A three-dimensional, 3D, image sensor module comprising: an oscillator configured to output a distortion-compensated oscillation frequency as a driving voltage (Vdrv) of a sine wave biased with a bias voltage (Vbias); an optical shutter configured to vary its transmittance of reflective light (RLIT) reflected from a subject, according to the driving voltage, by modulating the reflective light into at least two optical modulation signals having different phases; and an image generator configured to process the optical modulation signals to generate image data about the subject, the image data including depth information that is calculated based on a difference between the phases of the at least two optical modulation signals; wherein the optical shutter has electrical characteristics represented by an equivalent resistor and an equivalent capacitor, and the oscillator comprises: a resonator configured to resonate via an energy exchange with the optical shutter to generate the driving voltage; an energy supplementer configured to supply, to the resonator, replacement energy corresponding to an amount of energy lost during the energy exchange between the resonator and the optical shutter; and a distortion compensator configured to compensate for a distortion of the energy supplied by the energy supplementer to the resonator; wherein the optical shutter comprises a first end and a second end, and the resonator comprises: an inductor (Lr) comprising a first end electrically connected to the first end of the optical shutter and a second end; and a capacitor (Cr) comprising a first end that is electrically connected to the second end of the inductor, and a second end connected to the bias voltage and the second end of the optical shutter; and wherein the energy supplementer is further configured to supply energy to the capacitor via the inductor when energy is exchanged between the capacitor and the equivalent capacitor of the optical shutter. an oscillator configured to output a distortion-compensated oscillation frequency as a driving voltage (Vdrv) of a sine wave biased with a bias voltage (Vbias); an optical shutter configured to vary its transmittance of reflective light (RLIT) reflected from a subject, according to the driving voltage, by modulating the reflective light into at least two optical modulation signals having different phases; and an image generator configured to process the optical modulation signals to generate image data about the subject, the image data including depth information that is calculated based on a difference between the phases of the at least two optical modulation signals; wherein the optical shutter has electrical characteristics represented by an equivalent resistor and an equivalent capacitor, and the oscillator comprises: a resonator configured to resonate via an energy exchange with the optical shutter to generate the driving voltage; an energy supplementer configured to supply, to the resonator, replacement energy corresponding to an amount of energy lost during the energy exchange between the resonator and the optical shutter; and a distortion compensator configured to compensate for a distortion of the energy supplied by the energy supplementer to the resonator; a resonator configured to resonate via an energy exchange with the optical shutter to generate the driving voltage; an energy supplementer configured to supply, to the resonator, replacement energy corresponding to an amount of energy lost during the energy exchange between the resonator and the optical shutter; and a distortion compensator configured to compensate for a distortion of the energy supplied by the energy supplementer to the resonator; wherein the optical shutter comprises a first end and a second end, and the resonator comprises: an inductor (Lr) comprising a first end electrically connected to the first end of the optical shutter and a second end; and a capacitor (Cr) comprising a first end that is electrically connected to the second end of the inductor, and a second end connected to the bias voltage and the second end of the optical shutter; an inductor (Lr) comprising a first end electrically connected to the first end of the optical shutter and a second end; and a capacitor (Cr) comprising a first end that is electrically connected to the second end of the inductor, and a second end connected to the bias voltage and the second end of the optical shutter; and wherein the energy supplementer is further configured to supply energy to the capacitor via the inductor when energy is exchanged between the capacitor and the equivalent capacitor of the optical shutter.