Patent ID: 8513585

Claim:
An optical three-dimensional coordinate sensor system, comprising: a light-emitting module emitting a plurality of light signals to an object; a sensing module, comprising: a plurality of photodetectors receiving a plurality of reflected light signals reflected by the object to generate a plurality of photocurrents; a plurality of an active pixel circuits (APCs), each of the APCs being connected to one of the photodetectors for receiving the photocurrent and transforming the photocurrent to a reflective optical voltage, each of the APCs comprising at least one active transistor within a pixel unit cell; a plurality of sampling circuits, each of the sampling circuits being connected to one of the APCs for sampling and storing the reflective optical voltage, each of the sampling circuits comprising a sampling transistor and a capacitor; and a plurality of differential amplifier circuits (DACs), each of the DACs being connected to one of the sampling circuits for receiving the reflective optical voltage, each of the DACs subtracting the reflective optical voltage from a background voltage and multiplying a differential gain thereto, the DACs outputting a plurality of DAC output voltages of the reflected light signals; and a processing module connected to the sensing modules for detecting the DAC output voltages, picking up three maximum values of the DAC output voltages among all of the DAC output voltages by an algorithm, and inputting the three maximum values of the DAC output voltages into the algorithm to determine a three-dimensional coordinate of the object, wherein the photodetectors, the APCs, the sampling circuits, the DACs, and the processing module are all turned on when the light-emitting modules are emitting the light signals.