Patent ID: 7557338

Claim:
A portable device comprising: a display on which information and/or images are displayed; a transparent surface; a lens array forming a corresponding image of an object using light received through the transparent surface; a light sensor comprising a plurality of pixels to detect the formed image of the object; a controller to use the detected image to determine a motion of the object relative to the transparent surface, and to navigate a cursor and/or a menu on the display according to the determined motion; and an aperture array between the lens array and the light sensor which selectively blocks portions of the light to prevent the portions from being received at non-selected pixels, wherein the aperture array comprises at least two sets of apertures, a first set of apertures being located at a first distance away from the light sensor and the second set of apertures being located at a second distance away from the light sensor, the first distance being different from the second distance such that light passes sequentially through the first set of apertures and then the second set of apertures.