Imaging device and method of controlling the same

An imaging device, comprising:

• a light source including at least one light emitting device and a light source driver for driving the light emitting device;
• a pixel array in which a plurality of pixels are disposed, each of the plurality pixels including a photodiode for generating electrical charges in response to a light reception signal output by the light source and reflected from a subject, and a pixel circuit for outputting a pixel signal corresponding to the electrical charges of the photodiode;
• and
• a logic circuit including a control logic configured to generate raw data for generating a depth image by obtaining the pixel signals, and to output a light control signal having a predetermined demodulation frequency and a duty ratio, and including a delay circuit configured to output a delay signal to the light source driver by delaying the light control signal,
• wherein the logic circuit is configured to input, to the pixel circuit connected to the photodiode in each of the plurality of pixels, a plurality of photo control signals having different phase differences with reference to the light control signal.

A method of controlling an imaging device including a light source and an image sensor, the method comprising:

• setting a duty ratio of a light control signal for driving the light source as a first reference duty ratio;
• obtaining first operation errors corresponding to a difference between reference data according to a delay time of the light control signal and depth data generated by the image sensor, while changing the delay time of the light control signal;
• calculating a first result value corresponding to a difference between a maximum value and a minimum value among the first operation errors when the delay time of the light control signal reaches a maximum delay time;
• setting a duty ratio of the light control signal as a second reference duty ratio;
• obtaining second operation errors corresponding to a difference between reference data according to the delay time of the light control signal and depth data generated by the image sensor, while changing the delay time of the light control signal;
• calculating a second result value corresponding to a difference between a maximum value and a minimum value among the second operation errors when the delay time of the light control signal reaches a maximum delay time;
• and
• determining the first reference duty ratio or the second reference duty ratio as a duty ratio of the light control signal, based on the first result value and the second result value.