Optical sensor array apparatus

An optical sensor array apparatus, comprising:

• a plurality of sensor pixels arranged in an array, constituting a sensor array used to receive lights reflected from a surface;
• wherein the sensor array includes multiple dummy sensor pixels disposed around the sensor array;
• a plurality of comparators, wherein every comparator is disposed with respect to one sensor pixel and used to compare two input signals respectively from the every sensor pixel and a statistic average;
• a light-source component, used to generate the lights emitted to the surface, wherein the light-source component generates a coherent light with good spatial coherence;
• and
• a control circuit, electrically connected to the plurality of sensor pixels, the comparators and the light-source component, used to configure the light-source component to emit the lights and receive energy signals retrieved from the sensor pixels;
• wherein the control circuit determines an energy difference from spatial interference induced by the reflected light as the coherent light allows enhancing the interference;
• wherein, the control circuit calculates the statistical average by averaging the energy signals received by all or part of the non-dummy sensor pixels after receiving the energy signals from the sensor pixels, and an energy state for the every sensor pixel is defined according to the energy difference between the statistical average and the energy signal of every sensor pixel, and there are two types of energy states represented by binary characteristic values, in which change of the energy states for the sensor pixels in the array within a period of a sampling time shows a transition of a movement of the optical sensor array apparatus.