Having multiple monitors can dramatically boost your productivity, whether you’re a creative professional, a student juggling research papers, or someone who simply enjoys having more screen real estate. But buying a new monitor can be expensive. What if you could repurpose that old laptop gathering dust in your closet? The good news is, you absolutely can! This guide will walk you through various methods to transform your aging laptop into a valuable second display.
Why Use Your Old Laptop as a Second Monitor?
Before diving into the “how-to,” let’s quickly recap why this is a brilliant idea. The primary benefit is increased productivity. Imagine having your email and chat windows open on one screen while working on a document or editing photos on the other. It eliminates the constant Alt-Tab struggle and keeps you focused.
It’s also an eco-friendly and cost-effective solution. Instead of contributing to electronic waste, you’re giving your old device a new lease on life. Plus, you’re saving money that would otherwise be spent on a brand new monitor. Finally, it offers portability. A dedicated second monitor is usually stationary. Using a laptop means you can, to some extent, create a dual-screen setup even when you’re not at your primary desk.
Methods for Connecting Your Laptop as a Second Monitor
Several approaches can be taken to connect your old laptop to your main computer. Each has its advantages and disadvantages, depending on your operating systems, available hardware, and technical comfort level. We’ll cover the most common and reliable methods.
Using Windows Built-in Features: Projecting to Another Screen
Windows offers a built-in feature called “Projecting to this PC,” allowing you to wirelessly connect another Windows device as a second screen. This is often the simplest option if both your main computer and old laptop are running relatively recent versions of Windows.
Enabling Projecting to This PC on the Old Laptop
First, you need to enable this feature on your old laptop (the one you want to use as the second monitor).
- Go to the Settings app (Windows key + I).
- Click on System.
- Select Projecting to this PC.
Here, you’ll find several settings.
- “Some Windows and Android devices can project to this PC when you say it’s OK.” Change the first dropdown menu to “Available everywhere” or “Available everywhere on secure networks.” The latter is recommended for security if you’re often on public Wi-Fi.
- “Ask to project to this PC”: Choose “First time only” or “Every time a connection is required.” “First time only” is more convenient but less secure.
- “Require PIN for pairing”: This adds an extra layer of security. Enable it if you want to prevent unauthorized connections.
- “This PC can be discovered for projection only when it is plugged into a power source”: It is recommended to choose this setting to prevent draining the laptop battery fast.
Note the PC name displayed at the bottom of this settings window. You’ll need this in the next step.
Connecting from Your Main Computer
Now, on your main computer, follow these steps:
- Press the Windows key + P to open the Projection settings.
- Select “Connect to a wireless display.”
- Your main computer will scan for available devices. Your old laptop’s name (the one you noted earlier) should appear in the list.
- Click on your old laptop’s name.
- You may be prompted to enter a PIN on either device if you enabled that security feature.
- Once connected, you can choose how to extend your display:
- Duplicate: Shows the same content on both screens.
- Extend: Extends your desktop across both screens. This is the most useful option for productivity.
- Second screen only: Shows your desktop only on the old laptop screen.
- PC screen only: Disables the second screen.
Choose “Extend” to use your old laptop as a true second monitor.
Troubleshooting Wireless Projection
Wireless projection relies on a stable Wi-Fi connection. If you experience lag or disconnections, try the following:
- Ensure both devices are connected to the same Wi-Fi network.
- Move closer to your Wi-Fi router.
- Reduce interference from other wireless devices.
- Restart both computers.
- Update your Wi-Fi drivers.
Using a Software Solution: Third-Party Apps
Several third-party apps are designed to turn a laptop into a second monitor, often with more features and flexibility than the built-in Windows option. These apps typically work by creating a virtual display on the main computer and then streaming the content to the laptop.
Popular Options
- Spacedesk: This is one of the most popular and often recommended options, and it’s free for personal use. Spacedesk works by installing server software on your main computer and client software on your old laptop. It supports both Windows and Android devices.
- Duet Display: Duet Display is a paid app known for its performance and reliability. It uses a wired USB connection for minimal latency and supports both Windows and macOS.
- iDisplay: iDisplay is another paid option that works wirelessly or via USB. It supports Windows, macOS, and Android.
Setting Up Spacedesk: A Step-by-Step Guide
Let’s walk through the process of setting up Spacedesk, as it’s a free and effective option.
- Download Spacedesk Driver Server: On your main computer, go to the Spacedesk website and download the driver server software for your version of Windows. Install it. You may need to restart your computer after installation.
- Download Spacedesk App (Client): On your old laptop (the one you want to use as the second monitor), download the Spacedesk app. This is the “client” software. You can find it on the Spacedesk website or in the app store for your operating system (e.g., Google Play Store if it’s an Android device).
- Connect: Ensure both devices are on the same Wi-Fi network. Open the Spacedesk app on your old laptop. It should automatically detect your main computer running the Spacedesk server.
- Connect: Click on the connection button (usually a “Connect” or “Start” button) to initiate the connection.
- Configure Display Settings: Once connected, your old laptop should act as a second monitor. Go to your main computer’s display settings (right-click on the desktop and select “Display settings”) to arrange and configure the displays as needed.
Advantages of Software Solutions
- Cross-platform compatibility: Some apps support Windows, macOS, and even Android, allowing you to use a wider range of devices as second monitors.
- Wired and wireless options: Depending on the app, you can choose between a wired USB connection for lower latency or a wireless connection for more flexibility.
- Advanced features: Some apps offer features like touch input support, pressure sensitivity (for drawing tablets), and customizable resolutions.
Disadvantages of Software Solutions
- Performance: Wireless connections can be susceptible to lag and disconnections, especially with older hardware or congested Wi-Fi networks.
- Cost: Many of the best apps are paid, requiring a one-time purchase or subscription.
- Driver compatibility: Some apps may have compatibility issues with certain graphics cards or operating systems.
Using a Hardware Solution: HDMI Capture Card (Less Common)
While less common and potentially more expensive, an HDMI capture card can be used to turn your old laptop into a second monitor. This method essentially treats your laptop as an external display, similar to a TV or monitor.
How it Works
An HDMI capture card takes video input from your main computer’s HDMI output and converts it into data that your old laptop can display. The laptop essentially acts as a monitor displaying the video feed from the capture card.
Pros and Cons
- Pros: Potentially lower latency than wireless solutions, compatibility with virtually any device with an HDMI output.
- Cons: Requires additional hardware (the capture card), can be more complex to set up, and may not offer the same level of flexibility as software solutions. It might not support extended desktop features in the same way.
This method is generally recommended only if you have specific needs, such as capturing video from a game console or another device, and want to use your old laptop as a display.
Optimizing Performance and Display Settings
Regardless of the method you choose, optimizing your settings can significantly improve the experience of using your old laptop as a second monitor.
Adjusting Resolution and Refresh Rate
In your main computer’s display settings, make sure the resolution and refresh rate of your old laptop’s display are set appropriately. A lower resolution can reduce the load on your system and improve performance, especially if your old laptop has limited processing power.
Positioning Your Displays
In the display settings, you can drag and arrange the display icons to match the physical arrangement of your monitors. This ensures that your mouse cursor moves seamlessly between screens.
Extending vs. Mirroring
As mentioned earlier, “Extend” mode is generally the most useful for productivity. It allows you to have different applications open on each screen. “Mirror” mode (or “Duplicate”) simply duplicates the same content on both screens, which can be useful for presentations but less so for everyday multitasking.
Taskbar Settings
You can customize the taskbar to appear on both screens or only on your main display. Right-click on the taskbar, select “Taskbar settings,” and adjust the “Multiple displays” options to your preference.
Common Problems and Solutions
Even with the best setup, you might encounter some issues. Here are a few common problems and their solutions:
- Lag or slow performance: Try reducing the resolution, closing unnecessary applications, and ensuring both devices are on a stable network. A wired connection (USB or Ethernet) is usually faster than Wi-Fi.
- Disconnections: Check your Wi-Fi connection, update drivers, and try restarting both devices. If using a wireless app, ensure it’s not being blocked by your firewall.
- Display issues (incorrect resolution, flickering): Update your graphics drivers and try different resolution settings.
- Sound issues: Make sure the correct audio output device is selected in your system settings.
Security Considerations
When using your old laptop as a second monitor, especially wirelessly, be mindful of security.
- Use a strong password for your Wi-Fi network.
- Enable the PIN option for wireless projection in Windows to prevent unauthorized connections.
- Keep your operating system and software up to date to patch security vulnerabilities.
- Be cautious when connecting to public Wi-Fi networks.
- Consider using a VPN for added security when transmitting sensitive data.
Conclusion
Turning your old laptop into a second monitor is a fantastic way to boost your productivity, save money, and reduce electronic waste. Whether you choose the built-in Windows features, a third-party app, or even an HDMI capture card, the benefits of having extra screen real estate are undeniable. By following the steps outlined in this guide and troubleshooting any issues that arise, you can create a seamless and efficient dual-screen setup that enhances your workflow. Remember to prioritize security and optimize your settings for the best possible experience. Give your old laptop a new purpose and enjoy the benefits of a multi-monitor workstation!
What software do I need to turn my old laptop into a second monitor?
Several software options enable you to use your old laptop as a secondary display. Popular choices include Spacedesk, Duet Display, and Splashtop Wired XDisplay. These programs generally work by installing a server application on your old laptop (the secondary display) and a client application on your primary computer. The specific installation process and setup steps vary slightly depending on the software you choose, but they all aim to establish a connection allowing the primary computer to recognize the laptop as an external monitor.
Spacedesk is a particularly popular free option, although its performance can depend heavily on network connection quality. Duet Display offers a paid version with enhanced features and is known for its responsiveness, especially when using a wired connection. Splashtop Wired XDisplay is another option focused on a wired connection for optimal performance. It’s important to research each option and select the one that best suits your needs and system requirements.
Will this work with any operating system?
The compatibility of using your old laptop as a second monitor depends on the operating systems running on both your primary computer and the old laptop. Most of the popular software solutions, like Spacedesk and Duet Display, support a wide range of operating systems including Windows, macOS, and Android. However, it’s essential to check the specific system requirements of the software you choose before installation. Older operating systems might not be supported by the latest software versions.
Furthermore, the method of connection (wired or wireless) can also influence compatibility. While wireless connections offer more flexibility, they might require specific network configurations and can be less stable than wired connections. Therefore, carefully assess your hardware and software setup and verify compatibility with the chosen solution to ensure a seamless experience.
Does using an old laptop as a second monitor affect performance?
Yes, utilizing an old laptop as a second monitor can impact the performance of both the primary and secondary devices. The extent of the performance impact depends on several factors, including the hardware capabilities of both machines, the connection type (wired or wireless), and the software being used. Processing power is required to encode and transmit the display data from the primary computer to the secondary laptop, and this can consume CPU and GPU resources.
Furthermore, the network bandwidth or USB connection speed also plays a crucial role. A weak Wi-Fi signal or a slow USB port can cause lag and latency, negatively affecting the overall experience. To minimize the impact, consider using a wired connection whenever possible and closing unnecessary applications on both computers. You can also adjust the resolution and refresh rate of the secondary display to reduce the strain on your system.
Is it better to use a wired or wireless connection?
Generally, a wired connection is preferable to a wireless connection when using an old laptop as a second monitor. Wired connections, such as USB, offer greater stability and lower latency compared to wireless connections. This means that the display information is transmitted more quickly and reliably, resulting in a smoother and more responsive experience. Wireless connections, particularly over Wi-Fi, are susceptible to interference and fluctuations in signal strength, which can cause lag, delays, and even disconnections.
However, the convenience of a wireless connection might be appealing if you prioritize portability and flexibility. If you opt for a wireless connection, ensure that both devices are connected to a strong and stable Wi-Fi network. Consider using a 5 GHz network if available, as it generally offers less interference than a 2.4 GHz network. Test both connection types to see which provides better performance with your specific setup.
What if the software doesn’t detect my old laptop?
If the software fails to detect your old laptop, several troubleshooting steps can be taken to resolve the issue. First, ensure that both the server application on the old laptop and the client application on the primary computer are installed correctly and are running the latest versions. Restart both devices and try reconnecting. Verify that both computers are connected to the same network if using a wireless connection, or that the USB cable is properly connected if using a wired connection.
Firewall settings can sometimes block the communication between the two devices. Check your firewall settings on both computers and ensure that the software used to connect the displays is allowed through the firewall. It’s also possible that conflicting drivers or other software are interfering with the connection. Temporarily disable any recently installed software or drivers that might be causing conflicts. If the problem persists, consult the software’s documentation or support forums for specific troubleshooting guidance.
Can I use the old laptop’s keyboard and mouse with my primary computer?
While the primary function of using an old laptop as a second monitor is to extend your display, some software solutions also offer the ability to share the laptop’s keyboard and mouse with your primary computer. This feature typically involves installing additional software or drivers that enable keyboard and mouse input to be redirected to the primary machine. The exact setup process varies depending on the software used.
However, it’s important to note that using the old laptop’s keyboard and mouse in this way may not be as seamless as using dedicated peripherals connected directly to the primary computer. There might be some lag or delay in input, particularly when using a wireless connection. Consider testing the functionality thoroughly to ensure that it meets your needs before relying on it for critical tasks.
What resolution and refresh rate should I use on the old laptop?
Choosing the optimal resolution and refresh rate for your old laptop when used as a second monitor depends on several factors, including the laptop’s display capabilities, the performance of both computers, and your personal preferences. Start by setting the resolution to the native resolution of the old laptop’s screen. This will ensure the sharpest and clearest image quality. Experiment with lower resolutions if performance is an issue.
The refresh rate determines how many times per second the display updates. A higher refresh rate results in smoother motion, which is particularly important for tasks like gaming or watching videos. However, a higher refresh rate also puts more strain on the system. If your old laptop has a limited refresh rate or if you experience performance issues, consider lowering it to 60Hz or even lower. Balancing image quality and performance is key to finding the optimal settings for your specific setup.