Pairing an all-in-one PC with a laptop is a great way to expand your workspace without purchasing expensive equipment. Many users aren't even aware that their desktop device's powerful screen and processor can serve as an external display for a laptop. This setup is especially useful for those who work remotely or frequently commute between the office and home, wanting to maintain a familiar workspace ergonomics.
There are several ways to accomplish this task, and wireless connection This is one of the most convenient, though not without its quirks. You don't need HDMI or VGA cables; both devices need to be on the same local network. However, it's worth noting that image quality and response time directly depend on your router's bandwidth and signal stability.
In this article, we'll take a detailed look at the built-in Windows operating system features and also explore proven third-party solutions. You'll learn how to minimize input lag and achieve maximum image clarity. Attention: Before you begin setup, make sure that both devices have the latest network card driver updates installed.
Technical requirements and equipment preparation
Before you begin software configuration, you need to ensure your hardware and network infrastructure are ready to transmit video. Streaming high-resolution images places a significant strain on your network. If your router only operates in the 2.4 GHz band, image quality may be poor and your mouse cursor may become choppy.
The ideal situation is to have a dual-band router and both devices support the standard. Wi-Fi 5 (802.11ac) or newer. The all-in-one and laptop must be connected to a 5 GHz wireless network, as it provides the necessary channel bandwidth to transmit video signals without significant loss.
- πΆ Both devices must be in the same subnet (same gateway IP address).
- π» Operating system: Windows 10 or Windows 11 on both computers.
- π No active VPN connections that could block local traffic.
- π It is advisable to connect the laptop to a charger to avoid rapid discharge.
β οΈ Attention: If your all-in-one PC is very old and doesn't have built-in Wi-Fi, you'll need an external USB adapter. Built-in Ethernet ports are also suitable, but then the "wireless" connection is lost, although it will be more stable.
Also, check your firewall settings. Windows security tools often block incoming connections for the projection feature, considering them potentially dangerous. You'll need to allow device discovery on your private network.
Using the built-in "Project to this PC" feature
The simplest method that does not require installation of additional software is the use of technology Miracast, built into Windows. This feature allows you to mirror the screen of one device to another using the Wi-Fi Direct protocol. To start using it, you need to activate the signal reception mode on the all-in-one computer (which will act as a monitor).
Go to the "Settings" menu and select "System." In the list on the left, find "Projecting to this PC." If the components aren't installed, the system will prompt you to add "Wireless Display" through the Windows Update service. Once installed, select "Available anywhere on secure networks."
On the laptop whose screen you want to broadcast, press the key combination Win + KThe "Connection" panel will appear on the right side of the screen. Your all-in-one should appear in the list of available devices. Click it, and a connection confirmation prompt will appear on the all-in-one's screen.
βοΈ Check before connection
It's important to understand that this method heavily depends on the quality of your graphics card and wireless adapter drivers. In some cases, you may find that your laptop simply doesn't recognize the all-in-one PC, despite the correct settings. In this situation, resetting your network settings or temporarily disabling your antivirus software can help.
Setup via third-party programs: Spacedesk and Splashtop
If standard Windows tools are unstable or not supported by your hardware, specialized applications can help. The leader in this area is Spacedesk, which allows you to turn any screen into an additional monitor over a local network. It's more stable than standard Miracast and offers more quality settings.
To get started, download and install the server component (Spacedesk DRIVER CONSOLE) on your laptop, and the client component (Spacedesk VIEWER) on your all-in-one PC. After launching the program on both devices, the client will automatically find the server on the network. Simply click "Connect," and the second screen is ready to use.
Another popular solution is Splashtop Wired XDisplay (also has a wireless mode), which is often praised for its low latency. However, free versions of such programs may have session time or image quality limitations. Paid versions usually remove these limits and allow manual bitrate adjustments.
| Program | Connection type | Latency | Price |
|---|---|---|---|
| Windows Projection | Wi-Fi Direct | Average | For free |
| Spacedesk | Local area network | Low | Free / Pro |
| Splashtop | Local area network | Very low | Paid subscription |
| TeamViewer | Internet / LAN | High | Personal use |
When using third-party software, it's critical that your firewall doesn't block executable files. Windows usually creates rules automatically when you first start it, but if you're having trouble connecting, check the list of allowed applications in your network security settings.
Network optimization to minimize latency
The main enemy of a wireless monitor is an unstable signal and interference. Even when using the 5 GHz standard, thick walls or a microwave oven can cause micro-interruptions in the connection, resulting in artifacts on the screen. To ensure a comfortable experience, you need to configure your router correctly.
Go to your router settings (usually at 192.168.0.1 or 1.1) and find the wireless section. Make sure the channel width is set to 5 GHz. 80 MHzThis will increase throughput, but may reduce range, which isn't critical for a laptop-all-in-one PC setup in the same room.
- π Enable traffic prioritization (QoS) for devices if your router supports this feature.
- π‘ Place the router so that there are minimal obstacles between it and the devices.
- π Use a modern encryption standard WPA3 or WPA2-AES, avoiding older TKIP protocols.
β οΈ Attention: Router interfaces are constantly updated by manufacturers. The location of QoS or bandwidth settings may differ from those described. If you cannot find the exact settings, refer to your model's documentation or the manufacturer's website.
It's also worth checking whether the channel is overloaded by neighboring networks. Mobile Wi-Fi analyzer apps can be used for this purpose. If the airwaves are clogged, it's a good idea to manually switch to a clearer channel in your router settings to avoid interference.
Setting screen resolution and orientation in Windows
Once successfully connected, the all-in-one PC will become the second display in the system. However, the image may appear stretched or have black borders. To correct this, you need to properly configure the display settings. Right-click the desktop and select "Display settings."
In the window that opens, you'll see a dual-monitor setup. Select the all-in-one monitor (usually "2") and scroll down to the "Scale and Layout" section. Here, you'll need to set the recommended resolution, which is often 1920x1080 or higher, depending on the matrix of your all-in-one computer.
It's also important to adjust the screen order. Drag the numbered rectangles so that their positions correspond to the physical arrangement of the devices on your desk. This will allow the mouse cursor to smoothly transition from the laptop screen to the all-in-one screen without "teleporting" across the entire workspace.
What to do if the text is too small?
If your all-in-one has a high resolution (2K or 4K), fonts may appear microscopic. In the "Scale and Layout" section, change the value from 100% to 125% or 150% for comfortable reading.
Advanced users can adjust the refresh rate. While 120Hz or 144Hz is rarely achieved over Wi-Fi, trying 60Hz instead of 30Hz (if available) will make cursor movement much smoother. These settings are located in the "Advanced Display Settings" section.
Troubleshooting and connection diagnostics
Even with perfect setup, glitches can occur. One of the most common issues is audio desync. By default, audio may continue to play through the laptop speakers, even though the video is output to the all-in-one PC. To fix this, click the speaker icon in the system tray and select the audio output device corresponding to the all-in-one PC or the remote session.
If the connection is constantly dropping, try statically assigning IP addresses to both devices in the router settings. Dynamic address distribution (DHCP) can sometimes assign new addresses after a reboot, which disrupts Windows trusted network settings.
- π Restart both devices and the router - this solves 80% of network protocol problems.
- π‘οΈ Temporarily disable your antivirus to test the hypothesis that ports are blocked.
- π Reduce the color rendering quality in the client program settings if you experience severe lag.
When using a corporate network, administrators often block the ports required for screen sharing. In this situation, creating a direct Wi-Fi connection between a laptop and an all-in-one PC (Hotspot mode) is impossible due to limitations in Wi-Fi adapter drivers, which typically cannot simultaneously receive the internet and distribute a signal for projection.
Is it possible to use an all-in-one PC as a monitor via HDMI?
Most all-in-one PCs have an HDMI port, but it only works as an output (HDMI-Out). Only a few models have an input (HDMI-In). Check your device's specifications: if there's no input, you won't be able to use a direct cable; you'll have to use a network connection.
Why does my mouse cursor move slowly?
Cursor lag is a result of video stream compression and transmission time. Increase your Wi-Fi speed, move closer to the router, or use software with hardware encoding acceleration (NVENC/QuickSync).
Does this work over the internet and not a local network?
The native Windows and Spacedesk features only work on a local area network (LAN). Internet access requires solutions like TeamViewer, AnyDesk, or Chrome Remote Desktop, but latency will be significantly higher.
Does connecting a second screen affect laptop performance?
Yes, encoding a video stream for network transmission puts a strain on the processor and network adapter. When running heavy applications (rendering, gaming), the host system's performance may drop by 10-15%.