Hinged portable electronic device with display circuitry located in base

An electronic device may have a housing with a lid (12A) that rotates relative to a base (12B). A display in the lid may have a thin-film transistor layer. Display driver circuitry may be mounted to the thin-film transistor layer. A display timing controller integrated circuit (34) may be mounted in the base. A rigid flex printed circuit may have a rigid portion in the base (90-4) to which the display timing controller integrated circuit is mounted and may have a rigid portion in the lid (90-2). A flexible printed circuit portion (90-1) of the rigid flex printed circuit may be used to couple the rigid printed circuit portion in the lid to the thin-film transistor layer. A flexible printed circuit portion (90-3) of the rigid flex printed circuit that extends between the lid and the base may be formed from a double-shield-layer single-signal-line-layer flexible printed circuit.