Modern smartphones have turned into powerful multimedia centers capable of playing the highest quality content. However, the diagonal screen sizes of mobile devices often limit the viewing experience of movies or presentations. The technology Miracast solves this problem by allowing you to broadcast image and sound to a large TV or monitor screen without the use of unnecessary wires.
Unlike Chromecast, which requires an Internet connection and the use of a specific application, Miracast works directly via Wi-Fi Direct. This means that you do not need a router or access to the global network to transmit the image. The protocol creates a direct connection between the Androidsmartphone and the receiver, ensuring stable transmission of the video stream with minimal latency, which is especially important for games and demonstrations of work processes.
Before moving on to the settings, you should make sure that your equipment supports this standard. Most modern TVs from Samsung, LG, Sony and Xiaomi already have a built-in module, often hidden under the name Screen Mirroring or “Broadcast”. If you have an older model, the situation can be easily corrected using an external adapter that connects to the HDMI port.
To successfully start the broadcast, you must first prepare the equipment. Make sure that both devices - the smartphone and the TV - are in close proximity to each other. A distance of more than 5-7 meters can lead to a break in the signal or the appearance of artifacts on the screen.
Turn on the TV and go to the signal source selection menu. You need to find the app or feature responsible for your wireless connection. On different models it may be called differently: Screen Share, Miracast, Wireless Display or simply “Broadcast”. Activate this mode so that the TV goes into the connection waiting state.
On the smartphone side, you also need to perform a number of actions. Open the notification shade and find the Broadcast, Smart View, or Projection button. If such a button is not in quick access, go to the main system settings. The path usually looks like this: Settings → Connections → Broadcast. In some shells MIUI or One UI this item may be hidden inside the "Connected devices" menu.
⚠️ Attention: If you use third-party applications for broadcasting, make sure that they have the necessary screen access permissions. Some antiviruses may block an attempt to capture an image, considering it a suspicious activity.
After activating the function, the smartphone will begin searching for available devices. Your TV should appear in the list. Click on it to initiate pairing. A request to confirm the connection may appear on the TV screen - agree to it using the remote control.
The interface and names of functions may vary depending on the manufacturer of your device. Below is a table with the most common function names in the menus of different brands, which will help you find your way faster.
| Brand | Function name in the menu | Location |
|---|---|---|
| Samsung | Smart View | Notification curtain |
| Xiaomi / Redmi | Broadcast | Settings → Connected devices |
| Huawei / Honor | Projection | Notification curtain (swipe down) |
| Sony | Screen mirroring | Settings → Screen |
| Pure Android | Broadcast | Settings → Connected devices |
If the TV is not found by the search, try temporarily disabling the VPN on your smartphone. The Wi-Fi Direct protocol often conflicts with virtual networks because it changes network routes.
The quality of wireless data transmission directly depends on environmental conditions and radio channel congestion. The Miracast standard operates in the 2.4 GHz or 5 GHz frequency range. If you have many neighbors' networks in your home, interference may occur. In this case, it is worth trying to switch the router or receiver to a less busy frequency, if the equipment supports it.
One of the common problems is desynchronization of sound and image. This occurs because the video stream takes time to encode and transmit. To minimize latency, close background applications on your smartphone that may be consuming CPU resources. Also make sure that both devices have the latest software update installed.
The resolution of the broadcast image is automatically adjusted to the capabilities of the receiver, but sometimes requires manual adjustment. If the picture looks stretched or cropped, check the aspect ratio settings on your TV. This is usually done through a button Aspect or P.Size on the remote control.
☑️ Check before broadcast
Not all applications support broadcasting protected content via Miracast due to DRM (Digital Rights Management) policy. For example, Netflix or Disney+ may show a black screen instead of video when trying to duplicate the entire screen. In such cases, you need to use the built-in “Broadcast” button inside the application itself, which works on a different principle.
Frame rate is important for gamers. Standard Miracast often limits transmission to 30 frames per second, which may not be enough for fast-paced shooters. Some manufacturers are introducing proprietary extensions to achieve 60 FPS, but this requires support from both devices. Check the specifications of your Androidsmartphone in the “About phone” → “Characteristics” section.
⚠️ Attention: During an active broadcast, the smartphone screen can become very hot, since the processor works in enhanced mode. Remove the protective cover, if it is tight, and ensure air flow to the device body.
If standard system tools cannot be used, specialized applications come to the rescue. They can emulate the operation of the protocol or use alternative data transfer methods. Popular solutions include Web Video Caster, AirScreen or LocalCast.
Installation of such software is simple: find the application in Google Play Market, download and run. Most of them have an intuitive interface where you simply select the target device from a list. Some apps allow you to broadcast not only the screen, but also individual media files, which reduces network load.
It is important to note that third-party applications may contain advertising or require the purchase of a premium version to unlock full functionality. In addition, they may consume more power than built-in system tools. Use them only if the native function Miracast is unavailable or does not work correctly.
Secrets of a stable connection
For maximum stability when broadcasting heavy 4K videos, it is recommended to use a dual-band router that supports the 802.11ac or 802.11ax standard. Even if the router is not directly involved in data transmission, its presence in the environment can influence the choice of Wi-Fi Direct channel by devices. Also try not to start downloading large files on other devices on the same network while watching.
Sometimes users are faced with a situation where there is sound but no image, or vice versa. In such cases, restarting the media server service helps. This can be done by rebooting both devices. A more advanced method is to clear the cache of the “Broadcast” or “Display” application in the Android application settings, although this item is not available on all firmware.
Pay attention to the Android version. On older versions of the system (below 4.2), Miracast support may be absent or unstable. Owners of such devices should consider purchasing an external HDMI adapter with Wi-Fi support, which takes care of all signal processing, turning the phone into a simple control keyboard.
The key factor for successful broadcasting is not only the presence of the function in the menu, but also the power of the Wi-Fi module in the smartphone. Flagship models cope with stream encoding better than budget devices.
Why does the broadcast work with a delay and how to fix it?
Latency is inherent in wireless transmission technology. To reduce it, make sure you use the 5 GHz frequency if the receiver allows it. Also close all unnecessary applications on your phone. Some TVs have a “Game Mode” that disables image post-processing and reduces input lag.
Can I use Miracast if there is no Internet?
Yes, you can. The Miracast protocol uses Wi-Fi Direct technology, which creates a direct connection between devices without a router or access to the global network. The Internet is only needed for initial setup or if you are streaming online content that requires downloading data.
Is sound broadcast to external speakers?
Yes, sound is transmitted along with the video stream. Once connected to the TV, the sound from the smartphone should automatically switch to external speakers. If this does not happen, check the audio output settings in the broadcast menu or in the Android volume mixer.
Will the smartphone screen work during the broadcast?
The smartphone screen will be duplicated on the TV. You can use your phone, text or scroll through social media feeds, and all this will be visible on the big screen. To hide actions, you need to use applications that support background broadcasting, or simply not touch the phone.
How to disable broadcasting?
To disable it, just open the “Broadcast” or “Smart View” menu on your smartphone again and press the “Disconnect” or “Disconnect” button. You can also simply turn off Wi-Fi on your phone or switch the signal source on your TV.