Have you ever wished you could use your laptop’s crisp display as a second screen for another computer? Maybe your desktop monitor just stopped working, or you want to extend your workspace while traveling. The good news is that repurposing your laptop as an external display is often possible, and it’s easier than you might think.
This guide will walk you through the main methods available, from simple built-in software to more traditional hardware connections. We will look at the requirements for each approach so you can choose the best one for your specific situation.
Using Built-in Software for a Wireless Setup
Modern operating systems have features designed specifically for this purpose. If both your primary computer and your laptop are running Windows 10 or 11, you can use the Project feature. First, on both devices, go to Settings > System > Projecting to this PC. Adjust the settings to allow connections. Then, on your main PC, press the Windows key + P and select “Connect to a wireless display” to find your laptop.
For those in the Apple ecosystem, Sidecar is a fantastic option. If you have a Mac and an iPad (or another Mac), you can use the iPad as a second screen wirelessly or with a cable. While this is for iPad and Mac, it shows how integrated software solutions can provide a seamless experience.
Connecting with a Cable for Lower Latency
If you need a more responsive connection, perhaps for tasks that require precise cursor movement, a physical cable is a great choice. The most common method involves an HDMI connection. However, your laptop’s HDMI port is typically an output, not an input. To use it as a screen, you need a capture card.
You would connect the HDMI cable from your main PC to the capture card, and then connect the capture card to your laptop via USB. Free software like OBS Studio can then display the video feed from the capture card in full screen, effectively turning your laptop into a monitor. It adds an extra step, but it provides a very stable and low-lag picture.
Choosing the Right Method for You
Your best option depends on your priorities. The built-in Windows projection feature is free and convenient for general tasks like having a web browser or document open on the second screen. It does require a good Wi-Fi connection. The cable and capture card method involves a small cost for the hardware but offers a more reliable and responsive experience, which is better for dynamic content.
With these methods, you can give your old laptop a new life as a handy secondary display. It is a smart way to boost your productivity without needing to buy new hardware. Try the software method first, and if you need better performance, consider the capture card route.
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