A USB to HDMI converter is a small hardware device that changes a computer's USB data signal into an HDMI video and audio signal. [1] ( ), [2] ( )How It WorksExternal GPU: Standard USB (Type-A or USB-C without video support) uses an internal chip (like DisplayLink) to act as a mini external graphics card.DisplayPort Alt Mode: Modern USB-C ports that support video output send native display signals directly without extra processing