How to make a dual screen on Xiaomi Redmi Note 9: 4 working ways + setting

Xiaomi Redmi Note 9 is one of the most popular smartphones in the budget segment, but not all users know that it supports dual screen mode. This feature allows you to duplicate or expand the image to an external monitor, TV or projector, turning the phone into a full-fledged media center or workstation. MIUI not always intuitive, and some ways of connecting require additional accessories.

In this guide, we will discuss all possible methods for activating a dual screen on the Redmi Note. 9 (including Note models 9 Pro and Note 9S), The pros and cons of these problems, and the recommendations for eliminating typical problems, will be given special attention to the hidden function of Wireless Display in the Internet. MIUI 12/13/14, This is something that many users miss because of the non-obvious location on the menu.

1.What is a dual screen and why you need it on the Redmi Note 9

Dual screen (or mirroring) mode allows you to transfer the image from the smartphone to the external display in one of three modes:

• 🔄 Duplication – the TV/monitor displays exactly the same picture as the phone screen (ideal for presentations or watching videos).
• 🖥️ Extension – External screen becomes an additional workspace (useful for multitasking, such as chatting on your phone) + monitor).
• 🎮 Game mode – optimized for streaming games with minimal latency (does not work on all Redmi Note 9 models).

On the Redmi Note 9, the dual screen is implemented through:

• 📶 Wireless technologies: Miracast, Google Cast, Wi-Fi Direct.
• 🔌 Wired connections: USB-C → HDMI (via adapter, Slimport.

Main use cases:

⚠️ Note: Redmi Note 9 with Helio processor G85 (model M2003J15SC) wireless duplication can work with a delay of up to 200 ms. For games or video, it is better to use a wired connection.

Method 2: Wireless dual screen via Miracast

The most versatile method that doesn't require any accessories is Miracast, which is built into most modern TVs (Samsung, LG, Sony Bravia and projectors: both devices must be connected to the same Wi-Fi network (or the TV must support Wi-Fi Direct).

Step-by-step:

1. On the TV, activate Screen Mirroring mode (the name may differ: Miracast, Wireless Display, Smart View).
2. On Redmi Note 9, open Settings → Connections and sharing → Wireless display.
3. Turn on the Wireless Display slider and wait for the available devices to be found.
4. Select your TV from the list and confirm the connection (entry may be required). PIN-code).

If the Wireless Display item is not in the menu:

Advantages of the method:

• ✅ No wires and adapters.
• ✅ Supports sound (if the TV is compatible with Miracast Audio).
• ✅ Works at a distance of up to 10 meters.

⚠️ Note: When connecting to Xiaomi Mi TVs TV You may have a "Disconnected" error. Solution: on your TV, turn off the "Fast Connection" option in Miracast settings and try again.

3. Method 2: Wired connection through USB-C → HDMI

Minimum latency and stable image transfer (especially important for games or video games) 4K) It is better to use a wired connection. Redmi Note 9 supports video output through the port USB-C, But it requires a special adapter.

Equipment required:

• 🔌 adapter USB-C → HDMI DisplayPort Alt Mode (example: Baseus) HDMI Adapter or the original Xiaomi Mi USB-C to HDMI).
• 📺 Television/monitor with port HDMI (Preferably version 1.4 or later).

Instructions:

1. Connect the adapter to the USB-C port on your phone.
2. Connect the adapter to the TV with an HDMI cable.
3. You'll see a notification on your phone that you're connecting to the external display, and you'll click on it and select the mode: Duplicate the screen is the same on your phone and your TV. Expand the screen, and the TV becomes the second monitor.

Connection characteristics:

If the image does not appear:

Check the adapter compatibility (must support DisplayPort Alt Mode)

Restart your phone and TV

Try another one. HDMI-cable (preferably high speed)

Update your phone to the latest version MIUI

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If the adapter is warming up or the image is flashing, reduce the resolution of the external display in the phone settings: → Display. → Screen resolution (select the screen resolution) 720p instead 1080p).

4. Method 3: Using Google Cast (Chromecast)

If your TV doesn’t support Miracast, but you have a Google Chromecast device or a built-in Google Cast (like on Android TVs). TV), You can use it to duplicate the screen. This method works through the Google Home app.

Algorithm of action:

1. Install the Google Home app from the Play Market.
2. Connect the Chromecast to your TV and set it up through the app.
3. In Google Home, select your Chromecast device.
4. Click Screen Broadcast → Broadcast the screen and confirm the connection.

For the Redmi Note 9 with MIUI 14 available alternative - built-in Cast function:

1. Open the Settings. → Connections and sharing → Cast.
2. Select a Chromecast device from the list.
3. Confirm the connection (may require permission to display over other windows).

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Google Cast is convenient for streaming videos from YouTube or the browser, but is not suitable for duplicate desktop or games due to high latency.

5. Method 4: Second screen mode via USB (Slimport)

A little-known but effective way is to use Slimport technology, which allows you to transfer video over the Internet. USB-C without HDMI-This method works on the Redmi Note 9 Pro and Note. 9S, but requires a special cable.

What you need:

• 🔗 Slimport cable (e.g. LeEco) Super4K or Tronsmart Slimport).
• 🖥️ Monitor/television with port HDMI or DisplayPort.

How to connect:

1. Connect your phone to your monitor with a Slimport cable.
2. On the phone screen, select the display mode (duplication or extension).
3. If necessary, set the permission in the settings → Display. → Additionally. → Second screen.

The advantages of Slimport before HDMI-adapter:

• ⚡ More stable compound (fewer artifacts).
• 🎚️ Support for permits up to 4K@30 Hz (on Redmi Note) 9 Pro).
• 🔋 Low power consumption (doesn't drain your phone as fast as wireless methods).

⚠️ Attention: On the Redmi Note 9 (not Pro) Slimport only works in screen duplication mode. Expansion mode is available only on models with Snapdragon processor 720G (Note 9 Pro/9S).

Setting up the dual screen: resolution, sound, orientation

After successfully connecting the external display, additional adjustment of display parameters may be required. MIUI These options are hidden in several menus.

Basic parameters:

• 📏 Permission: Go to Settings → Display. → Screen resolution and choose the best for the external monitor (recommended) 1920×1080 mostly TV).
• 🔊 Sound: To play sound through the TV, open Settings → Sound. → Sound output and select HDMI or wireless display.
• 🔄 Orientation: If the image on the external screen is inverted, activate Autoturn in the notification curtain or in Settings → Display. → Crash-turn.

For the game mode (if you play with a gamepad):

1. Connect the gamepad to Bluetooth.
2. Turn on the game mode in the notification curtain.
3. In the game settings, select the output of sound on HDMI (if available).

If the external screen is displayed with black fields:

Typical problems and their solutions

Even with the right connection, Redmi Note 9 users often encounter errors.

If none of the methods worked:

• 🔄 Restart your phone and TV.
• 📱 Check if the connection is blocked by antivirus or VPN.
• 🔧 Reset network settings on your phone: Settings → System system → Reset → Resetting network settings.

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On the Redmi Note 9 with MIUI 12 and older, most dual screen problems are solved by updating the firmware to the latest version.

8. Alternative methods: applications for screen duplication

If integrated functions MIUI They don't suit you, you can use third-party apps that are suitable for specific tasks, like streaming games or remote control.

Top.-3 double-screen:

• 🎮 ApowerMirror — backup screen on a PC or Mac with the ability to control the mouse. Supports screen recording and annotations.
• 📺 TeamViewer QuickSupport – Remote phone connection from another device (useful for technical support).
• 🎬 LetsView – Minimum latency wireless broadcast to PC/TV (optimized for presentations).

How to set up ApowerMirror:

1. Install the app on your phone and PC from apowersoft.com.
2. Connect both devices to the same Wi-Fi network.
3. On your phone, launch ApowerMirror and select your PC from the list.
4. Click Start Now and confirm permission to display.

Restrictions of third-party applications:

• ❌ Requires a stable Internet connection (delays with weak Wi-Fi).
• ❌ Some functions are paid (for example, recording the screen in the 4K).
• ❌ It may not work with protected content (Netflix, Disney)+).

For gaming streaming on PC, it is better to use Scrcpy (free open source software).

Install Scrcpy on PC (Linux/macOS/Windows)

Connect your phone to USB with debugging enabled (Settings → About Phone → MIUI Version → 7 times Press → Developer Mode → Debugging over USB)


Launch the command:



scrcpy --bit-rate 8M --max-fps 60

FAQ: Frequent questions about the dual screen on the Redmi Note 9