Image-sensing devices and methods of operating the same

摘要

In a method of operating an image sensor, a noise voltage of a floating diffusion region is sampled after a reset voltage is applied to the floating diffusion region. A storage region, in which a photo-charge is stored, is electrically connected to the floating diffusion region after sampling the noise voltage, and a demodulation voltage of the floating diffusion region is sampled after the storage region and the floating diffusion region are electrically-connected. A voltage is determined based on the noise voltage and the demodulation voltage.

主权项

1. A method of operating a photo-sensing device including at least one depth pixel, the method comprising:
illuminating an object with modulated transmission light; storing a photo-charge in a storage region of the at least one depth pixel in response to a demodulation signal, the photo-charge being generated in a photo-detection region of the at least one depth pixel by light reflected by the object; sampling a noise voltage of a floating diffusion region of the at least one depth pixel after a reset voltage is applied to the floating diffusion region and before sampling a demodulation voltage of the floating diffusion region; electrically-connecting the storage region and the floating diffusion region after sampling the noise voltage; sampling the demodulation voltage of the floating diffusion region after electrically-connecting the storage region and the floating diffusion region; and determining a voltage corresponding to a phase of the demodulation signal based on the noise voltage and the demodulation voltage.