A flexible device that includes a flexible display panel bent to have a curved surface and a supporting member provided at one end of the flexible display panel. The drive system can include: an active front end adapted to receive an AC voltage and output a substantially constant DC voltage; and a DC chopper coupled to the active front end, the DC chopper adapted to receive the substantially constant DC voltage and output a variable DC voltage. The boom is attached to the base and has a length and a convex curvature and defines a plurality of holes along all or a portion of the length. For example, one device may be permitted to communicate with another device only if they are members of a common zone. A compound optical coupler is also described, which has a self-wetting clear optical coupling gel and an elastomeric load ring.