Many users are familiar with the situation where their primary monitor is broken and they can't afford a new one right away. In such situations, a logical question arises: can I use the laptop screen to display the system unit's image? Fortunately, modern technology makes this possible without the need for expensive video capture cards, using standard network equipment.
Using a wireless connection opens up a wide range of possibilities for setting up a temporary workspace or game streaming. Technical implementation This process relies on transmitting a video stream over a local network, which requires a stable signal and proper configuration of both devices. Unlike a wired connection, channel bandwidth is critical here.
In this article we will look at the native tools of the operating system WindowsWe'll also explore specialized software that can help minimize latency. You'll learn how to turn your laptop into a second screen or a fully functional monitor replacement using only your home network.
Technical requirements and equipment preparation
Before you begin setting up, you need to make sure that your equipment meets the minimum requirements for comfortable operation. Wireless video transmission — is a resource-intensive process that places significant demands on the network adapter and processor. If either component is weak, you'll experience image artifacts or audio desynchronization.
Both devices must be within the range of a reliable router signal. The ideal option is to support the standard Wi-Fi 5 (802.11ac) or Wi-Fi 6, as they provide sufficient bandwidth to transmit high-resolution images. Older routers operating at 2.4 GHz may not be able to handle the data flow.
⚠️ Caution: Using Wi-Fi Guest Mode or AP Isolation on your router will block connections between devices. Make sure both computers are on the same subnet.
It's also worth checking the network card and video adapter drivers. Updated drivers Often contain optimizations for multimedia streams, which directly impacts image smoothness. Don't skip this step, as software conflicts can cause connection instability.
Built-in Projection feature in Windows 10 and 11
operating system Windows provides a built-in mechanism for wireless image transmission known as MiracastThis technology doesn't require third-party software, making it a prime candidate for quick system deployment. However, it only works between devices running Windows 10 or 11.
To start using the laptop as a monitor, you need to enable reception mode. This is done through the system settings, where you need to allow external devices to find your PC. By default, this feature may be disabled for security reasons.
On the main computer (signal source), you should press a key combination Win + KA list of available devices will appear in the "Connection" menu that opens. If the laptop is configured correctly, it will appear in the list, and once selected, the pairing process will begin.
☑️ Setting up projection in Windows
It's important to note that this method can introduce noticeable input lag. While this isn't critical for office work or video viewing, it's not suitable for fast-paced gaming. Miracast protocol Optimized for presentations, not gaming.
Using third-party software: Spacedesk and Deskreen
If built-in Windows tools are unstable or advanced settings are required, specialized programs come to the rescue. The leader in this segment is Spacedesk, which allows you to create virtual video adapters and broadcast images over the network with minimal delays.
The installation process requires installing the server driver on the host PC and the client application on the laptop. Once launched, the programs will automatically find each other on the local network. Spacedesk It is notable for the fact that it supports work via a browser if installing the client is not possible.
Another popular alternative is DeskreenThis application uses web technologies for screen streaming. It doesn't require virtual display drivers, which reduces the system load, but may consume more CPU resources to encode the video stream.
What is the difference between Spacedesk and Deskreen?
Spacedesk creates a virtual monitor within the system, allowing you to extend your desktop. Deskreen simply broadcasts the image of an existing screen or part of it, acting as a mirror or second screen via software splitting.
Comparison of connection methods: Characteristics table
Choosing the right method depends on your specific needs and equipment specifications. To help you make your decision, we've prepared a comparison chart to help you evaluate the pros and cons of each approach.
| Method | Latency | Picture quality | Difficulty of setup |
|---|---|---|---|
| Windows Projection | Average (30-50 ms) | High | Low |
| Spacedesk | Low (10-20 ms) | Customizable | Average |
| Deskreen | Average (20-40 ms) | High | Low |
| TeamViewer/AnyDesk | High (>100 ms) | Average | Low |
As you can see from the table, specialized solutions like SpacedeskFor a one-time display of documents or photos, standard tools are quite sufficient. Windows.
It's important to remember that connection quality also depends on the number of devices connected to the router. If the channel is overloaded, even the most effective method will experience intermittent performance.
Network optimization to reduce latency
To achieve the smoothest possible image, it's important to properly configure your wireless network settings. Default router settings are often focused on compatibility rather than real-time data transfer rates for large amounts of data.
It's recommended to force devices to switch to the 5 GHz band. This frequency is less crowded with household appliances and provides higher throughput. 2.4 GHz channel is often oversaturated with signals from neighboring networks, which causes interference.
⚠️ Note: Router settings interfaces are constantly being updated. The layout of menu items may vary depending on the model and firmware version. Please check the section names in your device's documentation.
It's also worth disabling power saving for the network adapter in Windows Device Manager. The power saving feature can reduce signal strength during periods of inactivity, leading to micro-disconnections when video transmission resumes.
Troubleshooting connection issues
Even if you follow all the instructions, technical issues may still occur. Most often, users encounter problems with devices simply not seeing each other on the network. This can be resolved by checking the network type: it should be marked as "Private" and not "Public."
Another common issue is low frame rate (FPS). If the image is choppy, try lowering the streaming screen resolution or color depth in the streaming software settings. This will reduce the amount of data transferred.
Windows Firewall or antivirus software may be blocking the connection. You need to add exceptions for the executable files of the software you are using (spacedeskService.exe, deskreen.exe etc.) in the incoming connection rules.
If all else fails, try temporarily disabling IPv6 in your network adapter's properties. In some home network configurations, this protocol causes conflicts when establishing a direct connection between PCs.
FAQ: Frequently Asked Questions
Can this method be used for low latency games?
You can play games, but the experience will depend on the quality of your Wi-Fi. For shooters and racing games, lag may be noticeable. Best for gaming Spacedesk with a LAN cable connection, but it is quite possible to play strategy or turn-based games via Wi-Fi.
Is internet required for local projection to work?
No, an internet connection is not required. All data is transmitted within your local area network (LAN). The main thing is that the router is turned on and transmitting a signal, even without a connection to the global network.
Will the sound be transmitted to the laptop?
Yes, most modern methods, including the built-in Windows projection and Spacedesk, support audio streaming. You'll need to select the laptop as the default playback device in the audio settings on the main PC.
Does this put a lot of strain on the laptop battery?
Receiving and decoding a video stream is a power-intensive process. A laptop screen also consumes a lot of power. It is recommended to keep the laptop connected to a charger when using it as a monitor.