A modular display system and method assembles an external interface module with a display module to support built-to-order display configurations. The display module has display panel, timing controller and speaker components assembled in a display module housing that accepts a single LVDS and a single audio interface. The external interface module couples to the display module housing to form an integral display system. Selective assembly of the display system from plural types of external interface modules allows selective configuration of the display system with various television and information handling system display functionalities, such as to fill a purchaser order in a build-to-order manufacturing process.