Abstract: A display control for a data storage device which includes a screen portion for visually displaying a part of a virtual page. The display control includes at least one sensor mounted on the device and configured to sense changes in position of the device in a reference coordinate system and transmit signals indicative of the changes. A control circuit is adapted to pan the virtual page over the screen portion responsive to signals from the sensor indicative of the position changes when the control circuit is in a panning mode. At least one touch-responsive first area on the screen portion when touched places the control circuit in the panning mode, and a touch-responsive second area on the screen portion when touched placing the control circuit out of the panning mode.

Abstract: A portable display device is provided having a size suitable for hand-held use and including a display screen for displaying video images and audio circuitry for providing audio signals to a user thereof. A manual input device is mounted on the portable display device and is activatable by a user for placing the portable display device in any one of a plurality of modes of operation selected from the group consisting of paging, volume control, brightness control and zoom. A sensor, also mounted on the portable display device, is configured to sense changes in tilt of the portable display device relative to a reference tilt established upon placing the portable display device in one of the plurality of modes of operation. A control is connected to the sensor and is adapted to modify parameters associated with a mode of operation selected from the plurality of modes of operation in response to the sensor sensing tilt changes when the portable display device is in the selected mode of operation.