Charge pump circuitry includes a master charge pump including a voltage multiplier and charge pump which operate to produce a boosted, unregulated voltage, and also includes a slave charge pump including a voltage multiplier and charge pump which operate to produce a boosted control voltage which then is filtered. The width of the p-cladding layer is increased in a portion corresponding to the phase shift structure of the diffraction grating layer. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. The first minor axis 27\u2032 and said second minor axis 27\u2033 are merged to form a common minor axis 27. In response to detecting the finger gesture on the touch-sensitive display at the location that corresponds to the folder icon, the device determines a respective item in the plurality of items in the folder that corresponds to the detected finger gesture and activates the respective item.