Rigid flex printed circuit boards are boards using a combination of flexible and rigid board technologies
in an application. Most rigid flex boards consist of multiple layers of
flexible circuit substrates attached to one or more rigid boards
externally and/or internally, depending upon the design of the
application. The flexible substrates are designed to be in a constant
state of flex and are usually formed into the flexed curve during
manufacturing or installation.
Rigid flex designs are more challenging than the PCB design of a typical rigid board environment, as these boards are designed in a 3D space, which also offers greater spatial efficiency. By being able to design in three dimensions rigid flex designers can twist, fold and roll the flexible board substrates to achieve their desired shape for the final application's package.