Optical three-dimensional coordinate sensor system and method thereof
First Claim
1. 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.
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Abstract
The present invention relates an optical three-dimensional coordinate sensor system and method thereof. A plurality of light-emitting modules produce a plurality of light signals, and then a plurality of reflected light signals reflected by an object are received by a plurality of photodetectors. After receiving the reflected light signals, the photodetectors generate a plurality of photocurrents. A plurality of active pixel circuits receive the photocurrents and transform the photocurrents to a plurality of reflective optical voltages. A plurality of differential amplifier circuits (DAC) compare the reflective optical voltages and the background voltages, and then output a plurality of DAC output voltages of the reflected light signals. Afterward, a processing module detects the DAC output voltages and uses an algorithm to calculate the top three of the DAC output voltages to determine the three-dimensional coordinate of the object.
25 Citations
20 Claims
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1. An optical three-dimensional coordinate sensor system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical three-dimensional coordinate sensing method, comprising the following steps:
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a light-emitting module emitting a plurality of light signals to an object; each one of a plurality of photodetectors receiving a plurality of reflected light signals reflected by the object and generating a photocurrent; each one of a plurality of active pixel circuits (APCs) receiving the photocurrent of the corresponding photodetector and transforming the photocurrent to a reflective optical voltage; each one of a plurality of sampling circuits sampling and storing the reflective optical voltage of the corresponding photodetector; each one of a plurality of differential amplifier circuits (DACs) subtracting the reflective the optical voltage of the corresponding sample circuit from a background voltage and multiplying a differential gain thereto to output a differential amplifier circuit (DAC) output voltage of the reflected light signals by each of a plurality of differential amplifier circuits (DACs); and a processing module detecting the DAC output voltages and using an algorithm to calculate three maximum values of the DAC output voltages 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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification