Yes, DisplayPort can charge a laptop, but specifically when implemented over a USB Type-C (USB-C) connection.
While the standard DisplayPort connector (the rectangular one with one beveled corner) is primarily designed for video and audio signals, the DisplayPort over USB-C alternate mode leverages the capabilities of the versatile USB-C port.
How DisplayPort Over USB-C Enables Charging
The key to charging lies not just in the DisplayPort signal itself, but in its combination with the power delivery features inherent to the USB-C standard.
As the reference states: "Combined with the USB Type-C connector's high-speed data transfer and power delivery functions, DisplayPort over USB-C also enables single-port devices to deliver docking, charging, and data-transferring capabilities simultaneously."
This means that a single USB-C port supporting DisplayPort Alt Mode and USB Power Delivery (USB PD) can handle multiple functions:
- Video Output: Sending display signals using the DisplayPort protocol.
- Data Transfer: Connecting peripherals or transferring files at USB speeds.
- Power Delivery: Receiving power to charge the laptop from a compatible monitor, dock, or power adapter connected via the same USB-C cable.
DisplayPort vs. DisplayPort Over USB-C
It's crucial to distinguish between the two:
- Standard DisplayPort Connector: This port (found on older laptops, desktops, and monitors) is for video and audio only. It cannot charge a laptop.
- USB-C Port (with DisplayPort Alt Mode & USB PD): This port can output DisplayPort video, transfer data, and receive power to charge the laptop, provided the connected device (monitor, dock, charger) also supports USB PD.
Here's a quick comparison:
| Feature | Standard DisplayPort Port | USB-C Port (with DisplayPort Alt Mode & USB PD) |
|---|---|---|
| Video/Audio | Yes | Yes (using DisplayPort Alt Mode) |
| Data Transfer | No | Yes |
| Laptop Charging | No | Yes (using USB PD) |
Practical Implications and Examples
This capability is common in modern laptops, ultrabooks, and 2-in-1 devices that feature USB-C or Thunderbolt ports.
- Monitor Charging: You can connect your laptop to a compatible monitor using a single USB-C cable, and the monitor can simultaneously display video, act as a USB hub, and charge your laptop.
- Docking Station Charging: Many USB-C or Thunderbolt docking stations allow you to connect your laptop with one cable to multiple peripherals, external displays, and power, charging your laptop through the dock.
- Simplified Setup: This reduces cable clutter by combining power, data, and video into one connection.
To use this feature, ensure your laptop's USB-C port supports DisplayPort Alt Mode and USB Power Delivery, and that the connected device (monitor, dock, charger) also supports USB PD with sufficient wattage for your laptop.
In summary, while the DisplayPort standard itself is for display signals, its implementation over the versatile USB-C connector, coupled with USB Power Delivery, allows for simultaneous video, data, and charging capabilities, including powering a laptop.
