Can I use this device to increase the maximum number of displays that my video card supports?

No, you cannot use this device to increase the maximum number of displays that a video card supports. For example, if your video card only supports up to three displays and you add this device to your setup, your display limit is still three displays. If you have connected more than one of this device to the same computer and are experiencing display issues, you should make sure that your video card can support the number of displays that you are using in your setup.