A handheld electronic device includes a first frame, a second frame and at least a pivot mechanism. The spatial light modulator includes a support substrate and a flexible member coupled to the support substrate. Another embodiment uses simple links which are attached by pins to the existing spindle receptacles in the roll holder. The debt security is issued in exchange for value. Display output means reads the rendering image stored in the buffer and outputs the read rendering image to a display device. The inventive suspended transport apparatus has a locking safety mechanism including a track-end detector and a locking device.