is less suitable for screen merging (cloning) than for accessing a file library.
For more advanced synchronization, such as creating a video wall or mirroring, specialized applications running over DLNA are used. These allow you to set up multicast video streaming. In this case, one TV captures the image, encodes it, and sends a data packet, which the receiving TV decodes and displays.
It's important to configure your network settings correctly. Make sure the network type in Windows or another operating system is set to "Private" or "Home," not "Public." In a public profile, the security system blocks device discovery and file sharing by default, making DLNA unavailable.
Multi-View and Screen Mirroring on Samsung and LG
Owners of devices from leading Korean brands have access to advanced screen-merging features. Samsung often implements this technology through an app. Smart View or function Multi ViewIt allows you to not only stream images from your smartphone, but also link two TVs to display different parts of the content or full duplication.
To implement connection on Samsung devices:
- 📺 Make sure both TVs are compatible with the platform Tizen OS and are connected to the same Wi-Fi network.
- 📱 Press the button on the remote control
Homeand select the "Smart View" application. - 🔗 From the list of available devices, select the second TV to start broadcasting.
- ⚙️ In the image settings, you can select the "Screen Mirroring" or "Extend Desktop" mode.
A similar situation is observed with LG with their system Screen Share and support of the standard MiracastMiracast technology allows video signals to be transmitted directly between devices (Wi-Fi Direct), bypassing the router if the devices support a direct connection, or through network infrastructure. This ensures low latency, which is critical for gaming or presenting presentations.
⚠️ Note: The Multi View feature on some Samsung models allows you to display two signal sources on one screen. To combine two different To connect TVs to the same network, use the SmartThings app or built-in casting features.
It's worth noting that when using wireless screen mirroring, audio and video may be out of sync. This is normal for Wi-Fi connections. To minimize lag, try to position the router at an equal distance from both TVs and avoid physical obstructions.
☑️ Checking connection readiness
Bringing AirPlay 2 to the Apple ecosystem
If your TVs support AirPlay 2 (These could be modern Samsung, LG, Sony, Vizio models, or an Apple TV set-top box), you get a powerful tool for merging. This technology allows you to create groups of devices to which audiovisual content is sent simultaneously.
The main advantage of AirPlay 2 for TV sharing is its syncing capabilities. You can start a movie on your iPhone or iPad and display it simultaneously on two screens in different rooms. The system will automatically handle buffering and frame synchronization to ensure the image is identical on both devices.
Configuration is performed through the control center on the Apple device:
- Open Control Center by swiping down.
- Click on the Screen Mirroring icon (two rectangles).
- Select multiple TVs from the list (if the app supports multi-touch selection), or start with one and then add a second one via the AirPlay menu within the app.
The technology requires a stable connection 5 GHzWhen switching to frequency 2.4 GHz The stream quality may drop sharply, causing stuttering. AirPlay 2 also allows TVs to be used as wireless music speakers, creating a multi-room audio system throughout the home.
Why doesn't AirPlay 2 sometimes find my TV?
Often, the problem lies in the router settings. Make sure IPv6 is enabled (although AirPlay also works on IPv4, it may need to be enabled for proper discovery packet processing) and that multicast traffic isn't blocked by your router's firewall security settings.
Comparison of connection methods and their characteristics
The choice of method depends on your goals: whether you simply need to display photos on a large screen or set up a complex video surveillance or advertising system. Below is a comparison table of the main technologies to help you evaluate their capabilities.
| Technology | Latency | Quality | Compatibility |
|---|---|---|---|
| DLNA | High (buffering) | Maximum (without compression) | Universal |
| AirPlay 2 | Low | High (adaptive) | Apple, Samsung, LG, Sony |
| Miracast | Average | Depends on the signal | Android, Windows, LG |
| Google Cast | Low | High | Android, Chromecast built-in |
As you can see from the table, for static content (photos, video files) it is best suited DLNA, as it doesn't compress the stream on the fly as aggressively as screening methods. It's preferable for dynamic content, games, or presentations. AirPlay 2 or Miracast.
Don't forget about bandwidth. If you're using an older router, 802.11nConnecting two TVs to watch 4K video may result in constant buffering. In this case, a hardware upgrade will be necessary.
Common problems and solutions
Even with proper setup, users may encounter a number of difficulties. The most common issue is that TVs don't see each other. In 90% of cases, this can be resolved by ensuring both devices are on the same subnet. Sometimes, the router assigns addresses from different ranges for different frequencies (2.4 and 5 GHz), and the devices end up isolated.
The second problem is an intermittent connection. This may be caused by airwave congestion from neighboring networks. In this case, manually changing the Wi-Fi channel in the router settings to a less congested one (for example, 1, 6, or 11 for 2.4 GHz, or selecting a free channel in the 5 GHz band) may help.
⚠️ Note: Smart TV interfaces and menu names may vary depending on the firmware version and model year. If you don't find the feature you're looking for, please consult the manufacturer's official documentation for your specific model.
It's also worth checking your power-saving settings. Some TVs turn off Wi-Fi when entering standby mode to save power, which interrupts the network connection. Disable "Quick Start" or "Eco Mode" in the system settings if connection stability is more important than saving a few watts.
Questions and Answers (FAQ)
Is it possible to combine TVs from different brands, such as Samsung and Sony?
Yes, it's possible, but the functionality will be limited. For cross-platform integration, it's best to use a standard. DLNA to access files or intermediary applications such as Plex or Skype (for video calls). Native features like AirPlay 2 or Smart View only work within a single-brand ecosystem or require set-top boxes.
Is internet required for DLNA to work between two TVs?
No, global internet access is not required. It's enough for the router to create a local area network (LAN) and assign IP addresses to devices. All data is transferred within your home network. However, initial Smart TV setup and app updates will require internet access.
Why is there a delay in audio when connecting screens via Wi-Fi?
Latency is inherent in wireless technologies due to the time it takes to encode, transmit packets, and decode the signal. This can be critical for music. In your TV settings, try finding the "Audio Delay" or "Lip Sync" option and adjusting the value manually, or use a wired (optical) connection for audio if the TVs are located close together.
Is it possible to broadcast different images to two connected TVs?
Standard screen mirroring features transmit the same image. To display different content, you'll need a source that supports multistreaming, such as a computer with multiple video cards or a dedicated media player, or you can run content independently on each TV over a shared network (for example, different browser tabs with video).