Patent ID: 7712046

Claim:
A data processing device having a display screen and user input device, said device being configured to provide a display screen magnifier which is controllable by a user to magnify selected portions of a desktop including windows open on said screen, said magnifier providing a moveable magnifier frame within which a magnified image is presented, said image corresponding to screen content located within a magnification region underlying said magnifier frame, magnified to a set level of magnification, said magnification region being moveable within said magnifier frame in proportion to the movement of the magnifier frame on said display screen, wherein, when said magnifier frame reaches a first edge of said display screen such that a horizontal edge of said magnifier frame is coincident with a horizontal edge of said display screen, a horizontal edge of said magnification region is coincident with said horizontal edge of said magnifier frame, and, when said magnifier frame reaches a second edge of said display screen such that a vertical edge of said magnifier frame is coincident with a vertical edge of said display screen, a vertical edge of said magnification region is coincident with said vertical edge of said magnifier frame, wherein: a cursor of a user input device is moveable across said screen display into and out of said magnification region, and wherein when the position of said cursor falls within said magnification region said cursor appears within the magnified image presented within the magnifier frame; and the size of said magnification region in relation to the magnifier frame varies in inverse proportion to a magnification ratio of the magnifier, such that a lens shadow area is defined between the magnifier frame and the magnification region, and wherein when said cursor passes into the lens shadow area, the magnifier transposes the cursor position to a corresponding position at the edge of the magnification region.