LIGHT SOURCE CONTROL IN OPTICAL POINTING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain an optical pointing device with higher stability and lower cost.

SOLUTION: The optical pointing device includes a light source configured to respond to a drive current to generate at least partially coherent light to illuminate an imaging surface to thereby generate reflected images. A navigation sensor is configured to generate digital images based on the reflected images, and generate movement data based on the digital images that is indicative of relative motion between the imaging surface and the optical pointing device. A light source drive circuit is configured to provide the drive current to the light source. A drive current controller is configured to calibrate the drive current based on selected digital images.

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