Patent ID: 7483018

Claim:
A method for utilizing a pen, comprising: receiving, by an imager integrated circuit of a pen in a first mode of operation, light reflected from a surface at a first frame rate, wherein the reflected light identifies a pattern embedded in the surface, the embedded pattern indicating at least one position on the surface; storing a first set of pixels representing the reflected light in a first memory; determining, by a processing integrated circuit coupled to the imager, an absolute position of the pen from the reflected light; receiving a request to enter a second mode; receiving, by the imager integrated circuit of the pen in the second mode, laser light reflected from the surface at a second frame rate, wherein the reflected laser light identifies a speckle pattern; storing a second set of pixels representing the speckle pattern in a second memory; and determining, by a laser processing integrated circuit from the set of pixels representing the speckle pattern, a relative position of the pen, wherein the second memory, the laser processing integrated circuit and the imager integrated circuit are fabricated on the same die, further wherein the first frame rate is less than the second frame rate and the first set of pixels is larger than the second set of pixels.