Patent number 8541727 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Optical navigation sensors are commonly used in devices, such as an optical computer mouse, trackball or touch pad, for interfacing with personal computers and workstations. One technology used for optical navigation sensors relies on sensing light reflected from a surface using an array of photosensitive elements or detectors, such as photodiodes. Generally, outputs of the individual elements in the array are combined using signal processing circuitry to detect and track motion of a pattern or image in the reflected light and from that tracking to derive the motion of the surface relative to the array.
"The optical navigation sensor described above will receive very weak signals when tracking on dark surfaces, and is subject to signal saturation when tracking on light surfaces. When this happens, the estimation of displacements become erratic and unreliable, hence affecting the overall performance of the optical navigation sensor."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "A gain control circuit is used to control strength of signals from an array of photo-detectors (PDs) in an optical navigation sensor. Generally, the circuit includes a number of transimpedance-amplifiers (TIAs) each comprising an input coupled to at least one of the PDs in the array to receive a current signal therefrom and generate an automatic gain control (AGC) signal in response thereto, and a controller coupled to outputs of the number of TIAs to receive the AGC signal therefrom. The controller includes logic to execute a signal gain adjustment algorithm and to adjust a gain of a signal processor coupled to the array of PDs in response to the AGC signal."
URL and more information on this patent, see: Xu, Yansun; Sanders, Steven; Trisnadi, Jahja. Signal Monitoring and Control System for an Optical Navigation Sensor. U.S. Patent Number 8541727, filed
Keywords for this news article include: Electronics,
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