Professionals such as auditors and consultants who may frequently be required to work at various locations will know that a portable USB monitor used with a laptop helps to greatly increase work efficiency. This is made possible by technology DisplayLink developed to compress video data and pump it over a USB link, where it is uncompressed and decoded by a specialized chip made by the company.
By embedding a DisplayLink chip into an energy-efficient LCD monitor and drawing power directly from the USB interface, manufacturers have been able to come up with portable USB monitors that can fit into the same size bag as a laptop. Moreover, the availability of faster CPUs on laptops and the high bandwidth available in USB 2.0 and USB 3.0 means that the usage experience no different than that of a conventional monitor for most users-and can even allow for video playback on external monitors.
Models include the Field Monitor Pro, a 4-pound portable monitor that packs a larger 15.4-inch screen and folks shut like a laptop for stowing away, and the Lenovo ThinkVision LT1421 USB monitor, which tips the scales at just 1.91 pounds (0.87kg) and draws its power entirely from the USB port. Since older laptops may not deliver sufficient current from a single USB port, the ThinkVision and other models typically come equipped with a two-pronged USB cable to alleviate this problem and make it possible to use multiple displays.
3. The Matrox Graphic eXpansion Module
If you don't need portability but use a laptop at your workstation you'll appreciate the Graphic eXpansion Module (GXM) technology developed by Matrox Graphics. The technology works by means of a small GXM appliance connected to the laptop's display output, where it masquerades as a monitor with an extraordinarily high resolution. Depending on whether the DualHead2Go DisplayPort or TripleHead2Go DisplayPort adapter is deployed, the USB-powered GXM will split up this high-resolution output and deliver it to either two or three side-by-side monitors that are connected to its own video output ports.