The technology underlying the modern optical computer mouse is known as digital image correlation, a technology pioneered by the defense industry for tracking military targets. S5085 optical sensor IC die (CMOS sensor + driver) Other manufacturers soon followed Microsoft's lead using components manufactured by the HP spin-off Agilent Technologies, and over the next several years mechanical mice became obsolete. It worked on almost any surface, and represented a welcome improvement over mechanical mice, which would pick up dirt, track capriciously, invite rough handling, and need to be taken apart and cleaned frequently. The first commercially available, modern optical computer mice were the Microsoft IntelliMouse with IntelliEye and IntelliMouse Explorer, introduced in 1999 using technology developed by Hewlett-Packard. A surface-independent coherent light optical mouse design was patented by Stephen B. This advance enabled the mouse to detect relative motion on a wide variety of surfaces, translating the movement of the mouse into the movement of the cursor and eliminating the need for a special mouse-pad. As computing power grew cheaper, it became possible to embed more powerful special-purpose image-processing chips in the mouse itself. Modern surface-independent optical mice work by using an optoelectronic sensor (essentially, a tiny low-resolution video camera) to take successive images of the surface on which the mouse operates. Microscope photograph of the IntelliMouse Explorer sensor silicon die

The Kirsch and Lyon mouse types had very different behaviors, as the Kirsch mouse used an x-y coordinate system embedded in the pad, and would not work correctly when the pad was rotated, while the Lyon mouse used the x-y coordinate system of the mouse body, as mechanical mice do. Lyon of Xerox, used a 16-pixel visible-light image sensor with integrated motion detection on the same n‑type ( 5 µm) MOS integrated circuit chip, and tracked the motion of light dots in a dark field of a printed paper or similar mouse pad. Predictive algorithms in the CPU of the mouse calculated the speed and direction over the grid. One of these, invented by Steve Kirsch of MIT and Mouse Systems Corporation, used an infrared LED and a four-quadrant infrared sensor to detect grid lines printed with infrared absorbing ink on a special metallic surface. The first two optical mice, first demonstrated by two independent inventors in December 1980, had different basic designs: An early Xerox optical mouse chip, before the development of the inverted packaging design of Williams and Cherry

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